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Method and apparatus for transmitting multi-user mimo reference signal in wireless communication system for supporting relay

By puncturing the DMRS modes of different receiving entities in the downlink physical resource block, the problem of inter-layer interference in multi-user MIMO operation is solved, and the accuracy and efficiency of signal reception are improved.

Inactive Publication Date: 2012-07-11
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the problem that may occur is that MU-MIMO may not perform properly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0208] In the PRB to which the downlink MU-MIMO transmission is applied (i.e., the PRB shared between the user equipment and the relay node), the initially specified "relay DMRS pattern" may be applied to the relay node, and the The same pattern as the "relay DMRS pattern" instead of the "LTE-A user equipment DMRS pattern" is initially specified to be applied to the user equipment.

[0209] As described above, when the DMRS pattern for MU-MIMO transmission of the user equipment is configured the same as for the MU-MIMO transmission of the relay node, it is possible to multiplex on the same resource element position according to the OCC-based CDM pattern. With DMRS for devices and DMRS for relay nodes. Since the DMRS for any one downlink receiving entity does not collide with the other party's data, DMRS orthogonality can be maintained.

[0210] In order to set the DMRS mode of the user equipment to "relay DMRS mode" as described above, the base station can use upper layer sig...

Embodiment approach 2

[0213] In the case that the relay node is located within the coverage of the base station (or cell), when the user equipment and the relay node perform downlink MU-MIMO operation, the initial designation can be the same as the "relay DMRS mode" instead of The same mode as the DMRS mode (LTE-A user equipment DMRS mode) is applied to the user equipment.

[0214] The base station (or cell) may individually indicate to the user equipment that there is a relay node within the coverage of the base station, where the user equipment performs MU-MIMO operation together with the corresponding relay node. In other words, the base station (or cell) can explicitly indicate to the user equipment that there is a relay node in the base station (or cell) by using upper layer signaling (for example, RRC signaling) or according to the downlink channel allocation PDCCH DCI format. A user equipment that has received signaling from a base station indicating that there is a relay node within the cov...

Embodiment approach 3

[0218] Do not apply a DMRS pattern different from the initially defined DMRS pattern to the LTE-A user equipment, and based on this, apply a different DMRS pattern to the LTE-A user equipment and the relay node, which can be compared with the above method 1 (for The method of puncturing resource element positions (or symbols) to which data and / or RSs for other parties are sent is applied in the same manner as physical resource elements described in the present invention.

[0219] In more detail, in the downlink subframe configuration for the LTE-A user equipment, the resource element position (or symbol) used for the relay node is sent to the resource element position (or symbol) for the LTE-A user equipment. Data and / or RS transmissions are punched. Likewise, in the downlink subframe configuration for the relay node, data for the relay node and / or RS transmission for punching.

[0220] The base station may pre-send information related to puncturing (or rate matching) perf...

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Abstract

The present invention relates to a wireless communication system, and more particularly to a method and an apparatus for transmitting a multi-user Multiple Input Multiple Output (MIMO) signal in a wireless communication system for supporting a relay. A method for transmitting a Demodulation Reference Signal (DMRS) for down-link multi-user MIMO transmission according to an embodiment of the prevent invention comprises the steps of: mapping a DMRS for a first layer on a down-link physical resource block according to a first DMRS pattern; mapping a DMRS for a second layer on the down-link physical resource block according to a second DMRS pattern; and transmitting the down-link physical resource block.; In the down-link physical resource block, a resource element corresponding to the second DMRS pattern can be punctured on the first layer and a resource element corresponding to the first DMRS pattern can be punctured on the second layer.

Description

technical field [0001] The present invention relates to wireless communication systems, and more particularly to a method and apparatus for transmitting a multi-user multiple-input multiple-output (MIMO) reference signal in a relay-enabled wireless communication system. Background technique [0002] figure 1 A relay node (RN) 120 and user equipments (UE) 131 and 132 existing in one base station (eNodeB; eNB) 110 in a wireless communication system 100 are shown. The relay node 120 may transmit data received from the base station 110 to the user equipment 132 therein, and transmit data received from the user equipment 132 therein to the base station 110 . Furthermore, the relay node 120 can extend high data rate areas, enhance communication quality at cell edges, and support communication within buildings or areas outside the base station's service coverage. exist figure 1 In , a user equipment such as user equipment 131 (hereinafter referred to as macro user equipment (mac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04J11/00
CPCH04L5/0048H04L5/0023H04L5/0026H04L5/0028H04L5/0032H04L5/0037H04L5/0051H04L5/0073
Owner LG ELECTRONICS INC
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