CN104159234A - Dynamic spectrum resource allocation method and system between two RATs - Google Patents

Abstract

The invention discloses a dynamic spectrum resource allocation method and system between two RATs. According to the method, a spectrum resource is divided into a fixed frequency band DB and a flexible frequency band FB; the fixed frequency band DB is allocated to two RATs statically and the flexible frequency band FB is allocated to two RATs dynamically, wherein the dynamic allocation mode comprises two modes of initiative switching and passive switching; dynamic spectrum resource allocation is performed for one time at each time interval delta t1, when the delta t2 is larger than the delta t1, the initiative switching mode is adopted, and when the delta t2 is equal to the delta t1, the passive switching mode adopted; the system comprises a dynamic spectrum allocation unit DFDU, a network monitoring and reporting unit and a spectrum configuration unit. The method and system disclosed by the invention are used under the condition that the two RATs coexist, can automatically allocate spectrums according to load conditions in the network, then balance system loads and improve the whole capacity of the system and increase the utilization ratio of spectrums.

Description

Between two RAT, carry out the method and system of dynamic spectrum resource distribution

Technical field

The invention belongs to wireless communication technology field, relate to dynamic spectrum resource and distribute, be specifically related to a kind of method and system of carrying out the distribution of dynamic spectrum resource between two RAT.

Background technology

Wireless frequency spectrum is the limited resources with economy and social value, at present mainly by unified state control with license.Research shows, in current wireless spectrum utilization, outstanding problem is that overall spectrum utilization ratio is low.By actual measurement, some frequency ranges, some local and some time frequency spectrum wretched insufficiency, as the frequency range of 2G left and right; And other frequency ranges, other local and other time frequency spectrum more than needed in a large number, if 3～4GHz frequency range utilance is only that 0.5%, 4～5GHz frequency range utilance is less than 0.3%.

Cause the main cause of above-mentioned radio-frequency spectrum problem to be the limitation of existing wireless frequency spectrum policy, and current adopted wireless frequency spectrum utilize the backwardness of technological means.Therefore, frequency spectrum policy must be readjusted according to radio traffic demand and the market demand, but to fundamentally solve Radio Spectrum Resource problem in short supply, must adopt efficient spectrum utilization technology, as multiple radio system dynamic frequency spectrum deployment and frequency spectrum share technology etc., realize multiple radio systems and share same frequency spectrum, mutually do not produce interference, thereby greatly improve the availability of frequency spectrum.Meanwhile, it is also the engine of radio traffic development that high-efficiency frequency spectrum utilizes technology, must have influence on the optimization of frequency spectrum policy.

The fixed frequency spectrum distribution method adopting at present refers to as each radio system fixed allocation frequency range, and no matter traffic carrying capacity size all can only be used oneself frequency range.This management by methods is easy, but has many drawbacks: in the time that traffic carrying capacity is large, self frequency range may be not enough, causes user's service request to be rejected; When traffic carrying capacity hour, self frequency range may be not fully utilized again, causes frequency spectrum resource waste.

Dynamic frequency spectrum deployment strategy need change existing spectrum allocation may general structure, relates to spectrum management person, although it is the fundamental means that realizes multisystem frequency spectrum share, improves the availability of frequency spectrum, realizes at present and also has certain difficulty.Therefore,, in the frequency spectrum share technology not changing under existing spectrum allocation may general structure prerequisite, become the frequency spectrum sharing method of being most possibly used widely at present.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, provide a kind of in the situation that two RAT coexist, according to the load state in each network, carry out automatically frequency spectrum reallocation, then balance sysmte load, can improve the method and system of carrying out the distribution of dynamic spectrum resource between two RAT of entire system capacity and the availability of frequency spectrum.

The object of the invention is to be achieved through the following technical solutions: the method for carrying out the distribution of dynamic spectrum resource between two RAT, frequency spectrum resource is divided into fixed frequency range DB and flexible frequency range FB, fixed frequency range DB is distributed to two RAT with static mode, flexible frequency range FB is distributed to two RAT with dynamical fashion, dynamic assignment mode comprises initiatively to be switched and two kinds of patterns of passive switching, at interval of Δ t ₁time carry out dynamic spectrum resource and distribute, Δ t ₂for the predefined initial time interval of user, Δ t ₂be decreased to gradually Δ t along with system operation ₁or recovery initial value, as Δ t ₂> Δ t ₁time, adopt initiatively switch mode, as Δ t ₂=Δ t ₁time, adopt passive switch mode.

Described RAT is GSM, UMTS or LTE.

Described RAT comprises following four kinds of running statuses:

State 1: only use fixed frequency range DB;

State 2: simultaneously use fixed frequency range DB and flexible frequency range FB;

State 3: flexible configuration frequency range FB;

State 4: discharge flexible frequency range FB.

Further, when described active switch mode starts, flexible frequency range FB has been distributed to RAT 2, thus RAT 2 in state 2, and 1 of RAT uses fixed frequency range DB, so RAT 1 is in state 1; Initiatively switch mode comprises the following steps:

S11: the state that detects RAT 1: whether the available resources quantity KPI that first detects RAT 1 is larger than threshold value Γ, and the computational methods of threshold value Γ are:

$\mathrm{\Γ}=R_N^{\mathrm{avg}}*\mathrm{\Δ}{t}_2*{\mathrm{\λ}}_N^{\mathrm{eff}}$

Wherein, R _n ^avgbe illustrated in the minimum resources quantity that user is required in RAT N, λ _n ^effrepresent the effective reach of RAT N, the effective reach=arrival rate-rate of leaving away, threshold value Γ is illustrated in time interval Δ t ₂in the required minimum resources quantity of RAT N;

If KPI >=Γ, returns by the time and detects and start, if KPI < is Γ next time, judge whether intrasystem timer is zero entirely, if be not zero entirely, return until detect and start next time, if timer all makes zero, carry out next step;

S12: computational load discriminant function U, the effect of load judgment function U is, after flexible frequency range FB is redistributed in judgement, whether to have effect to improving overall load:

$U=L_k=L_j-(L_k^{\mathrm{fut}}+L_j^{\mathrm{fut}})$

Wherein, L _krepresent the present relative load of RAT k, the frequency spectrum resource using now and the ratio of overall spectrum resource, L _k ^futrepresent that RAT k is in the relative load of carrying out after flexible frequency range FB heavily distributes, k represents the RAT of current operation, j represents now using the RAT of flexible frequency range FB, U>=0 represents to contribute to alleviate overall load after the flexible frequency range FB of exchange, carry out next step, U<0 can increase the weight of overall load after representing to exchange flexible frequency range FB, adopts reducing △t ₂mode upgrade the threshold value Γ of KPI, then wait for next time and detect and start;

S13: whether the resource quantity that judges the fixed frequency range DB of RAT2 enough provides the user in the flexible frequency range FB of RAT2 at present to use, if can not provide, directly returns, if can provide, carries out next step operation;

S14: judge whether flexible frequency range FB closes new user, if do not closed, closes flexible frequency range FB, make it no longer open to new user, start timer simultaneously and guarantee that flexible frequency range FB closes, then return until detect and start next time, if frequency range FB closes flexibly, the threshold value of resetting Γ, make it become initial value, the state of RAT2 is set to state 4, again the user of RAT2 is transferred in fixed frequency range DB and gone, then the state of RAT2 is set to state 1, RAT2 has shifted all users and has discharged flexible frequency range FB later, the state of RAT1 is set to state 3 simultaneously, flexible configuration frequency range FB relevant parameter, and be applied in each RAT base station, guarantee that flexible frequency range FB is correctly configured, configure flexible frequency range FB and start at once a timer later, the effect of this timer is in order to prevent ping-pong, prevent that flexible frequency range FB from switching back and forth between two RAT, after having started timer, the state of this RAT 1 is set to state 2, initiatively switch.

Further, when described passive switch mode starts, represent that RAT 1 has overloaded, passive switch mode comprises the following steps:

S21: whether the available resources quantity KPI that first detects RAT1 is larger than threshold value Γ, if KPI >=Γ, return by the time and detect and start next time, if KPI < is Γ, judge whether intrasystem timer is zero entirely, if be not zero entirely, return until detect and start next time, if timer all makes zero, carry out next step;

S22: judge that whether the idling-resource in the fixed frequency range DB of RAT2 is large enough to hold user and the following new user on the horizon in flexible frequency range FB, if not, returns until detect and start next time; If enough, judge whether flexible frequency range FB closes, if do not closed, new user is closed to flexible frequency range FB, start timer simultaneously and ensure closing smoothly of flexible frequency range FB, then return until detect and start next time, if frequency range FB closes flexibly, carry out next step;

S23: whether the blocking rate that judges RAT1 is greater than critical value, if blocking rate is less than critical value, returns until detection next time starts, if blocking rate is greater than critical value, gathers the related data of computational load discriminant function U and calculates U value:

$U=(L_1+{\mathrm{\&theta;}}_1+L_2+{\mathrm{\&theta;}}_2)-(L_1^{\mathrm{fut}}+{\mathrm{\&theta;}}_1^{\mathrm{fut}}+L_2^{\mathrm{fut}}+{\mathrm{\&theta;}}_2^{\mathrm{fut}})$

Wherein, θ _krefer to overload in RAT k, overload is when referring to current RAT load and being 100%, still has user to access, and the required resource of these users is the amount of current RAT overload, θ _k ^futrefer to the overload in RAT k after the flexible frequency range FB of exchange,

Wherein θ ₁ ^futcan be in order to lower the Representation Equation:

${\mathrm{\&theta;}}_1^{\mathrm{fut}}=\frac{{\mathrm{\&theta;}}_1*R_1^{\mathrm{total}}+\mathrm{\&Delta;}{t}^{\mathrm{fut}}*{\mathrm{\&lambda;}}_1*R_1^{\mathrm{avg}}-R_1^{\mathrm{free}}}{R_1^{\mathrm{total}\_\mathrm{fut}}}$

R ₁ ^totalrepresent the frequency spectrum resource total amount that current RAT 1 is all, Δ t ^futrepresent the time interval, R ₁ ^freerepresent the idle frequency spectrum resource of current RAT 1, R ₁ ^total_futrepresent through Δ t ^futthe frequency spectrum resource total amount of RAT 1 after time, λ ₁represent the validated user arrival rate of RAT 1, R ₁ ^avgrepresent the lowest frequency spectrum resource amount of single user's request of RAT 1.

θ ₂ ^futcan be in order to lower the Representation Equation:

${\mathrm{\&theta;}}_2^{\mathrm{fut}}=\frac{{\mathrm{\&theta;}}_2*R_2^{\mathrm{total}}+\mathrm{\&Delta;}{t}^{\mathrm{fut}}*{\mathrm{\&lambda;}}_2*R_2^{\mathrm{avg}}+N^{\mathrm{flex}}*R_2^{\mathrm{avg}}-R_2^{\mathrm{free}}}{R_2^{\mathrm{total}\_\mathrm{fut}}}$

Wherein, R ₂ ^totalrepresent the frequency spectrum resource total amount that current RAT 2 is all, Δ t ^futrepresent the time interval, R ₂ ^freerepresent the idle frequency spectrum resource of current RAT2, R ₂ ^total_futrepresent through Δ t ^futthe frequency spectrum resource total amount of RAT 2 after time, λ ₂represent the validated user arrival rate of RAT 2, R ₂ ^avgrepresent the lowest frequency spectrum resource amount of single user's request of RAT 2, N ^flexrepresent the number of users of flexible frequency range; If U>=0, carries out next step, otherwise return immediately until detect and start next time;

S24: replacement threshold value Γ, make it become initial value, the state of RAT2 is set to state 4, again the user of RAT2 is transferred in fixed frequency range DB and gone, the state of RAT2 is set to state 1, after RAT2 has shifted all users, discharge flexible frequency range FB, accepted the resource of flexible frequency range FB by RAT1 before, the state of this RAT1 is set to state 3 simultaneously, while flexible configuration frequency range FB relevant parameter is also applied in each RAT base station, guarantee that flexible frequency range FB is correctly configured, after configuring FB, just start at once a timer, the effect of this timer is in order to prevent ping-pong, prevent that FB from switching back and forth between two RAT, after having started timer, the state of this RAT is set to state 2, passive switching completes.

In described dynamic spectrum resource allocation process, adopt altogether two class counters, a class counter is used for guaranteeing that flexible spectrum section FB closes new user, and another kind of timer is used for preventing ping-pong.

For addressing the above problem, the present invention also provides a kind of system of carrying out the distribution of dynamic spectrum resource between two RAT, and comprise dynamic frequency spectrum deployment cells D FDU, network monitoring and report unit, spectrum disposition unit, wherein:

Dynamic frequency spectrum deployment cells D FDU has been used for the initial work of spectrum disposition, and receive from the network monitoring of different RAT and report the reporting information of unit, and the frequency allocation plan that judges whether to carry out frequency spectrum reallocation and determine each RAT by the reporting information receiving, then spectrum allocation schemes is assigned to the spectrum disposition unit to each RAT inside;

Network monitoring and report unit for the real-time state information of monitoring RAT inside, and by the information reporting of collecting to dynamic frequency spectrum deployment cells D FDU;

Spectrum disposition unit is for receiving from the spectrum allocation schemes of dynamic frequency spectrum deployment cells D FDU and carrying out frequency spectrum reallocation by this scheme.

The initialization information of described spectrum disposition comprises the configuration mode of current network, comprises each RAT intrinsic frequency range DB separately and public flexible frequency range FB.

Particularly, the state information of described RAT inside but be not limited to: the historical arrival rate of customers of the suffered disturbance regime of network load information, number of network users, network available resources quantity, current network, current network with leave away rate and the frequency spectrum resource of each user's mean consumption.

Further, described dynamic frequency spectrum deployment cells D FDU comprises initialization module, strategy operation module, reporting information receiver module and spectrum disposition release module, wherein:

Initialization module is for receiving the initial spectrum configuration information that configured in advance is good, comprise the assignment information of intrinsic frequency range DB and flexible frequency range FB, intrinsic frequency range DB comprises the basis deployment frequency range size of each RAT, and frequency range FB comprises which RAT frequency range size and initial frequency range FB flexibly that three can use jointly distribute to flexibly;

Reporting information receiver module is for receiving the state information reporting from each RAT, and the state information that these are reported is given strategy operation module;

Strategy operation module for decide frequency allocation plan according to the state information of receiving and by concrete spectrum disposition communication to spectrum disposition release module;

Spectrum disposition release module is for being distributed to each RAT by concrete spectrum disposition information.

The invention has the beneficial effects as follows: frequency spectrum resource is divided into fixed frequency range and flexible frequency range, fixed frequency range is distributed to two RAT with static mode, flexible frequency range is given to two RAT with dynamical fashion, dynamic assignment mode comprises initiatively to be switched and two kinds of patterns of passive switching, by network monitoring with report unit for the state information of real-time monitoring RAT inside and be sent to DFDU, DFDU judges whether to reallocate and definite frequency spectrum reassignment method, and assignment information is distributed to the spectrum disposition unit enforcement spectrum allocation may of each RAT inside.Method and system of the present invention, in the situation that two RAT coexist, after carrying out initialization, according to the load state in each network, carries out frequency spectrum reallocation automatically, and then balance sysmte load, can improve entire system capacity and the availability of frequency spectrum.

Brief description of the drawings

Fig. 1 is the running status transition diagram of RAT of the present invention;

Fig. 2 is active switch mode flow chart of the present invention;

Fig. 3 is passive switching flow figure of the present invention;

Fig. 4 is the system configuration module map that dynamic spectrum resource of the present invention is distributed;

Fig. 5 is the construction module figure of dynamic frequency spectrum deployment cells D FDU of the present invention.

Embodiment

Further illustrate technical scheme of the present invention below in conjunction with accompanying drawing, but the content that the present invention protects is not limited to the following stated.

The invention provides a kind of dynamic spectrum resource allocation methods and system, specifically frequency spectrum resource is divided into fixed frequency range and flexible frequency range, fixed frequency range is used for ensureing certain radio network technique (Radio Access Technology, RAT) basic business and basis cover, and frequency range is as all spendable shared bands of multiple RAT flexibly.Fixed frequency range in above-mentioned frequency spectrum resource is distributed to two RAT (RAT can be GSM, UMTS or LTE) with static mode, and flexible frequency range is given to two RAT with dynamical fashion.Dynamic frequency spectrum deployment unit (DFDU, Dynamic Frequency Distributing Unit) is for judging whether each RAT can obtain flexible frequency range and flexible frequency range is distributed to deployment.DFDU judges and distributed by this distribution method, and assignment information is distributed to behind the spectrum disposition unit of each RAT inside, implements spectrum allocation may by the spectrum disposition unit of RAT inside.Method and system of the present invention, for dynamic assignment radio spectrum resources in the situation that two RAT coexist, balance sysmte load, improves entire system capacity.Specifically describe as follows:

The present embodiment provides a kind of method of carrying out the distribution of dynamic spectrum resource between two RAT, frequency spectrum resource is divided into fixed frequency range DB and flexible frequency range FB, fixed frequency range DB is distributed to two RAT with static mode, flexible frequency range FB is distributed to two RAT with dynamical fashion, dynamic assignment mode comprises initiatively to be switched and two kinds of patterns of passive switching, at interval of Δ t ₁time carry out dynamic spectrum resource and distribute, Δ t ₂for the predefined initial time interval of user, Δ t ₂be decreased to gradually Δ t along with system operation ₁or recovery initial value, as Δ t ₂> Δ t ₁time, adopt initiatively switch mode, as Δ t ₂=Δ t ₁time, adopt passive switch mode, wherein, Δ t ₁, Δ t ₂for predefined two time intervals of user.

Described RAT is GSM, UMTS or LTE.

As shown in Figure 1, described RAT comprises following four kinds of running statuses:

State 1: only use fixed frequency range DB;

State 2: simultaneously use fixed frequency range DB and flexible frequency range FB;

State 3: flexible configuration frequency range FB;

State 4: discharge flexible frequency range FB.

As shown in Figure 2, when described active switch mode starts, flexible frequency range FB has been distributed to RAT 2, thus RAT2 in state 2, and 1 of RAT uses fixed frequency range DB, so RAT 1 is in state 1; Initiatively switch mode comprises the following steps:

S11: the state that detects RAT 1: whether the available resources quantity KPI that first detects RAT 1 is larger than threshold value Γ, and the computational methods of threshold value Γ are:

$\mathrm{\&Gamma;}=R_N^{\mathrm{avg}}*\mathrm{\&Delta;}{t}_2*{\mathrm{\&lambda;}}_N^{\mathrm{eff}}$

Wherein, R _n ^avgbe illustrated in the minimum resources quantity that user is required in RAT N, λ _n ^effrepresent the effective reach of RAT N, the effective reach=arrival rate-rate of leaving away, threshold value Γ is illustrated in time interval Δ t ₂in the required minimum resources quantity of RAT N;

If KPI >=Γ, returns by the time and detects and start, if KPI < is Γ next time, judge whether intrasystem timer is zero entirely, if be not zero entirely, return until detect and start next time, if timer all makes zero, carry out next step;

S12: computational load discriminant function U, the effect of load judgment function U is, after flexible frequency range FB is redistributed in judgement, whether to have effect to improving overall load:

$U=L_k=L_j-(L_k^{\mathrm{fut}}+L_j^{\mathrm{fut}})$

Wherein, L _krepresent the present relative load of RAT k, the frequency spectrum resource using now and the ratio of overall spectrum resource, L _k ^futrepresent that RAT k is in the relative load of carrying out after flexible frequency range FB heavily distributes, k represents the RAT of current operation, j represents now using the RAT of flexible frequency range FB, U>=0 represents to contribute to alleviate overall load after the flexible frequency range FB of exchange, carry out next step, U<0 can increase the weight of overall load after representing to exchange flexible frequency range FB, adopts reducing △t ₂mode upgrade the threshold value Γ of KPI, then wait for next time and detect and start;

S13: whether the resource quantity that judges the fixed frequency range DB of RAT2 enough provides the user in the flexible frequency range FB of RAT2 at present to use, if can not provide, directly returns, if can provide, carries out next step operation;

S14: judge whether flexible frequency range FB closes new user, if do not closed, closes flexible frequency range FB, make it no longer open to new user, start timer simultaneously and guarantee that flexible frequency range FB closes, then return until detect and start next time, if frequency range FB closes flexibly, the threshold value of resetting Γ, make it become initial value, the state of RAT2 is set to state 4, again the user of RAT2 is transferred in fixed frequency range DB and gone, then the state of RAT2 is set to state 1, RAT2 has shifted all users and has discharged flexible frequency range FB later, the state of RAT1 is set to state 3 simultaneously, flexible configuration frequency range FB relevant parameter, and be applied in each RAT base station, guarantee that flexible frequency range FB is correctly configured, configure flexible frequency range FB and start at once a timer later, the effect of this timer is in order to prevent ping-pong, prevent that flexible frequency range FB from switching back and forth between two RAT, after having started timer, the state of this RAT 1 is set to state 2, initiatively switch.

Further as shown in Figure 3, when described passive switch mode starts, represent that RAT 1 has overloaded, passive switch mode comprises the following steps:

S21: whether the available resources quantity KPI that first detects RAT1 is larger than threshold value Γ, if KPI >=Γ, return by the time and detect and start next time, if KPI < is Γ, judge whether intrasystem timer is zero entirely, if be not zero entirely, return until detect and start next time, if timer all makes zero, carry out next step;

S22: judge that whether the idling-resource in the fixed frequency range DB of RAT2 is large enough to hold user and the following new user on the horizon in flexible frequency range FB, if not, returns until detect and start next time; If enough, judge whether flexible frequency range FB closes, if do not closed, new user is closed to flexible frequency range FB, start timer simultaneously and ensure closing smoothly of flexible frequency range FB, then return until detect and start next time, if frequency range FB closes flexibly, carry out next step;

S23: whether the blocking rate that judges RAT1 is greater than critical value, if blocking rate is less than critical value, returns until detection next time starts, if blocking rate is greater than critical value, gathers the related data of computational load discriminant function U and calculates U value:

$U=(L_1+{\mathrm{\&theta;}}_1+L_2+{\mathrm{\&theta;}}_2)-(L_1^{\mathrm{fut}}+{\mathrm{\&theta;}}_1^{\mathrm{fut}}+L_2^{\mathrm{fut}}+{\mathrm{\&theta;}}_2^{\mathrm{fut}})$

Wherein, θ _krefer to overload in RAT k, overload is when referring to current RAT load and being 100%, still has user to access, and the required resource of these users is the amount of current RAT overload, θ _k ^futrefer to the overload in RAT k after the flexible frequency range FB of exchange,

Wherein θ ₁ ^futcan be in order to lower the Representation Equation:

${\mathrm{\&theta;}}_1^{\mathrm{fut}}=\frac{{\mathrm{\&theta;}}_1*R_1^{\mathrm{total}}+\mathrm{\&Delta;}{t}^{\mathrm{fut}}*{\mathrm{\&lambda;}}_1*R_1^{\mathrm{avg}}-R_1^{\mathrm{free}}}{R_1^{\mathrm{total}\_\mathrm{fut}}}$

R ₁ ^totalrepresent the frequency spectrum resource total amount that current RAT 1 is all, Δ t ^futrepresent the time interval, R ₁ ^freerepresent the idle frequency spectrum resource of current RAT 1, R ₁ ^total_futrepresent through Δ t ^futthe frequency spectrum resource total amount of RAT 1 after time, λ ₁represent the validated user arrival rate of RAT 1, R ₁ ^avgrepresent the lowest frequency spectrum resource amount of single user's request of RAT 1.

θ ₂ ^futcan be in order to lower the Representation Equation:

${\mathrm{\&theta;}}_2^{\mathrm{fut}}=\frac{{\mathrm{\&theta;}}_2*R_2^{\mathrm{total}}+\mathrm{\&Delta;}{t}^{\mathrm{fut}}*{\mathrm{\&lambda;}}_2*R_2^{\mathrm{avg}}+N^{\mathrm{flex}}*R_2^{\mathrm{avg}}-R_2^{\mathrm{free}}}{R_2^{\mathrm{total}\_\mathrm{fut}}}$

Wherein, R ₂ ^totalrepresent the frequency spectrum resource total amount that current RAT 2 is all, Δ t ^futrepresent the time interval, R ₂ ^freerepresent the idle frequency spectrum resource of current RAT2, R ₂ ^total_futrepresent through Δ t ^futthe frequency spectrum resource total amount of RAT 2 after time, λ ₂represent the validated user arrival rate of RAT 2, R ₂ ^avgrepresent the lowest frequency spectrum resource amount of single user's request of RAT 2, N ^flexrepresent the number of users of flexible frequency range; If U>=0, carries out next step, otherwise return immediately until detect and start next time;

S24: replacement threshold value Γ, make it become initial value, the state of RAT2 is set to state 4, again the user of RAT2 is transferred in fixed frequency range DB and gone, the state of RAT2 is set to state 1, after RAT2 has shifted all users, discharge flexible frequency range FB, accepted the resource of flexible frequency range FB by RAT1 before, the state of this RAT1 is set to state 3 simultaneously, while flexible configuration frequency range FB relevant parameter is also applied in each RAT base station, guarantee that flexible frequency range FB is correctly configured, after configuring FB, just start at once a timer, the effect of this timer is in order to prevent ping-pong, prevent that FB from switching back and forth between two RAT, after having started timer, the state of this RAT is set to state 2, passive switching completes.

In described dynamic spectrum resource allocation process, adopt altogether two class counters, a class counter is used for guaranteeing that flexible spectrum section FB closes new user, and another kind of timer is used for preventing ping-pong.

As shown in Figure 4, the present embodiment also provides a kind of system of carrying out the distribution of dynamic spectrum resource between two RAT, comprise dynamic frequency spectrum deployment cells D FDU (Dynamic Frequency Distributing Unit), network monitoring and report unit, spectrum disposition unit, wherein:

Dynamic frequency spectrum deployment cells D FDU has been used for the initial work of spectrum disposition, and receive from the network monitoring of different RAT and report the reporting information of unit, and the frequency allocation plan that judges whether to carry out frequency spectrum reallocation and determine each RAT by the reporting information receiving, then spectrum allocation schemes is assigned to the spectrum disposition unit to each RAT inside;

Network monitoring and report unit for the real-time state information of monitoring RAT inside, and the information exchange of collecting is crossed to interface report dynamic frequency spectrum deployment cells D FDU;

Spectrum disposition unit is for receiving from the spectrum allocation schemes of dynamic frequency spectrum deployment cells D FDU and carrying out frequency spectrum reallocation by this scheme, comprising the wavelength coverage of required configuration, need the wavelength coverage discharging, the disturbance regime that other networks are suffered, by the combination of one or more information of above information.

The initialization information of described spectrum disposition comprises the configuration mode of current network, comprises each RAT intrinsic frequency range DB separately and public flexible frequency range FB.

Particularly, the state information of described RAT inside but be not limited to: the historical arrival rate of customers of the suffered disturbance regime of network load information, number of network users, network available resources quantity, current network, current network with leave away rate and the frequency spectrum resource of each user's mean consumption.

As shown in Figure 5, described dynamic frequency spectrum deployment cells D FDU comprises initialization module, strategy operation module, reporting information receiver module and spectrum disposition release module, wherein:

Initialization module is for receiving the initial spectrum configuration information that configured in advance is good, comprise the assignment information of intrinsic frequency range DB and flexible frequency range FB, intrinsic frequency range DB comprises the basis deployment frequency range size of each RAT, and frequency range FB comprises which RAT frequency range size and initial frequency range FB flexibly that three can use jointly distribute to flexibly;

Reporting information receiver module is for receiving the state information reporting from each RAT, and the state information that these are reported is given strategy operation module;

Strategy operation module for decide frequency allocation plan according to the state information of receiving and by concrete spectrum disposition communication to spectrum disposition release module;

Spectrum disposition release module is for being distributed to each RAT by concrete spectrum disposition information.

The present invention first distributed a priority to different RAT before dynamic spectrum resource is distributed, and the RAT that priority is high will preferentially obtain dynamic spectrum resource, and the concrete size of priority is determined by implementer.After flexible frequency range FB has been carried out to reallocation, also can there is corresponding variation in the residing state of each wireless network RAT, therefore before distributing, first characterize and switch back loading situation of change by computational load discriminant function U, U >=0 represents to contribute to alleviate overall load after the flexible frequency range FB of exchange, implement allocation strategy, U<0 can increase the weight of overall load after representing to exchange flexible frequency range FB, does not carry out dynamic assignment.

Claims (10)

1. between two RAT, carry out the method for dynamic spectrum resource distribution, it is characterized in that: frequency spectrum resource is divided into fixed frequency range DB and flexible frequency range FB, fixed frequency range DB is distributed to two RAT with static mode, flexible frequency range FB is distributed to two RAT with dynamical fashion, dynamic assignment mode comprises initiatively to be switched and two kinds of patterns of passive switching, at interval of Δ t ₁time carry out dynamic spectrum resource and distribute, Δ t ₂for the predefined initial time interval of user, Δ t ₂be decreased to gradually Δ t along with system operation ₁or recovery initial value, as Δ t ₂> Δ t ₁time, adopt initiatively switch mode, as Δ t ₂=Δ t ₁time, adopt passive switch mode.

2. method of carrying out the distribution of dynamic spectrum resource between two RAT according to claim 1, is characterized in that: described RAT is GSM, UMTS or LTE.

3. method of carrying out the distribution of dynamic spectrum resource between two RAT according to claim 2, is characterized in that: described RAT comprises following four kinds of running statuses:

State 1: only use fixed frequency range DB;

State 2: simultaneously use fixed frequency range DB and flexible frequency range FB;

State 3: flexible configuration frequency range FB;

State 4: discharge flexible frequency range FB.

4. method of carrying out the distribution of dynamic spectrum resource between two RAT according to claim 3, it is characterized in that: when described active switch mode starts, flexible frequency range FB has been distributed to RAT2, so RAT2 is in state 2, and RAT1 only uses fixed frequency range DB, so RAT1 is in state 1; Initiatively switch mode comprises the following steps:

S11: the state that detects RAT1: whether the available resources quantity KPI that first detects RAT1 is larger than threshold value Γ, and the computational methods of threshold value Γ are:

$\mathrm{\&Gamma;}=R_N^{\mathrm{avg}}*\mathrm{\&Delta;}{t}_2*{\mathrm{\&lambda;}}_N^{\mathrm{eff}}$

Wherein, R _n ^avgbe illustrated in the minimum resources quantity that user is required in RAT N, λ _n ^effrepresent the effective reach of RAT N, the effective reach=arrival rate-rate of leaving away, threshold value Γ is illustrated in time interval Δ t ₂in the required minimum resources quantity of RAT N;

If KPI >=Γ, returns by the time and detects and start, if KPI < is Γ next time, judge whether intrasystem timer is zero entirely, if be not zero entirely, return until detect and start next time, if timer all makes zero, carry out next step;

S12: computational load discriminant function U, the effect of load judgment function U is, after flexible frequency range FB is redistributed in judgement, whether to have effect to improving overall load:

$U=L_k=L_j-(L_k^{\mathrm{fut}}+L_j^{\mathrm{fut}})$

Wherein, L _krepresent the present relative load of RAT k, the frequency spectrum resource using now and the ratio of overall spectrum resource, L _k ^futrepresent that RAT k is in the relative load of carrying out after flexible frequency range FB heavily distributes, k represents the RAT of current operation, j represents now using the RAT of flexible frequency range FB, U>=0 represents to contribute to alleviate overall load after the flexible frequency range FB of exchange, carry out next step, U<0 can increase the weight of overall load after representing to exchange flexible frequency range FB, adopts reducing △t ₂mode upgrade the threshold value Γ of KPI, then wait for next time and detect and start;

S13: whether the resource quantity that judges the fixed frequency range DB of RAT2 enough provides the user in the flexible frequency range FB of RAT2 at present to use, if can not provide, directly returns, if can provide, carries out next step operation;

S14: judge whether flexible frequency range FB closes new user, if do not closed, closes flexible frequency range FB, make it no longer open to new user, start timer simultaneously and guarantee that flexible frequency range FB closes, then return until detect and start next time, if frequency range FB closes flexibly, the threshold value of resetting Γ, make it become initial value, the state of RAT2 is set to state 4, again the user of RAT2 is transferred in fixed frequency range DB and gone, then the state of RAT2 is set to state 1, RAT2 has shifted all users and has discharged flexible frequency range FB later, the state of RAT1 is set to state 3 simultaneously, flexible configuration frequency range FB relevant parameter, and be applied in each RAT base station, guarantee that flexible frequency range FB is correctly configured, configure flexible frequency range FB and start at once a timer later, the effect of this timer is in order to prevent ping-pong, prevent that flexible frequency range FB from switching back and forth between two RAT, after having started timer, the state of this RAT1 is set to state 2, initiatively switch.

5. method of carrying out the distribution of dynamic spectrum resource between two RAT according to claim 3, is characterized in that: when described passive switch mode starts, represent that RAT1 overloads, passive switch mode comprises the following steps:

S21: whether the available resources quantity KPI that first detects RAT1 is larger than threshold value Γ, if KPI >=Γ, return by the time and detect and start next time, if KPI < is Γ, judge whether intrasystem timer is zero entirely, if be not zero entirely, return until detect and start next time, if timer all makes zero, carry out next step;

S22: judge that whether the idling-resource in the fixed frequency range DB of RAT2 is large enough to hold user and the following new user on the horizon in flexible frequency range FB, if not, returns until detect and start next time; If enough, judge whether flexible frequency range FB closes, if do not closed, new user is closed to flexible frequency range FB, start timer simultaneously and ensure closing smoothly of flexible frequency range FB, then return until detect and start next time, if frequency range FB closes flexibly, carry out next step;

S23: whether the blocking rate that judges RAT1 is greater than critical value, if blocking rate is less than critical value, returns until detection next time starts, if blocking rate is greater than critical value, gathers the related data of computational load discriminant function U and calculates U value:

$U=(L_1+{\mathrm{\&theta;}}_1+L_2+{\mathrm{\&theta;}}_2)-(L_1^{\mathrm{fut}}+{\mathrm{\&theta;}}_1^{\mathrm{fut}}+L_2^{\mathrm{fut}}+{\mathrm{\&theta;}}_2^{\mathrm{fut}})$

Wherein, θ _krefer to overload in RAT k, overload is when referring to current RAT load and being 100%, still has user to access, and the required resource of these users is the amount of current RAT overload, θ _k ^futrefer to the overload in RAT k after the flexible frequency range FB of exchange,

Wherein θ ₁ ^futcan be in order to lower the Representation Equation:

${\mathrm{\&theta;}}_1^{\mathrm{fut}}=\frac{{\mathrm{\&theta;}}_1*R_1^{\mathrm{total}}+\mathrm{\&Delta;}{t}^{\mathrm{fut}}*{\mathrm{\&lambda;}}_1*R_1^{\mathrm{avg}}-R_1^{\mathrm{free}}}{R_1^{\mathrm{total}\_\mathrm{fut}}}$

R ₁ ^totalrepresent the frequency spectrum resource total amount that current RAT 1 is all, Δ t ^futrepresent the time interval, R ₁ ^freerepresent the idle frequency spectrum resource of current RAT 1, R ₁ ^total_futrepresent through Δ t ^futthe frequency spectrum resource total amount of RAT 1 after time, λ ₁represent the validated user arrival rate of RAT 1, R ₁ ^avgrepresent the lowest frequency spectrum resource amount of single user's request of RAT 1.

θ ₂ ^futcan be in order to lower the Representation Equation:

${\mathrm{\&theta;}}_2^{\mathrm{fut}}=\frac{{\mathrm{\&theta;}}_2*R_2^{\mathrm{total}}+\mathrm{\&Delta;}{t}^{\mathrm{fut}}*{\mathrm{\&lambda;}}_2*R_2^{\mathrm{avg}}+N^{\mathrm{flex}}*R_2^{\mathrm{avg}}-R_2^{\mathrm{free}}}{R_2^{\mathrm{total}\_\mathrm{fut}}}$

Wherein, R ₂ ^totalrepresent the frequency spectrum resource total amount that current RAT 2 is all, Δ t ^futrepresent the time interval, R ₂ ^freerepresent the idle frequency spectrum resource of current RAT2, R ₂ ^total_futrepresent through Δ t ^futthe frequency spectrum resource total amount of RAT 2 after time, λ ₂represent the validated user arrival rate of RAT 2, R ₂ ^avgrepresent the lowest frequency spectrum resource amount of single user's request of RAT 2, N ^flexrepresent the number of users of flexible frequency range; If U>=0, carries out next step, otherwise return immediately until detect and start next time;

S24: replacement threshold value Γ, make it become initial value, the state of RAT2 is set to state 4, again the user of RAT2 is transferred in fixed frequency range DB and gone, the state of RAT2 is set to state 1, after RAT2 has shifted all users, discharge flexible frequency range FB, accepted the resource of flexible frequency range FB by RAT1 before, the state of this RAT1 is set to state 3 simultaneously, while flexible configuration frequency range FB relevant parameter is also applied in each RAT base station, guarantee that flexible frequency range FB is correctly configured, after configuring FB, just start at once a timer, the effect of this timer is in order to prevent ping-pong, prevent that FB from switching back and forth between two RAT, after having started timer, the state of this RAT is set to state 2, passive switching completes.

6. according to the method for carrying out the distribution of dynamic spectrum resource between two RAT described in claim 4 or 5, it is characterized in that: in described dynamic spectrum resource allocation process, adopt altogether two class counters, one class counter is used for guaranteeing that flexible spectrum section FB closes new user, and another kind of timer is used for preventing ping-pong.

7. the system of carrying out the distribution of dynamic spectrum resource between two RAT, is characterized in that: comprises dynamic frequency spectrum deployment cells D FDU, network monitoring and reports unit, spectrum disposition unit, wherein:

Dynamic frequency spectrum deployment cells D FDU has been used for the initial work of spectrum disposition, and receive from the network monitoring of different RAT and report the reporting information of unit, and the frequency allocation plan that judges whether to carry out frequency spectrum reallocation and determine each RAT by the reporting information receiving, then spectrum allocation schemes is assigned to the spectrum disposition unit to each RAT inside;

Network monitoring and report unit for the real-time state information of monitoring RAT inside, and by the information reporting of collecting to dynamic frequency spectrum deployment cells D FDU;

Spectrum disposition unit is for receiving from the spectrum allocation schemes of dynamic frequency spectrum deployment cells D FDU and carrying out frequency spectrum reallocation by this scheme.

8. system of carrying out the distribution of dynamic spectrum resource between two RAT according to claim 7, it is characterized in that: the initialization information of described spectrum disposition comprises the configuration mode of current network, comprise each RAT intrinsic frequency range DB separately and public flexible frequency range FB.

9. system of carrying out the distribution of dynamic spectrum resource between two RAT according to claim 7, it is characterized in that: the state information of described RAT inside but be not limited to: the historical arrival rate of customers of the suffered disturbance regime of network load information, number of network users, network available resources quantity, current network, current network with leave away rate and the frequency spectrum resource of each user's mean consumption.

10. system of carrying out the distribution of dynamic spectrum resource between two RAT according to claim 8, it is characterized in that: described dynamic frequency spectrum deployment cells D FDU comprises initialization module, strategy operation module, reporting information receiver module and spectrum disposition release module, wherein:

Initialization module is for receiving the initial spectrum configuration information that configured in advance is good, comprise the assignment information of intrinsic frequency range DB and flexible frequency range FB, intrinsic frequency range DB comprises the basis deployment frequency range size of each RAT, and frequency range FB comprises which RAT frequency range size and initial frequency range FB flexibly that three can use jointly distribute to flexibly;

Reporting information receiver module is for receiving the state information reporting from each RAT, and the state information that these are reported is given strategy operation module;

Strategy operation module for decide frequency allocation plan according to the state information of receiving and by concrete spectrum disposition communication to spectrum disposition release module;

Spectrum disposition release module is for being distributed to each RAT by concrete spectrum disposition information.