PWE3 device and method for reading and writing data in jitter buffer of device

Abstract

The invention discloses a PWE3 (Pseudo-Wire Emulation Edge to Edge) device and a method for reading and writing data in a jitter buffer of the device. The method comprises the steps as follows: setting cycles at intervals, counting residual data amount in the jitter buffer, and obtaining a statistics PDV (path delay value) according to the residual data amount and a TDM (time division multiplexing) business data rate V; ensuring the difference value between the statistics PDV and the current PDV, decreasing the current PDV according to a set step width if the absolute value of the difference value is larger than a set threshold value and the difference value is negative, and increasing the current PDV according to the set step width if the absolute value of the difference value is larger than the set threshold value and the difference value is positive; and determining data amount PDVt according to the TDM business data rate V and the current PDV, and starting to read data from the jitter buffer after data is started to be written in the jitter buffer and until the data amount reaches PDVt. According to the embodiment of the invention, the PDV used for reading and writing jitter buffer data is adjusted dynamically according to a specific step width, so that the balance between delay and packet loss can be realized effectively.

Description

technical field [0001] The invention relates to the technical field of the Internet, in particular to a method and device for dynamically adjusting a jitter buffer. Background technique [0002] The PWE3 (Pseudo-Wire Emulation Edge to Edge, edge-to-edge pseudowire emulation) working group under the IETF (Internet Engineering Task Force, Internet Engineering Task Force) is dedicated to PSN (Packet-Switched Network, packet switching network) Research on simulating Layer 1 and Layer 2 services. The PWE3 mechanism makes it possible to transmit TDM (Time Division Multiplexing, Time Division Multiplexing) services in a packet network. [0003] TDMoIP (Time Division Multiplexing over IP, TDM transmission over IP network) is a specific implementation technology under the PWE3 mechanism. -PDH (Plesiochronous Digital Hierarchy) / SDH (Synchronous Digital Hierarchy) Such as the transmission of TDM business. [0004] The network reference model of TDMoIP is as follows: figure 1 As sh...

AI Technical Summary

Problems solved by technology

However, since the current PWE3 device on the receiving side estimates a PDV based on experience, and the PDV of the network will also change in real time, when the PDV is estimated to be too large, it will bring additional delay in the TDM network, and when the PDV is too small, the packet cannot be compensated. With the PDV brought by the Internet, the jitter cache will frequently appear empty and cause packet loss. It is difficult to achieve a balance between packet loss and delay.

Images