MOBILE COMMUNICATION METHOD

• US 20140044082A1
• Filed: 04/25/2012
• Published: 02/13/2014
• Est. Priority Date: 05/18/2011
• Status: Abandoned Application

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Iwamura, Mikio, Uchino, Tooru
• Application Number:
  US14/111,664
• Publication Number:
  US 20140044082A1
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

HARQ retransmission control in a Ud interface is appropriately performed. A mobile communication method according to the present invention includes a step A of transmitting, by a mobile station UE#1, a data signal to a mobile station UE#2 via a third radio link, and a step B of transmitting, by the mobile station UE#2, transmission acknowledgment information (Ack/Nack) for the data signal to a radio base station eNB or the mobile station UE#1 via a second radio link.

Claims

1. A mobile communication method used in a case where a first radio link is set in a radio base station interface between a first mobile station and a radio base station, a second radio link is set in a radio base station interface between a second mobile station and the radio base station, and a third radio link is set in an inter-mobile station interface between the first mobile station and the second mobile station, comprising:

a step A of transmitting, by the first mobile station, a data signal to the second mobile station via the third radio link; and

a step B of transmitting, by the second mobile station, transmission acknowledgment information for the data signal to the radio base station or the first mobile station via the second radio link.

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

a step C of transmitting, by the radio base station, a retransmission instruction signal of the data signal via the third radio link to the first mobile station by using a physical downlink control channel via the first radio link when the transmission acknowledgment information indicates a negative transmission acknowledgment result.

3. The mobile communication method according to claim 2, wherein the retransmission instruction signal is transmitted also to the second mobile station via the second radio link.

4. The mobile communication method according to claim 2, wherein in the step C, instead of the retransmission instruction signal, the radio base station transmits the transmission acknowledgment information, which is received from the second mobile station via the second radio link, to the first mobile station via the first radio link.

5. The mobile communication method according to claim 1, wherein in the step B, the second mobile station transmits the transmission acknowledgment information to the first mobile station via the third radio link, together with the radio base station.

6. The mobile communication method according to claim 4, comprising:

a step of retransmitting, by the first mobile station, the data signal on the basis of the retransmission instruction signal, when the retransmission instruction signal is received from the radio base station; and

a step of retransmitting, by the first mobile station, the data signal on the basis of the retransmission acknowledgment information, which is received from the radio base station, when the transmission instruction signal is not received from the radio base station.

7. The mobile communication method according to claim 4, comprising:

a step of receiving, by the second mobile station, the retransmitted data signal on the basis of the retransmission instruction signal when the retransmission instruction signal is received from the radio base station; and

a step of receiving, by the second mobile station, the retransmitted data signal on the basis of the transmission acknowledgment information, which is received from the radio base station, when the retransmission instruction signal is not received from the radio base station.

8. The mobile communication method according to claim 5, comprising:

a step of retransmitting, by the first mobile station, the data signal on the basis of the retransmission instruction signal, when the retransmission instruction signal is received from the radio base station; and

a step of retransmitting, by the first mobile station, the data signal on the basis of the transmission acknowledgment information, which is received from the second mobile station, when the retransmission instruction signal is not received from the radio base station.

9. The mobile communication method according to claim 5, comprising:

a step of receiving, by the second mobile station, the retransmitted data signal on the basis of the retransmission instruction signal when the retransmission instruction signal is received from the radio base station; and

a step of receiving, by the second mobile station, the retransmitted data signal on the basis of the transmission acknowledgment information, which is transmitted by the second mobile station, when the retransmission instruction signal is not received from the radio base station.

10. The mobile communication method according to claim 1, wherein an RLC layer is terminated between the first mobile station and the second mobile station.

11. The mobile communication method according to claim 10, wherein retransmission of the data signal is performed by the RLC layer of the first mobile station.