Data transmission method and system for wireless link control layer

Abstract

The invention provides a data transmission method for radio link control layer, which comprises the steps that: a protocol data unit is sent; a judgment on whether or not the polling process is disabled and the PDU is the last one in a PDU segment is made; if the two conditions are simultaneously satisfied, then a timer is started; the state information is received and correspondingly processed. . In addition, the invention also provides a data transmission system for radio link control layer, which comprises an electric transmitter used for sending the protocol data unit PDU, a control judgment unit used for judging whether or not the polling processing is disabled and the PDU is the last one in the PDU segment and starting the timer under the circumstance that the two conditions are simultaneously met and a receiver used for receiving the state information. The invention can effectively enhance the retransmission efficiency, increase the utilization ratio of the wireless frequency band and improve the average transfer rate of the information.

Description

technical field [0001] The present invention relates to the communication field, in particular to a data transmission method and system of a wireless link control layer. Background technique [0002] Wideband Code Division Multiple Access (WCDMA, Wideband Code Division Multiple Access) and Time Division-Synchronous Code Division Multiple Access (TD-SCDMA, Time-Division Synchronization Code Division-Multiple-Access) are current mainstream international standards for third-generation mobile communication systems. The current international standard specifies the 3rd Generation Partnership Project (3GPP, 3 rd generation partnership project) in the radio link control (RLC, Radio Link Control) layer of the high-level protocol to realize the data transmission method. The RLC layer always receives the service data unit (SDU, Service Data Unit) from the higher layer first, and then segments the received SDU, each segment is called a protocol data unit (PDU, ProtocolData Unit), each...

AI Technical Summary

Problems solved by technology

If the last PDU in a section of PDUs belonging to an SDU cannot set the Polling bit because the Polling condition is prohibited, then once the last PDU is lost during the communication process, the receiving end will not be able to judge whether there is an SDU based on the sequence number. The PDU is lost, so even if the receiving end sends a status report to notify the sending end, it will not indicate whether the PDU has been received, and the sending end will not start the Polling timer because the polling bit is not set, so it is impossible to resend The PDU

[0014] Obviously, the sending end can neither retransmit the PDU, nor does the receiving end know whether there is such a PDU, so the RLC layer will be in a deadlock state, and only when the timer at the higher layer times out, the entire SDU will be retransmitted. pass

In addition, the deadlock of the RLC layer will bring great disadvantages, especially when the length of the SDU is much larger than the length of the PDU, it will cause a long transmission delay and other unpredictable consequences, and even cause the entire file transmission to fail. Thus greatly reducing the efficiency of channel usage and the actual data transmission rate

Images