DETERMINING A CLUSTER SET OF MOBILE DEVICES

• US 20140177461A1
• Filed: 02/05/2013
• Published: 06/26/2014
• Est. Priority Date: 12/21/2012
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Boudreau, Gary D., Seyedmehdi, Seyed Hossein
• Granted Patent: US 9,301,308 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/026 Co-operative diversity, e.g. using fixed or mobile stations as relays
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04W 52/0212 managed by the network, e.g. network or access point is master and terminal is slave
• CPC Class Codes: H04W 52/48 during retransmission after error or non-acknowledgment
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: H04W 88/12 Access point controller devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Mechanisms for determining a cluster set of mobile devices are disclosed. A controller node identifies a primary mobile device that has a scheduled transmission for the controller node at a first time. The controller node identifies, from a plurality of mobile devices, a set of eligible assistant (EA) mobile devices. Each EA mobile device in the set is directed to determine a corresponding mobile device-to-mobile device (MD-MD) channel indicator that identifies a quality of a channel between the each EA mobile device and the primary mobile device. The controller node receives from at least one EA mobile device in the set the corresponding MD-MD channel indicator. The controller node then determines a cluster set that includes the primary mobile device and the at least one EA mobile device.

Claims

1. A method for determining a cluster set of mobile devices comprising:

identifying, by a controller node, a primary mobile device that has a scheduled transmission for the controller node at a first time;

identifying, by the controller node, a set of eligible assistant (EA) mobile devices from a plurality of mobile devices;

directing each EA mobile device in the set to determine a corresponding mobile device-to-mobile (MD-MD) device channel indicator that identifies a quality of a channel between the each EA mobile device and the primary mobile device;

receiving from at least one EA mobile device in the set the corresponding MD-MD channel indicator; and

determining a cluster set that includes the primary mobile device and the at least one EA mobile device.

2. The method of claim 1, wherein each EA mobile device in the set is identified based on the each EA mobile device being unscheduled for transmission at the first time.

3. The method of claim 1, wherein identifying, by the controller node, the set of EA mobile devices from the plurality of mobile devices comprises receiving, from each EA mobile device in the set, an eligibility indicator that indicates the each EA mobile device is eligible to assist the primary mobile device.

4. The method of claim 1 further comprising:

directing each EA mobile device in the cluster set to receive the scheduled transmission and to retransmit the scheduled transmission to the controller node.

5. The method of claim 4 further comprising:

directing a receive beam in a direction toward the at least one EA mobile device;

directing the at least one EA mobile device to retransmit the scheduled transmission using a lower power level than a power level previously used by the at least one EA mobile device.

6. The method of claim 4 further comprising:

sending each EA mobile device in the cluster set a precoding matrix to apply to the retransmission of the scheduled transmission.

7. The method of claim 1 further comprising:

receiving the scheduled transmission from the primary mobile device; and

receiving a retransmitted scheduled transmission from each EA mobile device in the cluster set.

8. The method of claim 7 further comprising:

combining the scheduled transmission and the retransmitted scheduled transmissions received from each EA mobile device in the cluster set to generate a combined scheduled transmission; and

processing the combined scheduled transmission.

9. The method of claim 1 further comprising:

based at least in part on the determination of the cluster set, sending the primary mobile device a new modulation and coding scheme (MCS) having a higher data rate for use in a subsequent transmission than a previous MCS used by the primary mobile device in an immediately previous transmission.

10. The method of claim 1 wherein receiving from the at least one of the EA mobile devices the corresponding MD-MD channel indicator comprises receiving from a plurality of EA mobile devices in the set a corresponding MD-MD channel indicator, and wherein determining the cluster set comprises:

sorting the plurality of EA mobile devices based at least in part on the corresponding MD-MD channel indicators to generate a sorted list of the EA mobile devices; and

determining the cluster set to include a subset of the EA mobile devices from the plurality of EA mobile devices based at least in part on the sorted list.

11. The method of claim 10 further comprising:

determining, for each EA mobile device in the plurality of EA mobile devices, a corresponding mobile device-to-controller node (MD-CN) channel indicator that identifies a quality of a channel between the each EA mobile device and the controller node; and

wherein sorting the plurality of EA mobile devices based at least in part on the MD-MD channel indicator to generate the sorted list of the EA mobile devices comprises;

sorting the plurality of EA mobile devices based at least in part on the corresponding MD-MD channel indicators and the corresponding MD-CN channel indicators to generate the sorted list of the EA mobile devices.

12. The method of claim 10 further comprising:

receiving, by the controller node, interference information from a neighboring controller node that identifies an interference level associated with one or more of the EA mobile devices, and

wherein sorting the plurality of EA mobile devices based at least in part on the MD-MD channel indicators to generate the sorted list of the EA mobile devices comprises;

sorting the plurality of EA mobile devices based at least in part on the corresponding MD-MD channel indicators and the interference information to generate the sorted list of the EA mobile devices.

13. The method of claim 1 wherein receiving from the at least one of the EA mobile devices the corresponding MD-MD channel indicator comprises receiving from a plurality of the EA mobile devices in the set a corresponding MD-MD channel indicator, and further comprising:

determining, for each EA mobile device in the plurality of EA mobile devices, a corresponding mobile device-to-controller node (MD-CN) channel indicator that identifies a quality of a channel between the each EA mobile device and the controller node; and

wherein determining the cluster set comprises;

sorting the plurality of EA mobile devices based at least in part on the corresponding MD-CN channel indicators to generate the sorted list of the EA mobile devices; and

determining the cluster set to include a subset of the EA mobile devices from the plurality of EA mobile devices based at least in part on the sorted list.

14. The method of claim 1, wherein determining the cluster set that includes the primary mobile device and the at least one EA mobile device comprises:

sending, to a central controller node, the corresponding MD-MD channel indicator, an identification of the at least one EA mobile device, and an identification of the primary mobile device; and

receiving, from the central controller node, the cluster set.

15. A method for providing a channel indicator to a controller node comprising:

receiving, by an eligible assistant (EA) mobile device from a controller node, a request to determine a mobile device-to-mobile device (MD-MD) channel indicator that identifies a quality of a channel between the EA mobile device and a primary mobile device;

in response to the request, listening to a transmission from the primary mobile device;

determining the MD-MD channel indicator based on the transmission; and

sending the MD-MD channel indicator to the controller node.

16. The method of claim 15 further comprising:

receiving, from the controller node, a request to retransmit a scheduled transmission from the primary mobile device to the controller node.

17. The method of claim 16 further comprising:

receiving, from the primary mobile device the scheduled transmission; and

transmitting the scheduled transmission to the controller node.

18. The method of claim 15 further comprising:

determining that a link rate between the EA mobile device and the primary mobile device complies with a threshold channel indicator; and

based on the determination, determining the MD-MD channel indicator based on the transmission, and sending the MD-MD channel indicator to the controller node.

19. The method of claim 18, wherein the threshold channel indicator is based on a link rate between the primary mobile device and the controller node.

20. A method for determining a cluster set of mobile devices, comprising:

receiving, from each controller node of a plurality of controller nodes, cluster determination information that identifies at least one primary mobile device that has a scheduled transmission for the each controller node at a scheduled time, and at least one eligible assistant (EA) mobile device that is unscheduled for transmission at the scheduled time;

determining a system performance metric;

forming cluster sets based on the system performance metric, each cluster set identifying a primary mobile device and at least one EA mobile device; and

sending cluster information to the plurality of controller nodes that identifies the cluster sets.

21. The method of claim 20, wherein the system performance metric comprises an average throughput of the identified at least one primary mobile devices.

22. The method of claim 20, wherein the system performance metric comprises a harmonic mean of the identified at least one primary mobile devices.

23. The method of claim 20, wherein the cluster determination information comprises mobile device-to-controller node channel indicators identifying a quality of a channel between the each controller node and the at least one EA mobile device and mobile device-to-mobile device channel indicators identifying a quality of a channel between the at least one EA mobile device and the at least one primary mobile device.

24. A controller node comprising:

a communications interface configured to communicate with a plurality of mobile devices; and

a controller comprising a processor and coupled to the communications interface, the controller configured to;

identify a primary mobile device that has a scheduled transmission for the controller node at a first time;

identify, from a plurality of mobile devices, a set of eligible assistant (EA) mobile devices from a plurality of mobile devices;

direct each EA mobile device in the set to determine a corresponding mobile device-to-mobile device channel indicator that identifies a quality of a channel between the each EA mobile device and the primary mobile device;

receive from at least one EA mobile device in the set the corresponding mobile device-to-mobile device channel indicator; and

determine a cluster set that includes the primary mobile device and the at least one EA mobile device.

25. An eligible assistant mobile device comprising:

a communications interface configured to communicate with a controller node; and

a controller comprising a processor and coupled to the communications interface, the controller configured to;

receive, from the controller node, a request to determine a mobile device-to-mobile device (MD-MD) channel indicator that identifies a quality of a channel between the EA mobile device and a primary mobile device;

in response to the request, listen to a transmission from the primary mobile device;

determine the MD-MD channel indicator based on the transmission; and

send the MD-MD channel indicator to the controller node.