Wireless communication base station device, wireless communication relay device, wireless communication terminal device, packet retransmission method, and wireless communication system

• US 8,693,413 B2
• Filed: 02/06/2009
• Issued: 04/08/2014
• 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: Kanazawa, Takeshi, Horiuchi, Ayako
• Primary Examiner(s): Ton, Dang
• Assistant Examiner(s): RANDHAWA, MANDISH K
• Application Number:
  US12/866,694
• Publication Number:
  US 20100322136A1
• Time in Patent Office: 1,887 Days
• Field of Search: 370/312, 370/315, 370/329, 370/467, 370/252, 370/328, 714/790, 714746-750, 455/450
• US Class Current: 370/329
• 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 terminal apparatus comprising:

a receiving section that receives first scheduling information indicating a radio resource of a first multimedia broadcast/multicast service (MBMS) data from a radio communication base station apparatus, and receives the first MBMS data based on the first scheduling information;

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 (CQI) based on the measured channel quality;

a detecting section that detects whether or not an error is present in the first MBMS data; and

a transmitting section that determines whether or not to transmit a negative acknowledgement (NACK) signal including the CQI as a response signal;

wherein;

when the error is detected,

the transmitting section does not transmit the response signal in the event that second scheduling information is received from a radio communication relay apparatus that can communicate with the radio communication terminal apparatus, the second scheduling information indicating a radio resource of second MBMS data transmitted from the radio communication relay apparatus,

the transmitting section transmits the response signal in the event that the second scheduling information is not received from the radio communication relay apparatus, and

the receiving section receives, in the event that the second scheduling information is received, the second MBMS data from the radio communication relay apparatus based on the second scheduling information, and receives, in the event that the second scheduling information is not received, retransmission data retransmitted from the radio communication base station apparatus or the radio communication relay apparatus.

2. 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 first 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 first receiving section that receives a negative acknowledgement (NACK) signal

a determining section that selects, as a specific apparatus that retransmits retransmission data, either the radio communication base station apparatus or the radio communication relay apparatus such that all radio communication terminal apparatuses receive, from the selected specific apparatus, the same MBMS data with a received quality equal to or higher than a predetermined threshold, the all radio communication terminal apparatuses including a radio communication terminal apparatus that transmits the NACK signal among the plurality of radio communication terminal apparatuses;

a second transmitting section that transmits first retransmission data retransmitted from the radio communication base station apparatus, in the event that the selected specific apparatus is 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, the second retransmission data retransmitted from the radio communication relay apparatus, in the event that the selected specific apparatus is the radio communication relay apparatus;

the radio communication relay apparatus comprises;

a relay section that relays the MBMS data received from the radio communication base station apparatus, to the radio communication terminal apparatus;

a storage section that stores the MBMS data in a buffer;

an encoding section that encodes the MBMS data when the retransmission request of the MBMS data is reported from the radio communication base station apparatus, the MBMS data; and

a retransmitting section that retransmits the encoded MBMS data to the radio communication terminal apparatus; and

the radio communication terminal apparatus comprises;

a second receiving section that receives first scheduling information indicating a radio resource of a first MBMS data from the radio communication base station apparatus, and receives the first MBMS data based on the first scheduling information;

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 (CQI) based on the measured channel quality;

a detecting section that detects whether or not an error is present in the first MBMS data; and

a third transmitting section that determines whether or not to transmit the NACK signal including the CQI as a response signal;

wherein;

when the error is detected,

the third transmitting section does not transmit the response signal in the event that second scheduling information is received from a radio communication relay apparatus that can communicate with the radio communication terminal apparatus, the second scheduling information indicating a radio resource of second MBMS data transmitted from the radio communication relay apparatus,

the third transmitting section transmits the response signal in the event that the second scheduling information is not received from the radio communication relay apparatus, and

the second receiving section receives, in the event that the second scheduling information is received, the second MBMS data from the radio communication relay apparatus based on the second scheduling information, and receives, in the event that the second scheduling information is not received, retransmission data retransmitted from the radio communication base station apparatus or the radio communication relay apparatus.

3. A method for transmitting a response signal comprising:

receiving first scheduling information indicating a radio resource of a first multimedia broadcast/multicast service (MBMS) data from a radio communication base station apparatus, and receiving the first MBMS data based on the first scheduling information;

measuring 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 generating channel quality information based on the measured channel quality;

detecting whether or not an error is present in the first MBMS data; and

determining whether or not to transmit a negative acknowledgement signal including the channel quality information as the response signal;

wherein;

when the error is detected,

in determining whether or not to transmit the response signal, not transmitting the response signal in the event that second scheduling information is received from a radio communication relay apparatus that can communicate with the radio communication terminal apparatus, the second scheduling information indicating a radio resource of second MBMS data transmitted from the radio communication relay apparatus, and transmitting the response signal in the event that the second scheduling information is not received from the radio communication relay apparatus, and

receiving, in the event that the second scheduling information is received, the second MBMS data from the radio communication relay apparatus based on the second scheduling information, and receiving, in the event that the second scheduling information is not received, retransmission data retransmitted from the radio communication base station apparatus or the radio communication relay apparatus.