CN100433599C - Transmission format combined indiation decoding method in communication system - Google Patents
Transmission format combined indiation decoding method in communication system Download PDFInfo
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- CN100433599C CN100433599C CNB031308953A CN03130895A CN100433599C CN 100433599 C CN100433599 C CN 100433599C CN B031308953 A CNB031308953 A CN B031308953A CN 03130895 A CN03130895 A CN 03130895A CN 100433599 C CN100433599 C CN 100433599C
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Abstract
The present invention relates to a method for decoding transmission format combination and indication in communication systems. In the method, after transmission format combination and indication (TFCI) in each frame, which are received in the minimal transmission time interval (TTI), are encoded and demodulated with bits, soft information is added; then, the TFCI is decoded to be used as a final TFCI decoding result. The present invention enhances TFCI decoding performance to further obtain reliable transmission channel spread spectrum factors and TFC; consequently, the transmission performance of links is enhanced, and the communication quality of the communication systems is ensured. Simultaneously, the present invention has low realization cost, and only needs to increase a process of adding and merging bit encoding data in the same position. Thus, network operators can use minor investment to obtain the large improvement of the communication quality.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the transformat combination directive decoding method offered in a kind of communication system.
Background technology
Two types DPCH (DPCH) is arranged: Dedicated Physical Data Channel (DPDCH:Dedicated Physical DataChannel) and Dedicated Physical Control Channel (DPCCH:Dedecated Physical ControlChannle) in wideband code division multichannel (WCDMA) communication system.Wherein, Dedicated Physical Control Channel is used to carry the control information that physical layer produces, and control information comprises: support channel estimating that use and pilot tone (Pilot) bit that the sending and receiving end is all known, power control (TPC:Transmit Power Control) bit, feedback indication (FBI:Feedback Indicator) bit and transformat combination indication (TFCI:Transport Format Combination Indicator) bit when being used for coherent demodulation.
In the WCDMA communication system, a plurality of transmission channels can be multiplexed into same physical channel, each transmission channel all has the attribute of oneself, wherein the dynamic attribute of transmission channel is included in the transmission block size and the transmission block piece number of transmission in the Transmission Time Interval (TTI:Transmission Time Interval), and the changed bit rate of transmission channel realizes by change transmission block size and transmission block piece number between every TTI.The TTI information that the physical layer of data receiver is sent according to the upper strata calculates a transformat combination indication (TFCI) that meets transformat combination at present used on the transmission channel, to obtain the transformat combination that present transfer of data is adopted.Receiving terminal just can be known the transformat combination that is multiplexed into the transmission channel on the corresponding 10ms physical frame after detecting TFCI, and size of the transmission block on the transmission channel and transmission block piece number, and then acquisition is mapped to the bit rate and the employed spreading factor of physical channel.
For example, but the TTI value is 1,2,4,8, respectively corresponding 1,2,4,8 physical frames.Data behind each transmission channel coding will send on TTI value corresponding physical frame number.If, TTI=4, then the data of the transmission channel behind the coding will be mapped on 4 physical frames.As shown in Figure 1, represented among the figure that 3 transmission channels are multiplexing and be mapped to process on the physical frame that wherein Zui Da TTI value is 8, minimum TTI value is 2; The TFCI information of each frame in minimum TTI (TTI＞1) is identical.
In order to obtain the dynamic attribute of transformat combination (TFC) and the pairing transformat of each transmission channel, to instruct follow-up deinterleaving, the decoding rate coupling, processes such as channel decoding and Cyclic Redundancy Check error detection need be carried out TFCI decoding to Frame.Currently used TFCI decode procedure is to utilize the last frame TFCI decode results of minimum TTI as final TFCI decode results, concrete TFCI decode procedure is as shown in Figure 2: receive the soft information of DPCCH after every frame demodulation, described soft information is meant the data message of not making 0/1 bit hard decision after the demodulation, earlier through the TFCI abstraction module, the soft information of the TFCI field of each time slot is extracted from the DPCCH frame that receives, and the TFCI that sends next stage to separates mapping block; TFCI separates all TFCI fields among the frame DPCCH that mapping block will receive and reverts to the TFCI decoding module that sends a frame after 32 data to; The TFCI decoding module of one frame uses typical TFCI decoding algorithm to solve the TFCI of every frame, obtains the TFC of corresponding transmission channel and the dynamic attribute of transformat, and further obtains bit rate and the employed spreading factor that be mapped to physical channel this moment.
The characteristics of traditional TFCI decoding are only to utilize the DPCCH demodulating information of present frame to solve TFCI, and do not consider to utilize the identical TFCI information of each the frame repeat its transmission in the minimum TTI to improve the performance of TFCI decoding, and then obtain more reliable spreading factor and TFC.
Summary of the invention
The purpose of this invention is to provide the transformat combination directive decoding method offered in a kind of communication system,, obtain more reliable spreading factor and TFC, effectively improve communication quality to improve the performance of TFCI decoding.
The object of the present invention is achieved like this: the transformat combination directive decoding method offered in the described communication system, for: with the indication of the transformat combination in each frame that receives in the minimum transfer time interval (TTI) (TFCI) bit demodulation, obtain soft information, with the soft information addition on each frame same position, carry out TFCI decoding according to the soft information after the addition again, as the final TFCI decode results in the minimum TTI; Described soft information is meant the data message of not making 0/1 bit hard decision after the demodulation.
Described TFCI bit demodulation in each frame that receives in the minimum TTI is obtained soft information, the method for the soft information addition on each frame same position is further comprised:
A, receive each frame in the minimum TTI of Dedicated Physical Control Channel (DPCCH), and recover the soft information of the TFCI bit in each frame respectively, according to the sequence arrangement behind the coding;
B, the soft information correspondence of the TFCI on each frame same position is carried out the arithmetic addition.
The described TFCI that carries out deciphers, further comprise as the final TFCI decode results in the minimum TTI: the soft information after merging through each frame is carried out TFCI decoding, and determine the spreading factor and the transformat combination (TFC) of this minimum TTI according to this TFCI decode results.
Described transformat combination directive decoding method offered is: be the detection method of a kind of code encoding/decoding mode and transformat.
The value of described minimum TTI is greater than 1 frame.
Described communication system is: be the variable Rate communication system identical with transformat of code encoding/decoding mode in the minimum TTI.
Described communication system is: Wideband Code Division Multiple Access (WCDMA) (WCDMA) communication system.
By technique scheme as can be seen, carry out TFCI decoding after the soft information addition of the present invention after with the demodulation of the identical TFCI coded data of each the frame repeat its transmission in the minimum TTI, to improve the performance of TFCI decoding, and then can obtain more reliable transmission channel spreading factor and TFC, thereby improve the transmission performance of link, guarantee communication quality of communication systems.Simultaneously, realization cost of the present invention is lower, only needs to increase by one and the soft information after the demodulation of same bits coded data is carried out the processing procedure that addition merges gets final product, and makes Virtual network operator can exchange the bigger improvement of communication quality with less input for.
Description of drawings
Fig. 1 is the multiplexing of transmission channel and the schematic diagram that is mapped on the physical frame;
Fig. 2 is existing TFCI decode procedure schematic diagram;
Fig. 3 is a TFCI decode procedure schematic diagram of the present invention.
Embodiment
Core concept of the present invention is the soft information after the demodulation of the identical TFCI coded bit of each frame transmission in the recycling minimum TTI, improve the performance of TFCI decoding, promptly utilize in the minimum TTI TFCI field in each frame carrying identical TFCI this characteristics of encoding, the soft information after the recycling TFCI bit demodulation is carried out TFCI decoding.
The specific embodiment of the present invention as shown in Figure 3, the present invention the value of each the transmission channel minimum TTI that is multiplexed into physical channel greater than 1 situation under, be to adopt following manner to carry out transformat combination indication decoding:
Receive the DPCCH control information after the frame demodulation in the minimum TTI, and the TFCI abstraction module by a frame extracts the TFCI information of each time slot from the DPCCH frame; Separate mapping block through the TFCI of a frame again the TFCI information that extracts is reverted to the soft information of 32 coded datas, and according to the sequence arrangement behind the coding; When the TFCI of the subsequent frame in carrying out minimum TTI deciphers, with the soft information addition of the TFCI coded data on the same position of present frame and previous frame, promptly directly carry out the arithmetic addition, for example the soft information of gained is respectively 1.3 and-0.7, the result who then carries out the arithmetic addition is 0.6, and carry out TFCI according to the soft information result of the coded data after the addition and decipher, to improve the TFCI decode results performance of subsequent frame, thereby obtain the more reliable spreading factor of every frame, spreading factor is normally according to the TFCI acquisition of tabling look-up; Above-mentioned decode procedure continues to carry out, after last frame demodulation in minimum TTI finishes, with the last TFCI decode results in the minimum TTI as the TFCI decode results in this minimum TTI; Then, utilize last the TFCI decode results in the minimum TTI to obtain spreading factor and TFC, wherein TFC is the acquisition of tabling look-up according to the TFCI decode results; Just can utilize TFC to instruct follow-up deinterleaving afterwards, decoding rate coupling, processes such as channel decoding and CRC (cyclic redundancy check (CRC)) error detection.
The present invention is not only applicable to decipher as the TFCI in the wireless communication systems such as WCDMA, also can be applied to simultaneously carry out TFCI decoding in speed remains unchanged in other minimum TTI the variable Rate communication system, to utilize in such communication system the code encoding/decoding mode of each frame characteristics identical in the minimum TTI with transformat, improve the TFCI decoding performance, raising is to the detection probability of code encoding/decoding mode and transformat, thus the receptivity of raising transmission.
Claims (7)
1, the transformat combination directive decoding method offered in a kind of communication system, it is characterized in that: with the indication of the transformat combination in each frame that receives in minimum transfer time interval TTI TFCI bit demodulation, obtain soft information, with the soft information addition on each frame same position, carry out TFCI decoding according to the soft information after the addition again, as the final TFCI decode results in the minimum TTI; Described soft information is meant the data message of not making 0/1 bit hard decision after the demodulation.
2, the transformat combination directive decoding method offered in the communication system according to claim 1, it is characterized in that described with the TFCI bit demodulation in each frame that receives in the minimum TTI, obtain soft information, the method for the soft information addition on each frame same position further comprised:
A, receive each frame in the minimum TTI of special used for physical control channel DPCCH, and recover the soft information of the TFCI bit in each frame respectively, according to the sequence arrangement behind the coding;
B, the soft information correspondence of the TFCI on each frame same position is carried out the arithmetic addition.
3, the transformat combination directive decoding method offered in the communication system according to claim 1 and 2, it is characterized in that the described TFCI of carrying out decoding, further comprise as the final TFCI decode results in the minimum TTI: the soft information after merging through each frame is carried out TFCI decoding, and determine the spreading factor and the transformat combination TFC of this minimum TTI according to this TFCI decode results.
4, the transformat combination directive decoding method offered in the communication system according to claim 1 and 2 is characterized in that described transformat combination directive decoding method offered is: be the detection method of a kind of code encoding/decoding mode and transformat.
5, the transformat combination directive decoding method offered in the communication system according to claim 4, the value that it is characterized in that described minimum TTI is greater than 1 frame.
6, the transformat combination directive decoding method offered in the communication system according to claim 1 and 2 is characterized in that described communication system is: be the variable Rate communication system identical with transformat of code encoding/decoding mode in the minimum TTI.
7, the transformat combination directive decoding method offered in the communication system according to claim 6 is characterized in that described communication system is: Wideband Code Division Multiple Access (WCDMA) WCDMA communication system.
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| CNB031308953A CN100433599C (en) | 2003-01-03 | 2003-05-21 | Transmission format combined indiation decoding method in communication system |
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| CNB031308953A CN100433599C (en) | 2003-01-03 | 2003-05-21 | Transmission format combined indiation decoding method in communication system |
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| CN100433599C true CN100433599C (en) | 2008-11-12 |
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| CN1859059B (en) * | 2005-07-22 | 2010-04-28 | 上海华为技术有限公司 | Method for demodulating transmission format combined indication under uplink compression mode |
| CN103905164B (en) * | 2012-12-27 | 2018-06-19 | 中兴通讯股份有限公司 | A kind of morning stops the feedback method of decoding, apparatus and system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001003366A1 (en) * | 1999-07-06 | 2001-01-11 | Samsung Electronics Co., Ltd. | Apparatus and method for encoding/decoding transport format combination indicator in cdma mobile communication system |
| CN1300474A (en) * | 1999-04-12 | 2001-06-20 | 三星电子株式会社 | Method for controlling gated transmission of dedicated channel in w-cdma communication system |
| WO2002056556A2 (en) * | 2001-01-11 | 2002-07-18 | Sasken Comm Technologies Ltd | Data-rate detection in cdma systems |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1300474A (en) * | 1999-04-12 | 2001-06-20 | 三星电子株式会社 | Method for controlling gated transmission of dedicated channel in w-cdma communication system |
| WO2001003366A1 (en) * | 1999-07-06 | 2001-01-11 | Samsung Electronics Co., Ltd. | Apparatus and method for encoding/decoding transport format combination indicator in cdma mobile communication system |
| WO2002056556A2 (en) * | 2001-01-11 | 2002-07-18 | Sasken Comm Technologies Ltd | Data-rate detection in cdma systems |
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