CN101203045B - Method for communication access net system to process fast feedback channel - Google Patents
Method for communication access net system to process fast feedback channel Download PDFInfo
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Abstract
The invention discloses a treatment method for rapid feedback channel of a communication access network system, comprising: A. the rapid feedback channel is distributed for a terminal and the distribution information is recorded; B. the reception of the feedback information of the rapid feedback channel is judged according to the recorded distribution information and processing operation is carried out with pertinence according to the reception of the feedback information. When abnormal reception occurs, the feedback information can not be analyzed and preset treatment operation for abnormal reception is started. The invention can enhance the probability of correct analysis of the feedback information so as to enhance the communication quality and save system resource.
Description
Technical field
The present invention relates to wireless communication field, especially relate to the processing method of a kind of communication access net system to fast feedback channel.
Background technology
OFDM (OFDM, Orthogonal Frequency Division Multiplexing) is a kind of multi-carrier modulation technology of special shape.Its basic principle is exactly to pass through string and exchange to data flow at a high speed, is assigned in the relatively low experimental process channel of transmission rate and transmits.
In the agreement 802.16e that uses the OFDM technology, access net system can be understood terminal information through fast feedback channel.Fast feedback channel is that of marking specially uses a sign indicating number (UIUC with uplink interval; Uplink Interval Usage Code)=0 the zone that indicates as quick feedback; The modulation system that adopts is quaternary PSK (QPSK); Fast feedback channel representes that with time slot distributing fast feedback channel is exactly to distribute the time slot that feeds back as fast.Fig. 1 is a kind of distribution situation sketch map of fast feedback channel.What this was shown in Figure 1 is that subcarrier does not use (PUSC entirely; Partial Usage of the Subchannels) the fast feedback channel distribution situation under the mode; Among the figure with the example that is arranged as of 4 fast feedback channels; One of them fast feedback channel time slot comprises the time slot of a upgoing O FDM, and the time slot of a upgoing O FDM comprises 3 subchannel and 2 symbols, and its distribution mode is similar with the mode in normal upstream data district.
Communication terminal (UE) can feed back following information on fast feedback channel:
A) channel measurement information, the i.e. test result of down channel quality;
B) ID of target BS, the ID of the target BS that sends when promptly the terminal need be switched;
C) many inputs and many output (MIMO) pattern informations; When having adopted the MIMO pattern in the system; The MIMO pattern information of current use is fed back at the terminal on feedback channel, comprise: the code book of the number of transmit antennas of use, radiation pattern, transmission antenna group, day line options, pre-coding matrix etc.;
D) MIMO coefficient;
E) Band AMC adjacent sub-carrier is arranged (Adjacent Subcarrier Permutation) relevant code word;
F) uplink transmission power at terminal (UL_TX_Power).
Said feedack is mainly used in power control, MIMO technology, switching and Band AMC technology etc.
The access net system of prior art (comprising base station and base station controller) is as long as receive feedback information on fast feedback channel; Will resolve this feedback information; Utilize the content of resolving to handle; And whether the reception condition of feedback information is not judged unusually, cause can causing Access Network to resolve feedback information by error when several kinds of feedback informations receive unusual situation below occurring:
1) Access Network has sent release information element (IE, Information Element) to the terminal, promptly require not feedback information on the fast feedback channel of appointment of terminal, but feedback information is still sent in the terminal on this fast feedback channel; 2) Access Network thinks that the fast feedback channel to a certain terminal distribution expires, but feedback information is also sent in this terminal on this fast feedback channel; 3) Access Network has been redistributed a new fast feedback channel to the terminal, and new distribution IE is not received at the terminal or the processing at terminal has problem, causes its still feedback information on the fast feedback channel of distributing to it originally; 4) feedback information on the channel of oneself possibly not distributed in the terminal.
If the parsing feedback content of Access Network mistake; Just may cause corresponding failure to be handled; For example power control failure, MIMO pattern mistake, handoff failure, Band AMC failure etc., and then cause the terminal not carry out correct communicating by letter with Access Network, even cause the terminal off-grid.
Summary of the invention
In view of this, technical problem to be solved by this invention is to provide the processing method of a kind of communication access net system to fast feedback channel, improving the probability that feedback information is correctly resolved, and then improves communication quality.
In order to realize the foregoing invention purpose, main technical schemes of the present invention is:
A kind of communication access net system is to the processing method of fast feedback channel, and said communication access net system is a broadband wireless orthogonal frequency division multiplex OFDM access net system, and this method comprises:
A, be terminal distribution fast feedback channel and record distribution information;
B, judge the feedback information reception condition on the fast feedback channel according to the assignment information that write down; And handle operation targetedly according to the feedback information reception condition; Be specially:, carry out following steps to each feedback cycle of each fast feedback channel:
B2, judge on current fast feedback channel, whether to receive feedback information, if receive, execution in step B3 then; Otherwise, execution in step B4;
B3, be judged to be first kind of normal reception condition, the feedback information that is received resolved process ends;
B4, be judged to be first kind of unusual reception condition, do not carry out the parsing of feedback information, start preset processing operation, process ends this first kind of unusual reception condition;
B5, judge on current fast feedback channel, whether to receive feedback information, if receive, execution in step B6 then; Otherwise, execution in step B7;
B6, judge whether current fast feedback channel is fast feedback channel to be discharged; If, then be judged to be second kind of unusual reception condition, do not carry out the parsing of feedback information; Start preset processing operation, process ends to second kind of unusual reception condition; Otherwise, be judged to be the third unusual reception condition, do not carry out the parsing of feedback information, start preset processing operation, process ends to the third unusual reception condition;
B7, be judged to be second kind of normal reception condition, do not deal with.
Preferably, the described processing to first kind of unusual reception condition of step B4 is operating as: the assignment information that resends current fast feedback channel is given corresponding terminal; Perhaps, discharge said fast feedback channel.
Preferably, said processing to second kind of unusual reception condition is operating as: the release information that resends current fast feedback channel is given corresponding terminal; Perhaps, with current fast feedback channel locking; And after the next feedback cycle of this fast feedback channel arrives, take a decision as to whether said second kind of normal reception condition, if, otherwise continue locking then with this fast feedback channel release.
Preferably, said processing to the third unusual reception condition is operating as: with current fast feedback channel locking; And after the next feedback cycle of this fast feedback channel arrives, take a decision as to whether said second kind of normal reception condition, if, otherwise continue locking then with this fast feedback channel release.
Preferably, further comprise: each reception condition is carried out counting operation respectively.
Preferably, before the processing operation that starts unusual reception condition, judge further whether the number of times of this unusual reception condition and/or the number of times of corresponding normal reception condition satisfy preset condition, if then start processing operation to this unusual reception condition; Otherwise, do not start processing operation to this unusual reception condition;
Said preset condition comprises: N2 reaches a preset threshold value, or N1 satisfies certain relation with N2, or N3 reaches a preset threshold value, or N3 satisfies necessarily with N4 and concerns; Wherein, N1 be for should feeding back and the correct correct number of times of feedback, and N2 be for should feeding back not the errors number of feedback, the errors number of N3 for not feeding back, and N4 is not for feeding back the not correct number of times of feedback.
Preferably; The described concrete mode of receiving feedback information that judges whether of step B2 and B5 is: the signal to noise ratio of measuring received signal on the current fast feedback channel; If said signal to noise ratio greater than preset threshold value, is then judged and on this fast feedback channel, is received feedback information this moment; Otherwise, judge and on this fast feedback channel, do not receive feedback information this moment.
Preferably, said communication access net system is a broadband wireless OFDM access net system.
With respect to prior art, because having increased according to the assignment information for the terminal distribution fast feedback channel, the present invention judges the feedback information reception condition on the fast feedback channel, receiving under the unusual situation; Do not carry out the parsing of feedback information; But start preset abnormality processing operation, therefore, when the feedback information on some fast feedback channels receives when unusual; Can avoid blindly resolving the parse error that causes; Improve the probability that feedback information is correctly resolved, and then avoided corresponding failure operation, improved communication quality; And saved the resource of system, but also can reduce the probability that exists two or more terminals to feed back simultaneously on the fast feedback channel.
Description of drawings
Fig. 1 is a kind of distribution situation sketch map of fast feedback channel;
Fig. 2 is a kind of concrete process chart to fast feedback channel of the present invention.
The signal illustration of the feedback information that Fig. 3 receives for the base station of specific embodiment one according to the invention.
The signal illustration of the feedback information that Fig. 4 receives for the base station of specific embodiment two according to the invention.
The signal illustration of the feedback information that Fig. 5 receives for the base station of specific embodiment three according to the invention.
Embodiment
Through specific embodiment and accompanying drawing the present invention is explained further details below.
Core technology scheme of the present invention is: communication access net system carries out specific aim to the feedback information reception condition of fast feedback channel to be handled.Specifically comprise: A, for terminal distribution fast feedback channel and record distribution information; B, judge the feedback information reception condition on the fast feedback channel, and handle operation targetedly according to the feedback information reception condition according to the assignment information that write down; Wherein when reception condition is unusual, do not carry out the parsing of feedback information, start preset processing operation unusual reception condition.
Communication access net system of the present invention can be for any access net system that utilizes fast feedback channel receiving terminal feedback information, comprising network equipments such as base station and base station controllers.Be that the present invention will be described for example with broadband wireless OFDM access net system below.
Fig. 2 is a kind of concrete process chart to fast feedback channel of the present invention.In the present invention, the time of the feedback cycle in every interval, the base station of Access Network is to every fast feedback channel circulation execution in step step shown in Figure 2.Described feedback cycle can be the minimum feedback cycle.The minimum feedback cycle is meant in the access net system minimum interval between the quick feedback information twice.In the 802.16e agreement, the minimum feedback cycle is a frame.
Referring to Fig. 2, following steps are all carried out to each feedback cycle of each fast feedback channel in the base station:
Whether step 201, base station inquiry should have feedback information this moment on current fast feedback channel; Just whether the base station has distributed this fast feedback channel to give certain terminal; The terminal is feedback information on this fast feedback channel at this moment; These assignment information need be recorded in after having assigned in the base station, and the judgement of this step is carried out in the base station according to the assignment information that is write down.If feedback information should be arranged, then continue next step 202, otherwise forward step 207 to.
Step 202, judge on current fast feedback channel, whether to have received base station at this moment feedback information.If receive feedback information, continue next step 203; Otherwise forward step 205 to.
Here, judge on current fast feedback channel, whether received base station at this moment feedback information concrete grammar can for:
A) signal to noise ratio of received signal (SNR, Signal to Noise Ratio) on the current fast feedback channel of base station measurement.
B) more said SNR and preset threshold value are if said SNR greater than preset threshold value, then judges and on this fast feedback channel, receives feedback information this moment; Otherwise, judge and on this fast feedback channel, do not receive feedback information this moment.
Step 203, the correct times N 1 that should feed back and correctly feed back add 1.This step is an optional step.
Step 204, judgement reception condition are normal condition 1, and this normal condition 1 is handled, and promptly the normal condition that should feed back and correctly feed back are handled.Being treated to here resolved received feedback information; Finish this flow process,, then need the processing operation of FEFO this abnormality 1 if last reception condition is an abnormality 1; Again received feedback information is resolved, finish this flow process.
Step 205, should feed back and not the feedback errors number N2 add 1.This step also is an optional step.
Step 206, judgement reception condition are abnormality 1, and abnormality 1 is handled, and the abnormality of promptly not feeding back feeding back is handled.Promptly do not carry out the parsing of feedback information, start preset processing operation, finish this flow process this abnormality 1.
Step 207, judge base station this moment on current fast feedback channel, whether to have received feedback information, the determination methods here can be identical with the described method of step 202, if receive feedback information, continues next step 208, otherwise forward step 2012 to.
Step 208, the errors number N3 that with not feeding back add 1.This step also is an optional step.
Step 209, judge whether current fast feedback channel is fast feedback channel to be discharged; Fast feedback channel said to be discharged distributes overdue fast feedback channel exactly; Or the not yet due fast feedback channel that discharges in advance, or the old allocated channel before the distribution of change fast feedback channel.If fast feedback channel to be discharged then continues next step 2010, otherwise forward step 2011 to.
Step 2010, judgement reception condition are abnormality 2; Abnormality 2 is handled; Promptly on fast feedback channel to be discharged, the abnormality of to not feeding back is handled, and mainly is the parsing of not carrying out feedback information; Start preset processing operation, finish this flow process abnormality 2.
Step 2011, judgement reception condition are abnormality 3; Abnormality 3 is handled; Promptly on unappropriated fast feedback channel, the abnormality of to not feeding back is handled, and mainly is the parsing of not carrying out feedback information; Start preset processing operation, finish this flow process abnormality 3.
Step 2012, general should not feed back not, and the correct times N 4 of feedback will not add 1.This step also is an optional step.
Step 2013, judgement reception condition are normal condition 2, and normal condition 2 is handled, promptly handle not feeding back the normal condition of not feeding back.
The processing mode to abnormality 1 described in the above step 206 has a variety of; For example reach a preset threshold value as N2; Or N1 and N2 be when satisfying certain relation (for example preset proportionate relationship), and the assignment information that can resend fast feedback channel is given the terminal.If can't get into normal condition 1 all the time, then can this fast feedback channel be discharged.Can arrive normal condition 2 when discharging fast feedback channel, or abnormality 2, concrete processing is referring to normal condition 2, or the explanation of abnormality 2.
The processing mode to abnormality 2 described in the above step 2010 has a variety of; For example reach a preset threshold value as N3; Or N3 and N4 be when satisfying certain relation (for example preset proportionate relationship), and the release information that can resend fast feedback channel is given the terminal.If can't get into normal condition 2 all the time, just adopt the processing mode of abnormality 3.
The processing mode to abnormality 3 described in the above step 2011 has a variety of, for example reaches a preset threshold value as N3, or N3 is when satisfying certain relation (proportionate relationship of for example presetting) with N4; Can any terminal not be distributed in this fast feedback channel locking, and after the next feedback cycle of this fast feedback channel arrives; Take a decision as to whether said normal condition 2; If, otherwise continue locking then with this fast feedback channel release.That is to say up to getting into normal condition 2 and just can the terminal that needs be distributed in this channel release.
The processing of the correct state 1 described in the above step 204 if last state is an abnormality 1, just finishes abnormality 1.Otherwise feedback information is normally resolved and carried out follow-up operating procedure, and these analytic techniques are identical with prior art with follow-up operating procedure, repeat no more here.
The processing of the correct state 2 described in the above step 2013; If last state is abnormality 2 or abnormality 3; Just finish processing operation to this abnormality; The release information that for example stops to send fast feedback channel for 2 of abnormalities is given the terminal, for 3 fast feedback channel releases with locking of abnormality.Otherwise be left intact.
Below in conjunction with more concrete data and embodiment the present invention is further specified.
Here, the base station judges according to the SNR that measures the feedback information signal that receives whether feedback information is arranged on the fast feedback channel.And suppose that SNR has feedback information greater than 5 expressions, otherwise expression there is not feedback information.
In the 802.16e mobile communcations system; Terminal distribution has been given in base station fast feedback channel, the beginning frame number of feedback is 10, feedback cycle is 2; What distribute is the 0th fast feedback channel, and the duration is that permanent feedback (being d=7) initiatively discharges fast feedback channel up to the base station.Feed back since the 10th frame at the terminal.The minimum feedback cycle in the system is a frame.
The signal illustration of the feedback information that Fig. 3 receives for the base station of specific embodiment one according to the invention.The signal of the feedback information that the base station receives on the 0th fast feedback channel is referring to shown in Figure 3:
(31) base station gets into abnormality 1 at the 10th frame and the double feedback information of not receiving of the 12nd frame.Possible reason is exactly that the terminal does not have the correct assignment information that send the base station of receiving, gives the terminal so the base station resends the assignment information of fast feedback channel.
(32) from the 12nd frame to the transmission and time of reception (different systems is different with this time of different allocation algorithms, only illustrates here) that 16 frames are assignment information.
(33) since the 16th frame, the base station can be correct receives feedback information, gets into correct status 1.
The signal illustration of the feedback information that Fig. 4 receives for the base station of specific embodiment two according to the invention.The signal of the feedback information that the base station receives on the 0th fast feedback channel is referring to shown in Figure 4:
(41) base station gets into abnormality 1 at the 10th frame and the double feedback information of not receiving of the 12nd frame.Possible reason is exactly that the terminal does not have the correct assignment information that send the base station of receiving, gives the terminal so the base station resends the assignment information of fast feedback channel.
(42) from the 12nd frame to the transmission and time of reception (different systems is different with this time of different allocation algorithms, only illustrates here) that 16 frames are assignment information.
(43) since the 16th frame, the base station does not still receive the feedback information at terminal, and the assignment information that promptly resends fast feedback channel is given after the terminal, and the feedback information at terminal still can't be received normally in the base station.Explain the terminal probably can't be on this fast feedback channel correct feedback information.Give the terminal so send the release information of fast feedback channel, this fast feedback channel is discharged.Get into and discharge monitor stages.
(44) from the 24th frame to 28 frames for sending and receive the release information time (different systems is different with this time of different allocation algorithms, only illustrates) of fast feedback channel here.
(45) do not receive the feedback information at terminal since 28 frame base station continuous several times, get into correct status 2.Explain that this fast feedback channel successfully discharges, can give the terminal that needs this channel allocation.
The signal illustration of the feedback information that Fig. 5 receives for the base station of specific embodiment three according to the invention.The signal of the feedback information that the base station receives on a unappropriated fast feedback channel is referring to shown in Figure 5:
(51) the 1st frames and the 3rd frame base station receive feedback information on this fast feedback channel, get into abnormality 3.With this channel locks, do not distribute to any terminal.
(52) since the 4th frame, the continuous multiple frames base station does not receive the feedback information at terminal again, gets into normal condition 2, explains that the interference signal on the unappropriated fast feedback channel disappears, and with this channel release, can distribute to the terminal of any needs.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with this technological people in the technical scope that the present invention disclosed; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (7)
1. a communication access net system is characterized in that to the processing method of fast feedback channel said communication access net system is a broadband wireless orthogonal frequency division multiplex OFDM access net system, and this method comprises:
A, be terminal distribution fast feedback channel and record distribution information;
B, judge the feedback information reception condition on the fast feedback channel according to the assignment information that write down; And handle operation targetedly according to the feedback information reception condition; Be specially:, carry out following steps to each feedback cycle of each fast feedback channel:
B1, judge on current fast feedback channel, whether should receive feedback information according to said assignment information, if, execution in step B2 then; Otherwise, execution in step B5;
B2, judge on current fast feedback channel, whether to receive feedback information, if receive, execution in step B3 then; Otherwise, execution in step B4;
B3, be judged to be first kind of normal reception condition, the feedback information that is received resolved process ends;
B4, be judged to be first kind of unusual reception condition, do not carry out the parsing of feedback information, start preset processing operation, process ends this first kind of unusual reception condition;
B5, judge on current fast feedback channel, whether to receive feedback information, if receive, execution in step B6 then; Otherwise, execution in step B7;
B6, judge whether current fast feedback channel is fast feedback channel to be discharged; If, then be judged to be second kind of unusual reception condition, do not carry out the parsing of feedback information; Start preset processing operation, process ends to second kind of unusual reception condition; Otherwise, be judged to be the third unusual reception condition, do not carry out the parsing of feedback information, start preset processing operation, process ends to the third unusual reception condition;
B7, be judged to be second kind of normal reception condition, do not deal with.
2. method according to claim 1 is characterized in that, the described processing to first kind of unusual reception condition of step B4 is operating as: the assignment information that resends current fast feedback channel is given corresponding terminal; Perhaps, discharge said fast feedback channel.
3. method according to claim 1 is characterized in that, said processing to second kind of unusual reception condition is operating as:
The release information that resends current fast feedback channel is given corresponding terminal;
Perhaps, with current fast feedback channel locking; And after the next feedback cycle of this fast feedback channel arrives, take a decision as to whether said second kind of normal reception condition, if, otherwise continue locking then with this fast feedback channel release.
4. method according to claim 1 is characterized in that, said processing to the third unusual reception condition is operating as: with current fast feedback channel locking; And after the next feedback cycle of this fast feedback channel arrives, take a decision as to whether said second kind of normal reception condition, if, otherwise continue locking then with this fast feedback channel release.
5. method according to claim 1 is characterized in that, further comprises: each reception condition is carried out counting operation respectively.
6. method according to claim 5; It is characterized in that; Before the processing operation that starts unusual reception condition; Further judge whether the number of times of this unusual reception condition and/or the number of times of corresponding normal reception condition satisfy preset condition, if then start the processing of this unusual reception condition is operated; Otherwise, do not start processing operation to this unusual reception condition;
Said preset condition comprises: N2 reaches a preset threshold value, or N1 satisfies certain relation with N2, or N3 reaches a preset threshold value, or N3 satisfies necessarily with N4 and concerns; Wherein, N1 be for should feeding back and the correct correct number of times of feedback, and N2 be for should feeding back not the errors number of feedback, the errors number of N3 for not feeding back, and N4 is not for feeding back the not correct number of times of feedback.
7. method according to claim 1; It is characterized in that; The described concrete mode of receiving feedback information that judges whether of step B2 and B5 is: the signal to noise ratio of measuring received signal on the current fast feedback channel; If said signal to noise ratio greater than preset threshold value, is then judged and on this fast feedback channel, is received feedback information this moment; Otherwise, judge and on this fast feedback channel, do not receive feedback information this moment.
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| CN101488829B (en) * | 2009-01-24 | 2011-12-28 | 华为技术有限公司 | Service processing method, base station and terminal combining adaptive code |
| US8588205B2 (en) * | 2010-02-12 | 2013-11-19 | Mediatek Inc. | Uplink power control message indexing in wireless OFDMA systems |
| US8520542B2 (en) * | 2010-02-12 | 2013-08-27 | Mediatek Inc. | Uplink power control message design in wireless OFDMA systems |
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| WO2006019263A2 (en) * | 2004-08-17 | 2006-02-23 | Lg Electronics Inc. | A method for establishing fast feedback channel and transmitting information in a wireless communication system |
| CN1961555A (en) * | 2004-06-01 | 2007-05-09 | 三星电子株式会社 | Method and apparatus for transmitting uplink fast feedback information in an ofdma communication system |
| CN101047469A (en) * | 2006-04-29 | 2007-10-03 | 华为技术有限公司 | Channel quality feedback method |
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| CN1961555A (en) * | 2004-06-01 | 2007-05-09 | 三星电子株式会社 | Method and apparatus for transmitting uplink fast feedback information in an ofdma communication system |
| WO2006019263A2 (en) * | 2004-08-17 | 2006-02-23 | Lg Electronics Inc. | A method for establishing fast feedback channel and transmitting information in a wireless communication system |
| CN101047469A (en) * | 2006-04-29 | 2007-10-03 | 华为技术有限公司 | Channel quality feedback method |
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