CN104283633A - Method for adjusting MCS threshold - Google Patents
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Abstract
The invention discloses a method for adjusting an MCS threshold. The method comprises the steps that wait time Restrict_time is set in advance; a base station monitors ACK/NACK detection results transmitted on an uplink of UE so as to count the BLER within the statistical time under the current MCS threshold; up-regulation or down-regulation of the MCS threshold is triggered according to the magnitude of the BLER within the counting time and the set Restrict_time. According to the method for adjusting the MCS threshold, due to the fact that the wait time Restrict_time for down-regulation of the MCS threshold is prolonged, the time for down-regulation of the MCS threshold from a higher order to a lower order is prolonged appropriately according to setting of the Restrict_time, therefore, frequency adjustment of the MCS threshold between the higher order and the lower order can be effectively avoided, the jitter variance of the BLER can be controlled, jitter of MCS selection is reduced, the BLER, the MCS and the throughput capacity of a cell can all be maintained in a stable state, and the authorization expense of a DCI is reduced.
Description
Technical field
The present invention relates to communication technical field, particularly one adjustment MCS(Modulation and Coding Scheme, modulation coding mode) method of threshold value.
Background technology
Current, in mobile communication system, during the demand of high speed data transmission service is in always and constantly increases.Base station, in order to transmit ascending data faster and more accurately, needs to select up MCS(Modulation and Coding Scheme adaptively, modulation coding mode).The transmission performance of MCS along with SINR(Signal to Interference plus Noise Ratio, Signal to Interference plus Noise Ratio) difference and different, in existing communication system, often choose the demodulation threshold of corresponding SINR as MCS using the Block Error Rate of 10% for criterion.Base station measures the SINR of up channel in real time, selects the MCS that demodulation threshold mates with present channel quality.
In prior art, base station provides the MCS-SINR mapping table under specific channel model in advance by link level simulation, and it is the demodulation threshold of 10% that often kind of MCS corresponds to target Block Error Rate.In patent CN200410065847.4, propose a kind of MCS system of selection, the method measures SINR in real time, for the SINR dropped in given range, according to the CRC(Cyclical Redundancy Check of transmission packet, cyclic redundancy check (CRC)) correctness, lower by step-length or raise the MCS threshold value preset.Wherein, 1) for meeting target Block Error Rate requirement (being usually set to 10%), step-length/rise step-length=1/9 is lowered; 2) be the channel circumstance of Adaptive change, raise step-length real-time variable.
As mentioned above, in prior art, base station provides MCS-SINR mapping table under specific channel model in advance by link level simulation, often kind of MCS corresponds to the SINR threshold value that target Block Error Rate is 10%, and for different location, not in the same time, also different to the demand of the demodulation ability of MCS under different fading environment and multi-path environment, thus changeless threshold value cannot the change of adaptive channel environment.And the method proposed in patent CN200410065847.4, CRC(cyclic redundancy check (CRC) according to transmission packet) adjust SINR threshold value in real time, although to a certain extent can the change of adaptive channel environment, but when measure in SINR a period of time constant and just at SINR Near Threshold time, the CRC result of single transmission probably repeatedly changes between right and wrong, SINR threshold value also adjusts thereupon up and down, there will be MCS and constantly changes between upper and lower two rank MCS.The shake of this MCS not only brings the growth of authorizing expense, also causes the instability of throughput.
Summary of the invention
In view of this, the invention provides a kind of method adjusting MCS threshold value, with the change of adaptive channel environment, also avoid the frequent shake that MCS selects, and then protection MCS demodulation threshold is stable.
Technical scheme of the present invention is achieved in that
Adjust a method for MCS threshold value, comprising:
Pre-set stand-by period Restrict_time;
The ACK/NACK testing result of base station Real-Time Monitoring UE uplink, with the BLER in the timing statistics of statistics under current MCS threshold value, trigger rise or the downward of described current MCS threshold value according to the size of the BLER in described timing statistics and set Restrict_time.
Further, described BLER is arranged separately for each UE, and for the transfer of data in the MCS threshold value of every rank, described BLER adds up separately.
Further, the BLER timing statistics triggering described current MCS threshold value downward is more than or equal to the BLER timing statistics triggering described current MCS threshold value and raise.
Further, the condition triggering described current MCS threshold value rise is:
BLER in the first timing statistics is greater than MAX-bler, then trigger the rise of described current MCS threshold value;
The condition triggering described current MCS threshold value downward is:
BLER in the second timing statistics is less than MIN-bler, and the Restrict_time set by arriving, then trigger the downward of described current MCS threshold value, otherwise do not trigger the downward of described current MCS threshold value;
Wherein, MAX-bler is default maximum Block Error Rate, and MIN-bler is default minimum Block Error Rate.
Further, start timing completing the time point described current MCS threshold value being adjusted to higher order MCS threshold value, when after the Restrict_time set by arriving, then determine whether according to the size of described BLER the downward triggering described high-order MCS threshold value.
Further, described second timing statistics is greater than the first timing statistics.
Further, under the i-th rank MCS threshold value, after described MCS threshold value rise is triggered, Up_step and SINR_MINi+ Δ is compared, to select the upper tone pitch of the maximum in Up_step and SINR_MINi+ Δ as the i-th rank MCS threshold value;
Described i-th rank MCS threshold value is added with described upper tone pitch obtained with value as the i-th+1 rank MCS threshold value;
The i-th+1 rank MCS threshold value is adjusted to by the i-th rank MCS threshold value, and time point SFNi+1 when record being adjusted to the i-th+1 rank MCS threshold value; Wherein:
Described Up_step is the rise step-length of the MCS threshold value preset; SINR_MINi is fed back to SINR value minimum in the SINR value that the physical layer corresponding to the result of NACK reports for all Physical Uplink Shared Channel PUSCH in the first timing statistics in the i-th rank MCS threshold value; Δ is the deviant preset; I represents the exponent number of MCS, and the i-th+1 rank MCS threshold value represents the MCS threshold value than the i-th rank MCS threshold value higher order, and i is positive integer.
Further, under the i-th+1 rank MCS threshold value, when the BLER in described second timing statistics is less than MIN-bler, judge whether current time is more than or equal to Restrict_time with the time difference of the time point SFNi+1 recorded when being above adjusted to the i-th+1 rank MCS threshold value, if, then trigger the downward of described MCS threshold value, otherwise do not trigger the downward of described MCS threshold value;
After described MCS threshold value downward is triggered, described i-th+1 rank MCS threshold value and Down_step are subtracted each other obtained difference as the i-th rank MCS threshold value, to be adjusted to the i-th rank MCS threshold value by under the i-th+1 rank MCS threshold value; Wherein, described Down_step is the downward step-length of the MCS threshold value preset.
As can be seen from such scheme, the method of adjustment MCS threshold value of the present invention is owing to adding the stand-by period Restrict_time for timing under MCS threshold value, and then the time can lowered to low single order (i.e. the i-th rank MCS threshold value) by higher order (i.e. the i-th+1 rank MCS threshold value) according to the setting proper extension MCS threshold value of this Restrict_time, and then can effectively prevent MCS threshold value from adjusting frequently between upper and lower two rank, with the shake variance of control BLER, reduce the jitter that MCS selects, make BLER, the throughput of MCS and community can both maintain a stable state, and reduce DCI(Downlink Control Information, Downlink Control Information) mandate expense.
Accompanying drawing explanation
Fig. 1 is the schematic diagram triggering the rise of MCS threshold value in method of the present invention or lower;
Fig. 2 is the embodiment flow chart of method of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, to develop simultaneously embodiment referring to accompanying drawing, the present invention is described in further detail.
The method of adjustment MCS threshold value of the present invention mainly comprises:
Pre-set stand-by period Restrict_time;
Base station Real-Time Monitoring UE(user) ACK/NACK(of uplink confirm/do not confirm) testing result, with the BLER in the timing statistics of statistics under current MCS threshold value, trigger rise or the downward of described current MCS threshold value according to the size of the BLER in described timing statistics and set Restrict_time.
Wherein, described BLER is arranged separately for each UE, and for the transfer of data in the MCS threshold value of every rank, described BLER adds up separately, can set for every rank MCS threshold value of each UE particularly separately like this.
In the present invention, the condition triggering described current MCS threshold value rise is:
BLER in the first timing statistics is greater than MAX-bler, then trigger the rise of described current MCS threshold value.
The condition triggering described current MCS threshold value downward is:
BLER in the second timing statistics is less than MIN-bler, and the Restrict_time set by arriving, then trigger the downward of described current MCS threshold value, otherwise do not trigger the downward of described current MCS threshold value.
Wherein, MAX-bler is default maximum Block Error Rate, and MIN-bler is default minimum Block Error Rate.
From above-mentioned introduction, in the present invention, the triggering that current MCS threshold value raises only according to the size of the BLER in described timing statistics, not based on set Restrict_time; And the triggering that current MCS threshold value is lowered needs simultaneously according to size and the set Restrict_time of the BLER in described timing statistics.
Wherein, the triggering application of Restrict_time is specially: start timing completing the time point described current MCS threshold value being adjusted to higher order MCS threshold value, when after the Restrict_time set by arriving, then determine whether according to the size of described BLER the downward triggering described high-order MCS threshold value.
In the present invention, the BLER timing statistics triggering described current MCS threshold value downward is more than or equal to the BLER timing statistics triggering described current MCS threshold value and raise, and namely the second timing statistics is greater than the first timing statistics.
Below in conjunction with specific embodiment, said method of the present invention is described in detail.
As shown in Figure 1, the MCS that base station uses is set and has n rank, n be more than or equal to 1 positive integer, i is the positive integer from 1 to n, i represents the exponent number of MCS, i-th+1 rank MCS threshold value represents the MCS threshold value than the i-th rank MCS threshold value higher order, for the adjustment of MCS threshold value, pre-sets a stand-by period Restrict_time.
Please refer to shown in Fig. 1, suppose that current MCS threshold value is the i-th rank MCS threshold value, under current MCS, namely under the i-th rank MCS, the ACK/NACK(of base station Real-Time Monitoring UE uplink confirm/does not confirm) testing result, to count the BLER in the timing statistics under the i-th rank MCS threshold value, trigger rise or the downward of the i-th rank MCS threshold value according to the size of the BLER in described timing statistics and set Restrict_time.
According to the condition that the current MCS threshold value of above-mentioned triggering raises, under the i-th rank MCS, the ACK/NACK testing result of base station Real-Time Monitoring UE uplink, to obtain the BLER in the first timing statistics, judge the BLER in described first timing statistics, if the BLER in the first timing statistics is greater than MAX-bler, then trigger the rise of the i-th rank MCS threshold value, to be adjusted to the i-th+1 rank MCS threshold value by the i-th rank MCS threshold value.On when being adjusted to the i-th+1 rank MCS threshold value, time point SFN when being adjusted to the i-th+1 rank MCS threshold value need be recorded
i+1, so that timing is to the judgement of Restrict_time under carrying out MCS threshold value.
After the rise of MCS threshold value is triggered, the rise of MCS threshold value is carried out according to following method:
Up_step and SINR_MINi+ Δ is compared, to select the upper tone pitch of the maximum in Up_step and SINR_MINi+ Δ as the i-th rank MCS threshold value;
Described i-th rank MCS threshold value is added with described upper tone pitch obtained with value as the i-th+1 rank MCS threshold value;
The i-th+1 rank MCS threshold value is adjusted to by the i-th rank MCS threshold value, and time point SFN when record being adjusted to the i-th+1 rank MCS threshold value
i+1.
Wherein, Up_step is the rise step-length of the MCS threshold value preset, SINR_MINi is all PUSCH(Physical Uplink Shared Channel in the first timing statistics in the i-th rank MCS threshold value, Physical Uplink Shared Channel) SINR value minimum in the SINR value that reports of the physical layer corresponding to result that is fed back to NACK, Δ is the deviant preset.
Continue with reference to shown in Fig. 1, suppose that current MCS threshold value is the i-th+1 rank MCS threshold value, under current MCS, namely under the i-th+1 rank MCS, the ACK/NACK testing result of base station Real-Time Monitoring UE uplink, to count the BLER in the timing statistics under the i-th+1 rank MCS threshold value, trigger rise or the downward of the i-th+1 rank MCS threshold value according to the size of the BLER in described timing statistics and set Restrict_time.
According to the condition that the current MCS threshold value of above-mentioned triggering is lowered, under the i-th+1 rank MCS, the ACK/NACK testing result of base station Real-Time Monitoring UE uplink, to obtain the BLER in the second timing statistics, judge the BLER in described second timing statistics, and judge current time and the time point SFN recorded when being above adjusted to the i-th+1 rank MCS threshold value
i+1time difference whether be more than or equal to Restrict_time, if the BLER in the second timing statistics is less than MIN-bler and current time and time point SFN
i+1time difference be more than or equal to Restrict_time, then trigger the downward of the i-th+1 rank MCS threshold value, to be adjusted to the i-th rank MCS threshold value by under the i-th+1 rank MCS threshold value, otherwise do not trigger the downward of the i-th+1 rank MCS threshold value.Under when being adjusted to the i-th rank MCS threshold value, also need to record time point SFN when being adjusted to the i-th rank MCS threshold value
i, so that carry out subsequently under MCS threshold value timing to the judgement of Restrict_time.
After the downward of MCS threshold value is triggered, the downward of MCS threshold value is carried out according to following method:
I-th+1 rank MCS threshold value and Down_step are subtracted each other obtained difference as the i-th rank MCS threshold value, to be adjusted to the i-th rank MCS threshold value by under the i-th+1 rank MCS threshold value.Wherein, Down_step is the downward step-length of the MCS threshold value preset.
No matter be raise MCS threshold value or lower MCS threshold value, whenever once raising or downward operates to be new MCS threshold value by original MCS adjusting thresholds, all need to record the time point adjusting to new MCS threshold value, this whether is more than or equal to Restrict_time at time difference of time point in order to record when can judge current time and adjust to new MCS threshold value under new MCS threshold value, and then under new MCS threshold value, judge whether the downward that needs to carry out MCS threshold value.
In said method, the parameter such as the first timing statistics, the second timing statistics, MAX-bler, MIN-bler, Restrict_time, Up_step, SINR_MINi, Δ, Down_step can be arranged according to cellular communication situation and actual needs.Such as, first timing statistics can be set to 100 unlimited frames (radio-frame time is variable for different system), second timing statistics can be set to 300 radio frames, MAX-bler can be set to [0.01,0.1], MIN-bler can be set to [0,0.01], Restrict_time can be arranged in 20 minutes to 2 hours intervals, Up_step can be set to [0,1] dB, SINR_MINi can be set to 100dB, Δ can be set to 0.005dB, Down_step can be set to [0,0.5] dB.
Fig. 2 is the embodiment schematic flow sheet of method of the present invention.Shown in Fig. 1 and Fig. 2, method of the present invention is described as follows again.Mainly comprise the steps in embodiment illustrated in fig. 2.
Step 1, parameters, comprise the parameter such as the first timing statistics, the second timing statistics, MAX-bler, MIN-bler, Restrict_time, Up_step, SINR_MINi, Δ, Down_step, performs step 2 afterwards.
The ACK/NACK testing result of step 2, Real-Time Monitoring UE uplink, to add up the BLER under current MCS threshold value in timing statistics, performs step 3 afterwards.
With reference to shown in Fig. 1, if current MCS threshold value is the i-th rank MCS threshold value, then add up the BLER in timing statistics under the i-th rank MCS threshold value in step 2; If current MCS threshold value is the i-th+1 rank MCS threshold value, then the BLER in step 2 under statistics the i-th+1 rank MCS threshold value in timing statistics.
Step 3, judge whether the BLER added up in the first timing statistics is greater than set MAX-bler, if it is perform step 4, otherwise perform step 5.
With reference to shown in Fig. 1, this step 3 whether meets rise trigger condition for current MCS threshold value and arranges.
Step 4, rise MCS threshold value, and record raises the time point of MCS threshold value to obtain the duration, performs step 2 afterwards.
With reference to shown in Fig. 1, if current MCS threshold value is the i-th rank MCS threshold value, then in step 4, after raising MCS threshold value, i-th rank MCS threshold value then becomes the i-th+1 rank MCS threshold value, when performing step 2 afterwards, current MCS threshold value then becomes the i-th+1 rank MCS threshold value, and the time point of the rise MCS threshold value simultaneously recorded in step 4 is SFN
i+1.
In this step 4, further comprises the concrete rise process to MCS threshold value:
Up_step and SINR_MINi+ Δ is compared, to select the upper tone pitch of the maximum in Up_step and SINR_MINi+ Δ as current MCS threshold value (such as the i-th rank threshold value);
Current MCS threshold value (such as the i-th rank MCS threshold value) is added with described upper tone pitch obtained with value as the MCS threshold value (such as the i-th+1 rank MCS threshold value) after new rise;
The MCS threshold value after new rise (such as the i-th+1 rank MCS threshold value) is adjusted to by current MCS threshold value (such as the i-th rank MCS threshold value), and time point (such as SFN when record being adjusted to MCS threshold value (such as the i-th+1 rank MCS threshold value) after new rise
i+1).
Step 5, judge whether the BLER added up in the second timing statistics is less than set MIN-bler, and whether the duration arrives Restrict_time, if the BLER added up is less than set MIN-bler and the duration arrives Restrict_time, then perform step 6, otherwise perform step 7.
With reference to shown in Fig. 1, this step 5 whether meets downward trigger condition for current MCS threshold value and arranges.Wherein, the duration is from raising (or lower) to current MCS threshold value, carry out the time that timing obtains, and is also current time and time point (the such as SFN that records when being adjusted to current MCS threshold value (such as the i-th+1 rank MCS threshold value)
i+1) time difference.
Step 6, downward MCS threshold value, and record lowers the time point of MCS threshold value to obtain the duration, performs step 2 afterwards.
With reference to shown in Fig. 1, if current MCS threshold value is the i-th+1 rank MCS threshold value, then in step 6, after lowering MCS threshold value, i-th+1 rank MCS threshold value then becomes the i-th rank MCS threshold value, when performing step 2 afterwards, current MCS threshold value then becomes the i-th rank MCS threshold value, and the time point of the downward MCS threshold value simultaneously recorded in step 6 is SFN
i.
In this step 6, further comprises the concrete downward process to MCS threshold value:
Current MCS threshold value (such as the i-th+1 rank MCS threshold value) and Down_step are subtracted each other obtained difference as the MCS threshold value (such as the i-th rank MCS threshold value) after lowering, to be adjusted to the MCS threshold value after downward (such as the i-th rank MCS threshold value) by under current MCS threshold value (such as the i-th+1 rank MCS threshold value).And time point (such as SFN when recording the MCS threshold value after being adjusted to new downward (such as the i-th rank MCS threshold value)
i), to carry out the judgement of duration under the MCS threshold value subsequently after downward (such as the i-th rank MCS threshold value).
Step 7, keep current MCS threshold value constant, and perform step 1.
With reference to shown in Fig. 1, if current MCS threshold value is the i-th rank MCS threshold value, then keep the i-th rank MCS threshold value constant in this step 7; If current MCS threshold value is the i-th+1 rank MCS threshold value, then keep the i-th+1 rank MCS threshold value constant in this step 7.
By each step cycle of above-described embodiment, the automatic adjustment to MCS threshold value can be realized.
The method of adjustment MCS threshold value of the present invention is owing to adding the stand-by period Restrict_time for timing under MCS threshold value, and then the time can lowered to low single order (as the i-th rank MCS threshold value) by higher order (as the i-th+1 rank MCS threshold value) according to the setting proper extension MCS threshold value of this Restrict_time, can effectively prevent MCS threshold value from adjusting frequently between upper and lower two rank, with the shake variance of control BLER, reduce the jitter that MCS selects, make BLER, the throughput of MCS and community can both maintain a stable state, and reduce the mandate expense of DCI.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (8)
1. adjust a method for MCS threshold value, comprising:
Pre-set stand-by period Restrict_time;
The ACK/NACK testing result of base station Real-Time Monitoring UE uplink, with the BLER in the timing statistics of statistics under current MCS threshold value, trigger rise or the downward of described current MCS threshold value according to the size of the BLER in described timing statistics and set Restrict_time.
2. method according to claim 1, is characterized in that: described BLER is arranged separately for each UE, and for the transfer of data in the MCS threshold value of every rank, described BLER adds up separately.
3. method according to claim 1, is characterized in that: the BLER timing statistics triggering described current MCS threshold value downward is more than or equal to the BLER timing statistics triggering described current MCS threshold value and raise.
4. method according to claim 1, is characterized in that:
The condition triggering described current MCS threshold value rise is:
BLER in the first timing statistics is greater than MAX-bler, then trigger the rise of described current MCS threshold value;
The condition triggering described current MCS threshold value downward is:
BLER in the second timing statistics is less than MIN-bler, and the Restrict_time set by arriving, then trigger the downward of described current MCS threshold value, otherwise do not trigger the downward of described current MCS threshold value;
Wherein, MAX-bler is default maximum Block Error Rate, and MIN-bler is default minimum Block Error Rate.
5. the method according to any one of claims 1 to 3, it is characterized in that: start timing completing the time point described current MCS threshold value being adjusted to higher order MCS threshold value, when after the Restrict_time set by arriving, then determine whether according to the size of described BLER the downward triggering described high-order MCS threshold value.
6. method according to claim 4, is characterized in that: described second timing statistics is greater than the first timing statistics.
7. method according to claim 4, is characterized in that:
Under the i-th rank MCS threshold value, after described MCS threshold value rise is triggered, Up_step and SINR_MINi+ Δ is compared, to select the upper tone pitch of the maximum in Up_step and SINR_MINi+ Δ as the i-th rank MCS threshold value;
Described i-th rank MCS threshold value is added with described upper tone pitch obtained with value as the i-th+1 rank MCS threshold value;
The i-th+1 rank MCS threshold value is adjusted to by the i-th rank MCS threshold value, and time point SFN when record being adjusted to the i-th+1 rank MCS threshold value
i+1; Wherein:
Described Up_step is the rise step-length of the MCS threshold value preset; SINR_MINi is fed back to SINR value minimum in the SINR value that the physical layer corresponding to the result of NACK reports for all Physical Uplink Shared Channel PUSCH in the first timing statistics in the i-th rank MCS threshold value; Δ is the deviant preset; I represents the exponent number of MCS, and the i-th+1 rank MCS threshold value represents the MCS threshold value than the i-th rank MCS threshold value higher order, and i is positive integer.
8. method according to claim 7, is characterized in that:
Under the i-th+1 rank MCS threshold value, when the BLER in described second timing statistics is less than MIN-bler, judge current time and the time point SFN recorded when being above adjusted to the i-th+1 rank MCS threshold value
i+1time difference whether be more than or equal to Restrict_time, if so, then trigger the downward of described MCS threshold value, otherwise do not trigger the downward of described MCS threshold value;
After described MCS threshold value downward is triggered, described i-th+1 rank MCS threshold value and Down_step are subtracted each other obtained difference as the i-th rank MCS threshold value, to be adjusted to the i-th rank MCS threshold value by under the i-th+1 rank MCS threshold value; Wherein, described Down_step is the downward step-length of the MCS threshold value preset.
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