CN102014430B - Method and device for performing admission control in OFDM (Orthogonal Frequency Division Multiplexing) system - Google Patents

Abstract

The invention relates to a method and a device for performing admission control in an OFDM (Orthogonal Frequency Division Multiplexing) system. The device comprises an information receiving module, a calculation module and a judgment module. The method comprises the following steps of: after receiving an admission request, respectively calculating uplink and downlink time frequency resource amounts needed by a service to be accessed for initiating the admission request within a unit time, and admitting the service under the condition of judging that the uplink and downlink time frequency resource amounts needed by the service within a unit time are both accordingly smaller than current available uplink and downlink time frequency resource amounts of a system. The invention can access a new service to the greatest extent when ensuring the quality of the connected service, thereby enhancing the channel utilization ratio, ensuring the service QoS requirements and also efficiently preventing congestion of the system.

Description

A kind of method and device of in ofdm system, admitting control

Technical field

The present invention relates to moving communicating field, relate in particular to a kind of method and device of in ofdm system, admitting control.

Background technology

In the mobile communication system, admitting control is exactly to the current resource situation of requirement and residential quarter of resource according to business to be accessed in the admittance request message, determine whether can admit new business, to prevent that inserting new business back system overload occurs, keep system stability, simultaneously take full advantage of under the situation of Radio Resource access service as much as possible, and guaranteeing QoS (Quality ofService, the service quality) requirement of current access service.

OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology is the key technology in the 4th third-generation mobile communication field, it is decomposed into data flow at a high speed the low rate data streams of while parallel transmission on a plurality of quadrature carriers by serial to parallel conversion, traditional like this frequency domain resource or time-domain resource are just expanded becomes time frequency two-dimensional resources, has improved the transmission capacity of system greatly.3GPP (3rdGeneration Partnership Project, third generation partner program) LTE (Long TermEvolution, Long Term Evolution) system, IEEE (Institute of Electrical and ElectronicsEngineers, IEEE-USA) 802.16e system (being WiMAX (Worldwide Interoperability for Microwave Access, worldwide interoperability for microwave inserts) system) has all used so two-dimentional running time-frequency resource when physical layer transmission.CDMA (Code DivisionMultiple Access, code division multiple access) system is subjected to the restriction of yard resource and self-interference, and then its acceptance judging mainly is whether judgement sign indicating number resource and power resource be enough.Therefore, the acceptance judging method in the cdma system can not be applicable to ofdm system.

Summary of the invention

The purpose of this invention is to provide a kind of method and device of in ofdm system, admitting control, with under the prerequisite of the Radio Resource that takes full advantage of system, access service as much as possible, and guarantee the qos requirement of current access service.

The technical problem to be solved in the present invention provides a kind of method of admitting control in ofdm system, comprising:

After receiving the admittance request, calculate to initiate business to be accessed needed up-downgoing running time-frequency resource number in the unit interval of described admittance request respectively, and judge in the unit interval should the required up-downgoing time-frequency of business number average correspondingly can use less than the up-downgoing of current system the time frequency situation under admit this business.

Further, said method also can comprise:

As judge in the unit interval time frequency that should the required down time-frequency number of business can use more than or equal to current system descending, or should business in the unit interval required when up frequency more than or equal to current system uplink can use the time during frequency, refusal inserts this business.

Further, said method also can have following feature:

According to formula ${\mathrm{DLR}}_N=\frac{\mathrm{ABR}}{{\mathrm{DLR}}_U}$ Calculate described business to be accessed needed down time-frequency number of resources in the unit interval;

Wherein, if this business to be accessed belongs to bit rate (GBR) business that guarantees, then its value that inserts bit rate (ABR) just equals the value of this professional GBR; If this business belongs to non-assurance bit rate (NGBR) business, then its ABR value equals the value of preferential bit rate (PBR);

${\mathrm{DLR}}_U=\frac{\mathrm{DLModu}\×\mathrm{REperDL}{R}_U}{\mathrm{SMFactor}\×\mathrm{\β}\×(1+\mathrm{\α})},$ Wherein: DLModu is descending average modulation code efficiency;

REperDLR _UBe a DLR _UIn the running time-frequency resource number that comprises; α is user's face processing expenditure; For the GBR business, β equals the activation of service factor of GBR business, and for the NGBR business, β equals the sending probability of NGBR business; When the value of many antenna factors SMFactor has the emission of gain at transmitting terminal, relevant with multithread probability and the number of transmit antennas of data.

Further, said method also can have following feature:

According to formula ${\mathrm{ULR}}_N=\frac{\mathrm{ABR}}{{\mathrm{ULR}}_U}$ Calculate described business to be accessed needed uplink time number in the unit interval;

Wherein, if this business to be accessed belongs to bit rate (GBR) business that guarantees, then its value that inserts bit rate (ABR) just equals the value of this professional GBR; If this business belongs to non-assurance bit rate (NGBR) business, then its ABR value equals the value of preferential bit rate (PBR);

${\mathrm{ULR}}_U=\frac{\mathrm{ULModu}\×\mathrm{REperU}{\mathrm{LR}}_U}{\mathrm{\β}\×(1+\mathrm{\α})},$ Wherein: ULModu is up average modulation code efficiency; REperULR _UBe a ULR _UIn the running time-frequency resource number that comprises; α is user's face processing expenditure; For the GBR business, β equals the activation of service factor of GBR business, and for the NGBR business, β equals the sending probability of NGBR business.

Further, said method also can have following feature:

When the value of many antenna factors SMFactor has the emission of gain at transmitting terminal, with the multithread probability of data and number of transmit antennas is relevant refers to:,

When number of transmit antennas is 1, SMFactor=1;

When transmitting antenna is 2, SMFactor=1-0.5 * TwoStreamRatio;

When number of transmit antennas is 4,

SMFactor＝1-0.25×TwoStreamRatio×FourlayerRatio-0.5×TwoStreamRatio；

Wherein, TwoStreamRatio is double-current sending probability, and FourlayerRatio is the vertical resolution probability.

Further, said method also can have following feature:

Judging described business to be accessed according to the related cells of carrying in the described admittance request that receives is GBR business or NGBR business.

The present invention also provides a kind of device of admitting control in ofdm system, comprising: information receiving module, computing module and judging module;

Described information receiving module is used for initiating calculation command to described computing module after receiving the admittance request;

Described computing module is used for calculating respectively business to be accessed needed up-downgoing running time-frequency resource number in the unit interval of initiating described admittance request after receiving described calculation command, and result of calculation is sent to described judging module;

Described judging module be used for judge in the unit interval should the required up-downgoing time-frequency of business number average correspondingly can use less than the up-downgoing of current system the time frequency situation under admit this business.

Further, said apparatus also can comprise:

Described computing module is used for according to formula ${\mathrm{DLR}}_N=\frac{\mathrm{ABR}}{{\mathrm{DLR}}_U}$ Calculate described business to be accessed needed down time-frequency number of resources in the unit interval;

Wherein, if this business to be accessed belongs to bit rate (GBR) business that guarantees, then its value that inserts bit rate (ABR) just equals the value of this professional GBR; If this business belongs to non-assurance bit rate (NGBR) business, then its ABR value equals the value of preferential bit rate (PBR);

${\mathrm{DLR}}_U=\frac{\mathrm{DLModu}\×\mathrm{REper}{\mathrm{DLR}}_U}{\mathrm{SMFactor}\×\mathrm{\β}\×(1+\mathrm{\α})},$ Wherein: DLModu is descending average modulation code efficiency; REperDLR _UBe a DLR _UIn the running time-frequency resource number that comprises; α is user's face processing expenditure; For the GBR business, β equals the activation of service factor of GBR business, and for the NGBR business, β equals the sending probability of NGBR business; When the value of many antenna factors SMFactor has the emission of gain at transmitting terminal, relevant with multithread probability and the number of transmit antennas of data;

Described measurement module is used for by measuring DLModu and REperDLR _UValue.

Further, said apparatus also can have following feature:

Described measurement module also is used for according to formula ${\mathrm{ULR}}_N=\frac{\mathrm{ABR}}{{\mathrm{ULR}}_U}$ Calculate described business to be accessed needed uplink time number in the unit interval;

${\mathrm{ULR}}_U=\frac{\mathrm{ULModu}\×\mathrm{REper}{\mathrm{ULR}}_U}{\mathrm{\β}\×(1+\mathrm{\α})},$ Wherein: ULModu is up average modulation code efficiency; REperULR _UBe a ULR _UIn the running time-frequency resource number that comprises;

Described measurement module also is used for by measuring ULModu and REperULR _UValue.

Further, said apparatus also can have following feature:

When the value of many antenna factors SMFactor has the emission of gain at transmitting terminal, with the multithread probability of data and number of transmit antennas is relevant refers to:

When number of transmit antennas is 1, SMFactor=1;

When transmitting antenna is 2, SMFactor=1-0.5 * TwoStreamRatio;

When number of transmit antennas is 4,

SMFactor＝1-0.25×TwoStreamRatio×FourlayerRatio-0.5×TwoStreamRatio；

Wherein, TwoStreamRatio is double-current sending probability, and FourlayerRatio is the vertical resolution probability.

The present invention has taken into full account numerous QoS factors such as professional time delay, packet loss, has guaranteed user's impression; When the running time-frequency resource that calculating business to be accessed will be used, be divided into up-downgoing and handle respectively, guaranteed asymmetrical transmission conditions, make application scenarios of the present invention more extensive; At down direction, because most system based on OFDM all has been used in combination multi-antenna technology as LTE, WiMAX, therefore consider that many antennas to the influence of running time-frequency resource, have also improved availability of the present invention.In conjunction with numerous factors, adopt the present invention when guaranteeing the existing quality of service that connects, to insert new business as much as possible, thereby both improved channel utilization, guaranteed the QoS of survice requirement, can also occur congested by effectively anti-locking system.

Description of drawings

Fig. 1 is for admitting the flow chart of control in ofdm system in the embodiment of the invention;

Fig. 2 is for admitting the structure drawing of device of control in ofdm system in the embodiment of the invention.

Embodiment

Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.

The basic design of the method for the invention is: after receiving the admittance request, calculate business to be accessed needed up-downgoing running time-frequency resource number in the unit interval of this request of initiation respectively, and judge in the unit interval should the required up-downgoing time-frequency of business number average correspondingly can use less than the up-downgoing of current system the time frequency situation under admit this business, namely only this business in the unit interval required down time-frequency number less than current system in the unit interval descending when available frequency and in the unit interval required when up frequency admit this business under the situation of frequency less than current system is up in the unit interval when available.

Algorithm flow may further comprise the steps as shown in Figure 1:

1, receives the request of admitting;

2, judge the type of business to be accessed: according to the related cells of carrying in the request message (as (the QoS Class Identifier of the QCI in the LTE system, the indication of QoS rank)), business is divided into the professional and professional two big classes of NGBR of GBR (Guaranteed Bit Rate guarantees bit rate); According to agreement regulation, the QoS rank be 1～4 o'clock should business be the GBR business, the QoS rank be 5～9 o'clock should business be the NGBR business;

3, determine ABR (Access Bit Rate inserts bit rate): if this business belongs to the GBR business, the value of its ABR just equals the value (dissimilar GBR business, the value difference of assurance bit rate) of this professional GBR so; If this business belongs to the NGBR business, its ABR value is relevant with User Priority and type of service so, and the ABR value equals PBR (Priority Bit Rate, preferential bit rate) value.The service access bit rate of Que Dinging has in this way been considered the multiple rank of QoS of survice, and numerous QoS factors such as length of time delay, packet loss, channel busy degree, service queue, has effectively guaranteed user experience.

4, carry out descending acceptance judging:

4.1 determine many antenna factors SMFactor: when utilizing many antennas not have the gain signal transmission, its value equals 1; Otherwise its value is relevant with multithread probability and the number of transmit antennas of data, is specially:

When there is a transmitting antenna residential quarter, SMFactor=1;

When there are two transmitting antennas the residential quarter, SMFactor=1-0.5 * TwoStreamRatio;

When there are 4 transmitting antennas the residential quarter,

SMFactor＝1-0.25×TwoStreamRatio×FourlayerRatio-0.5×TwoStreamRatio；

Wherein, TwoStreamRatio is double-current sending probability, and FourlayerRatio is the vertical resolution probability.

4.2 the down time-frequency number of resources DLR that business to be accessed will be used in the unit of account time _N:

${\mathrm{DLR}}_N=\frac{\mathrm{ABR}}{{\mathrm{DLR}}_U}---\left(1\right)$

Wherein, DLR _UBe the capacity of a down time-frequency resource, its value and relating to parameters such as type of service, Modulation order Product code Rate:

${\mathrm{DLR}}_U=\frac{\mathrm{DLModu}\×\mathrm{REper}{\mathrm{DLR}}_U}{\mathrm{SMFactor}\×\mathrm{\β}\×(1+\mathrm{\α})}---\left(2\right)$

Wherein, α is user's face processing expenditure; For the GBR business, β equals the activation of service factor of GBR business, and for the NGBR business, β equals the sending probability of NGBR business; DLModu is descending average modulation code efficiency, REperDLR _UBe a DLR _UIn the running time-frequency resource number, DLModu and REperDLR here _U-Value can be by measuring in real time.

4.3 descending acceptance judging:

DLR _N＜DLR _T-DLR _O (3)

Wherein, DLR _TBe descending available running time-frequency resource sum in the unit interval, DLR _OIt is the descending running time-frequency resource number that has taken in the unit interval.These two amounts can be by measuring in real time.

If satisfy formula (3), namely judge the required down time-frequency number of this business to be accessed in the unit interval less than current system descending can use the time during frequency, continue to carry out follow-up up-admission and adjudicate; Otherwise, exclude this business.

5, carry out the up-admission judgement:

5.1 determine many antenna factors SMFactor.Do not use multi-antenna technology owing to up, so SMFactor=1.

Count ULR 5.2 calculate the business to be accessed up running time-frequency resource that will use in the unit interval _N:

${\mathrm{ULR}}_N=\frac{\mathrm{ABR}}{{\mathrm{ULR}}_U}---\left(4\right)$

Wherein, ULR _UBe relating to parameters such as the capacity of a uplink time, its value and type of service, Modulation order Product code Rate.

${\mathrm{ULR}}_U=\frac{\mathrm{ULModu}\×\mathrm{REper}{\mathrm{ULR}}_U}{\mathrm{\β}\×(1+\mathrm{\α})}---\left(5\right)$

Wherein, the obtaining value method of α, β is with descending identical; ULModu is up average modulation code efficiency, REperULR _UBe a ULR _UIn the running time-frequency resource number that comprises.Here ULModu and REperULR _UValue can be by measuring in real time.

5.3 up-admission judgement:

ULR _N＜ULR _T-ULR _O (6)

Wherein, ULR _TBe up available running time-frequency resource sum in the unit interval, ULR _OIt is the up running time-frequency resource number that has taken in the unit interval.These two amounts can be by measuring in real time.

If satisfy formula (6), in the unit interval this business to be accessed namely judged required when up frequency less than current system uplink can use the time during frequency, then allow to insert this business; Otherwise, exclude this business.

In sum, this method provides in a kind of ofdm system the acceptance controlling method based on the running time-frequency resource number, in order to guarantee the QoS of survice requirement, this method taken into account ITU-T G.1010 in to the qos parameter of all kinds of business, with class of service refinement more, not only be confined to (Real Time, RT) professional and non real-time (Non-real time, NRT) professional two big classes in real time.Because the asymmetric characteristic of mobile communication system up-downgoing, this method is divided into up-admission judgement and descending acceptance judging with admittance, to provisional capital up and down judging to have only when the provisional capital allows to admit up and down and could insert this new business.In the 4th third-generation mobile communication system, many antennas also are a kind of means of important raising system transmissions efficient, this method has comprised many antennas to the influencing factor of running time-frequency resource in descending acceptance judging, thus when calculating running time-frequency resource closing to reality situation about using more.

The present invention also provides a kind of device of admitting control in ofdm system, as shown in Figure 2, comprising: information receiving module, computing module and judging module;

Information receiving module is used for initiating calculation command to computing module after receiving the admittance request;

Computing module is used for calculating respectively business to be accessed needed up-downgoing running time-frequency resource number in the unit interval of initiating to admit request after receiving calculation command, and result of calculation is sent to judging module;

Judging module be used for judge in the unit interval should the required up-downgoing time-frequency of business number average correspondingly can use less than the up-downgoing of current system the time frequency situation under admit this business.

In addition, also can comprise measurement module in this device;

Computing module is used for according to formula ${\mathrm{DLR}}_N=\frac{\mathrm{ABR}}{{\mathrm{DLR}}_U}$ Calculate business to be accessed needed down time-frequency number of resources in the unit interval;

Wherein, if this business to be accessed belongs to the GBR business, then the value of its ABR just equals the value of this professional GBR; If this business belongs to the NGBR business, then its ABR value equals the value of PBR;

${\mathrm{DLR}}_U=\frac{\mathrm{DLModu}\×\mathrm{REper}{\mathrm{DLR}}_U}{\mathrm{SMFactor}\×\mathrm{\β}\×(1+\mathrm{\α})},$ Wherein: DLModu is descending average modulation code efficiency; REperDLR _UBe a DLR _UIn the running time-frequency resource number that comprises; α is user's face processing expenditure; For the GBR business, β equals the activation of service factor of GBR business, and for the NGBR business, β equals the sending probability of NGBR business; When the value of many antenna factors SMFactor has the emission of gain at transmitting terminal, relevant with multithread probability and the number of transmit antennas of data, when number of transmit antennas is 1, SMFactor=1;

When transmitting antenna is 2, SMFactor=1-0.5 * TwoStreamRatio;

When number of transmit antennas is 4,

SMFactor=1-0.25 * TwoStreamRatio * FourlayerRatio-0.5 * TwoStreamRatio; In, TwoStreamRatio is double-current sending probability, FourlayerRatio is the vertical resolution probability; Measurement module is used for by measuring DLModu and REperDLR _UValue.

In addition, measurement module also is used for according to formula ${\mathrm{ULR}}_N=\frac{\mathrm{ABR}}{{\mathrm{ULR}}_U}$ Calculate business to be accessed needed uplink time number in the unit interval;

${\mathrm{ULR}}_U=\frac{\mathrm{ULModu}\×{\mathrm{REperULR}}_U}{\mathrm{\β}\×(1+\mathrm{\α})},$ Wherein: ULModu is up average modulation code efficiency; REperULR _UBe a ULR _UIn the running time-frequency resource number that comprises;

Measurement module also is used for by measuring ULModu and REperULR _UValue.

With two application examples the method for the invention further is illustrated below.

1, LTE FDD (Frequency Division Duplex, Frequency Division Duplexing (FDD)) system:

Suppose that upstream and downstream bandwidth all is 10MHz; 2 * 2 antenna configuration; Descending available running time-frequency resource adds up to 40; Up available running time-frequency resource adds up to 38; Measuring up-downgoing residue running time-frequency resource, to be 10 and up-downgoing average modulation code efficiency all be 4; Header overhead α=0.05 of user's face; Activation of service factor-beta=0.4 of GBR business; Sending probability η=0.3 of NGBR business; Symbolic number Nsymbol=7 in the up time slot, transmitting uplink data utilance Usymbol=6/7 like this.

Up-downgoing residue running time-frequency resource number can obtain by the standardized measurement process of 3GPP, and up-downgoing average modulation code efficiency can be passed through MAC (Media Access Control, media interviews control) layer period measurement and obtain.Detailed process is here just no longer set forth owing to be not the content that this method is paid close attention to.

The QCI value of supposing business to be accessed is that 6, ARP (Allocation and Retention Priority distributes and preempting priority) value is 9.

A, judgement type of service: can know that according to QCI=6 this business is the NGBR business;

B, definite speed ABR that admits: the ARP=9 that this is professional, QCI=6 just can know ABR=32kbps according to the QoS Basic Principle of Management;

C, descending acceptance judging based on running time-frequency resource comprise:

C.1, determine the value of many antenna factors SMFactor: suppose TwoStreamRatio=0.35, then SMFactor=0.825;

C.2, calculate a TTI (Transmission Time Interval, Transmission Time Interval) business to be accessed is at the descending running time-frequency resource number that will use in, in the LTE system, be referred to as RB (ResourceBlock, Resource Block) number, suppose the descending average modulation code efficiency DLModu=4 that measures, REperDLRU=120:

C.3, descending acceptance judging based on running time-frequency resource:

Since 0.237＜10, so result of calculation satisfies formula (3), therefore allow to insert this business based on running time-frequency resource descending, proceed up judgement.

D, up acceptance judging based on running time-frequency resource may further comprise the steps:

D.1, calculate in the TTI business to be accessed at the up running time-frequency resource number that will use:

ULR _N＝0.35

D.2, up acceptance judging based on running time-frequency resource:

Because 0.35＜10, so result of calculation satisfies (6), therefore up permission inserts this business based on running time-frequency resource.Because the provisional capital allows to insert this business up and down, so system can admit this NGBR business.

2, WiMAX FDD system:

Assumed condition and above-mentioned LTE system basically identical, namely upstream and downstream bandwidth all is 10MHz; 2 * 2 antenna configuration; Descending available running time-frequency resource adds up to 35 in unit interval, and up available running time-frequency resource adds up to 30; Be that 10 and up-downgoing average modulation code efficiency all are 4 through measuring in the current unit interval up-downgoing residue running time-frequency resource number average; Header overhead α=0.05 of user's face; Activation of service factor-beta=0.4 of GBR business; Sending probability η=0.3 of NGBR business.

Up-downgoing residue running time-frequency resource, up-downgoing average modulation code efficiency can obtain by period measurement.Detailed process is here just no longer set forth owing to be not the content that this method is paid close attention to.

Supposing to be accessed is nrtPS (Non-Real-Time Polling Service, a non real-time poll services) business, and the user is Silver Subscriber.

A, judgement type of service: the nrtPS business belongs to the category of NGBR business;

B, definite speed ABR that admits: just can know ABR=8kbps according to the QoS Basic Principle of Management;

C, descending acceptance judging based on running time-frequency resource comprise:

C.1, determine many antenna factors SMFactor: because descending use transmit diversity does not have rate gain, so SMFactor=1;

C.2, calculate in the TTI business to be accessed at the descending running time-frequency resource number that will use, suppose the descending average modulation code efficiency DLModu=4 that measures, REperDLRU=120:

DLR _N＝0.06

C.3, descending acceptance judging based on running time-frequency resource:

Because 0.06＜10, so checkout result satisfies formula (3), therefore descendingly allows to insert this business based on running time-frequency resource, proceeds up judgement.

D, up acceptance judging based on running time-frequency resource comprise:

D.1, calculate in the TTI business to be accessed at the up running time-frequency resource number that will use:

ULR _N＝0.09

D.2, up acceptance judging based on running time-frequency resource:

Because 0.09＜10, so result of calculation satisfies formula (6), therefore up permission inserts this business based on the running time-frequency resource number.Owing to all allow to insert this business at up-downlink direction, so system can admit this nrtPS business.

Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (6)

1. method of admitting control in ofdm system is characterized in that:

After receiving the admittance request, calculate to initiate business to be accessed needed up-downgoing running time-frequency resource number in the unit interval of described admittance request respectively, and judge in the unit interval should the required up-downgoing time-frequency of business number average correspondingly can use less than the up-downgoing of current system the time frequency situation under admit this business;

The described business to be accessed needed up-downgoing running time-frequency resource number in the unit interval of initiating described admittance request that calculates respectively comprises:

According to formula

Calculate described business to be accessed needed down time-frequency number of resources in the unit interval, according to formula

Calculate described business to be accessed needed uplink time number in the unit interval;

Wherein, if this business to be accessed belongs to bit rate (GBR) business that guarantees, then its value that inserts bit rate (ABR) just equals the value of this professional GBR; If this business belongs to non-assurance bit rate (NGBR) business, then its ABR value equals the value of preferential bit rate (PBR);

Wherein, DLR _UBe the capacity of a down time-frequency resource, ULR _UBe the capacity of a uplink time, DLModu is descending average modulation code efficiency; REperDLR _UBe a DLR _UIn the running time-frequency resource number that comprises; ULModu is up average modulation code efficiency; REperULR _UBe a ULR _UIn the running time-frequency resource number that comprises; α is user's face processing expenditure; For the GBR business, β equals the activation of service factor of GBR business, and for the NGBR business, β equals the sending probability of NGBR business; When the value of many antenna factors SMFactor has the emission of gain at transmitting terminal, relevant with multithread probability and the number of transmit antennas of data.

2. the method for claim 1 is characterized in that, also comprises:

As judge in the unit interval time frequency that should the required down time-frequency number of business can use more than or equal to current system descending, or should business in the unit interval required when up frequency more than or equal to current system uplink can use the time during frequency, refusal inserts this business.

3. the method for claim 1 is characterized in that,

When the value of many antenna factors SMFactor has the emission of gain at transmitting terminal, with the multithread probability of data and number of transmit antennas is relevant refers to:

When number of transmit antennas is 1, SMFactor=1;

When transmitting antenna is 2, SMFactor=1-0.5 * TwoStreamRatio;

When number of transmit antennas is 4,

SMFactor＝1-0.25×TwoStreamRatio×FourlayerRatio-0.5×TwoStreamRatio；

Wherein, TwoStreamRatio is double-current sending probability, and FourlayerRatio is the vertical resolution probability.

4. the method for claim 1 is characterized in that,

Judging described business to be accessed according to the related cells of carrying in the described admittance request that receives is GBR business or NGBR business.

5. a device of admitting control in ofdm system is characterized in that, comprising: information receiving module, computing module, judging module and measurement module;

Described information receiving module is used for initiating calculation command to described computing module after receiving the admittance request;

Described computing module is used for calculating respectively business to be accessed needed up-downgoing running time-frequency resource number in the unit interval of initiating described admittance request after receiving described calculation command, and result of calculation is sent to described judging module;

Described judging module be used for judge in the unit interval should the required up-downgoing time-frequency of business number average correspondingly can use less than the up-downgoing of current system the time frequency situation under admit this business;

Described measurement module is used for by measuring DLModu, REperDLR _U, ULModu and REperULR _UValue;

Described computing module also is used for according to formula

Calculate described business to be accessed needed down time-frequency number of resources in the unit interval, according to formula Calculate described business to be accessed needed uplink time number in the unit interval;

Wherein, if this business to be accessed belongs to bit rate (GBR) business that guarantees, then its value that inserts bit rate (ABR) just equals the value of this professional GBR; If this business belongs to non-assurance bit rate (NGBR) business, then its ABR value equals the value of preferential bit rate (PBR);

Wherein, DLR _UBe the capacity of a down time-frequency resource, ULR _UBe the capacity of a uplink time, DLModu is descending average modulation code efficiency; REperDLR _UBe a DLR _UIn the running time-frequency resource number that comprises; ULModu is up average modulation code efficiency; REperULR _UBe a ULR _UIn the running time-frequency resource number that comprises; α is user's face processing expenditure; For the GBR business, β equals the activation of service factor of GBR business, and for the NGBR business, β equals the sending probability of NGBR business; When the value of many antenna factors SMFactor has the emission of gain at transmitting terminal, relevant with multithread probability and the number of transmit antennas of data.

6. device as claimed in claim 5 is characterized in that,

When the value of many antenna factors SMFactor has the emission of gain at transmitting terminal, with the multithread probability of data and number of transmit antennas is relevant refers to:

When number of transmit antennas is 1, SMFactor=1;

When transmitting antenna is 2, SMFactor=1-0.5 * TwoStreamRatio;

When number of transmit antennas is 4,

SMFactor＝1-0.25×TwoStreamRatio×FourlayerRatio-0.5×TwoStreamRatio；

Wherein, TwoStreamRatio is double-current sending probability, and FourlayerRatio is the vertical resolution probability.

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