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Method and equipment for discarding SDUs (service data units) under radio link control (RLC) UM (unacknowledged mode)

A wireless link control and mode technology, applied in the field of communication, can solve the problems of reducing processing efficiency, increasing memory overhead, timeout, etc., and achieve the effect of improving processing efficiency, reducing memory overhead, and reducing processing overhead

Inactive Publication Date: 2011-05-04
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] 2.1. Discard_Timer (discard timer) timeout;
[0018] The SDU discarding mechanism in the RLC UM mode provided by the prior art requires the PDCP entity to store the time point information of each SDU, and requires the PDCP entity and the RLC entity to frequently interact with the SDU discarding indication or the SDU transmission status, thereby increasing Increased memory overhead, increased interaction processing overhead between layers, and reduced processing efficiency

Method used

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  • Method and equipment for discarding SDUs (service data units) under radio link control (RLC) UM (unacknowledged mode)
  • Method and equipment for discarding SDUs (service data units) under radio link control (RLC) UM (unacknowledged mode)
  • Method and equipment for discarding SDUs (service data units) under radio link control (RLC) UM (unacknowledged mode)

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1 of the present invention provides a method for discarding SDUs in RLC UM mode, such as Figure 4 shown, including:

[0050] Step 401, the RLC entity receives the SDU sent by the upper layer, and records the receiving time point of the SDU;

[0051] Step 402, the RLC entity detects unsent SDUs, and discards the unsent SDUs if it detects that the difference between the current time and the receiving time point of the unsent SDUs exceeds the corresponding discard timer.

[0052] The duration of the discard timer in the RLC entity is configured by RRC when the data radio bearer is established.

[0053] The detecting the unsent SDU by the RLC entity includes: when each half-frame of the system is interrupted, the RLC entity detects each unsent SDU.

[0054] Wherein, after detecting that the difference between the current time and the receiving time point of the unsent SDU exceeds the duration of the corresponding discarding timer, before discarding the unsent ...

Embodiment 2

[0059] Embodiment 2 of the present invention provides a method for discarding SDUs in RLC UM mode, such as Figure 5 shown, including:

[0060] Step 501, the PDCP entity receives the SDU;

[0061] Step 502, the PDCP entity forwards the SDU to the RLC entity.

[0062] Wherein, after the PDCP entity receives the SDU, further includes: the PDCP entity acquires the receiving time point of the SDU, and the PDCP entity sends the receiving time point of the SDU to the RLC entity.

[0063] If it is currently in the handover / re-establishment state, before the PDCP entity forwards the SDU to the RLC entity, it also includes:

[0064] The PDCP entity stores the SDU;

[0065] After the handover / re-establishment is completed, the PDCP entity judges whether the SDU has timed out, discards the SDU if timed out, and executes the step of forwarding the SDU to the RLC entity if not timed out.

Embodiment 3

[0067] Embodiment 3 of the present invention provides a method for discarding SDUs in RLC UM mode, such as Image 6 shown, including:

[0068] Step 601 , when the data radio bearer in UM mode is established, the RRC configures the discard timer duration for the RLC entity and the PDCP entity.

[0069] Wherein, preferably, the discard timers of the RLC entity and the PDCP entity have the same duration.

[0070] Step 602, when the PDCP entity receives a UM SDU, obtains the receiving time point of the SDU.

[0071] In step 603, the PDCP entity judges whether it is currently in a handover / re-establishment (ie handover or re-establishment) state, and if the judgment result is yes, execute step 604; otherwise, execute step 605.

[0072] Wherein, the re-establishment state refers to the RRC connection re-establishment state.

[0073] In step 604, the PDCP entity stores the received SDU, and when the PDCP state returns to normal after handover / re-establishment, judges whether the S...

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Abstract

The invention discloses a method and equipment for discarding SDUs (service data units) under a radio link control unacknowledged mode (RLCUM). The method comprises the following steps: an RLC entity receives the SDUs sent by an upper layer, and records the time point for receiving the SDUs; the RLC entity detects the received SDUs which are not sent; and if the difference between the current time and the time point for receiving the unsent SDUs exceeds the corresponding time length set by a discard timer, the unsent SDUs are discarded. In the embodiment of the invention, the RLC entity initiatively judges whether the SDUs are discarded according to the time point for receiving the SDUs and the time length set by the discard timer, thus avoiding frequent interaction of SDU discard instructions between the RLC entity and a PDCP (packet data convergence protocol) entity or interaction of the situations for sending the SDUs, reducing memory expenditures and interactive processing expenditures between layers, and improving processing efficiency.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and equipment for discarding SDUs in the UM mode of a radio link control protocol. Background technique [0002] Different QCI (QoS Class Identifier, Qos category identification) services have their own transmission delay requirements for their data packets. When the data radio bearer is established, the RRC (Radio Resource Control, Radio Resource Control Protocol) configures the SDU (Service Data Unit, Service Data Unit) discard timer for the PDCP (Packet Data Convergence Protocol, Packet Data Convergence Protocol) entity, and the PDCP The entity implements the SDU timing discard function to ensure data transmission delay and air interface resource utilization efficiency, and the buffer does not overflow. [0003] In the RLC (Radio Link Control, radio link control protocol) AM mode (confirmation mode), according to the PDCP protocol function, the PDCP entity needs to ...

Claims

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Application Information

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IPC IPC(8): H04W28/06
Inventor 周宇恒吴艳军
Owner DATANG MOBILE COMM EQUIP CO LTD
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