USRE50069EActiveUtility

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

56
Assignee: NEC CORPPriority: Feb 5, 2007Filed: Feb 1, 2008Granted: Jul 30, 2024
Est. expiryFeb 5, 2027(~0.6 yrs left)· nominal 20-yr term from priority
Inventors:Hisashi FutakiJinsock Lee
H04W 56/0045H04W 56/004H04W 56/0005H04W 88/08H04W 56/0055H04W 56/00
56
PatentIndex Score
0
Cited by
40
References
39
Claims

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 mth mobile station; causes the timer adaptive control part to obtain the traveling speed or the time variation in TA of the mth mobile station and, adaptively determines and outputs as the timer update information the length of the mth first timer within an M number in total of synchronization timers and the length of the second timer of the mth mobile station and update the length of the mth first timer; and transmits from the downlink transmission part a downlink signal which contains timer update information.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A base station of a wireless communication system which performs communication between a mobile station and the base station, the base station comprising:
 a timer unit which sets a period for judging whether an uplink signal from the mobile station is synchronized; and   a timer control unit which determines the set period for each of mobile stations and notifies the set period to each of the mobile stations.   
     
     
       2. The base station of  claim 1 , wherein the base station notifies said set period via a message which is related to a RRC connection. 
     
     
       3. A mobile station of a wireless communication system which performs communication between the mobile station and a base station, the mobile station comprising:
 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 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 the set period via a message which is related to a RRC connection. 
     
     
       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. 
   
     
     
       8. A method of a base station which communicates with one or more user equipment(s) (“UE(s)”) in a cell, the method comprising:
 transmitting a first timer value of a timer configured for uplink time alignment, wherein the first timer value is common to the one or more UE(s) in the cell; 
 transmitting a second timer value of the timer after transmitting the first timer value, wherein the second timer value is transmitted, by the base station, to one of the one or more UE(s) dedicatedly; 
 determining status of uplink synchronization by using the timer with the second timer value after the second timer value is transmitted; and 
 receiving one or more uplink signals from one of the one or more UE(s). 
 
     
     
       9. The method according to  claim 8 , wherein the first timer value is included in system information. 
     
     
       10. The method according to  claim 9 , wherein the first timer value is included in system information broadcast to the one or more UE(s). 
     
     
       11. The method according to  claim 8 , wherein the second timer value is included in a message which is related to an RRC connection. 
     
     
       12. The method according to  claim 8 , wherein the status of uplink synchronization is either an uplink signal is synchronized or the uplink signal is not synchronized. 
     
     
       13. The method according to  claim 12 , the method further comprising receiving, from the one of the one or more UE(s), the uplink signal. 
     
     
       14. The method according to  claim 8 , the method further comprising determining status of uplink synchronization by using the first timer value after the transmitting the first timer value and before the transmitting the second timer value. 
     
     
       15. A base station configured to communicate with one or more user equipment(s) (“UE(s)”) in a cell, the base station comprising:
 a transmitter; 
 a receiver; and 
 a processor, 
 wherein the processor is configured to transmit, via the transmitter, a first timer value of a timer configured for uplink time alignment, wherein the first timer value is common to the one or more UE(s) in the cell, 
 wherein the processor is configured to transmit, via the transmitter, a second timer value of the timer after transmitting the first timer value, wherein the second timer value is transmitted, by the base station, to one of the one or more UE(s) dedicatedly, 
 wherein the processor is configured to determine status of uplink synchronization by using the timer with the second timer value after the second timer value is transmitted, and 
 wherein the processor is configured to receive, via the receiver, one or more uplink signals from one of the one or more UE(s). 
 
     
     
       16. The base station according to  claim 15 , wherein the first timer value is included in system information. 
     
     
       17. The base station according to  claim 16 , wherein the first timer value is included in system information broadcast to the one or more UE(s). 
     
     
       18. The base station according to  claim 15 , wherein the second timer value is included in a message which is related to an RRC connection. 
     
     
       19. The base station according to  claim 15 , wherein the status of uplink synchronization is either an uplink signal is synchronized or the uplink signal is not synchronized. 
     
     
       20. The base station according to  claim 19 , the base station further comprising a receiver,
 wherein the processor is configured to receive, via the receiver, the uplink signal from the one of the one or more UE(s).   
     
     
       21. The base station according to  claim 15 , wherein the processor is configured to determine status of uplink synchronization by using the first timer value after transmitting the first timer value and before transmitting the second timer value. 
     
     
       22. A method of a user equipment (UE) among one or more user equipment(s) (“UE(s)”) in a cell managed by a base station, the method comprising:
 receiving a first timer value of a timer configured for uplink time alignment, wherein the first timer value is common to the one or more UE(s) in the cell; 
 receiving a second timer value of the timer after receiving the first timer value, wherein the second timer value is transmitted, by the base station, to the UE dedicatedly; 
 determining status of uplink synchronization by using the timer with the second timer value after receiving the second timer value; and 
 transmitting one or more uplink signals to the base station. 
 
     
     
       23. The method according to  claim 22 , wherein the first timer value is included in system information. 
     
     
       24. The method according to  claim 23 , wherein the first timer value is included in system information broadcast to the one or more UE(s). 
     
     
       25. The method according to  claim 22 , wherein the second timer value is included in a message which is related to an RRC connection. 
     
     
       26. The method according to  claim 22 , wherein the status of uplink synchronization is either an uplink signal is synchronized or the uplink signal is not synchronized. 
     
     
       27. The method according to  claim 26 , the method further comprising transmitting to a base station, the uplink signal. 
     
     
       28. The method according to  claim 22 , the method further comprising determining status of uplink synchronization by using the first timer value after the receiving the first timer value and before the receiving the second timer value. 
     
     
       29. A user equipment (UE) among one or more user equipment(s) (“UE(s)”) in a cell managed by a base station, the user equipment comprising:
 a receiver configured to:
 receive a first timer value of a timer configured for uplink time alignment, wherein the first timer value is common to the one or more UE(s) in the cell; 
 receive a second timer value of the timer after receiving the first timer value, wherein the second timer value is transmitted, by the base station, to the user equipment dedicatedly; 
 
 a processor configured to determine status of uplink synchronization by using the timer with the second timer value after the receiver receives the second timer value; and 
 a transmitter configured to transmit one or more uplink signals to the base station. 
 
     
     
       30. The user equipment according to  claim 29 , wherein the first timer value is included in system information. 
     
     
       31. The user equipment according to  claim 30 , wherein the first timer value is included in system information broadcast to the one or more UE(s). 
     
     
       32. The user equipment according to  claim 29 , wherein the second timer value is included in a message which is related to an RRC connection. 
     
     
       33. The user equipment according to  claim 29 , wherein the status of uplink synchronization is either an uplink signal is synchronized or the uplink signal is not synchronized. 
     
     
       34. The user equipment according to  claim 33 , the user equipment further comprising a transmitter configured to transmit, to a base station, the uplink signal. 
     
     
       35. The user equipment according to  claim 29 , wherein the processor is configured to determine status of uplink synchronization by using the first timer value after receiving the first timer value and before receiving the second timer value. 
     
     
       36. The method according to  claim 8 , wherein the timer with the second timer value is configured to indicate whether an uplink (“UL”) can be synchronized or not, and
 wherein the UL is considered synchronized when the timer with the second timer value is running and the UL is considered non-synchronized otherwise. 
 
     
     
       37. The base station according to  claim 15 , wherein the timer with the second timer value is configured to indicate whether an uplink (“UL”) can be synchronized or not, and
 wherein the UL is considered synchronized when the timer with the second timer value is running and the UL is considered non-synchronized otherwise. 
 
     
     
       38. The method according to  claim 22 , wherein the timer with the second timer value is configured to indicate whether an uplink (“UL”) can be synchronized or not, and
 wherein the UL is considered synchronized when the timer with the second timer value is running and the UL is considered non-synchronized otherwise. 
 
     
     
       39. The method according to  claim 29 , wherein the timer with the second timer value is configured to indicate whether an uplink (“UL”) can be synchronized or not, and
 wherein the UL is considered synchronized when the timer with the second timer value is running and the UL is considered non-synchronized otherwise.

Cited by (0)

No later patents cite this yet.

References (0)

No backward citations on record.