CN1735004A - The equipment of transmitting redundancy edition signaling and method in the Wideband Code Division Multiple Access (WCDMA) - Google Patents

Abstract

A kind of in Wideband Code Division Multiple Access (WCDMA) the method for transmitting redundancy edition signaling, its step comprises: UE transmits the s parameter in E-DPCCH, UE calculates the r parameter according to the EFN of E-DCH data correspondence.The present invention has only used 1 bit to come transmitting redundancy edition, has saved signaling consumption.Thereby supported the transmission of high data rate by the transmission s parameter that shows.Computing mechanism based on EFN makes the transmission of redundancy versions very reliable.

Description

The equipment of transmitting redundancy edition signaling and method in the Wideband Code Division Multiple Access (WCDMA)

Technical field

The present invention relates to relate to WCDMA, particularly relate to the equipment and the method for a kind of transmitting redundancy edition signaling among the WCDMA.

Background technology

In wireless communication system, chnnel coding provides the noise that runs in a kind of effective opposing signals transmission and the mechanism of interference by adopt inserting redundant mode.Therefore in modern wireless communication systems, channel coding technology is adopted widely to improve power system capacity.Chnnel coding mainly comprises two kinds of functions: a kind of is error detection, checks promptly whether transmission information makes mistakes, and another kind is preceding paragraph error correction (hereinafter to be referred as FEC), the mistake that promptly relies on the redundancy of inserting to come the correction of data transmission to occur.The process of chnnel coding normally is mapped to k information bit on the code word of a n bit.Code rate is defined as k/n.Code rate is more for a short time to mean that the redundant bit of adding is many more.Coding gain is meant the minimizing of the required signal-to-noise ratio that chnnel coding provides.Coding gain is weighed by particular B ER (bit error rate) or the required bit signal to noise ratio (Eb/N0) of FER (frame error rate) usually.Provide certain coding gain just because of chnnel coding, made the needed signal to noise ratio of the same information bit of transmission reduce, thereby effectively raise power system capacity.In Wideband Code Division Multiple Access (WCDMA) (hereinafter to be referred as the WCDMA) system, two kinds of coded systems have mainly been adopted: convolutional encoding and Turbo coding for the chnnel coding of data.

The Turbo coding is a kind of channel coding method of performance brilliance, and the Turbo encoder that WCDMA adopted as shown in Figure 1.The Turbo encoder mainly by constituent encoder 101 and 102 and inner interleaver 103 form.System bits, promptly Shu Ru information flow directly is outputted as 104.Message bit stream passes through constituent encoder 101 through forming verification bit stream 105 after the convolutional encodings.Interleaver 103 is with the order rearrangement of message bit stream, then by forming verification bit stream 106 after the constituent encoder 102 process convolutional encodings.Data flow 104,105 behind three codings and 106 is through forming a data flow, the next processing module that enters reflector then after certain ordering.Obviously, the speed of the Turbo of WCDMA coding is 1/3.As a rule, after channel coding module, have a rate-matched module.This module is carried out certain adjustment according to the capacity of physical channel and the requirement of QoS to the data flow after encoding.When the data flow behind the coding partly or entirely be repeated to transmit the time, actual code rate can be less than 1/3.When the data flow behind the coding is not all transmitted (this situation is called as punching), actual code rate can be greater than 1/3.Big code rate can be transmitted the more information bit under the prerequisite of identical physical channel capacity, but when code rate greater than 1/3 the time, the coding gain of Turbo code can incur loss.When code rate more near 1 the time because code book does not have coding in being similar in fact more, the loss of coding gain is big more.In once transmitting, if all system bits all are transmitted, then this time transmission is called as from decoding transmission or the transmission of priority system position; Otherwise, then be called as non-from decoding transmission or preferential check digit transmission.

HARQ (Hybrid Automatic Repeat Request) is a kind of technology that FEC and ARQ (selecting automatically to retransmit) are combined.ARQ is meant the data of transmission is added the verification protection.When the recipient monitors verification protection mistake, can notify transmit leg that the data of mistake are resend.HARQ is meant that data itself have added verification protection and coding protection simultaneously.The coding gain that coding protection provides has reduced the required signal to noise ratio of transmission data.In case the verification protection finds that mistake has appearred in transfer of data, these data can be resend.Usually, send the first time of data to be called as first and transmit, resending of data is called as re-transmission.Usually, transmission first all is from decoding transmission, and this is because non-decoding performance from the decoding transmission is very poor or can't decipher at all.In the realization of HARQ, receiver need distribute certain buffer storage space.Wrong data appear for transmission first, receiver with the data storing that receives in buffering area.When receiving the data of re-transmission, receiver merges the data in itself and the buffering area.The advantage of HARQ is also can be utilized in the energy decode procedure afterwards of data of erroneous transmissions, and is few when making required gross energy compare no HARQ simultaneously owing to retransmit the time diversity of being introduced, thereby improved link efficiency.When retransmitting, because information bit is identical, the data behind the coding are also identical, but the rate-matched module can select the data behind the different codings to transmit.HARQ mainly contains two types: Chase merges and incremental redundancy (hereinafter to be referred as IR).The data that Chase merges after being meant re-transmission and transmitting selected coding first are identical.The benefit that Chase merges is that implementation is fairly simple, and less to the demand of buffer stores, and shortcoming is that the Chase merging can not change code rate, thereby can not improve coding gain.When the code rate of transmission first when very high since coding gain is less and can not by Chase and and improve, so the performance that Chase merges is relatively poor in this case.IR be meant retransmit and transmit selected coding first after data transformation identical, can hop when promptly retransmitting or all transmission first do not have data behind the coding of transmission.Thereby the benefit of IR is to reduce code rate improves coding gain, and shortcoming is that the realization of IR is comparatively complicated, and bigger to the demand of buffer stores.

In WCDMA, transmission channel is that physical layer offers high-rise service.Dedicated channel (hereinafter to be referred as DCH) is a kind of transmission channel, is characterized in taking special-purpose Radio Resource (as frequency and sign indicating number etc.).Physical channel is by frequency, sign indicating number, and the transmission beginning and ending time, and phase place (I/Q branch road) is determined.The up physical channel of UE comprises Dedicated Physical Data Channel (hereinafter to be referred as DPDCH) and Dedicated Physical Control Channel (hereinafter to be referred as DPCCH) in WCDMA version R99/Re1-4.DPCCH is used for the control information of physical layer for transmission.Transmission channel is mapped on the corresponding physical channel and sends.For example DCH is mapped on the DPDCH.

WCDMA has introduced HSDPA (high-speed down data access) technology in Re1-5.HSDPA is a kind of technology that descending data service is optimized.Adopted the HARQ technology among the HSDPA.Each UE has a plurality of descending processes to transmit data among the HSDPA, and each process all has corresponding signaling indication.When mistake occurring in being transmitted in a process first, data retransmission will be same in-process being transmitted.UE is used for doing soft merging for each process keeps an independent buffering area.Adopting the benefit of multi-process is that a process mistake repeatedly occurs and can not block other process transmission data.In HSDPA, the transmission channel of transmission data is HS-DSCH (high speed descending sharing channels), and the physical channel of corresponding command transmitting is HS-SCCH (shared control channel of HS-DSCH).Indicate redundancy versions (hereinafter to be referred as RV) and constellation version with Xrv among the HS-SCCH.HS-DSCH has two kinds of modulation system: QPSK and 16QAM.The Xrv of two kinds of modulation systems is 3 bits.Constellation version only is used for 16QAM, will not relate in this patent.The pairing Xrv of QPSK only is used to refer to RV.Which part of data that redundancy versions (RV) is used to refer to behind the coding need be transmitted, and itself comprises two parameters: s parameter and r parameter.S parameter (1 bit) is used to refer to prioritised transmission system bits (s=1) or check digit (s=0).The versions of data of r parameter (2 bits) when being used for selecting to transmit, promptly when the s parameter was identical, r parameter selection portion divided the data behind the coding to transmit.In HSDPA, the coded system of the Xrv under the QPSK modulation system as shown in Figure 2.How the r parameter that the figure illustrates the s parameter of 1 bit and 2 bits forms the Xrv of 3 bits by mapping relations.Also transmit other information among the HS-SCCH, comprising new data indication (hereinafter to be referred as NDI) and progress information etc.Progress information is used to refer to the process numbering of the data correspondence of current transmission.NDI is 1 bit, and whether the data that are used to refer to this process are new datas.For re-transmission, NDI remains unchanged; For transmission first, NDI can add 1 (mould 2), promptly becomes 0 (then becoming 1 when being 0) when NDI is 1.

In the WCDMA system, connecting frame number (hereinafter to be referred as CFN) is the frame number that is used for transport channel synchronization between terminal (hereinafter to be referred as UE) and network.For dedicated data channel, the span of CFN is 0 to 255, and network is determined the timing relationship of CFN according to specific algorithm when UE is converted into the CELL_DCH state.CFN adds one (if CFN=256, then CFN is re-set as 0) every a frame (frame of WCDMA is 10 milliseconds).CFN itself does not aloft transmit in the interface, but when Radio Link is set up, be set, that is to say that UE and coupled base station (hereinafter to be referred as Node B) can both the pairing CFN of clear and definite each frame data.

Special uplink channel strengthens (hereinafter to be referred as E-DCH) and is formulating the research project of relevant criterion so that existing special uplink channel is strengthened in the WCDMA system for it.Its research purpose is the up-link performance that strengthens the WCDMA system by the technology such as scheduling of research Adaptive Modulation and Coding, HARQ and Node B control.In E-DCH, corresponding with DPDCH, physical channel E-DPDCH is used to transmit the E-DCH data.Corresponding with DPCCH, physical channel E-DPCCH is the physical channel that is associated with E-DPDCH, is used for the control information of physical layer for transmission.For E-DCH, its Transmission Time Interval (hereinafter to be referred as TTI) is 10 milliseconds or 2 milliseconds.In this patent,, define the relevant connection frame number EFN of an E-DCH for avoiding confusion.EFN is similar with CFN, is the connection frame number that a UE and coupled Node B determine.For the TTI of 10 milliseconds E-DCH, its definition can be identical with CFN.For 2 milliseconds TTI, its definition can be as shown in Equation (1):

The Id of EFN=CFN*5+Id (1) in formula (1) is meant the subscript of TTI in 10 milliseconds of frames of E-DCH, and its span is 0 to 4.For the TTI of 2 milliseconds E-DCH, the span of its EFN is 0 to 1279 like this.Above the definition of the EFN that is given just is used for illustrating the example of EFN, its objective is that explanation EFN is the connection frame number of determining with similar a kind of UE of CFN and coupled Node B.

Similar to HSDPA, E-DCH has introduced the HARQ technology in up link.Redundancy versions among the E-DCH (RV) needs corresponding signaling to transmit.Similar with HSDPA, the RV of E-DCH comprises s parameter and r parameter.In order to save the expense of up link, the RV of E-DCH can come to determine that implicitly promptly RV can draw by certain algorithm computation by EFN by EFN.

Directly calculating RV by EFN exists two more serious defectives.E-DCH need support higher data speed, and the code rate of these higher data rate requirement is higher, for example greater than 0.75.For high code rate, improve coding gain thereby need adopt during re-transmission non-transmission to reduce code rate from decoding.RV must both support the transmission from decoding like this, supports non-transmission from decoding again.But directly calculating by EFN that RV can not guarantee to transmit first must be transmission from decoding.When transmitting right and wrong from the transmission of decoding first, because code rate is higher, transmission first no matter signal to noise ratio has many height also can't correct decoding.Can reduce systematic function like this.

The another one defective is because the value of EFN has certain scope, when the value of EFN is got back to after 0, in some cases (as calculate the algorithm of r parameter at some EFN, the process number of HARQ, under the specific combination of the value number of RV), the value of the RV of some process with get back to 0 in the value of EFN before identical.In this case, coding gain does not improve, and systematic function can decrease to some degree.If getting back to transmission before 0 in the value of EFN is to transmit first and right and wrong during from the transmission of decoding, owing to precedingly transmit that all right and wrong are from the decoding transmission for twice, systematic function can be a greater impact.

Summary of the invention

The equipment and the method that the purpose of this invention is to provide transmitting redundancy edition signaling in a kind of Wideband Code Division Multiple Access (WCDMA).

According to an aspect of of the present present invention, a kind of in Wideband Code Division Multiple Access (WCDMA) the method for transmitting redundancy edition signaling, its step comprises:

UE transmits the s parameter in E-DPCCH,

UE calculates the r parameter according to the EFN of E-DCH data correspondence.

According to another aspect of the present invention, a kind of in Wideband Code Division Multiple Access (WCDMA) the UE equipment of transmitting redundancy edition signaling, comprise

S parameter control module is used to determine each s parameter of transmitting;

The HARQ processing module is calculated the r parameter and is decided the part or all of data behind the coding to be transmitted according to s parameter and r parameter according to EFN.

The present invention has only used 1 bit to come transmitting redundancy edition, has saved signaling consumption.Thereby supported the transmission of high data rate by the transmission s parameter that shows.Computing mechanism based on EFN makes the transmission of redundancy versions very reliable.

Description of drawings

Fig. 1 is the structure of WCDMA Turbo encoder;

Fig. 2 is the coded system of RV among the HSDPA;

Fig. 3 has shown an example of the hardware block diagram of UE transmitter;

Fig. 4 has shown an example of the hardware block diagram of Node B receiver;

Fig. 5 has shown that RNC is with the pattern of s parameter and the process of corresponding r CALCULATION OF PARAMETERS method notice Node B and UE;

Fig. 6 has shown that UE produces the equipment drawing of redundancy edition signaling.

Embodiment

UE sends the s parameter in E-DPCCH.The definition of s parameter can be identical with HSDPA, and promptly s=1 indicates the prioritised transmission system bits and s=0 indication prioritised transmission check digit.Because UE can support higher data speed, thereby non-transmission from decoding can reduce code rate raising coding gain in re-transmission.Transmission first is normally from the transmission of deciphering.For re-transmission, when the code rate of transmission first is higher (for example greater than 0.75), retransmit (i.e. transmission for the second time) for the first time and understand the transmission of right and wrong usually from decoding.

UE calculates the r parameter according to EFN.For 10 milliseconds TTI, EFN can equal CFN.For 2 milliseconds TTI, EFN can calculate according to formula (1).R CALCULATION OF PARAMETERS method can have multiple, concrete example to provide in an embodiment.UE calculates the r parameter according to the EFN of transmission data when sending data.Definition r parameter can have N _rIndividual value.Usually, N _rBe 2 power, then the r parameter has log ₂N _rIndividual bit.The bit number of r parameter can be identical with HSDPA, and promptly the r parameter has 2 bits, N like this _r=4.N _rThe value that other also can be arranged is as 2,8 or the like (corresponding respectively the r parameter of 1 or 3 bit).

Similar with HSDPA, a value that is combined as the RV signaling of definition s parameter and r parameter, working as the r parameter like this has N _rDuring individual value, the value number of RV is 2N _rValue in order to ensure each RV all might be traveled through, and can define UE and send the pattern of s parameter and select corresponding r CALCULATION OF PARAMETERS method.For example, be from decoding with " s " expression transmission, and " n " represent to transmit right and wrong from decoding, can define the pattern of different s parameters, as " snsnsnsn... " or " ssnnssnn... " etc.RNC notifies the pattern and the corresponding r CALCULATION OF PARAMETERS method of UE s parameter by the RRC signaling like this, and notifies the pattern and the corresponding r CALCULATION OF PARAMETERS method of Node B s parameter by the NBAP signaling.

UE produces in the equipment drawing of redundancy edition signaling as shown in Figure 6, and the HARQ processing module 601 of UE and s parameter control module 602 are embodiments of the present invention.The s parameter control module 602 of UE is selected the s parameter according to certain criterion.These criterions can be: transmission first is the transmission or the like from decoding, or according to the s parameter mode of RRC signaling configuration.In addition, when EFN gets back to after 0, if according to r parameter that EFN calculated with get back at EFN before 0 on once the r parameter of transmission is identical, the adjustment s parameter that UE can be suitable so that RV change to some extent.The s parameter is transmitted in E-DPCCH, and the emitter 603 by UE sends at last.In HARQ processing module 601, UE calculates r parameter (concrete computational methods see embodiment) according to the pairing EFN of E-DCH data, and the part or all of data after UE selects to encode according to s parameter and r parameter are then sent by the emitter 603 of UE.Concrete UE emission hardware block diagram provides in an embodiment.

With reference to accompanying drawing, two embodiment of the present invention have been provided below.Too tediously long for fear of the description that makes this patent, in the following description, omitted the detailed description of function that the public is known or device etc.

First embodiment

In the present embodiment, UE selects the s parameter according to the criterion of determining, and comes to produce the r parameter according to ESN according to the algorithm of determining.

S parameter and r parameter the part or all of data select encode after of UE when sending each data send.For example work as s=1, during r=0, UE can send preferential selective system position, and selects corresponding check digit to send according to r=0.

Node B obtains the s parameter from E-DPCCH.Node B calculates the r parameter according to the EFN of sending out data and according to the rule identical with UE.What Node B judged that UE sends according to s parameter and r parameter then is which partial data behind the coding.If transmission first, Node B will decipher data.If retransmit, after merging, data that Node B receives this transmission and the data in the buffering area decipher again.

Below provide three exemplary algorithm calculating the r parameter according to EFN.UE must adopt identical algorithm to come to calculate the r parameter according to EFN with Node B.Use N _ARQIndicate the number of HARQ process, use N _rIndicate the value number of r parameter.

First kind of method of calculating the r parameter be as shown in Equation (2):

This computational methods are fairly simple, and its main feature is with N with EFN _ARQFor the unit is divided into plurality of sections, the value of r is used in these segmentation cocycles.

Second kind of method of calculating the r parameter be as shown in Equation (3):

The characteristics of this computational methods are to work as N _ARQNot N _rIntegral multiple the time, the value of r circulates according to EFN; Work as N _ARQBe N _rIntegral multiple the time, carry out special processing.

The third method of calculating the r parameter is as shown in Equation (4):

This computational methods and first kind of computational methods are similar, and its characteristics are with N _ARQ* N _rFor the unit is divided into plurality of sections, in the even number section, the r parameter draws according to first kind of computational methods, promptly arranges in order; In the odd number section, the r parameter is arranged by backward according to the value that is obtained by first kind of computational methods.In formula,

Expression is not more than the maximum integer of x, and

Expression is not less than the smallest positive integral of x.

Fig. 3 has shown an example of the hardware block diagram of the UE transmitter of using present embodiment.The s parameter control module 602 of UE is selected the s parameter according to certain criterion.The s parameter is E-DPCCH with other information multiplexings in module 303, and these information may comprise NDI etc.The E-DCH data are carried out chnnel coding through Turbo coding module 301.Data behind the coding enter HARQ processing module 601.In HARQ processing module 601, UE calculates the r parameter according to the pairing EFN of E-DCH data, and the part or all of data after UE selects to encode according to s parameter and r parameter then send.Then in interleaver 302, interweaved by the data after 601 processing of HARQ processing module to reduce the performance loss that fading channel is brought.It is multiplexing in module 304 to be interleaved E-DCH data after device 302 is handled and E-DPCCH and other physical channels.Baseband signal scrambling in module 305.The purpose of scrambling is that the signal of UE and the signal of other UE can be distinguished.Signal after the scrambling passes through pulse shaping filter 306 then.The purpose of pulse shaping filter is that signal limitations with UE emission is in specific frequency band.Signal is analog signal through D/A 307 by digital signal transition then.Signal enters radio frequency sending set 308 and carries out the relevant operation of radio frequency afterwards.The signal that comes out from radio frequency sending set is transmitted into the wireless channel by antenna 309.

Fig. 4 has shown an example of the hardware block diagram of the Node B receiver of using present embodiment.The signal of the up emission of UE is received by the antenna 401 of Node B, enters the radio-frequency transmitter 402 of Node B.Received signal is a digital signal from analog signal sampling in A/D converter 403 then.Digital signal is carried out demodulation at last by radio-frequency filter 404 descrambling, despreading and carry out multipath and merge in RAKE receiver 405 then.Data after the demodulation decomposite channels such as E-DCH data and E-DPCCH by demodulation multiplexer 406.E-DPCCH decomposites s parameter 408 and other information through demodulation multiplexer 407, as NDI etc.The E-DCH data are by deinterleaver 409, and HARQ processing module 410 and decoder 411 are resumed and are data 412.In HARQ processing module 410, Node B calculates the r parameter according to the EFN of sending out data and according to the rule identical with UE; What Node B judged that UE sends according to s parameter and r parameter then is which partial data behind the coding.If transmission first, Node B will decipher in decoder 411 data.If retransmit, after merging, data that Node B receives this transmission and the data in the buffering area in decoder 411, decipher again.

Second embodiment

In the present embodiment, network is specified the pattern and the corresponding r CALCULATION OF PARAMETERS method of s parameter.

Fig. 5 has shown that radio network controller (hereinafter to be referred as RNC) is with the pattern of s parameter and the process of corresponding r CALCULATION OF PARAMETERS method notice Node B and UE.The 501st, RNC passes through the process of NBAP signaling with E-DCH CONFIGURATION signaling Node B.The 502nd, RNC passes through the process of RRC signaling with E-DCH CONFIGURATION signaling UE.Consider the signaling that do not draw among Fig. 5 Node B and UE return to RNC for simplifying.The sequential relationship of the signaling among Fig. 5 is unimportant simultaneously: both can send to the RRC signaling of UE earlier, and also can send to the NBAP signaling of Node B earlier.501 signalings both can be new NBAP signalings, and existing NBAP signaling is expanded, and its content comprises the pattern and the corresponding r CALCULATION OF PARAMETERS method of s parameter.Similar, 502 signalings both can be new RRC signalings, and existing RRC signaling is expanded, and its content comprises the pattern and the corresponding r CALCULATION OF PARAMETERS method of s parameter.The pattern of the s parameter in the pattern of the s parameter in 501 signalings and corresponding r CALCULATION OF PARAMETERS method and 502 signalings and accordingly r CALCULATION OF PARAMETERS method be identical.

Below provide the example and the corresponding r CALCULATION OF PARAMETERS method of a s parameter mode.When the s parameter mode is: " snsnsnsn... ", corresponding r CALCULATION OF PARAMETERS method as shown in Equation (4).The value that can guarantee each RV so all might be traveled through.

UE must produce the s parameter according to the pattern of the s parameter of notifying in 502 signalings.For example, when the pattern of s parameter is " snsnsnsn... ", for transmitting, be non-when transmitting for the second time when then transmitting first from the decoding transmission from decoding, when transmitting for the third time be from the decoding transmission ... the rest may be inferred.

UE comes to calculate the r parameter according to EFN according to the r CALCULATION OF PARAMETERS method of notifying in 502 signalings, and is corresponding with it, and Node B comes to calculate the r parameter according to EFN according to the r CALCULATION OF PARAMETERS method of notifying in 501 signalings

UE and Node B in its HARQ module separately to the processing of s parameter and r parameter with first embodiment.

Claims (12)

1. the method for a transmitting redundancy edition signaling in Wideband Code Division Multiple Access (WCDMA), its step comprises:

UE transmits the s parameter in E-DPCCH,

UE calculates the r parameter according to the EFN of E-DCH data correspondence.

2. method according to claim 1 is characterized in that when the TTI of E-DCH is 10 milliseconds EFN=CFN.

3. method according to claim 1 is characterized in that EFN is calculated as follows when the TTI of E-DCH is 2 milliseconds:

EFN＝CFN*5+Id。

4. method according to claim 1 is characterized in that the r parameter is calculated as follows:

5. method according to claim 1 is characterized in that the r parameter is calculated as follows:

6. method according to claim 1 is characterized in that the r parameter is calculated as follows:

7. method according to claim 1 is characterized in that getting back to after 0 as EFN, if according to r parameter that EFN calculated with get back at EFN before 0 on the r parameter once transmitted identical, the adjustment s parameter that UE can be suitable so that RV change to some extent.

8. method according to claim 1.It is characterized in that described UE adopts identical algorithm computation r parameter with Node B.

9. method according to claim 1 is characterized in that also comprising that step: RNC is by pattern and the corresponding r CALCULATION OF PARAMETERS method notice Node B of NBAP signaling with the s parameter.

10. method according to claim 1 is characterized in that also comprising that step: RNC is by pattern and the corresponding r CALCULATION OF PARAMETERS method notice UE of RRC signaling with the s parameter.

11., it is characterized in that when the s parameter mode is " snsnsnsn... " that corresponding r parameter is calculated as follows according to claim 9 or 10 described methods:

12. the UE equipment of a transmitting redundancy edition signaling in Wideband Code Division Multiple Access (WCDMA) comprises

S parameter control module is used to determine each s parameter of transmitting;

The HARQ processing module is calculated the r parameter and is decided the part or all of data behind the coding to be transmitted according to s parameter and r parameter according to EFN.

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