Channel assignment method, radio communication system and channel structure in radio section

• US 8,112,090 B2
• Filed: 06/13/2006
• Issued: 02/07/2012
• Est. Priority Date: 06/14/2005
• Status: Expired due to Fees

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Tanno, Motohiro, Higuchi, Kenichi, Sawahashi, Mamoru
• Primary Examiner(s): Patel, Ajit
• Assistant Examiner(s): NGUYEN, KHAI MINH
• Application Number:
  US11/917,743
• Publication Number:
  US 20090215464A1
• Time in Patent Office: 2,065 Days
• Field of Search: 455/450, 455/452.1, 455/452.2, 455/453, 455/422.1, 370/329, 370/341, 370/431, 370/348
• US Class Current: 455/450
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access

Abstract

In a radio communication system, a user terminal transmits a reservation packet to a base station using a common control channel (1), and the base station assigns an uplink data channel to the user terminal according to the reservation packet, and assigns a first shared control channel (2b) to the user terminal in association with the uplink data channel, and the mobile station transmits a control signal to the base station using the associated uplink shared control channel. According to status of radio communication, the base station may assign beforehand a second uplink shared control channel (2a) for which occupation by the user terminal is permitted only while the user terminal is performing communication.

Claims

1. A channel assignment method, comprising:

a step of setting an uplink common control channel commonly used for all users belonging to a base station;

a step of assigning an uplink data channel to a user terminal according to a reservation packet transmitted from the user terminal using the uplink common control channel;

a step of assigning an uplink shared control channel to the user terminal in association with the uplink data channel; and

a step of assigning a second uplink shared control channel, according to the reservation packet, for which occupation by the user terminal is permitted.

2. The channel assignment method as claimed in claim 1, further comprising:

a step of assigning an uplink direct access channel to the user terminal.

3. The channel assignment method as claimed in claim 1, further comprising:

a step of assigning an uplink direct access channel to the user terminal.

4. A radio communication system, wherein:

a user terminal transmits a reservation packet to a base station;

according to the reservation packet, the base station assigns an uplink data channel to the user terminal, and assigns a first shared control channel to the user terminal in association with the uplink data channel, and

the mobile station transmits a control signal to the base station using the uplink shared control channel associated with the data channel; and

wherein, according to the reservation packet, the base station assigns a second uplink shared control channel for which occupation by the user terminal is permitted.

5. The radio communication system as claimed in claim 4, wherein the reservation packet is transmitted using an uplink common control channel commonly used for all user terminals belonging to the base station.

6. The radio communication system as claimed in claim 4, wherein the user terminal transmits a control signal for data generated at a time t1 to the base station using an uplink data channel assigned according to a reservation packet that is transmitted before the time t1.

7. The radio communication system as claimed in claim 4, wherein the mobile station transmits the control signal to the base station using an uplink data channel assigned according to the reservation packet.

8. The radio communication system as claimed in claim 4, wherein the mobile station transmits, using the first uplink shared control channel, at least one of a control signal for uplink data transmission, a control signal for retransmission control and a control signal for downlink retransmission control to the base station.

9. The radio communication system as claimed in claim 4, wherein the mobile station transmits, using the second uplink shared control channel, at least one of a control signal for uplink scheduling, a control signal for downlink scheduling and a feedback signal for downlink data transmission to the base station.