CN101277167A - Feedback control method, apparatus and transceiver for orthogonal frequency division multiplexing system - Google Patents
Feedback control method, apparatus and transceiver for orthogonal frequency division multiplexing system Download PDFInfo
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- CN101277167A CN101277167A CNA2008100929243A CN200810092924A CN101277167A CN 101277167 A CN101277167 A CN 101277167A CN A2008100929243 A CNA2008100929243 A CN A2008100929243A CN 200810092924 A CN200810092924 A CN 200810092924A CN 101277167 A CN101277167 A CN 101277167A
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Abstract
The invention relates to a mobile communication technique, especially a feedback control method, a device and a transceiver in orthogonal frequency division multiplexing system for solving problem of balancing feedback quantity and system throughput in prior art. The method includes: a receiver terminal determines corresponding channel feedback information of each sub-band respectively in each transmitting time interval; the receiver feeds back each sub-band channel feedback information to a transmitter terminal at interval at least one TTI; the receiver terminal feeds back channel change information of each sub-band relative to previous TTI to the transmitter terminal, or feeds back corresponding channel information or channel change information of frequency band at the same time. The device mainly includes a channel feedback information determination unit and a feedback execution unit, the transceiver mainly includes the device and a resource control unit. The technical solution provided by the invention can balance feedback quantity and system throughput commendably.
Description
Technical field
The present invention relates to mobile communication technology, particularly a kind of feedback, device and transceiver that is used for ofdm system.
Background technology
Adaptive coding and modulating (AMC) technology is meant that receiving terminal feeds back to transmitting terminal with the information of measuring such as channel quality by feedback channel, modes such as chnnel coding that Information Selection such as the channel quality that transmitting terminal provides according to receiving terminal are suitable and modulation, typically as type of coding, code rate, modulation system (QPSK/16QAM etc.), thereby reach the self adaptation of channel and maximize the purpose of transmission rate.Wherein, the control signaling consumption that brings for the information such as channel quality that reduce receiving terminal feedback, general way is typical MCS (the Modulation and Coding Scheme that transmitting terminal is supported, modulation and coded system) make a concordance list and be kept at transmitting terminal and receiving terminal simultaneously, receiving terminal is according to the performance requirement of own receiving terminal, having pre-determined it requires down the needed channel quality of each MCS of reception (typically with SINR (Signal to Interference andNoise Ratio in certain receptivity (as the error rate etc.), signal interference plus noise ratio) characterizes), like this, receiving terminal just can be judged the MCS that it can receive according to the channel quality of actual measurement, and the MCS index of this MCS in described MCS concordance list fed back to transmitting terminal, the MCS index has reflected current channel quality.
Along with development of technology, the improvement of Processing Algorithm, except the MCS index, other feedback of channel information modes of available technology adopting also can obtain the lifting of feedback quantity and systematic function, and for example: MCS, signal interference plus noise are than SINR, channel gain or channel characteristic value.This tittle feeds back after can quantizing with certain bit number equally.For statement for simplicity, below be example with the MCS index.
OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology is actually a kind of of multi-carrier modulation MCM (Multi-Carrier Modulation).Adopt the OFDM technology to send lot of data simultaneously by different subcarriers, so OFDM is a mainstream technology of next generation communication system, also just because sub-carrier number is more, therefore generally can not control the data rate on each subcarrier, way commonly used is the plurality of adjacent subcarrier to be merged become a subband, the unified scheduling of subcarrier that this subband comprised is handled, receiving terminal calculates the average effective SINR of this subband, table look-up then and obtain corresponding M CS index, feed back to transmitting terminal, look into the MCS concordance list is counter by transmitting terminal, can obtain this subband corresponding M CS, that is to say,, can regard the MCS of this subband scheduling as common MCS scheduling when we regard this subband as an integral body.At transmitting terminal, give the MCS of this allocation of subbands correspondence according to MCS index that feeds back and corresponding channel situation.
Method commonly used at present is that all MCS of system's support are made a mapping table, be kept at transmitting terminal and receiving terminal simultaneously, like this at each TTI (Transmission Timing Interval, Transmission Time Interval), receiving terminal calculates the SINR of this subband correspondence according to channel situation and pilot tone
iSINR thresholding according to MCS index correspondence obtains corresponding M CS index then, generally speaking, the SINR value has relation (can certainly go out corresponding scope with corresponding SINR thresholding interval division) one to one with the MCS index, again this MCS index is fed back to transmitting terminal, when MCS was 6 kinds of modes, the subband number was 4 o'clock, fed back the required bit number of each complete MCS index to be:
Here
Refer to be not less than the smallest positive integral of real number X.Therefore the MCS of each subband can be independent, is a kind of many code words (MCW, Multi-Code Word) transmission, can feed back respectively each subband, and then each TTI total bit number that need feed back is: 3 * 4=12.
Be without loss of generality, MCS is a K kind mode when hypothesis, and the subband number is N
g, then feed back a required bit number of complete MCS index and be
Total bit number that each TTI need feed back is:
Obviously, this scheme feedack is the most detailed, but feedback quantity is quite big, and is very big, in fact also unavailable to the throughput of system influence.
Existing another kind of feedback method need calculate the average channel quality information (CQI, Channel Quality Information) on whole frequency band and should average CQI feedback information postback sending end.This scheme has provided following two kinds of feedback systems:
Mode one is only fed back the average CQI of full range band at distributed user;
Mode two is fed back an average CQI of full range band and three best subband CQI at centralized user at every turn;
Wherein, mode one is not considered the problem that the user changes between distributed and centralized two kinds of patterns, get off from the automobile of high-speed mobile such as the user, walking enters a room and sits down, keep link in this process with the base station always, become the video calling of high data volume from the conversation of simple language, this user relates to the conversion of two kinds of resource allocation mode in this course so, and display mode one described feedback system can't be suitable fully.
In the mode two, according to user situation, being in low speed such as the user needs high speed data transfer, so also will feed back the CQI of each subband.As for the size of concrete subband, feedback cycle, and which subband need feed back etc. and all need hold consultation between transmitting terminal and receiving terminal.In the negotiations process, just can take into account factors such as QoS, terminal forms of motion, offered load, frequency selection.
Comparatively speaking; mode two has bigger flexibility than mode one; but in three best (perhaps a plurality of) subband CQI of feedback; the sequence number that needs the feedback subband although the feedback quantity of this mode is littler usually than the CQI of all subbands of feedback, but still has occupied suitable feedback quantity; in case and the sequence number of subband is passed mistake; so corresponding transmission can be in the relatively poor subband transmission of channel situation, and it is invalid to cause transmitting, thereby has influence on the throughput of system.
In sum, because the total bit number that feedback frequency band or subband CQI information are required and the accuracy of feedback information all have influence on the throughput of system, therefore when guaranteeing the feedback information accuracy, need to reduce the required total bit number of feedback, to reach the balance of feedback quantity and throughput as far as possible.
Summary of the invention
The invention provides feedback, device and transceiver in a kind of ofdm system, how to solve in the prior art problem of equilibrium feedback amount and throughput of system.
The present invention's design is achieved through the following technical solutions:
Feedback in a kind of ofdm system comprises the steps:
A, at each Transmission Time Interval TTI, receiving terminal is determined the modulation and the coded system channel feedback information of each subband correspondence respectively;
B, at least one TTI of every interval, receiving terminal feeds back the once channel feedback information of each subband to transmitting terminal, other TTI, receiving terminal feeds back the change information that each subband is gone up the channel feedback information of a TTI relatively to transmitting terminal.Based on same technical conceive, the feedback in the another kind of ofdm system provided by the invention comprises the steps:
A, at each TTI, receiving terminal is determined the channel feedback information of whole frequency band;
B, at least one TTI of every interval, receiving terminal feeds back the once channel feedback information of this frequency band to transmitting terminal, other TTI, receiving terminal feeds back the change information that this frequency band is gone up the channel feedback information of a TTI relatively to transmitting terminal.
Based on same technical conceive, the present invention also provides the feed back control system in a kind of ofdm system, comprising: the channel feedback information determining unit, be used at each Transmission Time Interval TTI, and determine the channel feedback information of each subband correspondence respectively; The feedback performance element, connect described channel feedback information determining unit, be used for the TTI that every interval is set, feed back the channel feedback information of each subband to the data stream transmission end, at other TTI, feed back the channel feedback information change information that each subband is gone up a TTI relatively to the data stream transmission end.
Based on same technical conceive, the present invention provides the transceiver in a kind of ofdm system again, comprise Transmit-Receive Unit that is used to receive and send messages and the detecting unit that is used to detect each subband signal to noise ratio, described receiving terminal also comprises feed back control system, this feed back control system specifically comprises: the channel feedback information determining unit, connect described detecting unit, be used for each Transmission Time Interval TTI, determine the channel feedback information of each subband correspondence according to the signal to noise ratio of data flow correspondence on each subband respectively at receiving data stream; The feedback performance element, be connected between described channel feedback information determining unit and the Transmit-Receive Unit, be used for the TTI that every interval is set, feed back the channel feedback information of each subband to the data stream transmission end by Transmit-Receive Unit, at other TTI, feed back the change information that each subband is gone up the channel feedback information of a TTI relatively by transmitting-receiving unidirectional traffic transmitting terminal.
Based on same technical conceive, feed back control system in the another kind of ofdm system that provides of the present invention, comprise: the channel feedback information determining unit, be used at each Transmission Time Interval TTI, determine the channel feedback information of whole frequency band correspondence respectively; The feedback performance element, connect described channel feedback information determining unit, be used for the TTI that every interval is set, feed back the channel feedback information of described frequency band to the data stream transmission end, at other TTI, feed back the change information that this frequency band is gone up the channel feedback information of a TTI relatively to the data stream transmission end.
Based on same technical conceive, transceiver in the another kind of ofdm system that provides of the present invention, comprise Transmit-Receive Unit that is used to receive and send messages and the detecting unit that is used to detect each subband signal to noise ratio, described receiving terminal also comprises feed back control system, this feed back control system specifically comprises: the channel feedback information determining unit, be used for each Transmission Time Interval TTI, determine the channel feedback information of whole frequency band correspondence at receiving data stream; The feedback performance element, connect described channel feedback information determining unit, be used for the TTI that every interval is set, feed back the channel feedback information of described frequency band to the data stream transmission end, at other TTI, feed back the channel feedback information change information that this frequency band is gone up a TTI relatively to the data stream transmission end.
In sum, the beneficial effect of technical scheme of the present invention is:
Technical scheme of the present invention has made full use of the continuity of channel and the correlation of channel self, adopt among most of TTI single-bit on/give an order the change information of feedback channel feedback information, and the complete channel feedback information of each subband of periodic feedback is used to correct the error of the change information accumulation of feedback channel feedback information, realized between feedback quantity and throughput of system, having realized balance with less feedback quantity feedback effective information;
Technical scheme of the present invention can be got subband thinner, and subband of every increase only need increase a feedback bits in most TTI, and therefore of the present invention have a very strong compatibility;
Use technical scheme of the present invention, transmitting terminal can carry out the scheduling of full range band to receiving terminal according to the feedback information of whole frequency band, thereby realized the user being carried out flexible dispatching to greatest extent, need not consider the switching of user between centralized and distributed transmission mode according to channel situation and system situation;
Because technical scheme of the present invention has adopted the scheduling of full range band, therefore feedback information need not to feed back sub-band serial number according to each sub-band serial number sequence arrangement, has avoided factor band sequence number biography mistake and has had influence on throughput of system.
Description of drawings
Fig. 1 is the principle schematic of feedback of the present invention;
Fig. 2 is the main handling process schematic diagram of the embodiment of the invention one described feedback at receiving terminal;
Fig. 3 is the main handling process schematic diagram of the embodiment of the invention one described feedback at transmitting terminal;
Fig. 4 is the embodiment of the invention two described a kind of realization the method for the invention, is applied to the feedback device primary structure schematic diagram of ofdm system;
Fig. 5 is the embodiment of the invention three described transceiver primary structure schematic diagrames that are applied to embodiment two described devices.
Embodiment
In embodiments of the present invention, easy for various feedback of channel information modes for stating, be that example is described with the MCS index.
The present invention is directed to the defective of existing feedback method, make full use of channel self continuity and correlation, a kind of scheme that the MCS of each subband support is fed back is proposed, as shown in Figure 1, be the principle schematic of feedback of the present invention, set the TTI space-number of feed back full MCS index, this TTI space-number can be set and adjust according to the residing environment of system is concrete, transmitting terminal and receiving terminal are carried out following steps respectively after link establishment then:
Receiving terminal is according to the TTI space-number of setting, the MCS index of all subbands of periodic feedback, other TTI feed back to transmitting terminal with the change information of the MCS index that the way of difference is supported each subband, although differential feedback is accurate inadequately, but channel variation is continuous, error can't produce very mistake, this error can periodically obtain correcting simultaneously, influence to resource control can be ignored, main meaning is that the change minimum of the MCS index of each subband only needs a bit just can represent, can keep the throughput of system; The resource distribution mode concrete according to the user, the simultaneously all right or independent MCS index that feeds back the average SINR correspondence of whole frequency band at each TTI of the method for the invention;
The MCS index that MCS index that the transmitting terminal basis is received or MCS index change information are determined each subband of current TTI is adjusted the subband that receiving terminal uses according to resource situation again, thereby realizes feedback cycle control.
Below with specific embodiment and be described with reference to the accompanying drawings technical scheme of the present invention:
Embodiment one
Be without loss of generality, present embodiment hypothesis sub-carrier number is N, is divided into N
gIndividual subband, the time cycle of feed back full MCS index is N
pIndividual TTI, the feedback of each complete MCS index needs N
fIndividual bit, each TTI feed back the MCS index or the MCS index change information of each subband, and each TTI feeds back the MCS index of whole frequency band simultaneously simultaneously.
Be embodiment the method for the invention, transmitting terminal and receiving terminal need set in advance the mapping table of signal to noise ratio and MCS, also claim mapping table, and at each TTI, the flow chart of receiving terminal generation feedback information comprises the steps: as shown in Figure 2
S101, receiving terminal detect the SINR of the data flow correspondence on each subband and the average SINR of whole frequency band;
S102, determine the MCS index of each subband and whole frequency band correspondence according to corresponding SINR respectively;
S103, obtain the current TTI sequence number, and be 1 sub-reel number assignment;
S104, judge whether current TTI needs to feed back the complete MCS index of each subband, if execution in step S110 then; Otherwise, continue step S105;
Here, and mod (x, y) expression is got x and is removed the remainder that obtains in y, be used for judging that current what should feed back is complete MCS index or feedback differential information only, if feed back full MCS index feeds back at the MCS index with each subband of current TTI, otherwise continue, as mod (j, N
pThe complete MCS index of each subband should be fed back in)=0, explanation, otherwise should feed back the MCS index change information of each subband.
Here, N
pCan specify by top signaling, reflection be the speed situation of channel variation because it is relatively stable amount, so its renewal speed is slow, can specify by top signaling.In the data transmit-receive process, transmitting terminal and receiving terminal can consult to determine or change N
p, such as determining N by calculating Doppler frequency shift and the mode of coherence time
p, concrete grammar is that present technique field personnel know, and repeats no more here.
S105-S107, determine the MCS index change information of each subband according to the MCS index of each a subband current TTI and a last TTI respectively;
When the increase of the MCS of subband correspondence index, then the MCS index change information of this subband correspondence is for increasing; When the reduction of the MCS of subband correspondence index, then the MCS index change information of this subband correspondence is for reducing; When the MCS of subband correspondence index does not change, then the MCS index change information of this subband correspondence is for remaining unchanged;
Minimumly can represent the increase and decrease information of MCS index with " on/a give an order " bit, especially, with a bit just can represent the MCS index on/f gives an order
b, these three kinds of states that comprise increase, reduce and remain unchanged, instantiation is: increase with '+1 ' expression, ' 1 ' expression reduces, and remains unchanged with not launching any information representation;
Here, MCS_index (i, j) the i subband that records at j TTI of the finger receiving end MCS index that should adopt, if only need feedback MCS index difference information, then (i is j) with MCS_index (i MCS_index, j-1) the MCS index change information of comparing and obtaining the i subband is up to N
gAfter the MCS index difference information of individual subband correspondence is all determined to finish, execution in step S108;
S108, arrange the MCS index change information of all subbands, and corresponding bit is set, the corresponding bit of MCS index of whole frequency band is set simultaneously according to sub-band serial number;
S109, all bits that will carry feedback information send to transmitting terminal.
S110, arrange the MCS index of all subbands according to sub-band serial number, and corresponding bit is set, the corresponding bit of MCS index of whole frequency band is set simultaneously, execution in step S109 feeds back then.
Might as well give an example, suppose N
p=10 TTI feed back once complete MCS index again, need N as each MCS index
f=3 bits, available subcarrier number are N=384, are divided into N
g=12 subbands, then each sub-reel number needs N
i=4 bits, so existing feedback system two needs feedback (N in each TTI
f+ N
i) * 3+N
f=24 bits, and technical scheme of the present invention needs [N at each TTI
f* N
g+ N
g* (N
p-1)]/N
p+ N
f=17.4 bits, so the present invention has conspicuous technique effect.
Can get through simple reckoning, in suc scheme, as long as satisfy (N
f+ N
i) * 3+N
f＞[N
f* N
g+ N
g* (N
p-1)]/N
p+ N
f, i.e. N
p＞2, required number of bits of feedback can be less than feedback system two in the technical scheme of the present invention, if channel variation speed is slower, and N so
pValue can obtain quite greatly, superiority of the present invention is just more remarkable.
At each TTI, transmitting terminal is according to feedback information decision MCS index and carry out resource control, when receiving complete MCS index feedback, transmitting terminal gets final product corresponding subband adjustment, at other TTI, can on receiving/give an order and carry out following processing: if last/giving an order is-1, then the MCS index will subtract 1, if last/giving an order is+1, then the MCS index adds 1, otherwise remains unchanged.Obtaining the MCS index of each subband, transmitting terminal sorts the subband that can give this receiving terminal according to resource situation again, gives this receiving terminal the allocation of subbands of maximum MCS index correspondence.So just finished the circulation of a feedback, concrete control flow chart comprises the steps: as shown in Figure 3
S201, transmitting terminal receiving feedback information;
S202, obtain the TTI sequence number of the time of reception;
S203, judge that what comprise in the feedback information that this TTI receives is complete MCS index of each subband or MCS index change information only;
If comprise it being the complete MCS index of each subband in the feedback information, then directly execution in step S207 upgrades the MCS index of each subband and whole frequency band correspondence according to feedback information, otherwise continues.
Here, and mod (x, y) expression is got x and is removed the remainder that obtains in y, and the feedback information that is used for judging current reception is complete MCS index of each subband or MCS index change information only, as mod (j, N
p)=0 illustrates that feedback information is complete MCS index, otherwise feedback information is each subband MCS index change information.
S204-S206, determine that according to the MCS index of each a subband MCS index change information and a last TTI MCS index of each subband current TTI, concrete grammar are respectively, according to each sub-band serial number, on carrying on the corresponding bits position/f gives an order
bFor:
+ 1 o'clock, expression MCS index increased, and the MCS index of a TTI on the corresponding subband is added the MCS index of 1 back as this subband current TTI;
-1 o'clock, expression MCS index reduced, and the MCS index of a TTI on the corresponding subband is subtracted the MCS index of 1 back as this subband current TTI;
When not having signal, expression MCS index remains unchanged, with the MCS index of a TTI on the corresponding subband MCS index as the MCS index of this subband current TTI.
S207, upgrade the MCS index of each subband and whole frequency band correspondence, transmitting terminal sorts the subband that can give this receiving terminal according to resource situation again, gives this receiving terminal the allocation of subbands of maximum MCS index correspondence, has realized the loop control of full range band.
In sum, suppose that sub-carrier number is N, is divided into N
gIndividual subband, the time cycle of feeding back the complete MCS index of each subband is N
pIndividual TTI, the feedback of each complete MCS index needs N
fIndividual bit, then the feedback coefficient of average each TTI is [N
f* N
g+ N
g* (N
p-1)]/N
pIndividual bit; If feed back the MCS index of the average SINR correspondence of whole frequency band simultaneously, then the feedback coefficient of average each TTI is [N
f* N
g+ N
g* (N
p-1)]/N
p+ N
fIf, subband is got thinner, subband of every increase only need increase a feedback bits in most TTI so, this means stronger compatibility.
If the capacity of feedback channel allows, when the more detailed MCS index change of needs information, MCS index change information can represent with two bits, and the corresponding MCS of the comprising index of MCS index change information increases by 1 expression information, MCS and is indexed to reduce and adds 2 expression information, MCS index and reduce by 1 expression information, MCS index and reduce by 2 expression information and MCS index at least and keep information; And the receiving terminal basis receives when the MCS index increases by 1 or 2 expression information that corresponding MCS index with the last TTI of correspondence adds the MCS index of 1 or 2 backs as current TTI at least; Receive when the MCS index reduces by 1 or 2 information that corresponding MCS index with the last TTI of correspondence subtracts the MCS index of 1 or 2 backs as current TTI at least; Receive when the MCS index keeps information, with the MCS index of the last TTI of correspondence MCS index as current TTI.Other are more detailed, and method for expressing more than 3 or 3 can the rest may be inferred.
In the foregoing description, the MCS index determines that according to the SINR detected value of data flow on each subband or the frequency band this only is a kind of main implementation method, does not get rid of other and determines mode, does not influence protection scope of the present invention.
The foregoing description is an example with the MCS index that feeds back each subband and whole frequency band correspondence simultaneously, and the MCS in each TTI feedback whole frequency band correspondence is that example describes technical scheme of the present invention in detail, need to prove, when only needing to feed back the MCS of whole frequency band correspondence, the present invention also comprises following execution mode, is applied to the distributed resource control model:
At each TTI, receiving terminal is determined the MCS index of whole frequency band;
At least one TTI of every interval, receiving terminal feeds back the once MCS index of this frequency band to transmitting terminal, other TTI, receiving terminal feeds back the MCS index change information that this frequency band is gone up a TTI relatively to transmitting terminal.
Detail repeats no more as previously mentioned here.
Therefore the present invention need not to feed back sub-reel number owing to adopted the scheduling of full range band, has avoided factor reel number biography mistake and has influenced throughput of system;
The method of the invention can be carried out flexible dispatching to the user to greatest extent according to channel situation and system situation, has realized the full range band scheduling to receiving terminal, need not consider the switching of user between centralized and distributed transmission mode.
Embodiment two
Realize feedback of the present invention feed back control system a kind of structure as shown in Figure 4, comprising:
The channel feedback information determining unit is used at each Transmission Time Interval TTI, determines the MCS index of each subband correspondence respectively according to the signal to noise ratio of data flow correspondence on each subband;
Concrete definite method of MCS index is described in detail in embodiment one, repeats no more here.
The feedback performance element, connect described channel feedback information determining unit, be used for the TTI that every interval is set, feed back the MCS index of each subband to the data stream transmission end, at other TTI, feed back the MCS index change information that each subband is gone up a TTI relatively to the data stream transmission end.
Concrete feedback method is described in detail in embodiment one, repeats no more here.
Described feed back control system also comprises:
First memory cell, connecting channel feedback information determining unit is used to store the mapping table of signal to noise ratio and MCS index;
Second storing sub-units connects the feedback performance element, is used to store MCS index list, the current TTI sequence number of each subband correspondence and reports the required TTI time cycle of MCS index.
And, described channel feedback information determining unit at each TTI simultaneously according to each subband under the average signal-to-noise ratio of frequency band determine corresponding MCS index; And described feedback performance element feeds back the MCS index of described frequency band correspondence simultaneously to transmitting terminal.
Equally, if only feed back the MCS index or the MCS index change information of whole frequency band, any variation does not take place in the structure of feed back control system, and the only corresponding adjustment wherein concrete function of each functional module execution gets final product, and repeats no more here.
Embodiment three
As shown in Figure 5, transceiver in a kind of ofdm system of Application Example two described feed back control systems, comprise Transmit-Receive Unit that is used to receive and send messages and the detecting unit that is used to detect each subband signal to noise ratio, described receiving terminal also comprises feed back control system, and this feed back control system specifically comprises:
The channel feedback information determining unit connects described detecting unit, is used at each Transmission Time Interval TTI, determines the MCS index of each subband correspondence respectively according to the signal to noise ratio of data flow correspondence on each subband;
The feedback performance element, be connected between described channel feedback information determining unit and the Transmit-Receive Unit, be used for when receiving data stream, the TTI that every interval is set, feed back the MCS index of each subband to the data stream transmission end by Transmit-Receive Unit, at other TTI, feed back the MCS index change information that each subband is gone up a TTI relatively by transmitting-receiving unidirectional traffic transmitting terminal.
Described feed back control system also comprises:
First memory cell, connecting channel feedback information determining unit is used to store the mapping table of signal to noise ratio and MCS index;
Second storing sub-units connects the TTI sequence number and judges subelement, is used to store, MCS index list, the current TTI sequence number of each subband correspondence and report the required TTI space-number of MCS index.
And, described channel feedback information determining unit at each TTI simultaneously according to each subband under the average signal-to-noise ratio of frequency band determine corresponding MCS index; And described feedback performance element feeds back the MCS index of described frequency band correspondence simultaneously to transmitting terminal.
This transceiver also comprises resource control unit, connects transceiver module, and the MCS index or the MCS index change information that are used for each subband of being fed back according to the data flow receiving terminal when data streams are adjusted the subband that receiving terminal uses; And/or carry out resource according to the MCS index of the whole frequency band that receiving terminal fed back and control.
Concrete control method is well known to those skilled in the art, and repeats no more here.And if only carry out resource control according to the MCS index or the MCS index change information of the whole frequency band of feeding back, and any variation does not take place in the structure of transceiver, and the only corresponding adjustment wherein concrete function of each functional module execution gets final product, and repeats no more here.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (40)
1, the feedback in a kind of ofdm system is characterized in that, comprises the steps:
A, at each Transmission Time Interval TTI, receiving terminal is determined the channel feedback information of each subband correspondence respectively;
B, at least one TTI of every interval, receiving terminal feeds back the once channel feedback information of each subband to transmitting terminal, other TTI, receiving terminal feeds back the change information that each subband is gone up the channel feedback information of a TTI relatively to transmitting terminal.
2, the method for claim 1, it is characterized in that, this method further comprises: at each TTI, transmitting terminal upgrades the channel feedback information of each subband correspondence according to the channel feedback information of feedback, perhaps, calculate and upgrade the channel feedback information of each subband correspondence of current TTI according to the channel feedback information of a TTI correspondence on the change information of channel feedback information of feedback and each subband.
3, method as claimed in claim 2 is characterized in that, this method further comprises: the channel feedback information after receiving terminal upgrades according to each subband is adjusted the data rate of each subband and is distributed the subband of use for receiving terminal.
4, the method for claim 1 is characterized in that, also comprises in the described steps A: at each TTI, receiving terminal upgrades the channel feedback information of local each subband correspondence of preserving synchronously.
5, the method for claim 1 is characterized in that:
In the described steps A, receiving terminal is determined the channel feedback information of the affiliated frequency band of each subband simultaneously;
Among the described step B, receiving terminal feeds back to transmitting terminal with the channel feedback information of this frequency band correspondence simultaneously.
6, the method for claim 1 is characterized in that:
In the described steps A, receiving terminal is determined the channel feedback information of the affiliated frequency band of each subband simultaneously;
Among the described step B, receiving terminal feeds back the change information of the channel feedback information of described frequency band.
7, as claim 5 or 6 described methods, it is characterized in that this method further comprises:
At each TTI, transmitting terminal upgrades the channel feedback information of local frequency band correspondence of preserving according to the channel feedback information of the described frequency band of feedback;
Perhaps, calculate and upgrade the channel feedback information of current TTI frequency band correspondence according to the channel feedback information of a TTI correspondence on the change information of channel feedback information of the described frequency band of feedback and this frequency band.
8, method as claimed in claim 7 is characterized in that, also comprises in the described steps A: at each TTI, receiving terminal upgrades the channel feedback information of local described frequency band correspondence of preserving synchronously.
As claim 1,5 or 6 described methods, it is characterized in that 9, described channel feedback information change information is represented with a bit or an above bit.
10, method as claimed in claim 9, it is characterized in that, when described channel feedback information change information was represented with a bit, described channel feedback information change information comprised that channel feedback information increases information, channel feedback information reduces information and channel feedback information keeps information; And
Receiving terminal receives when channel feedback information increases information, and the channel feedback information of the last TTI of correspondence is added the channel feedback information of 1 back as current TTI; Receive when channel feedback information reduces information, the channel feedback information of the last TTI of correspondence is subtracted the channel feedback information of 1 back as current TTI; Receive when channel feedback information keeps information, with the channel feedback information of the last TTI of correspondence channel feedback information as current TTI.
11, method as claimed in claim 9, it is characterized in that, when the change information of described channel feedback information was represented with two bits, the change information of described channel feedback information comprised that expression information, the channel feedback information of channel feedback information increase by 1 increase by 2 expression information at least, expression information, the channel feedback information of channel feedback information minimizing 1 reduces by 2 expression information and channel feedback information maintenance information at least; And
The receiving terminal basis receives when channel feedback information increases by 1 or 2 expression information that corresponding channel feedback information with the last TTI of correspondence adds the channel feedback information of 1 or 2 backs as current TTI at least; Receive when channel feedback information reduces by 1 or 2 information that corresponding channel feedback information with the last TTI of correspondence subtracts the channel feedback information of 1 or 2 backs as current TTI at least; Receive when channel feedback information keeps information, with the channel feedback information of the last TTI of correspondence channel feedback information as current TTI.
12, the method for claim 1 is characterized in that, described method also comprises: the mapping table that sets in advance initial channel feedback information and signal to noise ratio and channel feedback information at transmitting terminal and receiving terminal.
13, the method for claim 1 is characterized in that, transmitting terminal feeds back to the channel feedback information or the channel feedback information change information of each subband of receiving terminal and arranges according to the numeric order of each subband.
As claim 1,5 or 6 described methods, it is characterized in that 14, the channel feedback information described in the steps A is determined according to the detected value of the signal to noise ratio of respective stream of data.
15, as each described method in the claim 1 to 6 and 8,10 to 13, it is characterized in that, described channel feedback information be following any one:
Modulation and coded system MCS modulate and coded system MCS index, and the signal interference plus noise is than SINR, channel gain, channel characteristic value.
16, the feedback in a kind of ofdm system is characterized in that, comprises the steps:
A, at each TTI, receiving terminal is determined the channel feedback information of whole frequency band;
B, at least one TTI of every interval, receiving terminal feeds back the once channel feedback information of this frequency band to transmitting terminal, other TTI, receiving terminal feeds back the change information that this frequency band is gone up the channel feedback information of a TTI relatively to transmitting terminal.
17, method as claimed in claim 16 is characterized in that, this method further comprises:
At each TTI, transmitting terminal upgrades the channel feedback information of local frequency band correspondence of preserving according to the channel feedback information of the described frequency band of feedback;
Perhaps, calculate and upgrade the channel feedback information of current TTI frequency band correspondence according to the channel feedback information of a TTI correspondence on the change information of channel feedback information of the described frequency band of feedback and this frequency band.
18, method as claimed in claim 16 is characterized in that, also comprises in the described steps A: at each TTI, receiving terminal upgrades the channel feedback information of local described frequency band correspondence of preserving synchronously.
19, method as claimed in claim 16 is characterized in that, the change information of described channel feedback information is represented with a bit or an above bit.
20, method as claimed in claim 19, it is characterized in that, when the change information of described channel feedback information was represented with a bit, the change information of described channel feedback information comprised that channel feedback information increases information, channel feedback information reduces information and channel feedback information keeps information; And
Receiving terminal receives when channel feedback information increases information, and the channel feedback information of the last TTI of correspondence is added the channel feedback information of 1 back as current TTI; Receive when channel feedback information reduces information, the channel feedback information of the last TTI of correspondence is subtracted the channel feedback information of 1 back as current TTI; Receive when channel feedback information keeps information, with the channel feedback information of the last TTI of correspondence channel feedback information as current TTI.
21, method as claimed in claim 19, it is characterized in that, when the change information of described channel feedback information was represented with two bits, the change information of described channel feedback information comprised that expression information, the channel feedback information of channel feedback information increase by 1 increase by 2 expression information at least, expression information, the channel feedback information of channel feedback information minimizing 1 reduces by 2 expression information and channel feedback information maintenance information at least; And
The receiving terminal basis receives when channel feedback information increases by 1 or 2 expression information that corresponding channel feedback information with the last TTI of correspondence adds the channel feedback information of 1 or 2 backs as current TTI at least; Receive when channel feedback information reduces by 1 or 2 information that corresponding channel feedback information with the last TTI of correspondence subtracts the channel feedback information of 1 or 2 backs as current TTI at least; Receive when channel feedback information keeps information, with the channel feedback information of the last TTI of correspondence channel feedback information as current TTI.
22, method as claimed in claim 16 is characterized in that, described method also comprises: the mapping table that sets in advance initial channel feedback information and signal to noise ratio and channel feedback information at transmitting terminal and receiving terminal.
23, method as claimed in claim 16 is characterized in that, the channel feedback information described in the step a is determined according to the detected value of the signal to noise ratio of respective stream of data.
24, as each described method of claim 16 to 23, it is characterized in that, described channel feedback information be following any one:
Modulation and coded system MCS modulate and coded system MCS index, and the signal interference plus noise is than SINR, channel gain, channel characteristic value.
25, the feed back control system in a kind of ofdm system is characterized in that, comprising:
The channel feedback information determining unit is used at each Transmission Time Interval TTI, determines the channel feedback information of each subband correspondence respectively;
The feedback performance element, connect described channel feedback information determining unit, be used for the TTI that every interval is set, feed back the channel feedback information of each subband to the data stream transmission end, at other TTI, feed back the change information that each subband is gone up the channel feedback information of a TTI relatively to the data stream transmission end.
26, feed back control system as claimed in claim 25 is characterized in that, described feed back control system also comprises:
First memory cell, connecting channel feedback information determining unit is used to store the mapping table of signal to noise ratio and channel feedback information;
Second storing sub-units connects the feedback performance element, is used to store channel feedback information tabulation, current TTI sequence number and the required TTI time cycle of reporting channel feedback information of each subband correspondence.
27, as claim 25 or 26 described feed back control systems, it is characterized in that, described channel feedback information determining unit at each TTI simultaneously according to each subband under the average signal-to-noise ratio of frequency band determine corresponding channel feedback information; And described feedback performance element feeds back the channel feedback information of described frequency band correspondence simultaneously to transmitting terminal.
28, method as claimed in claim 27 is characterized in that, described channel feedback information be following any one:
Modulation and coded system MCS modulate and coded system MCS index, and the signal interference plus noise is than SINR, channel gain, channel characteristic value.
29, the transceiver in a kind of ofdm system, comprise Transmit-Receive Unit that is used to receive and send messages and the detecting unit that is used to detect each subband signal to noise ratio, it is characterized in that described receiving terminal also comprises feed back control system, this feed back control system specifically comprises:
The channel feedback information determining unit connects described detecting unit, is used for each the Transmission Time Interval TTI at receiving data stream, determines the channel feedback information of each subband correspondence respectively according to the signal to noise ratio of data flow correspondence on each subband;
The feedback performance element, be connected between described channel feedback information determining unit and the Transmit-Receive Unit, be used for the TTI that every interval is set, feed back the channel feedback information of each subband to the data stream transmission end by Transmit-Receive Unit, at other TTI, feed back the change information that each subband is gone up the channel feedback information of a TTI relatively by transmitting-receiving unidirectional traffic transmitting terminal.
30, transceiver as claimed in claim 29 is characterized in that, described feed back control system also comprises:
First memory cell, connecting channel feedback information determining unit is used to store the mapping table of signal to noise ratio and channel feedback information;
Second storing sub-units connects the TTI sequence number and judges subelement, is used to store channel feedback information tabulation, current TTI sequence number and the required TTI space-number of reporting channel feedback information of each subband correspondence.
31, as claim 29 or 30 described transceivers, it is characterized in that, described channel feedback information determining unit at each TTI simultaneously according to each subband under the average signal-to-noise ratio of frequency band determine corresponding channel feedback information; And described feedback performance element feeds back the channel feedback information of described frequency band correspondence simultaneously to transmitting terminal.
32, transceiver as claimed in claim 29, it is characterized in that, this transceiver also comprises resource control unit, connect transceiver module, be used for the channel feedback information of each subband of when data streams, being fed back or the change information of channel feedback information and adjust the subband that receiving terminal uses according to the data flow receiving terminal.
33, as claim 29,30,32 arbitrary described transceivers, it is characterized in that, described channel feedback information be following any one:
Modulation and coded system MCS modulate and coded system MCS index, and the signal interference plus noise is than SINR, channel gain, channel characteristic value.
34, the feed back control system in a kind of ofdm system is characterized in that, comprising:
The channel feedback information determining unit is used at each Transmission Time Interval TTI, determines the channel feedback information of whole frequency band correspondence respectively;
The feedback performance element, connect described channel feedback information determining unit, be used for the TTI that every interval is set, feed back the channel feedback information of described frequency band to the data stream transmission end, at other TTI, feed back the change information that this frequency band is gone up the channel feedback information of a TTI relatively to the data stream transmission end.
35, feed back control system as claimed in claim 34 is characterized in that, described feed back control system also comprises:
First memory cell, connecting channel feedback information determining unit is used to store the mapping table of signal to noise ratio and channel feedback information;
Second storing sub-units connects the feedback performance element, is used to store channel feedback information tabulation, current TTI sequence number and the required TTI time cycle of reporting channel feedback information of this frequency band correspondence.
36, as claim 34 or 35 described feed back control systems, it is characterized in that, described channel feedback information be following any one:
Modulation and coded system MCS modulate and coded system MCS index, and the signal interference plus noise is than SINR, channel gain, channel characteristic value.
37, the transceiver in a kind of ofdm system, comprise Transmit-Receive Unit that is used to receive and send messages and the detecting unit that is used to detect each subband signal to noise ratio, it is characterized in that described receiving terminal also comprises feed back control system, this feed back control system specifically comprises:
The channel feedback information determining unit is used for each the Transmission Time Interval TTI at receiving data stream, determines the channel feedback information of whole frequency band correspondence;
The feedback performance element, connect described channel feedback information determining unit, be used for the TTI that every interval is set, feed back the channel feedback information of described frequency band to the data stream transmission end, at other TTI, feed back the change information that this frequency band is gone up the channel feedback information of a TTI relatively to the data stream transmission end.
38, transceiver as claimed in claim 37 is characterized in that, described feed back control system also comprises:
First memory cell, connecting channel feedback information determining unit is used to store the mapping table of signal to noise ratio and channel feedback information;
Second storing sub-units connects the feedback performance element, is used to store channel feedback information tabulation, current TTI sequence number and the required TTI time cycle of reporting channel feedback information of this frequency band correspondence.
39, transceiver as claimed in claim 38, it is characterized in that, this transceiver also comprises resource control unit, connect transceiver module, be used for the channel feedback information of the frequency band that when data streams, fed back or the change information of channel feedback information and carry out resource control according to the data flow receiving terminal.
40, as the arbitrary described transceiver of claim 37 to 39, it is characterized in that, described channel feedback information be following any one:
Modulation and coded system MCS modulate and coded system MCS index, and the signal interference plus noise is than SINR, channel gain, channel characteristic value.
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| CNA2008100929243A CN101277167A (en) | 2006-03-20 | 2006-03-20 | Feedback control method, apparatus and transceiver for orthogonal frequency division multiplexing system |
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| CNA2008100929243A CN101277167A (en) | 2006-03-20 | 2006-03-20 | Feedback control method, apparatus and transceiver for orthogonal frequency division multiplexing system |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610064988 Division CN101043291A (en) | 2006-03-20 | 2006-03-20 | Feedback control method, apparatus and transceiver in OFDM system |
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| CN101277167A true CN101277167A (en) | 2008-10-01 |
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| WO2012089135A1 (en) * | 2010-12-30 | 2012-07-05 | 华为技术有限公司 | Method and device for feeding back channel signal-to-noise ratio |
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