CN1655488B - Method for increasing interleaving time in radio communication systems - Google Patents
Method for increasing interleaving time in radio communication systems Download PDFInfo
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- CN1655488B CN1655488B CN2004100392729A CN200410039272A CN1655488B CN 1655488 B CN1655488 B CN 1655488B CN 2004100392729 A CN2004100392729 A CN 2004100392729A CN 200410039272 A CN200410039272 A CN 200410039272A CN 1655488 B CN1655488 B CN 1655488B
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Abstract
This invention provides a wireless communication system interlace time increasing method, which comprises the following steps: separating the transmission data in each frame within the interlace time into n blocks of data; then re-aligning the data, wherein the first data block in the first group is transported within the first group; the second data block in the first group is transported withinsecond frame till the n blocks transportation is finished within n frames in the first group.
Description
(1) technical field
The present invention relates to the data transmission method in a kind of wireless communication system, be used for overcoming of the influence of wireless communication system wireless channel for the burst error (Burst Error) that data transmission procedure brought.More particularly, relate to the method that increases interweave the time (Interleaving Time) in a kind of wireless communication system, use the method among the present invention, the performance of opposing wireless channel burst error influence in the time of can improving data and in wireless channel, transmit, thus the gain of signal to noise ratio (Signal to Noise Ratio) obtained.
(2) background technology
In some 3G communication technology standards, in order to reduce the influence of burst error, one of means of often taking are exactly that the data of transmission are done to interweave, and for example the frame or the data in the subframe of some are done to interweave.Interleave depth (Interleaving Depth) is meant the quantity of the data of the physical transfer that comprises in an interleaving data piece, for example symbol (symbol) or bit (bit) quantity.Another notion of Xiang Lianing is the time T that interweaves therewith, is meant the poor of time that the time of occurrence of first data in an interleaving data piece and last data occur.In general, interleave depth is big more, i.e. the data that participation interweaves are many more, and the time that interweaves is also long more, and burst error is just more little to the harmful effect of communication system.
In existing TD-SCDMA (Time Division-Synchronized Code Division Multiple Access) wireless communication standard system, defined two kinds of Radio Access Networks (Radio Access Network) technical standard, be called TSM (TD-SCDMA Systemfor Mobile) and LCR (Low Chip Rate), wherein the TSM standard provides a kind of Radio Access Network technology of supporting that second generation mobile communication system seamlessly transits to 3-G (Generation Three mobile communication system), be operated under GSM (the Global System for Mobile communications) network architecture, it carried out standardization effort by CCSA (Chinese Communication Standard Association) standardization body; The LCR standard provides a kind of Radio Access Network technology of 3-G (Generation Three mobile communication system), is operated under UTRAN (the UMTS Terrestrial Radio Access Network) network architecture, by 3GPP (3
RdGeneration Partner Project) standardization body carries out standardization effort to it.
In above-mentioned TSM and two kinds of Radio Access Network standards of LCR, for some business, for example circuit-switched speech traffic (CircuitSwitch Speech Service) and IP (Intemet Protocol) speech business, a main difference on physical layer (Physical Layer or Layer 1) transmission technology is: in the TSM standard definition, the time that interweaves can be 20ms or longer 40ms.In the LCR standard, speech frame (Speech Frame) length is 20ms, and the time that interweaves generally is restricted to 20ms.In the time of short like this time, interweave, be not enough to resist the influence of wireless channel burst error sometimes, and then cause the error rate still higher, thereby power system capacity is reduced, influence the performance of TD-SCDMA system.Related definition for physical-layer techniques in the LCR standard can be referring to standard technique document 25.221,25.222,25.223,25.224 and 25.225 (3GPP websites
Www.3gpp.orgIn the download of document is provided).
At in the physical layer data transmission, interweaving the time for business such as circuit switched voice and ip voices in some wireless communication standard than short problem, the performance of opposing wireless channel burst error influence when transmitting in order to improve data wireless, and then the reduction error rate, a direct method is to increase the time that interweaves by increasing the interleave depth of described business datum in physical layer transmission, and the data that are about to more frame add and interweave.According to the supported weave type that defines in the LCR standard, the interweave time of described business datum in physical layer transmission can be increased is 40ms or 80ms.Yet, consider that speech frame is that every 20ms arrives once, increase the time method that interweaves for above-mentioned by increasing interleave depth, at a Transmission Time Interval (Transmission Time Interval) promptly in the length of the time T that interweaves, a plurality of speech frames will be interleaved in together, can produce some following problems thus:
1. when supporting the speech frame transmission of adaptive multi-rate (Adaptive Multi Rate), in the time span that interweaves, the transmission rate of each 20ms speech frame may change, thereby can't represent that the transmission rate of each speech frame in the described time that interweaves changes with a transformat combination indication (Transport FormatCombination Indicator).
2. when being in transfer of data during intermittence, for a plurality of speech frames in the time span that interweaves, be difficult to it is separately carried out discontinuous emission (Discontinuous Transmission), thereby can not effectively utilize discontinuous lift-off technology to reduce interference level in the communication link.
Hence one can see that, increases interleave depth with method of resisting the wireless channel burst error and the speech business that is not suitable for some communication standard, must find another way.
(3) summary of the invention
The object of the present invention is to provide a kind of time method that interweaves that increases in the physical layer data transmission, the performance of opposing wireless channel burst error influence in the time of not only can improving data and in wireless channel, transmit, and avoided above-mentioned and increase the problem that produces in the time method that interweaves by increasing interleave depth, be easy to simultaneously in existing cordless communication network, implement.
Above-mentioned purpose of the present invention realizes by technical scheme once: increase the time method that interweaves in a kind of wireless communication system, wherein, the physical layer data that transmits in wireless channel is interweaved, the former time that interweaves is T, comprise M frame in its time length, above-mentioned frame number M equals the frame length T of former interweave time T and communication system definition
FThe merchant, data allocations to be interweaved is characterized in that in M frame of this group: with a described M frame as first group, wherein the transmission data of each frame on the transmission time, be divided into respectively the individual data sub-block of N (integers of N 〉=2) (11,12 ... 1N; 21,22 ... 2N; 31,32 ... 3N; ...); Then, to the transmission rearrangement of N data sub-block of above-mentioned each frame: the 1st data sub-block in described first group of M frame in each frame (11,21,31 ...) still in first group of M frame, transmit; The 2nd data sub-block in each described first group frame (12,22,32 ...) transmit in second group of M frame behind first group of M frame; The 3rd data sub-block (13 in each described first group frame, 23,33, ...) transmit in the 3rd group of M frame behind above-mentioned second group of M frame, N data sub-block (1N, 2N, 3N in described first group of each frame, ...) end of transmission in M frame of N group, thereby increase the former time that interweaves has been increased N doubly; If comprise transformat combination indication and/or physical layer control character in the described data, transformat combination indication and/or physical layer control character are retained on the original position and transmit.
According to an aspect of the present invention, the transmission data of each frame are divided into N continuous data sub-block respectively in described first group of M frame on the transmission time.
According to a further aspect in the invention, when to the transmission rearrangement of N data sub-block of described each frame, described the 1st data sub-block (11,21,31...) in first group of M frame, transmit on the origin-location of each frame, described the 2nd data sub-block (12,22,32 ...) in second group of M frame, transmit on the correspondence position of each frame, by that analogy, end of transmission on the correspondence position of N data sub-block in described each frame in M frame of N group.
According to another aspect of the invention, the described time T that interweaves is 20ms; The frame length of definition is 5ms, comprises 4 frames in the time span that interweaves, and promptly M equals 4.The transmission data of described each frame are divided into 2 data sub-block (N=2) respectively, to the transmission data in the described time span that interweaves carry out piecemeal and the rearrangement after, the described time span that interweaves is doubled, and is 2T.
For those communication standards that defined subframe structure, method of the present invention can realize the foregoing invention purpose equally, its scheme is as follows: increase the time method that interweaves in a kind of wireless communication system, wherein, the physical layer data that transmits in wireless channel is interweaved, the former time that interweaves is T, comprises M subframe in its time length, and above-mentioned number of sub frames M equals the subframe lengths T of former interweave time T and communication system definition
SFThe merchant, data allocations to be interweaved is characterized in that in M subframe of this group: with a described M subframe as first group, wherein the transmission data of each subframe on the transmission time, be divided into respectively the individual data sub-block of N (integers of N 〉=2) (11,12 ... 1N; 21,22 ... 2N; 31,32 ... 3N; ...); Then, to the transmission rearrangement of N data sub-block of above-mentioned each subframe: the 1st data sub-block of each subframe in described first group of M subframe (11,21,31 ...) still in first group of M subframe, transmit; The 2nd data sub-block in each described first group subframe (12,22,32 ...) transmit in second group of M subframe after first group of M subframe; The 3rd data sub-block (13 in each described first group subframe, 23,33, ...) transmit in the 3rd group of M subframe after above-mentioned second group of M subframe, N data sub-block (1N, 2N, 3N in described first group of each subframe, ...) end of transmission in M subframe of N group, thereby increase the former time that interweaves has been increased N doubly; If comprise transformat combination indication and/or physical layer control character in the described data, transformat combination indication and/or physical layer control character are retained on the original position and transmit.
According to an aspect of the present invention, the transmission data of each subframe are divided into N continuous data sub-block respectively in described first group of M subframe on the transmission time.
According to another aspect of the present invention, when to the transmission rearrangement of N data sub-block of described each subframe, described the 1st data sub-block (11,21,31...) in first group of M subframe, transmit on the origin-location of each subframe, described the 2nd data sub-block (12,22,32 ...) in second group of M subframe, transmit on the correspondence position of each subframe, by that analogy, end of transmission on the correspondence position of N data sub-block in described each subframe in M subframe of N group.
According to a further aspect of the invention, the described time T that interweaves is 20ms; The subframe lengths of definition is 5ms, comprises 4 subframes in the time span that interweaves, and promptly M equals 4.The transmission data of above-mentioned each subframe are divided into 4 data sub-block (N=4) respectively, to the transmission data in the described time span that interweaves carry out piecemeal and the rearrangement after, the described time span that interweaves is increased is 4T.
Method of the present invention is carried out piecemeal and rearrangement to the transmission data in the described time span that interweaves, the data bulk that participation interweaves remains unchanged, under the situation that does not increase interleave depth, time that interweaves can be multiplied, the performance of opposing wireless channel burst error influence in the time of can improving data and in wireless channel, transmit, and avoided above-mentioned and increase the problem that produces in the time method that interweaves by increasing interleave depth.In the present invention, because interleave depth does not change, the original Transmission Time Interval of above-mentioned communication system (TTI) is not changed by method of the present invention, thereby can not produce harmful effect, and can not influence transfer of data is intermittently adopted discontinuous lift-off technology the transmission of the adaptive multi-rate of speech frame.Simultaneously of the present invention transmission is resequenced is easy to implement in existing cordless communication network.
(4) description of drawings
Purpose of the present invention and feature will be elaborated in conjunction with the accompanying drawings by embodiment, and these embodiment are illustrative, not have restricted.
Fig. 1 is illustrated in the existing TD-SCDMATSM system, transmits data conditions in the time T that interweaves;
Fig. 2 represents that method of the present invention is used for an embodiment of the TSM system of Fig. 1, and the data division that transmits in 4 frames in the described time that interweaves is divided into the schematic diagram of 2 data sub-block respectively;
The data sub-block of Fig. 3 presentation graphs 2 was transmitted by rearrangement on 2 times the time that interweaves;
Another embodiment that Fig. 4 represents, method of the present invention is used for TD-SCDMA LCR system, and the transmission data in 4 subframe that interweave in the time are divided into 4 data sub-block respectively;
The transmission rearrangement of those data sub-block in Fig. 5 presentation graphs 4, the time that interweaves rises to 4 times of the former time that interweaves.
(5) embodiment
Fig. 1,2 and 3 expression one embodiment of the present of invention, method of the present invention is used for the TD-SCDMATSM system.According to the TSM standard definition, the data of physical (L1) are distributed in the frame structure to be transmitted, the length T of each frame
FBe 5ms, can be defined as 20ms, this interweave time T and each frame length T for the time T that interweaves of its physical layer data of the circuit voice reciprocal exchange of business
FThe merchant can determine that the frame number M that interweaves that comprises in this time that interweaves is 4.As shown in Figure 1, the data block to be interweaved of physical layer data (data 1, data 2, data 3, data 4) is transmission in 4 above-mentioned interlacing frames (frame i, frame i+1, frame i+2, frame i+3), and interleave depth is data 1 to 4.As shown in Figure 2, the method according to this invention, the data of transmitting in above-mentioned each frame are divided into two data sub-block respectively on the transmission time, and the data 1 among the frame i are divided into two data sub-block 11,12, data 2 are divided into two data sub-block 21,22 among the frame i+1, and are same, data 3 are divided into data sub-block 31,32, data 4 are divided into data sub-block 41,42.Then the transmission sequence of these data sub-block is reset according to principle of the present invention, as shown in Figure 3, with four frame i in the former time that interweaves, i+1, i+2 and i+3 have second group of four frame i+4 as first group of four frame on second time T, i+5, i+6 and i+7.Two data sub-block of each frame are resequenced respectively in first group four frames, and first data sub-block (11,21,31,41) of each frame is still transmitted in its original place frame, for example in situ go up transmission, promptly transmit on each frame start position; Second data sub-block (12 of each frame, 22,32,42) be rearranged in second group of four frame after first group of four frame and transmit, corresponding with its original position in Fig. 2, the sub-piece (12 of these interleaving datas, 22,32,42) be respectively put into second group of each frame (i+4 successively, i+5, i+6 and i+7) in latter half of position on transmit.Like this, though each data block is divided into two, but the data total amount (interleave depth) that participates in interweaving does not have any change, still be data 1 to 4, but when the circuit-switched speech traffic data are transmitted in physical layer in the TSM system interweave the time but by original 1T (=20ms) rise to 2T (=40ms).Original data of transmitting on second group of latter half of position of each frame are put off until successively on the correspondence position in four frames of next group and are transmitted, and adopt in case of necessity accommodation is carried out in data punching or the technology that repeats.In like manner as can be known, if above-mentioned data 1 to 4 are divided into N data sub-block respectively, and with same principle ordering, the time that then interweaves will rise to N T from 1T.From the above embodiments, understand easily, the inventive method advantage technically is, under the situation that interleave depth remains unchanged, time that interweaves can be multiplied, thereby the performance of opposing wireless channel burst error influence can improve data and in wireless channel, transmit the time, data are able to remarkable improvement in the performance of physical layer transmission.Of the present invention transmission rearrangement method is easy to implement in existing cordless communication network, can produce undue influence the other parts of system.The original Transmission Time Interval of system (TTI) is not changed by method of the present invention, thereby discontinuous lift-off technology still can adopt.
Fig. 4 and Fig. 5 represent an alternative embodiment of the invention, and the growth of the present invention time method that interweaves is used for TD-SCDMA LCR.According to the definition of LCR standard, for circuit-switched speech traffic and ip voice business, consider that speech frame 20ms arrives once, the time T that interweaves when its data are transmitted in physical layer is 20ms.Definition has subframe structure, a subframe T in the TD-SCDMA LCR system
SFLength is 5ms, thereby comprises T/T in the time span that interweaves of its physical layer data
SF=4 subframes.Comprise transformat combination indication (TTI) and physical layer control character (Symbol) in the described sub-frame data.
As shown in Figure 4, the growth according to the present invention time method that interweaves, at first with the transmission deblocking of removing in described temporal 4 subframes that interweave outside transformat combination indication and the physical layer control character, the data of transmitting among the subframe i 1 are split into four data sub-block (11,12,13,14), the data among the subframe i+1 2 are divided into four data sub-block (21,22,23,24), the data among the subframe i+2 3 are divided into four data sub-block (31,32,33,34), the data among the subframe i+3 also are divided into four data sub-block (41,42 for 4 times, 43,44).Described transmission data these data sub-block after cutting apart are arranged in order in subframe separately respectively from left to right, transformat combination indication (TTI) and physical layer control character (Symbol) that 4 shadow regions in four subframes among Fig. 4 are represented to comprise in the transmission data of described 4 subframes.
As shown in Figure 5, according to method of the present invention, with described contain treat the sub-piece of interleaving data 4 subframes (subframe i, subframe i+1, subframe i+2, subframe i+3) as first group of subframe.Transmission rearrangement to those data sub-block in four subframes of first group: first data sub-block (11 of first group of each subframe, 21,31,41) still in its original place subframe, transmit, for example in situ go up transmission, promptly on each subframe original position, transmit.Second data sub-block (12,22,32 of first group of each subframe, 42) be rearranged second group four subframes (subframe i+4, subframe i+5, subframe i+6 after first group of subframe, subframe i+7) transmission in, corresponding with its original position first group of subframe, the sub-piece (12,22 of these interleaving datas, 32,42) being respectively put into a left side in second group of each subframe (i+4, i+5, i+6 and i+7) successively rises on second the position and transmits.The 3rd data sub-block (13,23,33 of first group of each subframe, 43) be rearranged the 3rd group four subframes (i+8, i+9, i+10 after first group of subframe, i+11) transmission in, corresponding with its original position in first group of subframe, these the 3rd data sub-block (13,23,33,43) being respectively put into a left side in the 3rd group of each subframe (i+8, i+9, i+10 and i+11) successively rises on the 3rd the position and transmits.The 4th data sub-block (14,24,34 of first group of each subframe, 44) be rearranged the 4th group four subframes (i+12, i+13, i+14 after first group of subframe, i+15) transmission in, corresponding with its original position in first group of subframe, these the 4th data sub-block (13,23,33,43) be respectively put into successively on the least significant in the 4th group of each subframe (i+12, i+13, i+14 and i+15) and transmitted.The second, three, in four groups of subframes, tied up original data on the position by above-mentioned data sub-block, put off until successively on the correspondence position in four subframes of its next group and transmit, adopt in case of necessity accommodation is carried out in data punching or the technology that repeats.The method according to this invention, transformat combination indication and physical layer control character must not be cut apart, and should transmit on the origin-location in first group of each subframe, shown in the first row dash area in the accompanying drawing 5.
Like this, the data total amount (interleave depth) that participates in interweaving does not have any increase, and interleaving data still is a data block (11,12,13,14,21,22,23,24,31,32,33,34,41,42,43,44), but when the circuit-switched speech traffic data are transmitted in physical layer in the LCR system interweave the time but by original 1T (=20ms) rise to 4T (=80ms).Under the situation that interleave depth remains unchanged, the time that interweaves can be multiplied, and data are able to remarkable improvement in the performance of physical layer transmission.Method of the present invention is simple, can not produce undue influence to the other parts of system.Because interleave depth does not change, the original Transmission Time Interval of above-mentioned communication system (TTI) is not changed by method of the present invention, avoided that the transmission rate of each 20ms speech frame may change in the prior art, thereby the problem that can't indicate the transmission rate of representing each speech frame in the described time that interweaves to change with a transformat combination.Discontinuous lift-off technology still can adopt simultaneously.
By two above-mentioned embodiment as can be seen, use method of the present invention, interweaving the time when having increased the professional and ip voice business datum of primary circuit switched voice and in physical layer, transmitting, thereby the performance of opposing wireless channel burst error influence can improve its data and in wireless channel, transmit the time, and can not carry out discontinuous emission during intermittence and exert an influence to the transmission of the adaptive multi-rate of speech frame and when being in transfer of data, avoided above-mentioned and increased the problem that produces in the time method that interweaves, be easy in existing cordless communication network, implement by increasing interleave depth.
Claims (5)
1. increase the time method that interweaves in a wireless communication system, wherein, the physical layer data that transmits in wireless channel is interweaved, the former time that interweaves is T, comprise M frame in its time length, above-mentioned frame number M equals the frame length T of former interweave time T and communication system definition
FThe merchant, data allocations to be interweaved is characterized in that in M frame of this group:
As first group, wherein the transmission data of each frame are divided into N data sub-block 11,12 respectively on the transmission time with a described M frame ... 1N; 21,22 ... 2N; 31,32 ... 3N; ...; M1, M2 ..., MN; Wherein, the first bit representation frame number of each numeral, the second bit representation data block number, and N is the integer more than or equal to 2, then
Transmission rearrangement to N data sub-block of above-mentioned each frame: the 1st data sub-block 11,21,31 in described first group of M frame in each frame ..., M1 still transmits on the original position in first group of M frame; The 2nd data sub-block 12,22,32 in each described first group frame ..., transmit on the correspondence position in M2 second group of M frame behind first group of M frame; The 3rd data sub-block 13 in each described first group frame, 23,33 ..., transmit on the correspondence position of each frame in M3 the 3rd group of M frame behind above-mentioned second group of M frame, N data sub-block 1N in described first group of each frame, 2N, 3N ..., end of transmission on the correspondence position of MN each frame in M frame of N group has increased N doubly thereby increase with the former time that interweaves;
If comprise transformat combination indication and/or physical layer control character in the described data, transformat combination indication and/or physical layer control character are retained on the original position and transmit.
2. increase the time method that interweaves in a kind of wireless communication system as claimed in claim 1, it is characterized in that the transmission data of each frame in described first group of M frame are divided into N continuous data sub-block respectively on the transmission time.
3. increase the time method that interweaves in a kind of wireless communication system as claimed in claim 1, it is characterized in that the described time T that interweaves is 20ms; The frame length of definition is 5ms, comprises 4 frames in the time span that interweaves, and promptly M equals 4.
4. as claim 1, increase the time method that interweaves in 2 or 3 described a kind of wireless communication systems, the transmission data that it is characterized in that described each frame are divided into 2 data sub-block respectively, to the transmission data in the described time span that interweaves carry out piecemeal and the rearrangement after, the described time span that interweaves is doubled, and is 2T.
5. as claim 1, increase the time method that interweaves in 2 or 3 described a kind of wireless communication systems, the transmission data that it is characterized in that described each subframe are divided into 4 data sub-block respectively, to the transmission data in the described time span that interweaves carry out piecemeal and the rearrangement after, the described time span that interweaves is increased is 4T.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1337137A (en) * | 1999-01-13 | 2002-02-20 | 西门子公司 | Method for switching a communications link to another channel (handover) |
| CN1341295A (en) * | 1999-01-11 | 2002-03-20 | 诺泰网络有限公司 | Block interleaving for turbo coding |
| CN1402910A (en) * | 1999-11-30 | 2003-03-12 | 诺基亚有限公司 | Method and arrangement for implementing intra-frame interleaving |
| CN1409905A (en) * | 1999-10-07 | 2003-04-09 | 西门子公司 | Method and device for transmitting data frames and method and device for adapting data rate |
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2004
- 2004-02-11 CN CN2004100392729A patent/CN1655488B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1341295A (en) * | 1999-01-11 | 2002-03-20 | 诺泰网络有限公司 | Block interleaving for turbo coding |
| CN1337137A (en) * | 1999-01-13 | 2002-02-20 | 西门子公司 | Method for switching a communications link to another channel (handover) |
| CN1409905A (en) * | 1999-10-07 | 2003-04-09 | 西门子公司 | Method and device for transmitting data frames and method and device for adapting data rate |
| CN1402910A (en) * | 1999-11-30 | 2003-03-12 | 诺基亚有限公司 | Method and arrangement for implementing intra-frame interleaving |
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