Wireless communication system, router apparatus, wireless communication method, and program

• US 8,442,018 B2
• Filed: 09/09/2009
• Issued: 05/14/2013
• Est. Priority Date: 09/26/2008
• Status: Active Grant

• Current Assignee: NEC Platforms, Ltd. (NEC Corporation)
• Original Assignee: NEC Access Technica Limited (NEC Corporation), NEC Corporation
• Inventors: Okamoto, Tsukasa, Yahagi, Masahiko
• Primary Examiner(s): PHUNKULH, BOB A
• Application Number:
  US13/058,086
• Publication Number:
  US 20110134814A1
• Time in Patent Office: 1,343 Days
• Field of Search: None
• US Class Current: 370/338
• 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: H04B 7/15564 Relay station antennae loop interference reduction
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow

Abstract

A wireless communication system includes a first communication apparatus that uses first frequency band to communicate wirelessly by time division method, a second communication apparatus that uses second frequency band adjacent to the first frequency band to communicate wirelessly by time division method, and a router apparatus that relays data communicated wirelessly in the first and second communication apparatus. The router apparatus includes a first communication unit that uses the first frequency band to communicate wirelessly by time division method with the first communication apparatus, a second communication unit that uses the second frequency band to communicate wirelessly by time division method with the second communication apparatus simultaneously with wireless communication by the first communication unit, and a controller that causes transmission intervals and reception intervals in the second communication unit to coincide with transmission intervals and reception intervals that are partitioned by time divisions in the first communication unit.

Claims

1. A wireless communication system that includes a first communication apparatus that uses a first frequency band to carry out wireless communication by a time division method;

a second communication apparatus that uses a second frequency band that is adjacent to said first frequency band to carry out wireless communication by a time division method; and

a router apparatus that relays data that are communicated wirelessly in said first communication apparatus and said second communication apparatus;

wherein said router apparatus comprises;

a first communication unit that uses said first frequency band to carry out wireless communication by a time division method with said first communication apparatus;

a second communication unit that uses said second frequency band to carry out wireless communication by a time division method with said second communication apparatus simultaneously with wireless communication by means of said first communication unit; and

a control unit that causes each of the transmission intervals and reception intervals of data in said second communication unit to coincide with each of the transmission intervals and reception intervals of data that have been partitioned into time divisions in said first communication unit.

2. The wireless communication system as set forth in claim 1, wherein said control unit, upon reception by said second communication unit of a transmission request message from said second communication apparatus requesting transmission of data, matches with the start of the next reception interval in said first communication unit, and transmits from said second communication unit to said second communication apparatus a reception preparation completion message indicating that preparation for reception of data has been completed.

3. The wireless communication system as set forth in claim 2, wherein said control unit, having received said transmission request message from said second communication apparatus, despite receiving said transmission request message from another second communication apparatus, does not transmit said reception preparation completion message to the other second communication apparatus during the subsequent interval until completion of transmission to said second communication apparatus of a reception completion notification message indicating that reception of data has been completed.

4. The wireless communication system as set forth in claim 1, wherein:

said first communication apparatus is a communication apparatus for WiMAX communication that uses a TDD (Time Division Duplex) method; and

said second communication apparatus is a communication apparatus for wireless LAN communication.

5. A router apparatus that relays data that are wirelessly communicated in a first communication apparatus that uses a first frequency band to carry out wireless communication by a time division method and a second communication apparatus that uses a second frequency band that is adjacent to said first frequency band to carry out wireless communication by a time division method;

said router apparatus comprising;

a first communication unit that uses said first frequency band to carry out wireless communication by a time division method with said first communication apparatus;

a second communication unit that uses said second frequency band to carry out wireless communication by a time division method with said second communication apparatus simultaneously with wireless communication by said first communication unit; and

a control unit that causes each of the transmission intervals and reception intervals of data in said second communication unit to coincide with each of the transmission intervals and reception intervals of data that have been partitioned by time divisions in said first communication unit.

6. The router apparatus as set forth in claim 5, wherein said control unit, upon reception by said second communication unit of a transmission request message from said second communication apparatus requesting transmission of data, matches with the start of the next reception interval in said first communication unit, and transmits from said second communication unit to said second communication apparatus a reception preparation completion message indicating that preparation for reception of data has been completed.

7. The router apparatus as set forth in claim 6, wherein said control unit, having received said transmission request message from said second communication apparatus, despite receiving said transmission request message from another second communication apparatus, does not transmit said reception preparation completion message to the other second communication apparatus during the subsequent interval until completion of transmission to said second communication apparatus of a reception completion notification message indicating that reception of data has been completed.

8. The router apparatus as set forth in claim 5, wherein:

said first communication apparatus is a communication apparatus for WiMAX communication that uses a TDD method; and

said second communication apparatus is a communication apparatus for wireless LAN communication.

9. A wireless communication method that is realized by a router apparatus that relays data that are wirelessly communicated in a first communication apparatus that uses a first frequency band to carry out wireless communication by a time division method and a second communication apparatus that uses a second frequency band that is adjacent to said first frequency band to carry out wireless communication by a time division method, said wireless communication method comprising:

a first communication step of using said first frequency band to carry out wireless communication by a time division method with said first communication apparatus;

a second communication step of using said second frequency band to carry out wireless communication by a time division method with said second communication apparatus simultaneously with said first communication step; and

a control step of causing each of the transmission intervals and reception intervals of data in said second communication step to coincide with each of the transmission intervals and reception intervals of data that are partitioned by time divisions in said first communication step.

10. The wireless communication method as set froth in claim 9, wherein, in said control step, upon reception of a transmission request message from said second communication apparatus requesting transmission of data, a reception preparation completion message indicating that preparation for reception of data has been completed is transmitted to said second communication apparatus matched with the start of the next reception interval in said first communication step.

11. The wireless communication method as set forth in claim 10, wherein, in said control step, when said transmission request message is received from said second communication apparatus, despite reception of said transmission request message from another second communication apparatus, said reception preparation completion message is not transmitted to the other second communication apparatus during the subsequent interval until the completion of transmission to said second communication apparatus of a reception completion notification message indicating that reception of data has been completed.

12. The wireless communication method as set forth in claim 9, wherein:

said first communication apparatus is a communication apparatus for WiMAX communication that uses a TDD method; and

said second communication apparatus is a communication apparatus for wireless LAN communication.