METHOD FOR SENDING RLC PDU AND ALLOCATING RADIO RESOURCE IN MOBILE COMMUNICATIONS SYSTEM AND RLC ENTITY OF MOBILE COMMUNICATIONS

• US 20090215456A1
• Filed: 01/30/2009
• Published: 08/27/2009
• Est. Priority Date: 02/01/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yi, Seung-June, Park, Sung-Jun, Lee, Young-Dae, Chun, Sung-Duck
• Granted Patent: US 9,008,004 B2
• Time in Patent Office: Days
• US Class Current: 455/435.100
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/535 based on resource usage policies
• CPC Class Codes: H04W 72/56 based on priority criteria
• CPC Class Codes: H04W 72/569 of the traffic information

Abstract

Disclosed is a transmission of a RLC STATUS PDU using a limited radio resource by MAC and RLC layers in a long term evolution (LTE) system. In case where the MAC entity prioritizes logical channels for allocating the radio resource to each logical channel, the MAC entity is allowed to allocate radio resources based upon the size of a RLC STATUS PDU to be sent from the RLC layer and also the RLC layer is allowed to use the STATUS PDU prior to RLC data PDUs upon using the allocated radio resource, such that RLC protocols can be avoided from coming in a deadlock situation due to a non-transmission of the STATUS PDU.

Claims

1. A method for transmitting radio link control (RLC) protocol data units (PDUs) in a mobile communications system, comprising:

receiving an indication of available resource from a medium access control (MAC) entity;

prioritizing transmission of RLC control PDUs over RLC data PDUs using the indication of available resource; and

transmitting the prioritized RLC PDUs.

2. The method of claim 1, further comprising:

allocating the available resource to the RLC control PDUs, and if any resource remains, then allocating the remaining resource to the RLC data PDUs.

3. The method of claim 1, wherein the RLC control PDUs denote RLC STATUS PDUs,

wherein the method further comprises:

if the available resource indicated from the MAC entity is smaller than the size of one status PDU, skipping by the RLC entity the transmission of the one status PDU for this transmitting opportunity.

4. The method of claim 3, wherein the available resource and the one status PDU are checked for every transmission time interval (TTI).

5. The method of claim 1, wherein the RLC control PDUs denote RLC STATUS PDUs,

wherein the method further comprises:

checking by the RLC entity for every transmission time interval (TTI) whether a STATUS PDU is scheduled for transmission, and if so, then informing the size of the STATUS PDU to the MAC entity.

6. A method for allocating resources for transmission in a mobile communications system, comprising:

allocating the resources such that all logical channels are served in a decreasing priority order up to the size of each radio link control (RLC) STATUS protocol data unit (PDU) waiting for transmission;

if nay resources remain, allocating such remaining resources such that all the logical channels are served in a decreasing priority order up to their configured prioritized bit rate (PBR); and

if any resources remain, allocating such remaining resources such that all the logical channels are served in a strictly decreasing priority order.

8. A method for allocating resources in a mobile communications system, comprising:

allocating, by a medium access control (MAC) layer, resources such that all logical channels are served in a decreasing priority order up to each prioritized bit rate (PBR) of the logical channels plus the size of each RLC STATUS PDU waiting for transmission; and

if any resources remain, allocating, by the MAC entity, the remaining resource such that all the logical channels are served in a strict decreasing priority order.

7. The method of claim 8, further comprising:

checking by a medium access control (MAC) entity whether a STATUS PDU is scheduled for transmission for every transmission time interval (TTI) in the RLC entity; and

receiving information related to the size of the STATUS PDU if there is the STATUS PDU scheduled for transmission.

9. The method of claim 8, further comprising:

checking, by the MAC entity, whether a STATUS PDU is scheduled for transmission for every transmission time interval (TTI) in the RLC entity, and receiving information related to the size of the STATUS PDU if the STATUS PDU is scheduled for transmission.

10. A radio link control (RLC) entity in a mobile communications system comprising a module configured to:

receive an indication of resource from a medium access control (MAC) entity;

check whether there is a STATUS PDU is scheduled to be sent to a peer RLC entity;

compare the size of the indicated resource with the size of the STATUS PDU to be sent;

primarily allocate the resource to the STATUS PDU so as to send the STATUS PDU to the peer RLC entity if the resource is larger than or equal to the STATUS PDU according to the comparison result; and

skip the transmission of the STATUS PDU if the resource is smaller than the STATUS PDU according to the comparison result.