COMMUNICATION TERMINAL DEVICE AND COMMUNICATION RELAY METHOD

• US 20090135933A1
• Filed: 12/29/2008
• Published: 05/28/2009
• Est. Priority Date: 03/11/2004
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: MIYOSHI, Kenichi
• Granted Patent: US 8,447,244 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04B 7/15542 Selecting at relay station its transmit and receive resources selection of wireless resources by user or terminal H04W72/02; arrangements affording multiple use of the transmission path by two-dimensional division of the resources H04L5/0003, or by allocating sub-channels H04L5/003
• CPC Class Codes: H04L 25/20 Repeater circuits; Relay circuits
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

There is provided a mobile station device in a multi-hop system capable of realizing relay of communication of another station while suppressing increase of power consumption of the local station. In this device, at timing t1, a mobile station MS2 transmits data S2 destined to a base station BS1, to a mobile station MS1. The mobile station MS1 receives the data S2 and temporarily stores it in a buffer. The mobile station MS1 waits until timing t4 when the data S1 of the mobile station MS1 is to be transmitted. When this timing has come, the data S2 stored in the buffer is multiplexed with the data S1 of the mobile station MS1 and transmitted to the base station BS1.

Claims

1. A communication terminal apparatus that relays communication between a base station and another communication terminal in a communication system of an OFDM (Orthogonal Frequency Division Multiplex) scheme, said communication terminal apparatus comprising:

a storage section that stores communication data between the base station and the another communication terminal; and

a transmission section that frequency division multiplexes the stored communication data with data of the communication terminal apparatus and transmits the frequency division multiplexed data at a timing for transmitting the data of the communication terminal apparatus.

2. The communication terminal apparatus according to claim 1, wherein said transmission section maps the stored communication data to an available subcarrier to which the data of the communication terminal apparatus is not mapped among subcarriers that the communication terminal apparatus can use, and performs the frequency division multiplexing.

3. The communication terminal apparatus according to claim 1, further comprising a reporting section that reports to the base station that requests to relay the communication data or the another communication terminal that said transmission section transmits communication data between the base station and the another communication terminal.

5. The communication terminal apparatus according to claim 1, wherein said communication system is a communication system of an OFDM-FDD (Orthogonal Frequency Division Multiplex-Frequency Division Duplex), further comprising a reception system that performs reception processing in uplink frequency, wherein

said communication terminal apparatus transmits the stored data to the another communication terminal in uplink frequency.

4. A communication terminal apparatus that communicates with a base station via a relay of another communication terminal in a communication system of an OFDM-TDD (Orthogonal Frequency Division Multiplex-Time Division Duplex) scheme, wherein said communication terminal apparatus performs reception processing at a timing for uplink communication for the communication system.

6. A communication terminal apparatus that communicates with a base station via a relay of another communication terminal in a communication system of an OFDM-FDD (Orthogonal Frequency Division Multiplex-Frequency Division Duplex) scheme, said communication terminal apparatus comprising a reception system that performs reception processing in uplink frequency, wherein said communication terminal apparatus transmits data of the communication terminal apparatus to the another communication terminal in uplink frequency.

7. A communication relay method that is used at a communication terminal relaying communication between a base station and another communication terminal in a communication system of an OFDM scheme, said communication relay method comprising:

a storage step of storing communication data between the base station and the another communication terminal in a buffer;

a multiplexing step of frequency division multiplexing the stored communication data with data of the communication terminal; and

a transmission step of transmitting the frequency division multiplexed data at a timing for transmitting data of the communication terminal.

8. A communication system that is a communication system of an OFDM scheme comprising a base station and a plurality of communication terminals, wherein:

when a first communication terminal is requested to relay communication with the base station from a second communication terminal, the first communication terminal temporarily stores relay data and frequency division multiplexes the relay data with data of the first communication terminal, transmits the frequency division multiplexed data at a timing for transmitting the data of the first communication terminal, and reports the relay to the second communication terminal; and

when the second communication terminal receives the report of the relay from the first communication terminal, the second communication terminal reports the relay to a user of the second communication terminal.

9. A communication apparatus that relays communication between a first communication apparatus and a second communication apparatus in a communication system of an OFDM scheme, said communication apparatus comprising:

a storage section that stores communication data between the first communication apparatus and the second communication apparatus; and

a transmission section that frequency division multiplexes the stored communication data with data of the communication apparatus and transmits the multiplexed data at a timing for transmitting the data of the communication apparatus.