CN103533577A - Judgment control method and system for vertical switching among heterogeneous wireless networks - Google Patents

Abstract

The invention provides a judgment control method and system for vertical switching among heterogeneous wireless networks. The method comprises the following steps that S1, when connection between a mobile user side and a current network does not meet the service requirement of the mobile user side, the mobile user side sends a switching request to base stations of all heterogeneous networks meeting the service requirement of the mobile user side in a scanning list; S2, all base stations receiving the switching request transmit the switching request to a vertical switching controller through respective wireless sensors; S3, the vertical switching controller calculates the blocking probability of each base station to be selected according to the history channel resource allocation and usage condition information of each base station to be selected which is stored in the corresponding wireless sensor, and switches and connects the mobile user side to the base station of which the blocking probability is minimum. According to the judgment control method and system for vertical switching among heterogeneous wireless networks provided by the invention, the channel resource usage condition information of each base station is taken as a judgment basis for vertical switching of the mobile user side by the vertical switch controller, so that a judgment result is more accurate.

Description

Vertical switch decision control method and system between a kind of heterogeneous wireless network

Technical field

The present invention relates to communication technical field, be specifically related to vertical switch decision control method and system between a kind of heterogeneous wireless network.

Background technology

The fast development of mobile communication and evolution, caused the sharply expansion of heterogeneous network quantity.In the future that can expect, our wireless network environment will be flooded with the heterogeneous network of a large amount of different systems, specification and standard.And due to competition and the complementary principle in market, these heterogeneous networks will progressively be determined the market place of oneself, and merge completely on the platform of next generation network.Therefore heterogeneous network converged is by a kind of trend that becomes 3G, 4G and further have to face in future network.In following wireless network environment, the seamless switching between heterogeneous network is absolutely necessary, and is also a difficult point in future network research.

In order to address this problem, the seamless mobility that people focus on sight under heterogeneous network environment supports research, and wherein most important research concentrates on seamless switching.In heterogeneous network, switch and be divided into level switching (HHO) and two kinds of vertical switchings (VHO).Than level, switch, vertically switch owing to occurring in the network of different structure, its switching mode and enforcement are more complicated, also more difficult.

In prior art, carry out vertical judgement of switching according to being all the acquisition of communicating by letter with mobile terminal device, according to the attribute of each network of acquisition for mobile terminal, adjudicate and how to switch, but the attribute information of each network that mobile device terminal is recognized is limited, can not understand the loading condition at ordinary times of each network.

Summary of the invention

The present invention is directed to above problem, the existing network architecture is improved, having proposed vertical switch decision control method between a kind of heterogeneous wireless network comprises: step S1, when mobile client shows the assessment of current interconnection network, when described mobile client does not meet the business need of described mobile client with being connected of current network, described mobile client sends handover request to the base station of all heterogeneous networks that meets the business need of described mobile client in scan list;

Step S2, all described base stations of the receiving described handover request all wireless senser by are separately sent to vertical switch controller by described handover request;

Step S3, described wireless senser Real-time Collection is also stored the channel resource allocation service condition information of base station described in each, the blocking probability that described vertical switch controller sends each base station to be selected of handover request historical channel resource allocation service condition information according to described mobile client is calculated base station to be selected described in each, switches described mobile client the base station that is connected to blocking probability minimum.

In the first preferred embodiment provided by the invention: mobile client described in described step S1 is mobile phone terminal or other mobile terminals that have wireless access function, and described mobile terminal has accessed a certain network under heterogeneous network environment, comprising: LTE network, 3G network or WIFI network;

The base station that described mobile client sends handover request comprises LTE base station, 3G network base station and wifi focus.

In the second preferred embodiment provided by the invention: in described step S2, the business need that described mobile client judges whether to meet described mobile client to all-network in current interconnection network and scan list is to judge according to the RSS value of described network, when if the RSS value of network is less than the threshold value of setting, judge that described network can not meet the business need of described mobile client.

In the 3rd preferred embodiment provided by the invention: the method that vertical switch controller described in described step S3 calculates the blocking probability of base station to be selected described in each according to the historical channel resource allocation service condition information of base station to be selected described in each comprises:

Step S301, wireless senser collection and store base station each timing node T={t described in each described in each ₁, t ₂t _zthe quantity X of described mobile client of interior access base station i _i={ x ⁱ ₁, x ⁱ ₂x ⁱ _z-1and pick out the quantity Y of the described mobile client of base station i _i={ y ⁱ ₁, y ⁱ ₂y ⁱ _z-1;

Z represents timing node number;

Step S302, obtains t _zthe mean value of the quantity of the access of base station to be selected and the described mobile client that picks out described in each in time period: ${\mathrm{\λ}}_i\left(t_{z-1}\right)=(1/t_{z-1})\underset{k=1}{\overset{z-1}{\mathrm{\Σ}}}{x}_k$ With ${\mathrm{\μ}}_i\left(t_{z-1}\right)=(1/t_{z-1})\underset{k=1}{\overset{z-1}{\mathrm{\Σ}}}{y}_k;$

Described t _ztime period is artificially set according to demand, described wireless senser according to the time period of described setting at a fixed time node carry out periodic Data Update, asking for the data that described mean value adopts is the latest data after recent renewal;

Step S303, distributes to vertical switching and BTS channel resource that to carry out abstract be the queuing model of a M/M/n/n, and according to queuing theory, the blocking probability that calculates any one base station i is: $P_i={({\mathrm{\λ}}_i\left(t_{z-1}\right)/{\mathrm{\μ}}_i\left(t_{z-1}\right))}^n{(n!\underset{j=0}{\overset{n}{\mathrm{\Σ}}}{(({\mathrm{\λ}}_i\left(t_{z-1}\right)/{\mathrm{\μ}}_i\left(t_{z-1}\right))}^j/j!))}^{-1};$

N represents that base station maximum holds the number of channel;

The queuing model of M/M/n/n is loss queuing model processed, represent that described mobile client access procedure is Poisson process, the time interval that arrives system is independent, and obeys the negative exponent distribution that parameter is λ, whole when occupied when n channel of base station, described mobile client is left away automatically.

In the 4th preferred embodiment provided by the invention: described vertical switch controller calculates after the blocking probability of all described base stations to be selected, if the handover blocking probability of former network is minimum, keep and being connected of described former network; If there is the network of other blocking probability minimum, described vertical switch controller sends the signaling that disconnects and be connected with the network of described blocking probability minimum with described former network to described mobile client.

The 5th preferred embodiment provided by the invention provides between a kind of heterogeneous wireless network vertical switch decision control system, comprising: the wireless senser (4) that base station, connection corresponding to base station described in each are communicated by letter and with the vertical switch controller of wireless senser described in each (4) and described base station communication;

Described base station comprises LTE base station (2) and wifi focus (3); When mobile client does not meet the business need of described mobile client with being connected of current network, the base station of all heterogeneous networks that meets the business need of described mobile client receives the handover request that described mobile client sends, and described base station sends to described vertical switch controller by described handover request by described wireless senser (4) separately;

The channel resource allocation service condition information that connects described wireless senser (4) Real-time Collection of communication and store each described in base station corresponding to base station described in each;

Described vertical switch controller (5) receives described base station to be passed through after the described handover request of described wireless senser (4) transmission separately, according to described mobile client (1), send the blocking probability that the historical channel resource allocation service condition information of base station to be selected described in each of handover request is calculated base station to be selected described in each, described mobile client (1) is switched to the base station that is connected to blocking probability minimum.

In the 6th preferred embodiment provided by the invention: described mobile client (1) judges that whether network meets business need is to judge according to the RSS value of described network, when if the RSS value of described network is less than the threshold value of setting, judge that described network can not meet the business need of described mobile client.

In the 7th preferred embodiment provided by the invention: the method that described vertical switch controller (5) calculates the blocking probability of base station to be selected described in each according to the historical channel resource allocation service condition information of base station to be selected described in each comprises:

Described vertical switch controller (5) is according to each base station each timing node T={t of wireless senser described in each (4) storage ₁, t ₂t _zthe quantity X of described mobile client of interior access base station i _i={ x ⁱ ₁, x ⁱ ₂x ⁱ _z-1and pick out the quantity Y of the described mobile client of base station i _i={ y ⁱ ₁, y ⁱ ₂y ⁱ _z-1, obtain t _zthe mean value of the quantity of the access of base station to be selected and the described mobile client that picks out described in each in time period: ${\mathrm{\λ}}_i\left(t_{z-1}\right)=(1/t_{z-1})\underset{k=1}{\overset{z-1}{\mathrm{\Σ}}}{x}_k$ With ${\mathrm{\μ}}_i\left(t_{z-1}\right)=(1/t_{z-1})\underset{k=1}{\overset{z-1}{\mathrm{\Σ}}}{y}_k;$

Wherein, z represents timing node number, described t _ztime period is artificially set according to demand, described wireless senser (4) according to the time period of described setting at a fixed time node carry out periodic Data Update, the data that described vertical switch controller (5) averaged adopts are the latest data after recent renewal;

Described vertical switch controller (5) distributes to vertical switching and BTS channel resource that to carry out abstract be the queuing model of a M/M/n/n, and according to queuing theory, the blocking probability that calculates any one base station i is: $P_i={({\mathrm{\λ}}_i\left(t_{z-1}\right)/{\mathrm{\μ}}_i\left(t_{z-1}\right))}^n{(n!\underset{j=0}{\overset{n}{\mathrm{\Σ}}}{(({\mathrm{\λ}}_i\left(t_{z-1}\right)/{\mathrm{\μ}}_i\left(t_{z-1}\right))}^j/j!))}^{-1};$

Wherein, n represents that base station maximum holds the number of channel;

The queuing model of M/M/n/n is loss queuing model processed, represent that described mobile client access procedure is Poisson process, the time interval that arrives system is independent, and obeys the negative exponent distribution that parameter is λ, whole when occupied when n channel of described base station, described mobile client is left away automatically.

In the 8th preferred embodiment provided by the invention: described vertical switch controller (5) calculates after the blocking probability of all described base stations to be selected, if the handover blocking probability of former network is minimum, keep and being connected of former network; If there is the network of other blocking probability minimum, described vertical switch controller (5) sends the signaling that disconnects and be connected with the network of described blocking probability minimum with described former network to described mobile client (1).

Between a kind of heterogeneous wireless network provided by the invention, the beneficial effect of vertical switch decision control method and system comprises:

1, vertical switch decision control method and system between a kind of heterogeneous wireless network provided by the invention, the existing network architecture is improved, the vertical switch controller that setting is all communicated by letter with mobile client with base station, each base station is sent to vertical switch controller by wireless senser by the channel resource service condition information of base station, as the vertical judgement foundation of switching of mobile client, make court verdict more accurate.Simultaneously, because being unifies judgement by vertical switch controller, by able to programmeization of vertical switch controller decision algorithm transformed, make network can require to change according to keeper's difference the foundation of vertical switch decision, increased the control of network integrated environment and operability, better distributing radio resource, improves the load balancing of network.

The time period of the historical channel resource allocation service condition information of the wireless senser storage that 2, vertical switch controller adopts can artificially be set according to demand, if need to gather mass data, get mean values comparatively accurately, can set long time period, for example one month, if consider the particularity of period, the historical data that needs a nearer time range, can set a shorter time period, for example one hour, the time period of historical data be arranged so that flexibly structure is more accurate according to demand.

Accompanying drawing explanation

Be illustrated in figure 1 the flow chart of vertical switch decision control method between a kind of heterogeneous wireless network provided by the invention;

Be illustrated in figure 2 the structure chart of vertical switch decision control system between a kind of heterogeneous wireless network provided by the invention.

Embodiment

With reference to the accompanying drawings the specific embodiment of the present invention is described in further detail below.

The invention provides vertical switch decision control method between a kind of heterogeneous wireless network, as shown in Figure 1, as shown in Figure 1, the method comprises its flow chart:

Step S1, when mobile client shows the assessment of current interconnection network, when this mobile client does not meet the business need of mobile client with being connected of current network, mobile client sends handover request to the base station of all heterogeneous networks that meets the business need of mobile client in scan list.

Step S2, all base stations of the receiving handover request all wireless senser by are separately sent to vertical switch controller by this handover request.

Step S3, wireless senser Real-time Collection is also stored the channel resource allocation service condition information of each base station, vertical switch controller sends each base station to be selected of handover request historical channel resource allocation service condition information according to mobile client is calculated the blocking probability of each base station to be selected, mobile client is switched to the base station that is connected to blocking probability minimum.

Further, in step S1, mobile client is mobile phone terminal or other mobile terminals that have wireless access function, and this mobile terminal has accessed a certain network under heterogeneous network environment, as LTE network, 3G network or WIFI network etc., the base station that mobile client sends handover request comprises LTE base station, 3G network base station and wifi focus etc.

In step S2, the business need that mobile client judges whether to meet mobile client to all-network in current interconnection network and scan list is the RSS(received signal strength according to network, acknowledge(ment) signal intensity) value judges, when if the RSS value of network is less than the threshold value of setting, judge that this network can not meet the business need of mobile client.

Vertical switch controller decision algorithm can according to keeper's difference require to change vertical switch decision according to carrying out able to programmeization transformation, increased the control of network integrated environment and operability, the embodiment of method that in step S3, vertical switch controller calculates the blocking probability of each base station to be selected according to the historical channel resource allocation service condition information of each base station to be selected comprises:

Step S301, each wireless senser collection and store each base station each timing node T={t ₁, t ₂t _zthe quantity X of mobile client of interior access base station i _i={ x ⁱ ₁, x ⁱ ₂x ⁱ _z-1and pick out the quantity Y of the mobile client of base station i _i={ y ⁱ ₁, y ⁱ ₂y ⁱ _z-1, z represents timing node number.

Step S302, obtains t _zthe mean value of the quantity of the access of interior each base station to be selected of time period and the mobile client picking out: ${\mathrm{\λ}}_i\left(t_{z-1}\right)=(1/t_{z-1})\underset{k=1}{\overset{z-1}{\mathrm{\Σ}}}{x}_k$ With ${\mathrm{\μ}}_i\left(t_{z-1}\right)=(1/t_{z-1})\underset{k=1}{\overset{z-1}{\mathrm{\Σ}}}{y}_k.$

Wherein, this t _ztime period can artificially be set according to demand, if need to gather mass data, get mean values comparatively accurately, can set long time period, for example one month, if consider the particularity of period, need the historical data of a nearer time range, can set a shorter time period, for example one hour.Wireless senser according to the time period of this setting at a fixed time node carry out periodic Data Update, the data that in step S302, averaged adopts are the latest data after recent renewal.

Step S303, plans the behavior of each base station by queueing theory, vertical switching and BTS channel resource are distributed to carry out abstract be the queuing model of a M/M/n/n, and according to queuing theory, the blocking probability that calculates any one base station i is: $P_i={({\mathrm{\λ}}_i\left(t_{z-1}\right)/{\mathrm{\μ}}_i\left(t_{z-1}\right))}^n{(n!\underset{j=0}{\overset{n}{\mathrm{\Σ}}}{(({\mathrm{\λ}}_i\left(t_{z-1}\right)/{\mathrm{\μ}}_i\left(t_{z-1}\right))}^j/j!))}^{-1}.$

Wherein n represents that base station maximum holds the number of channel.The queuing model of M/M/n/n is loss queuing model processed, represent that mobile client access procedure is Poisson process, the time interval that arrives system is independent, and obeys the negative exponent distribution that parameter is λ, whole when occupied when n channel of base station, mobile client is left away automatically.

Vertical switch controller calculates after the blocking probability of all base stations to be selected, if the handover blocking probability of former network is minimum, maintenance and former network is connected; If there is the network of other blocking probability minimum, this vertical switch controller sends the signaling that disconnects with former network and be connected with the network of blocking probability minimum to this mobile client.

The present invention also provides vertical switch decision control system between a kind of heterogeneous wireless network, its structure chart as shown in Figure 2, as shown in Figure 2, this system comprises: base station, the wireless senser (4) that connect communication corresponding to each base station and with the vertical switch controller of each wireless senser (4) and base station communication.

Base station comprises LTE base station (2) and wifi focus (3) etc., as mobile client (UE, while User Equipment) not meeting the business need of mobile client with being connected of current network, the base station of all heterogeneous networks that meets the business need of this mobile client receives the handover request that this mobile client sends, and by this request, the wireless senser (4) by separately sends to vertical switch controller in base station.

The channel resource allocation service condition information that connects wireless senser (4) Real-time Collection of communication and store each base station corresponding to each base station.

Vertical switch controller (5) receives base station to be passed through after the handover request of wireless senser (4) transmission separately, according to this mobile client (1), send the historical channel resource allocation service condition information of each base station to be selected of handover request and calculate the blocking probability of each base station to be selected, this mobile client (1) is switched to the base station that is connected to blocking probability minimum.

The existing network architecture is improved, the vertical switch controller that setting is all communicated by letter with mobile client with base station, each base station is sent to vertical switch controller by wireless senser by the channel resource service condition information of base station, as the vertical judgement foundation of switching of mobile client, make court verdict more accurate.Simultaneously, because being unifies judgement by vertical switch controller, by able to programmeization of vertical switch controller decision algorithm transformed, make network can require to change according to keeper's difference the foundation of vertical switch decision, increased the control of network integrated environment and operability, better distributing radio resource, improves the load balancing of network.

Further, mobile client (1) judges that whether network meets business need is to judge according to the RSS value of network, if when the RSS value of network is less than the threshold value of setting, judges that this network can not meet the business need of mobile client.

The method that vertical switch controller (5) calculates the blocking probability of each base station to be selected according to the historical channel resource allocation service condition information of each base station to be selected comprises:

Vertical switch controller (5) is according to each base station each timing node T={t of each wireless senser (4) storage ₁, t ₂t _zthe quantity X of mobile client of interior access base station i _i={ x ⁱ ₁, x ⁱ ₂x ⁱ _z-1and pick out the quantity Y of the mobile client of base station i _i={ y ⁱ ₁, y ⁱ ₂y ⁱ _z-1, z represents timing node number, obtains t _zthe mean value of the quantity of the access of interior each base station to be selected of time period and the mobile client picking out: ${\mathrm{\λ}}_i\left(t_{z-1}\right)=(1/t_{z-1})\underset{k=1}{\overset{z-1}{\mathrm{\Σ}}}{x}_k$ With ${\mathrm{\μ}}_i\left(t_{z-1}\right)=(1/t_{z-1})\underset{k=1}{\overset{z-1}{\mathrm{\Σ}}}{y}_k.$

Wherein, this t _ztime period can artificially be set according to demand, if need to gather mass data, get mean values comparatively accurately, can set long time period, for example one month, if consider the particularity of period, need the historical data of a nearer time range, can set a shorter time period, for example one hour.Wireless senser (4) according to the time period of this setting at a fixed time node carry out periodic Data Update, the data that vertical switch controller (5) averaged adopts are the latest data after recent renewal.

Vertical switch controller (5) distributes to vertical switching and BTS channel resource that to carry out abstract be the queuing model of a M/M/n/n, and according to queuing theory, the blocking probability that calculates any one base station i is: $P_i={({\mathrm{\λ}}_i\left(t_{z-1}\right)/{\mathrm{\μ}}_i\left(t_{z-1}\right))}^n{(n!\underset{j=0}{\overset{n}{\mathrm{\Σ}}}{(({\mathrm{\λ}}_i\left(t_{z-1}\right)/{\mathrm{\μ}}_i\left(t_{z-1}\right))}^j/j!))}^{-1}.$

Wherein n represents that base station maximum holds the number of channel.The queuing model of M/M/n/n is loss queuing model processed, represent that mobile client access procedure is Poisson process, the time interval that arrives system is independent, and obeys the negative exponent distribution that parameter is λ, whole when occupied when n channel of base station, mobile client is left away automatically.

Vertical switch controller (5) calculates after the blocking probability of all base stations to be selected, if the handover blocking probability of former network is minimum, maintenance and former network is connected; If there is the network of other blocking probability minimum, this vertical switch controller (5) sends the signaling that disconnects with former network and be connected with the network of blocking probability minimum to this mobile client (1).

Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.

Claims (9)

1. a vertical switch decision control method between heterogeneous wireless network, is characterized in that, described method comprises:

Step S1, when mobile client shows the assessment of current interconnection network, when described mobile client does not meet the business need of described mobile client with being connected of current network, described mobile client sends handover request to the base station of all heterogeneous networks that meets the business need of described mobile client in scan list;

Step S2, all described base stations of the receiving described handover request all wireless senser by are separately sent to vertical switch controller by described handover request;

Step S3, described wireless senser Real-time Collection is also stored the channel resource allocation service condition information of base station described in each, the blocking probability that described vertical switch controller sends each base station to be selected of handover request historical channel resource allocation service condition information according to described mobile client is calculated base station to be selected described in each, switches described mobile client the base station that is connected to blocking probability minimum.

2. the method for claim 1, it is characterized in that, mobile client described in described step S1 is mobile phone terminal or other mobile terminals that have wireless access function, and described mobile terminal has accessed a certain network under heterogeneous network environment, comprising: LTE network, 3G network or WIFI network;

The base station that described mobile client sends handover request comprises LTE base station, 3G network base station and wifi focus.

3. the method for claim 1, it is characterized in that, in described step S2, the business need that described mobile client judges whether to meet described mobile client to all-network in current interconnection network and scan list is to judge according to the RSS value of described network, when if the RSS value of network is less than the threshold value of setting, judge that described network can not meet the business need of described mobile client.

4. the method for claim 1, is characterized in that, the method that vertical switch controller described in described step S3 calculates the blocking probability of base station to be selected described in each according to the historical channel resource allocation service condition information of base station to be selected described in each comprises:

Step S301, wireless senser collection and store base station each timing node T={t described in each described in each ₁, t ₂t _zthe quantity X of described mobile client of interior access base station i _i={ x ⁱ ₁, x ⁱ ₂x ⁱ _z-1and pick out the quantity Y of the described mobile client of base station i _i={ y ⁱ ₁, y ⁱ ₂y ⁱ _z-1;

Z represents timing node number;

Step S302, obtains t _zthe mean value of the quantity of the access of base station to be selected and the described mobile client that picks out described in each in time period: ${\mathrm{\λ}}_i\left(t_{z-1}\right)=(1/t_{z-1})\underset{k=1}{\overset{z-1}{\mathrm{\Σ}}}{x}_k$ With ${\mathrm{\μ}}_i\left(t_{z-1}\right)=(1/t_{z-1})\underset{k=1}{\overset{z-1}{\mathrm{\Σ}}}{y}_k;$

Described t _ztime period is artificially set according to demand, described wireless senser according to the time period of described setting at a fixed time node carry out periodic Data Update, asking for the data that described mean value adopts is the latest data after recent renewal;

Step S303, distributes to vertical switching and BTS channel resource that to carry out abstract be the queuing model of a M/M/n/n, and according to queuing theory, the blocking probability that calculates any one base station i is: $P_i={({\mathrm{\λ}}_i\left(t_{z-1}\right)/{\mathrm{\μ}}_i\left(t_{z-1}\right))}^n{(n!\underset{j=0}{\overset{n}{\mathrm{\Σ}}}{(({\mathrm{\λ}}_i\left(t_{z-1}\right)/{\mathrm{\μ}}_i\left(t_{z-1}\right))}^j/j!))}^{-1};$

N represents that base station maximum holds the number of channel;

The queuing model of M/M/n/n is loss queuing model processed, represent that described mobile client access procedure is Poisson process, the time interval that arrives system is independent, and obeys the negative exponent distribution that parameter is λ, whole when occupied when n channel of base station, described mobile client is left away automatically.

5. the method for claim 1, is characterized in that, described vertical switch controller calculates after the blocking probability of all described base stations to be selected, if the handover blocking probability of former network is minimum, keeps and being connected of described former network; If there is the network of other blocking probability minimum, described vertical switch controller sends the signaling that disconnects and be connected with the network of described blocking probability minimum with described former network to described mobile client.

6. between a heterogeneous wireless network, switched system is controlled in vertical judgement, it is characterized in that, described system comprises: base station, the wireless senser (4) that connect communication corresponding to base station described in each and with the vertical switch controller of wireless senser described in each (4) and described base station communication;

Described base station comprises LTE base station (2) and wifi focus (3); When mobile client does not meet the business need of described mobile client with being connected of current network, the base station of all heterogeneous networks that meets the business need of described mobile client receives the handover request that described mobile client sends, and described base station sends to described vertical switch controller by described handover request by described wireless senser (4) separately;

The channel resource allocation service condition information that connects described wireless senser (4) Real-time Collection of communication and store each described in base station corresponding to base station described in each;

Described vertical switch controller (5) receives described base station to be passed through after the described handover request of described wireless senser (4) transmission separately, according to described mobile client (1), send the blocking probability that the historical channel resource allocation service condition information of base station to be selected described in each of handover request is calculated base station to be selected described in each, described mobile client (1) is switched to the base station that is connected to blocking probability minimum.

7. system as claimed in claim 6, it is characterized in that, described mobile client (1) judges that whether network meets business need is to judge according to the RSS value of described network, when if the RSS value of described network is less than the threshold value of setting, judge that described network can not meet the business need of described mobile client.

8. system as claimed in claim 6, is characterized in that, the method that described vertical switch controller (5) calculates the blocking probability of base station to be selected described in each according to the historical channel resource allocation service condition information of base station to be selected described in each comprises:

Described vertical switch controller (5) is according to each base station each timing node T={t of wireless senser described in each (4) storage ₁, t ₂t _zthe quantity X of described mobile client of interior access base station i _i={ x ⁱ ₁, x ⁱ ₂x ⁱ _z-1and pick out the quantity Y of the described mobile client of base station i _i={ y ⁱ ₁, y ⁱ ₂y ⁱ _z-1, obtain t _zthe mean value of the quantity of the access of base station to be selected and the described mobile client that picks out described in each in time period: ${\mathrm{\λ}}_i\left(t_{z-1}\right)=(1/t_{z-1})\underset{k=1}{\overset{z-1}{\mathrm{\Σ}}}{x}_k$ With ${\mathrm{\μ}}_i\left(t_{z-1}\right)=(1/t_{z-1})\underset{k=1}{\overset{z-1}{\mathrm{\Σ}}}{y}_k;$

Wherein, z represents timing node number, described t _ztime period is artificially set according to demand, described wireless senser (4) according to the time period of described setting at a fixed time node carry out periodic Data Update, the data that described vertical switch controller (5) averaged adopts are the latest data after recent renewal;

Described vertical switch controller (5) distributes to vertical switching and BTS channel resource that to carry out abstract be the queuing model of a M/M/n/n, and according to queuing theory, the blocking probability that calculates any one base station i is: $P_i={({\mathrm{\λ}}_i\left(t_{z-1}\right)/{\mathrm{\μ}}_i\left(t_{z-1}\right))}^n{(n!\underset{j=0}{\overset{n}{\mathrm{\Σ}}}{(({\mathrm{\λ}}_i\left(t_{z-1}\right)/{\mathrm{\μ}}_i\left(t_{z-1}\right))}^j/j!))}^{-1};$

Wherein, n represents that base station maximum holds the number of channel;

The queuing model of M/M/n/n is loss queuing model processed, represent that described mobile client access procedure is Poisson process, the time interval that arrives system is independent, and obeys the negative exponent distribution that parameter is λ, whole when occupied when n channel of described base station, described mobile client is left away automatically.

9. system as claimed in claim 6, is characterized in that, described vertical switch controller (5) calculates after the blocking probability of all described base stations to be selected, if the handover blocking probability of former network is minimum, keeps and being connected of former network; If there is the network of other blocking probability minimum, described vertical switch controller (5) sends the signaling that disconnects and be connected with the network of described blocking probability minimum with described former network to described mobile client (1).

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