• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    ANTENNA PORT MAPPING FOR DEMODULATION REFERENCE SIGNS. The present invention provides a unified classification-independent mapping between antenna ports and group/code pairs. Each antenna port is uniquely associated with a code division multiplexing (CDM) group and an Orthogonal Coverage code (OCC). The mapping between antenna ports and/or group/code pairs is chosen such that, for a given antenna port, the CDM group and OCC will be the same for each transmission classification.
    公开号:BR112012016405B1
    申请号:R112012016405-8
    申请日:2010-01-20
    公开日:2021-06-08
    发明作者:George Jöngren；Yang Hu；David Astely；David Hammarwall；Xinghua Song；Jianfeng Wang
    申请人:Telefonaktiebolaget Lm Ericsson (Publ)；
    IPC主号:
    专利说明:

    Field of Invention
    [001] The present invention generally relates to demodulation reference signals (DM-RSs) for LTE communication systems and advanced LTE communication systems, and more particularly to the configuration of antenna ports for user-specific DM-RSs . Fundamentals of the Invention
    [002] The 3rd Generation Partnership Project (3GPP) is responsible for standardizing the UMTS (Universal Mobile Telecommunications Service) and LTE (Long Term Evolution) systems. LTE is a communication technology for realizing high-speed packet-based communication that can achieve high data rates in both downlink and uplink, which is a next-generation mobile communication system of UMTS system. The work of 3GPP on LTE is also called E-UTRAN (Evolved Universal Terrestrial Access Network). The first release of LTE, called Release-8 (Rel-8) can provide peak rates of 100 Mbps, a radio network delay of, for example, 5 ms or less, a significant increase in spectrum efficiency, and a network architecture designed to simplify network operation, reduce costs, etc. In order to support high data rates, LTE allows a system bandwidth of up to 20 MHz. LTE is also capable of operating in different frequency bands and can operate in either FDD (Frequency Division Duplex) or in TDD (Time Division Duplex) mode. The modulation technique or transmission scheme used in LTE is known as OFDM (Orthogonal Frequency Division Multiplexing).
    [003] For the next generation mobile communications system, eg advanced IMT (International Mobile Telecommunications) and/or advanced LTE, which is an evolution of LTE, support for bandwidths up to 100 MHz is being discussed. Advanced LTE can be seen as a future release of standard LTE and as it is an evolution of LTE, backwards compatibility is important so that advanced LTE can be developed into the spectrum already occupied by LTE. In both LTE and advanced LTE radio base stations known as evolved NodeBs (eNBs or eNodeBs), multiple input, multiple output (MIMO) and spatial multiplexing antenna configurations can be used to provide high data rates to terminals. users. Another example of a MIMO-based system is the WiMAX (Worldwide Interoperability for Microwave Access) system.
    [004] To perform coherent demodulation of different physical downlink channels, the user terminal needs downlink channel estimates. More specifically, in the case of OFDM transmissions, the user terminal needs an estimate of the complex channel of each subcarrier. One way to enable channel estimation in case of OFDM transmissions is to insert known reference symbols into the OFDM frequency/time grid. In LTE, these reference symbols are called downlink reference signals.
    [005] Two types of downlink reference signals are used in LTE systems: cell specific downlink reference signals and user specific downlink reference signals. The cell-specific downlink reference signals are transmitted in each downlink subframe, and span the entire downlink cell bandwidth. Cell-specific downlink reference signals can be used for channel estimation and coherent demodulation, except when spatial multiplexing is used. A user terminal downlink reference signal is used for channel estimation and demodulation of the downlink shared channel when spatial multiplexing is used. User-specific reference signals are transmitted within the resource blocks assigned to the specific user terminal to transmit data on the downlink shared channel. User-specific reference signals undergo the same precoding as data signals transmitted to the user terminal. The present invention is applicable to user terminal specific downlink reference signals.
    [006] FIG. 1 illustrates a part of an exemplified OFDM time-frequency grid 50 for LTE. Generally speaking, the time-frequency grid 50 is divided into one-millisecond subframes. A subframe is shown in FIG. 1. Each subframe includes a number of OFDM symbols. For a normal cyclic prefix (CP) connection, suitable for use in situations where multipath dispersion is expected to not be extremely severe, a subframe comprises fourteen OFDM symbols. A subframe comprises twelve OFDM symbols if an extended cyclic prefix is used. In the frequency domain, physical resources are divided into adjacent carriers with a spacing of 15 kHz. The number of subcarriers varies depending on the allocated system bandwidth. The smallest element of the time-frequency grid 50 is a resource element. A resource element comprises an OFDM symbol on a subcarrier.
    [007] In order to schedule the transmission in the downlink shared channel (DL-SCH), the downlink time-frequency resources are allocated in units called resource blocks (RBs). Each resource block comprises twelve subcarriers (which can be adjacent or spread across the frequency spectrum) and half a subframe. The term 'pair of resource blocks' refers to two consecutive resource blocks occupying an integer subframe of one millisecond.
    [008] Certain resource elements within each subframe are reserved for transmission of downlink reference signals. FIG. 1 illustrates an exemplified resource allocation pattern for downlink reference signals to support downlink transmissions up to classification 4. Twenty-four resource elements within a subframe are reserved for transmission of the downlink reference signals. More specifically, the demodulation reference signals are loaded into OFDM symbols 5, 6, 12, and 13 (i.e., the sixth, seventh, thirteenth, and fifteenth symbols) of the OFDM subframe. Resource elements for the demodulation reference signals are distributed in the frequency domain.
    [009] The resource elements for the demodulation reference signals are divided into two code division multiplexing (CDM) groups here called CDM Group 1 and CDM Group 2. IN LTE systems supporting transmission ratings from 1 to 4 , two CDM groups are used in combination with orthogonal length 2 coverage codes (OCCs). Orthogonal coverage codes are applied to sets of two reference symbols. The term "set", as used herein, refers to groupings of adjacent (in time domain) reference symbols on the same subcarrier. In the embodiment shown in FIG. 1, the subcarriers containing demodulation reference symbols include two sets each.
    [0010] FIG. 2 illustrates an exemplified resource element allocation for a spatial multiplexing system supporting up to eight transmission ratings. It can be noted that the resource allocation pattern is the same as the pattern shown in FIG. 1. To support higher transmission ratings, a length 4 OCC is used instead of a length 2 OCC. The length 4 OCC is applied through two sets of feature elements.
    [0011] Up to eight antenna ports can be defined to support up to 8 spatial layers. The 8 antenna ports can be mapped to two CDM groups, each using four OCCs. Thus, antenna ports can be uniquely identified by two parameters, that is, CDM group index and OCC index, here called index pair. Currently, mapping between antenna ports and index pairs has not been specified in the LTE standard. Some mappings can be classified dependent, which requires different port mappings to be used for each transmission classification. Using different port mappings for different transmission ratings imposes an overhead on the user terminal, which must perform channel estimation differently when the transmission rating changes. Invention Summary
    [0012] The present invention provides a unified classification-independent mapping between antenna ports and group/code pairs. Each antenna port is uniquely associated with a code division pair multiplexing (CDM) group and an orthogonal coverage code (OCC). The mapping between antenna ports and/or group/code pairs is chosen such that, for a given antenna port, the CDM group and OCC will be the same for each transmission classification.
    [0013] An exemplified embodiment of the invention comprises a method implemented by a base station to transmit demodulation reference signals to a user terminal. The method comprises determining a transmission classification for a downlink transmission to said user terminal; determining one or more reference signal antenna ports for said downlink transmission based on said transmission classification, where each port is defined by a group/code pair comprising a code division multiplexing group and an orthogonal code of roof; mapping the reference signal antenna ports to group/code pairs for each broadcast rating such that the code division multiplexing group and the coverage orthogonal code are the same for a given antenna port for each broadcast rating ; and transmitting said downlink reference symbols to said reference signal antenna ports.
    [0014] Yet another exemplified embodiment of the invention comprises a base station configured to implement the method described above.
    [0015] Another exemplified embodiment of the invention comprises a method implemented by a user terminal to receive demodulation reference signals transmitted by a base station. The user terminal method comprises determining a transmission classification for a downlink transmission to said user terminal; determining one or more reference signal antenna ports for said downlink transmission based on said transmission classification, where each port is defined by a group/code pair for each transmission classification such that the multiplexing group per code division and orthogonal coverage code are the same for a given antenna port for each transmission rating; and receiving said downlink reference symbols along said reference signal antenna ports corresponding to transmission classification.
    [0016] Yet another exemplified embodiment of the invention comprises a user terminal configured to implement the method described above. Brief Description of Drawings
    [0017] FIG. 1 illustrates the allocation of resource elements in an OFDM system for demodulation reference signals to support transmission ratings up to 4.
    [0018] FIG. 2 illustrates the allocation of resource elements in an OFDM system for demodulation reference signals to support transmission ratings up to 8.
    [0019] FIG. 3 illustrates an exemplified MIMO communication system.
    [0020] FIG. 4 illustrates an exemplified transmission signal processor for an OFDM system.
    [0021] FIG. 5 illustrates a mapping of codewords to layers according to an exemplified embodiment for transmission ratings 1 to 4.
    [0022] FIG. 6 illustrates an exemplified method for transmitting demodulation reference signals.
    [0023] FIG. 7 illustrates a method for receiving demodulation reference signals. Detailed Description of the Invention
    [0024] FIG. 3 illustrates a wireless multiple input/multiple output (MIMO) communication system 10 including a base station 12 (called a NodeB evolved in LTE), and a user terminal 14. The present invention will be described in the context of an LTE system. , although the present invention is applicable to other types of communication systems. Base station 12 includes a transmitter 100 for transmitting signals to second station 14 along a communication channel 16, while user terminal 14 includes a receiver 200 for receiving signals transmitted by base station 12. Those skilled in the art will appreciate that base station 12 and user terminal 14 may include either a transmitter 100 or a receiver 200 for bidirectional communications.
    [0025] An information signal is inserted into transmitter 100 at base station 12. Transmitter 100 includes a controller 110 to control the general operation of transmitter 100 and a transmission signal processor 120. The latter performs error coding, mapping the input bits for complex modulation symbols, and generates transmit signals for each transmit antenna 130. After upconversion, filtering and amplification, the transmitter 100 transmits the transmit signals from the respective transmit antennas 130 through from communication channel 16 to user terminal 14.
    Receiver 200 at user terminal 14 demodulates and decodes signals received at each antenna 230. Receiver 200 includes a controller 210 to control the operation of receiver 200 and a receive signal processor 220. The latter demodulates and decodes the signal transmitted from the first station 12. The output signal from the receiver 200 comprises an estimate of the original information signal. In the absence of errors, the estimate will be the same as the original information signal input to transmitter 12.
    [0027] In LTE systems, spatial multiplexing can be used when multiple antennas are present at both base station 12 and user terminal 14. FIG. 4 illustrates the main functional components of a transmit signal processor 120 for spatial multiplexing. The transmission signal processor 120 comprises a layer mapping unit 122, a precoder 124, and resource mapping units 128. A sequence of information symbols (data symbols or reference symbols) is inserted into the data unit. layer mapping 122. The symbol sequence is split into one or two code words. The layer mapping unit 122 maps codewords into NL layers depending on transmission classification. It should be noted that the number of layers is not necessarily equal to the number of antennas 130. The different codewords are typically mapped to different layers; however, a single codeword can be mapped to one or more layers. The number of layers matches the selected transmission rating. After layer mapping, a set of NL symbols (one symbol from each layer) is linearly combined and mapped to NA antenna ports 126 by precoder 124. The matching/mapping is described by a precoding matrix of size NA x NL. The resource mapping unit 128 maps symbols to be transmitted on each antenna port 126 to resource elements assigned by the MAC scheduler.
    [0028] When a user terminal 14 is programmed to receive a downlink transmission on the downlink shared channel (DL-SCH), the MAC scheduler at transmitting station 12 allocates one or more pairs of resource blocks to the terminal. 14. As noted earlier, certain resource elements in each resource block are reserved for downlink reference signals. To support downlink transmission containing up to eight layers, user terminal specific downlink reference signals are required for eight layers. In accordance with the present invention, eight distinct reference signal antenna ports are defined to support transmissions with up to eight layers. Each antenna port is uniquely associated with a code division multiplexing (CDM) group and an orthogonal coverage code (OCC). The OCC can comprise, for example, a Walsh code of length 2 or length 4, although orthogonal codes can also be used. For convenience, CDM groups can be identified by a group index having a value from 1 to 2, and OCC can be identified by a code index having a value from 1 to 4. The combination of a CDM group and OCC is here called a group/code pair.
    [0029] In the exemplified modality, there are two CDM groups and 4 OCCs. Thus, there are eight possible combinations of CDM groups and OCCs (2 groups x 4 OCCs) so that eight layers can be supported. The mapping between antenna ports and group/code pairs is designed to be classification independent. More specifically, the mapping between the antenna ports and the group/code pairs is chosen such that, for a given antenna port, the CDM group and the OCC will be the same for each transmission classification.
    [0030] Table 1 below and FIG. 5 illustrate a possible mapping between antenna ports and group/code pairs according to an embodiment of the present invention.


    [0031] The OCCs are the Walsh codes given by the matrix of
    Walsh code:
    [0032] The antenna port mapping shown in Table 1 allocates CDM group 1 to ports 1, 2, 5 and 6 and CDM group 2 to ports 3, 4, 7 and 8. OCC1 is allocated to ports 1 and 3, OCC2 is allocated to ports 2 and 4, OCC3 is allocated to ports 5 and 7, and OCC 4 is allocated to ports 6 and 8.
    [0033] This antenna port mapping described above is classification independent so that a given antenna port will always use the same CDM and OCC group regardless of broadcast classification. Furthermore, antenna ports associated with a particular CDM group have a nesting property. That is, for the set of antenna ports associated with a given CDM group, the antenna ports used for a low transmit rating will be a subset of the antenna ports used for a higher transmit rating. Thus, for the antenna ports associated with CDM group 1, the ports used for transmission classification 1 are a subset of the ports used for transmission classification 2, which are a subset of the ports used for transmission classification 5, which are a subset of the ports used for broadcast classification 6. The same nesting property applies to antenna ports associated with CDM group 2.
    [0034] Another useful property of the antenna port mapping shown above is that OCCs of length 4 on certain antenna ports are identical to OCCs of length 2. For example, for transmission classification 2, the length Walsh codes 4 on antenna ports 1 and 2 look the same as the length 2 Walsh codes. In the case of single-user MIMO systems, this property enables user terminal 14 to use length 2 OCCs to perform channel estimation. Using length 2 OCCs for channel estimation allows receiver 200 to interpolate and thus provide more accurate channel estimates. Improved channel estimation is beneficial for high mobility user endpoints 14. Thus, for broadcast ratings 2, 4 and 5, the receiver can use length 2 Walsh codes to perform channel estimation on antenna ports 1 and 2 as shown in FIG. 5. Similarly, for transmission ratings 3 and 4, the receiver can use length 2 Walsh codes to perform channel estimation on antenna ports 3 and 4. When more than two layers are multiplexed into a CDM group, the OCC of length 4 should be used for channel estimation.
    [0035] For multi-user MIMO, user terminal 14 may not know if other user terminals 14 are co-programmed at the same time, such as when transparent MU-MIMO is used. This lack of knowledge forces each user terminal 14 to use OCC of length 4 for channel estimation even for lower classification, which can degrade performance a bit more, specifically for high speed cases. In order to exploit the advantage of length 2 OCC, it is proposed to introduce 1 bit OCC length flag in control signaling to provide user terminal 14 more information about OCC details, which can consequently improve performance in MU-MIMO. So, this 1-bit flag can also enable dynamic SU/MU switching.
    [0036] FIG. 6 illustrates an exemplified method 150 implemented by base station 12 for transmitting demodulation reference signals to a user terminal 14. When a user terminal 14 is programmed to receive a downlink transmission on the downlink shared channel (DL-SCH ), base station 12 determines the transmission classification for downlink transmission to user terminal 14 (block 152) and determines one or more reference signal antenna ports for downlink transmission based on the classification of the transmission (block 154). Transmit signal processor 130 at base station 12 is configured to map the antenna ports to a particular CDM group and coverage orthogonal code such that the CDM group and coverage orthogonal code are the same for a given antenna port for each broadcast rating. The transmit signal processor 130 maps the demodulation reference signal to the reference signal antenna ports (block 156) corresponding to the transmit rating and transmits the demodulation reference signals along selected antenna ports (block 158 ).
    [0037] FIG. 7 illustrates an exemplified procedure 160 implemented by a user terminal 14 for receiving downlink reference signals from base station 12. User terminal 14 determines the transmission classification for downlink transmission to the user terminal. block 162) and selects one or more reference signal antenna ports based on transmission rating (block 164). Receive signal processor 230 is configured to map the reference signal antenna ports to a CDM and OCC group such that the CDM and OCC group are the same for a given antenna port for each transmission rating (block 166) . Receive signal processor 230 receives the reference signals over selected antenna ports (block 168) and processes the signals.
    [0038] Antenna port mapping is applicable to both single-user MIMO and multi-user MIMO. It is also applicable to DwPTS and extended CPs, as well as multiple component carriers. The antenna port mapping scheme can be used to reduce the peak power randomization effect.
    [0039] The present invention can, of course, be performed in other specific ways than those presented, without abandoning the scope and essential characteristics of the invention. The present embodiments are therefore considered in all respects to be illustrative and not restrictive, and all changes within the range of meaning and equivalence of the appended claims are intended to be covered by this document.
    权利要求:
    Claims (16)
    [0001]
    1. Method (150) implemented by a base station for transmitting demodulation reference signals to a user terminal, characterized in that it comprises: determining (152) a transmission classification for a downlink transmission to said user terminal ; determining (154) one or more reference signal antenna ports for said downlink transmission based on said transmission classification, wherein each port is defined by a group/code pair comprising a code division multiplexing group and orthogonal coverage code; mapping (156) the reference signal antenna ports to group/code pairs for each transmission classification such that the code division multiplexing group and the coverage orthogonal code are the same for a given antenna port for each transmission classification; and transmitting (158) said downlink reference signals along said reference signal antenna ports corresponding to the transmission classification.
    [0002]
    2. Method (150) according to claim 1, characterized in that the mapping of antenna ports to group/code pairs is further configured such that, within a given code division multiplexing group, the ports Antenna ports associated with a low transmit rating will be a subset of the antenna ports associated with a higher transmit rating.
    [0003]
    3. Method (150) according to claim 3, characterized in that the orthogonal coverage codes comprise codes of length 4 and wherein the mapping of antenna ports to group/code pairs is further configured such that, for at selected antenna ports, orthogonal length 4 coverage codes can be decomposed into two length 2 coverage codes for channel estimation.
    [0004]
    4. Method (150) according to claim 2, further characterized in that it comprises sending a control signal to a user terminal to indicate whether the channel estimation should be performed using orthogonal length 2 coverage codes or of length 4 for the selected antenna ports.
    [0005]
    5. Method (160) implemented by a user terminal for receiving demodulation reference signals transmitted by a base station, characterized in that it comprises: determining (162) a transmission classification for a downlink transmission to said terminal of user; determining (164) one or more reference signal antenna ports for said downlink transmission based on said transmission classification, wherein each port is defined by a group/code pair comprising a code division multiplexing group and orthogonal coverage code; mapping (166) the reference signal antenna ports to group/code pairs for each transmission classification such that the code division multiplexing group and the coverage orthogonal code are the same for a given antenna port for each transmission classification; and receiving (168) said downlink demodulation reference signals along said reference signal antenna ports corresponding to the transmission classification.
    [0006]
    6. Method (160) according to claim 5, characterized in that the mapping of antenna ports to group/code pairs is further configured such that, within a code division multiplexing group, the ports Antenna ports associated with a low transmit rating will be a subset of the antenna ports associated with a higher transmit rating.
    [0007]
    7. Method (160) according to claim 5, characterized in that the orthogonal coverage codes comprise coverage codes of length 4 and wherein the mapping of antenna ports to group/code pairs is further configured such whereas, for selected antenna ports, the orthogonal length 4 coverage codes can be decomposed into two length 2 coverage codes for channel estimation.
    [0008]
    8. Method (160) according to claim 7, further characterized in that it comprises receiving a control signal from the base station and performing channel estimation using either length 2 or length 4 orthogonal coverage codes for the selected antenna ports depending on the control signal.
    [0009]
    9. Base station (12) adapted to transmit demodulation reference signals to a user terminal (14), the base station (12) characterized in that it is configured to: determine a transmission rating for a downlink transmission to said user terminal (14); determining one or more reference signal antenna ports for said downlink transmission based on said transmission classification, wherein each port is defined by a group/code pair comprising a code division multiplexing group and an orthogonal code coverage; mapping the reference signal antenna ports to group/code pairs such that the code division multiplexing group and the orthogonal coverage code are the same for a given antenna port for each transmission classification; and transmitting said downlink demodulation reference signals along said reference signal antenna ports corresponding to the transmission rating.
    [0010]
    10. Base station (12) according to claim 9, characterized in that it is further configured to map antenna ports to group/code pairs such that, within a given code division multiplexing group, the antenna ports associated with a low transmit rating will be a subset of the antenna ports associated with a higher transmit rating.
    [0011]
    11. Base station (12) according to claim 9, characterized in that the orthogonal coverage codes comprise coverage codes of length 4 and wherein the mapping of antenna ports to group/code pairs is additionally configured such that, for selected antenna ports, the orthogonal length 4 coverage codes can be decomposed into two length 2 coverage codes for channel estimation.
    [0012]
    12. Base station (12) according to claim 11, further characterized in that it is configured to send a control signal to a user terminal to indicate whether channel estimation should be performed using orthogonal coverage codes. length 2 or length 4 for selected antenna ports.
    [0013]
    13. User terminal (14), characterized in that it is adapted to receive demodulation reference signals transmitted by a base station, said user terminal (14) is configured to: determine a transmission classification for a transmission of downlink to said user terminal; determining one or more reference signal antenna ports for said downlink transmission based on said transmission classification, wherein each port is defined by a group/code pair comprising a code division multiplexing group and an orthogonal code coverage; mapping the reference signal antenna ports to group/code pairs such that the code division multiplexing group and the orthogonal coverage code are the same for a given antenna port for each transmission classification; and receiving said downlink demodulation reference signals along said reference signal antenna ports corresponding to transmission classification.
    [0014]
    14. User terminal (14) according to claim 13, characterized in that it is additionally configured to map antenna ports to group/code pairs such that, within a given code division multiplexing group, the antenna ports associated with a low transmit rating will be a subset of the antenna ports associated with a higher transmit rating.
    [0015]
    15. User terminal (14) according to claim 13, characterized in that the orthogonal coverage codes comprise coverage codes of length 4 and wherein the mapping of antenna ports to group/code pairs is additionally configured such that, for selected antenna ports, the orthogonal length 4 coverage codes can be decomposed into two length 2 coverage codes for channel estimation.
    [0016]
    16. User terminal (14) according to claim 15, characterized in that it is further configured to receive a control signal from the base station and perform channel estimation using orthogonal coverage codes of length 2 or of length 4 for selected antenna ports depending on control signal.
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    法律状态:
    2019-01-15| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-02-04| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-03-03| B15K| Others concerning applications: alteration of classification|Free format text: A CLASSIFICACAO ANTERIOR ERA: H04B 7/06 Ipc: H04W 72/04 (2009.01), H04W 72/06 (2009.01) |
    2021-03-30| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-06-08| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 20/01/2010, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF |
    优先权:
    申请号 | 申请日 | 专利标题
    PCT/CN2010/000084|WO2011088589A1|2010-01-20|2010-01-20|Antenna port mapping method and device for demodulation reference signals|
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