Mobile communication system and mobile communication method used in a mobile communication system

• US 9,515,801 B2
• Filed: 07/23/2013
• Issued: 12/06/2016
• Est. Priority Date: 07/27/2012
• Status: Active Grant

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: Fujishiro, Masato, Yamazaki, Chiharu, Morita, Kugo
• Primary Examiner(s): Chery, Dady
• Application Number:
  US14/416,132
• Publication Number:
  US 20150180635A1
• Time in Patent Office: 1,232 Days
• Field of Search: 370/229, 370/230, 370/235, 370/328, 370/329, 370/341
• US Class Current: 1/1
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 2001/0097 Relays
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• 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

A mobile communication system performs communication of user data directly among a plurality of radio terminals without passing through a radio base station. The communication of user data directly performed among the plurality of radio terminals is performed by using apart of radio resources assigned to the mobile communication system. The plurality of radio terminals comprise: a transmission-side terminal that transmits the user data; and a reception-side terminal that receives the user data. The reception-side terminal transmits to a radio base station in a connected state where a radio connection is established with the reception-side terminal, a transmission acknowledgment signal indicating whether the user data transmitted from the transmission-side terminal has been received.

Claims

1. A mobile communication system, comprising:

a first radio terminal;

a second radio terminal; and

a radio base station, wherein

the radio base station transmits, to the first radio terminal, assignment information of a radio resource used in communication directly performed without passing through the radio base station,

the first radio terminal transmits user data to the second radio terminal by the communication,

the second radio terminal transmits, to the radio base station, a transmission acknowledgment signal indicating whether the user data transmitted by the communication from the first radio terminal has been received, and

the radio base station calculates data amount in the communication between the first radio terminal and the second radio terminal, on a basis of the transmission acknowledgment signal and the assignment information of the radio resource.

2. The mobile communication system according to claim 1, wherein the radio base station notifies the first radio terminal whether the user data transmitted from the first radio terminal has been received.

3. The mobile communication system according to claim 1, wherein the transmission acknowledgment signal includes an identifier of the first radio terminal.

4. The mobile communication system according to claim 1, wherein the transmission acknowledgment signal includes an identifier of the second radio terminal.

5. The mobile communication system according to claim 1, wherein the radio base station notifies an upper node of the radio base station of the calculated data amount.

6. The mobile communication system according to claim 5, wherein the radio base station notifies the upper node of the radio base station of the identifier of the first radio terminal and the identifier of the second radio terminal, together with the calculated data amount.

7. The mobile communication system according to claim 1, wherein the first radio terminal receives the transmission acknowledgment signal transmitted to the radio base station in the connected state.

8. A mobile communication method used in a mobile communication system,

comprising:

transmitting, by a radio base station, to a first radio terminal, assignment information of a radio resource used in communication directly performed without passing through the radio base station,

transmitting, by the first radio terminal, user data to a second radio terminal by the communication,

transmitting, by the second radio terminal, to the radio base station, a transmission acknowledgment signal indicating whether the user data transmitted by the communication from the first radio terminal has been received, and

the radio base station calculates data amount in the communication between the first radio terminal and the second radio terminal, on a basis of the transmission acknowledgment signal and the assignment information of the radio resource.

9. A radio base station, comprising:

a controller configured to calculate data amount in communication directly performed between a first radio terminal and a second radio terminal without passing through the radio base station;

a transmitter configured to transmit to the first radio terminal, assignment information of a radio resource used in the communication; and

a receiver configured to receive a transmission acknowledgment signal from the second radio terminal, the transmission acknowledgment signal indicating whether the user data transmitted by the communication from the first radio terminal has been received, wherein

the controller calculates the data amount on a basis of the transmission acknowledgment signal and the assignment information of the radio resource.