Semi-persistent scheduling method

• US 8,594,057 B2
• Filed: 07/15/2009
• Issued: 11/26/2013
• Est. Priority Date: 08/06/2008
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Huang, Yada, Zhang, Yincheng
• Primary Examiner(s): Nguyen, Hanh N
• Assistant Examiner(s): Kading, Joshua A
• Application Number:
  US13/056,275
• Publication Number:
  US 20110128896A1
• Time in Patent Office: 1,595 Days
• Field of Search: None
• US Class Current: 370/336
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04W 72/04 Wireless resource allocation

Abstract

A semi-persistent scheduling method is provided in the present disclosure, and the method comprises: when a semi-persistent scheduling periodicity comes, an evolved node B (eNB) and a terminal (UE) select a sub-frame in a sub-frame group as a sub-frame for current semi-persistent scheduling; the sub-frame group includes multiple sub-frames, and a sub-frame group periodicity equals to the semi-persistent scheduling periodicity. The problem that the sub-frames with the same relative position in different sub-frame groups are the sub-frames in which the collision between the initial transmission and the retransmission of the HARQ data packet most possibly occurs is considered by the technical solution of the present disclosure, so the purpose that prolonging the interval length of the collision between the initial transmission of the HARQ and the retransmission of the HARQ and reducing the collision between the initial transmission of the HARQ and the retransmission of the HARQ is achieved by reasonably configuring the number of sub-frames in a sub-frame group and alternately using different sub-frames in the sub-frame group.

Claims

1. A semi-persistent scheduling method, comprising:

at a semi-persistent scheduling periodicity interval, an evolved node B (eNB) and a terminal (UE) select a sub-frame from a sub-frame group as a sub-frame for the current semi-persistent scheduling,

wherein the sub-frame group including multiple sub-frames and a sub-frame group periodicity is equal to the semi-persistent scheduling periodicity,

wherein during a semi-persistent scheduling, a sub-frame selected by the eNB from a sub-frame group for the current semi-persistent scheduling and a sub-frame selected by the UE from the sub-frame group for the current semi-persistent scheduling have the same relative position in the sub-frame group; and

a sub-frame selected for a semi-persistent scheduling and a sub-frame selected for an immediately next semi-persistent scheduling have different relative positions in their respective sub-frame groups,

wherein the sub-frame group periodicity refers to the number of sub-frames between two sub-frames with the same relative position in their respective sub-frame groups, the two sub-frame groups for the two sub-frames are successive and with no other sub-frame group in between;

wherein for any two successive schedulings with no other scheduling in between, the sub-frames for the two successive schedulings have different relative positions in their respective sub-frame groups.

2. The method according to claim 1, wherein the sub-frame group periodicity is equal to the semi-persistent scheduling periodicity refers to that:

in adjacent sub-frame groups, the number of sub-frames which are between two sub-frames with the same relative position in sub-frame groups equals to the semi-persistent scheduling periodicity; and

the semi-persistent scheduling periodicity is represented by the number of sub-frames, and for an LTE TDD system, the semi-persistent scheduling periodicity only includes uplink or downlink sub-frames, or includes both uplink and downlink sub-frames.

3. The method according to claim 2, wherein

the semi-persistent scheduling periodicity is notified by the eNB to the UE.

4. The method according to claim 2, wherein the sub-frame group is determined in the following way:

the eNB notifies the UE of the number N of sub-frames in the sub-frame group;

in the process of the semi-persistent scheduling, the eNB indicates an initial sub-frame of the sub-frame group to the UE through a PDCCH with a semi-persistent scheduling grant; and

for uplink semi-persistent scheduling in an LTE TDD system, the initial sub-frame and following continuous N−

1 uplink sub-frames form the sub-frame group.

5. The method according to claim 2, wherein the sub-frame group is determined in the following way:

the eNB notifies the UE of an initial sub-frame and the number N of the sub-frames in the sub-frame group; and

for uplink semi-persistent scheduling in an LTE TDD system, N uplink sub-frames which begin from a first uplink sub-frame following the initial sub-frame form the sub-frame group if the initial sub-frame is a downlink sub-frame, or the initial sub-frame and the following continuous N−

1 uplink sub-frames form the sub-frame group if the initial sub-frame is an uplink sub-frame.

6. The method according to claim 2, wherein the sub-frame group is determined in the following way:

a system predefines multiple sub-frame groups and configures an index number for each sub-frame group; and

the eNB notifies the UE of the index number or indication information for indicating the sub-frame group.

7. The method according to claim 2, wherein

when the semi-persistent scheduling is activated for the first time, the eNB indicates one sub-frame in the sub-frame group as the sub-frame for the first semi-persistent scheduling to the UE through a PDCCH with a semi-persistent scheduling grant.

8. The method according to claim 3, wherein the sub-frame group is determined in the following way:

the eNB notifies the UE of the number N of sub-frames in the sub-frame group;

in the process of the semi-persistent scheduling, the eNB indicates an initial sub-frame of the sub-frame group to the UE through a PDCCH with a semi-persistent scheduling grant; and

for uplink semi-persistent scheduling in an LTE TDD system, the initial sub-frame and following continuous N−

1 uplink sub-frames form the sub-frame group.

9. The method according to claim 3, wherein the sub-frame group is determined in the following way:

the eNB notifies the UE of an initial sub-frame and the number N of the sub-frames in the sub-frame group; and

for uplink semi-persistent scheduling in an LTE TDD system, N uplink sub-frames which begin from a first uplink sub-frame following the initial sub-frame form the sub-frame group if the initial sub-frame is a downlink sub-frame, or the initial sub-frame and the following continuous N−

1 uplink sub-frames form the sub-frame group if the initial sub-frame is an uplink sub-frame.

10. The method according to claim 3, wherein the sub-frame group is determined in the following way:

a system predefines multiple sub-frame groups and configures an index number for each sub-frame group; and

the eNB notifies the UE of the index number or indication information for indicating the sub-frame group.

11. The method according to claim 3, wherein

when the semi-persistent scheduling is activated for the first time, the eNB indicates one sub-frame in the sub-frame group as the sub-frame for the first semi-persistent scheduling to the UE through a PDCCH with a semi-persistent scheduling grant.

12. The method according to claim 1, wherein during a semi-persistent scheduling, the operation that the eNB and the UE select a sub-frame in the sub-frame group for the current semi-persistent scheduling refers to that:

the eNB and the UE both select a sub-frame from the sub-frame group successively and circularly in sequence or inverted sequence; and

sub-frames in the sub-frame group are sequenced in terms of time sequence.

13. The method according to claim 12, further comprising:

a system specifying that sub-frames are selected in sequence or inverted sequence;

or the eNB notifying the UE to select sub-frames in sequence or inverted sequence.

14. The method according to claim 12, wherein the sub-frame group is determined in the following way:

the eNB notifies the UE of the number N of sub-frames in the sub-frame group;

in the process of the semi-persistent scheduling, the eNB indicates an initial sub-frame of the sub-frame group to the UE through a PDCCH with a semi-persistent scheduling grant; and

for uplink semi-persistent scheduling in an LTE TDD system, the initial sub-frame and following continuous N−

1 uplink sub-frames form the sub-frame group.

15. The method according to claim 12, wherein the sub-frame group is determined in the following way:

the eNB notifies the UE of an initial sub-frame and the number N of the sub-frames in the sub-frame group; and

for uplink semi-persistent scheduling in an LTE TDD system, N uplink sub-frames which begin from a first uplink sub-frame following the initial sub-frame form the sub-frame group if the initial sub-frame is a downlink sub-frame, or the initial sub-frame and the following continuous N−

1 uplink sub-frames form the sub-frame group if the initial sub-frame is an uplink sub-frame.

16. The method according to claim 12, wherein the sub-frame group is determined in the following way:

a system predefines multiple sub-frame groups and configures an index number for each sub-frame group; and

the eNB notifies the UE of the index number or indication information for indicating the sub-frame group.

17. The method according to claim 12, wherein

when the semi-persistent scheduling is activated for the first time, the eNB indicates one sub-frame in the sub-frame group as the sub-frame for the first semi-persistent scheduling to the UE through a PDCCH with a semi-persistent scheduling grant.

18. The method according to claim 13, wherein

when the semi-persistent scheduling is activated for the first time, the eNB indicates one sub-frame in the sub-frame group as the sub-frame for the first semi-persistent scheduling to the UE through a PDCCH with a semi-persistent scheduling grant.

19. The method according to claim 13, wherein the sub-frame group is determined in the following way:

the eNB notifies the UE of the number N of sub-frames in the sub-frame group;

in the process of the semi-persistent scheduling, the eNB indicates an initial sub-frame of the sub-frame group to the UE through a PDCCH with a semi-persistent scheduling grant; and

for uplink semi-persistent scheduling in an LTE TDD system, the initial sub-frame and following continuous N−

1 uplink sub-frames form the sub-frame group.

20. The method according to claim 13, wherein the sub-frame group is determined in the following way:

the eNB notifies the UE of an initial sub-frame and the number N of the sub-frames in the sub-frame group; and

for uplink semi-persistent scheduling in an LTE TDD system, N uplink sub-frames which begin from a first uplink sub-frame following the initial sub-frame form the sub-frame group if the initial sub-frame is a downlink sub-frame, or the initial sub-frame and the following continuous N−

1 uplink sub-frames form the sub-frame group if the initial sub-frame is an uplink sub-frame.

21. The method according to claim 13, wherein the sub-frame group is determined in the following way:

a system predefines multiple sub-frame groups and configures an index number for each sub-frame group; and

the eNB notifies the UE of the index number or indication information for indicating the sub-frame group.

22. The method according to claim 1, wherein the sub-frame group is determined in the following way:

the eNB notifies the UE of the number N of sub-frames in the sub-frame group;

in the process of the semi-persistent scheduling, the eNB indicates an initial sub-frame of the sub-frame group to the UE through a physical downlink control channel (PDCCH) with a semi-persistent scheduling grant; and

for uplink semi-persistent scheduling in an LTE TDD system, the initial sub-frame and following continuous N−

1 uplink sub-frames form the sub-frame group.

23. The method according to claim 1, wherein the sub-frame group is determined in the following way:

the eNB notifies the UE of an initial sub-frame and the number N of the sub-frames in the sub-frame group; and

for uplink semi-persistent scheduling in an LTE TDD system, N uplink sub-frames which begin from a first uplink sub-frame following the initial sub-frame form the sub-frame group if the initial sub-frame is a downlink sub-frame, or the initial sub-frame and the following continuous N−

1 uplink sub-frames form the sub-frame group if the initial sub-frame is an uplink sub-frame.

24. The method according to claim 1, wherein the sub-frame group is determined in the following way:

a system predefines multiple sub-frame groups and configures an index number for each sub-frame group; and

the eNB notifies the UE of the index number or indication information for indicating the sub-frame group.

25. The method according to claim 1, wherein

when the semi-persistent scheduling is activated for the first time, the eNB indicates one sub-frame in the sub-frame group as the sub-frame for the first semi-persistent scheduling to the UE through a PDCCH with a semi-persistent scheduling grant.