DATA LINK TRANSMISSION CONTROL METHODS, MOBILE COMMUNICATION SYSTEMS, AND BASE STATIONS

• US 20070115914A1
• Filed: 01/22/2007
• Published: 05/24/2007
• Est. Priority Date: 04/26/2001
• Status: Abandoned Application

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Yoshino, Hitoshi, Otsu, Toru, Ohkubo, Shinzo, Yamao, Yasushi
• Application Number:
  US11/625,768
• Publication Number:
  US 20070115914A1
• Time in Patent Office: Days
• US Class Current: 370/349
• CPC Class Codes: H04L 1/1809 Selective-repeat protocols
• CPC Class Codes: H04L 2001/0092 Error control systems characterised by the topology of the transmission link
• CPC Class Codes: H04W 36/02 Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off

Abstract

A data link transmission control method of performing data link transmission control comprises automatic repeat request control for transmission/reception of a packet between a mobile station and a plurality of base stations indicated in FIG. 11, wherein a first base station stores and makes a copy of packet in which identification information specifying the packet has been added to packet addressed to the mobile station, wherein the first base station delivers the packet copy to a second base station, wherein the second base station stores the delivered packet copy, and wherein one or more base stations comprising the first base station transmit to the mobile station the packet accompanied by the identification information, or the delivered packet copy.

Claims

1. A data link transmission control method of performing data link transmission control comprising automatic repeat request control for transmission/reception of a packet between a mobile station and a plurality of base stations,

wherein a first base station stores and makes a copy of packet in which identification information specifying the packet has been added to packet addressed to said mobile station,

wherein said first base station delivers said packet copy to a second base station,

wherein said second base station stores said delivered packet copy, and

wherein one or more base stations comprising said first base station transmit to said mobile station the packet accompanied by said identification information, or said delivered packet copy.

3. The data link transmission control method according to claim 1, wherein said base stations perform:

deleting said packet on the basis of a timeout of a timer for said packet;

deleting said packet on the basis of a notification that a packet identical with said packet has arrived at said mobile station;

or,

on the basis of a notification of identification information for specifying a packet to be deleted, deleting the packet corresponding to said identification information.

4. The data link transmission control method according to claim 3, wherein when said first base station notifies said second base station of said identification information for specifying the packet to be deleted,

said first base station employs one or a combination of two or more methods selected from a first method of providing a notification of the identification information every time a packet is deleted, a second method of providing a notification of identification information of a packet deleted last in a predetermined time, and a third method of, upon deletion of a specific packet determined based on a predetermined rule, providing a notification of identification information of said packet.

5. The data link transmission control method according to claim 1, wherein when said first base station receives a request from said mobile station that a new base station should be designated as a packet-delivered base station, said first base station makes a copy of the packet accompanied by said identification information under storage at said first base station, and

delivers the packet copy to said new base station.

6. The data link transmission control method according to claim 1, wherein when said second base station receives a request from said mobile station that the second base station should be excluded from packet-delivered base stations, the second base station deletes the packet copy addressed to said mobile station under storage at the second base station.

7. The data link transmission control method according to claim 1, wherein when said first base station, said second base station, or both of said base stations receive and store a packet addressed to said mobile station, said base stations send a notification of storage of the packet to said mobile station,

wherein after reception of the notification, the mobile station selects one base station out of the base stations having provided the notification and issues a request for transmission of the packet to said base station, and

wherein the base station receiving the request transmits the packet.

8. The data link transmission control method according to claim 7, wherein when said first base station, said second base station, or both of said base stations receive the transmission request from the mobile station while storing a plurality of packets addressed to said mobile station, said base stations transmit the packets to the mobile station and notify the mobile station of storage of the plurality of packets addressed to the mobile station.

9. The data link transmission control method according to claim 1, wherein when said mobile station changes a base station desired to transmit a packet addressed to said mobile station itself,

said mobile station notifies an original base station before the change of discontinuation of subsequent transmission and sends to a new base station after the change, a request for transmission of a packet addressed to said mobile station itself and identification information of the first packet of a transmitted object.

10. The data link transmission control method according to claim 1, wherein said mobile station measures receiving qualities of signals transmitted from a plurality of base stations,

wherein said mobile station selects a first base station desired to transmit a packet addressed to said mobile station itself, based on the receiving qualities for the respective base stations, and

wherein said mobile station sends a request for transmission of the packet addressed to said mobile station itself, to the first base station thus selected.

11. The data link transmission control method according to claim 1, wherein said mobile station measures receiving qualities of signals transmitted from a plurality of base stations,

wherein said mobile station selects a first base station desired to transmit a packet addressed to said mobile station itself, based on the receiving qualities for the respective base stations,

wherein said mobile station notifies the first base station thus selected, of the receiving qualities for the respective base stations,

wherein, based on the receiving qualities for said respective base stations, said first base station determines for each of the other base stations whether a packet to be delivered from the first base station is to be transmitted to said mobile station, and

wherein said first base station provides instructions of transmission operation based on the result of the determination, to the other base stations.

12. The data link transmission control method according to claim 1, wherein when said mobile station receives identical packets from respective base stations, said mobile station performs diversity reception of the packets.

13. The data link transmission control method according to claim 1, wherein said mobile station measures receiving qualities of signals transmitted from a plurality of base stations, and

wherein, based on the receiving qualities for the respective base stations, said mobile station or each base station sends a request for a transition of a communication state to a base station desired to make the transition of the communication state into another communication state.

14. The data link transmission control method according to claim 13, wherein said communication states comprise:

a first state in which no packet transmission/reception is carried out to or from the mobile station;

a second state in which a packet addressed to said mobile station is provided with identification information for specifying said packet and in which the packet accompanied by the identification information can be transmitted to the mobile station;

a third state in which a packet addressed to said mobile station is provided with identification information for specifying said packet, a copy is made from the packet accompanied by the identification information, the packet copy is delivered, and the packet accompanied by the identification information can be transmitted; and

a fourth state in which the packet copy is received from a base station working in said third state and in which the packet copy can be transmitted to the mobile station.

15. The data link transmission control method according to claim 1, wherein said first base station encapsulates said identification information and the packets that are delivered, records the total value of the length of said identification information and the length of the delivered packet, which expresses the length of the encapsulated packet obtained by encapsulation, in the header of each encapsulated packet, and delivers these encapsulated packets, and, in cases where the length obtained by subtracting the length of the header of the encapsulated packet from the length of the encapsulated packet that is recorded in the header of the delivered encapsulated packet is not equal to the length of the delivered packet that is recorded in the header of the delivered packet, judges that the encapsulated packets are constructed containing identification information.

2. A data link transmission control method of performing data link transmission control comprising automatic repeat request control for transmission/reception of a packet between a mobile station and a plurality of base stations,

wherein a first base station adds to a packet addressed to said mobile station, identification information for specifying said packet,

wherein said first base station stores the packet accompanied by said identification information, and makes a copy of said packet,

wherein said first base station delivers said packet copy to a second base station,

wherein said second base station stores said delivered packet copy, and

wherein one or more base stations comprising said first base station transmit to said mobile station the packet accompanied by said identification information, or said delivered packet copy.

16. A mobile communication system comprising a mobile station and a plurality of base stations and configured to perform transmission/reception of information through a packet and perform data link transmission control comprising automatic repeat request control,

wherein each said base station comprises:

copying means for making a copy of packet in which identification information specifying the packet has been added to packet addressed to said mobile station;

delivering means for delivering the packet copy to another base station;

storing means for storing the packet accompanied by said identification information at said base station of its own or a packet delivered from another base station; and

transmitting means for transmitting the packet accompanied by said identification information or said delivered packet to said mobile station.

18. The mobile communication system according to claim 16, wherein said base station further comprises:

deleting means for deleting said packet stored by said storing means.

19. The mobile communication system according to claim 18, wherein said base station further comprises:

deleted packet notifying means for notifying another base station of the identification information of said packet to be deleted, by either one method or a combination of two or more methods selected from a first method of, every time the base station deletes a packet, providing a notification of the identification information of the deleted packet, a second method of providing a notification of identification information of a packet deleted last in a predetermined time, and a third method of, upon deletion of a specific packet determined based on a predetermined rule, providing a notification of identification information of said packet.

20. The mobile communication system according to claim 16, wherein said base station further comprises:

packet retransmitting means for, upon reception of a request for retransmission of a packet from said mobile station, retransmitting the packet in response to the request.

21. The mobile communication system according to claim 16, wherein said base station further comprises storage notifying means for, upon reception and storage of a packet addressed to said mobile station, sending a notification of the storage of the packet to the mobile station,

wherein said transmitting means transmits the packet to the mobile station in response to a request from the mobile station, and

wherein said mobile station further comprises:

selecting means for, upon reception of the notification, selecting one base station out of base stations sending the notification; and

transmission request means for sending a request for transmission of the packet to the base station selected.

22. The mobile communication system according to claim 21, wherein said base station further comprises:

notification control means performing such control that, when receiving a transmission request from the mobile station while storing a plurality of packets addressed to said mobile station, said notification control means makes said transmitting means transmit the packets to the mobile station and makes said storage notifying means send a notification of storage of the plurality of packets addressed to the mobile station, thereto.

23. The mobile communication system according to claim 16, wherein said mobile station further comprises:

change occasion notifying means for, when the mobile station changes a base station desired to transmit a packet addressed to said mobile station itself, to another base station, sending a notification of discontinuation of subsequent transmission to the original base station before the change and sending to the new base station after the change, a request for transmission of a packet addressed to said mobile station of its own and identification information of the first packet of a transmitted object.

24. The mobile communication system according to claim 16, wherein said mobile station further comprises:

measuring means for measuring receiving qualities of signals transmitted from a plurality of base stations;

selecting means for selecting a first base station desired to transmit a packet addressed to said mobile station of its own, based on the receiving qualities for the respective base stations; and

transmission request means for sending a request for transmission of a packet addressed to said mobile station of its own to the first base station selected.

25. The mobile communication system according to claim 16, wherein said mobile station further comprises:

measuring means for measuring receiving qualities of signals transmitted from a plurality of base stations;

selecting means for selecting a first base station desired to transmit a packet addressed to said mobile station of its own, based on the receiving qualities for the respective base stations; and

receiving quality notifying means for notifying the first base station selected of the receiving qualities for the respective base stations, and

wherein said base station further comprises;

determining means for, when the base station of its own is selected as said first base station, determining for each of other base stations whether a packet to be delivered from the base station of its own is to be transmitted to said mobile station, based on the receiving qualities for said respective base stations; and

instructing means for providing instructions of transmission operation based on the result of the determination, to the other base stations.

26. The mobile communication system according to claim 16, wherein said mobile station further comprises:

diversity reception means for, upon reception of identical packets from respective base stations, performing diversity reception of the packets.

27. The mobile communication system according to claim 16, wherein said mobile station further comprises:

measuring means for measuring receiving qualities of signals transmitted from a plurality of base stations;

decision means for making a decision about in which communication state each base station is out of a plurality of predetermined communication states, based on the receiving qualities for the respective base stations; and

state transition request means for sending a request for a transition of a communication state to a base station desired to make the transition of the communication state into another state, based on the result of the decision.

28. The mobile communication system according to claim 27, wherein said plurality of predetermined communication states comprise:

a first state in which no packet transmission/reception is carried out to or from the mobile station;

a second state in which a packet addressed to said mobile station is provided with identification information for specifying said packet and in which the packet accompanied by the identification information can be transmitted to the mobile station;

a third state in which a packet addressed to said mobile station is provided with identification information for specifying said packet, a copy is made from the packet accompanied by the identification information, the packet copy is delivered, and the packet accompanied by the identification information can be transmitted; and

a fourth state in which the packet copy is received from a base station working in said third state and in which the packet copy can be transmitted to the mobile station.

29. The mobile communication system according to claim 16, wherein said delivering means comprise encapsulating means for encapsulating said identification information and the packets that are delivered, encapsulated packet delivering means for recording the total value of the length of said identification information and the length of the packet that is delivered, which expresses the length of the encapsulated packet obtained by encapsulation, in the header of each encapsulated packet, and delivering these encapsulated packets, and construction judging means that judge that the encapsulated packets are constructed containing identification information in cases where the length obtained by subtracting the length of the header of the encapsulated packet from the length of the encapsulated packet that is recorded in the header of the delivered encapsulated packet is not equal to the length of the delivered packet that is recorded in the header of the delivered packet.

17. A mobile communication system comprising a mobile station and a plurality of base stations and configured to perform transmission/reception of information through a packet and perform data link transmission control comprising automatic repeat request control,

wherein each said base station comprises:

identification information adding means for adding to a packet addressed to said mobile station, identification information for specifying said packet;

copying means for making a copy of said packet accompanied by said identification information;

delivering means for delivering the packet copy to another base station;

storing means for storing the packet accompanied by said identification information at said base station of its own or a packet delivered from another base station; and

transmitting means for transmitting the packet accompanied by said identification information or said delivered packet to said mobile station.

30. A base station, together with a mobile station, making up a mobile communication system configured to perform transmission/reception of information through a packet and perform data link transmission control comprising automatic repeat request control, said mobile communication system comprising a plurality of base stations,

said base station comprising:

copying means for making a copy of packet in which identification information specifying the packet has been added to packet addressed to said mobile station;

delivering means for delivering the packet copy to another base station;

storing means for storing the packet accompanied by said identification information at the base station of its own and a packet delivered from another base station; and

transmitting means for transmitting the stored packets to said mobile station.

32. The base station according to claim 30, further comprising:

determining means for, when the mobile station configured to select a first base station desired to transmit a packet addressed to the mobile station, based on receiving qualities of signals transmitted from a plurality of base stations, and notify the first base station of the receiving qualities for the respective base stations, selects the base station of its own as said first base station, determining for each of other base stations whether a packet to be delivered from the base station of its own is to be transmitted to said mobile station, based on the receiving qualities for said respective base stations; and

instructing means for providing instructions of transmission operation based on the result of the determination, to the other base stations.

33. The base station according to claim 30, wherein said delivering means comprise encapsulating means for encapsulating said identification information and the packets that are delivered, encapsulated packet delivering means for recording the total value of the length of said identification information and the length of the packet that is delivered, which expresses the length of the encapsulated packet obtained by encapsulation, in the header of each encapsulated packet, and delivering these encapsulated packets, and construction judging means that judge that the encapsulated packets are constructed containing identification information in cases where the length obtained by subtracting the length of the header of the encapsulated packet from the length of the encapsulated packet that is recorded in the header of the delivered encapsulated packet is not equal to the length of the delivered packet that is recorded in the header of the delivered packet.

31. A base station, together with a mobile station, making up a mobile communication system configured to perform transmission/reception of information through a packet and perform data link transmission control comprising automatic repeat request control, said mobile communication system comprising a plurality of base stations,

said base station comprising:

identification information adding means for adding to a packet addressed to said mobile station, identification information for specifying said packet;

copying means for making a copy of the packet accompanied by said identification information;

delivering means for delivering the packet copy to another base station;

storing means for storing the packet accompanied by said identification information at the base station of its own and a packet delivered from another base station; and

transmitting means for transmitting the stored packets to said mobile station.