CN1119885C - Information element transmission method - Google Patents
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- CN1119885C CN1119885C CN 00103361 CN00103361A CN1119885C CN 1119885 C CN1119885 C CN 1119885C CN 00103361 CN00103361 CN 00103361 CN 00103361 A CN00103361 A CN 00103361A CN 1119885 C CN1119885 C CN 1119885C
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- error correction
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Abstract
The present invention belongs to the technical field of electric communication and relates to an information element transmission method which comprises 1) a real-time mark is set in an information element to differentiate between a real-time service information element and a non-real-time service information element; 2) a retransmission error correction method of section-by-section transmission link and information-element-by-information-element is applied to the non-real-time service information element. In a process of retransmission error correction, error correction of bit-by-bit great number judgment can be adopted; for non-real-time service information element, a retransmission error correction method of mixed adoption of retransmission error correction and forward error correction, or a retransmission error correction method of mixed adoption of forward error correction and bit-by-bit great number judgment, can be applied to the non-real-time service information element. The present invention can improve the reliability of signaling and of data transmission, and can not cause an increase in transmission delay of the real-time service information element.
Description
Technical field
The invention belongs to technical field of telecommunications, particularly a kind of integrated service network technology.
Background technology
At present, general a kind of communication network transmits a kind of communication service.Telephone network transmits phone; Telegraph network transmits telegram, and computer network transmits computer data.Certainly, now the kind of computer network is a lot, as X.25 net, frame relay network, internet or the like.
Integrated service network is a kind of communication network that can transmit various communication service.There has been integrated services network just can only build a kind of communication network, and can have solved the transmission problem of various communication services.This make communication network construction, administer and maintain all and become simply.Integrated service network is divided into narrow band synthesis service communication net and broad band Integrated service communication network (English is abbreviated as BISDN) again.Can they be differentiation to transmit wideband communications service.Because integrated services network generally all with digital transmission, is commonly referred to as integrated service digital network.
Various communication networks all have the information transmission mode of oneself.Telephone network adopts the telephone exchange mode; X.25 net adopts the virtual circuit block exchange mode; The internet adopts the datagram packet exchanged form; International telephone union (ITU) regulation broad band Integrated service digital communication network adopts asynchronous communication mode (English abbreviates ATM as).ATM also is translated into asynchronous transfer mode or asychronous transfer mode etc.Martin. moral. general Rake proposes the four big features of ATM in his outstanding " ATM-A Solution to BISDN " (also seeing Cheng Shiduan, Liu Binyi " asychronous transfer mode-Broadband ISDN technology "):
(1) there be not error control and flow control on the link basis piecemeal;
(2) ATM works in connection-oriented mode;
(3) the packets headers function reduces;
(4) message segment length is less.
Error control on the so-called link basis piecemeal is in other words for every section transmission line, and receiving terminal all will carry out error detection.If (in ATM, cell is in packet again to find to have error of transmission, receiving terminal will try every possible means to notify transmitting terminal to retransmit the packet that is passed mistake just now.), till this grouping was by correct the reception, link repeating transmission error correction had very strong anti-transmission error code ability piecemeal, but it is also provable in theory, in the low-down occasion of transmission error rates, as optical fiber communication, error correction is retransmitted in employing end to end just can obtain very satisfied result.Conventional ATM is operated under the fiber-optic communication environments, thereby it adopts end-to-end repeating transmission error correction method.Transmitting end to end is since a user terminal, and middle forwarding through several switches arrives another user terminal at last.Retransmitting in the error correction end to end, the place is not detected error of transmission at respective switch, thereby does not carry out retransmission process yet.Only error of transmission is detected,, send user terminal with regard to notice and retransmit, till correct reception if wrong at reception user terminal place.
But in some wireless network, transmission conditions are very abominable sometimes, and its general channel bit error rate is 10
-3To 10
-4, even be low to moderate 10 sometimes
-2At this moment, only adopt end-to-end repeating transmission error correction, performance is not ideal, can cause transfer of data (comprising the transmission of signaling) to be difficult to sometimes carry out.If adopt link repeating transmission error correction piecemeal, can cause voice cell transmission time-delay too big again.
In packet communication network in the past, all packets all are unified the processing.X.25 the packet switching network all adopts the repeating transmission error correction method of the packet one by one of link piecemeal to all packets.Internet (IP network) and asynchronous communication mode network (ATM net) then do not adopt the repeating transmission error correcting system of transmission link piecemeal to all packets, and adopt end-to-end repeating transmission error correcting system.In some more abominable wireless network of transmission conditions, when carrying out asynchronous communication mode, it is little to be difficult to both to have satisfied a part of cell requirement transfer delay, satisfies another part cell requirement zero defect again and transmits.
Summary of the invention
The objective of the invention is to propose a kind of information element transmission method, signaling and reliability of data transmission are improved, can not cause the transmission time-delay of real time business cell to increase again for solving the technical problem of realization integrated services communication under the abominable transmission environment.
The present invention proposes a kind of information element transmission method, it is characterized in that:
1) real-time sign is set in cell, to distinguish real time business cell and non-real-time service cell;
2) the non-real-time service cell is adopted the repeating transmission error correction method by cell of transmission link piecemeal.
The present invention also proposes, and in retransmitting error correction procedure, also can adopt the error correction method by the bit majority decision,
The present invention also can adopt and mix the method for retransmitting error correction and forward error correction that adopts the non-real-time service cell; Or the non-real-time service cell mix adopted forward error correction and by the repeating transmission error correction method of bit majority decision.To obtain more performance.
The present invention proposes the cell that difference requires is carried out the method for different disposal.In fact, different communication services is very different to the requirement that transmits the time-delay and the transmission error rate.Communication service such as phone, video conferencing is very little to transmitting delay requirement, but requires to hang down relatively to transmitting the error rate, can allow a spot of transmission error code.Common data service is comparatively loose to the requirement that transmits time-delay, but it requires no error code to transmit.Require to transmit the little communication service of time-delay cell will or few as far as possible with the method for retransmitting error correction, requires no error code to transmit and just can adopt by the repeating transmission error correction method that pursues cell of transmission link piecemeal the not high communication service cell of transmission delay requirement.Require to transmit some little communication services of time-delay, be referred to as real time business; And, be referred to as non-real-time service to transmitting some not high communication services of delay requirement.
The present invention proposes a kind of new ATM mode, can be called the ATM mode of service-oriented.In this new ATM mode, real time business is adopted three kinds of different processing modes with non-real-time service.To satisfy its short time delay requirement to real time business, generally not adopt the mode of retransmitting error correction, can adopt piecemeal transmission link by the repeating transmission error correcting system of cell, to satisfy its no misfeed requirement non-real-time service.In order to realize the differentiation of real time business cell and non-real-time service cell, the present invention proposes to be provided with a sign in real time in cell.Sign can be a bit in real time, also can be a kind of bit combination.At the receiving terminal of transmission link, determine whether the cell that receives is retransmitted error correction according to real-time sign.In order to reduce the mistake of real-time sign in transmission course, can carry out the forward error correction protection to the real-time sign in the cell.
In order to realize the repeating transmission error correction of non-real-time service cell, forward sequence number and reverse sequence number need be set in the non-real-time service cell, also to carry out the CRC coding to whole cell.Forward sequence number is used for the non-real-time service cell that sends is numbered in order.Oppositely sequence number is used for confirming to the opposite end the correct reception condition of non-real-time service cell.Sequence number length is generally got 3 bit to 7 bits.Below we get forward sequence number and oppositely sequence number be all 4 bits, as the course of work of example explanation first, second two places cell transmission.When first ground transmitting terminal sent the non-real-time service cell, cell of every transmission increased 1 with the forward sequence number in the cell, thereby forward sequence number is followed successively by 0 to 15, returned since 0.Receiving terminal on second ground is 0 cell if correctly received forward sequence number, just the reverse sequence number in the cell that is about in the transmitting terminal send is changed to 0, and it is 0 cell that meaning has correctly received forward sequence number with promptly notifying first ground second.If forward sequence number is that error code has taken place in transmission for 1 cell thereafter, then the reverse sequence number of second ground in the non-real-time service cell that first ground sends just is left 0, all correctly receives even forward sequence number subsequently is 2,3,4 cell.First ground finds that forward sequence number is that 1 cell does not obtain confirming, just sending forward sequence number to second ground again is 1 cell.If transmission is correct, second ground just will be made as 4 to the reverse sequence number in the cell that first ground sends, with show forward sequence number be 4 and before cell all correctly receive, requirement repeating transmission forward sequence number is 5 cell.Here, the cell number that does not obtain confirming that requires transmitting terminal to send must not be above 16.
In order to reduce the transmission error rate of forward sequence number and reverse sequence number, can adopt the forward error correction protected mode to forward sequence number and reverse sequence number.
In order further to improve the error correction effect, the present invention proposes again further to adopt the error correction method by the bit majority decision the non-real-time service cell being adopted in the repeating transmission error correction.Specific practice is such, if forward sequence number is 1 cell generation error of transmission, then spending some times, will to resend forward sequence number be 1 cell.If twice repeating transmission all makes a mistake subsequently, received that at this moment three forward sequence numbers are 1 cell sample.Just can adopt three to get two majority decision method, further carry out error correction.In other words, be that N the bit (having 3 N bits) of 1 cell compares mutually to three forward sequence numbers.If two be 1, the N bit of then declaring forward sequence number and be 1 cell is 1; If two be 0, the N bit of then declaring forward sequence number and be 1 cell is 0.By adopting error rate to have very big decline by the cell that obtains behind the bit majority decision.Certainly, also can wait and receive and adopt behind 5 cells that repeat to send 53 the majority decision methods of getting to come error correction.In like manner, can also adopt seven to get four, nine and get five .....
The present invention proposes forward error correction again and retransmits error correction method to combine, with further raising error correction effect.Forward error correction can adopt different error correcting codes such as BCH code, RS sign indicating number.Forward error correction can be carried out error correction to whole cell, also can be only the information field of cell be carried out error correction.These two kinds of error correction methods can combine like this.At receiving terminal, carry out forward error correction earlier, utilize the crc check cell whether transmission error code is arranged again.If error code is arranged, just correct by retransmitting.In retransmitting error correction, can adopt error correction method by the bit majority decision, also can not adopt error correction method by the bit majority decision.
These methods that the present invention proposes can be implemented in transmission error rates up to 10
-2The time still can guarantee ATM net operate as normal.
Embodiment
Embodiment:
The structure that realizes a kind of non-real-time service cell of the present invention can be expressed as follows: 2 bytes are Virtual Circuit Number, information field type and Cell Loss Priority sign, and the 3-4 byte is an error control coding of 2 bytes.Preceding four bits of the 5th byte are forward sequence number, four bits in back are reverse sequence number, the 1st bit of the 6th byte is the non real-time sign, back four bits of the 6th byte and the 7th byte are together as forward sequence number, the error control coding of reverse sequence number and non real-time sign, the 8th byte to the 55 bytes are as user data fields, and the 56th byte and the 57th byte are encoded as CRC, and the 58th to the 63rd byte is as the RS coding of user data fields and CRC byte.
The general error control reference book of implementation method of forward error correction and repeating transmission error correction all can be seen, and repeats no more.
The CRC coding is responsible for checking from the 1st byte to the 57 bytes whether error of transmission is arranged.The RS coding is responsible for correcting the transmission error code in the 8th byte to the 63 bytes.Here, used forward error correction coding altogether three times.For the first time being correct four bytes, is to the 5th to the 7th byte for the second time, is to the 8th to the 63rd byte for the third time.At receiving terminal, carry out this three forward error corrections earlier, with the crc check cell whether error of transmission is arranged then.If wrong, just adopt foregoing repeating transmission error correction method to carry out error correction.
Claims (4)
1, a kind of information element transmission method is characterized in that:
1) real-time sign is set in cell, to distinguish real time business cell and non-real-time service cell;
2) the non-real-time service cell is adopted the repeating transmission error correction method by cell of transmission link piecemeal.
2, information element transmission method as claimed in claim 1 is characterized in that, retransmits the error correction method that adopts in the error correction procedure by the bit majority decision at this.
3, information element transmission method as claimed in claim 2 is characterized in that, to this non-real-time service cell, mixes the method for retransmitting error correction and forward error correction that adopts.
4, information element transmission method as claimed in claim 2 is characterized in that, this non-real-time service cell is mixed the repeating transmission error correction method that adopts forward error correction and pursue the bit majority decision.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00103361 CN1119885C (en) | 2000-03-03 | 2000-03-03 | Information element transmission method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00103361 CN1119885C (en) | 2000-03-03 | 2000-03-03 | Information element transmission method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1263392A CN1263392A (en) | 2000-08-16 |
| CN1119885C true CN1119885C (en) | 2003-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00103361 Expired - Fee Related CN1119885C (en) | 2000-03-03 | 2000-03-03 | Information element transmission method |
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| CN (1) | CN1119885C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2376857B (en) * | 2001-06-22 | 2003-07-23 | Motorola Inc | Proxy server and method for delivering information in a multimedia communication system |
| CN100395973C (en) * | 2002-12-06 | 2008-06-18 | 中国电子科技集团公司第三十研究所 | High-reliability cipher synchronizing method in mobile communication |
| KR100498932B1 (en) * | 2002-12-30 | 2005-07-04 | 삼성전자주식회사 | Apparatus and method for session establishment in radio network organized mobile nodes |
| EP2003868A1 (en) * | 2007-06-11 | 2008-12-17 | Koninklijke KPN N.V. | Setting up a connection via an interconnection between different networks |
| CN101494449B (en) * | 2008-12-19 | 2011-02-02 | 清华大学深圳研究生院 | Excitation type pulse generator |
| CN104683023B (en) * | 2013-12-03 | 2018-02-13 | 华为技术有限公司 | Method, equipment and the system of fast quick-recovery after a kind of FCoE network packet loss |
-
2000
- 2000-03-03 CN CN 00103361 patent/CN1119885C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1263392A (en) | 2000-08-16 |
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