RADIO BASE STATION AND MOBILE COMMUNICATION METHOD

• US 20120063399A1
• Filed: 03/24/2010
• Published: 03/15/2012
• Est. Priority Date: 03/25/2009
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Kiyoshima, Kohei, Ishii, Hiroyuki, Okubo, Naoto
• Granted Patent: US 8,724,569 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 5/0017 in which a distinct code is applied, as a temporal sequence, to each frequency
• CPC Class Codes: H04L 5/0019 in which one code is applied, as a temporal sequence, to all frequencies
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority

Abstract

A radio base station includes a resource assignment unit for assigning a resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal to a first mobile station during a semi-persistent scheduling bearer setting process. The resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal is formed by a combination of a frequency direction resource and a code direction resource by which the first mobile station transmits a transmission acknowledgement signal after a predetermined timing from a timing of receiving downlink data, to the downlink data that has been scheduled by semi-persistent scheduling and has been transmitted via a downlink data channel. The resource assignment unit is configured to assign the resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal to the first mobile station based on a number of assignments of predetermined resources formed by a combination of a frequency direction resource and a code direction resource.

Claims

1. A radio base station comprising:

a resource assignment unit configured to assign a resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal to a first mobile station during a semi-persistent scheduling bearer setting process, wherein

the resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal is a resource candidate formed by a combination of a frequency direction resource and a code direction resource by which the first mobile station transmits a transmission acknowledgement signal after a predetermined timing from a timing of receiving downlink data, to the downlink data that has been scheduled by semi-persistent scheduling and has been transmitted via a downlink data channel, and

the resource assignment unit is configured to assign the resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal to the first mobile station based on a number of assignments of predetermined resources formed by a combination of a frequency direction resource and a code direction resource during a semi-persistent scheduling transmission acknowledgement signal transmission period of the first mobile station, and when the downlink data is scheduled by the semi-persistent scheduling, the resource assignment unit is configured to select a resource for transmitting a transmission acknowledgment signal for the downlink data from among the resource candidates for transmitting a semi-persistent scheduling transmission acknowledgement signal.

2. The radio base station according to claim 1, wherein the semi-persistent scheduling transmission acknowledgement signal transmission period is obtained by delaying a discontinuous reception period of the first mobile station by the predetermined timing.

3. The radio base station according to claim 1, wherein

the number of assignments of the predetermined resources is a total number of other mobile stations, to which the predetermined resource has been assigned as the resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal, at each sub-frame of the semi-persistent scheduling transmission acknowledgement signal transmission period of the first mobile station.

4. The radio base station according to claim 1, wherein

the resource assignment unit is configured to assign the resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signals to the first mobile station based on a resource assigned, as the resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal, to a second mobile station having a discontinuous reception period temporally and at least partially overlapping the discontinuous reception period of the first mobile station.

5. The radio base station according to claim 1, wherein

the number of assignments of the predetermined resources is a number of assignments of resources belonging to a predetermined resource group during the semi-persistent scheduling transmission acknowledgement signal transmission period of the first mobile station, and

the resource assignment unit is configured to assign the resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal in a resource group unit.

6. The radio base station according to claim 1, wherein

the predetermined resource group is a resource group including resources assigned, as the resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal, to a second mobile station having a discontinuous reception period temporally and at least partially overlapping the discontinuous reception period of the first mobile station.

8. The radio base station according to claim 2, wherein

the number of assignments of the predetermined resources is a total number of other mobile stations, to which the predetermined resource has been assigned as the resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal, at each sub-frame of the semi-persistent scheduling transmission acknowledgement signal transmission period of the first mobile station.

9. The radio base station according to claim 2, wherein

the resource assignment unit is configured to assign the resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signals to the first mobile station based on a resource assigned, as the resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal, to a second mobile station having a discontinuous reception period temporally and at least partially overlapping the discontinuous reception period of the first mobile station.

10. The radio base station according to claim 3, wherein

the resource assignment unit is configured to assign the resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signals to the first mobile station based on a resource assigned, as the resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal, to a second mobile station having a discontinuous reception period temporally and at least partially overlapping the discontinuous reception period of the first mobile station.

7. A mobile communication method, comprising:

a step A of assigning a resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal to a first mobile station during a semi-persistent scheduling bearer setting process, wherein

the resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signals is a resource candidate formed by a combination of a frequency direction resource and a code direction resource by which the first mobile station transmits a transmission acknowledgement signal after a predetermined timing from a timing of receiving downlink data, to the downlink data that has been scheduled by semi-persistent scheduling and has been transmitted via a downlink data channel,

in the step A, the resource candidate for transmitting a semi-persistent scheduling transmission acknowledgement signal is assigned to the first mobile station based on a number of assignments of predetermined resources formed by a combination of a frequency direction resource and a code direction resource during a semi-persistent scheduling transmission acknowledgement single transmission period of the first mobile station, and

the mobile communication method further includes a step B of, when the downlink data is scheduled by the semi-persistent scheduling, selecting a resource for transmitting a transmission acknowledgement signal for the downlink data from among the resource candidates for transmitting a semi-persistent scheduling transmission acknowledgement signal.