Wireless communication method for reporting mu-cqi offset, user equipment and enode b

Patent metadata

Field	Value
Publication number	US-2016156402-A1
Application number	US-201314905257-A
Country	US
Kind code	A1
Filing date	Jul 29, 2013
Priority date	Jul 29, 2013
Publication date	Jun 2, 2016
Grant date	—

Abstract

Provided are a wireless communication method based on multiple-user multi-input multi-output (MU-MIMO) and a corresponding user equipment and eNode B. According to the present disclosure, a first MU-CQI offset corresponding to a first co-scheduled PMI which is fully orthogonal with a desired PMI is reported with a larger number of bits than a second MU-CQI offset corresponding to a second co-scheduled PMI which is not fully orthogonal with the desired PMI. Alternatively, a first MU-CQI off-set corresponding to a first co-scheduled PMI is reported with a first number of bits, and a second MU-CQI offset corresponding to a second co-scheduled PMI which is correlated with the first co-scheduled PMI is reported with a second smaller number of bits or even not reported. Alternatively, MU-CQI offset(s) corresponding to part of a plurality of co-scheduled PMIs configured by RRC is/are reported with a series of bits, wherein a first section of the series of bits indicates at least part of the co-scheduled PMI(s) for which the MU-CQI offset is reported, and a second section of the series of bits indicates the reported MU-CQI offset(s).

First claim

1 - 18 . (canceled)

19 . A user equipment (UE) supporting multiple-user multi-input multi-output (MU-MIMO), comprising:
a reporting unit configured to report multiple-user channel quality indicator (MU-CQI) offsets corresponding to co-scheduled precoding matrix indicators (PMI) to an eNode B, wherein a first MU-CQI offset corresponding to a first co-scheduled PMI being reported with a first number of bits, a second MU-CQI offset corresponding to a second co-scheduled PMI which is correlated with the first co-scheduled PMI being reported with a second number of bits or not reported, and the second number being smaller than the first number.

20 . The user equipment according to claim 19 , wherein
the first number is 2, and the second number is 1.

21 . A user equipment (UE) supporting multiple-user multi-input multi-output (MU-MIMO), comprising:
a reporting unit configured to report multiple-user channel quality indicator (MU-CQI) offset(s) corresponding to part of a plurality of co-scheduled precoding matrix indicators (PMI) configured by radio resource control (RRC) to an eNode B with a series of bits, wherein a first section of the series of bits indicating at least part of the co-scheduled PMI(s) for which the MU-CQI offset is reported, and a second section of the series of bits indicating the reported MU-CQI offset(s).

22 . The user equipment according to claim 21 , wherein the best MU-CQI offset among the MU-CQI offsets corresponding to the plurality of co-scheduled PMIs configured by RRC and the indication of its corresponding co-scheduled PMI are reported with the series of bits.

23 . The user equipment according to claim 22 , wherein the worst MU-CQI offset among the MU-CQI offsets corresponding to the plurality of co-scheduled PMIs configured by RRC and the indication of its corresponding co-scheduled PMI are also reported with the series of bits.

24 . The user equipment according to claim 22 , wherein a MU-CQI offset corresponding to a randomly selected co-scheduled PMI is also reported with the series of bits.

25 . The user equipment according to claim 22 , wherein a MU-CQI offset corresponding to a cyclically selected co-scheduled PMI other than the co-scheduled PMI corresponding to the best MU-CQI offset is also reported with the series of bits.

26 . The user equipment according to claim 25 , wherein the cyclically selected co-scheduled PMI is cyclically selected for subbands.

27 . The user equipment according to claim 22 , wherein only the best MU-CQI offset and the indication of its corresponding co-scheduled PMI are reported if the best MU-CQI offset is not larger than the worst offset level defined in a MU-CQI offset table used for the reporting.

28 - 37 . (canceled)

38 . An eNode B supporting multiple-user multi-input multi-output (MU-MIMO), comprising:
a receiving unit configured to receive multiple-user channel quality indicator (MU-CQI) offsets corresponding to co-scheduled precoding matrix indicators (PMI) reported from a user equipment (UE), wherein a first MU-CQI offset corresponding to a first co-scheduled PMI being reported with a first number of bits, a second MU-CQI offset corresponding to a second co-scheduled PMI which is correlated with the first co-scheduled PMI being reported with a second number of bits or not reported, and the second number being smaller than the first number.

39 . An eNode B supporting multiple-user multi-input multi-output (MU-MIMO), comprising:
a receiving unit configured to receive multiple-user channel quality indicator (MU-CQI) offset(s) corresponding to part of a plurality of co-scheduled precoding matrix indicators (PMI) configured by radio resource control (RRC) reported from a user equipment (UE) with a series of bits, wherein a first section of the series of bits indicating at least part of the co-scheduled PMI(s) for which the MU-CQI offset is reported, and a second section of the series of bits indicating the reported MU-CQI offset(s).

40 . The eNode B according to claim 39 , wherein the best MU-CQI offset among the MU-CQI offsets corresponding to the co-scheduled PMIs configured by RRC and the indication of its corresponding co-scheduled PMI are reported with the series of bits.

41 . The eNode B according to claim 40 , wherein the worst MU-CQI offset among the MU-CQI offsets corresponding to the co-scheduled PMIs configured by RRC and the indication of its corresponding co-scheduled PMI are also reported with the series of bits.

42 . The eNode B according to claim 40 , wherein a MU-CQI offset corresponding to a randomly selected co-scheduled PMI is also reported with the series of bits.

43 . The eNode B according to claim 40 , wherein a MU-CQI offset corresponding to a cyclically selected co-scheduled PMI other than the co-scheduled PMI corresponding to the best MU-CQI offset is also reported with the series of bits.

44 . The eNode B according to claim 43 , wherein the cyclically selected co-scheduled PMI is cyclically selected for subbands.

45 . The eNode B according to claim 40 , wherein only the best MU-CQI offset and the indication of its corresponding co-scheduled PMI are reported if the best MU-CQI offset is not larger than the worst offset level defined in a MU-CQI offset table used for the reporting.

Assignees

• Panasonic Ip Corp America

Inventors

• Hoshino Masayuki
• Wang Lilei

Classifications

• H04B7/0632 Primary

  Channel quality parameters, e.g. channel quality indicator [CQI] · CPC title

• H04W76/27

  Transitions between radio resource control [RRC] states · CPC title

• H04B7/0639

  Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection · CPC title

• H04W28/06

  Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} · CPC title

• H04B7/0452

  Multi-user MIMO systems · CPC title