WIRELESS COMMUNICATION SYSTEM FOR INTERCONNECTING AD-HOC NETWORK AND INFRASTRUCTURE NETWORK, AND WIRELESS TERMINAL AND COMMUNICATION METHOD THEREFOR

• US 20090213760A1
• Filed: 02/18/2009
• Published: 08/27/2009
• Est. Priority Date: 02/22/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: NOH, Kyoung-Lae, PARK, In-Ho, KIM, Giu-Yeol, SHIN, Dong-Yun
• Granted Patent: US 8,243,622 B2
• Time in Patent Office: Days
• US Class Current: 370/254
• CPC Class Codes: H04W 36/00 Hand-off or reselection arrangements
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 8/24 Transfer of terminal data
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• 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 92/02 Inter-networking arrangements

Abstract

A wireless communication system for interconnecting an ad-hoc network and an IS network, and a wireless terminal and communication method therefor are disclosed. The communication method includes transmitting a discovery signal including terminal information of the wireless terminal to a radio network, receiving a response signal including information for network access from a base station or another wireless terminal, which has received the discovery signal, selecting an operation mode for access to a network through the base station or the other wireless terminal, based on the response signal, communicating with the base station and accessing the IS network when the selected operation mode corresponds to a first mode and accessing a network, to which the other wireless terminal belongs, through a licensed frequency band of the IS network when the selected operation mode corresponds to a second mode. Accordingly, it is possible to support communication through an existing infrastructure and support communication of an ad-hoc network scheme, through use of a licensed frequency band assigned to the provider of an existing IS network.

Claims

1. A communication method of a wireless terminal in a wireless communication system comprising an Infrastructure (IS) network, the method comprising:

transmitting a discovery signal comprising terminal information of the wireless terminal to a radio network;

receiving a response signal comprising information for network access from one of a base station and another wireless terminal, which received the discovery signal;

selecting an operation mode for access to a network through one of the base station and the other wireless terminal, based on the response signal;

communicating with the base station and accessing the IS network when the selected operation mode corresponds to a first mode; and

accessing a network, to which the other wireless terminal belongs, through a licensed frequency band of the IS network when the selected operation mode corresponds to a second mode.

2. The method of claim 1, wherein the second mode comprises a dual mode for accessing an ad-hoc network, to which the other wireless terminal belongs, that uses a licensed frequency band of the IS network.

3. The method of claim 1, wherein the second mode comprises a relay mode for communicating with the IS network by using the other wireless terminal as a relay station, when there is no ad-hoc network to which the other wireless terminal belongs.

4. The method of claim 1, further comprising:

determining a wireless terminal comprising a highest access priority in a certain scheme, when the other wireless terminal that transmitted the response signal is plural in number; and

accessing a network based on a response signal received from the other wireless terminal comprising the highest access priority.

5. The method of claim 2, further comprising transmitting updated information of the ad-hoc network to the IS network, when the wireless terminal is approved to access the ad-hoc network.

6. The method of claim 1, further comprising:

selecting a third mode for configuring a new ad-hoc network as the operation mode, when the response signal is not received from one of the base station of the IS network and the other wireless terminal after the transmission of the discovery signal;

determining whether an adjacent terminal exists; and

configuring the new ad-hoc network when an adjacent terminal exists.

7. The method of claim 2, further comprising receiving service authentication from the IS network after accessing the ad-hoc network.

8. The method of claim 7, wherein the service authentication is performed through transmission and reception of control information between the base station of the IS network and a leader terminal of the ad-hoc network.

9. A wireless terminal in a wireless communication system comprising an Infrastructure (IS) network, the wireless terminal comprising:

a discovery signal transmission and reception unit for transmitting a discovery signal comprising terminal information of the wireless terminal to a radio network and for receiving a response signal comprising information for network access from one of a base station and another wireless terminal, which has received the discovery signal;

an operation mode selection unit for analyzing the response signal and selecting an operation mode suitable for current network circumstance; and

a mode control unit for performing a control operation to communicate with the base station, to access the IS network when the selected operation mode corresponds to a first mode and to access a network, to which the another wireless terminal belongs, through a licensed frequency band of the IS network when the selected operation mode corresponds to a second mode.

10. The wireless terminal of claim 9, wherein the second mode comprises a dual mode for accessing an ad-hoc network, to which the other wireless terminal belongs, that uses the licensed frequency band of the IS network.

11. The wireless terminal of claim 9, wherein the second mode comprises a relay mode for communicating with the IS network by using the other wireless terminal as a relay station, when there is no ad-hoc network to which the other wireless terminal belongs.

12. The wireless terminal of claim 9, wherein, when the other wireless terminal that transmitted the response signal is plural in number, the mode control unit further performs a control operation to determine a wireless terminal comprising a highest access priority in a certain scheme and to access a network based on a response signal received from the other wireless terminal comprising the highest access priority.

13. The wireless terminal of claim 9, wherein, when the response signal is not received from one of the base station of the IS network and the other wireless terminal after the transmission of the discovery signal, the operation mode selection unit selects a third mode for configuring a new ad-hoc network as the operation mode, and the mode control unit further performs a control operation to determine whether an adjacent terminal exists and to configure the new ad-hoc network when an adjacent terminal exists.

14. The wireless terminal of claim 9, further comprising a control information transmission and reception unit for transmitting and receiving control information to and from the base station of the IS network the control information comprising at least one of network access information, service authentication information and resource usage authentication information.

15. A wireless communication system comprising an Infrastructure (IS) network, the system comprising:

at least one wireless terminal for transmitting a discovery signal comprising terminal information of the wireless terminal to a radio network, for receiving a response signal comprising information for network access from one of a base station and another wireless terminal, which received the discovery signal, for selecting an operation mode suitable for the current network circumstance by analyzing the response signal, for communicating with the base station and accessing the IS network when the selected operation mode corresponds to a first mode and for accessing a network, to which the other wireless terminal belongs, through a licensed frequency band of the IS network when the selected operation mode corresponds to a second mode; and

the base station of the IS network for assigning the licensed frequency band.

16. The system of claim 15, wherein the second mode comprises a dual mode for accessing an ad-hoc network, to which the other wireless terminal belongs, that uses the licensed frequency band of the IS network.

17. The system of claim 15, wherein the second mode comprises a relay mode for communicating with the IS network by using the other wireless terminal as a relay station, when there is no ad-hoc network to which the other wireless terminal belongs.

18. The system of claim 15, wherein, when the response signal is not received from one of the base station of the IS network and the other wireless terminal after the transmission of the discovery signal, the at least one wireless terminal selects a third mode for configuring a new ad-hoc network as the operation mode, determines whether an adjacent terminal exists and configures the new ad-hoc network when an adjacent terminal exists.

19. The system of claim 15, wherein, when the other wireless terminal that transmitted the response signal is plural in number, the at least one wireless terminal determines a wireless terminal comprising a highest access priority in a certain scheme, accesses a network based on a response signal received from the other wireless terminal comprising the highest access priority.

20. The system of claim 18, wherein the base station of the IS network is configured to transmit and receive control information to and from the at least one wireless terminal, the control information comprising at least one of network access information, network management information, service authentication information, and resource usage authentication information.