CN1116755C - Transmission packets of same length but different structure - Google Patents
Transmission packets of same length but different structure Download PDFInfo
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- CN1116755C CN1116755C CN98804529.XA CN98804529A CN1116755C CN 1116755 C CN1116755 C CN 1116755C CN 98804529 A CN98804529 A CN 98804529A CN 1116755 C CN1116755 C CN 1116755C
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- sequence
- grouping
- information sequence
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/40—Network security protocols
Abstract
The invention concerns a device adapted to send transmission packets of predetermined length, comprising means for formatting a first type of packets (B1) based on a first preamble (TS1) and a first data sequence (IS1). In order to transmit a second data sequence (IS2) longer than the first (IS1), the formatting means (F) are equally arranged for formatting a second type of packet (B2) based on a second preamble (TS2) shorter than the first (TS1) and the second data sequence (IS2), said means (F) formatting a packet whereof the type is identified by an identification signal (Id). The invention also concerns a device adapted to receive transmission packets compatible with said device.
Description
The transmitted in packets of the length limited system of the present invention relates to, these groupings have different structures.
FIELD OF THE INVENTION is typical digital communicating field, and for the information that transmits from transmitted from transmitter to receiver, it requires to transmit with packet mode.We under the circumstances, such grouping is by an initiation sequence and an information sequence form, and need not judge these sequences separately position in grouping.Especially, initiation sequence can be positioned at head, and (thereby we are called " preposition "), but it also can be in the centre (thereby being exactly " middle part ") of grouping.The symbol institute form that this initiation sequence is all known by transmitter and receiver.It particularly is received the pulse reply that machine is used to obtain synchronously and be used to estimate the transmission channel that links to each other with transmitter.The pulsion phase of this estimation should will can be used for the symbol of demodulating information sequence, and this information sequence hypothesis is unknown.
An exemplary of such grouping is in GSM cellular digital wireless communication system.In fact also have an access grouping that is named as " RACH ", it is sent out when it is connected into network by terminal.This is grouped in GSM 04.6 suggestion and is prescribed, and it has the length of fixing 85 symbols or bit.It comprises the initiation sequence of one 49 bit and the information sequence of one 36 bit.Information sequence is obtained since the word of one 8 bit.Parity-check operations is used on this word, and it produces the sequence of 6 bits.We are by connecting the word of 8 bits, and the predefine bit that the parity sequences of 6 bits and 4 are called as tail bits obtains the message of one 18 bit.Next message carry out 1/2 ratio convolutional encoding to provide information sequence.Top whole information protection operation is the integrality that is used to protect 8 bit words, produces the accidental difference that occurs in preventing to transmit.
Along with the improvement of system, under the situation of RACH grouping, the group capacity that 8 bit informations may occur is not enough to guarantee correct business.On this improved meaning, be actually hope and can add for example priority, the needed binary system flow of communication, data such as the operational mode of terminal, these data can not be expressed in 8 original bit words.
We know clearly that very this improvement must guarantee minimum cost, that is to say the infrastructure that changes terminal as few as possible on material and this one-level of software.Therefore, normal step is the structure that keeps grouping, that is to say the total length of initiation sequence and grouping, and total length has caused the direct technology constraint relevant with system.In this idea, many solutions are for example by 8 bit transitions are increased group capacity to 11 bits, and do not change information sequence length, and length is 36 bits in this case.
First kind of solution is to take new coding to produce the sequence of 36 bits with the information from 11 bits.This scheme is unsafty, because it must be settled new encoder and settle new decoder in receiver in transmitter.
Second kind of solution is disclosed in document " TDoc SMG2 GPRS 116/96 ", and it is published in the ETSISMG2 GPRS AdHoc meeting of holding in Stockholm 16 to 18 October in 1996.According to the document, we also 4 bit tail after carrying out parity check and configuration information 11 bit sequences on 6 bits form the message of 21 bits.This message is carried out convolutional encoding, and this coding has been applied to the word of 8 bits to obtain the information sequence of 42 bits.Therefore, the sequence of this 42 bit must be reverted to the sequence of 36 bits so that can be inserted in the grouping.For this reason, we use the known technology be called as perforation, that is to say that per 7 bits of information sequence cancel 1 bit.This scheme has the advantage that transmitter is changed minimum.Yet, at receiving terminal, consider each for these bits, its two possible binary values all are equiprobable, therefore must introduce 6 bits that have been cancelled again, this will realize before decoding.Consequently for the coding efficiency of correcting error of transmission has been lowered, this has just caused the deterioration that receives error rate.
The third solution is disclosed in document " TDoc SMG2 GPRS 170/97 ", and it is published in the ETSI SMG2GPRS AdHoc meeting of holding in the Stuttgart 22 to 24 January in 1997.According to the document, we still carry out parity-check operations on 6 bits, but we only keep a bit in the 4 original tail bits, obtaining the message of one 18 bit, we to the convolutional encoding of its application of known so that produce the information sequence of 36 bits.This scheme is compared with the resulting result of the last scheme of use and has been improved error rate, yet, cancel some declines that 3 end bit have still been brought the error corrector coding efficiency.
Therefore the purpose of this invention is to provide a kind of grouping with second type, it is compatible mutually with previously defined first type grouping aspect transmission, has than first type of more jumbo grouping of second type to be used to the decline that reduces the change that brings to distinct device and be used for reducing as far as possible receptivity.
According to invention, the equipment that is used for the transmission of predefine length transmission grouping comprises the checker-work that is divided into groups by first initiation sequence and the first information Format Series Lines first kind, its difference is, for sending second information sequence longer than first information sequence, checker-work to be arranged equally with by second initiation sequence and second information sequence form second type packet shorter than first initiation sequence, these install format packets, and its type is identified by id signal.
Simultaneously, invention also provides an equipment that is used for the reception of predefine length transmission grouping; The grouping that is received can be the first kind or second type, and comprise first and second initiation sequences respectively and comprise first and second information sequences respectively, second information sequence is longer than first information sequence, and this equipment comprises the selection signal that is used for responding this packet type of the identification device from the grouping separate information sequence that receives.
In the case, people make information sequence preferentially be unfavorable for initiation sequence.The information sequence of second type packet is sent out under the situation that does not have change, although we have kept the performance that first kind grouping is obtained in this.In fact initiation sequence reduces to have brought some defectives, mainly be that the empty detection risk of grouping increases (receiver thinks that grouping is received when not in situation), and given transmission channel impulse response estimation is than not too the significant bits estimation of setting up is poor from some.So initiation sequence is set to very big yardstick usually to guarantee the optimum operation of receiver.Therefore, if this sequence reduce to be in a suitable limit, the suffered influence of performance can be ignored.Generally speaking, can provide desired services under the condition that is grouped in of second type.
In addition, the equipment that is used to launch comprises single code device, to produce first and second information sequences respectively from first and second message.
Simultaneously, at the equipment that is used for receiving, the information sequence of different grouping is produced by the coding of same essence, and this equipment comprises that single decoding device is to decode to first and second information sequences.
Be that same coding is used in two types of groupings, we have limited the change of transmitter and receiver.
The present invention mainly is applicable to when second information sequence includes the information of Duoing than first information sequence.
According to first selection, second initiation sequence is corresponding to a subsequence of first initiation sequence.
Therefore, better, second initiation sequence is corresponding to a subsequence of first initiation sequence, and the equipment that is used to receive comprises the grouping of single demodulating equipment with two types of demodulation.
Here, we have limited the change of receiver.
According to second kind of selection, the initiation sequence of second length l is substantially normal to the subsequence of the first initiation sequence length l.
In the case, we have reduced the danger disturbed between two dissimilar groupings significantly, are transmitted simultaneously if these groupings are accidental.
The present invention will be described in detail in the scope of specification, and specification provides embodiment with reference to the accompanying drawings, and accompanying drawing is represented:
-Fig. 1 is used for the equipment that second type packet sends according to invention,
-Fig. 2 is used to receive the equipment of this grouping.
The parts that occur in two accompanying drawings will use unique and identical numbering.
Therefore invention has two kinds of compatible mutually aspect transmission packet types, that is to say same length.
With reference to Fig. 1, equipment is used for allowing transmitting the one 8 bit data word W1 by first kind transmission grouping.This first word W1 is sent to the first processing module P1, and this module begins to calculate from 8 bits of this data word represents parity function with 6 bits.This module connects 8 bit words, and 6 Parity Check Bits and 4 predefine bits that are called as end bit are to form the first message M1.
Similarly, the second data word W2 of 11 bits is used for being transmitted by second type packet.When this grouping of transmission, this second word W2 is sent to the second processing module P2, and this module is calculated and represented another parity-check operations with 6 bits equally.Second module connects 11 bit words, and 6 Parity Check Bits and above-mentioned 4 end bit are to form the second message M2.
The control circuit (not shown) that the transmitter of equipment is installed produces an id signal Id, and it shows whether to handle the first kind grouping or second type packet to this equipment.
Therefore device also comprises a coding mechanism COD, and it selects the first message M1 respectively according to the state of id signal Id, and the second message M2 is to produce first information sequence IS1 respectively by 1/2 ratio convolutional encoding respectively, the second information sequence IS2.As an example, this mechanism can have the circuit form that is used for this encoding operation. and in addition, the person of ordinary skill in the field will be expressly understood very whether this relates to the best embodiment of invention, even at two message M1, the last applied coding of M2 is different, and this can use too.
Equipment also comprises a F of form mechanism.When id signal Id showed that the grouping that will launch is the first kind, this mechanism was with the first initiation sequence TS1 of 49 bits with from the first message M1 of 36 bits of coding mechanism COD and put, to produce first kind grouping B1.If it is second type that id signal Id shows the grouping that will launch, the F of form mechanism is with the second initiation sequence TS2 of 43 bits with from the second message M2 of 42 bits of coding mechanism COD and put, to produce the second type packet B2.
Invention also has another equipment so that in receiver, handle the grouping that is received, the grouping or the first kind or second type.
With reference to figure 2, this equipment comprises a D of testing agency, and it receives grouping B, and the type of grouping is by selecting signal Sel to be identified.
This back one signal Sel is provided by the controlling organization (not shown) of the receiver of the equipment of arrangement.As an example, grouping that will be received on first channel of this controlling organization and the grouping that is received on second channel combine.
The D of testing agency is the first grouping B1 or the second grouping B2 according to what select signal Sel identification, carries out relevant to the grouping that is received with the first initiation sequence TS1 or the second initiation sequence TS2 according to the first initiation sequence TS1 or the second initiation sequence TS2 in known manner.This associative operation can obtain especially to that is to say and orient the sequence that is received in the grouping that is received synchronously that this sequence is corresponding to the information sequence of emission time institute's form.The sequence S1 that this mechanism provides for the first demodulator DEM1 to be received among the first kind grouping B1 or the sequence S2 that is received among the second type packet B2 is provided to the second demodulator DEM2.Further, testing agency carries out transmission channel impulse response estimation equally, to send it to related demodulator behind the packet type that is received considering.This estimation realizes according to the known technology that for example is called as least square.
Respectively from the receiving sequence S1 of correspondence, S2 demodulates the first information sequence IS1 or the second information sequence IS2 to the one DEM1 demodulator as the 2nd DEM2 demodulator.
Equipment also comprises a single DEC of decoding mechanism, because used the one and same coding device for different information sequences in the present embodiment.Therefore this mechanism receives the first information sequence IS1 or the second information sequence IS2, to demodulate the first message M1 or the second message M2 respectively.According to circumstances, by person of ordinary skill in the field's known method, demodulate the first data word W1 or the second data word W2 from the first message M1 or the second message M2 respectively.
A most preferred embodiment of invention is as select the second initiation sequence TS2 corresponding to the subsequence of the first initiation sequence TS1, that is to say, in this example, cancel preceding 6 bits of this first sequence TS1,6 bits in back or more generally preceding n bit and back (6-n) individual bit, n is the integer between 0 to 6 here.In this case, the D of testing agency is associated the grouping that is received with the first initiation sequence TS1, no matter and the packet type that is received.This scheme has the advantage of the change that reduces receiver, and it will be used for when it is used the decreased performance brought and keeps within the acceptable range by special recommendation.
When invention may occur two types of groupings accidentally in the applied system and exists simultaneously, another embodiment had intrinsic advantage.In this case, can select the second initiation sequence TS2 of length l, so that it can be orthogonal to the different subsequences of the length l of the first initiation sequence TS1.Handle like this, we just can reduce because the difficulty that interference brought that may occur between the grouping B2 of the grouping B1 of the first kind and second type.
Up to the present inventing applied example all is two types the grouping that belongs to different capabilities, that is to say the data word institute form by different length.This needn't regard the restriction for invention as.As an example; we can exemplify this situation; because protection sequence (Parity Check Bits, tail bits and convolution code) can not satisfy the function that it is chosen with enough fail safes, so the first kind that original system had grouping can not be satisfied predetermined service suitably.Increase the protection of data word so wish bit by additional.This has got back to the corresponding information sequence of increase and has not changed on the data word.
Therefore the present invention can be employed by various numerous variations, and these variations can not be listed one by one.
Claims (8)
1. one kind is used for the equipment that a predefine length is transmitted the transmission of grouping, comprise checker-work by first initiation sequence (TS1) and first information sequence (IS1) form first kind grouping (B1), it is characterized in that, for sending second information sequence (IS2) longer than first information sequence (IS1), described checker-work (F) is also by second initiation sequence (TS2) and described second information sequence (IS2) form second type packet (B2) shorter than first initiation sequence (TS1), these devices (F) format packets, its type is identified by id signal (Id).
2. equipment according to claim 1 is characterized in that it comprises that single code device (COD) is to produce described first (IS1) and second (IS2) information sequence from first (M1) and second message (M2) respectively.
3. one kind is used for the equipment that a predefine length is transmitted the reception of grouping, it is characterized in that the grouping or the first kind (B1) or second type (B2) that are received, and comprise first initiation sequence (TS1) and second initiation sequence (TS2) and first information sequence (IS1) and second information sequence (IS2) respectively, second information sequence (IS2) is longer than first information sequence (IS1), this equipment comprises that also being used for response discerns this grouping (B1, B2) the selection signal (Se1) of type separate information sequence (IS1 from described received reception grouping (B), IS2) device (D, DEM1, DEM2).
4. equipment according to claim 3, it is characterized in that different grouping (B1, information sequence B2) (IS1, IS2) coding by same essence produces, and this equipment comprises that single decoding device (DEC) is to decode to described first (IS1) and described second information sequence (IS2).
5. equipment according to claim 2 is characterized in that above-mentioned code device (COD) is used for producing described second information sequence (IS2) that comprises the information of Duoing than described first information sequence (IS1).
6. equipment according to claim 1 and 2 is characterized in that above-mentioned checker-work (F) is used for described second initiation sequence (TS2) form second type packet (B2) corresponding to a subsequence of described first initiation sequence (TS1).
7. according to the described equipment in one of claim 3 or 4, it is characterized in that described second initiation sequence (TS2) of its reception corresponding to a subsequence of described first initiation sequence (TS1), above-mentioned separate information sequence (IS2, IS2) device comprises single demodulating equipment (DEM1, DEM2) (B1 B2) carries out demodulation with the grouping to two types.
8. according to claim 1, one of 2 or 5 described equipment, it is characterized in that above-mentioned checker-work (F) be used for the length with described first initiation sequence (TS1) be 1 subsequence basically the described length of quadrature be 1 second initiation sequence (TS2) form second type packet (B2).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR97/04039 | 1997-03-28 | ||
| FR9704039A FR2761558B1 (en) | 1997-03-28 | 1997-03-28 | TRANSMISSION PACKETS OF SAME LENGTHS AND DIFFERENT STRUCTURES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1253687A CN1253687A (en) | 2000-05-17 |
| CN1116755C true CN1116755C (en) | 2003-07-30 |
Family
ID=9505457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98804529.XA Expired - Fee Related CN1116755C (en) | 1997-03-28 | 1998-03-27 | Transmission packets of same length but different structure |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1013046A1 (en) |
| CN (1) | CN1116755C (en) |
| BR (1) | BR9807897A (en) |
| FR (1) | FR2761558B1 (en) |
| WO (1) | WO1998044692A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10686656B2 (en) * | 2015-09-15 | 2020-06-16 | Signify Holding B.V. | Provisioning a wireless device without keypad |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5020055A (en) * | 1989-06-23 | 1991-05-28 | May Jr Carl J | Multi-length packet format including fixed length information words |
| US5243595A (en) * | 1990-01-30 | 1993-09-07 | Johnson Service Company | Combined connectionless and connection-oriented network control system |
| FI108975B (en) * | 1993-03-09 | 2002-04-30 | Nokia Corp | Exercise sequence in a digital cellular radio telephone system |
-
1997
- 1997-03-28 FR FR9704039A patent/FR2761558B1/en not_active Expired - Fee Related
-
1998
- 1998-03-27 WO PCT/FR1998/000626 patent/WO1998044692A1/en not_active Application Discontinuation
- 1998-03-27 BR BR9807897-6A patent/BR9807897A/en not_active IP Right Cessation
- 1998-03-27 EP EP98917254A patent/EP1013046A1/en not_active Withdrawn
- 1998-03-27 CN CN98804529.XA patent/CN1116755C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| FR2761558B1 (en) | 1999-09-24 |
| EP1013046A1 (en) | 2000-06-28 |
| CN1253687A (en) | 2000-05-17 |
| WO1998044692A1 (en) | 1998-10-08 |
| FR2761558A1 (en) | 1998-10-02 |
| BR9807897A (en) | 2000-02-22 |
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