Resource scheduling method, apparatus and base station

• US 9,326,290 B2
• Filed: 12/15/2011
• Issued: 04/26/2016
• Est. Priority Date: 12/16/2010
• Status: Active Grant

• Current Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Original Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Inventors: Zhu, Zhiqiu, He, Jian, Xu, Mingyu
• Primary Examiner(s): Sam, Phirin
• Application Number:
  US13/994,205
• Publication Number:
  US 20130294247A1
• Time in Patent Office: 1,594 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04W 72/52 based on load
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

Disclosed are a resource scheduling method, apparatus and base station for reducing the signaling overhead of the downlink control channel instruction in uplink and downlink data transmission. The method comprises: configuring semi-persistent scheduling parameters for a user equipment (UE) when the cell of the UE is determined to be an interference limited cell and a semi-persistent scheduling mechanism needs to be set for the UE; allocating semi-persistent scheduling resources to the UE for transmitting service data according to the semi-persistent scheduling parameters when the UE is determined to be in need of a semi-persistent scheduling mechanism for transmitting the service data of access services; sending the resource scheduling information of the semi-persistent scheduling resources to the UE over the downlink control channel of the UE. The technical solution provided in the present application reduces the signaling overhead of the downlink control channel instruction during data transmission, reduces inter-cell interference of the downlink control channel, and improves the reception capability of the downlink control channel, quality of service (QoS) and cell spectrum efficiency.

Claims

1. A resource scheduling method, comprising:

determining whether to set a semi-persistent scheduling scheme for a User Equipment, UE, upon determining a cell serving the UE as an interference limited cell with a traffic load of a downlink control channel of the interference limited cell being above a preset traffic load threshold;

configuring the UE with semi-persistent scheduling parameters upon determining the semi-persistent scheduling scheme to be set for the UE;

allocating a semi-persistent scheduling resource for transmitting service data of an access service for the UE according to the semi-persistent scheduling parameters upon determining the UE to transmit the service data in the semi-persistent scheduling scheme; and

sending resource scheduling information of the allocated semi-persistent scheduling resource to the UE on the downlink control channel of the UE.

2. The method according to claim 1, wherein determining the traffic load of the downlink control channel of the interference limited cell comprises:

determining a traffic load of the downlink control channel in the interference-limited cell in a current cycle from a traffic load of the downlink control channel in a preceding cycle, a resource utilization ratio of the downlink control channel in the current cycle and a smoothing coefficient.

3. The method according to claim 2, wherein the traffic load of the downlink control channel in the current cycle is determined in an equation of:

L_PDCCH(n)=(1−

α

)×

L_PDCCH(n-1)++×

η

_PDDCH(n),

wherein L_PDCCH(n) is the traffic load of the downlink control channel in the current cycle, L_PDCCH(n-1) is the traffic load of the downlink control channel in the preceding cycle, η

_PDCCH(n) the resource utilization ratio of the downlink control channel in the current cycle, and α

is the smoothing coefficient.

4. The method according to claim 1, wherein the determining whether to set the semi-persistent scheduling scheme for the UE comprises:

if at least one Guaranteed Bit Rate, GBR, service among current access services of the UE is determined, determining the semi-persistent scheduling scheme to be set for the UE;

otherwise, determining the semi-persistent scheduling scheme not to be set for the UE;

or

determining the semi-persistent scheduling scheme to be set for the UE according to a preset strategy that the semi-persistent scheduling scheme shall be set for all UEs in the interference-limited cell by default.

5. The method according to claim 4, wherein the semi-persistent scheduling parameters comprise semi-persistent scheduling resource intervals, and the configuring the UE with the semi-persistent scheduling parameters comprises:

configuring the UE with the semi-persistent scheduling resource intervals according to a Quality of Service, QoS, and an arrival characteristic of a service data packet of the access service.

6. The method according to claim 5, wherein when service data of a plurality of access services of the UE needs to be transmitted in the semi-persistent scheduling scheme, the configuring the UE with the semi-persistent scheduling parameters comprises:

configuring semi-persistent scheduling resource intervals corresponding to each of the access services according to a QoS and an arrival characteristic of a service data packet of the access service; and

configuring the semi-persistent scheduling resource intervals of the UE as smallest ones of semi-persistent scheduling resource intervals corresponding to the plurality of access services.

7. The method according to claim 1, wherein the semi-persistent scheduling parameters comprise semi-persistent scheduling resource intervals, and the allocating the semi-persistent scheduling resource for transmitting the service data for the UE according to the semi-persistent scheduling parameters comprises:

determining an amount of data, a Transmission Block, TB, size, to be borne on the allocated resource from an arrival characteristic of a service data packet of the current access service of the UE and the semi-persistent scheduling resource intervals among the semi-persistent scheduling parameters;

determining a Modulation and Coding Scheme, MCS, level supported by the UE from a channel condition of the UE; and

determining a number of Physical Resource Blocks, PRBs, for transmitting the service data from the TB size and the MCS level, and allocating the corresponding number of PRBs.

8. The method according to claim 1, wherein after the resource scheduling information of the allocated semi-persistent scheduling resource is sent to the UE, the method further comprises:

determining a QoS of the current access service of the UE from a time of arrival of a service data packet and an amount of data of the access service, and a data bearing capacity of the allocated semi-persistent scheduling resource; and

allocating a dynamic scheduling resource for a part of the service data of the access service and transmitting the part of the service data on the allocated dynamic scheduling resource in a dynamic scheduling scheme when the QoS is below a preset QoS threshold.

9. The method according to claim 1, wherein after the resource scheduling information of the allocated semi-persistent scheduling resource is sent to the UE, the method further comprises:

allocating a dynamic scheduling resource for a part of the service data of the access service and transmitting the part of the service data on the allocated dynamic scheduling resource in a dynamic scheduling scheme when a length of time t for which the service data, of the UE, for which the semi-persistent scheduling resource has been allocated waits for scheduling in a buffer area is above a preset delay τ

₁.

10. A resource scheduling apparatus, comprising:

a semi-persistent scheduling determining unit configured to determine whether to set a semi-persistent scheduling scheme for a User Equipment, UE, upon determining a cell serving the UE as an interference limited cell with a traffic load of a downlink control channel of the interference limited cell being above a preset traffic load threshold;

a semi-persistent scheduling parameter configuring unit configured to configure the UE with semi-persistent scheduling parameters when the semi-persistent scheduling determining unit determines the semi-persistent scheduling scheme to be set for the UE;

a semi-persistent scheduling resource allocating unit configured to allocate a semi-persistent scheduling resource for transmitting service data of an access service for the UE according to the semi-persistent scheduling parameters configured for the UE by the semi-persistent scheduling parameter configuring unit when the UE is determined to transmit the service data in the semi-persistent scheduling scheme; and

a semi-persistent scheduling resource notifying unit configured to send resource scheduling information of the semi-persistent scheduling resource, for transmitting the service data, allocated for the UE by the semi-persistent scheduling resource allocating unit to the UE on the downlink control channel of the UE.

11. The apparatus according to claim 10, further comprising:

a downlink control channel load determining unit configured to determine a traffic load of the downlink control channel in the interference-limited cell in a current cycle from a traffic load of the downlink control channel in a preceding cycle, a resource utilization ratio of the downlink control channel in the current cycle and a smoothing coefficient.

12. The apparatus according to claim 10, wherein the semi-persistent scheduling determining unit is further configured to determine the semi-persistent scheduling scheme to be set for the UE if at least one Guaranteed Bit Rate, GBR, service among current access services of the UE is determined, and otherwise, determine the semi-persistent scheduling scheme not to be set for the UE;

or to determine the semi-persistent scheduling scheme to be set for the UE according to a preset strategy that the semi-persistent scheduling scheme shall be set for all UEs in the interference-limited cell by default.

13. The apparatus according to claim 12, wherein the semi-persistent scheduling parameters comprise semi-persistent scheduling resource intervals;

and

the semi-persistent scheduling parameter configuring unit is further configured to configure the UE with the semi-persistent scheduling resource intervals according to a Quality of Service, QoS, and an arrival characteristic of a service data packet of the access service.

14. The apparatus according to claim 13, wherein when service data of a plurality of access services of the UE needs to be transmitted in the semi-persistent scheduling scheme, the semi-persistent scheduling parameter configuring unit is further configured:

to configure semi-persistent scheduling resource intervals corresponding to each of the access services according to a QoS and an arrival characteristic of a service data packet of the access service; and

to configure the semi-persistent scheduling resource intervals of the UE as smallest ones of semi-persistent scheduling resource intervals corresponding to the plurality of access services.

15. The apparatus according to claim 10, wherein the semi-persistent scheduling parameters comprise semi-persistent scheduling resource intervals, and the semi-persistent scheduling resource allocating unit is further configured:

to determine an amount of data, a Transmission Block, TB, size, to be borne on the allocated resource from an arrival characteristic of a service data packet of the current access service of the UE and the semi-persistent scheduling resource intervals among the semi-persistent scheduling parameters;

to determine a Modulation and Coding Scheme, MCS, level supported by the UE from a channel condition of the UE; and

to determine a number of Physical Resource Blocks, PRBs, for transmitting the service data from the TB size and the MCS level, and to allocate the corresponding number of PRBs.

16. The apparatus according to claim 10, further comprising:

a quality of service determining unit configured to determine a QoS of the current access service of the UE from a time of arrival of a service data packet and an amount of data of the access service, and a data bearing capacity of the allocated semi-persistent scheduling resource; and

a dynamic scheduling resource allocating unit configured to allocate a dynamic scheduling resource for a part of the service data of the access service and to transmit the part of the service data on the allocated dynamic scheduling resource in a dynamic scheduling scheme when the QoS determined by the quality of service determining unit is below a preset QoS threshold.

17. The apparatus according to claim 10, further comprising:

a dynamic scheduling resource allocating unit configured to allocate a dynamic scheduling resource for a part of the service data of the access service and to transmit the part of the service data on the allocated dynamic scheduling resource in a dynamic scheduling scheme when a length of time t for which the service data, of the UE, for which the semi-persistent scheduling resource has been allocated waits for scheduling in a buffer area is above a preset delay τ

₁.

18. An eNB, comprising the apparatus according to claim 10.