COMMUNICATION CONTROL METHOD AND USER TERMINAL

• US 20170164396A1
• Filed: 03/18/2015
• Published: 06/08/2017
• Est. Priority Date: 03/20/2014
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: MORITA, Kugo, MATSUMOTO, Naohisa, ADACHI, Hiroyuki
• Granted Patent: US 10,314,068 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1896 ARQ related signaling
• CPC Class Codes: H04L 5/0044 allocation of payload
• 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 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04L 5/0096 Indication of changes in allocation
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 92/18 between terminal devices

Abstract

In the communication control method according to the present embodiment, a user terminal transmits a scheduling assignment indicating the location of a radio resource used in a reception of communication data by direct device-to-device communication. The user terminal transmits the communication data including initial transmission data and retransmission data by using the radio resource. The retransmission data is transmitted depending on the number of times of re-transmissions associated with a predetermined scheduling assignment by using a predetermined radio resource of which the location is indicated by the predetermined scheduling assignment.

Claims

1. A communication control method, comprising:

transmitting, by a user terminal, a scheduling assignment indicating a location of a radio resource used in a reception of communication data by direct device-to-device communication; and

transmitting, by the user terminal, the communication data including initial transmission data and retransmission data by using the radio resource, wherein

the retransmission data is transmitted depending on a number of times of re-transmissions associated with a predetermined scheduling assignment by using a predetermined radio resource of which a location is indicated by the predetermined scheduling assignment.

2. The communication control method according to claim 1, further comprising:

transmitting, by the user terminal, the predetermined scheduling assignment including re-transmissions-number-of-times information indicating the number of times of re-transmissions, when transmitting a plurality of initial transmission data by using the predetermined radio resource.

3. The communication control method according to claim 1, further comprising:

receiving, by the user terminal, the communication data including initial transmission data and retransmission data from another user terminal; and

deciding, by the user terminal, the number of times of re-transmissions on the basis of a reception status of the communication data received from the another user terminal.

4. The communication control method according to claim 3, wherein

when a reception success rate of the communication data indicating the reception status of the communication data received from the another user terminal is below a threshold value, the user terminal decides a value larger than a number of times of re-transmissions of retransmission data that is transmitted from the another user terminal as the number of times of re-transmissions.

5. The communication control method according to claim 3, wherein

when a reception success rate of the communication data indicating the reception status of the communication data received from the another user terminal is higher than a threshold value, the user terminal decides a value lower than a number of times of re-transmissions of retransmission data that is transmitted from the another user terminal as the number of times of re-transmissions.

6. The communication control method according to claim 3, further comprising:

deciding, by the user terminal, a modulation and coding scheme to be applied to the communication data transmitted by the user terminal after deciding the number of times of re-transmissions.

7. A communication control method, comprising:

transmitting, by a user terminal, a scheduling assignment indicating a location of a radio resource used in a reception of communication data by direct device-to-device communication;

transmitting, by the user terminal, the communication data including initial transmission data and retransmission data by using the radio resource; and

transmitting, by the user terminal, upon transmitting the communication data, a new data identifier indicating switching from a predetermined retransmission data to a next initial transmission data together with the initial transmission data or the retransmission data by using each of a plurality of small resources included in the radio resource.

8. The communication control method according to claim 7, wherein

the user terminal transmits, as the scheduling assignment, a first scheduling assignment and a second scheduling assignment that is transmitted after the first scheduling assignment, and

the user terminal transmits the communication data including the initial transmission data and the retransmission data by using at least a last small resource of a first plurality of small resources of which a location is indicated by the first scheduling assignment, and at least an initial small resource of a second plurality of small resources of which a location is indicated by the second scheduling assignment.

9. The communication control method according to claim 7, further comprising:

receiving, by the user terminal, communication data by direct device-to-device communication that includes initial transmission data and retransmission data from another user terminal; and

deciding, by the user terminal, a number of times of re-transmissions of the retransmission data on the basis of a reception status of the communication data received from the another user terminal.

10. The communication control method according to claim 9, wherein

when a reception success rate of the communication data indicating the reception status of the communication data received from the another user terminal is below a threshold value, the user terminal decides a value larger than a number of times of re-transmissions of retransmission data from the another user terminal as the number of times of re-transmissions of the retransmission data transmitted by the user terminal.

11. The communication control method according to claim 9, wherein

when a reception success rate of the communication data indicating the reception status of the communication data received from the another user terminal is higher than a threshold value, the user terminal decides a value lower than a number of times of re-transmissions of retransmission data from the another user terminal as the number of times of re-transmissions of the retransmission data transmitted by the user terminal.

12. The communication control method according to claim 9, further comprising:

deciding, by the user terminal, a modulation and coding scheme to be applied to the communication data transmitted by the user terminal after deciding the number of times of re-transmissions of the retransmission data transmitted by the user terminal.

13. A user terminal, comprising:

a transmitter configured to transmit a scheduling assignment indicating a location of a radio resource used in a reception of communication data by direct device-to-device communication, wherein

the transmitter transmits the communication data including initial transmission data and retransmission data by using the radio resource, and

the retransmission data is transmitted depending on a number of times of re-transmissions associated with a predetermined scheduling assignment by using a predetermined radio resource of which a location is indicated by the predetermined scheduling assignment.

14. A user terminal, comprising:

a transmitter configured to transmit a scheduling assignment indicating a location of a radio resource used in a reception of communication data by direct device-to-device communication, wherein

the transmitter transmits the communication data including initial transmission data and retransmission data by using the radio resource, and

the transmitter transmits, upon transmitting the communication data, a new data identifier indicating switching from a predetermined retransmission data to a next initial transmission data together with the initial transmission data or the retransmission data by using each of a plurality of small resources included in the radio resource.