CN102547835A - Counting method for interference signal code power - Google Patents

Abstract

The invention provides a counting method for interference signal code power (ISCP). The method comprises the following steps of: equally dividing a reporting cycle into m sub-cycles, and presetting a power threshold value T and a threshold value M; accumulating ISCP values of each sub-frame in each sub-cycle, wherein the ISCP values of the former M sub-frames of which the ISCP values are greater than T are accumulated into an accumulated value according to the value of T; at the end of each sub-cycle, calculating an ISCP arithmetic mean of each sub-cycle according to the obtained accumulated value; in the same reporting cycle, converting the ISCP arithmetic mean of each sub-cycle into a dB value, and at the end of each sub-cycle, obtaining an average ISCP dB value at the end of a current sub-cycle according to the dB value of the ISCP arithmetic mean of each of the current sub-cycle and sub-cycles before the current sub-cycle; and at the end of the reporting cycle, reporting an average ISCP dB value at the end of the last sub-cycle of the reporting cycle to a radio network controller (RNC) as an average ISCP dB value of the reporting cycle. By the method, the influence of high-power burst interference on a counting result can be effectively reduced or avoided.

Description

A kind of statistical method of Interference Signal Code Power

Technical field

The present invention relates to communication technical field, refer in particular to a kind of statistical method of Interference Signal Code Power.

Background technology

In TD SDMA (TD-SCDMA) communication system; Base station (NodeB) needs the Interference Signal Code Power (ISCP) of statistics ascending pilot frequency (UpPTS) time slot; And statistics periodically reported radio network controller (RNC), carry out the corresponding radio resource management by RNC according to the size of noise then.In practical situations, system tends to receive high-power bursty interference artificial or nature, and these interference often are instantaneous generation, and influence the access of one, two sub-frame, but generally can not produce obviously influence to inserting success rate at random.But; Owing to generally all be to use the linear domain recursive algorithm to come statistical average ISCP in the prior art, therefore in the moment that is interfered, not only the value of average ISCP can significantly increase; But also can produce serious smearing; The feasible value that reports the average ISCP of RNC remains high in a long time, thereby causes RNC to do the judgement that makes mistake easily, carries out unnecessary Radio Resource adjustment.

Therefore, need a kind of size that can correctly reflect the interference that The Long-term Effect is professional, can correctly reflect the ISCP statistical method of high-power bursty interference again the influence of business.For the professional interference of The Long-term Effect, its characteristics are that the duration long enough of this kind interference or frequency are enough high, therefore, can intuitively reflect the influence degree of above-mentioned interference to business through the average ISCP value of disturbing; And for high-power bursty interference; Because NodeB receives the exemplary power that subscriber equipment (UE) inserts signal for the first time and be generally-95dBm, and when interference intensity during greater than-85dBm, the access success rate of UE will be lower than 10%; Therefore; As long as the intensity of suffered bursty interference during greater than-85dBm, just can be thought and can't insert in the subframe of this bursty interference between the emergence period, will produce indiscriminate influence to business.This bursty interference is frequent more, causes the subframe that can't insert just many more, and it is just more little to insert success rate.Therefore, the average power of above-mentioned bursty interference can not reflect fully that the frequency of above-mentioned bursty interference then more can reflect the influence degree to business to the professional influence degree of this interference this moment.Hence one can see that, need take all factors into consideration the characteristic of above-mentioned two kinds of interference in the statistical method of ISCP, thereby obtain reflecting preferably the tolerance of the average ISCP form of access service degree of susceptibility.

At present, employed ISCP statistical method has three kinds in the prior art: the combination of cycle arithmetic average method, dB territory recurrence averaging method and above-mentioned two kinds of methods.

Wherein, above-mentioned cycle arithmetic average method is in report cycle all instantaneous ISCP values is done sums on average, and with this mean value as the ISCP value that reports RNC.Use this method can the influence of bursty interference be confined in the report cycle.But if bursty interference is to take place in the cycle with above-mentioned report cycle, then the value of above-mentioned average ISCP can't reflect real disturbed condition; And this algorithm can only reflect the average ISCP when report cycle finishes, and can't obtain each average ISCP constantly.

And above-mentioned dB territory recurrence averaging method then is to convert instantaneous ISCP to decibel to bring the formula (1) that is described below again into after (dB) value and carry out the average calculating of dB territory recurrence, thereby obtains the value of the average ISCP on the dB territory, i.e. the average dB value of ISCP:

${\stackrel{\‾}{\mathrm{\σ}}}^2\left(m\right)=(1-p)\·{\stackrel{\‾}{\mathrm{\σ}}}^2(m-1)+p\·{\mathrm{\σ}}^2\left(m\right)---\left(1\right)$

Wherein, m is the sequence number of frame; P is the recurrence factor, and its span is 0＜p≤1;

Average ISCP when being the m frame end, σ ²(m) be instantaneous ISCP in the m frame.

Above-mentioned dB territory recurrence averaging method is to rise soon slowly to fall to the reaction that statistic changes, and therefore can obviously reduce smearing, and is also comparatively slow to the reflection of noise rise.But, in the method,, and also needing in this method frequently to convert linear value to the dB value because decay is too fast thereby can't reflect the interference that measurement period is preceding half section, computing cost is bigger.

The method of above-mentioned two kinds of method be combined intos can be described as mixed method; In this mixed method, report cycle is divided into the plurality of sub cycle, in each subcycle; NodeB carries out arithmetic average to the ISCP of the UpPTS time slot of all subframes in this subcycle; It is average then the arithmetic mean of each sub-cycles to be carried out dB territory recurrence, when each report cycle finishes, the dB territory recurrence of this moment is on average reported RNC.The advantage that this mixed method can be inherited above-mentioned two kinds of methods can overcome the shortcoming of above-mentioned two kinds of methods again preferably, is more satisfactory solution.But this mixed method still can't correctly reflect and occur in the influence of high-power bursty interference some special occasion or that the cycle is less to business, for example; When the power of certain bursty interference very big; And in the time of in the subcycle when occurring in the report cycle end accidentally, this bursty interference will produce very big influence to the result who reports RNC, thereby can't reflect actual disturbed condition; Still will cause RNC to do the judgement that makes mistake, carry out unnecessary Radio Resource adjustment.

Summary of the invention

The invention provides a kind of statistical method of Interference Signal Code Power, thereby can effectively reduce or avoid of the influence of high-power bursty interference statistics.

For achieving the above object, the technical scheme among the present invention is achieved in that

A kind of statistical method of Interference Signal Code Power, this method comprises:

Report cycle is divided into the m sub-cycles, and power threshold T and threshold value M are set in advance;

In each subcycle, the value of the Interference Signal Code Power ISCP of each sub-frame added up obtains the ISCP accumulated value, and wherein, for the subframe of preceding M ISCP value greater than T, the value of its ISCP counts the ISCP accumulated value according to the value of T; When each sub-cycles finishes, calculate the ISCP arithmetic mean of each sub-cycles according to the ISCP accumulated value of each sub-cycles;

In same report cycle; Convert the ISCP arithmetic mean of instantaneous value of each sub-cycles to ISCP arithmetic average dB value; And when each subcycle finishes, the dB value of the average ISCP when obtaining current subcycle end based on the ISCP arithmetic average dB value of current subcycle and each sub-cycles before thereof;

When report cycle finished, the dB value of the average ISCP when last subcycle in the said report cycle is finished reported RNC as the dB value of the average ISCP of report cycle.

The ISCP arithmetic mean that said ISCP accumulated value according to each sub-cycles calculates each sub-cycles comprises:

With the ISCP accumulated value of each sub-cycles divided by the number of sub frames in the subcycle, thereby obtain the ISCP arithmetic mean of each sub-cycles.

The formula of the dB value of the average ISCP when calculating current subcycle and finishing is:

${\stackrel{\‾}{\mathrm{\σ}}}_0^2\left(n\right)=(1-p_0)\·{\stackrel{\‾}{\mathrm{\σ}}}_0^2(n-1)+p_0\·{\widehat{\mathrm{\σ}}}_0^2\left(n\right)---\left(2\right)$

Wherein, n is the sequence number of subcycle, and current subcycle is the n sub-cycles; p ₀Be the recurrence factor, its span is 0＜p ₀≤1;

The dB value of average ISCP when being the end of n sub-cycles,

It is the ISCP arithmetic average dB value that the ISCP arithmetic mean of n sub-cycles is converted to.

The value of said T is-85dBm.

The value of said M is the arbitrary integer value in 5～10.

To sum up can know, a kind of statistical method of Interference Signal Code Power is provided among the present invention.In the statistical method of said Interference Signal Code Power; Owing to be provided with a power threshold T and threshold value M in advance; And the value to the ISCP of each sub-frame adds up, and for the subframe of preceding M ISCP value greater than T, the value of its ISCP counts accumulated value according to the value of T; And when each sub-cycles finishes; Calculate the ISCP arithmetic mean of each sub-cycles according to resulting accumulated value; Convert the ISCP arithmetic mean of each sub-cycles to the dB value again then, and when report cycle finishes, obtain the dB value of the average ISCP of said report cycle according to the dB value of each sub-cycles; And it is reported RNC, thereby can reduce or avoid of the influence of high-power bursty interference effectively to statistics.

Description of drawings

Fig. 1 is the schematic flow sheet of the statistical method of the Interference Signal Code Power among the present invention.

Embodiment

For making the object of the invention, technical scheme and advantage express clearlyer, the present invention is remake further detailed explanation below in conjunction with accompanying drawing and specific embodiment.

The invention provides a kind of statistical method of Interference Signal Code Power, in the method, at first report cycle is divided into the m sub-cycles, and a power threshold T and threshold value M are set in advance; Then, in each sub-cycles, the value of the ISCP of each sub-frame is added up, wherein, for the subframe of preceding M ISCP value greater than T, the value of its ISCP counts accumulated value according to the value of T; And when each sub-cycles finishes, calculate the ISCP arithmetic mean of each sub-cycles according to resulting accumulated value; At last; Convert the ISCP arithmetic mean of each sub-cycles to the dB value; And when report cycle finishes; Obtain the dB value of the average ISCP of said report cycle according to the dB value of each sub-cycles, the dB value of the average ISCP of said report cycle is reported RNC, thereby can reduce or avoid of the influence of high-power bursty interference effectively statistics.

Fig. 1 is the schematic flow sheet of the statistical method of the Interference Signal Code Power among the present invention.As shown in Figure 1, in the statistical method of Interference Signal Code Power in the present invention, mainly comprise the step that is described below:

Step 101 is divided into the m sub-cycles with report cycle, and a power threshold T and threshold value M are set in advance.

In this step, can report cycle be divided into the m sub-cycles, wherein, m is a natural number, and the value of m can be provided with according to practical situations in advance, for example, m=10,15 or 20 etc.In addition, in an embodiment of the present invention, also a power threshold T and threshold value M will be set in advance.When the value of the instantaneous ISCP in certain sub-frame during greater than T, can think that then this subframe has received high-power interference, UE can't normally insert in this subframe; And, can think that then access service has been subjected to bigger influence at random when having in the sub-cycles can't normally insert above the M sub-frame time.Therefore, above-mentioned T and the value of M can be provided with according to practical situations in advance, and for example, in specific embodiment of the present invention, the value of above-mentioned T can be-85dBm or other suitable value; The value of above-mentioned M can be the arbitrary integer value in 5～10, or other suitable value.

Step 102, in each subcycle, the value of the ISCP of each sub-frame added up obtains the ISCP accumulated value, and wherein, for the subframe of preceding M ISCP value greater than T, the value of its ISCP counts the ISCP accumulated value according to the value of T; When each sub-cycles finishes, calculate the ISCP arithmetic mean of each sub-cycles according to the ISCP accumulated value of each sub-cycles.

In this step, in each subcycle, all will the value of the ISCP of each sub-frame in this subcycle be added up, thereby obtain the ISCP accumulated value of this subcycle.Wherein, when carrying out above-mentioned adding up, for the subframe of preceding M ISCP value greater than T, the value of its ISCP will count accumulated value according to the value of T, rather than count the ISCP accumulated value of this subcycle according to the actual value of its ISCP; And for other subframe (for example, the ISCP value is less than or equal to the subframe of T, or M+1 ISCP value is greater than subframe of T etc.), then the value of its ISCP will directly count in the accumulated value according to actual value.Through above-mentioned accumulate mode; It is less (for example to work as the too high number of subframes of ISCP value in the sub-cycles; Be less than M); Also can when causing obvious the influence, not limit of the lifting effect of too high ISCP value effectively to the business of system (for example, access service) at random to the ISCP accumulated value of this subcycle; And the too high number of subframes of ISCP value is more (for example in the sub-cycles; More than M); Be enough to business to system when causing obvious the influence; Then no longer limit of the influence of ISCP value, thereby can reflect actual disturbed condition more truly, prevent that effectively RNC from doing the judgement that makes mistake and carrying out unnecessary Radio Resource adjustment the ISCP accumulated value of this subcycle.Therefore, in actual applications, can set in advance the value of above-mentioned threshold value M according to actual conditions.

After obtaining the ISCP accumulated value of above-mentioned subcycle; When each sub-cycles finishes; Can obtain the ISCP arithmetic mean of each sub-cycles through arithmetic average method commonly used, for example, when each sub-cycles finishes; Can be with the ISCP accumulated value of each sub-cycles divided by the number of sub frames that adds up (being the number of sub frames in the subcycle), thus the ISCP arithmetic mean of each sub-cycles obtained.

Step 103; In same report cycle; Convert the ISCP arithmetic mean of each sub-cycles to ISCP arithmetic average dB value; And when each subcycle finishes, the dB value of the average ISCP when obtaining current subcycle end according to the ISCP arithmetic average dB value of current subcycle and each sub-cycles before thereof; When report cycle finished, the dB value of the average ISCP when last subcycle in this report cycle is finished reported RNC as the dB value of the average ISCP of this report cycle.

In this step, at first can be through conversion method commonly used in this area, all convert the ISCP arithmetic mean of instantaneous value of each sub-cycles to corresponding dB value, i.e. ISCP arithmetic average dB value; Then; When each subcycle finishes; Through dB territory recursive average computation method, carry out the average calculating of dB territory recurrence based on the ISCP arithmetic average dB value of current subcycle and each sub-cycles before thereof, thus the dB value of the average ISCP when obtaining current subcycle and finishing; At last, when this report cycle finished, the dB value of the average ISCP in the time of last subcycle in this report cycle can being finished reported RNC as the dB value of the average ISCP of this report cycle.

Preferable, in specific embodiment of the present invention, can carry out above-mentioned dB territory recursive average computation, the dB value of the average ISCP when obtaining n sub-cycles (being current subcycle) end according to the formula that is described below:

${\widehat{\mathrm{\σ}}}_0^2\left(n\right)=(1-p_0)\·{\stackrel{\‾}{\mathrm{\σ}}}_0^2(n-1)+p_0\·{\widehat{\mathrm{\σ}}}_0^2\left(n\right)---\left(2\right)$

Wherein, n is the sequence number of subcycle; p ₀Be the recurrence factor, its span is 0＜p ₀≤1, p ₀Concrete value can be provided with according to actual needs and in advance;

The dB value of average ISCP when being n sub-cycles (being current subcycle) end,

Be the dB value that the ISCP arithmetic mean of n sub-cycles is converted to, i.e. ISCP arithmetic average dB value.

To sum up can know, propose the statistical method of above-mentioned Interference Signal Code Power in an embodiment of the present invention.In the statistical method of above-mentioned Interference Signal Code Power; Because a power threshold T and threshold value M are set in advance; And when in each sub-cycles, the value of the ISCP of each sub-frame being added up, for the subframe of preceding M ISCP value greater than T, the value of its ISCP all counts accumulated value according to the value of T; Then and when each sub-cycles finishes, calculate the ISCP arithmetic mean of instantaneous value of each sub-cycles based on resulting accumulated value; Then, convert the ISCP arithmetic mean of instantaneous value of each sub-cycles to the dB value, and when report cycle finishes; Obtain the dB value of the average ISCP of said report cycle based on the dB value of each sub-cycles; The dB value of the average ISCP of said report cycle is reported RNC, therefore can reduce the complexity of calculating, obtain the average ISCP in the more moment; Can reflect the interference that The Long-term Effect is professional; When high-power interference disappears, can not produce long hangover, overcome the defective in the former hybrid algorithm, for high-power bursty interference; Its lifting degree to the value of the average ISCP that reports RNC can reflect the influence degree of this high-power interference to the access service of system preferably, thereby can reduce or avoid the influence of high-power bursty interference to statistics effectively.

The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.

Claims (5)

1. the statistical method of an Interference Signal Code Power is characterized in that, this method comprises:

Report cycle is divided into the m sub-cycles, and power threshold T and threshold value M are set in advance;

In each subcycle, the value of the Interference Signal Code Power ISCP of each sub-frame added up obtains the ISCP accumulated value, and wherein, for the subframe of preceding M ISCP value greater than T, the value of its ISCP counts the ISCP accumulated value according to the value of T; When each sub-cycles finishes, calculate the ISCP arithmetic mean of each sub-cycles according to the ISCP accumulated value of each sub-cycles;

In same report cycle; Convert the ISCP arithmetic mean of instantaneous value of each sub-cycles to ISCP arithmetic average dB value; And when each subcycle finishes, the dB value of the average ISCP when obtaining current subcycle end based on the ISCP arithmetic average dB value of current subcycle and each sub-cycles before thereof;

When report cycle finished, the dB value of the average ISCP when last subcycle in the said report cycle is finished reported RNC as the dB value of the average ISCP of report cycle.

2. method according to claim 1 is characterized in that, the ISCP arithmetic mean that said ISCP accumulated value according to each sub-cycles calculates each sub-cycles comprises:

With the ISCP accumulated value of each sub-cycles divided by the number of sub frames in the subcycle, thereby obtain the ISCP arithmetic mean of each sub-cycles.

3. method according to claim 1 and 2 is characterized in that, the formula of the dB value of the average ISCP when calculating current subcycle and finishing is:

${\stackrel{\‾}{\mathrm{\σ}}}_0^2\left(n\right)=(1-p_0)\·{\stackrel{\‾}{\mathrm{\σ}}}_0^2(n-1)+p_0\·{\widehat{\mathrm{\σ}}}_0^2\left(n\right)---\left(2\right)$

Wherein, n is the sequence number of subcycle, and current subcycle is the n sub-cycles; p ₀Be the recurrence factor, its span is 0＜p ₀≤1;

The dB value of average ISCP when being the end of n sub-cycles,

It is the ISCP arithmetic average dB value that the ISCP arithmetic mean of n sub-cycles is converted to.

4. method according to claim 1 is characterized in that: the value of said T is-85dBm.

5. method according to claim 1 is characterized in that: the value of said M is the arbitrary integer value in 5～10.

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