WO2011085512A1 - Method and device for transmitting data packets by using cooperative multiplex based on beamforming - Google Patents
Method and device for transmitting data packets by using cooperative multiplex based on beamforming Download PDFInfo
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- WO2011085512A1 WO2011085512A1 PCT/CN2010/000053 CN2010000053W WO2011085512A1 WO 2011085512 A1 WO2011085512 A1 WO 2011085512A1 CN 2010000053 W CN2010000053 W CN 2010000053W WO 2011085512 A1 WO2011085512 A1 WO 2011085512A1
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- relay
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- data packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
Definitions
- the present invention relates to the field of mobile communications, and more particularly to a method and a transmitting device for transmitting data packets by using beamforming-based cooperative multiplexing in a multi-hop relay system, wherein the cooperative multiplexing technique utilizes beamforming technology Co-channel interference is reduced, and the best compromise between diversity and multiplexing is achieved without sacrificing link robustness, increasing the data rate.
- Background technique
- Relay technology is a key technology for increasing capacity and expanding coverage areas for the high spectrum efficiency requirements proposed by Advanced LTE (Long Term Evolution).
- System performance can be further improved by introducing cooperative relay technologies, such as cooperative scheduling and joint processing, in eNBs (base stations) and/or relay nodes (RNs).
- eNBs base stations
- RNs relay nodes
- the current work mainly emphasizes the cooperative diversity gain of the relay system, in which the relay node helps the transmission source to utilize the spatial diversity of the slow fading channel in a distributed manner, thereby improving the link quality, but ignoring the possibility that it may bring Multiplexing gain.
- the relay node in a half-duplex relay network (which is widely used in advanced LTE), since the relay node requires an extra transmission slot, it is difficult to obtain multiplexing gain, especially when the transmission source is configured with only one antenna.
- FIG. 1 shows an illustration of a cooperative relay in which an eNB and an RN can cooperatively provide services for a user terminal (UE).
- the eNB and the RN transmit in the SFBC format, that is, in the adjacent subcarriers, the eNB transmits [s 2 s,] and the RN transmits [s, ' - 5 ], the array gain and the cooperative receive diversity can be realized. Gain, which improves the transmission quality of the link.
- the eNB transmits s, and the RN transmits s 2 at the same time, the cooperative multiplexing gain is extracted.
- the prior art solutions cannot obtain both the diversity gain and the multiplexing gain.
- FIG. 2 shows a scenario of two RNs and two users. Due to the use of frequency reuse, frequency efficiency can be significantly improved. However, when the distance between multiple RNs is short or the transmit power of the RN is large, due to the frequency Interference between multiple RNs caused by reuse is unavoidable, and as a result, performance deteriorates. It is of course possible to use a certain proportion of frequency reuse to mitigate interference and to obtain a compromise between frequency efficiency and performance, but the throughput gain is limited.
- the present invention has been made in order to overcome the deficiencies of the prior art. Accordingly, it is an object of the present invention to provide a method and a transmitting device for transmitting data packets by using beamforming-based cooperative multiplexing in a multi-hop relay system, wherein the best diversity and multiplexing are obtained by cooperative multiplexing. Compromise and increase the data rate without sacrificing link robustness, and reduce beam multi-user interference with beamforming techniques. ' ' ,
- a method for transmitting data packets by using beamforming-based cooperative multiplexing in a multi-hop relay system including: a base station utilizing a relay link to each relay node
- the beamforming vector corresponding to the channel state information weights the data packet to be transmitted to obtain the first weighted data packet, and transmits the first weighted data to the plurality of relay nodes through the relay link.
- a plurality of relay nodes forwarding the first weighted data packet to a plurality of user terminals using the same time-frequency resource; and the base station utilizing beamforming vectors corresponding to channel state information of the direct link to each user terminal And weighting the data packet to be sent to obtain a second weighted data packet, and transmitting, by using the same time-frequency resource, the second weighted data packet to the plurality of user terminals by using the direct link.
- the base station and the corresponding relay node perform cooperative scheduling and joint transmission, thereby implementing collaborative space diversity of the user terminal.
- the transmission of data packets from the base station and the relay node to the user terminal is encoded using the modified spatial frequency block coding SFBC mode.
- the user terminal combines the received data packets using the SFBC detection method.
- the multi-hop relay system employs a multiple input multiple output MIM0 system.
- a transmitting end device for transmitting a data packet by using beamforming-based cooperative multiplexing in a multi-hop relay system, comprising: a first weighting processing device, configured to utilize Generating a data packet to be transmitted to a beamforming vector corresponding to channel state information of a relay link of each relay node to obtain a first weighted data packet; and second weighting processing means for utilizing and Weighting a data packet to be transmitted by a beamforming vector corresponding to channel state information of a direct link of each user terminal to obtain a second weighted data packet; and transmitting means for passing the relay chain Transmitting, by the plurality of relay nodes, the first weighted data packet, so that the plurality of relay nodes forward the first weighted data packet to the plurality of user terminals by using the same time-frequency resource; and utilizing the same The time-frequency resource transmits the second weighted data packet to the plurality of user terminals through the direct link.
- FIG. 3 is a schematic diagram showing a system utilizing beamforming-based cooperative multiplexing according to the present invention
- FIG. 4 is a diagram showing transmission using beamforming-based cooperative multiplexing in a multi-hop relay system according to the present invention.
- Figure 5 is a block diagram showing the structure of a transmitting device that utilizes beamforming-based cooperative multiplexing to transmit data packets in a multi-hop relay system according to the present invention
- Figure 6 is a schematic diagram showing the simulation of the comparison between the system of the present invention and the prior art. detailed description
- the present invention proposes a beamforming-based cooperative multiplexing scheme that utilizes intra-cell interference cancellation to obtain an optimal compromise between link robust gain and rate gain.
- the eNB simultaneously transmits the first weighted data packet to the plurality of RNs involved in the cooperative processing through the relay link in the first stage, wherein the base station utilizes channel state information corresponding to the relay link to each RN
- the beamforming vector weights the data packets to be transmitted to obtain the first weighted data packet.
- the transport data packets from the eNB and the RN to the UE form an improved SFBC codeword.
- the cooperative multiplexing scheme according to the present invention is capable of optimizing spatial diversity gain and spatial multiplexing gain, and improving system performance. Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.
- the beamforming-based collaborative multiplexing scheme is in principle a distributed multiple-input multiple-output (MIM0) system in a multi-hop environment, as shown in Figure 3.
- Figure 3 shows a schematic diagram of two RNs and two user terminals (UEs) in an eNB, wherein the same time-frequency resources within a subframe are allocated to the RN, or the RN and the eNB. These nodes work together as distributed antennas to form a virtual MIM0.
- the eNB transmits two data packets simultaneously to two RNs, where the two data packets are first weighted by the beamforming vector and the two RNs receive the data packets simultaneously.
- the received signal in the first phase can be expressed as: Where W represents the first hop, , !
- RNs 1 and 2 receive the weighted data packets and perform decoding and demodulation, respectively. Due to eNB and RN 1 The high quality channel between and 2 can be considered to be completely correct for decoding and demodulation. Thereafter, RNs 1 and 2 are re-encoded and re-modulated and then transmitted to the UE.
- the improved SFBC is used for the transmission signal format, gp, and the data packet is encoded based on the frequency direction after comprehensively considering the transmission data format from the eNB to the UE. Therefore, the signals received by the i-th UE from two adjacent subcarriers of the cooperative link are:
- the transmit signal from the eNB is still weighted by the beamforming vector, expressed as: Therefore, the combined channel is: (4) Equation (2) can be expressed as a matrix:
- A, and N represent signal power, interference power, and AWGN power spectral density, respectively.
- FIG. 4 is a flow chart showing a method of transmitting data packets using beamforming-based cooperative multiplexing in a multi-hop relay system in accordance with the present invention.
- the base station performs weighting processing on data packets to be transmitted by using beamforming vectors corresponding to channel state information of relay links to respective relay nodes.
- the first weighted data packet and transmitting the first weighted data packet to the plurality of relay nodes through the relay link.
- the plurality of relay nodes forward the first weighted data packet to the plurality of user terminals by using the same time-frequency resource.
- step 405 the base station performs weighting processing on the data packet to be transmitted by using a beamforming vector corresponding to channel state information of a direct link to each user terminal to obtain a second weighted data packet, and utilizes The same time-frequency resource transmits the second weighted data packet to the plurality of user terminals through the direct link.
- 5 is a block diagram showing the structure of a transmitting device that transmits data packets using beamforming-based cooperative multiplexing in a multi-hop relay system according to the present invention.
- a transmitting device e.g., a base station
- the first weighting processing means 501 performs weighting processing on the data packets to be transmitted using the beamforming vectors corresponding to the channel state information of the relay links of the respective relay nodes to obtain the first weighted data packets.
- the second weighting processing means 503 performs weighting processing on the data packet to be transmitted using the beamforming vector corresponding to the channel state information of the direct link to each user terminal to obtain the second weighted data packet.
- the transmitting device 505 transmits the first weighted data packet to the plurality of relay nodes through the relay link, so that the first weighted data packet is forwarded to the plurality of relay nodes by using the same time-frequency resource.
- a user terminal a user terminal; and transmitting the second weighted data packet to the plurality of user terminals over the direct link by using the same time-frequency resource.
- each eNodeB serves 3 cells
- Downlink HARQ has CC's asynchronous HARQ, maximum triple retransmission, and hop-by-hop HARQ in the relay system
- the eNB antenna is configured with two Tx antennas having an antenna pattern as defined in 3GPP TS 36.81 4 VI .5.1
- the RN antenna is configured with one Tx antenna and one Rx antenna, each having an antenna pattern defined in 3GPP TS 36.81 4 VI .5.1
- UE antenna configuration 2 Rx antennas (O dBi antenna gain, omnidirectional)
- Control channel overhead z ⁇ ] acknowledgment LTE: overhead of 3 symbols of the downlink control channel (DL CCH ) plus the overhead of the demodulation reference signal
- the bee without the RN is full frequency and the relay system for the cooperative multiplexing relay system is proposed.
- Figure 6 is a schematic diagram showing the simulation of the comparison between the system of the present invention and the prior art.
- the present invention achieves a significant increase in user throughput. This is because on the one hand, cooperative multiplexing achieves the best compromise between diversity and multiplexing and increases the data rate without sacrificing link robustness; on the other hand, beamforming technology will reduce multi-users. Interference, and cooperative techniques also avoid co-channel interference.
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Abstract
A method for transmitting data packets by using cooperative multiplex based on beamforming in a multi-hop relay system is provided according to the present invention, which includes the following steps: a base station performs a weight processing to the data packets to be transmitted, by using the beamforming vectors corresponding to the channel status information of the relay links for connecting to each relay node, thus obtains the firstly weighted data packets, and the base station transmits the firstly weighted data packets to a plurality of relay nodes through the said relay links (401); a plurality of relay nodes transfer the firstly weighted data packets to a plurality of user terminals by using the same time-frequency resources (403); and, the base station performs the weight processing to the said data packets to be transmitted, by using the beamforming vectors corresponding to the channel status information of the direct links for connecting to each user terminal, thus obtains the secondly weighted data packets, and the base station transmits the secondly weighted data packets to a plurality of user terminals through the said direct links by using the said same time-frequency resources (405).
Description
利用基于波束成形的协同复用传送数据分组的方法和设备 Method and apparatus for transmitting data packets using beamforming based cooperative multiplexing
技术领域 Technical field
本发明涉及移动通信领域, 更具体地, 涉及一种在多跳中继***中利用基 于波束成形的协同复用来传送数据分组的方法和发送端设备, 其中协同复用技术 通过利用波束成形技术降低了同信道干扰, 且在不会牺牲链路鲁棒性作为代价的 情况下获得了分集和复用的最佳折中, 增加了数据速率。 背景技术 The present invention relates to the field of mobile communications, and more particularly to a method and a transmitting device for transmitting data packets by using beamforming-based cooperative multiplexing in a multi-hop relay system, wherein the cooperative multiplexing technique utilizes beamforming technology Co-channel interference is reduced, and the best compromise between diversity and multiplexing is achieved without sacrificing link robustness, increasing the data rate. Background technique
中继技术是一种针对由先进 LTE (长期演进) 所提出的高频谱效率需求提高 容量和扩展覆盖区域的关键技术。 通过在 eNB (基站) 和 /或中继节点 (RN ) 中引 入协同中继技术, 例如协同调度和联合处理, 能够进一步提高***性能。 Relay technology is a key technology for increasing capacity and expanding coverage areas for the high spectrum efficiency requirements proposed by Advanced LTE (Long Term Evolution). System performance can be further improved by introducing cooperative relay technologies, such as cooperative scheduling and joint processing, in eNBs (base stations) and/or relay nodes (RNs).
当前的工作主要强调中继***的协同分集增益, 其中中继节点帮助发射源 以分布式的方式来利用慢衰落信道的空间分集, 从而可以提高链路质量, 但忽略 了其可能会带来的复用增益。 然而, 在半双工中继网络 (其广泛用于先进 LTE ) 中, 由于中继节点需要额外的传输时隙, 因此难以获得复用增益, 特别是当发射 源仅配置有一根天线时。 The current work mainly emphasizes the cooperative diversity gain of the relay system, in which the relay node helps the transmission source to utilize the spatial diversity of the slow fading channel in a distributed manner, thereby improving the link quality, but ignoring the possibility that it may bring Multiplexing gain. However, in a half-duplex relay network (which is widely used in advanced LTE), since the relay node requires an extra transmission slot, it is difficult to obtain multiplexing gain, especially when the transmission source is configured with only one antenna.
在多跳中继网络中, 一种广泛采用的现有技术方案是针对协同中继的分布 式空间频率块编码 (SFBC ) 和分布式空间复用 (SM ) , 因为不需要反馈信道状态 信息 (CSI ), 可以有效地提高性能, 而没有额外的信令开销。 图 1示出了协同中 继的图示,其中 eNB和 RN可以协同地为用户终端(UE )提供服务。当 eNB和 RN以 SFBC 格式来传输时, 即, 在相邻的子载波中, eNB传输 [s2 s,] , 而 RN 传输 [s,' -5 ] , 则可以实现阵列增益和协同接收分集增益, 从而提高了链路的传输质量。 当 eNB 传输 s,, 而 RN同时传输 s2, 则提取协同复用增益。 但是, 现有技术方案都无法同 时获得分集增益和复用增益。 In a multi-hop relay network, a widely used prior art solution is distributed spatial frequency block coding (SFBC) and distributed spatial multiplexing (SM) for cooperative relay because feedback channel state information is not required ( CSI) can effectively improve performance without additional signaling overhead. FIG. 1 shows an illustration of a cooperative relay in which an eNB and an RN can cooperatively provide services for a user terminal (UE). When the eNB and the RN transmit in the SFBC format, that is, in the adjacent subcarriers, the eNB transmits [s 2 s,] and the RN transmits [s, ' - 5 ], the array gain and the cooperative receive diversity can be realized. Gain, which improves the transmission quality of the link. When the eNB transmits s, and the RN transmits s 2 at the same time, the cooperative multiplexing gain is extracted. However, the prior art solutions cannot obtain both the diversity gain and the multiplexing gain.
另一现有方案是使用频率复用技术, 即, 在非协同中继***中, 为了增加 中继***的吞吐量, 当存在由 eNB所服务的多个 RN, 并且每一个 RN为不同的用户 服务, 则多个 RN可以使用相同的频率来向不同的用户传送不同的信号, 如图 2所 示。 图 2示出了两个 RN和两个用户的场景。 由于频率重用的使用, 可以显著地提 高频率效率。 然而, 当多个 RN之间的距离较短或 RN的发射功率较大时, 由于频率
重用所导致的多个 RN之间的干扰是不可避免的, 因此, 性能反而会恶化。 当然 可以使用一定比例的频率重用来减轻干扰, 并且获得频率效率和性能之间的折 中, 但是吞吐量增益会受到限制。 Another existing solution is to use a frequency reuse technique, that is, in a non-cooperative relay system, in order to increase the throughput of the relay system, when there are multiple RNs served by the eNB, and each RN is a different user Service, multiple RNs can use the same frequency to transmit different signals to different users, as shown in Figure 2. Figure 2 shows a scenario of two RNs and two users. Due to the use of frequency reuse, frequency efficiency can be significantly improved. However, when the distance between multiple RNs is short or the transmit power of the RN is large, due to the frequency Interference between multiple RNs caused by reuse is unavoidable, and as a result, performance deteriorates. It is of course possible to use a certain proportion of frequency reuse to mitigate interference and to obtain a compromise between frequency efficiency and performance, but the throughput gain is limited.
因此, 需要提出一种基于波束成形的协同复用方案, 能够改进具有多天线 的中继***的吞吐量, 并且获得通过复用的速率增益与分布式结构相关的分集增 益之间的折中。 发明内容 Therefore, there is a need for a beamforming-based cooperative multiplexing scheme that can improve the throughput of a relay system having multiple antennas and achieve a compromise between the rate gain of multiplexing and the diversity gain associated with the distributed architecture. Summary of the invention
为了克服现有技术的缺陷提出了本发明。 因此, 本发明的目的是提出一种 在多跳中继***中利用基于波束成形的协同复用来传送数据分组的方法和发送 端设备, 其中通过协同复用获得了分集和复用的最佳折中且在不会牺牲链路鲁棒 性作为代价的情况下增加了数据速率, 并且利用波束成形技术降低了多用户干 扰。 ' ' , The present invention has been made in order to overcome the deficiencies of the prior art. Accordingly, it is an object of the present invention to provide a method and a transmitting device for transmitting data packets by using beamforming-based cooperative multiplexing in a multi-hop relay system, wherein the best diversity and multiplexing are obtained by cooperative multiplexing. Compromise and increase the data rate without sacrificing link robustness, and reduce beam multi-user interference with beamforming techniques. ' ' ,
为了实现上述目的, 根据本发明, 提出了一种在多跳中继***中利用基于 波束成形的协同复用来传送数据分组的方法, 包括: 基站利用与到各个中继节点 的中继链路的信道状态信息相对应的波束成形矢量对要发送的数据分组进行加 权处理以获得第一加权后的数据分组, 并且通过所述中继链路向多个中继节点传 输第一加权后的数据分组; 多个中继节点利用相同的时频资源将第一加权后的数 据分组转发到多个用户终端; 以及基站利用与到各个用户终端的直接链路的信道 状态信息相对应的波束成形矢量对所述要发送的数据分组进行加权处理以获得 第二加权后的数据分组, 并且利用所述相同的时频资源通过所述直接链路向多个 用户终端传输第二加权后的数据分组。 In order to achieve the above object, according to the present invention, a method for transmitting data packets by using beamforming-based cooperative multiplexing in a multi-hop relay system is proposed, including: a base station utilizing a relay link to each relay node The beamforming vector corresponding to the channel state information weights the data packet to be transmitted to obtain the first weighted data packet, and transmits the first weighted data to the plurality of relay nodes through the relay link. a plurality of relay nodes forwarding the first weighted data packet to a plurality of user terminals using the same time-frequency resource; and the base station utilizing beamforming vectors corresponding to channel state information of the direct link to each user terminal And weighting the data packet to be sent to obtain a second weighted data packet, and transmitting, by using the same time-frequency resource, the second weighted data packet to the plurality of user terminals by using the direct link.
优选地, 基站和相应的中继节点进行协同调度和联合传输, 从而实现用户 终端协同空间分集。 Preferably, the base station and the corresponding relay node perform cooperative scheduling and joint transmission, thereby implementing collaborative space diversity of the user terminal.
优选地, 从基站和中继节点到用户终端的数据分组的传输采用修改后的空 间频率块编码 SFBC方式来进行编码。 Preferably, the transmission of data packets from the base station and the relay node to the user terminal is encoded using the modified spatial frequency block coding SFBC mode.
优选地, 用户终端利用 SFBC检测方法对接收到的数据分组进行合并。 Preferably, the user terminal combines the received data packets using the SFBC detection method.
优选地, 所述多跳中继***采用多输入多输出 MIM0***。 Preferably, the multi-hop relay system employs a multiple input multiple output MIM0 system.
另外, 根据本发明, 还提出了一种在多跳中继***中利用基于波束成形的 协同复用来传送数据分组的发送端设备, 包括: 第一加权处理装置, 用于利用与
到各个中继节点的中继链路的信道状态信息相对应的波束成形矢量对要发送的 数据分组进行加权处理以获得第一加权后的数据分组; 第二加权处理装置, 用于 利用与到各个用户终端的直接链路的信道状态信息相对应的波束成形矢量对所 述要发送的数据分组进行加权处理以获得第二加权后的数据分组; 以及传送装 置, 用于通过所述中继链路向多个中继节点传输第一加权后的数据分组, 以便由 多个中继节点利用相同的时频资源将第一加权后的数据分组转发到多个用户终 端; 以及利用所述相同的时频资源通过所述直接链路向多个用户终端传输第二加 权后的数据分组。 附图说明 In addition, according to the present invention, there is also provided a transmitting end device for transmitting a data packet by using beamforming-based cooperative multiplexing in a multi-hop relay system, comprising: a first weighting processing device, configured to utilize Generating a data packet to be transmitted to a beamforming vector corresponding to channel state information of a relay link of each relay node to obtain a first weighted data packet; and second weighting processing means for utilizing and Weighting a data packet to be transmitted by a beamforming vector corresponding to channel state information of a direct link of each user terminal to obtain a second weighted data packet; and transmitting means for passing the relay chain Transmitting, by the plurality of relay nodes, the first weighted data packet, so that the plurality of relay nodes forward the first weighted data packet to the plurality of user terminals by using the same time-frequency resource; and utilizing the same The time-frequency resource transmits the second weighted data packet to the plurality of user terminals through the direct link. DRAWINGS
通过参考以下结合附图对所采用的优选实施例的详细描述, 本发明的上述 目的、 优点和特征将变得显而易见, 其中- 图 1是示出了现有技术的协同中继的示意图; The above-described objects, advantages and features of the present invention will become more apparent from the aspects of the description accompanying the accompanying drawings
图 2是示出了现有技术的频率重用的示意图; 2 is a schematic diagram showing frequency reuse of the prior art;
图 3是示出了根据本发明的利用基于波束成形的协同复用的***的示意图; 图 4是示出了根据本发明的在多跳中继***中利用基于波束成形的协同复 用来传送数据分组的方法的流程图; 3 is a schematic diagram showing a system utilizing beamforming-based cooperative multiplexing according to the present invention; FIG. 4 is a diagram showing transmission using beamforming-based cooperative multiplexing in a multi-hop relay system according to the present invention. Flow chart of a method of data grouping;
图 5是示出了根据本发明的在多跳中继***中利用基于波束成形的协同复 用来传送数据分组的发送端设备的结构方框图; 以及 Figure 5 is a block diagram showing the structure of a transmitting device that utilizes beamforming-based cooperative multiplexing to transmit data packets in a multi-hop relay system according to the present invention;
图 6是示出了本发明的***与现有技术的比较结果的仿真示意图。 具体实施方式 Figure 6 is a schematic diagram showing the simulation of the comparison between the system of the present invention and the prior art. detailed description
本发明提出了基于波束成形的协同复用方案, 利用小区内干扰消除来获得 链路鲁棒增益和速率增益之间的最佳折中。 The present invention proposes a beamforming-based cooperative multiplexing scheme that utilizes intra-cell interference cancellation to obtain an optimal compromise between link robust gain and rate gain.
1 ) eNB在第一阶段中通过中继链路向涉及协同处理的多个 RN同时传输第一 加权后的数据分组, 其中基站利用与到各个 RN的中继链路的信道状态信息相对应 的波束成形矢量对要发送的数据分组进行加权处理以获得第一加权后的数据分 组。 1) The eNB simultaneously transmits the first weighted data packet to the plurality of RNs involved in the cooperative processing through the relay link in the first stage, wherein the base station utilizes channel state information corresponding to the relay link to each RN The beamforming vector weights the data packets to be transmitted to obtain the first weighted data packet.
2 ) RN正确地解调该第一加权后的数据分组,然后完成第二阶段的以下过程: a )每一个 RN将具有除了符号和共轭变化之外相同的数据内容的编码数据分
组传送到用户, 并且多个 RN和用户对之间的传输使用相同的时频资源; b ) 同时, eNB利用与到各个 UE的直接链路的信道状态信息相对应的波束成 形矢量对与第一阶段中的数据分组相同的数据分组进行加权, 以获得第二加权后 的数据分组, 并且利用所述相同的时频资源通过所述直接链路向多个 UE传输第二 加权后的数据分组; 2) The RN correctly demodulates the first weighted data packet, and then completes the following process of the second phase: a) Each RN will have encoded data points of the same data content except for symbol and conjugate changes. The group is transmitted to the user, and the transmission between the multiple RNs and the user pair uses the same time-frequency resource; b) At the same time, the eNB utilizes the beamforming vector pair corresponding to the channel state information of the direct link to each UE Data packets in the same phase are weighted by the same data packet to obtain a second weighted data packet, and the second weighted data packet is transmitted to the plurality of UEs through the direct link by using the same time-frequency resource. ;
c ) 由此, 从 eNB和 RN到 UE的传输数据分组形成改进的 SFBC码字。 c) Thus, the transport data packets from the eNB and the RN to the UE form an improved SFBC codeword.
3 ) 然后, 这些 UE接收数据分组, 并且利用 SFBC检测方案来对接收到的数据 分组进行合并。 3) These UEs then receive the data packets and combine the received data packets using the SFBC detection scheme.
根据本发明的协同复用方案能够最优化空间分集增益和空间复用增益, 并 且提高***性能。 下面将参考附图来描述本发明的优选实施例。 The cooperative multiplexing scheme according to the present invention is capable of optimizing spatial diversity gain and spatial multiplexing gain, and improving system performance. Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.
基于波束成形的协同复用方案原则上是在多跳环境下的分布式多输入多输 出 (MIM0 ) ***, 如图 3所示。 图 3示出了在 eNB中的两个 RN和两个用户终端 (UE ) 的示意图, 其中将子帧内的相同时频资源分配给 RN、 或者 RN和 eNB。 这些节点如 分布式天线那样协同操作来形成一种虚拟 MIM0。 The beamforming-based collaborative multiplexing scheme is in principle a distributed multiple-input multiple-output (MIM0) system in a multi-hop environment, as shown in Figure 3. Figure 3 shows a schematic diagram of two RNs and two user terminals (UEs) in an eNB, wherein the same time-frequency resources within a subframe are allocated to the RN, or the RN and the eNB. These nodes work together as distributed antennas to form a virtual MIM0.
考虑由分别具有 2个天线、 1个天线和 2个天线的 eNB、 RN和 UE构成的三节点 中继***。 在第一阶段, eNB将两个数据分组同时传送到两个 RN, 其中两个数据 分组首先由波束成形矢量来加权, 并且两个 RN同时接收数据分组。 类似于多用户 MIM0场景, 如果对波束成形矢量仔细设计, 则可以减轻或者甚至完全消除两个数 据流之间的干扰。 因此, 在第一阶段中的接收信号可以表示为:
其中. W表示第一跳, ,! · = 1,2表示 RN 1和 2的接收信号, h , i, j = ,2 是在 eNB处的天线 j'到第 i个 RN的信道增益, W是波束成形矩阵, 并且 ^和《,, = 1, 2是从 eNB到 RN 1和 2的发射信号和 AWGN。 Consider a three-node relay system composed of an eNB, an RN, and a UE each having 2 antennas, 1 antenna, and 2 antennas. In the first phase, the eNB transmits two data packets simultaneously to two RNs, where the two data packets are first weighted by the beamforming vector and the two RNs receive the data packets simultaneously. Similar to the multi-user MIM0 scenario, if the beamforming vector is carefully designed, the interference between the two data streams can be mitigated or even completely eliminated. Therefore, the received signal in the first phase can be expressed as: Where W represents the first hop, , ! = 1, 2 represents the received signal of RN 1 and 2, h , i, j = , 2 is the channel gain of the antenna j' to the ith RN at the eNB, W Is a beamforming matrix, and ^ and ",, = 1, 2 are the transmitted signals from the eNB to RNs 1 and 2 and AWGN.
RN 1和 2接收所加权的数据分组, 并且分别进行解码和解调。 由于 eNB和 RN 1
和 2之间的高质量信道, 可以认为解码和解调是完全正确的。 之后, RN 1和 2进行 再编码和再调制, 然后传送到 UE。 RNs 1 and 2 receive the weighted data packets and perform decoding and demodulation, respectively. Due to eNB and RN 1 The high quality channel between and 2 can be considered to be completely correct for decoding and demodulation. Thereafter, RNs 1 and 2 are re-encoded and re-modulated and then transmitted to the UE.
这里, 为了获得分集增益, 将改进的 SFBC用于传输信号格式, gp, 在综合 考虑从 eNB到 UE的传输数据格式之后, 基于频率方向来编码数据分组。 因此, 第 i 个 UE从协同链路的两个相邻子载波上所接收到的信号是: Here, in order to obtain the diversity gain, the improved SFBC is used for the transmission signal format, gp, and the data packet is encoded based on the frequency direction after comprehensively considering the transmission data format from the eNB to the UE. Therefore, the signals received by the i-th UE from two adjacent subcarriers of the cooperative link are:
) = ( 1)+ ) = ( 1)+
y : = (k)X] (k)- h§(k)x2'(k + 1)+ n?(k) y : = (k) X] (k)- h§(k)x 2 '(k + 1)+ n?(k)
y^(k + l) = ¾21 (k)x2(k + 1)+ h^(k)X;(k) + n^(k + 1) y^(k + l) = 3⁄4 21 (k)x 2 (k + 1)+ h^(k) X ;(k) + n^(k + 1)
其中 表示第二跳, , = l,2表示第 i个 UE的两个天线在两个子载波 k和 k+1上所接收到的信号, ,,《J = 1,2是从第 j个 RN到第 i个 UE的第 n个天线的信道 增益, h , ,, «, = l,2是从 eNB的第 j个信道到第 i个 UE的第 n个天线的组合信道, , = 1,2是从第1个1^到第1个1^的发射信号, 并且《,., = 1,2表示第 i个 UE的两 天线处的两个相邻子载波上的 AWGN。 同样, 为了支持多用户, 仍然由波束成形矢 量对来自 eNB的发射信号进行加权, 表示为:
因此, 组合信道为:
(4) 等式 (2 ) 可以表示为矩阵形式: Wherein the second hop, , = l, 2 represents the signal received by the two antennas of the i-th UE on the two sub-carriers k and k+1, , " J = 1, 2 is from the j-th RN The channel gain to the nth antenna of the i-th UE, h , ,, «, = l, 2 is the combined channel from the jth channel of the eNB to the nth antenna of the ith UE, , = 1, 2 is a transmission signal from the 1st to the 1st, and ",., = 1, 2 represents the AWGN on two adjacent subcarriers at the two antennas of the i-th UE. Similarly, in order to support multiple users, the transmit signal from the eNB is still weighted by the beamforming vector, expressed as: Therefore, the combined channel is: (4) Equation (2) can be expressed as a matrix:
(5) (5)
其中, Ηί2)Where Ηί 2 )
X = VX = V
X2 X2
" * "表示共轭转置。 因此, 信号-干扰加噪声比是:
"*" means conjugate transpose. Therefore, the signal-to-interference plus noise ratio is:
其中, , A,和 N分别表示信号功率、 干扰功率和 AWGN功率谱密度, Where, A, and N represent signal power, interference power, and AWGN power spectral density, respectively.
图 4是示出了根据本发明的在多跳中继***中利用基于波束成形的协同复 用来传送数据分组的方法的流程图。 4 is a flow chart showing a method of transmitting data packets using beamforming-based cooperative multiplexing in a multi-hop relay system in accordance with the present invention.
如图 4所示, 根据本发明的方法, 在步骤 401, 基站利用与到各个中继节点 的中继链路的信道状态信息相对应的波束成形矢量对要发送的数据分组进行加 权处理以获得第一加权后的数据分组, 并且通过所述中继链路向多个中继节点传 输第一加权后的数据分组。 然后, 在步骤 403, 多个中继节点利用相同的时频资 源将第一加权后的数据分组转发到多个用户终端。 最后, 在步骤 405, 基站利用 与到各个用户终端的直接链路的信道状态信息相对应的波束成形矢量对所述要 发送的数据分组进行加权处理以获得第二加权后的数据分组, 并且利用所述相同 的时频资源通过所述直接链路向多个用户终端传输第二加权后的数据分组。
图 5是示出了根据本发明的在多跳中继***中利用基于波束成形的协同复 用来传送数据分组的发送端设备的结构方框图。 As shown in FIG. 4, according to the method of the present invention, in step 401, the base station performs weighting processing on data packets to be transmitted by using beamforming vectors corresponding to channel state information of relay links to respective relay nodes. The first weighted data packet, and transmitting the first weighted data packet to the plurality of relay nodes through the relay link. Then, in step 403, the plurality of relay nodes forward the first weighted data packet to the plurality of user terminals by using the same time-frequency resource. Finally, in step 405, the base station performs weighting processing on the data packet to be transmitted by using a beamforming vector corresponding to channel state information of a direct link to each user terminal to obtain a second weighted data packet, and utilizes The same time-frequency resource transmits the second weighted data packet to the plurality of user terminals through the direct link. 5 is a block diagram showing the structure of a transmitting device that transmits data packets using beamforming-based cooperative multiplexing in a multi-hop relay system according to the present invention.
如图 5所示, 根据本发明的发送端设备 (例如, 基站) 包括: 第一加权处理 装置 501、 第二加权处理装置 503和传送装置 505。 第一加权处理装置 501利用与到 各个中继节点的中继链路的信道状态信息相对应的波束成形矢量对要发送的数 据分组进行加权处理以获得第一加权后的数据分组。 第二加权处理装置 503利用 与到各个用户终端的直接链路的信道状态信息相对应的波束成形矢量对所述要 发送的数据分组进行加权处理以获得第二加权后的数据分组。 传送装置 505通过 所述中继链路向多个中继节点传输第一加权后的数据分组, 以便由多个中继节点 利用相同的时频资源将第一加权后的数据分组转发到多个用户终端; 以及利用所 述相同的时频资源通过所述直接链路向多个用户终端传输第二加权后的数据分 组。 利用以上分析, 发明人对基于波束成形的协同复用方案的性能进行了仿真, 并且为了进行比较, 还基于 LTE下行链路***仿真了没有中继节点的蜂窝***和 利用频率重用的多跳中继***, 其中在本发明的方案中选择 eNB和 RN之间的协同 操作。 仿真参数设定如表 1所示。 As shown in FIG. 5, a transmitting device (e.g., a base station) according to the present invention includes: a first weighting processing device 501, a second weighting processing device 503, and a transmitting device 505. The first weighting processing means 501 performs weighting processing on the data packets to be transmitted using the beamforming vectors corresponding to the channel state information of the relay links of the respective relay nodes to obtain the first weighted data packets. The second weighting processing means 503 performs weighting processing on the data packet to be transmitted using the beamforming vector corresponding to the channel state information of the direct link to each user terminal to obtain the second weighted data packet. The transmitting device 505 transmits the first weighted data packet to the plurality of relay nodes through the relay link, so that the first weighted data packet is forwarded to the plurality of relay nodes by using the same time-frequency resource. a user terminal; and transmitting the second weighted data packet to the plurality of user terminals over the direct link by using the same time-frequency resource. Using the above analysis, the inventors simulated the performance of the beamforming-based cooperative multiplexing scheme, and for comparison, based on the LTE downlink system, simulated a cellular system without relay nodes and multi-hop using frequency reuse. Following the system, in which the cooperative operation between the eNB and the RN is selected. The simulation parameter settings are shown in Table 1.
表 1 Table 1
参数 值 Parameter value
蜂窝布局 具有环绕的六角形布局, 7个 eNodeBs, 每个 eNodeB服务 3 个小区 Cellular layout with a surrounding hexagonal layout, 7 eNodeBs, each eNodeB serves 3 cells
***带宽 10 MHz,下行链路 System bandwidth 10 MHz, downlink
ISD 500 m (3GPP 场景 1 ) ISD 500 m (3GPP Scenario 1)
eNB发射功率 46 dBm eNB transmit power 46 dBm
RN 发射功率 30 dBm RN transmit power 30 dBm
每个扇区的 RN 的 每个扇区 2个 RN 2 RN per sector of RN per sector
数量 Quantity
每个扇区的 UE的数 每个扇区 25个 UE Number of UEs per sector 25 UEs per sector
里 Inside
调度 比例公平 Scheduling proportional fairness
下行 HARQ 具有 CC 的异步 HARQ , 最大三次重传, 以及在中继***中的 逐跳 HARQ Downlink HARQ has CC's asynchronous HARQ, maximum triple retransmission, and hop-by-hop HARQ in the relay system
信道 针对 3GPP 场景 1 的 SCM城市宏高扩展角 Channel SCM City Macro Height Extension Angle for 3GPP Scenario 1
eNB天线配置 2个 Tx天线,具有在 3GPP TS 36.81 4 VI .5.1 中定义的天线图案 的
RN天线配置 1个 Tx天线和 1个 Rx天线, 均具有在 3GPP TS 36.81 4 VI .5.1 中定义的天线模式 The eNB antenna is configured with two Tx antennas having an antenna pattern as defined in 3GPP TS 36.81 4 VI .5.1 The RN antenna is configured with one Tx antenna and one Rx antenna, each having an antenna pattern defined in 3GPP TS 36.81 4 VI .5.1
UE天线配置 2个 Rx天线 (O dBi 天线增益, 全向) UE antenna configuration 2 Rx antennas (O dBi antenna gain, omnidirectional)
下行接收机 ω类型 M C Downstream receiver ω type M C
控制信道开销 z ο〕,应答 LTE: 下行链路控制信道 (DL CCH ) 的 3个符号的开销加上 等 解调参考信号的开销 Control channel overhead z ο], acknowledgment LTE: overhead of 3 symbols of the downlink control channel (DL CCH ) plus the overhead of the demodulation reference signal
CO L=Prob(R)PLLOS(R)+ [1-Prob(R)]PLNLOS(R), 对于 2GHz, ?以 km 表示. CO L=Prob(R)PL LOS (R) + [1-Prob(R)]PL NLOS (R), for 2GHz, ? Expressed in km.
穿透损耗 20dB Penetration loss 20dB
PLL0S(R)= 103.4+24.2los10(R) PL L0S (R) = 103.4+24.2los10(R)
PL匪 (R)= 131. 42.8loS10(R) PL匪(R)= 131. 42.8lo S 10(R)
场 景 1 : Prob(R)=min(0.018/R, 1)*(1-exp(-R/0.063))+exp(-R/0.063) 场景 3: Prob(R)=exp(-(R-0.01)/ 1.0) Scenario 1: Prob(R)=min(0.018/R, 1)*(1-exp(-R/0.063))+exp(-R/0.063) Scenario 3: Prob(R)=exp(-(R- 0.01) / 1.0)
L=Prob(R)PLLQS(R)+ [1-Prob(R)】PLN )S(R)-B,对于 2GHz, /?以 km 表示, 其中 L=Prob(R)PL LQS (R) + [1-Prob(R)]PL N )S (R)-B, for 2GHz, /? Expressed in km, where
PLL0S(R)= 100.7+23.5/og 10(R) PL L0S (R) = 100.7 + 23.5 / og 10 (R)
PL謹 (R)= 125.2+36.3log10(R) PL (R) = 125.2 + 36.3log10(R)
路径损 eNodeB Path loss eNodeB
耗模型 到 RN 基于 ITU模型 ProbiW: Consumption model to RN based on ITU model ProbiW:
场 景 1: Prob(R)=min(0.018/R, 1)*(1-exp(-R/0.072))+exp(-R/0.072) 情况 3: Prob(R)=exp(-(R-0.01)/ 1. 15) Scenario 1: Prob(R)=min(0.018/R, 1)*(1-exp(-R/0.072))+exp(-R/0.072) Case 3: Prob(R)=exp(-(R- 0.01) / 1. 15)
where Bonus for donor macro is set to 5dB Where Bonus for donor macro is set to 5dB
L=Prob(R) PLLQS(R)+[1-Prob(R)]PLNLOS(R), 对于 2GHz, R 以 km 表示, 其中 L=Prob(R) PL LQS (R)+[1-Prob(R)]PL NLOS (R), for 2GHz, R is expressed in km, where
PLL0S(R)= 103.8+20. /og 10(R) PL L0S (R) = 103.8+20. /og 10(R)
PLNLOS(R)= 145.4+37.5I0310(R) PL NLOS (R) = 145.4 + 37.5I0310(R)
场 景 1 : Prob(R)=0.5-min(0.5,5exp(-0. 156/R))+min(0.5,5exp(-R/0.03)) 场 景 3: Prob(R)=0.5-min(0.5, 3exp(-0.3/R))+min(0.5, 3exp(-R/0.095)) 表 2示出了利用本发明的协同复用的***仿真结果。 Scenario 1: Prob(R)=0.5-min(0.5,5exp(-0. 156/R))+min(0.5,5exp(-R/0.03)) Scenario 3: Prob(R)=0.5-min(0.5 3exp(-0.3/R))+min(0.5, 3exp(-R/0.095)) Table 2 shows the system simulation results using the cooperative multiplexing of the present invention.
表 2 Table 2
没有 RN的蜂 全频率重 所提的协同复用中继系 窝*** 用的中继 统 The bee without the RN is full frequency and the relay system for the cooperative multiplexing relay system is proposed.
*** System
小区平均频谱效率 1. 8457 2. 398 2. 6432 (43. 2%) Average spectral efficiency of the cell 1. 8457 2. 398 2. 6432 (43. 2%)
(bps/Hz/cel l) (29. 9%)
小区边缘频谱效率 0. 018 (bps/Hz/cel l) (29.9%) Cell edge spectral efficiency 0. 018
0. 017 0. 0222 (30. 58%) 0. 017 0. 0222 (30. 58%)
(bps/Hz) (5. 88%) (bps/Hz) (5. 88%)
图 6是示出了本发明的***与现有技术的比较结果的仿真示意图。 从图 6和 表 2可以看出, 本发明实现了用户吞吐量的显著提高。 这是因为一方面协同复用 获得了分集和复用的最佳折中且在不会牺牲链路鲁棒作为代价的情况下增加了 数据速率; 另一方面, 利用波束成形技术将降低多用户干扰, 并且协同技术还避 免了共信道干扰。 Figure 6 is a schematic diagram showing the simulation of the comparison between the system of the present invention and the prior art. As can be seen from Figures 6 and 2, the present invention achieves a significant increase in user throughput. This is because on the one hand, cooperative multiplexing achieves the best compromise between diversity and multiplexing and increases the data rate without sacrificing link robustness; on the other hand, beamforming technology will reduce multi-users. Interference, and cooperative techniques also avoid co-channel interference.
另外, 明显地, 根据本发明的技术方案可以扩展到在多天线场景下的到多 个 UE的多 RN协同服务。 In addition, it is apparent that the technical solution according to the present invention can be extended to multi-RN cooperative services to multiple UEs in a multi-antenna scenario.
尽管以上已经结合本发明的优选实施例示出了本发明, 但是本领域的技术 人员将会理解, 在不脱离本发明的精神和范围的情况下, 可以对本发明进行各种 修改、 替换和改变。 因此, 本发明不应由上述实施例来限定, 而应由所附权利要 求及其等价物来限定。
While the invention has been described in terms of the preferred embodiments of the present invention, it will be understood that various modifications, changes and changes may be made to the inventions without departing from the spirit and scope of the invention. Therefore, the present invention should not be limited by the foregoing embodiments, but by the appended claims and their equivalents.
Claims
1、 一种在多跳中继***中利用基于波束成形的协同复用来传送数据分组的 方法, 包括: A method for transmitting data packets by using beamforming-based cooperative multiplexing in a multi-hop relay system, comprising:
基站利用与到各个中继节点的中继链路的信道状态信息相对应的波束成形 矢量对要发送的数据分组进行加权处理以获得第一加权后的数据分组, 并且通过 所述中继链路向多个中继节点传输第一加权后的数据分组; The base station performs weighting processing on the data packet to be transmitted by using a beamforming vector corresponding to channel state information of the relay link of each relay node to obtain a first weighted data packet, and passes through the relay link Transmitting the first weighted data packet to the plurality of relay nodes;
多个中继节点利用相同的时频资源将第一加权后的数据分组转发到多个用 户终端; 以及 Multiple relay nodes forwarding the first weighted data packet to a plurality of user terminals using the same time-frequency resource;
基站利用与到各个用户终端的直接链路的信道状态信息相对应的波束成形 矢量对所述要发送的数据分组进行加权处理以获得第二加权后的数据分组, 并且 利用所述相同的时频资源通过所述直接链路向多个用户终端传输第二加权后的 数据分组。 The base station weights the data packet to be transmitted by using a beamforming vector corresponding to channel state information of a direct link to each user terminal to obtain a second weighted data packet, and utilizes the same time frequency The resource transmits the second weighted data packet to the plurality of user terminals over the direct link.
2、 根据权利要求 1所述的方法, 其中基站和相应的中继节点进行协同调度 和联合传输, 从而实现用户终端协同空间分集。 2. The method according to claim 1, wherein the base station and the corresponding relay node perform cooperative scheduling and joint transmission, thereby implementing collaborative space diversity of the user terminal.
3、 根据权利要求 1所述的方法, 其中从基站和中继节点到用户终端的数据 分组的传输采用修改后的空间频率块编码 SFBC方式来进行编码。 3. The method according to claim 1, wherein the transmission of data packets from the base station and the relay node to the user terminal is performed using a modified spatial frequency block coding SFBC mode.
4、 根据权利要求 3所述的方法, 其中用户终端利用 SFBC检测方法对接收到 的数据分组进行合并。 4. The method of claim 3, wherein the user terminal combines the received data packets using an SFBC detection method.
5、 根据权利要求 1所述的方法, 其中所述多跳中继***采用多输入多输出 5. The method of claim 1, wherein the multi-hop relay system employs multiple input multiple outputs
MIM0***。 MIM0 system.
6、 一种在多跳中继***中利用基于波束成形的协同复用来传送数据分组的 发送端设备, 包括: 6. A transmitting device for transmitting data packets by using beamforming-based cooperative multiplexing in a multi-hop relay system, comprising:
第一加权处理装置, 用于利用与到各个中继节点的中继链路的信道状态信 息相对应的波束成形矢量对要发送的数据分组进行加权处理以获得第一加权后 的数据分组; a first weighting processing apparatus, configured to perform weighting processing on a data packet to be transmitted by using a beamforming vector corresponding to channel state information of a relay link of each relay node to obtain a first weighted data packet;
第二加权处理装置, 用于利用与到各个用户终端的直接链路的信道状态信 息相对应的波束成形矢量对所述要发送的数据分组进行加权处理以获得第二加 权后的数据分组; 以及 a second weighting processing apparatus, configured to perform weighting processing on the data packet to be transmitted by using a beamforming vector corresponding to channel state information of a direct link to each user terminal to obtain a second weighted data packet;
传送装置, 用于通过所述中继链路向多个中继节点传输第一加权后的数据 分组, 以便由多个中继节点利用相同的时频资源将第一加权后的数据分组转发到 多个用户终端; 以及利用所述相同的时频资源通过所述直接链路向多个用户终端 传输第二加权后的数据分组。 a transmitting device, configured to transmit, by using the relay link, the first weighted data to multiple relay nodes Grouping, so that the first weighted data packet is forwarded to the plurality of user terminals by the plurality of relay nodes using the same time-frequency resource; and the plurality of user terminals are transmitted through the direct link by using the same time-frequency resource Transmitting the second weighted data packet.
7、 根据权利要求 6所述的发送端设备, 其中所述多跳中继***采用多输入 多输出 MIM0***。 7. The transmitting device according to claim 6, wherein the multi-hop relay system employs a multiple input multiple output MIM0 system.
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CN101167294A (en) * | 2005-02-17 | 2008-04-23 | 艾利森电话股份有限公司 | Method and device for coordinated relay |
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