Dynamic adjustment of uplink coordinated multipoint service

• US 10,149,125 B1
• Filed: 04/10/2015
• Issued: 12/04/2018
• Est. Priority Date: 04/10/2015
• Status: Active Grant

• Current Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Original Assignee: Sprint Spectrum LP (Deutsche Telekom AG)
• Inventors: Oroskar, Siddharth S., Singh, Jasinder P.
• Primary Examiner(s): Clawson, Stephen J
• Application Number:
  US14/684,287
• Time in Patent Office: 1,334 Days
• Field of Search: 370329
• 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 7/0404 the mobile station comprising multiple antennas, e.g. to provide uplink diversity
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04W 4/18 Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
• CPC Class Codes: H04W 8/18 Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data

Abstract

Coordinated multipoint (CoMP) can improve uplink service in cellular networks. However, uplink CoMP can also burden an access network, such as by increasing processing loads at base stations and/or increasing traffic on backhaul links between base stations. Accordingly, exemplary methods and systems help to dynamically select an uplink CoMP mode for a user equipment (UE) based on various factors, such as whether the UE is located at a border cell, whether or not carrier aggregation is being utilized for downlink communications with the UE, and/or whether or not the UE is a heavy data user, among other possible factors.

Claims

1. A method comprising:

determining, by a first base station, a carrier-aggregation status corresponding to a user equipment (UE) that is operating in a coverage area of the base station;

based at least in part on the carrier-aggregation status corresponding to the UE, the first base station selecting an uplink coordinated multipoint (CoMP) mode from a plurality of uplink CoMP modes; and

receiving, by the first base station, an uplink communication from the UE according to the selected uplink CoMP mode;

wherein determining the carrier-aggregation status comprises determining whether or not carrier aggregation is applicable for downlink communications with the UE, and wherein selecting the uplink CoMP mode from the plurality of uplink CoMP mode comprises;

if it is determined that carrier aggregation is not applicable for downlink communications with the UE, then disabling uplink CoMP; and

if it is determined that carrier aggregation is applicable for downlink communications with the UE, then;

(i) determining a total number of carriers that are applicable for carrier aggregation service with the UE, and (ii) using the total number of carriers as a basis for selecting the uplink CoMP mode from the plurality of uplink CoMP modes.

2. The method of claim 1, wherein the first base station comprises an eNodeB in a Long Term Evolution (LTE) network.

3. The method of claim 1, wherein determining the carrier-aggregation status comprises determining whether or not carrier aggregation is applicable to the UE.

4. The method of claim 3, wherein determining the carrier-aggregation status comprises at least one of:

(a) determining whether or not carrier aggregation is being utilized for downlink communications with the UE and (b) determining whether or not the UE is configured for carrier-aggregation service.

5. The method of claim 3, wherein selecting the uplink CoMP mode from the plurality of uplink CoMP modes comprises:

if the carrier-aggregation status indicates that carrier aggregation is applicable to the UE, then enabling uplink CoMP for uplink communications with the UE; and

otherwise, if the carrier-aggregation status indicates that carrier aggregation is not applicable to the UE, then disabling uplink CoMP for uplink communication with the UE.

6. The method of claim 3, wherein the first base station is in an uplink CoMP cluster with one or more second base stations, and wherein selecting the uplink CoMP mode from the plurality of uplink CoMP modes comprises:

if it is determined that carrier aggregation is not applicable for downlink communications with the UE, then disabling uplink CoMP; and

if it is determined that carrier aggregation is applicable for downlink communications with the UE, then selecting an uplink CoMP mode in which the first base station shares acknowledgement (ACK) messages from the UE with at least one second base station in the uplink CoMP group.

7. The method of claim 3, wherein selecting the uplink CoMP mode from the plurality of uplink CoMP modes comprises:

if it is determined that carrier aggregation is not applicable for downlink communications with the UE, then disabling uplink CoMP; and

if it is determined that carrier aggregation is applicable for downlink communications with the UE, then;

(i) determining, by a first base station, a central processing unit (CPU) load of a second base station, wherein the first base station and the second base station provide service in a radio access network; and

(ii) using the CPU load of the second base station as a further basis for selecting the uplink CoMP mode from the plurality of uplink CoMP modes.

8. The method of claim 7:

wherein the first CoMP mode comprises centralized joint processing; and

wherein the second CoMP mode comprises decentralized joint processing.

9. The method of claim 1, further comprising:

determining, by the first base station, a data-usage class that is associated with the UE, wherein the data-usage class is one of a plurality of pre-defined data-usage classes;

the first base station using the combination of the determined data-usage class and the carrier-aggregation status as a basis for selecting the uplink CoMP mode from the plurality of uplink CoMP modes.

10. The method of claim 1, further comprising:

determining, by the first base station, a time-division duplex (TDD) frame configuration that is implemented in the coverage area in which the UE is operating; and

the first base station using the combination of the determined TDD frame configuration and the carrier-aggregation status as a basis for selecting the uplink CoMP mode from the plurality of uplink CoMP modes.

11. The method of claim 1, wherein using the total number of carriers as a basis for selecting the uplink CoMP mode comprises:

if the total number of carriers is less than or equal to a threshold number, then selecting a first CoMP mode for uplink communications with the UE; and

if the total number of carriers is greater than the threshold number, then selecting a second CoMP mode for uplink communications with the UE.

12. The method of claim 1, wherein the first CoMP mode and the second CoMP mode both involve joint reception, and wherein the first CoMP mode utilizes less resources, as compared to the second CoMP mode on an a communication link between the first base station and one or more second base stations in a cluster providing uplink CoMP service to the UE.

13. The method of claim 1, further comprising conditioning the method of claim 1 upon a determination that the UE is located in a border coverage area.

14. A method comprising:

determining, by a first base station, a data-usage class that is associated with a user equipment (UE), wherein the data-usage class is one of a plurality of pre-defined data-usage classes comprising at least a first data-usage class that indicates that a corresponding user account has a standard data-usage level and a second data-usage class that indicates that a corresponding user account has a heavy data-usage level;

based at least in part on the associated data-usage class, the first base station selecting an uplink coordinated multipoint (CoMP) mode from a plurality of uplink CoMP modes; and

receiving, by the first base station, an uplink communication from the UE according to the selected uplink CoMP mode.

15. The method of claim 14, wherein a given user account is assigned to the first data-usage class if data usage associated with the given user account is below a threshold level, and wherein the given user account is assigned to the second data-usage class if data usage associated with the given user account is above a threshold level.

16. The method of claim 14, wherein the first data-usage class comprises UEs that are assigned QCI 9, and wherein the second data-usage class comprises UEs that are assigned QCI 8.

17. The method of claim 14, further comprising:

determining, by the first base station, a time-division duplex (TDD) frame configuration that is implemented in the coverage area in which the UE is operating; and

the first base station using the combination of the determined TDD frame configuration and the determined data-usage class as a basis for selecting the uplink CoMP mode from the plurality of uplink CoMP modes.

18. A network component comprising:

one or more communication interfaces configured for uplink and downlink communication with a user equipment (UE) that operates in a coverage area of the base station;

at least one processor; and

a non-transitory computer readable medium comprising program instructions stored thereon that are executable by the at least one processor to;

(a) determine a carrier-aggregation status corresponding to the UE;

(b) based at least in part on the carrier-aggregation status corresponding to the UE, select an uplink coordinated multipoint (CoMP) mode from a plurality of uplink CoMP modes; and

(c) receive, via at least one of the communication interfaces, an uplink communication from the UE according to the selected uplink CoMP mode

wherein determination of the carrier-aggregation status comprises a determination of whether or not carrier aggregation is applicable for downlink communications with the UE, and wherein selection of the uplink CoMP mode from the plurality of uplink CoMP mode comprises;

if it is determined that carrier aggregation is not applicable for downlink communications with the UE, then disabling uplink CoMP, and

if it is determined that carrier aggregation is applicable for downlink communications with the UE, then;

(i) determining a total number of carriers that are applicable for carrier aggregation service with the UE, and (ii) using the total number of carriers as a basis for selecting the uplink CoMP mode from the plurality of uplink CoMP modes.

19. A network component comprising:

one or more communication interfaces configured for uplink and downlink communication with a user equipment (UE) that operates in a coverage area of the base station;

at least one processor; and

a non-transitory computer readable medium comprising program instructions stored thereon that are executable by the at least one processor to;

(a) determine a data-usage class that is associated with the UE, wherein the data-usage class is one of a plurality of pre-defined data-usage classes that indicate levels of data usage, wherein the plurality of pre-defined data-usage classes comprises at least a first data-usage class that indicates that a corresponding user account has a standard data-usage level and a second data-usage class that indicates that a corresponding user account has a heavy data-usage level;

(b) based at least in part on the associated data-usage class, select an uplink coordinated multipoint (CoMP) mode from a plurality of uplink CoMP modes; and

(c) receive an uplink communication from the UE according to the selected uplink CoMP mode.