APPARATUS AND METHOD FOR RESOURCE SELECTION IN OFDMA SYSTEMS

• US 20110051676A1
• Filed: 08/02/2010
• Published: 03/03/2011
• Est. Priority Date: 08/27/2009
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Tae Young, Wu, Qi, Kang, Heewon, Josiam, Kaushik, Ramakrishna, Sudhir
• Granted Patent: US 8,861,528 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A base station for use in a wireless network that communicates with mobile stations according to the IEEE 802.16m standard. The base station transmits unicast data and E-MBS data in the downlink to mobile stations using physical resource units (PRUs) that are partitioned into a plurality of frequency partitions. The base station transmits E-MBS data using a first set of PRUs in at least a first common frequency partition, wherein the first set of PRUs are also used by at least a second base station to transmit E-MBS data. The base station further transmits unicast data using a second set of PRUs, wherein the second set of PRUs are randomized with respect to PRUs used by the at least a second base station to transmit unicast data.

Claims

1. For use in a wireless network capable of communicating with a plurality of mobile stations according to the IEEE 802.16m standard, a first base station capable of transmitting unicast data and E-MBS data in the downlink to mobile stations using physical resource units (PRUs) that are partitioned into a plurality of frequency partitions, wherein the first base station transmits E-MBS data using a first set of PRUs in at least a first common frequency partition, wherein the first set of PRUs are also used by at least a second base station to transmit E-MBS data, and wherein the first base station transmits unicast data using a second set of PRUs, wherein the second set of PRUs are randomized with respect to PRUs used by the at least a second base station to transmit unicast data.

2. The first base station as set forth in claim 1, wherein the first set of PRUs comprises at least one sub-band contiguous resource unit.

3. The first base station as set forth in claim 1, wherein the first set of PRUs is reserved for transmitting E-MBS data in all common frequency partitions of the wireless network.

4. The first base station as set forth in claim 1, wherein the first base station transmits to the mobile stations a control message that enables the mobile stations to determine how frequency partitions are arranged in the wireless network.

5. The first base station as set forth in claim 4, wherein the control message further enables the mobile stations to determine the allocation of PRUs in each frequency partition in the wireless network.

6. The first base station as set forth in claim 5, wherein the control message is transmitted in a control channel of the downlink.

7. The first base station as set forth in claim 5, wherein the control message identifies the first set of PRUs using a look-up table.

8. The first base station as set forth in claim 5, wherein the control message identifies the first set of PRUs by indexing a tree diagram.

9. A wireless network comprising:

a plurality of base stations capable of communicating with a plurality of mobile stations according to the IEEE 802.16m standard,

wherein a first base station transmits unicast data and E-MBS data in the downlink to mobile stations using physical resource units (PRUs) that are partitioned into a plurality of frequency partitions, and

wherein the first base station transmits E-MBS data using a first set of PRUs in at least a first common frequency partition, wherein the first set of PRUs are also used by at least a second base station to transmit E-MBS data, and

wherein the first base station transmits unicast data using a second set of PRUs, wherein the second set of PRUs are randomized with respect to PRUs used by the at least a second base station to transmit unicast data.

10. The wireless network as set forth in claim 9, wherein the first set of PRUs comprises at least one sub-band contiguous resource unit.

11. The wireless network as set forth in claim 9, wherein the first set of PRUs is reserved for transmitting E-MBS data in all common frequency partitions of the wireless network.

12. The wireless network as set forth in claim 9, wherein the first base station transmits to the mobile stations a control message that enables the mobile stations to determine how frequency partitions are arranged in the wireless network.

13. The wireless network as set forth in claim 12, wherein the control message further enables the mobile stations to determine the allocation of PRUs in each frequency partition in the wireless network.

14. The wireless network as set forth in claim 13, wherein the control message is transmitted in a control channel of the downlink.

15. The wireless network as set forth in claim 13, wherein the control message identifies the first set of PRUs using a look-up table.

16. The wireless network as set forth in claim 13, wherein the control message identifies the first set of PRUs by indexing a tree diagram.

17. A method of downlink transmission for use in a wireless network capable of communicating with a plurality of mobile stations according to the IEEE 802.16m standard, the method comprising the steps of:

partitioning physical resource units (PRUs) in the downlink from a first base station to mobile stations into a plurality of frequency partitions;

transmitting from the first base station E-MBS data using a first set of PRUs in at least a first common frequency partition, wherein the first set of PRUs are also used by at least a second base station to transmit E-MBS data; and

transmitting from the first base station unicast data using a second set of PRUs, wherein the second set of PRUs are randomized with respect to PRUs used by the at least a second base station to transmit unicast data.

18. The method as set forth in claim 17, wherein the first set of PRUs comprises at least one sub-band contiguous resource unit.

19. The method as set forth in claim 17, wherein the first set of PRUs is reserved for transmitting E-MBS data in all common frequency partitions of the wireless network.

20. The method as set forth in claim 17, further comprising the step of transmitting from the first base station a control message that enables the mobile stations to determine how frequency partitions are arranged in the wireless network.

21. The method as set forth in claim 20, wherein the control message further enables the mobile stations to determine the allocation of PRUs in each frequency partition in the wireless network.

22. The method as set forth in claim 21, wherein the control message is transmitted in a control channel of the downlink.

23. The method as set forth in claim 21, wherein the control message identifies the first set of PRUs using a look-up table.

24. The method as set forth in claim 21, wherein the control message identifies the first set of PRUs by indexing a tree diagram.