CN101466147A - Paging control system for isomery network and paging method thereof - Google Patents
Paging control system for isomery network and paging method thereof Download PDFInfo
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Abstract
The invention provides a paging control system and a paging signaling method of a heterogeneous network, which comprises a wireless access network and a wired access network, a mobile management entity MME, and a combined paging function entity CPC. The mobile management entity MME provides the three-layer connections which are kept between the heterogeneous network and the movable terminal; the system can realizes interconnection and switching among the various heterogeneous access networks through the combined paging function entity CPC; and the CPC is used for the paging function of the heterogeneous network so as to obtain the capability of the movable terminal, the status information and the residency information of the movable termination, and selects a proper carrier network for the mobile terminal according to the type and the characteristic of the business flow. Utilizing the method improves the paging regional security and reliability, and reduces the paging signaling expenditure and the position updating signaling expenditure.
Description
Technical field
The present invention relates to the mobile communications network field, more specifically, the present invention relates to a kind of paging control system and paging method thereof of heterogeneous network.
Background technology
Following 4G system entails faces the situation of multiple wireless access technology coexistence, therefore at system architecture evolution (System Architecture Evolution, SAE) introduced the mechanism of isomery paging in, and the interconnected and fusion between the multiple wireless access technology has also been brought into the demand of 4G system.
In mobile cellular network, network side uses paging operation to ask to be in its positional information of mobile terminal to update under the idle pulley and it is transformed into connection status.Paging mechanism also can be saved the energy consumption of portable terminal, because when not having transfer of data, can be converted to idle condition.Under idle condition, portable terminal does not send and receives user's transmission data, and only monitors down link, is PICH channel and PCH channel in the 3G system.After portable terminal is registered to network, will be assigned to a paging group, when beep-page message need send to any one portable terminal in this paging group, paging indication (PI) information will appear on the Page Indication Channel PICH periodically.In case detect PI, terminal is deciphered the next PCH frame that sends on the auxilliary CCPCH channel, to confirm whether to have one's own beep-page message; When PI indication decision reliability reduced, portable terminal also needed PCH is deciphered equally.
In existing systems, network side will carry out paging to portable terminal by different access networks, yet in different wireless access systems, paging mechanism is different with paging cycle, a portable terminal is carved the paging indication of monitoring all arrivals when not required, and in specific paging cycle, the periodic monitoring.The frequency that paging indication occurs is more little, and then the number of times that wakes up from park mode of portable terminal is just few more, and the life-span of battery is also just long more.For mixing heterogeneous wireless network, this problem is especially obvious, because the different radio access network, its battery saving mode is different.
In order to realize the saving energy consumption of portable terminal, prolong the stand-by time of portable terminal, portable terminal and network are cooperatively interacted, allow the portable terminal can both convenient work under plurality of communication schemes, guarantee that its seamless roam and switching between heterogeneous radio access networks are the IMT-Advanced problem demanding prompt solutions.And roaming and the switching location management that relate to portable terminal of portable terminal in heterogeneous radio access networks.Under heterogeneous network, if design does not efficiently support that the location update message of portable terminal and the expense of beep-page message will be very huge.
With the dual-mode wireless portable terminal is example, and working in the overlapping region at two heterogeneous wireless networkings, there are the following problems in meeting:
1) if portable terminal is operated under two patterns simultaneously, can obtain the service of two wireless networks simultaneously, but upgrade because will in two networks, carry out the position, also will monitor beep-page message, certainly will cause too much position renewal signaling consumption and energy consumption from two network sides;
2) if only work is in one mode constantly certain for portable terminal, will reduce the position upgrades signaling consumption and saves the limited energy consumption of portable terminal, but can not effectively monitor from the beep-page message of the network side of mode of operation not, thereby the wireless communication that causes closing air interface can not be set up effectively.
In addition, in actual applications, communications of Mobile Terminals is professional may major part only to come from a wireless network, and another wireless network has only communication service seldom to take place, at this moment allow portable terminal monitor two wireless networks simultaneously, particularly need traffic carrying capacity that network is seldom carried out the acceptance of beep-page message and carries out the position renewal, certainly will bring very many unnecessary energy consumption and signaling load, make that the network power consumption is unbalanced.
Except above-mentioned energy consumption problem, the problem that need consider for the isomery paging mechanism also has division, safety issue, integrity problem and the call signaling expense of paging domain and position to upgrade problems such as signaling consumption, need also to consider that can these mechanism coexist in all communication wireless technologys, no matter whether these access networks exist the paging function of oneself.
Summary of the invention
Mobile terminal power consumption is big in the existing paging mechanism, the position is upgraded and the big defective of expense waste of monitoring signaling in order to overcome, and the present invention proposes a kind of paging control system and paging method thereof of heterogeneous network.
According to an aspect of the present invention, proposed a kind of paging control system of heterogeneous network, having comprised:
One or more access network;
Mobility Management Entity MME is used for providing being connected of keeping between described one or more access network and the portable terminal by it;
United paging functional entity CPC, described CPC links to each other with MME, be used for making described access network to the portable terminal paging by described MME, described CPC obtains the presence information of ability, state information and the portable terminal of portable terminal, and, be that portable terminal is selected suitable bearer network according to the type and the feature of Business Stream.
Wherein, described access network comprises Radio Access Network and cable access network, and wherein, described Radio Access Network comprises 4G Access Network, 3G access network, WLAN and WiMAX, and described cable access network comprises fixed network NGN, Internet, PSTN and ISDN.
Wherein, exist under user's registration scenarios at network side CPC, network side CPC obtains user state information and according to the demand of Business Stream and the situation of access network, the network of selection paging is used for the data transmit-receive of portable terminal.
Wherein, do not exist under user's registration scenarios at network side CPC, network side CPC carries out the initialization paging service according to the network of last paging, by the network of user and access network decision carrying mobile terminal service.
Wherein, its paging position of portable terminal real-time update and performance keep status of mobile terminal information and network side CPC synchronous to network side CPC.
According to a further aspect in the invention, proposed the method for a kind of isomerization access network paging control signaling, wherein, the user is registered to the united paging functional entity CPC of network side with its state information, and described method comprises:
The data flow of step 10), the directed portable terminal of Mobility Management Entity MME connects with CPC, and asks the paging Radio Link according to feature, strategy and the state of portable terminal after triggering;
Step 20), CPC obtains the wireless link information of portable terminal and the location updating message of portable terminal, the ability and the coverage information of the diverse network that can support to core network request portable terminal;
Step 30), CPC will come the paging portable terminal by selected network, institute's paging to portable terminal the connection status of eating dishes without rice or wine to be converted to of this network;
Step 40), the packet received by selected forwarded of MME is given portable terminal.
Wherein, step 10) also comprises: provide the relevant information of Business Stream to CPC in the time of MME paging Radio Link.
Wherein, step 20) also comprise: CPC carries out the initialization paging by the link that is in connection status of portable terminal, and described initialization paging information comprises location updating message, the status of mobile terminal information of asking portable terminal.
Wherein, step 30) also comprises:, this is eated dishes without rice or wine to be changed to idle condition, the binding of notice MME scheduler if when portable terminal no longer needs the initialization paging network.
According to another aspect of the invention, provide a kind of method of isomerization access network paging control signaling, wherein, there is not state of user information in the united paging functional entity CPC of network side, and described method comprises:
Step 10), communication service of Mobility Management Entity MME initialization is to portable terminal and notify CPC, CPC according to before link information select a plurality of bearer networks to come the paging portable terminal;
Step 20), after portable terminal therefrom selects bearer network according to service needed, inform the Radio Link that CPC notifies MME and portable terminal to connect;
Step 30), MME uses described Radio Link and portable terminal to connect, and carry out the initialization paging by this selected Radio Link when next paging.
Wherein, step 10) also comprises: the CPC network that automatic selection will be carried according to former link information, send beep-page message in proper order by selected a plurality of bearer networks, wherein, if portable terminal is not received first paging information, just can send second paging information.
According to a forth aspect of the invention, provide a kind of portable terminal between heterogeneous network, to upgrade the method for position, having comprised:
Step 10), open a kind of mode of operation when portable terminal does not have business and eat dishes without rice or wine accordingly, in corresponding network, carrying out the position and upgrading;
Step 20), the united paging functional entity CPC of core net shares the positional information of portable terminal between the different radio Access Network, portable terminal is registered on the usertracking zone TA that a plurality of CPC preserves;
Step 30), under mode of operation, keep a special-purpose TA, in special-purpose TA, carry out the paging of portable terminal, CPC keeps a clock, write down the interval that the position among the special-purpose TA is upgraded, overtime and will carry out paging by other TA of this portable terminal registration and notify it to carry out the position upgrading when not having occurrence positions to upgrade;
Step 40), after portable terminal shifts out existing network, open other mode of operations and notify CPC.
Under the page-mode of multicast, if the multicast network interface is not having under the professional situation about connecting, can not receive paging information, needn't remove to read PCH, only in the time of business, enter communications status after the triggering mobile terminals access network, enter idle condition behind the end of conversation, the access network of when call business next time, starting shooting again once more.Equally, when the multicast interface is in connection status and clean culture interface when being in idle condition, the clean culture interface can not receive paging information, needn't remove to read PCH, will save very big energy consumption.
Description of drawings
Fig. 1 is a heterogeneous network paging control system structural representation;
Fig. 2 is a heterogeneous network paging control system protocol stack schematic diagram;
Fig. 3 is the heterogeneous network paging schematic flow sheet based on login mechanism;
Fig. 4 is not for there being the heterogeneous network paging schematic flow sheet of registration;
Fig. 5 is the flow chart of heterogeneous network location updating method.
Embodiment
Be described in detail below in conjunction with the paging control system and the paging method thereof of the drawings and specific embodiments a kind of heterogeneous network provided by the invention.
In the 4G system, after portable terminal is registered to network, will be assigned to a paging group, when beep-page message need send to any one portable terminal in this paging group, paging indication (PI) information will appear at Page Indication Channel PICH periodically and go up (on the PDCCH among the LTE).In case detect PI, terminal goes up the next PCH frame that sends to auxilliary CCPCH channel (on the PDSCH among the LTE) and deciphers, to confirm whether to have one's own beep-page message; When PI indication decision reliability reduced, portable terminal also needed PCH is deciphered equally.Because a PI includes a plurality of UE, so when the periodic monitor channel of UE, and when receiving PI information under own, many times will be unnecessary go read the PCH channel, causes unnecessary energy consumption.
Under such mixing heterogeneous network environment, need to design the energy consumption that effectively reduces portable terminal most, to reach the purpose of using multiple wireless access technology to offer high-quality service as the user.Existing voice cell phone under most situation, except connecting phone, all can be in idle condition.In the 4G communication system, the form of communication and the type of service all can have very big growth, even but like this, what the wave point of portable terminal also can be frequent is transformed under the battery saving mode.Therefore, for most service, it is necessary that paging mechanism remains.In fact, the service of dramatic growth will bring more substantial paging request in the future network system, and portable terminal will not only be come paging by speech business, and will be served paging by other.In this case, paging mechanism effective and power saving will not only use the paging function of single wireless technology.Therefore, need a kind of new paging mechanism of design, this paging mechanism not only is applicable to certain specific wireless technology, but will be applied to the heterogeneous wireless network environment.The heterogeneous network paging function will fully be integrated the paging mechanism of existing various access networks as instrument, and different Radio Links will be provided by the paging function that provides for a certain particular access network.
The present invention proposes a kind of heterogeneous network paging scheme at the 4G system, paging problem in the time of can effectively solving portable terminal and insert multiple wireless network at the same time, introduce the CPC functional entity in the system and method for the present invention, be responsible for the paging control between the heterogeneous network.And, the paging mechanism of two kinds of different heterogeneous network systems is proposed: based on the paging mechanism of registration and the paging mechanism of nothing registration at two kinds of different situations.Under login mechanism, network side is understood user state information, and according to the demand and the network condition of Business Stream, need to select the network of paging; Under no login mechanism, network side will use the network of last paging to carry out the initialization paging service, and by user and the common decision of access network will on which network bearer service.No matter use which kind of paging mechanism, portable terminal is not receiving under the data conditions, will reside in an access network, and the information on can other networks of paging on this access network.
Basic embodiment of the present invention is as follows: in the isomery paging mechanism based on registration, the ability that requires its paging position of portable terminal real-time update and itself is to network side, keeps their state information etc. synchronous with network side.Fig. 1 illustrates paging control signaling system structure, and in network environment figure as shown in Figure 1, the access network of heterogeneous system will be made of Radio Access Network, cable access network and other network; Wherein Radio Access Network comprises 4G Access Network, 3G access network, WLAN and WiMAX etc.; Cable access network comprises fixed network NGN, Internet, access networks such as PSTN, ISDN; Other networks will be the following access networks that occurs.The functional entity that constitutes paging control signaling system also includes Mobility Management Entity (Mobility Management Entity, MME), MME will provide one with portable terminal between the moment keep 3 layers to be connected, that is to say, different access networks is connected with portable terminal by MME; Paging control signaling system is introduced united paging functional entity (Cooperative Paging Center, CPC), will be by united paging functional entity (Cooperative Paging Center, CPC) realize and multiple heterogeneous access networks between interconnection and switch, CPC is an equipment of the core network in the 4G system, is responsible for the paging function of heterogeneous network, and CPC will understand that the ability of portable terminal, state information, and the presence information of portable terminal etc.CPC will avoid the unnecessary wave point state exchange of portable terminal for the user selects suitable bearer network according to the type and the feature of Business Stream.
Fig. 2 illustrates the protocol stack model of paging control signaling system.Physical layer and mac-layer protocol by each Access Network oneself between subscriber equipment and the Access Network communicate.Mobile management functional entity by each Access Network between Access Network and the core network utilizes the IP agreement to communicate, dissimilar Access Networks communicates at the IP layer by locomotive function management entity separately, and each functional entity in the control system communicates by core I Pv6 network.In the protocol stack model of Fig. 2, IP handles Internet Protocol the sublayer, comprises the foundation of IP (v6) route, the foundation of MPLS label switched path, route querying and data forwarding etc.Be the signaling key-course more than three layers, use the SCTP transport layer protocol, provide the signaling support between heterogeneous network, carrying out paging operation.
Fig. 3 illustrates first embodiment of the heterogeneous network paging method according to the present invention, suppose that portable terminal has 3 wave point (RAT, corresponding to three Radio Access Networks), RAT1 is in connection status, RAT2 is in idle condition and RAT3 is in closed condition, and is as follows based on the paging mechanism idiographic flow step of registration:
S3.1, MME will be triggered by a data flow request of pointing to portable terminal;
S3.2, MME will connect with CPC after receiving solicited message, and according to feature, strategy and its one or more Radio Links of state request paging of portable terminal, meanwhile, MME will provide the relevant information of Business Stream;
S3.3, CPC recognize the link information of portable terminal, and RAT1 is in connection status, will carry out initialized paging work by the RAT1 link, and described initialization information comprises the location updating message of asking portable terminal, the state information of portable terminal itself etc.;
S3.4, portable terminal will be given CPC desired information-reply;
The ability and the coverage information of the diverse network that S3.5, CPC will can support according to portable terminal, and the suitable bearer network of the Information Selection of Business Stream, and carry out paging, described selection network parameter comprises fail safe, power consumption, qos parameter (comprise time delay, packet loss, the shake), expense, bandwidth etc.;
S3.6, select suitable network RAT2 after, CPC will arrive in case portable terminal is paged by selected ICQ portable terminal, terminal will eat dishes without rice or wine to be converted to connection status to its RAT2;
If the S3.7 portable terminal no longer needs the RAT1 network, the RAT1 interface can be changed to idle condition, and notice MME upgrades the IP address binding of oneself;
S3.8, last, MME gives portable terminal by the packet that the RAT2 forwarded is received.
In according to another embodiment of the invention, in the isomery paging mechanism that does not have registration, do not need any information of registered in advance, multi-module mobile terminal does not need to any its ability and the state information of network side report, and CPC only needs on the portable terminal very finite information.CPC infers the positional information that portable terminal is possible according to the last network condition that connects of portable terminal and the last position news more.
Provide the construction method of isomerization access network paging control signaling system according to another embodiment of the invention, wherein for there is not the paging mechanism flow process of registration based on the user.Fig. 4 illustrates another embodiment of the heterogeneous network paging method according to the present invention, consults Fig. 4, and the detailed process of paging is as follows:
S4.1, communication service of MME initialization are to portable terminal B, but it does not understand the location updating message of portable terminal B, and the application service functional entity will be notified CPC;
S4.2, since CPC do not understand status of mobile terminal information yet, it can only be according to former link information, the network that automatic selection will be carried, message S4.2a and S4.2b will send by RAT1 and RAT3 network, these two message will be sent successively, if do not receive first information, just can send second information;
S4.3, after portable terminal is received beep-page message, according to service needed, will select to come bearer service with any network, S4.3a-S4.3c message is the indication information that portable terminal sends to each access network, network side and portable terminal will unite determine will bearer service access network;
S4.4, after selecting bearer network RAT3, portable terminal will reply to CPC by selected network;
S4.5, CPC will notify MME, how to connect with portable terminal;
The information that S4.6, MME transmit according to CPC, will and portable terminal between connect, when next paging information arrives, will at first pass through RAT3 netinit paging.
One embodiment of the present of invention provide a kind of subscriber equipment to carry out the position method for updating between dissimilar Access Networks, consult Fig. 5, and its flow process is as follows:
S5.1, in order to save energy consumption, portable terminal do not have professional in, only need work in one mode, open corresponding air interface, and in corresponding system, carrying out the position and upgrading, and needn't in other system, carry out any operation;
On the CPC functional entity of S5.2, core net, will realize that user position information realizes sharing between the different radio Access Network.And will preserve the tabulation of a user's Tracking Area (TA), mobile phone users will be registered on a plurality of TA;
S5.3, under mode of operation, keep a specific TA, when user's paging information arrives, at first in this TA, carry out paging;
S5.4, meanwhile, CPC will keep a clock, the interval that position among the record specific TA is upgraded, if clock time has arrived, and do not have occurrence positions to upgrade, CPC will think that portable terminal has shifted out the zone of present mode of operation, and will carry out paging by other TA of this portable terminal registration, notify it to carry out the position and upgrade.
S5.5, portable terminal also will be opened other mode of operations after finding oneself to shift out existing network automatically, and notice CPC.
It should be noted that at last, above embodiment is only in order to describe technical scheme of the present invention rather than the present technique method is limited, the present invention can extend to other modification, variation, application and embodiment on using, and therefore thinks that all such modifications, variation, application, embodiment are in spirit of the present invention and teachings.
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