Methods and devices for resource scheduling in wireless communication systems
A resource scheduling method includes determining, by a centralized scheduler, a classification threshold, classifying, by the centralized scheduler, each of a plurality of User Equipments (UEs) as a Cell Edge (CE) UE or a Non-Cell Edge (nCE) UE according to the classification threshold, and performing, by the centralized scheduler, a resource scheduling for the at least one CE UE and the at least one nCE UE.
1. A resource scheduling method comprising:
determining, by a centralized scheduler, a classification threshold;
classifying, by the centralized scheduler, each of a plurality of User Equipments (UEs) as a Cell Edge (CE) UE or a Non-Cell Edge (nCE) UE according to the classification threshold;
adjusting, by the centralized scheduler, the classification threshold to control a computing complexity of a computing complexity of a distributed scheduler included in a Remote Radio Head (RRH), wherein the classification threshold is adjusted to decrease a number of the nCE UE so that the computing complexity of the distributed scheduler is reduced; and
performing, by the centralized scheduler, a resource scheduling for the at least one CE UE and the at least one nCE UE.
2. The resource scheduling method according to claim 1 , further comprising:
adjusting, by the centralized scheduler, the classification threshold in response to a radio channel fluctuation.
3. The resource scheduling method according to claim 2 , wherein the classification threshold is adjusted so that a number of the nCE UE increases when the radio channel fluctuation is indicated in an unstable channel state, and decreases when the radio channel fluctuation is indicated in a stable channel state.
4. The resource scheduling method according to claim 1 , further comprising:
adjusting, by the centralized scheduler, the classification threshold in response to a fronthaul status.
5. The resource scheduling method according to claim 4 , wherein the classification threshold is adjusted so that a number of the nCE UE increases when the fronthaul status is indicated in a low quality state, and decreases when the fronthaul status is indicated in a high quality state.
6. The resource scheduling method according to claim 1 , further comprising:
adjusting, by the centralized scheduler, the classification threshold in response to a system performance.
7. The resource scheduling method according to claim 6 , wherein the classification threshold is increased or decreased to increase the system performance.
8. The resource scheduling method according to claim 1 , further comprising:
adjusting, by the centralized scheduler, the classification threshold in response to an available computing power of the centralized scheduler and/or the distributed scheduler included in the Remote Radio Head (RRH).
9. The resource scheduling method according to claim 8 wherein the classification threshold is adjusted so that a number of the nCE UE is decreased when the available computing power of the distributed scheduler is lower than a threshold.
10. The resource scheduling method according to claim 1 , further comprising:
adjusting, by the centralized scheduler, the classification threshold to control a computing complexity of the centralized scheduler.
11. The resource scheduling method according to claim 1 , further comprising:
adjusting, by the centralized scheduler, a duration of a centralized scheduling period of the centralized scheduler to control a computing complexity of the centralized scheduler or a computing complexity of the distributed scheduler included in the RRH.
12. The resource scheduling method according to claim 11 , further comprising:
increasing, by the centralized scheduler, the duration of the centralized scheduling period to reduce the computing complexity of the centralized scheduler.
13. A Base Band Unit (BBU) comprising:
one or more non-transitory computer-readable media having computer-executable instructions embodied thereon; and
at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to:
determine a classification threshold;
classify each of a plurality of User Equipments (UEs) as a Cell Edge (CE) UE or a Non-Cell Edge (nCE) nCE UE according to the classification threshold;
adjust the classification threshold to control a computing complexity of a distributed scheduler included in a Remote Radio Head (RRH), wherein the classification threshold is adjusted to decrease a number of the nCE UE so that the computing complexity of the distributed scheduler is reduced; and
perform a resource scheduling for the at least one CE UE and the at least one nCE UE.
14. The BBU according to claim 13 , wherein the at least one processor is further configured to:
adjust the classification threshold in response to a radio channel fluctuation.
15. The BBU according to claim 14 , wherein the classification threshold is adjusted so that a number of the nCE UE increases when the radio channel fluctuation is indicated in an unstable channel state, and decreases when the radio channel fluctuation is indicated in a stable channel state.
16. The BBU according to claim 13 , wherein the at least one processor is further configured to:
adjust the classification threshold in response to a fronthaul status.
17. The BBU according to claim 16 , wherein the classification threshold is adjusted so that a number of the nCE UE increases when the fronthaul status is indicated in a low quality state, and decreases when the fronthaul status is indicated in a high quality state.
18. The BBU according to claim 13 , wherein the at least one processor is further configured to:
adjust the classification threshold in response to a system performance.
19. The BBU according to claim 13 , wherein the at least one processor is further configured to:
adjust the classification threshold in response to an available computing power of a centralized scheduler and/or an available computing power of the distributed scheduler included in the Remote Radio Head (RRH).
20. The BBU according to claim 19 , wherein the classification threshold is adjusted so that a number of the nCE UE is decreased when the available computing power of the distributed scheduler is lower than a threshold.
21. The BBU according to claim 13 , wherein the at least one processor is further configured to:
adjust the classification threshold to control a computing complexity of a centralized scheduler.
22. The BBU according to claim 13 , wherein the at least one processor is further configured to:
adjust a duration of a centralized scheduling period of a centralized scheduler to control a computing complexity of the centralized scheduler or a computing complexity of the distributed scheduler included in the RRH.
23. The BBU according to claim 22 , wherein the at least one processor is further configured to:
increase the duration of the centralized scheduling period to reduce the computing complexity of the centralized scheduler.