APPARATUS AND METHOD FOR DETERMINING RESOURCES FOR PEER TO PEER COMMUNICATION IN COMMUNICATION SYSTEM

• US 20090011770A1
• Filed: 06/30/2008
• Published: 01/08/2009
• Est. Priority Date: 07/05/2007
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: LEE, Sang-Min, JUNG, Young-Ho, CHO, Myeon-Kyun
• Granted Patent: US 8,060,105 B2
• Time in Patent Office: Days
• US Class Current: 455/452.100
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0062 Avoidance of ingress interference, e.g. ham radio channels
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/245 taking into account received signal strength
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/383 power control in peer-to-peer links
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 92/18 between terminal devices

Abstract

A method and apparatus for allocating frequency resources for peer to peer (P2P) communication between terminals without a base station are provided. The method determines resources used for a direct communication between two terminals in a communication system. The method includes determining uplink frequency resources of a cellular communication system for use in the direct communication between the two terminals, determining a primary maximum transmission power to minimize interference caused by the direct communication on the cellular communication system and performing the direct communication between the two terminals by using the uplink frequency resources and a transmission power less than the determined primary maximum transmission power.

Claims

1. A method of determining resources used for direct communication between two terminals in a communication system, the method comprising:

determining uplink frequency resources of a cellular communication system for use in the direct communication between the two terminals;

determining a primary maximum transmission power to minimize interference caused by the direct communication on the cellular communication system; and

performing the direct communication between the two terminals using the uplink frequency resources and a transmission power less than the determined primary maximum transmission power.

2. The method of claim 1, wherein the uplink frequency resources are simultaneously used for the direct communication between the two terminals and cellular communication between a base station and at least one of the two terminals.

3. The method of claim 1, wherein the primary maximum transmission power is determined according to at least one of a distance between at least one of the two terminals and a base station, a receiving power, an interference value, a maximum transmission power, and a size of occupied resources.

4. The method of claim 3, wherein the determining of the uplink frequency resources comprises determining parameters according to at least one of an allowable interference level, a cellular communication resource occupancy rate, the number of terminals in a cell, and a distance between the base station and each terminal.

5. The method of claim 4, further comprising broadcasting information regarding the uplink frequency resources to terminals in the cell, wherein the base station performs the determining of the uplink frequency resources and the broadcasting

6. The method of claim 1, wherein the determining of the primary maximum transmission power comprises:

determining a control value relating to an allowable interference level according to at least one of a cellular communication resource occupancy rate, the number of terminals in a cell, and a distance between a base station and at least one of the two terminals;

broadcasting the control value to the terminals in the cell, wherein the base station performs the determining of the control value and the broadcasting; and

determining the primary maximum transmission power additionally according to at least one parameter of the control value, the distance between the base station and each terminal, a receiving power, interference, a maximum transmission power, and sizes of occupied resources, wherein each terminal performing the direct communication performs the determining of the primary maximum transmission power.

7. The method of claim 1, further comprising:

when the two terminals do not perform the direct communication within the primary maximum transmission power, requesting a base station to send a secondary maximum transmission power used for Peer-to-Peer (P2P) communication; and

if the secondary maximum transmission power is received from the base station, performing the direct communication using the uplink frequency resources within the secondary maximum transmission power.

8. The method of claim 1, wherein the performing of the direct communication comprises:

dividing the uplink frequency resources according to a method that is the same as that of dividing the uplink frequency resources used by a base station, and determining a plurality of hopping patterns used for the direct communication with regard to the divided uplink frequency resources;

informing one or more target terminals that perform the direct communication about a pattern selected from the plurality of hopping patterns; and

performing the direct communication by using frequency resources according to the selected pattern.

9. The method of claim 1, wherein the performing of the direct communication comprises:

dividing the uplink frequency resources according to a method that is different from that of dividing the uplink frequency resources of the cellular communication used by a base station, and performing the direct communication by using the divided uplink frequency resources.

10. An apparatus for determining resources used for direct communication between two terminals in a communication system, the apparatus comprising:

a device for determining a primary maximum transmission power to minimize interference caused by the direct communication of a cellular communication system when uplink frequency resources of the cellular communication system are used for the direct communication between the two terminals, and for determining that the uplink frequency resources are used as communication resources between the two terminals within the determined primary maximum transmission power.

11. The apparatus of claim 10, wherein the uplink frequency resources are simultaneously used for the direct communication between the two terminals and for cellular communication between a base station and at least one of the two terminals.

12. The apparatus of claim 10, wherein the primary maximum transmission power is determined according to at least one of a distance between at least one of the two terminals and a base station, a receiving power, an interference value, a maximum transmission power, and a size of occupied resources.

13. The apparatus of claim 12, wherein the base station determines the uplink frequency resources according to at least one of an allowable interference level, a cellular communication resource occupancy rate, the number of terminals in a cell, and a distance between the base station and each terminal.

14. The apparatus of claim 13, wherein the base station broadcasts information regarding the uplink frequency resources to terminals in the cell.

15. The apparatus of claim 10, wherein a base station determines a control value relating to an allowable interference level according to at least one of a cellular communication resource occupancy rate, the number of terminals in the cell, and a distance between a base station and each terminal, and broadcasts the control value to the terminals in the cell, and

each terminal performing the direct communication determines the primary maximum transmission power additionally according to at least one parameter of the control value, a distance between the base station and each terminal, a receiving power, interference, a maximum transmission power, and sizes of occupied resources.

16. The apparatus of claim 10, wherein, when the two terminals do not perform the direct communication within the primary maximum transmission power, at least one of the two terminals transmits a message requesting a secondary maximum transmission power used for the communication between the two terminals to a base station, and

if the at least one of the two terminals receives the secondary maximum transmission power from the base station, the two terminals perform the direct communication by using the uplink frequency resources within the secondary maximum transmission power.

17. The apparatus of claim 10, wherein the device divides the uplink frequency resources according to a method that is the same as that of dividing the uplink frequency resources used by a base station, determines a plurality of hopping patterns used for the direct communication with regard to the divided uplink frequency resources, informs one or more target terminals that perform the direct communication about a pattern selected from the plurality of hopping patterns, and performs the direct communication by using frequency resources according to the selected pattern.

18. The apparatus of claim 10, wherein the device divides the uplink frequency resources according to a method that is different from that of dividing the uplink frequency resources of the cellular communication used by a base station, and performs the direct communication by using the divided uplink frequency resources.