CN102075862A - Method for sending signal by using communication system - Google Patents
Method for sending signal by using communication system Download PDFInfo
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- CN102075862A CN102075862A CN2009102081182A CN200910208118A CN102075862A CN 102075862 A CN102075862 A CN 102075862A CN 2009102081182 A CN2009102081182 A CN 2009102081182A CN 200910208118 A CN200910208118 A CN 200910208118A CN 102075862 A CN102075862 A CN 102075862A
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Abstract
The invention relates to a method for sending a signal by using a communication system. The method comprises the following steps that: transmitting ends transmit signals on shared wireless resources simultaneously; and receiving ends count the states of the transmitting ends according to the signals received on the wireless resources. By a multicast broadcasting service feedback channel method, the channel state information of a plurality of transmitting ends can be effectively acquired, and false alarm probability and missed detection probability are reduced; and compared with the conventional feedback channel scheme, the method saves wireless channel resources.
Description
Technical field
The present invention relates to multiple carrier wireless transmission system, particularly based on the feedback method of Multimedia Broadcast Multicast Service (MBS).
Background technology
" wireless+broadband " become one of trend of present network development, and various wireless communication systems launch keen competition in the broadband wireless access field.And WiMAX (World Interoperabilityfor Microwave Access Forum, global inserting of microwave interoperability standard) is wherein a kind of BWA that receives much concern.WiMAX has entered scale test even commercial stage in states such as America and Europe, Japan and Korea S.It is big that it has coverage, and the transmission rate height is supported high-speed mobile, spectrum efficiency height, characteristics such as networking speed is fast, construction cost is low.Along with popularizing of examination commercialization and commercial movable, WiMAX will have bright development prospect.
WiMAX is based on IEEE 802.16 series standards.In IEEE 802.16 series standards, 802.16-2004 (be called not only 802.16d) and 802.16-2005 (but also being called 802.16e) are two the most successful standards at present.The particularly issue of 802.16e becomes the milestone in wide-band mobile communication field.IEEE 802.16-2004 supports fixing and nomadic sighting distance (LOS) and non line of sight (NLOS) transmission.Under view distance environment, it can be operated in 10GHz～66GHz frequency band.Under nlos environment, it can be operated in the frequency band less than 11GHz.IEEE 802.16-2005 supports to switch and roaming function, can be applied under the speed of a motor vehicle mobile environment, operates mainly in the frequency band less than 6GHz.
Along with the continuous lifting of transmitting terminal demand, following multimedia service will be applied to portable terminal more and more continually, and (Mobile Station, MS), and the WiMAX system helps carrying out mobile flow medium service very much.Along with carrying out of following mobile flow medium service, on a portable terminal, the flow of multicast service is possibly apparently higher than the flow of unicast service.In order to cater to the demand of future market to streaming media service, IEEE 802.16 series standards provide Multimedia Broadcast Multicast Service (Multicast Broadcast Service, MBS).Broadcasting and multicast service (BCMCS) that MBMS of formulating with 3GPP (MBMS) and 3GPP2 formulate are similar, and it also provides the support to multimedia broadcasting and multicast function.
The WiMAX Access Network carries the MBS business by public wireless connections.Defined two kinds of MBS access waies among the IEEE 802.16e: single BS inserts and many BS insert.For this dual mode, ARQ (autorepeat request) is all inapplicable.It is to be connected in the BS by multicast and broadcast to realize that single base station (BS) is inserted, be that multicast and broadcast carries out work alone in each BS, wireless connections sign (the CID of carrying MBS data, Connection identifier) and be connected corresponding security association (SA, Security Association) parameter with this MS to all in this BS is identical.The MS of each participation receives and handles the data of this CID correspondence by the MAC layer, so the multicast and broadcast of each BS connects and only needs a transmission primaries multicast MAC packet.Under many BS access way, a plurality of BS will form a MBS zone (MBS_Zone), and each BS synchronized transmission multicast broadcast data in the same MBS_Zone with identical CID and SA carrying MBS data, can constitute the effect of grand diversity to the MS that participates in.Portable terminal obtains the information of MBS_Zone from the broadcast message of BS, a BS can belong to a plurality of MBS_Zone simultaneously.Under many BS access way,, can adopt the mode of grand diversity for improving receptivity.This mode required in the identical moment, the BS in same MBS zone adopts identical frequency, symbol, subchannel, data that the modulation system synchronized transmission is identical, this makes portable terminal to receive the MBS data simultaneously from a plurality of BS, has therefore improved the reception reliability and the quality of reception.
Because aforesaid Multimedia Broadcast Multicast Service normally carries out single transmission.This particularly to the transmitting terminal of mobile flow medium decoding failure, can greatly influence its satisfaction for the transmitting terminal of decoding failure.And, there is not feedback information timely in traditional Multimedia Broadcast Multicast Service, do not adopt ARQ, and normally carry out single transmission.Because Multimedia Broadcast Multicast Service is a plurality of portable terminals that send to simultaneously in the coverage, so under the situation of single transmission, in order to satisfy the reception of poor transmitting terminal of channel status, the transmission rate of Multimedia Broadcast Multicast Service is lower usually.Shown in figure one, figure one (a) is the work schematic diagram of unicast service in the conventional cell, because channel status is better, can adopt the adjustment coded system of 16QAM from the near transmitting terminal of cell base station.And,, can only adopt the adjustment coded system lower as transmission rates such as QPSK because channel status is relatively poor from the relative transmitting terminal far away of cell base station.When carrying out the Multimedia Broadcast Multicast Service transmission, shown in figure one (b), the same among the channel status of supposing each transmitting terminal and the figure one (a), then in order to satisfy the reception of all transmitting terminals, the adjustment coded system of QPSK can only be adopted in the base station, causes the transmission rate of entire system lower.
In fact; if do not obtain treating the channel condition information (CSI or CQI) of receiving end/sending end; the channel status situation of poor transmitting terminal is not known in base station (BS); it can suppose channel status usually, and the condition of acceptance of poor transmitting terminal is very poor; signal interference ratio is very low; for example be in cell edge, so with the strongest modulation coding mode and bigger power delivery multicast broadcast service data, the QPSK mode shown in figure one (b).The decline that this not only directly causes system spectral efficiency also will bring a lot of negative effects.For example, can produce interference to adjacent sub-district; Can reduce the broadband of the better transmitting terminal of channel status experiences; Can increase terminal energy consumption to the better transmitting terminal of channel status.Meanwhile, because it has come down to prolong the reception and the decoding time of the better transmitting terminal of channel status, so can consume its terminal energy consumption more.So in order to support multicast and broadcasting service better, the modulation coding state that hope realizes as shown in Figure 2.Promptly transmitting terminal far away receives the multicast and the broadcast data of low modulation exponent number (as QPSK) or low code check from the base station, and simultaneously, nearer transmitting terminal receives the multicast and the broadcast data of high modulation exponent number (as 16QAM) or high code check from the base station.
Fig. 3 is traditional ACK/NACK work schematic diagram.As seen, in multicast and broadcasting service,, all will influence whole multicast and broadcasting service if any one transmitting terminal does not correctly receive data.Correctly do not receive data data2 as transmitting terminal MS3 among the figure, will cause the time-out transmission of new data in multicast and the broadcasting service and the re-transmission of data data2.Such efficient is obviously lower, needs to improve.In fact, increasing along with multicast service, the demand of terminal also can constantly increase, and it may receive two even a plurality of Multimedia Broadcast Multicast Service simultaneously.Yet most of terminals all are battery-powered, and battery electric quantity is limited.Therefore, how effectively reducing the terminal energy consumption is the problem that very merits attention.IEEE 802.16e has proposed park mode at energy consumption problem, and when not having transfer of data between base station and the terminal, terminal can enter resting state, promptly by closing some physical unit (as radio-frequency module) to reduce energy consumption.But only to reduce the terminal energy consumption be incomplete by making terminal enter resting state, because a large amount of energy consumptions occurs in the data transmission procedure.Therefore, at a large amount of Multimedia Broadcast Multicast Service that exist in future, designing better MBS data transmission scheme is very important equally.
Summary of the invention
The purpose of this invention is to provide the method that a kind of communication system sends signal.
According to an aspect of of the present present invention, a kind of communication system sends the method for signal, comprises step:
Transmitting terminal is the while transmission signals on the Radio Resource of sharing;
Receiving terminal is according to the state of the signal statistics transmitting terminal that receives on described Radio Resource.
According to another aspect of the present invention, the information detecting method in a kind of communication system comprises step:
At receiving terminal, the signal that at least one Radio Resource receives is the vector sum that a plurality of transmitting terminals send signal;
Receiving terminal is judged the feature of transmitting terminal according to the vector sum of the signal that receives.
Multimedia Broadcast Multicast Service feedback channel method of the present invention not only can effectively be collected the channel condition information of a plurality of transmitting terminals, reduces false-alarm and false dismissal probability, and saves radio channel resource than traditional feedback channel scheme.
Description of drawings
Fig. 1 is a data service modulation coding state schematic diagram in the conventional cell, wherein, (a) is unicast service modulation coding state schematic diagram in the conventional cell, (b) is multicast/broadcast business modulation coding state schematic diagram in the system sub-district;
Fig. 2 is new multicast/broadcast business modulation coding state schematic diagram;
Fig. 3 is traditional ACK/NACK work schematic diagram;
Fig. 4 is new Multimedia Broadcast Multicast Service transmission state schematic diagram;
Fig. 5 is new sending and receiving end signal schematic representation;
Fig. 6 is that Multimedia Broadcast Multicast Service feedback channel new among the present invention distributes and application schematic diagram one;
Fig. 7 is that Multimedia Broadcast Multicast Service feedback channel new among the present invention distributes and application schematic diagram two;
Fig. 8 is that Multimedia Broadcast Multicast Service feedback channel new among the present invention distributes and application schematic diagram three;
Fig. 9 is that Multimedia Broadcast Multicast Service feedback channel new among the present invention distributes and application schematic diagram four;
Figure 10 is new Multimedia Broadcast Multicast Service feedback channel mapping and distributes schematic diagram;
Figure 11 is the reception figure of new Multimedia Broadcast Multicast Service feedback channel.
Embodiment
In order in multi-carrier mobile communication system, to provide than the more reliable transmission of traditional Multimedia Broadcast Multicast Service, guarantee service quality (the Quality of Service of most transmitting terminals, QoS), and provide the higher availability of frequency spectrum, the present invention proposes a kind of mobile communication system signal sending method.This method has defined in system uplink and/or downlink transfer link, receiving terminal is by the feedback information of a plurality of transmitting terminals of reception Multimedia Broadcast Multicast Service service, obtain the transmitting state information of Multimedia Broadcast Multicast Service in the system, so that adjust accordingly, as order of modulation, whether need to retransmit etc., thus the Adaptive Transmission of realization Multimedia Broadcast Multicast Service, and the spectrum efficiency and the transmitting terminal satisfaction of raising system.Multimedia Broadcast Multicast Service feedback channel scheme designed according to this invention not only can effectively be collected the channel condition information of a plurality of transmitting terminals, reduces false-alarm and false dismissal probability, and saves radio channel resource than traditional feedback channel scheme.
Along with the continuous lifting of transmitting terminal demand, will comprise increasing mobile flow medium service in following mobile communication business.And along with extensively the carrying out of mobile flow medium service, Multimedia Broadcast Multicast Service will occur in a large number, and its professional frequency that takes place also can increase fast.For the Multimedia Broadcast Multicast Service of hot topic, may in a BS scope, there be hundreds and thousands of MBS transmitting terminals simultaneously.In this case, the optimization of Multimedia Broadcast Multicast Service becomes extremely important.Multimedia Broadcast Multicast Service in the past normally carries out single transmission.If the decoding failure just will be lost corresponding information when transmitting terminal receives.According to prior art, if transmitting terminal thinks to receive once more the corresponding information of losing just now, just can only apply in addition again, set up a point-to-point connection, allow the base station send corresponding information separately to this transmitting terminal.Owing to do not retransmit timely, this can greatly influence its experience for the transmitting terminal of decoding failure when receiving the mobile flow medium data.And if transmitting terminal is applied in addition, promptly receive for the first time under the situation of bad even interruption at transmitting terminal, application receives again or watches again, allow the base station send corresponding information once more separately to this transmitting terminal, not only a large amount of Radio Resources can be consumed, and the customer satisfaction of mobile flow medium transmitting terminal can be greatly reduced equally.
In radio communication, channel, subchannel, code channel and subcode road etc. all belongs to Radio Resource, therefore in this article, if special declaration not, the equal available channel of the Radio Resource of being mentioned, subchannel, code channel and subcode road wait and replace.
Because feedback information timely not in traditional Multimedia Broadcast Multicast Service, so system can't provide timely and retransmit, and promptly can't adopt automatic request retransmission (Automatic Repeat Request, method such as ARQ).Because Multimedia Broadcast Multicast Service is a plurality of portable terminals that send to simultaneously in the coverage, if therefore adopt traditional channel feedback method, no matter the i.e. quality of channel status, each transmitting terminal all sends feedback information, and this will take a large amount of uplink resources.And if, will save a large amount of resources only by the relatively poor transmitting terminal transmitting channel state information of channel status.For example, traditional feedback information generally includes correct reception, i.e. ACK and non-correct reception, i.e. NACK.Only send the transmitting terminal transmission information of nack message, will inevitably save a large amount of resources by needs.
Another kind of method of saving resource is that part sends, and can be called again in proportion to send.If there be N transmitting terminal will send its channel condition information, system can set a principle, make that satisfying this transmitting terminal that sends principle is less than N, (M and N are positive integers to suppose M, and M is not more than N), the transmission terminal number that is actual transmitting channel state information is M, and this has just realized partly sending, and has reached the purpose of saving resource.Because system is after the information that receives M transmitting terminal transmission, can from the information that M transmitting terminal sends, derive the relevant information of N transmitting terminal according to the principle of default, so just can access and in fact by N the akin result of transmitting terminal transmission information.Because the transmission terminal number that in fact sends information and busy channel resource is only for M, so can save a large amount of resources.A simple and effective realization of said method is exactly to select in proportion, and promptly each transmitting terminal in N transmitting terminal sends information according to the probability of M/N (M/N is less than 1), makes the transmission terminal number of final transmission information reach M on statistics.Another kind method is to select according to the distinctive code name of transmitting terminal correspondence, for example when code name is binary value, indicate (CID) such as connecting, (n and o are positive integers to have only the n of code name and o position, and unequal) be that the transmitting terminal of " 0 " and " 1 " sends, just realized that so basically 4 select 1.A weakness of part sending method is, because the utilization Statistics, so only when the transmission terminal number is more, could make the result comparatively accurate.
In brief, above-mentioned two kinds of methods are when transmission information, make the number of the number of transmitting terminal less than the transmitting terminal that satisfies original trigger condition.That is to say, at traditional automatic request retransmission (Automatic Repeat Request, ARQ) in the sending method, after transmitting terminal is received a packet, can send ACK or nack message according to whether correctly receiving, triggering, promptly original trigger condition is to receive data and decoding, no matter correctly whether receive, all will send because of satisfying transmission ACK or the so original trigger condition of nack message.Obviously, only send, can make the number of the number of transmitting terminal less than the transmitting terminal that satisfies aforementioned original trigger condition by the transmitting terminal that sends nack message.For the part sending method, the number M of transmitting terminal obviously can be less than the number N of the transmitting terminal that satisfies original trigger condition.
In addition, existing the method for feedback information is provided all is point-to-point, particularly for up link, normally require single transmitting terminal that its channel condition information is provided, receive by the base station, and the base station can know clearly that this is the channel condition information of some transmitting terminals when receiving.Though this feedback method is accurate, and significant disadvantages is also arranged, and promptly takies a large amount of air-link resources.Because distinguish the channel condition information of these transmitting terminals, just need allow these information quadrature as far as possible in up link, avoid colliding as far as possible.So if there be N transmitting terminal to send its channel condition information, system should distribute N mutually orthogonal Radio Resource, that is to say, distributes N mutually orthogonal channel, subchannel, code channel or subcode road for this reason.And these wireless resource allocation, can be a kind of in three kinds of quadrature methods of salary distribution commonly used, promptly frequency division mode, time division way or sign indicating number branch mode also can be the combinations of these three kinds of quadrature methods of salary distribution, add the frequency division mode as time division way, and for example time division way adds the frequency division mode branch mode of raising the price again.In multi-carrier communications systems, time division way is basic allocation unit with the OFDM symbol usually, and the frequency division mode is basic allocation unit with subcarrier usually, and sign indicating number branch mode is basic allocation unit with an orthogonal sequence usually.In order to save resource, improve the availability of frequency spectrum, the present invention proposes a kind of feedback method, promptly by allowing different transmitting terminals overlapped when sending feedback information, having reduced, the mutually orthogonal Radio Resource number that provides is provided in the up link, has also just saved air-link resources.Allow different transmitting terminals overlapped when sending feedback information, that is to say, allow different transmitting terminals to send feedback information in same Radio Resource, the information that the system that may make can't the district office be received is from which transmitting terminal.But, for Multimedia Broadcast Multicast Service, this is not a very important problem.Because this moment, system was a plurality of portable terminals that send at the same time in the coverage, it needn't obtain the channel condition information of some specific senders, and key is to obtain the statistical information of the channel status of these portable terminals that receive Multimedia Broadcast Multicast Service in the coverage, so that determine next step transmission means.On the other hand, in order not make Multimedia Broadcast Multicast Service because will satisfy the very poor transmitting terminal of separate channel state, and making the broadband of most transmitting terminals experience shrink greatly, Multimedia Broadcast Multicast Service should be considered the demand of most transmitting terminals, rather than the demand of indivedual transmitting terminals.In order to satisfy the reception of the very poor indivedual transmitting terminals of channel status, the transmission rate of Multimedia Broadcast Multicast Service is inevitable very low, and this is certain to cause the overall operation efficient of Multimedia Broadcast Multicast Service lower.So, Multimedia Broadcast Multicast Service can be considered the demand of indivedual transmitting terminals when satisfying most transmitting terminal demands, formulate some special mechanism, to satisfy the relatively poor indivedual transmitting terminals of channel status as far as possible, make the overall operation efficient of Multimedia Broadcast Multicast Service remain on high level.Based on the demand of the relatively poor indivedual transmitting terminals of channel status, the special mechanism of formulation can have a variety ofly, and for example, designated time or channel separately send separately when the channel status of these indivedual transmitting terminals takes a turn for the better again.Therefore, the feedback method that the present invention proposes is to collect the demand or the channel condition information of a plurality of transmitting terminals and add up in Multimedia Broadcast Multicast Service, and needn't distinguish each transmitting terminal from the feedback information of receiving.In fact, this belongs to the method for utilizing shared channel to transmit.
Transmitting terminal is overlapped when sending feedback information to help obtaining the channel status statistical information.Since different portable terminal can be in same Radio Resource transmission information, so at receiving terminal, the signal that receives may be the summation of a plurality of portable terminal signal transmitteds, this itself just has the effect of statistics.As shown in Figure 5, in the ideal case,, dot when there not being transmitting terminal to send information at Radio Resource 1 place, receiving terminal information not available herein then, promptly signal strength signal intensity is zero; As 1 transmitting terminal, promptly transmitting terminal 3, send information at Radio Resource 3 places, and the signal strength signal intensity of transmission is 1 unit, represent that with the grid of band oblique line then receiving terminal can be received information herein in the drawings, and signal strength signal intensity are 1 unit; In like manner, send information at Radio Resource 2 places as 2 transmitting terminals, the signal strength signal intensity that each transmitting terminal sends is 1 unit, and then receiving terminal can be received information herein, and signal strength signal intensity is about 2 units, and promptly signal strength signal intensity is about 2 times of the signal strength signal intensity received at Radio Resource 3 places; Send information at Radio Resource 4 places as 3 transmitting terminals, the signal strength signal intensity that each transmitting terminal sends is 1 unit, then receiving terminal can be received information herein, and signal strength signal intensity is about 3 units, and promptly signal strength signal intensity is about 3 times of the signal strength signal intensity received at Radio Resource 3 places; The rest may be inferred, and when N transmitting terminal sent information at certain Radio Resource place simultaneously, receiving terminal can be received information herein, and signal strength signal intensity is about N unit.Consider the saving resource, a Radio Resource among Fig. 5 can be understood as a very little message transmission unit in the wireless transmission link usually, or even a minimum message transmission unit, for example, and a subchannel or a sub-code channel.In addition, Fig. 5 is a schematic diagram, consideration be ideal situation, be not introduced in the signal fadeout in the actual wireless transmitting system, but these common engineers and technicians that can not influence this area understand the present invention.In fact, each transmitting terminal need be adjusted transmitting power separately, and the signal strength signal intensity of the feasible signal of oneself launching when arriving receiving terminal after overdamping equates as far as possible that with other transmitting terminals promptly intensity is 1 unit.
Under ideal conditions, we wish that when N transmitting terminal sent information at certain Radio Resource place simultaneously, the signal strength signal intensity that receiving terminal is received was about N unit, the i.e. algebraical sum of each signal strength signal intensity.But the signal strength signal intensity that receiving terminal is received can not be the algebraical sum of the intensity of signal when arriving receiving terminal of each transmitting terminal transmission usually.In real system, because the decline of wireless channel, we not only will consider signal strength signal intensity, also will consider the vectorial angle of signal, that is to say, wireless signal should be counted as a plural number, i.e. a bivector.So, in a Radio Resource, the vector sum the when signal of receiving should arrive receiving terminal corresponding to each transmitting terminal signal.As shown in Figure 4, suppose portable terminal TA1 and TC1 transmission information in same Radio Resource, because the reason of decline, its signal is when arriving receiving terminal, variation has all taken place in amplitude and angle, and respectively as signal A1 and C1 among the figure, the then actual signal of receiving is R1, as can be seen, R1 is the vector sum of vectorial A1 and C1.Clearly, knowledge based on the vector summation, we can know that the amplitude of vectorial R1 will be less than or equal to the amplitude sum of vectorial A1 and vectorial C1, the algebraical sum of the intensity when the promptly actual signal strength signal intensity of receiving will be less than or equal to signal that these two transmitting terminals send and arrive receiving terminal.In addition, when the feedback information of different transmitting terminals when receiving terminal is applied, situation about weakening mutually may appear.For example, in Fig. 4, signal A1 is identical with the amplitude of signal A2, and angle is opposite, so its vector sum is zero, is equivalent to not receive feedback signal at receiving terminal.Also have another kind of situation, promptly vectorial C1 and C2 do not cancel out each other, but three vectorial C1, the vector sum of C2 and C3 approaches zero, has the phenomenon of cancelling out each other between promptly a plurality of vectors.Obviously, this cancelling out each other brings very big negative effect can for the detection of feedback signal.For example, when hope when detecting the transmitting terminal number that sends signal in the Radio Resource simultaneously, M vector of cancelling out each other will mean M transmitting terminal of few calculating, be detected because just be difficult to after cancelling out each other.
For fear of the generation of above-mentioned detection mistake, the present invention proposes a kind of brand-new feedback method.In order effectively to collect the channel condition information of a plurality of transmitting terminals,, can dispose one or more feedback channels for each Multimedia Broadcast Multicast Service.Wherein, each feedback channel is made of several feedback subchannels.Between these feedback subchannels mutual crossover can be arranged, but any two feedback subchannels can be not overlapping fully.Can cut down the phenomenon that the transmitting terminal signal is cancelled out each other greatly like this.From the angle of Radio Resource, feedback channel is made of the individual Radio Resource of I (I is a positive integer), and feedback subchannel is made of the individual Radio Resource of J (J is a positive integer, and J is less than I).J is variable a feedback channel inside, and for example, the feedback subchannel that has is made of the individual Radio Resource of J ' (J '=2), and in same feedback channel, the feedback subchannel that has may be by J '+2, J '+1, and J '-1, or J '-2 Radio Resource constitutes.For some specific senders, when sending feedback information, select a feedback subchannel in the feedback channel earlier, send feedback information at pairing all the Radio Resource places of this feedback subchannel thereafter.The feedback information that transmitting terminal sends in each Radio Resource place can be identical, also can be different, and this can not influence enforcement of the present invention.For example, certain transmitting terminal can send information "+1 " at each Radio Resource place of a feedback subchannel, also can send information "+1-j " at a Radio Resource place, sends information " 1+j " at another Radio Resource place.Obviously as previously mentioned, may not need to discern its information that sends be "+1 " or " 1 " in system.
Message transmission unit when the Radio Resource of feedback channel can be regarded as feedback transmission among the formation the present invention who mentions in front, or even minimal information unit of transfer.Its embodiment has a variety of, and Figure 10 is a kind of execution mode wherein.Usually, the message transmission unit of multi-carrier communications systems becomes to several time frequency unit lattices by one.The size of each time frequency unit lattice is the same, and it takies a physical sub-carrier usually on time domain, and takies an OFDM symbol on frequency domain.About code channel and subcode road, people are the most familiar is quadrature code channel in the code division multiple access system,, says simply that its each quadrature walsh sign indicating number sequence is with quadrature code channel of correspondence as the code channel in the American I S-95 standard criterion.In fact, also can realize similar code channel notion in the multi-carrier communications systems, it can be finished by one group of quadrature walsh sign indicating number sequence of transmission in several time frequency unit lattice.For example in Figure 10, each lattice is represented time frequency unit lattice, and transverse axis is represented the time, vertical axis represents sub-carriers, 6 OFDM symbols and 18 subcarriers of comprising promptly shown in Figure 10.So, if length of transmission is 4 quadrature walsh sign indicating number sequence in being labeled as 4 time frequency unit lattice of " 1 ", then this yard sequence is with quadrature code channel of correspondence.Because in orthogonal intersection space, length is that 4 quadrature walsh sign indicating number sequence has 4, so this group quadrature walsh sign indicating number sequence has 4 orthogonal sequences at most, promptly can set up 4 quadrature code channels in being labeled as 4 time frequency unit lattice of " 1 ".Therefore, in multi-carrier communications systems, minimal information unit of transfer can be time frequency unit lattice usually, or based on a code channel or a sub-code channel of several time frequency unit lattice.In wireless propagation environment, because change and frequency domain decline etc. when existing, for the information that same transmitting terminal sends, the channel variation between the obvious meeting of the channel variation between the time frequency unit lattice more close on time domain and the frequency domain time frequency unit lattice far away less than relative distance.But, because the present invention focuses on the information of obtaining transmitting terminal by statistical property, so the distance between the time frequency unit lattice can not brought considerable influence to enforcement of the present invention.That is to say, constitute several Radio Resources that feedback gives channel between the time frequency unit lattice apart from aspect without limits.In addition, the present invention in force, resource mapping and distribute 6 OFDM symbols and 18 subcarriers be not limited among Figure 10, and can be an OFDM symbol and subcarrier arbitrarily.
By the following examples as can be seen, feedback channel of the present invention and feedback subchannel allocation plan can reduce the probability of omission.Compare with traditional feedback method, Multimedia Broadcast Multicast Service feedback channel distribution method new among the present invention can be eliminated the influence that signal is cancelled out each other between each transmitting terminal greatly, makes that the statistical property of signal is more accurate.As shown in figure 11, as can be seen, the reception of new Multimedia Broadcast Multicast Service feedback channel has littler variance.So this invention is more stable and accurate to the estimation meeting of statistical property, and it is many more to send terminal number, the advantage of this method is obvious more.
The common engineers and technicians of this area should be readily appreciated that the present invention can be applied to the up channel in the communication system, also can be applied to down channel.Can be applied to any multiple sending end shared channel resources and carry out the scene of message transmission, and be not limited to multi-carrier communications systems according to same principle or thinking, also be not limited to wireless communication system.Its application scenarios is not limited to resend data conditions, can expand to a plurality of transmitting terminals and carry out message transmission on shared channel resources, can be applied to the state of system statistics transmitting terminal, for example, supports or negative ratio.By utilizing the present invention, the number of transmitting terminal that satisfies trigger condition is as denominator, and the number that receiving terminal is judged the transmitting terminal that draws according to the vector sum of the signal that receives can obtain the support or the negative ratio of transmitting terminal as molecule.In addition, constitute the number of the channel resource of feedback channel among the present invention, promptly I value and J value are not limited to the numeral in the following examples, can be any positive integer.In fact, the present invention is primarily aimed at following application scenarios, and promptly the transmitting terminal shared channel resources sends, and when receiving terminal detects, concern be statistical property, as transmitting terminal number etc., and do not need to learn each transmitting terminal information transmitted.
Form among Fig. 6,7,8 and 9 has adopted same coordinate form of presentation, has explained new Multimedia Broadcast Multicast Service feedback channel and has distributed and applicable cases.The different transmitting terminal of numeral in the form.
As shown in Figure 6, transverse axis is represented different Radio Resources, and the longitudinal axis has reflected the situation that the feedback information of transmitting terminal is applied at receiving terminal, and the different digital among the figure is represented different transmitting terminals.As can be seen from Figure 6, this feedback channel is made up of the individual Radio Resource of I (I=4), and feedback subchannel wherein has 6, and each is made up of the individual Radio Resource of J (J=2).These 6 feedback subchannels are made of Radio Resource 1 and 2,1 and 3,2 and 3,2 and 4,4 and 3,4 and 1 respectively.For example, transmitting terminal " 1 " has taken a feedback subchannel, and this feedback subchannel is made of Radio Resource 1 and 2, and the feedback subchannel that transmitting terminal " 10 " takies is made of Radio Resource 4 and 1.If transmitting terminal 1 and transmitting terminal 10 have taken place to cancel out each other at Radio Resource 1 place, because their transmitting feedback informations in different feedback subchannels, so can be detected at Radio Resource 2 and Radio Resource 4 places respectively.And for example, transmitting terminal 1,8 and 10 has taken place to cancel out each other at Radio Resource 1 place, similarly, because their transmitting feedback informations in different feedback subchannels, so can be detected at Radio Resource 2,3 and 4 places respectively.So,, can reduce the probability of omission by feedback channel of the present invention and feedback subchannel allocation plan.
As shown in Figure 7, this feedback channel is made up of the individual Radio Resource of I (I=5), and J equals 2 or 3.Feedback subchannel has 12, wherein is made up of 2 Radio Resources for 6, and these 6 feedback subchannels are made of Radio Resource 1 and 2,1 and 3,2 and 3,2 and 4,4 and 3,4 and 1 respectively.Be made up of 3 Radio Resources for other 6, these 6 feedback subchannels are made of Radio Resource 1,5 and 2,1,5 and 3,2,5 and 3,2,5 and 4,4,5 and 3,4,5 and 1 respectively.For example, the feedback subchannel that transmitting terminal " 1 " takies is made of Radio Resource 1,5 and 2, and the feedback subchannel that transmitting terminal " 8 " takies is made of Radio Resource 1 and 3.
As shown in Figure 8.This feedback channel is made up of the individual Radio Resource of I (I=3), and feedback subchannel wherein has 3, and each is made up of the individual Radio Resource of J (J=2).These 3 feedback subchannels are made of Radio Resource 1 and 2,1 and 3 and 2 and 3 respectively.
As shown in Figure 9, this feedback channel is made up of the individual Radio Resource of I (I=5), and J equals 2 or 3.Feedback subchannel has 12, wherein is made up of 2 Radio Resources for 6, and these 6 feedback subchannels are made of Radio Resource 1 and 2,1 and 3,2 and 3,2 and 4,4 and 3,4 and 1 respectively.Be made up of 3 Radio Resources for other 6, these 6 feedback subchannels are made of Radio Resource 1,5 and 2,1,5 and 3,2,5 and 3,2,5 and 4,4,5 and 3,4,5 and 1 respectively.In should using, the feedback subchannel that transmitting terminal " 1 " takies is made of Radio Resource 1 and 2, and the feedback subchannel that transmitting terminal " 2 " takies is made of Radio Resource 1,3 and 5.
Figure 10 has explained a kind of performance of the mapping and the distribution of new Multimedia Broadcast Multicast Service feedback channel for example.As shown in figure 10, each lattice is represented time frequency unit lattice, and transverse axis is represented the time, and vertical axis represents sub-carriers is so comprise 6 OFDM symbols and 18 subcarriers among Figure 10.As previously mentioned, we can set up 4 quadrature code channels in being labeled as 4 time frequency unit lattice of " 1 ", be called W11 respectively, W12, W13 and W14.Next, can in being labeled as 4 time frequency unit lattice of " 2 ", set up 4 quadrature code channels, be called W21 respectively, W22, W23 and W24.The rest may be inferred, just can set up 4 quadrature code channels in 4 time frequency unit lattice that are labeled as " m " (m is a positive integer), is called Wm1 respectively, Wm2, and Wm3 and Wm4 (also can be expressed as W
M, 4).As previously mentioned, though several Radio Resources that constitute feedback subchannel between the time frequency unit lattice apart from aspect without limits, in actual applications, still recommend the nearer Radio Resource of service range.So, when needs constitute a feedback channel by 4 Radio Resources, recommend to select mutual spacing from very near Radio Resource, as W
1,1, W
1,2, W
1,3And W
1,4, can certainly select mutual spacing from Radio Resource far away, as W
11,1, W
12,2, W
13,1And W
14,4In like manner, when needs constitute a feedback channel by 5 Radio Resources, recommend to select mutual spacing from very near Radio Resource, as W
12,1, W
12,2, W
12,3, W
12,4And W
13,3, can certainly select mutual spacing from Radio Resource far away, as W
21,1, W
31,2, W
13,3, W
24,3And W
41,4, W and for example
31,1, W
32,2, W
33,3, W
34,3And W
35,4
With reference to Figure 10, constitute a feedback channel by four Radio Resources.Radio Resource 1,2,3 and 4 correspond respectively among Figure 10 4 time frequency unit lattice that are labeled as " m " (m is a positive integer), as are labeled as 4 time frequency unit lattice of " 1 ".Among this embodiment, do not set up the quadrature code channel therein.
With reference to Figure 10 and embodiment 6, constitute a feedback channel by 20 Radio Resources.Radio Resource 1,2,3 and 4 correspond respectively among Figure 10 4 time frequency unit lattice that are labeled as " 1 ", Radio Resource 5 to 8 corresponds respectively among Figure 10 4 time frequency unit lattice that are labeled as " 2 ", Radio Resource 9 to 12 corresponds respectively among Figure 10 4 time frequency unit lattice that are labeled as " 3 ", Radio Resource 13 to 16 corresponds respectively among Figure 10 4 time frequency unit lattice that are labeled as " 4 ", and Radio Resource 17 to 18 corresponds respectively among Figure 10 4 time frequency unit lattice that are labeled as " 5 ".Among this embodiment, do not set up the quadrature code channel therein.
With reference to Figure 10 and embodiment 5, by three Radio Resource W
13,4, W
22,2And W
42,1Constitute a feedback channel.Feedback subchannel wherein has 3, respectively by Radio Resource W
13,4And W
22,2, W
13,4And W
42,1, W
22,2And W
42,1Constitute.Can see that the distance of these three Radio Resources on time-frequency domain is far away, this can be applied to the present invention equally.
Claims (14)
1. a communication system sends the method for signal, comprises step:
Transmitting terminal is the while transmission signals on the Radio Resource of sharing;
Receiving terminal is according to the state of the signal statistics transmitting terminal that receives on described Radio Resource.
2. method according to claim 1 is characterized in that described transmitting terminal only comprises the transmitting terminal of non-correct reception.
3. by the described method of claim 1, it is characterized in that between a plurality of subchannels that described Radio Resource constitutes crossover mutually.
4. by the described method of claim 3, the number that it is characterized in that constituting the Radio Resource of different subchannels is different.
5. by the described method of claim 1, it is characterized in that at the number of the transmitting terminal of the channel information of sharing number less than the transmitting terminal that satisfies original trigger condition.
6. by the described method of claim 3, it is characterized in that transmitting terminal information transmitted on each Radio Resource of subchannel is identical.
7. method according to claim 1 is characterized in that described transmitting terminal state comprises support or negative ratio.
8. method according to claim 1 is characterized in that the distance on time-frequency domain keeps minimum as far as possible between described Radio Resource.
9. the information detecting method in the communication system comprises step:
At receiving terminal, the signal that at least one Radio Resource receives is the vector sum that a plurality of transmitting terminals send signal;
Receiving terminal is judged the feature of transmitting terminal according to the vector sum of the signal that receives.
10. method according to claim 9 is characterized in that the feedback channel that described Radio Resource constitutes comprises a plurality of feedback subchannels.
11. method according to claim 10 is characterized in that mutual crossover between described feedback subchannel.
12. method according to claim 10 is characterized in that any two feedback subchannels are not exclusively overlapping.
13. by the described method of claim 9, the feature that it is characterized in that transmitting terminal comprises the number of transmitting terminal.
14. method according to claim 9, the number of transmitting terminal that it is characterized in that sending signal is less than the number of the transmitting terminal that satisfies original trigger condition.
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| CN106559303A (en) * | 2015-09-28 | 2017-04-05 | 瞻博网络公司 | Using multicast address as the tunnel remote gateway address in layer 2 tunneling protocol LAC |
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| CN1891003A (en) * | 2003-10-08 | 2007-01-03 | 高通股份有限公司 | Method and apparatus for feedback reporting in a wireless communications system |
| CN101056457A (en) * | 2006-06-29 | 2007-10-17 | 华为技术有限公司 | Signal detection method of the channel in the E-DCH |
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