CN101964676B - Method and base station for sending relay link downlink demodulation reference signal and relay station - Google Patents
Method and base station for sending relay link downlink demodulation reference signal and relay station Download PDFInfo
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Abstract
The invention discloses a method and a base station for sending a relay link downlink demodulation reference signal and a relay station. The method comprises the following steps that: when sending relay link downlink control data to the relay station, the base station sends a first demodulation signal to the relay station at the same time; and when sending the relay link downlink service data to the relay station, the base station sends a second demodulation reference signal to the relay station at the same time, wherein the first demodulation reference signal is not pre-coded and is used for coherent demodulation of a relay-physical downlink control channel (R-PDCCH) and the second demodulation reference signal is pre-coded together with the relay link downlink service data before being sent and is used for the coherent demodulation of a relay-physical downlink shared channel (R-PDSCH). The method solves the problem of sending a corresponding modulation reference signal when the R-PDCCH and the R-PDSCH are sent by different multiplexing methods and different data pretreatment methods, so that the reliability of data transmission of the R-PDCCH and the R-PDSCH is guaranteed.
Description
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a method for sending a downlink demodulation reference signal of a relay link, a base station, and a relay station.
Background
Currently, the development requirement of mobile communication is to support higher transmission rate, more perfect signal coverage and higher resource utilization. In order to achieve high transmission rate, the next generation mobile communication system will use a higher frequency bandwidth to transmit signals, and the higher frequency bandwidth will bring larger path loss at the same time, affecting network coverage. Relay (Relay) technology can increase coverage and balance and increase cell throughput, and Relay Nodes (RNs) have relatively smaller configuration cost than base stations, so Relay is regarded as a key technology in an LTE-Advanced (LTE-a) system, which is an evolved system of Long Term Evolution (Long Term Evolution).
Both LTE and LTE-a systems are based on Orthogonal Frequency Division Multiplexing (OFDM) technology. In an OFDM system, the communication resources are in the form of two dimensions, time-frequency. For example, in the LTE system, the uplink and downlink communication resources are divided in time direction by frame (frame), each radio frame (radio frame) has a length of 10ms, and includes 10 subframes (sub-frames) with a length of 1ms, as shown in fig. 1. Each subframe may include 12 or 14 OFDM symbols according to a Cyclic Prefix (CP) length. In the frequency direction, resources are divided in units of subcarriers, specifically, in communication, a minimum unit of Resource allocation is a Resource Block (RB), and a corresponding Physical Resource is a Physical RB (PRB). One PRB includes 12 subcarriers in the frequency domain.
After the introduction of the relay station, the communication mode of the original base station-terminal is changed into the communication mode of the base station-relay station-terminal, taking a two-hop system as an example, where the base station-relay station link is called a relay link (backhaul link) and the relay station-terminal link is called an access link (access link). In the multi-hop system, a part of terminals are accessed to the relay station, and communication service is completed through the relay station. After the relay station is introduced into the LTE-a system, it is necessary to ensure backward compatibility with respect to the terminal, that is, it is necessary to ensure that a terminal of a previous version (for example, LTE Release-8, Rel-8) can also be accessed to the relay station, and at this time, it is necessary to partition a part of resources to ensure communication between the base station and the relay station on the premise of not affecting communication of terminals under the relay station.
Taking LTE-a system as an example, it is currently determined in LTE-a system that base station-Relay station communication and Relay station-terminal communication are performed in a time division manner, and specifically, a part of downlink subframes is divided for base station-Relay station communication, and these subframes are called Relay subframes. For a Rel-8 terminal under a Relay station, a Relay subframe is indicated as an MBSFN (Multicast Broadcast Single Frequency Network, MBSFN for short) subframe, so that the Rel-8 terminal can skip the subframes, and backward compatibility of the Rel-8 terminal is ensured while base station-Relay station communication is completed. In the LTE-a system, the structure of a Relay subframe is shown in fig. 2.
In the Relay subframe, the RN transmits control information to the subordinate terminal in the first 1 or 2 OFDM symbols, then passes through a transition time interval of switching from a transmission state to a reception state, receives Relay link downlink data information from the base station, and finally passes through a transition interval of switching from the reception state to the transmission state. In the invention, only the effective resources of the data transmitted from the base station to the Relay station in the Relay subframe are concerned, and the PRB described in the invention contains the effective symbol number of the data transmitted from the base station to the Relay station in one subframe in the time domain. In the Relay subframe, a Relay-Physical Downlink Shared Channel (R-PDSCH) and/or a Control Channel (R-PDCCH) from the base station to the Relay station are/is included, where the R-PDCCH carries Downlink Control data of the Relay link and the R-PDSCH carries Downlink traffic data of the Relay link. In the LTE-a system, Precoding (Precoding) is performed before downlink traffic data transmission. In consideration of the characteristics of data transmission of the control channel, precoding is not performed before downlink control data transmission.
In an LTE-A system, R-PDCCH is possibly carried by taking PRB as a unit, and R-PDSCH is multiplexed in a frequency division mode; or the OFDM signal is loaded by partial OFDM symbols and is multiplexed with the R-PDSCH in a time division mode; or carried in part of frequency resources within part of the OFDM symbols in the Relay subframe, so-called time-frequency division multiplexing. For these 3 different multiplexing schemes, 3 different types of PRBs will result: only R-PDCCH is in PRB; only R-PDSCH in PRB; the R-PDCCH and the R-PDSCH are multiplexed in the same PRB.
Moreover, the relay link downlink control data and the service data may be transmitted in different preprocessing manners, that is, the data of the R-PDCCH is not precoded (but may adopt a data preprocessing manner of transmit diversity), and the data of the R-PDSCH is precoded. Therefore, for different multiplexing modes and data preprocessing modes of the R-PDCCH and the R-PDSCH, the reference signals of the corresponding demodulated R-PDCCH and R-PDSCH will have different processing modes. At present, a discussion about a method for transmitting a Relay link downlink Demodulation Reference Signal (DMRS) in an LTE-a system is still blank.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for sending a downlink demodulation reference signal of a relay link, a base station and a relay station, and solve the problem of sending the corresponding demodulation reference signal when an R-PDCCH and an R-PDSCH are sent by adopting different multiplexing modes and different data preprocessing modes.
In order to solve the above technical problem, the present invention provides a method for transmitting a downlink demodulation reference signal of a relay link, including:
when the base station sends the downlink control data of the relay link to the relay station, the base station sends a first demodulation reference signal to the relay station at the same time; when the base station sends the downlink service data of the relay link to the relay station, the base station sends a second demodulation reference signal to the relay station at the same time;
wherein,
the relay link downlink control data is carried in a relay physical downlink control channel R-PDCCH,
the relay link downlink service data is carried in a relay physical downlink shared channel R-PDSCH,
the first demodulation reference signal is not precoded and is used for coherent demodulation of the R-PDCCH;
precoding the second demodulation reference signal together with downlink service data of a relay link before sending the second demodulation reference signal for coherent demodulation of the R-PDSCH;
when the R-PDCCH and the R-PDSCH are multiplexed and transmitted in one physical resource block, the base station respectively maps the first demodulation reference signal and the second demodulation reference signal in the physical resource block, wherein the second demodulation reference signal is only mapped in physical resources occupied by the R-PDSCH in the physical resource block, or the mapping position of the second demodulation reference signal is the whole physical resource block.
Further, the above transmission method may also have the following features:
and the base station maps the first demodulation reference signal in the physical resource occupied by the R-PDCCH and then sends the first demodulation reference signal to a relay station.
Further, the above transmission method may also have the following features:
the physical resource is a physical resource block, or
The physical resources are all frequency resources in the OFDM symbol, or
The physical resource is a part of frequency resource in the OFDM symbol.
Further, the above transmission method may also have the following features:
when the R-PDCCH and the R-PDSCH are multiplexed and transmitted in one physical resource block, the first demodulation reference signal and the second demodulation reference signal are mutually orthogonal, and the orthogonal mode is as follows: time division multiplexing or frequency division multiplexing or a combination of both.
Further, the above transmission method may also have the following features:
when the base station sends a first demodulation reference signal, the first demodulation reference signal corresponds to the antenna port sent by the R-PDCCH, and the demodulation reference signals corresponding to the antenna ports are orthogonal to each other.
Further, the above transmission method may also have the following features:
and when the base station sends a second demodulation reference signal, the number of the second demodulation reference signal corresponds to the number of the layers sent by the R-PDSCH, and the demodulation reference signals corresponding to all the layers are mutually orthogonal.
Further, the above transmission method may also have the following features:
when a Common Reference Signal (CRS) is mapped in physical resources for transmitting the R-PDCCH, the first demodulation reference signal is orthogonal to the common reference signal;
the second demodulation reference signal is orthogonal to the common reference signal when CRS is mapped in physical resources for transmitting the R-PDSCH.
Further, the above transmission method may also have the following features:
the orthogonal mode is as follows: the orthogonal mode is one or a combination of several of time division multiplexing, frequency division multiplexing or code division multiplexing.
Further, the above transmission method may also have the following features:
and the relay station demodulates the downlink control data of the relay link according to the received first demodulation reference signal and demodulates the downlink service data of the relay link according to the received second demodulation reference signal.
In order to solve the above technical problem, the present invention provides a base station for transmitting a relay link downlink demodulation reference signal, including:
the processing module is used for generating a first demodulation reference signal and a second demodulation reference signal of the relay link, wherein the first demodulation reference signal is not precoded and is used for coherent demodulation of an R-PDCCH, and the second demodulation reference signal is precoded together with downlink service data of the relay link before transmission and is used for coherent demodulation of an R-PDSCH;
when the R-PDCCH and the R-PDSCH are multiplexed and transmitted in one physical resource block, the base station respectively maps the first demodulation reference signal and the second demodulation reference signal in the physical resource block, wherein the second demodulation reference signal is only mapped in physical resources occupied by the R-PDSCH in the physical resource block, or the mapping position of the second demodulation reference signal is the whole physical resource block;
a sending module, configured to send the first demodulation reference signal and the second demodulation reference signal.
In order to solve the above technical problem, the present invention provides a relay station for receiving a relay link downlink demodulation reference signal, including:
the receiving module is used for receiving a first demodulation reference signal and a second demodulation reference signal of a relay link; when the R-PDCCH and the R-PDSCH are multiplexed and transmitted in one physical resource block, the base station respectively maps the first demodulation reference signal and the second demodulation reference signal in the physical resource block, wherein the second demodulation reference signal is only mapped in physical resources occupied by the R-PDSCH in the physical resource block, or the mapping position of the second demodulation reference signal is the whole physical resource block;
the processing module is used for demodulating the downlink control data of the relay link according to the first demodulation reference signal; and demodulating the downlink service data of the relay link according to the second demodulation reference signal.
The mapping method of the relay link demodulation reference signal, the base station and the relay station solve the problem that the R-PDCCH and the R-PDSCH adopt different data preprocessing modes and the problem of sending the demodulation reference signal under different multiplexing modes, and the relay station respectively carries out the coherent demodulation of the R-PDCCH and the R-PDSCH by using the demodulation reference signal, thereby ensuring the reliability of the data transmission of the R-PDCCH and the R-PDSCH. And when a common reference signal (CRS for short) exists in the relay link, the demodulation reference signal described by the invention cannot interfere with the CRS, so that the influence on the terminal is avoided.
Drawings
FIG. 1 is a frame structure diagram of an LTE/LTE-A system;
FIG. 2 is a schematic diagram of a Relay subframe structure;
fig. 3 is a schematic diagram of a method for transmitting a relay link downlink demodulation reference signal according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a physical resource structure of a downlink relay link according to an embodiment of the present invention;
fig. 5 is a second demodulation reference signal mapping diagram of application example 1 of the present invention;
fig. 6 is a schematic diagram of first and second demodulation reference signal mappings of application example 2 of the present invention;
fig. 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. 9 is a schematic diagram of a base station according to an embodiment of the present invention;
fig. 10 is a schematic diagram of an embodiment of the relay station of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
At present, the problem of sending corresponding demodulation reference signals when a Relay link downlink control channel R-PDCCH and a Relay link downlink service channel R-PDSCH adopt different preprocessing modes and different multiplexing modes is not involved in the related technical discussion of LTE-A system Relay. The embodiment of the invention provides a method for transmitting a downlink demodulation reference signal of a relay link. The processing principle of the method is as follows: and dividing the downlink demodulation reference signal of the relay link into a first demodulation reference signal and a second demodulation reference signal, wherein the first demodulation reference signal is not precoded and is used for coherent demodulation of the R-PDCCH, and the second demodulation reference signal and the downlink service data of the relay link are precoded together and are used for coherent demodulation of the R-PDSCH. The specific processing flow is shown in fig. 3.
Wherein,
in step 301, the base station generates a first demodulation reference signal and a second demodulation reference signal.
The specific mapping mode of the first demodulation reference signal and the second demodulation reference signal is related to the multiplexing mode of the R-PDCCH and the R-PDSCH. The multiplexing scheme of the R-PDCCH and the R-PDSCH is a time division scheme, a frequency division scheme or a time-frequency division scheme. Specifically, the time division mode means that the R-PDCCH and the R-PDSCH respectively occupy different OFDM symbols, namely are multiplexed in the same PRB; the frequency division mode means that the R-PDCCH and the R-PDSCH respectively occupy different physical resource blocks PRB; the time-frequency division multiplexing means that in the downlink physical resource of the relay link, the R-PDCCH and the R-PDSCH can be multiplexed in a part of PRB.
The first demodulation reference signal is not precoded and corresponds to an antenna port sent by the R-PDCCH, and the demodulation reference signals of all the ports are mutually orthogonal; and the second demodulation reference signal and the downlink service data of the relay link are precoded together, the number of the layers is corresponding to that of the R-PDSCH, and the demodulation reference signals of all the layers are mutually orthogonal. And when CRS exists in physical resources for transmitting the R-PDCCH and the R-PDSCH, the first demodulation reference signal and the second demodulation reference signal are both orthogonal to the CRS. The orthogonal method may be one or a combination of Time Division Multiplexing (TDM), Frequency Division Multiplexing (FDM), or Code Division Multiplexing (CDM).
When the R-PDCCH and the R-PDSCH are multiplexed in the same PRB, the first demodulation reference signal and the second demodulation reference signal are mutually orthogonal in a TDM or FDM or a combination of the TDM and FDM.
in one downlink Relay subframe, both R-PDCCH and R-PDSCH can exist, or only R-PDCCH or only R-PDSCH exists. When the R-PDCCH and the R-PDSCH exist simultaneously, a base station simultaneously carries a first demodulation reference signal and a second demodulation reference signal in a signal sent by a relay link; when only the R-PDCCH exists, the base station carries a first demodulation reference signal in a signal sent by the relay link without carrying a second demodulation reference signal; when only the R-PDSCH exists, the base station carries the second demodulation reference signal in the signal sent by the relay link without carrying the first demodulation reference signal.
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 performs coherent demodulation on the R-PDSCH according to the received second demodulation reference signal.
The following describes the implementation process of the invention in detail with reference to application examples.
In the following application example, it is assumed that a cell in the LTE-a system includes one base station and several relay stations, and the relay station receives data sent by the base station using an MBSFN subframe in a relay node cell, that is, for a subframe in which the relay station receives downlink data of a relay link, the relay station indicates that the subframe is an MBSFN subframe to a Rel-8 terminal in its own cell. Suppose that a subframe in which the base station transmits data to the relay station adopts a Normal cyclic prefix length (Normal CP) and totally includes 14 OFDM symbols, and suppose that a starting position at which the relay station receives downlink data of the relay link is a 4 th OFDM symbol and a receiving ending position is a 13 th OFDM symbol. Fig. 4 shows relay link resources corresponding to one PRB size in the frequency domain, where each small square in the drawing represents one Resource Element (RE), a gray filled region represents a physical resource for a relay station to receive relay link downlink data, and locations of CRSs of 4 ports are shown in the drawing. If the base station transmits data to the relay station by using the MBSFN subframe of the cell, CRS does not exist in the 4 th to 13 th OFDM symbols.
Application example 1
In the application example 1, the R-PDCCH and the R-PDSCH are multiplexed in the downlink physical resource of the relay link in a frequency division manner, that is, the R-PDCCH and the R-PDSCH occupy different PRBs respectively, and the R-PDCCH and the R-PDSCH do not exist simultaneously in the same PRB. At this time, the first demodulation reference signal and the second demodulation reference signal are mapped in PRBs occupied by the R-PDCCH and the R-PDSCH, respectively, and are only mapped in PRBs occupied by the R-PDCCH and the R-PDSCH. The first demodulation reference signal corresponds to an antenna port transmitted by the R-PDCCH, and the reference signals of all the ports are mutually orthogonal; the second demodulation reference signal corresponds to the number of the R-PDSCH transmission layers, and the reference signals of all the layers are mutually orthogonal. And when the CRS exists in the resources of the data transmission from the base station 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 mode can be one mode or a combination of modes in TDM, FDM or CDM.
Fig. 5 is a schematic diagram of a mapping pattern of the second demodulation reference signal. In fig. 5, the second demodulation reference signal is a TDM/FDM/CDM hybrid multiplexing scheme. In fig. 5, two layers of a second demodulation reference signal TDM combined FDM transmission are depicted, again in different layers within each layer. For example, in each layer, Walsh codes with length 2 are used to perform spreading in two adjacent pilot REs in the frequency domain, and 2 layers can be multiplexed, so that 4 channels of second demodulation reference signals can be obtained, corresponding to 4-layer transmission of the R-PDSCH. If the base station transmits data to the relay station by using the MBSFN subframe of the cell, the CRS in the R-PDSCH does not exist.
A similar acquisition is also possible for the pattern of the first demodulation reference signal.
It should be understood that the pattern examples of the first demodulation reference signal and the second demodulation reference signal described herein are only for explaining and illustrating the present invention, and are not to be construed as limiting the present invention.
Application example 2
In application example 2, the R-PDCCH and the R-PDSCH may be multiplexed in the same PRB, and the R-PDCCH and the R-PDSCH occupy different OFDM symbols in the same PRB, respectively. As shown in fig. 6, it is assumed that, in resources for transmitting data from the base station to the relay station, the R-PDCCH occupies a minimum of 3 OFDM symbols and a maximum of 4 OFDM symbols, and the R-PDSCH occupies the remaining OFDM symbols.
In this example, the first demodulation reference signal can be mapped only in the physical resources occupied by the R-PDCCH, and the second demodulation reference signal can be mapped only in the physical resources occupied by the R-PDSCH. Specifically, the first demodulation reference signal is mapped according to the condition that the number of OFDM symbols possibly occupied by the R-PDCCH is minimum, that is, only the first 3 OFDM symbols in the resource for the base station to transmit data to the relay station can be mapped in this example. The second demodulation reference signal is mapped according to the condition that the number of OFDM symbols possibly occupied by the R-PDSCH is the minimum, namely, the second demodulation reference signal can only be mapped in the last 6 OFDM in the resources for transmitting data from the base station to the relay station in the example. Fig. 6 is a schematic diagram illustrating a mapping pattern of a first demodulation reference signal and a second demodulation reference signal. Wherein 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 by using the MBSFN subframe of the cell, the CRS in the R-PDSCH does not exist.
Further, the first demodulation reference signal corresponds to an antenna port for R-PDCCH transmission, and reference signals of all ports are orthogonal to each other; the second demodulation reference signal corresponds to the number of the R-PDSCH transmission layers, and the reference signals of all the layers are mutually orthogonal. And when the CRS exists in the resources of the data transmission from the base station 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 mode can be one mode or a combination of modes in TDM, FDM or CDM.
It should be noted that the distribution of the first demodulation reference signal and the second demodulation reference signal in the PRB is only schematically described in fig. 6, and the correspondence relationship between the first demodulation reference signal and the antenna port in the R-PDCCH multi-antenna transmission is not shown, and the correspondence relationship between the second demodulation reference signal and the number of layers in the R-PDSCH multi-layer transmission is also not shown.
It should be understood that the pattern examples of the first demodulation reference signal and the second demodulation reference signal described herein are only for explaining and illustrating the present invention, and are not to be construed as limiting the present invention.
Application example 3
In application example 3, the R-PDCCH and the R-PDSCH may be multiplexed in the same PRB, and the R-PDCCH and the R-PDSCH may occupy different OFDM symbols in the same PRB, respectively. As shown in fig. 7, it is assumed that, in resources for transmitting data from the base station to the relay station, the R-PDCCH occupies a minimum of 3 OFDM symbols and a maximum of 4 OFDM symbols, and the R-PDSCH occupies the remaining OFDM symbols.
In this example, the first demodulation reference signal can be mapped only in physical resources occupied by the R-PDCCH, and the second demodulation reference signal can be mapped in all possible physical resources in the PRB where the R-PDSCH exists. Specifically, the first demodulation reference signal is mapped according to the condition that the number of OFDM symbols possibly occupied by the R-PDCCH is minimum, that is, only the first 3 OFDM symbols in the resource for the base station to transmit data to the relay station can be mapped in this example. The second demodulation reference signal is mapped according to the condition that the resources in the PRB for the base station to transmit data to the relay station are all occupied by the R-PDSCH, that is, in this example, the second demodulation reference signal can be mapped in the available resources of all OFDM symbols for the base station to transmit data to the relay station. Fig. 7 is a diagram illustrating a mapping pattern of a first demodulation reference signal and a second demodulation reference signal. Wherein 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 by using the MBSFN subframe of the cell, the CRS in the R-PDSCH does not exist.
Further, the first demodulation reference signal corresponds to an antenna port for R-PDCCH transmission, and reference signals of all ports are orthogonal to each other; the second demodulation reference signal corresponds to the number of the R-PDSCH transmission layers, and the reference signals of all the layers are mutually orthogonal. The patterns of the first demodulation reference signal and the second demodulation reference signal are mutually orthogonal, and when CRS exists in resources for transmitting 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 mode can be one mode or a combination of modes in TDM, FDM or CDM.
Further, when the first demodulation reference signal and the second demodulation reference signal are mapped according to the method in this example, the relay station can obtain the resource position occupied by the second demodulation reference signal in the R-PDCCH region before detecting the R-PDCCH information, so that the relay station can eliminate the RE occupied by the second demodulation reference signal in the R-PDCCH region when detecting the R-PDCCH blindly, and the influence of the second demodulation reference signal on the R-PDCCH blind detection is avoided.
It should be noted that the distribution of the first demodulation reference signal and the second demodulation reference signal in the PRB is only schematically described in fig. 7, and the correspondence relationship between the first demodulation reference signal and the antenna port in the R-PDCCH multi-antenna transmission is not shown, and the correspondence relationship between the second demodulation reference signal and the number of layers in the R-PDSCH multi-layer transmission is also not shown.
It should be understood that the pattern examples of the first demodulation reference signal and the second demodulation reference signal described herein are only for explaining and illustrating the present invention, and are not to be construed as limiting the present invention.
Application example 4
In application example 4, the R-PDCCH and the R-PDSCH may be multiplexed in the same PRB, and the R-PDCCH and the R-PDSCH occupy different OFDM symbols in the same PRB, respectively. As shown in fig. 6, in the resource for transmitting data to the relay station by the base station, the number of OFDM symbols occupied by the R-PDCCH is adjusted according to the data amount of the R-PDCCH, which may be 1 or 2 or 3 or 4 OFDM symbols, and the R-PDSCH occupies the remaining OFDM symbols.
In this example, the mapping position of the first demodulation reference signal also considers the performance of control information detection when the number of OFDM symbols occupied by the R-PDCCH is small and large. Specifically, the first demodulation reference signal is mapped in the first and third OFDM symbols within a PRB in which the base station transmits the R-PDCCH to the relay station. The second demodulation reference signal is mapped according to the condition that the resources in the PRB for the base station to transmit data to the relay station are all occupied by the R-PDSCH, that is, in this example, the second demodulation reference signal can be mapped in the available resources of all OFDM symbols for the base station to transmit data to the relay station. Fig. 8 is a diagram illustrating a mapping pattern of a first demodulation reference signal and a second demodulation reference signal. Wherein 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 by using the MBSFN subframe of the cell, the CRS in the R-PDSCH does not exist. In this example, the R-PDCCH occupies 2 OFDM symbols in the PRB it transmits, and the R-PDSCH occupies the remaining OFDM symbols.
Further, the first demodulation reference signal corresponds to an antenna port for R-PDCCH transmission, and reference signals of all ports are orthogonal to each other; the second demodulation reference signal corresponds to the number of the R-PDSCH transmission layers, and the reference signals of all the layers are mutually orthogonal. And when the CRS exists in the resources of the data transmission from the base station 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 mode can be one mode or a combination of modes in TDM, FDM or CDM.
Further, when the first demodulation reference signal and the second demodulation reference signal are mapped according to the method in this example, the relay station can obtain the resource position occupied by the second demodulation reference signal in the R-PDCCH region before detecting the R-PDCCH information, so that the relay station can eliminate the RE occupied by the second demodulation reference signal in the R-PDCCH region when detecting the R-PDCCH blindly, and the influence of the second demodulation reference signal on the R-PDCCH blind detection is avoided.
It should be noted that the distribution of the first demodulation reference signal and the second demodulation reference signal in the PRB is only schematically described in fig. 8, and the correspondence relationship between the first demodulation reference signal and the antenna port in the R-PDCCH multi-antenna transmission is not shown, and the correspondence relationship between the second demodulation reference signal and the number of layers in the R-PDSCH multi-layer transmission is also not shown.
It should be understood that the pattern examples of the first demodulation reference signal and the second demodulation reference signal described herein are only for explaining and illustrating the present invention, and are not to be construed as limiting the present invention.
Apparatus example 1
Through the embodiment of the invention, a base station is provided. Fig. 9 is a block diagram of a base station structure according to the present invention. As shown in fig. 9, the apparatus includes: a processing module 92 and a sending module 94. A processing module 92, 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 precoded and is used for coherent demodulation of the R-PDCCH, and the second demodulation reference signal is precoded together with downlink service data of the relay link before transmission and is used for coherent demodulation of the R-PDSCH; the transmitting module 94 is connected to the processing module 92, and is configured to transmit the first demodulation reference signal and the second demodulation reference signal of the relay link generated by the processing module 92.
Apparatus example 2
Through the embodiment of the invention, the relay station is provided. Fig. 10 is a block diagram of a relay station according to the present invention. As shown in fig. 10, the apparatus includes: a receiving module 102 and a processing module 104. A receiving module 102, configured to receive a first demodulation reference signal and a second demodulation reference signal of a relay link; the processing module 104 is connected to the receiving module 102, and configured to demodulate the relay link downlink control data according to the first demodulation reference signal; and demodulating the downlink service data of the relay link according to the second demodulation reference signal.
In summary, the method, the base station and the relay station of the present invention solve the problem that the R-PDCCH and the R-PDSCH adopt different preprocessing methods and the mapping of demodulation reference signals in different multiplexing methods. And when the relay link has the CRS, the demodulation reference signal described by the invention cannot interfere with the CRS, thereby avoiding the influence on the terminal.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (11)
1. A method for transmitting a downlink demodulation reference signal of a relay link comprises the following steps:
when the base station sends the downlink control data of the relay link to the relay station, the base station sends a first demodulation reference signal to the relay station at the same time; when the base station sends the downlink service data of the relay link to the relay station, the base station sends a second demodulation reference signal to the relay station at the same time;
wherein,
the relay link downlink control data is carried in a relay physical downlink control channel R-PDCCH,
the relay link downlink service data is carried in a relay physical downlink shared channel R-PDSCH,
the first demodulation reference signal is not precoded and is used for coherent demodulation of the R-PDCCH;
precoding the second demodulation reference signal together with downlink service data of a relay link before sending the second demodulation reference signal for coherent demodulation of the R-PDSCH;
when the R-PDCCH and the R-PDSCH are multiplexed and transmitted in one physical resource block, the base station respectively maps the first demodulation reference signal and the second demodulation reference signal in the physical resource block, wherein the second demodulation reference signal is only mapped in physical resources occupied by the R-PDSCH in the physical resource block, or the mapping position of the second demodulation reference signal is the whole physical resource block.
2. The transmission method of claim 1,
and the base station maps the first demodulation reference signal in the physical resource occupied by the R-PDCCH and then sends the first demodulation reference signal to a relay station.
3. The transmission method of claim 2,
the physical resource is a physical resource block, or
The physical resources are all frequency resources in the OFDM symbol, or
The physical resource is a part of frequency resource in the OFDM symbol.
4. The transmission method of claim 1,
when the R-PDCCH and the R-PDSCH are multiplexed and transmitted in one physical resource block, the first demodulation reference signal and the second demodulation reference signal are mutually orthogonal, and the orthogonal mode is as follows: time division multiplexing or frequency division multiplexing or a combination of both.
5. The transmission method of claim 1,
when the base station sends a first demodulation reference signal, the first demodulation reference signal corresponds to the antenna port sent by the R-PDCCH, and the demodulation reference signals corresponding to the antenna ports are orthogonal to each other.
6. The transmission method of claim 1,
and when the base station sends a second demodulation reference signal, the number of the second demodulation reference signal corresponds to the number of the layers sent by the R-PDSCH, and the demodulation reference signals corresponding to all the layers are mutually orthogonal.
7. The transmission method of claim 1,
when a Common Reference Signal (CRS) is mapped in physical resources for transmitting the R-PDCCH, the first demodulation reference signal is orthogonal to the common reference signal;
the second demodulation reference signal is orthogonal to the common reference signal when CRS is mapped in physical resources for transmitting the R-PDSCH.
8. The transmission method according to any one of claims 5 to 7,
the orthogonal mode is as follows: the orthogonal mode is one or a combination of several of time division multiplexing, frequency division multiplexing or code division multiplexing.
9. The transmission method of claim 1,
and the relay station demodulates the downlink control data of the relay link according to the received first demodulation reference signal and demodulates the downlink service data of the relay link according to the received second demodulation reference signal.
10. A base station for transmitting a relay link downlink demodulation reference signal, comprising:
the processing module is used for generating a first demodulation reference signal and a second demodulation reference signal of a relay link, wherein the first demodulation reference signal is not precoded and is used for coherent demodulation of a relay physical downlink control channel (R-PDCCH), and the second demodulation reference signal is precoded together with downlink service data of the relay link before transmission and is used for coherent demodulation of a relay physical downlink shared channel (R-PDSCH); when the R-PDCCH and the R-PDSCH are multiplexed and transmitted in one physical resource block, mapping the first demodulation reference signal and the second demodulation reference signal in the physical resource block respectively, wherein the second demodulation reference signal is only mapped in physical resources occupied by the R-PDSCH in the physical resource block, or the mapping position of the second demodulation reference signal is the whole physical resource block;
a sending module, configured to send the first demodulation reference signal and the second demodulation reference signal.
11. A relay station for receiving a relay link downlink demodulation reference signal, comprising:
the receiving module is used for receiving a first demodulation reference signal and a second demodulation reference signal of a relay link;
when a relay physical downlink control channel (R-PDCCH) and a relay physical downlink shared channel (R-PDSCH) are multiplexed and transmitted in one physical resource block, the first demodulation reference signal and the second demodulation reference signal are respectively mapped in the physical resource block, wherein the second demodulation reference signal is only mapped in physical resources occupied by the R-PDSCH in the physical resource block, or the mapping position of the second demodulation reference signal is the whole physical resource block;
the processing module is used for demodulating the downlink control data of the relay link according to the first demodulation reference signal; demodulating downlink service data of the relay link according to the second demodulation reference signal;
the first demodulation reference signal is not precoded and is used for coherent demodulation of the R-PDCCH;
precoding the second demodulation reference signal together with downlink service data of a relay link before sending the second demodulation reference signal for coherent demodulation of the R-PDSCH;
the relay link downlink control data is loaded in the R-PDCCH;
and the downlink service data of the relay link is loaded in the R-PDSCH.
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| PCT/CN2010/074850 WO2011009371A1 (en) | 2009-07-22 | 2010-06-30 | Method for sending downlink demodulation reference signal, base station and relay station thereof |
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| EP2680632B1 (en) | 2011-02-22 | 2019-07-03 | Sun Patent Trust | Relay station, base station and communication method |
| WO2012145891A1 (en) * | 2011-04-25 | 2012-11-01 | Alcatel Lucent | Apparatus for enabling ue-specific pdcch and ue device for identifying such pdcch |
| CN102882566A (en) * | 2011-07-12 | 2013-01-16 | 华为技术有限公司 | Method and equipment for reducing transmission interlamination interference in multi-user MIMO (Multiple Input Multiple Output) system |
| CN102904669B (en) * | 2011-07-29 | 2016-05-18 | 上海贝尔股份有限公司 | Precoding Physical Downlink Control Channel reference signal and blind interpretation method and device |
| RU2566739C2 (en) * | 2011-08-23 | 2015-10-27 | Нек Корпорейшн | Communication device, signal superimposing circuit and signal superimposing method |
| CN103248586A (en) * | 2012-02-13 | 2013-08-14 | 华为技术有限公司 | Methods for transmitting and detecting control signaling, network equipment and user equipment |
| JP6191997B2 (en) * | 2012-03-06 | 2017-09-06 | シャープ株式会社 | Mobile station apparatus, base station apparatus, communication method, and integrated circuit |
| CN103858400B (en) * | 2012-08-01 | 2017-08-04 | 华为技术有限公司 | Transmission method, base station and the terminal of control channel |
| CN103781160B (en) * | 2012-10-23 | 2017-06-20 | 华为技术有限公司 | The transmission method and device of data |
| CN104219021A (en) | 2013-05-31 | 2014-12-17 | 中兴通讯股份有限公司 | Downlink data transmission method, apparatus, and system for virtual multi-antenna system |
| CN106961298A (en) * | 2016-01-08 | 2017-07-18 | 北京信威通信技术股份有限公司 | A kind of multi-antenna sending method |
| KR102184771B1 (en) | 2017-11-13 | 2020-11-30 | 엘지전자 주식회사 | Method for transmitting and receiving data in wireless communication system and apparatus therefor |
| CN112385252B (en) * | 2018-11-01 | 2024-08-09 | 松下电器（美国）知识产权公司 | Transmitting apparatus, receiving apparatus and method thereof |
| CN112492274B (en) * | 2020-11-26 | 2021-08-17 | 江南大学 | National secret encryption transmission equipment based on common network camera |
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