CN100394706C - Power control outer loop for communication channels with discontinuous transmission - Google Patents

Abstract

Adjusting a power control setpoint to compensate for imperfect signal detection in a communication channel capable of discontinuous transmission (DTX). The power control setpoint is compensated for false detections by adjusting the power control setpoint by a dynamically determined setpoint back off amount upon detection of a Good Frame. The amount of the setpoint back off is a function of the measured signal quality of the detected Good Frame and the number of Erasure indications received immediately preceding the Good Frame indication. In an alternative embodiment, an expected FER is scaled by one minus the probality of false DTX to compensate for the effects of false DTX. A state machine is implemented to compensate the setpoint for the effects of false erasure. The state machine estimates a number of false erasures by evaluating erasure detections in relation to consecutive DTX detections in the absence of good frame detections.

Description

Power control outer loop with communication channel of discontinuous transmission

Background of invention

Technical field

The present invention relates to the capacity optimization of communication channel.Specifically, the present invention relates to the optimization of outer loop power control when channel can discontinuously send (DTX).

Background technology

Wireless communication system is widely used in providing such as the various types of communications of speech, data or the like.These systems can be based on code division multiple access (CDMA), time division multiple access (TDMA) or some other modulation technique.Cdma system provides some to be better than the advantage of other types system.For example, CDMA can provide the power system capacity of increase.

Cdma system can be designed to support one or more CDMA standards, such as (1) telecommunications industry association (TIA)/Electronic Industries Association (EIA) " the TIA/EIA-95-B travelling carriage-base station compatibility standard that is used for dual mode wideband spread spectrum cellular " (IS-95 standard), (2) association (3GGP) by " third generation cooperative programme " by name proposes, and comprising document Nos.3G TS 25.211,3G TS25.212, the standard (W-CDMA standard) of including in one group of document of 3G TS 25.213 and 3G TS 25.214, (3) association (3GGP2) by " third generation cooperative programme 2 " by name proposes, and comprising " the C.S0002-A physical layer standard that is used for the cdma2000 spread spectrum system ", the standard (cdma2000 standard) that the document of " C.S0005-A upper strata " layer 3 " signaling standard that is used for the cdma2000 spread spectrum system " and " C.S0024cdma2000 High Rate Packet Data air interface specification " is included, and (4) some other standard.

Usually, radio telephone system can be supported many subscriber phones that also can be called mobile phone, subscriber unit or travelling carriage.Travelling carriage is communicated by letter with the base station system (BTS) that is sometimes referred to as the base station based on Radio Link.BTS provides radio frequency (RF) interface between and travelling carriage.In the CDMA telephone system, BTS is called forward link to the link of travelling carriage, is carried by the forward CDMA Channel.Equally, travelling carriage to the link of BTS is called reverse link, is carried by reverse CDMA channel.Base station controller (BSC) receives each frame through acoustic coding from the BTS unit, and is pulse-code modulation (PCM) signal with each frame transform.BSC also will be transformed to each frame through acoustic coding from the above-ground route voice signal of public switched telephone network (PSTN), and they are sent to suitable BTS.

Radio telephone system can be on institute's allocation of communication channels voice-over and data.Carry data on the communication channel that wireless digital telephone system is particluarly suitable for being distributed.Concerning this system,, may come to provide special channels by user's travelling carriage (MS) for the user in order to finish transfer of data.When desired transfer of data when being continuous, it is preferable activating channel continuously.Have continuous activation channel, the user can communication system distribute to activate and effectively send and receive continuous data stream on the channel., employed in communication on the internet such as those, the violent increase of packet data application quantity causes unique user distributed and activates channel continuously and become over-allocation to resource.In addition, because radio telephone speed often is subjected to connecting the constraint of number of times, so if must there be a continuous channel that activates to be exclusively used in this connection, the user may be unwilling to connect telecommunication network with MS.

The designer of radio telephone system has recognized the wish of packet data application on this wireless channel.The designer also recognizes, grouped data and relevant burst transfer can and discontinuous activation, but allow to send on each channel of discontinuous transmission (DTX).

In the cdma communication system, each excited users can be shared identical frequency bandwidth simultaneously in the cellular zone.But because frequency band shares in all users, so from each user with to each user's signal, promptly the signal in forward and the reverse link is all regarded as interference by every other user.

In order to make the channel capacity maximization, cdma communication system is controlled in conjunction with power.All users send in identical bandwidth of identical time in any cellular zone of cdma system, and each user's the transmission interference that brings every other user to experience.The power control and treatment is used to regulate transmitted power so that obtain minimum desired signal quality at receiving terminal.Because be minimized for each user's transmitted power, so the interference component that other users experience is minimized.Because interference level is minimized, so the number of users that can communicate by letter on channel simultaneously has been maximized.

Because transmitted power must be controlled at big dynamic range, so power control is problematic.Travelling carriage (MS) may be in the discrete cell district Anywhere.First MS may be just in time below antenna for base station, and another MS may have big distance from this base station.The variation at distance, landform and multi-path environment that different MS experienced causes the variation of path loss.Path loss between two phones that operate in the same unit district can difference 80dB.

The through-put power that is used for controlling on cdma system forward and the reverse link is handled in closed-loop control.Control transmission in closed loop is carried out the measurement of institute's received power or signal quality at receiving terminal, and provides and feed back to transmitting terminal.

In the reverse link of cdma wireless communication system, use closed power control, guarantee accurately to control reverse link transmit power.In the control of back closed loop power, base station (BS) (or base station controller (BSC)) measured the signal level that receives from each travelling carriage (MS), and provides the instruction that the MS transmitted power is regulated to the feedback of giving each MS.The closed power control loop attempts to regulate each MS transmitted power, and feasible reverse link from all MS in the cellular zone sends signal and reaches the desired minimum level of each MS acquisition required service quality (QoS).

Even all yards channel that sends from the base station is walked same path to travelling carriage, (BS) neither be too overcritical to the power control loop road to the forward link of travelling carriage (MS) from the base station.The operation of forward link power control and treatment and the processing of reverse link are similar.In forward link power control, MS measures the signal level that receives from BS, and provides the instruction that the transmitted power of the sign indicating number channel relevant with that MS is regulated to the feedback of giving BS.Thereby the influence of forward link power control and treatment is with respect to the power of the specific MS sign indicating number channel of other yards channel.

In reverse link was handled, base station or base station controller were measured the signal to noise ratio (E that is received _b/ Io), and measured value and the known adjustable threshold of adjusting point as power control compared.As measured E _b/ Io is on adjusting some the time, and the base station instruct MS reduces predetermined quantity of reverse link transmit power, as 1dB.As measured E _bWhen/Io was lower than threshold value, BS sent an order to MS, made reverse link transmit power increase a fixed qty.

Forward link is handled can the complimentary fashion operation.MS measures the signal to noise ratio (E that is received _b/ N _t), and comparative measurements value and power-adjustable control adjustment point, wherein MS is that forward link signals is used.Forward link uses interference measurement value N _tRather than be used for the Io value of reverse link.As measured E _b/ N _tIn the time of on adjusting point, MS indication BS reduces the predetermined quantity of forward link transmitted power in institute's assigned code channel, is typically the dB mark.As measured E _b/ N _tWhen being lower than threshold value, MS sends an order to BS, increases the fixed qty of forward link transmitted power in institute's assigned code channel.

The numerical value of point is adjusted in the control of forward link and power of reverse link separately, regardless of still being the BS place at MS, mainly is the QoS that determines that receiving terminal is preserved.QoS Chang Zuowei frame deletion rate (FER) is measured, and perhaps is called frame error ratio.As expected, cumulative power control is adjusted point value and is reduced FER, thereby higher QoS is provided.Point is adjusted in power control decrescence increases FER.The threshold value of regulating power control adjustment point occurs in the processing procedure that is called outer loop power control (OLPC).This processing process is called forward outer loop power control (FOLPC) in forward link, and this processing process is called adverse external loop power control (ROLPC) in reverse link.Point is adjusted in forward link power control and power of reverse link control adjustment point all is independently controlled.Because it is different that post a letter standard and the receiving terminal structure used in forward and the reverse link exist, so be used between the adjustment point value of forward and reverse link, having also may be without any correspondence.The similar finger function of term similar, but not value or control is similar.

Manufacturer may implement adverse external loop power control intentionally, thus in cellular zone each MS power control to adjust point be identical, maybe can implement each and independently adjust a little each MS that moves in the cellular zone.The independent use of adjusting point of each MS is all increased the capacity of this channel, obtain the required minimum power of desired QoS because each MS through control, runs on.

Be applicable to that only a realization (for example in running on the IS-2000 cdma system of P1 pattern) that activates the OLPC of channel is simple relatively, because frame is sent on the activation channel continuously by MS, and E _b/ Io or E _b/ N _tMay be updated based on activating channel with FER.Yet, when a plurality of channels are activated, and when one or more channels are allowed discontinuous transmission (DTX), realize considerably complicated.Difficulty is by the frame of DTX with not by DTX, is accurately discriminatively but comprise between the frame of one or more decodings back bit mistakes.The imperfect of DTX and non-DTX frame determined, caused incomplete power control to adjust the some threshold value.Adjust and put the too high channel capacity that causes reducing.Adjust point and channel capacity in order to optimize power control, the outer loop power regulating and controlling that point is adjusted in power control need compensate the DTX and the non-DTX indication of mistake.

When channel can DTX, the integrated DTX detection algorithm of receiving terminal.The imperfect of DTX and non-DTX frame determined, caused the power control of suboptimization to adjust the some threshold value.Adjust and put the too high channel capacity that causes reducing.During OLPC, regulating power control, to adjust that point comes be incorrect DTX and non-DTX indication compensation, and point is adjusted in power control and channel capacity needs thereby optimize.Therefore, providing a power control loop road can accurately compensate the apparatus and method that imperfect DTX detects, will be valuable improvement of industrial quarters.

Summary of the invention

Disclosed a kind of method and apparatus that is applicable to the outer loop power control of on the channel that adopts DTX, communicating by letter.The method and equipment regulate power control adjust point compensate can the communication channel of DTX in imperfect input.Come compensation power control to adjust point by quantity and part that misjudgment detects based on the determined offset of estimation.Raise the integral point compensation rate and regulate power control and adjust point by detecting of dynamically determining, come to adjust point for pseudo-deletion detects compensation power control at good frame.Adjusting the some compensation rate is the measured signal quality of the good frame that detects and the function that receives the deletion amount detection of aforementioned good frame indication immediately.When good frame was detected, the quantity that deletion detects was reset.

In one alternate embodiment, disclosed a kind of method and apparatus that is applicable to the outer loop power control of communicating by letter on the channel of energy DTX.One has the equipment that DTX detects, by determining penalty coefficient and regulating required or desired target FER with penalty coefficient, come the known non-zero ratio P (D|E) that the DTX that gives a delete frame detects is compensated, thus the target FER after obtaining to compensate.P (D|E) may be learnt or be estimated as a constant value, and P (D|E) value also may dynamically be determined based on channel condition.

Can realize that a state machine comes to influence the compensation adjustment point for puppet deletion.Initial state is that each good frame reduces the adjustment point, is that each deletion increases the adjustment point.Along with the detection of any good frame, state machine is got back to initial state.The deletion quantity that the error detection that state machine detects about continuous DTX in detecting by the good frame of assessment shortage is out of one's reckoning.

Among the embodiment, provide the method for outer loop power control to comprise the quantity and the adjusting power control adjustment point related with outer loop power control that the misjudgment frame detects, wherein, this is adjusted to small part and is determined by the estimation quantity that erroneous frame detects.

Among another embodiment, having the Wireless Telecom Equipment that discontinuous transmission (DTX) detects and outer loop power is controlled comprises, the device of putting is adjusted in the related power control of device and the adjusting of frame amount detection and outer loop power control that is out of one's reckoning, wherein, this is adjusted to small part and is determined by the quantity that erroneous frame detects.

Among another embodiment, provide the method for outer loop power control in the communication equipment to comprise, determine penalty coefficient, determine desired target frame error rate based on known non-zero P (D|E) value

(FER) and based on desired target FER and the penalty coefficient determined regulate desired target FER.

Among another embodiment, having the Wireless Telecom Equipment that discontinuous transmission (DTX) detects and outer loop power is controlled comprises, determine the device of penalty coefficient based on known non-zero P (D|E) value, determine the device of desired target frame error rate (FER) and the device of regulating desired target FER based on the desired target FER that determines and penalty coefficient.

In one embodiment, provide the method for outer loop power control to comprise, come to adjust point for the control of non-zero P (D|E) value compensation power by reducing power control adjustment point.

Description of drawings

In conjunction with the accompanying drawings, by detailed description given below, it is more obvious that characteristics of the present invention, essence and advantage will become, and reference number identical among the figure is corresponding consistent in whole explanation:

Fig. 1 is that illustration is carried out the chart that the wireless communication system of some optimization is adjusted in power control.

Fig. 2 is a power control adjustment state diagram of optimizing that is applicable to that imperfect DTX detects.

Fig. 3 A-3D is the flow chart that shows the function of outer loop power control algolithm.

Fig. 4 is the curve chart of FER to number of threshold values N.

Fig. 5 is the curve chart of FER to limiting value D.

Fig. 6 is the functional-block diagram that is applicable to the external loop-around target FER compensation of wrong DTX detection.

Fig. 7 A-7D is the flow chart that illustration is applicable to the power control adjustment point optimization that imperfect DTX detects.

Fig. 8 is the flow chart that detects the subprogram of compensation adjustment point for predetermined number of consecutive DTX.

Fig. 9 is a power control adjustment state diagram of optimizing that is applicable to that imperfect DTX detects.

Embodiment

The CDMA2000 standard provides nine radio configuration for forward traffic channel.Can be defined as comprising forward dedicated control channel (F-DCCH), forward primary channel (F-FCH), forward power control subchannel, the complementary channel (F-SCH) of forward mutual-complementing code channel (F-SCCH) and forward at the signal that forward traffic channel sends.Any one of the radio configuration of nine definition can have the whole or subclass of all defined channels in the forward traffic channel.F-DCCH and F-SCH can discontinuously send.Under the situation of F-DCCH, by the judgement of on the basis of a frame one frame, carrying out still can not send.

The CDMA2000 standard also provides six different radio configuration for reverse traffic channel.Can be defined as comprising Reverse Dedicated Control Channel, Reverse Fundamental Channel, reverse complemental channel and reverse complemental sign indicating number channel at the signal that reverse traffic channel sends.Only some channel exists in any special radio configuration.The CDMA2000 standard allows an operational mode (being called the P2 pattern), and wherein Reverse Dedicated Control Channel (R-DCCH) and reverse complemental channel (R-SCH) use together, and do not have the transmission of Reverse Fundamental Channel (R-FCH).

In addition, the CDMA2000 standard allows R-DCCH and R-SCH all to support DTX.Because frame is not moved platform (MS) and sends, so two channels independently have the possibility that DTX takes place.When MS does not have data to send, or under the situation of R-SCH, when MS did not have enough available power to send R-SCH, this situation took place.Can on R-DCCH and R-SCH, move ground DTX detection algorithm independently and also can be called R-DCCH (or R-SCH) ratio decision algorithm (RDA).

No matter, send the judgement that does not still send a frame and determine at transmitting terminal at forward link that can DTX with still in the reverse link.Receiving terminal is without any in advance knowledge when DTX takes place.Because receiving terminal lacks the knowledge that sends the judgement of DTX about transmitting terminal, the DTX of some type detects the existence of determining DTX at receiving terminal.When DTX occurred on the forward link, DTX detected and can directly carry out in MS.As an alternative, DTX detects and can occur in the signal processing level that is connected with MS output, and can carry out in MS wireless frequency (RF) receiving terminal any signal processing level thereafter usually.On the contrary, DTX detects can be in the base station, base station controller or when the DTX signal when reverse link takes place, in reception any signal processing level thereafter of rl transmission, carry out.

The DTX detection algorithm can provide of following possible outcome for each institute's received frame:

Good frame-algorithm indication frame is sent out, and the frame that success is decoded does not comprise the bit mistake.

Deletion-algorithm indication frame is sent out, but the frame of decoding comprises the bit mistake.

DTX-algorithm indication does not have frame to be sent out.

The performance of DTX detection algorithm can be measured according to the following conditions probability:

P (D|E)=when the result deleted, i.e. frame of the actual transmission of MS, but had a bit decoded in error, like this during the indication DTX of DTX detection algorithm mistake, the probability of declaration DTX.

P (E|D)=when incident is DTX, promptly MS does not have transmit frame, but during the indication of DTX detection algorithm mistake deletion, announces the probability of deletion.

Correct DTX detection algorithm is characterized by P (D|E)=0 and P (E|D)=0.As actual event, P (D|E) and P (E|D) are typically the non-zero rate value.These rate values are big more, and are just big more to the influence of outer loop power control (OLPC).

In typical OLPC algorithm, the upwards step-length of presetting when using the reception of indicating from the deletion of DTX detection algorithm increases power control and adjusts point.Default downward step-length when using the reception from the good frame indication of DTX detection algorithm reduces power control and adjusts point, and during from the reception of DTX detection algorithm, point is adjusted in power control has the left side to change.

Select step-length up and down make focusing on of bring to power control loop required or special-purpose target frame deletion rate (FER).Typical required FER may be in the 1-5% scope.An example of carrying out 1% target mean F ER has the last step-length of 0.3314dB and the following step-length of 0.003348dB.People will recognize that step-length does not need to equate in size up and down, and big more step-length will allow fast more loop to concentrate.Big more step-length can cause loop to concentrate high more potentially mean F ER, yet the ratio of step-length can reduce influence by regulating up and down.

Because the undesirable characteristic of DTX detection algorithm has variety of issue to the channel with DTX and takes place.For example, the DTX of mistake detects, and such as, may causing when signal sends in discontinuous mode when occurring as non-zero P (D|E), external loop-around converges to higher FER.Because not every deletion event is reported by the DTX detection algorithm,, higher FER takes place so concentrating.Because some is used as DTX with deleting timing error and reports, channel acquisition required service quality is necessary for this reason so power control adjustment point is lower than, and the result is negative effect to the data throughput.

Non-zero P (E|D) causes adjusting the normal value that a little is higher than it.Because some DTX incident is categorized as deletion event mistakenly,, power control may be set to the normal value that is higher than it mistakenly so adjusting point.Because than required higher power level is requirement from transmitting terminal, and the signal that is sent on any one yard channel occurs as disturbing every other sign indicating number channel, so the lofty tone integral point of mistake has negative influence to channel capacity.

In order to optimize the characteristic of communication link, the OLPC algorithm that compensates imperfect DTX detection can be carried out at receiving terminal.Fig. 1 has shown that carrying out power control in wireless communication system adjusts the embodiment that point is optimized.Communication system 100 shows as a wireless communication system such as the cdma wireless telephone system.Communication system 100 has one or more base stations, and 110a and 110b are shown as the exemplary antenna system of radio telephone system at this.Although only show two base station 110a at this, 110b can understand that communication system 100 can support any amount of base station.Each base station 110a, 110b are units corresponding district 120a, and 120b provides covering.Two base station 110a, overlay area or cellular zone 120a that 110b supports, 120b is shown as overlapping.Yet, be appreciated that in communication system 100, to surpass the place that a base station is supported, may be overlapping or not overlapping by the cellular zone that each base station is supported.In addition, the cellular zone of any three or more base station may have some shared overlay area or may be unique mutually.

Because the operation of communication system 100 is fully the same in each cellular zone, thus discuss focus on operation in the individual unit district.Base station 110a supports to cover units corresponding district 120a.Have one or more travelling carriages (MS) 130a among the cellular zone 120a, 130b communicates by letter with base station 110a simultaneously.130a, 130b is shown as portable phone, but is appreciated that MS 130a, and 130b may be portable phone, operate in mobile phone, fixed position phone, wireless local loop phone or any other communication equipment in the medium.Base station 110a on forward link channels with each MS130a, 130b communication, each MS 130a, 130b communicate by letter with base station 110a on reverse chain channel.Communication link can maybe can allow DTX on a channel that activates continuously.Base station 110a also with to the public switched telephone network (PSTN) that does not show provides the base station controller (BSC) 150 of communication link to communicate by letter.Power control is used for forward link and reverse link, but the mutual independent operating in power control loop road separately.Closed power control is converged communication link to being the desired minimum transmit power of acquisition required service quality (QoS).

The operation of outer loop power control (OLPC) is similar in the reverse link in the forward link.Ensuing discussion will concentrate on the operation of OLPC in the forward link, but be appreciated that because the operation of OLPC algorithm is similar separately, so this notion also is used for reverse link.In addition, although only described the function of a MS in explanation, the OLPC algorithm function is the same for MS all in the overlay area.

In the forward link, measure as the power control adjustment point of a power control loop road part in the signal dependence that MS 130a receives.The typically expression signal to noise ratio (snr) value that can obtain from the forward link signals that receives of point is adjusted in power control.As an example, the ratio (E that point can be surveyed each bit energy and noise power by likening to is adjusted in power control _b/ N _t).It can use E easily _b/ N _tValue because receiving terminal can be determined this value very soon, thereby is considered power control loop road performance faster.Power control is adjusted point corresponding to the QoS level of measuring as FER.As an alternative, it self special FER value can be power control and adjusts point and use, but because FER is slower than E one _b/ N _tSpeed under determine, so power control loop road performance needn't be correspondingly lower.The adjustment point compares and FER measures and can carry out at MS 130a, or can be in MS 130a signal processing level (not shown) execution thereafter.

By estimating the quantity of the correct frame of determining, and revise and adjust point value and make corrigendum with the frame that mistake is determined, the OLPC algorithm detects imperfect DTX and compensates.The DTX detection algorithm will provide wrong good frame indication, and this is very slippery.Therefore, the wrong deletion of determining or the estimation quantity of DTX frame are directly pointed in the estimation of the frame determined of mistake probably.

Among the embodiment, the be out of one's reckoning quantity of definite delete frame of algorithm reduces power control and adjusts a point with adjusting the some offset.Adjusting the some offset can be constant or dynamically definite.Adjusting the some offset and can be at offset be the function of dynamically determining time institute's measured signal.Institute's measured signal can be the E of good frame _b/ N _tUsing the arrival of good frame is easily as triggering the compensation adjustment point, because the E of the nearest good frame that receives _b/ N _tBe likely the average E of institute's received frame in short time range _b/ N _tA good estimation.In addition, E _b/ N _tMay measure as the part process of power control and treatment.Therefore, E _b/ N _tUse can not produce bigger processing burden at receiving terminal.

The upper limit that pseudo-deletion detects is the sum that deletion detects.When a good frame detects when triggering compensation power control and adjust point and use, the upper limit that pseudo-deletion detects is the quantity that the deletion that takes place between continuous good frame detects detects.Certainly, the deletion of not every detection all is that wrong deletion detects.Therefore, adjust the function that the some compensation rate can be the quantity that the deletion of generation detected between continuous good frame detected.

Shown detailed status figure among Fig. 2 to the adjustment point backoff algorithm 200 of OLPC.State machine is reset, and enters 202 on initialization event.Initialization event can be when MS opens first, in the overlay area in the registration of MS, in the initialization of Traffic Channel, in the initialization of communicating by letter on can the channel of DTX, in the initialization of DTX communication or any other initialization event.

Reset and initialization 202 after, the state machine O 210 that gets the hang of, the detection of the frame that the right here waiting next one receives.Update mode machine 200 is easily behind each frame, can carry out on the basis of a frame one frame because DTX detects.If the DTX algorithm judges that the next frame that is received is a DTX frame 214, state machine is retained in state O 210, and waits the detection of next institute received frame.If the DTX algorithm detects a good frame 212, state machine advances to state G 220, and reduces the adjustment point with default downward quantity.Default downward quantity can be default as discussed above downward step-length.

When state G 220, state machine 200 is waited for next frame.If next frame is as DTX224 when detected, state machine 200 is retained in state G 220.Similarly, if next frame is as a good frame 222 when detected, state machine 200 is retained in state G 220.When state G 220, the default downward step-length when also being used in the detection of good frame 222 reduces the adjustment point.Yet if next frame is detected as deletion 226, state machine 200 advances to state E 230.Deletion detects 226 and causes the current adjustment point value of state machine 200 reservations to adjust point value as history, is named as Old_Setpoint at this.The deletion counting also is initialized as 1, and adjusting point value increases by default upwards quantity.The default upwards quantity that adjusting point increases can be default as previously discussed upwards step-length.

Get back to state O 210, deletion detects 216 same advanced state machines 200 to state E 230.When at state O 210, to delete detection 216 and cause the current adjustment point value of state machine 200 reservations to adjust point value too as history, initialization deletion counting is 1, and presses predetermined number increase adjustment point.

When at state E 230, therefrom can derive the error detection quantity of adjusting the some offset in order to estimate, state machine is counted the deletion amount detection.Detect 234 if DTX takes place when at this state, then state machine 200 is retained in state E 230.If deletion detection 236 takes place when state E 230, then state machine 200 increases progressively the deletion counting and adjusts point by the increase of default upwards quantity.Detect 232 if good frame takes place when state E 230, then state machine is got back to state G 220.Good frame detects 232 trigger events that also are used for as the compensation power control adjustment point that the latent fault frame is detected.State machine reduces with default downward quantity adjusts point value, and the deletion counting to be reset be zero.Why to be reset be zero to the deletion counting, be because adjust the compensation of point consider detect from last good frame since (or since state machine 200 initialization, get in the middle of the two on time back takes place) whole deletions of being taken place detect.If have, state machine 200 is just adjusted the definite of a compensation, adjusts the amount that point should further reduce with assessment, so that the mistake deletion detection of being estimated is compensated.Adjusting the some compensation can be a constant value or dynamically definite.Shown the definite algorithm flow chart of dynamic adjustment point compensation among Fig. 3 D in detail, described in detail below.

Fig. 3 A-3D illustration the flow chart of the OLPC algorithm that detects of imperfect DTX of expression compensation.With reference to figure 3A, by entering initialization block 3102, algorithm begins.Discuss about state table as top, any amount of incident can be used as the trigger event that enters algorithm and use.After the initialization, algorithm proceeds to square frame 3110, and it waits for the arrival of next Frame at this.When on the basis of a frame one frame when sending the DTX signal and judge, can be on the basis of a frame one frame update algorithm easily.Yet, not on the basis of a frame as if transmission DTX signal is judged,, detect wrong correct estimation as if DTX and carry out at another ratio if require to reduce the complexity of calculating, or if other reasons exists, then algorithm can be updated on more low-frequency basis than frame rate.Similarly, coefficient can carry out the renewal of algorithm in the speed higher than the frame rate of required feature.

In case a frame arrives receiving terminal, algorithm proceeds to square frame 3112, carries out DTX at this and detects.As discussed above, the DTX detection algorithm typically returns to three indications of inspection frame one.The DTX detection algorithm of square frame 3112 expressions will typically return a good frame indication, a deletion or a DTX.DTX detects can be based on the capacity of this frame or based on the combination of the coefficient that comprises received signal intensity and received signal SNR.Frame can comprise the signal quality index, such as cyclic redundancy check (CRC) bit of the existence of bit mistake in parity bits or the permission good frame of DTX detection check or this frame.Difference between deletion and DTX can rely on the SNR that received or the measurement of some other signal quality.

And then DTX detects in the square frame 3112, and algorithm proceeds to square frame 3120 and detects the DTX detection algorithm and whether determine that a good frame has been sent out.If detect a good frame, then algorithm advances to square frame 3122.In the square frame 3122, reduce power control with default downward quantity and adjust point.This reduction is the typical fixedly reduction of predetermined number of using in the power control adjustment point.Alternatively, can reduce with dynamic quantity and adjust point, for example, about the E that is received _b/ N _tQuantity.Flow chart proceeds to the point 3200 of the flow chart of the flow chart of connection layout 3A and Fig. 3 B from square frame 3122.Point 3200 is not a functional unit, shows the interconnective point of several flow charts but be equivalent to one.

If the DTX detection algorithm does not produce a good frame indication, then return square frame 3120, flow chart advances to square frame 3130 and detects whether detect a deletion.If deletion detects the output that is defined as the DTX detection algorithm in the square frame 3130, then flow chart proceeds to square frame 3132.

The OLPC algorithm is counted by the quantity that the deletion that taken place is detected, the processing procedure of the DTX amount detection that begins to be out of one's reckoning.In square frame 3132, algorithm initialization deletion counting is 1.Next algorithm proceeds to square frame 3134, is taken as the history adjustment point value that is defined as Old_Setpoint at this current adjustment point value and stores.Next flow chart proceeds to square frame 3136, increases power control at this by default upwards quantity and adjusts point.Point is adjusted in power control typically to be increased by default fixed value, although can use dynamic value.Increase in square frame 3136 in case point is adjusted in power control, flow chart proceeds to and is used for the point 3300 of connection layout 3A flow chart to Fig. 3 C flow chart.

Do not take place if deletion detects, then return square frame 3130, flow chart proceeds to square frame 3140.Algorithm defines a DTX and detects generation in the square frame 3140.The square frame of front has determined that the frame that is received not to come detected as good frame or deletion.Therefore, the DTX detection algorithm detects the DTX frame probably, thus in determination block, have no reason verification this.If the capable frame type of determining more than three of DTX detection algorithm then needs a determination block.In case determine to receive the DTX frame at square frame 3140 flow charts, algorithm turns back to the arrival that square frame 3110 is waited for next frame.

With reference to figure 3B,, can arrive this flow chart from the flow chart of Fig. 3 A or Fig. 3 C along with a good frame indication.Point 3200 expressions enter the inlet of this part of OLPC algorithm.Arrival at the next frame of square frame 3210 algorithm waits.Along with the arrival of this frame, algorithm proceeds to the DTX detection algorithm of square frame 3212, has feature as good frame, deletion or a DTX at the frame that this received.In case the DTX detection algorithm is done, flow chart proceeds to square frame 3220, detects whether the DTX detection algorithm determines to receive a good frame.If good frame of DTX detection algorithm indication, then algorithm proceeds to square frame 3222, adjusts point at this and is reduced with default downward step-length.The OLPC algorithm returns square frame 3210 then and waits for next frame.Yet if good frame is not detected, algorithm proceeds to square frame 3230, detects whether deletion of DTX detection algorithm indication of square frame 3212 at this algorithm.If do not indicate any deletion, then algorithm proceeds to square frame 3240, determines that at this DTX detection algorithm of square frame 3212 indicates remaining frame type DTX.Algorithm turns back to square frame 3210 and waits for next frame then.

If algorithm is determined deletion of indication, then return square frame 3230, flow chart proceeds to square frame 3232 and begins counting deletion indication.In square frame 3232 deletion counting values of being initialized to 1.Next, at square frame 3234, algorithm stores is adjusted point value as history, the adjustment point value of Old_Setpoint.Flow chart proceeds to square frame 323 then, adjusts here and presses the increase of default upwards step value.Flow chart progress point 3300 then, and it is represented to the linking point of flow chart shown in Fig. 3 C.

With reference to figure 3C,, both can also can arrive entrance 3300 from Fig. 3 A from the flow chart of Fig. 3 B along with the deletion indication.From put 3300 enter into shown in Fig. 3 C flow chart the time, algorithm proceeds to the arrival that square frame 3310 is waited for next frame.After next frame arrived, algorithm proceeded to square frame 3312, carried out the DTX detection algorithm at this.

Along with finishing of DTX detection algorithm, flow chart proceeds to square frame 3320, determines whether to detect a good frame.If do not detect good frame, then flow chart proceeds to square frame 3330, detects the DTX detection algorithm of square frame 3312 and whether indicates deletion.If not indication deletion, program proceeds to square frame 3340, judges that at this DTX is instructed to.After the square frame 3340, flow chart turns back to square frame 3310 to wait for next frame.

Turn back to square frame 3330, if the deletion of indication really of DTX detection algorithm, then flow chart proceeds to square frame 3332, and the value in the deletion counting increases progressively 1 here.Flow chart proceeds to square frame 3334 then, increases power control by default upwards step-length and adjusts point.Flow chart turns back to 3310 to wait for the arrival of next frame then.

Turn back to square frame 3320, detect good frame indication at this algorithm, if algorithm is determined good frame of DTX detection algorithm indication of square frame 3312, then flow chart proceeds to square frame 3322, reduces power control at this with default downward step-length and adjusts point.Next flow chart proceeds to square frame 3324, determines to adjust the some offset at this, and is applied to power control adjustment point.Among the embodiment, adjusting the some offset is a default penalty constant value, and in another embodiment, adjusting the some offset is dynamically to be determined by an algorithm shown in Fig. 3 D.Be determined and use in case adjust the some offset, flow chart proceeds to square frame 3326, and being reset at this deletion counting is zero.It is zero that the deletion counting can be reset, because adjust the application of some offset in the square frame 3324, for point is adjusted in the control of the pseudo-deletion indication of all accumulative totals compensation power.Flow chart proceeds to the point 3200 of connection layout 3C flow chart to Fig. 3 B flow chart then.

Square frame 3324 illustrates as determining and using the square frame of adjusting the some compensation in Fig. 3 C, shows in detail in Fig. 3 D.Adjust the some backoff algorithm and enter square frame 3400.Whether flow chart at first proceeds to square frame 3402, continuous with the previous frame sequence number from the good frame that receives previously at this number of frames that detects the good frame that receives.Number of frames has been defined in the more upper strata of CDMA2000, and is the indication of the order of institute's transmit frame.If number of frames is continuous, then flow chart proceeds to square frame 3404, adjusts point at this and is set to the historical value of adjusting point value OLD_Setpoint.The indication of successive frame sequence number, what no human relations deletion count value is, lost without any frame between two nearest good frame indications.Therefore, square frame 3404 replacement adjustment point values are to equal previous good frame indication history value afterwards.From square frame 3404, flow chart proceeds to square frame 3430, in this end.

Turn back to square frame 3402, if number of frames is not continuous, because actual deletion takes place nearest good frame.Next flow chart proceeds to determination block 3408, compares with predetermined constant N at this deletion counting.Predetermined constant N represents that power control adjustment names a person for a particular job with adjusting before a some backoff algorithm is compared the number of threshold values of the essential deletion detection that takes place between continuous good frame detects.The value of selecting for N changes with the design of receiving terminal and the realization of DTX detection algorithm.When the output of self-confident DTX detection algorithm when being high, preferable is to be that N selects a higher numeral.Similarly, if the output of DTX detection algorithm is incredible, may preferablely be to select a lower numeral for N.The numeral of selecting for N is inversely proportional to substantially and with the ratio of the error detection of DTX detection algorithm.When the statistics of not knowing the DTX detection algorithm or not estimation to needed during from reliability, by under various service conditionss, changing N and detecting actual FER and obtain the N numeral by rule of thumb.

If the deletion counting does not exceed threshold value N, then flow chart proceeds to square frame 3430 and finishes.In this environment, if the deletion counting does not exceed threshold value N, it is impossible take place that pseudo-deletion detects.Therefore, the numeral of error detection is estimated as zero, and power control adjustment point is not compensated.

Turn back to determination block 3408, if the deletion counting surpasses threshold value N really, it is possible that so pseudo-deletion detects.Flow chart proceeds to square frame 3410, comes that point is adjusted in the power control of compensation and does an estimation.At square frame 3410, algorithm be provided with power control adjust point for historical adjust point and reception SNR that good frame is measured add a minimum value of presetting well-to-do value D.Here it is, and algorithm is provided with adjusts point for equaling min (OLD_Setpoint, the SNR+D that measures), at this OLD_Setpoint, the SNR+D that measures all be the value of representing with dB with presetting well-to-do value D.Use the E that measures for good frame as mensuration SNR value _B/ N _tBe easily.

Default well-to-do value D represent the well-to-do value more than the SNR that measures.Algorithm is with the well-to-do value and the SNR addition of measuring, and relatively sum is adjusted point with history.D can be the constant value of presetting or dynamically determine.The occasion that D dynamically determines can be according to the quality regulated value of institute's received frame.The quality that is used for institute's received frame can be the signal to noise ratio counting.As an example,, then can reduce default well-to-do value D if wrong number of symbols surpasses threshold value.Equally, if symbol error quantity is higher than threshold value, then can increase default well-to-do value D.No matter default well-to-do value D determines, the value of adjusting point is compensated for as the minimum value of the OLD_Setpoint and the SNR+D that measures.

Next flow chart proceeds to square frame 3420, determines that whether the adjustment point needs to be reset is that minimum is adjusted point value.Square frame 3420 is optionally, and the designer can select to get rid of the adverse effect to the OLPC algorithm performance.The minimum point value of adjusting, Min_Setpoint, the default point value of adjusting of minimum that expression takes place based on reliable communication.In square frame 3420, algorithm is provided with and adjusts point is that (Min_Setpoint Setpoint), represents the default minimum dB value of adjusting point value at this Min_Setpoint to max.In case the adjustment point also is conditioned as required with the comparison of minimum adjustment point value, algorithm proceeds to square frame 3430 and finishes.

Therefore, can see that the OLPC algorithm counts is deleted the quantity of indication, determine the estimated value of the quantity that erroneous frame detects from Fig. 3 A-3D.Then, adjust some offset part and determine, and when detecting good frame, be applied to power control and adjust point based on the quantity that deletion detects.Along with each compensation of point is adjusted in power control, it is zero that the counter that is used to follow the tracks of the quantity that deletion detects is reset.

Fig. 4 shows that change threshold counts the FER figure of the value of N.Carry out the OLPC algorithm at MS forward OLPC is provided, and expression is applicable to the radio that moves in the honeycomb frequency bandwidth, has single path, 1km/h speed, be configured to as defined radio configuration 3 in the CDMA2000 standard, use the 2X data rate, and the data of moving on the convolutional encoding data.OLPC is configured to target FER0.167.As seeing from Fig. 4, more little threshold value N causes high more FER, and big more FER causes more the FER near target FER.High equally more threshold value N causes low equally more FER, but the forward link capacity that consumption reduces.

Fig. 5 shows the FER figure of the changing value of well-to-do value D, all disposes as Fig. 4 at this OLPC, link parameter and MS.As seen in Fig., FER increases with the well-to-do value that reduces, and more than three well-to-do value near target FER.Yet, high more well-to-do value D, many more OLPC cause reducing potentially link capacity as not compensated loop operation.When still keep allowing when not compensating OLPC more the OLPC of high power capacity adjusts point, the value of D equals 2 provides FER to trade off.The 2dB value is not a definite numeral.Depend on that OLPC exchanges the sensitiveness and the ability of the hardware that is used for realizing at this numerical value of memory expression of integral point value, other value of D can equal 2dB in fact.

Table 1 has shown the performance of the various MS configurations of using forward OLPC algorithm.Operation in the radio configuration 3 that each MS is configured to define in as the CDMA2000 standard, and each MS is configured to have target FER 0.167.MS is different in data rate (at this X value representation 9600bps) from 2X to 16X changes, and this data or by convolutional encoding, or is encoded by turbo.The N value is set as 10 deletions, and default well-to-do value is made as 2.

Table 1

Data rate	Target FER	Actual FER
			RC3,16X, convolution code	16.7％	20.9％
RC3,2, Turbo code	16.7％	17.0％
			RC3,16X, Turbo code	16.7％	19.5％

An alternative embodiment that adopts the OLPC of DTX detection is described below.This embodiment reduced significantly cause external loop-around converge too high FER wrong DTX indication influence and cause the influence of the puppet deletion indication of integral point too to a high-profile.

The initial prerequisite that need satisfy the optimal function that target solves is as follows:

A-P (E|D) is relatively little, is less than or equal to 10%

B-P (D|E) is less than or equal to 60%

C-P (D|E) is a constant completely, when communication channel condition changes (different MS speed and different multi-path data charts)

Under the ungratified situation of prerequisite c, can comprise that other enhancing compensates this.This enhancing can comprise the estimation of channel condition.

Prerequisite above the cdma wireless communication system of DTX that utilizes great majority satisfies.The emulation of IS-2000 reverse link shows R-DCCH, P (E|D)=be similar to 0.1%, and P (D|E)＜=55%, and satisfy c in most applications.Development OLPC comes the technology of error of compensation DTX indication, considers that hypothesis satisfies prerequisite b and c, and offset item is included among the such external loop-around target FER of FER that the actual FER that reaches equals to expect.This penalty coefficient is a function.Particularly, external loop-around target FER can calculate as following:

The desired target FER* of external loop-around target FER=(1-P (D|E))

In the simple version of target OLPC algorithm, for P (D|E) selects a constant value and is used to calculate external loop-around target FER.More complicated realization can be based on the estimation of communication channel condition, dynamic selective value.This method of back can be used to improve performance, when especially not being satisfied as if prerequisite c.By utilizing penalty coefficient, the possibility that converges to higher FER on power control loop road is to greatly reduce.

Fig. 6 shows the functional-block diagram be used to compensate the FER compensation square frame 600 that imperfect DTX detects, and when frame is actual when being deletion, the DTX detection algorithm is indicated DTX at this.Desired target FER is input to FER compensation square frame 600.Desired destination FER can be the value of appointment in standard or the operation guide, maybe can determine by calculating the desired FER of acquisition service quality desired level.Desired destination FER connects first input of multiplier 610.Multiplier 610 has second input that zoom factor is provided.If channel does not have the condition possibility of DTX ability or pseudo-DTX, P (D|E) is zero, and it is single that zoom factor will equal.

Yet, in can the channel of DTX, the non-zero ratio that the imperfect performance that DTX detects causes pseudo-DTX to detect.Therefore, the zoom factor that offers multiplier 610 will not be single.Actual zoom factor calculates by the condition ratio that the DTX that is out of one's reckoning detects.State as top, the estimation of P (D|E) can be based on the prerequisites of constant communication channel completely, or can be based on the estimation of communication channel.When the value of P (D|E) will dynamically be determined, communication channel condition was collected into function square frame 640, and offered P (D|E) estimation device 630.When channel condition was assumed that completely constant, communication channel condition collects square frame 640 and P (D|E) estimation device 630 is optional.Communication channel condition can be collected or estimation from the variation of resource, includes but not limited to closed loop power control command average, initial open loop power control estimation, the signal strength signal intensity that forward link receives, if slow or the operation record of rapid fading or the actual estimation of channel condition are useful words.P (D|E) estimation device 630 received communication channel conditions, and carry out the estimation of P (D|E) value.The output of P (D|E) estimation device 630 is connected the zoom factor square frame 620 that this actual zoom factor is confirmed as (1-P (D|E)).When the supposition channel condition is completely during constant, zoom factor square frame 620 can be exported a constant.P (D|E) value shows to representative channel condition and DTX detection algorithm it is to be lower than 55% in emulation.If P (D|E) is estimated as 0.55 correspondence 55%, then zoom factor equals 0.45.No matter the output of zoom factor square frame 620 still is constant dynamically, is used as second input and offers multiplier 610.Result's output of multiplier 610 is the output of FER compensation square frame 600, expression external loop-around target FER.

Aspect other one, (incident be DTX but the DTX detection algorithm announces that it is deletion) when before having increased the toning integral point, improved the technical operation of OLPC and adjusted point to lower power control because pseudo-deletion when determining.Adjusting the calculating of point is described by a finite state machine.

At first, the component below the definition.

SETP_UP_STEP_SIZE=increases the step-length of adjustment point to giving the FER that sets the goal

SETP_DOWN_STEP_SIZE=reduces the step-length of adjustment point to giving the FER that sets the goal

N_DTX_S0_TO_S1=makes from state 0 to state the quantity of the continuous DTX incident that 1 trigger changes

N_DTX_LOWER_SETPOINT=makes the quantity of the continuous DTX incident of trigger adjustment point reduction

S2_COUNT=gets back to the quantity that state machine before the state 0 is retained in the frame of state 2

S3_COUNT=gets back to the quantity that state machine before any other state is retained in the frame of state 3

K=is used to control the changeable factor of adjusting the some reduction in state 3.Default value is 1.

State description and corresponding variation are as follows:

State 0:

External loop-around is typical, uncompensated as one, and external loop-around realizes that promptly in the reception of deletion, adjusting point increases SETP_UP_STEP_SIZE, in the reception of good frame, adjusts point and reduces SETP_DOWN_STEP_SIZE.In the reception of DTX indication, it is constant to adjust point.

If the continuous DTX indication of N_DTX_S0_TO_S1 has been received, transform to state 1.Otherwise be retained in state 0.

State 1:

If receive good frame, press SETP_DOWN_STEP_SIZE and reduce the adjustment point, and transform to state 0.

If receive deletion, pressing SETP_UP_STEP_SIZE increases the adjustment point, S2_COUNT=1 is set and transforms to state 2.

If receive DTX, do not change the adjustment point, and be retained in state 1.

State 2:

If receive good frame, press SETP_DOWN_STEP_SIZE and reduce the adjustment point, S2_COUNT=0 is set and transforms to state 0.

If receive deletion, pressing SETP_UP_STEP_SIZE increases the adjustment point, increases progressively S2_COUNT and is retained in state 2.

If receive DTX, do not change the adjustment point, S3_COUNT=1 is set and is changed to state 3.

State 3:

If receive good frame, press SETP_DOWN_STEP_SIZE and reduce the adjustment point, S2_COUNT=0 is set, S3_COUNT=0 also transforms to state 0.

If receive deletion, pressing SETP_UP_STEP_SIZE increases the adjustment point, increases progressively S2_COUNT, S3_COUNT=0 is set and is changed to state 2.

If receive DTX, just do not change the adjustment point, and increase progressively S3_COUNT.

After each frame, the update mode machine.Along with each renewal of state machine, the comparison that adds determines whether the predetermined number (N_DTX_LOWER_SETPOINT) of continuous DTX indication takes place.Comparison along with each state machine change is performed with following pseudo-code.

If[if] (S3_COUNT＞=N_DTX_LOWER_SETPOINT)

{

If[if] (S2_COUNT＞0)

{

decrease?setpoint?by?S2_COUNT*SETP_UP_STEP_SIZE*K

[press S2_COUNT*SETP_UP_STEP_SIZE*K and reduce the adjustment point]

Set[is provided with] S2_COUNT=0

Set[is provided with] S3_COUNT=0

}

}

Flow chart shown in Fig. 7 A-7D and opinion have been described the calculating that OLPC adjusts point.Calculating begins at an A7100.Point A7100 is not the function square frame, but indication gets the hang of 0.The frame that the algorithm waits next one will be determined in 7102.Algorithm shown in Fig. 7 A-7D is along with the reception of each frame moves.Receive a frame, and determine it is good frame, deletion or DTX after one of them, next program determines that this frame exchanges integral point what influence is arranged.Algorithm detects this frame and whether is defined as a good frame 7110.If this frame is defined as a good frame, then program proceeds to square frame 7114, reduces with default quantity at this and adjusts point, represents with SETP_DOWN_STEP_SIZE.The OLPC program is constantly searched to keep and is satisfied the desired minimum power of required service quality.Along with the minimizing of adjusting point, the DTX counter in the program zero setting square frame 7116, and turn back to square frame 7102 and wait for next frame.If the frame that detects in square frame 7110, be defined as not being good frame, then program proceeds to square frame 7120.

At square frame 7120, whether program detects deletion and is detected.As previously mentioned, the deletion instruct MS sends a frame but the frame that received comprises the bit mistake.If detect deletion at square frame 7120, program proceeds to square frame 7124, and pressing predetermined number here increases the adjustment point.Default upwards step-length represents that with constant SETP_UP_STEP_SIZE it can equal also can be not equal to default downward step-length.The increase of adjustment point causes the power control loop road to signal to MS increases its transmitted power a little, thus the more quality signal that deletion receives in the base station.After adjusting point and increasing, program zero setting DTX counter 7126 also turns back to square frame 7102 and waits for next frame.

If do not detect deletion at square frame 7120, frame must have DTX because this be unique reservation also do not have a detected frame type.Thereby square frame 7130 is determined to detect DTX and is increased progressively continuous DTX counter.What program proceeded to that square frame 7140 determines whether to detect continuous DTX frame then represents the preset number of N_DTX_S0_TO_S1 with constant.If the indication of the preset number of DTX does not arrive continuously, program turns back to square frame 7103 and waits for next frame.If the indication of the preset number of DTX arrives continuously, program proceeds to state 1 beginning, and B7200 represents with point.

Arrive Fig. 7 B continuously at a B7200, program proceeds to square frame 7202, waits for next frame at this.Along with the reception and the characterization of next frame, program proceeds to square frame 7210 and detects whether receive good frame.If continuously receive good frame after the indication of the quantity of DTX, then current adjustment point more than or equal to obtain the desired minimum adjustment point of required QoS.Program reduces with default downward step-length 7214 adjusts points, zero setting DTX counter 7216, and turn back to state 0 by an A7100.

If do not detect good frame at square frame 7210, if next program proceeds to square frame 7220 and detect whether detect DTX., then program is retained in state 1 and returns square frame 7202 and wait for next frame.If do not detect DTX, then only a frame type keeps, thereby program proceeds to square frame 7230, determines whether to detect deletion at this.Program is carried out at square frame 7232 zero setting DTX counters, adjusts point by the increase of default upwards step-length in square frame 7234, in square frame 7236 S2_COUNT is initialized as 1, and proceeds to state 2 by a C7300.

With reference now to Fig. 7 C,, the some C7300 state 2 that provides access.At state 2, program is waited for the reception and the characterization of next frame at square frame 7302.Program proceeds to square frame 7310 and detects whether the frame that receives is good frame then.If always, good frame detect indication adjust point probably or greater than keeping the desired minimum value of required service quality.Thereby program reduces in the default downward step-length of square frame 7314 usefulness adjusts point, is zero at square frame 7316 replacement S2_COUNT, at square frame 7318 zero setting DTX counters, and turns back to state 0 (Fig. 7 A) by an A7100.

If do not detect good frame, detect whether detect deletion in square frame 7320 programs at square frame 7310.If, the numeral that detects along with the continuous DTX of indication in state 0 then may be adjusted a little too lowly, but also may indicate pseudo-a deletion.Thereby at square frame 7324, program increases by default upwards step-length adjusts point, increases progressively S2_COUNT at square frame 7326 then, and track algorithm return back to state 0 (Fig. 7 A) before, treats the quantity of frame in state 2.Because detect the frame except DTX, next program proceeds to square frame 7328, and zero setting DTX counter, and is retained in state 2, returns square frame 7302 to wait for next frame.

If do not detect deletion in square frame 7320, then program moves to square frame 7330, and indicates the detected DTX of being.If this point in algorithm has arrived, do not detect good frame, DTX detection algorithm or rate detection algorithm have detected the quantity of DTX and delete frame.Program proceeds to square frame 7332 and initialization S3_COUNT is 1 then, proceeds to state 3 by a D7400 then.

With reference to figure 7D, get the hang of 3 by a D7400.In the state as all fronts, by waiting for and detecting next frame, at square frame 7402 initial states 3.Along with the detection of frame, program moves to square frame 7410 and detects whether detect good frame.

If detect good frame, reducing the adjustment point in square frame 7412 programs with default downward step-length, is zero at square frame 7414 replacement S2_COUNT, is zero at square frame 7416 replacement S3_COUNT, at square frame 7418 zero setting DTX counters, and by A7100 return state 0 (a Fig. 7 A).

If do not detect good frame at square frame 7410, program moves to square frame 7420 and detects whether detect deletion.If, program increases by default upwards step-length at square frame 7422 adjusts point, increases progressively S2_COUNT at square frame 7424, at square frame 7426 replacement S3_COUNT, and at square frame 7428 zero setting DTX counters, and by some C7300 return state 2 (Fig. 7 C).

If do not detect deletion at square frame 7420, then program moves to square frame 7430 and indicates and detects DTX.Next program moves to square frame 7432 and increases progressively S3_COUNT, comes track algorithm to treat number of frames at state 3 before entering any other state.Next carry out the S3_COUNT compensation in square frame 7440 programs, and return square frame 7402 at state 3 and wait for next frame.

The S3_COUNT compensation program of square frame 7440 is described in detail among Fig. 8.At square frame 810, whether the detection S3_COUNT value of program initialization is more than or equal to the default value of representing with constant N _ DTX_LOWER_SETPOINT.Behind the arrival state 3, in fact S3_COUNT follows the tracks of the quantity that continuous DTX detects indication.Between the extended peroid of DTX, the quantity of DTX indication is tracked continuously, and the puppet deletion that allows the compensation of OLPC program to be discovered detects indication.If determine the S3_COUNT value less than default value at square frame 810, then program moves to square frame 840, and the indication compensation program finishes.If determine that at square frame 810 the S3_COUNT value equals or exceeds predetermined threshold value, then whether detect the S2_COUNT value greater than zero in square frame 820S3_COUNT compensation program 7440.If S2_COUNT is zero, then compensation program moves to square frame 840, in this end.If the S2_COUNT non-zero then reduces with the quantity that equals S2_COUNT*SETP_UP_SETP_SIZE*K in square frame 830 compensation program and adjusts point.K is one and is used for the constant that the metrophia compensation program allows the adjustment number of spots of minimizing.If K is set to 1, the S3_COUNT compensation program negates any increase of adjusting in the point, thinks that pseudo-deletion detects.After reducing the adjustment point, compensation program moves to square frame 832 and the S2_COUNT that resets is zero, is zero at square frame 834 replacement S3_COUNT then.The S3_COUNT compensation program moves to square frame 840 then, in this end.

In the state diagram of Fig. 9 succinct demonstration OLPC adjust a some algorithm.Algorithm is in state 0 (910) beginning.Advance to state 1,914 according to incident " A " state machine, the quantity that is defined as continuous DTX frame at this " A " equals N_DTX_S0_TO_S1.On incident " A ", adjust point or state counter without any variation.To any A (NOT A) incident 912, state machine is retained in state 0 (910).If A incident 912 is to substitute deletion, adjusts and press the SETP_UP_STEP_SIZE increase.If A incident 912 is good frames, then adjusts point and be reduced with SETP_DOWN_STEP_SIZE.If A incident 912 is DTX, then exchange integral point without any variation.

Any DTX is detected 922 and adjust point or any state counter without any the incident that changes, and state machine is retained in state 1 (920).If when at state 2 (920), a good frame incident 924 is arranged, then state machine turns back to state 0 (910).Good frame incident 924 also causes adjustment to press the SETP_DOWN_STEP_SIZE minimizing.If state 2 (920), incident are deletions 926, then adjust and press the SETP_UP_STEP_SIZE increase, and S2_COUNT are set as 1.State machine also advances to state 2 (930).

At state 2 (930), deletion event 932 causes adjusting to be pressed the SETP_UP_STEP_SIZE increase and increases progressively S2_COUNT.Along with this incident, state machine is retained in the state 2 (930).If good frame incident takes place 934, state machine turns back to state 0 (910), press SETP_DOWN_STEP_SIZE and reduce the adjustment point, and replacement S2_COUNT is 0.When at state 2 (930), DTX incident 936 takes place, and causes state machine to advance to state 3 (940).Adjust the result not variation of point, but S3_COUNT is initialized to 1 as this incident.

At state 3 (940), DTX incident 942 causes adjusting point and does not change, but S3_COUNT increases progressively.Along with DTX incident 942, state machine is retained in state 3 (940).If this incident is good frame 944, then state machine turns back to state 0 (910), press SETP_DOWN_STEP_SIZE and reduce the adjustment point, replacement S2_COUNT be 0 and replacement S3_COUNT be 0.When at state 3 (940), deletion event 946 causes increasing by SETP_UP_STEP_SIZE adjusts point, and increasing progressively S2_COUNT and replacement S3_COUNT is zero.

Those personages that are skilled in technique will understand that information can represent with any different science and technology and technology with signal in the industry.For example, data, instruction, order, information, signal, bit, symbol and describe on whole by the chip of reference can be represented with voltage, electric current, electromagnetic wave, magnetic field or particle, light field or particle or any their assembly.

Those technology personage further recognizes in the industry, can be used as electronic hardware, calculator software or the combination of the two at logic block, module, circuit and the algorithm steps of these various explanations of describing in conjunction with the embodiments and realizes.In order clearly to describe this interchangeability of hardware and software, the assembly of various descriptions, square frame, module, circuit and step are considered their function usually, have described in the above.No matter be the such function that realizes as hardware or software, all based on the special applications of forcing at whole system and design constraint.The personage that is skilled in technique can in all sorts of ways and realize described function, but this implementation decision should not explained as deviating from the scope of the invention each special applications.

Logic block, module and the circuit that is combined in the various explanations that this embodiment that discloses describes can adopt general service processor, digital signal processor (DSP), application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components or any design to be used for realizing that their combination of function described here realizes or carry out.The general service processor can be a microprocessor, but alternatively, processor can be any processor, controller, microcontroller or state machine.Processor also can be used as the parts of computing equipment and realizes, for example DSP and microprocessor, microprocessor, one or more in DSP core microprocessor linked, or the combination of any other such configuration in a large number.

The step of this method described in conjunction with the embodiment that disclosed or algorithm can be directly at hardware, in software module by the microprocessor execution, or in the combination of the two, implement.Software module may reside in RAM memory, flash memory, ROM memory, eprom memory, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or any other form in the industry known to medium in.Exemplary storage medium connects can be from read information and the processor that write information to memory.Processor and medium can reside among the ASIC.ASIC can reside in travelling carriage, base station or the base station controller.In replaceable, processor and medium can be used as discreet component and reside in travelling carriage, base station or the base station controller.

Any one personage that is skilled in technique can carry out or use the present invention to provide the top description of the embodiment that discloses to make in the industry.To easily be presented in the industry in face of those personages that are skilled in technique the various modifications of these embodiment, not deviate from the spirit or scope of the present invention, can be applied to other embodiment in the general rule of this definition.Therefore, the present invention does not plan the embodiment that is restricted in this demonstration, but accords with in the rule of this announcement the widest scope consistent with novel characteristics.

Claims (21)

1. the method that outer loop power control is provided in the communication equipment with discontinuous transmission (DTX) detection is characterized in that, comprises the steps:

The quantity that the frame that is out of one's reckoning detects; With

Regulate the power related and control the adjustment point, wherein determine this adjusting based on the erroneous frame amount detection of being estimated to small part with outer loop power control,

Wherein, described erroneous frame detection is that deletion detects.

2. the method for claim 1 is characterized in that, further comprises detecting good frame, and responds the detection of good frame, causes the adjusting to power control adjustment point.

3. method as claimed in claim 2 is characterized in that, the quantity that described erroneous frame detects is the quantity that the deletion that taken place between continuous good frame detects detects.

4. method as claimed in claim 3 is characterized in that, if the quantity that described deletion detects is less than a predetermined threshold value, what then point was adjusted in control to power is adjusted to zero.

5. method as claimed in claim 4 is characterized in that, described predetermined threshold value is a constant.

6. method as claimed in claim 2 is characterized in that, the value that point is adjusted to the minimum that equals in following these numerical value is adjusted in described power control:

The historical point of adjusting; With

Signal to noise ratio additional one default well-to-do value.

7. method as claimed in claim 6 is characterized in that, described signal to noise ratio is the E of the good frame that detects _b/ N _tValue.

8. method as claimed in claim 6 is characterized in that, current adjustment point and signal to noise ratio all are unit with dB, and described default well-to-do value then is essentially 2dB.

9. the method for claim 1 is characterized in that, describedly is used to regulate power control and adjusts the step of point and comprise:

If the quantity that described erroneous frame detects equals or exceeds a predetermined threshold value, then power control is adjusted point and is set to the default minimum maximum of adjusting in the middle of point value and the current adjustment point value; With

If the quantity that described erroneous frame detects is less than described predetermined threshold value, then power control is adjusted point and is set to current adjustment point value.

10. the method for claim 1 is characterized in that, described outer loop power control is the control of forward outer loop power.

11. the method for claim 1 is characterized in that, described communication equipment is in cdma base station, cdma base station controller and the CDMA travelling carriage.

12. one kind has, and discontinuous transmission (DTX) detects and the Wireless Telecom Equipment of outer loop power control, it is characterized in that, comprising:

The device of the quantity that the frame that is used to be out of one's reckoning detects; With

Be used to regulate the power control related and adjust the device of point, wherein determine this adjusting based on the quantity of described erroneous frame detection to small part with outer loop power control,

Wherein, described erroneous frame detection is that deletion detects.

13. equipment as claimed in claim 12 is characterized in that, further comprises the device that is used to detect good frame, and the described described device that is used to detect good frame of device response that is used to regulate power control adjustment point.

14. equipment as claimed in claim 13 is characterized in that, the quantity that the deletion that the device of the quantity that the described frame that is used to be out of one's reckoning detects is taken place between continuous good frame is detected detects is counted.

15. equipment as claimed in claim 14 is characterized in that, if the quantity that described deletion detects is less than a predetermined threshold value, what then point was adjusted in control to power is adjusted to zero.

16. equipment as claimed in claim 15 is characterized in that, described predetermined threshold value is a constant.

17. equipment as claimed in claim 13 is characterized in that, describedly is used to regulate power control and adjusts the device of point and point is adjusted in power control be adjusted to the minimum value that equals following numerical value:

The historical point of adjusting; With

Signal to noise ratio additional one default well-to-do value.

18. equipment as claimed in claim 17 is characterized in that, described signal to noise ratio is a measured value.

19. equipment as claimed in claim 17 is characterized in that, current adjustment point and signal to noise ratio all are unit with dB, and described default well-to-do value then is essentially 2dB.

20. equipment as claimed in claim 12 is characterized in that, describedly is used to regulate power control and adjusts the device of point and comprise:

If the quantity that described erroneous frame detects equals or exceeds a predetermined threshold value, then power control is adjusted point and is set to the default minimum peaked device of adjusting in the middle of point value and the current adjustment point value; With

If the quantity that described erroneous frame detects is less than described predetermined threshold value, then the device that point is set to current adjustment point value is adjusted in power control.

21. equipment as claimed in claim 12 is characterized in that, described Wireless Telecom Equipment is in cdma base station, cdma base station controller and the CDMA travelling carriage.

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