CN101072436A - Two-hop cellular relay network switching method for base station integrated control - Google Patents

Abstract

The method includes steps: (1) constructing cost function corresponding to following different application scenes including measured results of synthesis mobile station, switching types, mobility of mobile station, and one or more types of current service; (2) based on the constructed cost function to calculate minimal cost function (MCF) values of users' links to be selected, and calculate cost function of current user's link; (3) when MCF value of a user's link to be selected is smaller than cost function of current user's link, then, the method requests the mobile station to switch to target access station corresponding to the user's link with lowest MCF.

Description

The changing method that is used for the central controlled two-hop cellular junction network in base station

Technical field

The present invention relates to a kind of changing method that is applicable to the central controlled two-hop cellular junction network in base station.

Background technology

Along with the continuous development of broadband wireless communication technique, following cordless communication network constantly increases the demand of high-speed data service, also the enhancing of performances such as throughput of system and coverage is had higher requirement simultaneously.This not only needs to adopt advanced transmission technology, also needs new network architecture support.In traditional cellular network, introduce relaying technique, not only can promote the user's data transmission rate, can also enlarge the coverage of radio communication and then reach the characteristic of consistent message transmission rate (uniform data rate), thereby remedy the deficiency of existing system, reducing network investment and operation cost, is the following cordless communication network framework of a kind of very attractive and competitiveness therefore.

In cell mobile communication systems, the mobility of terminal and the time variation of radio propagation channel can influence the transmission quality of the current link of user in real time, for guaranteeing that the user remains normal communication, system need immediately adjust and sets up new communication link according to the variation of network state, and realizes taking over seamlessly between new old link.Switching is as an important mobile management function, also is a key feature of mobile communication system simultaneously, and its flow process provides and triggering and decision-making mechanism will directly influence the performance of whole system.

The application of relaying technique has brought new challenge also for the handover mechanism and the decision-making technique of cellular network, and original handover mechanism can't adapt to new system requirements.

At first, in the legacy cellular mobile communications network, switch and only between source base station, purpose base station and three kinds of network elements of terminal, carry out.Introducing along with relaying technique, in network except original base station, terminal, also increased this new network element of relay station, and the path of transmission has also increased the repeated link between base station and the relay station thereupon, and the user link between relay station and the user, as seen because the increase of changeable target and network topology complicated, the switching of honeycomb junction network will be complicated more than conventional cellular network.

Secondly, different with existing cellular network, owing to introduced relay station, will there be polytype switching in the user link in the honeycomb junction network.Except the switching between the base station, the user also may be switched between the base station of neighbor cell and relay station, relay station and relay station.And switch and not only can occur in the cell boarder place, also may occur in inside, sub-district, promptly the user in same sub-district the base station and relay station, relay station and relay station between switch.

No matter be which class is switched, all need when the change communication link, still can converse normally, but also will accomplish fast, effectively so just to help reducing whole system and disturb, reduce call drop, improve power system capacity.

Obviously, handover mechanism and decision-making technique between traditional different districts base station have not been suitable for the honeycomb junction network, so should rethink at the switching problem of introducing under the relaying technique situation at the characteristics of honeycomb junction network.

Therefore, a kind of new changing method is provided, can be according to current network state information and the characteristics of switching at the honeycomb junction network simultaneously, optimize handover trigger and decision-making technique, as far as possible rationally, effectively utilize limited system resource, improve transmission rate, communication quality and network capacity, become a right basic problem of two-hop cellular relay system demand side.

Summary of the invention

Demand and problems of the prior art at the two-hop cellular relay system, the present invention proposes the switch triggering method and the handover decisions method of the central controlled two-hop cellular relay system of a kind of BS of being applicable to, when considering to switch the front and back transmission quality, the new feature of comparing with conventional cellular network at aspects such as network topologies according to the two-hop cellular network that is had, the time-delay and the signaling consumption thereof that switch have been taken into account, handoff request rate and handover failure rate have been reduced, improve resource utilization, guaranteed the telecommunication service quality of user under mobile environment.And by compromise consideration to algorithm complex and performance gain, when improving performance of handoffs, reduce extra network signal load as far as possible, get increasing substantially of systematic function in return with few feedback information, performance cost has stronger practicality than high.

According to the present invention, a kind of switch triggering method that is used for the central controlled two-hop cellular junction network in base station is provided, comprise step:

(1) at different concrete application scenarioss, one or more in the mobility of comprehensive moving station measuring result, switching type, handoff failure information, mobile radio station and the present type of service make up corresponding cost function;

(2), and calculate the cost function value of active user's link according to the minimum cost functional value of each alternative user link of cost function calculation of described structure;

(3) at the minimum cost functional value of described alternative user link during less than the cost function value of described active user's link, request switches to mobile radio station and the corresponding target access station of the user link of cost function value minimum.

Wherein in step (2),, obtain the minimum cost functional value of each alternative user link by calculating the cost function value of the user link between mobile radio station and the access station, and

By calculating the cost function value of the user link between mobile radio station and the alternative access station, obtain the cost function value of active user's link.

Wherein said access station is base station or relay station, and described alternative access station and described target access station are base station and the relay stations in this sub-district, or the base station of neighbor cell and relay station.

Wherein in step (1),, obtain described moving station measuring result by measuring link-quality between each access station in mobile radio station and the alternative access station.

Wherein said switching type comprises:

Switching, switching from relay station to base station and the switching from relay station to relay station of mobile radio station from the base station to the relay station in the sub-district, switching, switching from this cell base station to neighbor cell relay station, switching from this sub-district relay station to neighbor cell base station, the switching from this sub-district relay station to neighbor cell relay station of mobile radio station between neighbor cell from this cell base station to neighbor cell base station.

Wherein in step (1),, obtain the mobility of described mobile radio station by measuring the translational speed of mobile radio station.

Wherein said type of service is the type of service of stipulating in concrete network.

Described switch triggering method also comprises step:

When described target access station does not allow described mobile radio station to insert, send the handoff failure notice to described handover trigger module, and described handover trigger module is upgraded and the corresponding handoff failure information of described switching;

Based on the handoff failure information after the described renewal, execution in step (2), (3), and when described target access station allowed described mobile radio station to insert, the notice upper layer entity was carried out corresponding the processing.

Described handover trigger module is positioned at mobile radio station side or network side.

Calculate the cost function of each alternative user link according to following formula:

Wherein, S _lFor setting up from described mobile radio station to alternative access station r _kThe hand off signaling expense that the switching type of alternative user link l correspondence is required, P _lBe the received power that from the measurement result of each alternative user link, obtains,

μ, λ and ω are weight factor, and μ, and ω all can be according to the type of service adaptive configuration of current to be switched mobile radio station,

V _MSBe the speed modifying factor, the numerical value of described velocity factor is by concrete equipment and network based v _MSSet,

T _l ^FailureFor attempting switching to the frequency of failure of the pairing target access station of alternative user link l.

Wherein calculate the cost function of active user's link according to following formula:

f _local＝-P ₀- _VMS

Wherein P0 is the received power of mobile radio station on active user's link.

Wherein according to the user link of following formula calculation cost functional value minimum:

$l_{\min }=\underset{l}{\arg \min }\left\{f_l\right\}$

Described switch triggering method also comprises step:

When described target access station does not allow described mobile radio station to insert, send the handoff failure notice to described handover trigger module, and described handover trigger module is upgraded the described corresponding handoff failure number of times T that switches _l ^Failure

If

Less than the higher limit of the handoff failure number of times of concrete network regulation, then execution in step (2), (3), and when described target access station allowed described mobile radio station to insert, the notice upper layer entity was carried out corresponding the access and is handled;

If

More than or equal to the higher limit of the handoff failure number of times of concrete network regulation, then described finishing switching.

According to another aspect of the present invention, provide a kind of handover decisions method that is used for the central controlled two-hop cellular junction network in base station, comprised step:

(1) at different concrete application scenarioss, one or more in the mobility of comprehensive moving station measuring result, switching type, handoff failure information, mobile radio station and the present type of service make up corresponding cost function;

(2), and calculate the cost function value of active user's link according to the minimum cost functional value of each alternative user link of cost function calculation of described structure;

(3) at the minimum cost functional value of described alternative user link during less than the cost function value of described active user's link, request switches to mobile radio station and the corresponding target access station of the user link of cost function value minimum;

(4) at different concrete application scenarioss, one or more in active user's link-quality, switching type, current business state and the type of service and the user type of comprehensive to be switched mobile radio station make up the corresponding priority level function;

(5), calculate the priority of each to be switched mobile radio station according to the pri function of described structure;

(6) according to priority order from high to low, switch decision module is treated handover of mobile stations and is carried out handover operation one by one.

Wherein in step (4), whether there is the business datum of transmitting to determine the current business state of described mobile radio station by detecting mobile radio station.

Wherein in step (4), Virtual network operator is determined described user type by the different stage of definition different user.

Wherein make up pri function according to following formula:

$p_{{\mathrm{MS}}_n}={\mathrm{\ρSIR}}_{{\mathrm{MS}}_n}-{\mathrm{\ηG}}_{{\mathrm{MS}}_n}-{\mathrm{\ϵW}}_{{\mathrm{MS}}_n}+{\mathrm{\σU}}_{{\mathrm{MS}}_n},$

SINR wherein _MSnBe the Signal to Interference plus Noise Ratio of to be switched mobile radio station active user link, G _MSnBy the obtainable resource of corresponding switching type discharges gain,

Wherein, ρ, η and σ are weight factors,

W _MSnServe as reasons concrete network and equipment the decision the business-level parameter,

U _MSnServe as reasons concrete network and equipment the decision the user gradation parameter.

In the present invention, described two-hop cellular relay system is made of a plurality of cellular cells, comprises a base station BS in each sub-district, one or more relay station RS and one or more mobile subscriber terminal MS.MS both can directly pass through the BS access network, also can set up and being connected with access network of BS by RS.

The central controlled two-hop cellular network of wherein said BS is meant that processing and the decision-making to handoff request must be carried out in this network in BS.

Wherein said target access station is the access station of being selected from alternative access station by switch triggering method in handoff procedure as switching target.Here, direct-connected equipment when access station is meant the MS access network, access station can be BS or RS; Alternative access station is meant the access station that MS may switch to, and alternative access station can be the BS or the RS of this sub-district BS or RS or neighbor cell.

The present invention is directed to the characteristics of two-hop cellular junction network, a kind of switch triggering method that adapts with it and handover decisions method have been proposed, the time-delay and the signaling consumption thereof that switch have not only been reduced, handoff request rate and handover failure rate have been reduced, guaranteed the telecommunication service quality of user under mobile environment, also made finite wireless resources obtain effective utilization.Simultaneously get increasing substantially of systematic function in return with few feedback information, performance cost has stronger practicality than high.

Description of drawings

Further describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments.Wherein

Fig. 1 shows and realizes changing method flow chart of the present invention, comprises switch triggering method flow chart and handover decisions method flow diagram;

Fig. 2 shows seven kinds of switching type schematic diagrames that the present invention relates to;

The two-dimentional signaling consumption matrix S that Fig. 3 shows among the present invention to be provided;

The two-dimentional resource release matrix G that Fig. 4 shows among the present invention to be provided;

Fig. 5 to Figure 11 shows the signaling process of seven kinds of switching type correspondences switching for initiating by the BS centralized control and by BS of verifying that performance of the present invention provides;

Figure 12 and Figure 13 are the signaling consumption matrix S that calculates to the switching flow shown in Figure 11 at Fig. 5 ' and resource release matrix G '.

When Figure 14 showed number of users and gradually changes, the performance change curve of waiting for time delay was on average switched in system.

When Figure 15 shows number of users and gradually changes, the performance change curve of system signaling Capacity Ratio.

Embodiment

Below in conjunction with Fig. 1 to Fig. 4 changing method of the present invention is described.

At first, all should safeguard the alternative access station set of this MS at the BS of MS and its affiliated subdistrict

, alternative access station

, k=1,2 ..., K, K are the alternative access station number of this MS.This access station can be the BS or the RS of this sub-district BS or RS or neighbor cell.

Secondly, this changing method comprises switch triggering method module and handover decisions method module, and wherein the former both can be positioned at the MS side and also can be positioned at network side, by heterogeneous networks and equipment decision.The latter is positioned at network side.

Once more, should use for the handover trigger module according to signaling consumption matrix S of hand off signaling expense configuration of current network, also will discharge gain matrix G simultaneously and use for switch decision module according to resource of two-hop cellular relay network topology configuration at the BS end.Here, the type number that defines this sub-district BS, this sub-district RS, neighbor cell BS, neighbor cell RS is respectively 0,1,2,3.The element S of signaling consumption matrix S then _Ij(i=0,1; J=0,1,2,3; I, j ≠ 0) and resource discharge the element g of gain matrix G _Ij(i=0,1,2,3; J=0,1; I, j ≠ 0) represent from type number to be signaling consumption and the resource release gain of access station when type number is the access station switching of j of i respectively.The calculating of signaling consumption is by the decision of concrete network and equipment, and need make normalized when configuration hand off signaling expense matrix, that is: Resource discharges gain table and is shown in the MS switching back release system performance gain that Radio Resource brought, and it specifically quantizes account form by real network and equipment decision

At last, MS can measure the quality of alternative user link, obtains the parameters such as received power on the alternative user link of each bar.The time interval of measuring is determined by concrete network.

After the each measurement of MS end is finished, give the handover trigger module that is positioned at MS side or network side with measurement report, this module will be carried out following steps:

The first step, handover trigger module obtain type number and the type number of current access station and the measurement result of relative users link thereof of alternative access station.At first according to current access station type number i and target access station type number j, from two-dimentional signaling consumption matrix, find foundation from this MS to r _kThe required hand off signaling expense S of switching type of alternative user link l correspondence _l=S _IjThen, from the measurement result of each alternative user link, obtain its received power P _lPresent speed v with to be switched MS _MSHere, make up a cost function according to above parameter and by the weight factor that type of service determines:

Wherein, μ, λ and ω are weight factor, and μ, and ω all can be according to the type of service adaptive configuration of current to be switched MS, with the different requirements of reflection different service types to handover delay.

V _MSBe the speed modifying factor, the numerical value of this factor is by concrete equipment and network based v _MSSet.T _l ^FailureFor attempting switching to the frequency of failure of the pairing target access station of alternative user link l.

In second step, (1) formula of using is calculated the cost function of each alternative user link, calculates the cost function of active user's link with formula (2):

f _local＝-P ₀-V _MS (2)

In the 3rd step, from the cost function value fl of second all alternative user link of calculating of step, select minimum value and pairing link thereof, promptly

$l_{\min }=\underset{l}{\arg \min }\left\{f_l\right\}---\left(3\right)$

If $f_{l_{\min }}+\mathrm{lag}\_\mathrm{th}<f_{\mathrm{local}}$ , then the handover trigger module will notify its upper layer entity to initiate handoff request, require to switch to link l _MinPairing target access station, and report that this MS is at link l _MinOn the SINR value.Otherwise, keep original subscriber's link.Wherein, hysteresis threshold

w _IntraAnd w _InterCan dispose voluntarily according to real network.

In the 4th step,, then upgrade the corresponding handoff failure number of times T of this switching if the handover trigger module is received the handoff failure notice _l ^FailureIf

Higher limit less than the handoff failure number of times of concrete network regulation then forwarded for second step to.If

More than or equal to the higher limit of the handoff failure number of times of concrete network regulation, finishing switching this time then, handover trigger module notice upper layer entity is handled accordingly.

When handoff request arrives switch decision module, carry out following steps:

The first step, at first, switch decision module is obtained the SINR value SINR of to be switched MS active user link from handoff request _MSn(dB), service condition and type of service and user type, wherein MS _nBe certain to be switched MS.Then, according to MS _nCurrent access station type number i and target access station type number j find the obtainable resource of corresponding switching type institute and discharge gain from two-dimentional resource release gain matrix $g_{{\mathrm{MS}}_n}=g_{\mathrm{ij}}$ , make up a pri function according to above parameter and by the weight factor that type of service determines:

$p_{{\mathrm{MS}}_n}={\mathrm{\&rho;SIR}}_{{\mathrm{MS}}_n}-{\mathrm{\&eta;G}}_{{\mathrm{MS}}_n}-{\mathrm{\&epsiv;W}}_{{\mathrm{MS}}_n}+{\mathrm{\&sigma;U}}_{{\mathrm{MS}}_n}---\left(5\right)$

Wherein, ρ, η and σ are weight factors. W _MSnBe the business-level parameter, it embodies the requirement of corresponding business to real-time, and this parameter value is by concrete network and equipment decision, and its value is more little, and expression is corresponding professional high more to the real-time requirement.U _MSnBe the user gradation parameter, it embodies the grade of respective user, and this parameter value is by concrete network and equipment decision, and its value is more little, and the grade of expression respective user is high more, should preferentially guarantee its service quality more.

In second step, (5) formula of using is calculated the pri function value of each to be switched MS.

In the 3rd step, the pri function value that second step was calculated sorts P _MSnBe worth more for a short time, then priority is high more, according to priority order from high to low to be switched MS is carried out handover operation one by one then.

Verify the superiority of changing method of the present invention below according to a concrete switching embodiment.

Fig. 5 to Figure 11 shows the signaling process of seven kinds of switching type correspondences switching for initiating by the BS centralized control and by BS of verifying that performance of the present invention provides.Wherein signaling and message are described as follows:

MS_MSR-REP is the signaling that comprises the MS measurement report.When BSHO-REQ was BS according to switch triggering method decision is initiated to switch, notice MS or notice MS and the current RS that inserts thereof carried out the signaling of hand-off process.HO_INFO-IND is for when the switching target access station is RS, and the BS of this RS affiliated subdistrict notifies the corresponding preparation that this RS inserts to be switched MS and the signaling of processing.HO_INFO-ACK is that RS completes successfully after the corresponding preparation and processing that inserts to be switched MS the signaling of replying its affiliated BS.HOinformation request and HO information response.

For when the target access station is positioned at neighbor cell, handoff request and the response message between this sub-district BS and neighbor cell BS, transmitted, they will transmit by the interface between the defined BS of concrete network.

According to the embodiment of Fig. 5 to the signaling process of seven kinds of switching type correspondences shown in Figure 11, and suppose to be signaling consumption unit with signaling bar number in the present embodiment, signaling consumption matrix S in the time of can obtaining adopting current embodiment with reference to the general signaling consumption computational methods described in the present invention ', as shown in figure 12.In addition, discharge gain with the difference of switching the employed chain travel permit of back access network number as resource before supposing in the present embodiment to switch, can calculate the resource release matrix G ' when adopting current embodiment, as shown in figure 13 with MS.

Figure 12 and signaling consumption matrix S shown in Figure 13 ' and the condition of resource release matrix G under, emulation obtain the average handover delay of system and signaling capacity than (SCR) as Figure 14 and shown in Figure 15, we do not consider the influence of user velocity, service condition and type of service and user type in the emulation here.

Figure 14 show Figure 12 and Figure 13 show respectively the signaling consumption matrix S ' and resource release matrix G ' condition under, and the descending maximum transmission power of BS is 1w, when the descending maximum transmission power of RS is 0.2w, according to switch triggering method of the present invention and handover decisions method, with system load, be number of users when gradually changing, the performance change curve of waiting for time delay is on average switched in system.

Figure 15 show Figure 12 and Figure 13 show respectively the signaling consumption matrix S ' and resource release matrix G ' condition under, and the descending maximum transmission power of BS is 1w, when the descending maximum transmission power of RS is 0.2w, according to switch triggering method of the present invention and handover decisions method, with system load, be number of users when gradually changing, the performance change curve of system signaling Capacity Ratio.

Figure 14 has shown the performance curve of the average handover delay of system along with system load.Here average handover delay is defined as all users of system from initiating for the first time handoff request constantly until its handover success delay statistics mean value constantly.By Tu Kede, the strategy of consideration handover delay is better than not considering the strategy of handover delay, be that ω=1 an o'clock handover delay is less than ω=0 o'clock, because, for a MS, when switching target is RS, if RS does not have available resources, this MS will select other switching targets BS or RS, reduce average handover delay, also play the effect of load balance simultaneously.When considering signaling consumption simultaneously, MS tends to switch on the BS, can arrange resource owing to BS can arrange resource greater than RS, thereby has reduced to switch unaccepted chance, finally reduces handover delay.

For the performance of algorithm among overall merit the present invention, the definition signaling capacity is signaling consumption and channel capacity ratio than (SCR), promptly

$\mathrm{SCR}=\frac{\mathrm{Singaling}\_\mathrm{Cost}}{\mathrm{Capacity}}---\left(6\right)$

SCR is more little, shows that this method can exchange bigger power system capacity by less signaling consumption for, and then systematic function is good more.As can be seen from Figure 15, the system SCR that considers the signaling consumption strategy is not than considering the little of signaling consumption strategy, and promptly μ=1 an o'clock SCR is better than μ=0 o'clock.

It is to be noted, though emulation is at the specific hand off signaling flow process of a cover, but because algorithm, cost function and pri function that the inventive method adopts itself have certain generality, therefore, when in the network that is applied to adopt different hand off signaling flow processs, the inventive method still can embody superiority.

Comprehensive legend as seen, changing method of the present invention has not only reduced the time-delay and the signaling consumption thereof that switch, reduced handoff request rate and handover failure rate, guaranteed the telecommunication service quality of user under mobile environment, also made finite wireless resources obtain effective utilization.Simultaneously get increasing substantially of systematic function in return with few feedback information, performance cost has stronger practicality than high.

Although the present invention has been described with reference to preferred embodiment and verified superiority of the present invention, those skilled in the art can make various modifications and replacement to the present invention by reference specification embodiment and accompanying drawing, and can not deviate from the spirit and scope of the present invention.Therefore these modifications and replacement all should fall within protection scope of the present invention.

Claims (29)

1, a kind of switch triggering method that is used for the central controlled two-hop cellular junction network in base station comprises step:

(1) at different concrete application scenarioss, one or more in the mobility of comprehensive moving station measuring result, switching type, handoff failure information, mobile radio station and the present type of service make up corresponding cost function;

(2), and calculate the cost function value of active user's link according to the minimum cost functional value of each alternative user link of cost function calculation of described structure;

(3) at the minimum cost functional value of described alternative user link during less than the cost function value of described active user's link, request switches to mobile radio station and the corresponding target access station of the user link of cost function value minimum.

2, switch triggering method according to claim 1 wherein in step (2), by calculating the cost function value of the user link between mobile radio station and the access station, obtains the minimum cost functional value of each alternative user link, and

By calculating the cost function value of the user link between mobile radio station and the alternative access station, obtain the cost function value of active user's link.

3, switch triggering method according to claim 2, wherein said access station are base station or relay station, and described alternative access station and described target access station are base station and the relay stations in this sub-district, or the base station of neighbor cell and relay station.

4, switch triggering method according to claim 1 wherein in step (1), by measuring link-quality between each access station in mobile radio station and the alternative access station, obtains described moving station measuring result.

5, switch triggering method according to claim 1, wherein said switching type comprises:

Switching, switching from relay station to base station and the switching from relay station to relay station of mobile radio station from the base station to the relay station in the sub-district, switching, switching from this cell base station to neighbor cell relay station, switching from this sub-district relay station to neighbor cell base station, the switching from this sub-district relay station to neighbor cell relay station of mobile radio station between neighbor cell from this cell base station to neighbor cell base station.

6, switch triggering method according to claim 1 wherein in step (1), by measuring the translational speed of mobile radio station, obtains the mobility of described mobile radio station.

7, switch triggering method according to claim 1, wherein said type of service are the types of service of stipulating in concrete network.

8, switch triggering method according to claim 1 also comprises step:

When described target access station does not allow described mobile radio station to insert, send the handoff failure notice to described handover trigger module, and described handover trigger module is upgraded and the corresponding handoff failure information of described switching;

Based on the handoff failure information after the described renewal, execution in step (2), (3), and when described target access station allowed described mobile radio station to insert, the notice upper layer entity was carried out corresponding the processing.

9, switch triggering method according to claim 1, wherein said handover trigger module is positioned at mobile radio station side or network side.

10, switch triggering method according to claim 1, wherein calculate the cost function of each alternative user link according to following formula:

Wherein, S _lFor setting up from described mobile radio station to alternative access station r _kThe required hand off signaling expense of switching type of alternative user link l correspondence, P _lBe the received power that from the measurement result of each alternative user link, obtains,

μ, λ and ω are weight factor, and μ, and ω all can be according to the type of service adaptive configuration of current to be switched mobile radio station,

V _MSBe the speed modifying factor, the numerical value of described velocity factor is by concrete equipment and network based v _MSSet,

T _l ^FailureFor attempting switching to the frequency of failure of the pairing target access station of alternative user link l.

11, switch triggering method according to claim 10, wherein calculate the cost function of active user's link according to following formula:

f _local＝-P ₀-V _MS

Wherein P0 is the received power of mobile radio station on active user's link.

12, switch triggering method according to claim 11, wherein according to the user link of following formula calculation cost functional value minimum:

$l_{\min }=\underset{l}{\arg \min }\left\{f_l\right\}.$

13, switch triggering method according to claim 1 also comprises step:

When described target access station does not allow described mobile radio station to insert, send the handoff failure notice to described handover trigger module, and described handover trigger module is upgraded the described corresponding handoff failure number of times T that switches _l ^Failure

If

Less than the higher limit of the handoff failure number of times of concrete network regulation, then execution in step (2), (3), and when described target access station allowed described mobile radio station to insert, the notice upper layer entity was carried out corresponding the access and is handled;

If

More than or equal to the higher limit of the handoff failure number of times of concrete network regulation, then described finishing switching.

14, a kind of handover decisions method that is used for the central controlled two-hop cellular junction network in base station comprises step:

(1) at different concrete application scenarioss, one or more in the mobility of comprehensive moving station measuring result, switching type, handoff failure information, mobile radio station and the present type of service make up corresponding cost function;

(2), and calculate the cost function value of active user's link according to the minimum cost functional value of each alternative user link of cost function calculation of described structure;

(3) at the minimum cost functional value of described alternative user link during less than the cost function value of described active user's link, request switches to mobile radio station and the corresponding target access station of the user link of cost function value minimum;

(4) at different concrete application scenarioss, one or more in active user's link-quality, switching type, current business state and the type of service and the user type of comprehensive to be switched mobile radio station make up the corresponding priority level function;

(5), calculate the priority of each to be switched mobile radio station according to the pri function of described structure;

(6) according to priority order from high to low, switch decision module is treated handover of mobile stations and is carried out handover operation one by one.

Whether 15, handover decisions method according to claim 14 wherein in step (4), has the business datum of transmitting to determine the current business state of described mobile radio station by detecting mobile radio station.

16, handover decisions method according to claim 14, wherein in step (4), Virtual network operator is determined described user type by the different stage of definition different user.

17, switch triggering method according to claim 14 wherein in step (2), by calculating the cost function value of the user link between mobile radio station and the access station, obtains the minimum cost functional value of each alternative user link, and

By calculating the cost function value of the user link between mobile radio station and the alternative access station, obtain the cost function value of active user's link.

18, switch triggering method according to claim 17, wherein said access station are base station or relay station, and described alternative access station and described target access station are base station and the relay stations in this sub-district, or the base station of neighbor cell and relay station.

19, switch triggering method according to claim 14 wherein in step (1), by measuring link-quality between each access station in mobile radio station and the alternative access station, obtains described moving station measuring result.

20, switch triggering method according to claim 14, wherein said switching type comprises:

Switching, switching from relay station to base station and the switching from relay station to relay station of mobile radio station from the base station to the relay station in the sub-district, switching, switching from this cell base station to neighbor cell relay station, switching from this sub-district relay station to neighbor cell base station, the switching from this sub-district relay station to neighbor cell relay station of mobile radio station between neighbor cell from this cell base station to neighbor cell base station.

21, switch triggering method according to claim 14 wherein in step (1), by measuring the translational speed of mobile radio station, obtains the mobility of described mobile radio station.

22, switch triggering method according to claim 14, wherein said type of service are the types of service of stipulating in concrete network.

23, switch triggering method according to claim 14 also comprises step:

When described target access station does not allow described mobile radio station to insert, send the handoff failure notice to described handover trigger module, and described handover trigger module is upgraded and the corresponding handoff failure information of described switching;

Based on the handoff failure information after the described renewal, execution in step (2), (3), when described target access station allowed described mobile radio station to insert, the notice upper layer entity was carried out corresponding the processing.

24, switch triggering method according to claim 14, wherein said handover trigger module is positioned at mobile radio station side or network side.

25, switch triggering method according to claim 14, wherein calculate the cost function of each alternative user link according to following formula:

Wherein, S _lFor setting up from described mobile radio station to alternative access station r _kThe required hand off signaling expense of switching type of alternative user link l correspondence, P _lBe the received power that from the measurement result of each alternative user link, obtains,

μ, λ and ω are weight factor, and μ, and ω all can be according to the type of service adaptive configuration of current to be switched mobile radio station,

V _MSBe the speed modifying factor, the numerical value of described velocity factor is by concrete equipment and network based v _MSSet,

T _l ^FailureFor attempting switching to the frequency of failure of the pairing target access station of alternative user link l.

26, switch triggering method according to claim 25, wherein calculate the cost function of active user's link according to following formula:

f _local＝-P ₀-VMS

Wherein P0 is the received power on the mobile radio station active user link.

27, switch triggering method according to claim 26, wherein according to the user link of following formula calculation cost functional value minimum:

$l_{\min }=\underset{l}{\arg \min }\left\{f_l\right\}.$

28, switch triggering method according to claim 14 also comprises step:

When described target access station does not allow described mobile radio station to insert, send the handoff failure notice to described handover trigger module, and described handover trigger module is upgraded the described corresponding handoff failure number of times T that switches _l ^Failure

If Less than the higher limit of the handoff failure number of times of concrete network regulation, then execution in step (2), (3), and when described target access station allowed described mobile radio station to insert, the notice upper layer entity was carried out corresponding the access and is handled;

If More than or equal to the higher limit of the handoff failure number of times of concrete network regulation, then described finishing switching.

29, handover decisions method according to claim 14 wherein makes up pri function according to following formula:

$p_{{\mathrm{MS}}_n}=\mathrm{\&rho;}{\mathrm{SIR}}_{M{S}_n}-\mathrm{\&eta;}{G}_{M{S}_n}-\mathrm{\&epsiv;}{W}_{{\mathrm{MS}}_n}+\mathrm{\&sigma;}{U}_{{\mathrm{MS}}_n},$

SINR wherein _MSnBe the Signal to Interference plus Noise Ratio of to be switched mobile radio station active user link, G _MSnBy the obtainable resource of corresponding switching type discharges gain,

Wherein, ρ, η and σ are weight factors,

W _NSnServe as reasons concrete network and equipment the decision the business-level parameter,

U _MSnServe as reasons concrete network and equipment the decision the user gradation parameter.

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