CN101040461A - A method of transmitting feedback information in an orthogononal frequency division multiplexing (OFDM)/ofdm access (OFDMA) mobile communication system - Google Patents
A method of transmitting feedback information in an orthogononal frequency division multiplexing (OFDM)/ofdm access (OFDMA) mobile communication system Download PDFInfo
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- CN101040461A CN101040461A CNA2005800352584A CN200580035258A CN101040461A CN 101040461 A CN101040461 A CN 101040461A CN A2005800352584 A CNA2005800352584 A CN A2005800352584A CN 200580035258 A CN200580035258 A CN 200580035258A CN 101040461 A CN101040461 A CN 101040461A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2646—Arrangements specific to the transmitter only using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
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Abstract
A method of transmitting feedback information in a wireless communication system is disclosed. More specifically, the method comprises a mobile station (MS) which determines whether to transmit feedback information to a base station (BS) without solicitation from the BS. After determining to do so, the MS transmits a request message to request the BS to allocate an uplink resource for transmitting at least one unsolicited header and thereafter receives the uplink resource allocation from the BS. Lastly, the MS transmits the at least one unsolicited header via the allocated uplink resource.
Description
Technical field
The present invention relates to a kind of method that sends feedback information, and more particularly, the present invention relates to a kind of method that in OFDM (OFDM)/OFDM (OFDM) mobile communication system, sends feedback information.
Background technology
In multiple-input and multiple-output (MIMO) wireless communication system that adopts OFDM (OFDM) method, feedback information is sent to base station (BS) from mobile radio station (MS).The OFDM method utilizes a plurality of subcarriers to improve frequency efficiency.At this, each subcarrier keeps orthogonality relation mutually.
At work, BS distributes fast feedback channel, to obtain downlink channel status information, and utilize this fast feedback channel, BS transmitting channel quality information channel (CQICH) information word (IE) also can be provided with different CQICH_enchanced_allocation IE (CQICH_ enhancing _ distribution IE).Meanwhile, this BS utilizes subcarrier (perhaps fastfeedback_allocation subheader (feedback _ distribution sub-header fast)) to distribute this CQI channel.
In mimo system, send this feedback information by CQICH or the fast feedback channel that distributes.This feedback information comprises mimo channel matrix H and weighted value and the information of the displacement patterns that the MIMO pattern selected about MS or MS select.At this, for example, the MIMO pattern comprises: space-time emission diversity (STTD) pattern, spatial reuse (SM) pattern and closed loop SM pattern.In addition, displacement patterns comprises: use subcarrier (FUSC) entirely, it utilizes all subcarriers in this frequency band to realize diversity; Part is used subcarrier (PUSC), and it utilizes the subcarrier of ormal weight to realize diversity; And Adaptive Modulation and Coding (AMC), it uses the subcarrier adjacent each other of ormal weight.
According to prior art, the feedback information based on the instruction that provides from BS is provided MS.Yet even MS requires this feedback information is sent to BS, this BS also must wait for, sends instruction to do like this up to this BS.Like this, the efficient of this transmitting channel is low, in other words, can not effectively utilize this transmitting channel.
Summary of the invention
Therefore, the present invention relates to a kind of method that sends feedback information in the OFDM/OFDMA mobile communication system, it has overcome basically because one or more problem that the limitation of prior art and defective exist.
The purpose of this invention is to provide a kind of method that sends feedback information in wireless communication system, wherein base station (BS) is to mobile radio station (MS) allocated channel quality indicator channel (CQICH).
Another object of the present invention provides a kind of method that sends feedback information in wireless communication system, and wherein base station (BS) be not to mobile radio station (MS) allocated channel quality indicator channel (CQICH).
Another purpose of the present invention provide a kind of in wireless communication system the method for receiving feedback information, wherein base station (BS) distributes mobile radio station (MS) or allocated channel quality indicator channel (CQICH) not.
To describe other advantages of the present invention, purpose and feature to a certain extent in the following description, and to a certain extent, by studying following content, other advantages of the present invention, purpose and feature are conspicuous for the those of ordinary skill in the present technique field, by implementing the present invention, also can learn other advantages of the present invention, purpose and feature.The structure of utilizing written explanation of the present invention and claim thereof and accompanying drawing to particularly point out can realize and reach purpose of the present invention and other advantages.
In order to realize these purposes of the present invention and other advantages, and according to the present invention purposes, as this realization with broadly described, a kind of method that sends feedback information comprises: do not having under the situation of asking for instructions from BS, mobile radio station (MS) determines whether feedback information is sent to base station (BS).After determining to do like this, this MS sends a request message, and divides with request BS to be used in the uplink resource that is sent to a few header of not asking for instructions, and then, receives the uplink resource that distributes from this BS.At last, this MS sends this at least one header of not asking for instructions by the uplink resource that distributes.
According to another aspect of the present invention, a kind of method of receiving feedback information comprises: in order to distribute uplink resource, base station (BS) receives request message from mobile radio station (MS), wherein sends this request message under the situation that base station (BS) do not ask for instructions.In addition, this BS is identified for this MS branch is used in the uplink resource that header is not asked in transmission at least for instructions, then, the uplink resource allocation of determining is sent to this MS.At last, this BS receives at least by the uplink resource that distributes and does not ask header for instructions.
According to another aspect of the present invention, a kind of method that is used to send feedback information comprises: under the situation of asking for instructions from this BS not, mobile radio station (MS) is determined feedback information is sent to base station (BS), according to determining to send Warning Mark, distributes uplink resource with request then.After this, this MS is from the resource allocation of BS receiving uplink, then, in response, send at least one by the uplink resource that distributes and do not ask header for instructions, wherein this at least one do not ask header for instructions and comprise feedback information.
In another embodiment of the present invention, a kind of method that is used for receiving feedback information comprises: base station (BS) receives the Warning Mark that is used to distribute uplink resource from MS, wherein do not sending Warning Mark under the situation of asking for instructions from this BS.In addition, this BS determines this MS is distributed uplink resource, does not ask header for instructions so that send at least one, then, the uplink resource allocation of determining is sent to this MS.At last, this BS utilizes the uplink resource that distributes to receive at least one header, does not wherein ask header for instructions and comprises this feedback information.
In addition, in another embodiment of the present invention, a kind of method that is used to send feedback information comprises: under the situation of asking for instructions from this BS not, mobile radio station (MS) is at first determined feedback information is sent to base station (BS), then, determine whether this BS has distributed channel quality indicating channel (CQICH).In addition, if this BS has distributed CQICH, then this MS sends Warning Mark, is sent to few uplink resource of not asking header for instructions to ask this BS branch to be used in.After this, this MS is from the resource allocation of BS receiving uplink, and then, at least one does not ask header for instructions to utilize the uplink resource that distributes to send this.
In another embodiment of the present invention, a kind of method that sends feedback information comprises: do not having under the situation of asking for instructions from this BS, mobile radio station (MS) is at first determined feedback information is sent to base station (BS), and determines then whether this BS has distributed channel quality indicating channel (CQICH).After this, this MS sends a request message, and divides to be used in request BS to be sent to few uplink resource of not asking header for instructions.At last, this MS is from the resource allocation of BS receiving uplink, and then, at least one does not ask header for instructions to send this by the uplink resource that distributes.
In addition, in another embodiment of the present invention, a kind of method that sends feedback information comprises: this mobile radio station (MS) utilizes uplink resource that data are sent to base station (BS).After this, under the situation of asking for instructions from this BS not, this MS determines feedback information is sent to this BS, then, sends at least one by the uplink resource that is used to send these data and does not ask header for instructions.
Obviously, above to general remark that the present invention did and following to the detailed description that the present invention did be typicalness with illustrative, and they are intended to further explain desired the present invention.
Description of drawings
Included accompanying drawing helps further to understand the present invention, and their introduce the application's book, constitute the part of the application's book, and they illustrate (respectively) of the present invention embodiment, and with illustrate that one is used from the explanation principle of the invention.In the accompanying drawing:
Fig. 1 illustrates the example of the Frame that distributes according to fast feedback channel;
Fig. 2 illustrates the example of CQI feedback header;
Fig. 3 is when being illustrated in this MS distribution fast feedback channel or CQICH, receives to be used for the example of operation that aperiodicity sends the uplink radio resource assignment of snap information;
Fig. 4 is illustrated in when not distributing CQICH, receives the example of operation of the uplink resource allocation be used to send snap information;
Fig. 5 illustrates the work of modulator/demodulator;
Fig. 6 illustrates the structure of model selection feedback header, sends this model selection feedback header itself, and companion data part not;
Fig. 7 is the example that operation of the present invention is shown;
Fig. 8 illustrates the example of model selection feedback header;
Fig. 9 illustrates the example of the data structure of Medium Access Control (MAC) Protocol Data Unit (PDU);
Figure 10 is the example that the structure composition of mac header is shown;
Figure 11 is the example that the Frame on the physical layer is shown;
Figure 12 is the example that the feedback operation of " feedback kind " is shown; And
Figure 13 is the example that the composition of feedback mac header is shown.
Embodiment
Now, will describe the preferred embodiment of the present invention in detail, accompanying drawing illustrates its example.In institute's drawings attached, as possible, represent same or similar part with regard to utilizing same Ref. No..
Fig. 1 illustrates the example of the Frame that distributes according to fast feedback channel.As shown in Figure 1, by uplink map (UL-MAP), this BS sends to each MS with the fast feedback channel assignment information.MS receives this fast feedback channel assignment information, then, utilizes this fast feedback channel to send feedback information.Then, utilize this CQICH_enhanced_allocation_IE, this BS notice distributes this fast feedback channel address, MS must send the transmission cycle and the feedback kind information of feedback information.Then, receiving this fast feedback channel address assignment and sending the transmission week after date of this information, according to the appointment feedback kind that sends from this MS, this BS receiving feedback information with it.
As what select, this BS can utilize quick feedback sub-header from this MS receiving feedback information.At this, this BS can utilize this quick feedback sub-header to distribute this fast feedback channel address.
As mentioned above, which feedback information is this feedback kind regulation sent.In other words, the weighted value under the signal to noise ratio (snr) of this feedback information and downlink channel status, the mimo system situation and which sends between MIMO pattern or displacement patterns is information-related.Fig. 2 is the example of CQI feedback header.Can utilize CQI feedback header aperiodicity ground shown in Figure 2 to send feedback information.In addition, (respectively) content of CQI feedback header can change according to feedback kind.In addition, compare with sending a value of feedback in the prior art, this CQI feedback header can send two values of feedback at least.Therefore, utilize this feedback kind, can represent two values of feedback at least.At this, this feedback kind can be classified as two kinds.First kind relates to and periodically sends this value of feedback, and second kind relates to aperiodicity ground and send this value of feedback.For example, periodically send this value of feedback and comprise that this MS sends employed up link and sends (UL_TX) power and for the modulation that requires or this MS of code rate the preferred downlink of this BS request is used code (DIUC) at interval.In addition, for example, aperiodicity ground sends value of feedback and comprises MIMO weighting, mimo channel matrix H and Downlink channel estimation value.
When retransmitting this feedback information, about a plurality of MIMO combination of antennas are group, then, send these groupings antenna information and be included in this feedback information about the information of closed-loop MIMO.In header fields shown in Figure 2, the connection identifier (CID (CID) with " 1 " is defined in this Frame and has CID.On the contrary, if represent this CID, then do not utilize this CID, and utilize 32 bit representation feedback content by " 0 ".Meanwhile,, then can use 6 highest significant positions (MSB) in this feedback content (minimum 16, the longest 32), in addition, can use this MSB together with different values of feedback if the model selection designator is " 1 ".In addition, utilize this feedback kind, can send a plurality of values of feedback simultaneously.
Fig. 3 is when being illustrated in this MS distribution fast feedback channel or CQICH, receives to be used for the example of operation that aperiodicity sends the uplink radio resource assignment of snap information.In Fig. 3, according to the transmission cycle of this BS order, with this feedback information period send to this BS (S31, S32).For feedback header shown in Figure 2, this BS does not carry out periodic polls.In addition, for this feedback information is sent to this BS, this MS determines at first whether this BS has distributed CQICH to this MS.After definite this BS had distributed CQICH, this MS sent to BS request to the uplink resource allocation (Warning Mark) of this BS (S33) with request message.Send this Warning Mark by this fast feedback channel, then, this MS utilizes this Warning Mark to indicate it to have a mind to send feedback header to this BS.In addition, this Indication message is by fast feedback channel or strengthens the regulation coding of the payload position of fast feedback channel.In addition, this request message is the message of not asking for instructions of this MS transmission.In other words, this request message is not in response to and asks (solicitation) message or Indication message for instructions from this BS.On the contrary, according to definite transmitting channel state and other factors, this MS produces this automatically and does not ask message for instructions.
After this, respond this request, this MS receives the required uplink resource (S34) that BS distributes.Then, this MS utilizes the uplink resource that distributes to send at least one feedback header (S35) that comprises this feedback information.This feedback header can be called as not request header, because need not to send this header from asking for instructions of BS, this feedback header does not comprise payload.Like this, protocol Data Unit (PDU) only comprises feedback header, and does not comprise payload.
When sending this feedback header, the uplink resource by distributing can send to one or more feedback header this BS.If the feedback type field of this feedback header points out to exist more than one feedback kind, then this feedback header not only comprises first feedback kind, and second feedback kind and any subsequent feedback type are included in the feedback type field.For example, if the feedback kind of pointing out in this feedback type field is relevant with transmitted power and channel, the respective feedback content in then relevant with this transmitted power feedback kind and this feedback content field is included in this header together.In addition, utilize the remaining bit in this feedback kind and the feedback content field, the respective feedback content in the feedback kind relevant with this channel and this feedback content field is included in the header.Utilize this set, can in single header, comprise data or the content that occupies small number of bits, feasible this header of more effective transmission.
As what select,, then can utilize more than one header to send this feedback information if the destination is big and can not be included in one and do not ask for instructions in the feedback header for the feedback information of this BS.At this, the feedback kind in first and second feedback header is identical, to comprise identical feedback information.Have available position if send the last feedback header of the sequence feedback header of identical feedback information, then described in the above in the last feedback header of its operation and can comprise another feedback kind and feedback content.
Whether do not comprise that for this being asked for instructions feedback header more than one feedback kind notifies this BS, can specify a particular code to this feedback kind, wherein this BS utilizes this particular code this feedback header of can decoding to comprise a plurality of feedback kind and respective feedback content.For example, if this feedback kind is represented as " 1000 ", then this BS receives this feedback header, and knows that this feedback header comprises a plurality of feedback kind.Other any feedback kind codes can represent that this feedback header does not comprise a plurality of feedback kind.In a word, do not ask that feedback header comprises at least one feedback kind for instructions and corresponding at least one feedback content of this at least one feedback kind, and with this feedback kind code be what is irrelevant.
In addition, if as superincumbent situation, this BS distributes fast feedback channel or CQICH to specific MS, and then this CID field does not need to be included in the header.On the contrary, be used for representing that 1 resource that whether this CID is included in this header can be used to represent the value of this feedback content or information.
In addition, may exist MS wherein not need to ask to distribute the situation of uplink resource from BS.That is, this MS can use the current uplink resource that is used to send data.If utilize current uplink resource, then this MS can send and be included in this and do not ask feedback information in the feedback header for instructions.Like this, this MS just needn't the receiving uplink resource allocation, therefore, and can more effective transmission feedback information.
Fig. 4 is illustrated in when not distributing CQICH, receives the example of operation of the uplink resource allocation be used to send snap information.In Fig. 4, do not distribute MS by fast feedback channel or CQICH.Yet this MS determines at first whether this BS has distributed CQICH.If this MS determines not distribute this CQICH, then this MS sends to the BS that requires uplink resource allocation with request message (bandwidth request), to send feedback header (S41).This request message comprises bandwidth request CDMA code and bandwidth request header.More particularly,, at first send bandwidth request CDMA code, after this, send bandwidth request header as the part of request message.Respond this request, this BS distributes uplink resource (S42) to this MS.After this, this MS sends this feedback header (S43) by the uplink resource that distributes.
Fig. 5 illustrates the work of modulator/demodulator.As mentioned above, in Fig. 5, the data flow that serial is imported is converted to parallel data stream, then, each parallel data stream is used the IDFT scheme.In order to handle rapid data, use inverse fast fourier transform (IFFT) method.After each parallel data stream contravariant is changed to the subcarrier of respective number, before changing frequency, each parallel data of conversion is changed back serial data stream.After this, the data flow of this frequency shift is sent to receiving terminal, then, the signal that this receiving terminal utilization operation demodulation opposite with transmitting terminal received.
In the OFDM or OFDMA wireless communication system of prior art, by fast feedback channel, base station (BS) is from the determined value of mobile radio station (MS) receiving downlink channel status, and for this mimo system, this BS is from MS reception antenna weighted value.In addition, this BS receives the MIMO pattern of MS selection and the displacement patterns that MS selects.
Recent years, for each of a plurality of antennas by utilizing this BS and this MS improves frequency efficiency and network link storage, this mimo system is subjected to extensive concern in the mobile communication system that requires rapid data to send.In this mimo system, BS utilizes a plurality of antennas that data are sent to MS.After receiving the data of transmission, this MS estimates that this BS sends the channel information of each channel that data use, and utilizes each channel information of estimating to determine (respectively) weighted value, then, the weighted value of determining fed back or sends to this BS.By these input data are used the weighted value that sends, BS can be with the more accurate MS that sends to of these data.In mimo system, according to the data emitting method that a plurality of antennas of transmitting terminal adopt, this MIMO pattern is classified as various patterns, comprising: space-time emission diversity (STTD), spatial reuse (SM) and closed loop SM.
Meanwhile, the MS in OFDM or the OFDMA wireless communication system determines to send in the down link direction displacement patterns of use, then, the displacement patterns of determining is sent (perhaps feedback) to this BS as feedback information.At this, determine that displacement patterns refers to determine to carry out data allocations and the setting on the bandwidth that data send.That is, displacement patterns refers to select following any one: use subcarrier (FUSC) entirely, it utilizes all subcarriers in this bandwidth to realize diversity; Part is used subcarrier (PUSC), and it utilizes the subcarrier of ormal weight to realize diversity; And adjacent sub-carriers displacement (ASCP), it uses the subcarrier adjacent each other of ormal weight.
There is the whole bag of tricks to can be used for sending MIMO pattern that MS selects and displacement patterns as feedback information.For example, utilize the information word (IE) that channel quality information channel (CQICH) is provided periodically to send MIMO pattern and displacement patterns that MS selects.As what select, during the polling operation of this BS, utilize and send this MIMO pattern and displacement patterns with the quick feedback allocation sub-header that data send from this MS.In addition, distribute if this MS receives CQICH from BS, then, select MIMO pattern and/or displacement patterns to be included in this feedback information, then utilize CQICH to send Warning Mark, and utilize the model selection feedback header to send this MIMO pattern and/or displacement patterns.In frequent feedback not, perhaps when aperiodicity ground this MIMO pattern of feedback and/or displacement patterns, use the model selection feedback header.
Fig. 6 illustrates the structure of model selection feedback header.Send this model selection feedback header itself, and companion data part not.In Fig. 6, " feedback kind " field provides selects this MIMO pattern or displacement patterns, and " feedback content " provides the value of feedback payload.At this, feedback payload value refers to the MIMO pattern of MS selection and the indication of displacement patterns.
Utilize the feedback payload, send the details from MS to BS or the content of feedback information.This feedback payload can comprise at least 2, for example, and 4,5 or 6.In addition, MIMO pattern that MS selects and displacement patterns are mapped on each feedback payload, as table 1, shown in 2 and 3.This BS decoding then, is learnt MIMO pattern and displacement patterns that this MS selects by the value that this feedback payload receives from this BS, afterwards, sends this data image duration at follow-up data.
[table 1]
| Payload | Content |
| 0b0000 | STTD and PUSC/FUSC displacement |
| 0b0001 | STTD and adjacent sub-carriers displacement |
| 0b0010 | SM and PUSC/FUSC displacement |
| 0b0011 | SM and adjacent sub-carriers displacement |
| 0b0100 | Closed loop SM and PUSC/FUSC displacement |
| 0b0101 | Closed loop SM and adjacent sub-carriers displacement |
| 0b0110 | Closed loop SM+ pack and adjacent sub-carriers displacement |
| 0b1000～0b1111 | Keep |
[table 2]
| Payload | Content |
| 0b00100 | Mix and the PUSC/FUSC displacement |
| 0b00101 | Mix and the adjacent sub-carriers displacement |
| 0b00110 | Pack and adjacent sub-carriers displacement |
| 0b00111 | Closed loop SM and PUSC/FUSC displacement |
| 0b01000 | Closed loop SM and adjacent sub-carriers displacement |
| 0b1000～0b1111 | Keep |
[table 3]
| Payload | Content |
| 0b101100 | Closed loop SM and PUSC/FUSC displacement |
| 0b101101 | Closed loop SM and adjacent sub-carriers displacement |
| 0b101110 | Mix and the PUSC/FUSC displacement |
| 0b101111 | Mix and the adjacent sub-carriers displacement |
| 0b110000 | Pack and adjacent sub-carriers displacement |
| 0b110001 | Antenna sets A.For triantennary BS, 00= |
| 0b110001 | Antenna sets B.For triantennary BS, 00= |
| 0b110011 | Antenna sets C.For triantennary BS, 00= |
| 0b1000～0b1111 | Keep |
Table 2 and 3 content are newer, and are additional recently.Like this, the MIMO pattern of this MS selection and displacement patterns can be mapped to 5 feedback payload and 6 feedback payload respectively.
According to prior art, construct this model selection feedback header, only to comprise 4 feedback payload.5 feedback payload or 6 feedback payload that therefore, can not comprise new introducing.Therefore, can be not the MIMO pattern of shining upon and the content (perhaps information) of displacement patterns not be sent to BS as feedback in these 5 and 6 feedback payload.
Fig. 7 is the example that operation of the present invention is shown.In Fig. 7, MS selects MIMO pattern and displacement patterns (S21).When this MS selects, this MS can option table 1 to arbitrary content of table 3.After this MS had selected MIMO pattern and displacement patterns, this MS was included in the model selection feedback header feedback payload of this MIMO pattern and displacement patterns mapping, then, this feedback header is sent to this BS (S22).Fig. 8 illustrates the example of model selection feedback header.Compare with existing model selection feedback header, model selection feedback header shown in Figure 7 makes " feedback content designator " field and is used to hold larger data position (perhaps feeding back the number of payload position), that is, 6 capacity is included in " feedback content " field.
This feedback content indicator field is used for representing being included in the figure place of the feedback payload of this feedback content field.In other words, unlike the prior art, be provided with or add the feedback content indicator field, to support to utilize 4 feedback payload can not select 5 or 6 MIMO patterns and displacement patterns.For example, 4 of " 00 " expressions, 5 of " 01 " expressions, 6 of " 10 " expressions, " 11 " are " reservations ".
After this BS received the model selection feedback header, basis was included in the figure place (S23) of the definite feedback of the feedback content designator payload in this model selection feedback header after the BS.As mentioned above, this feedback payload is included in this feedback content field.In addition, this BS determines MIMO pattern and displacement patterns (S24) according to the quantity of the feedback payload position of determining from this feedback content field.
For example, if utilize " 01 " to represent this feedback content designator, the figure place that then is included in the feedback payload in this feedback content is 5.In addition, as shown in table 2 if the content of this feedback content field is " 11000 ", then the MIMO pattern and the displacement patterns of this MS selection are " closed loop SM and adjacent sub-carriers (AMC) displacements ".
In another example, if utilize " 10 " to represent this feedback content designator, the figure place that then is included in the feedback payload in this feedback content is 6.In addition, as shown in table 3 if the content of this feedback content field is " 110000 ", then the MIMO pattern and the displacement patterns of this MS selection are " pack and adjacent sub-carriers displacements ".
After this, this BS uses MIMO pattern and the displacement patterns that MS determines in subsequent data frame, and sends this data.
In another embodiment of the present invention, this BS can utilize quick feedback allocation sub-header that request is sent to MS so that value of feedback to be provided.In addition, the uplink resource that can also utilize this quick feedback allocation sub-header to distribute MS to use.Table 4 illustrates the data format of this quick feedback allocation sub-header.
[table 4]
| Grammer | Size | Note |
| FAST FEEDBACK allocation subheader{ | ||
| Allocation offset | 6 | |
| | 2 | The quick DL of 00-measures the quick MIMO feedback of 01-, antenna #0 10-quick MIMO feedback, |
| } |
Reference table 4, " distribution deviation " field come to receive the MS of quick feedback allocation sub-header, to be used in the value of the time slot position that sends feedback information according to the request branch of this BS since BS.According to prior art, by CQICH, utilize the time slot that is somebody's turn to do " distribution deviation " appointment, this MS sends the value of feedback of BS request.
Should " feedback kind " field be that this BS of expression wishes from the apportioning cost of the feedback information of this BS reception.More particularly, the value below this BS can distribute this MS.For example, this apportioning cost can be the Downlink channel estimation value (promptly, feedback kind=" 00 "), when having 2 antennas the weighted value of antenna #0 (, feedback kind=" 01 "), the weighted value of antenna # 1 when having 2 antennas (, and the variation of MIMO pattern or displacement patterns (that is feedback kind=" 11 ") feedback kind=" 10 ").In addition, if this MS wishes to change MIMO pattern or displacement patterns, then this BS can distribute uplink resource.Preferably, this uplink resource allocation can be applied to the uplink portion of subsequent frame.
Yet it is not seamless utilizing this quick feedback allocation sub-header to send feedback information.At first, the amount of information of utilizing quick feedback allocation sub-header can send in feedback information is restricted.Secondly, the amount of information that receives as feedback information is restricted, and this is because send this feedback information by the regulation time slot that distributes in this fast feedback channel.At last, when this MS wished to change MIMO pattern or displacement patterns, this BS only used the uplink resource that distributes to the uplink portion of subsequent frame.Like this, this MS may lose the chance of transmission feedback information up to subsequent frame, thereby causes inefficiency.
In order to solve and the quick relevant problem of feedback allocation sub-header, this BS will feed back request message and send to MS.In another embodiment of the present invention, this feedback request message can be to strengthen the form of quick feedback allocation type (EFAT) or feedback header (FS).By comprising feedback request message with EFAT or FS sub-header form, have this feedback information at least 2 kinds to the feedback method of this BS with every kind of form, simultaneously, can increase the information type that receives by this feedback information according to every kind of form.In addition, by utilizing medium access channel (MAC) header notice to exist the method for EFAT sub-header or FS to conform to prior art.
Fig. 9 illustrates the example of the data structure of Medium Access Control (MAC) Protocol Data Unit (PDU).In Fig. 9, this mac header is positioned at the front of this MAC PDU, and EFAT sub-header and FS header are positioned at the end of each MAC PDU.
Figure 10 is the example that the structure composition of mac header is shown.Preferably utilize mac header to point out to comprise EFAT sub-header or FS at the end of MAC PDU.Whether as mentioned above, mac header " type " can be used to provide the sub-header of other types whether available.Yet, in Figure 10, represent in the prior art that each " reservation " field of 1 can be used as designator, there are EFAT sub-header or FS header to notify respectively.
Figure 11 is the example that the Frame on the physical layer is shown.In Figure 11, this BS utilizes the DL-MAP information word (IE) of DL-MAP to send about this BS the address of the burst of this MS distribution and the information of size.This burst is made up of a plurality of packets, and each packet comprises mac header and sub-header respectively.When this MS made the feedback request of customizing messages, this BS preferably was attached to this EFAT sub-header the end of this packet.
[table 5]
| Grammer | Size (position) | Note |
| Enhanced Fast-Feedback Allocation Subheader{ | ||
| | 1 | 0=uses fast feedback channel (CQICH) 1=to use the feedback mac header |
| If allocation type＝0{ | ||
| Allocation offset | 6 | |
| | 4 | |
| Feedback type | 3 | |
| Frame offset | 2 | |
| }else{ | ||
| | 4 | |
| | 4 | |
| | 4 | |
| Frame offset | 3 | |
| } |
[table 6]
| Grammer | Size (position) | Note |
| Feedback Subheader{ | ||
| | 1 | 0=uses fast feedback channel (CQICH) 1=to use the feedback mac header |
| If allocation type＝0{ | ||
| Allocation offset | 6 | |
| | 4 | |
| Feedback type | 3 | |
| Frame offset | 2 | |
| }else{ | ||
| | 4 | |
| | 4 | |
| | 4 | |
| Frame offset | 3 | |
| } |
To be expression send designator from the method for the specific information request of this BS as feedback to " Allocation offset " field of table 5 and table 6.Specific information request from this BS is not limited to a kind of feedback method, but can comprise at least two kinds of feedback methods, this BS can select feedback method from these at least two kinds of feedback methods, and can determine any one feedback method according to channel status.For example, have two kinds if send the feedback method of feedback information, then first kind of feedback method can comprise by CQICH transmission feedback information, and second kind of feedback method can comprise use feedback mac header.In these two kinds of feedback methods, this BS selects first kind of feedback method or second kind of feedback method, then, orders this MS to send according to the feedback method of selecting.At this, this feedback method is not limited to top example, and can comprise other feedback methods.
If as feedback method, this BS selects to send feedback information by CQICH, and then " Allocation offset " field is the designator of the time slot position that is used to point out that this MS uses when sending feedback information.Specifically, determine this deviate according to the starting point of this CQICH.In addition, " CQICH_num " represents a plurality of CQICH time slots that this MS uses when feeding back the customizing messages of this BS request.
If as feedback method, this BS has selected to utilize the feedback mac header to send feedback information, and then " Duration " field in table 5 and the table 6 is the designator of operable Baud Length when pointing out this MS feedback information.A plurality of code elements are preferably used for feedback information, and are not limited to a code element.
" frame deviation " field is the designator of position that is used to point out to begin to feed back the time started of transmission, and according to the present frame that comprises the EFAT sub-header, it comprises deviate.MS preferably selects to begin Frame beginning to send feedback information, and after receiving the feedback information request message from this BS, needn't send feedback information in subsequent data frame.
" Feedback type " field is to point out to wish as this BS of feedback the designator of the customizing messages received.If as feedback method, this BS has selected to send feedback information by CQICH, and have a plurality of downlink channel status estimated values and antenna, then this MS can provide the information about the weighted value of each antenna, and can change MIMO pattern and/or displacement patterns.Meanwhile, if as feedback method, this BS has selected to utilize the feedback mac header to send feedback information, and is then as shown in table 7, and various information can be provided.In addition, this BS can provide " feedback kind " field with bitmap format, meanwhile, distributes uplink resource to receive a plurality of values of feedback.
[table 7]
| Feedback kind | Feedback content | Explanation |
| 0b0000 | As show to be provided with described in the 296d | MIMO pattern and displacement feedback |
| 0b0001 | The average CQI of DL (5) | 5 CQI feedbacks |
| 0b0010 | (5 8 of L the incidents (2) of index number (2)+antenna index+MIMO coefficient, 4,5,4,10,6) | MIMO coefficient feedback |
| 0b0011 | Preferred DIDU (4) | Preferred DL channel DIDU feedback |
| 0b0100 | UL-TX-Power (7) | The UL transmitted power |
| 0b0101 | Preferred DIUC (4)+UL-TX-Power (7)+UL-headroom (6)+CQI (5) | The PHY channel feedback |
| 0b0110 | N incident of the number of frequency band N (2)+" band index (6)+CQI (5) " | The CQI of a plurality of AMC frequency bands |
| 0b0011 | 0 incident (4 the)+feedback content (variable) of the number of feedback kind 0 (2)+feedback kind | The various feedback type |
| 0b1000～0b1111 | Keep |
Table 8 illustrates the preferred data format of FS.In table 8, with identical in table 6, this BS orders this MS to utilize feedback mac header feedback information, does not select one of CQICH feedback method or feedback mac header feedback method and this MS is not set.
[table 9]
| Grammer | Size (position) | Note |
| Feedback subheader{ | ||
| | 4 | |
| | 4 | |
| Allocation offset | 6 | |
| | 1 | In the OFDMA time slot |
| Frame offset(F) | ||
| } |
In table 8, should " UIUC " field comprise coding and the modulation intelligence that this MS transmission information is used, be to point out that this BS wishes from the designator of the customizing messages of this MS reception and be somebody's turn to do " Feedback type " field.In addition, should " Allocation offset " field be to distribute this MS to utilize it to send the designator of the time slot position of feedback information.Preferably, should begin time slot is counted to determine the starting point of deviate by last time slot, to specify this position from the corresponding data frame.Should " Slot-num " field be to point out that this MS is with the designator of feedback information to the number of time slot of this MS use.At this, can distribute 4 time slots at most, and if quaternary PSK be 1/2, then can utilize 192 (48 * 4 time slots) to send at most, and since this FS be up to 6, can specify 4 time slots at most.It should " Frame offset " field be the designator that is used to distribute the time started position of particular feedback information.Determine this deviate according to the current data frame that comprises FS.
Figure 12 is the example that " Feedback type " feedback operation is shown.In Figure 12, the data burst that this MS is distributed comprises 3 MAC PDU (1., 2., 3.), and they comprise DFAT sub-header and FS sub-header respectively.
That the one MAC PDU (1.) expression utilizes is that " Allocation offset " field is pointed out, send the feedback method of feedback information by CQICH.At this, for example, " distribution deviation " is set to " 1 ", and " Frame offset " is set to " 0 ", and " CQICH_num " is set to " 3 ".Therefore, in Figure 13, MS utilizes CQICH to go up the information distribution in the feedback subsequent data frame, rather than feedback is comprised 3 time slots of the information distribution in the present frame of MAC PDU feed back the customizing messages of this BS request.
The 2nd MAC PDU (2.) expression utilization " Allocation type " field feedback method that point out, that utilize feedback mac header transmission feedback information.At this, for example, " Duration " is set to " 1 ", and " Frame offset " is set to " 1 ".Therefore, in Figure 13, MS utilizes in the feedback mac header the information distribution in the feedback subsequent data frame, rather than feedback is comprised 2 time slots of the information distribution in the present frame of MAC PDU feed back the customizing messages of this BS request.Distribute identically with the uplink data burst, be provided for the Radio Resource of feedback information, can realize feeding back mac header and distribute by utilizing " Duration " in the table 5.
Figure 13 is the example that the composition of feedback mac header is shown.In Figure 13, the feedback mac header is the header that is used for feedback information shown in the feedback form 6.This MS can preferably utilize the required feedback information of " Feedback content " a large amount of BS of feedback of the feedback mac header of 16 bit representations.
Commercial Application
Those skilled in the art understand, in the situation that does not break away from essential scope of the present invention, can carry out various modifications and variations to the present invention. Therefore, the invention is intended to contain and fall into claims and be equal to various modifications and variations of the present invention in the described scope.
Claims (39)
1. method that in wireless communication system, sends feedback information, this method comprises:
Do not having under the situation of asking for instructions from BS, determining feedback information is sent to base station (BS);
Send a request message, divide to be used in request BS to be sent to few uplink resource of not asking header for instructions;
From the resource allocation of BS receiving uplink; And
At least one does not ask header for instructions to send this by the uplink resource that distributes.
2. method according to claim 1, wherein, this is asked for instructions is the instruction that BS sends feedback information.
3. method according to claim 2, wherein, this instruction comprises the position of the uplink resource of distribution.
4. method according to claim 2, wherein, this indication comprises the information about the feedback cycle that periodically sends feedback information.
5. method according to claim 2, wherein, this instruction comprises feedback kind.
6. method according to claim 2, wherein, this is asked for instructions is channel quality indicating channel (CQICH) _ allocation information word (IE).
7. method according to claim 2, wherein, this is asked for instructions is channel quality indicating channel (CQICH) _ enhanced_allocation information word (IE).
8. method according to claim 2, wherein, this is asked for instructions is quick feedback allocation sub-header.
9. method according to claim 1, wherein, this request message is a bandwidth request message.
10. method according to claim 1, wherein, this feedback information is included in this and does not ask for instructions in the header.
11. method according to claim 1 wherein, is not asked header for instructions having under the situation of payload to send this.
12. method according to claim 11, wherein, feedback protocols data cell (PDU) only comprises does not ask header for instructions and does not comprise payload.
13. method according to claim 1, wherein, this header comprises connection identifier (CID (CID).
14. method according to claim 1, wherein, this header does not comprise connection identifier (CID (CID).
15. method according to claim 14, wherein, this header is at most by 32 bit representations.
16. method according to claim 1 further comprises, if this BS has distributed fast feedback channel to MS, then sends Warning Mark with the request uplink resource allocation.
17. method according to claim 16, wherein, this Warning Mark is that fast feedback channel by fast feedback channel or enhancing is to the specific coding of payload position.
18. method according to claim 1, wherein, aperiodicity ground sends this and does not ask header for instructions.
19. method according to claim 1, wherein, each does not ask the feedback content field that feedback header comprises the feedback type field of representing at least one feedback kind and at least one feedback sort offset of expression for instructions, and wherein each field by at least 1 bit representation.
20. method according to claim 19, wherein, this feedback type field indication various feedback type.
21. method according to claim 20, wherein, a plurality of feedback kind and be included in corresponding to the feedback content of these a plurality of feedback kind are not asked for instructions in the feedback header.
22. method according to claim 1, wherein, this does not ask that feedback header comprises at least one feedback kind for instructions and corresponding at least one feedback content of this at least one feedback kind.
23. the method for a receiving feedback information in wireless communication system, this method comprises:
For uplink resource allocation receives request message from mobile radio station (MS), wherein under not from the situation of asking for instructions of base station (BS), send this request message;
Be identified for this MS is sent the uplink resource of not asking the header distribution for instructions at least;
The uplink resource allocation of determining is sent to this MS; And
At least receive by the uplink resource that distributes and not ask header for instructions.
24. method according to claim 23, wherein, this is asked for instructions is the instruction that BS sends feedback information.
25. method according to claim 23, wherein, this feedback information is included in this and does not ask for instructions in the header.
26. method according to claim 23 wherein, is not asked header for instructions having under the situation of payload to send this.
27. a method that sends feedback information in the wireless communication system with fast feedback channel that mobile radio station (MS) is distributed, this method comprises:
Do not having under the situation of asking for instructions from this BS, determining feedback information is sent to base station (BS);
Send Warning Mark with the request uplink resource allocation;
From this BS receiving uplink resource allocation; And
Send at least one by the uplink resource that distributes and do not ask header for instructions, wherein do not ask header at least for instructions and comprise feedback information.
28. method according to claim 27, wherein, this is asked for instructions is the instruction that BS sends feedback information.
29. method according to claim 27 wherein, is not having to send this header under the situation of payload.
30. method according to claim 27, wherein, this header does not comprise connection identifier (CID (CID).
31. method according to claim 27, wherein, aperiodicity ground sends this header.
32. method according to claim 27, wherein, this fast feedback channel is channel quality indicating channel (CQICH).
33. the method for a receiving feedback information in the wireless communication system with fast feedback channel that mobile radio station (MS) is distributed, this method comprises:
Receive the Warning Mark that is used for uplink resource allocation from this MS, wherein do not sending Warning Mark under the situation of asking for instructions from this base station (BS);
Determine that this MS is sent at least one does not ask the uplink resource that header distributes for instructions;
The uplink resource allocation of determining is sent to this MS; And
The uplink resource that utilize to distribute receives at least one header, and wherein this is not asked header for instructions and comprises feedback information.
34. method according to claim 33, wherein, this is asked for instructions is the instruction that BS sends feedback information.
35. method according to claim 33, wherein, this feedback information is included in does not ask for instructions in the header.
36. method according to claim 33 wherein, is not asked header for instructions having under the situation of payload to send this.
37. a method that sends feedback information in wireless communication system, this method comprises:
Do not having under the situation of asking for instructions from this BS, determining feedback information is sent to base station (BS);
Determine whether this BS has distributed channel quality indicating channel (CQICH);
Send a request message and be sent to few uplink resource of not asking header for instructions to ask the BS branch to be used in;
From this BS receiving uplink resource allocation; And
By the uplink resource that distributes, at least one does not ask header for instructions to send this.
38. a method that sends feedback information in wireless communication system, this method comprises:
Do not having under the situation of asking for instructions from this BS, determining feedback information is sent to base station (BS);
Determine whether this BS has distributed channel quality indicating channel (CQICH);
If this BS has distributed CQICH, then send Warning Mark and be sent to few uplink resource of not asking header for instructions to ask this BS branch to be used in;
From this BS receiving uplink resource allocation; And
At least one does not ask header for instructions to send this by the uplink resource that distributes.
39. a method that sends feedback information in wireless communication system, this method comprises:
By uplink resource data are sent to base station (BS);
Do not having under the situation of asking for instructions from this BS, determining feedback information is sent to this BS; And
Send at least one by the uplink resource that is used to send data and do not ask header for instructions.
Applications Claiming Priority (13)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2004-0083048 | 2004-10-18 | ||
| KR1020040083048A KR101029812B1 (en) | 2004-10-18 | 2004-10-18 | Method of feedback of MIMO mode and permutation type in OFDM/OFDMA mobile communications system |
| KR1020040083048 | 2004-10-18 | ||
| KR1020040089029 | 2004-11-03 | ||
| KR1020040089029A KR100932487B1 (en) | 2004-11-03 | 2004-11-03 | A method for transmitting feedback information for a multiple input / output system in a broadband wireless access system |
| KR10-2004-0089029 | 2004-11-03 | ||
| KR20040112927 | 2004-12-27 | ||
| KR10-2004-0112927 | 2004-12-27 | ||
| KR1020040112927 | 2004-12-27 | ||
| KR20050000930 | 2005-01-05 | ||
| KR1020050000930 | 2005-01-05 | ||
| KR10-2005-0000930 | 2005-01-05 | ||
| PCT/KR2005/003469 WO2006043773A2 (en) | 2004-10-18 | 2005-10-18 | A method of transmitting feedback information in an orthogononal frequency division multiplexing (ofdm)/ofdm access (ofdma) mobile communication system |
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| CN101040461A true CN101040461A (en) | 2007-09-19 |
| CN101040461B CN101040461B (en) | 2011-01-19 |
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| CN2005800352584A Expired - Fee Related CN101040461B (en) | 2004-10-18 | 2005-10-18 | A method of transmitting feedback information in an orthogononal frequency division multiplexing (OFDM)/ofdm access (OFDMA) mobile communication system |
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|---|---|
| CN101040461B (en) | 2011-01-19 |
| KR20060033957A (en) | 2006-04-21 |
| KR101029812B1 (en) | 2011-04-18 |
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