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Method for indicating frame ending

A frame-end and frame-indicating technology, applied in the field of digital information transmission, to achieve the effects of saving overhead, simple implementation ideas, and easy implementation

Inactive Publication Date: 2010-09-22
高通创锐讯企业管理(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the above method is applied to the physical layer of the EOC network system, the first method needs to calculate the length information of a frame before transmitting data, which requires additional circuit overhead and a certain delay; the second method Since the width of the forward error correction coding symbol is 8bit (bit), when transmitting data with the upper / lower layer, 8 / 10bit data encoding / decoding is required, thus paying a certain implementation price

Method used

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Experimental program
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Embodiment Construction

[0016] The method for indicating the end of the frame of the present invention is:

[0017] After the physical layer transmitter receives the upper layer data, add a frame header before the data frame is sent, and send a series of known sequences at the end of the data frame, such as a pseudo-random sequence (pn sequence); the receiver performs frame detection when receiving data , after finding the data segment, then perform frame end detection, that is, determine the end position of the physical frame according to the position where the correlation peak appears. After the receiving end detects that the energy of the signal is lower than the threshold after the correlation peak value, the method of outputting the frame end indication signal can greatly reduce the probability of false alarm.

[0018] The following is a specific description in conjunction with an implementation column in the EOC network system:

[0019] The transmitter packs the upper layer packets into imag...

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Abstract

The invention discloses a method for indicating frame ending, which comprises the following steps of: at a transmitting end, transmitting a frame head before transmitting a data frame, and transmitting a frame end, namely a string of known sequence, when the data frame is finished; and at a receiving end, performing frame head detection on the received data, and then performing frame end detection after detecting a data section, namely determining the position of the frame ending according to the position where a correlative peak value appears. The method can accurately calculate the position of the frame ending at the receiving end, the implementation complexity of a hardware circuit is low, and the detection probability is high. The method can be applied to a network system with an unfixed frame length, such as an EOC network.

Description

technical field [0001] The invention relates to the field of digital information transmission, in particular to a method capable of indicating the end of a frame. Background technique [0002] EOC (Ethernet Over Cable transmits Ethernet frames based on coaxial cable) network is a point-to-multipoint architecture, and one central office device (master device) is connected to multiple user end devices (slave devices) through coaxial cables. The EOC network adopts a TDM (Time Division Multiplexing, Time Division Multiplexing) method to control and manage uplink communications of multiple client devices. There are one or more splitters or distributors between the central office equipment and the user equipment. The direction in which the central office equipment sends data packets to the user equipment is the downlink direction; the direction in which the user equipment sends data packets to the central office equipment is the uplink direction. exist figure 1 In the example s...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L29/06H04L12/26
Inventor 聂红儿杜娟
Owner 高通创锐讯企业管理(上海)有限公司