Grouped data discarding method and device

Abstract

The invention discloses a grouped data discarding method and device. A corresponding discarding counter is arranged for each data unit, the operation of subtracting a fixed value is conducted on the corresponding discarding counters when a PDCP layer confirms that certain data units are overtime, an RLC layer also conducts the operation of subtracting a fixed value on the corresponding discarding counters before processing the certain data units, the PDCP layer and the RLC layer detect whether the values of discarding counters corresponding to the data units are equal to a discarding count value or not, and discarding operation is conducted on the data units corresponding to the discarding counters with the values being equal to the discarding count value. Thus, when the RLC layer discards the unsent data units which are judged to be overtime by the PDCP layer, the trouble that the PDCP layer indicates SNs of the data units needing to be discarded by the RLC layer is saved. Thus, by arranging the discarding counters, the data discarding function can be realized, interaction between the RLC layer and the PDCP layer is reduced, the problem that users have access to memory resources at the same time is effectively solved and the performance of a system is improved.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method and device for discarding packet data. Background technique [0002] In the mobile communication system, during the process of business data transmission, the user plane data from the network side are gathered at the packet data protocol convergence layer (Packet Data Convergence Protocol, PDCP) after being processed and passed through the radio link control layer (Radio Link Control , RLC) to the user terminal (User Equipment, UE). Among them, according to the type of bearer service, user plane data is divided into Acknowledged Mode (Acknowledged Mode, AM) and Unacknowledged Mode (Unacknowledged Mode, UM) transmission in RLC, AM mode has Automatic Repeat Request (Automatic Repeat Request, ARQ) function, which can ensure that data will not be lost during normal business processes. In addition, in order to cope with lossless handover, the PDCP entity mapped to the AM...

AI Technical Summary

Problems solved by technology

[0004] However, there are several situations in this service data transmission process: (1) The wireless channel environment is poor, resulting in the number of Hybrid Automatic Repeat Requests (HARQ) in the Media Access Control layer (Media Access Control, MAC) increase and the number of retransmissions at the RLC layer increases, which slows down data transmission in the PDCP layer

(2) There are a large number of UEs, and MAC scheduling cannot realize the average scheduling of each UE, resulting in that the PDCP layer data in some UEs cannot be sent in time

(3) The data traffic on the network side is large, exceeding the downlink bandwidth of the air interface, resulting in data accumulation at the PDCP layer

[0006] Although the PDCP layer determines that the corresponding PDCP PDU of a certain SN number needs to be discarded, for the RLC layer, the RLC layer cannot know the RLC SDU that needs to be discarded, because the SN number of the PDCP PDU sent by the PDCP layer must be determined at the RLC layer. Its header needs to be parsed, which breaks the hierarchy

Therefore, if the PDCP layer informs the RLC layer that the PDCP PDU corresponding to a certain SN number needs to be discarded, the interlayer interaction between the PDCP layer and the RLC layer is increased, which not only destroys the idea of ​​layering, but also reduces system efficiency. Save memory, the RLC layer and the PDCP layer both point to the same memory data object, while the RLC layer has higher requirements for real-time performance, and the PDCP layer does not have high requirements for real-time performance. Therefore, when the RLC layer and PDCP layer are processed in different tasks, the Accessing the memory data object at the same time may easily cause errors in the discarding operation

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