Communication method in mobile communication system, and mobile station and base station in the same system

• US 20060292992A1
• Filed: 09/15/2005
• Published: 12/28/2006
• Est. Priority Date: 06/23/2005
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kawasaki, Yoshihiro, Tajima, Yoshiharu, Furukawa, Hideto, Obuchi, Kazuhisa, Kawabata, Kazuo
• Granted Patent: US 8,068,788 B2
• Time in Patent Office: Days
• US Class Current: 455/67.11
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

Abstract

The present method adds uplink data to a transmission request sent to the base station from the mobile station for obtaining permission for data transmission, or to a channel establishment request sent from the mobile station to the base station for establishing a channel in order to send the transmission request therethrough. This makes it possible to suppress delay caused by negotiation prior to actual uplink data transmission as much as possible, thereby realizing efficient uplink data transmission, that is, improved throughput of uplink communication.

Claims

1. A communication method in a mobile communication system including at least one mobile station and a base station, which performs radio communication with the mobile station, said communication method comprising:

on the mobile station,

adding uplink data to a transmission request sent to the base station for obtaining permission for data transmission, or to a channel establishment request sent to the base station for establishing a channel in order to send the transmission request therethrough.

2. A communication method as set forth in claim 1, further comprising:

on the base station,

adding transmission permission/non-permission notification information, indicating whether or not data transmission is permitted in response to the transmission request, to reply information sent to the mobile station, which reply information indicates whether or not the uplink data sent from the mobile station has been normally received.

3. A communication method in a mobile communication system including at least one mobile station and a base station, which performs radio communication with the mobile station, wherein said base station is operable in a first mode in which the base station'"'"'s permission is not necessary when the mobile station transmits uplink data, and a second mode in which the base station'"'"'s permission is necessary when the mobile station transmits uplink data, said method comprising:

on the base station,

monitoring an uplink communication state between the base station and the mobile station;

operating in the first mode if the uplink communication state is of a specific or higher level of quality; and

operating in the second mode if the uplink communication state is of quality lower than the specific level.

4. A communication method as set forth in claim 3, further comprising:

on the base station,

monitoring, while operating in the first mode, whether or not a collision occurs in uplink data transmission from two or more mobile stations; and

notifying each of the mobile station, if a collision occurs, of retransmission timing in the uplink data transmission.

5. A communication method as set forth in claim 4, further comprising:

on the base station,

informing the two or more mobile stations of a busy state during a specific period in which uplink data retransmission is expected based on the notification of the retransmission timing.

6. A communication method as set forth in claim 4, further comprising:

on the mobile station,

performing the uplink data transmission using uplink data having a fixed data length.

7. A communication method as set forth in claim 4, wherein the uplink data includes:

a user identification portion identifying each mobile station; and

a data portion which is a message body.

8. A communication method as set forth in claim 7, wherein the user identification portion is obtained by time-division multiplexing, or frequency-division multiplexing, or code-division multiplexing the user identification information of each of the two or more mobile stations.

9. A communication method as set forth in claim 7, further comprising:

on the mobile station,

encoding the data portion based on information of the user identification portion.

10. A communication method as set forth in claim 7, further comprising:

on the mobile station,

inserting information of the user identification portion into the data portion.

11. A communication method as set forth in claim 9, further comprising:

on the base station,

performing a decoding process from the user identification portion.

12. A communication method as set forth in claim 10, further comprising:

on the base station,

performing a decoding process from the data portion.

13. A communication method as set forth in claim 11, further comprising:

on the base station,

transmitting, if the user identification portion and the data portion are correctly decoded, permission for the following uplink data transmission, together with reply information indicating a normal reception, to a mobile station identified by information of the user identification portion; and

transmitting, if the user identification portion is correctly decoded but the data portion is not correctly decoded, permission for the following uplink data transmission, together with reply information indicating an abnormal reception, to a mobile station identified by information of the user identification portion.

14. A communication method as set forth in claim 12, further comprising:

on the base station,

transmitting, if the data portion is correctly decoded, permission for the following uplink data transmission, together with reply information indicating a normal reception, to a mobile station identified based on the decoded information; and

transmitting, if the user identification portion is correctly decoded but the data portion is not correctly decoded, permission for the following uplink data transmission, together with reply information indicating an abnormal reception, to a mobile station identified by information of the user identification portion.

15. A communication method as set forth in claim 13, further comprising:

on the mobile station,

transmitting, if the data transmission permission is received from the base station together with the reply information indicating a normal reception, the following uplink data to the base station in pursuance of the uplink data transmission permission; and

transmitting, if the data transmission permission is received from the base station together with the reply information indicating an abnormal reception, an uplink data retransmission request to the base station in pursuance of the uplink data transmission permission.

16. A communication method as set forth in claim 15, further comprising:

on the mobile station,

transmitting an uplink data retransmission request to the base station, if downlink data is not received from the base station within a specific period.

17. A mobile station for a mobile communication system including at least one mobile station and a base station, which performs radio communication with the mobile station, said mobile station comprising:

transmitter means which transmits a transmission request to the base station for obtaining permission for data transmission or a channel establishment request to the base station for establishing a channel in order to send the transmission request therethrough; and

data adding means which adds uplink data to the transmission request or to the channel establishment request.

18. A base station for a mobile communication system including at least one mobile station and a base station, which performs radio communication with the mobile station, said base station comprising:

reply information transmitter means which transmits reply information, indicating whether or not the uplink data sent from the mobile station has been normally received, to the mobile station; and

notification information adding means which adds transmission permission/non-permission notification information, indicating whether or not data transmission is permitted in response to the transmission request, to the reply information to be sent to the mobile station.

19. A base station for a mobile communication system including at least one mobile station and a base station, which performs radio communication with the mobile station, wherein said mobile station is operable in a first mode in which the base station'"'"'s permission is not necessary when the mobile station transmits uplink data, and a second mode in which the base station'"'"'s permission is necessary when the mobile station transmits uplink data, said base station comprising:

uplink communication state monitoring means which monitors an uplink communication state between the base station and the mobile station;

evaluating means which evaluates whether or not the communication state monitored by said communication state monitoring means is of a specific or higher level of quality; and

mode selecting means which selects the first mode as an operation mode if the evaluation result is positive, and which selects the second mode as an operation mode if the evaluation result is negative.

20. A base station for a mobile communication system as set forth in claim 19, further comprising:

data collision monitoring means which monitors, while operating in the first mode, whether or not a collision occurs in uplink data transmission from two or more mobile stations; and

retransmission timing notifying means which notifies each of the mobile stations, if an occurrence of a collision is detected by said data collision monitoring means, of retransmission timing in the uplink data transmission.

21. A base station for a mobile communication system as set forth in claim 20, further comprising:

busy state informing means which informs the two or more mobile stations of a busy state during a specific period in which uplink data retransmission is expected based on the notification of the retransmission timing made by said retransmission timing notifying means.

22. A base station for a mobile communication system as set forth in claim 20, further comprising:

receiver means which receives uplink data including;

a user identification portion identifying each mobile station; and

a data portion, which is a message body, said uplink data having been sent out from the mobile station after being encoded using information of the user identification portion; and

decoding means which decodes the uplink data, received by said receiver means, from the user identification portion.

23. A base station for a mobile communication system as set forth in claim 20, further comprising:

receiver means which receives uplink data including;

a user identification portion identifying each mobile station; and

a data portion, which is a message body, said uplink data having been sent out from the mobile station after information of the user identification portion is inserted in the data portion thereof; and

decoding means which decodes the uplink data, received by said receiver means, from the data portion.

24. A base station for a mobile communication system as set forth in claim 22, further comprising:

a reply and transmission permission transmitter means which transmits, if the user identification portion and the data portion are correctly decoded, permission for the following uplink data transmission, together with reply information indicating normal reception, to a mobile station identified by information of the user identification portion.

25. A base station for a mobile communication system asset forth in claim 24, wherein said reply and transmission permission transmitter means transmits, if the user identification portion is correctly decoded but the data portion is not correctly decoded, permission for the following uplink data transmission, together with reply information indicating abnormal reception, to a mobile station identified by information of the user identification portion.

26. A base station for a mobile communication system as set forth in claim 23, further comprising:

a reply and transmission permission transmitter means which transmits, if the data portion is correctly decoded, permission for the following uplink data transmission, together with reply information indicating a normal reception, to a mobile station identified based on the decoded information.

27. A base station for a mobile communication system as set forth in claim 26, wherein said reply and transmission permission transmitter means transmits, if the user identification portion is correctly decoded but the data portion is not correctly decoded, permission for the following uplink data transmission, together with reply information indicating an abnormal reception, to a mobile station identified by information of the user identification portion.

28. A mobile station for a mobile communication system including at least one mobile station and a base station, which performs radio communication with the mobile station, in which mobile communication system said base station notifies, if a collision occurs in uplink data transmission from two or more mobile stations, each of the mobile stations of retransmission timing in the uplink data transmission, said mobile station comprising:

uplink data generating means which generates uplink data including;

a user identification portion identifying each mobile station; and

a data portion, which is a message body; and

uplink data transmitter means which transmits the uplink data generated by said uplink data generating means to the base station.

29. A mobile station for a mobile communication system as set forth in claim 28, wherein said uplink data generating means generates the uplink data as data having a fixed data length.

30. A mobile station for a mobile communication system as set forth in claim 28, wherein said uplink data generating means includes encoding means which encodes the data portion based on information of the user identification portion.

31. A mobile station for a mobile communication system as set forth in claim 28, wherein said uplink data generating means includes inserting means which inserts information of the user identification portion into the data portion.

32. A mobile station for a mobile communication system as set forth in claim 28, said mobile station further comprising:

reply and transmission permission receiver means which receives permission for uplink data transmission together with reply information indicating normal or abnormal reception of the uplink data from the base station,

wherein said uplink transmitter means transmits, if said reply and transmission permission receiver means receives the data transmission permission together with the reply information indicating a normal reception, the following uplink data to the base station in pursuance of the uplink data transmission permission, and

wherein said uplink data transmitter means transmits, if said reply and transmission permission receiver means receives the data transmission permission together with the reply information indicating an abnormal reception, an uplink data retransmission request to the base station in pursuance of the uplink data transmission permission.

33. A mobile station for a mobile communication system as set forth in claim 32, wherein said uplink data transmitter means transmits an uplink data retransmission request to the base station, if downlink data is not received from the base station within a specific period.