CN102113375B

CN102113375B - Apparatus and method of transmitting and receiving data in soft handoff of wireless communication system

Info

Publication number: CN102113375B
Application number: CN200980130162.4A
Authority: CN
Inventors: 金沂濬; 李炳宽; 金相局; 卢东昱
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2008-09-23
Filing date: 2009-09-09
Publication date: 2014-02-26
Anticipated expiration: 2029-09-09
Also published as: KR100995051B1; JP5039211B2; JP2011518460A; KR20100034691A; CN102113375A

Abstract

The present invention relates to a method of transmitting and receiving data in soft handoff of a wireless communication system. According to one aspect of the present invention, in the method of receiving data in soft handoff of a wireless communication system, a mobile station receives a first sequence being generated by interleaving transmission data using a first interleaver pattern, and also receives a second sequence being generated by interleaving the transmission data using a second interleaver pattern. Then, the mobile station combines and decodes the first sequence and the second sequence before receiving an entire frame having the first sequence allocated thereto.

Description

The apparatus and method that transmit and receive data in the soft switching process of wireless communication system

Technical field

The present invention relates to wireless communication system, more particularly, relate to the apparatus and method that transmit and receive data in the soft switching process of wireless communication system.

Background technology

First, the power control techniques of prior art is described.

Power in mobile communication system is controlled and is referred to the technology that the power grade of the reception signal in receiving terminal is controlled, and system can be worked for the modulation and the needed grade of coding method that adopt according to the transmission rate of transmission data.Specifically, power is controlled to relate to and solve " near-far problem " occurring in reverse link.More particularly, by control travelling carriage transmitting power, make the transmitting power of travelling carriage of more close (or more approaching) base station with the travelling carriage away from differs from one another from base station, the power grade of each travelling carriage that base station can be received is controlled as specific grade.

Travelling carriage comes transmitting power signal and data-signal by reverse link.Here, by the received energy according to making Reverse Pilot Channel (R-PICH), keep constant mode to control the transmitting power of travelling carriage, and carry out reverse power control.The receiving terminal of base station is measured the received energy of Reverse Pilot Channel.Then,, when received energy is during higher than set point as predetermined reference energy grade, the receiving terminal of base station sends " lowering (DOWN) " power control bit (PCB) order that represents to reduce transmitting power to travelling carriage.And when received energy is during lower than this set point, the receiving terminal of base station comes to send to travelling carriage " raising (UP) " power control bit (PCB) order that represents to increase its transmitting power by Forward Power Control Subchannel (F-PCSCH).

Based on this pilot channel power, control, carry out the power of reverse traffic channel (R-TCH) and control, wherein by reverse link, send data.More particularly, by using the ratio (service power is than (TPR:traffic to power ratio)) between the transmitting power of pilot channel and the transmitting power of Traffic Channel, decide the transmitting power of reverse traffic channel.Predetermined the TPR for each data rate of the data that send by Traffic Channel, and the transmitting power of pilot channel is controlled and is changed according to PCBWei unit based on power of reverse link.Thereby the relation between the variable transmit power of pilot channel and predetermined TPR has determined for sending the transmitting power of the Traffic Channel of data.

Below, will describe premature termination (early termination) technology of mixed automatic retransfer request (being called " HARQ " below) method and prior art grouped data in detail.

HARQ method is for improving the efficiency of transmission having the grouped data of the not too responsive characteristic of transmission delay, and HARQ method is comprised of traditional forward error correction (being called " FEC " below) method and HARQ (ARQ) method by error detection.HARQ method is used together with physical layer, and HARQ method combines the data of re-transmission and the data that receive before, guarantees thus the higher power that is decoded into.More particularly, the following this method of HARQ method correspondence, wherein storage sends failed grouping (rather than abandoning the grouping that transmission is failed), then itself and the data that retransmit is combined, and decodes thus.

According to HARQ method, transmitting terminal carries out FEC coding to data grouping information, so that the bit after coding is divided into a plurality of subgroups and sends these subgroups.Can be by by single subgroup, subgroup being decoded, and this subgroup has and represents to send successfully/send failed structure.In addition, receiving terminal combines the subgroup of the same grouping receiving before and the current subgroup receiving, and the grouping after combination is decoded, and to verify to send, is success or failure.After sending the first subgroup, transmitting terminal is from receiving terminal confirmation of receipt (ACK/NACK).Then, if this is confirmed to be, negate to confirm (being called " NACK " below), send in addition another subgroup.In addition, if this is confirmed to be certainly (or determining), confirm (being called " ACK " below), finish the transmission of respective packets.

By generate N subgroup by HARQ method in the situation that, when transmitting terminal sends M subgroup (M < N) and receive ACK feedback, transmitting terminal finishes the transmission of respective packets and does not send all the other subgroups.The method is called " premature termination method ".When using premature termination method, because do not send unnecessary subgroup, so can greatly improve transmitted in packets efficiency.

Below, will describe the premature termination method of prior art circuits channel (circuit channel) in detail.

By circuit channel, send voice (or audio frequency) business (this business is more responsive and generation continuous data for transmission lag).Circuit channel is the form of the channel of performing data transmission interruptedly not.

Fig. 1 is exemplified with the Poewr control method of the reverse link in CDMA 2000 systems.

As shown in Figure 1, in current widely used code division multiple access (CDMA) 2000 systems, the frame with the Traffic Channel of circuit channel architecture is generally equal to 20ms.Each frame comprises 16 time slots, and each time slot is corresponding to 1.25ms.Because receiving terminal sends a PCB for each time slot, so each time slot is called " power control group (PCG) ".

In order to improve the efficiency of transmission of the Traffic Channel with circuit channel architecture, for the standardized of third generation partner program 2 (3GPP2), organize current discussion whether in circuit channel, to apply premature termination method.From to make receiving terminal receive the whole frame of 20ms then different to the conventional method of decoding data, the premature termination method in circuit channel is attempted reception period at frame to decoding data.Therefore,, if successfully complete data receiver, transmitting terminal sends ACK feedback, has interrupted thus the transmission of respective frame.Due to the unnecessary transmission of having interrupted (or stopping) of the method in cdma system, so can reduce the interference with other user.Thereby, can increase whole system capacity (or size).

Fig. 2 is exemplified with the example of applying premature termination method in reverse link traffic channel.With reference to Fig. 2, attempt decoding data at the reception period of frame base station.Then,, when successfully receiving data, base station confirms that by forward direction subchannel (F-ACKSCH) comes to send ACK feedback to travelling carriage.Then,, once receive ACK, travelling carriage stops the transmission of respective frame.

In soft switching process, travelling carriage receives the Traffic Channel of the same information of carrying from two or more base stations.Then, the Traffic Channel that travelling carriage receives each base station from two or more base stations is carried out demodulation, and the Traffic Channel after demodulation is combined, and carries out thus decoding.

In cdma system, Traffic Channel single base station being sent by spreading code is distinguished (or identification).More particularly, each Traffic Channel is given by different walsh-code assignments in base station.Then, base station, by using distributed walsh code to carry out modulation signal, sends the signal after modulation thus.Now, in order to send a plurality of Traffic Channels in single base station, do not produce each other interference, the code rate for FEC chnnel coding in Traffic Channel should be higher.In CDMA2000 system, the in the situation that of radio configuration 4, the code rate for FEC chnnel coding in the Traffic Channel of forward link is 1/2.

When code rate is 1/2, when application premature termination method, only, when receiving 20ms frame at least half or more, the decoding of attempting some place in decoding just may be successful.In other words, when the power that is decoded into only having received less than a half of frame equals 0.

Therefore, the problem of existence is, can not improve the gain of premature termination method.

Summary of the invention

As mentioned above, the shortcoming of art methods is, can not improve premature termination method.

Be designed for the one object of the present invention addressing the above problem and be, proposed a kind of method transmitting and receive data in soft switching process, the method can improve coding gain and premature termination gain.

The technical purpose that is realized and obtained by the present invention is not limited in the technical purpose of pointing out in the description of illustrating here.Below those skilled in the art research explanation or according to printed instructions, claim and accompanying drawing, learn after, other technical purpose of not pointing out is here by apparition.

In order to realize object of the present invention, according to an aspect of the present invention, provide a kind of in wireless communication system the method by the reception data of the travelling carriage in soft switching process, the method comprises the following steps: this travelling carriage receives First ray from the first base station, wherein, this First ray is by being used the first interleaver mode that transmission data are interweaved and generated; This travelling carriage receives the second sequence from the second base station, and wherein, this second sequence is by being used the second interleaver mode that described transmission data are interweaved and generated; And there is the whole frame of distributed First ray in reception before, this travelling carriage by described First ray and described the second sequence combines and to combination after sequence decode.

In order to realize object of the present invention, according to a further aspect in the invention, a kind of travelling carriage that receives data in wireless communication system in soft switching process is provided, this travelling carriage comprises: receiver module, this receiver module receives First ray and receives the second sequence from the second base station from the first base station, this First ray is by being used the first interleaver mode that transmission data are interweaved and generated, and this second sequence is by being used the second interleaver mode that these transmission data are interweaved and generated; And decoder, there is the whole frame of distributed described First ray in reception before, this decoder by described First ray and described the second sequence combines and to combination after sequence decode.

Now, described the second sequence can be corresponding to according to half and described First ray after cyclic shift of the length of described First ray.

In addition, when decoding described in successful execution, described travelling carriage can send ACK to described base station.

And described First ray and described the second sequence can be utilized convolution code and encode.

In addition, described transmission data can be corresponding to speech data.

In order to realize object of the present invention, according to a further aspect in the invention, provide a kind of the first base station communicating from the travelling carriage with in soft switching process in wireless communication system to send the method for data, the method comprises the following steps: this first base station sends First ray to described travelling carriage, wherein, this First ray is by being used the first interleaver mode that transmission data are interweaved and generated; And when receiving positive acknowledgement ACK from described travelling carriage, stop sending the frame with distributed described First ray.Here, described First ray is different from by the second base station by the second sequence of using the second interleaver mode that described transmission data are interweaved and generated, and this second base station is communicating with described travelling carriage.

In order to realize object of the present invention, according to a further aspect in the invention, provide the ，Gai base station, base station that a kind of travelling carriage in wireless communication system and in soft switching process communicates to comprise: encoder, this encoder is to sending data encoding; And interleaver, this interleaver is interweaved and is generated First ray by the data after using the first interleaver mode to coding.Here, when receiving positive acknowledgement ACK from described travelling carriage, described the first base station stops having the transmission of the frame of distributed First ray, and First ray is different from the second sequence by using the second interleaver mode to be generated by the second base station sending data and interweaving, the second base station with mobile communications.

In addition, described transmission data can be corresponding to speech data.

According to each execution mode of the present invention, different patterns or code are used in each base station in a plurality of base stations that communicate from travelling carriage in soft handoff environments, to send data.Thereby, the gain that can improve the premature termination in handoff environment.

Advantage of the present invention is not limited in the advantage of pointing out in the description of illustrating here, by the structure of specifically noting in written description and claim and accompanying drawing, can realize and obtain other advantage.

Accompanying drawing explanation

Fig. 2 is exemplified with the example of applying premature termination method in reverse link traffic channel.

Fig. 3 is exemplified with according to illustrative methods one embodiment of the present invention, send frame when TPR changes.

Fig. 4 is exemplified with reducing TPR method according to 2 of one embodiment of the present invention grades (step).

Fig. 5 is exemplified with according to the exemplary multistage change TPR method of one embodiment of the present invention.

Fig. 6 is exemplified with the method for power ratio control in forward link.

Fig. 7 is exemplified with according to the method for power ratio control in forward link of one embodiment of the present invention.

Fig. 8 is exemplified with according to the method for in reverse link, external circule power control (outer power control loop) being controlled of first embodiment of the invention.

Fig. 9 is exemplified with according to the method for in forward link, external circule power control being controlled of first embodiment of the invention.

Figure 10 is exemplified with according to the method for in reverse link, external circule power control being controlled of second embodiment of the invention.

Figure 11 is exemplified with according to the method for in forward link, external circule power control being controlled of second embodiment of the invention.

Figure 12 is exemplified with according to the method for in reverse link, external circule power control being controlled of third embodiment of the invention.

Figure 13 is exemplified with according to the method for in forward link, external circule power control being controlled of third embodiment of the invention.

Figure 14 is exemplified with according to the example that repeats to send ACK of one embodiment of the present invention.

Figure 15 is exemplified with according to the example that repeats to send NACK of one embodiment of the present invention.

Figure 16 (a) is exemplified with according to the method for specific data speed in forward link of one embodiment of the present invention, and Figure 16 (b) is exemplified with according to the method for specific data speed in reverse link of one embodiment of the present invention.

Figure 17 (a) is exemplified with according to the structure of the first base station of first embodiment of the invention, and Figure 17 (b) is exemplified with according to the structure of the second base station of first embodiment of the invention.

Figure 18 is exemplified with according to the structure of the travelling carriage of first embodiment of the invention.

The method transmitting and receive data in soft switching process of Figure 19 illustration second embodiment of the invention.

Figure 20 (a) is (561 exemplified with generator polynomial, 753) coder structure of convolution code and generator polynomial are (557,751) coder structure of convolution code, and Figure 20 (b) is exemplified with the coder structure with these two convolution codes after combination.

Figure 21 is exemplified with each the upper limit of bit error rate (BER) in 1/4 rate code for 1/2 rate code and combination.

Figure 22 is exemplified with according to the structure of the base station of third embodiment of the invention.

Figure 23 is exemplified with according to an example of the transmission chain of the transmitting terminal of the use wireless topology of one embodiment of the present invention.

Figure 24 is exemplified with according to another example of the transmission chain of the transmitting terminal of the use wireless topology of one embodiment of the present invention.

Figure 25 is exemplified with the communication process between the travelling carriage according to two base stations at use wireless topology of one embodiment of the present invention and in switching.

Figure 26 is exemplified with according to an example handover procedure when using wireless topology of one embodiment of the present invention.

Figure 27 is exemplified with according to another example handover procedure when using wireless topology of one embodiment of the present invention.

Figure 28 is exemplified with according to the F-PCSCH when using wireless topology of one embodiment of the present invention and an example arrangement of F-ACKSCH control channel.

Figure 29 is exemplified with according to the F-PCSCH when using wireless topology of one embodiment of the present invention and another example arrangement of F-ACKSCH control channel.

Figure 30 is exemplified with according to the F-PCSCH when using wireless topology of one embodiment of the present invention and another example arrangement of F-ACKSCH control channel.

Embodiment

Now, will describe the preferred embodiment of the present invention in detail, its example shown in the drawings.Accompanying drawing is included to provide a further understanding of the present invention, and is attached in the application and forms the application's a part, and accompanying drawing shows each execution mode of the present invention, and is used from and explains principle of the present invention with specification one.Possible in the situation that, in whole accompanying drawings, identical Reference numeral represents identical or like.And, omitted with the present invention and described irrelevant parts.

In to explanation of the present invention, when a components list is shown to " a comprising " element (or component part), except as otherwise noted, otherwise this does not represent to have got rid of other element, and means and can comprise other element.In addition, each term that is expressed as "---unit ", " device " (or " machine "), " module " etc. represents to process the unit of at least one function or operation, and can realize according to the form of the combination of hardware, software or hardware and software.

When to circuit channel application premature termination method, each execution mode of the present invention has been described the method that can improve the gain of this premature termination method.

First, describe in detail according to one embodiment of the present invention, changing (or change) service pilot and sending in than (below be called " TPR ") method of frame.

TPR refers to the ratio between the power of distributing to the power of Traffic Channel and distributing to pilot channel.More particularly, the desired performance in order to ensure Traffic Channel, maintains the power of distributing to Traffic Channel with respect to the constant ratio of distributing to the power of pilot channel.Here, TPR represents the value of the power-division ratios between Traffic Channel and pilot channel.

This TPR changes according to the transmission rate of Traffic Channel, coding method and transmission frame period.For example, in CDMA 2000 systems, when sending voice signal (or audio signal) by reverse fundamental channel (R-FCH) with 9600BPS, TPR is 3.75dB.More particularly, compare with the transmitting power of pilot channel, the transmitting power height of Traffic Channel 3.75dB.

In art methods, except the variation due to channel circumstance requires to change the situation of TPR, TPR is maintained to constant grade.In the situation that because the variation of channel circumstance requires to change TPR, base station reselects suitable value, and new TPR value is notified to travelling carriage.In other words, in a frame, use fixing value.

According to each execution mode according to the present invention, send the method for frame, the method according to channel and system mode, the TPR that optimizes for each time slot in frame, sends to each time slot by service signal by application.

Fig. 3 is exemplified with according to illustrative methods one embodiment of the present invention, send frame when changing TPR.

As shown in Figure 3, when the front portion of frame sends Traffic Channel with higher TPR and when the afterbody of frame is during with lower TPR transmission Traffic Channel, the advantage of premature termination method is more effective.In the situation that premature termination method is applied to circuit channel, from receiving terminal, successfully to the moment of decoding data, till transmitting terminal stops sending the moment of the signal of respective frame, can send at least signal of two or more time slots unnecessaryly.Therefore, by the afterbody of frame (wherein the probability of ACK feedback is larger) is set to have lower TPR, can reduce the quantity of power of the signal unnecessarily being sent, reduce thus the grade (or interference volume) of the interference of whole system.

At the change TPR that passes through according to one embodiment of the present invention, send in the method for frame, base station can be by making in all sorts of ways to change TPR.

First, according to classification, reduce TPR method (step reduction TPR method), the TPR in single frame has two different values, wherein, the first time slot to the N time slot is used higher TPR value, and N+1 time slot to last time slot is used lower TPR value.

According to art methods, when transmitted data rates is 9600BPS, whole 16 time slots in general channel circumstance are used the TPR of 3.75dB.Here, according to classification, reduce TPR method, start the TPR that 8 time slots can be used 5.5dB, this TPR of 1.5 times corresponding to traditional TPR (high 1.75dB), and all the other 8 time slots can be used the TPR of 0.75dB, this is corresponding to than the TPR of traditional TPR little 50%.

Next, according to multistage reduction TPR method, TPR in single frame has 3 different values, wherein, the time slot of a frame is divided into a plurality of regions, the time slot that wherein belongs to first area can be used the highest TPR value, and the time slot that belongs to next region is used respectively successively the TPR value lower than a TPR (or the highest TPR).

Fig. 4 is exemplified with reducing TPR method according to 2 of one embodiment of the present invention grades.

With reference to Fig. 4, according to 2 grades of reduction TPR methods, the TPR in single frame has 3 different values, wherein, the time slot of a frame is divided into 3 zoness of different.Here, the time slot that belongs to first area is used the highest TPR value, and the time slot that belongs to second area is used inferior high TPR value, and the time slot that belongs to the 3rd region is used minimum TPR value.

Next, according to multistage change TPR method, the TPR in single frame has a plurality of values, wherein, the time slot of a frame is divided into a plurality of regions, and the time slot that wherein belongs to first area is used a TPR value, and the time slot that belongs to next region is used next TPR value.

With reference to Fig. 5, the time slot in a frame is divided into 8 regions, and regional comprises two PCG.Time slot in regional is used respectively the TPR value that is suitable for each group.In Fig. 5, in the beginning of frame, use higher TPR value, and, along with the increase of PCG index, use lower TPR value.Then, in the end's TPR value that approaches this frame, again uprise.The object arranging is like this, uses the probability that increases premature termination compared with high TPR value by the beginning at frame, is reused compared with high TPR value and is increased frame successful receiving rate in addition by the end at frame.Multistage change TPR method can expand to the method for independent TPR being distributed to whole PCG.

Base station and travelling carriage are known predetermined default TPR value and are used this default value.But in the situation that require TPR value to change according to the channel circumstance of travelling carriage (or state), use upper strata, base station (upper) signaling is to notify this requirement to travelling carriage.But, according to multistage change TPR method, owing to having defined TPR value for regional, so if the TPR value for regional is notified to travelling carriage by top signaling, signaling consumption can will become excessive.Therefore, embodiments of the present invention have proposed following this method, and wherein travelling carriage and base station know that predetermined TPR increases value set (boost value set), and notify the TPR after correction by base station _mODvalue and TPR increase value set index.

Table 1 illustrates the example that increases value set according to the TPR of one embodiment of the present invention.

[table 1]

As shown in table 1, in the situation that determined that the TPR between travelling carriage and base station increases value set, when the TPR after proofreading and correct has been notified in base station _mODwhen value and TPR increase value set index, travelling carriage can be by calculating the TPR (i) of i PCG with following formula 1.

[formula 1]

TPR(i)＝TPR_boost(i)*TPR _MOD

Here, TPR_boost (i) representative is in the TPR_boost value of i PCG shown in table 1.

Next, describe in detail now according to method one embodiment of the present invention, send frame by change ratio between the transmitting power of Forward Power Control Subchannel and the transmitting power of forward traffic channel (or ratio between F-TCH and F-PCSCH, be called " F-TCH/F-PCSCH power ratio " below) in forward link.

Because the pilot channel of forward link is common signal channel, so pilot channel can not be the object that power is controlled.Therefore the power that, should carry out by directly controlling the power of forward traffic channel (being called " F-TCH " below) received power forward link is controlled.Here, when forward traffic channel provides variable-data-rate business (such as voice (or audio frequency) business), due to the uncertainty of transmission rate, so receiving terminal can not directly be measured the received power of Traffic Channel.

Fig. 6 is exemplified with the method for power ratio control in forward link.

As shown in Figure 6, base station sends Traffic Channel and Forward Power Control Subchannel (this Forward Power Control Subchannel as for controlling the PCB feedback channel of reverse transmitting power, hereinafter referred to as " F-PCSCH ") by forward link to travelling carriage.Because F-PCSCH has fixing data rate, so F-FCSCH can be directly used in measurement received power.The transmitting power of F-TCH is recently limited by F-TCH/F-PCSCH power, and according to art methods, maintains F-TCH/F-PCSCH power ratio constant in a frame.When the message transmission rate of F-TCH is 9600BPS, the received power of moving table measuring F-PCSCH, to use the F-TCH/F-PCSCH power ratio of precognition, calculates energy/noise (Eb/No) density of every reception bit thus.After this, travelling carriage compares Eb/No and this set-point, with generating power control bit (hereinafter referred to as " PCB "), by reverse power control subchannel (hereinafter referred to as " R-PCSCH "), to base station, send thus the PCB generating, and control the transmitting power of F-TCH and F-PCSCH.

According to an embodiment of the invention, F-TCH/F-PCSCH power ratio changes in a frame.For example, as shown in Figure 7, when data rate is 9600BPS, and when fiducial value is 0dB, apply 1 grade of reduction method, make to start the F-TCH/F-PCSCH power ratio that 8 time slots can be used 1.75dB, this is corresponding to the F-TCH/F-PCSCH power ratio of 1.5 times of base ratios, and making the F-TCH/F-PCSCH power ratio of all the other 8 can use-3dB of time slot, this carries out and sends thus corresponding to the F-TCH/F-PCSCH power ratio lower than base ratio 50%.

Therefore, the received power of moving table measuring F-PCSCH, and the reception Eb/No of FL-PCB and this set-point are compared, to generate reverse strand PCB (RL-PCB), and generated RL-PCB is sent to base station, carry out thus forward link power and control.

In addition, base station is divided into a plurality of regions by the time slot in a frame, and in advance the F-TCH/F-PCSCH power ratio for regional is notified to travelling carriage.Therefore, when the message transmission rate of F-TCH is 9600BPS, travelling carriage can be measured the received power of F-PCSCH in regional, to use the F-TCH/F-PCSCH power ratio of the precognition of respective regions, calculates thus energy/noise (Eb/No) density of every reception bit.After this, travelling carriage can compare Eb/No and this set-point, to generate PCB.

Next, describe in detail now according to methods an embodiment of the invention, that external circule power control is controlled.

In general, by inner-loop power control and exterior ring power, controlling to carry out power controls.

Inner-loop power control is measured the energy that receives signal at receiving terminal.Then,, when the energy of reception signal is greater than predetermined set-point, will lower power control command transmitting to transmitting terminal.And, when the energy that receives signal is during lower than predetermined set-point, will raise power control command transmitting to transmitting terminal.Thereby, carry out power and control.Exterior ring power is controlled corresponding to the set-point being used in inner-loop power control is controlled, and makes to meet target frame error rate (target FER).

According to the conventional method that external circule power control is controlled, in the situation that target FER is F, when there is frame mistake, receiving terminal increases set-point with x dB.Then,, when successfully having decoded this frame, receiving terminal reduces set-point with x/ (1-1/F) dB.For example, in the situation that target FER is 1%, when there is frame mistake, receiving terminal increases set-point with 1dB.Then,, when successfully having decoded this frame, receiving terminal reduces set-point with 1/ (1-1/0.01) dB=1/99dB.

Now, if be set to have higher value corresponding to the x value of the x dB of the increase of set-point, and when having changed channel circumstance and change desired set-point, its advantage is, the travelling carriage receiving can change set-point at once.But, in experience, change and have in the channel circumstance of stable set-point, the set-point of using may be in desired set-point around unstable (maybe may shake), can cause serious problem thus.In addition, when due to instant burst noise, cause in succession there is frame mistake time the set-point of using be set to be greater than desired set-point.Therefore, for used set-point, need to the longer time period revert to desired set-point.

Therefore,, in order to address this is that, when premature termination method is applied to circuit channel, embodiments of the present invention have proposed a kind of method that external circule power control is controlled.

First, with reference to Fig. 8 and Fig. 9, describe the method that external circule power control is controlled according to first embodiment of the invention in detail.

According to premature termination method, receiving terminal attempts carrying out decoding under the condition of a part that receives frame.In embodiment of the present invention, attempting carrying out in a plurality of points of decoding, at least one that is provided with that target decoding attempts or more point, determine that target decoding attempts the target FER of point thus, and the set-point that target decoding is attempted meets the target FER at the some place that receives whole frame.Subsequently, the set-point of inner-loop power control is controlled for making and can be met the target FER at the commit point place for target decoding.

For example, when the target FER at some place that receives whole frame is corresponding to 1% time, can be set to 20-50% for the target FER at the some place of the trial of target decoding.In addition, the set-point of inner-loop power control can be controlled as making to meet the target FER for the some place of the trial of target decoding.

Fig. 8 is exemplified with according to the method for in reverse link, external circule power control being controlled of first embodiment of the invention, and Fig. 9 is exemplified with according to the method for in forward link, external circule power control being controlled of first embodiment of the invention.

With reference to Fig. 8, base station is controlled the target FER of target decoding trial point, makes to meet final FER (this final FER is corresponding to the target FER that receives the point of whole frame).In addition, this set-point is controlled in base station, makes to meet the target FER that point is attempted in target decoding.In addition, when base station receives signal from travelling carriage, base station compares the energy of the signal receiving and this set-point, with generating power control command, sends the order generating thus to travelling carriage.

With reference to Fig. 9, travelling carriage is controlled the target FER of target decoding trial point, makes to meet final FER (this final FER is corresponding to the target FER that receives the point of whole frame).In addition, travelling carriage is controlled this set-point, makes to meet the target FER that point is attempted in target decoding.In addition, when travelling carriage receives signal from base station, travelling carriage compares the energy of the signal receiving and this set-point, with generating power control command, sends thus the order generating to base station.

Next, with reference to Figure 10 and Figure 11, describe the method that external circule power control is controlled according to second embodiment of the invention in detail.

According to second embodiment of the invention, when receiving terminal sends when receiving the target FER of point of whole frame to transmitting terminal, the target FER of point is attempted in the decoding of transmitting terminal Offered target, makes to meet the target FER of the point that receives whole frame.Then, when transmitting terminal sends to receiving terminal by set target FER, receiving terminal is controlled the set-point of inner-loop power control, makes to meet the target FER receiving.

When data rate variable (such as audio frequency (or voice) data), there is null data rate.More particularly, data are not sent to frame in fact in some cases, when the decoding to frame is failed, it is failure due to channel error that receiving terminal is difficult to identify to the decoding of frame, or is the failure because there are not transmission data to the decoding of frame.Therefore, in second embodiment of the invention, if receiving terminal notifies the quantity of the frame that in the time period arranging, success is decoded to transmitting terminal, transmitting terminal is in the situation that consider Measuring Time length, the quantity of the frame that success is decoded of quantity of the frame of decoding for success and the target FER that point is attempted in the quantity Offered target decoding without the frame of transfer of data, the target FER that makes to meet the point that receives whole frame, notifies set target FER to receiving terminal thus.

Figure 10 is exemplified with according to the method for in reverse link, external circule power control being controlled of second embodiment of the invention, and Figure 11 is exemplified with according to the method for in forward link, external circule power control being controlled of second embodiment of the invention.

With reference to Figure 10, base station sends final FER (this final FER is corresponding to the target FER that receives the point of whole frame), and is sent in the quantity of the interior successful frame of decoding of time period of setting.Correspondingly, travelling carriage is in the situation that consider Measuring Time length, the quantity of the frame that success is decoded of quantity of the frame of decoding for success and the target FER that point is attempted in the quantity Offered target decoding without the frame of transfer of data, make to meet the target FER of the point that receives whole frame, to base station, notify thus set target FER.In addition, base station is controlled the set-point of inner-loop power control, makes to meet the target FER receiving.In addition, when base station receives signal from travelling carriage, base station compares the energy of the signal receiving and this set-point, with generating power control command, sends the order generating thus to travelling carriage.

With reference to Figure 11, travelling carriage sends final FER (this final FER is corresponding to the target FER that receives the point of whole frame), and is sent in the quantity of the interior successful frame of decoding of time period of setting.Correspondingly, base station is in the situation that consider Measuring Time length, the quantity of the frame that success is decoded of quantity of the frame of decoding for success and the target FER that point is attempted in the quantity Offered target decoding without the frame of transfer of data, the target FER that makes to meet the point that receives whole frame, notifies set target FER to travelling carriage thus.In addition, travelling carriage is controlled the set-point of inner-loop power control, makes to meet the target FER receiving.In addition, when travelling carriage receives signal from base station, travelling carriage compares the energy of the signal receiving and this set-point, with generating power control command, sends thus the order generating to base station.

Below, with reference to Figure 12 and Figure 13, describe the method that external circule power control is controlled according to third embodiment of the invention in detail.

According to third embodiment of the invention, when receiving terminal sends when receiving the target FER of point of whole frame to transmitting terminal, transmitting terminal compensates transmitted signal, makes to meet the target FER of the point that receives whole frame.

Figure 12 is exemplified with according to the method for in reverse link, external circule power control being controlled of third embodiment of the invention, and Figure 13 is exemplified with according to the method for in forward link, external circule power control being controlled of third embodiment of the invention.

With reference to Figure 12, base station sends to travelling carriage by the target FER for receiving the point of whole frame.Correspondingly, travelling carriage calculates the target FER that point is attempted in target decoding, makes to meet the target FER of the point that receives whole frame.Then, travelling carriage is by using the ACK/NACK receiving from base station to calculate the FER that point is attempted in target decoding.In addition, FER and target FER that travelling carriage is attempted point by the target decoding of calculating by use ACK/NACK compare, and compensate thus the TPR of transmitted signal.

Now, the predetermined value of the set-point of inner-loop power control is used in base station.

With reference to Figure 13, travelling carriage sends to base station by the target FER that receives the point of whole frame.Correspondingly, the target FER that point is attempted in target decoding is calculated in base station, makes to meet the target FER of the point that receives whole frame.Then, base station is by using the ACK/NACK receiving from travelling carriage to calculate the FER that point is attempted in target decoding.In addition, FER and target FER that travelling carriage is attempted point by the target decoding of calculating by use ACK/NACK compare, and compensate thus the TPR of transmitted signal.Here, TPR represents F-TCH/F-PCSCH power ratio.

Now, travelling carriage is used the predetermined value of the set-point of inner-loop power control.

Next, describe in detail now according to one embodiment of the present invention, for sending the method for positive acknowledgement/Negative Acknowledgement (hereinafter referred to as " ACK/NACK ").

When premature termination method is applied to circuit channel, the performance of acknowledgement channel (hereinafter referred to as " ACKCH ") is quite important.Confirm that mistake comprises: ACK2NACK mistake, is wherein identified as NACK by ACK; And NACK2ACK mistake, wherein NACK is identified as to ACK.When there is ACK2NACK mistake, transmitting terminal can not be carried out premature termination to the transmission of respective frame, therefore can not obtain the gain of premature termination.When there is NACK2ACK mistake, though respective frame successfully do not decode receiving end, but transmitting terminal is still carried out premature termination to the transmission of respective frame, has increased thus FER.

Therefore,, in order to address the above problem, according to one embodiment of the present invention, travelling carriage repeats to send ACK/NACK, until complete respective frame.

Figure 14 is exemplified with according to the example that repeats to send ACK of one embodiment of the present invention.And Figure 15 is exemplified with according to the example that repeats to send NACK of one embodiment of the present invention.

Figure 14 and Figure 15 send exemplified with the ACK/NACK in forward link traffic respectively.But the ACK/NACK that the present invention also can be applied in reverse link traffic sends.

As shown in figure 14, when travelling carriage is when decoding is attempted the execution decoding of some place and successfully carried out decoding processing, travelling carriage sends ack signal continuously to base station, until complete respective frame.Therefore, even if there is ACK2NACK mistake, still, if base station at next ack signal that receives transmission without any wrong in the situation that, the transmission of frame still can premature termination.

As shown in figure 15, when there is NACK2ACK mistake, base station receives ACK and stops sending frame.Then,, when when receiving next NACK signal of transmission without any wrong in the situation that, frame is continued to send in base station.

Below, describe in detail now according to method one embodiment of the present invention, that be used to specify data rate.

When premature termination method is applied to circuit channel, receiving terminal is attempted some place in each decoding and is carried out decoding.Therefore, and only in the end of frame, attempt carrying out decoding and once compare, the complexity of receiver increases.Specifically, in the situation that the data rate of Traffic Channel, corresponding to variable bit rate, should, by adopting the whole speed in the variable bit rate group at trial point place of all decoding, be carried out blind rate decoding.

In order to improve the effect of premature termination method, because should complete decoding and because ACK feedback should be sent to transmitting terminal (thereby stopping or finishing any how unnecessary transmission), so receiver should promptly be carried out decoding within the shorter time period.But, in order to carry out decoding by the whole speed in employing variable bit rate group within the shorter time period, increase the most at last the complexity of receiver.

Therefore, embodiment of the present invention has proposed a kind of method that the data rate of frame or data rate subgroup is assigned to receiving terminal.

ACKSCH is unlikely used in the beginning of frame.Therefore,, as Figure 16 (a) and Figure 16 (b) illustrate, in the beginning of frame, the source of ACKSCH can be used to specify to data rate.More particularly, in the beginning of frame, can be by the source of ACKSCH as speed indication subchannel (hereinafter referred to as " RISCH ").According to embodiment of the present invention, in the beginning of frame, by same radio sources or same CAMD code source as RISCH, and, in the end of frame by same source as ACKSCH.

When for example sending the data of voice (or audio frequency) signal in CDMA 2000 systems, the data rate of Traffic Channel can be comprised of following 5 variable-data-rates: 9600BPS, 4800BPS, 2400BPS, 1200BPS and 0bps.In this case, data rate can be illustrated in table 2.Table 2 shows an example of the modulation symbol sending by RISCH for each data rate.More particularly, transmitting terminal sends to receiving terminal by the symbol corresponding with the data rate shown in table 2, makes the data rate that receiving system can notification frame.

[table 2]

Data rate	Modulation symbol on RISCH
		9600BPS
	1
		4800BPS	-1
2400BPS	J
		1200BPS	-j
0bps
		0

In addition, transmitting terminal can be modulated RISCH according to the mode shown in table 3 or table 4.Table 3 shows another example of the modulation symbol sending by RISCH for each data rate.And table 4 shows another example of the modulation symbol sending by RISCH for each data rate.

[table 3]

[table 4]

As shown in table 3 or table 4, when a plurality of data rates are modulated to prosign, even when there is mistake during process of transmitting in RISCH, still, higher to the probability of the correct modulation of signal in receiving terminal.The peak data rate because receiver can be decoded, so receiver can be carried out blind rate decoding to a plurality of lower data speed simultaneously.

The in the situation that of speech business, table 4 is distributed to 9600BPS and 0BPS (it has the highest frequency level that occurs) by modulation symbol 0, has advantages of thus the expense that reduces RISCH transmitting power.

When transmitting terminal sends modulation symbol when (if table 1 is to as shown in table 3) by RISCH to receiving terminal, receiving terminal adopts the data rate corresponding with this modulation symbol, thus decoding is attempted to point and decodes.In addition, when in decoding, attempt some place unsuccessful while carrying out this decoding, receiving terminal is carried out blind rate for all data rates group and is decoded after receiving whole frame.

In RISCH, occur wrong in the situation that, because send RISCH in the beginning of frame, so the beginning of frame decay.But in the situation that the beginning of frame decay, the probability of the premature termination of this frame reduces.Therefore, in RISCH, there is hardly any deteriorated of the Traffic Channel performance that caused by mistake.

Below, describe in detail now according to urgent Poewr control method one embodiment of the present invention, that use negative NACK (negative NACK).

When premature termination method is applied to circuit channel, ACKSCH sends as the modulation symbol 1 of ACK with as the modulation symbol 0 of NACK, to reduce the expense of transmitting power.More particularly, the in the situation that of NACK, owing to sending to the power of the signal of ACKSCH, be 0, so can reduce the expense of the transmitting power of ACKSCH.

It negates the method for NACK for sending that embodiment of the present invention has proposed a kind of.According to embodiment of the present invention, modulation symbol 1 is sent out as ACK, and modulation symbol 0 is sent out as NACK, and modulation symbol-1 is sent out as negative NACK.

Negative NACK can control for carrying out urgent power.

For example, receiving terminal is measured the received energy of Traffic Channel at decoding trial point place.Then,, when receiving terminal has determined that the received energy of this frame does not meet at the desired energy of the end point place of frame success received frame, it negates NACK that receiving terminal sends to transmitting terminal, makes transmitting terminal can increase the transmitting power of Traffic Channel.

In another example, the energy Ratios power of the signal receiving when receiving terminal control set-point low predetermine level or when low more, it negates NACK that receiving terminal sends to transmitting terminal, and the transmitting terminal that receives this negative NACK increases PC_UP_SIZE+BOOST_UP[dB by transmitting power].

More particularly, received energy (Rx_Pwr) specific power of controlling reference channel when power control set-point low predetermine level (Boost_Th) or when low more (Rx_Pwr < (set-point-Boost_Th)), it negates NACK that receiving terminal sends to transmitting terminal.Now, because received energy during general power control process is lower than set-point (Rx_Pwr < set-point), so will raise power control command transmitting to transmitting terminal.In general, when transmitting terminal receives rise power control command, transmitting power is increased to PC_UP_SIZE.Alternatively, when transmitting terminal receive raise power control command and negative NACK these two time, transmitting power is increased to PC_UP_SIZE+BOOST_UP[dB].

In addition, at ACK/NACK feedback channel, than PCB feedback channel in more reliable situation, when transmitting terminal receives while negating NACK, transmitting terminal is ignored the power control command receiving, and transmitting power can be increased to PC_UP_SIZE+BOOST_UP[dB].

In addition, according to one embodiment of the present invention, at travelling carriage in the situation that in switching state (or situation), from two base stations, receive power control command, the power of carrying out thus reverse chain channel controls, when travelling carriage receives negative NACK in special time window from these two base stations, travelling carriage can increase PC_UP_SIZE+BOOST_UP[dB by transmitting power].

Below, describe in detail now according to method one embodiment of the present invention, that transmit and receive data in soft switching process.

In art methods, in soft switching process, travelling carriage receives same information from a plurality of base stations.Therefore, travelling carriage can not utilize most of advantage of premature termination.Therefore, embodiments of the present invention have proposed a kind of method transmitting and receive data, the method can, by making in a plurality of base stations that communicate from travelling carriage to send data with different patterns or code respectively, improve the gain of the premature termination in soft handoff environments.

For a plurality of base stations by making to communicate at the travelling carriage from soft handoff environments respectively with different patterns or code send data and by make this travelling carriage to different mode or code combine, obtain the process of higher coding gain, this process is called to " code combination (or associating) soft handover ".

First, describe in detail now according to method first embodiment of the invention, that transmit and receive data in soft switching process.

According to the first execution mode, when a plurality of base stations that the travelling carriage with in soft switching process communicates send respectively the Traffic Channel of the same information of carrying, the plurality of base station changes the corresponding order for the coded-bit after transmitting channel coding, the gain that increases thus premature termination method.Below, with reference to Figure 17 and Figure 18, the example that two base stations and the travelling carriage in soft switching process are contacted is described.

As shown in Figure 17 (a) and Figure 17 (b), according to the base station of first embodiment of the invention, comprise: add cyclic redundancy check (CRC) (hereinafter referred to as " CRC ") and tail bit cell 171, encoder 172, rate-matched unit 173, the interleaver 174 that comprises cyclic shifter and frequency multiplier and modulator 175.

When having inputted information bit sequence, add CRC and tail bit cell 171 CRC and tail bit are added in this information bit sequence.172 pairs of these information bit sequence of encoder are carried out FEC coding.

Rate-matched is carried out in rate-matched unit 173, and this matches the information bit sequence after coding the transmission bit of channel.More particularly, rate-matched is by the processing of the flux matched maximum traffic volume to actual channel of the data that will send for each Transmission Time Interval (TTI).

Cyclic shift is carried out in 174 pairs of traditional interweaving of interleaver, and this rearranges the order of information bit sequence according to specific region, and sequence is interweaved.Sequence after 175 pairs of cyclic shifts of frequency multiplier and modulator is carried out spread spectrum and modulation.Sequence after modulation sends by transmitting antenna.

Interleaver 174 is shifted to sequence according to predetermined cyclic shift value.According to first embodiment of the invention, the cyclic shift value of the first base station is different from the cyclic shift value of the second base station.If be b from the sequence of this interleaver output ₀, b ₁..., b _n-1,, when the cyclic shift value of this cyclic shifter equals a, from the bit sequence of this cyclic shifter output, become b _a, b _a+1..., b _n-1, b ₀, b ₁..., b _a-1.Now, N represents from the length of the sequence of interleaver output.

For example, in CDMA 2000 systems, when the travelling carriage in switching and two base stations communicate, and, when these two base stations are carried out FEC chnnel coding according to code rate 1/2 to the information bit that will send in forward link, and, when the cyclic shift value of the cyclic shifter of the first base station equals 0, and, when the cyclic shift value of the cyclic shifter of the second base station equals N/2, from the bit sequence of the cyclic shifter output of the first base station, be b ₀, b ₁..., b _n-1, and the bit sequence of exporting from the cyclic shifter of the second base station is b _n/2, b _n/2+1..., b _n/2-1.Therefore, the first base station is with b ₀, b ₁..., b _n-1order send data, and the second base station is with b _n/2, b _n/2+1..., b _n/2-1order send data.Therefore, the travelling carriage in switching receive 20ms frame 1/2 time, the first base station receives whole sequence (b ₀, b ₁..., b _n-1).Therefore, when only receive 20ms frame 1/2 time, received code speed becomes 1/2, has increased thus the probability that successfully decoding is processed at 1/2 the some place that receives 20ms frame.In addition, can increase when receive 20ms frame more than 1/4 and 1/2 probability of successfully decoding when following and processing of this frame.

In addition, in forward link, when base station is carried out FEC chnnel coding according to code rate 1/2 to the information bit that will send, an information bit is revised as to two Parity Check Bits.Then, send successively the first parity sequences and the second parity sequences after being interweaved by interleaver.When the first execution mode of the present invention is applied to this sending method, the first base station sends to the travelling carriage in switching by the first parity sequences after interweaving, and then sends the second parity sequences after interweaving.The second base station sends the second parity sequences after interweaving, and then sends the first parity sequences after interweaving.

In forward link, in order to send the power control command of controlling for power of reverse link, a part for the coded-bit of Traffic Channel is punched, and insert the F-PCSCH for transmission power control commands here.If not to by with switch in the bit sequence that sends of a plurality of base stations of communicating of travelling carriage carry out cyclic shift, the position (for sending F-PCSCH) of the Traffic Channel after being punched by a plurality of base stations is mutually the same.Therefore,, in each base station of a plurality of base stations, identical coded-bit is punched.But, as shown at the first execution mode of the present invention, if a plurality of base stations are carried out cyclic shift (these values differ from one another) to the bit sequence that will send according to each value in respective cycle shift value, in each base station of a plurality of base stations, differing from one another for sending the punch position of F-PCSCH in Traffic Channel.Therefore, can obtain additional coding gain.

As shown in figure 17, interleaver 174 can comprise cyclic shifter, or, this interleaver and cyclic shifter can be embodied as to other element of base station.If interleaver 174 comprises cyclic shifter, from switch in each base stations of a plurality of base stations of communicating of travelling carriage can use different interleaver modes, to send sequence separately according to different order.

For example, when the travelling carriage when two base stations and in switching communicates, the first interleaver mode can be used in the first base station, and the second interleaver mode can be used in the second base station.Now, by using sequence that the second interleaver mode interweaves corresponding to by using the cyclic shift result of the sequence that the first interleaver mode interweaves.

When the length of the output sequence of this interleaver is N, and, when the sequence interweaving to using the first interleaver mode according to N/2 when the sequence interweaving with the second interleaver mode is carried out cyclic shift, the sequence interweaving if use the first interleaver mode is b ₀, b ₁..., b _n-1, use the second interleaver mode and the sequence that interweaves is b _n/2, b _n/2+1..., b _n/2-1.

More particularly, when the travelling carriage when two base stations and in switching communicates, the cyclic shift value of the first base station can equal 0, and the cyclic shift value of the second base station can equal N/2.

In addition, when the travelling carriage in surpassing two base stations and switching communicates, the cyclic shift value of each base station can equal 0 or N/2.

In addition, can consider various cyclic shift value.For example, not to adopt 1/2 multiple, but can consider that 1/4 multiple is as cyclic shift value.More particularly, while communicating with travelling carriage in switching when two or more base stations, for the cyclic shift value of each base station in 4 base stations, can be { 0, N/4,2*N/4, in 3*N/4} one.

In the situation that the base station communicating with travelling carriage in switching has occurred to change, when base station sends hand off direction message to travelling carriage, new base station of adding can notify cyclic shift value and the newly assigned decoding used to attempt point.

As shown in figure 18, according to the travelling carriage of first embodiment of the invention, comprise: radio frequency and analog-digital converter (RF and AD converter) 181; Despreader and demodulator 182a for the first base station (BS1); Deinterleaver 183a (comprising the cyclic shifter for BS1) for the first base station; Despreader and demodulator 182b for the second base station (BS1); Deinterleaver 183b (comprising the cyclic shifter for BS1) for the second base station; The combiner 184 that information after being deinterleaved by each base station is combined; And decoder buffer 185.

RF and AD converter 181 are converted to digital signal by the analog signal receiving.Despreader and demodulator 182a for BS1 carry out despreading and demodulation to the signal receiving from the first base station.And, for the deinterleaver 183a (comprising the cyclic shifter for BS1) of the first base station in the situation that consider that the cyclic shift value of the first base station carries out cyclic shift to the signal receiving from the first base station.After this, the reception signal of deinterleaver 183a after to cyclic shift deinterleaves.Now, cyclic shifter and deinterleaver 183a can be embodied as respectively to the independent component of travelling carriage.

In addition, despreader and the demodulator 182b for BS2 carries out despreading and demodulation to the signal receiving from the second base station.And, for the deinterleaver 183b (comprising the cyclic shifter for BS2) of the second base station in the situation that consider that the cyclic shift value of the second base station carries out cyclic shift to the signal receiving from the second base station.After this, the reception signal of deinterleaver 183b after to cyclic shift deinterleaves.Now, cyclic shifter and deinterleaver 183b can be embodied as respectively to the independent component of travelling carriage.

In addition, the deinterleaves signal of the deinterleaves signal of the first base station and the second base station is combined as individual signals by combiner 184, is stored in thus in decoder buffer 185.Thereby travelling carriage combines the deinterleaves signal of the deinterleaves signal of the first base station and the second base station, thus the signal after combination is decoded.Before receiving whole frame, when travelling carriage is when frame reception period is attempted data decode, and when data receiver success, travelling carriage carrys out to send to base station ACK by oppositely confirming (ACK) channel.Then the base station that, receives ACK stops (or termination) and sends respective frame.Now, point (or point is attempted in the decoding of the travelling carriage) notice that can travelling carriage be attempted carrying out decoding by base station is to travelling carriage.Shown in first embodiment of the invention, when travelling carriage combines the signal of the signal of the first base station and the second base station and the signal after combination is decoded, can increase the probability of premature termination.

Below, describe in detail now according to method second embodiment of the invention, that transmit and receive data in soft switching process.

According to second embodiment of the invention, two or more base stations that communicate with travelling carriage in soft switching process are by carrying out FEC chnnel coding by convolution code to the data that will send.Here, different convolution code generator polynomials is used in each base station in two or more base stations.And, because travelling carriage combines the signal receiving from two or more base stations and to combination signal decode, so code rate may, lower than the code rate of a base station, improve the gain of premature termination method thus.

With reference to Figure 19, the travelling carriage in soft switching process and two base stations communicate, and the convolution code that code rate is 1/2 is used in these two base stations, so that the data that will send are carried out to FEC chnnel coding.Here, different convolution code generator polynomials is used in each base station in the first base station and the second base station.Therefore, the signal each base station from the first base station and the second base station being received due to travelling carriage combines and the signal after combination is decoded, so code rate is 1/4, and, can increase when receive be less than frame 1/2 time the probability that decoding processes that runs succeeded.

When the code rate of base station is 1/2, and when the length of frame is 20ms, because the probability that decoding processes that runs succeeded of the travelling carriage in soft handoff environments is not zero, so, when only receive be less than frame 1/2 time, just by base station, carry out minute to be coordinated in the decoding trial point that has surpassed 10ms place.But, when the travelling carriage in soft handoff environments not move to soft handover area, when communicating with a plurality of base stations, point is attempted in the decoding that is positioned at 10ms for this mobile assignment in addition.

In addition, in the situation that the base station communicating with travelling carriage in switching has occurred to change, when base station sends hand off direction message to travelling carriage, new base station of adding can notify cyclic shift value and the newly assigned decoding that this base station is used to attempt point.In addition, based on switch in the quantity of the base station that communicates of travelling carriage predetermine decoding and attempt point, and travelling carriage can be attempted some place in predetermined decoding and attempt carrying out decoding.

In this execution mode of the present invention, when communicating, the travelling carriage by description in switching and two base stations specify the method for the convolution code of being used by two base stations.

Figure 20 (a) is that coder structure and the generator polynomial of the convolution code of (561,753) is the coder structure of the convolution code of (557,751) exemplified with generator polynomial.And Figure 20 (b) is exemplified with the coder structure with these two convolution codes after combination.

Even when list entries is identical, still, two convolution codes separately with different generator polynomials still generate respectively different code words.But, as shown in Figure 20 (b), two convolution codes separately with different generator polynomials can be combined with the convolution code with lower code rate.

When the convolution code that code rate is 1/2 is used in each base station in two base stations that the travelling carriage in hypothesis and soft handover communicates, because travelling carriage combines each code the different code receiving respectively from these two base stations, so code rate is 1/4.Therefore, the convolution code of the combination that should be 1/4 according to code rate can show the mode of premium properties, decides by these two generator polynomials that base station is used.

In addition, because travelling carriage communicates with a base station immediately before handoff procedure and afterwards, so two convolution codes that should be 1/2 according to code rate can show respectively the mode of premium properties, decide by these two generator polynomials that base station is used.More particularly, before starting handoff procedure, travelling carriage and serving BS communicate.And after handoff procedure, because travelling carriage and target BS communicate, so, the performance no less important of the performance of the convolution code of 1/2 speed that each base station in these two base stations is used and the convolution code of the combination that code rate is 1/4.

But, when considering the coding gain of code rate 1/4 than much larger true of the coding gain of code rate 1/2, should first consider the performance of 1/2 rate convolutional code that each base station is used.

Therefore,, in the second execution mode of the present invention, for designing, treat that the standard of the convolution code used by these two base stations is comprised of following content: first, can show the premium properties of 1/2 rate convolutional code that each base station in two base stations is used; Secondly, can code displaying speed the superior performance of convolution code of the combination that is 1/4.

Table 5 show when code rate be 1/2, and when the generator polynomial of constraint length during corresponding to K=9.

[table 5]

Title	According to octadic generator polynomial	d _∞(free distance)
			Johannesson	557，751	12
Chambers	515，677	12
			3GPP2	561，753	12

In the generator polynomial shown in table 5, the generator polynomial that can show optimal performance is (561,753).Therefore, selected generator polynomial (561,753).After this, analyze now when the example of selected generator polynomial (561,753) during with generator polynomial (557,751) combination and when selected generator polynomial (561,753) example during with generator polynomial (515,677) combination.

Table 6 illustrates the combination of these generator polynomials.

[table 6]

With reference to Figure 21, when code rate is 1/4, the performance of 3GPP2+Johannesson may be deteriorated a little.But be apparent that, when code rate is 1/2,3GPP2+Johannesson has shown optimal performance.When code rate is 1/4, the performance of the 3GPP2+Johannesson code of 1/4 speed does not demonstrate and the bigger difference that shows the 1/43GPP2 code of optimal performance.Therefore,, according to the standard of second embodiment of the invention, selected 3GPP2+Johannesson code.

Below, describe in detail now according to method third embodiment of the invention, that transmit and receive data in soft switching process.

According to third embodiment of the invention, when the data that will send are carried out to rate-matched, different rate matching pattern is used in each base station in a plurality of base stations that communicate from travelling carriage in soft handover, to improve the gain of additional code rate and premature termination method.

As shown in figure 22, according to the base station of third embodiment of the invention, comprise: add CRC and tail bit cell 221, encoder 222, rate-matched unit 223, interleaver 224 and frequency multiplier and modulator 225.

When having inputted information bit sequence, add CRC and tail bit cell 221 CRC and tail bit are added in this information bit sequence.222 pairs of these information bit sequence of encoder are carried out FEC coding.

Rate-matched is carried out in rate-matched unit 223, and this matches the information bit sequence after coding the transmission bit of channel.More particularly, rate-matched is by the processing of the flux matched maximum traffic volume to actual channel of the data that will send for each Transmission Time Interval (TTI).Now, from switch in a plurality of base stations of communicating of travelling carriage in each base station use different rate matching pattern.Therefore the sequence that, each base station in a plurality of base stations sends differs from one another.

Cyclic shift is carried out in 224 pairs of traditional interweaving of interleaver, and this will rearrange the order of information bit sequence according to specific region, and sequence is interweaved.Sequence after 225 pairs of cyclic shifts of frequency multiplier and modulator is carried out spread spectrum and modulation.By holding through RF, the sequence after modulation sends by transmitting antenna.

Below, describe according to the radio configuration of one embodiment of the present invention now.

When by when improving the said method of voice (or audio frequency) capacity and be applied to wireless communication system, can increase the user's who is held by wireless communication system maximum quantity.But, owing to carrying out identification service channel by walsh code in the forward link of cdma system, so the quantity of the Traffic Channel that can be supported by cdma system is subject to the restricted number of walsh code.In the forward link of CDMA2000 system, the walsh code that is 128 by length due to each voice (or audio frequency) Traffic Channel limits, therefore, unless by expand this walsh code with quasiorthogonal code, otherwise the maximum quantity of supported voice (or audio frequency) Traffic Channel in the forward link of 1.25MHz can not surpass 128.

When travelling carriage is in Zone switched when middle, because Traffic Channel is from a plurality of base station assigns, so, used the walsh code of supporting each base station in a plurality of base stations.More particularly, when travelling carriage Zone switched when middle in thering is the N road of N the sector that is set to active sector, the walsh code that each sector allocated length from N sector is 128.

When whole travelling carriages are in non-Zone switched when middle, in the frequency band of every sector 1.25MHz, can hold maximum quantity and be the user of 128.But Zone switched when middle in 2 tunnels when whole travelling carriages, in the frequency band of every sector 1.25MHz, the actual user's who holds quantity is reduced to 64 users.More particularly, along with being arranged in the quantity of Zone switched travelling carriage, increase, and increase along with being arranged in the quantity of Zone switched active sector, the maximum quantity for the actual user that can hold in each sector reduces.

In this execution mode of the present invention, for the walsh code support that makes during handoff procedure too much to need (or saving) more economically, walsh code is carried out to time division (time-divide), with basis of formation channel, according to corresponding unit, carry out channel allocation thus.Therefore, can by walsh code index, limit traditional circuit channel according to walsh code length.But, according to one embodiment of the present invention, according to walsh code length and time index, by walsh code index, limit basic channel.

For example, when the even-numbered PCG by walsh code index limits a basic channel, and when the PCG by odd-numbered limits another basic channel, can be by only limiting two basic channel with a walsh code.

In another example, when the beginning 10ms of the 20ms frame by single walsh code index limits a basic channel, and when next 10ms by same 20ms frame limits another basic channel, can be by only using a walsh code to limit two basic channel.

In addition, a walsh code can be carried out to time division, to divide three or more basic channel.

When single walsh code being carried out to time division, when limiting a plurality of basic channel, each basic channel can have 1 or higher transmitting coding rate.In this case, in order to make receiving terminal successfully receive data, transmitting terminal sends to a plurality of basic channel by these data, makes the code rate after the combination of receiving terminal be less than 1.

As shown in figure 23, according in the transmission chain of the transmitting terminal of the use wireless topology of one embodiment of the present invention, Traffic Channel is comprised of two basic channel, that is, by forward direction MSC (being called " F-PTCH " below) and the auxiliary Traffic Channel of forward direction (being called " F-STCH " below), formed.

Figure 23 is exemplified with following this example, wherein, a walsh code time is divided into the PCG of even-numbered and the PCG of odd-numbered, to limit two basic channel, and wherein, business information is encoded according to code rate 1/2, and wherein, this business information is sent to this two basic channel.In this case, the code rate of each basic channel is 1.And in order to make receiving terminal successfully receive information, receiving terminal should receive this business information from two or more basic channel.

With reference to Figure 23, each basic channel receives the bit sequence through same interleaver, to carry out independently cyclic shift for each basic channel.Then, by use, distribute to the walsh code of each basic channel and the result after cyclic shift is carried out to spread spectrum modulation, thus from distributing to the PCG transmitted signal of each basic channel.Here, not from the PCG transmitted signal of non-distribution.In Figure 23, can change the order of frequency multiplier and modulator and PCG selector.

At non-mobile assignment in Zone switched, have two basic channel, F-PTCH and F-STCH, successfully to receive business information.When the cyclic shift value of F-PTCH and F-STCH equals 0, and when the walsh code index of each in F-PTCH and F-STCH is mutually the same, and when F-PTCH being distributed to the PCG of odd-numbered of frame, and when F-STCH being distributed to the PCG of even-numbered of frame, identical with the transmitted signal of prior art transmitting terminal according to the transmitted signal of the transmitting terminal of one embodiment of the present invention.

As shown in figure 24, by serial-to-parallel (or unit), the bit sequence after rate-matched is divided into two sequences.Then, each sequence is interweaved and cyclic shift, thus it is carried out to spread spectrum and modulation.In addition, by modulation after signal map to the PCG that distributes to basic channel, to send.

Be described in now in soft handoff environments according to the example of the use wireless topology of one embodiment of the present invention.

With reference to Figure 25, when the cyclic shift value of F-PTCH equals 0, when the length of the output sequence of interleaver is N, and when the cyclic shift value of F-STCH equals N/16, when the walsh code index of each in F-PTCH and F-STCH is mutually the same, and when F-PTCH and F-STCH being distributed to the PCG of the odd-numbered of frame and send thus, according to the transmission of PCG unit signal, there is 50% duty cycle.Thereby, when with premature termination Combination of Methods, the inessential and power of the signal that sends during can being reduced in premature termination and having received the process of ACK feedback.

Figure 26 is exemplified with according to an example handover procedure when using wireless topology of one embodiment of the present invention.And Figure 27 is exemplified with according to another example handover procedure when using wireless topology of one embodiment of the present invention.

With reference to Figure 26, when travelling carriage is connected to the first base station (BS1), travelling carriage receives data by F-PTCH and F-STCH from the first base station.Now, the cyclic shift value of F-PTCH equals 0, and the cyclic shift value of F-STCH equals N/16.

Then, travelling carriage is mobile towards the second base station (BS2), and when carrier wave (or pilot signal) interference ratio (hereinafter referred to as " C/I ") exceeds Traffic Channel interpolation threshold value (T_ADD threshold value), base station controller (BSC) has been distributed to the F-PTCH of the second base station this situation of travelling carriage by switching message to travelling carriage notice.Therefore,, after normally receiving the F-PTCH of the second base station, when travelling carriage sends handoff completion message to base station controller, base station controller can complete this situation to the handoff procedure of travelling carriage and verify.Now, when the cyclic shift value of the F-PTCH of the second base station is (N/2+N/16), can make a gain for code associating soft handover maximize.

In addition, when the pilot tone C/I of the first base station is during lower than predetermined threshold, base station controller notifies by switching message this situation of F-STCH that deallocates (de-allocate) first base station to travelling carriage.Once travelling carriage normally receives this message and sends handoff completion message to the first base station, the first base station stops (or termination) transmission F-STCH, then, regains the walsh code source of distributing to travelling carriage.

When travelling carriage is during further towards the second base station movement, and when the pilot tone C/I receiving from the second base station is during higher than predetermined threshold, base station controller notifies to travelling carriage this situation of travelling carriage of F-STCH of the second base station having been distributed to by switching message.Now, when the cyclic shift value of the F-PTCH of the second base station is N/2, can make the gain of yard joint handoff maximize.

In addition,, when the pilot tone C/I receiving from the first base station abandons threshold value (T_Drop threshold value) lower than Traffic Channel, base station controller deallocates this situation of F-PTCH of (or abandoning) first base station by switching message to travelling carriage notice.Once travelling carriage normally receives this switching message and sends handoff completion message to the first base station, the first base station stops (or termination) transmission F-PTCH, then, regains the walsh code source of distributing to travelling carriage.

In example shown in Figure 26, in the sending point and the 3rd of the second switching message, switch between the sending point of message, the first base station and the second base station only send F-PTCH to travelling carriage.

In Figure 27, deallocating and the distribution of the F-STCH of the second base station carried out simultaneously the F-STCH of the first base station.More particularly, can in N road is Zone switched, be that mobile assignment is from the F-PTCH of N base station.Then, can be the F-STCH of mobile assignment from best single base station.Alternatively, can in N road is Zone switched, be that mobile assignment is from the F-PTCH of N base station.Then, can be also the F-STCH of mobile assignment from some base stations in N base station.

As mentioned above, when use according to one embodiment of the present invention wireless topology time, compare with conventional method, the walsh code source of distributing from each base station in N road is Zone switched has reduced half.Thereby, can solve the phenomenon that walsh code source lacks.

In example shown in Figure 25, by F-PTCH and F-STCH, these two all distributes to the PCG of the odd-numbered of whole frames.Therefore, can increase premature termination gain.But, aspect the utilization rate in the walsh code source corresponding with odd-numbered PCG and even-numbered PCG, may there is imbalance problem.Therefore,, in order to address this problem, a kind of making for each independent and distribute the neatly PCG method in F-PTCH and F-STCH proposed.

In Figure 25, F-PCSCH is perforated and is then sent out in F-PTCH.More particularly, during F-PTCH assigning process, carry out the distribution of F-PCSCH simultaneously.On the contrary, in F-STCH, control channel is perforated, and therefore, does not distribute like this.Therefore, in handoff procedure, from whole base stations of active sector, be mobile assignment F-PTCH, and, be mobile assignment F-STCH when needed.In addition, for the premature termination of reverse chain channel, base station sends F-ACKSCH on forward direction.But, in Figure 25, F-ACKSCH is carried out together with other index signal to time division multiplexing (by adaptive multiplexer (TDM)), and F-ACKSCH is sent to forward direction designator control channel (hereinafter referred to as " F-ICCH ").

In Figure 28, base station is not used F-ICCH in addition, and still, in F-PTCH, punch F-PCSCH and F-ACKSCH, send F-PTCH subsequently.In example shown in Figure 28, need to be for the walsh code source of F-ICCH.But its shortcoming is, F-PTCH is punched too much.

In Figure 29, time division multiplexing is carried out in base station in F-ICCH together with other index signal with F-ACKSCH to F-PCSCH, then send.The advantage of the example shown in Figure 29 is, can freely select the transmission rate of power control command and the transmission rate of ACK.In addition, owing to not having the priority for basic channel when the allocated channel, so can freely determine the allocation and deallocation for F-TCH1 and F-TCH2.

Figure 30 is exemplified with according to the F-PCSCH when using wireless topology of one embodiment of the present invention and another example arrangement of F-ACKSCH control channel.In Figure 30, the base station F-PCSCH that punches in F-TCH1, then sends F-TCH1, and the F-ACKSCH that punches in F-TCH2, then sends F-TCH2.

Each execution mode of the present invention can be realized by the variety of way of the combination such as hardware, firmware, software and hardware firmware and/or software.When realizing each execution mode of the present invention according to the form of hardware, according to operation of sleep mode method in the wireless communication system of one embodiment of the present invention, can realize by a kind of in application-specific integrated circuit (ASIC) (ASIC), digital signal processor (DSP), digital signal processing appts (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microprocessor, microcontroller etc. or their combination.

When realizing each execution mode of the present invention according to the form of firmware or software, can realize the operation of sleep mode method in wireless communication system according to one embodiment of the present invention according to the form of the module of execution above-mentioned functions and/or operation, processing, function etc.Software code can be stored in memory cell and by processor operations.Memory cell can be positioned at inside or the outside of processor, thus by using various known manner to receive data and send data to processor from processor.

In the situation that not departing from technology of the present invention and connotation or scope, can make in the present invention various modifications and distortion, this will be obvious for those skilled in the art.Therefore, detailed description of the present invention should be interpreted as of the present invention whole aspect in limit, but be considered to be exemplary.The scope of claims of the present invention should be determined based on rational explanation, and the whole modifications in appended claim and equivalent thereof will be included in scope of the present invention.Thereby the present invention is intended to contain modification of the present invention and the distortion in the scope that falls into appended claim and equivalent thereof.

Be apparent that in addition, can be by within the scope of the appended claims unreferenced claim being combined preferred implementation is set, or, can be after submitting patent application of the present invention to the claim using preferred implementation as new modification and adding.

Claims

1. in wireless communication system, by the travelling carriage in soft switching process, received a method for data, the method comprises the following steps:

First ray from the first base station received frame, this First ray is by described the first base station by using the first interleaver mode to interweave and generate sending data, and described First ray is to be deinterleaved and obtained by the transmission to from described the first base station;

From the second base station, receive the second sequence described frame, this second sequence is by described the second base station by using the second interleaver mode that described transmission data are interweaved and generated, and described the second sequence is to be deinterleaved and obtained by the transmission to from described the second base station; And

Comprise the whole described frame of described First ray in reception before, by described First ray and described the second sequence combines and to combination after sequence decode,

Wherein, the described First ray of described the second sequence after corresponding to cyclic shift, and

Wherein, in described the first base station and described the second base station attempts described travelling carriage the point of the sequence execution decoding after combination is notified to described travelling carriage.

2. method according to claim 1, the method is further comprising the steps of:

When decoding described in successful execution, to described the first base station, send positive acknowledgement ACK.

3. method according to claim 1, wherein, described the second sequence is corresponding to according to half and described First ray after cyclic shift of the length of described First ray.

4. method according to claim 1, wherein, described First ray and described the second sequence utilize convolution code to encode.

5. method according to claim 1, wherein, described transmission data are corresponding to speech data.

6. in wireless communication system, in soft switching process, receive a travelling carriage for data, this travelling carriage comprises:

Receiver module, the First ray of this receiver module from the first base station received frame also receives the second sequence of described frame from the second base station, this First ray by described the first base station by using the first interleaver mode to interweave and generate sending data, and described First ray is to be deinterleaved and obtained by the transmission to from described the first base station, this second sequence by described the second base station by using the second interleaver mode that these transmission data are interweaved and generated, and described the second sequence is to be deinterleaved and obtained by the transmission to from described the second base station, and

Decoder, before this decoder comprises the whole described frame of described First ray in reception, by described First ray and described the second sequence combines and to combination after sequence decode,

7. travelling carriage according to claim 6, wherein, described the second sequence is corresponding to according to half and described First ray after cyclic shift of the length of described First ray.

8. travelling carriage according to claim 6, wherein, when decoding described in successful execution, described travelling carriage sends positive acknowledgement ACK to described the first base station.

9. travelling carriage according to claim 6, wherein, described First ray and described the second sequence utilize convolution code to encode.

10. travelling carriage according to claim 6, wherein, described transmission data are corresponding to speech data.

11. 1 kinds of first base stations that communicate from the travelling carriage with in soft switching process in wireless communication system send the method for data, and the method comprises the following steps:

To described travelling carriage, send the First ray in frame, this First ray by described the first base station by using the first interleaver mode to interweave and generate sending data; And

When stop sending the described frame with distributed described First ray when described travelling carriage receives positive acknowledgement ACK,

Wherein, by the second base station, by using the second interleaver mode to interweave and generate the second sequence these transmission data, and in described frame, this second sequence is sent to described travelling carriage from this second base station, this second base station is communicating with described travelling carriage,

Wherein, comprise the whole described frame of described First ray in reception before, described mobile radio station by described First ray and described the second sequence combines and to combination after sequence decode,

Wherein, described First ray is to be deinterleaved and obtained by the transmission to from described the first base station by described travelling carriage, and described the second sequence is to be deinterleaved and obtained by the transmission to from described the second base station by described travelling carriage,

12. methods according to claim 11, wherein, described the second sequence is corresponding to according to half and described First ray after cyclic shift of the length of described First ray.

13. methods according to claim 11, wherein, described First ray and described the second sequence utilize convolution code to encode.

14. methods according to claim 11, wherein, described transmission data are corresponding to speech data.

The ，Gai base station, base station that 15. 1 kinds of travelling carriages in wireless communication system and in soft switching process communicate comprises:

Encoder, this encoder is encoded to sending data; And

Interleaver, this interleaver is interweaved and is generated First ray by the transmission data after using the first interleaver mode to coding,

Wherein, the First ray generating is sent to described travelling carriage in frame,

Wherein, when receiving positive acknowledgement ACK from described travelling carriage described in base station stop sending the frame with distributed described First ray,

Wherein, by another base station, by using the second interleaver mode to interweave and generate the second sequence these transmission data, and in described frame, this second sequence is sent to described travelling carriage from this another base station, this another base station is communicating with described travelling carriage,

Wherein, described First ray is to be deinterleaved and obtained by the transmission to from described base station by described travelling carriage, and described the second sequence is to be deinterleaved and obtained by the transmission to from described another base station by described travelling carriage,

Wherein, by described base station, described travelling carriage being attempted to the sequence after combination is carried out to the point of decoding notifies to described travelling carriage.

16. base stations according to claim 15, wherein, described the second sequence is corresponding to according to half and described First ray after cyclic shift of the length of described First ray.

17. base stations according to claim 15, wherein, described encoder utilizes convolution code to encode to described transmission data.

18. base stations according to claim 15, wherein, described transmission data are corresponding to speech data.