CN1751468A - Data transmission method - Google Patents

Abstract

The present invention relates to a data transmitting method which is used between the transmitting side (BS,MS) and the receiving side (MS,BS) with the wireless data channel of the communication network (CN), the method comprises the following steps: The transmitting side transmits the data to the receiving side, wherein, the transmitting is characterized with at least one transmission parameter, the transmission parameter is chosen according to the first channel quality of the wireless channel which is known to the transmitting side; the receiving side receives the data; the receiving side affirms the first channel quality known to the transmitting side according to the data of the using transmission parameter, besides it confirms the current second channel quality according to the quality data of the received data; the receiving side compares the first channel quality to the second channel quality.

Description

The method that is used for transfer of data

The present invention relates to a kind of between transmit leg and recipient the method via the radio data channel transmission data, wherein, regulate data transmission parameters according to the radio data quality of channel.

When the sending direction recipient is transmitted data, importantly, these data arrive the recipient with gratifying quality on the one hand, and realize transfer of data in the least possible mode that accounts for resource on the other hand.

In order to make data wrong insensitive on the transmission path, data are encoded.In addition, particularly in wireless communication networks transmit leg its transmitted power and transmission conditions are complementary.

In order to be fit to the coding of current transmission, transmit leg must be known the quality of reception at the recipient place.In the scope of adaptive coding, can mate modulation scheme (Modulationsschema) and encoding rate.In this, in mobile radio communication, be also referred to as adaptive modulation and coding (adaptiv Modulation and Coding, AMC).Modulation scheme can be interpreted as that the signal that depends on the information of carrying changes the method and the mode of carrier wave.QPSK modulation scheme (quadrature phaseshift keying, Quadrature Phase Shift Keying) or 16QAM (Quadrature AmplitudeModulation, quadrature amplitude modulation) are for example arranged in the mobile wireless electrical domain.Transmit encoding rate illustrative examples such as each second how many kilobits (Kbps).

Often modulation scheme is expanded to modulation and encoding scheme MCS, wherein, encoding rate is described additionally also except modulation scheme.

This will be below by means of specific communication network, be that a example in the UMTS mobile radio system comes The effect, at first introduce some notions for this reason:

Employed notion

Communication system or communication network are a kind of structures that is used for swap data.This can for example be cellular mobile radio network, such as GSM network (Global System of MobileCommunications, global system for mobile communications) or UMTS network (Universal MobileTelecommunications System, Universal Mobile Telecommunications System).Operated by rotary motion has terminal and base station in communication system.In UMTS, communication system or wireless radio transmission network have a plurality of at least base stations (being also referred to as " Node B " here), and have radio net control unit or the radio network controller (RNC) that is used to connect each base station.Terrestrial radio Access Network or " universal terrestrial radio electricity Access Network " UTRAN are the radiotechnics parts of UMTS network, for example also provide radio interface in this radiotechnics part.Radio interface is determined, for example modulator approach, bandwidth, frequency shift (FS), cut-in method, is guaranteed the overall of process or switching technology by the physics of standardization and definition of data exchange and agreement.Therefore, URAN also comprises a plurality of at least base stations and at least one RNC.

Can stipulate different radio transmission techniques in cellular mobile radio system, how these radio transmission techniques definition distribute the physics connection resource.Under the situation of UMTS, be provided with at present the frequency division multiplexing pattern (Frequency Division Duplex, FDD) and different time division multiplexings (Time Division Duplex, TDD).Under fdd mode, on different frequency, realize the transfer of data that so-called " up link " is connected with " down link " by channeling, and under two kinds of tdd modes, on identical frequency, realize the transfer of data that uplink and downlink connect by time division multiplexing.

The base station is the central location in the communication network, and this central location is served terminal or communication terminal device in the sub-district of mobile radio telephone network via one or more radio channels under the situation of cellular mobile radio network.The base station is provided at the air interface between base station and the terminal.It is born and the carrying out of mobile subscriber's radio work (Funkbetriebs), and the dedicated radio link of monitors physical.In addition, it gives terminal with useful information and status information transmission.The base station does not have function of exchange, but only has supplying functional.The base station comprises at least one transmission/receiving element.

Terminal can be a communication terminal device arbitrarily, and the user communicates in communication system by this communication terminal device.For example mobile radio terminal apparatus or the portable computer that has a radio module just belong to terminal.Terminal also often is known as " mobile radio station " and (MS) or in UMTS is known as " subscriber equipment " (UE).

In mobile radio, between two closure, distinguished.Forward or " down link " (DL) are represented transmission direction from the base station to the terminal.Oppositely (up link, UL) the opposite transmission direction of expression from terminal to base station.

In the wideband transmission system such as the UMTS mobile radio telephone, channel is the part of operational total transmission capacity.In the application's scope, wireless communications path is called as radio channel.

In mobile radio system, for example UMTS, for transfer of data, there are two kinds of physical channels: dedicated channel (Dedicated Channels) and common signal channel (CommonChannels).On dedicated channel, physical resource only is preserved at a certain terminal information transmission.On common signal channel, can transmit plan at all terminal information, the public substantially physical control channel in the down link (Primary Common ControlPhysical Channel (P-CCPCH)) for example, perhaps all terminals are shared physical resource in the following manner, and promptly each terminal only allows the short time to use this physical resource.For example that's how things stand in the Physical Random Access Channel (Physical Random Access Channel (PRACH)) of up link.

When transmitting via common signal channel or dedicated channel, except by means of the bandwidth spread spectrum that is used to make the spread spectrum coding that transmits robust more or " Channelisation Codes ", data also additionally experience be used to identify scrambling (Scrambling) process of specific connection.For this reason, depend on transmission direction, channel type and radio transmission techniques and adopt dissimilar scrambler (scrambling code).

Bit in the data sequence is known as code element (Symbol) mostly, and the bit in the sequence behind the bandwidth spread spectrum is known as chip (Chip).

In mobile radio system, except circuit switched (circuitswitched) business, also be provided with, via the form transmission data of this business with bag towards (packet switched) business of grouping such as UMTS.

Expansion to the downlink sharied signal channel (DSCH) that existed is so-called high speed descending sharing channel (HSDSCH), for distribute the control corresponding channel to high speed descending sharing channel, for example " HS-DSCH shared control channel " (HS-SCCH).

In UMTS, determine channel quality under the situation of HSDPA

So far, in order to make transmit leg (for example base station) can understand channel quality at the data receiver place, a message or channel measurement message are sent to the transmit leg of data, based on this message, transmit leg can estimated channel quality, and wherein data are received at the recipient place with this channel quality.Under the downlink transmission situation of the situation of HSDPA, for example flow process is as follows at the UMTS system: mobile radio station sends standardized message or CQI message (CQI:Channel Quality Indicator, channel quality indicator) to the base station.This CQI message comprises about the information by the measured channel quality of recipient with predefined standardized form.Thus, channel quality can be determined in the base station, and wherein data are received at the recipient place with this channel quality.Based on fixed channel quality, the base station selected data transmission parameters that is used for sending data to mobile radio station.These data transmission parameters can for example be modulation scheme, encoding rate or transmitted power.

Certainly, As time goes on channel quality can change.Therefore, send CQI message by mobile radio station to the base station at regular intervals so far, it is also notified to make channel quality to be determined again.

Generally speaking, the transmission of CQI message has solved this problem really, promptly must understand channel quality in transmit leg.Certainly, CQI message also must be sent out and take thus the resource in the transmission in up link that is from the mobile radio station to the base station.On the other hand also with enough accuracy identification channel information, can consider following improvement in order to make the resource load keep as far as possible little on the one hand:

1) CQI message is not all to be transmitted in each frame, that is is not that frequency with maximum possible is transmitted, but in the k frame transmission primaries, wherein, k notifies mobile radio station by the base station.Therefore, transmission characteristic can not change soon when speed is low, and the CQI message transmission rate that reduces is enough.For the mobile radio station of fast moving, wherein channel at any time compole change tempestuously, this is also needed higher transmission rate (that is to say littler k).

CQI message just was transmitted when 2) data decode was failed in the recipient if and if only if.Adopt so-called NACK (negative response, Negative ACKnowledge) with this advisory base station.And then this NACK, mobile radio station should send CQI according to this suggestion, can better regulate afterwards according to this CQI base station.

Certainly, this method also is not enough to solve described problem, and is as follows:

Not too poor when transmission quality but cross when good, generally will correctly receive all message, and not send NACK, but only send ACK (Positives ACKnowledge, positive acknowledgement).But, transmission with good quality is not best equally, because take resource (the particularly transmitted power of base station or the additional interference on every other mobile radio station) thus, these resources are not really to need, and therefore these resources should be used for other connection better.

In addition, not when all or nearly all bag is correctly received at the very start, but when decoding failure under the situation of about 10%-30%, provide the optimum mode of operation of ARQ method (particularly HARQ hybrid ARQ).Though the transmission that necessary in these cases request repeats this means the resource cost of raising, in the time only need being correctly decoded,, can implement transmission on the other hand with significantly lower power than when requiring higher decoding rate with the probability of 70%-90%.In a word, save energy or resource thus.

But, with this realization explicitly, this means, even always when the best is provided with, under the situation of 10%-30%, also to send CQI message, although this is not essential, because this setting has been best and therefore needn't have changed.

Another suggestion is not transmit current channel status at least when speed is high, but transmits mean value in the past by some frames.Background is the following fact, and promptly the characteristic of channel by quick decay decision changes when speed is high so soon, so that out-of-date when arriving the base station about its information.Yet to change slowly many and can be not out-of-date too soon for the common position of mobile radio station and the additional fading channel (promptly so-called " log-normal-Fading ") that produces owing to the nuance of large spatial structure and buckling phenomenon.Eliminate the fluctuation that produces by quick decay by averaging and obtain comparatively accurate mean value.This method does not solve the best problem of transmission fast, but it has improved the understanding about average transmission quality at least.

With this prior art is starting point, and task of the present invention is, a kind of method or a kind of device are provided, and this method maybe this device guarantees to transmit with the transmission parameter that is complementary with transmission conditions, needs the least possible additional capacity of transmission freely simultaneously.

Method or a kind of mobile radio station according to claim 36, a kind of base station and a kind of communication network according to claim 38 according to claim 37 of this task by a kind of feature with independent claims 1 solves.

Favourable expansion scheme of the present invention and improvement project can find in the dependent claims.

Core of the present invention is, and if only if, and the recipient confirms, current applied transmission parameter is not complementary with the transmission situation that is for example crosses good or cross when poor, and the message that is used for channel measurement that the recipient of data will add sends to the transmit leg of data.

Describe the present invention in detail by selected example below, these examples partly also illustrate in the drawings.

Fig. 1 is schematically illustrated in communicating by letter between mobile radio station and the base station in the communication network, and wherein transmission parameter is matched with transmission conditions;

Fig. 2 illustrates a flow chart about the adjustment process of channel parameter;

Fig. 3 illustrates one section extracts of CQI mapping form (CQIMapping table).

Even below with reference to example about the HSDPA transmission, the present invention in its multiple expansion scheme, also not only can be applied to packet switching or towards transmission packets or channel, but also can be applied to transmission continuous or circuit switched (circuit-switched).Equally, needn't be limited to the down link direction, but also can be applied to uplink direction similarly, wherein can consider, opposite with the base station, mobile radio station haves no right the resource in the sub-district is distributed.

In Fig. 1, mobile radio station MS sends message to base station BS, is used for measuring CQI via HSDPA uplink control channel " Dedicated Physical Control Channel (uplink) forHS-DSCH " HS-DPCCH transmission channel.Mobile radio station is measured this channel quality based on the reception of pilot channel and with signaling it is sent in CQI message.In UMTS, applied pilot channel this can be " Primary Common Control Physical Channel " (PCCPC) or " inferior Common Control Physical Channel " (SCCPC).This message CQI that is used for channel measurement is standardized, so that the base station learns at the mobile radio station place have which kind of channel quality.(in UMTS, " Primary Common Control Physical Channel " PCCPC or " inferior Common Control Physical Channel " SCCPC are used for this).When determining channel quality, have the proportionate relationship of being scheduled between the power of supposing HSDPA data channel HS-DSCH and the power of pilot channel, but its deviation can be considered in the base station in case of necessity.Based on institute's channel transmitted quality, base station BS is regulated data transmission parameters, transmits data via HSDPA data channel HS-DSCH from the base station to mobile radio station MS with these transmission parameters.These transmission parameters can be transmitted powers of for example modulation scheme or encoding scheme, encoding rate, base station or the like.Mobile radio station receives by the data of base station with the form transmission of bag.

Mobile radio station MS can determine used which transmission parameter with distinct methods and mode now.

A) in UMTS-HSDPA, transmission is about the information of transmission parameter before bag, and these transmission parameters relate to modulation and encoding scheme MCS.This realizes that on HS-SCCH it was sent out abreast and in time slightly before carrying the HS-DSCH of data.

B) through-put power is not to be transferred to mobile radio station MS in this manner.Therefore mobile radio station also just be can not determine the absolute value of transmitted power, is possible when delivering CQI message via the HSDPA pilot channel for example as it; But only can determine relative value, transmission was good or poor excessively.

The adjustment process of in Fig. 2, schematically having summarized transmission parameter again.

Relation between transmitted power, channel quality and other transmission parameter is as follows:

Modulation and encoding scheme MCS can for example be scaled the signal to noise ratio observed, be the difference of representing with decibel (dB) of mentioned SNR (" Signal to Noise Ratio "), need receive this MCS with given for example 10% bLock error rate for this SNR.Distribute the value of 2dB to give such modulation and encoding scheme MCS, even it also works when the more weak power of two decibels.In this case, " work " to refer to and for example be no more than 10% bLock error rate.

But, under the HSDPA situation, with its applying unit, not as using the numbering of modulation and encoding scheme MCS.A part of listing the table of different modulation and encoding scheme shown in Figure 3, these the modulation with encoding scheme at (robust) that aspect the error of transmission be different robusts.Replacement is represented difference with the dB of unit, also can application references in this table.In this case, 2 expressions should be used two units more modulation and the encoding scheme of robust.When just implementing current transmission with modulation in this table and encoding scheme MCS, this means, should replace it and use the more MCS of robust of two positions.If do not use modulation and encoding scheme in this table just, yet presently used modulation and encoding scheme MCS must be scaled another equivalent modulation and encoding scheme so, then modulation and the encoding scheme MCS according to this equivalence forms described difference.

Except sending at least a portion transmission parameter with signaling, there is such possibility in addition, promptly mobile radio station MS decodes to received packet, and judges original data content or the useful data content that obtains supposition by one group of probability.It can be determined then, and which coding is this useful data content have is ideally described, and determines that therefore unfavorable during the transmission channel quality has to what extent changed this packet.Can determine the error rate, for example bLock error rate thus.

By communication system, can determine by the base station or by mobile radio station, which error rate is acceptable for transmission.

If the error rate of being determined by mobile radio station MS has surpassed a certain predetermined tolerance, the channel measurement that this mobile radio station MS just upgrades by channel measurement message CQI transmission.

This mode has the following advantages:

In time mate transmission parameter by this way, and can not waste transfer resource owing to unnecessarily sending CQI message.This power match can either transmitted under the good situation again and can use transmitting under the poor situation.Good be transmitted in that resource use aspect neither be best even cross, because take the transmitted power of more resources, particularly base station or the additional interference of locating in every other base station, these resources are in fact optional and should be used for other connections better.In addition, particularly for by means of ARQ method (automatic repetitive requests, AutomaticRepeat Request), especially HARQ, hybrid ARQ come the situation of transmission of packet data, when all or nearly all bag correctly are received at the very start, do not produce optimum operation.On the contrary, when the optimum operation that exists during the decoding failure under the situation at about 10-30% for resource.Although must ask to repeat transmission in these cases, this means corresponding higher resource cost and the delay that increases, yet on the other hand, when transmission need only be correctly decoded with the probability of 70-90%, than when requiring higher decoding rate, can implement transmission with significantly less power.In a word, save resource thus.

Another advantage is, considers the channel quality of data channel.The quality of data channel can be for example in the following manner with the quality generation deviation of pilot channel, promptly adopt different scramblers that is so-called " master " and " inferior " scrambler to come these two kinds of channels are carried out scrambling.Scrambler is used for the bandwidth spread spectrum of signal.Because adopt different scramblers to come signal is carried out scrambling, so signal is differently disturbed.Especially, adopt identical scrambler to be subjected to littler interference than the employing different scrambling codes by the signal of scrambling by the signal of scrambling, pilot channel may be disturbed by other transmission generally speaking more than data channel.In this case, then more accurate than the measurement on pilot channel in the measurement on the data channel.In addition, in UMTS, often launch by the base station, wherein via a plurality of antenna emission data with so-called " transmit diversity (Transmit-Diversity) method ".Although mobile radio station MS attempt to consider this method when calculated mass, influenced by different parameters because launch, so can not guarantee, provide accurate result or only gratifying result in all cases by the quality of pilot channel estimation data channel.

Embodiments of the invention

-therefore, message CQI by being used for determining channel quality or affiliated feedback are with the quality informing base station that connects.

Then, main according to the message CQI proposition modulation and the encoding scheme that are used for channel quality, because encoding rate can calculate according to the quantity of sign indicating number and the size of transmission block.

Based on these information and other rules, employed so-called transformat (TF) in down link is determined in the base station.Transformat significantly more accurately, is promptly determined the content of bag in the mode that is accurate to bit, and determines employed for this reason transfer resource.For this reason, transformat TF comprises following information:

The quantity of-employed channel code and identification number.Channel code is used to distinguish single business (Services) or user.

-modulation type

The size of-transmission block

-redundant and constellation version (Konstellatons-Version), it determines accurately which Bit transmits on which position of bag.

-additional the control information of transmission in addition, this additional control information are not first and foremost to be used for determining transformat, yet are essential for the correct processing of bag.

-mixing the identification number of IRQ process, this identification number for example is used under the situation of transmission package repeatedly at decoding correctly with its stack.

-so-called " new data indicator (New-Data-Indicator) ", it helps the transmission of bag is newly separated with the previous repetition transmission range that wraps.

The following describes favourable expansion scheme or its improvement project about single feature of the present invention.

1. tolerance

The tolerance in the signaling grade of CQI feedback and the explanation of deviation, the CQI feedback is corresponding to about 1dB grade.Here, the maximum allowable offset of the tolerance explanation quality of reception, this maximum allowable offset can exist, and can not start the CQI transmission.

At the explanation of too high/low-quality different tolerances, thereby can wittingly high/low quality of service be distributed to mobile radio station, and have only that mobile radio station just sends new CQI when surpass/being lower than this independent threshold value.

The explanation of tolerance can realize as has implemented the front in the explanation as the decibel form, the maximum deviation of this tolerance explanation between the required channel quality of determined channel quality and applied MCS.Show thus must increase how much power or reduce how much power or with how many decibels more robust or more not robust ground work.This tolerance for example can be determined that this mobile radio station itself comes differentiated service with low or high quality of service (Quality ofService) by mobile radio station.In this case, have only when surpassing or be lower than this independent threshold value that is provided with by mobile radio station, mobile radio station just sends the new message CQI that is used for channel measurement.The distribution of corresponding channel quality can certainly be realized by base station side.

2. the adjusting of quality of service

Have a mind to cross packet that good or poor excessively quality sends, to that is to say with the packet that sends than the required better quality of the bLock error rate that reaches defined or worse quality and also can be indicated (signaling information that needs 1 bit) clearly for this reason.So mobile radio station can be ignored such packet and not send CQI.

3. the change of transformat

If can send the conversion of presently used TF to ensuing TF with signaling in the CQI feedback, then relatively whether it is within the tolerance.When converting, calculate TF, but the transmission of power of its each useful data bit is the most close with the transmission of power of each useful data bit of the TF of signalingization.With reference to the form shown in the figure 3, following transformat shows also the transformat that can continue with the non-integer index, for example from index 1 to index 5.7.

This form shows the index that is known as the CQI value.The size of transmission block has been described in secondary series, has that is to say in a transmission block how many bits are arranged.In next column, illustrated how much physics high speed downlink channels HS-PDSCH has been distributed to transmission, in the 4th row, modulation scheme has been described, in the 5th row, the reference power coupling has been described.

4. the coupling of delivery time that is used for the additional messages of channel measurement

When request of data or " packet call " end, may occur, only also remaining fewer bit, these bits are just along with last transmission is sent to mobile radio station.When this last transmission, the size, the quantity of useful byte is matched with transmission conditions no longer best or rather.(yet in addition can mesh power).Thereby may occur at this, with too much energy and therefore the good excessively quality of reception transmit remaining less bit.This will cause, and mobile radio station sends CQI, yet this is unnecessary, because good excessively quality does not have to be conditioned because of the error message about channel characteristics.This can prevent in the following manner, promptly determines, does not send CQI message because of good excessively transmission when being lower than the useful bit of some.When poor excessively transmission, can send CQI message, but can determine that also oneself does not send CQI message, because packet call has almost been pass by and (almost) no longer is worth being optimized.

In addition, can stipulate, only when transmitting the first time of packet and when repeating, send additional CQI, because the transmission that repeats generally can be to be sent out than transmission energy still less for the first time: when repeating to transmit, can make up the transmission that all are transmitted till that time, and provide gross energy thus and the energy of last repetition not only is provided.

Even additional CQI message is not sent out at each (possible) TTI (Transmission Time Interval) yet, but only be sent out in predetermined frame, this frame is reasonably littler than the frame k that sends conventional CQI.This has the following advantages:

By postponing transmission and using the CQI of new transmission, this new CQI after all can not be applied to next frame, but can be typically after the frame more than 7 or 7 (so-called round-trip delay (round trip delay) or answering delay) just be employed.Therefore, just react to the CQI that is transmitted later at 7 frames in the base station, thus nonsensical be that it is wrong the base station just having been remembered again before this be provided with.Have only when still change is provided with after 7 frames, it is just meaningful to transmit new CQI, because " first " then seems correctly not transmitted.

5. aspect the base station

In base station side, there is such problem, promptly the base station must be determined, whether transmits CQI message in a given frame.Have diverse ways available, it may be still not all roses (power measurement, the analysis of decoder metric after decoding) that meets the natural law for this reason.Only may in certain frame, occur if know additional CQI in advance, the then base station trial of need only in this frame, decoding, this calculating of saving the base station expends.Additionally, I haven't seen you for ages is detected mistakenly for the CQI message level, and in fact do not send CQI message, because the chance of this mistake of rarer generation.

In addition, can alleviate thus that foregoing request of data finishes or " packet call finishes (end of packet call) " problem: have only when last such packet is adding CQI and also is sent out or also allows moment of being sent out to be sent out, just may warn too high quality by such CQI message, when when the other moment sends this packet, mobile radio station can identify, do not follow other packet afterwards, and can identify the situation of " packet call end " thus and do not send CQI message.

Preferably, the base station can not made replying with CQI message yet and is sent so last packet constantly at mobile radio station.

6. the coding that is used for the message CQI of definite channel quality

Conventional CQI message is typically encoded fully with the resolution of 5 bits, that is to say to have 32 kinds of different reports (in fact only use wherein 31 kinds, a kind of coding is used for other purpose).But unconventional CQI message also can be encoded to difference, so it only comprises reference value with respect to the last time, the deviation of last CQI for example.At this, typically do not need the whole dynamic range of 32 values, but value still less is also enough.Therefore owing to must encode to being less than 5 bits, thus also can be for this reason more robust ground form and encode.

At this, more a kind of possibility of the coding of robust is, uses other coding that is different from 5 bits.Another preferred possibility is, at first according to for example 3 bits waiting for transmission calculate 2 bits verification and, the verification of this 2 bit and transmit then with the useful bit of 3 bits.Amount of bits remains on 5 bits consistently thus, and can use identical code decode algorithm.After this when in the base station, receiving, can use this verification and, to improve the fail safe that DTX detects (DTX: discontinuous emission or discontinuous detection).

Verification and can calculating according to known arbitrarily method.Verification and the calculating of optimization can so constitute so that optimize the encoding characteristics of whole coding, this coding by additional verification and calculating and conventional coding produce.For example can be optimised apart from the minimum range of frequency spectrum or whole coding.

Can differently select the reference value of differential coding:

-can be the CQI value that last routine is transmitted.Its advantage is that unconventional CQI message of ignoring can not produce error and increase.

-can be the CQI value of last transmission, that is conventional or unconventional CQI value.Its advantage is that the use currency treats that thus the deviation of differential coding is littler.

-can be the TF value of current transmission.Its advantage is that it is an absolute reference value, error do not occur and increase under the situation of this absolute reference value.So this principle is similar to by powering on/descend the control of electricity order carrying out power.

The improvement of differential coding: when mobile radio station selects maximum or minimum possible CQI value that is first or last in the form to be worth, mobile radio station is not to transmit as the currency of differential coding and the actual difference between the extreme value, but is transmitted in the maximum difference on the extreme value direction.

The base station will be limited to extreme value by the new value that the difference that receives calculates in the one side.Guarantee that thus when the decoding that error is arranged had before been carried out in the base station and also received the CQI value of slight mistake, extreme value was correctly determined in base station self.

Codomain as differential coding for example can be provided with-4dB ,-2dB ,+2dB ,+possibility of 4dB, that is step-length is 2dB.The possibility of 0dB can not need to encode, because do not send additional CQI in this case simply.The step-length that substitutes can be-6dB ,-2dB ,+2dB ,+6dB; Perhaps or even-8dB ,-2dB ,+2dB ,+8dB.Adopt this step-length can send little variation (2dB) with signaling on the one hand, also can send big variation (8dB) with signaling.When being changed to 4dB, must one after the other send two to have respectively+message of 2dB; When being changed to 6dB, can send three to have respectively+message of 2dB, perhaps have-send after the message of 2dB and have+message of 8dB in transmission.Utilize this progressive discretization, can also be adjusted to desired value quickly.Differential coding tackle in as+/-be compared to the large deviation of 8dB as+/-better the little deviation of 2dB.

The discretization of deviation also can depend on tolerance and carry out.When tolerance is big, more rough discretization can be impliedly used thus, and hour meticulousr discretization can be used in tolerance.The discretization of using does not need to send with signaling, but impliedly provides by sending tolerance with signaling.

7. produce the replacement scheme that is used for the definite message CQI of channel quality

Except the generation of the CQI message that proposed, can also use following method and estimate channel characteristics:

When receiving many NACK, this means poor channel, therefore can maybe should mate accordingly coding, so seemingly sent the CQI message that announcement worsens.Similarly, when the NACK that only receives seldom, this means good setting, therefore should select the coding of fewer robusts, perhaps reduced transmitted power.Provide many possibilities, such as can specifically carrying out many NACK or small amount of N ACK.For example can construct level and smooth average or variable, this variable is increase/minimizing specified value under the situation of NACK or ACK, and additionally multiply by the factor (forgetting factor) between 0 and 1.Except multiplying each other, the amplitude of variable also can deduct certain value in each case or have only and just deduct certain amplitude when having sent ACK/NACK.When this variable was lower than or surpass certain value, correspondingly coupling sent quality.This method has following advantage: additional signaling that need be in up link, in most cases realize changing with certain delay certainly.Special case is that quality is mated after fixing a part of ACK/NACK, wherein, and the part that this is fixing or must directly follow in succession, or calculate summation (perhaps as the difference between ACK and the NACK) since the last time coupling

As further improvement, can also determine that mobile radio station sends CQI message respectively after the NACK of some or ACK.Avoid CQI message unnecessary after each NACK whereby.This method also can be combined with the method for introduction in the example 14, that is when above-mentioned variable surpasses or is lower than certain numerical value, just send CQI message.

According to standard, utilize CQI to transmit current channel characteristics.Also can transmit average channel characteristics in the mode that is fit to.But embodiment as described herein can be applied to two kinds of methods equally.When making up with the Phillips method (in order to consider quick decay (fastfading), it or not the current channel quality of transmission, but transmit average channel quality, so that determine slowly decay " log-normal-Fading " better), if for example current average transmission quality just sends additional CQI message with the last difference that sends with signaling.

In addition, also can make up all embodiment, that is to say, when transfer of data is activated, send CQI message more continually, and when just in time not receiving data, then less transmission CQI message.Therefore, when after all not having data etc. pending, avoid sending unnecessary CQI message.

Advantageously, all methods, particularly aforesaid embodiment and a kind of like this method can be combined, in the method, transmission gap after before the new data of transmission by the clear and definite CQI message of base station requests.

8. the measurement on data channel or pilot channel

Not in mobile radio station sends the time of data, mobile radio station can not implemented to measure to data channel.Therefore, mobile radio station is measured the quality on pilot channel under these circumstances in one embodiment, and measures the quality on data channel under the transmission data conditions.

When the quality measured on data channel, there is following operational feasibility: can (by measure signal intensity and noise intensity) directly measure signal to noise ratio (SNR, Signal NoiseRatio) on the one hand.Known data-handling efficiency according to SNR and mobile radio station can calculate CQI thus.Alternatively, also can decode,, can calculate roughly bit error rate thus, send CQI message then in view of the above by the comparison of the bit of bit that receives at first and recompile then again with its coding to the data that received.

9. difference

In other words, relate to a kind of method that is used to regulate at least one data transmission parameters, this data transmission parameters is determined at least one characteristic of data waiting for transmission between mobile radio station and base station,

-wherein, mobile radio station is to base station transmitting channel metrical information,

-wherein, channel quality is determined based on this channel measurement information in the base station,

-wherein, the channel quality that depends on previous established data channel is regulated at least one data transmission parameters, and

-in order to send purpose, notify transmit leg with this determined channel quality by means of channel measurement information about the data of data channel,

Wherein

-measure channel quality under the situation of directly using data channel,

-during greater than predetermined threshold value, measure message in the deviation of the current channel quality of measuring and previous institute channel transmitted quality to the transmit leg transmission channel.

10. the advantage of expansion scheme

The present invention comprises a plurality of elements, these elements individually but especially also improve channel quality reporting (CQI) in combination with one another:

Core point is such thought, promptly when mobile radio station determines that presently used transmission is not the best, that is to say, when present coding/power causes in the good excessively quality of reception of mobile radio station side or caused poor quality, just sends additional CQI.For this reason, opposite with prior art, mobile radio station is not analyzed the quality of reception of pilot channel and is therefrom calculated suitable transformat (power ratio of data channel/pilot channel that supposition is predetermined), but analyze current transmission form and check, whether it is suitable under the data power situation of reality.

If TF (transformat) is inappropriate, that is send with too much power or with very few power, mobile radio station sends CQI so.

By the quality informing base station of CQI feedback with connection.

Basically by this feedback a kind of modulation and encoding scheme (MCS) are proposed, because can calculate encoding rate according to the quantity of coding and the size of transmission block.

Based on this information and other rules, employed transformat (TF) in down link is determined in the base station.TF obviously determines the content of bag more accurately, promptly is accurate to each bit, and accurately determines employed for this reason transfer resource.For this reason, it comprises following information:

The quantity of-employed channel code and identification number,

-modulation type,

The size of-transport module,

-redundant and constellation version (determining accurately which bit transmits on which position of bag),

In addition, to the additional control information of UE transmission, these additional control informations are not first and foremost to be used for determining transformat by the base station, yet are essential for the correct processing of bag:

1. the identification number of hybrid ARQ process (being used for the repeatedly transmission of correct stack bag)

-new data indicator, it helps to distinguish the transmission that repeats of the transmission of new bag and previous bag.

In such CQI that does not have clearly request, do not use absolute coding usually, and be to use the Delta coding, this Delta coding key, too high or too low how much intensity of the power that is received (how many dB).Can send this message with signaling with seldom bit only, for example two table of bits indicating value-3dB, 6dB ,+3dB ,+6dB.(reason: deviation must be positioned on the determined range of tolerable variance on the one hand, but on the other hand again can not be big a lot, because otherwise just sent CQI in the past, so that can not be along with accumulating very large deviation time lapse.) for this reason, can utilize this fact, the bit that soon is not used as verification and, to improve the identification of base station: relate to DTX here and detect to CQI message, the base station must be judged, in fact the signal that whether is received comprises CQI, does not perhaps comprise CQI message at all, that is to say and only receive noise.

In addition, there is such possibility, when ought be effective promptly to the transfer of data of mobile radio station, frequent additional CQI or the conventional CQI of sending, when but ought not have transfer of data just be effective, that is to say when mobile radio station only is ready to directly receive data, only send CQI with low rate.

Claims (38)

1. be used between transmit leg (BS, MS) and recipient (MS, BS), transmitting the method for data, wherein, regulate transmission parameter according to following steps via the radio channel of communication network (CN):

A) described transmit leg transfers data to described recipient, and wherein, described transmission characterizes by at least one transmission parameter, and described transmission parameter is regulated according to first channel quality of the known described radio channel of described transmit leg;

B) described recipient receives described data;

C) described recipient according to determine about the data of at least one employed transmission parameter first channel quality that described transmit leg is known and

D) determine current second channel quality according to data Quality about the data that received;

E) described recipient compares first and second channel qualities.

2. according to the process of claim 1 wherein,

F) if the mutual deviation of first and second channel qualities surpasses predetermined tolerance,

G) so described recipient notifies described transmit leg with deviation, and described subsequently transmit leg redefines first channel quality, regulates described at least one transmission parameter based on this first channel quality.

3. according to the method for claim 1 or 2, wherein, described transmit leg is base station (BS) and described recipient is mobile radio station (MS), and is perhaps opposite.

4. according to the method for one of aforesaid right requirement, wherein, described radio channel is the channel towards grouping, on the channel of grouping data is divided at least one independent packet at this.

5. according to the method for claim 1 to 3, wherein, described radio channel is continuous data channel.

6. according to the method for one of aforesaid right requirement, wherein, step a) comprises following substep:

A1) recipient of described data sends to channel measurement message via the control radio channel of distributing to described radio channel the transmit leg of described data;

A2) described transmit leg is determined first channel quality of described radio channel based on this channel measurement message.

7. according to the method for one of aforesaid right requirement, wherein, receive the data of described at least one data packet form, and step c) comprises following substep alternatively:

Therefore c1) described packet is decoded and determine described at least one transmission parameter, as/or

C1*) send at least one transmission parameter to described recipient with signaling.

8. according to the method for one of aforesaid right requirement, wherein, receive the data of described at least one data packet form, and wherein, step d) comprises following substep:

D1) packet that is received is decoded;

D2) in the useful data content of considering to determine under the situation that probability is judged described packet;

D3) under the situation that existing information about described transmission parameter is applied to test packet, determined useful data content is encoded;

D4) determine the transmission quality of the packet that received based on the deviation between packet and the test packet.

9. the method that one of requires according to aforesaid right wherein, is passed through the noise of the packet that received and is recently determined described second channel quality.

10. according to the method for one of aforesaid right requirement, wherein, form transmission parameter by through-put power, and the tolerance that explanation is scheduled to aspect through-put power in step f.

11. according to the method for one of aforesaid right requirement, wherein, described tolerance illustrates allow which error rate directly or indirectly in packet.

12. according to the method for one of claim 2 to 11, wherein, come performing step g) by resending channel measurement message.

13., wherein, realize determining of first channel quality based on the pilot channel of distributing to described radio data channel according to the method for one of aforesaid right requirement.

14., wherein,, realize determining of second channel quality based on the pilot channel of distributing to described radio data channel for the situation that does not have data to be transmitted according to the method for one of aforesaid right requirement 1 or 3 to 13.

15. the method according to one of aforesaid right requirement wherein, illustrates described tolerance as power level, wherein, using the situation of determined modulation to be issued to definite error rate with determined encoding rate.

16. according to the method for one of aforesaid right requirement, wherein, described tolerance is scheduled to by described transmit leg or by described recipient or by described communication network alternatively.

17., wherein, move at least two communication services and can regulate described tolerance and therefore definite quality of service at each communication service separately via described radio data channel according to the method for one of aforesaid right requirement.

18., wherein, indicate which quality of service is distributed to it at the individual data bag in the packet group according to the method for claim 17.

19. according to the method for claim 16, wherein, described packet group is the packet of packet call.

20. method according to one of claim 17 to 19, wherein, last n packet for packet group, when the deviation of the second channel quality and first channel quality during greater than described tolerance, do not notify the transmit leg of described packet, wherein, n be from 1 in the described packet group integer of quantity of data packets.

21., wherein, described deviation is notified the transmit leg of described data by channel measurement message according to the method for one of claim 2 to 20.

22. the method that one of requires according to aforesaid right, wherein, except other, the conventional channel measurement message that is provided with, send described channel measurement message.

23. according to the method for claim 22, wherein, send additional channel measurement message in time frame, this time frame is tightr than the time frame of the channel measurement message that sends described routine therein.

24. the method that one of requires according to aforesaid right wherein, is used to send time frame and institute's data quantity transmitted conventional or unconventional channel measurement message and is complementary described.

25. the method that one of requires according to aforesaid right wherein, when receiving at least j continuously not about the packet in the predetermined range of tolerable variance of the error rate time, sends additional channel measurement message, wherein j represents the integer greater than 1.

26., wherein, with predetermined resolution the channel measurement message of described routine is encoded fully according to the method for one of aforesaid right requirement, and according to the deviation of reference value described additional channel measurement message being carried out differential coding.

27., wherein, the last first known channel quality is used as reference value according to the method for claim 26.

28. according to the method for claim 26, wherein, as reference value, described first channel quality is based on conventional channel transmitted and measures that message determines with the last first known channel quality.

29. according to the method for claim 26, wherein, described reference value is made up of total transmission characteristic of packet.

30. the method that one of requires according to aforesaid right wherein, is encoded to the channel measurement message of m bit with fixed qty, wherein, (m-x) individual bit carries information, and the verification that forms (m-x) individual bit by x remaining bit with.

31. the method that one of requires according to aforesaid right, wherein, according to described channel measurement message being carried out differential coding with the deviation of the value of the maximum possible of described channel measurement message.

32. according to the method for claim 31, wherein, the step-length of predetermined differential coding.

33. according to the method for claim 32, wherein, the step-length of described differential coding depends on described tolerance.

34. according to the method for one of aforesaid right requirement, wherein, described radio data channel is the part of UMTS network.

35. according to the method for one of aforesaid right requirement 1 to 4 and 6 to 34, wherein, described radio data channel is made of HS-DSCH.

36. have the mobile radio station of processor unit, this mobile radio station so is configured, so that can implement the method according to one of claim 1 to 35.

37. have the base station of processor unit, this base station so is configured, so that can implement the method according to one of claim 1 to 35.

38. comprise according to the mobile radio station of claim 36 with according to the communication network of the base station of claim 37.

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