User equipment frequency allocation methods and apparatus

• US 8,219,092 B2
• Filed: 10/02/2006
• Issued: 07/10/2012
• Est. Priority Date: 10/02/2006
• Status: Active Grant

• Current Assignee: NXP USA, Inc. (NXP Semiconductors NV)
• Original Assignee: Freescale Semiconductor, Inc. (NXP Semiconductors NV)
• Inventors: Oteri, Oghenekome F., Aziz, Ahsan U.
• Primary Examiner(s): Appiah, Charles
• Assistant Examiner(s): HOLLIDAY, JAIME MICHELE
• Application Number:
  US11/542,512
• Publication Number:
  US 20080081633A1
• Time in Patent Office: 2,108 Days
• Field of Search: 455/452.2, 455/446, 455436-444, 455448-449
• US Class Current: 455/436
• CPC Class Codes: H04W 16/30 Special cell shapes, e.g. doughnuts or ring cells
• CPC Class Codes: H04W 72/51 based on terminal or device properties

Abstract

In an embodiment, a wireless communication system (100, FIG. 1) includes one or more nodes (102-108) and one or more user equipments (UE) (130-134). A node may service a cell (110-116). A UE may be classified (802, FIG. 8) into a cell-edge UE group when the UE is within in a cell-edge region (504, 506, 508, FIG. 5) of a cell. The cell-edge UE group may be allocated at least one first frequency range within an available bandwidth (600, 700, FIGS. 6 and 7). A UE may be reclassified (808, FIG. 8) into a cell-center UE group based on at least one indicator of UE performance. The cell-center UE group may be allocated at least one second frequency range within the available bandwidth.

Claims

1. A method for allocating frequencies to at least one user equipment (UE) in a wireless communication system that includes a system node and at least one cell, the method performed by the system node and comprising:

in response to a request for service from a UE, classifying the UE into a cell-edge UE group when the UE is within in a cell-edge region of a cell, wherein the cell-edge UE group is allocated first frequencies within an available bandwidth, and wherein the cell-edge region of the cell is physically defined by a cell-edge outer boundary and a cell-edge inner boundary, and a cell-center region of the cell is physically defined by the cell-edge inner boundary;

providing the service to the UE using one of the first frequencies allocated to the cell-edge UE group;

during provision of the service, determining that the UE is performing better than other UE that are classified in the cell-edge UE group, based on at least one indicator of UE performance;

based on the determining step, reclassifying the UE into a cell-center UE group, wherein the cell-center UE group is allocated second frequencies within the available bandwidth, wherein the second frequencies are different from the first frequencies; and

continuing to provide the service to the UE using one of the second frequencies allocated to the cell-center UE group.

2. The method of claim 1, wherein the at least one indicator of UE performance is selected from a group of indicators that includes a data throughput indicator and a signal quality indicator.

3. The method of claim 1, further comprising:

before reclassifying, determining a pre-reclassification value of a system metric; and

after reclassifying, determining a first post-reclassification value of the system metric.

4. The method of claim 3, wherein the system metric is selected from a group of metrics that includes an average Carrier-to-Interference plus Noise Ratio and an average data throughput.

5. The method of claim 3, further comprising:

reclassifying the UE back into the cell-edge UE group when a comparison of the pre-reclassification value and the first post-reclassification value indicates that the system metric has degraded.

6. The method of claim 5, further comprising:

waiting a period of time after reclassifying the UE back into the cell-edge UE group; and

reclassifying the UE or at least one other cell-edge UE into the cell-center UE group based on the at least one indicator of UE performance.

7. The method of claim 3, further comprising:

reclassifying at least one other cell-edge UE into the cell-center UE group when a comparison of the pre-reclassification value and the first post-reclassification value indicates that the system metric has not degraded.

8. The method of claim 3, further comprising:

reclassifying a cell-center UE into the cell-edge UE group based on the at least one indicator of UE performance when a comparison of the pre-reclassification value and the first post-reclassification value indicates that the system metric has degraded.

9. The method of claim 8, further comprising:

selecting the cell-center UE to be reclassified when the at least one indicator of UE performance indicates that a performance of the cell-center UE is relatively worse than performances of other cell-center group UEs.

10. The method of claim 8, further comprising:

after reclassifying the cell-center UE, determining a second post-reclassification value for the system metric; and

reclassifying at least one other cell-center UE into the cell-edge UE group when a comparison of the first post-reclassification value and the second post-reclassification value indicates that the system metric has not degraded.

11. The method of claim 1, wherein determining that the UE is performing better than other UE that are classified in the cell-edge UE group comprises determining that, of the UE and the other UE that are classified in the cell-edge UE group, the UE is performing best.

12. The method of claim 1, wherein determining that the UE is performing better than other UE that are classified in the cell-edge UE group comprises determining that the UE is performing better than average when compared to the other UE that are classified in the cell-edge UE group.

13. The method of claim 1, wherein the at least one indicator of UE performance is a data throughput indicator.

14. A method for allocating frequencies to multiple user equipments (UEs) in a wireless communication system that includes a system node and at least one cell, the method performed by the system node and comprising:

classifying first selected ones of the multiple UEs as cell-edge UEs when each of the first selected ones are located within in a cell-edge region of a cell, wherein the cell-edge UEs are allocated first frequencies within an available bandwidth, and wherein the cell-edge region of the cell is physically defined by a cell-edge outer boundary and a cell-edge inner boundary;

classifying second selected ones of the multiple UEs as cell-center UEs when each of the second selected ones are located within in a cell-center region of the cell, wherein the cell-center UEs are allocated second frequencies within the available bandwidth, wherein the second frequencies are different from the first frequencies, wherein the cell-center region of the cell is physically defined by the cell-edge inner boundary;

during provision of services to first UEs that are classified as cell-edge UEs, determining that the first UEs are performing better than other UEs that are classified as cell-edge UEs, and reclassifying the first UEs as cell-center UEs, and wherein reclassifying results in the first UEs switching from communicating using the first frequencies to communicating using the second frequencies; and

during provision of services to second UEs that are classified as cell-center UEs, determining that the second UEs are performing worse than other UEs that are classified as cell-center UEs, and reclassifying the second UEs as cell-edge UEs, and wherein reclassifying results in the second UEs switching from communicating using the second frequencies to communicating using the first frequencies.

15. The method of claim 14, wherein at least one indicator of UE performance that indicates whether a UE is performing better or worse than other UEs is selected from a group of indicators that includes a data throughput indicator and a signal quality indicator.

16. The method of claim 14, further comprising:

before reclassifying the first UEs, determining a pre-reclassification value of a system metric; and

after reclassifying the first UEs, determining a first post-reclassification value of the system metric.

17. The method of claim 16, further comprising:

reclassifying the first UEs back into cell-edge UEs when a comparison of the pre-reclassification value and the first post-reclassification value indicates that the system metric has degraded.

18. The method of claim 16, wherein the system metric is selected from a group of metrics that includes an average Carrier-to-Interference plus Noise Ratio and an average data throughput.

19. A system node to allocate frequencies to at least one user equipment (UE) in a wireless communication network that includes the system node and at least one cell, the system node comprising:

one or more integrated circuits configured

to classify, in response to a request for service from a UE, the UE into a cell-edge UE group when the UE is within in a cell-edge region of a cell, wherein the cell-edge region of the cell is physically defined by a cell-edge outer boundary and a cell-edge inner boundary, and wherein the cell-edge UE group is allocated first frequencies within an available bandwidth,

to provide the service to the UE using one of the first frequencies allocated to the cell-edge UE group,

during provision of the service, to determine that the UE is performing better than other UE that are classified in the cell-edge UE group, based on at least one indicator of UE performance,

based on the determining step, to reclassify the UE into a cell-center UE group, although the UE remains located in the cell-edge region, based on at least one indicator of UE performance, wherein the cell-center UE group is allocated second frequencies within the available bandwidth, wherein the second frequencies are different from the first frequencies, and

to continue to provide the service to the UE using one of the second frequencies allocated to the cell-center UE group.

20. The system node of claim 19, wherein the system node further comprises:

one or more air interface subsystems, operably coupled to the one or more integrated circuits, to receive uplink signals from UEs over an air interface.

21. The system node of claim 19, wherein the system node is selected from a group consisting of a system control node and a base station.