Communication processing method and base station

Patent metadata

Field	Value
Publication number	US-9544159-B2
Application number	US-201214006764-A
Country	US
Kind code	B2
Filing date	Mar 22, 2012
Priority date	Mar 24, 2011
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

A base station receives channel state information corresponding to each of spare coordinated groups from each of user devices. A first group includes a plurality of coordinated groups arranged in advance. The spare coordinated groups corresponding to each user device are such as selected from the first group and include at least a service sector of best channel quality obtained measurement by the user device. The base station specifies a user device group corresponding to each of coordinated groups contained in each of coordinated group patterns. The user device group corresponding to the coordinated group is formed of user devices having the coordinated group in their spare coordinated groups. The base station uses channel state information reported from the user devices of the user device group corresponding to the coordinated group as a basis to perform user scheduling on the coordinated group.

First claim

The invention claimed is:

1. A communication processing method used in a base station having a plurality of sectors, the communication processing method comprising:
the base station receiving channel state information corresponding to all or some of spare coordinated groups from each of user devices, a first group including a plurality of coordinated groups arranged in advance, each of the coordinated groups being formed of two or more sectors, and the spare coordinated groups corresponding to each of the user devices being selected from the first group and including at least a service sector of best channel quality obtained by measurement of the user device,
wherein the spare coordinated group for each user device includes all of the coordinated groups that contain the service sector of best channel quality;
the base station specifying a user device group corresponding to each of coordinated groups included in each of coordinated group patterns, the user device group corresponding to the coordinated group including user devices of which the corresponding spare coordinated groups include the coordinated group;
the base station performing user scheduling on each of the coordinated groups based on channel state information reported by the user devices of the user device group corresponding to the coordinated group; and
the base station specifying a user device and a coordinated group pattern to use in transmission based on scheduling results of the coordinated groups, and then performing data transmission based on the specified user device and the specified coordinated group pattern;
the base station obtaining an index of the service sector reported from each of the user devices; and
the base station selectin for the user device, the spare coordinated groups including the service sector from the coordinated groups arranged in advance and reporting the spare coordinated groups to the user device,
wherein when physical sector indexes of the sectors are different from each other, the index of the service sector is indicated by a physical sector index and when the physical sector indexes of the sectors are same as each other, the index of the service sector is indicated by an antenna index.

2. The communication processing method according to claim 1 , wherein the base station reports the spare coordinated groups to the user devices by higher layers.

3. The communication processing method according to claim 1 , wherein the base station receives the channel state information corresponding to all of the spare coordinated groups from each of the user devices and in the channel state information corresponding to all the spare coordinated groups reported by the user device, PMIs of channels corresponding to the respective spare coordinated groups are a PMT corresponding to a greatest CQI in the spare coordinated groups.

4. The communication processing method according to claim 1 , wherein the base station receives the channel state information corresponding to all of the spare coordinated groups from each of the user devices and in the channel state information corresponding to all the spare coordinated groups reported by the user device, PMIs of channels corresponding to the respective spare coordinated groups are same as each other, and the PMIs reported by the user device is, among all PMIs, such a PMI as to maximize a sum of CQIs corresponding to all the spare coordinated groups.

5. The communication processing method according to claim 1 , wherein the base station receives channel state information corresponding to a part of the spare coordinated groups from each of the user devices and a greatest CQI among CQIs of the part of the spare coordinated groups is equal to or greater than a greatest CQI among CQIs of other spare coordinated groups.

6. The communication processing method according to claim 5 , wherein in the channel state information corresponding to the part of the spare coordinated groups, PMIs of channels corresponding to the respective spare coordinated groups are a PMI corresponding to the greatest CQI in the spare coordinated groups.

7. The communication processing method according to claim 6 wherein in the channel state information corresponding to the part of the spare coordinated groups, the PMIs of the channels corresponding to the respective spare coordinated groups are same as each other and are such a PMI as to maximize a sum of the CQIs corresponding to the part of the spare coordinated groups.

8. The communication processing method according to claim 7 , wherein in the channel state information corresponding to the part of the spare coordinated groups, the CQIs corresponding to the respective spare coordinated groups are same as each other and are a maximum value, a minimum value or an average of CQIs corresponding to the PMIs given as feedback.

9. The communication processing method according to claim 1 , wherein the first group is determined by the following expression:

⋃

K
=
1

N

⁢

⋃

l
=
0

N
-
1

⁢

{

l
⁢

⁢
mod
⁢

⁢

⁢
N

,

(

l
+
1

)

⁢
mod
⁢

⁢
N

,
…
⁢

,

(

l
+
K
-
1

)

⁢
mod
⁢

⁢
N

}

where N is the number of sectors of a base station, K is the number of coordinated-group sectors, and K=1, . . . , N.

10. A base station having a plurality of sectors, comprising:
a receiving module configured to receive channel state information corresponding t

Assignees

• Nagata Satoshi
• Yun Xiang
• Chen Lan
• She Xiaoming
• Zhou Juejia
• Suda Hirohito
• Ntt Docomo Inc

Inventors

• Nagata Satoshi
• Yun Xiang
• Chen Lan
• She Xiaoming
• Zhou Juejia
• Suda Hirohito

Classifications

• H04W72/046 Primary

  the resource being in the space domain, e.g. beams · CPC title

• H04W16/28

  using beam steering · CPC title

• H04L5/0035

  Resource allocation in a cooperative multipoint environment · CPC title

• H04W72/12

  Wireless traffic scheduling · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title