Data pack serial number counting method and data pack transmission method
A calculation method and data packet technology, which is applied in the field of communication, can solve the problems of serial number error of the whole header data packet, ignoring the out-of-order or even packet loss of data packets, and achieve the effect of ensuring correctness
Active Publication Date: 2007-02-14
DATANG MOBILE COMM EQUIP CO LTD
View PDF0 Cites 4 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0012] The purpose of the present invention is to provide a data packet sequence number calculation method and a data packet transmission method to solve the problem that the existing calculation method does not take into account the out-of-order or even packet loss of data packets in the data transmission process, resulting in carry and abdication and high-byte loopback, etc., which in turn causes the technical problem that the serial number of the full-header data packet obtained according to the existing calculation method of the serial number of the full-header data packet is wrong
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0055] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0056] The invention provides a data packet serial number calculation method, which is used for the receiving end to obtain the data packet serial number of the full header data packet. see figure 1 , which is a flowchart of a method for calculating a sequence number of a data packet. It includes the following steps:
[0057] S10: Set the range [a, b) of the sliding window, the starting point a of the sliding window is the sequence number of the expected data packet, and the end point b of the sliding window is determined by the preset sliding window length L. When a+L-1>=65535, b=(a+L+1)&0xFFFF. Because the protocol stipulates that the serial number of the data packet starts from 1 and cannot be 0. When a+L-1<65535, b=a+L.
[0058] S20: The data packet sequence number c is composed of the high byte of a and the low byte of the currently received data packet seq...
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
Login to View More Abstract
This invention relates to a method for computing serial numbers of data packets including: 1, setting a sphere(a, b) of a sliding window, starting point (a) of which is the serial number of an expected data packet and terminal point (b) of which is determined by the length of a preset sliding window, 2, a high byte of (a) and the low byte of the serial number of the received data packet currently constitute a serial number of the data packet c, 3, judging if the high byte meeting (a) is the same with that of (b) and (c) is in the window or the bytes of them are different and (c) is in one of the conditions in the (a, x) sphere, if so, the current number of the packet is (c), otherwise, step 4 is proceeded: the high byte of (b) and the low byte of the received data packet number compose a number (e), 5, if the high bytes of (a) and (b) are different and (e) is in the (y, b) sphere, then the current number is (e) and (x) is composed of the high byte of (a) and a low byte of OxFF and (y) is composed of a high byte of (y) and an OxOO low byte, which can compute the serial numbers of all data packets.
Description
technical field [0001] The present invention relates to data transmission technology in the communication field, in particular to packet data convergence layer data transmission control technology in mobile communications, especially a data packet serial number extraction method and corresponding PDCP (packet data convergence protocol, packet data protocol) in the data transmission process Convergence protocol) packet transmission method in the case of out-of-sequence at the layer. Background technique [0002] At present, the processing of TCP / IP data packets is mainly based on the RFC2507 protocol. Since the RFC2507 protocol uses incremental compression technology, the receiving end has strict requirements on the continuity of the compressed data packets when decompressing. However, since good wireless transmission conditions are usually not guaranteed in the actual communication environment, it often occurs that the data packets received by the receiving end are out of or...
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
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L12/755
Inventor 王鑫周杰
Owner DATANG MOBILE COMM EQUIP CO LTD