Device and method for base stations dynamic clustering in mobile communication

Patent metadata

Field	Value
Publication number	US-8942757-B2
Application number	US-201013266898-A
Country	US
Kind code	B2
Filing date	Apr 29, 2010
Priority date	Apr 30, 2009
Publication date	Jan 27, 2015
Grant date	Jan 27, 2015

Abstract

Disclosed are a communication control device, a communication control method and the system thereof, which provide efficient multi-base station joint services in a mobile communication system using dynamic clustering. Optimal base station clustering is chosen according to the communication state between a terminal and each base station. The communication control device connects with multiple base stations through a network, and clusters the multiple base stations dynamically so that the clustered multiple base stations can provide services for the mobile terminal in union. The communication control device comprises: an interface, connecting with multiple base stations, receiving channel state information related to the mobile terminal from each base station; a memory unit, storing the channel state information of the mobile terminal received from the interface; a control unit, clustering each base station dynamically according to the channel state information of the mobile terminal stored in the memory unit.

First claim

The invention claimed is:

1. A communication control device, which is linked to a plurality of base stations via a network, performs dynamic clustering for said plurality of base stations to allow the plurality of clustered base stations to coordinate with each other to provide services to mobile terminals, said communication control device comprising:
an interface that is linked to the plurality of base stations to receive channel state information on mobile terminals from each of said base stations;
a memory that stores the channel state information on mobile terminals received from said interface; and
a control unit that performs dynamic clustering for each of said base stations based on the channel state information on mobile terminals stored in said memory,
wherein, when dynamic clustering is performed by said control unit:
channel state information between related mobile terminals and all base stations is retrieved from said memory for configuring a channel state information matrix;
an interference weight between each two of said base stations is calculated based on each element of the channel state information matrix for configuring a dynamic base station clustering diagram;
clustering parameters of all clustering possibilities are obtained based on a number of base stations in an arranged cluster of the base stations;
clustering having minimum clustering parameters is continuously performed until all of said base stations belong to a base station clustering and determining possibilities to make the clustering an efficient clustering; and
the clustering result is transmitted to all of said base stations.

2. The communication control device according to claim 1 , wherein
the channel state information is generated by each mobile terminal by receiving pilot information from each base station and carrying out calculation.

3. The communication control device according to claim 2 , wherein
said mobile terminal transmits the communication state information, which is transmitted to each base station, to a serving base station in a channel state information vector form.

4. The communication control device according to claim 2 , wherein
said base station has one or more physical antennas and said mobile terminal receives the pilot information via the one or more physical antennas of said base station.

5. The communication control device according to claim 1 , wherein
said memory stores a channel state information table that includes a mobile terminal number, channel state information between the mobile terminal and all of the mobile communication base stations, and service provision information between the mobile terminal and said all of the base stations and
said control unit determines optimal base station clustering of the mobile terminals based on the channel state information table on the mobile terminals stored in said memory.

6. The communication control device according to claim 5 , wherein
the channel state information stored in the channel state information table is original channel state information or simple channel state information, the simple channel state information generated by taking an absolute value of the original channel state information.

7. The communication control device according to claim 5 , wherein
when the channel state information is received from the base stations, said interface of the communication control device updates the channel state information table with the received information.

8. The communication control device according to claim 5 , further comprising:
a timer that determines a dynamic clustering operation period wherein
each time said timer times out, said control unit of the communication control device performs dynamic base station clustering scheduling.

9. The communication control device according to claim 1 , further comprising:
a signaling module that notifies a clustering result to all base stations after a communication connection with the base stations is established and said control unit completes the dynamic clustering for said each of said base stations.

10. The communication control device according to claim 9 , wherein
when said base station transmits the clustering result to said mobile terminal, said mobile terminal transmits a message to a corresponding serving base station to trigger a multi-BSs coordination service.

11. The communication control device according to claim 1 , wherein
a number of base stations of each base station clustering is set statically or dynamically.

12. A communication method for use in a communication system comprising a plurality of mobile terminals, a plurality of base stations each of which provides services to each mobile terminal, and a communication control device that has a memory in which a channel state information table is stored and performs control for the base stations, said communication method comprising the steps of:
receiving, by said communication control device, channel state information reported by all of the base stations for updating the channel state information table with the received information;
triggering, by said communication control device, dynamic base station clustering scheduling when the dynamic clustering operation timer times out;
retrieving channel state information generated between related mobile terminals and all base stations from said channel state information table for configuring a channel state information matrix;
calculating an interference weight between each two of said mobile communication base stations based on each element of the channel state information matrix for configuring a dynamic base station clustering diagram;
obtaining clustering parameters of all clustering possibilities based on a number of base stations in an arranged cluster of the base stations;
continuously performing clustering having minimum clustering parameters until all of said base stations belong to a base station clustering and determining possibilities to make the clustering an efficient clustering;
transmitting, by said communication control device, the clustering result to all of the base stations to allow the base stations to transfer the clustering result to the mobile terminals; and
providing services, by each base station, to said base station based on the clustering result.

13. A communication system comprising a plurality of mobile terminals, a plurality of base stations that provide services to each mobile terminal, and a communication control device that performs control for the base stations wherein
said mobile terminal periodically transmits communication state information with each base station to said each base station and
said communication control device comprises:
an interface that is linked to the plurality of base stations to receive channel state information on mobile terminals from each of said base stations;
a memory that stores the channel state information on mobile terminals received from said interface; and
a control unit that performs dynamic clustering for each of said base stations based on the channel state information on mobile terminals stored in said memory,
wherein, when dynamic clustering is performed by said control unit,
channel state information between related mobile terminals and all base stations is retrieved from said memory for configuring a channel state information matrix;
an interference weight between each two of said base stations is calculated based on each element of the channel state information matrix for configuring a dynamic base station clustering diagram;
clustering parameters of all clustering possibilities are obtained based on a numb

Assignees

• Jia Yunjian
• Fujishima Kenzaburo
• Yoshiuchi Hideya
• Yang Peng
• Ma Yuanchen
• Geng Lu
• Zhou Sheng
• Niu Zhisheng
• Gong Jie
• Hitachi Ltd

Inventors

• Jia Yunjian
• Fujishima Kenzaburo
• Yoshiuchi Hideya
• Yang Peng
• Ma Yuanchen
• Geng Lu
• Zhou Sheng
• Niu Zhisheng
• Gong Jie

Classifications

• H04W72/20

  Control channels or signalling for resource management · CPC title

• H04W72/27

  between access points · CPC title

• H04W92/20

  between access points · CPC title

• H04W72/0426

  Electricity · mapped topic

• H04B7/024

  Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems · CPC title