Wireless communication system, its base station and mobile station, communication synchronization management method and timer control program therefor

• US RE47,721 E1
• Filed: 07/28/2014
• Issued: 11/05/2019
• Est. Priority Date: 02/05/2007
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Futaki, Hisashi, Lee, Jinsock
• Primary Examiner(s): Wood, William H.
• Application Number:
  US14/444,321
• Time in Patent Office: 1,926 Days
• Field of Search: 370350, 455517
• CPC Class Codes: N/A

Abstract

A wireless communication system is provided for reducing the probability that latency before data transmission increases when a mobile station that is actually in sync is judged to be out of sync. A base station causes the timing calculation part to calculate the timing advance (TA) of a transmit timing from the m^th mobile station; causes the timer adaptive control part to obtain the traveling speed or the time variation in TA of the m^th mobile station and, adaptively determines and outputs as the timer update information the length of the m^th first timer within an M number in total of synchronization timers and the length of the second timer of the m^th mobile station and update the length of the m^th first timer; and transmits from the downlink transmission part a downlink signal which contains timer update information.

Claims

1. A base station of a wireless communication system which performs communication between with a plurality of mobile station and the base station stations, the base station comprising:

a timer unit which sets a period processor configured to determine a value of a timer for judging whether an a status of uplink signal from synchronization by a timing advance between the base station and one of the mobile station is synchronized stations; and

a timer control unit which determines the set period for each of mobile stations and notifies the set period transmitter configured to transmit, to the one of the mobile stations, the timing advance to control the uplink synchronization, and to transmit, to the one of the mobile stations, the value of the timer,

wherein the transmitter is configured to each transmit, to the one of the mobile stations, a cell specific timer value as the value of the timer before the transmitter transmits a mobile station specific timer value, and

wherein the transmitter is configured to transmit, to the one of the mobile stations, the mobile station specific timer value as the value of the timer after the transmitter transmits the cell specific timer value.

2. The base station of claim 1, wherein the base station notifies said set period transmitter is configured to transmit the cell specific timer value via system information and to transmit the mobile station specific timer value via a message which is related to a RRC connection.

8. The base station of claim 1, wherein the value of the timer is managed using the base station and the one of the mobile stations.

9. The base station of claim 1, wherein the processor is further configured to notify a restart of the value of the timer in the one of the mobile stations by transmitting a new timing advance to the one of the mobile stations using the transmitter.

10. The base station of claim 8, wherein the processor is further configured to notify a restart of the value of the timer in the one of the mobile stations by transmitting a new timing advance to the one of the mobile stations using the transmitter.

3. A mobile station of a wireless communication system which performs communication between the mobile station and with a base station, the mobile station comprising:

a receiver configured to receive a timing advance to control uplink synchronization and to receive a mobile station specific timer value of a timer, the timer being for judging a status of the uplink synchronization for one or more uplink signals by the timing advance;

a processor configured to execute the unit timer; and

a transmitter configured to transmit, to the base station, the one or more uplink signals,

wherein the receiver is further configured to receive a cell specific timer value of the timer before the receiver receives the mobile station specific timer value of the timer,

wherein the processor is configured to execute the timer using the cell specific timer value of the timer before the receiver receives the mobile station specific timer value of the timer, and

wherein the processor is configured to execute the timer using the mobile station specific timer value of the timer after the receiver receives the mobile station specific timer value of the timer which judges whether an uplink signal to the base station is synchronized based on a set period which is determined for each of a plurality of mobile stations and notified to each of the mobile stations.

4. The mobile station of claim 3, wherein the mobile station received receiver is configured to receive the set period cell specific timer value of the timer via system information and to receive the mobile station specific timer value of the timer via a message which is related to a RRC connection.

11. The mobile station of claim 3, wherein the processor is further configured to restart the timer whenever a new timing advance is provided by the base station.

5. A method executed by at least one processor of controlling a base station of a wireless communication system which performs communication between a plurality of mobile stations and the base station, the method comprising:

setting a period for judging whether an uplink signal from one of the mobile stations is synchronized; and

determining the set period for each of the mobile stations and notifies the set period to each of the mobile stations.

6. A method executed by at least one processor of controlling a mobile station of a wireless communication system which performs communication between the mobile station and a base station, the method comprising:

judging whether an uplink signal to the base station is synchronized based on a set period which is determined for each of a plurality of mobile stations and notified to each of the mobile stations.

7. A wireless communication system which performs communication between a mobile station and a base station, wherein the base station comprises:

a timer unit which sets a period for judging whether an uplink signal from the mobile station is synchronized;

a timer control unit which determines the set period for each of a plurality of mobile stations and notifies the set period to each of the mobile stations; and

wherein the mobile station comprises;

a unit which judges whether an uplink signal to the base station is synchronized based on a set period which is determined for each of the mobile stations and notified to each of the mobile stations.

12. A method executed by a base station which performs communication with a plurality of mobile stations, the method comprising:

determining a value of a timer for judging a status of uplink synchronization by a timing advance between the base station and one of the mobile stations;

transmitting, to the one of the mobile stations, the timing advance to control the uplink synchronization;

transmitting, to the one of the mobile stations, the value of the timer;

transmitting to the one of the mobile stations a cell specific timer value as the value of the timer before transmitting a mobile station specific timer value; and

transmitting, to the one of the mobile stations, the mobile station specific timer value as the value of the timer after transmitting the cell specific timer value.

13. The method of claim 12, wherein the value of the timer is managed using the base station and the one of the mobile stations.

14. The method of claim 12, wherein the method further comprises:

notifying a restart of the value of the timer in the one of the mobile stations by transmitting a new timing advance to the one of the mobile stations.

15. The method of claim 13, wherein the method further comprises:

notifying a restart of the value of the timer in the one of the mobile stations by transmitting a new timing advance to the one of the mobile stations.

16. The method of claim 12, wherein the method further comprises:

transmitting the cell specific timer value via system information; and

transmitting the mobile station specific timer value via a message which is related to a RRC connection.

17. A method executed by a mobile station which performs communication a base station, the method comprising:

receiving a timing advance to control uplink synchronization;

receiving a mobile station specific timer value of a timer, the timer being for judging a status of the uplink synchronization for one or more uplink signals by the timing advance;

transmitting, to the base station, the one or more uplink signals;

receiving a cell specific timer value of the timer before receiving the mobile station specific timer value of the timer;

executing the timer using the cell specific timer value of the timer before receiving the mobile station specific timer value of the timer; and

executing the timer using the mobile station specific timer value of the timer after receiving the mobile station specific timer value of the timer.

18. The method of claim 17, wherein the method further comprises:

restarting the value of the timer whenever a new timing advance is provided by the base station.

19. The method of claim 17, wherein the method further comprises:

receiving the cell specific timer value of the timer via system information; and

receiving the mobile station specific timer value of the timer via a message which is related to a RRC connection.

20. A non-transitory computer-readable recording medium having embodied thereon a computer program, which when executed by a computer, causes the computer to execute a process of a base station which performs communication with a plurality of mobile stations, said process comprising:

determining a value of a timer for judging a status of uplink synchronization by a timing advance between the base station and one of the mobile stations;

transmitting, to the one of the mobile stations, the timing advance to control the uplink synchronization; and

transmitting, to the one of the mobile stations, the value of the timer,

transmitting to the one of the mobile stations a cell specific timer value as the value of the timer before transmitting a mobile station specific timer value; and

transmitting, to the one of the mobile stations, the mobile station specific timer value as the value of the timer after transmitting the cell specific timer value.

21. A non-transitory computer-readable recording medium having embodied thereon a computer program, which when executed by a computer, causes the computer to execute a process of a mobile station which performs communication with a base station, said process comprising:

receiving a timing advance to control uplink synchronization;

receiving a mobile station specific timer value of a timer, the timer being for judging a status of the uplink synchronization for one or more uplink signals by the timing advance;

transmitting, to the base station, the one or more uplink signals;

receiving a cell specific timer value of the timer before receiving the mobile station specific timer value of the timer;

executing the timer using the cell specific timer value of the timer before receiving the mobile station specific timer value of the timer; and

executing the timer using the mobile station specific timer value of the timer after receiving the mobile station specific timer value of the timer.