APPARATUS AND METHOD FOR SUPPORTING PEER TO PEER COMMUNICATION IN A BROADBAND WIRELESS COMMUNICATION SYSTEM

• US 20100254281A1
• Filed: 04/07/2010
• Published: 10/07/2010
• Est. Priority Date: 04/07/2009
• Status: Active Grant

• Current Assignee: Korea Advanced Institute of Science and Technology, Samsung Electronics Co. Ltd.
• Original Assignee: Korea Advanced Institute of Science and Technology, Samsung Electronics Co. Ltd.
• Inventors: LEE, Ji-Hyun, LEE, Joo-Hyun, KIM, Young-Ki, SON, Kyu-Ho, KIM, Bong-Chan, CHONG, Song, YOON, Soon-Young
• Granted Patent: US 8,295,241 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 67/104 Peer-to-peer [P2P] networks
• CPC Class Codes: H04W 72/30 Resource management for broadcast services

Abstract

An apparatus and method for supporting Peer to Peer (P2P) communication in a broadband wireless communication system are provided. A P2P zone within a frame used for the P2P communication includes at least one channel, each channel includes a broadcasting zone and a contention zone, and a P2P-mode transmit Mobile Station (MS) transmits a reference signal through a broadcasting zone of a channel to which itself belongs. The method MS includes determining an interference sum for each channel within the P2P zone, comparing the determined interference sums with each other, selecting a channel having the least interference sum, and transmitting information regarding the selected channel to a Base Station (BS).

Claims

1. An operation method of a Mobile Station (MS) in a wireless communication system supporting Peer to Peer (P2P) communication,

wherein a P2P zone within a frame used for the P2P communication includes at least one channel, each channel comprises a broadcasting zone and a contention zone, and a P2P-mode transmit MS transmits a reference signal through a broadcasting zone of a channel to which it belongs,

the method comprising:

determining an interference sum for each channel within the P2P zone;

comparing the determined interference sums with each other;

selecting a channel comprising the least interference sum; and

transmitting information regarding the selected channel to a Base Station (BS).

2. The method of claim 1, further comprising, after transmitting the selected channel information, performing P2P communication with a called MS through the selected channel.

3. The method of claim 2, wherein the P2P communication is performed in a contention scheme.

4. The method of claim 3, wherein the contention scheme comprises a Carrier Sense Multiple Access (CSMA) scheme.

5. The method of claim 2, further comprising, during the P2P communication:

determining an interference sum for each channel within the P2P zone;

comparing the determined interference sums with each other, and selecting a channel comprising the least interference sum; and

if the selected channel is different from a current in-communication channel, performing a channel change.

6. The method of claim 5, wherein the performing of the channel change comprises:

generating a random number;

comparing the generated random number with a preset probability value;

if the random number is greater than the probability value, changing a channel; and

transmitting information regarding the changed channel to the BS.

7. The method of claim 1, wherein the determining of the interference sum comprises measuring a Received Signal Strength Indicator (RSSI) of a signal received at a broadcasting zone of each channel.

8. An operation method of a Base Station (BS) in a wireless communication system supporting a Peer to Peer (P2P) mode, the method comprising:

determining a channel count within a P2P zone adaptively to a currently set P2P connection count; and

variably assigning a P2P zone to a frame duration according to the determined channel count.

9. The method of claim 8, wherein the determining of the channel count comprises:

increasing a P2P connection count whenever a P2P connection is set, and decreasing the P2P connection count whenever the P2P connection is unset;

increasing the channel count within the P2P zone whenever a channel within the P2P zone is set, and decreasing the channel count whenever the channel is unset;

if the channel count is less than a preset maximum channel count and is less than the P2P connection count, additionally setting a channel; and

if the P2P connection count is less than the channel count, unsetting a channel with no P2P connection.

10. The method of claim 8, further comprising, if all P2P connections are unset, unsetting the assigned P2P zone.

11. The method of claim 8, wherein the P2P zone comprises at least one channel, each channel comprises a broadcasting zone and a contention zone, and a P2P-mode transmit Mobile Station (MS) transmits a reference signal through a broadcasting zone of a channel to which it belongs.

12. A Mobile Station (MS) apparatus in a wireless communication system supporting Peer to Peer (P2P) communication,

wherein a P2P zone within a frame used for the P2P communication includes at least one channel, each channel includes a broadcasting zone and a contention zone, and a P2P-mode transmit MS transmits a reference signal through a broadcasting zone of a channel to which it belongs,

the apparatus comprising:

a P2P channel interference measurer for determining an interference sum for each channel within the P2P zone;

a P2P communication controller for comparing the determined interference sums with each other, and for selecting a channel comprising the least interference sum; and

a message processor for transmitting information regarding the selected channel to a Base Station (BS).

13. The apparatus of claim 12, further comprising a controller for, after transmitting the selected channel information, performing a control for P2P communication with a called MS through the selected channel.

14. The apparatus of claim 13, wherein the P2P communication is performed in a contention scheme.

15. The apparatus of claim 14, wherein the contention scheme comprises a Carrier Sense Multiple Access (CSMA) scheme.

16. The apparatus of claim 13, wherein, during the P2P communication, the P2P channel interference measurer determines an interference sum for each channel within the P2P zone.

17. The apparatus of claim 16, wherein, during the P2P communication, the P2P communication controller compares the determined interference sums with each other, selects a channel comprising the least interference sum and, if the selected channel is different from a current in-communication channel, performs a channel change.

18. The apparatus of claim 17, wherein the P2P communication controller generates a random number, compares the generated random number with a preset probability value and, if the random number is greater than the probability value, changes a channel.

19. The apparatus of claim 18, wherein the message processor transmits information regarding the changed channel to the BS.

20. The apparatus of claim 12, wherein the P2P channel interference measurer measures a Received Signal Strength Indicator (RSSI) of a signal received at a broadcasting zone of each channel.

21. A Base Station (BS) apparatus in a wireless communication system supporting a Peer to Peer (P2P) mode, the apparatus comprising:

a P2P zone manager for determining a channel count within a P2P zone adaptively to a currently set P2P connection count; and

a scheduler for variably assigning a P2P zone to a frame duration according to the determined channel count.

22. The apparatus of claim 21, wherein the P2P zone manager:

increases a P2P connection count whenever a P2P connection is set and decreases the P2P connection count whenever the P2P connection is unset, and increases the channel count within the P2P zone whenever a channel within the P2P zone is set and decreases the channel count whenever the channel is unset;

additionally sets a channel if the channel count is less than the preset maximum channel count and is less than the P2P connection count; and

unsets a channel with no P2P connection if the P2P connection count is less than the channel count.

23. The apparatus of claim 21, wherein, if all P2P connections are unset, the scheduler unsets the assigned P2P zone.

24. The apparatus of claim 21, wherein the P2P zone comprises at least one channel, each channel comprises a broadcasting zone and a contention zone, and a P2P-mode transmit Mobile Station (MS) transmits a reference signal through a broadcasting zone of a channel to which it belongs.