Method and system of transferring data in a carrier aggregation environment

Patent metadata

Field	Value
Publication number	US-9525519-B2
Application number	US-201113696230-A
Country	US
Kind code	B2
Filing date	May 3, 2011
Priority date	May 3, 2010
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

Disclosed is a method for communicating service data units/Packet Data Units (PDUs) in a carrier aggregation environment, including receiving a plurality of grants on a plurality of active component carriers from an Evolved Node B, allocating transmission resources associated with the plurality of grants to at least one Radio Link Control (RLC) entity of a user equipment, identifying one of the allocated transmission resources associated with one of the plurality of grants by the at least one RLC entity based on criteria for communicating a status report, and transmitting a status PDU including the status report using the identified one of the allocated transmission resources.

First claim

The invention claimed is:

1. A method for transmitting data by a user equipment (UE) in a wireless communication supporting a carrier aggregation, the method comprising:
receiving a plurality of grants on a plurality of active component carriers from a base station;
allocating transmission resources associated with the plurality of grants to at least one radio link control (RLC) entity of the UE;
identifying at least one of the allocated transmission resources associated with at least one of the plurality of grants by the at least one RLC entity based on criteria for communicating a status report; and
transmitting, to the base station, a status packet data unit (PDU) including the status report using the identified at least one of the allocated transmission resources,
wherein the at least one of the allocated transmission resources is identified by determining whether the at least one of the allocated transmission resources accommodates a complete status report that indicates a status of data PDUs transmitted by the base station.

2. The method of claim 1 , wherein the criteria is based on one or more of a signal condition associated with the plurality of component carriers, a block error rate, a lower linked downlink component carrier path loss, a lower uplink component carrier frequency, an arrival order of the plurality of grants on the plurality of component carriers, reliability, a component carrier priority, a component carrier bandwidth, an associated hybrid automatic repeat request profile of the component carrier, a retransmission count, whether the component carrier is primary or secondary, and avoidance of segmentation/resegmentation of service data units/PDUs at the at least one RLC entity.

3. The method of claim 2 , wherein identifying the one of the allocated transmission resources associated with the at least one of the plurality of grants by the at least one RLC entity based on the criteria for communicating the status report comprises:
forming a status PDU including the complete status report that indicates the status of the data PDUs transmitted by the base station;
determining whether any of the allocated transmission resources associated with the plurality of grants can accommodate the complete status report;
if any of the allocated transmission resources can accommodate the complete status report, mapping a status PDU including the complete status report to the determined at least one of the allocated transmission resources; and
if none of the allocated transmission resources associated with the plurality of grants can accommodate the complete status report, mapping a status PDU to a maximum size of a transmission resource among the at least one of the allocated transmission resources.

4. The method of claim 3 , wherein mapping the status PDU including the complete status report to the determined at least one of the allocated transmission resources comprises:
determining whether there are multiple allocated transmission resources that can accommodate the complete status report;
if there are multiple allocated transmission resources that can accommodate the complete status report, selecting at least one of the plurality of component carriers associated with the multiple allocated transmission resources based on the criteria and mapping a status PDU including the complete status report to the allocated transmission resource associated with the selected one of the plurality of component carriers; and
if there are no multiple allocated transmission resources that can accommodate the complete status report, mapping a status PDU including the complete status report to the determined at least one of the allocated transmission resources.

5. The method of claim 1 , wherein the status PDU comprises a status report type field that indicates whether the complete status report is present in the status PDU.

6. The method of claim 3 , wherein mapping the status PDU including a maximum size of status report to the at least one of the allocated transmission resources comprises:
transmitting a status PDU including a partial status report to the one of the allocated transmission resources on an associated at least one of the plurality of component carriers; and
triggering another status report upon transmitting the status PDU with the partial status report.

7. The method of claim 1 , wherein identifying the at least one of the allocated transmission resources associated with the at least one of the plurality of grants by the at least one RLC entity comprises:
identifying a first transmission resource associated with the at least one of the plurality of grants by the at least one RLC entity from the allocated transmission resources, wherein the allocated transmission resources are received as an ordered set of allocated transmission resources.

8. The method of claim 1 , wherein identifying the at least one of the allocated transmission resources associated with the at least one of the plurality of grants by the at least one RLC entity comprises:
identifying a first transmission resource associated with the at least one of the plurality of grants from the allocated transmission resources by the at least one RLC entity, wherein the allocated transmission resources are sequentially received by the at least one RLC entity.

9. The method of claim 1 , wherein identifying the at least one of the allocated transmission resources associated with the at least one of the plurality of grants by the at least one RLC entity comprises:
identifying a first transmission resource associated with the at least one of the plurality of grants from the allocated transmission resources that can accommodate the complete status report.

10. A user equipment (UE) for transmitting data in a wireless communication supporting a carrier aggregation, the UE comprising:
a transceiver configured to transmit and receive the data over a wireless network; and
a controller configured to control receiving a plurality of grants on a plurality of active component carriers from a based station,
allocating transmission resources associated with the plurality of grants to at least one radio link control (RLC) entity of the UE,
identifying at least one of the allocated transmission resources associated with one of the plurality of grants based on criteria for communicating a status report, and
transmitting, to the base station, a status packet data unit (PDU) including the status report using the identified at least one of the allocated transmission resources,
wherein the at least one of the allocated transmission resources is identified by determining whether the at least one of the allocated transmission resources accommodates a complete status report that indicates a status of data PDUs transmitted by the base station.

11. The UE of claim 10 , wherein the criteria is based on one or more of a signal condition associated with the plurality of component carriers, a block error rate, a lower linked downlink component carrier path loss, a lower uplink component carrier frequency, an arrival order of the plurality of grants on the plurality of component carriers, reliability, a component carrier priority, a component carrier bandwidth, an associated hybrid automatic repeat request profile of the component carrier, a retransmission count, whether the component carrier is primary or secondary, and avoidance of segmentation/resegmentation of service data units/PDUs at the at least one Radio Link Control (RLC) entity.

12. The UE of claim 10 , wherein the status PDU comprises a status report selected from the group consisting of the complete status report and a partial status report.

13.

Assignees

• Shrivastava Vinay Kumar
• Manepalli Venkateswara Rao
• Samsung Electronics Co Ltd

Inventors

• Shrivastava Vinay Kumar
• Manepalli Venkateswara Rao

Classifications

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L5/001

  the frequencies being arranged in component carriers · CPC title

• H04L1/1864

  ARQ related signaling (H04L1/1607 takes precedence) · CPC title

• H04L1/1854

  Scheduling and prioritising arrangements · CPC title

• H04L1/1685 Primary

  the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal · CPC title