CN1859764A - Call ready to cut-in control method and device - Google Patents

Abstract

The present invention discloses calling admission control method. Said method includes A, judging current whether being congestion state, if then rejecting receiving current access request and ending current processing; otherwise executing step B; B, to obtain accessing new service channel quality indication CQI report estimated value, judging said CQI report estimated value whether reaching service corresponded CQI threshold, if is then executing step C; otherwise rejecting receiving current access request and ending current processing process; C, to obtain accessing new service power requirement estimated value, judging said power requirement estimated value whether exceeding predetermined power threshold, if is then rejecting receiving current access request; otherwise receiving current access request. The present invention also discloses a device. Said invented method and device can execute admission control to high real time and continuance high bit rate service.

Description

A kind of call admission control method and device

Technical field

The present invention relates to the Admission Control technical field, particularly a kind of call admission control method and device that is applied to high speed downlink packet access (HSDPA, High Speed Downlink Packet Access).

Background technology

At present, HSDPA is the key property of 3GPP R5 version, and the series of key techniques such as fast dispatch by adaptive modulation and coding (AMC), mixing re-transmission (HARQ) and base station have realized descending high speed data transfer.

Because HSDPA has higher spectrum efficiency with respect to dedicated channel, so industry is considering that media stream (Streaming) business that will be expected to play an important role is mapped on the HSDPA in 3G mobile network's Packet data service evolution.At this moment, the HSDPA channel is when accepting the access request of a new stream business, and the professional service quality of existing stream should not be affected on the HSDPA channel.Therefore, the radio network controller (RNC) of Wideband Code Division Multiple Access (WCDMA) (WCDMA) system will adopt Admission Control mechanism to guarantee stream quality of service on the HSDPA channel.Here, the business of WCDMA system support can divide work four big classes: session (Conversational) is professional, stream (Streaming) is professional, backstage (Background) professional and mutual (Interactive) business, described backstage business and interactive service are to the insensitive business of time delay, also be known as (BE, the Best Effort) business of doing one's best.

But the initial designs of HSDPA is a kind of channel at the insensitive non-real-time service of time delay, and the professional high bit rate that has higher delay requirement and continue of stream.Therefore, the last existing calling access method for the HSDPA channel of RNC does not all have the access control of consideration such as the stream business that strict delay requirement is arranged, usually only consider some to time delay insensitive backstage business or interactive service, so only adopt straightforward procedures such as throughput thresholding or user's number thresholding to carry out access control.These existing admittance control methods all are inapplicable for stream is professional, if the convection current business is carried out access control, will consider more fully the influence that the operating position of HSDPA channel resource, new stream business may be brought.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of call admission control method and device, can be at the business realizing Admission Control of have relatively high expectations real-time and lasting high bit rate.

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

The invention discloses a kind of call admission control method, after the access request that receives new business, this method comprises:

A. judge the current congestion state that whether is in, if then refusal is accepted current access request, finishes current handling process; Otherwise execution in step B;

B. estimate to obtain current new business user's channel quality indication CQI report estimated value, judge whether this CQI report estimated value reaches the CQI thresholding of current new business, if, execution in step C then; Otherwise refusal is accepted current access request, finishes current handling process;

C. estimate to obtain to insert the power requirement estimated value after the new business, judge whether this power requirement estimated value exceeds default power threshold, if then refusal is accepted current access request; Otherwise accept current access request.

Wherein, the described method that is in congestion state that judges whether of steps A is: obtain the congestion state indication, indicate whether effectively to judge whether to be in congestion state according to this congestion state.

Wherein, the method that the described estimation of step B obtains the CQI report estimated value is: obtain current new business user's pilot strength report, estimate to obtain this new business user's CQI report estimated value again according to this pilot strength report.

Among the step B, the described method of estimating to obtain this new business user's CQI report estimated value according to pilot strength report is: obtain pilot frequency intensity from this pilot strength report, and obtain current new business user's signal interference ratio SIR estimated value according to this pilot frequency intensity; Determine to guarantee that certain block error rate BLER and its corresponding sir value are no more than each CQI value of this SIR estimated value, and with the CQI report estimated value of the CQI maximum in determined each CQI value as this new business user.

Among the step B, the acquisition methods of the CQI thresholding of described current new business is: calculate according to the guarantee bit rate GBR requirement of current new business and new business user's ability parameter, retrieve the transport block set TBS value set in current new business user's the CQI value mapping table according to result of calculation, obtain the minimum TBS value that this new business requires, the CQI value mapping table by this new business user shines upon the CQI value that obtains this minimum TBS value correspondence and with its CQI thresholding as current new business again.

Among the step B, the described method that obtains the minimum TBS value of new business requirement is:

Wherein, CQI _{Th, i}Be the CQI thresholding of current new business, TBS _{CQIth, i}For with CQI _{Th, i}The minimum TBS value that this corresponding new business requires, GBR _iGBR requirement for current new business, i is the numbering of current new business, and Min Inter-TTI Interval is new business user's a ability parameter, the minimum transfer time interval TTI that on behalf of this new business user, this new business user's ability parameter can support, margin is default allowance

The processing that rounds up of the discrete data in the CQI value mapping table is adopted in expression.

Wherein, the method that the described estimation of step C obtains the power requirement estimated value is: the Transmission Time Interval TTI number that calculates the requirement of current new business per second, the TTI number that requires according to this new business per second calculates the performance number that this new business requires, and the performance number that this new business requires and existing professional power summation addition obtain inserting the power requirement estimated value after this new business.

Among the step C, the described method that calculates the TTI number of current new business per second requirement is: the CQI value mapping table mapping by this new business user obtains the TBS value of described CQI report estimated value correspondence, and obtains the GBR requirement of current new business; Require to calculate the TTI number of current new business per second requirement according to this TBS value and this GBR.

Wherein, accept further to comprise before the current access request at described refusal: the Admission Control flow process that the access request of current new business is gone to dedicated channel DCH, and when the Admission Control flow process refusal of this DCH inserted this access request, refusal was accepted current access request.

The invention also discloses a kind of Admission Control device, this device comprises:

Congested access module receives the access request and the congestion state indication of new business from the outside, the access request with this new business when judgement is not in congestion state goes to CQI access module;

CQI access module, be used for receiving the access request of new business from described congested access module, estimate current new business user's CQI report estimated value, the access request with this new business when definite this CQI report estimated value reaches the CQI thresholding of this new business goes to power access module;

Power access module, be used for receiving the access request of new business from described CQI access module, estimating power requires estimated value, accepts the access indication that this new business inserts request to outside output when determining that this power requirement estimated value does not exceed default power threshold.

Wherein, described CQI access module comprises:

The SIR estimation module is used for receiving from congested access module the access request of new business, obtains current new business user's SIR estimated value and exports to the CQI estimation module;

The CQI estimation module is used for receiving described SIR estimated value and definite current new business user's CQI report estimated value and exporting to the CQI judging module from described SIR estimation module;

The CQI judging module, be used for receiving described CQI report estimated value from described CQI estimation module, obtain the CQI thresholding of current new business, and when determining that this CQI report estimated value reaches the CQI thresholding of this new business, the access request of this new business is gone to described power access module.

Wherein, described power access module comprises:

The TTI computing module is used for receiving from described CQI access module the access request of new business, calculates the TTI number of current new business requirement and exports to power computation module;

Power computation module, be used for receiving described TTI number and calculating the power requirement value of current new business from described TTI computing module, obtain the power of current existing business, calculate and insert the power requirement estimated value after the current new business and export to the power judging module;

The power judging module is used for receiving described power requirement estimated value from described power computation module, preserves power threshold, does not export described access indication to the outside when definite this power requirement estimated value exceeds default power threshold.

Wherein, this device perhaps is integrated among the RNC of WCDMA system for the independent entity that is provided with; Described new business is stream Streaming business.

By such scheme as can be seen, key of the present invention is: congestion state judgement, the judgement of CQI access and the judgement of power access are carried out in the access request of new business successively.Therefore, call admission control method provided by the present invention and device can at first be avoided inserting new business during at busy or inadequate resource in system, adjudicating the new business that user channel quality is very poor by the CQI access again refuses, and can in last power access judgement, do estimation comparatively accurately to the system power resource, to guarantee the quality of existing business and new business.Mechanism of the present invention has been taken all factors into consideration to have than the characteristic of the business of high real-time and lasting high bit rate such as stream business etc. and has been carried out access control, efficiently solves the problem that this type of service access technology exists on the present HSDPA channel.

Description of drawings

Fig. 1 is the inventive method one preferred embodiment handling process schematic diagram;

Fig. 2 concerns schematic diagram between each performance number in the power access judgement of the inventive method;

Fig. 3 is that structural representation is formed in apparatus of the present invention one preferred embodiment.

Embodiment

The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.

The invention provides a kind of call admission control method, its main design philosophy is: after the access request that receives new business, at first enter congestion state judgement flow process, enter CQI access judgement flow process when judgement is not congested; Then, ingoing power access judgement flow process when judgement CQI report estimated value can reach the CQI thresholding of current new business requirement; At last, when not exceeding default power threshold, judgement power requirement estimated value accepts current access request.

Wherein, the present invention is applied to Access Network (RAN, Radio Access Network) in the equipment, is applied to usually among the radio network controller (RNC) of Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, and can specifically realizes the present invention by the Admission Control module among the RNC.Range of application of the present invention is not limited in RNC, and the various equipment that are used for the incoming stream business and need the convection current business to carry out access control all can be used the present invention, and this paper will be that example is set forth the inventive method with the Admission Control module among the RNC.

Fig. 1 is the inventive method one preferred embodiment handling process schematic diagram.As shown in Figure 1, after the Admission Control module among the RNC receives the access request of new stream business, carry out following treatment step:

Step 101: judge whether the stream business on the current HSDPA channel is in congestion state, if then execution in step 109; Otherwise execution in step 102.

Here, be used among the RNC handling the congestion state indication that the professional congested control module of HSDPA stream can send HSDPA channel upper reaches business to the Admission Control module of RNC, this Admission Control module can indicate whether effectively to judge whether to be in congestion state according to the congestion state that receives.And how to carry out congested control and obtain the processing that congestion state is indicated about congested control module, belonging to the congestion control mechanism category, also there have been various congested control technologys in industry, and non-emphasis of the present invention, and therefore, this paper is not further described this.

Step 102: the pilot strength report of obtaining current new stream service-user.Here, the method for specifically obtaining pilot strength report belongs to the prior art category, and the present invention does not limit this.

Step 103: the pilot strength report of obtaining according to step 102 estimates to obtain channel quality indication (CQI) report estimated value of this new stream service-user.In this article, described service-user can be interpreted as the subscriber equipment (UE) that service-user uses.

Step 104:, judge whether this CQI report estimated value reaches the CQI thresholding of this new stream business, if then execution in step 105 according to the CQI report estimated value that step 103 obtains; Otherwise execution in step 109.

Wherein, can use the pilot strength report of the new stream service-user that is obtained, described method estimates to obtain the CQI report estimated value of this new stream service-user below adopting, and this method comprises:

One, the signal interference ratio (SIR) that carries out high-speed downstream physical data shared channel (HS-PDSCH) is estimated.

On the one hand, the SIR on the HS-PDSCH channel of UEj can be expressed as formula (1)

${\mathrm{SIR}}_{\mathrm{HS}-\mathrm{PDSCH},j}=\frac{P_{\mathrm{CPICH},i}\·\mathrm{\Γ}\·G_{i,j}\·{\left|h_{i,j}\right|}^2}{(1-{\mathrm{\α}}_{i,j})\·P_{\mathrm{tot},i}\·G_{i,j}\·{\left|h_{i,j}\right|}^2+\underset{\underset{n\≠i}{\∀n}}{\mathrm{\Σ}}{P}_{\mathrm{tot},n}\·G_{n,j}+N_0}---\left(1\right)$

Wherein, SIR _{HS-PDSCH, j}Be the SIR on the HS-PDSCH channel of UEj, P _CICHBe Common Pilot Channel (CPICH) power, Γ is for measuring power bias (MPO), be the biasing of the relative CPICH channel power of HS-PDSCH channel gross power, Г is the difference of HS-PDSCH channel gross power and pilot channel power, rather than the parameter of actual system configuration; N ₀Be background noise; J is the UE numbering, and i is a UE affiliated subdistrict base station numbering; α _{I, j}Be the orthogonalization factor, | h _{I, j}| ²Be rapid fading, α _{I, j}With | h _{I, j}| ²Be used to carry the link of HS-PDSCH; P _{Tot, i}Be total transmitting power of cell i, P _{Tot, n}Total transmitting power for sub-district n; G _{I, j}Be the path gain between UEj and cell i, G _{N, j}Be the path gain between UEj and sub-district n.

And on the other hand, pilot frequency intensity CPICH_Ec/No can be represented as following formula (2):

$\mathrm{CPICH}\_\mathrm{Ec}/\mathrm{No}=\frac{P_{\mathrm{CPICH},i}\·G_{i,j}\·{\left|h_{i,j}\right|}^2}{P_{\mathrm{tot},i}\·G_{i,j}\·{\left|h_{i,j}\right|}^2+\underset{\underset{n\≠i}{\∀n}}{\mathrm{\Σ}}{P}_{\mathrm{tot},n}\·G_{n,j}+N_0}---\left(2\right)$

So, can think SIR _{HS-PDSCH, j}Estimated value as shown in Equation (3):

SIR _HS-PDSCH，j≈CPICH_Ec/No·Γ (3)

Here, by comparing the SIR of formula (1) and formula (3) _{HS-PDSCH, j}As can be known, the SIR of this formula (3) _{HS-PDSCH, j}Estimated value is slightly less than the SIR of formula (1) _{HS-PDSCH, j}Actual value; In addition, RNC can obtain CPICH_Ec/No from the pilot strength report of being obtained.

Two, according to SIR _{HS-PDSCH, j}Estimated value, RNC can check this SIR _{HS-PDSCH, j}Whether estimated value enough gets well the certain Block Error Rate (BLER) to guarantee to preset, thereby obtains the CQI report estimated value, the formula (4) that this CQI report estimated value can be expressed as.

$\mathrm{CQI}=i,i\∈\underset{\∀i}{\max }({\mathrm{SIR}}_{\mathrm{BLER}\≤10\%,i}\≤{\mathrm{SIR}}_{\mathrm{HS}-\mathrm{PDSCH},j})---\left(4\right)$

Wherein, i represents CQI value, SIR _{HS-PDSCH, j}It is the sir value that UEj goes out for the HS-PDSCH channel estimating.It is 10% that formula (4) is set the BLER that will guarantee, so SIR _{BLER≤10%, i}For BLER smaller or equal to 10% o'clock pairing sir value of HS-PDSCH channel.So-called CQI report estimated value is a kind of channel quality indication that provides after UE estimates channel quality, can pre-configured SIR, BLER and the CQI value between the mapping relations table, this mapping table can obtain by emulation, thereby the maximum CQI value that requires of the BLER that can obtain meeting this SIR estimated value and default 10%, promptly satisfy SIR _{BLER≤10%, i}≤ SIR _{HS-PDSCH, j}CQI maximum in each CQI value of condition, and determine that this CQI maximum is a current C QI report estimated value.Here, satisfy SIR _{BLER≤10%, i}≤ SIR _{HS-PDSCH, j}The CQI value of condition is: its corresponding SIR is no more than SIR _{HS-PDSCH, j}, and guarantee 10% CQI value with interior BLER; In addition, by the estimated value of SIR as can be known SIR noted earlier _{HS-PDSCH, j}Be slightly less than the actual value of SIR, therefore meet SIR _{BLER≤10%, i}≤ SIR _{HS-PDSCH, j}Each sir value of condition necessarily less than current new business user's SIR actual value, can access CQI estimated value comparatively accurately thereby be beneficial to this formula (4).

Three, according to more than the CQI report estimated value that obtains judge that whether this CQI report estimated value reaches the CQI thresholding of current new stream business, if do not reach, then should not be linked into this new business on the HSDPA channel.

Here, can adopt the ability parameter of estimated value that the guarantee bit rate (GBR) that carries in the Iu message of current new stream business requires and current new stream service-user to calculate, and retrieve transport block set (TBS) value that TBS value set in the CQI value mapping table of current new stream service-user obtains the minimum of current new stream business need according to this result of calculation, this minimum TBS value corresponding CQI value in CQI value mapping table is exactly the CQI thresholding of current new stream business.For example: can obtain the CQI thresholding by following formula (5).According to the WCDMA standard, to be the pre-defined a kind of CQI value mapping table of each class UE, this mapping table comprises: the set of the set of CQI value and transport block set (TBS) value, and the corresponding modulation system of each CQI value, TBS value, code rate value etc. in the set of this CQI value; Described Iu message refers to the message of Iu interactive interfacing between RNC and the base station node B, and the present invention does not limit for the message of the concrete representative of Iu message.

Wherein, CQI _{Th, i}Be the CQI thresholding that will obtain, TBS _{CQIth, i}For with CQI _{Th, i}Corresponding TBS value is the TBS value of the minimum of current new stream business need, GBR _iBe the GBR requirement that the Iu message of current business is carried, the size estimation of MAC-hs PDU head that this GBR has required additional consideration, wherein i is the numbering of current business; Min Inter-TTI Interval is a kind of ability index parameter of UE, its implication is meant the minimum transfer time interval (TTI) that UE can support, that is to say: UE needs " MinInter-TTI Interval " so a plurality of TTI to finish essential inter-process at least;

The processing that rounds up of the discrete data in the CQI value mapping table is adopted in expression; Margin can obtain by field testing or emulation for default allowance; Because the duration of a TTI is 2 milliseconds, so the sum of 500 TTI that can provide each second for the HS-PDSCH channel.

Step 105: the CQI report estimated value of this new stream service-user that estimation obtains according to step 103 obtains the pairing TBS value of the described CQI report estimated value of step 104 from the retrieval of CQI value mapping table.

Step 106: the TBS value that obtains according to step 105 and guarantee bit rate (GBR) requirement of this new stream business calculate professional desired Transmission Time Interval each second (TTI) number of this new stream.

Step 107: the TTI number that require the each second that obtains according to step 106 calculates the performance number of this new stream business need.

Step 108: calculate total power value after the performance number of this new stream business need and current each professional performance number that has inserted estimate to obtain to insert this new stream business according to step 107, promptly insert the power requirement estimated value after the new stream business, judge that this estimation obtains total power value and whether exceeds default power threshold, if then execution in step 110; Otherwise execution in step 109.

Here, the gross power of HS-PDSCH channel is constant, and the gross power that this HS-PDSCH channel is constant is designated as P _HSPDSCHThe power of UEi is designated as P _{SS, i}UE then ₁UE _nThe power sum of this n UE is designated as

Present embodiment is set: UE ₁UE _N-1The UE that has inserted for RNC, and UE _nThe UE of the new stream business that inserts for current request, then Can be used to represent to estimate to obtain to insert the total power value after this new stream business; Described default power threshold can be designated as P _{SS, th}, this P _{SS, th}Should equal P for a short time _HSPDSCHBy formula the condition shown in (6) is carried out the described judgement of step 108:

$\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{P}_{\mathrm{SS},i}\≤P_{\mathrm{SS},\mathrm{th}}---\left(6\right)$

For further understanding the relation between each performance number in the described judgement of step 108, these performance numbers are described below in conjunction with Fig. 2.Fig. 2 concerns schematic diagram between each performance number in the power access judgement of the inventive method.As shown in Figure 2, estimate total power value after the current new stream business of the access obtain

With time correlation.As time goes on, the power that the number of the UE that RNC inserts and each UE require all can change, therefore, and should

Value will change in time and change, when this

Value equal P for a short time _{SS, th}The time, current new stream business can insert; But when being somebody's turn to do

Value greater than P _{SS, th}The time, current new stream business should not be access in.As can be seen from Fig. 2, this default P _{SS, th}Certain for the constant gross power P of HS-PDSCH channel _HSPDSCH, this P _HSPDSCHCan be regarded as the HSDPA resource on the Admission Control meaning.

Wherein, the power P of the new business of current request access _{SS, n}Method of estimation be: because the gross power of HS-PDSCH channel is constant, so the power of every TTI is exactly known.Each stream on HSDPA is professional, require and the TBS value can access this and flows the TTI number that professional per second requires according to the GBR that considers MAC-hs PDU head size, flow the average power that professional per second uses thereby can obtain this by the TTI number of per second requirement, can be with the power estimated value of this average power as this UE.For example: if need 5 TTI transmit data certain first-class professional each second, average power ratio that then should the relative HS-PDSCH gross power of stream business is 5/500, promptly 1/100.It should be noted that: so-called here average power is the GBR requirement of carrying at the actual bit rate of eating dishes without rice or wine rather than Iu message.So, adopt step 102 to the described method of step 104 to carry out the CQI report value and estimate, can obtain the UE that current request inserts new stream business _nThe CQI report estimated value, and then obtain the TBS value of this CQI report estimated value correspondence.The GBR requirement of the consideration MAC-hs PDU head size of the new stream business that inserts according to resulting TBS value and current request just can obtain the UE that current request inserts new stream business _nThe TTI number that per second requires.Like this, according to this UE _nThe TTI number that per second requires just can obtain this UE _nPower requirement P _{SS, n}

In addition, according to the public-measurement report from base station node B, RNC can obtain having the professional desired power P of UE of each stream that self has inserted that certain GBR requires _{SS, i}(i=1 ..., n-1).Wherein, in existing protocol, in order to carry out Admission Control and congested control, RNC requires Node B to report the power requirement of each UE.

Because the design original intention of HSDPA is to be used for the BE business, so, described P _{SS, th}Be provided with and can depend on that the HSDPA upper reaches is professional and do one's best (BE, Best Effort) professional coexistence strategy.But the present invention does not limit in the Admission Control flow process of the present invention such as P _{SS, th}Etc. the concrete method to set up of threshold value and the strategy that these thresholding institute foundations are set.

Step 109: refuse the access request of this new stream business, finish current handling process.

Wherein, the described refusal of this step refers to refuse insert this new stream business on the HSDPA channel, when refusing the access request of new stream business, the Admission Control flow process of the HSDPA channel that the present invention relates to just is through with, RNC just can directly refuse the access request of this new stream business, thus this new stream service access failure.

In addition, the access request of the stream business that RNC also can be new with this goes to the access control flow process of dedicated channel (DCH).Like this, if this new stream business is allowed to access in the access control flow process of this DCH, then RNC will insert this new stream business; If this new stream business is rejected access in the access control flow process of this DCH, RNC refuses this new stream business again, thus access failure.Here, be not the problem that the present invention relates to about the admission control mechanism of DCH, therefore be not further described here.

Step 110: accept the access request of this new stream business.

Based on the invention described above method, the invention allows for a kind of Admission Control device, this device comprises three parts: congested access module, CQI access module and power access module.This device can be integrated among the RNC, also can link to each other for the independent entity that is provided with and with RNC.

Fig. 3 is that structural representation is formed in apparatus of the present invention one preferred embodiment.As shown in Figure 3, this Admission Control device is made of three modules, comprising: congested access module, CQI access module and power access module.

Wherein, congested access module is used for receiving from the outside access request of new business, and from the congested control module reception congestion state indication of RNC, the access request with this new business when judgement is not in congestion state goes to CQI access module; CQI access module is used for receiving from described congested access module the access request of new business, estimate current new business user's CQI report estimated value, the access request with this new business when determining that this CQI report estimated value does not exceed default CQI thresholding goes to power access module; Power access module, be used for receiving the access request of new business from described CQI access module, estimating power requires estimated value, accepts the access indication that this new business inserts request to RNC output expression when determining that this power requirement estimated value does not exceed default power threshold.

The function of the invention described above device can realize by the method for flow chart shown in Figure 1, therefore, described CQI access module can comprise: SIR estimation module, CQI estimation module and CQI judging module, described power access module can comprise: TTI computing module, power computation module and power judging module.

In CQI access module, the SIR estimation module is used for receiving from congested access module the access request of new business, obtains current new business user's SIR estimated value and exports to the CQI estimation module; The CQI estimation module is used for receiving SIR estimated value and definite current new business user's CQI report estimated value and exporting to the CQI judging module from the SIR estimation module; The CQI judging module is used for receiving the CQI report estimated value from described CQI estimation module, obtain the CQI thresholding of current new business, and when determining that this CQI report estimated value reaches the CQI thresholding of this new business, the access request of this new business gone to the TTI computing module in the power access module.Here, method when the SIR estimation module is estimated SIR is as described in the front formula (3), the method that the CQI estimation module obtains the CQI report estimated value is as described in the front formula (4), and the method that the CQI judging module is obtained the CQI thresholding describes in detail at this no longer one by one as described in the front formula (5).

In power access module, the TTI computing module is used for receiving from the CQI judging module of described C0I access module the access request of new business, calculates the TTI number of current new business requirement and exports to power computation module; Power computation module is used for receiving described TTI number and calculating the power requirement value of current new business from the TTI computing module, obtain the power of current existing business, calculate and insert the power requirement estimated value after the current new business and export to the power judging module; The power judging module is used for receiving described power requirement estimated value from power computation module, preserves power threshold, does not indicate to outside output access when definite this power requirement estimated value exceeds default power threshold.Here, described TTI computing module calculate method that TTI number and power computation module calculate the power requirement value as the step 105 of previous methods embodiment as described in the step 107, describe in detail no longer one by one at this.

By the invention described above embodiment as seen, the present invention handles mainly and comprises: congestion state judgement flow process, CQI access judgement flow process and power access decision flow journey.Can avoid inserting new stream business during at busy or inadequate resource by congestion state judgement flow process, because when existing business can not get supporting, insert the new both unreasonable quality of service that also do not guarantee of stream business, i.e. Ye Wu time delay and bit rate in system.And in CQI access judgement flow process, the stream service denial of UE that can channel quality is very poor falls, because the stream service access of the UE that these channel qualities are very poor also can't satisfy its operation quality requirement even all system resource is all distributed to this UE.Last power access decision flow journey is exactly not have when congested system resource (power) done comparatively accurately in system to estimate, to guarantee that each existing new stream quality of service professional and that request inserts can be guaranteed after inserting new stream business.Therefore, the inventive method is particularly suitable for carrying out Admission Control at the business of have relatively high expectations real-time and lasting high bit rate, and the present invention at present is primarily aimed at is exactly the stream business, and the various requirement that the present invention equally also can be used for may occurring future carries out Admission Control than the business of high real-time and lasting high bit rate.

Claims (13)

1, a kind of call admission control method is characterized in that, after the access request that receives new business, this method comprises:

A. judge the current congestion state that whether is in, if then refusal is accepted current access request, finishes current handling process; Otherwise execution in step B;

B. estimate to obtain current new business user's channel quality indication CQI report estimated value, judge whether this CQI report estimated value reaches the CQI thresholding of current new business, if, execution in step C then; Otherwise refusal is accepted current access request, finishes current handling process;

C. estimate to obtain to insert the power requirement estimated value after the new business, judge whether this power requirement estimated value exceeds default power threshold, if then refusal is accepted current access request; Otherwise accept current access request.

2, method according to claim 1 is characterized in that, the described method that is in congestion state that judges whether of steps A is: obtain the congestion state indication, indicate whether effectively to judge whether to be in congestion state according to this congestion state.

3, method according to claim 1, it is characterized in that, the method that the described estimation of step B obtains the CQI report estimated value is: obtain current new business user's pilot strength report, estimate to obtain this new business user's CQI report estimated value again according to this pilot strength report.

4, method according to claim 3, it is characterized in that, among the step B, the described method of estimating to obtain this new business user's CQI report estimated value according to pilot strength report is: obtain pilot frequency intensity from this pilot strength report, and obtain current new business user's signal interference ratio SIR estimated value according to this pilot frequency intensity; Determine to guarantee that certain block error rate BLER and its corresponding sir value are no more than each CQI value of this SIR estimated value, and with the CQI report estimated value of the CQI maximum in determined each CQI value as this new business user.

5, method according to claim 1, it is characterized in that, among the step B, the acquisition methods of the CQI thresholding of described current new business is: calculate according to the guarantee bit rate GBR requirement of current new business and new business user's ability parameter, retrieve the transport block set TBS value set in current new business user's the CQI value mapping table according to result of calculation, obtain the minimum TBS value that this new business requires, the CQI value mapping table by this new business user shines upon the CQI value that obtains this minimum TBS value correspondence and with its CQI thresholding as current new business again.

6, method according to claim 5 is characterized in that, among the step B, the described method that obtains the minimum TBS value of new business requirement is:

Wherein, CQI _Th, i is the CQI thresholding of current new business, TBS _{CQIth, i}For with CQI _{Th, i}The minimum TBS value that this corresponding new business requires, GBR _iGBR requirement for current new business, i is the numbering of current new business, and Min Inter-TTI Interval is new business user's a ability parameter, the minimum transfer time interval TTI that on behalf of this new business user, this new business user's ability parameter can support, margin is default allowance The processing that rounds up of the discrete data in the CQI value mapping table is adopted in expression.

7, method according to claim 1, it is characterized in that, the method that the described estimation of step C obtains the power requirement estimated value is: the Transmission Time Interval TTI number that calculates the requirement of current new business per second, the TTI number that requires according to this new business per second calculates the performance number that this new business requires, and the performance number that this new business requires and existing professional power summation addition obtain inserting the power requirement estimated value after this new business.

8, method according to claim 7, it is characterized in that, among the step C, the described method that calculates the TTI number of current new business per second requirement is: the CQI value mapping table mapping by this new business user obtains the TBS value of described CQI report estimated value correspondence, and obtains the GBR requirement of current new business; Require to calculate the TTI number of current new business per second requirement according to this TBS value and this GBR.

9, method according to claim 1, it is characterized in that, accept further to comprise before the current access request at described refusal: the Admission Control flow process that the access request of current new business is gone to dedicated channel DCH, and when the Admission Control flow process refusal of this DCH inserted this access request, refusal was accepted current access request.

10, a kind of Admission Control device is characterized in that, this device comprises:

Congested access module receives the access request and the congestion state indication of new business from the outside, the access request with this new business when judgement is not in congestion state goes to CQI access module;

CQI access module, be used for receiving the access request of new business from described congested access module, estimate current new business user's CQI report estimated value, the access request with this new business when definite this CQI report estimated value reaches the CQI thresholding of this new business goes to power access module;

Power access module, be used for receiving the access request of new business from described CQI access module, estimating power requires estimated value, accepts the access indication that this new business inserts request to outside output when determining that this power requirement estimated value does not exceed default power threshold.

11, device according to claim 10 is characterized in that, described CQI access module comprises:

The SIR estimation module is used for receiving from congested access module the access request of new business, obtains current new business user's SIR estimated value and exports to the CQI estimation module;

The CQI estimation module is used for receiving described SIR estimated value and definite current new business user's CQI report estimated value and exporting to the CQI judging module from described SIR estimation module;

The CQI judging module, be used for receiving described CQI report estimated value from described CQI estimation module, obtain the CQI thresholding of current new business, and when determining that this CQI report estimated value reaches the CQI thresholding of this new business, the access request of this new business is gone to described power access module.

12, device according to claim 10 is characterized in that, described power access module comprises:

The TTI computing module is used for receiving from described CQI access module the access request of new business, calculates the TTI number of current new business requirement and exports to power computation module;

Power computation module, be used for receiving described TTI number and calculating the power requirement value of current new business from described TTI computing module, obtain the power of current existing business, calculate and insert the power requirement estimated value after the current new business and export to the power judging module;

The power judging module is used for receiving described power requirement estimated value from described power computation module, preserves power threshold, does not export described access indication to the outside when definite this power requirement estimated value exceeds default power threshold.

According to each described device of claim 10 to 12, it is characterized in that 13, this device perhaps is integrated among the RNC of WCDMA system for the independent entity that is provided with; Described new business is stream Streaming business.