CN101500278A - Method, apparatus and system for selecting wireless network cell - Google Patents
Method, apparatus and system for selecting wireless network cell Download PDFInfo
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- 230000008569 process Effects 0.000 abstract description 15
- 238000010295 mobile communication Methods 0.000 abstract description 5
- 230000005484 gravity Effects 0.000 description 6
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- 230000005540 biological transmission Effects 0.000 description 3
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Abstract
The invention relates to the technical field of mobile communication, in particular to a method for selecting a wireless network cell, comprising the following steps: a system message issued by a wireless network base station is received, and the system message comprises the information of two or more public land mobile networks (PLMNs); the system message is analyzed, and the information of the PLMNs is obtained; a target PLMN is selected; and the wireless network cell is selected according to the target PLMN. By applying the method, the system message received during the cell selection/reselection process by user equipment comprises a plurality of PLMN ID, therefore, the user equipment can select the target PLMN according to PLMN ID, and further selects the target cell, thus avoiding that the UE can not select the target cell, which is caused by not broadcasting a plurality of the PLMN ID in the cell. Accordingly, the invention also discloses a device and a system for selecting the wireless network cell.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly a kind of method, Apparatus and system of selecting wireless network cell.
Background technology
Be accompanied by the quick growth of mobile subscriber's quantity and the aggravation of mobile communication operators market competition, cause mobile communication carrier may have the mobile network of two or more network No.s in an area; In addition, mobile communication carrier according to the needs of business development, has built 3G network in operation 2G network, and this just need enable new network number (MNC) and shine upon mutually with mobile subscriber number (MSISDN).
Subscriber equipment (User Equipment, UE) process of search network comprise select public land mobile network (Public Land Mobile Network, PLMN) with select two processes in sub-district.PLMN is made up of a plurality of sub-districts usually, and UE generally can at first select or the gravity treatment Home PLMN in the process of carrying out cell selecting or gravity treatment, selects proper cell to realize being stationed then in the sub-district under described Home PLMN.
In 3GPP Rel-6 version, introduced the network sharing characteristic, promptly be to allow a plurality of operators to use a wireless access network simultaneously.According to the regulation of 23.251 agreements, described wireless access network is mainly the network configuration of two kinds of forms, the network core net (Gateway Core Network, GWCN) and MOCN (Multi-Operator Core Network, MOCN).No matter be in the GWCN network configuration or in the MOCN network configuration, Radio Access Network is all shared by a plurality of operators and is used.In the prior art, each sub-district is merely able to broadcast a PLMN ID, so UE is in the process of carrying out cell selecting/gravity treatment, the cell selecting that makes the mistake possibly.If for example certain sub-district supported PLMN 1 and PLMN2, but in the broadcasting process of system message, SIB18 in fact only carries PLMN1.Carry out cell reselection process if belong to the UE of PLMN2 in the current area originally, only found that then this neighbor cell only broadcasted PLMN1, in this case, UE then can not reselect to described neighbor cell.
Summary of the invention
The embodiment of the invention provides a kind of method, Apparatus and system of selecting wireless network cell, insert in the process of sub-district to solve at subscriber equipment, be merely able to broadcast the problem of a PLNM ID in the system message, to help UE select or the process of gravity treatment wireless network cell in can select or gravity treatment to Target cell.
For addressing the above problem, the embodiment of the invention provides a kind of method of selecting wireless network cell, comprising:
Receive the system message that wireless network base station issues, comprise the information of two or more public land mobile network PLMN in the described system message;
Resolve described system message, obtain the information of described PLMN;
Select target PLMN;
According to described target P LMN, select wireless network cell.
Correspondingly, the embodiment of the invention also provides a kind of device of selecting wireless network cell, comprising:
Receiving element is used to receive the system message that wireless network base station issues, and comprises the information of two or more PLMN in the described system message;
Resolution unit is used to resolve described system message, obtains the information of two or more PLMN;
The public land mobile network selected cell is used for the information according to the described PLMN that obtains, select target PLMN;
The cell selecting unit is used for according to described target P LMN, selects wireless network cell.
Correspondingly, the embodiment of the invention also provides a kind of system of selecting wireless network cell, comprising:
Wireless network base station is used for update system message, comprises the system message of PLMN information to subscriber equipment broadcasting;
Radio network controller is used for carrying out system message update to described wireless network base station request;
Subscriber equipment is used for the information according to the PLMN of described wireless network base station broadcasting, selects wireless network cell.
Compared with prior art, the embodiment of the invention is expanded the system message that is sent to UE, in described system message, carry a plurality of PLMN id informations, therefore UE can receive a plurality of PLMN ID of neighbor cell, according to the PLMN ID select target PLMN that receives, and then selection or gravity treatment are to the target radio network sub-district.
Description of drawings
Fig. 1 is an embodiment of the invention method flow diagram;
Fig. 2 is that embodiment of the invention system message issues flow chart;
Fig. 3 is that the embodiment of the invention is selected the PLMN method flow diagram;
Fig. 4 is the structure drawing of device that the embodiment of the invention is selected wireless network cell;
Fig. 5 is the system construction drawing that the embodiment of the invention is selected wireless network cell.
Embodiment
Below in conjunction with drawings and Examples the present invention is done detailed explanation.See also the method flow diagram that Figure 1 shows that the embodiment of the invention, comprise step:
Step S101: receive the system message that wireless network base station issues, comprise the information of two or more PLMN in the described system message;
Step S102: resolve described system message, obtain the information of described PLMN;
Step S103: select target PLMN;
Step S104:, select wireless network cell according to described target P LMN.
The information that UE obtains PLMN in the embodiment of the invention obtains by obtaining system message, and the flow chart that UE obtains described system message sees also shown in Figure 2, specifically comprises:
Step 201: radio network controller (Radio Network Controller, RNC) by the Iub interface transmitting system information updating request (SystemInformation Update Request) between RNC and the Node B (NODE B) to NODE B, in the wherein said system message update request message, comprise the encoding code stream of the system message that all need upgrade;
Step 202:NODE B receives described system message update request, and answering system information updating response (System Information Update Response) is notified described RNC system message update success to described RNC;
Step 203: described NODE B is by broadcast channel (Broad Channel, BCH) broadcasting updated system messages all UE to the sub-district.
Issue in the process in above-mentioned system message, (Transmission Time Interval TTI) is 20ms to the Transmission Time Interval of BCH transmission channel, and described NODE B is every the 20ms broadcast system message.
Interface between described RNC and the UE is the Uu interface, and at described Uu interface, described system message is that unit broadcasts and issues with block of information (System Information Block).In different block of information, include different system message contents.The current defined System information block of 25.331 agreements comprises: and Master Information Block (Master Information Block, MIB), Scheduling Block 1 (Scheduling Block1, SIB1), SIB2 and other System information block (as SIB3, SIB4 ... SIB18).
In SIB18, comprised the information of the PLMNID of the neighbor cell of sub-district, place under idle pulley and the connection mode, specifically see also 25.331 agreements, wherein each neighbor cell is only broadcasted a PLMNID.
According to method provided by the present invention, in enforcement of the present invention, in the example, when UE needs the selection/reselection wireless network cell, at first need to carry out the step of selecting PLMN.The PLMN information of described UE current area is that the MIB from the system message that broadcast this sub-district obtains, and the PLMN information of neighbor cell then needs to obtain from the SIB18 of described system message.After the UE start, or when needing re-accessing network, obtain PLMN information, it is shown in Figure 3 to select the idiographic flow of PLMN to see also, and specifically comprises step:
Step S301:UE scans all universal mobile telecommunications system, and (Universal MobileTelecommunication System, UMTS) frequency are sought available PLMN information;
On each frequency, the strongest cell information of UE meeting search signal intensity, and receive the strongest system message that the sub-district sent of described signal, get access to PLMN information, and described PLMN information is reported to the Non-Access Stratum of UE.According to the regulation of 25.331 agreements, the PLMN information of current area is to obtain from the MIB of system message, and the PLMN information of neighbor cell is to obtain from the SIB 18 of system message.Wherein, the included information of SIB 18 is as shown in table 1, and neighbor cell PLMN id information is as shown in table 2.
Table 1
| Information Element/Group name | Need | Multi | Type and reference | Semantics description | Version |
| Idle mode PLMN identities | OP | PLMN identities of neighbour cells 10.3.7.53a | |||
| Connected mode PLMN identities | OP | PLMN identities of neighbour cells 10.3.7.53a | |||
| Idle mode PLMN identities for SIB 11bis | OP | PLMN identities of neighbour cells 10.3.7.53a | REL-6 | ||
| Connected mode PLMN identities for SIB 11bis | OP | PLMN identities of neighbour cells 10.3.7.53a | REL-6 |
Table 2
| Information Element/Group name | Need | Multi | Type and reference | Semantics description |
| PLMNs of intra-frequency cells list | OP | 11to <maxCell Meas> | ||
| >PLMN identity | OP | PLMN identity 10.3.1.11 | Action when not present is specified in subclause 8.1.1.6.18. | |
| Multiple PLMN List | OP | Multiple PLMN List 10.3.1.7ax x | If present，this IE specifies the PLMNs of the cell.If absent，the IE“PLMN Identity”specifies the PLMN of the cell. | |
| PLMNs of inter-frequency cells list | OP | 11to <maxCell Meas> | ||
| >PLMN identity | OP | PLMN identity 10.3.1.11 | Action when not present is specified in subclause 8.1.1.6.18. | |
| Multiple PLMN List | OP | Multiple PLMN List 10.3.1.7ax x | If present，this IE specifies the PLMNs of the cell.If absent，the IE“PLMN Identity”specifies the PLMN of the cell. | |
| PLMNs of inter-RAT cells list | OP | 1 to <maxCell Meas> | ||
| >PLMN identity | OP | PLMN identity 10.3.1.11 | Action when not present is specified in subclause 8.1.1.6.18. | |
| Multiple PLMN List | OP | Multiple PLMN List 10.3.1.7ax x | If present，this IE specifies the PLMNs of the cell.If absent，the IE“PLMN Identity”specifies the PLMN of the cell. |
Step S302:UE resolves described system message, gets access to the included two or more PLMN id informations of MIB and SIB18;
Step S303:UE is according to the described PLMN ID that obtains, select target PLMN;
Step S304:UE starts the cell selecting program according to described selected target P LMN.
According to the method for above-mentioned selection PLMN, when described UE can maybe need to reselect the sub-district after start, the sub-district that the search signal quality is the strongest, and receive the system message of described Cell Broadcast CB.
After described UE finishes the selection of PLMN, need finish the process of cell selecting.Under general situation, comprise a plurality of sub-districts among each PLMN, therefore described UE need select suitable cell, and final the realization quarters in this sub-district.
In the present embodiment, may store a plurality of information of specific cell among the described UE, at this moment, can carry out the selection of specific cell according to the priority orders of these information of specific cell, also can measure signal quality, the signal strength signal intensity of these specific cells, carry out the selection of specific cell according to signal quality or signal strength signal intensity, perhaps, can also be according to user institute requested service type, from above-mentioned specific cell, select specific cell, certainly, can adopt the selection mode of other specific cells, these selection modes all do not influence realization of the present invention yet.
Present embodiment is an example to carry out cell selecting according to cell signal strength.Before carrying out cell selecting, UE need carry out wireless measurement to these sub-districts, according to the intensity of wireless signal, selects a sub-district, and quarters at described selected sub-district.
In the cell selecting process, UE according to self ability scan all radio frequencies (RadioFrequency, RF) channel comes the ferret out sub-district, on each carrier frequency, a device the strongest sub-district of search signal, in case Target cell is found, then device is attempted being stationed in this selected sub-district.Select the sub-district to be based on the S criterion according to signal strength signal intensity, if the signal of sub-district satisfies the standard of S criterion, i.e. S
Rxlev0 and S
Qual0, wherein
S
qual＝Q
qualmeas-Q
qualmin
S
rxlev＝Q
rxlevmeas-Q
rxlevmin-P
compensation
S herein
RxlevThe expression cell selecting receives class value, S
QualThe expression cell selection quality value, Q
QualmeasRepresent measured cell quality value, Q
RxlevmeasRepresent that measured sub-district receives class value, Q
QualminThe required minimum mass value in sub-district, Q are selected in expression
RxlevminThe needed minimal level value in sub-district, P are selected in expression
CompensationExpression path loss offset.
After selecting Target cell and being stationed successfully, described UE will initiate " location registers " flow process, and the position to network registry self place is so that follow-up initiation service request.
Embodiment according to the invention described above, when UE starts shooting or need carry out cell selecting again, according to the signal strength signal intensity search cell, and receive the system message of this Cell Broadcast CB, in the MIB and SIB18 of described system message, can get access to a plurality of PLMN id informations, so UE can be according to a plurality of PLMN ID that get access to, select target PLMN, thereby select target sub-district.
Correspondingly, the embodiment of the invention also provides a kind of device of selecting wireless network cell, specifically sees also shown in Figure 4ly, comprising:
Receiving element 401 is used to receive the system message that wireless network base station issues, and comprises the information of two or more PLMN in the described system message; Resolution unit 402 is used to resolve described system message, obtains the information of two or more PLMN; Public land mobile network selected cell 403 is used for the information according to the described PLMN that obtains, select target PLMN; Cell selecting unit 404 is used for according to described target P LMN, selects wireless network cell.
In addition, described cell selecting unit 404 also comprises signal strength signal intensity recognin unit 4041, is used to discern the signal strength signal intensity of the affiliated wireless network cell of described PLMN; Cell selecting judgement subelement 4042 is used for the signal strength signal intensity of the wireless network cell discerned according to described signal strength signal intensity recognin unit, selects wireless network cell.
In addition, described device also comprises is stationed unit 405, is used to be stationed described wireless network cell; Registering unit 406 is used for after being stationed described wireless network cell, to the network registry position.
According to device provided by the present invention, in another embodiment of the present invention, when needs selection/reselection wireless network cell, described device at first needs to carry out the step of selecting PLMN.The PLMN information of current area is to obtain from the MIB that broadcast this sub-district, and the PLMN information of neighbor cell then is to obtain from the SIB 18 of described system message.
Described device scans all UMTS frequencies after start, seek available PLMN information.On each frequency, the strongest cell information of described device meeting search signal intensity, and pass through the system message that receiving element 401 receives described Cell Broadcast CB, get access to PLMN information, and described PLMN information is reported to the Non-Access Stratum of described device.According to the regulation of 25.331 agreements, the PLMN information of current area is to obtain from the MIB of system message, and the PLMN information of neighbor cell is to obtain from the SIB18 of system message.Wherein, SIB 18 included information see also above-mentioned table 1, and neighbor cell PLMN id information sees also above-mentioned table 2.
Described device gets access to a plurality of PLMN ID included among the SIB 18 by the system message of the described Cell Broadcast CB of resolution unit 402 parsings.According to the described PLMN ID that gets access to, and safeguard available PLMN tabulation.
Described device is according to the PLMN ID that gets access to, by public land mobile network selected cell 403 select target PLMN.After finishing the step of selecting PLMN, start the cell selecting program.Present embodiment is by the signal strength signal intensity of the included sub-district of the described PLMN of identification, and then the select target sub-district.Select the sub-district to be based on the S criterion according to signal strength signal intensity, specifically see also the record of top embodiment.In the cell selecting process, described device is discerned the signal strength signal intensity of each included sub-district of described PLMN by signal strength signal intensity recognin unit 4041, and adjudicates subelement 4042 by cell selecting and judge the sub-district that meets the S criterion, and the select target sub-district.
After finishing the selection step of sub-district, described device initiates to be stationed by being stationed unit 405, is stationed described selected wireless network cell, and passes through registering unit 406 to network registry self position, so that follow-up initiation service request.
Embodiment according to the invention described above, when device is started shooting or need be carried out cell selecting again, according to the signal strength signal intensity search cell, and receive the system message of this Cell Broadcast CB, in the SIB18 of described system message, can get access to a plurality of PLMN id informations, so UE can be according to a plurality of PLMNID that get access to, select target PLMN, and then select target sub-district.
Correspondingly, the embodiment of the invention also provides a kind of system of selecting wireless network cell, sees also shown in Figure 5ly, comprises wireless network base station 501, is used for update system message, comprises the system message of PLMN information to subscriber equipment broadcasting; Radio network controller (Radio Network Controller, RNC) 502, be used for carrying out system message update to described wireless network base station request; Subscriber equipment 503 is used for the information according to the PLMN of described wireless network base station broadcasting, the select target wireless network cell.
Use system provided by the present invention, in another embodiment of the present invention, described wireless network base station 501 is specially NODE B.In the process of selecting wireless network cell, RNC 502 by the Iub interface transmitting system information updating request between RNC and the NODE B 501 to NODE B 501, in the wherein said system message update request, include the encoding code stream of the system message that needs renewal.
Described NODE B 501 receives described system message update request, and the response of answering system information updating is notified described RNC system message update success to described RNC 502.
The subscriber equipment 503 of described NODE B 501 broadcasting updated system messages to the neighbor cell, in the SIB 18 of described updated system messages, include two or more PLMN ID, therefore described subscriber equipment 503 is after receiving described PLMN ID, can select target PLMN, then according to described selected PLMN select target sub-district and quarter in this sub-district.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (12)
1, a kind of method of selecting wireless network cell is characterized in that, comprising:
Receive the system message that wireless network base station issues, comprise the information of two or more public land mobile network PLMN in the described system message;
Resolve described system message, obtain the information of described PLMN;
Select target PLMN;
According to described target P LMN, select wireless network cell.
2, method according to claim 1 is characterized in that, the system message that the reception wireless network base station issues is specially:
Subscriber equipment receives the System information block SIB18 that the current area wireless network base station issues.
3, method according to claim 2 is characterized in that, resolves described system message, obtains PLMN information and is specially:
Resolve described SIB18, obtain the information of the affiliated PLMN of neighbor cell.
4, method according to claim 3 is characterized in that, according to described PLMN, selects wireless network cell to be specially:
Discern the signal strength signal intensity of the affiliated wireless network cell of described PLMN, select wireless network cell.
5, according to each described method of claim 1-4, it is characterized in that the information of obtaining described PLMN is specially:
Obtain the only cognizance code of described PLMN.
According to each described method of claim 1-4, it is characterized in that 6, after subscriber equipment was selected wireless network cell, described method also comprised:
Described subscriber equipment is stationed in described wireless network cell, and to the network registry position.
7, a kind of device of selecting wireless network cell is characterized in that, comprising:
Receiving element is used to receive the system message that wireless network base station issues, and comprises the information of two or more PLMN in the described system message;
Resolution unit is used to resolve described system message, obtains the information of two or more PLMN;
The public land mobile network selected cell is used for the information according to the described PLMN that obtains, select target PLMN;
The cell selecting unit is used for according to described target P LMN, selects wireless network cell.
8, device according to claim 7 is characterized in that, described cell selecting unit comprises:
Signal strength signal intensity recognin unit is used to discern the signal strength signal intensity of the wireless network cell under the described PLMN;
Cell selecting judgement subelement is used for the signal strength signal intensity of the wireless network cell discerned according to described signal strength signal intensity recognin unit, selects wireless network cell.
9, device according to claim 7 is characterized in that, described device also comprises:
Be stationed the unit, be used to be stationed described wireless network cell;
Registering unit is used for after being stationed described wireless network cell, to the network registry position.
10, a kind of system of selecting wireless network cell is characterized in that, comprising:
Wireless network base station is used for update system message, comprises the system message of PLMN information to subscriber equipment broadcasting;
Radio network controller is used for carrying out system message update to described wireless network base station request;
Subscriber equipment is used for the information according to the PLMN of described wireless network base station broadcasting, selects wireless network cell.
11, system according to claim 10 is characterized in that, the system information of the wireless network base station broadcasting that subscriber equipment receives is specially:
Subscriber equipment receives the System information block SIB18 that the current area wireless network base station issues.
12, system according to claim 11 is characterized in that, subscriber equipment is specially according to the Information Selection wireless network cell of PLMN:
Subscriber equipment is according to the only cognizance code of the PLMN that comprises among the SIB18, and select target PLMN selects wireless network cell then in described target P LMN.
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