WIRELESS COMMUNICATION BASE STATION DEVICE, WIRELESS COMMUNICATION RELAY DEVICE, WIRELESS COMMUNICATION TERMINAL DEVICE, PACKET RETRANSMISSION METHOD, AND WIRELESS COMMUNICATION SYSTEM

• US 20100322136A1
• Filed: 02/06/2009
• Published: 12/23/2010
• Est. Priority Date: 02/08/2008
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Horiuchi, Ayako, Kanazawa, Takeshi
• Granted Patent: US 8,693,413 B2
• Time in Patent Office: Days
• US Class Current: 370/312
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 12/1868 Measures taken after transmission, e.g. acknowledgments
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 2001/0097 Relays
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A wireless communication base station device capable of improving the reception quality of the MBMS data of UE without wasting wireless resources even if an error occurs in the MBMS data transmitted from an eNB when distributing the MBMS via a wireless access network composed of the eNB and an RS. In the device, a wireless quality determining section (162) outputs reception quality determination information indicating the reception quality between the UE and the device determined on the basis of a CQI included in the NACK signal received from the UE to a retransmission determining section (164). A retransmission data determining section (171) of the retransmission determining section (164) determines MBMS data to be retransmitted from the device and retransmission data (FEC encoding ratio of the MBMS data) to be retransmitted from the RS on the basis of the reception quality determination information inputted from the wireless quality determining section (162). The retransmission data determining section (171) notifies the RS of a request to relay the data including the FEC encoding ratio of the retransmission data to be retransmitted from the RS.

Claims

1. A radio communication base station apparatus comprising:

a transmitting section that transmits multimedia broadcast/multicast service (MBMS) data to a plurality of radio communication terminal apparatuses and a radio communication relay apparatus;

a receiving section that receives a negative acknowledgement signal from the plurality of radio communication terminal apparatuses;

a transmitting section that transmits first retransmission data retransmitted from the radio communication base station apparatus; and

a reporting section that reports, to the radio communication relay apparatus, a retransmission request for transmitting, to the plurality of radio communication terminal apparatuses, second retransmission data retransmitted from the radio communication relay apparatus.

2. The radio communication base station apparatus according to claim 1, further comprising a retransmission determining section that determines the first retransmission data and the second retransmission data based on channel quality information which is included in the negative acknowledgement signal and which indicates channel quality between each of the plurality of radio communication terminal apparatuses and the radio communication base station apparatus,

wherein the reporting section reports the retransmission request including structure information of the determined second retransmission data to the radio communication relay apparatus.

3. The radio communication base station apparatus according to claim 2, wherein, when channel quality information from the radio communication terminal apparatus that is a retransmission target of the first retransmission data or the second retransmission data is lower than a predetermined threshold, the retransmission determining section determines an information code part of encoded data acquired by encoding the multimedia broadcast/multicast service data, as the first retransmission data or the second retransmission data, and, when the channel quality information from the radio communication terminal apparatus that is the retransmission target of the first retransmission data or the second retransmission data is equal to or higher than the predetermined threshold, the retransmission determining section determines a redundant code part of the encoded data as the first retransmission data or the second retransmission data.

4. The radio communication base station apparatus according to claim 3, wherein, when the channel quality information from the radio communication terminal apparatus that is the retransmission target of the first retransmission data or the second retransmission data is equal to or higher than the predetermined threshold and the channel quality information is higher, the retransmission determining section determines the redundant code part of a shorter data length as the first retransmission data or the second retransmission data.

5. The radio communication base station apparatus according to claim 3, wherein, when the channel quality information from the radio communication terminal apparatus that is the retransmission target of the first retransmission data or the second retransmission data is equal to or higher than the predetermined threshold and the channel quality information is higher, the retransmission determining section increases a coding rate of the first retransmission data or the second retransmission data.

6. A radio communication relay apparatus comprising:

a relay section that relays multimedia broadcast/multicast service (MBMS) data received from a radio communication base station apparatus, to a radio communication terminal apparatus;

a storage section that stores the multimedia broadcast/multicast service data in a buffer;

an encoding section that encodes, when a retransmission request of the multimedia broadcast/multicast service data is reported from the radio communication base station apparatus, the multimedia broadcast/multicast service data based on structure information of retransmission data included in the retransmission request; and

a retransmitting section that retransmits the encoded multimedia broadcast/multicast service data to the radio communication terminal apparatus.

7. A radio communication terminal apparatus comprising:

a receiving section that receives multimedia broadcast/multicast service (MBMS) data;

a radio quality measuring section that measures channel quality between a radio communication base station apparatus and the radio communication terminal apparatus, using a reference signal from the radio communication base station apparatus, and generates channel quality information based on the measured channel quality;

a detecting section that detects whether or not an error is present in the multimedia broadcast/multicast service data; and

a transmitting section that transmits a negative acknowledgement signal including the channel quality information as a response signal when the error is detected.

8. A packet retransmission method comprising:

a transmitting step of transmitting multimedia broadcast/multicast service (MBMS) data to a plurality of radio communication terminal apparatuses and a radio communication relay apparatus;

a receiving step of receiving a negative acknowledgement signal including channel quality information indicating channel quality between each of the plurality of radio communication terminal apparatuses and a subject apparatus, as a response signal, from the plurality of radio communication terminal apparatuses;

a retransmission determining step of determining first retransmission data retransmitted from the subject apparatus and second retransmission data retransmitted from the radio communication relay apparatus; and

a reporting step of reporting a retransmission request including structure information of the determined second retransmission data to the radio communication relay apparatus.

9. A radio communication system comprising a radio communication base station apparatus, radio communication relay apparatus and radio communication terminal apparatus, wherein:

the radio communication base station apparatus comprises;

a transmitting section that transmits multimedia broadcast/multicast service (MBMS) data to a plurality of radio communication terminal apparatuses and a radio communication relay apparatus;

a receiving section that receives a negative acknowledgement signal including channel quality information indicating channel quality between each of the plurality of radio communication terminal apparatuses and the radio communication base station apparatus, as a response signal, from the plurality of radio communication terminal apparatuses;

a retransmission determining section that determines first retransmission data retransmitted from the radio communication base station apparatus and second retransmission data retransmitted from the radio communication relay apparatus; and

a reporting section that reports a retransmission request including structure information of the determined second retransmission data to the radio communication relay apparatus;

the radio communication relay apparatus comprises;

a relay section that relays the multimedia broadcast/multicast service data received from the radio communication base station apparatus, to the radio communication terminal apparatus;

a storage section that stores the multimedia broadcast/multicast service data in a buffer;

an encoding section that encodes, when a retransmission request of the multimedia broadcast/multicast service data is reported from the radio communication base station apparatus, the multimedia broadcast/multicast service data based on the structure information included in the retransmission request; and

a retransmitting section that retransmits the encoded multimedia broadcast/multicast service data to the radio communication terminal apparatus; and

the radio communication terminal apparatus comprises;

a receiving section that receives the multimedia broadcast/multicast service data;

a radio quality measuring section that measures channel quality between the radio communication base station apparatus and the radio communication terminal apparatus, using a reference signal from the radio communication base station apparatus, and generates channel quality information based on the measured channel quality;

a detecting section that detects whether or not an error is present in the multimedia broadcast/multicast service data; and

a transmitting section that transmits a negative acknowledgement signal including the channel quality information as a response signal when the error is detected.