System and method to facilitate subframe scheduling in a split medium access control radio access network environment

• US 10,420,134 B2
• Filed: 02/02/2016
• Issued: 09/17/2019
• Est. Priority Date: 02/02/2016
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Bendle, Ian Neville, Bull, Oliver James
• Primary Examiner(s): Haile, Feben
• Application Number:
  US15/013,844
• Publication Number:
  US 20170223701A1
• Time in Patent Office: 1,323 Days
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 88/085 Access point devices with remote components

Abstract

A method is provided in one example embodiment and may include receiving a scheduling command for a subframe at a Remote Radio Unit (RRU), wherein the scheduling command provides a subframe configuration for the subframe; determining whether the subframe configuration comprises at least one resource block gap for the subframe; and if the subframe configuration comprises a resource block gap, utilizing the at least one resource block gap to accommodate one or more previously allocated resource blocks for one or more user equipment served by the RRU for which at least one of a previous downlink transmission has failed or a previous uplink grant has been delayed. In some instances, the subframe configuration can be associated with downlink transmissions and uplink transmissions for one or more user equipment served by the RRU.

Claims

1. A method comprising:

receiving a scheduling command for a subframe at a Remote Radio Unit (RRU), wherein the scheduling command provides a subframe configuration for the subframe;

determining whether the subframe configuration comprises at least one resource block gap for the subframe;

upon determining the subframe configuration comprises a resource block gap, utilizing the at least one resource block gap to accommodate one or more previously allocated resource blocks for one or more user equipment served by the RRU for which at least one of a previous downlink transmission has failed or a previous uplink grant has been delayed; and

reserving, by a Radio Access Network (RAN) controller, one or more resource block gaps within one or more subframes according to a first resource block gap reservation rate.

2. The method of claim 1, wherein the subframe configuration is associated with downlink transmissions for one or more user equipment served by the RRU.

3. The method of claim 1, wherein the subframe configuration is associated with uplink transmissions for one or more user equipment served by the RRU.

4. The method of claim 1, wherein the scheduling command comprises one or more Downlink Control Information (DCI) messages and wherein each respective DCI message corresponds to a respective user equipment having one or more resource blocks allocated for the subframe.

5. The method of claim 4, wherein determining whether the subframe configuration comprises at least one resource block gap is based, at least in part, on the one or more DCI messages included the scheduling command.

6. The method of claim 1, further comprising:

generating a retransmission status report at the RRU; and

sending the retransmission status report to the RAN controller.

7. The method of claim 6, further comprising:

updating the first resource block gap reservation rate to a second resource block gap reservation rate based on retransmission feedback information included in the retransmission status report.

8. The method of claim 1, wherein a resource block gap is restricted to a predetermined number of resource blocks.

9. One or more non-transitory tangible media encoding logic that includes instructions for execution that when executed by a processor, is operable to perform

operations comprising:

receiving a scheduling command for a subframe at a Remote Radio Unit (RRU), wherein the scheduling command provides a subframe configuration for the subframe;

determining whether the subframe configuration comprises at least one resource block gap for the subframe;

upon determining the subframe configuration comprises at least one resource block gap, utilizing the at least one resource block gap to accommodate one or more previously allocated resource blocks for one or more user equipment served by the RRU for which at least one of a previous downlink transmission has failed or a previous uplink grant has been delayed; and

reserving, by a Radio Access Network (RAN) controller, one or more resource block gaps within one or more subframes according to a first resource block gap reservation rate.

10. The media of claim 9, wherein the subframe configuration is associated with downlink transmissions for one or more user equipment served by the RRU.

11. The media of claim 9, wherein the subframe configuration is associated with uplink transmissions for one or more user equipment served by the RRU.

12. The media of claim 9, wherein the scheduling command comprises one or more Downlink Control Information (DCI) messages and wherein each respective DCI message corresponds to a respective user equipment having one or more resource blocks allocated for the subframe.

13. The media of claim 12, wherein determining whether the subframe configuration comprises at least one resource block gap is based, at least in part, on the one or more DCI messages included the scheduling command.

14. The media of claim 9, the operations further comprising:

generating a retransmission status report at the RRU; and

sending the retransmission status report to the RAN controller.

15. The media of claim 14, the operations further comprising:

updating the first resource block gap reservation rate to a second resource block gap reservation rate based on retransmission feedback information included in the retransmission status report.

16. The media of claim 9, wherein a resource block gap is restricted to a predetermined number resource blocks.

17. A system, comprising:

a memory element for storing data; and

a processor that executes instructions associated with the data, wherein the processor and the memory element cooperate such that the system is configured for;

receiving a scheduling command for a subframe at a Remote Radio Unit (RRU), wherein the scheduling command provides a subframe configuration for the subframe;

determining whether the subframe configuration comprises at least one resource block gap for the subframe;

upon determining the subframe configuration comprises at least one resource block gap, utilizing the at least one resource block gap to accommodate one or more previously allocated resource blocks for one or more user equipment served by the RRU for which at least one of a previous downlink transmission has failed or an uplink grant has been delayed; and

reserving, by a Radio Access Network (RAN) controller, one or more resource block gaps within one or more subframes according to a first resource block gap reservation rate.

18. The system of claim 17, wherein the system is further configured for:

updating the first resource block gap reservation rate based, at least in part, on one or more retransmission status reports received from the RRU.