Method for fast retransmission and feedback of RLC AM mode

Abstract

The invention discloses a method for fast retransmission and feedback of a radio link control acknowledgement (RLC AM) mode. An RLC layer of a sending terminal sends data to an MAC layer of the sending terminal, while notifies RLC data information to the MAC layer; the MAC layer performs information binding of the RLC data information and an HARQ process identification number of a mixed automatic retransmission request used in a current sending process; the MAC layer of the sending terminal executes an HARQ process and sends data; if acknowledgement (ACK) is received, according to the HARQ process identification number, the RLC data information bound by the HARQ progress is reported to the RLC layer; if negative acknowledgement (NACK) is still received if the maximum HARQ retransmission is carried out, according to the HARQ process identification number, the RLC data information bound by the HARQ progress is reported to the RLC layer; and the RLC layer of the sending terminal receives the acknowledgement (ACK) back-fed from the RLC layer of the sending terminal, and notifies the incident and the corresponding RLC data information to the MAC layer.

Description

technical field [0001] The present application relates to the technical field of wireless communication, and in particular to a method for fast retransmission and feedback in Radio Link Control (RLC, Radio Link Control) Acknowledgment (AM) mode. Background technique [0002] In the 3G / 4G wireless communication system, the data packets received by the base station and the core network first pass through the Packet Data Convergence Protocol (PDCP, Packet Data Convergence Protocol) layer, and after being compressed and encrypted by the IP header, they are transferred to the RLC layer. After the transmission requirements of the access control (MAC, Media Access Control) layer are segmented and concatenated, they are transferred to the MAC layer, and finally form a wireless signal from the air interface and send it out. [0003] According to the characteristics and requirements of business transmission, data transmission is divided into transmission with connection confirmation g...

AI Technical Summary

Problems solved by technology

These will lead to interruption and delay of business transmission, and even lead to packet loss in severe cases

On the other hand, the RLC sending window has a length limit. If the feedback confirmation packet is delayed, it will also cause the sending window to be full and get stuck, which will cause the data sending to stop

From the above analysis, it can be seen that for high-reliability service transmission, the use of bidirectional link transmission with feedback confirmation requires both the forward and reverse links to have small delay and reliable transmission performance, and the forward service data PDU transmission and The loss of reverse feedback status PDU transmission will lead to ARQ retransmission of RLC, which will easily lead to the full sending window and affect the service rate

The delay in the reverse feedback status PDU transmission will also cause the sender to fail to send new PDUs when the sending window is full, affecting the service rate.

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