CN105338565A - Channel state measuring method and apparatus - Google Patents
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Abstract
The invention relates to a channel state measuring method and apparatus. The channel state measuring method and apparatus are used for measuring the state of a channel of an LTE system, wherein the channel is a downlink static channel. The method comprises the following steps that: when a channel quality indication value is greater than a first quality threshold value, and if the error block rate of the channel is greater than or equal to an error block rate threshold value, the channel quality indication value is decreased to a first threshold value, and an operation flag bit is set; and when the operation flag bit is reset, and if the error block rate of the channel is smaller than the error block rate threshold value, and the channel quality indication value is smaller than a second quality threshold value, the channel quality indication value is increased to a second threshold value. According to the method, after the channel quality indication value is decreased, if the measured error block rate of the channel is smaller than the error block rate threshold value, up-regulation operation is not performed when the operation flag bit is set, and therefore, Ping-Pong adjustment of the channel quality indication value can be avoided; the error block rate of the channel is utilized to determine the channel quality indication value, so that an optimal channel quality indication value can be obtained, and maximum throughput efficiency can be achieved.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of channel measuring method and device of communications status.
Background technology
Long Term Evolution (LTE, LongTermEvolution) is the wide-band communication system with high-speed data service that 3GPP proposes, and is at present by the wireless communication technology extensively approved.Transmission channel due to radio communication is the channel of a multipath fading, random time-dependent, its channel condition information can constantly change, and due to this change, channel quality may be caused to fluctuate, so adopt adaptive coding modulation in LTE system, in the art, the channel quality of user terminal measurement downlink data, channel condition information is calculated according to channel quality, and by information feedback to base station.Running time-frequency resource and the transmission rate of the best, according to the channel condition information of feedback, dynamic are distributed for user in base station.
In LTE system, conventional channel status detection method is generally the signal to noise ratio (SNR by measuring channel, or the Block Error Rate (BLER of statistical channel SignaltoNoiseRatio), BlockErrorRatio) channel quality indicated value (CQI is obtained, ChannelQualityIndicator), the description to channel status is realized.
Can by measuring the SNR of the pilot signal (RS, ReferenceSignal) in channel, by searching channel SNR stored in advance and the mapping table of CQI, obtain current measured by the CQI corresponding to SNR that obtains; Also simple statistics channel BLER can be used to obtain the method for CQI, and the method determines CQI by the BLER of Statistical Physics DSCH Downlink Shared Channel (PDSCH, PhysicalDownlinkSharedChannel).
In indoor wireless environments or the position very near in distance base station, if travelling carriage keeps static, so its wireless channel also can be regarded as static, and the data volume that static wireless channel can carry can be thought constant.Under static channel, obtain the method for CQI by measurement pilot frequency SNR in above-mentioned channel status detection method and obtain CQI method all have problems by statistics PDSCHBLER.
Use and measure the table look-up method that obtains CQI of SNR and often to there are differences due to the mapping table of SNR and CQI and practical radio communication environment or SNR measure error causes cannot obtaining best CQI according to the SNR measured by current, thus cannot maximum data throughput.The method using simple statistics BLER to obtain CQI often appears in the process of BLER statistics; when BLER is greater than a certain thresholding, current C QI subtracts 1; be less than a certain thresholding current C QI and add 1, there will be the CQI that obtains at the upper and lower pingpang handoff of a certain critical value, cause throughput degradation.
The above-mentioned channel status detection method of simple use is at the white Gaussian noise (AWGN of LTE terminal, AWGN, AdditiveWhiteGaussianNoise) under condition, the throughput obtained when namely may occur that the SNR of channel is higher in the test of static channel environment be less than on the contrary SNR lower time the phenomenon of throughput that obtains, under some static environment of real network, as indoor environment, can not ensure that terminal obtains maximum throughput efficiency by CQI scheduling.
Summary of the invention
The problem that the present invention solves is in static channel conditions, and mobile terminal is difficult to Measurement accuracy and obtains best CQI, causes the problem being difficult to obtain maximum throughput efficiency.
For solving the problem, technical solution of the present invention provides a kind of method of measurement of channel status, for measuring the channel status of LTE system; Described channel is descending static channel, and described method comprises:
When described channel quality indicated value is greater than the first quality threshold, if the Block Error Rate of described channel is more than or equal to Block Error Rate threshold value, then described channel quality indicated value is lowered first threshold, and by position, operation flag position;
When resetting in described operation flag position, if the Block Error Rate of described channel is less than described Block Error Rate threshold value and described channel quality indicated value is less than the second quality threshold, then described channel quality indicated value is raised Second Threshold.
Optionally, the span of described Block Error Rate threshold value is [5%, 15%].
Optionally, described method also comprises:
Obtain channel quality detection value, described detected value obtain for the mapping table by searching signal to noise ratio and channel quality indicated value with the channel quality indicated value corresponding to the pilot SNR of described channel;
After described channel quality indicated value is adjusted, if described channel quality indicated value be greater than described detected value and interval threshold and value, then described channel quality indicated value is defined as described detected value and described interval threshold and value; If described channel quality indicated value is less than the difference of described detected value and described interval threshold, then described channel quality indicated value is defined as the difference of described detected value and described interval threshold.
Optionally, the span of described interval threshold is [1,3].
Optionally, also comprise: after described channel quality indicated value is adjusted, by the value zero setting of state counter.
Optionally, also comprise: every a LTE subframe, the value of described state counter is added 1.
Optionally, also comprise: when the value of described state counter is greater than time interval threshold value, the value of described state counter is set to 0, and described operation flag position is resetted.
Optionally, determine that described channel is descending static channel in the following way:
Obtain the broadband signal to noise ratio corresponding to present sub-frame of described LTE system and each subband signal to noise ratio respectively;
Obtain the first undulating value and the second undulating value, the difference of the initial value of the broadband signal to noise ratio of described first undulating value corresponding to described present sub-frame and broadband signal to noise ratio is determined, the difference of each initial value of each subband signal to noise ratio of described second undulating value corresponding to present sub-frame and correspondence each subband signal to noise ratio is determined;
If described first undulating value is less than or equal to the first fluctuation threshold value and the second undulating value is less than or equal to the second fluctuation threshold value, then the value of the first counter is added 1;
If the value of described first counter is more than or equal to the first frame number threshold value, then determine that described channel is descending static channel.
Optionally, described second undulating value is determined as follows:
The difference of the signal to noise ratio initial value of each subband signal to noise ratio and each subband of correspondence is sorted according to order from big to small;
Using the mean value of a front M difference as described second undulating value.
Optionally, the value of described M is determined based on the degree of fluctuation of the measurement result of the signal-to-noise ratio (SNR) Algorithm corresponding to the number of sub-bands of described LTE system and described subband.
Optionally, described method also comprises:
When described first undulating value is greater than described first fluctuation threshold value and the described second undulating value at least one condition be greater than in described second fluctuation threshold value sets up:
If the value of described first counter is less than frequency threshold value, then the value of described first counter is set to zero; Otherwise the value of described first counter is set to the value of described first counter and the difference of described frequency threshold value.
Optionally, also comprise:
If the value of described first counter is zero, then the initial value of described broadband signal to noise ratio is updated to the broadband signal to noise ratio corresponding to described present sub-frame, each initial value of described each subband signal to noise ratio is updated to each subband signal to noise ratio corresponding to described present sub-frame.
Optionally, also comprise:
After determining that described channel is descending static channel, if the first undulating value corresponding to present sub-frame is less than or equal to the first fluctuation threshold value and the second undulating value corresponding to present sub-frame is less than or equal to the second fluctuation threshold value, then the value of the second counter is added 1.
Optionally, also comprise:
If the value of described second counter is greater than or equal to tracking threshold value and the value of described first counter is less than the second frame number threshold value, then the value of the first counter is added 1.
Optionally, also comprise:
When the second undulating value be greater than corresponding to described first fluctuation threshold value and described present sub-frame of the first undulating value corresponding to the described present sub-frame at least one condition be greater than in described second fluctuation threshold value is set up:
If the value of described first counter is less than described frequency threshold value, then the value of described first counter is set to zero; Otherwise the value of described first counter is set to the value of described first counter and the difference of described frequency threshold value.
Optionally, described method also comprises:
If the value of described first counter is zero, then determine that present channel is descending dynamic channel.
Optionally, also comprise: the initial value of described broadband signal to noise ratio is updated to the broadband signal to noise ratio corresponding to described present sub-frame, each initial value of described each subband signal to noise ratio is updated to each subband signal to noise ratio corresponding to described present sub-frame.
For solving the problem, technical solution of the present invention also provides a kind of measurement mechanism of channel status, for measuring the channel status of LTE system; Described channel is descending static channel, and described device comprises:
Lower unit, for when described channel quality indicated value is greater than the first quality threshold, if the Block Error Rate of described channel is more than or equal to Block Error Rate threshold value, then described channel quality indicated value is lowered first threshold, and by position, operation flag position;
Raising unit, during for resetting in described operation flag position, if the Block Error Rate of described channel is less than described Block Error Rate threshold value and described channel quality indicated value is less than the second quality threshold, then described channel quality indicated value being raised Second Threshold.
Optionally, also comprise:
Detected value acquiring unit, for obtaining channel quality detection value, described detected value obtain for the mapping table by searching signal to noise ratio and channel quality indicated value with the channel quality indicated value corresponding to the pilot SNR of described channel;
Determining unit, for after adjusting described channel quality indicated value, if described channel quality indicated value be greater than described detected value and interval threshold and value, then described channel quality indicated value is defined as described detected value and described interval threshold and value; If described channel quality indicated value is less than the difference of described detected value and described interval threshold, then described channel quality indicated value is defined as the difference of described detected value and described interval threshold.
Optionally, also comprise: static channel determining unit, for determining that described channel is descending static channel, described static channel determining unit comprises:
Signal to noise ratio acquiring unit, for obtain described LTE system respectively present sub-frame corresponding to broadband signal to noise ratio and each subband signal to noise ratio;
Undulating value acquiring unit, for obtaining the first undulating value and the second undulating value, the difference of the initial value of the broadband signal to noise ratio of described first undulating value corresponding to described present sub-frame and broadband signal to noise ratio is determined, the difference of each initial value of each subband signal to noise ratio of described second undulating value corresponding to present sub-frame and correspondence each subband signal to noise ratio is determined;
CQI determining unit, for being less than or equal to the first fluctuation threshold value at described first undulating value and the second undulating value is less than or equal to the second fluctuation threshold value, adds 1 by the value of the first counter; When the value of described first counter is more than or equal to the first frame number threshold value, determine that described channel is descending static channel.
Optionally, described static channel determining unit also comprises: the first adjustment unit, for be greater than at described first undulating value described first fluctuation threshold value and described second undulating value be greater than described second fluctuation threshold value at least one condition set up time:
If the value of described first counter is less than frequency threshold value, then the value of described first counter is set to zero; Otherwise the value of described first counter is set to the value of described first counter and the difference of described frequency threshold value.
Optionally, described static channel determining unit also comprises: updating block, for being zero in the value of described first counter, then the initial value of described broadband signal to noise ratio is updated to the broadband signal to noise ratio corresponding to described present sub-frame, each initial value of described each subband signal to noise ratio is updated to each subband signal to noise ratio corresponding to described present sub-frame.
Optionally, also comprise: static channel tracking cell, for following the tracks of described static channel; Described tracking cell comprises: the second adjustment unit, for after determining that described channel is descending static channel, if the first undulating value corresponding to present sub-frame is less than or equal to the first fluctuation threshold value and the second undulating value corresponding to present sub-frame is less than or equal to the second fluctuation threshold value, then the value of the second counter is added 1.
Optionally, described static channel tracking cell also comprises: the 3rd adjustment unit, follows the tracks of threshold value and the value of described first counter is less than the second frame number threshold value, then the value of the first counter is added 1 for being greater than or equal in the value of described second counter.
Optionally, described static channel tracking cell also comprises: the 4th adjustment unit, when setting up for the second undulating value be greater than at the first undulating value described in place corresponding to present sub-frame corresponding to described first fluctuation threshold value and the described present sub-frame at least one condition be greater than in described second fluctuation threshold value: if the value of described first counter is less than described frequency threshold value, then the value of described first counter is set to zero; Otherwise the value of described first counter is set to the value of described first counter and the difference of described frequency threshold value.
Optionally, described static channel tracking cell also comprises: dynamic channel determining unit, and the value for described first counter is zero, determines that present channel is descending dynamic channel.
Compared with prior art, technical scheme of the present invention has the following advantages:
When static channel CQI is greater than the first quality threshold, if the Block Error Rate of described channel is more than or equal to Block Error Rate threshold value, then described CQI value is adjusted first threshold downwards, after downward, set operation is carried out in operation flag position; When resetting in described operation flag position, if the Block Error Rate of described channel is less than Block Error Rate threshold value and described CQI is less than the second quality threshold, described CQI is raised Second Threshold.The method is after described CQI adjusts downwards, if the Block Error Rate recording described channel is less than again described Block Error Rate threshold value, when described position, operation flag position, do not raise the operation of described CQI, situation about only resetting at described flag bit just does rise operation, the phenomenon of described CQI table tennis adjustment can be effectively avoided to occur, and determine described CQI value in conjunction with the situation of described channel Block Error Rate, can measure and obtain best CQI, the maximum throughput efficiency of channel after being reported by described CQI, can be obtained.
Judge that whether described channel is the method for static channel by the situation of change detecting broadband signal to noise ratio corresponding to the subframe in a period of time and each subband signal to noise ratio, accurately can determine whether present channel is static channel, effectively improve the accuracy that CQI obtains.
Further, after determining that channel is static channel, because channel circumstance is real-time change, can continue to monitor the situation of change of the broadband signal to noise ratio corresponding to the subframe of described channel and each subband signal to noise ratio, to realize the tracing detection to channel circumstance, can determine that present channel is static channel or dynamic channel in real time, effectively ensure that mobile terminal is in static channel environment, improve the accuracy of CQI value.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the method for measurement of the channel status that technical solution of the present invention provides;
Fig. 2 is the schematic flow sheet of the method for measurement of the channel status that the embodiment of the present invention provides;
Fig. 3 is the schematic flow sheet detected static channel that the embodiment of the present invention provides;
Fig. 4 is the structural representation of the measurement mechanism of the channel status that the embodiment of the present invention provides;
Fig. 5 is the structural representation of the static channel determining unit that the present embodiment provides;
Fig. 6 is the structural representation of the static channel tracking cell that the present embodiment provides.
Embodiment
In prior art, in static channel conditions, obtain the method for CQI by measurement pilot frequency SNR and obtain CQI method all have problems by statistics PDSCHBLER.
Use and measure the SNR method obtaining CQI of tabling look-up and often can cannot obtain best CQI because the mapping table of SNR and CQI and practical radio communication environment there are differences thus can not get data maximum throughput.
The method using simple statistics BLER to obtain CQI often there will be because BLER statistical fluctuation causes the upper and lower shake of CQI to cause throughput degradation.Often occur in LTE terminal static channel test process the throughput of the acquisition that SNR is high be less than on the contrary SNR lower time the phenomenon of throughput that obtains.
For solving the problem, technical solution of the present invention provides a kind of method of measurement of channel status.
As shown in Figure 1, step S1, when channel quality indicated value is more than or equal to the first quality threshold, if the Block Error Rate of described channel is more than or equal to Block Error Rate threshold value, then lowers first threshold by described channel quality indicated value, and by position, operation flag position.The initial value of described operation flag position is reset mode.
Step S2, when resetting in described operation flag position, if the Block Error Rate of described channel is less than described Block Error Rate threshold value and described channel quality indicated value is less than the second quality threshold, then raises Second Threshold by described channel quality indicated value.
The method is after described CQI adjusts downwards, if the Block Error Rate recording described channel is less than again described Block Error Rate threshold value, when described position, operation flag position, do not raise the operation of described CQI, situation about only resetting at described flag bit first just does rise operation, the phenomenon of described CQI table tennis adjustment can be effectively avoided to occur, and determine described CQI value in conjunction with the situation of described channel Block Error Rate, can measure and obtain best CQI, the maximum throughput efficiency of channel after being reported by described CQI, can be obtained.
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail specific embodiments of the invention below in conjunction with accompanying drawing.
Fig. 2 is the schematic flow sheet of the method for measurement of the channel status that the embodiment of the present invention provides, and as shown in Figure 2, first performs step S201, detects, to ensure that described channel circumstance is for static channel environment to described channel circumstance.
In this step, first need to detect described channel circumstance, to ensure that present channel is for static channel environment.
For the detection of described channel circumstance, by multiple method of the prior art, those skilled in the art can determine whether present channel environment is static channel.
In the present embodiment, judge whether described channel is static channel by the situation of change of the broadband signal to noise ratio corresponding to the subframe in detection a period of time and each subband signal to noise ratio.
Particularly, please refer to Fig. 3, Fig. 3 is the schematic flow sheet of the static channel detection that the present embodiment provides.
As shown in Figure 3, in the process that static channel is detected, first perform step S301, obtain the broadband signal to noise ratio corresponding to present sub-frame of described LTE system and each subband signal to noise ratio respectively.
In the present embodiment, in LTE system 2 Resource Block (RB, ResourceBlock) as a subband, such as, if system bandwidth is 20MHz, so system includes 100 RB, and 100 RB can be divided into 50 subbands in units of 2 RB.
RS pilot signal can be used to calculate the broadband signal to noise ratio of full bandwidth and the signal to noise ratio of each subband.
Particularly, the signal to noise ratio of RS pilot signals all in 20MHz can be transformed into log-domain, and averaged obtains described broadband signal to noise ratio, the signal to noise ratio of the RS pilot signal in each subband is transformed into log-domain, and averaged obtains the signal to noise ratio of corresponding each subband.
Perform step S302, based on the broadband signal to noise ratio corresponding to subframe and each subband signal to noise ratio, obtain the first undulating value and the second undulating value.
Described first undulating value is for describing the fluctuation situation of described broadband signal to noise ratio, and described first undulating value also can be called it is broadband signal to noise ratio undulating value.
Described first undulating value can the difference of initial value of broadband signal to noise ratio corresponding to described present sub-frame and broadband signal to noise ratio be determined.
Due to containing multiple subband, so the mean wave emotionally condition of described multiple subband signal to noise ratio can be described by described second undulating value, for each subband, can obtain should the subband signal to noise ratio undulating value of subband accordingly, described second undulating value can be determined based on described each subband signal to noise ratio undulating value.
The difference of each initial value of each subband signal to noise ratio of described second undulating value corresponding to present sub-frame and correspondence each subband signal to noise ratio is determined.
Particularly, the difference of the signal to noise ratio initial value of each subband signal to noise ratio and each subband of correspondence is sorted according to order from big to small, using the mean value of a front M difference as described second undulating value.
The initial value of described broadband signal to noise ratio and the signal to noise ratio initial value of each subband can be set to-255, the value of described M sets accordingly according to the measurement result degree of fluctuation of subband signal-to-noise ratio (SNR) Algorithm each under LTE bandwidth and static channel, with 20MHz, 50 subbands are example, in the present embodiment, the value of described M can be 6.
Perform step S303, when described first undulating value is less than or equal to the first fluctuation threshold value and the second undulating value is less than or equal to the second fluctuation threshold value, the value of the first counter is added 1; When the value of described first counter is more than or equal to the first frame number threshold value, then determine that described channel is descending static channel.
Within one period of detection time, can transmit the content of multiple subframe in channel, for each subframe, described first undulating value and the second undulating value can be obtained accordingly, then for any one subframe, when acquiring the first undulating value corresponding to this subframe and be less than or equal to the first fluctuation threshold value and the second undulating value being less than or equal to the second fluctuation threshold value, the value of described first counter is added 1, then according to described first counter the value obtained that adds up, the number of the subframe meeting above-mentioned condition can be got.
When the number of the subframe satisfied condition reaches the first frame number threshold value, when namely the value at described first counter described above is more than or equal to described first frame number threshold value, determine that described channel is descending static channel.
Can preset fluctuation threshold value, described first fluctuation threshold value, the second fluctuation threshold value and the first frame number threshold value can require according to the static degree for channel quality and experimental data etc. sets accordingly.If require higher to the degree of channel quiet, what described first fluctuation threshold value, the second fluctuation threshold value can be arranged is smaller, and what described first frame number threshold value can be arranged is larger.
In the present embodiment, for described first fluctuation threshold value be 0.8 (dB), described second fluctuation threshold value is 1.2 (dB), described first frame number threshold value is 80 to be described.
In the present embodiment, when meeting the first undulating value and be less than or equal to 0.8 (dB) and the number that the second undulating value is less than or equal to the subframe of 1.2 (dB) reaching 80 frames, can determine that described channel circumstance is descending static channel environment.
It should be noted that, in the process as above channel circumstance detected, continuous some frame subframes may be there is and meet above-mentioned condition, namely the first undulating value met corresponding to each subframe is less than or equal to described first fluctuation threshold value and the second undulating value is less than or equal to described second fluctuation threshold value, there is again the subframe not meeting above-mentioned condition afterwards, be the stability of static channel in order to ensure described channel circumstance, can when present sub-frame meet above-mentioned condition, the value of described first counter is adjusted, to pass through the more detection to subframe, ensure the stability of described static channel.
Such as, when the first undulating value corresponding to subframe is greater than described first fluctuation threshold value and/or the second undulating value is greater than described second fluctuation threshold value, if the value of described first counter is less than frequency threshold value, then the value of described first counter is set to zero; Otherwise the value of described first counter is set to the value of described first counter and the difference of described frequency threshold value.
Described frequency threshold value also can set according to the static demand binding tests data etc. of channel accordingly, and such as, in the present embodiment, described frequency threshold value can be set to 10.
When subframe does not meet above-mentioned condition, if when the value of described first counter is more than or equal to 10, then the value of described first counter is deducted 10, as the value of described first counter after renewal; If the value of described first counter is less than 10, then the value of described first counter is set to 0.
Again be when zero in the value of described first counter, the initial value of broadband as above signal to noise ratio and the signal to noise ratio initial value of each subband can be redefined, in order to detect subsequent channel environment on this channel circumstance basis.
In the present embodiment, can using the initial value of the value of the broadband signal to noise ratio now corresponding to subframe as described broadband signal to noise ratio, the value of each subband signal to noise ratio now corresponding to subframe is respectively as the signal to noise ratio initial value of described each subband, on this basis subsequent channel environment is checked, until detect that channel circumstance is static channel environment.
Can be detected present channel environment by step S301 as above to step S303, to ensure that described channel circumstance is for static channel environment.
After determining that described channel circumstance is static channel environment, can detect the CQI of described static channel, for detecting channel status.
In order to ensure in the process of CQI detection, be in by the determined static channel environment of step S301 to step S303 always, need in the process detected at CQI, proceed to follow the tracks of, the situation of change of channel circumstance can be understood in real time to described static channel environment.
Below the tracing process of static channel is described.
After determining that described channel is descending static channel, the first undulating value corresponding to present sub-frame is less than or equal to the first fluctuation threshold value and the second undulating value corresponding to present sub-frame is less than or equal to the second fluctuation threshold value, then the value of the second counter is added 1.
Record is carried out by the number of described second counter to the qualified subframe of tracking phase, the initial value of described second counter is set to 0, after determining that described channel is descending static channel, if present sub-frame meets the first undulating value and is less than or equal to the first fluctuation threshold value and the second undulating value is less than or equal to the condition of the second fluctuation threshold value, then by the value of described second counter cumulative 1.
Similar with the detection-phase of static channel as above, in the process that static channel environment is followed the tracks of, continuous some frame subframes may be there is and meet above-mentioned condition, there is again the subframe not meeting above-mentioned condition afterwards, be the stability of static channel in order to ensure described channel circumstance, when present sub-frame does not meet above-mentioned condition, the value of described first counter can be adjusted.
Such as, if when the first undulating value corresponding to tracking phase subframe is greater than described first fluctuation threshold value and/or the second undulating value is greater than described second fluctuation threshold value, if the value of described first counter is less than described frequency threshold value, then the value of described first counter is set to zero; Otherwise the value of described first counter is set to the value of described first counter and the difference of described frequency threshold value.
Namely when subframe does not meet above-mentioned condition, if when the value of described first counter is more than or equal to 10, then the value of described first counter is deducted 10, as the value of described first counter after renewal; If the value of described first counter is less than 10, then the value of described first counter is set to 0.
Due in static channel detection-phase, after determining that described channel is static channel, the value of described first counter should be more than or equal to described first frame number threshold value 80, so in the process of following the tracks of, do not meet in the process of above-mentioned condition in appearance, 10 can be reduced to the value of described first counter at every turn.
By if upper type is to after determining that channel is static channel, again the value of described second counter is set to 0, to follow the tracks of channel circumstance.
Consider, occurring, in the process do not satisfied condition, or may to occur the situation of the subframe that multiframe satisfies condition continuously, so should consider under certain conditions accordingly, the value of described first counter should being increased accordingly.
Particularly, in the present embodiment, if at tracking phase, when the value of the second counter as above is greater than or equal to tracking threshold value, if when now the value of described first counter is less than the second frame number threshold value, then: present sub-frame meet the first undulating value be less than or equal to the first fluctuation threshold value and the second undulating value is less than or equal to the condition of the second fluctuation threshold value time, by cumulative for the value of described first counter 1; Present sub-frame do not meet first wave move value be less than or equal to the first fluctuation threshold value and the second undulating value is less than or equal to the condition of the second fluctuation threshold value time, if when the value of described first counter is more than or equal to 10, then the value of described first counter is deducted 10, as the value of described first counter after renewal; If the value of described first counter is less than 10, then the value of described first counter is set to 0.
Meanwhile, when the value of the second counter as above is more than or equal to tracking threshold value, described two Counter Values is set to 0, after setting to 0 described second counter, continues to follow the tracks of channel circumstance.
Described tracking threshold value and the second frame number threshold value can require according to the static degree for channel quality and experimental data etc. sets accordingly.In the present embodiment, described tracking threshold value can be set as 5, and described second frame number threshold value is set as 20.
Above-mentioned in the tracing process of static channel, there is the change increasing or reduce in the value of described first counter, again be when zero in the value of described first counter, namely illustrate that present channel environment has not met require that of static channel environment, judges that present channel environment is dynamic channel environment.Need to continue the detection-phase turning back to static channel environment, channel circumstance is detected, to ensure that described channel circumstance is for static channel environment.
It should be noted that, in the tracing process of static channel as above, when adjusting the value of the first counter, the value of described first counter at the initial value of tracking phase for being more than or equal to described first frame number threshold value 80, in the process of following the tracks of, occurring in the process do not satisfied condition, 10 can be reduced (when the value of described first counter is less than 10 to the value of described first counter at every turn, the value of described first counter is made to equal 0), to realize the adjustment of the value to described first counter.In other embodiments, also the initial value of described first counter can be made for other value at tracking phase, such as be less than the value of described first frame number threshold value, so that after determining that described channel is static channel, when not satisfying condition, within less frame number, just can determine whether described static channel still meets the requirement of static channel, to realize timely to static channel, follow the tracks of accurately, such as, in other embodiments, at tracking phase, the initial value of described first counter can be set to 20, afterwards tracking phase adopt tracking described by the present embodiment realize to as described in the tracking of static channel.
When the value of described first counter is zero, can by each subband signal to noise ratio corresponding to the broadband signal to noise ratio corresponding to present sub-frame and present sub-frame, be defined as the initial value of the broadband signal to noise ratio in Channel Detection detection-phase and the signal to noise ratio initial value of each subband respectively, simultaneously by the first counter as above, the second counter and being all set to initial value 0 to the Status Flag counter in the CQI testing process of described static channel, operation flag position etc., this channel circumstance basis is continued detect static channel environment.
By the detection and tracking to static channel environment described above, can ensure that this patent proposes to carry out in static channel environment the detection method of channel status CQI.
After being determined that by step S201 present channel is static channel, the BLER based on added up PDSCH determines CQI, specifically please refer to step S202 to step S09 to the detection of the CQI of described static channel.
Perform step S202, the Block Error Rate of statistics present physical DSCH Downlink Shared Channel.
Namely add up the BLER of PDSCH, specifically can add up the BLER of current PDSCH in n subframe, the value of n can be 10 ~ 20 subframes.Acquisition process for the BLER of PDSCH is well known to those skilled in the art, and does not repeat them here.
Perform step S203, obtain channel quality indicated value CQI
static.
The initial value of present channel can be set to by the CQI value that pilot SNR obtains according at static channel detection-phase.
Particularly, in step s 201 in static channel testing process, RS pilot signal can be used to get the signal to noise ratio of channel, and then by searching the mapping table of channel SNR and CQI, can obtain and the CQI value corresponding to the signal to noise ratio of described channel, initial value using this CQI value as the CQI of described channel, namely as the CQI value of present channel, is designated as CQI at this
static.
Perform step S204, judge whether described Block Error Rate is more than or equal to Block Error Rate threshold value.
Described Block Error Rate threshold value can set accordingly according to communication protocol etc., and the span of such as described Block Error Rate threshold value can be [5%, 15%].
In the present embodiment, according to the related definition that 3GPP agreement is chosen CQI, when the Block Error Rate of MCS data transfer mode under present channel requiring described CQI corresponding is less than 10%, so Block Error Rate threshold value is set to 10%.
When the Block Error Rate of the present physical DSCH Downlink Shared Channel obtained by step S202 is more than or equal to described Block Error Rate threshold value, when namely the judged result of step S204 is for being, perform step S205; Otherwise perform step S206.
Step S205, at described CQI
staticwhen being greater than the first quality threshold, by described CQI
staticlower first threshold, and be set by operation flag; Otherwise keep described CQI
staticconstant.
Due in 3GPP agreement CQI with 0 ~ 15 integer value represent different CQI grades, so in the present embodiment, described first quality threshold can be set to 1, the second quality threshold being used for describing CQI maximum occurrences is set to 15.
In the present embodiment, to described channel quality indicated value CQI
staticcarry out in the process adjusted, the step-length of adjustment is set to a CQI grade, and namely the value of the amplitude first threshold lowered as above is 1, and the amplitude Second Threshold of rise is set to 1 equally.
In other embodiments, can set accordingly described first threshold, Second Threshold, the first quality threshold and the second quality threshold etc. in conjunction with real system.
In step S205, as described CQI
staticwhen being greater than 1, by described CQI
staticdeduct 1 as the CQI of present channel
static; If described CQI
staticwhen equaling 1, keep CQI
staticconstant.
In order to described channel quality indicated value CQI
staticsituation about raising or lower identifies, and can arrange an operation flag position, to described channel quality indicated value CQI
staticafter downward, can by position, described operation flag position, the initial value of described operation flag position is 0, i.e. reset mode.
Particularly, being describedly in the present embodiment operating as of set is carried out to operation flag position described operation flag position is set to-1.
Step S206, resets and CQI in operation flag position
staticwhen being less than the second quality threshold, by described CQI
staticraise the CQI of Second Threshold as present channel
static; Otherwise keep CQI
staticconstant.
As described channel quality indicated value CQI
staticbe less than the second quality threshold as above when arranging 15, by described channel quality indicated value CQI
staticadd that 1 as the described channel quality indicated value CQI of present channel
static; Otherwise keep described channel quality indicated value CQI
staticconstant.
After step S205 or step S206, perform step S207.
Step S207, obtains channel quality detection value CQI
sNR, by described channel quality detection value CQI
sNRwith described CQI
staticvalue compares, to determine the CQI of present channel
staticvalue.
RS pilot signal can be used to get the signal to noise ratio of present channel, and then by searching the mapping table of channel SNR and CQI, obtain and the channel quality indicated value CQI corresponding to the signal to noise ratio of described channel
sNR, using by accessed channel quality indicated value of tabling look-up as described channel quality detection value CQI
sNR.
By the described channel quality indicated value CQI by obtaining after step S206 or step S207 adjustment
staticvalue and described channel quality detection value CQI
sNRcompare.
If described channel quality indicated value CQI
staticmeet CQI
static> CQI
sNR+ Max_CQI_Det, then described CQI
static=CQI
sNR+ Max_CQI_Det, wherein, described Max_CQI_Det is default interval threshold, and the span of described interval threshold can be 1 ~ 3 in the present embodiment.
At described channel quality indicated value CQI
staticmeet CQI
static< CQI
sNRduring-Max_CQI_Det, then described CQI
static=CQI
sNR-Max_CQI_Det.
Perform step S208, to described CQI
staticafter adjusting, by state counter zero setting; Every a LTE subframe, the value of described state counter is added 1, when the value of described state counter is greater than time interval threshold value, by the value zero setting of described state counter, and operation flag position is resetted.
To described channel quality indicated value CQI
staticafter adjustment, can by state counter to current C QI
staticretention time counts.Each to described channel quality indicated value CQI
staticafter adjustment, first by the described value zero setting by state counter, then every a LTE subframe, the value of described state counter is added 1, when the value of described state counter is greater than time interval threshold value, the value of described state counter can be set to zero, and operation flag position is resetted.
Particularly, described time interval threshold value can set accordingly according to concrete deal with data, in the present embodiment, the span of described time interval threshold value can be set to [500,1000], the described time interval, namely described time interval threshold value can be set to 500 ~ 1000 subframes in units of subframe.
Describedly in the present embodiment being operating as of set is carried out to operation flag position described operation flag position is set to 0.
By to described state counter to current C QI
staticthe record of retention time, and then when described state counter reaches the time interval threshold value preset, by described operation flag for resetting, can make over time, making described CQI
staticreenter and can adjust upward state.
In step S205, in order to avoid described channel quality indicated value CQI
staticthere is the situation of table tennis adjustment, at described channel quality indicated value CQI
staticafter downward, set is carried out in operation flag position, by step S208, if to described CQI
staticafter adjusting, the state counter for recording the channel status duration reaches described time interval threshold value, should allow described channel quality indicated value CQI
staticcarry out raising or lowering, so now can reset to described operation flag position.
Described time interval threshold value can set accordingly according to actual treatment situation.
Perform step S209, according to base station requests, by up-to-date described CQI
staticreport base station.
According to base station requests, by up-to-date described CQI
staticreport base station.Base station is this user resource allocation according to the CQI reported, upgrade PDSCH configuration, described PDSCH configuration comprises the transmission mode, code word (CodeWord) quantity, modulation coding mode (MCS, ModulationCodingScheme) etc. of data.
It should be noted that, in the present embodiment, by described channel quality indicated value CQI
staticafter reporting base station, and then can more described channel quality indicated value CQI
staticpDSCH configuration before and after reporting, if configure identical, then possibility base station does not have the described channel quality indicated value CQI that dispatching office reports
static, now can wait for a subframe, then return and perform step S208, continue to wait for that base station upgrades PDSCH configuration; If determine that the PDSCH configuration before and after reporting is not identical more afterwards, then after wait subframe, return and perform step S202, continue to add up the Block Error Rate of channel, continue channel and carry out CQI detection.
The method of measurement of the channel status that the present embodiment provides, can be judged by the situation of change detecting broadband signal to noise ratio corresponding to the subframe in a period of time and each subband signal to noise ratio that whether described channel is the method for static channel, accurately can determine whether present channel is static channel, if be in static channel, then use CQI Measurement Algorithm in this paper, to obtain the CQI value of current static channel the best, if dynamic channel, then use and determine CQI by common methods such as SNR table look-up.
Further, after determining that channel is static channel, because channel circumstance is real-time change, can continue to monitor the situation of change of the broadband signal to noise ratio corresponding to the subframe of described channel and each subband signal to noise ratio, to realize the tracing detection to channel circumstance, can determine that present channel is static channel or dynamic channel in real time, effectively guarantee that the method is applied in static channel environment, improve the accuracy of CQI value.
The method is after described CQI adjusts downwards, and the Block Error Rate recording transmission block in described channel is first less than CQI corresponding to described Block Error Rate threshold value
staticbe the best CQI of the channel obtained by Block Error Rate measurement, because set operation is made in described operation flag position, even if the Block Error Rate recording transmission block is afterwards less than the operation that described Block Error Rate threshold value does not raise described CQI yet, situation about only resetting at described flag bit just does rise operation, the phenomenon using Block Error Rate to measure the adjustment of described CQI table tennis effectively can be avoided like this to occur, after being reported by described best CQI, the maximum throughput efficiency of channel can be obtained.
The method of measurement of corresponding above-mentioned channel status, the embodiment of the present invention also provides a kind of measurement mechanism of channel status, and Fig. 4 is the measurement mechanism structural representation of the channel status that the present embodiment provides.
Described device comprises to be lowered unit U11 and raises unit U12.
Described downward unit U11, for when described channel quality indicated value is greater than the first quality threshold, if the Block Error Rate of described channel is more than or equal to Block Error Rate threshold value, then lowers first threshold by described channel quality indicated value, and by position, operation flag position;
Described rise unit U12, during for resetting in described operation flag position, if the Block Error Rate of described channel is less than described Block Error Rate threshold value and described channel quality indicated value is less than the second quality threshold, then raises Second Threshold by described channel quality indicated value.
Described device also comprises detected value acquiring unit U13 and CQI determining unit U14.
Described detected value acquiring unit U13, for obtaining channel quality detection value, described detected value obtain for the mapping table by searching signal to noise ratio and channel quality indicated value with the channel quality indicated value corresponding to the pilot SNR of described channel;
Described CQI determining unit U14, for after adjusting described channel quality indicated value, if described channel quality indicated value is greater than described detected value and interval threshold and value, then described channel quality indicated value is defined as described detected value and described interval threshold and value; If described channel quality indicated value is less than the difference of described detected value and described interval threshold, then described channel quality indicated value is defined as the difference of described detected value and described interval threshold.
Described device also comprises static channel determining unit U15, for determining that described channel is descending static channel.
Fig. 5 is the structural representation of the static channel determining unit U15 that the present embodiment provides.As shown in Figure 5, described static channel determining unit U15 comprises signal to noise ratio acquiring unit U151, undulating value acquiring unit U152 and determining unit U153.
Signal to noise ratio acquiring unit U151, for obtain described LTE system respectively present sub-frame corresponding to broadband signal to noise ratio and each subband signal to noise ratio;
Undulating value acquiring unit U152, for obtaining the first undulating value and the second undulating value, the difference of the initial value of the broadband signal to noise ratio of described first undulating value corresponding to described present sub-frame and broadband signal to noise ratio is determined, the difference of each initial value of each subband signal to noise ratio of described second undulating value corresponding to present sub-frame and correspondence each subband signal to noise ratio is determined;
Determining unit U153, for being less than or equal to the first fluctuation threshold value at described first undulating value and the second undulating value is less than or equal to the second fluctuation threshold value, adds 1 by the value of the first counter; When the value of described first counter is more than or equal to the first frame number threshold value, determine that described channel is descending static channel.
Described static channel determining unit U15 also comprises the first adjustment unit U154.
Described first adjustment unit U154, for be greater than at described first undulating value described first fluctuation threshold value and described second undulating value be greater than described second fluctuation threshold value at least one condition set up time:
If the value of described first counter is less than frequency threshold value, then the value of described first counter is set to zero; Otherwise the value of described first counter is set to the value of described first counter and the difference of described frequency threshold value.
Described static channel determining unit U15 also comprises updating block U155.
Described updating block U155, for being zero in the value of described first counter, then the initial value of described broadband signal to noise ratio is updated to the broadband signal to noise ratio corresponding to described present sub-frame, each initial value of described each subband signal to noise ratio is updated to each subband signal to noise ratio corresponding to described present sub-frame.
Described device also comprises static channel tracking cell U16, for following the tracks of described static channel.
Fig. 6 is the structural representation of the static channel tracking cell U16 that the present embodiment provides, and as shown in Figure 6, described static channel tracking cell U16 comprises the second adjustment unit U161.
Described second adjustment unit U161, for after determining that described channel is descending static channel, if the first undulating value corresponding to present sub-frame is less than or equal to the first fluctuation threshold value and the second undulating value corresponding to present sub-frame is less than or equal to the second fluctuation threshold value, then the value of the second counter is added 1.
Described static channel tracking cell U16 also comprises the 3rd adjustment unit U162.
Described 3rd adjustment unit U162, follows the tracks of threshold value and the value of described first counter is less than the second frame number threshold value for being greater than or equal in the value of described second counter, then the value of the first counter is added 1.When the value of the second counter as above is more than or equal to tracking threshold value, described two Counter Values is set to 0, after setting to 0 described second counter, continues to follow the tracks of channel circumstance
Described static channel tracking cell U16 also comprises the 4th adjustment unit U163.
Described 4th adjustment unit U163, when setting up for the second undulating value be greater than at the first undulating value described in place corresponding to present sub-frame corresponding to described first fluctuation threshold value and the described present sub-frame at least one condition be greater than in described second fluctuation threshold value: if the value of described first counter is less than described frequency threshold value, then the value of described first counter is set to zero; Otherwise the value of described first counter is set to the value of described first counter and the difference of described frequency threshold value.
Described static channel tracking cell U16 also comprises dynamic channel determining unit U164.
The value that described dynamic channel determining unit U164 is used for described first counter is zero, determines that present channel is descending dynamic channel.
Although the present invention discloses as above, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (26)
1. a method of measurement for channel status, for measuring the channel status of LTE system; It is characterized in that, described channel is descending static channel, and described method comprises:
When described channel quality indicated value is greater than the first quality threshold, if the Block Error Rate of described channel is more than or equal to Block Error Rate threshold value, then described channel quality indicated value is lowered first threshold, and by position, operation flag position;
When resetting in described operation flag position, if the Block Error Rate of described channel is less than described Block Error Rate threshold value and described channel quality indicated value is less than the second quality threshold, then described channel quality indicated value is raised Second Threshold.
2. the method for measurement of channel status as claimed in claim 1, it is characterized in that, the span of described Block Error Rate threshold value is [5%, 15%].
3. the method for measurement of channel status as claimed in claim 1, is characterized in that, also comprise:
Obtain channel quality detection value, described detected value obtain for the mapping table by searching signal to noise ratio and channel quality indicated value with the channel quality indicated value corresponding to the pilot SNR of described channel;
After described channel quality indicated value is adjusted, if described channel quality indicated value be greater than described detected value and interval threshold and value, then described channel quality indicated value is defined as described detected value and described interval threshold and value; If described channel quality indicated value is less than the difference of described detected value and described interval threshold, then described channel quality indicated value is defined as the difference of described detected value and described interval threshold.
4. the method for measurement of channel status as claimed in claim 1, it is characterized in that, the span of described interval threshold is [1,3].
5. the method for measurement of channel status as claimed in claim 1, is characterized in that, also comprise: after adjusting described channel quality indicated value, the value of state counter set to 0.
6. the method for measurement of channel status as claimed in claim 5, is characterized in that, also comprise: every a LTE subframe, the value of described state counter is added 1.
7. the method for measurement of channel status as claimed in claim 6, is characterized in that, also comprise: when the value of described state counter is greater than time interval threshold value, the value of described state counter is set to 0, and is resetted described operation flag position.
8. the method for measurement of channel status as claimed in claim 1, is characterized in that, determine that described channel is descending static channel in the following way:
Obtain the broadband signal to noise ratio corresponding to present sub-frame of described LTE system and each subband signal to noise ratio respectively;
Obtain the first undulating value and the second undulating value, the difference of the initial value of the broadband signal to noise ratio of described first undulating value corresponding to described present sub-frame and broadband signal to noise ratio is determined, the difference of each initial value of each subband signal to noise ratio of described second undulating value corresponding to present sub-frame and correspondence each subband signal to noise ratio is determined;
If described first undulating value is less than or equal to the first fluctuation threshold value and the second undulating value is less than or equal to the second fluctuation threshold value, then the value of the first counter is added 1;
If the value of described first counter is more than or equal to the first frame number threshold value, then determine that described channel is descending static channel.
9. the method for measurement of channel status as claimed in claim 8, it is characterized in that, described second undulating value is determined as follows:
The difference of the signal to noise ratio initial value of each subband signal to noise ratio and each subband of correspondence is sorted according to order from big to small;
Using the mean value of a front M difference as described second undulating value.
10. the method for measurement of channel status as claimed in claim 9, is characterized in that, the value of described M is determined based on the degree of fluctuation of the measurement result of the signal-to-noise ratio (SNR) Algorithm corresponding to the number of sub-bands of described LTE system and described subband.
The method of measurement of 11. channel statuss as claimed in claim 8, is characterized in that, also comprise:
When described first undulating value is greater than described first fluctuation threshold value and the described second undulating value at least one condition be greater than in described second fluctuation threshold value sets up:
If the value of described first counter is less than frequency threshold value, then the value of described first counter is set to zero; Otherwise the value of described first counter is set to the value of described first counter and the difference of described frequency threshold value.
The method of measurement of 12. channel statuss as claimed in claim 11, is characterized in that, also comprise:
If the value of described first counter is zero, then the initial value of described broadband signal to noise ratio is updated to the broadband signal to noise ratio corresponding to described present sub-frame, each initial value of described each subband signal to noise ratio is updated to each subband signal to noise ratio corresponding to described present sub-frame.
The method of measurement of 13. channel statuss as claimed in claim 8, is characterized in that, also comprise:
After determining that described channel is descending static channel, if the first undulating value corresponding to present sub-frame is less than or equal to the first fluctuation threshold value and the second undulating value corresponding to present sub-frame is less than or equal to the second fluctuation threshold value, then the value of the second counter is added 1.
The method of measurement of 14. channel statuss as claimed in claim 13, is characterized in that, also comprise:
If the value of described second counter is greater than or equal to tracking threshold value and the value of described first counter is less than the second frame number threshold value, then the value of the first counter is added 1.
The method of measurement of 15. channel statuss as claimed in claim 14, is characterized in that, also comprise:
When the second undulating value be greater than corresponding to described first fluctuation threshold value and described present sub-frame of the first undulating value corresponding to the described present sub-frame at least one condition be greater than in described second fluctuation threshold value is set up:
If the value of described first counter is less than described frequency threshold value, then the value of described first counter is set to zero; Otherwise the value of described first counter is set to the value of described first counter and the difference of described frequency threshold value.
The method of measurement of 16. channel statuss as claimed in claim 15, is characterized in that, also comprise:
If the value of described first counter is zero, then determine that present channel is descending dynamic channel.
The method of measurement of 17. channel statuss as claimed in claim 16, it is characterized in that, also comprise: the initial value of described broadband signal to noise ratio is updated to the broadband signal to noise ratio corresponding to described present sub-frame, each initial value of described each subband signal to noise ratio is updated to each subband signal to noise ratio corresponding to described present sub-frame.
The measurement mechanism of 18. 1 kinds of channel statuss, for measuring the channel status of LTE system; It is characterized in that, described channel is descending static channel, and described device comprises:
Lower unit, for when described channel quality indicated value is greater than the first quality threshold, if the Block Error Rate of described channel is more than or equal to Block Error Rate threshold value, then described channel quality indicated value is lowered first threshold, and by position, operation flag position;
Raising unit, during for resetting in described operation flag position, if the Block Error Rate of described channel is less than described Block Error Rate threshold value and described channel quality indicated value is less than the second quality threshold, then described channel quality indicated value being raised Second Threshold.
The measurement mechanism of 19. channel statuss as claimed in claim 18, is characterized in that, also comprise:
Detected value acquiring unit, for obtaining channel quality detection value, described detected value obtain for the mapping table by searching signal to noise ratio and channel quality indicated value with the channel quality indicated value corresponding to the pilot SNR of described channel;
Determining unit, for after adjusting described channel quality indicated value, if described channel quality indicated value be greater than described detected value and interval threshold and value, then described channel quality indicated value is defined as described detected value and described interval threshold and value; If described channel quality indicated value is less than the difference of described detected value and described interval threshold, then described channel quality indicated value is defined as the difference of described detected value and described interval threshold.
The measurement mechanism of 20. channel statuss as claimed in claim 18, is characterized in that, also comprise: static channel determining unit, and for determining that described channel is descending static channel, described static channel determining unit comprises:
Signal to noise ratio acquiring unit, for obtain described LTE system respectively present sub-frame corresponding to broadband signal to noise ratio and each subband signal to noise ratio;
Undulating value acquiring unit, for obtaining the first undulating value and the second undulating value, the difference of the initial value of the broadband signal to noise ratio of described first undulating value corresponding to described present sub-frame and broadband signal to noise ratio is determined, the difference of each initial value of each subband signal to noise ratio of described second undulating value corresponding to present sub-frame and correspondence each subband signal to noise ratio is determined;
CQI determining unit, for being less than or equal to the first fluctuation threshold value at described first undulating value and the second undulating value is less than or equal to the second fluctuation threshold value, adds 1 by the value of the first counter; When the value of described first counter is more than or equal to the first frame number threshold value, determine that described channel is descending static channel.
The measurement mechanism of 21. channel statuss as claimed in claim 20, it is characterized in that, described static channel determining unit also comprises: the first adjustment unit, for be greater than at described first undulating value described first fluctuation threshold value and described second undulating value be greater than described second fluctuation threshold value at least one condition set up time:
If the value of described first counter is less than frequency threshold value, then the value of described first counter is set to zero; Otherwise the value of described first counter is set to the value of described first counter and the difference of described frequency threshold value.
The measurement mechanism of 22. channel statuss as claimed in claim 21, it is characterized in that, described static channel determining unit also comprises: updating block, for being zero in the value of described first counter, then the initial value of described broadband signal to noise ratio is updated to the broadband signal to noise ratio corresponding to described present sub-frame, each initial value of described each subband signal to noise ratio is updated to each subband signal to noise ratio corresponding to described present sub-frame.
The measurement mechanism of 23. channel statuss as claimed in claim 20, is characterized in that, also comprise: static channel tracking cell, for following the tracks of described static channel; Described tracking cell comprises: the second adjustment unit, for after determining that described channel is descending static channel, if the first undulating value corresponding to present sub-frame is less than or equal to the first fluctuation threshold value and the second undulating value corresponding to present sub-frame is less than or equal to the second fluctuation threshold value, then the value of the second counter is added 1.
The measurement mechanism of 24. channel statuss as claimed in claim 23, it is characterized in that, described static channel tracking cell also comprises: the 3rd adjustment unit, follow the tracks of threshold value and the value of described first counter is less than the second frame number threshold value for being greater than or equal in the value of described second counter, then the value of the first counter is added 1.
The measurement mechanism of 25. channel statuss as claimed in claim 24, it is characterized in that, described static channel tracking cell also comprises: the 4th adjustment unit, when setting up for the second undulating value be greater than at the first undulating value described in place corresponding to present sub-frame corresponding to described first fluctuation threshold value and the described present sub-frame at least one condition be greater than in described second fluctuation threshold value: if the value of described first counter is less than described frequency threshold value, then the value of described first counter is set to zero; Otherwise the value of described first counter is set to the value of described first counter and the difference of described frequency threshold value.
The measurement mechanism of 26. channel statuss as claimed in claim 25, it is characterized in that, described static channel tracking cell also comprises: dynamic channel determining unit, and the value for described first counter is zero, determines that present channel is descending dynamic channel.
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