Timing signal transmitting method and system based on OBSAI protocol

Abstract

The invention discloses a timing signal transmission method which has high reliability and simple realization based on an OBSAI protocol, and a system thereof. The main technical proposal of the method includes that: 1. a standard tick is respectively constructed in each sub-node, wherein, the phase position of the standard pulse of the sub-node adjacent to a master node should correspond to the phase position of the standard pulse of an adjacent upstream node; 2. the advanced timing signal pulse of a master node broadcasts a timing signal indication message to each sub-node in a span; 3. after receiving the timing signal indication message, each sub-node respectively generates the timing signal of the node in the next pulse time of the standard tick. The invention can be taken as a substitute for the self-contained timing signal transmission proposal of the OBSAI protocol.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a timing signal transmission method and system based on the OBSAI protocol. technical background [0002] The OBSAI (Open Base Station Architecture Initiator Organization) protocol, as one of the baseband radio frequency interface standards widely used in the world, has a set of detailed procedures for timing signal transmission between baseband radio frequency interfaces, which are described below. [0003] The OBSAI protocol defines a special frame structure, the frame length is 10ms, and the frames are separated by a special code (K code). For the convenience of description, OBSAI defines another signal: Tick, its high pulse exactly corresponds to the frame boundary, the width is equal to the width of the frame boundary, and the period is also 10ms. The relationship between them is shown in the appendix figure 1 . For two nodes connected using OBSAI, the data stream betwe...

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Problems solved by technology

But the transmission delay of the tick is different from the transmission delay of the message, so even if we know the phase relationship between the sending tick and the message, after several links are transmitted, the phase relationship between the message and the receiving tick There will be a big change, and it is very difficult to find the specified tick according to the SFN. This is a serious shortcoming of this method

In addition, in cascading networking, in order to maintain the absolute stability of the OBSAI link, the ticks of each link should be independent of each other, but the timing signal transmission method recommended by the OBSAI protocol requires that the ticks of each link remain fixed Phase relationship, which will bring a great test to the stability of the link

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