WO2011009371A1 - Procédé d'envoi d'un signal de référence de démodulation en liaison descendante, station de base et station de relais liée - Google Patents

Procédé d'envoi d'un signal de référence de démodulation en liaison descendante, station de base et station de relais liée Download PDF

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Publication number
WO2011009371A1
WO2011009371A1 PCT/CN2010/074850 CN2010074850W WO2011009371A1 WO 2011009371 A1 WO2011009371 A1 WO 2011009371A1 CN 2010074850 W CN2010074850 W CN 2010074850W WO 2011009371 A1 WO2011009371 A1 WO 2011009371A1
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WIPO (PCT)
Prior art keywords
reference signal
demodulation reference
relay
pdcch
transmitting
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PCT/CN2010/074850
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English (en)
Chinese (zh)
Inventor
吴栓栓
毕峰
袁明
梁枫
杨瑾
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中兴通讯股份有限公司
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Publication of WO2011009371A1 publication Critical patent/WO2011009371A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to a method, a base station, and a relay station for transmitting a downlink demodulation reference signal.
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • OFDM Orthogonal Frequency Division Multiplexing
  • communication resources are in the form of time-frequency two-dimensional.
  • uplink and downlink communication resources are divided in units of frames in the time direction.
  • Each radio frame has a length of 10 ms and includes 10 lengths of 1 ms.
  • Sub-frame as shown in Figure 1.
  • Each subframe contains two slots in the time direction.
  • Cyclic Prefix (CP) each subframe may contain 12 or 14 OFDM symbols.
  • CP Cyclic Prefix
  • the subframe uses the normal CP (Normal CP) length, the subframe contains 14 OFDM symbols, and each slot has 7 OFDM symbols.
  • the subframe When the subframe uses the extended CP (Extended CP) length, the subframe is within the subframe. Contains 12 OFDM symbols, each slot has 6 OFDM symbols. In the frequency direction, resources are divided into sub-carriers. Specifically, in communication, the smallest unit of resource allocation is a resource block (Resource Block, RB for short), and the corresponding physical resource is a physical resource block (Physical RB, referred to as PRB).
  • a PRB contains 12 subcarriers in the frequency domain, corresponding to one time slot in the time domain, and the same time in the same subframe. The two RBs adjacent to the domain are called RB pairs.
  • a resource corresponding to one subcarrier on each OFDM symbol is referred to as a Resource Element (RE).
  • RE Resource Element
  • the transmission of data is one more hop.
  • the original base-to-terminal communication mode becomes the communication mode of the base station-relay-terminal, wherein the base-relay link is called A relay link (backhaul link), a relay station-terminal link is called an access link.
  • a relay link backhaul link
  • a relay station-terminal link is called an access link.
  • some terminals access the relay station and complete communication services through the relay station.
  • the base station-relay station communication and the relay station-terminal communication are determined in a time division manner in the LTE-A system. Specifically, a part of the downlink subframe is used for base station-relay communication, and these subframes are used. It is called a Relay subframe.
  • the Relay subframe is indicated as a Multicast Broadcast Single Frequency Network (MBSFN) subframe, so that the Rel-8 terminal can skip these subframes and complete Base station-relay communication ensures backward compatibility with Rel-8 terminals.
  • MMSFN Multicast Broadcast Single Frequency Network
  • the structure of the relay subframe is as shown in FIG. 2.
  • the RN sends control information to the subordinate terminal in the first 1 or 2 OFDM symbols, and then passes the transition time interval from the transmission state to the reception state, and then receives the relay link downlink data information from the base station, and finally The transition interval from the reception state to the transmission state is then passed.
  • the PRB described in the present invention includes the number of effective symbols that the base station transmits data to the relay station in one subframe in the time domain.
  • a relay-physical downlink shared channel (R-PDSCH) and/or a control channel, that is, a relay physical downlink control channel (Relay-Physical) will be included.
  • the Downlink Control Channel (referred to as R-PDCCH), where the R-PDCCH carries the downlink control data of the relay link, and the R-PDSCH carries the downlink service data of the relay link.
  • precoding will be performed before downlink traffic data transmission. Considering the characteristics of the control channel data transmission, the pre-coding may not be performed before the downlink control data transmission.
  • the R-PDCCH may be carried in units of PRBs (where PRBs refer to PRB pairs), and R-PDSCH is multiplexed by frequency division; or carried by partial OFDM symbols, and R - PDSCH is multiplexed in a time division manner; or carried in part of a frequency resource within a partial OFDM symbol in a Relay subframe, so-called time-frequency division multiplexing.
  • the pre-processing manner of the downlink control data and the service data transmission of the relay link may be different, that is, the data of the R-PDCCH may not be pre-coded (but the data pre-processing method of the transmit diversity may be adopted), R- The PDSCH data is precoded.
  • the corresponding demodulation R-PDCCH and R-PDSCH reference signals will also have different processing modes.
  • the discussion on the transmission method of the Relay Demodulation Reference Signal (DMRS) of the Relay Trunk Link in the LTE-A system is still a blank.
  • DMRS Relay Demodulation Reference Signal
  • the technical problem to be solved by the present invention is to provide a method for transmitting a downlink demodulation reference signal, a base station, and a relay station, and to solve the corresponding solutions when R-PDCCH and R-PDSCH are transmitted by different multiplexing modes and different data preprocessing modes. Adjust the transmission of the reference signal.
  • the present invention provides a method for transmitting a downlink demodulation reference signal, which is applied to a relay link, and the method includes: when a base station sends downlink control data of a relay link to a relay station, the first solution is simultaneously Transmitting the reference signal to the relay station; and transmitting, by the base station, the downlink link service data to the relay station, and simultaneously transmitting the second demodulation reference signal to the relay station; wherein, the relay link downlink control data bearer And a relay physical downlink control channel (R-PDCCH), where the downlink information of the relay link is carried on a relay physical downlink shared channel (R-PDSCH); the first demodulation reference signal is a non-precoded reference signal , coherent demodulation for downlink control data of the relay link; The second demodulation reference signal is precoded together with the downlink information of the relay link before being transmitted, and is used for coherent demodulation of the downlink service data of the relay link.
  • R-PDCCH relay physical downlink control channel
  • the method further includes: the base station mapping the first demodulation reference signal to a physical resource occupied by the downlink control data of the relay link in.
  • the physical resource is a physical resource block, that is, a physical resource block pair, or the physical resource is all frequency resources in an Orthogonal Frequency Division Multiplexing (OFDM) symbol, or the physical resource is a partial frequency resource in an OFDM symbol.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the method further includes: when the R-PDCCH and the R-PDSCH are multiplexed in The base station maps the first demodulation reference signal and the second demodulation reference signal to the physical resource block pair respectively when the physical resource block is transmitted in a pair; wherein, the second demodulation reference signal is only And mapping the physical location of the physical resource block to the inner R-PDSCH, or mapping the second demodulation reference signal to the entire physical resource block pair.
  • the method further includes: when the R-PDCCH and the R-PDSCH are multiplexed in When a physical resource block is transmitted in a pair, and the number of OFDM symbols occupied by the R-PDCCH is variable, the base station maps the first demodulation reference signal and the second demodulation reference signal to the physical resource block pair respectively.
  • the mapping position of the first demodulation reference signal is all physical resources available to the inner R-PDCCH of the physical resource block, or the mapping position of the first demodulation reference signal
  • the first demodulation reference signal and the second demodulation reference signal are orthogonal to each other, and the orthogonal manner is: time division multiplexing or frequency division multiplexing or a combination of time division multiplexing and frequency division multiplexing.
  • the method further includes: when the R-PDCCH and the R-PDSCH are multiplexed in When a physical resource block is transmitted in a pair, and the R-PDCCH and the R-PDSCH respectively occupy different OFDM symbols in the same PRB pair, the slot boundary is a boundary between the R-PDCCH and the R-PDSCH;
  • the first demodulation reference signal is mapped in a physical resource occupied by the R-PDCCH
  • the second demodulation reference signal is mapped in a physical resource occupied by the R-PDSCH.
  • the first demodulation reference signal corresponds to an antenna port that is sent by the R-PDCCH
  • the demodulation reference signals corresponding to the antenna ports are orthogonal to each other.
  • the second demodulation reference signal corresponds to the number of layers sent by the R-PDSCH, and the demodulation reference signals corresponding to the respective layers are orthogonal to each other.
  • the first demodulation reference signal is orthogonal to the common reference signal; and mapping is performed in a physical resource that transmits the R-PDSCH
  • the second demodulation reference signal is orthogonal to the common reference signal.
  • the orthogonal manner is: one or a combination of time division multiplexing, frequency division multiplexing, and code division multiplexing.
  • the method further includes: the relay station according to the received first demodulation And demodulating the relay link downlink control data according to the reference signal, and demodulating the relay link downlink service data according to the received second demodulation reference signal.
  • the present invention further provides a base station, including: a processing module, configured to: generate a first demodulation reference signal and a second demodulation parameter of a relay link The test signal, wherein: the first demodulation reference signal is a non-precoded reference signal, and is used for coherent demodulation of downlink control data of the relay link; before the second demodulation reference signal is transmitted and the downlink of the relay link The service data is precoded together for coherent demodulation of downlink traffic data of the relay link; and the transmitting module is configured to: send the first demodulation reference signal and the second demodulation reference signal.
  • a processing module configured to: generate a first demodulation reference signal and a second demodulation parameter of a relay link The test signal, wherein: the first demodulation reference signal is a non-precoded reference signal, and is used for coherent demodulation of downlink control data of the relay link; before the second demodulation reference signal is transmitted and the downlink of the relay link The service data is precoded together for coherent
  • the present invention further provides a relay station, comprising: a receiving module, configured to: receive a first demodulation reference signal and a second demodulation reference signal of a relay link; and a processing module, the setting And: demodulating the relay link downlink control data according to the first demodulation reference signal; and demodulating the relay link downlink service data according to the second demodulation reference signal.
  • the method for mapping demodulation reference signals and the base station and the relay station solves different data preprocessing methods for R-PDCCH and R-PDSCH, and demodulation reference in different multiplexing modes.
  • the relay station uses the demodulation reference signal to perform coherent demodulation of the R-PDCCH and the R-PDSCH, respectively, to ensure the reliability of the R-PDCCH and the R-PDSCH data transmission.
  • the relay link has a Cell-specific Reference Signal (CRS)
  • CRS Cell-specific Reference Signal
  • the demodulation reference signal described in the present invention does not interfere with the CRS, thereby avoiding the impact on the terminal.
  • FIG. 1 is a schematic diagram of a frame structure of an LTE/LTE-A system
  • FIG. 2 is a schematic diagram of a structure of a Relay sub-frame
  • FIG. 3 is a schematic diagram of a method for transmitting a downlink demodulation reference signal of a relay link according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a second demodulation reference signal mapping of the application example 1 of the present invention
  • FIG. 6 is a first and second demodulation of the application example 2 of the present invention
  • 7 is a schematic diagram of first and second demodulation reference signal mappings of Application Example 3 of the present invention
  • FIG. 8 is a schematic diagram of first and second demodulation reference signal mappings of Application Example 4 of the present invention
  • FIG. Figure 10 is a schematic diagram of an embodiment of a relay station of the present invention
  • Figure 11 is a schematic diagram of mapping of first and second demodulation reference signals of Application Example 5 of the present invention.
  • the LTE-A system Relay related technology discussion does not involve the relay link downlink control channel R-PDCCH and the relay link downlink traffic channel R-PDSCH.
  • the corresponding demodulation reference is used when different preprocessing methods and different multiplexing modes are used. Signal transmission problem.
  • Embodiments of the present invention provide a method for transmitting a downlink demodulation reference signal of a relay link.
  • the processing principle of the method is: dividing the relay link downlink demodulation reference signal into a first demodulation reference signal and a second demodulation reference signal, where the first demodulation reference signal is not pre-coded, and is used for R-PDCCH Coherent demodulation, that is, the first demodulation reference signal is a non-precoded reference signal, and is used for coherent demodulation of downlink control data of the relay link; and the second demodulation reference signal is pre-combined with downlink service data of the relay link. Coding for coherent demodulation of R-PDSCH.
  • the second demodulation reference signal is precoded together with the relay link downlink service data before transmission, and is used for coherent demodulation of the downlink data of the relay link.
  • Step 301 The base station generates a first demodulation reference signal and a second demodulation reference signal.
  • the specific mapping manner of the first demodulation reference signal and the second demodulation reference signal is related to the multiplexing manner of the R-PDCCH and the R-PDSCH.
  • the multiplexing method of the R-PDCCH and the R-PDSCH may be a split mode, a frequency division scheme, or a time-frequency division scheme.
  • the time division mode means that the R-PDCCH and the R-PDSCH respectively occupy different OFDM symbols, that is, multiplexed in the same PRB (here, the PRB is a PRB pair);
  • the frequency division mode refers to the R-PDCCH and the R-PDCCH.
  • the PDSCH occupies different PRB pairs respectively.
  • the time-frequency division multiplexing means that in the downlink physical resources of the relay link, the R-PDCCH and the R-PDSCH can be multiplexed in a part of the PRB pair of the relay link.
  • the first demodulation reference signal is not precoded, and corresponds to the antenna port sent by the R-PDCCH, and the demodulation reference signals of the respective ports are orthogonal to each other; the second demodulation reference signal is precoded together with the downlink service downlink data.
  • the demodulation reference signals of the respective layers are orthogonal to each other.
  • the first demodulation reference signal and the second demodulation reference signal are both orthogonal to the CRS.
  • the orthogonal method mentioned here may be one of Time Division Multiplexing (TDM) or Frequency Division Multiplexing (FDM) or Code Division Multiplexing (CDM). Combination of species or several.
  • TDM Time Division Multiplexing
  • FDM Frequency Division Multiplexing
  • CDM Code Division Multiplexing
  • Step 302 When the base station sends the relay link downlink control data to the relay station, the first demodulation reference signal is simultaneously sent to the relay station; and when the base station sends the downlink link downlink service data to the relay station, the second solution is also The tone reference signal is sent to the relay station; in one downlink relay subframe, there may be both R-PDCCH and R-PDSCH, or only R-PDCCH, or only R-PDSCH.
  • the base station When the R-PDCCH and the R-PDSCH are coexisting, the base station carries the first demodulation reference signal and the second demodulation reference signal simultaneously in the signal sent by the relay link; when only the R-PDCCH, the base station is in the relay The signal sent by the link carries the first demodulation reference signal, and does not need to carry the second demodulation reference signal; when only the R-PDSCH is available, the base station carries the second demodulation reference signal in the signal transmitted in the relay link. , there is no need to carry the first demodulation reference signal.
  • Step 303 The relay station receives a relay link downlink signal carrying the first demodulation reference signal and/or the second demodulation reference signal.
  • the relay station After receiving the first demodulation reference signal and the second demodulation reference signal, the relay station performs coherent demodulation on the R-PDCCH according to the received first demodulation reference signal, and according to the received second demodulation reference signal pair R- The PDSCH performs coherent demodulation.
  • the implementation process of the invention will be described in detail below with reference to application examples. In the following application example, it is assumed that one base station and several relay stations are included in one cell in the LTE-A system, and the relay station receives the data transmitted by the base station by using the MBSFN subframe in the relay node cell, that is, receiving the relay link for the relay station.
  • the relay station For the subframe of the downlink data, the relay station indicates to the Rel-8 terminal in the own cell that the subframe is an MBSFN subframe. It is assumed that the subframe in which the base station transmits data to the relay station uses a normal cyclic prefix length (Normal CP), which includes a total of 14 OFDM symbols, and assumes that the relay station receives the downlink position of the relay link downlink data as the fourth OFDM symbol, and receives The end position is the 13th OFDM symbol.
  • Normal CP normal cyclic prefix length
  • the relay link resource corresponding to a PRB pair size in the frequency domain is shown in FIG. 4. Each small square in the figure represents a resource element (RE element), and the relay station receives the physical data of the downlink data of the relay link.
  • the location of the resource is shown in the square of the dot in the figure.
  • the position of the CRS of the four ports is shown by the position indicated by the slashed square in the figure. If the base station transmits data to the relay station using the MBSFN subframe of the own cell, there will be no CRS in the 4th to 13th OFDM symbols.
  • the R-PDCCH and the R-PDSCH are multiplexed in the downlink physical resource of the relay link by means of frequency division, that is, the R-PDCCH and the R-PDSCH respectively occupy different PRB pairs.
  • the R-PDCCH and the R-PDSCH in the same PRB pair do not exist at the same time.
  • the first demodulation reference signal and the second demodulation reference signal are respectively mapped in the PRB pair occupied by the R-PDCCH and the R-PDSCH, and are only mapped in the PRB pair occupied by the R-PDCCH and the R-PDSCH.
  • the first demodulation reference signal corresponds to the antenna port of the R-PDCCH transmission, and the reference signals of the respective ports are orthogonal to each other;
  • the second demodulation reference signal corresponds to the number of layers of the R-PDSCH transmission, and the reference signals of the respective layers are orthogonal to each other.
  • the patterns of the first demodulation reference signal and the second demodulation reference signal are both orthogonal to the pattern of the CRS.
  • the orthogonal mode here may be one of TDM, FDM or CDM or a combination of several.
  • FIG. 5 it is a schematic diagram of a mapping pattern of the second demodulation reference signal.
  • the second demodulation reference signal is a multiplexing mode of TDM/FDM/CDM mixing.
  • Figure 2 depicts the second demodulation reference signal, two layers of TDM combined with FDM transmission.
  • CDM can be used. Reuse different layers.
  • a Walsh code of length 2 is used for spreading in two pilot REs adjacent in the frequency domain, and two layers can be multiplexed, so that four second demodulation reference signals can be obtained. , corresponding to the 4-layer transmission of R-PDSCH.
  • the base station transmits data to the relay station using the MBSFN subframe of the own cell, the CRS in the R-PDSCH will not exist.
  • a pattern for the first demodulation reference signal can also be obtained similarly. It should be understood that the illustrations of the first demodulation reference signal and the second demodulation reference signal described herein are merely illustrative of the invention and are not intended to unduly limit the invention.
  • the R-PDCCH and the R-PDSCH may be multiplexed in the same PRB pair, and the R-PDCCH and the R-PDSCH respectively occupy different OFDM symbols in the same PRB pair.
  • the R-PDCCH occupies at least 3 OFDM symbols, occupying at most 4 OFDM symbols, and the R-PDSCH occupies the remaining OFDM symbols.
  • the first demodulation reference signal can only be mapped in the physical resource occupied by the R-PDCCH, and the second demodulation reference signal can only be mapped in the physical resource occupied by the R-PDSCH.
  • the first demodulation reference signal is mapped according to the case that the number of OFDM symbols that the R-PDCCH may occupy is the smallest, that is, in this example, only the first three OFDM symbols in the resource that the base station transmits data to the relay station may be mapped.
  • the second demodulation reference signal is also mapped according to the case where the number of OFDM symbols that the R-PDSCH may occupy is the smallest, that is, in this example, it can only be mapped in the last 6 OFDM of the resources that the base station transmits data to the relay station.
  • FIG. 6 is a schematic diagram of a first demodulation reference signal and a second demodulation reference signal mapping pattern. The first demodulation reference signal and the second demodulation reference signal are respectively represented by different filling shapes, as shown in FIG. 6. If the base station transmits data to the relay station using the MBSFN subframe of the own cell, the CRS in the R-PDCCH and the R-PDSCH will not exist.
  • the application example further includes that the first demodulation reference signal corresponds to an antenna port of the R-PDCCH transmission, and the reference signals of the respective ports are orthogonal to each other; the second demodulation reference signal corresponds to the number of layers of the R-PDSCH transmission, and each layer is The reference signals are orthogonal to each other. And when the base station transmits data to the relay station When there is a CRS in the resource, the patterns of the first demodulation reference signal and the second demodulation reference signal are both orthogonal to the pattern of the CRS.
  • the orthogonal manner here may be one of TDM, FDM or CDM or a combination of several.
  • the distribution of the first demodulation reference signal and the second demodulation reference signal in the PRB is only schematically illustrated in FIG. 6, and does not reflect the first demodulation reference signal and the antenna port when the R-PDCCH multi-antenna is transmitted. Correspondence relationship, and also does not reflect the correspondence between the second demodulation reference signal and the number of layers in the R-PDSCH multilayer transmission. It should be understood that the illustrations of the first demodulation reference signal and the second demodulation reference signal described herein are merely illustrative of the invention and are not intended to unduly limit the invention.
  • the R-PDCCH and the R-PDSCH may be multiplexed in the same PRB pair, and the R-PDCCH and the R-PDSCH respectively occupy different OFDM symbols in the same PRB.
  • the R-PDCCH occupies at least 3 OFDM symbols, and occupies at most 4 OFDM symbols, and the R-PDSCH occupies the remaining OFDM symbols.
  • the first demodulation reference signal can only be mapped in the physical resources occupied by the R-PDCCH, and the second demodulation reference signal can be mapped in all possible physical resources in the PRB pair in which the R-PDSCH exists.
  • the first demodulation reference signal is mapped according to the case that the number of OFDM symbols that the R-PDCCH may occupy is the smallest, that is, in this example, only the first three OFDM symbols in the resource that the base station transmits data to the relay station may be mapped.
  • the second demodulation reference signal is mapped according to the situation in which the resources in the PRB pair of the base station transmitting data to the relay station are occupied by the R-PDSCH, that is, in this example, the available resources of all the OFDM symbols transmitted by the base station to the relay station can be mapped.
  • Fig. 7 is a schematic diagram showing a mapping pattern of the first demodulation reference signal and the second demodulation reference signal.
  • the first demodulation reference signal and the second demodulation reference signal are respectively represented by different filling shapes. If the base station transmits data to the relay station using the MBSFN subframe of the own cell, the CRS in the R-PDCCH and the R-PDSCH will not exist.
  • the application example further includes: an antenna port pair of the first demodulation reference signal and the R-PDCCH transmission
  • the reference signals of the respective ports are orthogonal to each other;
  • the second demodulation reference signal corresponds to the number of layers of the R-PDSCH transmission, and the reference signals of the respective layers are orthogonal to each other.
  • the patterns of the first demodulation reference signal and the second demodulation reference signal are orthogonal to each other, and when the CRS exists in the resource for transmitting data by the base station to the relay station, the patterns of the first demodulation reference signal and the second demodulation reference signal are both
  • the pattern of the CRS is orthogonal.
  • the orthogonal manner here may be one of TDM, FDM or CDM or a combination of several.
  • the application example further includes: when mapping the first demodulation reference signal and the second demodulation reference signal according to the method in this example, the relay station may obtain the second demodulation reference signal occupied in the R-PDCCH region before detecting the R-PDCCH information.
  • the resource location such that the relay station can eliminate the RE occupied by the second demodulation reference signal in the R-PDCCH region when the R-PDCCH is blindly detected, and avoid the influence of the second demodulation reference signal on the blind detection of the R-PDCCH. It should be noted that the distribution of the first demodulation reference signal and the second demodulation reference signal in the PRB pair is only schematically illustrated in FIG.
  • the R-PDCCH and the R-PDSCH may be multiplexed in the same PRB pair, and the R-PDCCH and the R-PDSCH respectively occupy different OFDM symbols in the same PRB.
  • the number of OFDM symbols occupied by the R-PDCCH is adjusted according to the data amount of the R-PDCCH in the resource that the base station transmits data to the relay station, and may be 1 or 2 or 3 or 4 OFDM symbols, R-PDSCH. Occupy the remaining OFDM symbols.
  • mapping position of the first demodulation reference signal takes into account both the R-PDCCH and the occupied position.
  • the first demodulation reference signal is mapped in the first and third OFDM symbols in the PRB pair of the R-PDCCH transmitted by the base station to the relay station.
  • the second demodulation reference signal is in accordance with the PRB alignment of the base station transmitting data to the relay station.
  • the resources are all mapped by the R-PDSCH occupation, that is, in this example, the available resources of all OFDM symbols transmitted by the base station to the relay station can be mapped.
  • FIG. 8 is a schematic diagram of a first demodulation reference signal and a second demodulation reference signal mapping pattern.
  • the first demodulation reference signal and the second demodulation reference signal are respectively represented by different filling shapes.
  • the base station transmits data to the relay station using the MBSFN subframe of the own cell
  • the CRS in the R-PDCCH and the R-PDSCH will not exist.
  • the R-PDCCH occupies 2 OFDM symbols in its transmitted PRB pair
  • the R-PDSCH occupies the remaining OFDM symbols.
  • the application example further includes that the first demodulation reference signal corresponds to an antenna port of the R-PDCCH transmission, and the reference signals of the respective ports are orthogonal to each other; the second demodulation reference signal corresponds to the number of layers of the R-PDSCH transmission, and each layer is The reference signals are orthogonal to each other.
  • the patterns of the first demodulation reference signal and the second demodulation reference signal are both orthogonal to the pattern of the CRS.
  • the orthogonal manner may be one of TDM, FDM or CDM or a combination of several.
  • the application example further includes: when mapping the first demodulation reference signal and the second demodulation reference signal according to the method in this example, the relay station may obtain the second demodulation reference signal occupied in the R-PDCCH region before detecting the R-PDCCH information.
  • the resource location such that when the relay station blindly detects the R-PDCCH, the RE occupied by the second demodulation reference signal in the R-PDCCH region can be eliminated, and the influence of the second demodulation reference signal on the blind detection of the R-PDCCH is avoided.
  • the distribution of the first demodulation reference signal and the second demodulation reference signal in the PRB pair is only schematically illustrated in FIG. 8, and does not reflect the first demodulation reference signal and the antenna when the R-PDCCH multi-antenna is transmitted.
  • the correspondence between the ports and the correspondence between the second demodulation reference signal and the number of layers in the R-PDSCH multilayer transmission It should be understood that the illustrations of the first demodulation reference signal and the second demodulation reference signal described herein are merely illustrative of the invention and are not intended to unduly limit the invention.
  • Application Example 5 Assume that in a LTE-A system, one cell includes one base station and several relay stations, and the relay station uses the MBSFN subframe in the relay node cell to receive data transmitted by the base station, that is, for the relay station. In the subframe in which the downlink data of the relay link is received, the relay station indicates to the Rel-8 terminal in the own cell that the subframe is an MBSFN subframe. It is assumed that the subframe in which the base station transmits data to the relay station uses a normal cyclic prefix length (Normal CP), and includes a total of 14 OFDM symbols, and assumes that the relay station receives the downlink position of the relay link downlink data as the fourth OFDM symbol or more.
  • Normal CP normal cyclic prefix length
  • the received end position is the 13th or 14th OFDM symbol.
  • the relay link resources corresponding to one PRB pair size in the frequency domain are still as shown in FIG. 4, and the start and end OFDM symbol positions received by the relay station in the figure are the 4th and 13th OFDM symbols, respectively.
  • the R-PDCCH and the R-PDSCH may be multiplexed in the same PRB pair, and the R-PDCCH and the R-PDSCH respectively occupy different OFDM symbols in the same PRB pair, with the slot boundary being R- The boundary between PDCCH and R-PDSCH.
  • the R-PDCCH start symbol is the fourth OFDM symbol
  • the end symbol of the R-PDSCH is the 14th OFDM symbol.
  • the first demodulation reference signal can only be mapped in the physical resource occupied by the R-PDCCH
  • the second demodulation reference signal can only be mapped in the physical resource occupied by the R-PDSCH.
  • FIG. 11 is a schematic diagram showing a mapping pattern of a first demodulation reference signal and a second demodulation reference signal.
  • the first demodulation reference signal and the second demodulation reference signal are respectively represented by different filling shapes. If the base station transmits data to the relay station using the MBSFN subframe of the own cell, the CRS in the R-PDCCH and the R-PDSCH will not exist.
  • the application example further includes that the first demodulation reference signal corresponds to an antenna port of the R-PDCCH transmission, and the reference signals of the respective ports are orthogonal to each other; the second demodulation reference signal corresponds to the number of layers of the R-PDSCH transmission, and each layer is The reference signals are orthogonal to each other. And when the CRS exists in the resource that the base station transmits data to the relay station, the patterns of the first demodulation reference signal and the second demodulation reference signal are both orthogonal to the pattern of the CRS.
  • the orthogonal manner here may be one of TDM, FDM or CDM or a combination of several.
  • the distribution of the first demodulation reference signal and the second demodulation reference signal in the PRB is only schematically illustrated in FIG. 11, and does not reflect the first demodulation reference signal and the antenna port when the R-PDCCH multi-antenna is transmitted. Correspondence, and does not reflect the second solution of R-PDSCH multi-layer transmission Adjust the correspondence between the reference signal and the number of layers. It should be understood that the illustrations of the first demodulation reference signal and the second demodulation reference signal described herein are merely illustrative of the invention and are not intended to unduly limit the invention.
  • FIG. 9 is a block diagram showing the structure of a base station of the present invention. As shown in FIG. 9, the apparatus includes a processing module 92 and a transmitting module 94.
  • the processing module 92 is configured to: generate a first demodulation reference signal and a second demodulation reference signal of the relay link, where the first demodulation reference signal is not pre-coded, for coherent demodulation of the R-PDCCH, and second The demodulation reference signal is precoded together with the relay link downlink service data for coherent demodulation of the R-PDSCH; the transmitting module 94 is connected to the processing module 92, and the transmitting module 94 is set to: the transmission processing module 92 generates a first demodulation reference signal and a second demodulation reference signal of the relay link.
  • FIG. 10 is a block diagram showing the structure of a relay station of the present invention.
  • the apparatus includes a receiving module 102 and a processing module 104.
  • the receiving module 102 is configured to: receive the relay link first demodulation reference signal and the second demodulation reference signal;
  • the processing module 104 is connected to the receiving module 102, and the processing module 104 is configured to: according to the first demodulation reference signal, Demodulating the relay link downlink control data; and demodulating the relay link downlink service data according to the second demodulation reference signal.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module.
  • the invention is not limited to any particular hardware and software. Piece combination.
  • the invention may, of course, be embodied in various other forms and modifications without departing from the spirit and scope of the invention.
  • the present invention solves the problem of different preprocessing methods for R-PDCCH and R-PDSCH, and mapping of demodulation reference signals in different multiplexing modes. And when there is CRS in the relay link, the demodulation reference signal described in the present invention does not interfere with the CRS, and the influence on the terminal is avoided.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un procédé d'envoi du signal de référence de démodulation de liaison descendante (DMRS), appliqué à une liaison terrestre. Ledit procédé comprend les opérations suivantes : lors de l'envoi des données de commande de liaison descendante de la liaison terrestre à une station de relais (RS), la station de base (BS) adresse simultanément un premier DMRS à ladite station de relais; et lors de l'envoi des données de service de liaison descendante de la liaison terrestre à la RS, la BS adresse simultanément un second DMRS à ladite RS; parmi ceux-ci, ledit premier DMRS est un signal de référence de non-précodage pour la démodulation cohérente des données de commande de liaison descendante de la liaison terrestre; ledit second DMRS est précodé par les données de service de liaison descendante de la liaison terrestre avant d'être adressé, et le second DMRS est utilisé pour la démodulation cohérente des données de service de liaison descendante de la liaison terrestre. L'invention porte également sur une station de base et sur une station de relais. L'invention résout les problèmes d'utilisation de modes de prétraitement différents sur un canal de commande de liaison descendante physique de relais (R- PDCCH) et un canal partagé de liaison descendante physique de relais (R-PDSCH), et le mappage des DMRS dans des modes de multiplexage différents.
PCT/CN2010/074850 2009-07-22 2010-06-30 Procédé d'envoi d'un signal de référence de démodulation en liaison descendante, station de base et station de relais liée WO2011009371A1 (fr)

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