CN103024847B - Method for time division long term evolution (TD-LTE) femtocell admission control - Google Patents

Abstract

The invention discloses a method for time division long term evolution (TD-LTE) femtocell admission control. Through user admission and authentication, according to the current working mode of femtocell, a user is authenticated and an access threshold of the user is determined; through a wireless admission strategy which is based on a dynamic guard channel (GC) with multiple services, on the one hand, the switching calling priority is ensured, on the other hand, the resource allocation problem of different types of services is solved, so that the admission control which supports multiple services is realized.

Description

A kind of TD-LTE femtocell acceptance controlling method

Technical field

The invention belongs to mobile communication technology field, relate to timesharing Long Term Evolution TD-LTE(Time Division LongTerm Evolution) system and femtocell base station femtocell are a kind of TD-LTE femtocell acceptance controlling method.

Background technology

Femtocell base station femtocell, also referred to as Home eNodeB (HeNB, Home eNodeB), is the subminaturization mobile base station of complying with Mobile Communication Development and the release of broadband trend in recent years.It is a kind of low-power wireless access point, works in mandate frequency range, uses IP agreement, connects access by wideband circuits such as user existing ADSL, LAN, long-range by special gateway realization interconnecting from IP network to mobile core network.Its size is similar to ADSL Modem, has easy for installation, automatic configuration, the automatically feature such as network planning, plug and play.Concerning operator, femtocell can save operation maintenance cost, simultaneously under the prerequisite ensureing indoor quality of eating dishes without rice or wine, fast and effeciently improves in-door covering problem.Concerning user, employing femtocell means that the broadband data service that can obtain indoor high-quality voice service and higher rate is experienced, and meanwhile user can also enjoy cheaper rate.

Call access control is also referred to as access control or Call-Control1.For a known call connection request, according to the requirement of its service quality, and determine whether receive one newly to connect according to the whether satisfied quality having connected business of whole Internet resources.Along with the development of mobile communication technology, mobile subscriber's number increases severely, and business is tending towards variation gradually, just creates two competing performance requirements to system; Want the resource utilization of keeping system on the one hand, optimum service quality will be ensured as far as possible to the diversified business accepted on the other hand.Obviously, both must take into account, need to find a balance point by effective admission control algorithm, as far as possible many business demands are satisfied, make again resource utilization keep higher level simultaneously.

Mainly speech business is provided in the first generation and second generation mobile communication system, more be difficult to accept than call denial for user's dropped calls, so common way is treated with a certain discrimination by the initiation connection request that the connection request and this community that switch initiation are newly called out, priority treatment handover request.And LTE system is except supporting traditional speech business, also support multiple broadband data service; Particularly user uses the femtocell network based on LTE in indoor environment, by the enjoyment more experienced multimedia service and bring.Therefore admission control scheme can not, just concentrating in the compromise switching drop rate and call blocking rate, need to formulate rational strategy according to the characteristic of diversified business.

In LTE system, QoS requirement (the Qualityof Service that diversified business is corresponding is ensured by carrying this concept, QoS), wireless access control (Radio Admission Control, RAC) main task is permitted exactly or is refused the request of setting up, and the object of this request is exactly to set up new radio bearer.

Current femtocell is mainly deployed in that the private sites such as family, group, company use or be deployed in school as the dedicated resources of private user, market, large-scale sales field cover not enough effectively supplementing as macrocellular wireless communication system.Correspondingly, femtocell mainly contains three kinds of mode of operations: open mode, closed mode, mixed mode.Open mode allows all users to access.Closed mode only allows the user's access through authorizing, as the user such as kinsfolk or member of community.Mixed mode also allows all users to access, but the user belonging to closed user group (Closed Subscriber Group, CSG) enjoys preferential or preferential condition.Therefore the femtocell call access control under TD-LTE system needs to comprise two parts: the receiving authentication of (1) user: carry out authentication according to the current mode of operation of femtocell to user and determine the access thresholding of user; (2) wireless access control: consider system resource utilization present situation, the QoS of diversified business and the switching of diversified business and call congestion characteristic adjudicate whether this business of access.

Summary of the invention

The object of the present invention is to provide a kind of TD-LTE femtocell acceptance controlling method, ensure the priority of switch call on the one hand, solve the resource allocation problem between dissimilar business on the other hand, realize the call access control supporting diversified business.

Technical scheme of the present invention is: a kind of TD-LTE femtocell acceptance controlling method, after femtocell base station femtocell receives the carrying foundation request of user, first by the receiving authentication of user, according to femtocell current mode of operation authentication carried out to user and determine the access thresholding of user, determining the access priority of user; Then by based on business diversified dynamic protection channel wireless access strategy, realize the call access control supporting diversified business, carrying set up for the user meeting described access strategy, service is provided, the user not meeting policy mandates is excluded,

Described dynamic protection channel wireless access strategy is:

To session service configuration switch protecting channel; Switch protecting channel is not configured to stream class service and Best-Effort service; Described switch protecting channel is the channel resource in femtocell system resource corresponding to a proportion threshold value, when the ratio that the idling-resource of femtocell accounts for total resources is less than this proportion threshold value, refusal newly calls out access request, when whole resource is all occupied, refusal switch call access request, after described proportion threshold value initial setting, periodically dynamically update;

Except the switch protecting channel of session service, femtocell other division of resources intrasystem become two parts, a part is Best-Effort service private resource, another part is the preferential preempting resources of real time business, when distributing to the channel idle of real time business, Best-Effort service can use this part idle channel resources, then from Best-Effort service hand, seizes the former resource distributing to real time business when real time business needs, and ensures the service quality QoS of real time business;

In femtocell system during resource congestion, temporary transient stopping access service entering respective queue and queues up, different queue arranges different queuing thresholdings, if the service call time in queue exceedes the queuing time limit of this queue, from queue, just rejects business corresponding to this service call;

Real time business comprises session service and stream class service; the strategy of pre-determined threshold dynamic priority access is adopted to ensure the resource utilization of these two kinds of real time business; for the switch protecting channel of session service; intensified learning is adopted to determine the update strategy that switch protecting channel periodicity dynamically updates, with the switching drop rate of equalization session class business and call blocking rate.

According to femtocell current mode of operation authentication carried out to user and determine that the access thresholding of user is specially:

If under femtocell is operated in closed mode, then the user belonging to closed user group is only allowed to have access authority; If femtocell work in a hybrid mode, then the user belonging to non-closed user group also has the authority of access, but needs the access thresholding stricter than the user of closed user group, i.e. η _non-CSG≤ η _cSG, η _non-CSGrefer to the access thresholding of non-closed user group, η _cSGrefer to the access thresholding of closed user group;

If under femtocell is operated in open mode, then all users have access authority, and have identical access thresholding; L _required, L _freerepresent the Physical Resource Block number of current access request needs and the Physical Resource Block number of current system free time respectively, whether judgement allows the standard of access as follows:

η _uefor the corresponding access thresholding determined according to the access authority of user.

The strategy of pre-determined threshold dynamic priority access is adopted to ensure the resource utilization of real time business, if O _voice, O _streamrepresent the load of current sessions class business and stream class service respectively, L _voice, L _streamrepresent the pre-determined threshold of session service and stream class service respectively; Then session service and priority corresponding to stream class service are expressed as:

$\left\{\begin{array}{c}{P}_{\mathrm{voice}}=\frac{Q_{\mathrm{voice}}}{L_{\mathrm{voice}}}\\ P_{\mathrm{stream}}=\frac{O_{\mathrm{stream}}}{L_{\mathrm{stream}}}\end{array}\right.,$

The strategy of dynamic priority access is as follows:

To session service and the queue priority to stream class service in this femtocell community of ratio recanalization being accounted for total business by all kinds of business, the load namely by adjusting business adjusts the queue priority of business; In addition, in conjunction with the service distribution configuration L of this community _voiceand L _stream, ensure the blocking rate that real time business is overall, in real time business total blockage, when the obstruction from session service is greater than stream class service, increase L _voiceotherwise, increase L _stream.

Update cycle is set to switch protecting channel GC, periodically adjusts switch protecting channel GC size according to the switching drop rate of femtocell wireless communication system in the cycle and call blocking rate; Dynamically updating of switch protecting channel GC is a Sequence Decision model; within a switch protecting channel GC update cycle; femtocell wireless communication system is for current switching drop rate, call blocking rate; make a new switch protecting channel GC update action; thus make femtocell wireless communication system transfer to a new state; the corresponding wireless communication system state of the proportion threshold value that each switch protecting channel is corresponding; the change of state all can produce expense, and institute's generation expense is:

r=ω _ho×P _ho+ω _n×P _n

P _hoswitch drop rate, P _nnew call blocking rate, ω _ho, ω _ncorrespondence switches the weight gone offline with new call congestion, gives to switch the higher weighted value of drop rate and ω _ho> ω _n, embody femtocell wireless communication system and switching gone offline more responsive; R cost function embodies the compromise switched between drop rate and call blocking rate, and switch drop rate when switch protecting channel GC increases and reduce, and new call blocking rate increases, vice versa;

The guard channel finding generation expense minimum by intensified learning dynamically updates strategy:

Adopt infinite range discounted criterion:

Wherein for constant time discount factor, s _tfor the state that moment t proportion threshold value is corresponding, s ₀for proportion threshold value initial condition, if initial time state s ₀state value be s, π (s _t) represent the GC update action determined by the decision making algorithm of intensified learning according to the state of moment t, under the effect of proportion threshold value update strategy π, state s _ttake update action π (s _t) and the corresponding expense produced is r (s _t, π (s _t));

Optimum update strategy is:

In above formula, the update action that initial time is taked is assumed to be a, i.e. a ₀=a, causes the state s of subsequent time ₁change, suppose that its state value is s', i.e. s ₁=s'; expression state transfers to the probability of s' under the effect of update action a from s, S _sumrepresent the set of all possible state values;

By π (s _t) under every a pair state and update action to (s, a) is associated with a Q value function:

Expense expect R (s, when a) unknown, found the update strategy of optimum by Q value iteration:

Wherein α _t∈ [0,1) be the learning rate of intensified learning;

Selecting in the process of update action according to the update strategy in corresponding moment, with the update action that certain probability selection is concrete, described probability is:

$p\left(a\right|s)=1-\frac{e^{Q^{\mathrm{\π}}(s,a)}}{\underset{a\∈A}{\mathrm{\Σ}}{e}^{Q^{\mathrm{\π}}}(s,a)}$

P (a|s) represents the probability selecting action a when state value is s, and A is the set of all possible update action.

The present invention carries out authentication according to the current mode of operation of femtocell to user and determines the access thresholding of user; By based on diversified switching at runtime guard channel (the Guard Channel of business; GC) wireless access strategy; ensure the priority of switch call on the one hand, solve the resource allocation problem between dissimilar business on the other hand, realize the call access control supporting diversified business.

Accompanying drawing explanation

Fig. 1 is call access control overall flow figure of the present invention.

Fig. 2 is the business of the present invention is based on diversified priority query schematic diagram.

Fig. 3 is priority query of the present invention process chart.

Fig. 4 is that switch protecting dynamics of channels of the present invention upgrades schematic diagram.

Embodiment

Below in conjunction with accompanying drawing, most preferred embodiment is described in detail, but protection scope of the present invention is not limited to described embodiment.

Within a wireless communication network, the calling initiated to base station when new calling refers to that travelling carriage needs to converse, switch call is because the mobility of travelling carriage produces, and can switch when travelling carriage moves to another Serving cell from a Serving cell in communication process.In the present invention, user initiates business and comprises new calling and switch call, and travelling carriage is subscriber equipment, and a user may maintain multiple business having different QoS and require simultaneously.

Fig. 1 is overall flow figure of the present invention, mainly comprises the steps: the receiving authentication of (1) user: the mode of operation current according to femtocell carries out receiving authentication and the access thresholding determining user to user; (2) wireless access control: consider system resource utilization present situation, the QoS of diversified business and the switching of diversified business and call congestion characteristic adjudicate whether this business of access.

First service femtocell and Mobility Management Entity (Mobility Management Entity, MME) carry out signalling interactive process, to determine the authority of subscriber equipment (User Equipment, UE) and to determine the corresponding thresholding of UE according to UE authority: η _ue.If under femtocell is operated in closed mode, then the user belonging to closed user group CSG is only allowed to have access authority; If femtocell work in a hybrid mode, then the user belonging to non-closed user group Non-CSG also has the authority of access, but needs the access thresholding stricter than the user of CSG, i.e. η _non-CSG≤ η _cSG; If under femtocell is operated in open mode, then all users have access authority, and have identical access thresholding.

Whether comparison system surplus resources meets business demand, concrete analysis (1) according to the time slot proportion of TD-LTE, calculate each radio frames can Physical Resource Block (Physical Resource Block, PRB); (2) current according to user signal(l)ing condition, primarily of Modulation and Coding Scheme (Modulation and Coding Scheme, MCS) performance, calculates the transmission block size of each PRB; (3) corresponding according to business data rate, calculates the demand of current access request to resource.

Concrete scheme is as follows: in units of a radio frames, and can the idle PRB of average each radio frames of calculating current area meet the PRB required for the average each radio frames of user, namely meets following formula

$L_{\mathrm{free}}=L_{\mathrm{available}}-\underset{u}{\mathrm{\Σ}}\frac{R_u^k}{{\mathrm{TB}}_u^{\mathrm{mcs}}}$

$L_{\mathrm{required}}=\frac{R^k}{{\mathrm{TB}}^{\mathrm{mcs}}}$

L _availablerepresent each radio frames can Physical Resource Block number, L _freerepresent the Physical Resource Block number of current system free time, L _requiredrepresent the Physical Resource Block number of current access request needs.L _availabledepend on the time slot proportion of TD-LTE radio frames. for receiving the current resource taken of user, wherein for the data rate of the business k of the current activation of user u, the signal(l)ing condition of reflection active user is the size of transmission block corresponding to MCS.

Adjudicate the standard whether allowing user to access as follows:

By considering the feature of business, solve the resource allocation problem between dissimilar business.According to the different qualities of business, design based on diversified priority query as shown in Figure 2.Session service (Conversational ClassService) is high to the requirement of real-time, needs to ensure the blocking rate in handoff procedure, so need configuration switch protecting channel for session service.Stream class service (Streaming Class Service) does not have session service sensitivity to delay parameter; the support of major part subscriber equipment is queued up and itself has buffer memory; low to time delay sensitivity in handoff procedure, so do not need configuration switch protecting channel for video traffic.In addition, Best-Effort service (Best Effort Service) is more responsive to error rate, and lower to delay requirement, and therefore Best-Effort service does not need configuration switch protecting channel yet.

Except the guard channel of session service; other resources of system are divided into two parts; a part is Best-Effort service private resource; another part is the preferential preempting resources of real time business; when belonging to the channel idle of the preferential preempting resources of real time business, Best-Effort service can use this part resource, and resource utilization is increased greatly; when real time business needs, then from Best-Effort service hand, seize the QoS that the channel resource belonging to the preferential preempting resources of real time business ensures real time business.

Priority query's handling process as shown in Figure 3.During resource congestion, the business that temporarily cannot access enters respective queue and queues up.Different queue has different timeout threshold, if the calling in queue exceedes the time limit of queuing up just reject this calling from queue.

Because real time business comprises session service and stream class service, the strategy of pre-determined threshold dynamic priority access is adopted to ensure the resource utilization of these two kinds of real time business.O _voice, O _streamrepresent the load of current sessions class business and stream class service respectively.L _voice, L _streamrepresent the pre-determined threshold of session service and stream class service respectively.

Session service and priority corresponding to stream class service are expressed as $\left\{\begin{array}{c}{P}_{\mathrm{voice}}=\frac{Q_{\mathrm{voice}}}{L_{\mathrm{voice}}}\\ P_{\mathrm{stream}}=\frac{O_{\mathrm{stream}}}{L_{\mathrm{stream}}}\end{array}\right.,$ The strategy of dynamic priority access is as follows:

The proportion being accounted for total business by all kinds of business can adjust this community to session service and the queue priority to stream class service.Can also in conjunction with the service distribution configuration L of this community _voice, L _streamthese two parameters, ensure the blocking rate that real time business is overall.Such as: when real time business total blockage major part is from session service, should L be increased _voiceotherwise, increase L _stream.

For the switch protecting channel of session service, the cut-off preference strategy based on intensified learning is adopted to come switching drop rate and the call blocking rate of equalization session class business.The present invention regards switch protecting channel GC channel corresponding to a proportion threshold value as; it not reserved specific resource from total resources; but press the channel of the ratio setting of setting; this ratio is the ratio that switch protecting channel accounts for total resources; switch protecting channel when femtocell is initial as idling-resource; once this resource is released, just become a part for common signal channel.The ratio accounting for total resources when the idling-resource of femtocell is less than this proportion threshold value, and the request of the just new calling access of restriction, only has when whole resource is all occupied, the access request of just refusal switch call.

Switch protecting channel of the present invention neither be constant, but constantly change along with the state of femtocell wireless communication system.Switch protecting dynamics of channels upgrades as shown in Figure 4.The update cycle of setting switch protecting channel GC, periodically adjust GC according to the switching drop rate of system in this time period and call blocking rate.It is a Sequence Decision model that GC dynamically updates, wireless communication system is observed current state and is namely switched drop rate, call blocking rate, make a new GC update action, thus make femtocell wireless communication system transfer to a new state, and produce certain expense:

r=ω _ho×P _ho+ω _n×P _n

P _hoswitch drop rate, P _nnew call blocking rate, ω _ho, ω _ncorrespondence switches the weight gone offline with new call congestion.Give to switch the higher weighted value of drop rate and ω _ho> ω _n, embodiment system goes offline more responsive to switching.R cost function embodies the compromise switched between drop rate and call blocking rate, and switch drop rate when GC increases and reduce, and new call blocking rate increases, vice versa.

The present invention is arranged by switch protecting channel, and give switch call and compare the higher resource prioritization of new calling, this must affect new call Admission Performance, causes call blocking rate to raise.For this point, the present invention is by dynamically upgrading switch protecting channel based on the cut-off preference strategy of intensified learning, and balance switches drop rate and call blocking rate thus obtains better entire system performance.Illustrate below described based on intensified learning by preference strategy.

The corresponding wireless communication system state of the proportion threshold value that each switch protecting channel is corresponding; the change of state all can produce expense; the present invention dynamically updates strategy by the guard channel that intensified learning searching system expense is minimum; to ensure in the regular update of switch protecting channel, the expense that the update action adopted produces is minimum.The final result of decision process show that certain strategy makes the total cost of system under certain optiaml ciriterion minimum.Here optiaml ciriterion adopts infinite range discounted criterion:

Wherein for constant time discount factor (discount factor), embody the impact of the relatively current expense of future expenses.S _tfor the state that moment t proportion threshold value is corresponding, s ₀for proportion threshold value initial condition, if initial time state s ₀state value be s.π (s _t) represent the GC update action determined by the decision making algorithm of intensified learning according to the state of moment t.Under the effect of proportion threshold value update strategy π, state s _ttake update action π (s _t) and the corresponding expense produced is r (s _t, π (s _t)).

Optimum update strategy is:

In above formula, the update action that initial time is taked is assumed to be a, i.e. a ₀=a, causes the state s of subsequent time ₁change, suppose that its state value is s', i.e. s ₁=s'; expression state transfers to the probability of s' under the effect of update action a from s, S _sumrepresent the set of all possible state values.

By π (s _t) under every a pair state and update action to (s, a) is associated with a Q value function:

The task of intensified learning, be also simultaneously it advantage exactly can expense expect R (s, when a) unknown, found the strategy of optimum by simple Q value iteration:

Wherein α _t∈ [0,1) be the learning rate (learning factor) of intensified learning, which determining the new information obtained to what extent will replace old information.If α _tbe 0, then stopping learns, if α by system _tlevel off to 1, then will only consider up-to-date information.R (s _t, a _t) represent state s _ttake update action a _tand the corresponding expense produced.S _t+1the state in next moment after referring to t, a _t+1the update action in next moment after referring to t.

Selecting in the process of update action according to the update strategy in corresponding moment, take into account two kinds and explore new expense and utilize known expense two factors, here with certain probability selection update action, described probability is:

$p\left(a\right|s)=1-\frac{e^{Q^{\mathrm{\π}}(s,a)}}{\underset{a\∈A}{\mathrm{\Σ}}{e}^{Q^{\mathrm{\π}}}(s,a)}$

P (a|s) represents the probability selecting action a when state value is s, and A is the set of all possible update action.

The personage knowing this area will understand, although describe specific embodiment for the ease of explaining here, can make various change when not deviating from spirit and scope of the invention.Therefore, except as by the appended claims, can not be used for limiting the present invention.

Claims (4)

1. a TD-LTE femtocell acceptance controlling method, after it is characterized in that femtocell base station femtocell receives the carrying foundation request of user, first by the receiving authentication of user, according to femtocell current mode of operation authentication carried out to user and determine the access thresholding of user, determining the access priority of user; Then by based on business diversified dynamic protection channel wireless access strategy, realize the call access control supporting diversified business, carrying set up for the user meeting described access strategy, service is provided, the user not meeting policy mandates is excluded,

Described dynamic protection channel wireless access strategy is:

To session service configuration switch protecting channel; Switch protecting channel is not configured to stream class service and Best-Effort service; Described switch protecting channel is the channel resource in femtocell system resource corresponding to a proportion threshold value, when the ratio that the idling-resource of femtocell accounts for total resources is less than this proportion threshold value, refusal newly calls out access request, when whole resource is all occupied, refusal switch call access request, after described proportion threshold value initial setting, periodically dynamically update;

Except the switch protecting channel of session service, femtocell other division of resources intrasystem become two parts, a part is Best-Effort service private resource, another part is the preferential preempting resources of real time business, when distributing to the channel idle of real time business, Best-Effort service can use this part idle channel resources, then from Best-Effort service hand, seizes the former resource distributing to real time business when real time business needs, and ensures the service quality QoS of real time business;

In femtocell system during resource congestion, temporary transient stopping access service entering respective queue and queues up, different queue arranges different queuing thresholdings, if the service call time in queue exceedes the queuing time limit of this queue, from queue, just rejects business corresponding to this service call;

Real time business comprises session service and stream class service, the strategy of pre-determined threshold dynamic priority access is adopted to ensure the resource utilization of these two kinds of real time business, for the switch protecting channel of session service, intensified learning is adopted to determine the update strategy that switch protecting channel periodicity dynamically updates, with the switching drop rate of equalization session class business and call blocking rate;

Wherein, set to switch protecting channel GC the update cycle, periodically adjust switch protecting channel GC size according to the switching drop rate of femtocell wireless communication system in the cycle and call blocking rate; Dynamically updating of switch protecting channel GC is a Sequence Decision model; within a switch protecting channel GC update cycle; femtocell wireless communication system is for current switching drop rate, call blocking rate; make a new switch protecting channel GC update action; thus make femtocell wireless communication system transfer to a new state; the corresponding wireless communication system state of the proportion threshold value that each switch protecting channel is corresponding; the change of state all can produce expense, and institute's generation expense is:

r＝ω _ho×P _ho+ω _n×P _n

P _hoswitch drop rate, P _nnew call blocking rate, ω _ho, ω _ncorrespondence switches the weight gone offline with new call congestion, gives to switch the higher weighted value of drop rate and ω _ho> ω _n, embody femtocell wireless communication system and switching gone offline more responsive; R cost function embodies the compromise switched between drop rate and call blocking rate, and switch drop rate when switch protecting channel GC increases and reduce, and new call blocking rate increases, vice versa;

The guard channel finding generation expense minimum by intensified learning dynamically updates strategy:

Adopt infinite range discounted criterion:

Wherein for constant time discount factor, s _tfor the state that moment t proportion threshold value is corresponding, s ₀for proportion threshold value initial condition, if initial time state s ₀state value be s, π (s _t) represent the GC update action determined by the decision making algorithm of intensified learning according to the state of moment t, under the effect of proportion threshold value update strategy π, state s _ttake update action π (s _t) and the corresponding expense produced is r (s _t, π (s _t));

Optimum update strategy is:

In above formula, the update action that initial time is taked is assumed to be a, i.e. a ₀=a, causes the state s of subsequent time ₁change, suppose that its state value is s ', i.e. s ₁=s '; expression state transfers to the probability of s ' under the effect of update action a from s, S _sumrepresent the set of all possible state values;

By π (s _t) under every a pair state and update action to (s, a) is associated with a Q value function:

Expense expect R (s, when a) unknown, found the update strategy of optimum by Q value iteration:

Wherein α _t∈ [0,1) be the learning rate of intensified learning;

Selecting in the process of update action according to the update strategy in corresponding moment, with the update action that certain probability selection is concrete, described probability is:

$p\left(a\right|s)=1-\frac{e^{Q^{\mathrm{\π}}(s,a)}}{\underset{a\∈A}{\mathrm{\Σ}}{e}^{Q^{\mathrm{\π}}(s,a)}}$

P (a|s) represents the probability selecting action a when state value is s, and A is the set of all possible update action.

2. a kind of TD-LTE femtocell acceptance controlling method according to claim 1, is characterized in that carrying out authentication according to the current mode of operation of femtocell to user and determining that the access thresholding of user is specially:

If under femtocell is operated in closed mode, then the user belonging to closed user group is only allowed to have access authority; If femtocell work in a hybrid mode, then the user belonging to non-closed user group also has the authority of access, but needs the access thresholding stricter than the user of closed user group, i.e. η _non-CSG≤ η _cSG, η _non-CSGrefer to the access thresholding of non-closed user group, η _cSGrefer to the access thresholding of closed user group;

If under femtocell is operated in open mode, then all users have access authority, and have identical access thresholding; L _required, L _freerepresent the Physical Resource Block number of current access request needs and the Physical Resource Block number of current system free time respectively, whether judgement allows the standard of access as follows:

η _uefor the corresponding access thresholding determined according to the access authority of user.

3. a kind of TD-LTE femtocell acceptance controlling method according to claim 1 and 2, is characterized in that adopting the strategy of pre-determined threshold dynamic priority access to ensure the resource utilization of real time business, if O _voice, O _streamrepresent the load of current sessions class business and stream class service respectively, L _voice, L _streamrepresent the pre-determined threshold of session service and stream class service respectively; Then session service and priority corresponding to stream class service are expressed as:

$\left\{\begin{array}{c}{P}_{\mathrm{voice}}=\frac{O_{\mathrm{voice}}}{L_{\mathrm{voice}}}\\ P_{\mathrm{stream}}=\frac{O_{\mathrm{stream}}}{L_{\mathrm{stream}}}\end{array}\right.,$

The strategy of dynamic priority access is as follows:

4. a kind of TD-LTE femtocell acceptance controlling method according to claim 3, to session service and the queue priority to stream class service in this femtocell community of ratio recanalization that it is characterized in that accounting for total business by all kinds of business, the load namely by adjusting business adjusts the queue priority of business; In addition, in conjunction with the service distribution configuration L of this community _voiceand L _stream, ensure the blocking rate that real time business is overall, in real time business total blockage, when the obstruction from session service is greater than stream class service, increase L _voiceotherwise, increase L _stream.