Service data unit discarding method

A service data unit, protocol data unit technology, applied in electrical components, transmission systems, error prevention/detection using return channels, etc., can solve problems such as undiscussed trigger conditions, unfairness, buffer overload, etc. Resource waste and inequity, avoid processing complexity and processing overhead, avoid buffer overload effects

Inactive Publication Date: 2009-07-15
ZTE CORP
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Problems solved by technology

[0018] In this way, how to provide a new PDCP SDU discarding method for the problems existing in the existing service data unit PDCP SDU discarding method, so as to prevent the PDCP SDU from staying in the buffer for too long and cause the buffer to be overloaded, and to prevent the PDCP SDU from being immediately discarded. The waste of wireless resources and unfairness caused by discarding have become issues that technicians must consider
[0019] In addition, it should be pointed out that the RLC reset function of the LTE wireless interface is also under discussion. The existing conclusion is that handover between base stations will trigger RLC reset, and other trigger conditions have not been discussed yet.

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Embodiment Construction

[0055] The main idea of ​​the present invention is: in order to avoid the disadvantages caused by the existing method of discarding the PDCP SDU immediately or not discarding the PDCP SDU when the PDCP SDU has been assigned an RLC sequence number, certain discarding conditions are set. Performing PDCP SDU discard or RLC reset when the above conditions are met can eliminate the shortcomings of the above two methods.

[0056] The condition in the present invention is to set a preset time or preset times, trigger the polling process first within the preset time or preset times, and discard or not discard according to the results obtained after polling .

[0057] The above-mentioned main idea of ​​the present invention is based on following considerations: in fact, when the sender SDU discards the timer overtime, it does not necessarily mean that the SDU has exceeded the PDB, because the receiver may have correctly received the relevant RLC PDU, but the sender has not yet A statu...

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Abstract

The present invention discloses a method for discarding service data unit. The invention is applied to the grouping data assemblage protocol layer service data unit of communication system wireless interface based on the timer, namely the PDCP SDU discarding. The method comprises the following step: when a discarding timer corresponding with the PDCP SDU is overtime, if the PDCP SDU is already transferred to a wireless link control layer and the wireless link control layer is distributed with a wireless link control layer sequence number, firstly triggering a polling procedure in a preset time or a preset time number. The invention prevents the phenomena of wireless resource wastage and unfairness caused by immediately discarding the SDU in the prior method.

Description

technical field [0001] The invention relates to the technical field of digital mobile communication, in particular to a service data unit discarding method in a wireless communication system. Background technique [0002] The radio link control layer (RLC: Radio Link Control) of the wireless interface of the third-generation mobile communication system WCDMA (Wideband Code Division Multiple Access) includes three types of RLC entities: transparent mode (TM: Transparent Mode), unacknowledged mode (UM: Unacknowledged Mode) and confirmation mode (AM: Acknowledged Mode). The TM RLC entity and the UM RLC entity can be configured as a sending RLC entity or a receiving RLC entity, the sending RLC entity sends a Radio Link Control Protocol Data Unit (RLC PDU: Radio LinkControl Protocol Data Unit), and the receiving RLC entity receives the RLC PDU. The AM RLC entity includes a sending end and a receiving end, where the AM RLC entity at the sending end sends the RLC PDU, and the AM R...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04L29/06
Inventor 张健阮象华
Owner ZTE CORP
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