Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and apparatus for indicating data packet head

A technology of equipment and data, which is applied in the field of data packet header indication method and equipment, and can solve problems such as overhead

Inactive Publication Date: 2009-07-01
HUAWEI TECH CO LTD
View PDF0 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the change range of the entire MAC PDU is very large, and only fixed CRC32 is used in the existing protocol, which will cause unnecessary overhead for smaller PDUs

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and apparatus for indicating data packet head
  • Method and apparatus for indicating data packet head
  • Method and apparatus for indicating data packet head

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] The embodiment of the present invention provides a data packet header indication method, such as image 3 As shown, it includes the following steps:

[0043] In step s301, the sending end device determines to generate a corresponding CRC indication field according to the length of the protocol data unit PDU in the media access control MAC frame. In the existing general MAC header, the field CI is an indication of CRC, CI=1 indicates that CRC is used, and CRC=0 indicates that CRC function is not included; the field Rsv is a reserved field and is not used in 802.16e. The embodiment of the present invention combines a 1-bit field CI and a 1-bit field Rsv totaling 2 bits, and indicates the size of the CRC used according to different PDU sizes. The basic principle is that the size of the CRC is proportional to the size of the PDU, namely The larger the PDU, the larger the CRC. Generally, CRC size can be CRC0, CRC8, CRC12, CRC16, CRC24, CRC32. Among them, CRCn represents the use ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an indicating method of a data header, which comprises the following steps: a sending terminal device determines and generates a corresponding CRC indicator field according to the length of a protocol data unit PDU of a media access control MAC frame; the sending terminal device sends the MAC frame carried with the CRC indicator field to a receiving terminal device; and the receiving terminal device carries out corresponding CRC check. The invention further discloses a cyclic redundancy check device. The embodiment of the invention provides a flexible universal MAC header structure which can flexibly select a CRC byte according to a PDU byte, such as CRC8, CRC16, CRC24, CRC32 and the like, thereby reducing the cost, further satisfying the optimization of an MAC layer in an 802.16e plus system and reducing the cost demands of the MAC layer.

Description

Technical field [0001] The present invention relates to the field of communication technology, and in particular to a data packet header indication method and equipment. Background technique [0002] The format of 802.16e MAC (Medium Access Control) PDU (Protocol Data Unit) is as follows figure 1 As shown, each PDU contains a fixed-length general MAC frame header, after the general MAC frame header is the MAC PDU payload; the payload contains 0 or more sub-headers, 0 or more MAC SDU (Service Data Unit, Service data units) and / or their segments. The length of the payload information is variable, so the MAC PDU can also represent variable-length byte streams, so that the MAC layer does not need to know the format and bit arrangement of the message, and only provides transparent transmission channels for various high-level service types. [0003] At the MAC layer, the general MAC frame header includes the downlink MAC frame header, and the MAC management message or CS data is inclu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H04L29/06H04L1/00
CPCH04L1/0057H04L1/0029
Inventor 余荣道
Owner HUAWEI TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com