Configuring radio resource allocation and scheduling mobile station mechanism for frequency reuse in cellular OFDMA systems

• US 20090047971A1
• Filed: 10/15/2008
• Published: 02/19/2009
• Est. Priority Date: 10/16/2007
• Status: Active Grant

• Current Assignee: HFI Innovation, Inc. (MediaTek, Inc.)
• Original Assignee: MediaTek, Inc.
• Inventors: Fu, I-Kang
• Granted Patent: US 8,351,949 B2
• Time in Patent Office: Days
• US Class Current: 455/450
• CPC Class Codes: H04W 16/12 Fixed resource partitioning
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

Under adaptive frequency reuse technique, mobile stations in a cellular orthogonal frequency division multiple access (OFDMA) system are served by different radio resource regions with appropriate frequency reuse patterns to mitigate inter-cell interference and improve system capacity. In a first novel aspect, the mobile stations measure interference statistics and obtain interference measurement results. The mobile stations report the obtained interference measurement results to serving base stations. The serving base stations determine adaptive frequency reuse patterns based on the received interference measurement result. In a second novel aspect, a radio resource control element receives the interference measurement results, determines frequency reuse patterns and configures radio resource allocation based on the received interference measurement results. In a third novel aspect, the base stations obtain the interference measurement results and schedule the mobile stations to be served with appropriate radio resource regions.

Claims

1-22. -22. (canceled)

23. A method for configuring radio resource allocation, comprising:

(a) obtaining interference measurement results of mobile stations located in cells of a cellular orthogonal frequency division multiple access (OFDMA) system; and

(b) determining frequency reuse patterns and configuring corresponding radio resource allocation based at least in part on the interference measurement results.

24. The method of claim 23, wherein a frame of each cell is divided into a number of radio resource regions, and wherein each mobile station is served by a corresponding radio resource region having a corresponding frequency reuse pattern.

25. The method of claim 23, wherein frequency reuse patterns are determined in (b) such that received interference power of the mobile stations are compared with a predetermined threshold value.

26. The method of claim 23, wherein frequency reuse patterns are determined in (b) such that received signal to interference-plus-noise ratios (SINRs) of the mobile stations are compared with a predetermined threshold ratio.

27. The method of claim 24, wherein the determining of frequency reuse patterns in (b) involves determining the number and the size of radio resource regions for each cell and frequency reuse factor for each radio resource region.

28. The method of claim 24, wherein the determining of frequency reuse patterns in (b) involves defining and synchronizing time-frequency regions to be used in each radio resource region among neighboring cells.

29. The method of claim 24, wherein the configuring radio resource allocation in (b) involves determining transmit power of each radio resource region.

30. The method of claim 24, wherein the configuring radio resource allocation in (b) involves determining antenna configuration of each radio resource region.

31. The method of claim 24, wherein the configuring radio resource allocation in (b) involves determining channelization format of each radio resource region.

32. The method of claim 23, wherein the determining and configuring in (b) is performed by a centralized radio resource control element of the cellular OFDMA system.

33. The method of claim 23, wherein the determining and configuring in (b) is performed through coordination among neighboring base stations of the cellular OFDMA system.

34. A cellular orthogonal frequency division multiple access (OFDMA) system, comprising:

a plurality of mobile stations that measures interference statistics and thereby obtains interference measurement results; and

a network element that receives the interference measurement results, wherein the network element determines frequency reuse patterns and configures corresponding radio resource allocation based at least in part on the received interference measurement results.

35. The OFDMA system of claim 34, wherein the network element is a centralized radio resource control element of the OFDMA system.

36. The OFDMA system of claim 34, wherein the plurality of mobile stations is served by a serving base station, and wherein the serving base station includes the network element that receives the interference measurement results and determines frequency reuse patterns.

37. The OFDMA system of claim 34, wherein the plurality of mobile stations is served by a plurality of serving base stations, and wherein each one of the plurality of serving base stations receives the interference measurement results and determines frequency reuse patterns through coordination among neighboring base stations.

38. A method for scheduling a mobile station, comprising:

(a) obtaining an interference measurement result by a base station in a cellular orthogonal frequency division multiple access (OFDMA) system; and

(b) scheduling the mobile station to be served by a radio resource region based at least in part on the obtained interference measurement result.

39. The method of claim 38, wherein the mobile station is located in a cell divided into a number of radio resource regions, and wherein each radio resource region is applied with a corresponding frequency reuse pattern.

40. The method of claim 38, wherein the obtaining in (a) involves receiving the interference measurement result from the mobile station.

41. The method of claim 38, wherein the obtaining in (a) involves measuring an interference statistic by the base station and thereby obtaining the interference measurement result.

42. The method of claim 38, wherein the scheduling in (b) involves scheduling the mobile station to be served by the radio resource region such that a received interference power of the mobile station is lower than a predetermined threshold value.

43. The method of claim 38, wherein the scheduling in (b) involves scheduling the mobile station to be served by the radio resource region such that a received signal to interference-plus-noise ratio (SINR) of the mobile station is higher than a predetermined threshold ratio.

44. The method of claim 38, further comprising:

(c) instructing a mobile station to measure an interference statistic over a designated time-frequency region, wherein the serving base station does not transmit signal over the designated time-frequency region.

45. The method of claim 38, further comprising:

(c) communicating the interference measurement result to neighboring base stations of the cellular OFDMA system.

46. A cellular orthogonal frequency division multiple access (OFDMA) system, comprising:

a mobile station; and

a serving base station that obtains an interference measurement result and schedules the mobile station to be served by a radio resource region based at least in part on the obtained interference measurement result.

47. The OFDMA system of claim 46, wherein the mobile station measures an interference statistic and thereby obtains the interference measurement result, and where in the serving base station receives the interference measurement result from the mobile station.

48. The OFDMA system of claim 46, wherein the serving base station measures an interference statistic and thereby obtains the interference measurement result.