Base station, mobile station, communication system, and reordering method thereof
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01R-031/08
G06F-011/00
H04W-036/00
출원번호
US-0556876
(2009-09-10)
등록번호
US-8687496
(2014-04-01)
발명자
/ 주소
Ohta, Yoshiaki
출원인 / 주소
Fujitsu Limited
대리인 / 주소
Myers Wolin, LLC
인용정보
피인용 횟수 :
1인용 특허 :
3
초록▼
Disclosed is a reordering method for sending packets, to which numbers indicating sequence are attached, from a base station to a mobile station, and rearranging the packets in order of the sequence number in the mobile station. When a handover source base station transfers packets which have not be
Disclosed is a reordering method for sending packets, to which numbers indicating sequence are attached, from a base station to a mobile station, and rearranging the packets in order of the sequence number in the mobile station. When a handover source base station transfers packets which have not been sent to the mobile station, out of packets received from a host station, to a handover target base station, and the handover target base station sends the packets to the mobile station, data is sent from the handover source base station to the mobile station to notify that transference of the packets has been executed at the execution of handover sequence. The mobile station executed, reordering of the received packets when the transference of the packets has been executed.
대표청구항▼
1. A reordering method for sending packets, to which numbers indicating sequence are attached, from a base station to a mobile station, and rearranging the packets in order of the sequence number in the mobile station, the reordering method comprising: when a handover source base station transfers p
1. A reordering method for sending packets, to which numbers indicating sequence are attached, from a base station to a mobile station, and rearranging the packets in order of the sequence number in the mobile station, the reordering method comprising: when a handover source base station transfers packets which have not been sent to the mobile station, out of packets received from a host station, to a handover target base station, and the handover target base station sends the packets to the mobile station, sending data from the source base station to the mobile station to notify that transference of the packets from the source base station to the target station has been executed at the execution of handover sequence;sending data from the source base station to the mobile station to notify that transference of the packets is not executed at the execution of the handover sequence, when the packets are not transferred to the handover target base station; andat the mobile station judging whether transference of the packets is executed with reference to said data, and executing reordering of the packets received from the handover target base station when the transference of the packets has been executed whereinthe mobile station does not execute reordering of the received packets when the transference of the packets has not been executed. 2. The reordering method according to claim 1, further comprising: ending the reordering processing at the mobile station when packets having continuous sequence numbers are not received even if reordering processing of the received packets is executed for a predetermined time. 3. The reordering method according to claim 2, wherein the mobile station changes the length of the predetermined time to continue the reordering processing depending on the type of communication service. 4. The reordering method according to claim 1, wherein packets which are being transmitted when execution of handover sequence starts are packets for the transference. 5. The reordering method according to claim 1, further comprising: deciding by the handover source base station whether the packets, which have not been sent to the mobile station, are to be transferred to the handover target base station or to be erased, by referring to communication state information of the handover target base station that is received from the handover target base station at the execution of the handover sequence. 6. The reordering method according to claim 5, wherein the handover source base station refers to the communication state information, and transfers the packets, which have not been sent to the mobile station, to the handover target base station when the handover target base station is not in a congestion state, and erases the packets without transferring them to the handover target base station when the handover target base station is in a congestion state. 7. The reordering method according to claim 5, wherein the handover source base station refers to the communication state information, and transfers the packets, which have not been sent to the mobile station, to the handover target base station when a buffer of the handover target base station has sufficient space, and erases the packets without transferring them to the handover target base station when the buffer does not have sufficient space. 8. The reordering method according to claim 5, wherein the handover source base station refers to the communication state information, and transfers the packets, which have not been sent to the mobile station, to the handover target base station when the handover target base station has a function to receive packets from the handover source base station and send them to the mobile station, and erases the packets without transferring them to the handover target base station when the handover target base station does not have the function. 9. The reordering method according to claim 1, further comprising: deciding by the handover source base station whether the packets, which have not been sent to the mobile station, are to be transferred to the handover target base station or to be erased depending on the type of communication service. 10. The reordering method according to claim 9, wherein the handover source base station transfers the packets, which have not been sent to the mobile station, to the handover target base station if the type of communication service is non-real-time communication, and erases the packets without transferring them to the handover target base station if the type of communication service is real-time communication. 11. The reordering method according to claim 1, wherein the handover source base station transfers the packets, which have not been sent to the mobile station, to the handover target base station when the handover source base station has a function to transfer the packets to the handover target base station, and erases the packets without transferring them to the handover target base station when the handover source base station does not have the function. 12. The reordering method according to claim 1, further comprising: in a case where the base station attaches sequence numbers to the packets to indicate the sequence of the packets, transfers the sequence numbers to the handover target base station when the handover source base station transfers the packets, which have not been sent to the mobile station, to the handover target base station. 13. A communication system for sending packets, to which numbers indicating sequence are attached, from a base station to a mobile station, and rearranging the packets in order of the sequence number in the mobile station, comprising: a handover source base station, a handover target base station and a mobile station whereinthe handover source base station having: a buffer which stores packets received from a host station; a packet transmission unit which sends the packets stored in the buffer to the mobile station; and a control unit which sends data to notify that transference of the packets has been executed to the mobile station, when the handover source base station transfers the packets, which have not been sent to the mobile station, to the handover target base station at the execution of handover sequence, and sends data to notify that transference of the packets is not executed to the mobile station, when the packets are not transferred to the handover target base station;the handover target base station having: a buffer which stores packets received from the handover source base station and packets received from the host station at the execution of handover sequence; a control unit which controls such that the packets received from the handover source base station are sent to the mobile station preferentially; and a transmission unit which sends packets to the mobile station; andthe mobile station having: a buffer which stores packets received from the base station; and a control unit which executes reordering of the received packets or does not execute reordering of the received packets based on said data received from the handover source base station and indicating whether transference of the packets has been executed. 14. The communication system according to claim 13, wherein the control unit of the mobile station ends reordering processing when packets having continuous numbers are not received even if reordering processing of the received packets is executed for a predetermined time. 15. The communication system according to claim 13, wherein the control unit of the handover source base station decides whether the packets, which have not been sent to the mobile station, are to be transferred to the handover target base station or to be erased, by referring to communication state information of the handover target base station that is received from the handover target base station at the execution of the handover sequence. 16. The communication system according to claim 13, wherein the control unit of the handover source base station decides whether the packets, which have not been sent to the mobile station, are to be transferred to the handover target base station or to be erased depending on the type of communication service. 17. The communication system according to claim 13, wherein the control unit of the handover source base station transfers the packets, which have not been sent to the mobile station, to the handover target base station when the control unit has a function to transfer the packets to the handover target base station, and erases the packets without transferring them to the handover target base station when the control unit does not have the function. 18. The communication system according to claim 13, wherein in a case where the base station attaches sequence numbers to the packets to indicate the sequence of the packets, the control unit of the handover source base station transfers the sequence numbers to the handover target base station when the handover source base station transfers the packets, which have not been sent to mobile station, to the handover target base station. 19. A base station in a communication system for sending packets, to which numbers indicating sequence are attached, from a base station to a mobile station and rearranging the packets in order of the sequence number in the mobile station, comprising: a buffer which stores packets received from a host station and packets received from a handover source base station at the execution of handover sequence;a packet transmission unit which sends packets stored in the buffer to the mobile station;a handover control unit which decides whether packets, which have not been sent to the mobile station, are to be transferred to a handover target base station at the execution of handover sequence or not, transfers the packets to the handover target base station and data to notify that transference of the packets has been executed to the mobile station if the packets are to be transferred to the handover target base station, and sends the data to notify that transference of the packets is not executed to the mobile station if the packets are not to be transferred to the handover target base station; andtransmission control unit which sends the packets received by the handover source base station to the mobile station with priority over the packets received from the host station at the execution of handover sequence. 20. The base station according to claim 19, wherein the handover control unit decides whether the packets, which have not been sent to the mobile station, are to be transferred to the handover target base station or to be erased, by referring to communication state information of the handover target base station that is received from the handover target base station at the execution of the handover sequence. 21. The base station according to claim 19, wherein the handover control unit decides whether the packets, which have not been sent to the mobile station, are to be transferred to the handover target base station or to be erased depending on the type of communication service. 22. The base station according to claim 19, wherein the handover control unit transfers the packets, which have not been sent to the mobile station, to the handover target base station when the handover control unit has a function to transfer the packets to the handover target base station, and erases the packets without transferring them to the handover target base station when the handover control unit does not have the function. 23. The base station according to claim 19, wherein in a case where the base station attaches sequence numbers to the packets to indicate the sequence of the packets, the handover control unit of the handover source base station transfers the sequence numbers to the handover target base station when it transfers the packets, which have not been sent to the mobile station, to the handover target base station.
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이 특허에 인용된 특허 (3)
Mitts H.ang.kan,FIX ; Immonen Jukka,FIX ; Hansen Harri,FIX, Maintaining the composition of transferred data during handover.
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