CN101060389A - A TD-CDMA system performance optimization method - Google Patents
A TD-CDMA system performance optimization method Download PDFInfo
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Abstract
The related performance optimization method for TD-CDMA system comprises: periodical detecting down physical channel quality and feeding back the index message CQI; endowing the up message according to the ACK/NAK and intelligent antenna wave; dynamic adjusting the feedback period according to user channel correlation and/or intelligent antenna requires Midamble precision, wherein, if user is static using pre-set period T1, and if user transmits, using per-set period T2 for CQI feedback, T2<T1. This invention ensures the DoA and message validity, and improves system performance greatly.
Description
Technical field
The present invention relates to the mobile communication technology field, be specifically related to the performance optimization method of TD-CDMA system.
Background technology
As UMTS air interface enhancement techniques, the R5 version of 3GPP has proposed high speed downlink packet access (HSDPA) scheme.Time-division duplex (TDD-CDMA) system as one of 3G standard need support the following all kinds of service bearers that are grouped into transmission form with IP equally.TDD-HSDPA is the product that tdd mode combines with the HSDPA technology, each key technology and Frequency Division Duplexing (FDD) (FDD) system class seemingly in its system, but distinctive physical layer frame structure of TDD system and transmission characteristic show unique characteristics TDD-HSDPA, more help the introducing of intelligent antenna technology as the up-downgoing channel reciprocity of TDD system, thereby raising radio link quality, further improve throughput of system, but also increased the complexity of RRM simultaneously.
The principle of smart antenna is the direction that wireless signal guide is concrete, produce the spatial orientation wave beam, make antenna main beam aim at subscriber signal arrival direction DOA (Direction of Arrival), secondary lobe or zero falls into aims at the interference signal arrival direction, reaches the purpose of fully efficiently utilizing mobile subscriber's signal and deletion or suppressing interference signal.Simultaneously, intelligent antenna technology utilizes the difference of signal space feature between each mobile subscriber, receive with launching a plurality of mobile subscriber's signals on same channel by the array antenna technology mutual interference does not mutually take place, make the transmission of the utilization of radio-frequency spectrum and signal more effective.Under the situation that does not increase system complexity, use smart antenna can satisfy the needs of the service quality and the network capacity extension.Intelligent antenna technology needs customer location and feedback of channel information comparatively timely, has further strengthened the requirement of TDD-HSDPA system uplink feedback information aspect resource occupation and feedback information validity.
In cdma system (TDD or FDD mode), adopt smart antenna and wave beam forming technology, can improve the performance of communication system greatly: improve the sensitivity of base station receiver, the equivalent transmitting power of base station transmitter, the interference of reduction system, increase the capacity of cdma system, improve the covering of sub-district, reduce the cost of wireless base station.
After adopting smart antenna, application of beam figuration technology can significantly improve the receiving sensitivity and the equivalent transmitting power of base station, can reduce the interference of internal system and the interference between the neighbor cell greatly, thereby makes the power system capacity expansion be twice above; The required number of base stations in professional highdensity urban district and suburb is reduced.
Current, the relevant channel quality information feedback of tradition HSDPA system is simple periodic feedback channel quality indication (CQI, Channel Quality Indicator) and triggering property feedback mix automatic repeat requests (HARQ, Hybrid Automatic Repeat Request) the required affirmation of technology correct/incorrect (ACK/NAK) indication.This can only satisfy the basic demand of channel quality information feedback, can increase in some cases effectively and timely " additional feedback " by improving on this simple feedback basis, further improves channel quality information feedback validity and promptness.
At document " Study of channel quality feedback in UMTS HSDPA ", IEEEproceeding 14
ThPIMRC, 2003 and " Efficient channel quality feedbackschemes for adaptive modulation and coding of packet data ", Vehicular Technology Conference, 2004.VTC2004-Fall.2004 among the IEEE60thVolume 2, to having carried out comparatively comprehensive and deep research based on channel-quality feedback in the HSDPA scheme of UMTS standard, propose in the literary composition: channel-quality feedback performance and cycle are a pair of contradiction.Though adopt the short period feedback to provide more timely effective information, will increase the intersymbol interference of uplink, thereby influence the reliability of transmission of feedback information for high-speed downstream message scheduling and transmission; The variation of channel conditions can not in time be provided though the up intersymbol interference of employing long period feedback is little, the more MCS of generation be falsely dropped select, be presented as the combination of modulation system and transmission block size, cause makeing mistakes, increase number of retransmissions, reduce throughput of system.Therefore how the choose reasonable feedback cycle has just become key problem to be solved.
As previously mentioned, intelligent antenna technology is easier to be realized in the TDD-CDMA system, and smart antenna is listed the TD-SCDMA standard in as necessary option.Though smart antenna can be gone up largely to improve transmitting gain and suppress to a certain extent and disturb between the inside and outside multi-user in sub-district, but needing bigger signaling and feedback information is cost, to ensure that up DoA estimates and the accuracy of down beam shaping (Beamforming).
In circuit-switched service is main TDD-CDMA system, if these information spinners are by realizing with the time-multiplexed Midamble sign indicating number of data bit in the physical frame structure.This is because circuit-switched service is equal substantially to the requirement of up-downgoing Radio Resource usually, there is property of channel reciprocity may between the uplink downlink that transmits on the same frequency band or is called stronger channel relevancy, and the transfer of data of circuit-switched service is continuous, network side can be known user position information in real time, obtains higher DoA and estimates and the beam shaping precision.But the up-downgoing resource requirement of packet switching service is seriously asymmetric in the TDD-HSDPA system, and transmission of packet data has sudden, therefore need share scheduling mode but not the fixed allocation mode is managed finite wireless resources with the time-division, up-downgoing this moment channel is discontinuous transmission, correlation a little less than, brought difficulty for TDD-HSDPA backward compatibility intelligent antenna technology.Have only by timely and the effective feedback mode provides the intelligent antenna technology information needed, just can make TDD-HSDPA realize that the intelligent antenna beam excipient becomes feasible.
Summary of the invention
In view of this, the object of the present invention is to provide the performance optimization method of a kind of TD-CDMA system, on the basis of periodic feedback, the cycle of dynamic adjustments feedback, with in time, feed back required channel quality indication (CQI) information effectively, increase user location information updating frequency, and effectively reduce system uplink interference and load, the precision of up angle of arrival estimation of smart antenna and down beam shaping in the raising system.
The performance optimization method of a kind of TD-CDMA provided by the invention system comprises step:
Periodically measure down physical channel quality and feedback channel quality indication information CQI, the information A CK/NAK of the data correctness that the feedback mobile terminal UE is received, and the required Midamble sign indicating number of feedback intelligent antenna beam figuration information;
According to the correlation and/or the required Midamble sign indicating number of the intelligent antenna beam shaping precision of subscriber channel, dynamically adjust the cycle of described feedback:
The first feedback on reservation period T 1 is set,, carries out the channel quality indication (CQI) information feedback with this first predetermined period T1 when user terminal is in the quiet period of transfer of data;
The second feedback on reservation period T 2 is set, during user terminal is carrying out the data transmission, carries out the channel quality indication (CQI) information feedback with this period T 2; T2＜T1 wherein.
This method further comprises: the up Midamble sign indicating number feedback factor (minimum interval of Midamble feedback is set, integral multiple for TTI) increases user location information updating frequency, the precision of up angle of arrival estimation of smart antenna and down beam shaping in the raising system.
The correlation of wherein said subscriber channel comprises channel circumstance and network load, disturbing factor, it is characterized in that, and is poor more and/or network load is heavy more and/or disturb when big more when channel circumstance, is provided with the value of the first feedback on reservation period T 1 more little.
The value of described T1 and T2 all can dynamically be adjusted, and is the integral multiple of Transmission Time Interval TTI.
When data block error rate BLER during greater than predetermined threshold value, reduce the value of the described second feedback on reservation period T 2, when data block error rate BLER during, increase the value of the described second feedback on reservation period T 2 less than predetermined threshold value.
When the data of descending Channel Transmission are made mistakes, strengthen the frequency of up channel feedback CQI information.
If the downlink data transmission mistake is then with receiving error in data indication information NAK at the up quality indication (CQI) information of delivering a letter that adds.
In sum, the present invention is by will be periodically and triggering property channel quality indication (CQI) feedback combine and regulate Midamble sign indicating number feedback information frequency by self adaptation ensures that the up angle of arrival of smart antenna (DoA) in the TDD system is estimated and the validity of down beam shaping information needed.
Utilize method of the present invention, can not increase on software and hardware requirement and the physical layer signaling expense basis, be used to ensure the promptness and the validity of channel-quality feedback with as far as possible little ascending wireless resource.Simultaneously, the present invention regulates Midamble sign indicating number feedback velocity by self adaptation and supports the extensively intelligent antenna technology of employing of institute of TD-CDMA system, regulated neatly that traditional C QI feedback information in the TD-CDMA system ensures and adjusted the transmission of feedback frequency and increase " additional feedback " during channel quality degrades, realization obtains the purpose of descending high-throughput and up low intersymbol interference simultaneously.Solved the contradiction between up joint-detection/downlink wave beam excipient required precision and the packet data transmission burst characteristic well, strengthen the backward compatibility ability of TD-CDMA system air interface scheme, bring into play the advantage that the TDD system combines with intelligent antenna technology better, thereby further improve throughput of system, transmission accuracy, reduce propagation delay time.
Description of drawings
Fig. 1 is the channel quality information feedback particular flow sheet in the system function optimization method of the present invention;
Fig. 2 A, 2B are the gained normalization BLER of system simulation result under omnidirectional antenna, the smart antenna;
Fig. 3 A, 3B are respectively that gained cell throughout curve simulation result is under omnidirectional antenna, the smart antenna;
Fig. 4 A, 4B are respectively the simulation result of the ratio distribution of gained feedback cycle under omnidirectional antenna, the smart antenna;
Fig. 5 A, 5B are respectively the simulation result of gained utilization of resources situation under omnidirectional antenna, the smart antenna;
Fig. 6 is according to TDD-HSDPA uplink information feedback schematic diagram of the present invention.
Embodiment
In order further to understand characteristic of the present invention and advantage, below the present invention is described in detail.
Main thought of the present invention is the frequency by uplink information feedback in the dynamic adjustment high-speed downlink packet access HSDPA, feedback channel quality information timely and effectively, with the transfer of data situation on the reflection high-speed downstream physical channel HS-DSCH, and according to up Midamble sign indicating number feedback factor, it is the minimum interval of Midamble feedback, integral multiple for TTI, timely feeding back uplink information, the up angle of arrival of smart antenna (DoA) is estimated and the down beam shaping precision in the raising system, so that more accurate user location information to be provided.The channel quality information of feedback comprises: periodically the down physical channel mass measurement is fed back, promptly usually said CQI feedback; Be used to indicate the affirmation ACK/ NAK feedback information unconfirmed of the received HS-DSCH data correctness of mobile terminal UE, this is fed back to triggering property feedback; The Midamble sign indicating number feedback that is used for realizing TDD system intelligent antenna technology and carries out.The present invention is by will be periodically and triggering property channel quality indication (CQI) feedback combine and regulate Midamble sign indicating number feedback information frequency by self adaptation ensures that the up angle of arrival of smart antenna (DoA) in the TDD system is estimated and the validity of down beam shaping.
In the high-speed packet CDMA access system, periodically measure down physical channel quality and feedback channel quality indication information CQI usually.High-rise (with respect to physical layer) signaling is determined a CQI feedback frequency by the travelling carriage that grouping inserts according to its disposal ability to all, is generally the integral multiple of Transmission Time Interval (TTI), and specifies corresponding up channel sign indicating number for it.Travelling carriage then carries out the CQI feedback information according to this frequency;
Rapid mixing retransmits (HARQ, Hybrid Automatic Repeat Request) automatically and is meant that the recipient under the situation of decoding failure, preserves the data that receive, and requires the transmit leg data retransmission; The recipient made up data that retransmit and the data that before received before decoding.Mix automatic retransmission technique and can improve systematic function significantly, and can adjust effective code element speed neatly, also can solve because the error code problem that adopts link adaptation to bring.Therefore in the high-speed packet CDMA access system, adopt the HARQ technology usually.For supporting to mix automatic repeat requests (HARQ,) technology, mobile station UE is after the transmission data that receive on the HS-DSCH, according to its HARQ type that adopts to its decode/whether this transmission of concurrent sentencing correct, and produce the ACK/NAK indication information, and on next available HS-SICH, feed back this information.Such is fed back to triggering property feedback, and feedback information is ACK/NAK, has only to feed back with CQI when this feedback just can transmit this two category information simultaneously when overlapping on timeslice.
The prior art content of the relevant UMTS-HSDPA that relates among the present invention is referring to document Study ofchannel quality feedback in UMTS HSDPA, IEEE proceeding 14
ThPIMRC, 2003 and " Efficient channel quality feedback schemes for adaptivemodulation and coding of packet data ", Vehicular TechnologyConference, 2004.VTC2004-Fall.2004 IEEE 60thVolume 2.
For more in time, support high speed downlink grouping traffic to insert effectively, considering that not increasing soft hardware equipment does not influence on the basis of current other standards, on the basis of periodically feeding back CQI, introduce and trigger the CQI feedback mechanism, and introduced Midamble sign indicating number feedback security mechanism for supporting intelligent antenna technology, the present invention proposes a kind of self adaptation and adjust the scheme of channel quality information feedback frequency, this scheme is carried out as follows:
Correlation and/or the required Midamble sign indicating number of intelligent antenna beam shaping precision of information according to subscriber channel, the first predetermined period T1 is set, when user terminal is in the quiet period of transfer of data, carry out the channel quality indication (CQI) information feedback with this first predetermined period T1;
Mourning in silence (IDLE) period of transfer of data, with T
1For the cycle feeds back.The precision of the correlation that main consideration subscriber channel is set of this parameter and the required Midamble sign indicating number of wave beam forming information and the reasonable distribution of ascending resource, the concrete setting of T1 value and the load and the channel circumstance of real network are closely related, as at abominable channel circumstance with network load is heavier, disturb under the heavier situation, then need to be provided with this value less.Concrete T1 value needs to adjust flexibly according to different situations, need carry out emulation to this value in the network planning and optimizing process and obtain optimal solution in conjunction with actual test result.
The second predetermined period T2 is set, during user terminal is carrying out the data transmission, carries out the channel quality indication (CQI) information feedback with this period T 2; T2＜T1 wherein;
For carrying out the user that data transmit, then with T
2For the cycle is carried out the CQI feedback information, every then N TTI upgrades a T
2Value.Update method is as follows: if the BLER (Block Error Rate) in N TTI then reduces T greater than BLER thresholding Threshold
2Value, otherwise increase T
2Value, and also scalable of T2 value increase and decrease amplitude.T
2Minimum value can be 1, promptly each TTI all feeds back, and reaches the full accuracy of system design and improves user location information more accurately to improve channel quality;
If the data of descending (HS-DSCH channel) transmission are made mistakes, then add the CQI information that passes, for information about with timely feedback at up HS-SICH channel.Because CQI information and Midamble sign indicating number institute beared information can feed back together along with NACK, do not take unnecessary resource;
Only comprise the situation of MCS (Modulation and Coding Set) proposed projects for CQI information, do not feed back when this MCS is consistent with the MCS scheme that sent last time, transfer of data is still carried out according to the MCS scheme of former CQI message advises.
Fig. 1 is the channel quality information feedback particular flow sheet in the system function optimization method of the present invention.
In such scheme, T1, T2, T3 all are set to the integral multiple of TTI.This schemes synthesis has been considered the sudden of Packet data service and reliability of data transmission requirement, is utilized as purpose in conjunction with the former to reduce ascending resource, thereby reduces uplink interference and guarantee the transmission of feedback information reliability; The latter considers mainly that then the promptness that ensures feedback information sends the correctness of selected MCS to ensure downlink data.This scheme mainly shows as the performance optimization of system: at first, with respect to traditional scheme, feed back with less frequency (IDLE) period of mourning in silence in transfer of data, can significantly reduce the frequency of feedback, thereby can reduce uplink interference, after transfer of data begins, because base station side need obtain more accurate CQI information, need to strengthen the feedback frequency of channel quality, so that user channel quality information to be provided in time, for the realization of technology such as descending Adaptive Modulation and Coding (AMC), packet scheduling provides more accurate information.Especially, consider because the quality of wireless channel fluctuation ratio is severe, in scheme, when Block Error Rate greater than certain thresholding, the channel quality information that shows base station user is accurate inadequately, mistake appears in the transmission of data, just needs to strengthen feedback frequency, so that more accurate user channel quality information to be provided.After Block Error Rate is reduced to below certain thresholding, show that transfer of data is more accurate, the user profile of base station side is comparatively accurate, promptly can reduce the feedback frequency of CQI, can significantly reduce uplink interference like this, ensures the accuracy of channel quality information transmission.If successively the CQI information unanimity of twice feedback can not need feedback, can reduce the feedback data amount like this, reduce system uplink load and interference.
The application-dependent of smart antenna is estimated and downlink wave beam excipient technology in up DoA, the base station at first uses training sequence (Midamble sign indicating number) to estimate the characteristic of channel on each bay, then according to the channel information on each bay, the arrival bearing who uses the DoA algorithm for estimating to calculate subscriber signal, thereby determine user's orientation, produce weighting matrix, regulate the amplitude and the phase value of each bay excitation, produce the downlink wave beam excipient.
Move user's position in the antenna system, particularly under high-speed case, can have a strong impact on the accuracy of up DoA estimation and downlink wave beam excipient, thereby make the BLER of system become big, the most serious when this problem is restarted new transfer of data after user data transmission stops a period of time.The Midamble sign indicating number feedback frequency that is used for DoA estimation and beam shaping by increase gets final product head it off with the azimuth information that more accurate user is provided.
For such scheme performance and feasibility are assessed, built a grade simulated platform of dynamical system it has been carried out simulation study, table 1 is depicted as a kind of relevant setting of exemplary, has provided the performance optimization result of this adaptation scheme under this exemplary.
| System | TD-SCDMA?HSDPA |
| Number of users | Variable |
| Artificial service | The www network browsing |
| Antenna | Omnidirectional antenna and guiding antenna |
| HARQ | HARQ?type?I |
| The maximum the number of transmissions that allows | 1 time |
| SAW | 4-channel?SAW |
| Dispatching algorithm | Round?Robin |
| The AMC measurement standard | Prediction PCCPCH (smart antenna is considered gain) |
| The AMC measure error | Desirable |
| The CQI feedback cycle | Variable, adaptation scheme adopts the set of (1,4,30) as the reference example |
| The HARQ feedback delay | 3 subframes (15ms) |
| The channel measurement feedback delay | 1 subframe (5ms) |
Feedback information whether in time and correctness will be presented as mainly whether MCS selects suitable: too high if MCS selects, then can cause the loading error occurring possibility to strengthen, system BLER will increase, so estimate the main performance index of this scheme is the BLER of system, consider that in addition uplink interference and ascending resource utilize situation, the PDF of feedback cycle also needs to carry out the selective analysis contrast, below is simulation result:
System BLER
Fig. 2 A, 2B are the gained normalization BLER of system simulation result under omnidirectional antenna, the smart antenna.Conventional feedback schemes T=3,4,5,10 and adaptation scheme with respect to the BLER of normalization system of this ideal scheme of T=1, as can be seen from Figure, the conventional feedback schemes performance classes of adaptation scheme performance and T=4 seemingly, and when system load is big, owing to disturb aggravation, BLER will increase, and the adaptation scheme probability that is in T=1 or T=4 strengthens like this, make its performance compare number of users after a little while more near the conventional feedback schemes performance of T=1 like this.
The sub-district average throughput
Fig. 3 A, 3B are respectively gained cell throughout curve simulation result under omnidirectional antenna, the smart antenna.Cell throughout curve from the graph can find out that the conventional feedback schemes performance of adaptation scheme performance and T=4 is close; Smart antenna is down because the effect of antenna gain and interference eliminated makes that each scheme performance difference is little.
The ratio of feedback cycle distributes
Fig. 4 A, 4B are respectively the simulation result of the ratio distribution of gained feedback cycle under omnidirectional antenna, the smart antenna.Along with number of users increases, system load strengthens, and selects the ratio of T=30 to reduce in the adaptation scheme, selects the ratio of T=4 and 1 to rise.Increase with system load, the system interference aggravation, Chuan Shu validity can not get ensureing like this, BLER adds senior general and causes selecting the probability of T=1 to strengthen.Because antenna gain that smart antenna is introduced and interference eliminated effect make that transmission availability and reliability raise under the smart antenna, compare omnidirectional antenna, its feedback cycle is that 4 and 30 probability wants big.Feedback cycle is that 4 probability is greatly because the reliability height of transmission, and feedback cycle be 30 probability is more greatly because the transmission availability height makes data can be transmitted end soon, thereby the time that enters into the IDLE state increases.
Utilization of resources situation
Fig. 5 A, 5B are respectively the simulation result of gained utilization of resources situation under omnidirectional antenna, the smart antenna.
As can be seen from Figure 5, adaptation scheme (21.1 users in every sub-district) its resource occupation when system load is big still is equivalent to the occupation condition of the conventional feedback schemes of T=12.This scheme reduces the frequency of up feedback, can significantly reduce uplink interference, guarantees the correctness of CQI information.Same owing to the system performance gain that smart antenna brought, even under the heavy load situation, its resource occupation is equivalent to the occupation condition of the conventional feedback schemes of T=18.
Simulation result from above-mentioned exemplary: under slight and heavy loads, this scheme has obtained corresponding performance to be less than about the conventional feedback schemes 3-4 utilization of resources doubly greatly.Even under overweight load, the utilization of resources of this scheme also is lower than conventional feedback schemes, and this point explanation this programme can be to guarantee the promptness and the validity of feedback information than the low-resource utilization.Thereby reduced feedback frequency just because of having reduced the utilization of resources in addition, thereby significantly reduced uplink interference to guarantee the accuracy of transmission of feedback information.This programme can obtain tangible performance optimization than traditional scheme.
Because in case find the data transmission credibility variation, this scheme improves feedback frequency immediately, can significantly improve the more precise information about user location like this, thereby makes that the precision of downlink wave beam excipient is higher.And, can pass Midamble information increase user location information updating frequency by adding because the utilization of resources reduces greatly.We have set a residue Midamble sign indicating number feedback factor Mf for this reason, the setting of this factor is mainly according to the required up precision of feeding back the Midamble sign indicating number of downlink wave beam excipient, specific practice is if certain user who is in the activation of service state feeds back without any uplink information at a continuous N f TTI, then add the once up feedback of biography, be provided for the Midamble sign indicating number information of DoA estimation and beam shaping, thereby obtained the up-to-date azimuth information of user.The way of final scheme can be referring to Fig. 6.
Among Fig. 6
Expression comprises the Midamble sign indicating number according to the CQI feedback information that traditional scheme need feed back;
The feedback of expression ACK just overlaps with tradition feedback CQI,
Expression meanwhile adds biography CQI and gives Node-B owing to loading error occurring feeds back NACK, changes MCS so that better adapt to current channel situation so that retransmit.
So expression feeding back ACK, but be not the time of user CQI feedback is feeding back ACK only.
Expression is without any feedback information.It should be noted that, the feedback frequency of each user's periodic feedback is unfixing among the figure, need adjust according to the BLER of downlink data transmission, user 1 may be in the quiet period of transfer of data, its feedback cycle is 8, and user's 4 possibility channel variation are more violent, and data transmission credibility is relatively poor, and its feedback cycle is 1.User 1 is not owing to there is uplink feedback information for a long time, and it adds and has passed a Midamble information (among the figure
Shown in, residue Midamble sign indicating number feedback factor Mf is made as 5).
The above is an one exemplary embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, change etc., all be included in protection scope of the present invention.
Claims (7)
1, the performance optimization method of a kind of TD-CDMA system is characterized in that, comprises step:
Periodically measure down physical channel quality and feedback channel quality indication information CQI, the information A CK/NAK of the data correctness that the feedback mobile terminal UE is received, and the required Midamble sign indicating number of intelligent antenna beam shaping;
According to the correlation and/or the required Midamble sign indicating number of the intelligent antenna beam shaping precision of subscriber channel, dynamically adjust the cycle of described feedback:
The first feedback on reservation period T 1 is set,, carries out the channel quality indication (CQI) information feedback with this first predetermined period T1 when user terminal is in the quiet period of transfer of data;
The second feedback on reservation period T 2 is set, during user terminal is carrying out the data transmission, carries out the channel quality indication (CQI) information feedback with this period T 2; T2＜T1 wherein.
2, performance optimization method as claimed in claim 1, it is characterized in that, this method further comprises: up Midamble sign indicating number feedback factor is set, increases user location information updating frequency, the precision of up angle of arrival estimation of smart antenna and down beam shaping in the raising system.
3, performance optimization method as claimed in claim 1, the correlation of wherein said subscriber channel comprises channel circumstance and network load, disturbing factor, it is characterized in that, poor more and/or network load is heavy more and/or disturb when big more when channel circumstance, be provided with the value of the first feedback on reservation period T 1 more little.
4, performance optimization method as claimed in claim 1 or 2 is characterized in that, the value of described T1 and T2 all can dynamically be adjusted, and is the integral multiple of Transmission Time Interval TTI.
5, performance optimization method as claimed in claim 1, it is characterized in that,, reduce the value of the described second feedback on reservation period T 2 when data block error rate BLER during greater than predetermined threshold value, when data block error rate BLER during, increase the value of the described second feedback on reservation period T 2 less than predetermined threshold value.
6, performance optimization method as claimed in claim 5 is characterized in that, when the data of descending Channel Transmission are made mistakes, strengthens the frequency of up channel feedback CQI information.
7, performance optimization method as claimed in claim 1 is characterized in that, if the downlink data transmission mistake, then with receiving error in data indication information NAK at the up quality indication (CQI) information of delivering a letter that adds.
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