Hybrid wireless communication system and communication method using the same

• US 20070121531A1
• Filed: 09/08/2006
• Published: 05/31/2007
• Est. Priority Date: 09/08/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd., University of Edinburgh
• Original Assignee: Samsung Electronics Co. Ltd., The University Court of the University of Aberdeen
• Inventors: Yun, Sang-Boh, Haas, Harald, McLaughlin, Stephen, Lee, Yeon-Woo, Hassan, Khaled
• Granted Patent: US 8,126,472 B2
• Time in Patent Office: Days
• US Class Current: 370/280
• CPC Class Codes: H04B 7/2615 using hybrid frequency-time division multiple access [FDMA-TDMA]
• CPC Class Codes: H04L 1/0018 based on latency requirement
• CPC Class Codes: H04L 2001/0097 Relays
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user
• CPC Class Codes: H04W 88/10 adapted for operation in multiple networks, e.g. multi-mode access points

Abstract

Disclosed is a hybrid wireless communication system and a communication method in the system. The system supports time and frequency division duplexing modes and includes a base station having a cellular communication range based on a cellular mode and mobile stations within the cellular communication range. The base station divides each available frequency resource into frames for communication, and each frame switches between a real-time service mode and a non-real-time service mode at a switching time within the frame. Communication is performed with the mobile stations within the cellular communication range via at least one of an uplink and a downlink in the real-time service mode of each frame according to the frequency division duplexing mode. Communication is performed with the mobile stations via the uplink and the downlink in the non-real-time service mode of each frame according to an ad hoc mode based on the time division duplexing mode.

Claims

1. A hybrid wireless communication system supporting a time division duplexing mode and a frequency division duplexing mode, the system comprising:

a base station having a cellular communication range based on a cellular mode; and

a plurality of mobile stations within the cellular communication range,

wherein the base station divides each available frequency resource into frames for communication, each frame switches between a real-time service mode and a non-real-time service mode at a switching time within the frame, communication is performed with the mobile stations within the cellular communication range via at least one of a uplink and a downlink in the real-time service mode of each frame according to the frequency division duplexing mode, and communication is performed with the mobile stations via the uplink and the downlink in the non-real-time service mode of each frame according to an ad hoc mode based on the time division duplexing mode.

2. The system as claimed in claim 1, wherein the base station designates one of the plurality of mobile stations spaced a predetermined distance from the base station as a gateway of a satellite cell in the non-real-time service mode and, after data is transmitted to the gateway, the base station functions as a gateway in the ad hoc mode with regard to mobile stations in a selected range adjacent to the base station.

3. The system as claimed in claim 1, wherein, when communication is performed in the ad hoc mode, one of the plurality of mobile stations spaced a predetermined distance from the base station is designated as a gateway mobile station, satellite cells are constructed by using the gateway mobile station, and an identical frequency resource is allocated to at least two satellite cells, a hop distance between the satellite cells being at least 2.

4. The system as claimed in claim 3, wherein a time slot is allocated to the satellite cells, the identical frequency resource having been allocated to the satellite cells, in a symmetric resource allocation method.

5. The system as claimed in claim 1, wherein a location of the switching time of each frame is varied based on a real-time service and a non-real-time service request.

6. A communication method in a hybrid wireless communication system supporting a time division duplexing mode and a frequency division duplexing mode, the system having a base station having a cellular communication range based on a cellular mode and the plurality of mobile stations within the cellular communication range, the method comprising the steps of:

dividing each available frequency resource into frames and setting each frame so that the frame switches between a real-time service mode and a non-real-time service mode at a switching time within the frame;

communicating with the mobile stations within the cellular communication range via at least one of an uplink and a downlink in the real-time service mode of each frame according to the frequency division duplexing mode; and

communicating with the mobile stations via the uplink and the downlink in the non-real-time service mode of each frame according to an ad hoc mode based on the time division duplexing mode.

7. The method as claimed in claim 6, further comprising:

designating by the base station one of the plurality of mobile stations spaced a predetermined distance from the base station as a gateway of a satellite cell in the non-real-time service mode; and

operating the base station as a gateway in the ad hoc mode with regard to mobile stations in a selected range adjacent to the base station after data is transmitted to the gateway of the satellite cell in the non-real-time service mode.

8. The method as claimed in claim 6, wherein, when communication is performed in the ad hoc mode, one of the plurality of mobile stations spaced a predetermined distance from the base station is designated as a gateway mobile station of a satellite cell, and an identical frequency resource is allocated to at least two satellite cells, a hop distance between the satellite cells being at least 2.

9. The method as claimed in claim 8, wherein a time slot is allocated to the satellite cells, the identical frequency resource having been allocated to the satellite cells, in a symmetric resource allocation method.

10. The method as claimed in claim 6, wherein a location of the switching time of each frame is varied based on a real-time service and a non-real-time service request.