 METHOD PERFORMED BY A USER EQUIPMENT AND USER EQUIPMENT APPLIANCE AND METHOD PERFORMED BY A BASE STA
专利摘要:
low reuse preamble. systems and methodologies that facilitate cell search and detection in high interference situations are described. the heterogeneous network may include a plurality of unplanned femto cell implementations, which may prevent macrocells from taking over macrocells. a base station within the network may transmit a low-reuse preamble that includes system information, where the low-reuse preamble is encapsulated in a downlink traffic channel such as the physical downlink shared channel. a u can detect the low reuse preamble and evaluate the preamble to get the system information. 公开号:BR112012000251B1 申请号:R112012000251-1 申请日:2010-07-14 公开日:2021-06-22 发明作者:Ke Liu 申请人:Qualcomm Incorporated； IPC主号:
专利说明:
Fundamentals Field [001] The following description generally refers to wireless communication systems, and more particularly to the facilitation of cell detection in high interference situations by means of a low reuse preamble. Fundamentals [002] Wireless communication systems are widely developed to provide various types of communication content such as voice and data. Typical wireless communication systems may be multiple access systems capable of supporting communication with multiple users by sharing available system resources (eg bandwidth, transmission power, etc.). Examples of such multiple access systems may include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Time Division Multiple Access systems. Orthogonal Frequency Division (OFDMA), and the like. Additionally, systems can conform to specifications such as the 3rd partnership project. generation (3GPP), 3GPP2, High Speed Packet Access (HSPA), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), 3GPP long term evolution (LTE ), Advanced LTE (LTE-A), etc. [003] Generally, wireless multiple access communication systems can simultaneously support communication to multiple mobile devices. Each mobile device communicates with one or more base stations via forward and reverse link transmissions. The forward link (or downlink) refers to the communication link from the base stations to the mobile devices, and the reverse link (or uplink) refers to the communication link from the mobile devices to the base stations. [004] As the demand for multimedia and high-rate data services grows rapidly, there has been an effort towards the implementation of efficient and robust communication systems with improved performance. For example, users have recently begun to replace fixed-line communications with mobile communications and are increasingly demanding greater voice quality, reliable service and lower prices. [005] In addition to the mobile phone networks currently in use, a new class of small base stations has emerged, which can be installed in a user's home and provide indoor wireless coverage for mobile units utilizing existing broadband Internet connections. Such personal miniature base stations are generally known as access point base stations or, alternatively, home Node B (HNB) or femto cells. Typically, such miniature base stations are connected to the Internet and a mobile operator's network through a Digital Subscriber Line (DSL) router, cable modem, or the like. [006] Wireless communication systems can be configured to include a series of wireless access points, which can provide coverage for respective locations within the system. Such a network structure is generally referred to as a cellular network structure, and access points and/or locations that serve respectively in the network are generally referred to as cells. Networks can include femto cells in addition to macro cells that cover large areas. Since the strength of a signal typically decreases as the distance over which it is communicated increases, a network user may, under various circumstances, exchange substantially strong signals with cells located physically close to the user compared to cells that are located closer. away from the user. Accordingly, a macro cell user equipment (UE), in close proximity to a femto cell, may fail to detect, acquire, register with a macro cell base station due to strong interference from the femto cell. summary [007] According to one or more modalities and corresponding description thereof, various aspects are described with respect to facilitating cell search and detection in high interference situations. The heterogeneous network can include a plurality of unplanned femto cell developments, which can impair macrocellular UEs in macro cell acquisition. A base station within the network may transmit a low-reuse preamble that includes the system information, where the low-reuse preamble is tunneled into a downlink traffic channel such as a physical downlink shared channel. A UE can detect the low reuse preamble and evaluate the preamble to get the system information. [008] According to a first aspect, a method is described here and may include detecting a low reuse preamble transmitted by a base station. Additionally, the method may include evaluating the low reuse preamble to identify system information associated with the base station. [009] Another aspect refers to a wireless communication device. The wireless communication apparatus may include a memory that holds instructions related to identifying a low-use preamble transmitted by a base station and evaluating the low-use preamble to identify system information associated with the base station. The wireless communication apparatus may additionally include a processor, coupled to memory, configured to execute instructions retained in memory. [0010] Another aspect refers to equipment that allows the detection of a base station in high interference environments. The equipment may include means for detecting a low reuse preamble transmitted by the base station. The equipment may also include means for analyzing the low reuse preamble to obtain system information associated with the base station. [0011] Yet another aspect relates to a computer program product which may comprise a computer readable medium. The computer-readable medium may include code to cause at least one computer to detect a low-reuse preamble transmitted by a base station. Additionally, the computer readable medium may include a code to cause at least one computer to evaluate the low reuse preamble to identify system information associated with the base station. [0012] According to another aspect, a wireless communication apparatus is described. The wireless communication apparatus may include a processor configured to identify a low-reuse preamble transmitted by a base station, where the low-reuse preamble is transmitted in a traffic channel portion of a subframe. The processor may be further configured to evaluate the low reuse preamble to identify system information associated with the base station. [0013] According to other aspects, a method is described and may include generating a low-reuse preamble that includes system information associated with a base station. The method may also include embedding the low-reuse preamble into a traffic channel portion of a subframe. Additionally, the method may include transmitting the low reuse preamble to at least one mobile device. [0014] Another aspect relates to a wireless communication apparatus comprising a memory. The memory holds instructions related to generating a low-reuse preamble which includes system information associated with a base station, where the low-reuse preamble includes at least one of a synchronization signal, a broadcast channel, or a reference signal. , and embedding the low-reuse preamble in a portion of the subframe traffic channel. The memory further holds the related instructions for transmitting the low reuse preamble to the at least one mobile device. The wireless communication apparatus may also include a memory-coupled processor configured to execute instructions held in memory. [0015] Another aspect relates to an equipment that may include means for generating a low-reuse preamble that includes system information associated with a base station, where the low-reuse preamble includes at least one of a synchronization signal, a channel broadcast, or a reference signal. The equipment may also include means for embedding the low-reuse preamble in a traffic channel portion of a subframe. Additionally, the equipment may include means for transmitting the low reuse preamble to at least one mobile device. [0016] Another additional aspect relates to a computer program product that may comprise a computer-readable medium. The computer readable medium may include code to cause at least one computer to generate a low-reuse preamble that includes system information associated with a base station, where the low-reuse preamble includes at least one of a synchronization signal, a broadcast channel, or a reference signal. The computer-readable medium may also include code to cause at least one computer to identify common control signaling and reference signal symbols in a subframe. Additionally, the computer-readable medium may include code to cause the at least one computer to embed the low-reuse preamble into a subframe traffic channel in an overlapping manner with respect to common control signaling and reference signal symbols. . Additionally, the computer readable medium may include code to cause at least one computer to transmit the low reuse preamble to at least one mobile device. [0017] According to another aspect, a wireless communication apparatus is described. The equipment may include a processor configured to generate a low-reuse preamble that includes system information associated with a base station, where the low-reuse preamble includes at least one of a synchronization signal, a broadcast channel, or a broadcast signal. reference, identifies control signaling and common reference signal symbols in a subframe, incorporates the low-reuse preamble into a traffic channel of the subframe in an overlapping manner with respect to control signaling and common reference signal symbols, and transmit the low reuse preamble for at least one mobile device. Brief Description of Drawings [0018] Figure 1 illustrates an illustrative wireless communication system that facilitates the detection of the base station through a low reuse preamble in high interference situations according to various aspects; [0019] Figure 2 is an illustration of an illustrative resource diagram for a low reuse preamble according to various aspects; [0020] Figure 3 is an illustration of an illustrative resource diagram for a low reuse preamble according to various aspects; [0021] Figure 4 is an illustration of an illustrative system that facilitates the generation and transmission of a low-reuse preamble according to various aspects; [0022] Figure 5 is an illustration of an illustrative system that facilitates the generation of subchannels of a low reuse preamble according to various aspects; [0023] Figure 6 is an illustration of an illustrative system that facilitates the detection of a base station through a low-reuse preamble according to various aspects; [0024] Figure 7 is an illustration of an illustrative methodology for detecting base stations in high interference environments; [0025] Figure 8 is an illustration of an illustrative methodology for employing a low-reuse preamble to facilitate cell search in high interference environments according to various aspects; [0026] Figure 9 is an illustration of an illustrative equipment that facilitates the detection of base stations in high interference environments according to various aspects; [0027] Figure 10 is an illustration of an illustrative equipment that facilitates cell search in high interference environments according to various aspects; [0028] Figures 11 and 12 are block diagrams of respective wireless communication devices that can be used to implement various aspects of the functionality described here; [0029] Figure 13 is an illustration of a wireless communication system according to the various aspects presented here; [0030] Figure 14 is a block diagram illustrating an illustrative wireless communication system in which the various aspects described here can function. Detailed Description [0031] Various embodiments are now described with reference to the drawings, in which similar numerical references are used to refer to similar elements. In the following description, for the purpose of explanation, a number of specific details are presented in order to provide an in-depth understanding of one or more modalities. It may be evident, however, that such modalities can be practiced without these specific details. In other cases, well-known structures and devices are illustrated in block diagram form in order to facilitate the description of one or more modalities. [0032] As used in this application, the terms "component", "module", "system", and the like shall refer to computer-related entities such as: hardware, firmware, a combination of hardware and software, software, or software running. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable element, an execution sequence, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or execution sequence and a component can be located on one computer and/or distributed among two or more computers. Additionally, these components can be executed from various computer readable media having various data structures stored therein. Components can communicate through local and/or remote processes such as, according to a signal, having any one or more data packets (for example, data from one component interacting with another component in a local system, distributor system and /or over a network such as the Internet with other systems via signal). [0033] Additionally, various aspects are described here with respect to a wireless terminal and/or a base station. A wireless terminal can refer to a device providing voice and/or data connectivity to a user. A wireless terminal can be connected to a computing device such as a laptop computer or desktop computer, or it can be a standalone device such as a personal digital assistant (PDA). A wireless terminal may also be called a system, a subscriber unit, a subscriber station, a mobile station, mobile, remote station, access point, remote terminal, access terminal, user terminal, user agent, device user equipment, or user equipment (UE). A wireless terminal can be a subscriber station, wireless device, cell phone, PCS phone, cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local circuit station (WLL), a PDA , a handheld device having wireless capability, or another processing device connected to a wireless modem. A base station (eg, access point, Node B, or evolved Node B (eNB)) can refer to a device on an access network that communicates over the air interface, through one or more sectors, with the wireless terminals. The base station can act as a router between the wireless terminal and the rest of the access network, which can include an Internet Protocol (IP) network, by converting received air interface frames into IP packets. The base station also coordinates attribute management for the air interface. [0034] Furthermore, several functions described here can be implemented in hardware, software, firmware or any combination thereof. If implemented in software, the functions can be stored or transmitted as one or more instructions or code in a computer-readable medium. Computer readable medium includes both computer storage medium and communication medium including any medium that facilitates the transfer of a computer program from one place to another. A storage media can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media may comprise ROM, RAM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage, or other magnetic storage devices, or any other medium that it can be used to carry or store the desired program code in the form of instructions or data structures that can be accessed by a computer. Also, any connection is properly called a computer-readable medium. For example, if the software is transmitted from a web site, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwave are included in the definition of medium. Floppy disk and disc, as used herein, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray disc (BD), where floppy disks typically reproduce data magnetically and discs reproduce data. data optically with lasers. Combinations of the above should also be included in the scope of computer readable media. [0035] Various techniques described herein can be used for various wireless communication systems, such as CDMA, TDMA, FDMA, OFDMA, single-carrier FDMA (SC-FDMA), and other similar systems. The terms "system" and "network" are often used interchangeably. A CDMA system may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), CDMA2000, HSPA, HSDPA, HSUPA, etc. UTRA includes Wideband CDMA (W-CDMA) and other variations of CDMA. Additionally, 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), Ultra Mobile Broadband (UMB), IEEE 802.11 (WiFi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM®, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE 3GPP is a version, eg version 8, which uses E-UTRA, which employs downlink OFDMA and uplink SC-FDMA. HSPA, HSDPA, HSUPA, UTRA, E-UTRA, UMTS, LTE, LTE-A, SAE, EPC and GSM are described in documents from an organization called the "3rd Generation Partnership Project" (3GPP). Additionally, CDMA2000 and UMB are described in documents from an organization called the "3rd Generation 2 Partnership Project" (3GPP2). Additionally, such wireless communication systems may additionally include peer-to-peer ad hoc network systems (eg mobile to mobile) often utilizing unlicensed unpaired spectrum, 802.xx wireless LAN, BLUETOOTH and any other wireless communication technique short or long range. For the sake of clarity, technology associated with WCDMA, HSPA, HSDPA and HSUPA is employed in the description below. However, it should be appreciated that the attached claims should not be limited to WCDMA, HSPA, HSDPA and HSUPA unless explicitly noted. [0036] Furthermore, the term "or" shall mean an inclusive "or" rather than an exclusive "or". That is, unless otherwise specified, or is clear from the context, the phrase "X employs A or B" must mean any natural inclusive permutation. That is, the phrase "X employs A or B" is satisfied by either of the following cases: X employs A; X employs B; or X employs both A and B. Additionally, the articles "a", "an" as used in this application and the appended claims shall generally be taken to mean "one or more" unless the singular form is specified or be clear from the context. [0037] Several aspects will be presented in terms of systems that may include a number of devices, components, modules and the like. It should be understood and appreciated that various systems may include devices, components, additional modules, etc., and/or not include all devices, components, modules, etc. discussed in relation to the figures. A combination of these approaches can also be used. [0038] Referring now to the drawings, Fig. 1 illustrates an illustrative wireless communication system 100 that facilitates base station detection through a low-reuse preamble in high interference situations according to various aspects. Wireless communication system 100 includes a first base station or eNode B (eNB) 120, a second base station or eNB 130, a UE 110. The eNB 120 and the UE 110 can communicate with each other over a link wireless. For example, eNB 120 may transmit information to UE 120 via a downlink channel and UE 110 may transmit information to eNB 120 via an uplink channel. Similarly, UE 110 may also communicate with eNB 130 via respective uplink and/or downlink channels. While, for ease of explanation, only two eNBs (e.g., eNBs 120 and 130) and one UE 110 are illustrated in Figure 1, it should be appreciated that system 100 can include any number of UEs and/or eNBs. Additionally, eNBs 120 and 130 may be referred to as a base station, an access point, an eNode B, an evolved Node B, a Node B, etc. UE 110 may be referred to as a mobile device, a mobile terminal, a mobile station, a station, a wireless terminal or the like. Additionally, it should be appreciated that system 100 can operate on an LTE 3GPP or LTE-A wireless network, a WCDMA wireless network, an OFDMA wireless network, a CDMA network, a CDMA2000 3GPP2 network, an EV-DO network , a WiMAX network, an HSPA network, etc. While aspects described below are explained with respect to an LTE network and/or an LTE radio access technology, it should be appreciated that these techniques described here can be used within the above networks in addition to other wireless networks and/or technologies of radio access. [0039] In one aspect, eNBs 120 and 130 can provide wireless communication coverage for the respective geographic areas. The geographical area covered may be denoted an eNB 120 or eNB 130 cell. According to an example, the eNB 120 may be associated with a macro cell, which covers a relatively large geographical area. The eNB 120 can allow unrestricted access to the UEs. UE 110, in one example, may be a cellular macro UE configured to access a communication network via eNB 120, which is associated with a macro cell. Typically, UE 110 may perform a cell search to detect eNB 120. During a cell search, UE 110 may acquire frequency and symbol synchronization with a cell, such as a cell served by eNB 120, acquire frame timing from the cell, and determine a physical layer cell identity associated with the cell. In one aspect, LTE supports 504 distinct physical layer cell entities, where this set of cell identities is further divided into 168 cell identity groups that include three cell identities each. [0040] To facilitate cell search, eNB 120 can transmit a primary sync signal (PSS) and a secondary sync signal (SSS). The PSS, in one aspect, can be a 63-length extended Zadoff-Chu sequence with five zeros on the edges and mapped to a center of 73 downlink sub-carriers. PSS can take one of three different values, where each value specifies a cell identity within a cell identity group. Upon detection of the PSS, the UE 110 can determine the partition timing (e.g., 5 ms timing) of the cell and the cell identity within the cell identity group associated with the eNB 120. After PSS detection, UE 110 can detect the SSS transmitted by eNB 120. The SSS can take one of 168 different values, where each value specifies a cell identity group. After detecting the SSS, the UE 110 can determine the radio frame timing, the physical layer cell identity associated with the eNB 120, the cyclic prefix length, and whether frequency division duplexing (FDD) or duplexing by time division (TDD) is employed. After SSS detection, UE 110 can proceed to decode the broadcast system information on a physical broadcast channel (PBCH). In particular, system information on PBCH may include a main information block that carries bandwidth information, PHICH configuration information and/or a system frame number. Subsequently, UE 110 can initiate random access procedures. [0041] In one example, the eNB 130 can be associated with a femto cell, which covers a relatively small geographic area (eg, a residence, an office, a building, etc.) and provides restricted access. For example, eNB 130 allows access by UEs included in a closed subscriber group (CSG). According to the example, the UE 110 can be excluded from the CSG. While in close proximity to the eNB 130 (e.g. within a supported coverage area), the UE 110 may experience interference from transmissions (e.g., broadcasts, sync signals, pilot signals, etc.) from the eNB 130. Such interference can reach levels high enough to prevent the UE 110 from detecting and acquiring the eNB 120 as described above. When the eNB 130 and eNB 120 are included in the same operator network, which is also a synchronized network, high interference situations arising from the development of femto cells, such as eNB 130, can result in more frequent blackouts. [0042] In heterogeneous networks (for example, networks including base stations with different energy classes (macro cells, femto cells, pico cells, etc.)), developments of femto cells or domestic B Nodes (HNBs) are typically unplanned by an operator. Accordingly, areas of high interference can spread randomly within a larger macro cell. To reduce the impact of femto cell developments in macrocellular UEs, the eNB 120 may periodically transmit a low-reuse preamble 140. The low-reuse preamble 140 may include identity information and/or system information, which facilitates detection of eNB 120 by UE 110. Additionally, low reuse preamble 140 may include a pilot or reference signal to facilitate coherent demodulation and decoding the preamble. In one aspect, low reuse preamble 140 can be transmitted so that there is a relatively large period between successive transmissions. For example, eNB 120 can transmit low reuse preamble 140 every 100 milliseconds. However, it should be appreciated that other transmission period lengths may be used and that the transmission period may be configured by an operator and/or dynamically tuned by system 100 based on interference measurements, system loading, etc. [0043] As an alternative to detecting a PSS/SSS transmission by the eNB 120, the UE 110 can detect and decode the low reuse preamble 140. For example, the PSS/SSS transmission of the eNB 120 can be blocked by high interference from the eNB 130. However, eNB 120 uses different resources to transmit the low reuse preamble 140 and, accordingly, the UE 110 can detect the preamble regardless of the high interference environment. [0044] Turning to Figure 2, a resource diagram 200 is illustrated and presents an illustrative low reuse preamble. Resource diagram 200 presents a low reuse preamble structure 202 that can be used with a normal cyclic prefix that includes 7 symbols per partition (14 per subframe) and a low reuse preamble structure 204 that can be used with a prefix extended cyclic which includes 6 symbols per partition (12 per subframe). According to an example, structures 202 and 204 can span 6 resource blocks (RBs) in the frequency dimension and a subframe (two partitions) in the time dimensions. It should be appreciated that the present claimed subject matter is not limited to the illustrative structures 202 and 204 illustrated in Figure 2 as it is contemplated that alternative structures, with varying sizes in frequency and/or time dimension, should be within the scope of the claims attached. [0045] As illustrated in Fig. 2, the low reuse preamble may include a plurality of sub-channels such as, but not limited to, a sync signal (e.g., low reuse sync signal (LR-SS)) , a broadcast channel (e.g. a low reuse broadcast channel (LR-BCH)) and/or a reference signal (e.g. a low reuse reference signal (LR-RS)). In one aspect, subchannels are placed within a subframe so that common reference signals (CRS) and the control region are avoided. In one aspect, the control region of a subframe can span 1, 2, or 3 symbols in the first partition for large system bandwidth, and up to 5 symbols in the first partition for small system bandwidth. Typically, control region symbols are the first symbols of a subframe. [0046] Common reference signals (also referred to as cell-specific reference signals) facilitate the generation of estimates and channel by a UE. An arrangement of common reference signal symbols may depend on a number of antenna ports configured for a base station. For example, each antenna port may have a respective common reference signal that occupies singular resource elements of a resource block. In one example, common reference signal symbols for four antenna ports may occupy one or more OFDM symbol resource elements as illustrated in structures 202 and 204. To avoid CRS and control signaling, the bottom preamble reuse can occupy symbols 5, 6, 9, 10, 12, and 13 of a subframe for normal cyclic prefix and symbols 4, 5, 8, 10, and 11 for extended cyclic prefix. In particular, LR-SS can occupy symbol 5 (normal cyclic prefix) or symbol 4 (extended cyclic prefix), LR-BCH can use symbols 6, 9, 10, 12, and 13 (normal cyclic prefix) or symbols 5 , 8, 10 and 11 (extended cyclic prefix), and LR-RS can be incorporated into symbols 9 and 12 for normal cyclic prefix or symbols 8 and 10 for extended cyclic prefix. [0047] In one aspect, LR-SS allows fast detection of low reuse preamble through sync signal detection as described above. Additionally, LR-SS facilitates the scrambling and/or randomization of LR-BCH or LR-RS to reduce low reuse preamble detection error. For example, LR-SS can facilitate shifting and scrambling of the LR-RS position. In another example, LR-SS can facilitate cyclic redundancy check (CRC) scrambling and masking of LR-BCH. To further facilitate cell search, LR-SS can carry at least some of the identity information. For example, LR-SS can include a partial cell identity (e.g. a cell identity group or identity within a group) or LR-SS can include a whole cell identity. In one aspect, LR-SS may use the PSS/SSS design of LTE Version 8. For example, LR-SS may include one Zadoff-Chu sequence of 63 in length and/or two M sequences in length. 31 concatenated together. In another aspect, LR-SS can employ an optimized sequence that provides good cross-correlation properties. [0049] LR-RS can employ the LTE Version 8 common reference (RS) design. For example, two loops (eg LR-RS0 and LR-RS1) can be used to support 2 transmit antennas. Position shifting and/or scrambling can be based on an LR-SS sequence. In another example, scrambling may be based on an interlace and/or RS position index. In another aspect, LR-RS may employ dedicated LTE version 8 or UE-specific reference signal design. In another aspect, LR-RS can use a generic RS sequence and placement. For example, a predetermined sequence and/or resource element locations can be used to generate LR-RS. The predetermined sequence can be a sequence with good cross-correlation properties to facilitate fast preamble detection through LR-RS. [0050] Similar to LR-RS and LR-SS, LR-BCH can use LTE Version 8 PBCH design. In one aspect, LR-BCH can support frequency and space block coding diversity (SFBC) . A UE may perform blind decoding of an SFBC transmission or a non-SFBC transmission to determine whether diversity has been employed. Additionally, a CRC masking applied to LR-BCH can include diversity information. In another aspect, LR-BCH can use QPSK modulation and convoluted back bit coding. [0051] In another example, the low reuse preamble can conform to LTE Version 8 partition boundaries such that the first two symbols of the low reuse preamble are in a first partition and the remaining symbols are in a second partition . Intra-subframe skipping can be used so that each partition jumps at different frequency locations. [0052] Referring now to Fig. 3, a resource diagram 300 is illustrated and presents an illustrative low reuse preamble. Resource diagram 300 presents a low reuse preamble structure 302 that can be used with a normal cyclic prefix that includes 7 symbols per partition (14 per subframe) and a low reuse preamble structure 304 that can be used with a prefix extended cyclic which includes 6 symbols per partition (12 per subframe). According to an example, structures 302 and 304 can span 6 resource blocks (RBs) in the frequency dimension and a subframe (two partitions) in the time dimensions. It should be appreciated that the present claimed subject matter is not limited to the illustrative structures 302 and 304 illustrated in Figure 3 as it is contemplated that alternative structures, with varying sizes in frequency and/or time dimension, should be within the scope of the claims attached. [0053] In one aspect, structures 302 and 304 have respective low-reuse preambles that do not include a synchronization signal (eg, LR-SS). To avoid CRS and control signaling, the low reuse preamble can occupy symbols 5, 6, 9, 10, 12 and 13 of a subframe for the normal cyclic prefix and symbols 4, 5, 8, 10 and 11 for the prefix extended cyclic. In particular, LR-BCH can use symbols 5, 6, 9, 10, 12 and 13 (normal cyclic prefix) or symbols 4, 5, 8, 10, and 11 (extended cyclic prefix) and LR-RS can be incorporated into the symbols 5, 9 and 12 for normal cyclic prefix or symbols 4, 8 and 10 for extended cyclic prefix. [0054] Turning to Figure 4, a system 400 is illustrated facilitating the generation and transmission of a low-reuse preamble according to several aspects. System 400 may include UE 110 as described with respect to the preceding figures. UE 110 may be located within respective coverage areas associated with at least two base stations, such as base station 410 and base station 420. Base stations 410 and 420 may respectively be associated with one of a variety of classes power. For example, base stations 410 and 420 may individually be one of a base station macro associated with a macro cell, a femto base station associated with a femto cell, or a pico base station associated with a pico cell. [0055] UE 110 may be configured to communicate with base station 410 and/or base station 420 via downlink and uplink channels. In a united cell configuration, the UE 110 may communicate with one of a base station 410 or base station 420, which may be denoted as a serving base station. However, it is appreciated that the UE 110 may be configured for multi-cell communication, such as a multiple coordinate point (CoMP) operation, where the UE 110 communicates via uplink and downlink channels with both base stations. 410 and 420. [0056] Before accessing the base station 410 and/or 420, the UE 110 assumes a cell search procedure. The cell search procedure can be performed in connection with an initial synchronization or new cell identification. In one example, UE 110 performs an initial synchronization when UE 110 is powered on or when UE 110 loses a connection with a serving cell. When already connected to a cell, UE 110 can perform cell search to identify a new neighbor cell, which can lead to a handover or a new cell selection. [0057] In one aspect, UE 110 may attempt detection and/or acquisition of base stations 410 and/or 420, but suffers high levels of interference from an interfering base station 450. According to an example, the interfering base station 450 may be a femto base station associated with a femto cell, which is typically a low energy access point in a CSG. A subscriber (e.g., UE 110) that is not a member of the CSG cannot access the interfering base station 450. Accordingly, signals transmitted by the interfering base station 450 may inhibit an ability of the UE 110 to receive signals from the base stations 410 and 420. In some situations, interference from interfering base station 450 may prevent detection and acquisition of base stations 410 and 420 during cell search. [0058] To allow detection despite high interference, base stations 410 and 420 may respectively transmit low reuse preambles (LRPs) 430 and 440. LRPs 430 and 440 may include information such as, but not limited to, identities cell counts, resources released, bandwidth sizes, frame numbers, etc. In one aspect, UE 110 may receive and evaluate LRPs 430 and 440 to detect base stations 410 and 420 independently of interference from interfering base station 450. [0059] The base station 410, in one aspect, may include a preamble generating module 412 that builds the low-reuse preamble 430. The low-reuse preamble 430 may include a set of subchannels. The set of subchannels may include a sync channel, a broadcast channel, and/or a pilot channel. Turning briefly to Fig. 5, a detailed preamble generation module 412 is illustrated in accordance with one aspect. Preamble generating module 412 may include sync signal generating module 502 that provides a sync signal for including in a sync signal subchannel (e.g., LR-SS). The sync signal may carry a cell identity associated with base station 410. In one aspect, the sync signal generating module 502 may use a Zadoff-Chu sequence of length 63, the value of which is a partial cell identity. In another aspect, signal generation module 502 may interleave two M-sequences of length 31 to generate a synchronization signal that includes a partial cell identity. In another aspect, the synchronization signal generation module 502 may employ both a length 63 Zadoff-Chu sequence and two length 31 M sequences to provide a complete cell identity. In another example, an optimized binary sequence or Chu can be employed. The optimized sequence can include cell identity information while providing improved cross-correlation properties. Additionally, the sync signal generation module 502 can implement additional scrambling when the low-reuse preamble is located in a central part of the system bandwidth. [0060] The preamble generation module 412 may also include a reference signal generation module 504, which builds a low-reuse reference signal. In one aspect, the reference signal generation module 504 can employ a sequence used for a common signal or cell-specific reference signal to generate the low-reuse reference signal. For example, the low reuse reference signal can be one of 504 distinct reference signal sequences, where each sequence corresponds to a particular cell identity. [0061] In another aspect, the preamble generation module 412 may include a broadcast signal generation module 506 that generates a payload to include in a low-reuse broadcast channel. The payload may include system information such as information regarding system bandwidth, a cell identity (e.g., a physical layer cell identity), system frame number, resource released, and/or other information that facilitate the acquisition of the base station 410. A CRC can then be inserted into the payload. In one example, CRC may be based on a sequence used for a low-reuse synchronization signal. In another aspect, the CRC may include special diversity information (eg, whether diversity is applied and/or what type). The broadcast signal generation module 506 can apply convoluted bit-back coding on the CRC-fixed payload; however, it should be appreciated that other coding techniques (eg turbo coding, convolute coding, etc.) may be applied and should fall within the scope of the appended claims. After encoding, broadcast signal generation module 506 can modulate the encoded block. In an example, QPSK can be used. [0062] Returning to Fig. 4, base station 410 may also include a preamble placement module 414 that maps low-reuse preamble 430 into downlink resources. In one example, the preamble placement module 414 may use a resource structure, such as structure 202, 204, 302, and 304 described above, or another suitable structure to place the low reuse preamble subchannel set. 430. In particular, preamble placement module 414 may incorporate low-reuse preamble 430 into a downlink traffic channel (e.g., physical downlink shared channel (PDSCH) portion) of a subframe. By embedding low reuse preamble 430 in PDSCH, the preamble becomes transparent to legacy UEs as resources used by the preamble will be ignored. [0063] In one aspect, preamble placing module 414 can select a strip of block of 6 resources within a subframe to locate low reuse preamble 430. Additionally, a preamble placing module 414 can select any subframe for transmit the low reuse preamble; however, in one example, subframes 0 and 5 may be reserved in a low-bandwidth system (for example, a six-resource block bandwidth). [0064] According to another aspect, the base station 410 may include a preamble transmission module 416 that determines when to transmit the low reuse preamble 430. The preamble transmission module 416 may base transmission decisions on a period of transmission. The transmission period can be pre-configured by an operator of system 400. In another example, the preamble transmission module 416 can dynamically configure the transmission period based on interference measurements (eg, channel estimates, indication of channel quality, etc.), system loading, and the like. The transmission period can be relatively long (for example, 100 milliseconds); however, it should be appreciated that the present claimed subject matter is not limited to this transmission period as it is contemplated that other periods may be configured and should not fall within the scope of the appended claims (e.g., 50 milliseconds, 100 milliseconds , 150 milliseconds, 200 milliseconds, etc.). In another example, preamble transmission module 416, after reaching a low-reuse preamble transmission opportunity as indicated by the transmission period, can determine whether low-reuse preamble 430 should be transmitted during the opportunity. For example, preamble transmission module 416 may use a pseudorandom number generator to select whether or not to transmit. [0065] As further illustrated in system 400, base station 410 may include a processor 417 and/or a memory 419, which may be used to implement some or all of the functionality of the preamble generation module 412, the preamble placement module. preamble 414, preamble transmit module 416, and/or other functionality of base station 410. [0066] Figure 6 presents a system 600 that facilitates the detection of a base station through a low-reuse preamble according to several aspects. System 600 may include UE 110, base station 410, base station 420, and interfering base station 450, which may be substantially similar to and perform similar functionality to like-numbered components described above with reference to the preceding figures. In one aspect, UE 110 may detect base stations 410 and/or 420 through low reuse preambles 430 and 440, respectively. UE 110 may discover base stations 410 and/or 420 while experiencing high levels of interference due to interfering base station 450 (e.g., a femto cell or other inaccessible cell). [0067] The UE 110 can include a detection module 612, an evaluation module 614 and/or a synchronization module 616. The detection module 612 can monitor a traffic channel (e.g., a part of a subframe associated with the user data) to detect low reuse preambles, such as preambles 430 and 440 associated with base stations 410 and 420. In one example, UE 110 may employ synchronization module 616 to synchronize with a network associated with base stations 410, 420, and 450. For example, the network can be a synchronized network. Accordingly, sync module 616 may use interfering signals transmitted by base station 450 to acquire frame and/or split timing. Such timing synchronization can facilitate the identification of a traffic channel portion of the subframes that include low reuse preambles 430 and 440. [0068] The evaluation module 614 can demodulate and decode a detected low reuse preamble to obtain information about a cell. In one aspect, the evaluation module 614 can parse LR-SS (a synchronization signal in the low reuse preamble) to identify a coded sequence. The evaluation module 614 can use the sequence to decrypt LR-BCH and LR-RS in addition to identifying the RS symbol positions. LR-RS can facilitate coherent demodulation and decode LR-BCH, which contains system information to facilitate cell acquisition. [0069] As further illustrated in system 600, UE 110 may include a processor 617 and/or a memory 619 that can be used to implement some or all of the functionality of detection module 612, evaluation module 614, synchronization module 616, and/or other functionality of the UE 110. [0070] With reference to figures 7 and 8, the methodologies are described related to the facilitation of cell detection through low-reuse preambles transmitted, with low energy, periodically by the base stations. The methodologies can be implemented by the 100, 400, 500 and/or 600 systems described above. While for the sake of simplicity of explanation the methodologies are illustrated and described as a series of acts, it should be understood and appreciated that the methodologies are not limited by the order of the acts, as some acts may, according to one or more modalities , occur in different orders and/or simultaneously with other acts from what was illustrated and described here. For example, those skilled in the art will understand and appreciate that a methodology may alternatively be represented as a series of interrelated states or events, such as in a state diagram. Furthermore, not all illustrated acts may be necessary to implement a methodology according to one or more modalities. [0071] Turning to figure 7, a method 700 for detecting base stations in high interference environments is illustrated. Method 700 can be employed, for example, by a UE (e.g. UE 110) to acquire a cell despite high levels of interference. At reference numeral 702, a low reuse preamble, transmitted by a base station, is detected. In one example, a traffic channel (eg, a physical downlink shared channel) can be monitored to detect the low reuse preamble. Traffic channel monitoring can be facilitated by synchronization within a network associated with the base station via an interfering base station. After synchronization a traffic channel part of a subframe can be identified. [0072] In another aspect, the low reuse preamble may include a synchronization signal, a broadcast channel and/or a reference signal. The detection of the low reuse preamble can be performed by identifying (e.g. detecting) the low reuse preamble synchronization signal. In reference numeral 704, the low reuse preamble is evaluated to identify system information associated with the base station. In one aspect, the system information may include at least one of cell identity information, system bandwidth information, system frame number, hybrid auto-repeat request channel configuration information, random access information. , operator information and/or restriction information. In one example, system information can be obtained by decoding the broadcast channel included in the low-reuse preamble. [0073] Referring now to Fig. 8, a method 800 for employing a low-reuse preamble to facilitate cell search in high interference environments is illustrated. Method 800 may be employed, for example, by a base station (e.g., eNB 120, base station 410, base station 420, etc.) to allow UEs to detect the base station. At reference numeral 802, a low reuse preamble is generated. In one aspect, the low reuse preamble may include system information associated with a base station. The low reuse preamble may include a sync signal, a broadcast channel or a reference signal. In one example, the sync signal may include a Zadoff-Chu sequence. In another example, a binary sequence can be used. Additionally, a sequence used for the synchronization signal can be optimized to provide improved cross-correlation properties. When generating the broadcast channel and/or reference signal, the sequence employed for the synchronization signal can be used to encrypt the broadcast channel and/or reference signal. The reference signal may be generated based on a common reference signal structure employed for the downlink cell-specific reference signals. Additionally, broadcast channel generation may include encoding system information on the broadcast channel. To encode system information, convolute encoding and/or QPSK modulation can be employed. However, it should be appreciated that other coding and/or modulation techniques can be used for the broadcast channel. [0074] In reference numeral 804, the low reuse preamble can be incorporated into a traffic channel in a subframe. In one example, the low reuse preamble can be incorporated by preventing subframe symbols from carrying common reference and control signaling signals. For example, control signaling symbols and common reference signal symbols can be identified in a subframe. These symbols can be avoided by placing the low reuse preamble in the subframe in a non-overlapping fashion. In reference numeral 806, the low reuse preamble is transmitted to at least one mobile device. [0075] It will be appreciated that, according to one or more aspects described here, inferences can be made regarding the detection of a low-reuse preamble, configuring a transmission period of the low-reuse preamble, evaluating the low-reuse preamble and similar. As used herein, the term "inferring" or "inference" generally refers to the process of rationalizing about or inferring system, environment and/or user states from a set of observations captured through events and/or data. Inference can be used to identify a specific context or action, or it can generate a probability distribution across states, for example. Inference can be probabilistic - that is, computing a probability distribution across the states of interest based on a consideration of data and events. Inference can also refer to techniques employed to compose higher-level events from a set of events and/or data. Such inference results in the construction of new events or actions from a set of observed events and/or stored event data, whether or not the events are correlated in temporal proximity and whether the events and data come from one or several sources of events and data. [0076] Referring below to figure 9, an equipment 900 that facilitates the detection of base stations in high interference environments is illustrated. It should be appreciated that apparatus 900 is represented as including functional blocks, which may be functional blocks that represent functions implemented by a processor, software, or combination thereof (e.g., firmware). Equipment 900 may be implemented by a mobile device (e.g. a UE 110) and/or any other suitable network entity. Apparatus 900 may include a module 902 for detecting a low reuse preamble transmitted by a base station, and a module 904 for analyzing the low reuse preamble to obtain system information associated with the base station. Additionally, apparatus 900 may include an optional module 906 for monitoring a traffic channel of a subframe to locate the low reuse preamble, an optional module 908 for synchronizing with a network associated with the base station through an interfering base station, an optional module 910 for identifying a low reuse preamble sync signal, and an optional module 912 for decoding the broadcast channel. Additionally, apparatus 900 may include a memory 914 that holds instructions for performing functions associated with modules 902-912. [0077] Returning to figure 10, an equipment 100 that facilitates cell search in high interference environments is illustrated. It should be appreciated that equipment 1000 is represented as including functional blocks, which may be functional blocks that represent functions implemented by a processor, software, or combinations thereof (eg, firmware). Equipment 1000 may be implemented by a base station (e.g. eNB 120, base station 410, etc.) and/or any other suitable network entity. Equipment 1100 may include a module 1002 for generating a low-reuse preamble that includes system information, a module 1004 for embedding the low-reuse preamble in a traffic channel of a subframe, and a module 1006 for transmitting the preamble low reuse for at least one mobile device. Additionally, equipment 1000 may include a memory 1008 that holds instructions for executing the functions associated with modules 1002-1006. [0078] Figure 11 is a block diagram of another system 1100 that can be used to implement the various aspects of the functionality described here. In one example, system 1100 includes mobile device 1102. As illustrated, mobile device 1102 may receive signals from one or more base stations 1104 and transmit to one or more base stations 1104 via one or more antennas 1108. mobile device 1102 may comprise a receiver 1110 that receives information from antennas 1108. In one example, receiver 1110 may be operatively associated with a demodulator (Demod) 1112 that demodulates the received information. The demodulated symbols can then be analyzed by a processor 1114. Processor 1114 can be coupled to memory 1116, which can store data and/or program codes relating to mobile device 1102. Mobile device 1102 can also include a modulator 1118 that can store can multiplex a signal for transmission by a transmitter 1120 through antennas 1108. [0079] Figure 12 is a block diagram of a system 1200 that can be used to implement various aspects of the functionality described here. In one example, system 1200 includes a base station 1202. As illustrated, base station 1202 can receive signals from one or more UEs 1204 via one or more receiving antennas (Rx) 1206 and transmit to one or more UEs 1204 via one or more transmit antennas (Tx) 1208. Additionally, base station 1202 may comprise a receiver 1210 that receives information from receiver antennas 1206. In one example, receiver 1210 may be operatively associated with a demodulator (Demod) 1212 that demodulates the information received. The demodulated symbols can then be analyzed by a processor 1214. Processor 1214 can be coupled to memory 1216, which can store information relating to code clusters, access terminal designations, query related tables, unique scrambling sequences, and /or other suitable types of information. Base station 1202 may also include a modulator 1218 that can multiplex a signal for transmission by a transmitter 1220 via transmitter antennas 1208. [0080] Referring now to Fig. 13, a wireless communication system 1300 is illustrated in accordance with various embodiments presented here. System 1300 comprises a base station (e.g., access point) 1302 that may include multiple groups of antennas. For example, one group of antennas may include antennas 1304 and 1306, another group may comprise antennas 1308 and 1310, and an additional group may include antennas 1312 and 1314. Two antennas are illustrated for each group of antennas, however, more or less antennas can be used for each group. Base station 1302 may additionally include a transmit stream and a receive stream, each of which may, in turn, comprise a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.) as will be appreciated by those skilled in the art. [0081] The base station 1302 can communicate with one or more UEs such as the UE 1316 and the UE 1322; however, it should be appreciated that base station 1302 can communicate with substantially any number of UEs similar to UEs 1316 and 1322. UEs 1316 and 1322 can be, for example, cellular phones, smart phones, laptops, communication devices handhelds, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other device suitable for communication via wireless communication system 1300. As shown, UE 1316 is in communication with antennas 1312 and 1314, where antennas 1312 and 1314 transmit information to UE 1316 over downlink 1318 and receive information from UE 1316 over uplink 1320. In addition, UE 1322 is in communication with antennas 1304 and 1306, where antennas 1304 and 1306 transmit information to UE 1322 over downlink 1324 and receive information from UE 1322 over uplink 1326. In an FDD system, downlink te 1318 may use a different frequency band than used by uplink 1320, and downlink 1324 may employ a different frequency band than used by uplink 1326, for example. Additionally, in a TDD system, downlink 1318 and uplink 1320 can use a common frequency band, and downlink 1324 and uplink 1326 can use a common frequency band. [0082] Each antenna group and/or the area in which they are to communicate can be referred to as base station sector 1302. For example, antenna groups can be designed to communicate with UEs in a sector of the areas covered by the station base 1302. In downlink communication 1318 and 1324, base station transmitter antennas 1302 may use beamforming to improve downlink signal-to-noise ratio 1318 and 1324 for UEs 1316 and 1322. base station 1302 uses beamforming to transmit to UEs 1316 and 1322 randomly spread across an associated coverage, the UEs in neighboring cells may be subjected to less interference compared to a base station transmitting through a single antenna to all of its UEs. Furthermore, UEs 1316 and 1322 can communicate directly with each other using a peer-to-peer or ad hoc technology (not shown). [0083] According to an example, system 1300 may be a multiple input, multiple output (MIMO) communication system. Additionally, system 1300 can use substantially any type of duplexing technique to divide communication channels (e.g., downlink, uplink, etc.), such as FDD, FDM, TDD, TDM, CDM, and the like. Additionally, communication channels can be orthogonalized to allow simultaneous communication with multiple devices or UEs across the channels; in an example, OFDM can be used in this regard. In this way, channels can be divided into frequency parts over a period of time. Additionally, frames can be defined as frequency parts across a collection of time periods; thus, for example, a frame can comprise a number of OFDM symbols. Base station 1302 can communicate with UEs 1316 and 1322 through channels, which can be created for various types of data. For example, channels can be created for communicating various types of general communication data, control data (eg, quality information for other channels, acknowledgment indicators for data received through the channels, interference information, reference signs, etc.), and/or the like. [0084] A wireless multiple access communication system can simultaneously support communication to multiple wireless access terminals. As mentioned above, each terminal can communicate with one or more base stations through transmissions on the forward and reverse links. The forward link (or downlink) refers to the communication link from the base stations to the terminals, and the reverse link (or uplink) refers to the communication link from the terminals to the base stations. This communication link can be established through a single-entry, single-exit system, a MIMO system, or some other type of system. [0085] A MIMO system employs multiple transmit antennas (NT) and multiple receive antennas (NR) for data transmission. A MIMO channel formed by NT transmitting antennas and NR receiving antennas can be decomposed into NS independent channels, which are also referred to as spatial channels, where NS<min {NT NR}. Each of the NS independent channels corresponds to a dimension. The MIMO system can provide improved performance (eg, greater throughput and/or greater reliability) if the additional dimensions created by multiple transmit and receive antennas are used. [0086] A MIMO system can support TDD and FDD. In a TDD system, forward and reverse link transmissions are in the same frequency region so that the principle of reciprocity allows estimation of the forward link channel from the reverse link channel. This allows the access point to extract the transmit beamforming gain on the forward link when multiple antennas are available at the access point. [0087] Figure 14 illustrates an example of wireless communication system 1400. Wireless communication system 1400 features a base station 1410 and an access terminal 1450 for brevity. However, it should be appreciated that system 1400 may include more than one base station and/or more than one access terminal, where additional base stations and/or access terminals may be substantially similar or different from illustrative base station 1410 and 1450 access terminal described below. Additionally, it should be appreciated that base station 1410 and/or access terminal 1450 may employ the systems (figures 1, 4, 5, 6 and 9 and 10) and/or the method (figures 7 and 8) described here to facilitate wireless communication between them. [0088] At base station 1410, traffic data for several data streams is provided from a data source 1412 to a transmission data processor (TX) 1414. According to an example, each data stream may be transmitted through a respective antenna. The TX data processor 1414 formats, encodes and interleaves the traffic data stream based on a particular encoding scheme selected for that data stream to provide encoded data. [0089] The encoded data for each data sequence can be multiplexed with pilot data using OFDM techniques. Additionally or alternatively, the pilot symbols can be FDM, TDM or code division multiplexer (CDM). Pilot data is typically a known data pattern that is processed in a known manner and can be used at access terminal 1450 to estimate the channel response. The multiplexed and encoded pilot data for each data stream can be modulated (eg, symbol-mapped) based on a particular modulation scheme (eg, BPSK, QPSK, M-PSK, M-QAM, etc.) selected for that data string to provide modulation symbols. The data rate, encoding, and modulation for each data stream can be determined by instructions performed or provided by processor 1430. [0090] The modulation symbols for the data sequences can be provided to a MIMO TX processor 1420, which can further process modulation symbols (eg for OFDM). The MIMO TX processor 1420 then provides NT modulation symbol sequences to NT transmitters (TMTR) 1422a through 1422t. In various embodiments, the MIMO TX processor 1420 applies beamforming weights to the data stream symbols and to the antenna from which the symbol is being transmitted. [0091] Each transmitter 1422 receives and processes a respective symbol sequence to provide one or more analog signals, and further conditions (e.g., amplifies, filters, and upconverts) the analog signals to provide a modulated signal suitable for transmission over the MIMO channel. Additionally, NT modulated signals from transmitters 1422a to 1422t are transmitted from NT antennas 1424a to 1424t, respectively. [0092] At the access terminal 1450, the transmitted modulated signals are received by NR antennas 1452a to 1452r and the received signal from each antenna 1452 is provided to a respective receiver (RCVR) 1454a to 1454r. Each receiver 1454 conditions (e.g., filters, amplifies, and downconverts) a respective signal, digitizes the conditioned signal to provide samples, and further processes the samples to provide a corresponding "received" symbol sequence. [0093] An RX data processor 1460 can receive and process NR symbol sequences received from NR receivers 1454 based on a particular receiver processing technique to provide NT "detected" symbol sequences. RX data processor 1460 can demodulate, deinterleave, and decode each detected symbol sequence to retrieve traffic data for the data sequence. The processing by the RX 1460 data processor is complementary to that performed by the MIMO TX 1420 and TX 1414 data processor at base station 1410. [0094] A 1470 processor may periodically determine which available technology to use as discussed above. Additionally, processor 1470 can formulate a reverse link message comprising an array index part and a rank value part. [0095] The reverse link message can comprise various types of information regarding the communication link and/or the received data sequence. The reverse link message can be processed by a TX 1438 data processor, which also receives traffic data for a number of data streams from a data source 1436, modulated by a modulator 1480, conditioned by transmitters 1454a to 1454r and transmitted back to base station 1410. [0096] At the base station 1410, the modulated signals from the access terminal 1450 are received by antennas 1424, conditioned by the receivers 1422, demodulated by a demodulator 1440 and processed by an RX data processor 1442 for extracting the reverse link message transmitted by the access terminal 1450. Additionally, processor 1430 may process the extracted message to determine which precoding matrix to use to determine the beamforming weights. [0097] Processors 1430 and 1470 may direct (e.g., control, coordinate, manage, etc.) operation at base station 1410 and access terminal 1450, respectively. Respective processors 1430 and 1470 can be associated with memory 1432 and 1472 that store program codes and data. Processors 1430 and 1470 may also perform computations to derive frequency and impulse response estimates for uplink and downlink, respectively. [0098] In one aspect, logical channels are classified into Control Channels and Traffic Channels. Logical Control Channels may include a Broadcast Control Channel (BCCH), which is a DL channel for broadcasting system control information. Additionally, Logical Control Channels may include a Radio Location Control Channel (PCCH), which is a DL channel that transfers radio location information. In addition, the Logical Control Channels may comprise a Multicast Control Channel (MCCH), which is a point-to-multipoint DL channel used for the transmission of Multicast and Multicast Service (MBMS) scheduling and control information for one or several MTCHs. Generally, after establishing a Radio Resource Control (RRC) connection, this channel is only used by UEs that receive MBMS (eg old MCCH + MSCH). Additionally, Logical Control Channels can include a Dedicated Control Channel (DCCH), which is a bidirectional point-to-point channel that transmits dedicated control information and can be used by UEs having an RRC connection. In one aspect, the Logical Traffic Channels may comprise a Dedicated Traffic Channel (DTCH), which is a point-to-point bidirectional channel dedicated to a UE for the transfer of user information. In addition, the Logical Traffic Channels may include an MTCH for the point-to-multipoint DL channel for transmitting traffic data. [0099] In one aspect, Transport Channels are classified into DL and UL. DL Transport Channels comprise a Broadcast Channel (BCH), a Downlink Shared Data Channel (DL-SDCH) and a Location Radio Channel (PCH). The PCH can support the UE power savings (e.g. Discontinuous Reception (DRX) cycle can be indicated by the network to the UE) by being broadcast across an entire cell and being mapped to the physical layer (PHY) resources that can be used for other control and traffic channels. UL Transport Channels may comprise a Random Access Channel (RACH), a Request Channel (REQCH), an Uplink Shared Data Channel (UL-SDCH) and a plurality of PHY channels. [00100] PHY channels can include a set of DL channels and UL channels. For example, PHY DL channels can include: Common Pilot Channel (CPICH); Synchronization Channel (SCH); Common Control Channel (CCCH); Shared DL Control Channel (SDCCH); Multicast Control Channel (MCCH); Shared UL Designation Channel (SUACH); Receipt Notice Channel (ACKCH); DL Physical Shared Data Channel (DL-PSDCH); UL Power Control Channel (UPCCH); Radio Location Indicator Channel (PICH); and/or Load Indicator Channel (LICH). By way of additional illustration, PHY UL Channels may include: Physical Random Access Channel (PRACH); Channel Quality Indicator Channel (CQICH); Receipt Notice Channel (ACKCH); Antenna Subset Indicator Channel (ASICH); Shared Request Channel (SREQCH); UL Physical Shared Data Channel (UL-PSDCH); and/or Broadband Pilot Channel (BPICH). [00101] The various illustrative logics, logic blocks, module and circuits described with respect to the modalities described here can be implemented or realized with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC ), a field-programmable gate (FPGA) assembly 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 in the alternative, the processor can be any conventional processor, controller, microcontroller, or state machine. A processor can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors together with a DSP core, or any other similar configuration. Additionally, at least one processor may comprise one or more modules that operate to perform one or more of the steps and/or actions described above. [00102] Additionally, the steps and/or actions of a method or algorithm described with respect to the aspects described here can be directly embodied 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, hard disk, floppy disk, CD-ROM, or any other form of storage medium known in the art. An illustrative storage medium may be 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 to the processor. Additionally, in some respects, the processor and storage medium may reside on an ASIC. Additionally, the ASIC can reside on a user terminal. Alternatively, the processor and storage medium can reside as discrete components in a user terminal. Additionally, in some aspects, the steps and/or actions of a method or algorithm may reside as one or any combination or set of codes and/or instructions on a machine-readable medium and/or a computer-readable medium, which can be incorporated in a computer program product. [00103] When modalities are implemented in software, firmware, middleware or microcode, program code or code segments, they may be stored on a machine-readable medium, such as a storage component. A code segment can represent a procedure, a function, a subprogram, a program, a routine, a subroutine, a module, a software package, a class, or any combination of instructions, data structures, or program declarations. . A code segment can be coupled to another code segment or a hardware circuit by passing and/or receiving information, data, arguments, parameters or memory contents. Information, arguments, parameters, data, etc. they can be passed, sent or transmitted using any suitable means including memory sharing, message passing, token passing, network transmission, etc. [00104] For a software implementation, the techniques described here can be implemented with modules (for example, procedures, functions, and so on) that perform the functions described here. Software codes can be stored in memory units and executed by processors. The memory unit can be implemented inside the processor or outside the processor, in which case it can be communicatively coupled to the processor through various means as is known in the art. [00105] The foregoing includes examples of one or more modalities. It is, of course, impossible to describe all possible combinations of components or methodologies for the purposes of describing the above mentioned embodiments, but those skilled in the art can recognize that many additional combinations and permutations of the various embodiments are possible. Accordingly, the described modalities shall encompass all said changes, modifications and variations that are within the spirit and scope of the appended claims. Additionally, to the extent that the term "includes" is used in the detailed description or claims, such term shall be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when used as a transitional word in a claim. Additionally, the term "or" as used in the detailed description or claims shall be "non-exclusive or non-exclusive".
权利要求:
Claims (11) [0001] 1. Method performed by a user equipment, UE, to allow detection of a base station (120) in high interference environments, characterized in that it comprises: detecting (702) a low-reuse preamble (430) transmitted by the base station (120) wherein the low-reuse preamble (430) is located in a traffic channel portion of a subframe, wherein the low-reuse preamble (430) includes at least one sync signal, a broadcast channel, and a reference signal, wherein the broadcast channel includes system information associated with the base station, wherein detecting the low-use preamble comprises detecting the synchronization signal included in the low-use preamble; and evaluating (704) the low reuse preamble (430) to identify system information associated with the base station, wherein evaluating the low reuse preamble comprises coherently decoding and demodulating the broadcast channel included in the preamble by using the included reference signals in the low reuse preamble. [0002] 2. Method according to claim 1, characterized by the fact that the traffic channel is a physical downlink shared channel. [0003] 3. Method according to claim 1, characterized in that the system information includes at least one of cell identity information, system bandwidth information, a system frame number, channel configuration information of hybrid auto-repeat request, random access information, carrier information or restriction information. [0004] 4. User equipment apparatus (900) that allows detecting a base station in high interference environments, characterized in that it comprises: means for detecting (902) a low-reuse preamble (430) transmitted by the base station (120), wherein the low-reuse preamble (430) is located in a traffic channel portion of a subframe, wherein the low-reuse preamble (430) includes at least a sync signal, a broadcast channel, and a reference signal. , wherein the broadcast channel includes system information associated with the base station, wherein detecting the low-use preamble comprises detecting the synchronization signal included in the low-use preamble; and means for evaluating (904) the low reuse preamble (430) to obtain system information associated with the base station, wherein evaluating the low reuse preamble comprises coherently decoding and demodulating the broadcast channel included in the preamble by using the broadcast signals. reference included in the low reuse preamble. [0005] 5. Apparatus (900) according to claim 4, characterized in that it comprises: a memory (914) containing recorded thereon the method as defined in any one of claims 1 to 3; and a processor, coupled to the memory (914), configured to execute the method stored in memory (914). [0006] 6. Apparatus (900) according to claim 4, characterized in that it comprises: a processor configured to: identify (702) a low-reuse preamble (430) transmitted by a base station, where the low-reuse preamble (430) ) is transmitted on a traffic channel part of a subframe; and evaluating (704) the low-reuse preamble to identify system information associated with the base station. [0007] 7. Method (800) performed by a base station (120) to allow detection of the base station (120) in high interference environments, characterized in that it comprises: generating (802) a low-reuse preamble (430), wherein the low reuse preamble (430) includes at least one of a sync signal, a broadcast channel, and a reference signal, wherein the broadcast channel includes system information associated with the base station; embedding (804) the low reuse preamble (430) in a traffic channel portion of a subframe; and transmitting (806) the low-reuse preamble (430). [0008] 8. Base station apparatus (1000), which allows detection of the base station (120) in high interference environments, characterized in that it comprises: means (1002) for generating a low-reuse preamble (430), wherein the preamble low reuse (430) includes at least one of a sync signal, a broadcast channel, and a reference signal, wherein the broadcast channel includes system information associated with the base station; means (1004) for embedding the low reuse preamble (430) in a traffic channel portion of a subframe; and means (1006) for transmitting the low reuse preamble (430). [0009] 9. Apparatus (1000) according to claim 8, characterized in that it comprises: a memory (1008) containing recorded thereon the method as defined in claim 7; and a processor, coupled to the memory (1008), configured to execute the method recorded in memory (1008). [0010] 10. Apparatus (1000) according to claim 8, characterized in that it comprises: a processor configured to: generate a low-reuse preamble that includes system information associated with a base station; embedding the low reuse preamble (430) in a traffic channel portion of the subframe; and transmitting the low reuse preamble (430). [0011] 11. Computer readable memory, characterized in that it contains recorded thereon the method as defined in any one of claims 1 to 3 or 7.
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引用文献:
公开号 | 申请日 | 公开日 | 申请人 | 专利标题 JP2000324535A|1999-05-07|2000-11-24|Matsushita Electric Ind Co Ltd|Frame synchronizing device in mobile communication system| JP2004150892A|2002-10-29|2004-05-27|Neikusu:Kk|Time synchronization signal transmitting apparatus, time synchronization signal receiving apparatus, and time synchronization signal carrier system| KR20050040988A|2003-10-29|2005-05-04|삼성전자주식회사|Communication method for frequency hopping ofdm based cellular system| JP4824486B2|2006-05-01|2011-11-30|株式会社エヌ・ティ・ティ・ドコモ|Base station and communication method| CA2653605A1|2006-06-21|2007-12-27|Qualcomm Incorporated|Methods and apparatus for measuring, communicating and/or using interference information| CN101098161B|2006-06-29|2010-11-10|大唐移动通信设备有限公司|Transmitting sequential detection method, time-domain down synchronization method and cell search method| UA94309C2|2007-01-10|2011-04-26|Квелкомм Инкорпорейтед|Facilate searches for a cell| KR101033689B1|2007-03-15|2011-05-12|한국전자통신연구원|Preamble allocation method and random access method in mobile communication system| JP4967756B2|2007-03-30|2012-07-04|富士通株式会社|Wireless communication device| US20090067386A1|2007-06-19|2009-03-12|Qualcomm Incorporated|Method and apparatus for cell reselection enhancement for e-utran| KR101375481B1|2007-07-06|2014-03-19|삼성전자주식회사|Method and apparatus of deciding communication mode in a communication system| US8842702B2|2007-07-17|2014-09-23|Qualcomm Incorporated|Control indications for slotted wireless communication| WO2009014356A1|2007-07-20|2009-01-29|Electronics And Telecommunications Research Institute|Method for generating downlink frame, and method for searching cell| US8467367B2|2007-08-06|2013-06-18|Qualcomm Incorporated|Multiplexing and transmission of traffic data and control information in a wireless communication system| US9119132B2|2007-10-10|2015-08-25|Qualcomm Incorporated|Efficient system identification schemes for communication systems| US8503547B2|2007-10-11|2013-08-06|Qualcomm Incorporated|Scrambling codes for secondary synchronization codes in wireless communication systems| US8705506B2|2007-11-16|2014-04-22|Qualcomm Incorporated|Time reservation for a dominant interference scenario in a wireless communication network| US20100278123A1|2007-12-10|2010-11-04|Nortel Networks Limited|Wireless communication frame structure and apparatus| KR101447750B1|2008-01-04|2014-10-06|엘지전자 주식회사|Method for performing random access process| US8135359B2|2008-01-04|2012-03-13|Nokia Corporation|Method and apparatus for conveying antenna configuration information| US9001791B2|2008-01-31|2015-04-07|Telefonaktiebolaget L M Ericsson |Detection of time division duplex downlink/uplink configuration| US8504091B2|2008-02-01|2013-08-06|Qualcomm Incorporated|Interference mitigation for control channels in a wireless communication network| US9801188B2|2008-02-01|2017-10-24|Qualcomm Incorporated|Backhaul signaling for interference avoidance| US8249029B2|2008-03-28|2012-08-21|Qualcomm Incorporated|Low reuse preamble for a wireless communication network| US20090310565A1|2008-06-13|2009-12-17|Fujitsu Microelectronics Limited|System And Method For Selecting Parameters In Wireless Communication| KR101527977B1|2008-10-27|2015-06-15|엘지전자 주식회사|Method of operating relay in wireless communication system| US8982851B2|2009-01-06|2015-03-17|Qualcomm Incorporated|Hearability improvements for reference signals|US8498579B2|2009-07-20|2013-07-30|Qualcomm Incorporated|Channel reuse in communication systems| EP2638741A1|2010-11-12|2013-09-18|Telefonaktiebolaget LM Ericsson |Determining a mobile communications network cell frequency| US8886203B2|2011-12-28|2014-11-11|Qualcomm Incorporated|Dynamic channel reuse in multi-access communication systems| US9143984B2|2012-04-13|2015-09-22|Intel Corporation|Mapping of enhanced physical downlink control channels in a wireless communication network| WO2013191385A1|2012-06-17|2013-12-27|엘지전자 주식회사|Method of determining sub frame in wireless communication system| CN109167655B|2013-01-18|2019-09-20|华为技术有限公司|Detection method, transmission method and the device of common control channel| CN103402240B|2013-07-09|2016-01-27|武汉邮电科学研究院|A kind of Small cell discover method| CN106061572A|2014-01-24|2016-10-26|华为技术有限公司|Information transmission method, user equipment and base station| CN105635002B|2014-11-04|2018-10-23|电信科学技术研究院|A kind of synchronous estimation method and receiving device| WO2016144222A1|2015-03-10|2016-09-15|Telefonaktiebolaget Lm Ericsson |Methods, network node and wireless device for handling access information| KR102065426B1|2015-07-16|2020-01-13|엘지전자 주식회사|A broadcast signal transmitting device, a broadcast signal receiving device, a broadcast signal transmitting method, and a broadcast signal receiving method| WO2017069668A1|2015-10-21|2017-04-27|Telefonaktiebolaget Lm Ericsson |Methods, network nodes and wireless device for handling access information| CN108353055A|2015-11-06|2018-07-31|英特尔Ip公司|Synchronization signal designs for protenchyma connected network communication| US10536940B2|2016-01-12|2020-01-14|Nokia Solutions And Networks Oy|Discovery signal block mapping| DE102016220882A1|2016-10-24|2018-04-26|Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.|Optimized hopping patterns for different sensor nodes and variable data lengths based on the telegram splitting transmission method| DE102016220883A1|2016-10-24|2018-04-26|Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.|Optimized combination of preamble and data fields for sensor networks with low power consumption based on the telegram splitting method| CN108809497B|2017-05-05|2021-11-02|展讯通信（上海）有限公司|Bearing method of time index, detection method and device, storage medium, base station and terminal| KR102362403B1|2017-06-05|2022-02-14|삼성전자 주식회사|Method and apparatus for requesting system information using a preamble in next generation mobile communication system|
法律状态:
2019-01-15| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]| 2020-02-27| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]| 2021-04-06| B09A| Decision: intention to grant [chapter 9.1 patent gazette]| 2021-06-22| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 14/07/2010, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF, , QUE DETERMINA A ALTERACAO DO PRAZO DE CONCESSAO. |
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申请号 | 申请日 | 专利标题 US22579509P| true| 2009-07-15|2009-07-15| US61/225,795|2009-07-15| US22600109P| true| 2009-07-16|2009-07-16| US61/226,001|2009-07-16| US12/834,219|US8902858B2|2009-07-15|2010-07-12|Low reuse preamble| US12/834,219|2010-07-12| PCT/US2010/042006|WO2011008878A1|2009-07-15|2010-07-14|Low reuse preamble| 相关专利
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