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1. WO2013067709 - DOWNLINK TRANSMISSION COORDINATED SCHEDULING

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

What is claimed is:

1 . A method of coordinated scheduling of a downlink transmission flow from a first radio network node to a user equipment UE in a second radio network node, the method comprising a step of:

scheduling the downlink transmission flow so that the in-sequence delivery of the received data blocks can be kept in an acceptable level in the UE by adjusting a scheduling priority of the downlink transmission flow in the second radio network node.

2. The method according to claim 1 , further comprising steps of:

estimating one or more buffer-related parameters based on buffered data for the downlink transmission flow from the first radio network node; and

determining, based on the estimated one or more buffer-related parameter, if the in-sequence delivery of the received data blocks to higher layers can be in an acceptable level in the UE.

3. The method according to claim 2, wherein the estimating of one or more buffer-related parameters are further based on one or more parameters associated with the operation status of the second radio network node.

4. The method according to claim 3, wherein the parameter associated with the operation status is one or more of the data rate, transmission delay, a transmission power, and/or the like.

5. A method of coordinated scheduling at least a first and a second flows of a downlink transmission from a first radio network node to a user equipment UE in the first radio network node, each of the at least first and second flows being transmitted through one of second radio network nodes, the method comprising a step of:

scheduling the at least first and second flows so that the in-sequence delivery of the received data blocks can be kept in an acceptable level in the UE by adjusting a scheduling priority of one or more of the at least first and second flows in the corresponding second radio network nodes.

6. The method according to claim 5, further comprising steps of:

receiving one or more buffer-related parameters for the UE from the second radio network nodes; and

determining, based on the received one or more buffer-related parameters, if the in-sequence delivery of the received data blocks to higher layers can be in an acceptable level in the UE.

7. A method of coordinated scheduling at least a first and a second flows of a downlink transmission from a first radio network node to a user equipment UE in the first radio network node, each of the at least first and second flows being transmitted through one of second radio network nodes, the method comprising steps of:

receiving scheduling priorities of UEs from the second radio network nodes; splitting data blocks of the downlink transmission into the at least a first and a second flows based on the received scheduling priorities of UEs; and

transmitting the at least first and second flows to the corresponding second radio network nodes, so that the in-sequence delivery of the received data blocks can be kept in an acceptable level in the UE.

8. A method of coordinated scheduling at least a first and a second flows of a downlink transmission from a first radio network node to a user equipment UE in the first radio network node, each of the at least first and second flows being transmitted through one of second radio network nodes, the method comprising steps of:

receiving scheduling priorities of UEs from the second radio network nodes; and

configuring one or more parameters associated with the operation status of the second radio network nodes based on the received scheduling priorities of UEs, so that the in-sequence delivery of the received data blocks can be kept in an acceptable level in the UE.

9. The method according to claim 8, wherein the parameter associated with the operation status is one or more of the data rate, transmission delay, a transmission power, and/or the like.

10. The method according to any one of claims 1 -9, further comprising steps of:

determining, based on the one or more buffer-related parameters, that the in-sequence delivery of data blocks to the higher layers in the UE can reach an acceptable level even without adjusting the scheduling priority of the flow in the second radio network node, or that there may be out-of-sequence delivery of the received data blocks to the higher layers in the UE with adjusting the scheduling priority of the flow in the second radio network node; and

resetting the scheduling priority of the flow to an original scheduling priority in the second radio network node, or recalculating the scheduling priority of the flow without considering the scheduling priority adjustment.

11 . The method according to any one of claims 1 -10, wherein

the scheduling priority of the flow is adjusted by increasing the scheduling priority of the flow based on a type of the downlink transmission from the first radio network node to the UE.

12. The method according to any one of claims 1 -11 , further comprising a step of:

reporting the current scheduling priority of the UE and/or statistics related to scheduling priorities of UEs to a first radio network node.

13. The method according to claim 12, wherein

a size and/or the number of the data blocks for the UE transmitted from the first radio network node to a second radio network node are controlled based on the reported current scheduling priorities of the UE.

14. The method according to claim 12, wherein

one or more parameters (such as data rate, transmission delay, a

transmission power, and/or the like) associated with the operation status of the second radio network nodes is controlled by the first radio network node based on the reported current scheduling priority of the UE and/or the reported statistics related to scheduling priorities of UEs.

15. The method according to any one of claims 1 -14, wherein

the determination is performed further based on parameters predefined and/or configured by the first radio network node to the second radio network nodes.

16. The method according to claim 15, wherein

the predefined and/or configured parameters include one or more of: a threshold related to radio transmission (such as time or bit rate threshold, maximum number of retransmission attempts), a threshold related to maximum allowed priority for each type of multi-point transmission, and/or a threshold related to minimum allowed priority for each type of non-multi-point transmission.

17. The method according to claim 15, wherein

the predefined and/or configured parameters are notified by the first radio network node to the second radio network nodes over lub interface.

18. The method according to any one of claims 1 -17, wherein

the buffer-related parameter for the UE is a time Tempty required for emptying buffered data for the flow in a buffer of the second radio network node, which is calculated based on

TemPty = EqUatlOn 1 where NdataBits is the number of buffered data for the flow in the buffer of the second radio network node, and averageRate^ is data rate achieved for the flow over the air in a serving cell of the second radio network node.

19. The method according to claim 18, wherein

if the calculated Tempty \s larger than a low alarm threshold but smaller than a high alarm threshold, it is determined that the in-sequence delivery of the received data blocks can be kept in an acceptable level in the UE with adjusting the scheduling priority of the flow in the corresponding second radio network nodes.

20. The method according to any one of claims 1 -17, wherein

the buffer-related parameter for the UE is a data rate RateemPt required for emptying buffered data for the flow in a buffer of the second radio network node, which is calculated based on

Rateempty = N dataBits I ? desired EqUatlOn 2 where NdataBits is the number of buffered data for the UE in the buffer of the second radio network node, and Tdesired is a desire time to empty buffered data for the flow.

The method according to claim 20, wherein

if the calculated data rate s larger than a low alarm threshold but smaller than a high alarm threshold, it is determined the in-sequence delivery of the received data blocks can be kept in an acceptable level in the UE with adjusting the scheduling priority of the flow in the corresponding second radio network node.

22. The method according to any one of claims 1 -21 , further comprising step of:

reporting information related to coordinated scheduling downlink

transmission from the first and/or second radio network node to a third network node.

23. The method according to claim 22, wherein

the reported information related to coordinated scheduling downlink transmission includes one or more of: rate control parameter values, adjusted scheduling priorities of UEs, BS measurements used for adjusting the parameters associated with the coordinated scheduling, and/or second radio network node's capability of supporting rate control mechanism for coordinated scheduling.

24. The method according to claim 22 or 23, wherein

the reported information related to coordinated scheduling downlink transmission is used by the third node for one or more of the network management tasks: monitoring network performance, configuring ratio related parameters, and/or network planning and deployment.

25. The method according to any one of claims 1 -24, wherein the first radio network node is one or more of radio network controller RNC, primary eNode B, master eNode B, donor node, primary relay, centralized controller, base station controller, and/or the like.

26. The method according to any one of claims 1 -25, wherein the second radio network node is one or more of Node B, eNode B, base station BS, relay, and/or the like.

27. The method according to any one of claims 1 -26, wherein the third network node is one or more of neighboring radio network node, centralized

network node, core network node, operational support systems OSS node, operation, administration and maintenance OAM node, minimization of drive tests MDT node, self organizing network SON node, network monitoring node, and/or the like.

28. A computer-readable storage medium having computer-readable instructions to facilitate coordinated scheduling of a downlink transmission flow from a first radio network node to a user equipment UE stored thereon, that are executable by a computing device to carry out the method according to any one of claims 1 -27.

29. A second radio network node, comprising:

a scheduler configured to schedule a downlink transmission flow from a first radio network node to a user equipment UE so that the in-sequence delivery of the received data blocks can be kept in an acceptable level in the UE by adjusting a scheduling priority of the downlink transmission flow in the second radio network node.

30. The second radio network node according to claim 29, further comprising:

an estimator configured to estimate one or more buffer-related parameters based on buffered data for the downlink transmission flow from the first radio network node; and

a determiner configured to determine, based on the estimated one or more buffer-related parameter, if the in-sequence delivery of the received data blocks to higher layers can be in an acceptable level in the UE.

31 . The second radio network node according to claim 30, wherein the estimator is further configured to estimate the one or more buffer-related parameters further based on one or more parameters associated with the operation status of the second radio network node.

32. The second radio network node according to claim 31 , wherein the parameter associated with the operation status is one or more of the data rate, transmission delay, a transmission power, and/or the like.

33. The second radio network node according to any one of claims 30-32, wherein

the determiner is further configured to determine, based on the one or more buffer-related parameters, that the in-sequence delivery of data blocks to the higher layers in the UE can reach an acceptable level even without adjusting the scheduling priority of the flow in the second radio network node, or that there may be out-of-sequence delivery of the received data blocks to the higher layers in the UE with adjusting the scheduling priority of the flow in the second radio network node, and

the scheduler is further configured to reset the scheduling priority of the flow to an original scheduling priority in the second radio network node, or recalculate the scheduling priority of the flow without considering the scheduling priority adjustment.

34. The second radio network node according to any one of claims 30-33, wherein the second radio network node is one or more of Node B, eNode B, base station BS, relay, and/or the like.

35. A first radio network node, comprising:

a scheduler configured to schedule at least a first and a second flows of a downlink transmission from the first radio network node to a user equipment UE, each of the at least first and second flows being transmitted through one of second radio network nodes, so that the in-sequence delivery of the received data blocks can be kept in an acceptable level in the UE by adjusting a scheduling priority of one or more of the at least first and second flows in the corresponding second radio network nodes.

36. The first radio network node according to claim 35, further comprising: a receiver configured to receive one or more buffer-related parameters for the UE from the second radio network nodes; and

a determiner configured to determine, based on the received one or more buffer-related parameters, if the in-sequence delivery of the received data blocks to higher layers can be in an acceptable level in the UE.

37. The first radio network node according to claim 36, wherein

the determiner is further configured to determine, based on the received one or more buffer-related parameters, that the in-sequence delivery of data blocks to the higher layers in the UE can reach an acceptable level even without adjusting the scheduling priority of the flow in the second radio network node, or that there may be out-of-sequence delivery of the received data blocks to the higher layers in the UE with adjusting the scheduling priority of the flow in the second radio network node, and

the scheduler is further configured to reset the scheduling priority of the one or more of the at least first and second flows to an original scheduling priority in the corresponding second radio network nodes, or recalculate the scheduling priority of the one or more of the at least first and second flows without considering the scheduling priority adjustment.

38. A first radio network node for coordinated scheduling at least a first and a second flows of a downlink transmission from a first radio network node to a user equipment UE in the first radio network node, each of the at least first and second flows being transmitted through one of second radio network nodes, the first radio network node comprising:

a receiver configured to receive scheduling priorities of UEs from the second radio network nodes;

a splitter configured to split data blocks of the downlink transmission into the at least a first and a second flows based on the received scheduling priorities of UEs; and

a transmitter configured to transmit the at least first and second flows to the corresponding second radio network nodes, so that the in-sequence delivery of the received data blocks can be kept in an acceptable level in the UE.

39. A first radio network node for coordinated scheduling at least a first and a second flows of a downlink transmission from a first radio network node to a user equipment UE in the first radio network node, each of the at least first and second flows being transmitted through one of second radio network nodes, the first radio network node comprising:

a receiver configured to receive scheduling priorities of UEs from the second radio network nodes; and

a configurator configured to configure one or more parameters associated with the operation status of the second radio network nodes based on the received scheduling priorities of UEs, so that the in-sequence delivery of the received data blocks can be kept in an acceptable level in the UE.

40. The first radio network node according to claim 39, wherein the parameter associated with the operation status is one or more of the data rate, transmission delay, a transmission power, and/or the like.

41 . The first radio network node according to any one of claims 35-40, wherein the first radio network node is one or more of radio network controller RNC, primary eNode B, master eNode B, donor node, primary relay, centralized controller, base station controller, and/or the like.