 METHOD AND APPARATUS FOR USING CHANNEL STATE INFORMATION REFERENCE SIGNAL IN WIRELESS COMMUNICATION
专利摘要:
Method and Equipment for Using Channel Status Information Reference Signal in Wireless Communication System There is disclosed a method for wireless communication that includes selecting a first resource pattern comprising resource elements that are not co-located with a second feature pattern and allocate the first feature pattern to a plurality of antennas for transmitting a channel state information reference signal. 公开号:BR112012007824B1 申请号:R112012007824-0 申请日:2010-10-08 公开日:2021-07-20 发明作者:Amir Farajidana；Alexei Yurievitch Gorokhov；Juan Montojo；Kapil Bhattad 申请人:Qualcomm Incorporated； IPC主号:
专利说明:
FUNDAMENTALS I. Technical Field [001] The present disclosure relates generally to communications and more specifically to techniques for transmitting a reference signal in a wireless communication system. II. Fundamentals [002] Wireless communication systems are widely used to provide various communication contents, such as voice, video, packet data, message exchange, broadcasting, etc. These wireless systems can be multiple access systems capable of supporting multiple users by sharing available system resources. Examples of such multiple access systems include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, FDMA Orthogonal (OFDMA) systems and Single Carrier FDMA (SC-FDMA) systems. [003] In wireless communication systems such as Version 8 and Version 9 of the Long Term Evolution (LTE) standard (referred to as Rel-8 and Rel-9), signal transmissions are defined for transmission configurations up to four antennas. With a greater demand for support for higher data rates and transmission capacity (system capacity), wireless systems with a higher number (eight, for example) of transmit antennas have recently attracted attention. To accommodate the increased number of transmit antennas and also to improve system performance, certain additional reference signal transmissions have been proposed, such as, for example, channel state (or spatial) information reference signal (CSI-RS ). [004] However, the introduction of such new reference signals raises problems related to the available transmission bandwidth and the coexistence with legacy reference signals (Rel-8 and Rel-9, for example). Furthermore, the introduction of new reference signals raises the problem of backward compatibility with user equipment not designed to work with the new reference signals. [005] A better method and system to implement the channel state information reference signal are needed. summary [006] The disclosed drawings meet the needs discussed above, among others, of using new reference signals, such as CSI-RS, in a wireless communication system. [007] The following is a simplified summary in order to obtain a basic understanding of some aspects of the revealed objects. This summary is not an extensive panoramic view and is neither intended to identify key or critical elements of the claimed object nor to delineate the scope of such objects. Its purpose is to present some concepts of the features described in a simplified form as an introduction to the more detailed description that is presented later. [008] In one aspect, a method for wireless communication is disclosed. The method includes selecting a first feature pattern comprising feature elements, the first feature pattern being not co-located with a second feature pattern, and allocating the first feature pattern to a plurality of antennas to transmit a reference signal. of channel state information (CSI-RS). [009] In another aspect, there is disclosed an apparatus for wireless communication comprising means for selecting a first feature pattern comprising feature elements, the first feature pattern being not co-located with a second feature pattern, and means to allocate the first resource pattern to a plurality of antennas to transmit a channel state information reference signal (CSI-RS). [0010] In another aspect, an apparatus for wireless communication is disclosed that includes a processor configured to select a first resource pattern comprising resource elements, the first resource pattern being not co-located with a second resource pattern, and allocating the first resource pattern to a plurality of antennas to transmit a channel state information reference signal (CSI-RS). [0011] In another aspect, a computer program product is disclosed which includes a computer readable storage medium comprising instructions for causing at least one computer to select a first feature pattern comprising feature elements, the first pattern of resource being not co-located with a second resource pattern, and instructions to cause the at least one computer to allocate the first resource pattern to a plurality of antennas to transmit a channel state information reference (CSI) signal. -LOL). [0012] In another aspect, a method for wireless communication is disclosed. The method comprises coordinating, with a base station of a neighboring cell, a resource pattern allocated for transmission of the reference signal and muffling, based on the coordination, one or more locations of the resource pattern. [0013] In another aspect, an apparatus for wireless communication is disclosed which comprises means for coordinating, with a base station of a neighboring cell, a resource pattern allocated for the transmission of the reference signal and means for muffling the sound, with based on coordination, of the resource pattern in locations that match the resource pattern allocated in the neighboring cell. [0014] In another aspect, there is disclosed a method for wireless communication comprising receiving a first resource pattern comprising resource elements that are not co-located with a second resource pattern, receiving a state information reference signal (CSI-RS) according to the first feature standard and perform a channel quality estimate based on the channel state information reference signal. [0015] In another aspect, an apparatus for wireless communication is disclosed comprising means for receiving a first resource pattern comprising groups of resource elements that are not co-located with a second resource pattern, means for receiving a signal channel state information reference (CSI-RS) according to the first feature standard and means for performing a channel quality estimate based on the channel state information reference signal. [0016] In another aspect, there is disclosed a computer program product comprising a non-volatile computer readable medium comprising instructions for causing at least one computer to receive a first resource pattern comprising groups of resource elements that are not co-located with a second resource pattern, instructions to cause the at least one computer to receive a channel state information reference signal (CSI-RS) in accordance with the first resource pattern, and instructions to do with that the at least one computer make a channel quality estimate based on the channel state information reference signal. [0017] In another aspect, an apparatus for wireless communication is disclosed that includes a processor configured to store instructions for receiving a first resource pattern comprising groups of resource elements that are not co-located with a second resource pattern, receiving a channel state information reference signal (CSI-RS) in accordance with the first feature standard and performing a channel quality estimate based on the channel state information reference signal. [0018] Several aspects and features of the disclosure are described in more detail below. Brief Description of Drawings [0019] The features, nature and advantages of the present disclosure will become more evident from the detailed description presented below when considered in conjunction with the drawings, in which the same references identify the same elements throughout and in which: [0020] Figure 1 shows an exemplary wireless communication system. [0021] Figure 2 shows an exemplary transmission structure. [0022] Figure 3 shows a resource allocation pattern for a normal cyclic prefix (CP) subframe. [0023] Figure 4 shows a resource allocation pattern for a subframe with extended CP. [0024] Figure 5 shows another resource allocation pattern for a subframe with normal CP. [0025] Figure 6 shows yet another resource allocation pattern for a subframe with normal CP. [0026] Figure 7 shows another resource allocation pattern for a subframe with extended CP. [0027] Figure 8 shows yet another resource allocation pattern for a subframe with normal CP. [0028] Figure 9 shows yet another resource allocation pattern for a subframe with normal CP. [0029] Figure 10 shows a process for wireless communication [0030] Figure 11 shows an apparatus for wireless communication [0031] Figure 12 shows another process for wireless communication [0032] Figure 13 shows a base station apparatus for wireless communication. [0033] Figure 14 shows yet another process for wireless communication. [0034] Figure 15 shows a user equipment apparatus for wireless communication. [0035] Figure 16 shows a transmission apparatus for wireless communication. Detailed Description [0036] Several aspects are now described with reference to the drawings. In the following description, for purposes of explanation, numerous specific details are presented in order to obtain a complete understanding of one or more aspects. It may be evident, however, that the various aspects can be put into practice without these specific details. In other cases, well-known structures and devices are shown in block diagram form in order to facilitate the description of these aspects. [0037] The techniques described herein can be used in various wireless communication systems, such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA and other systems. The terms “system” and “network” are often used interchangeably. A CDMA system can implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Broadband CDMA (W-CDMA) and other CDMA variants. CDMA2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA system can implement a radio technology such as the Global System for Mobile Communications (GSM). An OFDMA system can implement a radio technology such as Evolved UTRA (E-UTRA), Mobile Ultra-Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, or Flash-OFDM®, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). Long Term Evolution (LTE) and LTE-Advanced (LTE-A) of 3GPP are new versions of UMTS that use E-UTRA, which uses OFDMA in the downlink and SC-FDMA in the uplink. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization called the “3rd Generation Partnership Project” (3GPP). CDMA2000 and UMB are described in documents from an organization called “3rd Generation Partnership Project 2” (3GPP2). The techniques described herein can be used in the systems and radio technologies mentioned above as well as in other systems and radio technologies. For clarity, certain aspects of the techniques are described below for LTE, and LTE terminology is used throughout much of the following description. [0038] PHY DL channels may include: Physical Downlink Shared Channel (PDSCH), Physical Broadcast Channel (PBSH), Physical Multicast Channel (PMCH), Physical Downlink Control Channel (PDCCH), Indicator Channel Physical Hybrid Automatic Repeat Request (PHICH) and Physical Control Format Indicator Channel (PCFICH). [0039] PHY UL channels may include: Physical Random Access Channel (PRACH), Physical Uplink Shared Channel (PUSCH) and Physical Uplink Control Channel (PUCCH). [0040] Although several designs are discussed below with reference to the CSI-RS, it should be understood that the CSI-RS is just one example of an additional reference signal that can be introduced into a wireless communication system. Therefore, the considerations and drawings presented below are applicable also to other known or future reference signs. [0041] In previous versions of the LTE specification, a single reference signal was defined for measuring channel quality and for data demodulation. LTE-A has defined two forms of reference signal for demodulation and channel quality measurement: the demodulation reference signal (DM-RS) and the channel state information reference signal (CSI-RS). A base station (eNodeB or eNB) can schedule and transmit these reference signals to UEs. UEs can use the CSI-RS to perform channel quality measurements and provide feedback on channel quality or spatial properties. Several properties of the CSI-RS are revealed in more detail below, including allocation of transmission resources, backward compatibility with previously used UEs, and coordination with CSI-RS transmissions in neighboring cells. [0042] Figure 1 shows a wireless communication system 100, which can be an LTE system or some other system. System 100 may include a number of evolved Node Bs (eNBs) 110 and other network entities. An eNB 110 may be an entity that communicates with the UEs and may be referred to as a base station, Node B, access point, etc. Each eNB 110 can provide communication coverage for a specific geographic area and can support communication for UEs located within the coverage area. To improve capacity, the total coverage area of an eNB can be partitioned into several (three, for example) smaller areas. Each smaller area can be served by a respective eNB subsystem. In 3GPP, the term "cell" can refer to the smallest coverage area of an eNB and/or an eNB subsystem that serves this coverage area. [0043] UEs 120 can be dispersed throughout the system, and each UE 120 can be stationary or mobile. A UE 120 may also be referred to as a mobile station, terminal, access terminal, subscriber unit, station, etc. A UE 120 can be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop station (WLL), a smart phone, a netbook, a smartbook, etc. [0044] LTE uses orthogonal frequency division multiplexing (OFDM) on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM partition a frequency range into several (K) orthogonal subcarriers, which are also commonly referred to as tones, binaries, etc. Each sub-carrier can be modulated with data. In general, modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM. The spacing between adjacent sub-carriers can be fixed, and the total number of sub-carriers (K) can depend on the system bandwidth. For example, K can equal 128, 256, 512, 1024, or 2048 for the system bandwidth of 1.25, 2.5, 5, 10, or 20 mega-Hertz (MHz), respectively. The system bandwidth can correspond to a subset of the total K sub-carriers. [0045] Figure 2 shows a transmission structure 200 for the downlink in LTE. The transmission timeline can be partitioned into subframe units. Each subframe can have a predetermined duration, such as one millisecond (ms) and can be partitioned into multiple partitions (two partitions, for example). Each partition can cover seven OFDM symbol periods for a normal cyclic prefix (shown along axis 204 of Figure 2) or six symbol periods for an extended cyclic prefix (not shown in Figure 2). Multiple blocks of streaming resources can be defined for each partition. Each resource block can cover 12 sub-carriers (shown along vertical axis 202) in a partition. The number of resource blocks in each partition can depend on the system bandwidth and can range in the range from 6 to 110 for a system bandwidth of 1.25 MHz to 20 MHz, respectively. Available resource blocks can be assigned to multiple downlink transmissions. For the extended cyclic prefix (not shown in Figure 2), the two partitions in a subframe can include 12 symbol periods with indices from 0 to 11. [0046] In some drawings, a resource element (RE) 206 may be a transmission resource unit scheduled for downlink transmission. In some drawings, an RE 206 may correspond to a downlink transmission symbol (or codeword). The REs 206 made available for downlink transmission of a specific signal can form a “pattern” when shown along a two-dimensional grid, such as that shown in Figure 2. The assignment of REs for transmission of a signal can therefore be referred to as the transmission pattern of that signal. Furthermore, the term "location of an RE" may refer to the time (OFDM symbol) and frequency (sub-carrier) associated with one of the REs within a subframe or block of resources, or it may refer to informally to the position of the RE 206 in a two-dimensional representation of available transmission resources in a subframe or a block of resources, as shown in Figure 2, for example. [0047] It may be necessary that the transmission overhead associated with the CSI-RS offset the performance of both LTE-A and legacy LTE. In order to allocate transmission resources, such as REs 206, for CSI-RS transmission, an eNB 110 can trade-off between the effectiveness of the CSI-RS in improving channel performance and the impact of reduced availability of transmission resources for data traffic. In particular, the CSI-RS may puncture or withdraw transmission resources from data transmission to the legacy UEs 120. Therefore, increasing CSI-RS overhead can deteriorate performance or data throughput for legacy UEs 120. Therefore, CSI-RS transmissions can be transmitted frequently (between 2 and 10 milliseconds, for example) and covering a sufficient frequency range (the bandwidth of the entire channel, for example) in order to obtain an estimation performance of channel suitable for single cell and multiple different cell transmission schemes. [0048] In some designs, the problem of transmission resources can be solved by controlling the density of REs 206 allocated for CSI-RS transmissions. The term “density” here refers to the measure of how many of the available transmission resources (tones, time slices or codes, for example) are allocated for CSI-RS transmission. In some designs, the density of transmission resources can be controlled by limiting the number of REs 206 allocated for CSI-RS transmission in a resource block (RB). In some designs, the density of transmission resources can be controlled by adjusting the duty cycle of CSI-RS transmissions. The term “duty cycle” refers to the frequency of CSI-RS transmissions. For example, a 2 millisecond (ms) duty cycle might mean that the CSI-RS is transmitted once every 2 ms. In some designs, the density of transmission resources can be controlled by limiting the number of subframes that comprise CSI-RS transmissions. These and other aspects of CSI-RS transmission resource density control are described in more detail below. [0049] A study has shown that CSI-RS with frequency density of 2RE/RB and a duty cycle of 10 ms can provide reasonable LTE-A performance for single-user MIMO (SU-MIMO). Some studies have suggested that densities higher than 2RE/RB per antenna port can result in a significant loss of UE performance, especially for a modulation and coding scheme (MCS) with high coding rate. In some designs, a scheduler in the eNB 110 can reduce the performance loss impact for the legacy UEs 120 by taking into account the loss in rate prediction performance of the scheduled UE 120 based on the CSI-RS transmit density. In some designs, the eNB 110 can program the legacy UEs 120 with the requested MCS at lower encoding rates. In some designs, the eNB 110, in order to prevent CSI-RS transmissions from impacting the legacy UE 120, can only schedule LTE-A users in the subframes in which the CSI-RS is transmitted. In some designs, a frequency density of 2RE/RB per antenna port can be a reasonable trade-off between performance and overhead. In other designs, a fixed density of 1 RE/RB may be a reasonable trade-off. The number of REs/RBs per antenna port allocated to the CSI-RS can be a predetermined, fixed number. Note that a fixed quota of RE per RB simply implies the allocation of a certain number of REs in the RB in which a CSI-RS transmission is scheduled and may not mean that each RB scheduled by the eNB 110 includes these many REs for transmissions. CSI-RS. [0050] As will be discussed below, in some designs a specific density number can be mapped to a specific frequency offset between allocated UEs. In certain drawings shown below, for example, a density of 2 RBs/RE may correspond to a frequency offset of 6 sub-carriers between the REs 206 of the CSI-RS. It can be understood that this offset is similar to the offset between common (or cell-specific) reference signals (CRS) Rel- 8. In certain designs, the existence of a offset between sub-carriers similar to CRS may make it possible to leverage a CRS demodulation structure in a receiver to demodulate the CSI-RS. [0051] In some designs, the CSI-RS duty cycle can be (semi) statically configurable for a limited set of values, such as 2.5 or 10 ms. The operational value of the duty cycle can be signaled to an LTE-A UE 120 via an information block on a broadcast channel. In some designs, a different duty cycle may be specified for each antenna port. In some designs, the same duty cycle value can be set for all antenna ports defined in a cell. Using the same duty cycle value can reduce the signaling overhead and computational complexity associated with programming and using different duty cycle values simultaneously for different antenna ports. [0052] Figure 3 shows a normal CP subframe 300, with axis 302 representing transmitted symbols (time) and axis 304 representing frequency. As discussed earlier, each "juxtaposition" of subframe 300 can therefore represent a single RE 206 available for transmission. In some designs, a transmission on an RE 206 may also be code division multiplexed with another transmission on the same RE 206. [0053] In LTE systems, certain REs 206 were allocated for transmission of control signals (control region, for example) at the beginning of each sub-frame. In Figure 3, the REs 206 that correspond to these allocated REs 206 are marked with shading. Although the control region is shown as spanning 3 OFDM symbols in the present example, it is to be understood that the control region can span a different number of OFDM symbols in other examples. In addition, certain REs 206 are allocated to a Common (or Cell-Specific) Reference Signal (CRS). The CRS is shifted into positions based on the identity of the eNB 110 of a specific cell, in RBs. In Figure 3, juxtapositions marked “C” represent REs 206 that can be used for CRS transmission. In addition, REs 206 allocated for transmission of demodulation reference signals (DM-RSs) (also referred to as UE-specific reference signals or UE-RSs) in LTE Version 9 are marked as "D". In some designs, REs 206 so allocated to other control and reference signals may not be allocated to the CSI-RS. Those skilled in the art would understand that the allocation of REs 206 for transmitting a given control or reference signal may not mean that the control/reference signal is present in each programmed RB, but simply mean that when the control/reference signal is broadcast, it will be broadcast in one or more of the allocated RE locations. Therefore, in certain designs, only RE regions marked 306, 308, 310, 312, 314, and 316 may be available for CSI-RS transmission. In certain designs, since CRSs are transmitted with a cell-dependent shift, an entire OFDM symbol (marked with shading) in which a CRS is presented can be bypassed for CSI-RS transmission. This helps prevent the CSI-RS from colliding with the CRS of neighboring cells in a synchronous network. [0054] Figure 4 shows an extended CP subframe 400, showing REs 206 assigned to DM-RS and CRS, marked with “D” and “C”, respectively. As discussed above, REs 206 in regions 402, 404, 406, 408, 410, 414, 416, 418, and 420 may be available for CSI-RS transmission. The RES 206 DM-RS shown in Figure 4 may correspond to the DM-RS REs for classification 2 in Version 9 of LTE. In general, other DM-RS locations are also possible. Note that the DM-RS density shown for the normal CP subframe 300 (Figure 3) is 24 RE/RB and is 32 RE/RB for the extended CP subframe 400. In these drawings, the maximum number of REs 206 available for CSI-RS transmission can therefore be 60 and 40 RE/RB for normal and extended CP subframes, respectively. [0055] Referring to Figure 5, a subframe 500 is shown which includes REs 206 allocated to yet another reference signal. Certain designs can further avoid collision of the CSI-RS with symbols that can be used for the downlink reference (DRS) signal Rel-8 (also referred to as UE-specific reference signal or UE-RS), shown. as juxtapositions “R” in Figure 5. DRS signals are transmitted in TDD mode and the locations (REs 206 used) for DRS depend on the cell ID. In such drawings, the number of REs 206 available for CSI-RS can then be reduced to 24 REs, shown as regions 502, 504, 506, 508, and 510 in sub-frame 500 of Figure 5. Alternatively, in some others In designs, only REs 206 used by DRS during an actual allocation/transmission can be deleted instead of deleting the entire RE location. In other words, the CSI-RS standard for each cell can be initialized so as not to overlap with the DRS standard for that specific cell. [0056] From Figures 3, 4 and 5, it can be seen that, in drawings that avoid co-location with patterns used for other reference signals and legacy reference signals, the number of REs 206 available for the CSI- RS can be limited to a smaller subset. In some designs, REs 206 allocated for CSI-RS transmissions from a specific antenna port may be allocated among all available RE 3206 locations so as to obtain an even spread of transmissions from the specific antenna port across the frequency range. The uniform distance restriction may also limit the total number of REs 206 available for CSI-RS transmissions from all antenna ports. In designs where the CSI-RS is uniformly spread across the frequency range, the demodulation of the CSI-RS can be simplified, as discussed above. In addition, using uniformly spaced REs 206 for CSI-RS transmission can provide more accurate channel quality estimation across the entire frequency range. In some designs, REs 206 allocated to the CSI-RS that correspond to a specific antenna port may be evenly spaced in frequency. Thus, in certain designs, for the CSI-RS gate of a cell sub-carriers can be allocated evenly spaced apart in a given symbol. [0057] In certain drawings, the REs 206 allocated to the DM-RS can be excluded from the CSI-RS (as shown in Figures 3 and 4, for example). As discussed earlier, this can also reduce the number of REs available for CSI-RS transmissions. In subframe 300, for example, the number of REs 206 available for CSI-RS can be reduced to 36. In order to remedy the reduction of REs 206 available for CSI-RS transmissions, in some designs that exclude DM symbols -RS, the number of CRS antenna ports can be limited to 2. By limiting the number of CRS antenna ports to 2, OFDM symbol containing CRS for antenna ports 2 and 3 can be used in CSI transmissions -LOL. This CRS reallocation can increase the number of available CSI-RS symbols to 48 in a normal subframe. [0058] Referring now to Figures 6 and 7, in particular, the above property can also provide a uniform structure for CSI-RS for extended CP and normal CP subframes. For a design that uses 2RE/RB allocation for CSI-RS, it is possible to group the available 206 REs into groups of 206 REs (in pairs, as shown in Figures 6 and 7, for example). Each pair includes two REs 206 on the same RB with the same frequency offset (frequency offset of 6 sub-carriers in Figures 6 and 7, for example). Figure 6, for example, shows a pairing of REs 206, as shown in Figure 3. The REs 206 with the same numbers in Figure 6 can form a pair and can be 6 sub-carriers apart from each other and also with respect to the REs 206 matches in an adjacent RB (not shown in Figure 6). In other words, when contiguous RBs are assigned to CSI-RS broadcasts, the pattern of allocation of REs 206 can be uniform not only within an RB, but also across multiple RBs as well (ie, uniformity along the horizontal geometric axes and vertical in Figure 6). As can be seen in Figure 6, pairs of 206 REs are possible with a frequency offset of 6, with 52 REs of 60 REs available shown in Figure 3 that are used for the CSI-RS. It should be understood that if 1 RE/RB per port is assigned to the CSI-RS, each RE 206 available in Figure 6 (total of 60 REs 206) can be assigned a unique number from 1 to 60 and each RE 206 can be available for assignment to an antenna port. [0059] Figure 7 shows another pairing example in which 20 pairs of REs are formed using all 40 available REs shown in Figure 4 for an extended CP subframe. In certain designs, each pair of REs can be used for one CSI-RS per RB antenna port. [0060] It should be understood that while a given cell may need a limited number of REs 206 for CSI-RS transmissions (an 8-antenna configuration needs 8 assignments, one per antenna port, for example), the REs 206 The available REs shown in Figure 6 or 7 may be shared between neighboring cells so that the neighboring cell eNBs 110 do not use the same REs 206. Referring to Figure 6, for example, an eNB 110 may use REs 206 numbered 1 through 8, while a neighboring eNB 110 may use REs 206 numbered 9 to 16 in CSI transmissions. Therefore, neighboring cells are able to avoid CSI-RS collisions by coordinating allocation of REs between eNBs 110. [0061] Figure 8 shows an exemplary subframe 800 in which four pairs of REs 802, 804, 806 and 808 can be assigned to CSI-RS antenna ports. The pairs of REs 802, 804, 806 and 808 can be chosen to have uniform spacing across both frequency and time. The uniform assignment, shown in subframe 800, can help to avoid disproportionate "bundling" of REs 206, overloading the transmissions of legacy UEs 120 in some subframes. This can ensure that the CSI-RS punctures all code blocks substantially equally for legacy UEs 120 that are programmed with more than one code block. [0062] In some designs, the assigned locations of RE pairs for CSI-RS may be cell dependent and may be initialized as a function of the physical cell ID and the number of CSI-RS antenna ports. In certain drawings, therefore, OFDM symbols with REs 206 available for CSI-RS can be partitioned into two sets: a first set having the first partition of a subframe and the other group having the second partition of the subframe . In certain designs, in order to reduce the impact on data traffic of legacy UEs 120, the CSI-RS pattern initialization procedure can ensure that OFDM symbols used in CSI-RS transmissions alternate between the two partitions of the OFDM symbols or, equivalently, two partitions, as described above. [0063] Referring now to Figure 9, an exemplary resource assignment for a normal subframe 900 is shown. In the exemplary sub-frame 900 shown, the CSI-RS locations of a given antenna port may occupy sub-carriers uniformly spaced apart from each other in different OFDM symbols. The REs 206 available for CSI-RS transmission are numbered from 1 to 12. For a desired frequency offset (6 in this example, for example), two REs 206 that have the desired uniform offset (6 in this example, for example) can be assigned to the CSI-RS. For example, any RE 206 numbered 1 can be paired with any RE 206 numbered 7 and represents the transmit locations of a CSI-RS antenna port. Four pairs of REs 902, 904, 906, and 908 are shown in the normal subframe 900. Pairs 902, 904, 906, and 908 are uniformly spaced apart along the horizontal (time) and vertical (frequency) geometric axes302 , 304. [0064] Still referring to Figure 9, it can be understood that the CSI-RS antenna ports can be mapped into different reserved RE 206 locations (cross-shaded juxtapositions in Figure 9) through different resource blocks since the sub-carrier spacing between the REs 206 used for each CSI-RS antenna port is uniform with the required frequency spacing. In certain drawings, a different mapping across different resource blocks and/or subframes can be used to provide the same number of CSI-RS antenna port REs 206 for all antenna ports within each OFDM symbol with the power boosting purpose for the reference signal. [0065] In certain designs, the CSI-RS may be transmitted in multiple subframes within a given frame (as opposed to transmission in a single subframe). In such designs, the CSI-RS for different antenna ports of the same cell or the CSI-RS through different cells can be transmitted in different subframes. In one aspect, the CSI-RS collision rate across different cells can be probabilistically reduced. In addition, the eNB 110 may have more flexibility in placing and defaulting the REs 206 allocated to the CSI-RS. For example, when a transmission is organized as frames comprising 10 subframes numbered 0 through 9, in certain drawings, CSI-RS transmissions may occur only in subframe No. 0. In other drawings, CSI-transmissions RS can be programmed in more subframes - as, for example, in subframes 0 and 1. [0066] However, using multiple subframes for CSI-RS transmission may require compensation due to the possible impact on the performance of legacy UEs 120. For example, removing REs 206 from many subframes can puncture the data region of legacy UEs 120 into several subframes, resulting in a loss of system performance. Some designs may, therefore, limit the impact of puncturing the data region of the legacy UEs 120 to a predetermined number of CSI-RS bearer subframes, so that the eNB 110 can schedule data transmission around these subframes programming only 120 LTE-A UEs in these subframes or programming legacy UEs 120 with a lower rate in these subframes. [0067] In addition, limiting CSI-RS transmission to a predetermined number of subframes can also allow better battery life management in UEs 120. For example, if CSI-RSs of different antenna ports in one cell or multiple cells are transmitted in subframes 1 and 6, then a UE 120 may have to wake up twice within a frame in order to receive and process CSI-RS transmissions. However, if all CSI-RSs are transmitted in subframe 1, then a UE 120 may only have to wake up for one subframe, avoiding having to wake up frequently to measure the CSI-RS of several different cells or antenna ports in different sub-frames. [0068] In certain designs, therefore, CSI-RS transmission may be restricted to a limited number of subframes, referred to as CSI-RS subframes. The number of CSI-RS subframes can be selected based on the desired CSI-RS collision rate across different cells. For example, restricting CSI-RS transmissions from all cells to the same subframe can result in a higher collision probability, but can help to improve the battery performance of UEs 120, as discussed above. In certain drawings, the subframes that include PBCH, signals or sync alert within a radio frame of the set of CSI-RS subframes, i.e., the {0, 4, 5, 9} subframes in FDD mode, they can be excluded from carrying CSI-RS, in order to avoid interference with these control signals. [0069] In certain drawings, when the number of CSI-RS subframes is greater than 1, the CSI-RS subframes used by neighboring eNBs 110 can be coordinated to be contiguous (subframe numbers 0 and 1, for example), allowing a UE 120 to measure CSI-RS signals from different eNBs 110 in a single wake-up cycle. Furthermore, CSI-RS transmissions from different eNBs 110 can be coordinated so that the number of contiguous subframes used can be limited to as small a number as possible. For example, if CSI-RS resources are available on a subframe in which another eNB is transmitting its CSI-RS, then a second eNB 110 can perform its CSI-RS transmissions on the same subframe instead of selecting another subframe for your CSI-RS transmissions. [0070] In certain designs, CSI-RS transmissions from different antenna ports of the same cell can be orthogonally multiplexed. Referring to Figure 8, for example, both the RE with index 11 in region 804 and the neighbor RE with index 10 can be used for CSI-RS transmission from two antenna ports (1 and 2). However, these two transmissions can be code division multiplexed so that they are orthogonal to each other. [0071] As previously described with respect to Figure 11, multiple eNBs 110 may be present in wireless communication system 100. In certain drawings, the various eNBs 110 may coordinate with each other the CSI-RS transmissions within each respective cell . Coordination can include two operations: “sound muffling” and “jumping”, as also described below. [0072] The pattern of REs 206 allocated for CSI-RS transmissions in a cell can be skipped, or changed, in order to randomize the occurrence of CSI-RS signals across different cells, in order to reduce the collision rate . In collision situations of dominant interfering cells, hops can advantageously avoid interference from the dominant eNB 110. For example, when there is no jump, if the CSI-RS of a cell collides with the CSI-RS of an interfering agent once, it can always collide, making it impossible for a UE 120 to obtain accurate CSI measurements from the CSI-RS . However, if the patterns are jumping, it is quite likely that they do not collide at times, which gives the opportunity for the UE 120 to reliably estimate the CSIs using the CSI-RS of the weaker cells. In various designs, hop patterns can be chosen as a function of system time, antenna gate index, physical cell ID, or a combination of these parameters. In some drawings, for example, each CSI-RS port can be assigned a frequency offset, a symbol index of the available symbol set, and a subframe index of the CSI-RS subframe set. When 2 REs/RBs per antenna port are assigned for CSI-RS transmission in each subframe, the CSI-RS port can be assigned to a different RE pair as a random function of the above parameters. [0073] In one drawing, the assignment of an antenna port to an index of pair of REs (from 1 to 26, as shown in Figure 5, for example) can be performed by randomly choosing from 1 to 26 in each sub -frame in which a CSI-RS broadcast may be present. The subframe containing CSI-RS can be chosen randomly. Random jumps can be generated by a pseudo-random sequence generator that takes into account the physical cell ID, system time, and possibly the antenna gate index. In certain designs, the jump function or pseudorandom sequence may be chosen so as to preserve orthogonality across CSI-RS antenna ports of the same cell. [0074] A skip pattern can also be advantageously to obtain a higher granularity in the frequency domain for channel estimation. This can be especially true for low speed users or in cases where the configured duty cycle is low (ie CSI-RSs are transmitted with large time intervals). For example, without a skip pattern, frequency resolution improvement can take a higher CSI-RS density in the frequency for CSI-RS transmission that covers the desired frequency range. With the use of a skip pattern, however, the eNB 110 can assign a pattern that ensures wide frequency domain sampling (with different offset) for any antenna port. Consequently, although the frequency resolution by appearance in time is low, the various appearances in frequency obtained over time can improve the effective frequency resolution. [0075] In certain drawings, a skip pattern can be defined to perform randomization (or orthogonalization) not only through the REs 206 within a subframe, but also through the REs 206 of all subframes of CSI-RS collectively. For example, if the RE locations allocated to a specific CSI-RS antenna port are represented as a function of three parameters: subframe number (SFN), time and frequency, then all three of these parameters can be skipped in. of its set of possible values. This hop, or randomization, can help to randomize RE allocations when the size of the CSI-RS subframe set is large. [0076] In certain examples, the assigned pattern of REs of CSI-RS 206 can be skipped through subframes. In other words, for each cell, the subframe(s) containing CSI-RS transmissions can be skipped within the set of CSI-RS subframes over time. For example, consider the set of CSI-RS subframes {1,2} within a radioframe and assume that the CSI-RS periodicity is 10 ms. Then, in every 10ms period, the CSI-RS locations for a specific port and a specific cell may be present in one of subframes 1 or 2. In some designs, the allocated subframe (ie, 1 or 2) may not change over time. For example, CSI-RS locations for port x, cellID y may always be present in subframe index 1. In other designs, the subframe assigned to CSI-RS for port x, cellID y may be jumped (or randomly chosen) every 10 ms between all possible values of index or subframe number (1 or 2 in this example). The subframe number hop can be a function of cell ID, antenna port and set of CSI-RS subframes or system time. [0077] The subframe skip approach can help to reduce the collisions of intercellular CSI-RS transmissions. For example, when all CSI-RSs for all antenna ports of a cell in a duty cycle are present in a subframe chosen from the set of CSI-RS subframes and the index of this subframe is bounced over time depending on the cell ID, among other parameters (number of CSI-RS antenna ports, number of CSI-RS subframes and system time, for example), so the collision rate can be reduced since CSI-RS from different cells may be present in different subframes over time. In some designs, the impact on legacy UEs 10 may be further limited to a minimum number of subframes, as discussed above, by restricting the total number of subframes used in CSI-RS transmissions. Furthermore, the computation complexity of the feedback computation can also be reduced by limiting the total number of subframes of CSI-RS transmissions, as mentioned above. [0078] In some designs, two levels of jump from the CSI-RS standard may be used. One level may correspond to the hop of the frequency/time/code allocation for REs 206 within a subframe, and the other level may correspond to the hop of the subframe indices for which a CSI-RS transmission of a port and/or specific cell may be present. This multilevel jump can help avoid collisions between CSI-RS transmissions of different antenna port rates across different cells. [0079] In some designs, the jump mode can be disabled or enabled semi-static or dynamically. The UE 120 can be informed of the CSI-RS hopping mode by higher layer signaling, through a broadcast or unicast channel and/or within a Layer 2 signaling. [0080] In certain designs, the choice of enabling/disabling the jump mode and the selection of locations that each cell will use in CSI-RS transmissions may depend, for example, on the transmission mode, the number of users and their quality channel and capabilities. For example, if a joint transmission in a multi-cell configuration is used in one cell, the network can coordinate (by communication between the eNBs 110) the jump mode and locations of a subset of cells. In one design, when eNBs 110 coordinate the CSI-RS resources used, skipping can be disabled. It should be understood that each level of the two-level jump as described above can be disabled independently of the other level. For example, it is possible to consider disabling subframe index hop in a disjointed manner from hop of CSI-RS locations within a subframe. In one design, for example, subframe index hopping can be disabled so that a CSI-RS transmission can be performed only on subframe 1 in each radio frame, but CSI-local hopping can be done. RS can be allowed within subframe 1 over a period of time. [0081] In certain drawings, one or more parameters referring to the jump program (such as time occurrences in which the jump is turned on/off or a new CSI-RS standard will be used and so on) can be signaled from an eNB 110 to a UE 120. The hop scheduling parameters can help the UE 120 to identify the hop schedule for CSI-RS transmission. [0082] In some designs, the available CSI-RS locations for each cell may be limited to a subset of all available CSI-RS locations (shown in Figure 5, for example). This subset can be different for different cells and can change over time. Furthermore, the eNBs 110 can coordinate with each other, in a higher layer (layer 3, for example), the subset of REs within a subframe used by each eNB 110. [0083] Certain designs, such as designs that use CSI-RS in multi-point transmission (CoMP) configurations, can perform “sound muffling” in CSI-RS transmissions. For example, a cell's eNB 110 may not perform transmissions at RE locations 206 assigned to CSI-RS transmissions in a neighboring cell. It is possible to improve the CSI-RS channel estimation performance or, equivalently, reduce the overhead for a given performance by performing this mute operation. Because of the muting of the sound of other signals that can potentially interfere with a given cell's CSI-RS transmissions, the estimation of channel state information from non-serving cells or weaker serving cells can be significantly improved. Necessary information (RE sites, for example) for puncturing (muting) traffic can be signaled between eNBs 110. In addition, UEs 120 within a cell can be informed of data muting by eNB 110 in order to make UEs 120 aware that data is not being transmitted for those UEs 120 and to avoid potential interference of data transmissions with CSI-RS transmissions of another cell. [0084] Figure 10 shows a process 1000 for wireless communication. In operation 1002, a first feature pattern comprising feature elements is selected. The first feature pattern may comprise, for example, possible RE locations as described in Figures 3 to 7. In certain drawings, feature elements may be uniformly spaced apart from each other. The first feature pattern is not co-located with a second feature pattern. The second resource pattern may, for example, comprise RE locations allocated to other reference signals, such as CRS and DM-RS (or UE-RS). In operation 1004, the first resource pattern is allocated to a plurality of antennas for transmitting a channel state information reference signal (CSI-RS). Allocation may be carried out, for example, as described with respect to Figures 8 and 9. Process 1000 may also include one or more of the RE allocation techniques discussed in this disclosure. [0085] Figure 11 shows an apparatus 1100 for wireless communication. Apparatus 1100 includes a module 1102 for selecting a first feature pattern comprising feature elements, the first feature pattern being non-co-located with a second feature pattern and a module 1104 for allocating the first feature pattern to a plurality antennas for transmitting a channel state information reference signal (CSI-RS). In certain drawings, the first feature pattern may comprise feature elements evenly spaced apart. The first resource pattern may comprise, for example, possible RE locations as described in Figures 3 to 7. The second resource pattern may, for example, comprise RE locations allocated to other reference signals such as CRS and DM-RS (or UE-RS). Allocation may be effected, for example, as described with respect to Figures 8 and 9. Apparatus 1100 may also include modules for implementing one or more of the designs discussed in this disclosure. [0086] Figure 12 shows a wireless communication process 1202 to allocate resources for a transmission of a reference signal, implemented in an eNB. In operation 1204, a resource pattern allocated for transmitting the reference signal is coordinated with a base station of a neighboring cell. Coordination may include, for example, the muffle or jump operation described above. In operation 1206, the resource pattern at locations that match the resource pattern allocated in the neighboring cell are muffled based on coordination. Process 1200 can also include one or more of the techniques discussed in this disclosure. [0087] Figure 13 shows a base station apparatus 1300 for wireless communication. Apparatus 1300 includes a module 1302 for coordinating, with a base station of a neighboring cell, a resource pattern allocated for transmission of the reference signal and a module 1304 for muffling the sound, based on coordination, of the resource pattern at locations that match the resource pattern allocated in the neighboring cell. Coordination can include, for example, the muffle or jump operation described above. Apparatus 1300 may also include modules for implementing one or more of the designs discussed in this disclosure. [0088] Figure 14 shows a wireless communication process 1400, implemented in a UE. In operation 1402, a first feature pattern is received which comprises feature elements that are not co-located with a second feature pattern. In operation 1404, a channel state information reference signal (CSI-RS) in accordance with the first feature standard is received. In operation 1406, a channel quality estimate is performed based on the channel state information reference signal. Process 1400 can also include one or more of the techniques discussed in this disclosure. [0089] Figure 15 shows a user equipment apparatus 1500 for wireless communication. Apparatus 1500 comprises a module 1502 for receiving a first resource pattern comprising groups of resource elements that are not co-located with a second resource pattern, a module 1504 for receiving a channel status information reference signal. CSI-RS) according to the first feature standard and a module 1506 for performing a channel quality estimation based on the channel state information reference signal. Apparatus 1300 may also include modules for implementing one or more of the designs discussed in this disclosure. [0090] Figure 16 shows a block diagram of a drawing of an exemplary base station/eNB 110 and a UE 120, which can be one of the eNBs and one of the UEs of Figure 1, where the various processes disclosed above can be implemented as appropriate. UE 120 can be equipped with T antennas 1234a to 1234t, and base station 110 can be equipped with R antennas 1252a to 1252r, where in general T > 1 and R > 1. [0091] At UE 120, a transmission processor 1220 can receive data from a data source 1212 and control information from a controller/processor 1240. The transmission processor 1220 can process (encode, interleave and map into symbols, for example ) data and control information and can generate data symbols and control symbols, respectively. Transmission processor 1220 may also generate one or more demodulation reference signals for several non-contiguous clusters based on one or more sequences of RSs assigned to UE 120 and may generate reference symbols. A transmission (TX) 1230 multi-input, multi-output (MIMO) processor 1230 may perform spatial processing (precoding) on the data symbols, control symbols and/or reference symbols of the transmission processor 1220, if applicable. , and can send T output symbol streams to T modulators (MODs) 1232a to 1232t. Each modulator 1232 can process a respective stream of output symbols (such as for SC-FDMA, OFDM, etc.) so as to obtain an output sample stream. Each modulator 1232 can also process (analog convert, amplify, filter and upconvert, for example) the output sample stream so as to obtain an uplink signal. T uplink signals from modulators 1232a to 1232t can be transmitted via T antennas 1234a to 1234t, respectively. [0092] At base station 110, antennas 1252a to 1252r can receive uplink signals from UE 120 and send received signals to demodulators (DEMODs) 1254a to 1254r, respectively. Each demodulator 1254 can condition (filter, amplify, downconvert and digitize, for example) a respective received signal so as to obtain received samples. Each demodulator 1254 may also process received samples to obtain received symbols. A MIMO channel processor/detector 1256 can obtain symbols received from all R demodulators 1254a through 1254r. Channel processor 1256 can derive a channel estimate for a wireless channel from UE 120 to base station 110 based on demodulation reference signals received from UE 120. MIMO detector 1256 can perform MIMO detection/demodulation on received symbols based on channel estimation and can generate detected symbols. A receive processor 1258 can process (symbol demap, deinterleave and decode, for example) the detected symbols, send decoded data to a data store 1260, and send decoded control information to a controller/processor 1280. [0093] On the downlink, at base station 110, data from a data source 1262 and control information from controller/processor 1280 can be processed by a transmission processor 1264, precoded by a MIMO TX processor 1266 se applicable, conditioned by modulators 1254a to 1254r and transmitted to UE 120. At UE 120, downlink signals from base station 110 may be received by antennas 1234, conditioned by demodulators 1232, processed by a channel estimator/MIMO detector 1236 and also processed by a receive processor 1238 to obtain the data and control information sent to the UE 120. The processor 1238 can send the decoded data to a data store 1239 and the decoded control information to the controller/processor 1240. [0094] Controllers/processors 1240 and 1280 can guide operation at UE 120 and base station 110, respectively. Processor 1220, processor 1240 and/or other processors and modules in UE 120 can perform or drive process 1400 of Figure 14 and/or other processes and modules in base station 110 can run or drive process 1202 of Figure 12 and/ or other processes for the techniques described herein. Memories 1242 and 1282 can store data and program codes for UE 120 and base station 110, respectively. A scheduler 1284 can schedule UEs for downlink and/or uplink transmission and can provide resource allocations (such as, allocations of several non-contiguous clusters, sequences of RSs for demodulation reference signals, etc.) to the programmed UEs. [0095] It should be understood that various properties of CSI-RS transmissions are disclosed herein. In certain designs, the CSI-RS pattern (i.e., the pattern of REs within a subframe assigned to the transmission of the CSI-RS signal) may be cell-specific. The pattern of CSI-RS transmissions can depend on the number of antenna ports, the physical cell ID of the specific cell, and so on. In certain designs, the transmission overhead associated with the CSI-RS can be controlled by selecting an appropriate transmission duty cycle. In certain designs, the transmission overhead associated with the CSI-RS can be controlled by limiting the number of REs assigned by RBs to CSI-RS transmissions. [0096] It should also be understood that various techniques are disclosed to limit the impact of CSI-RS transmissions on legacy equipment. In certain designs, for example, CSI-RS transmissions through different cells can be limited to a small number of subframes, thus reducing the impact on the wake-up time of a UE 120 and on puncturing traffic. data for the 120 legacy UEs. In certain designs, the CSI-RS is not transmitted in a subframe of a radio frame that transmits an alert, or a PBCH, or a sync signal. [0097] It should also be understood that the disclosed drawings allow for an effective implementation of the CSI-RS structure. In some designs, for example, the number of CSI-RS ports is statically configured. In some designs, the CSI-RS duty cycle can be configured semi-statically from a limited set of values, such as {2, 5, 10} ms. [0098] It should also be understood that techniques are disclosed to enable orthogonal transmission of CSI-RS. In some designs, the CSI-RS of an antenna port of a cell can be uniformly offset in frequency by one OFDM symbol with a frequency offset of a fixed number (6, for example) of sub-carriers. [0099] In certain designs, the CSI-RS pattern of different antenna ports from different cells can jump in time. Hops can be a function of physical cell ID, antenna port index, and system time. [00100] In certain designs, data transmissions/control signals may be muffled at locations used by CSI-RS transmissions from neighboring cells. In some designs, sound muffling can be performed based on coordination between multiple eNBs 110. [00101] It is to be understood that the CSI-RS designs disclosed herein can be used with any mode of transmission, such as single-cell and MU-MIMO and multi-cell coordinate transmission. [00102] It is to be understood that the CSI-RS designs discussed herein may be embodied to include one or more of the following aspects, among other aspects disclosed herein: (1) The CSI-RS of a cell may avoid that CRS REs cell. (2) The CSI-RS can entirely avoid CRS symbols so as to avoid collision with the CRS of neighboring cell(s). (3) The CSI-RS can avoid EU-specific RS REs (UE-RS). It should be noted that UE-specific RS REs refer to any UEs that can be used for UE-RS and may not always be used for UE-RS. (4) CSI-RS can bypass UE-RS of one LTE version but not another. For example, certain designs may avoid Rel 9/10 UE-RS, but not Rel 8 UE-RS. (5) The CSI-RS patterns may be chosen to avoid UE-RS REs of any cell. (6) The CSI-RS standards for a cell can be chosen to avoid UE-RS REs for that cell alone. Since Rel 8 UE-RS standard is different for different cell IDs, it can affect the number of available CSI-RS standards and their signaling. (7) The CSI-RS standard can be chosen to be a function of one or more of the cell ID, the number of CSI-RS antenna ports, and the type of subframe in which the CSI-RS is transmitted . (8) The CSI-RS standard can be chosen so as to avoid symbols and/or subframes that contain Synchronization, PBCH or Alert Signals. (9) CSI-RSs from different antenna ports of the same cells can be orthogonally multiplexed. (10) CSI-RSs from different cells can be multiplexed orthogonally to each other. (11) Neighboring cell CSI-RSs can be muffled in order to avoid collision/interference. (12) Sound muffling can be signaled to UEs in order to avoid transmissions in transmission facilities with muffled sound. (13) CSI-RS standards can be skipped via subframes. (14) The jump pattern can be used selectively and the enabling or disabling of jumps can be signaled to the user equipment. [00103] Those skilled in the art would understand that information and signals can be represented using any of several different technologies and techniques. For example, the data, instructions, commands, information, signals, bits, symbols and chips referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination their. [00104] Those skilled in the art would also understand that the various illustrative logical blocks, modules, circuits and algorithm steps described in connection with the present disclosure may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various components, blocks, modules, circuits, and illustrative steps have been described generically above in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and design limitations imposed on the system as a whole. Those skilled in the art can implement the described functionality in a variety of ways for each specific application, but such implementation decisions should not be construed as departing from the scope of the present disclosure. [00105] The various illustrative logic blocks, modules and circuits described in connection with the present disclosure may be implemented or executed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an array of field-programmable gates (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor can be a microprocessor, but alternatively the processor can be any conventional processor, controller, microcontroller, or state machine. A processor can also be implemented as a combination of computing devices, such as, for example, a combination of DSP and microprocessor, a plurality of microprocessors, one or more microprocessors together with a DSP core, or any other such configuration. [00106] The steps of a method or algorithm described in connection with the present disclosure may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from, and write information to, the storage medium. Alternatively, the storage medium can be integral with the processor. The processor and storage medium can reside on an ASIC. The ASIC can reside on a user terminal. Alternatively, the processor and storage medium can reside as discrete components on a user terminal. [00107] In one or more exemplary drawings, the functions described may be implemented in hardware, software, firmware or any combination of them. If implemented in software, functions can be stored in or transmitted via one or more instructions or code in a computer-readable medium. Computer-readable media include both computer storage media and communication media that include any media that facilitates the transfer of a computer program from one place to another. A storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer. By way of example, and not limitation, such computer readable medium may comprise RAM, ROM, EEPROM, CD-ROM or any other optical disk storage, magnetic disk storage or other magnetic storage apparatus or any other medium that may be used to carry or store desired program code devices in the form of instructions or data structures and which can be accessed by a general purpose or special purpose computer. The term disc (disk and disc in the original), as used herein, includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disc and Blu-ray disc, in which usually discs (disks ) reproduce data magnetically, while discs (discs) reproduce data optically with lasers. Combinations of them should also be included within the scope of computer readable media. [00108] The foregoing description of the disclosure is presented to enable any person skilled in the art to manufacture or use the disclosure. Various modifications in the disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the invention. Thus, the disclosure is not intended to be limited to the examples and drawings described herein, but should be given the widest scope compatible with the unpublished principles and aspects disclosed herein. [00109] In view of the exemplary systems described above, methodologies that can be implemented according to the revealed object were described, with reference to various flow diagrams. Although, for simplicity, the methodologies are shown and described as a plurality of blocks, it should be understood that the claimed object is not limited by the order of the blocks, since some blocks may occur in orders different from the one shown and described here and/or concurrently with other blocks. Furthermore, it is not necessary that all blocks shown implement the methodologies described here. It should also be understood that the methodologies described herein may be stored in an industrial product to facilitate the conduct and transfer of such methodologies to computers. The term industrial product, as used herein, is intended to encompass a computer program accessible from any computer-readable device, carrier, or medium. [00110] It is to be understood that any patent, publication or other disclosure material, in whole or in part, which is purportedly incorporated herein by reference, is incorporated herein only to the extent that the incorporated material does not conflict with definitions , existing statements, or with other disclosure material presented in this disclosure. Therefore, and to the extent necessary, the disclosure explicitly set forth herein supersedes any conflicting material incorporated herein by way of reference. Any material, or any part thereof, which is purportedly incorporated herein by reference, but which conflicts with existing definitions, statements or other disclosure material presented herein, will only be incorporated to the extent that no conflict arises between such incorporated material. and the existing development material.
权利要求:
Claims (14) [0001] 1. A method for wireless communication, comprising: selecting a subframe for a first feature pattern that does not collide with subframes including a sync signal, an alert signal and/or a broadcast signal; and allocating (1004) the first resource pattern to a plurality of antennas for transmitting a channel state information reference signal (CSI-RS); and the method characterized in that it further comprises selectively skipping the first resource pattern, wherein the skipping pattern is chosen as a function of system time, antenna gate index and physical cell ID. [0002] 2. Method according to claim 1, characterized in that the first resource pattern comprises resource elements not allocated to resources of a second resource pattern comprising transmission resources allocated, in one or more cells, to one or more between a user equipment reference signal, a common reference signal, and a control signal. [0003] 3. Method according to claim 1, characterized in that it further comprises limiting CSI-RS transmissions from the plurality of antennas to a predetermined number of subframes. [0004] 4. Method according to claim 1, characterized in that the first resource pattern comprises resource elements not allocated resources of a second resource pattern comprising a transmission resource pattern allocated in another cell. [0005] 5. Method according to claim 1, characterized in that allocating the first resource pattern comprises: grouping the first resource pattern into a plurality of resource element groups; and assigning a group of resource elements to an antenna among the plurality of antennas. [0006] 6. Method according to claim 1, characterized in that allocating comprises allocating a predetermined number of evenly spaced resource elements for each antenna among the plurality of antennas. [0007] 7. Method according to claim 1, characterized in that the first resource pattern comprises resource elements not allocated to resources of a second resource pattern comprising transmission resources allocated to a common reference signal in another cell. [0008] 8. Method according to claim 1, characterized in that the first feature pattern is selected based on one or more among a cell identification, a number of the plurality of antennas and a subframe index for transmission of the CSI-RS. [0009] 9. Apparatus for wireless communication, comprising: means for selecting a subframe for a first resource pattern that does not collide with subframes including a synchronization signal, an alert signal and/or a broadcast signal; and means (1104) for allocating the first resource pattern to a plurality of antennas for transmitting a channel state information reference signal (CSI-RS); and the apparatus characterized in that it further comprises means for selectively skipping the first resource pattern, wherein the skipping pattern is chosen as a function of system time, antenna gate index and physical cell ID. [0010] 10. A method for wireless communication, comprising: receiving a subframe comprising a first resource pattern that does not collide with subframes including a sync signal, an alert signal and/or a broadcast signal; receiving (1404) a channel state information reference signal (CSI-RS) in accordance with the first feature standard; and performing (1406) a channel quality estimate based on the CSI-RS, the method characterized by the fact that the first resource pattern is selectively skipped and where the skip pattern is chosen as a function of system time, antenna port index and physical cell ID. [0011] 11. Method according to claim 10, characterized in that the subframe further comprises a second resource pattern comprising resources allocated to a user equipment reference signal and/or a common reference signal, the first resource pattern having resource elements not allocated to the resources of the second resource pattern. [0012] 12. Method according to claim 10, characterized in that it further comprises reporting the channel quality estimate to a base station. [0013] 13. Apparatus for wireless communication, comprising: means for receiving a subframe comprising a first resource pattern that does not collide with subframes including a synchronization signal, an alert signal and/or a broadcast signal; means (1504) for receiving a channel state information reference signal (CSI-RS) in accordance with the first feature standard; and means (1506) for performing a channel quality estimate based on the CSI-RS, the apparatus characterized by the fact that the first resource pattern is selectively skipped and the skip pattern is chosen as a function of the time of system, antenna port index, and physical cell ID. [0014] 14. Computer-readable memory, characterized in that it contains recorded thereon the method as defined in any one of claims 1 to 8 or 10 to 12.
类似技术:
公开号 | 公开日 | 专利标题 US10771218B2|2020-09-08|Method and apparatus for using channel state information reference signal in wireless communication system US9871636B2|2018-01-16|Enhanced control channel element | based physical downlink shared channel | resource allocation for long-term evolution | EP2781133B1|2017-11-08|Downlink control information for low cost devices EP2989739B1|2019-01-16|Pdsch transmission schemes with compact downlink control information | format in new carrier type | in lte US20170104567A1|2017-04-13|Sounding reference signal enhancements for wireless communication JP6304516B2|2018-04-04|Enhanced physical downlink control channel coverage for machine-type communications EP2797371B1|2019-07-03|Method, system and apparatus for flexibly changing the amount of allocated e-pdcch resources US9276710B2|2016-03-01|Method and apparatus for resource allocation with carrier extension KR20180028502A|2018-03-16|The reference signal in the communication network RU2714130C1|2020-02-12|Methods for adaptation of density of reference signals of demodulation BR112012030448B1|2021-11-16|REFERENCE SIGNAL PATTERNS BR112012025059B1|2021-09-21|METHOD AND EQUIPMENT FOR WIRELESS COMMUNICATION AS WELL AS COMPUTER-READABLE MEMORY BR112012017413B1|2021-12-14|CHANNEL FEEDBACK BASED ON REFERENCE SIGNAL BR112012025059A2|2020-08-11|silencing schemes for reference signal of channel status information and signaling thereof BR112012012743B1|2021-11-23|IMPROVEMENT OF SOUND REFERENCE SIGNAL FOR WIRELESS COMMUNICATION BR112012019842B1|2021-11-03|APERIODIC SOUND REFERENCE SIGNAL TRANSMISSION METHOD AND APPARATUS
同族专利:
公开号 | 公开日 WO2011044530A2|2011-04-14| EP2486691B1|2019-03-06| CN105553632A|2016-05-04| KR101433286B1|2014-08-22| KR20120090083A|2012-08-16| EP3515008A1|2019-07-24| US20110244877A1|2011-10-06| US10771218B2|2020-09-08| BR112012007824A2|2016-03-08| US20190280839A1|2019-09-12| CN102549963B|2016-01-13| JP2019036985A|2019-03-07| JP6665072B2|2020-03-13| EP2486691A2|2012-08-15| CN102549963A|2012-07-04| TWI489844B|2015-06-21| JP2017076989A|2017-04-20| TW201134169A|2011-10-01| CN105553632B|2020-03-17| JP2015053699A|2015-03-19| JP2019146187A|2019-08-29| JP6918760B2|2021-08-11| WO2011044530A3|2011-06-30| JP2013507846A|2013-03-04|
引用文献:
公开号 | 申请日 | 公开日 | 申请人 | 专利标题 US6096668A|1997-09-15|2000-08-01|Kimberly-Clark Worldwide, Inc.|Elastic film laminates| US8000284B2|2003-07-15|2011-08-16|Qualcomm Incorporated|Cooperative autonomous and scheduled resource allocation for a distributed communication system| KR100678182B1|2003-08-20|2007-02-02|삼성전자주식회사|Method and apparatus for uplink packet data service in asynchronous wcdma system| WO2005062636A1|2003-12-22|2005-07-07|Telefonaktiebolaget Lm Ericsson |Arrangements and method for handling macro diversity in utran transport network| US20060153312A1|2005-01-07|2006-07-13|Samsung Electronics Co., Ltd.|Apparatus and method for space-time frequency block coding in a wireless communication system| MY140921A|2005-04-26|2010-02-12|Nokia Corp|Method, system, apparatus and software product for combination of uplink dedicated physical control channel gating and enhanced uplink dedicated channel to improve capacity| KR20060115293A|2005-05-04|2006-11-08|삼성전자주식회사|Configuration and managing apparatus and method of channel in ofdma system and transmitting/receiving method and apparatus thereof| JP4869724B2|2005-06-14|2012-02-08|株式会社エヌ・ティ・ティ・ドコモ|Transmission device, transmission method, reception device, and reception method| GB0600814D0|2006-01-17|2006-02-22|Siemens Ag|A Method Of Resource Allocation In A Communication System| KR101265632B1|2006-12-12|2013-05-22|엘지전자 주식회사|Method And Apparatus For Transmitting Reference Signal, Setting Reference Signal Transmission Pattern, And Setting And Allocating Resource Block| KR100962037B1|2007-03-14|2010-06-08|이노베이티브 소닉 리미티드|Method and apparatus of configuring a transport block size in a wireless communications system| US8379738B2|2007-03-16|2013-02-19|Samsung Electronics Co., Ltd.|Methods and apparatus to improve performance and enable fast decoding of transmissions with multiple code blocks| KR100913102B1|2007-03-19|2009-08-19|엘지전자 주식회사|A resource allocation Method and a method for transmitting/receiving resource allocation information in mobile communication system| KR100902698B1|2007-07-20|2009-06-15|한국정보통신대학교 산학협력단|Stfbc-ofdm system and its communication method| KR101500729B1|2007-09-24|2015-03-09|엘지전자 주식회사|Method for allocating resource in wireless communication system| US8254429B1|2007-10-02|2012-08-28|Apple Inc.|Communication systems and methods| CN101478365B|2008-01-04|2012-08-29|展讯通信（上海）有限公司|Modulation mode encoding and processing method in TD-SCDMA system HS-SCCH signaling| WO2009096319A1|2008-02-01|2009-08-06|Sharp Kabushiki Kaisha|Transmitter, receiver, transmission method, and reception method| CA2714421C|2008-02-08|2017-09-12|Zte Inc.|Dynamic adjustment of downlink/uplink allocation ratio in tdd wireless systems| US8855257B2|2008-02-11|2014-10-07|Intel Mobile Communications GmbH|Adaptation techniques in MIMO| US8243678B2|2008-03-10|2012-08-14|Motorola Mobility, Inc.|Hierarchical pilot structure in wireless communication systems| US9544776B2|2008-03-25|2017-01-10|Qualcomm Incorporated|Transmission and reception of dedicated reference signals| US8559879B2|2008-04-22|2013-10-15|Qualcomm Incorporated|Null pilots for interference estimation in a wireless communication network| CN101588631B|2008-05-21|2011-05-11|中兴通讯股份有限公司|Method for controlling channel resource allocation| US7907385B2|2008-07-14|2011-03-15|GM Global Technology Operations LLC|Low inductance interconnect device for a power capacitor component| US8259825B2|2008-08-08|2012-09-04|Motorola Mobility, Inc.|Mapping and signaling of common reference symbols for multiple antennas| EP2342934B1|2008-09-19|2016-08-31|BlackBerry Limited|Semi-persistent scheduling in wireless network| CN105227284B|2008-09-26|2019-03-22|三星电子株式会社|For receiving and dispatching the method and apparatus of reference signal in a wireless communication system| KR101611272B1|2008-11-07|2016-04-11|엘지전자 주식회사|Method for transmitting a reference signal| KR101619446B1|2008-12-02|2016-05-10|엘지전자 주식회사|Reference signal transmission method for downlink multiple input multiple output system| KR20100088554A|2009-01-30|2010-08-09|엘지전자 주식회사|Method and apparatus of receiving and transmitting signal in wireless communication system| CN101505180B|2009-03-17|2013-12-04|中兴通讯股份有限公司|CSI reference signal bearing method and apparatus in long term evolution system| US8274951B2|2009-03-17|2012-09-25|Samsung Electronics Co., Ltd.|System and method for dynamic cell selection and resource mapping for CoMP joint transmission| US8811314B2|2009-03-18|2014-08-19|Lg Electronics Inc.|Method and apparatus for transmitting reference signal in wireless communication system| KR101593702B1|2009-03-22|2016-02-15|엘지전자 주식회사|Method and apparatus for reference signal in wireless communication system| US8279825B2|2009-04-10|2012-10-02|Lg Electronics Inc.|Method for transmitting channel state information in a wireless communication system| KR101715397B1|2009-04-22|2017-03-13|엘지전자 주식회사|Apparatus and method for transmitting reference signal in wireless communication system| WO2010128831A2|2009-05-08|2010-11-11|엘지전자 주식회사|Data transmission/reception method and apparatus using a transmission diversity technique in a wireless communication system| US9048976B2|2009-06-22|2015-06-02|Lg Electronics Inc.|Apparatus and method for transmitting reference signals in wireless communication system| CN102474745B|2009-06-30|2015-07-08|瑞典爱立信有限公司|Controlling CSI reporting in a LTE cellular communication network| KR101237666B1|2009-07-28|2013-02-26|엘지전자 주식회사|Method and apparatus of transmitting reference signal for reducing inter-cell interference in multiple input multiple output communication system| KR101710204B1|2009-07-28|2017-03-08|엘지전자 주식회사|Method and apparatus of transmitting reference signal for channel measurement in multiple input multiple output communication system| EP3709555A1|2009-08-14|2020-09-16|LG Electronics Inc.|Method and apparatus for transmitting downlink reference signal in wireless communication system that supports multiple antennas| WO2011028078A2|2009-09-07|2011-03-10|엘지전자 주식회사|Channel status information feedback method and apparatus in wireless communication system with relay station| US8953642B2|2009-09-15|2015-02-10|Lg Electronics Inc.|Method and apparatus for transmitting a downlink reference signal in a wireless communication system supporting multiple antennas| CA2775479C|2009-09-27|2017-02-28|Lg Electronics Inc.|Method and apparatus for transmitting reference signal in wireless communication system| US9444589B2|2009-10-05|2016-09-13|Qualcomm Incorporated|Method and apparatus for puncturing data regions for signals to minimize data loss| US20110244877A1|2009-10-08|2011-10-06|Qualcomm Incorporated|Method and apparatus for using channel state information reference signal in wireless communication system| US10193678B2|2009-10-08|2019-01-29|Qualcomm Incorporated|Muting schemes for channel state information reference signal and signaling thereof| US8755365B2|2009-11-08|2014-06-17|Lg Electronics Inc.|Method and a base station for transmitting a CSI-RS, and a method and user equipment for receiving the CSI-RS| US8660072B2|2010-01-18|2014-02-25|Telefonaktiebolaget L M Ericsson |Methods and apparatus for improved reference signal correlation characteristics| EP2534857B1|2010-02-12|2019-05-22|BlackBerry Limited|Reference signal for a coordinated multi-point network implementation| US8855240B2|2010-02-12|2014-10-07|Blackberry Limited|Channel estimation and data detection in a wireless communication system in the presence of inter-cell interference| US9407409B2|2010-02-23|2016-08-02|Qualcomm Incorporated|Channel state information reference signals| KR101819502B1|2010-02-23|2018-01-17|엘지전자 주식회사|A method and a user equipment for measuring interference, and a method and a base station for receiving interference information| US20120015541A1|2010-07-15|2012-01-19|Juniper Networks, Inc.|Self-securing power cord| US8750887B2|2010-07-16|2014-06-10|Texas Instruments Incorporated|Multi-cell signaling of channel state information-reference signal and physical downlink shared channel muting| US20120014779A1|2010-07-16|2012-01-19|Charles David Gilliam|Disc pump|JP5649650B2|2009-08-14|2015-01-07|エルジー エレクトロニクス インコーポレイティド|Method and apparatus for transmitting a downlink reference signal in a wireless communication system supporting multiple antennas| EP3709555A1|2009-08-14|2020-09-16|LG Electronics Inc.|Method and apparatus for transmitting downlink reference signal in wireless communication system that supports multiple antennas| US20110244877A1|2009-10-08|2011-10-06|Qualcomm Incorporated|Method and apparatus for using channel state information reference signal in wireless communication system| US10193678B2|2009-10-08|2019-01-29|Qualcomm Incorporated|Muting schemes for channel state information reference signal and signaling thereof| KR20110038994A|2009-10-09|2011-04-15|삼성전자주식회사|Method of receiving and transmitting multi-user control channels in wireless communication system with multiple antennas and apparatus thereof| DK2496005T3|2009-10-30|2018-09-17|Sun Patent Trust|WIRELESS COMMUNICATION DEVICE AND PROCEDURE FOR GENERATING REFERENCE SIGNAL| US8755365B2|2009-11-08|2014-06-17|Lg Electronics Inc.|Method and a base station for transmitting a CSI-RS, and a method and user equipment for receiving the CSI-RS| US8824384B2|2009-12-14|2014-09-02|Samsung Electronics Co., Ltd.|Systems and methods for transmitting channel quality information in wireless communication systems| EP2517491A4|2009-12-25|2016-06-01|Nokia Solutions & Networks Oy|Mapping reference signal for multi-cell transmission| KR101731836B1|2009-12-30|2017-05-02|삼성전자주식회사|Method and system for reporting channel state information in wireless communication systems| JP5230663B2|2010-01-05|2013-07-10|株式会社エヌ・ティ・ティ・ドコモ|Radio base station apparatus, mobile terminal apparatus and radio communication method| JP2011142437A|2010-01-06|2011-07-21|Ntt Docomo Inc|Radio base station device, mobile terminal device, and radio communication method| KR101754970B1|2010-01-12|2017-07-06|삼성전자주식회사|DEVICE AND METHOD FOR COMMUNCATING CSI-RS IN WIRELESS COMMUNICATION SYSTEM| KR101053635B1|2010-01-28|2011-08-03|엘지전자 주식회사|Method for transmitting control signal to relay node at base station in mimo communication system and apparatus therefor| JP5081257B2|2010-02-04|2012-11-28|株式会社エヌ・ティ・ティ・ドコモ|Radio communication system, radio base station apparatus, and communication control method| WO2011096646A2|2010-02-07|2011-08-11|Lg Electronics Inc.|Method and apparatus for transmitting downlink reference signal in wireless communication system supporting multiple antennas| KR101241916B1|2010-02-07|2013-03-11|엘지전자 주식회사|A method for transmitting downlink reference signal in multi-carrier supporting wireless communication system and an apparatus for the same| EP2534857B1|2010-02-12|2019-05-22|BlackBerry Limited|Reference signal for a coordinated multi-point network implementation| EP2534778B1|2010-02-12|2021-06-02|BlackBerry Limited|Reference signal for a coordinated multi-point network implementation| US8305987B2|2010-02-12|2012-11-06|Research In Motion Limited|Reference signal for a coordinated multi-point network implementation| US9407409B2|2010-02-23|2016-08-02|Qualcomm Incorporated|Channel state information reference signals| KR101498079B1|2010-03-04|2015-03-03|엘지전자 주식회사|Apparatus of transmitting and receiving signal in distributed antenna system| KR101835328B1|2010-03-17|2018-04-19|엘지전자 주식회사|Method and apparatus for providing channel state information-reference signalconfiguration information in a wireless communication system supporting multiple antennas| KR101253197B1|2010-03-26|2013-04-10|엘지전자 주식회사|Method and base station for receiving reference signal, and method and user equipment for receiving reference signal| CN102263723B|2010-05-31|2013-09-25|中国移动通信集团公司|Downstream channel measure reference signal sending method, apparatus thereof, downstream channel measure reference signal receiving method, and apparatus thereof| JP5373706B2|2010-06-21|2013-12-18|株式会社エヌ・ティ・ティ・ドコモ|Base station apparatus, mobile terminal apparatus and communication control method| US8750887B2|2010-07-16|2014-06-10|Texas Instruments Incorporated|Multi-cell signaling of channel state information-reference signal and physical downlink shared channel muting| KR101671287B1|2010-08-13|2016-11-01|삼성전자 주식회사|Method and apparatus for transmission and reception reference signal in wireless communication system| EP2603990B1|2010-08-13|2019-10-02|LG Electronics Inc.|Method and base station for transmitting downlink signal and method and equipment for receiving downlink signal| JP4938117B2|2010-08-16|2012-05-23|株式会社エヌ・ティ・ティ・ドコモ|Signaling method, base station apparatus, mobile terminal apparatus and radio communication system| US8891438B2|2010-09-08|2014-11-18|Intel Corporation|Packet-data network and methods for RAN-agnostic multimedia content distribution| CN102404055B|2010-09-10|2014-06-18|电信科学技术研究院|Method, system and device for measuring interference| WO2012074346A1|2010-12-03|2012-06-07|Samsung Electronics Co., Ltd.|Method and apparatus for reference signaling allocation and channel estimation in distributed antenna systems| US20130315197A1|2010-12-14|2013-11-28|Lg Electronics Inc.|Method for transmitting and method for receiving a channel state information reference signal in a distributed multi-node system| US8964663B2|2011-01-06|2015-02-24|Qualcomm Incorporated|Method and apparatus for signaling paging configurations and channel state information reference signalconfigurations| EP2673892A4|2011-02-07|2016-09-14|Intel Corp|Co-phasing of transmissions from multiple infrastructure nodes| US9426703B2|2011-02-11|2016-08-23|Qualcomm Incorporated|Cooperation and operation of macro node and remote radio head deployments in heterogeneous networks| US8995400B2|2011-02-11|2015-03-31|Qualcomm Incorporated|Method and apparatus for enabling channel and interference estimations in macro/RRH system| US9544108B2|2011-02-11|2017-01-10|Qualcomm Incorporated|Method and apparatus for enabling channel and interference estimations in macro/RRH system| JP5092026B2|2011-02-14|2012-12-05|株式会社エヌ・ティ・ティ・ドコモ|Base station apparatus, mobile terminal apparatus, and communication control method| US10187859B2|2011-02-14|2019-01-22|Qualcomm Incorporated|Power control and user multiplexing for heterogeneous network coordinated multipoint operations| US9054842B2|2011-02-14|2015-06-09|Qualcomm Incorporated|CRSand CSI-RStransmission for remote radio heads | KR101904944B1|2011-02-22|2018-10-08|엘지전자 주식회사|Method of performing measurement at ue in wireless communication system and apparatus thereof| EP3668136A1|2011-04-18|2020-06-17|Huawei Technologies Co., Ltd.|Method for arranging transmissions on a downlink carrier| WO2012153976A2|2011-05-09|2012-11-15|엘지전자 주식회사|Method for base station transmitting control signal to user equipment in multiple-antenna wireless communication system and apparatus for same| JP5978566B2|2011-07-07|2016-08-24|ソニー株式会社|COMMUNICATION DEVICE, COMMUNICATION METHOD, AND BASE STATION| TW201728104A|2011-08-12|2017-08-01|內數位專利控股公司|Method and apparatus for multiple-input multiple-output operation| JP6031105B2|2011-08-16|2016-11-24|エルジー エレクトロニクス インコーポレイティド|Method and apparatus for multiplexing a downlink control channel by a base station in a wireless communication system| CN103947130B|2011-09-29|2017-06-06|英特尔公司|For the higher order MU MIMO of LTE A| KR101855523B1|2011-10-06|2018-05-04|삼성전자주식회사|Method and device of generating feedback in a communication system| US9144045B2|2011-10-06|2015-09-22|Telefonaktiebolaget L M Ericsson |Time and frequency synchronization| WO2013055126A1|2011-10-11|2013-04-18|엘지전자 주식회사|Method for measuring state of channel quality in wireless communication system including cells formed with a plurality of network nodes, and apparatus therefor| US9014114B2|2011-12-14|2015-04-21|Qualcomm Incorporated|User equipment reference signal-based timing estimation| KR102015124B1|2012-01-11|2019-08-27|삼성전자주식회사|Apparatus and method for transmitting/receiving downlink data in cellular radio communication system| US9819462B2|2012-01-30|2017-11-14|Alcatel Lucent|Method and apparatus for signaling to support flexible reference signal configuration| US9608699B2|2012-03-06|2017-03-28|Lg Electronics Inc.|Method and device for transmitting channel state information in wireless communication system| US9094164B2|2012-04-17|2015-07-28|Qualcomm Incorporated|Methods and apparatus to improve channel estimation in communication systems| US9681425B2|2012-05-11|2017-06-13|Qualcomm Incorporated|Rank-specific feedback for improved MIMO support| CN103688586B|2012-05-11|2017-12-22|华为技术有限公司|Reference signal processing method and user equipment, base station| US9351288B2|2012-06-05|2016-05-24|Samsung Electronics Co., Ltd.|Uplink channel sounding and channel state information estimation in mobile communication systems with multiple antennas| US9420487B2|2012-06-29|2016-08-16|Lg Electronics Inc.|Method for measuring and reporting CSI-RS in wireless communication system, and apparatus for supporting same| US10645599B2|2012-07-02|2020-05-05|Lg Electronics Inc.|Method and device for reporting channel state information in wireless communication system| KR101669710B1|2012-07-05|2016-10-26|주식회사 케이티|Methods of controlling transmission of uplink and apparatuses thereof in Mobile Communication Networks| WO2014007531A1|2012-07-05|2014-01-09|주식회사 케이티|Method for controlling uplink transmission in mobile communication network and apparatus therefor| WO2014010994A1|2012-07-12|2014-01-16|엘지전자 주식회사|Method for transmitting reference signal to antenna port in wireless access system| US9736828B2|2012-07-17|2017-08-15|Telefonaktiebolaget Lm Ericsson |Network node and a method therein for scheduling a downlink data transmission to a UE, and a UE and a method therein for receiving a downlink data transmission| WO2014019182A1|2012-08-01|2014-02-06|华为技术有限公司|Downlink transmission control method, user equipment, and network device| EP2880904B1|2012-08-02|2017-10-25|Telefonaktiebolaget LM Ericsson |Resource allocation and joint transmission| US9184889B2|2012-08-08|2015-11-10|Blackberry Limited|Method and system having reference signal design for new carrier types| US9402256B2|2012-08-08|2016-07-26|Blackberry Limited|Method and system having reference signal design for new carrier types| CN104885514B|2012-11-01|2019-05-21|英特尔公司|The signal of qos requirement and UE power preference is sent in LTE-A network| EP2919541B1|2012-11-16|2018-02-28|Huawei Technologies Co., Ltd.|Access method and device| GB2509840B|2013-01-15|2015-03-25|Zte Wistron Telecom Ab|Operation of a heterogeneous wireless network by determining location of a wireless device| EP3063997B1|2013-12-02|2017-08-30|Huawei Technologies Co., Ltd.|Method and system for muting radio resources in a wireless communication system| CN110545134A|2013-12-20|2019-12-06|北京三星通信技术研究有限公司|Method and device for reporting channel state information| WO2015142110A1|2014-03-20|2015-09-24|엘지전자 주식회사|Method for transmitting d2d signal in wireless communication system and device therefor| KR20150135058A|2014-05-23|2015-12-02|삼성전자주식회사|Method and apparatus for interference cancellation| CN105099967B|2014-05-23|2020-10-23|三星电子株式会社|Apparatus for use in a cellular communication system and method therefor| US9935807B2|2014-09-26|2018-04-03|Telefonaktiebolaget L M Ericsson |Discovery signal design| BR112017012969A2|2014-12-17|2018-02-27|Huawei Technologies Co., Ltd.|One prematch coding method of information gathering and transmission equipment| CN106160940B|2015-04-23|2019-11-19|电信科学技术研究院|A kind of data transmission method and equipment| WO2017080510A1|2015-11-13|2017-05-18|中兴通讯股份有限公司|Information delivery method and device| CN106686620B|2015-11-06|2021-06-22|索尼公司|Wireless communication apparatus and wireless communication method| US9929812B2|2015-12-07|2018-03-27|Qualcomm Incorporated|Techniques for channel estimation using user equipment specific reference signals based on smoothed precoders in a frequency domain| US10090880B2|2015-12-18|2018-10-02|Qualcomm Incorporated|Narrow band PRACH with multiple tone hopping distances| US10511421B2|2016-05-18|2019-12-17|Qualcomm Incorporated|CSI-RS design with dynamic subframe structure| CN111342868B|2016-06-22|2021-06-25|上海朗帛通信技术有限公司|Large-scale MIMO transmission method and device| CN108023849A|2016-11-04|2018-05-11|北京三星通信技术研究有限公司|The method for reporting and device of a kind of channel condition information| KR102315340B1|2017-04-28|2021-10-20|삼성전자주식회사|Apparatus and method for supporting different services in wireless communication system| CN108989003A|2017-06-02|2018-12-11|华为技术有限公司|A kind of method and device of communication| WO2019040061A1|2017-08-23|2019-02-28|Intel Corporation|Methods and apparatus to request non-primary wireless channel utilization| CN109787664A|2017-11-15|2019-05-21|索尼公司|For the electronic equipment of wireless communication system, method, apparatus and storage medium|
法律状态:
2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]| 2020-03-03| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]| 2021-05-18| B09A| Decision: intention to grant [chapter 9.1 patent gazette]| 2021-07-20| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 08/10/2010, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF, QUE DETERMINA A ALTERACAO DO PRAZO DE CONCESSAO. |
优先权:
[返回顶部]
申请号 | 申请日 | 专利标题 US24990609P| true| 2009-10-08|2009-10-08| US61/249,906|2009-10-08| US25718709P| true| 2009-11-02|2009-11-02| US61/257,187|2009-11-02| US12/899,448|2010-10-06| US12/899,448|US20110244877A1|2009-10-08|2010-10-06|Method and apparatus for using channel state information reference signal in wireless communication system| PCT/US2010/052101|WO2011044530A2|2009-10-08|2010-10-08|Method and apparatus for using channel state information reference signal in wireless communication system| 相关专利
Sulfonates, polymers, resist compositions and patterning process
Washing machine
Washing machine
Device for fixture finishing and tension adjusting of membrane
Structure for Equipping Band in a Plane Cathode Ray Tube
Process for preparation of 7 alpha-carboxyl 9, 11-epoxy steroids and intermediates useful therein an
国家/地区
|