Method and system for notifying layer mapping information under multi-user multiple input multiple output mode

A technology for mapping information and multiple inputs, which is applied to the notification and system fields of layer mapping information under the multi-user, multiple-input and multiple-output mode. Interference effect

Active Publication Date: 2010-12-29
NANTONG HUAXIN CENT AIR CONDITIONER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0024] However, if the number of layers of different users is different, still taking two users in the LTE system as an example, since UE1 only uses 1 layer for transmission, and UE2 has 2 layers for transmission, if the LTE transmission rank index (TRI: transmission rank index) to notify, for UE1, then TRI=1, will not know the existence of other layers of pilots, resulting in the contradiction of data demapping

Method used

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  • Method and system for notifying layer mapping information under multi-user multiple input multiple output mode
  • Method and system for notifying layer mapping information under multi-user multiple input multiple output mode
  • Method and system for notifying layer mapping information under multi-user multiple input multiple output mode

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Embodiment 1

[0077] In this embodiment, multiple UEs adopt a non-orthogonal DMRS (DMRS sharing) mode.

[0078] In this embodiment, on the basis of the above data processing process, the eNodeB needs to limit that only UEs with the same number of layers can be paired for MU-MIMO, and each UE paired for MU-MIMO transmission uses the same DMRS, and the paired UEs for MU-MIMO For each UE in a group of UEs to be transmitted, the eNodeB only needs to notify the layer number information used on the resources allocated for the group of UEs.

[0079] In this mode, UE1 is taken as an example to describe the reception processing steps of the receiver.

[0080] Step A, UE1 first receives the control signaling indication information, and obtains the layer number information of the DMRS;

[0081] Step B, performing channel estimation on each layer respectively according to the layer number information of the DMRS;

[0082] The method at this time is similar to that in LTE. The pilot patterns of the DM...

Embodiment 2

[0093] In this embodiment, when multiple UEs adopt a non-orthogonal DMRS (DMRS sharing) mode, the number of UE layers paired in MU-MIMO may be different.

[0094] If the demodulation pilot is designed according to the FDM mode, the difference between this embodiment and the first embodiment is that, for each UE in a group of UEs that are paired for MU-MIMO transmission, the eNodeB only uses the control channel dedicated to the UE The unit sends the layer number information used by the UE, and punctures the data on the RE corresponding to the DMRS pilot position that is not used by the UE but used by other UEs in the same group, or punctures the data with the DMRS pilot at this position for multiplexing.

[0095] In the FDM pilot multiplexing mode, because the UE cannot recognize the existence of other layers, the current UE will treat the pilots on the layers that are not used by itself as its own data, and at this time the eNodeB will process the pilots on the layers that are...

Embodiment 3

[0099] In the MU-MIMO of this embodiment, different UEs use orthogonal DMRSs.

[0100] A notification method proposed in this embodiment is that, for each UE in a group of UEs paired for MU-MIMO transmission, the eNodeB notifies the total number of layers used by the group of UEs and the codeword stream index corresponding to the UE .

[0101] The total bit overhead can be expressed as: the total layer information occupation Where L represents the maximum number of layers supported by the system, and the codeword stream index occupies It is used to indicate the codeword stream corresponding to the UE. where S represents the maximum number of codeword streams supported by the system, Indicates that x is rounded up. When SU-MIMO and MU-MIMO use the same downlink control information (DCI) format, the codeword stream index and transmission mode information occupy

[0102] Assume that the maximum number of layers supported by the system is 8, and the maximum number of cod...

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Abstract

The invention discloses a method and a system for notifying layer mapping information under a multi-user multiple input multiple output (MU-MIMO) mode. The method comprises that: a transmitting party allocates orthogonal DMRS for a group of receiving parties which are paired to perform MU-MIMO transmission under an MU-MIMO transmission mode, wherein the port number of the used DMRS on resources which are allocated to the group of receiving parties is the sum of layers respectively used by each receiving party; or, the transmitting party shares the DMRS for the group of receiving parties which are paired to perform MU-MIMO transmission, and determines the port number of the DMRS according to the layer number of the receiving party with the most using layers; and for each receiving party in the group of receiving parties, the transmitting party notifies the mapping mode information from the code word stream to the layer of the receiving party to the receiving party. The method and the system for notifying layer mapping information under the MU-MIMO mode can solve the problem of data solution mapping problem because of UE does not know the presence of pilot frequency of other layers, and improve the user data detection performance.

Description

technical field [0001] The present invention relates to a method and system for notifying layer mapping information in a multi-user multiple input multiple output (MU-MIMO for short) mode in an LTE-A system. Background technique [0002] Currently, in LTE-A, in order to reduce the overhead of the pilot, the pilot is divided into two parts: the channel measurement pilot (CSI-RS: channel state information-reference signal) and the demodulation pilot (DMRS: demodulation reference signal). According to the current design Assume that the baseline of DMRS and CSI-RS (baseline, that is, as the basis for follow-up research) is: [0003] Two new classes of RS are defined: [0004] ● DMRS, used for PDSCH (physical downlink share channel) demodulated pilot frequency. [0005] • CSI-RS, used to acquire pilots of Channel State Information (CSI). [0006] The design constraints of DMRS are: [0007] DMRS is user-specific (ue-specific), and is only transmitted on the scheduled RB and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W68/00H04B1/707H04L1/06H04L1/16H04L25/03
Inventor 孙云锋姜静朱常青张峻峰张晨晨
Owner NANTONG HUAXIN CENT AIR CONDITIONER
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