Control method of wireless link layer flow

Abstract

A flow control method of a wireless link layer, comprising the following steps: (1) during data transmission, when the receiving end detects that the memory space for buffering data transmitted on the data link is insufficient, trigger flow control; (2 ) The receiving end stops receiving the protocol data unit AMD PDU with sequence number SN≥VR_H; (3) The receiving end sends a status report including retransmission PDU information and adjustment sending window information to the sending end; (4) If the receiving end is in the preset When the retransmission PDU is received within a certain period of time and it is detected that the memory space buffering the data transmitted on the data link reaches a threshold, the flow control is ended; otherwise, step (3) is performed. In the present invention, flow control may be triggered when the receiving end detects that the data link used for transmitting the data has deteriorated to a preset condition. The invention avoids the crash of the receiving end due to memory exhaustion; in the case of poor wireless link, it reduces the transmission of data outside the receiving window and improves the link quality of the wireless environment.

Description

technical field [0001] The invention relates to the field of communication, in particular to a flow control method of RLC (Radio Link Layer) of 3GPP (Third Generation Mobile Communication System). Background technique [0002] In the existing TDD / CDMA mobile communication system, such as figure 1 Architecture of the air interface protocol shown. The air interface protocol system is mainly divided into three layers, the lowest layer is the physical layer (PHY) L1; above the physical layer is the data link layer L2, which includes the media access control layer (MAC) and the radio link control layer (RLC). [0003] RLC provides data link establishment and release services. On the control plane, RLC bears the upper layer services called Signal radio bearer (Signal radio bearer, SRB), and the data transmitted on the SRB is signaling; on the user plane, if PDCP (Packet Data Protocol Convergence Sublayer ) and BMC (broadcast / multicast control sublayer) are not used by the busi...

AI Technical Summary

Problems solved by technology

[0009] In addition, although the sending window in the 3GPP RLC protocol also uses the confirmation-sliding mechanism, in order to avoid the problem of low sending efficiency caused by the stagnation of the sending window in GPRS RLC, in 3GPP RLC, the sending window is generally set larger (the receiving window 2, 3 times), so the sending window rarely stagnates, and the flow control scheme of GPRS RLC cannot be used in 3GPP RLC

[0010] That is to say, there is currently no flow control scheme suitable for the link characteristics of 3GPP RLC, so that the 3GPP communication system can reasonably and efficiently perform flow control on the wireless link

Images