Communication terminal device and communication control method

• US 9,088,927 B2
• Filed: 06/05/2013
• Issued: 07/21/2015
• Est. Priority Date: 06/06/2012
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kodama, Takeshi
• Primary Examiner(s): ROSE, KERRI M
• Application Number:
  US13/910,918
• Publication Number:
  US 20130329587A1
• Time in Patent Office: 776 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 36/30 by measured or perceived connection quality data
• CPC Class Codes: H04W 60/04 using triggered events
• CPC Class Codes: H04W 68/00 User notification, e.g. alerting and paging, for incoming communication, change of service or the like

Abstract

A radio communication terminal including: a processor configured to communicate, when a reception quality of a radio signal of the base station is lower than a threshold value and when a first group identification information identifying a base station group to which the base station belongs is not received from the base station, to each of neighbor base stations sequentially in an intermittent reception period, to specify a specified neighbor base station of the neighbor base stations, the specified neighbor base station belonging to the base station group, based on whether a second group identification information is received from each of the neighbor base stations or not and based on the first group identification and the second group identification are same or not, to select the specified base station preferentially to which the terminal is to hand over, among the neighbor base stations.

Claims

1. A radio communication terminal comprising:

a memory; and

a processor coupled to the memory and configured

to be controlled by one of a plurality of base stations, each base station being divided into a plurality of base station groups, each base station group including at least one base station among the plurality of base stations,

to receive a first signal from a first base station among the plurality of base stations when the radio communication terminal is controlled by the first base station, the first signal indicating awake periods during which the radio communication terminal is awake for receiving from the first base station in an intermittent reception period that includes the awake periods and sleep periods during which the radio communication terminal sleeps,

to receive at least one second signal within the awake periods from at least one other base station other than the first base station among the plurality of base stations, each second signal being transmitted from each base station and identifying one of the plurality of base station groups that includes the base station,

to select a second base station being to control the radio communication terminal instead of the first base station based on the received at least one second signal, among the at least one other base station of which base station group is same as a base station group of the first base station, with higher priority than the at least one other base station of which base station group is different from a base station group of the first base station.

2. The communication terminal according to the claim 1, wherein the processor is further configured to perform, when an instruction for an action of the communication terminal is received from the at least one other base station, the action.

3. The communication terminal according to the claim 1, wherein the processor is further configured

to measure, before selecting a second base station, each of reception qualities from each of the at least one other base station;

to communicate to each of the at least one other base station sequentially in an order of descending each of the reception qualities in the intermittent reception period, and

to stop, when the second base station is selected, communicating to a rest of the at least one other base station.

4. The communication terminal according to the claim 1, wherein

the first base station sends a first group identification information to a second communication terminal in a second intermittent reception period, and

the processor is further configured

to identify the second intermittent reception period based on the intermittent reception period and a reception log, and

to communicate to each of the at least one other base station sequentially in the intermittent reception period or the second intermittent reception period.

5. The communication terminal according to the claim 1, wherein

the first base station sends a first group identification information to a second communication terminal in a second intermittent reception period, and

the processor is further configured

to identify the second intermittent reception period based on the intermittent reception period and a reception log, and

to measure, before selecting the second base station, each of reception qualities from each of the at least one other base station in the intermittent reception period or the second intermittent reception period.

6. The radio communication terminal according to claim 1, wherein

the processor is configured to start to receive the at least one second signal within the awake periods, when a reception quality of a radio signal of the first base station is lower than a threshold value and when the radio communication terminal receives broadcast information indicating each base station group of each of the at least one other base station from the first base station.

7. The radio communication terminal according to claim 1, wherein

the processor is configured, when the second signal is not received from a specified base station among the plurality of base stations other than the first base station, not to select the specified base station to be the second base station.

8. A radio communication terminal communication method comprising:

being controlled by one of a plurality of base stations, each base station being divided into a plurality of base station groups, each base station group including at least one base station among the plurality of base stations,

receiving a first signal from a first base station among the plurality of base stations when the radio communication terminal is controlled by the first base station, the first signal indicating awake periods during which the radio communication terminal is awake for receiving from the first base station in an intermittent reception period that includes the awake periods and sleep periods during which the radio communication terminal sleeps,

receiving at least one second signal within the awake periods from at least one other base station other than the first base station among the plurality of base stations, each second signal being transmitted from each base station and identifying one of the plurality of base station groups that includes the base station,

selecting a second base station being to control the radio communication terminal instead of the first base station based on the received at least one second signal, among the at least one other base station of which base station group is same as a base station group of the first base station, with higher priority than the at least one other base station of which base station group is different from a base station group of the first base station.

9. The communication method according to the claim 8, further comprising:

performing, when an instruction for an action of the communication terminal is received from the at least one other base station, the action.

10. The communication method according to the claim 8, further comprising:

measuring, before selecting a second base station, each of the reception qualities from each of the at least one other base station;

wherein the communicating communicates to each of the at least one other base station sequentially in an order of descending each of reception qualities in the intermittent reception period, and stops, when the second base station is selected, communicating to a rest of the at least one other base station.

11. The communication method according to the claim 8, wherein

the first base station sends a first group identification information to a second communication terminal in a second intermittent reception period, and

identifying the second intermittent reception period based on the intermittent reception period and a reception log, and

communicating to each of the at least one other base station sequentially in the intermittent reception period or the second intermittent reception period.

12. The communication method according to the claim 8, wherein

the first base station sends a first group identification information to a second communication terminal in a second intermittent reception period, and

identifying the second intermittent reception period based on the intermittent reception period and a reception log, and

the communication method further comprises:

measuring, before selecting the second base station, each of reception qualities from each of the at least one other base station in the intermittent reception period or the second intermittent reception period.

13. The communication method according to claim 8, wherein

receiving the at least one second signal within the awake periods, when a reception quality of a radio signal of the first base station is lower than a threshold value and when the radio communication terminal receives broadcast information indicating each base station group of each of the at least one other base station from the first base station.

14. The communication method according to claim 8, wherein

when the second signal is not received from a specified base station among the plurality of base stations other than the first base station, not to select the specified base station to be the second base station.