CN102158302B

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Info

Publication number: CN102158302B
Application number: CN2010101121378A
Authority: CN
Inventors: 苏昕; 缪德山; 拉盖施
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2010-02-11
Filing date: 2010-02-11
Publication date: 2013-09-18
Anticipated expiration: 2030-02-11
Also published as: CN102158302A

Abstract

The embodiment of the invention provides an information indication method, which comprises the following steps: a base station communicates with User Equipment (UE), and allocates a corresponding data stream to the UE according to the attribute of the UE; the base station sends Downlink Control Information (DCI) to the UE, wherein the DCI comprises information indications distributed by downlink transmission Rank and demodulation reference symbol (DMRS) ports; and the base station transmits the corresponding data stream to the UE through the DMRS port. According to the scheme provided by the invention, the signaling overhead is reduced through the transmission block switch and the joint coding of the NDI bit during single code word transmission, and the joint indication of the DMRS port and the total Rank is supported with smaller overhead.

Description

Translated fromChinese

一种信息指示的方法及设备Method and device for information indication

技术领域technical field

本发明涉及数字通信领域，具体而言，本发明涉及一种信息指示的方法及设备。The present invention relates to the field of digital communication, in particular, the present invention relates to a method and equipment for information indication.

背景技术Background technique

移动和宽带成为现代通信技术的发展方向，3GPP(3rd GenerationPartnership Project，第三代合作伙伴计划)致力于LTE(Long TermEvolution，长期演进)系统作为3G系统的演进，目标是发展3GPP无线接入技术向着高数据速率、低延迟和优化分组数据应用方向演进。Mobile and broadband have become the development direction of modern communication technology. 3GPP (3rd Generation Partnership Project) is committed to the evolution of LTE (Long Term Evolution, long-term evolution) system as a 3G system. The goal is to develop 3GPP wireless access technology towards Evolution for high data rate, low latency and optimized packet data applications.

在下行MIMO(Multi-input Multi-output，单用户多入多出)传输过程中，eNB将根据每个UE(User Equipment，用户设备)的信道条件、业务特点及优先级等因素为每个被调度UE分配一定数量的并行数据流，其中的每个数据流称为一层。为了支持最多8层的空间复用技术，LTE-A(LongTerm Evolution Advanced，长期演进高级)中将定义8个端口的DMRS(Demodulation Reference Symbol，解调参考符号)。DMRS采用了与数据相同的预编码处理，UE通过对DMRS的测量就可以获知预编码之后的等效信道矩阵，并进行数据解调。LTE-A下行SU-MIMO最多可以支持8层，但是从信令开销与性能增益角度考虑可能最多只支持总Rank＝4的MU-MIMO。LTE Rel-10中将会延续Rel-9中的混合SU/MU传输模式，即通过一种统一的传输模式同时支持SU(Single User，单用户)与MU-MIMO(Multiuser Multi-input Multi-output，多用户多入多出)，实现SU与MU-MIMO的动态切换。During the downlink MIMO (Multi-input Multi-output, single-user multiple-input multiple-output) transmission process, the eNB will provide each The UE is scheduled to allocate a certain number of parallel data streams, and each data stream is called a layer. In order to support up to 8 layers of spatial multiplexing technology, LTE-A (LongTerm Evolution Advanced, Long Term Evolution Advanced) will define 8 ports of DMRS (Demodulation Reference Symbol, demodulation reference symbol). The DMRS adopts the same precoding process as the data, and the UE can obtain the equivalent channel matrix after precoding by measuring the DMRS, and perform data demodulation. LTE-A downlink SU-MIMO can support up to 8 layers, but from the perspective of signaling overhead and performance gain, it may only support MU-MIMO with a total Rank=4 at most. LTE Rel-10 will continue the hybrid SU/MU transmission mode in Rel-9, that is, support SU (Single User, single user) and MU-MIMO (Multiuser Multi-input Multi-output) at the same time through a unified transmission mode , multi-user multiple-input multiple-output), to realize dynamic switching between SU and MU-MIMO.

为了实现更高的峰值速率，LTE-A的下行SU-MIMO最多可以支持8个数据层的并行传输。为了支持灵活的空间预处理技术，LTE-A下行链路将采用基于解调参考符号DMRS的传输方式。LTE Rel-10规范中将定义8个DMRS天线端口，在下行传输过程中，eNB需要通过DCI(DownlinkControl Information，下行控制信息)指示DMRS端口的分配情况。此外，由于LTE-A的DMRS采用了CDM-FDM(Code DivisionMultiplexing-Frequency Division Multiplexing，码分复用频分复用)的方式，为了使MU-MIMO传输中的UE获得正确的功率参考并正确解调下行数据，需要通过下行控制信令或其它机制使UE获知其PDSCH(Physical DownlinkShared Channel，物理下行共享信道)的每个数据层的信号功率与相应的DMRS端口的功率的比值，即功率偏移(power offset)。为了在MU-MIMO中支持MMSE(Minimum Mean Squared Error，最小均方误差)等接收算法，以更好地抑制同道干扰，不但需要指示每个被调度UE自身的DMRS天线端口分配情况，还需要在下行控制信息中通知与之共同调度的UE的端口占用情况。In order to achieve a higher peak rate, the downlink SU-MIMO of LTE-A can support parallel transmission of up to 8 data layers. In order to support flexible spatial pre-processing technology, the LTE-A downlink will adopt a transmission method based on demodulation reference symbols DMRS. Eight DMRS antenna ports will be defined in the LTE Rel-10 specification. During downlink transmission, the eNB needs to indicate the allocation of DMRS ports through DCI (Downlink Control Information, downlink control information). In addition, since the DMRS of LTE-A adopts CDM-FDM (Code Division Multiplexing-Frequency Division Multiplexing, Code Division Multiplexing Frequency Division Multiplexing), in order to enable the UE in MU-MIMO transmission to obtain the correct power reference and correctly resolve To adjust the downlink data, it is necessary to let the UE know the ratio of the signal power of each data layer of its PDSCH (Physical Downlink Shared Channel) to the power of the corresponding DMRS port through downlink control signaling or other mechanisms, that is, the power offset (power offset). In order to support receiving algorithms such as MMSE (Minimum Mean Squared Error) in MU-MIMO to better suppress co-channel interference, it is not only necessary to indicate the DMRS antenna port allocation of each scheduled UE itself, but also to The downlink control information notifies the port occupancy status of the co-scheduled UE.

图1中给出了LTE-A中目前已经确定了Rank1-4时的DMRS图样。Rank5-8的DMRS图样目前正在讨论中，但基本可以确定Rank5-8的DMRS图样中，各个DMRS天线端口将通过CDM-FDM的方式进行复用。图2中给出了Rank5-8的DMRS图样示例。Figure 1 shows the DMRS pattern when Rank1-4 has been determined in LTE-A. The DMRS pattern of Rank5-8 is currently under discussion, but it can be basically determined that in the DMRS pattern of Rank5-8, each DMRS antenna port will be multiplexed through CDM-FDM. An example of a DMRS pattern for Rank5-8 is given in Figure 2.

下行传输过程中eNB需要通过下行控制信息指示被调度UE的DMRS端口分配情况，从信令开销的角度考虑，不需要支持完全灵活的端口指示方式，一般只需要考虑每种总Rank时的几种端口组合即可。表1中给出了一种利用3比特控制信息以及单码字传输时空余的NDI比特共同指示DMRS分配情况的方案，记为方案1。During the downlink transmission process, the eNB needs to indicate the DMRS port allocation of the scheduled UE through the downlink control information. From the perspective of signaling overhead, it does not need to support a completely flexible port indication method. Generally, it only needs to consider several types of ports for each total Rank. port combinations. Table 1 shows a scheme of using 3-bit control information and spare NDI bits during single codeword transmission to jointly indicate the DMRS allocation situation, which is marked as scheme 1.

表1.DMRS端口3比特指示Table 1. DMRS port 3-bit indication

LTE Rel-8中只定义了单端口的解调导频，即端口5。Rel-9中则将DMRS扩展为双端口，端口7和端口8通过CDM方式复用。在Rel-8与Rel-9中，UE在解调时可以假设PDSCH中各层的数据RE功率与对应的DMRS端口功率相同，因此不需要额外的指示两者之间的功率偏移。但是在LTE Rel-10中，由于多个DMRS端口会采用CDM-FDM的方式，因此可能会出现DMRS端口与所对应的数据层之间的功率不相等的情况。为了使UE在接收下行数据时获得正确的功率参考，需要通过某种控制信令显式或隐式地指示各数据层的信号功率与对应DMRS端口功率的比值。In LTE Rel-8, only a single-port demodulation pilot, namely port 5, is defined. In Rel-9, DMRS is extended to dual ports, and port 7 and port 8 are multiplexed through CDM. In Rel-8 and Rel-9, the UE can assume that the data RE power of each layer in the PDSCH is the same as the corresponding DMRS port power during demodulation, so there is no need to additionally indicate the power offset between the two. However, in LTE Rel-10, since multiple DMRS ports will adopt the CDM-FDM method, there may be situations where the power between the DMRS port and the corresponding data layer is not equal. In order for the UE to obtain a correct power reference when receiving downlink data, it is necessary to explicitly or implicitly indicate the ratio of the signal power of each data layer to the power of the corresponding DMRS port through some control signaling.

由图1与图2可知，根据总的下行传输层数，每个PRB对中DMRS可能会占用12或24个RE，分别记为pattern1或pattern2。UE进行数据解调时不但需要获知其自身的DMRS端口分配，还需要获知总的DMRSpattern，这样才能确定可能用于DMRS的RE是否被其他共同调度的UE所占用，并确定是否需要避免对上述RE进行检测。因此下行控制信令中需要对所使用的DMRS pattern进行指示。表2中给出了一种联合指示DMRS pattern与端口分配的方案，记为方案2。It can be known from Fig. 1 and Fig. 2 that, according to the total number of downlink transmission layers, DMRS in each PRB pair may occupy 12 or 24 REs, which are respectively recorded as pattern1 or pattern2. When the UE performs data demodulation, it not only needs to know its own DMRS port allocation, but also needs to know the overall DMRS pattern, so as to determine whether the REs that may be used for DMRS are occupied by other co-scheduled UEs, and determine whether it is necessary to avoid the allocation of the above REs to test. Therefore, the DMRS pattern used needs to be indicated in the downlink control signaling. Table 2 provides a scheme for joint indication of DMRS pattern and port allocation, which is denoted asscheme 2.

表2.DMRS pattern与端口分配联合4比特指示Table 2. DMRS pattern and port allocation joint 4-bit indication

总Rank＝1，Pattern 1Total Rank=1, Pattern 1 {0}或{1}{0} or {1} 2种状态2 states 总Rank 2，Pattern 1Overall Rank 2, Pattern 1 {0，1}{0, 1} 1种状态1 state 总Rank 1，Pattern 2Total Rank 1, Pattern 2 {0}或{1}或{2}或{3}{0} or {1} or {2} or {3} 4种状态4 states 总Rank 2，Pattern 2Total Rank 2, Pattern 2 {0，1}或{2，3}{0, 1} or {2, 3} 2种状态2 states 总Rank 3，Pattern 2Total Rank 3, Pattern 2 {0，1，2}{0, 1, 2} 1种状态1 state 总Rank 4，Pattern 2Overall Rank 4, Pattern 2 {0，1，2，3}{0, 1, 2, 3} 1种状态1 state 总Rank 5-8，Pattern 2Overall Rank 5-8,Pattern 2 一对一映射one-to-onemapping 4种状态4 states

从上述现有技术可以看出存在以下缺点：Can find out from above-mentioned prior art that there is following shortcoming:

(1)方案1引入3比特开销用于UE自身的DMRS端口分配情况的指示，这种方案利用了单码字传输时空余的NDI比特来减少开销。但是这一方案无法指示单码字重传时的端口分配情况，例如SU-MIMO的Rank5初次传输中，码字1被映射到2层中而码字2被映射到3层中进行传输，如果码字2对应的三层发生错误，需要单独进行重传，则表1中没有任何一种情况可以与之对应。类似的问题还会发生在单码字层2或层4的重传过程中。此外，根据表1所列的情况，UE无法通过DCI获得完整的DMRSpattern/总Rank或者功率偏移信息，如果需要额外通知这些信息，还需要很大的开销；(1) Solution 1 introduces a 3-bit overhead to indicate the DMRS port allocation of the UE itself. This solution utilizes the vacant NDI bits during single codeword transmission to reduce the overhead. However, this scheme cannot indicate the port allocation when a single codeword is retransmitted. For example, in the initial transmission of Rank5 of SU-MIMO, codeword 1 is mapped tolayer 2 andcodeword 2 is mapped to layer 3 for transmission. If The third layer corresponding tocodeword 2 has an error and needs to be retransmitted separately, and none of the situations in Table 1 can correspond to it. Similar problems also occur in the retransmission process ofsingle codeword layer 2 orlayer 4. In addition, according to the situations listed in Table 1, the UE cannot obtain the complete DMRSpattern/total Rank or power offset information through DCI, and if additional notification of such information is required, a large overhead is required;

(2)方案2可以利用4比特实现DMRS端口与DMRS pattern的联合指示，但是这种方法不能指示总的Rank，因此不能支持MMSE、ZF及SIC类接收算法，而且也不能通过表3所列的指示信息获取PO指示。(2)Scheme 2 can use 4 bits to realize the joint indication of DMRS port and DMRS pattern, but this method cannot indicate the total Rank, so it cannot support MMSE, ZF and SIC receiving algorithms, and cannot pass the DMRS listed in Table 3 The instruction information obtains the PO instruction.

因此，有必要提出一种能够实现天线端口分配与总Rank联合指示的方法，通过现有的控制信息发送方法，以较小的开销支持DMRS端口与总Rank的联合指示。Therefore, it is necessary to propose a method capable of realizing joint indication of antenna port allocation and overall Rank, and support the joint indication of DMRS port and overall Rank with relatively small overhead through the existing control information transmission method.

发明内容Contents of the invention

本发明的目的旨在至少解决上述技术缺陷之一，特别对通过传输块开关以及单码字传输时NDI比特的联合编码降低信令开销，实现以较小的开销支持DMRS端口与总Rank的联合指示。The purpose of the present invention is to at least solve one of the above-mentioned technical defects, especially to reduce the signaling overhead for the joint coding of NDI bits through the transmission block switch and single codeword transmission, and realize the joint support of DMRS port and total Rank with a small overhead instruct.

为了达到上述目的，本发明的实施例一方面提出了一种信息指示的方法，包括以下步骤：In order to achieve the above purpose, an embodiment of the present invention provides an information indication method on the one hand, including the following steps:

基站与用户设备UE进行通信，根据所述UE的属性为所述UE分配相应的数据流；所述基站向所述UE发送下行控制信息DCI，所述DCI包括下行传输Rank与解调参考符号DMRS端口分配的信息指示；所述基站通过所述DMRS端口将所述相应的数据流发送给所述UE。The base station communicates with the user equipment UE, and allocates a corresponding data flow for the UE according to the attributes of the UE; the base station sends downlink control information DCI to the UE, and the DCI includes a downlink transmission Rank and a demodulation reference symbol DMRS Port allocation information indication; the base station sends the corresponding data flow to the UE through the DMRS port.

本发明的实施例另一方面还提出了一种信息指示的方法，包括以下步骤：On the other hand, the embodiment of the present invention also proposes a method for information indication, including the following steps:

用户设备UE与基站进行通信，所述基站根据所述UE的属性为所述UE分配相应的数据流；所述UE接收所述基站发送的下行控制信息DCI，所述DCI包括下行传输Rank与解调参考符号DMRS端口分配的信息指示；所述UE通过所述DMRS端口接收所述基站发送的所述相应的数据流。The user equipment UE communicates with the base station, and the base station allocates a corresponding data flow for the UE according to the attributes of the UE; the UE receives the downlink control information DCI sent by the base station, and the DCI includes downlink transmission Rank and solution The information indicating the allocation of the reference symbol DMRS port; the UE receives the corresponding data stream sent by the base station through the DMRS port.

本发明的实施例另一方面还提出了一种基站，包括收发模块和编码模块，On the other hand, the embodiment of the present invention also proposes a base station, including a transceiver module and a coding module,

所述编码模块，用于将向用户设备UE发送下行控制信息DCI进行编码，所述DCI包括下行传输Rank与解调参考符号DMRS端口分配的信息指示；所述收发模块，用于与所述UE进行通信，根据所述UE的属性为所述UE分配相应的数据流，以及通过所述DMRS端口将所述相应的数据流发送给所述UE。The encoding module is configured to encode the downlink control information DCI sent to the user equipment UE, the DCI includes downlink transmission Rank and demodulation reference symbol DMRS port allocation information indication; the transceiver module is configured to communicate with the UE performing communication, assigning a corresponding data flow to the UE according to the attribute of the UE, and sending the corresponding data flow to the UE through the DMRS port.

本发明的实施例另一方面还提出了一种用户设备UE，包括收发模块和译码模块，On the other hand, the embodiment of the present invention also proposes a user equipment UE, including a transceiver module and a decoding module,

所述译码模块，用于根据基站发送的下行控制信息DCI，译码得到下行传输Rank与解调参考符号DMRS端口分配的信息指示；所述收发模块，用于与基站进行通信，所述基站根据所述UE的属性为所述UE分配相应的数据流，以及通过所述DMRS端口接收所述基站发送的所述相应的数据流。The decoding module is used to decode the downlink control information DCI sent by the base station to obtain the information indication of downlink transmission Rank and demodulation reference symbol DMRS port allocation; the transceiver module is used to communicate with the base station, and the base station Allocating a corresponding data stream to the UE according to the attribute of the UE, and receiving the corresponding data stream sent by the base station through the DMRS port.

本发明提出的上述方案，通过传输块开关以及单码字传输时NDI比特的联合编码降低信令开销，实现以较小的开销支持DMRS端口与总Rank的联合指示。本发明提出的上述方案，对现有系统的改动很小，不会影响系统的兼容性，而且实现简单、高效。The above solution proposed by the present invention reduces signaling overhead through transmission block switching and joint encoding of NDI bits during single codeword transmission, and realizes supporting joint indication of DMRS port and total Rank with relatively small overhead. The above-mentioned solution proposed by the present invention requires little modification to the existing system, does not affect the compatibility of the system, and is simple and efficient to implement.

本发明附加的方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

附图说明Description of drawings

本发明上述的和/或附加的方面和优点从下面结合附图对实施例的描述中将变得明显和容易理解，其中：The above and/or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

图1为Rank1-4时的DMRS图样示意图；Figure 1 is a schematic diagram of the DMRS pattern at Rank1-4;

图2为Rank5-8时的DMRS图样示意图；Figure 2 is a schematic diagram of the DMRS pattern at Rank5-8;

图3为本发明实施例一种信息指示的方法的流程图；FIG. 3 is a flow chart of a method for information indication according to an embodiment of the present invention;

图4为本发明另一实施例一种信息指示的方法的流程图；FIG. 4 is a flow chart of an information indication method according to another embodiment of the present invention;

图5为本发明实施例信息指示设备的结构示意图。Fig. 5 is a schematic structural diagram of an information indication device according to an embodiment of the present invention.

具体实施方式Detailed ways

下面详细描述本发明的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本发明，而不能解释为对本发明的限制。Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

为了实现本发明之目的，本发明公开了一种信息指示的方法，包括以下步骤：基站与用户设备UE进行通信，根据所述UE的属性为所述UE分配相应的数据流；所述基站向所述UE发送下行控制信息DCI，所述DCI包括下行传输Rank与解调参考符号DMRS端口分配的信息指示；所述基站通过所述DMRS端口将所述相应的数据流发送给所述UE。In order to achieve the purpose of the present invention, the present invention discloses a method for information indication, including the following steps: the base station communicates with the user equipment UE, and allocates a corresponding data stream for the UE according to the attributes of the UE; The UE sends downlink control information DCI, and the DCI includes downlink transmission Rank and DMRS port allocation information indication; the base station sends the corresponding data stream to the UE through the DMRS port.

如图3所示，为本发明实施例一种信息指示的方法的流程图，包括以下步骤：As shown in FIG. 3, it is a flowchart of a method for information indication according to an embodiment of the present invention, including the following steps:

S301：基站与用户设备UE进行通信。S301: The base station communicates with the user equipment UE.

在步骤S301中，基站与用户设备UE进行通信，根据UE的属性为UE分配相应的数据流。In step S301, the base station communicates with the user equipment UE, and allocates corresponding data streams to the UE according to the attributes of the UE.

具体而言，在下行MIMO传输过程中，eNB将根据每个UE的信道条件、业务特点及优先级等因素为每个被调度UE分配一定数量的并行数据流，其中的每个数据流称为一层。Specifically, during the downlink MIMO transmission process, the eNB will allocate a certain number of parallel data streams to each scheduled UE according to factors such as channel conditions, service characteristics, and priorities of each UE, and each data stream is called layer.

S302：基站向UE发送下行控制信息DCI，其中DCI包括下行传输Rank与DMRS端口分配的信息指示。S302: The base station sends downlink control information DCI to the UE, wherein the DCI includes downlink transmission Rank and DMRS port allocation information indication.

在步骤S302中，基站向所述UE发送下行控制信息DCI，所述DCI包括下行传输Rank与解调参考符号DMRS端口分配的信息指示。In step S302, the base station sends downlink control information DCI to the UE, and the DCI includes downlink transmission Rank and information indication of DMRS port allocation for demodulation reference symbols.

具体而言，下行传输Rank与解调参考符号DMRS端口分配的信息指示包括以下一种或多种信息：Specifically, the information indication of downlink transmission Rank and demodulation reference symbol DMRS port allocation includes one or more of the following information:

下行传输总的Rank与DMRS端口分配的组合信息；Downlink transmission of the combined information of total Rank and DMRS port allocation;

所述UE使用DMRS端口的信息；The UE uses the information of the DMRS port;

下行传输总的Rank与DMRS端口分配的组合和各个码分复用CDM组的功率偏移量的关系信息。The downlink transmits the combination of the total Rank and DMRS port allocation and the relationship information of the power offset of each code division multiplexing CDM group.

下面对上述信息进行展开说明。The above information is described below.

本发明的技术方案中，首先需要定义总的下行Rank与总的DMRS端口分配情况的对应关系，通过这一定义使下行Rank数与被占用的DMRS端口集合之间建立一一对应关系。根据这一对应关系，UE可以由DCI信息中的总Rank数唯一确定当前下行传输中使用的DMRS集合，其中包含了该UE自己使用的DMRS端口与其他所有共同调度UE所使用的DMRS端口号。表3中给出了这样一种对应关系的示例。In the technical solution of the present invention, it is first necessary to define the corresponding relationship between the total downlink Rank and the total DMRS port allocation, and establish a one-to-one correspondence between the number of downlink Ranks and the set of occupied DMRS ports through this definition. According to this correspondence, the UE can uniquely determine the DMRS set used in the current downlink transmission from the total Rank number in the DCI information, which includes the DMRS port numbers used by the UE itself and the DMRS port numbers used by all other co-scheduled UEs. An example of such a correspondence is given in Table 3.

表3.下行传输Rank与DMRS端口占用的对应关系示例Table 3. An example of the corresponding relationship between downlink transmission Rank and DMRS port occupancy

总RankTotal Rank DMRS端口占用情况DMRS port occupancy 1 1 {0}{0} 2 2 {0，1}{0, 1} 33 {0，2，3}{0, 2, 3} 44 {0，1，2，3}{0, 1, 2, 3} 55 {0，1，2，3，6}{0, 1, 2, 3, 6} 66 {0，1，4，2，3，6}{0, 1, 4, 2, 3, 6} 77 {0，1，4，2，3，6}{0, 1, 4, 2, 3, 6} 8 8 {0，1，4，5，2，3，6，7}{0, 1, 4, 5, 2, 3, 6, 7}

本实施例采用总Rank数与DMRS端口分配联合指示的方式，因此需要定义所支持的下行总Rank与DMRS端口分配的组合。根据上述定义，UE接收到相应的指示信息之后，便能够判断出当前下行传输的总Rank数，以及其自身所使用的DMRS端口集合。表4-1中给出了最大MU Rank数限制为4时上述组合关系的一个例子，表4-2中给出了最大MU Rank数为2时的组合示例。This embodiment adopts the method of jointly indicating the total Rank number and DMRS port allocation, so it is necessary to define the supported combination of downlink total Rank and DMRS port allocation. According to the above definition, after receiving the corresponding indication information, the UE can determine the total Rank number of the current downlink transmission and the set of DMRS ports used by itself. Table 4-1 gives an example of the above combination relationship when the maximum MU Rank number is limited to 4, and Table 4-2 gives an example of the combination when the maximum MU Rank number is 2.

表4-1.端口指示与下行Rank的组合(最大MU-MIMO Rank＝4)Table 4-1. Combination of Port Indication and Downlink Rank (Maximum MU-MIMO Rank=4)

总RankTotal Rank 组合数量Number of combinations 可用的端口分配方式Available port allocation methods 1 1 1 1 {0}{0} 2 2 33 {0}{1}{0，1}{0}{1}{0, 1} 33 55 {0}{1}{2}{0，1}{0，2，3}{0}{1}{2}{0, 1}{0, 2, 3} 44 77 {0}{1}{2}{3}{0，1}{2，3}{0，1，2，3}{0}{1}{2}{3}{0, 1}{2, 3}{0, 1, 2, 3} 55 1 1 {0，1，2，3，6}{0, 1, 2, 3, 6} 66 1 1 {0，1，2，3，4，6}{0, 1, 2, 3, 4, 6} 77 1 1 {0，1，2，3，4，6，7}{0, 1, 2, 3, 4, 6, 7} 8 8 1 1 {0，1，2，3，4，5，6，7}{0, 1, 2, 3, 4, 5, 6, 7}

表4-2.端口指示与下行Rank的组合(最大MU-MIMO Rank＝2)Table 4-2. Combination of Port Indication and Downlink Rank (Maximum MU-MIMO Rank=2)

总RankTotal Rank 组合数量Number of combinations 可用的端口分配方式Available port allocation methods 1 1 1 1 {0}{0} 2 2 33 {0}{1}{0，1}{0}{1}{0, 1} 33 1 1 {0，2，3}{0, 2, 3} 44 1 1 {0，1，2，3}{0, 1, 2, 3} 55 1 1 {0，1，2，3，6}{0, 1, 2, 3, 6} 66 1 1 {0，1，2，3，4，6}{0, 1, 2, 3, 4, 6} 77 1 1 {0，1，2，3，4，6，7}{0, 1, 2, 3, 4, 6, 7} 8 8 1 1 {0，1，2，3，4，5，6，7}{0, 1, 2, 3, 4, 5, 6, 7}

为了使UE获得各层数据的正确功率参考信息，本实施例中定义了总Rank与DMRS端口分配组合和各CDM组中功率偏移量之间的关系。UE根据上述信息便可直接判断出各数据层相对于对应的DMRS端口的功率偏移，而不需要额外的控制信息专门用于功率偏移指示。功率偏移取值范围与MU-MIMO的维数有紧密的关系。从性能增益角度考虑，Rel-10中MU-MIMO可能最多支持4个基于正交DMRS的数据层的并行传输，而MU-MIMO传输中的每个UE最多可以支持5层。按照上述假设，表5-1中给出了最大MU Rank数为2时功率偏移取值的一个实例。其中每个CDM组中包含的DMRS端口集合将在规范中定义，表5-2给出了最大MU Rank数为2时的实力。从表5中可以看出，如果要在方案1的基础上再补充功率指示信息，可能还需要引入额外的开销。In order to enable the UE to obtain correct power reference information for each layer of data, the present embodiment defines the relationship between the total Rank, the DMRS port allocation combination and the power offset in each CDM group. Based on the above information, the UE can directly determine the power offset of each data layer relative to the corresponding DMRS port, without requiring additional control information for power offset indication. The value range of the power offset is closely related to the dimension of MU-MIMO. From the perspective of performance gain, MU-MIMO in Rel-10 may support parallel transmission of up to four orthogonal DMRS-based data layers, and each UE in MU-MIMO transmission may support up to five layers. According to the above assumptions, Table 5-1 gives an example of the value of the power offset when the maximum MU Rank number is 2. The set of DMRS ports included in each CDM group will be defined in the specification. Table 5-2 shows the strength when the maximum MU Rank number is 2. It can be seen from Table 5 that if the power indication information is to be supplemented on the basis of solution 1, additional overhead may need to be introduced.

表5-1各CDM组中的功率偏移(最大MU-MIMO Rank＝4)Table 5-1 Power offset in each CDM group (maximum MU-MIMO Rank=4)

下行总RankDownlink Total Rank DMRS CDM组1中的层数Number of layers in DMRS CDM group 1 DMRS CDM组2中的层数Number of layers inDMRS CDM group 2 DMRS CDM组1中的功率偏移Power Offset in DMRS CDM Group 1 DMRS CDM组2中的功率偏移Power Offset inDMRS CDM Group 2 1 1 1 1 00 1 1 N/AN/A 1 1 00 1 1 N/AN/A 1 1 2 2 2 2 00 1 1 N/AN/A 2 2 00 2 2 N/AN/A 1 1 33 2 2 1 1 1.51.5 33 33 1 1 2 2 33 1.51.5 44 2 2 2 2 2 2 2 2

表5-2各CDM组中的功率偏移(最大MU-MIMO Rank＝2)Table 5-2 Power offset in each CDM group (maximum MU-MIMO Rank=2)

下行总RankDownlink Total Rank DMRS CDM组1中的层数Number of layers in DMRS CDM group 1 DMRS CDM组2中的层数Number of layers inDMRS CDM group 2 DMRS CDM组1中的功率偏移Power Offset in DMRS CDM Group 1 DMRS CDM组2中的功率偏移Power Offset inDMRS CDM Group 2 1 1 1 1 00 1 1 N/AN/A 1 1 00 1 1 N/AN/A 1 1 2 2 2 2 00 1 1 N/AN/A 2 2 00 2 2 N/AN/A 1 1

定义了下行总Rank与DMRS端口分配的组合之后，需要通过特定的控制信息表示上述状态组合。本实施例中在下行DCI中引入总Rank及DMRS端口指示信息域，假设总Rank与DMRS端口分配的组合总共包含M种状态，且未采用任何压缩编码方式，则总Rank及DMRS端口指示信息为

为了降低信令开销，可以通过与DCI中的其他信息进行联合编码。例如某个UE的Rank大于等于2时，数据的传输一般采用两个码字。如果某个传输块发生错误需要进行重传，而另一个传输块没有数据传输，则需要采用单码字传输。传输块的开关通过DCI中的调制编码方式(MCS)以及冗余版本(rv)信息联合指示。同时单码字传输时，DCI中与被关闭码字对应的NDI比特便空余出来。为了降低控制信令的开销，可以利用码字开关以及单码字传输时空余码字的NDI比特与新引入的控制信息进行联合编码，通过码字开关、单码字传输时空余码字的NDI比特与新的信息域进行联合编码，用于指示下行传输总的Rank与DMRS端口分配。考虑到Rank大于1单码字重传的场景，联合编码的设计中，必须包含对单码字多层传输的指示信息。表6-1中给出了按照上述实施例进行联合编码指示下行总Rank与DMRS端口分配的组合的一个实例(最大MU-MIMO Rank＝4)，从这个例子中可以看出，需要引入4比特的额外开销。相对于方案2来讲，控制开销相同，但本实施例提供的信息量更为丰富(总Rank与功率偏移)。最大MU Rank＝2时的例子由表6-2给出。After defining the combination of downlink total Rank and DMRS port allocation, specific control information needs to be used to indicate the above combination of states. In this embodiment, the total Rank and DMRS port indication information domains are introduced into the downlink DCI. Assuming that the combination of the total Rank and DMRS port allocation contains M states in total, and no compression coding method is used, the total Rank and the DMRS port indication information are:

In order to reduce signaling overhead, it can be jointly coded with other information in the DCI. For example, when the Rank of a certain UE is greater than or equal to 2, two codewords are generally used for data transmission. If an error occurs in a transmission block and needs to be retransmitted, but there is no data transmission in another transmission block, single codeword transmission is required. The switch of the transport block is jointly indicated by the modulation coding scheme (MCS) and the redundancy version (rv) information in the DCI. At the same time, when a single codeword is transmitted, the NDI bits corresponding to the closed codeword in the DCI are free. In order to reduce the overhead of control signaling, codeword switches and the NDI bits of the spare codewords during single-codeword transmission can be used for joint encoding with the newly introduced control information. The bits are jointly coded with the new information field, which is used to indicate the total Rank and DMRS port allocation for downlink transmission. Considering the scenario where the Rank is greater than 1 and the single codeword is retransmitted, the design of the joint coding must include the instruction information for the multi-layer transmission of the single codeword. Table 6-1 shows an example (maximum MU-MIMO Rank=4) of joint encoding indicating the combination of downlink total Rank and DMRS port allocation according to the above embodiment. It can be seen from this example that 4 bits need to be introduced additional overhead. Compared withsolution 2, the control overhead is the same, but the amount of information provided by this embodiment is richer (total Rank and power offset). An example when the maximum MU Rank=2 is given in Table 6-2.

表6-1.利用TB开关/空闲TB的NDI比特与总Rank及DMRS端口指示的联合编码示例(最大MU-MIMO Rank＝4)Table 6-1. Example of joint encoding using NDI bits of TB switch/idle TB with total Rank and DMRS port indication (maximum MU-MIMO Rank=4)

表6-2.利用TB开关/空闲TB的NDI比特与总Rank及DMRS端口指示的联合编码示例(最大MU-MIMO Rank＝2)Table 6-2. Example of joint encoding using NDI bits of TB switch/idle TB with total Rank and DMRS port indication (maximum MU-MIMO Rank=2)

S303：基站通过DMRS端口向UE发送数据。S303: The base station sends data to the UE through the DMRS port.

在步骤S303中，基站通过所述在步骤S302中确定的DMRS端口将所述相应的数据流发送给所述UE。In step S303, the base station sends the corresponding data stream to the UE through the DMRS port determined in step S302.

如图4所示，为本发明另一实施例一种信息指示的方法的流程图，包括以下步骤：As shown in FIG. 4, it is a flowchart of an information indication method according to another embodiment of the present invention, including the following steps:

S401：用户设备UE与基站进行通信。S401: A user equipment UE communicates with a base station.

在步骤S401中，用户设备UE与基站进行通信，基站根据UE的属性为UE分配相应的数据流。In step S401, the user equipment UE communicates with the base station, and the base station allocates a corresponding data flow for the UE according to the attributes of the UE.

S402：UE接收基站发送下行控制信息DCI，其中DCI包括下行传输Rank与DMRS端口分配的信息指示。S402: The UE receives downlink control information DCI sent by the base station, wherein the DCI includes downlink transmission Rank and DMRS port allocation information indication.

在步骤S402中，UE接收基站发送的下行控制信息DCI，DCI包括下行传输Rank与解调参考符号DMRS端口分配的信息指示。In step S402, the UE receives downlink control information DCI sent by the base station, and the DCI includes downlink transmission Rank and information indication of DMRS port allocation for demodulation reference symbols.

为了使UE获得各层数据的正确功率参考信息，本实施例中定义了总Rank与DMRS端口分配组合和各CDM组中功率偏移量之间的关系。UE根据上述信息便可直接判断出各数据层相对于对应的DMRS端口的功率偏移，而不需要额外的控制信息专门用于功率偏移指示。功率偏移取值范围与MU-MIMO的维数有紧密的关系。从性能增益角度考虑，Rel-10中MU-MIMO可能最多支持4个基于正交DMRS的数据层的并行传输，而MU-MIMO传输中的每个UE最多可以支持5层。按照上述假设，表5-1中给出了最大MU Rank数为2时功率偏移取值的一个实例。其中每个CDM组中包含的DMRS端口集合将在规范中定义，表5-2给出了最大MU Rank数为2时的实力。从表5中可以看出，如果要在方案1的基础上再补充功率指示信息，可能还需要引入额外的开销。In order to enable the UE to obtain correct power reference information for each layer of data, the present embodiment defines the relationship between the total Rank, the DMRS port allocation combination and the power offset in each CDM group. According to the above information, the UE can directly determine the power offset of each data layer relative to the corresponding DMRS port, without requiring additional control information for power offset indication. The value range of the power offset is closely related to the dimension of MU-MIMO. From the perspective of performance gain, MU-MIMO in Rel-10 may support parallel transmission of up to 4 orthogonal DMRS-based data layers, and each UE in MU-MIMO transmission can support up to 5 layers. According to the above assumptions, Table 5-1 gives an example of the value of the power offset when the maximum MU Rank number is 2. The set of DMRS ports included in each CDM group will be defined in the specification. Table 5-2 shows the strength when the maximum MU Rank number is 2. It can be seen from Table 5 that if the power indication information is to be supplemented on the basis of solution 1, additional overhead may need to be introduced.

S403：UE通过DMRS端口接收基站发送的数据。S403: The UE receives the data sent by the base station through the DMRS port.

在步骤S403中，UE通过所述在步骤S402中确定的DMRS端口接收基站发送的所述相应的数据流。In step S403, the UE receives the corresponding data stream sent by the base station through the DMRS port determined in step S402.

相应与上述方法，如图5所示，本发明实施例还提出了一种基站100和用户设备200。Corresponding to the above method, as shown in FIG. 5 , the embodiment of the present invention also proposes a base station 100 and a user equipment 200 .

其中，基站100，包括收发模块110和编码模块120。Wherein, the base station 100 includes atransceiver module 110 and acoding module 120 .

编码模块120用于将向用户设备UE200发送下行控制信息DCI进行编码，DCI包括下行传输Rank与解调参考符号DMRS端口分配的信息指示；Theencoding module 120 is configured to encode the downlink control information DCI sent to the user equipment UE200, and the DCI includes the information indication of downlink transmission Rank and demodulation reference symbol DMRS port allocation;

收发模块110用于与UE200进行通信，根据UE200的属性为UE200分配相应的数据流，以及通过DMRS端口将相应的数据流发送给UE200。Thetransceiver module 110 is used for communicating with the UE200, assigning corresponding data streams to the UE200 according to the attributes of the UE200, and sending the corresponding data streams to the UE200 through the DMRS port.

UE200使用DMRS端口的信息；UE200 uses DMRS port information;

具体而言，在下行DCI信令中引入新的信息域，用于指示下行传输总的Rank与DMRS端口分配的组合信息。Specifically, a new information field is introduced into the downlink DCI signaling, which is used to indicate the combined information of the total Rank of downlink transmission and DMRS port allocation.

具体而言，通过码字开关、单码字传输时空余码字的NDI比特与新的信息域进行联合编码，用于指示下行传输总的Rank与DMRS端口分配。Specifically, through the codeword switch, the NDI bits of the spare codeword during single codeword transmission and the new information field are jointly coded to indicate the total Rank and DMRS port allocation for downlink transmission.

用户设备UE200，包括收发模块210和译码模块220。The user equipment UE200 includes atransceiver module 210 and adecoding module 220 .

其中，译码模块220用于根据基站100发送的下行控制信息DCI，译码得到下行传输Rank与解调参考符号DMRS端口分配的信息指示；Wherein, thedecoding module 220 is used to decode the downlink transmission Rank and demodulation reference symbol DMRS port allocation information indication according to the downlink control information DCI sent by the base station 100;

收发模块210用于与基站100进行通信，基站100根据UE的属性为UE分配相应的数据流，以及通过DMRS端口接收基站100发送的相应的数据流。Thetransceiver module 210 is used for communicating with the base station 100. The base station 100 allocates corresponding data streams to UEs according to the attributes of the UEs, and receives corresponding data streams sent by the base station 100 through the DMRS port.

UE使用DMRS端口的信息；Information about the UE using the DMRS port;

具体而言，通过码字开关、单码字传输时空余码字的NDI比特与新的信息域进行联合译码，用于指示下行传输总的Rank与DMRS端口分配。Specifically, through the codeword switch, the NDI bits of the spare codeword during single codeword transmission and the new information field are jointly decoded to indicate the total Rank and DMRS port allocation for downlink transmission.

本发明提出的上述方案，通过传输块开关以及单码字传输时NDI比特的联合编码降低信令开销，实现以较小的开销支持DMRS端口与总Rank的联合指示。本发明提出的上述方案，对现有系统的改动很小，不会影响系统的兼容性，而且实现简单、高效。The above scheme proposed by the present invention reduces signaling overhead through transmission block switching and joint encoding of NDI bits during single codeword transmission, and realizes joint indication of DMRS port and total Rank with relatively small overhead. The above-mentioned solution proposed by the present invention requires little modification to the existing system, does not affect the compatibility of the system, and is simple and efficient to implement.

本领域普通技术人员可以理解实现上述实施例方法携带的全部或部分步骤是可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，该程序在执行时，包括方法实施例的步骤之一或其组合。Those of ordinary skill in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the program can be executed when executed , including one or a combination of the steps of the method embodiment.

另外，在本发明各个实施例中的各功能单元可以集成在一个处理模块中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。所述集成的模块如果以软件功能模块的形式实现并作为独立的产品销售或使用时，也可以存储在一个计算机可读取存储介质中。In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, each unit may exist separately physically, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. If the integrated modules are realized in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium.

上述提到的存储介质可以是只读存储器，磁盘或光盘等。The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like.

以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.