Method and Apparatus for Multi-Radio Coexistence on Adjacent Frequency Bands

• US 20120257519A1
• Filed: 04/08/2011
• Published: 10/11/2012
• Est. Priority Date: 04/08/2011
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola Mobility, Inc. (Lenovo Group Ltd.)
• Inventors: Frank, Colin D., Krishnamurthy, Sandeep H., Love, Robert T., Nimbalker, Ajit, Nory, Ravikiran, Stewart, Kenneth A.
• Granted Patent: US 8,724,492 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0062 Avoidance of ingress interference, e.g. ham radio channels
• CPC Class Codes: H04L 5/143 for modulated signals H04L5/1469 takes precedence
• CPC Class Codes: H04W 4/023 using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 72/02 Selection of wireless resources by user or terminal
• CPC Class Codes: H04W 72/1268 of uplink data flows
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 74/00 Wireless channel access
• CPC Class Codes: H04W 92/20 between access points
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and apparatus for a co-scheduler can mitigate UE-to-UE adjacent carrier frequency band interference by allocating three sets to a first user equipment uplink. Each set has at least one sub-carrier in a first frequency band, at least one uplink time period, and at least one transmission power parameter. The co-scheduler initially allocates the first set. The co-scheduler allocates the second set in response to detecting a second user equipment operating proximal to the first user equipment, and the second set differs from the first set in either at least one sub-carrier or at least one transmission power parameter. The co-scheduler allocates the third set in response to detecting that the second user equipment is no longer operating proximal to the first user equipment, and the third set differs from the second set in either at least one sub-carrier or at least one transmission power parameter.

Claims

1. A method for a co-scheduler comprising:

allocating, to a first user equipment uplink, a first set having at least one sub-carrier in a first frequency band, at least one uplink time period, and at least one transmission power parameter;

detecting a second user equipment operating proximal to the first user equipment;

in response to the detecting, allocating, to the first user equipment uplink, a second set having at least one sub-carrier in the first frequency band, at least one uplink time period, and at least one transmission power parameter, wherein the second set differs from the first set in either the at least one sub-carrier or the at least one transmission power parameter;

determining that the second user equipment is no longer operating proximal to the first user equipment; and

in response to the determining, allocating, to the first user equipment uplink, a third set having at least one sub-carrier in the first frequency band, at least one uplink time period, and at least one transmission power parameter, wherein the third set differs from the second set in either the at least one sub-carrier or the at least one transmission power parameter.

2. A method according to claim 1 wherein the detecting comprises:

receiving first location information of a first user equipment from a first base station serving the first user equipment; and

receiving second location information of a second user equipment from a second base station serving the second user equipment.

3. A method according to claim 2 wherein the first base station operates in a first wireless network on the first frequency band and the second base station operates in a second wireless network on a second frequency band.

4. A method according to claim 2 wherein a first radio access technology employed by the first base station is different from a second radio access technology employed by the second base station.

5. A method according to claim 1 wherein the second set differs from the first set in the at least one sub-carrier and wherein the allocating a second set comprises:

allocating a particular sub-carrier that was part of the first set and not part of the second set during the at least one uplink time period of the second set to a third user equipment that is not operating proximal to the first user equipment.

6. A method according to claim 1 wherein the second set differs from the first set in the at least one sub-carrier and a particular sub-carrier that was part of the first set and not part of the second set is near an edge of the first frequency band.

7. A method according to claim 1 wherein the second set differs from the first set in the at least one subcarrier, and a particular sub-carrier that was part of the first set and not part of the second set includes all sub-carriers in the first frequency band.

8. A method according to claim 1 wherein the detecting comprises:

identifying the second user equipment as scheduled to receive in a second frequency band during the at least one uplink time period of the second set.

9. A method according to claim 8 wherein the at least one time period of the second set is a portion of an orthogonal frequency division multiple access (OFDMA) subframe.

10. A method according to claim 9 wherein the at least one time period of the second set is a complete OFDMA subframe.

11. A method according to claim 1 wherein the detecting comprises:

identifying the second user equipment as scheduled for channel measurements in a second frequency band during at least a portion of the at least one time period of the second set.

12. A method according to claim 1 wherein the allocating a first set comprises:

sending a semi-persistent uplink grant to the first user equipment.

13. A method according to claim 12 wherein the allocating a second set comprises:

instructing the first user equipment to not transmit on a particular semi-persistent uplink subframe.

14. A method according to claim 12 wherein the allocating a first set further comprises:

transmitting a schedule indicating a measurement time period when the second user equipment may take channel measurements in a second frequency band.

15. A method according to claim 14 wherein the allocating a first set further comprises:

instructing the first user equipment to not transmit on a particular semi-persistent uplink subframe that overlaps with the measurement time period.

16. A method according to claim 1 wherein the second user equipment is collocated with the first user equipment.

17. A method according to claim 1 further comprising:

predicting a potential conflict between a second user equipment transmission and a control signal reception at the first user equipment, wherein the control signal contains an uplink transmission grant for the first user equipment.

18. A method according to claim 17 further comprising:

recommending a scheduling delay index for the control signal.

19. A method according to claim 1 wherein the at least one transmission power parameter of the first set includes one of:

an open loop power offset value, a fractional power control coefficient, a power control delta, or a Maximum Power Reduction (MPR) value.

20. A method according to claim 19 wherein the at least one transmission power parameter of the second set includes a power offset value to the at least one transmission power parameter of the first set.

21. A co-scheduler comprising:

a proximal interference assessor for receiving first user equipment location information from a first user equipment operating in a first frequency band and for receiving second user equipment location information from a second user equipment operating in a second frequency band adjacent to the first frequency band and determining whether the first user equipment is proximal to the second user equipment; and

a time-frequency-power wireless resource allocator, coupled to the proximal interference assessor, for assigning first user equipment uplink resources and power levels as well as second user equipment downlink resources.

22. A co-scheduler in accordance with claim 21 wherein the first user equipment uplink resources do not overlap in frequency with the second user equipment downlink resources.

23. A co-scheduler in accordance with claim 21 wherein the time-frequency-power wireless resource allocator sends the first user equipment uplink resource assignment to the first user equipment'"'"'s serving base station and sends the second user equipment downlink resource assignment to the second user equipment'"'"'s serving base station.

24. A co-scheduler in accordance with claim 21 wherein the time-frequency-power wireless resource allocator sends the second user equipment uplink resource assignment to the first user equipment'"'"'s serving base station.

25. A co-scheduler in accordance with claim 21 wherein a first radio access technology employed by the first user equipment'"'"'s serving base station is different from a second radio access technology employed by the second user equipment'"'"'s serving base station.

26-48. -48. (canceled)