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Channel rank estimation method, system and device during multi-stream beamforming transmission

A technology of beamforming and channel rank, applied in the field of rank estimation, can solve problems such as no rank value estimation scheme, inaccurate estimation, inapplicability of multi-stream beamforming transmission, etc.

Active Publication Date: 2014-04-30
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of the existing technology is that there is no solution for estimating the rank value during multi-stream beamforming transmission. In the prior art, the rank value is fed back by the terminal during single-stream beamforming transmission. For multi-stream beamforming transfer does not apply
And since there is no one-to-one correspondence between the public port pilot and the rank of the dedicated port, the UE's estimation of the rank value will be inaccurate during multi-stream beamforming transmission

Method used

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Embodiment 1

[0054] Such as image 3 As shown, it is a flow chart of the method for estimating the rank value of the channel during multi-stream beamforming transmission in Embodiment 1 of the present invention. In this embodiment, the base station estimates the rank value of the channel, including the following steps:

[0055] Step S301, the UE estimates the CQI of the downlink bandwidth according to the available common pilot. The number of available common pilot ports depends on the common pilot signal sent by the base station, and the UE detects the information of the PBCH (Physical Broadcast Channel, Physical Broadcast Channel) to obtain the number of actually sent ports. As an embodiment of the present invention, for the purpose of unified scheduling, the method of estimating the CQI of the UE according to the common pilot is notified to the UE by the high-level signaling of the base station, wherein the method of estimating the CQI can be based on the transmission diversity method o...

Embodiment 2

[0074] Such as Figure 5 As shown, it is a flow chart of the method for estimating the rank of the channel during multi-stream beamforming transmission in Embodiment 2 of the present invention. The difference between this embodiment and Embodiment 1 is that the UE obtains the rank value of the channel and feeds it back to the base station, including the following step:

[0075] In step S501, the UE estimates the SINR value of the channel according to the common pilot.

[0076] Step S502, the UE performs eigenvalue decomposition on the common pilot signal to obtain the channel eigenvalue λ i .

[0077] Step S503, the UE according to the SINR value and the characteristic value λ of the channel i Get the rank value of the channel. As an embodiment of the present invention, in this embodiment, the UE according to the SINR value and the characteristic value λ of the channel i The manner of obtaining the rank value of the channel is similar to that proposed in Embodiment 1, and...

Embodiment 3

[0087] Such as Figure 7 As shown, it is a flow chart of the method for estimating the rank value of the channel during multi-stream beamforming transmission in Embodiment 3 of the present invention. This embodiment is basically similar to Embodiment 2, except that the UE estimates the rank value of the channel in a different way. Include the following steps:

[0088] In step S701, the UE estimates the SINR value of each beamforming data stream according to each dedicated pilot signal, or estimates the SINR value of the channel according to the common pilot signal.

[0089] In step S702, the UE obtains the rank value of the channel according to the estimated SINR value of each beamforming data stream or the SINR value of the channel.

[0090]In step S703, the UE feeds back the acquired rank value of the channel to the base station.

[0091] Similarly, as a preferred embodiment, the present invention can also combine Embodiment 1 with this embodiment. The UE and the base stat...

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Abstract

An estimating method for a rank of a channel under multi-stream beam forming transmission includes that: an user equipment (UE) estimates a channel quality indicator (CQI) according to a common pilot; a base station receives the CQI fed by the UE; the base station estimates an uplink channel information according to an uplink detecting pilot signal, an uplink data demodulation reference signal or a demodulation reference signal of uplink control channel transmitted by the UE; the base station obtains the rank of the channel according to the CQI fed by the UE and the estimative uplink channel information. The invention can estimate the value of the rank effectively, thereby the self-adapting transmission of the rank can be supported and the flexibility of the system is improved.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method, system and device for estimating channel rank during multi-stream beamforming transmission. Background technique [0002] In the LTE (Long Term Evolution, long-term evolution) system, the common pilot is common to the cell, and there are currently 4 ports of the common pilot signal, such as figure 1 A and figure 1 As shown in B, they are schematic diagrams of common pilot mapping of a regular CP (Cyclic Prefix, cyclic prefix) and an extended CP in the LTE system in the prior art, which are sent on the full bandwidth. The dedicated pilot is based on UE (User Equipment, user equipment), that is, each user can only receive its own dedicated pilot signal. In the LTE system, the port number of the dedicated pilot is 5, such as figure 2 A and figure 2 Shown in B are the schematic diagrams of dedicated pilot mapping of conventional CP and extended CP in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/04H04L25/02
CPCH04B7/063H04L5/0048
Inventor 缪德山孙韶辉秦飞
Owner DATANG MOBILE COMM EQUIP CO LTD