CN1243369A - Signal coding method and data transmission system in data transmission system - Google Patents
Signal coding method and data transmission system in data transmission system Download PDFInfo
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- CN1243369A CN1243369A CN99108869A CN99108869A CN1243369A CN 1243369 A CN1243369 A CN 1243369A CN 99108869 A CN99108869 A CN 99108869A CN 99108869 A CN99108869 A CN 99108869A CN 1243369 A CN1243369 A CN 1243369A
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Abstract
The invention relates to a data transmission system and method for encoding a signal to be transmitted in a data transmission system, the method allowing data to be transmitted at various different transmission rates, data being transmitted in the method in frame format, the frames (100) also comprising information about the used transmission rate, conveyed by means of control bits, the control bits being encoded by using a biorthogonal coding to provide encoded bits. To allow the transmission rate used in a frame to be flexibly indicated, the used biorthogonal coding depends on the number of the different transmission rates and the encoding is selected so that the number of encoded bits remains constant.
Description
The present invention relates to data transmission system and unify and be used for being coded in the method for the signal that this data transmission system will transmit, make it to send data with various transmission rate.Form with frame sends data, and this frame also comprises the information of used transmission rate.The present invention relates to represent the enforcement of coding of the control bit of transmission rate.
Constantly increasing, particularly for the wireless system for transmitting data such as cellular radio system, expectation increases provides all business for the requirement of data transmission system, for example, and various data and video traffic.
Usually wireless system for transmitting data only is used for the transmission of language.The increase of the miscellaneous service amount of transmitting means that in specific wireless system system must transmit the signal of different capabilities on radio path, for example, and the data of the language of the data transfer rate of 8Kbit/s and 64kbit/s speed.In addition, need the signal of the different quality of transmission seeervice level, sort signal also needs different transmission rates usually simultaneously.A typical example can enumerating is that video connects, and image wherein needs high message transmission rate and high service quality, and sound then can transmit with lower speed and lower service quality.Therefore, a data transmission system should be able to can be carried out various different pieces of information transmission rates therein, works effectively in the environment of the quality of seeervice level and the transmission of type service.
In specific digital data transmission system, the form with frame sends signal usually.In many cases, a frame can be further divided into a plurality of time slots.In these systems, transmission rate that can be different sends data for any given used transmission rate of transmission unit, and must be managed to detect by receiver be a frame or a time slot.A solution is to send clear and definite control information to receiver, to represent the transmission rate of each transmission unit.
Fig. 1 represents the typical time slot 100 of of prior art frame.A time slot generally includes one or more sections 102-106 that transmit various control informations, such as pilot signal 102, and power control information 104 and the control bit that is illustrated in message transmission rate used in this frame.This time slot is the section of comprising 108 also, transports actual information.Time slot is transmitted on transmission channel as an independent physical packets, and the control information section is transmitted on the logic channel that separates.In this example, the section 102-106 of transmitting control information transmits on logical control channel, and the section 108 of transmission real data is transmitted on logical data channel.
The size of the time slot of communicating control information is limited.A kind of known method of representing the message transmission rate that each time slot is used is by using bi-orthogonal codes to come code rate information (RI) position, using the Walsh function and shine upon these positions.The let us hypothesis, for example the number of RI position is NRI.Therefore they can be used for expression
Individual different transmission rate, the let us hypothesis, for example, NRI=6.Use (32.6) bi-orthogonal coded in this situation, i.e. 32-position Walsh function, so their complement of two's two's complement provides 64 code words.Therefore, this RI section is occupied 32 in frame, so can be used for representing 64 different transmission rates.
Common target be keep each time slot the control figure place seldom.If a large amount of transmission rates is arranged, or their number change is very big, then represents that with the RI position of limited quantity transmission rate is inconvenient for the method for prior art.One very natural alternative be to introduce new code word, that is, the quantity of this RI is increased to 12.Yet this will change structure of time slot, and this is undesirable, because actual data will have less space, will cause significant variation to system.In addition, change transmission rate the quantity of RI position is optionally increased, wasted the time slot capacity.
The purpose of this invention is to provide a kind of method, thereby can solve the problem in the above-mentioned expression transmission rate.The inventive method with the signal that is used for being coded in data transmission system has reached this purpose, this method allows to send data with various transmission rate, send data with frame format in the method, this frame also comprises the information of used transmission rate, transmit by control bit, use bi-orthogonal coded these control bits of encoding, so that bits of coded to be provided.Method of the present invention is characterised in that; Used bi-orthogonal coded depends on the quantity of different transmission rates; Select this coding that the number of bits of coded is remained unchanged.
The feature of method of the present invention also is: the quantity of determining available transmission rate; Determine the quantity of required control bit according to the quantity of this transmission rate; Determine used bi-orthogonal coded according to the quantity of this control bit; With selecting to encode the quantity of bits of coded is remained unchanged.
The invention still further relates to a kind of data transmission system, permission sends data with various transmission rate, in system, send data with frame format, this frame also comprises the information about used transmission rate, transmit by control bit, use bi-orthogonal coded these control bits of encoding, so that bits of coded to be provided.System of the present invention is characterised in that: used bi-orthogonal coded depends on the quantity of different transmission rates in system; Select employed coding that the quantity of bits of coded is remained unchanged.
The feature of system of the present invention also is: the quantity of determining transmission rate available in system; Determine the quantity of required control bit according to the quantity of this transmission rate; Quantity according to this control bit is selected used bi-orthogonal coded; Select this coding so that the quantity of bits of coded remains unchanged.
Be disclosed in the dependent claims most preferred embodiment of the present invention.
Method and system of the present invention provides multiple advantage.Because coding is adaptive, thus suitable just control bit quantity can be selected, thus the control bit that allows coding remains unchanged frame structure itself in the frame structure that is provided.
The present invention is described below with reference to the accompanying drawings in more detail, wherein:
Fig. 1 represents an example of the transfer of data time slot described;
Fig. 2 represents to use an example of data transmission system of the present invention;
Fig. 3 represents an example of the transmitter of this data transmission system;
One example of Fig. 4 presentation code;
Fig. 5 a and 5b represent the use of two code words; With
Another example of Fig. 6 a and 6b presentation code.
Fig. 2 represents to use the present invention program's digital data transmission system.This system is the part of cellular radio system, comprises base station 200, has the two-way connection 202-206 to user terminal 208-212.This base station is also communicated by letter with base station controller 214, and the latter is transferred to user terminal the other parts of network.Example as a used digital data transmission system is a cellular radio system, below description is applied to the situation of cellular radio system, but is significantly for those skilled in the art, and this never is a limitation of the present invention.Also the present invention can be applied to other system.
User terminal in the let us supposing the system can various message transmission rate send information according to the data transmission capacity under each situation.Fig. 3 is the block diagram of the possible structure of the expression transmitter of implementing the present invention program.This transmitter comprises one group of data source 300-304, and for example being provides for language transmission or for different data, services.In these data sources, information is carried out chnnel coding.Signal 306-310 in these sources frame format, their message transmission rate differs from one another.This transmitter also comprises a switch or multiplexer 312, and its is selected or connects signal from one or more current valid data source to code device 314.The operation of the other parts of control device 316 these switches of control or multiplexer 312 and transmitter.Adopt processor can implement this control and code device 314,316 easily by software.The signal 318 that leaves code device 314 is a kind of frame formats.In code device 314, by use repeating or mobile coding can be installed to the message transmission rate from the signal of data source in the frame adaptively.Should point out that the transmitter among Fig. 3 includes only the basic element of character of describing into the present invention, real transmitter also comprises other parts, such as filter and amplifier, it is known to those skilled in the art that, does not describe here for clear.
Therefore, code device 314 produces the frame that will send, and control bit is added in this frame.The RI position that is illustrated in message transmission rate used in this frame also is added in this frame.In the solution of the present invention, the chnnel coding of this RI position depends on the quantity of this RI position.Will be with reference to figure 4,5a and 5b inquire in more detail to this.
By using bi-orthogonal coded, that is, use the Walsh function and shine upon these positions rate information (RI) position coding.The quantity of let us hypothesis RI position is N
RITherefore available their expressions
Individual different transmission rate.Let us hypothesis, for example N
RI=6.Adopt (32.6) bi-orthogonal coded in this situation, i.e. 32-position Walsh function, so their complement of two's two's complement provides 64 code words.Therefore this RI section has taken 32 in this frame, so it can be used to represent 64 different transmission rates.In Fig. 4, represented this, wherein shone upon this RL position 400 significantly by 32-position Walsh function 402.
If have manyly than the 6RI position, it is impossible not having the method shown in the variation diagram 4 of frame structure, and the variation of its frame structure is the length that control section is expanded to 2 * 32=64 position.In solution of the present invention, avoided this shortcoming by the bi-orthogonal coded that changes this RI position.When the length with this Walsh function for example shortens to 16, then, can represent 10 RI positions with 32-position section by (16.5) bi-orthogonal coded.In this situation, shine upon this RI position by two 16-position Walsh functions.In addition, if 11-16 RI position arranged, then the length of this Walsh function can be defined as 8.This provides 48 bit word.Following table has been represented different substituting.
| The quantity of RI position | Walsh function length | The quantity of the code word of every frame |
| ????1-6 | ????32 | ????1 |
| ????7-10 | ????16 | ????2 |
| ????11-16 | ????8 | ????4 |
Let us is at length inquired into the situation of 7-10RI position, therefore can shine upon these positions by (16.5) bi-orthogonal coded, use two 16-bit word, or the Walsh function is shone upon these RI positions.Can in a different manner this RI position be assigned in the code word as shown in Fig. 5 a and 5b.In the example shown in Fig. 5 a, the control bit that will encode is assigned in the different code words by this way, that is, use first code word to encode position as much as possible, and last code word is used for remaining position.Frame 500 in Fig. 5 a comprises 7 coding RI positions, and frame 502 comprises 8 coding RI positions, and frame 504 comprises 9 coding RI positions, and frame 506 comprises 10 coding RI positions.Another selection is that these are assigned in the different code words shown in Fig. 5 b equably.In Fig. 5 b, frame 508 comprises 7 coding RI positions, and frame 510 comprises 8 coding RI positions, and frame 512 comprises 9 coding RI positions, and frame 514 comprises 10 coding RI positions.This is more complicated a little enforcement, but provides more performance with the 7-9 position.The reason of improving performance is, because do not use all various combinations that can get in coding, so can select this Walsh function, makes decoding error minimum.
Fig. 6 a and 6b further represent a kind of forced coding of this RI position.If 1-6 RI position arranged, operate according to Fig. 6 a, wherein encode by 602 contrapositions 600 of biorthogonal (32.6) coding, then this bits of coded 604 is mapped to physical channel.If the 7-10RI position is arranged, then operate according to Fig. 6 b, wherein encode by 606 contrapositions 600 of biorthogonal (16.5) coding, then, this bits of coded is interlocked 608, after this interleaved bits 610 is mapped to physical channel.As can be seen, described staggered just example, substituting of other also is possible.
Although the case description above shown in conjunction with the accompanying drawings the present invention, clearly the present invention is not limited to this, within the disclosed inventive concept of appended claims many variation patterns can be arranged.
Claims (8)
1. method that is used for being coded in the signal that data transmission system will transmit, this method allows to send data with multiple different transmission rate, send the information that these frames of data (100) also comprise used transmission rate with frame format in the method, transmit by control bit (106), use bi-orthogonal coded to these control bit codings, so that bits of coded to be provided, it is characterized in that: used bi-orthogonal coded depends on the quantity of different transmission rates; Select this coding so that the quantity of bits of coded remains unchanged.
2. method that is used for being coded in the signal that data transmission system will transmit, this method allows to send data with multiple different transmission rate, send data with frame format in the method, this frame (100) also comprises the information about used transmission rate, transmit by control bit (106), use bi-orthogonal coded to these control bit codings,, it is characterized in that so that bits of coded to be provided:
Determine the quantity of available transmission rate;
Determine the quantity of required control bit according to the quantity of this transmission rate;
Determine used bi-orthogonal coded according to the quantity of this control bit; With
Select this coding so that the quantity of bits of coded remains unchanged.
3. according to the method for claim 1 or 2, it is characterized in that the control bit encoding context, use the code word that produces by the Walsh function and their complement of two's two's complement to shine upon these control bits.
4. according to the method for claim 3, it is characterized in that: when the quantity by the control bit of used code word mapping increases De Taigao, the length of code word used in the coding is reduced by half, and by using a plurality of code words to shine upon these control bits.
5. according to the method for claim 4, it is characterized in that: the control bit that will encode is assigned in the different code words equably.
6. according to the method for claim 4, it is characterized in that: the control bit that will encode is assigned in the different code words in this wise,, uses first codeword coding position as much as possible that is, and last code word is used for remaining position.
7. a permission sends the data transmission system of data with multiple different transmission rate, in this system, send data with frame format, this frame (100) also comprises the information of used transmission rate, transmit by control bit (106), use bi-orthogonal coded to these control bit codings, so that bits of coded to be provided, it is characterized in that: used bi-orthogonal coded depends on the quantity of different transmission rates; Select this coding so that the quantity of bits of coded remains unchanged.
8. a permission sends the data transmission system of data with multiple different transmission rate, in this system, send data with frame format, this frame (100) also comprises the information of used transmission rate, transmit by control bit (106), use bi-orthogonal coded that these control bits are encoded so that bits of coded to be provided, it is characterized in that:
In system, determine the quantity of available transmission rate;
Determine the quantity of required control bit according to the quantity of this transmission rate;
Quantity according to this control bit is selected used bi-orthogonal coded;
With select this coding so that the quantity of bits of coded remains unchanged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN99108869A CN1243369A (en) | 1998-06-22 | 1999-06-22 | Signal coding method and data transmission system in data transmission system |
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| FI981435 | 1998-06-22 | ||
| CN99108869A CN1243369A (en) | 1998-06-22 | 1999-06-22 | Signal coding method and data transmission system in data transmission system |
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| CN99108869A Pending CN1243369A (en) | 1998-06-22 | 1999-06-22 | Signal coding method and data transmission system in data transmission system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1812314B (en) * | 2005-01-24 | 2010-05-05 | 中兴通讯股份有限公司 | Data with different rate group frame transmitting method and device |
| CN102017558A (en) * | 2008-03-03 | 2011-04-13 | 三星电子株式会社 | Method for encoding control information in a wireless communication system, and method and apparatus for transmitting and receiving the control information |
-
1999
- 1999-06-22 CN CN99108869A patent/CN1243369A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1812314B (en) * | 2005-01-24 | 2010-05-05 | 中兴通讯股份有限公司 | Data with different rate group frame transmitting method and device |
| CN102017558A (en) * | 2008-03-03 | 2011-04-13 | 三星电子株式会社 | Method for encoding control information in a wireless communication system, and method and apparatus for transmitting and receiving the control information |
| CN102017558B (en) * | 2008-03-03 | 2014-07-09 | 三星电子株式会社 | Method for encoding control information in a wireless communication system, and method and apparatus for transmitting and receiving the control information |
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