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Multiuser multi-input multi-output system, base station, customer equipment and CQI feedback method

A user equipment, multi-input technology, applied in transmission systems, digital transmission systems, diversity/multi-antenna systems, etc., can solve problems such as non-compliance, high implementation complexity, and reduced system throughput performance

Inactive Publication Date: 2012-05-30
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, in the above scheme, because the CQI of Rank 2 obtained according to the correspondence between Rank 1 and Rank 2 is not the real CQI of Rank 2, this will cause the Rank 2 CQI value to be inaccurate in the Rank 2 transmission mode, and then The selected modulation and coding method is inaccurate, which eventually leads to a decrease in system throughput performance
[0013] Of course, if the UE feeds back the CQI of Rank 2 on each RB, obviously, it will also lead to a decrease in system throughput performance
[0014] If the UE feeds back the CQIs of Rank 1 and Rank 2 on each RB at the same time, the CQI values ​​used for scheduling and precoding are accurate, but the uplink signaling overhead is too large to meet the requirements of existing standards. At the same time, its implementation complexity is also very high

Method used

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  • Multiuser multi-input multi-output system, base station, customer equipment and CQI feedback method
  • Multiuser multi-input multi-output system, base station, customer equipment and CQI feedback method
  • Multiuser multi-input multi-output system, base station, customer equipment and CQI feedback method

Examples

Experimental program
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Effect test

no. 1 example

[0162] In the first embodiment of the present invention, it is described by taking all user equipments feeding back the CQI corresponding to the first Rank that was scheduled last time as an example.

[0163] Such as figure 1 As shown, the MIMO system of the first embodiment of the present invention includes a base station and user equipment communicating through a wireless network, wherein:

[0164] User equipment includes:

[0165] The first register is used to save the first Rank on which the RB of the user equipment was scheduled last time; here, the first Rank is one of Rank 1, Rank 2, ..., Rank n;

[0166] A calculation module, configured to calculate the CQI corresponding to the first Rank;

[0167] A first feedback module, configured to send the CQI corresponding to the first Rank to the base station;

[0168] Base stations include:

[0169] The second register, corresponding to the user equipment, is used to save the first Rank that the RB of the user equipment wa...

no. 2 example

[0193] In the first embodiment of the present invention, an example is described in which all user equipments feed back the CQI corresponding to the first Rank that was scheduled last time.

[0194] It can be seen from the first embodiment that user equipments feed back different CQIs. In the second embodiment of the present invention, user equipments feed back CQIs of the same Rank. The CQI of the same Rank can be Rank 1

[0195] One of CQI, Rank 2CQI, ..., Rank n CQI, but the CQI fed back by all user equipments is the CQI of the same Rank.

[0196] Such as image 3 As shown, the MIMO system according to the second embodiment of the present invention includes a base station and user equipment communicating through a wireless network, wherein:

[0197] User equipment includes:

[0198] The first register is used to save the first Rank on which the RB of the user equipment was scheduled last time; here, the first Rank is one of Rank 1, Rank 2, ..., Rank n;

[0199] A calcul...

no. 3 example

[0237] In the third embodiment of the present invention, it is described by taking all user equipments feeding back the CQI corresponding to the Rank in the upper layer signaling as an example.

[0238] Such as Figure 5 As shown, the MIMO system according to the third embodiment of the present invention includes a base station and user equipment communicating through a wireless network, wherein:

[0239] User equipment includes:

[0240] The third register is used to save the third Rank in the upper layer signaling; here, the third Rank is one of Rank1, Rank 2, ..., Rank n, and the third Rank of different user equipments may be the same , may also be different; the Rank saved in the third register is the third Rank in the latest upper layer signaling;

[0241] A calculation module, configured to calculate the CQI corresponding to the third Rank;

[0242] A third feedback module, configured to send the CQI corresponding to the third Rank to the base station;

[0243] Base ...

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Abstract

The invention provides a multi-user multi-input multi-output (MIMO) system, a base station (BS), user equipment (UE) and a CQI (channel quality indicator) feedback method, wherein, the multi-user MIMO system comprises the BS and the UE, and the BS and the UE are communicated through a wireless network; the UE is used for feeding back a CQI corresponding to a first Rank which is dispatched last time; and the BS is used for acquiring CQIs corresponding to all the Rank of the UE according to the CQI corresponding to the first Rank fed back by the UE, and carries out dispatching according to the CQIs corresponding to all the Rank of the UE. The invention has the advantages that the performance of system throughput is effectively improved; and the cost of uplink signaling is not increased.

Description

technical field [0001] The present invention relates to a mobile communication technology, in particular to a multi-user MIMO system and its base station, user equipment and CQI (Channel Quality Indicator, channel quality indicator) feedback method. Background technique [0002] In order to improve the throughput and spectrum utilization of an LTE (Long Term Evolution, Long Term Evolution) network, a multiple-input and multiple-output (MIMO) system uses multiple antennas at the transmitter and receiver sides. [0003] The most basic MIMO antenna configuration is 2×2, that is, there are two transmitting antennas on the base station (Node B) side, and two receiving antennas on the UE (User Equipment, user equipment) side, and there may also be four antenna configurations . [0004] In an existing multi-user multiple-input multiple-output (Multi-User Multi-Input Multi-Output, MU-MIMO) system, the data transmission mode is mainly a Rank (rank) 1 transmission mode or a Rank2 tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L1/00H04W88/02H04W88/08H04B7/04
CPCH04L5/0044H04W72/1231H04L5/006H04W72/1284H04W88/08H04L5/0023H04W88/02H04L1/0026H04W72/542H04W72/21
Inventor 朱剑驰佘小明刘竞秀陈岚田冈秀和
Owner NTT DOCOMO INC
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