CN1753560A - Method of controlling mobile equipment selection cell in radio communication - Google Patents

Abstract

This invention relates to a method for controlling mobile devices to select local areas in the radio communication system including: a, in the accumulated information for service frequency layers sent by a network device, there are identifications showing that if said service can be provided in the non-optimized frequency layers, b, the user device re-selects the local areas based on the identifications, c, receiving services in the selected area.

Description

Controlling mobile equipment is selected the method for sub-district in a kind of radio communication

Technical field

The present invention relates to the communications field, relate in particular to the method for controlling mobile equipment selection sub-district in a kind of radio communication.

Technical background

Multicast service comprises business such as multicast and broadcasting, is the technology that transmits data from a data source to a plurality of targets.In traditional mobile network, CBS (Cell Broadcast Service cell broadcaste service) allows low bit rate data to share broadcast channel to all users' transmissions by the sub-district, belongs to information series business.

Now, people no longer are satisfied with phone and messaging service to the demand of mobile communication, fast development along with the Internet, a large amount of multimedia services emerge, the some of them applied business requires a plurality of users can receive identical data simultaneously, as video request program, television broadcasting, video conference, online education, interactive game etc.These mobile multi-media services are compared with general data, have characteristics such as data volume is big, longer duration, delay sensitive.Present IP multicasting technology only is applicable to wired IP network, is not suitable for the mobile network, because the mobile network has particular network structure, functional entity and wave point, these are all different with wired IP network.

In order to effectively utilize mobile network resource, the WCDMA/GSM global standardsization organize 3GPP to propose MBMS (Multimedia Broadcast/Multicast Service multimedia broadcast/multicast service), in the mobile network, provide a data source to send the point-to-multipoint service of data to a plurality of users, the realization Internet resources are shared, improve utilization rate of network resource, the interface resource of especially eating dishes without rice or wine.The MBMS of 3GPP definition can not only realize the classes of messages multicast and the broadcasting of plain text low rate, and can also realize the multicast and the broadcasting of high-speed multimedia business, and this has complied with the trend of following mobile data development undoubtedly.

The architecture of MBMS as shown in Figure 1, in order to support the MBMS business, increased the mobile network functional entity newly---BM-SC (broadcast multicast service center), it is content provider's a inlet, be used for authorizing and initiating the MBMS bearer service, and plan transmits the MBMS content to schedule at mobile network.

In addition, UE (subscriber equipment), UTRAN (land radio access web), GERAN (GSM EDGE Radio Access Network), SGSN (Serving GPRS Support Node), GGSN functional entitys such as (Gateway GPRS Support Nodes) strengthen, and have increased the relevant function of MBMS.

MBMS comprises multicast pattern and broadcast mode.Multicast pattern needs user's corresponding multicast group of contracting, and carries out activation of service, and produces corresponding charge information.Because it is different that multicast and broadcast mode exist, cause also difference of its operation flow on business demand.

The MBMS business has two kinds of pattern: PTM (Point toMultipoint point is to multiple spot) pattern and PTP (Point to Point point-to-point) pattern when transmitting between UTRAN and UE.The PTM pattern sends identical data by the MTCH logic channel, and all add multicast service or can receive the interested UE of broadcasting service; Ptp mode sends data by the DTCH logic channel, has only a corresponding UE to receive.

As shown in Figures 2 and 3, be MBMS multicast pattern operation flow and broadcast mode operation flow schematic diagram.Can see, in MBMS multicast service flow process, the user add and session to begin two steps be separate, that is to say a user may be before session begins also may the session after session begins carry out in multicast service of adding.

In present system, connect according to RRC Connected (Radio Resource control connection) and whether to set up, UE is divided into two kinds of Idle (free time) pattern and RRC Connected patterns.Do not have to set up the UE that RRC is connected with UTRAN equipment and be in the Idle pattern, the sign that the UE under this pattern can only be by NAS (Non-Access Stratum) layer (for example: IMSI (international mobile subscriber identity)) distinguish; Set up the UE that RRC is connected with UTRAN equipment and be in RRC Connected pattern, the UE under this pattern has distributed RNTI (Radio Network Temporary Identifier), as the sign of this UE on Common transport channel.

UE for the RRC pattern, the type of level that connects according to RRC and the UE transmission channel that can use is divided into different conditions with UE again: CELL PCH, CELL FACH, the UE of CELL DCH state can distinguish on the level of sub-district, and the UE of URA PCH state can distinguish on the URA level.The UE of CELL DCH state has been assigned with special-purpose physical channel, can use dedicated transmission channel and shared channel, and their combination.The UE of CELL FACH state is at a descending continuous public transmission channel of monitoring (FACH), the common signal channel (RACH) that uplink assignment is default wanted.The UE of CELL PCH and URA PCH state adopts the mode of DRX (discontinuous reception) by relevant PCH channel of PICH channel monitoring, under this two states without any up activity.

In cellular communications networks, the mobile meeting of terminal equipment causes requirement to change Network Access Point to keep the contact of terminal and network, just wants terminal to change the sub-district of being stationed.In the WCDMA/GSM system,, finish the change of sub-district by sub-district gravity treatment and handover operation according to the difference of UE state.

Prior art adopts the portable terminal of the machine-processed cause network layer control receiving multicast business of FLC (Frequency Layer Convergence frequency layer convergence information) to select the sub-district.FLC is meant that the preferential gravity treatment of UTRAN request UE will send the process of the frequency layer of MBMS business to plan.

The RRM of RNC (radio network controller) is the professional PL (preferredlayer optimized frequency layer) of determining of each MBMS, and the PL of same business can get different values in the different piece of service area.On a PL, all MBMS business have identical MBMS offset (deviant).Session Start (session) message that receives the Iu interface from RNC begins to receiving in Session Stop (conversation end) end of message during this period of time, and UTRAN may go up indication FLC information at MBMS MCCH (putting the multiple spot control channel).The FLC information of a MBMS business comprises:

This MBMS service identification;

Optimized frequency layer information;

The MBMS deviant.

The UE that receives this MBMS business measures the quality of Serving cell and adjacent sub-district, utilizes the MBMS deviant to assess the quality of each sub-district, selects top-quality sub-district.

The user adds under the situation of a plurality of multicast services, can receive the FLC information of a plurality of business, if these business are in different frequency layer, have different deviants, present scheme can't be handled, and can only report the user, make a choice by the user, receive the business on one of them frequency layer.This has influenced the reception of user to the business that added, has wasted terminal capability.

Summary of the invention

Purpose of the present invention just provides a kind of method, addresses the above problem, and makes terminal can handle the situation that the multicast service that is added is positioned at different frequency layer automatically, thereby provides more business for the user in terminal wireless access capability scope as far as possible.

For this reason, the present invention adopts following technical scheme:

Controlling mobile equipment is selected the method for sub-district in a kind of radio communication, it is characterized in that may further comprise the steps:

A, in the traffic frequencies layer accumulated information that the network equipment sends, carry the sign that can this business be provided in not preferred frequency layer;

Can b, subscriber equipment carry out the sub-district gravity treatment in the sign that not preferred frequency layer is provided according to this business;

C, professional in the sub-district reception of choosing.

Among the described step a, described frequency layer convergence information also comprises multicast service preferred layer frequency information and deviant;

Among the described step b, subscriber equipment carries out the sub-district gravity treatment according to multicast service preferred layer frequency information and deviant simultaneously.

Described step b further one of comprises the following steps:

If b11 first multicast service has identical preferred layer with second multicast service, carry out the sub-district gravity treatment according to preferred layer information and deviant;

If b12 first multicast service has different preferred layers with second multicast service, and can professional first multicast service and second multicast service of showing in the sign that not preferred frequency layer is provided all can not be provided at not preferred layer, then between first multicast service and second multicast service, make a choice, carry out the sub-district gravity treatment according to choose professional optimized frequency layer information and deviant by the user; Otherwise, carry out the sub-district gravity treatment according to the optimized frequency layer information and the deviant of a plurality of business.

Described step b, the mass value of following formula calculation services sub-district and adjacent sub-district is adopted in the sub-district gravity treatment:

Serving cell: $R_s=Q_{\mathrm{meas},s}+{\mathrm{Qhyst}}_s+\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{F}_i*{\mathrm{Qflcoffset}}_i$

Adjacent sub-district: $R_n=Q_{\mathrm{meas},n}-{\mathrm{Qoffset}}_{s,n}+\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{F}_i*{\mathrm{Qflcoffset}}_i-{\mathrm{TO}}_n*(1-L_n)$

Wherein:

Q _{Means, s}: the received signal quality value of Serving cell;

Q _{Means, n}: the received signal quality value of adjacent sub-district;

Qhyst _s: the hysteresis of Serving cell;

Qoffset _{S, n}: the deviant of adjacent sub-district and Serving cell;

Qflcoffset _i: the deviant of i optimized frequency layer;

F _i: whether the deviant of i optimized frequency layer effectively identifies in this sub-district;

TO _n: be used for representing interim deviant;

L _n: whether the priority of Serving cell and adjacent sub-district equates in the sign layered cell structure;

Wherein, the sub-district of R value belongs to frequency layer i and frequency layer i is at least one professional optimized frequency layer in the subscriber equipment institute receiving multicast traffic if calculated, the sub-district of perhaps being calculated the R value does not belong to frequency layer i and frequency layer i at least one provides the not preferred frequency layer of loaded service in the subscriber equipment institute receiving multicast traffic in not preferred frequency layer, and be that the business of optimized frequency layer can not be provided in not preferred frequency layer with the frequency layer j under this sub-district, F then _i=1; Otherwise F _i=0.

The gravity treatment of described sub-district is chosen the maximum sub-district of R value that calculates, as the receiving multicast traffic sub-district.

Controlling mobile equipment is selected the method for sub-district in a kind of radio communication, may further comprise the steps:

A, in the traffic frequencies layer accumulated information that the network equipment sends, contain the deviant of frequency layer in the optimized frequency layer information of carrying;

B, carry out the sub-district gravity treatment, and in the reselection criterion of sub-district, use these a plurality of deviants according to frequency layer convergence information;

C, professional in the sub-district reception of choosing.

Described step C, adopt the mass value of following formula calculation services sub-district and adjacent sub-district:

Serving cell: $R_s=Q_{\mathrm{meas},s}+{\mathrm{Qhyst}}_s+\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{F}_i*{\mathrm{Qflcoffset}}_i$

Adjacent sub-district: $R_n=Q_{\mathrm{meas},n}-{\mathrm{Qoffset}}_{s,n}+\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{F}_i*{\mathrm{Qflcoffset}}_i-{\mathrm{TO}}_n*(1-L_n)$

Wherein:

Q _{Means, s}: the received signal quality value of Serving cell;

Q _{Means, n}: the received signal quality value of adjacent sub-district;

Qhyst _s: the hysteresis of Serving cell;

Qoffset _{S, n}: the deviant of adjacent sub-district and Serving cell;

Qflcoffset _i: the deviant of i optimized frequency layer;

F _i: whether the deviant of i optimized frequency layer effectively identifies in this sub-district;

TO _n: be used for representing interim deviant;

L _n: whether the priority of Serving cell and adjacent sub-district equates in the sign layered cell structure;

Wherein, the sub-district of R value belongs to frequency layer i and frequency layer i is at least one professional optimized frequency layer in the subscriber equipment institute receiving multicast traffic if calculated, the sub-district of perhaps being calculated the R value does not belong to frequency layer i and frequency layer i at least one provides the not preferred frequency layer of loaded service in the subscriber equipment institute receiving multicast traffic in not preferred frequency layer, and be that the business of optimized frequency layer can not be provided in not preferred frequency layer with the frequency layer j under this sub-district, F then _i=1; Otherwise F _i=0.

The invention provides and make terminal can handle the situation that the multicast service that is added is positioned at different frequency layer automatically, this method can make in the terminal wireless access capability scope and provide more business for the user as far as possible, and avoided waste to terminal capability, provide the user to select professional freedom simultaneously according to the personal like.

Description of drawings

Fig. 1 is an architectural schematic in the prior art;

Fig. 2 is a MBMS multicast pattern operation flow schematic diagram in the prior art;

Fig. 3 is a MBMS broadcast mode operation flow schematic diagram in the prior art;

Fig. 4 is the schematic flow sheet of sub-district of the present invention gravity treatment;

Can Fig. 5 be preferred layer target frequency information, deviant and the professional schematic flow sheet that select the sub-district after the information such as sign that not preferred layer provides that subscriber equipment of the present invention is received network equipment transmission.

Embodiment

Below in conjunction with Figure of description the specific embodiment of the present invention is described.Use UE as subscriber equipment in the present embodiment, replace multicast service with multicast service.For broadcasting service similarly, because of broadcasting service is very close with multicast service, so related art scheme can illustrate no longer separately at this with reference to design.

The FLC information of the multicast service that the present invention sends at the network equipment is except this MBMS service identification, optimized frequency layer information, MBMS deviant, also comprises the sign that can this MBMS business be provided in not preferred frequency layer.

The user reaches shown in Figure 5 to the processing with different preferred layer business as shown in Figure 4 like this:

UE is just receiving the FLC information of another one multicast service when receiving multicast business, new multicast service has different preferred layers.

If two multicast services (two business that are positioned at different preferred layers are arranged in perhaps a plurality of multicast services) all can not be provided at not preferred layer, and UE can not receive two business on the frequency layer simultaneously, then notify the user, make a choice between ongoing business and new business by the user, UE carries out the sub-district gravity treatment according to the FLC information of selected business, receives selected business.

If at least one can be provided at not preferred layer in two multicast services (having one in perhaps a plurality of frequency layer at the most serve as that the business of preferred layer can not be not preferred layer of frequency layer that is provided with this frequency layer), then UE carries out the sub-district gravity treatment according to each professional FLC information.

Carry out method of cell reselection according to FLC information:

Revising sub-district reselection evaluation criterion is:

Serving cell: $R_s=Q_{\mathrm{meas},s}+{\mathrm{Qhyst}}_s+\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{F}_i*{\mathrm{Qflcoffset}}_i$

Adjacent sub-district: $R_n=Q_{\mathrm{meas},n}-{\mathrm{Qoffset}}_{s,n}+\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{F}_i*{\mathrm{Qflcoffset}}_i-{\mathrm{TO}}_n*(1-L_n)$

Wherein:

Q _{Means, s}The received signal quality value of Serving cell;

Q _{Means, n}: the received signal quality value of adjacent sub-district;

Qhyst _s: the hysteresis of Serving cell;

Qoffset _{S, n}: the deviant of adjacent sub-district and Serving cell;

Qflcoffset _i: the deviant of i optimized frequency layer;

F _i: whether the deviant of i optimized frequency layer effectively identifies in this sub-district;

TO _n: be used for representing interim deviant;

L _n: whether the priority of Serving cell and adjacent sub-district equates in the sign layered cell structure;

Wherein, the sub-district of R value belongs to frequency layer i and frequency layer i is at least one professional optimized frequency layer in the subscriber equipment institute receiving multicast traffic if calculated, the sub-district of perhaps being calculated the R value does not belong to frequency layer i and frequency layer i at least one provides the not preferred frequency layer of loaded service in the subscriber equipment institute receiving multicast traffic in not preferred frequency layer, and be that the business of optimized frequency layer can not be provided in not preferred frequency layer with the frequency layer j under this sub-district, F then _i=1; Otherwise F _i=0.

In addition, in FLC information, can the MBMS business identify at available 1 bit of the sign that not preferred frequency layer is provided, and for example: available 0 expression MBMS business can not be provided in not preferred frequency layer, and 1 expression MBMS business can be provided in not preferred frequency layer.

Give an example 1:

Suppose that UE detects the notice of the professional B of MBMS when receiving a MBMS business A, wherein the optimized frequency layer of professional A is F _a, the optimized frequency layer of professional B is F _bSuppose that again the sub-district that this moment, UE was stationed belongs to frequency layer F _a, professional A can not be provided in not preferred frequency layer.

UE receives the FLC information of professional B, obtains the sign that can MBMS service identification, optimized frequency layer information, MBMS deviant, this MBMS business be provided in not preferred frequency layer.

Can if show in the sign that not preferred frequency layer is provided that professional B can not be provided on not preferred frequency layer, then UE directly notifies the user, is made a choice between professional A and professional B by the user, if the user has selected professional A, then continues to receive professional A; If the user has selected professional B, then stop to receive professional A, according to the MBMS deviant Qflcoffset of professional B _bReselect the sub-district, have only a frequency layer B now, calculate the R value:

R _s＝Q _meas，s+Qhyst _s；

If adjacent sub-district n is positioned at frequency layer F _b, then:

R _n＝Q _meas，n-Qoffset _s，n+Qflcoffset _b-TO _n*(1-L _n)；

Otherwise:

R _n＝Q _meas，n-Qoffset _s，n-TO _n*(1-L _n)；

If the sub-district of choosing at last is positioned at frequency layer F _b, then UE begins to receive professional B.

If can show that professional B can be provided in the sign that not preferred frequency layer is provided on not preferred frequency layer, then calculate the R value of each sub-district:

R _s＝Q _meas，s+Qhyst _s+Qflcoffset _a+Qflcoffset _b；

If adjacent sub-district n is positioned at frequency layer F _a, then:

R _n＝Q _meas，n-Qoffset _s，n+Qflcoffset _a+Qflcoffset _b-TO _n*(1-L _n)；

If adjacent sub-district n is positioned at frequency layer F _b, then:

R _n＝Q _meas，n-Qoffset _s，n+Qflcoffset _b-TO _n*(1-L _n)；

Otherwise:

R _n＝Q _meas，n-Qoffset _s，n-TO _n*(1-L _n)；

If the sub-district of choosing at last is positioned at frequency layer F _a, then UE receives professional A and B; Otherwise the report user is selected by the user.

Give an example 2:

When the present invention carries out the sub-district gravity treatment according to frequency layer convergence information, in the reselection criterion of sub-district, use a plurality of deviants.

Suppose that UE detects the notice of the professional B of MBMS when receiving a MBMS business A, wherein the optimized frequency layer of professional A is F _a, the optimized frequency layer of professional B is F _bSuppose that again the sub-district that this moment, UE was stationed belongs to frequency layer F _a

UE receives the FLC information of professional B, obtains MBMS service identification, optimized frequency layer information, MBMS deviant.

Calculate the R value of each sub-district:

R _s＝Q _meas，s+Qhyst _s+Qflcoffset _a；

If adjacent sub-district n is positioned at frequency layer Fa, then:

R _n＝Q _meas，n-Qoffset _s，n+Qflcoffset _a-TO _n*(1-L _n)；

If adjacent sub-district n is positioned at frequency layer F _b, then:

R _n＝Q _meas，n-Qoffset _s，n+Qflcoffset _b-TO _n*(1-L _n)；

Otherwise:

R _n＝Q _meas，n-Qoffset _s，n-TO _n*(1-L _n)；

The sub-district that the user in the end chooses receives professional.

The present invention is applicable in the GSMs such as GSM/GPRS/WCDMA/TDSCDMA, provide so that terminal can be processed the situation that the multicast service that adds is positioned at different frequency layer, the beneficial effect that the method is brought automatically:

(1) provides more business for the user in the terminal wireless access capability scope as far as possible;

(2) avoided waste to terminal capability;

(3) provide the user to select professional freedom according to the personal like;

(4) in the process of cell reselection, a plurality of deviants have been used, so that the result of cell reselection more Accurately.

In a word, the above is preferred embodiment of the present invention only, is not be used to limiting guarantor of the present invention Protect scope.

Claims (11)

1, the method for controlling mobile equipment selection sub-district in a kind of radio communication is characterized in that may further comprise the steps:

A, in the traffic frequencies layer accumulated information that the network equipment sends, carry the sign that can this business be provided in not preferred frequency layer;

Can b, subscriber equipment carry out the sub-district gravity treatment in the sign that not preferred frequency layer is provided according to this business;

C, professional in the sub-district reception of choosing.

2, the method for claim 1 is characterized in that described business is a multicast service.

3, method as claimed in claim 2 is characterized in that among the described step a, and described frequency layer convergence information also comprises multicast service preferred layer frequency information and deviant;

Among the described step b, subscriber equipment carries out the sub-district gravity treatment according to multicast service preferred layer frequency information and deviant simultaneously.

4, method as claimed in claim 3 is characterized in that described step b further one of comprises the following steps:

If b11 first multicast service has identical preferred layer with second multicast service, carry out the sub-district gravity treatment according to preferred layer information and deviant;

If b12 first multicast service has different preferred layers with second multicast service, and can professional first multicast service and second multicast service of showing in the sign that not preferred frequency layer is provided all can not be provided at not preferred layer, then between first multicast service and second multicast service, make a choice, carry out the sub-district gravity treatment according to choose professional optimized frequency layer information and deviant by the user; Otherwise, carry out the sub-district gravity treatment according to the optimized frequency layer information and the deviant of a plurality of business.

5, method as claimed in claim 4 is characterized in that among described step b11 and the b12, and described first multicast service and second multicast service are meant any two business in two or more multicast services.

6, method as claimed in claim 5 is characterized in that described step b, and the mass value of following formula calculation services sub-district and adjacent sub-district is adopted in the sub-district gravity treatment:

Serving cell: $R_s=Q_{\mathrm{meas},s}+{\mathrm{Qhyst}}_s+\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{F}_i*{\mathrm{Qflcoffset}}_i$

Adjacent sub-district: $R_n=Q_{\mathrm{meas},n}-{\mathrm{Qoffset}}_{s,n}+\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{F}_i*{\mathrm{Qflcoffset}}_i-{\mathrm{TO}}_n*(1-L_n)$

Wherein:

Q _{Means, s}: the received signal quality value of Serving cell;

Q _{Means, n}: the received signal quality value of adjacent sub-district;

Qhyst _s: the hysteresis of Serving cell;

Qoffset _{S, n}: the deviant of adjacent sub-district and Serving cell;

Qflcoffset _i: the deviant of i optimized frequency layer;

F _i: whether the deviant of i optimized frequency layer effectively identifies in this sub-district;

TO _n: be used for representing interim deviant;

L _n: whether the priority of Serving cell and adjacent sub-district equates in the sign layered cell structure;

Wherein, the sub-district of R value belongs to frequency layer i and frequency layer i is at least one professional optimized frequency layer in the subscriber equipment institute receiving multicast traffic if calculated, the sub-district of perhaps being calculated the R value does not belong to frequency layer i and frequency layer i at least one provides the not preferred frequency layer of loaded service in the subscriber equipment institute receiving multicast traffic in not preferred frequency layer, and be that the business of optimized frequency layer can not be provided in not preferred frequency layer with the frequency layer j under this sub-district, F then _i=1; Otherwise F _i=0.

7, method as claimed in claim 6 is characterized in that the gravity treatment of described sub-district, chooses the maximum sub-district of R value that calculates, as the receiving multicast traffic sub-district.

8, the method for controlling mobile equipment selection sub-district in a kind of radio communication is characterized in that may further comprise the steps:

A, in the traffic frequencies layer accumulated information that the network equipment sends, contain the deviant of frequency layer;

B, carry out the sub-district gravity treatment, and in the reselection criterion of sub-district, use these a plurality of deviants according to frequency layer convergence information;

C, professional in the sub-district reception of choosing.

9, method as claimed in claim 8 is characterized in that described business is a multicast service.

10, method as claimed in claim 9 is characterized in that described step B, adopts the mass value of following formula calculation services sub-district and adjacent sub-district:

Serving cell: $R_s=Q_{\mathrm{meas},s}+{\mathrm{Qhyst}}_s+\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{F}_i*{\mathrm{Qflcoffset}}_i$

Adjacent sub-district: $R_n=Q_{\mathrm{meas},n}-{\mathrm{Qoffset}}_{s,n}+\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{F}_i*{\mathrm{Qflcoffset}}_i-{\mathrm{TO}}_n*(1-L_n)$

Wherein:

Q _{Means, s}: the received signal quality value of Serving cell;

Q _{Means, n}: the received signal quality value of adjacent sub-district;

Qhyst _s: the hysteresis of Serving cell;

Qoffset _{S, n}: the deviant of adjacent sub-district and Serving cell;

Qflcoffset _i: the deviant of i optimized frequency layer;

F _i: whether the deviant of i optimized frequency layer effectively identifies in this sub-district;

TO _n: be used for representing interim deviant;

L _n: whether the priority of Serving cell and adjacent sub-district equates in the sign layered cell structure;

Wherein, the sub-district of R value belongs to frequency layer i and frequency layer i is at least one professional optimized frequency layer in the subscriber equipment institute receiving multicast traffic if calculated, the sub-district of perhaps being calculated the R value does not belong to frequency layer i and frequency layer i at least one provides the not preferred frequency layer of loaded service in the subscriber equipment institute receiving multicast traffic in not preferred frequency layer, and be that the business of optimized frequency layer can not be provided in not preferred frequency layer with the frequency layer j under this sub-district, F then _i=1; Otherwise F _i=0.

11, method as claimed in claim 10 is characterized in that the gravity treatment of described sub-district, chooses the maximum sub-district of R value that calculates, as receiving service district.

Images