CN1910836B - System for packet data service in the mixed network of asynchronous communication network and synchronous communication network and hand-over method thereof - Google Patents

System for packet data service in the mixed network of asynchronous communication network and synchronous communication network and hand-over method thereof Download PDF

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Publication number
CN1910836B
CN1910836B CN2005800020536A CN200580002053A CN1910836B CN 1910836 B CN1910836 B CN 1910836B CN 2005800020536 A CN2005800020536 A CN 2005800020536A CN 200580002053 A CN200580002053 A CN 200580002053A CN 1910836 B CN1910836 B CN 1910836B
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mobile communication
communication terminal
communication system
synchronous
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CN1910836A (en
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金显郁
金永洛
金南健
任种太
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SK Telecom Co Ltd
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SK Telecom Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/92—Protection against other undesired influences or dangers
    • E04B1/94—Protection against other undesired influences or dangers against fire
    • E04B1/941—Building elements specially adapted therefor
    • E04B1/942—Building elements specially adapted therefor slab-shaped
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/92—Protection against other undesired influences or dangers
    • E04B1/94—Protection against other undesired influences or dangers against fire
    • E04B1/946—Protection against smoke or toxic gases
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/26—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups
    • E04C2/284—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating
    • E04C2/296—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating composed of insulating material and non-metallic or unspecified sheet-material

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  • Mobile Radio Communication Systems (AREA)

Abstract

Disclosed herein is a mobile communication terminal and handover method therefor, which enable handover of a mobile communication terminal that is using a packet data service or is in a dormant state in a mobile communication network in which asynchronous and synchronous networks coexist. In the handover method, if a channel is assigned between a mobile communication terminal and a synchronous mobile communication system in response to a request from an asynchronous mobile communication system as a mobile communication terminal using packet data service in the asynchronous mobile communication system moves into an area of the synchronous mobile communication system, call setup is performed. A node B of the asynchronous mobile communication releases a connection to the mobile communication system and assigns a new mobile IP to the mobile communication terminal, thus providing continuous packet data service to the mobile communication terminal.

Description

The system and the changing method thereof that in the hybrid network of asynchronous communication networks and synchronous communication network, are used for packet data service
Invention field
The present invention relates in general to the changing method in a kind of mobile communications network, relate in particular to a kind of mobile communication system and changing method thereof, wherein this system or method can make the mobile communication terminal that is just using packet data service or be in holding state in the mobile communications network of asynchronous and synchronizing network coexistence realize switching.
Technical background
Along with the development of mobile communication technology, in mobile communications network each generation, all changing.Current, the structure of network using be wherein be designed to the second generation or the 2.5th generation network synchronous mobile communication system (code division multiple access (CDMA) mobile communication system) and be designed to the structure of mobile communication system (wideband CDMA (WCDMA) mobile communication system) coexistence of the third generation.
In addition, in order to support the global roaming between a plurality of mobile communication system, developed DBDM (DBDM) mobile communication terminal, this terminal can be used in the synchronous mode system and asynchronous mode system that grows up already.By using this mobile communication terminal, in asynchronous and synchronous mode system realm, just can use dissimilar services.
Current, asynchronous mobile communiation system is structured in the zone with a large amount of service requests, thereby the synchronous mode mobile communication system has developed into the form that its coverage comprises the coverage of asynchronous mode system.Yet, because asynchronous mobile communiation system still is in initial period, and need huge input to realize, thereby can't provide service to vast zone, thus the coverage of asynchronous mobile communiation system can with the mutual crossover in the coverage of synchronous mobile communication system.
Therefore, because the coverage of asynchronous mobile communiation system is restricted, thereby there is a problem, promptly, during the user of asynchronous mobile communiation system uses packet data service in the asynchronous area, if this user moves in the retaining zone that the asynchronous mobile communiation service can not be provided, then this service will be interrupted.
As mentioned above, if the coverage of asynchronous and synchronous mobile communication system coexistence and asynchronous mobile communiation system then needs to switch so that the continuous packet data service between asynchronous and the synchronous mobile communication system to be provided less than the coverage of synchronous mobile communication system.
Summary of the invention
Therefore, at the above problem that occurs in the prior art the present invention has been proposed, an object of the present invention is to provide a kind of mobile communication system and changing method thereof, when the mobile communication terminal of the packet data service of this system and method in using asynchronous network moves to synchronizing network, continuous packet data service is provided, thereby avoids service disruption.
The accompanying drawing summary
Fig. 1 is the view that the configuration of mobile communication system of the present invention has been used in expression;
Fig. 2 and 3 is views that expression is applied to the structure of mobile communication terminal of the present invention;
Fig. 4 A and 4B are in the mobile communications network according to the coexistence of the asynchronous and synchronizing network of the embodiment of the invention, are in the concept map that the mobile communication terminal of holding state switches;
Fig. 5 A and 5B are in the mobile communications network that the asynchronous and synchronizing network according to the embodiment of the invention coexists, the concept map that the mobile communication terminal of use packet data service switches;
Fig. 6 is the flow chart according to the changing method of the mobile communication terminal that is in holding state of the embodiment of the invention;
Fig. 7 is the flow chart according to the changing method of the mobile communication terminal of the use packet data service of the embodiment of the invention;
Fig. 8 and 9 illustrates the example that is applied to according to the protocol stack of mobile communication system of the present invention.
Embodiment
To achieve these goals, the invention provides a kind of in the mobile communications network of asynchronous and synchronous mobile communication system coexistence, the changing method of packet data service is provided to the DBDM mobile communication terminal with asynchronous modem unit and synchronous modem unit, this method may further comprise the steps: first step, when the mobile communication terminal that is in holding state with respect to this asynchronous mobile communiation system moved to synchronous mobile communication terminal regional, the service universal packet wireless business of this asynchronous mobile communiation system (GPRS) support node (the SGSN)/Gateway GPRS Support Node (GGSN) of being engaged in received the information that is used to indicate needs switching; Second step, SGSN/GGSN orders the base station of this synchronous mobile communication system to carry out switching; Third step, this synchronous mobile communication terminal are attempted making a call to the base station, thereby carry out call treatment and channel allocation between the mobile switching centre of this base station and this synchronous mobile communication system; The 4th step is held consultation for call treatment and foundation between this mobile communication terminal and this base station; The 5th step, this synchronous mobile communication system are set up main line (Trunk); The 6th step, the radio link protocol between this mobile communication terminal of initialization and this base station; The 7th step, finish to this synchronous mobile switching centre channel notification distribution this base station; The 8th step, the packet data call of between the packet data serving node of this mobile communication terminal and this synchronous mobile communication system, setting up; And the 9th step, this synchronous mobile communication system distributes mobile IP to this mobile communication terminal.
In addition, the invention provides a kind of being used at mobile communications network asynchronous and the synchronous mobile communication system coexistence, the changing method of packet data service is provided to the DBDM mobile communication terminal with asynchronous modem unit and synchronous modem unit, this changing method may further comprise the steps: first step, be connected to asynchronous mobile communiation system and using this mobile communication terminal of packet data service to move to the zone of this synchronous mobile communication system, and when handover event took place, the Node B of this asynchronous mobile communiation system needed to switch to Serving GPRS Support Node (SGSN)/Gateway GPRS Support Node GGSN notice of this asynchronous mobile communiation system; Second step, this SGSN/GGSN asks the mobile switching centre of this synchronous mobile communication system to carry out switching, and this synchronous mobile switching centre asks the base station of this synchronous mobile communication system to carry out switching then; Third step, this synchronous mobile communication system are carried out being used to send the control signal of grouped data and the assignment procedure of professional (traffic); The 4th step, finish to this mobile switching centre's notice switching this base station, and distribute forward channel to this mobile communication terminal; The 5th step, this mobile switching centre finishes to this SGSN/GGSN notice switching; The 6th step, when this SGSN/GGSN ordered this Node B to carry out switching, this Node B indicated this mobile communication terminal to carry out switching; The 7th step is connected if distributed backward channel and set up between mobile communication terminal and this synchronous mobile communication system, and then this mobile communication terminal switches to this base station notice and finishes; The 8th step, this synchronous mobile communication system is carried out the call setup of packet data service; The 9th step, finish to this synchronous mobile switching centre notice switching this base station, and this mobile switching centre finishes to this SGSN/GGSN notice switching then; The tenth step, this SGSN/GGSN asks this Node B to discharge and being connected of this mobile communication terminal; The 11 step, this packet data serving node of this mobile communication terminal and this synchronous mobile communication system is set up PPP; And the 12 step, distribute mobile IP to this mobile communication terminal.
Below, will be described in detail with reference to the attached drawings embodiments of the invention.
Fig. 1 is the view of expression according to the configuration of mobile communication system of the present invention, therein, provides the element of packet data service to describe this mobile communication system based on being used to.
Being applied to mobile communication terminal 10 of the present invention is DBDM mobile communication terminal (hereinafter referred to as DBDM) mobile communication terminals, and can provide asynchronous mobile communiation service and synchronous mobile communication service for it.This mobile communication terminal optionally is connected to asynchronous mobile communiation system 20 and synchronous mobile communication system 30 with wireless mode, thereby uses the voice-and-data service.To provide the detailed description of this terminal with reference to figure 2 and 3 subsequently.
Asynchronous mobile communiation system 20 comprises: as wireless portion (wireless section) the nodes in communication B 210 of base station with execution and this mobile communication terminal; The radio network controller (RNC) that is used for Control Node B 210; Asynchronous mobile switching centre (MSC) 230, it is connected to RNC 220 and calls out exchange to carry out, thereby provides voice service to mobile communication terminal 10; Serving GPRS Support Node (SGSN) 240, it is placed between RNC 220 and GPRS (GPRS) network 250, with the position of following the trail of mobile communication terminal 10 and carry out access control and safety function, and Gateway GPRS Support Node (GGSN) 260, it is connected to SGSN 240 by GPRS network 250, and is connected to IP network 40 to support carrying out interworking with external packet.In addition, synchronous mobile communication system 30 comprises: base station transceiver station (BTS) 310 is used to support the wireless portion with mobile communication terminal 10 to communicate by letter; Base station controller (BSC) and packeting controller (Packet Control Function: PCF) 320, base station controller (BSC) is used to control BTS 310, this packeting controller is used for carrying out and the similar function of BSC, for example RRM of this packet data service when packet data service is provided; Mobile switching centre (MSC) 330, it is connected to one or more base station controller and calls out exchange to carry out; Packet data serving node (PDSN) 340, it is connected to packeting controller 320 with the PPP(Point-to-Point Protocol) session of foundation with mobile communication terminal 10, be connected with external node, and external agent (FA) function of carrying out the Location Registration that is used for mobile communication terminal 10, thereby provide packet data service to the user; Data core network (DCN) (not shown) is used to support the interface between packet data serving node 340 and the IP network 40; Local (home) agency 350 is used for mobile communication terminal 10 is authenticated and sends grouped data to the external agent, and authentication and authorization charging (AAA) unit 360, is used to this mobile communication terminal to carry out authentication, authorizes and billing function.
Although it is not shown in the drawings, the MSC 230 of asynchronous mobile communiation system 20 and synchronous mobile communication system 30 and 330 interconnects by No. 7 common channel signaling networks, switches or the like required information to send and to receive mobile communication terminal 10 between these two.
In this mobile communication system, mobile communication terminal 10 of the present invention optionally is connected to asynchronous mobile communiation system 20 and synchronous mobile communication system 30, and sends and handle the signal processing state with respect to these two systems.
Fig. 2 is the view of an example that expression is applied to mobile communication terminal of the present invention, and this view shows with asynchronous and synchronizing network and carries out the situation that the functional unit of radio communication is realized independently.
As shown in Figure 2, be applied to DBDM mobile communication terminal 10 of the present invention and comprise antenna 110, asynchronous mobile communiation service module 120, synchronous mobile communication service module 130 and utility module 140.
Antenna 110 can be handled the frequency band of synchronous versus asynchronous mobile communication service simultaneously.
Asynchronous module 120 comprises: duplexer 121, and it is used as band pass filter to handle single frequency respectively; Asynchronous wireless transmission/receiving element 122 is used for the radio wave of transmission/reception is separated to predetermined frequency band; And asynchronous modem unit 123, be used to handle wireless portion agreement with asynchronous mobile communiation system.Synchronization module 130 comprises: duplexer 131, and it is as band pass filter and handle single frequency respectively; Synchronous radio transmission/receiving element 132 is used for transmission/reception radio wave is separated to predetermined frequency band, and synchronous modem unit 133, is used to handle the wireless zone agreement with synchronous mobile communication system.
Utility module 140 comprises: with the application processor of the CPU of doing asynchronous modem unit 123 and synchronous modem unit 133 are controlled, be used to carry out the application processor of multimedia function, memory, I/O unit, and other use processing unit etc.
In addition, in DBDM mobile communication terminal 10, installed and be used for user interface, assistant service, mobile management, connection/session control, the software of resource control and protocol processes, thereby allow the user to use various application services, carry out and switch, and according to the mobile communication system translation-protocol.
In the mobile communication terminal according to present embodiment, the asynchronous modem unit 123 of asynchronous module 120 and the synchronous modem unit 133 of synchronization module 130 can be controlled by utility module 140.In addition, any one can control whole mobile communication terminal in the asynchronous and synchronous modem unit 123 and 133.
Fig. 3 is the view of another example that expression is applied to mobile communication terminal of the present invention, and this view shows with asynchronous and synchronizing network and carries out the situation that the functional unit of radio communication integrates.
As shown in Figure 3, be applied to DBDM mobile communication terminal 10 of the present invention and comprise antenna 150, duplexer 160, multi-band wireless transmission/receiving element 170, multi-mode modulator-demod 180 and some other processing modules 190.
Antenna 150 can be handled the frequency band of synchronous versus asynchronous mobile communication service simultaneously.
Duplexer 160 is as band pass filter, to handle independently from the frequency of asynchronous network and the frequency of coming autosynchronous network.Multi-band wireless transmission/receiving element 170 will send/receive radio wave and be separated to predetermined frequency band.The wireless portion agreement of 180 processing of multi-mode modulator-demod and asynchronous wireless telecommunication system or synchronous mobile communication system.
Processing module 190 comprises the application processor as the CPU of control multi-mode modulator-demod 180, and comprises application processor, memory, the I/O unit of carrying out multimedia function, and other use processing unit etc.
In addition, in DBDM mobile communication terminal 10, installed and be used for user interface, assistant service, mobile management, connection/session control, the software of resource control and protocol processes, thereby allow the user to use various application services, carry out and switch, and according to the mobile communication system translation-protocol.
As mentioned above,, then can realize several advantages, for example reduce the size of mobile communication terminal 10, reduce power consumption and shared modem memory if wireless transmission/receiving element and modulator-demod integrate.
Fig. 4 A and 4B are in the mobile communications network of asynchronous and synchronizing network coexistence, are in the concept map that the mobile communication terminal of holding state switches.
In single mobile communication system, " switching " (perhaps " transfer ") be meant when mobile communication terminal when a sub-district of mobile communication system moves to its another one sub-district, make the technology that the user does not interruptedly communicate.The present invention relates to the changing method of DBDM mobile communication terminal in the network of asynchronous and synchronous mobile communication system coexistence.Move to the situation of asynchronous area A and mobile communication terminal 10 from two kinds of situations that asynchronous area A moves to retaining zone B for mobile communication terminal 10 from retaining zone B, describe second kind of situation in detail.
With reference to figure 4A, the session of the Node B 210 among this mobile communication terminal foundation and the asynchronous area A, be assigned with mobile IP, and enter holding state, under this holding state, this mobile communication terminal is connected to IP network 40 by SGSN 240 and GGSN 260, and if produce data-signal, just can be by the packet data service of using CP server 50 to provide.
When mobile communication terminal 10 passes crossover zone C between asynchronous and retaining zone A and the B when moving to retaining zone B gradually, the Node B 210 of asynchronous mobile communiation system and the transmission/received power between the mobile communication terminal 10 decay gradually.Detected the asynchronous mobile communiation system of this power attenuation, perhaps detected the close synchronous mobile communication system of this mobile communication terminal, needed to switch to the SGSN/GGSN of this asynchronous mobile communiation system 240/260 notice.
Therefore, the BTS 310 of SGSN/GGSN 240/260 command synchronization mobile communication system carries out and switches, thereby carries out call setup and main line foundation between this mobile communication terminal and synchronous mobile communication system.As Fig. 4 B shown in, by PDSN 340 to this mobile communication terminal distribute mobile IP, thereby this mobile communication terminal remain on holding state with respect to synchronous mobile communication system thereafter.
Subsequently, this mobile communication terminal that switches to the synchronous mobile communication system area B discharges and being connected of asynchronous mobile communiation system fully, and remains on holding state in synchronous mobile communication system.After this, if produce data-signal, then this mobile communication terminal is transferred to state of activation, to use packet data service immediately.
Fig. 5 A and 5B are in the mobile communications network of asynchronous and synchronizing network coexistence, the concept map that the mobile communication terminal of use packet data service switches.
With reference to figure 5A, the session of the Node B 210 among this mobile communication terminal foundation and the asynchronous area A, and be assigned with mobile IP.If generation data-signal, then this mobile communication terminal is in holding state, in this holding state, this mobile communication terminal is connected to IP network 40 by SGSN 240 and GGSN 260, and the packet data service that is provided by CP server 50 can be provided, and perhaps this mobile communication terminal is in following state, promptly, this mobile communication terminal is by Node B 210, and SGSN 240 and GGSN 260 are connected to IP network 40, and the packet data service that is provided by CP server 50 is being provided.After this, when mobile communication terminal 10 passes crossover zone C between asynchronous and retaining zone A and the B when the retaining zone B, the Node B 210 of asynchronous mobile communiation system and the transmission/received power between the mobile communication terminal 10 decay gradually.The asynchronous mobile communiation system request synchronous mobile communication system that has detected this power attenuation is carried out switching.Synchronous mobile communication system receives after this handoff request, to mobile communication terminal 10 allocated channels, thereby provides packet data service.
After channel allocation between synchronous mobile communication system and mobile communication terminal 10 had been finished, asynchronous mobile communiation system indicated this mobile communication terminal to carry out switching, thereby this mobile communication terminal is switched to synchronous mobile communication system.When this mobile communication terminal was connected on the synchronous mobile communication system fully, synchronous mobile communication system switches to the asynchronous mobile communiation system notice to be finished.Therefore, Node B 210 releases of asynchronous mobile communiation system and being connected of mobile communication terminal 10.In addition, PDSN by synchronous mobile communication system and HA distribute new mobile IP for this mobile communication terminal, so that this mobile communication terminal uses packet data service continuously.
Subsequently, with reference to figure 5B, this mobile communication terminal that has switched to the synchronous mobile communication system area B discharges and being connected of asynchronous mobile communiation system fully, and can use continuously by CP server 50 by BTS 310, PCF 320, the packet data service that PDSN 340 and IP network 40 provide.
Fig. 6 is the flow chart that is in the method that the mobile communication terminal of holding state switches according to an embodiment of the invention.
When the mobile communication terminal 10 that is in holding state in asynchronous network moves in the synchronizing network zone, the Node B 210 of asynchronous network detects the decay of the transmission/received power between Node B 210 and the mobile communication terminal 10, definite needs switch, and need to switch to SGSN/GGSN 240/260 notice, thereby this mobile communication terminal of indication is leaving asynchronous area (SRNS Serving Radio Network Subsystem (SRNS): need SRNS to reorientate) in step S101.In this case, also send the identification code of mobile communication terminal 10.In addition, the BTS310 that has detected the close synchronous mobile communication system of this mobile communication terminal also can carry out the step S101 that switches to SGSN/GGSN 240/260 notice.
In step S102, the notified SGSN/GGSN 240/260 that needs switching, the BTS 310 of command synchronization network carries out and switches (SRNS reorientates).In addition, in step S103, Node B 210 these mobile communication terminals of indication are carried out and are switched (order is switched according to UTRAN).This Indication message comprises the message relevant with synchronous mobile communication system, and particularly, about channel allocation, Traffic Channel enters the message of (entry) or the like.
After this, in step S104, this mobile communication terminal trial use initiation message (ORM) (ORM[DRS=1]) make a call to BTS 310, thus between BTS 310 and MSC 330, carry out call treatment and channel allocation.Particularly, in step S105, the trial that BTS 310 initiates in response to the calling of this mobile communication terminal sends service request information (connection management: the CM service request) to MSC 330.In step S106, MSC 330 request BTS 310 allocated channels (request for allocation), and BTS 310 is after receiving channel assignment request, in step S107 to this mobile communication terminal channel assignment message (ECAM: extended channel assignment message).
Next, in step S108, between the BTS 310 of this mobile communication terminal (synchronization module) and synchronous mobile communication system, hold consultation (consulting and Connection Service), and carry out main line and set up process about call treatment and foundation.This main line is set up process and can be carried out by the A-interface.Particularly, in step S 109, if BTS 310 request packeting controllers (PCF) 320 set up main line (A9 builds-A8), then in step S110 and step S111, packeting controller 320 request PDSN 340 set up main line and receive about this main line set up the replying of request (A11RRQ, A11RRP).Thereafter, in step S112, the answer signal that packeting controller 320 receives from PDSN 340 to BTS 310 transmissions (the A9 connection-A8).
Adopt this method, when finishing this main line and set up,, between mobile communication terminal 10 and BTS 310, carry out the initialization (RLP initialization) of radio link protocol (RLP) at step S113.At step S114, BTS 310 finishes (having assigned) to the distribution of MSC 330 notification channels.Then,, between this mobile communication terminal and PDSN 340, carry out PPP and set up (PPP sets up), thereby set up new packet data call, carry out mobile IP assigning process then at step S115.
Describe mobile IP assigning process in detail.At step S116, this mobile communication terminal request packeting controller 320 distributes mobile IP (MIP register requirement).Therefore, at step S117,360 pairs of these mobile communication terminals in packeting controller 320 request authentication mandates charging (AAA) unit authenticate (access request).
Therefore, at step S118, the legitimacy of AAA unit 360 these mobile communication terminals of checking, and will verify that the result sends to PDSN 340 (visit is replied).If the legitimate verification that receives from AAA unit 360 determines that but this mobile communication terminal is the receiving terminal, then in step S119 and S120, the mobile IP of PDSN 340 requests local (home) agency 350 distribution also receive and move reply (the MIP RRQ/RRP) of IP request for allocation for this.Adopt this mode,, then the mobile IP that is distributed is sent to this mobile communication terminal (MIP registration reply) at step S121 if distributed mobile IP.
Therefore, this mobile communication terminal discharges and being connected of asynchronous mobile communiation system 20 fully, has distributed new mobile IP by synchronous mobile communication system, and has remained on holding state.
Fig. 7 is the flow chart of the method switched of the mobile communication terminal according to the use packet data service of the embodiment of the invention.
When the mobile communication terminal 10 that is just using packet data service in asynchronous network moves in the synchronizing network, the Node B 210 of asynchronous network is based on the decay of transmission/received power between Node B 210 and the mobile communication terminal 10, definite needs switch, and need to switch (needing SRNS to reorientate) to SGSN/GGSN 240/260 notice at step S201.In this case, also send the identification code of mobile communication terminal 10, at step S202, the MSC 330 of SGSN/GGSN 240/260 request synchronizing network carries out and switches (FACDIR2).
Therefore, MSC 330 request BTS 310 carry out and switch (transferring request), and BTS310 carries out being used to send the control signal and the professional assignment procedure of grouped data in the synchronizing network then.For this operation, in step S204, BTS 310 request packeting controller (PCF) 320 allocated channels (A9-foundation).Therefore, at step S205, packeting controller (PCF) 320 carries out Location Registration to PDSN/FA 340 requests, and receiving position register requirement result (the A11-registration. ask/reply).At step S206, PDSN/FA 340 carries out Location Registration to SGSN/GGSN240/260 request, and receives reply (register requirement/reply) to location registration request, then at step S207 to BTS 310 transmitting channel assignment information (A9-connection).
As mentioned above, when channel allocation is finished, BTS 310 switch to MSC 330 notice at step S208 and finish (transfer request. confirm), and in step S209, by sending an empty frame to this mobile communication terminal, and forward channel is distributed to this mobile communication terminal via the forward fundamental channel (F-FCH) that is used to send forward business (F-FCH frame).
In addition, MSC 330, after notified this switching is finished, finish (facdir2) at step S210 to SGSN/GGSN 240/260 notice switching.In step S211, received the SGSN/GGSN 240/260 command node B210 execution switching (SRNS reorientates order) that notice has been finished in switching.
After this, in step S212, Node B 210 these mobile communication terminals of indication are carried out and are switched (order is switched according to UTRAN).This Indication message comprises the message relevant with synchronous mobile communication system, particularly, and about the message of channel allocation.Received this mobile communication terminal of this switch indicating information, the indication synchronization module is prepared to communicate with synchronous mobile communication system, switch to synchronous mode, and at step S213 via Reverse Fundamental Channel (R-FCH) (R-FCH frame) to the BTS of synchronous mobile communication system 310 transmit frames.Thereafter, at step S214, this mobile communication terminal switches to BTS 310 notices finishes (HCM).Therefore, between mobile communication terminal 10 and this synchronous mobile communication system 30, connect.
Next, BTS 310 carries out the process of calling out of setting up with the packet network of this synchronous mobile communication system.At first, if BTS 310 sets up at step S215 request packeting controller (PCF) 320 and calls out (A-9 connection), at step S216, packeting controller (PCF) 320 carries out Location Registration to PDSN/FA 340 requests, and receives result's (A11-register requirement/reply) of this location registration request.In addition, at step S217, PDSN/FA 340 is to SGSN/GGSN240/260 request carrying out Location Registration, and reception is to reply (register requirement/reply) of this location registration request.
Thereafter, at step S218, packeting controller (PCF) 320 sets up to BTS 310 notification calls and finishes (A-9 connects affirmation).At step S219, BTS 310 finishes (transfer is finished) to MSC 330 notice switchings.At step S220, MSC 330 switches to SGSN/GGSN 240/260 notice and finishes that (transfer is finished, MSONCH).Then, at step S221, SGSN/GGSN 240/260 requesting node B 210 discharges be connected (the Iu release command) with this mobile communication terminal.
Therefore, if the service that offers this mobile communication terminal by asynchronous mobile communiation system 20 is released, then at step S222, the PPP that this mobile communication terminal is carried out with PDSN 340 sets up (PPP foundation), thereby sets up new packet data call.If set up new packet data call, then at step S223, mobile communication terminal request packeting controller (PCF) 320 distributes mobile IP (MIP register requirement).Therefore, at step S224, packeting controller (PCF) 320 request HA 350 distribute mobile IP, and receive reply (MIPRRQ/RRP) to this request, send the mobile IP (MIP registration reply) that is distributed to this mobile communication terminal at step S225 then.
Therefore, this mobile communication terminal discharges and being connected of asynchronous mobile communiation system 20 fully, and the packet data service that is provided by BTS, packeting controller (PCF), PDSN and IP network by the CP server can be provided continuously.
Fig. 8 and 9 is the views that are applied to according to the example of the protocol stack of mobile communication system of the present invention, this view shows the user-plane protocol stack that can be used in following situation, in this case, utility module 140 is built as the DBDM mobile communication terminal in the DBDM mobile communication terminal of control chart 2.
At first, Fig. 8 has described in asynchronous mobile communiation system the situation of PPP as packet data protocol (PDP) type.Can easily realize protocol stack by the interface that makes up between asynchronous mobile communiation system and the local agent 350.
For the protocol stack of communicating by letter with IP network 40, local agent 350 comprises: be used to carry out the L1 layer (physical layer) of coding and modulation, be used to handle and reply sending the L2 layer of message exactly, and the IP layer.In addition, for the protocol stack that is used for communicating by letter with the PDSN 340 of the GGSN 260 of asynchronous network and synchronizing network, local agent 350 comprises the L1 layer, L2 layer and be used to this L2 layer to set up the IP tunnel layer in tunnel (tunnelling).
The GGSN 260 of asynchronous network comprises: the L1 layer, the L2 layer, be used for carrying out User Datagram Protoco (UDP) (UDP)/Internet Protocol (IP) layer of message with IP tunnel (tunnelling) layer that meets local agent 350 in the system that uses IP to send data, be used to define GPRS Tunnel Protocol (the GTP)-U layer of packet data streams and information, and carry out the PPP(Point-to-Point Protocol) layer that packed compressed, authentication, the IP be used for data communication distribute or the like.
In addition, SGSN 240 is connected to GGSN 260 by gn interface, SGSN 240 comprises corresponding to the L1bis layer of L1 layer and the generation, extraction and the exchange that are used to carry out grouped data to meet the ATM(Asynchronous Transfer Mode) layer of L2 layer, thereby the agreement of using among the conversion GGSN 260, and for the data of using in other layers (UDP/IP and the GTP-U) conversion that do not carry on an agreement.
Next, Node B and RNC 210 and 220 are connected to SGSN 240 by the Iu interface, and comprise: corresponding to the L1 layer of L1bis layer, be used to multi-medium data to handle distributing radio resource to meet media interviews controls (MAC) layer of ATM layer, be used for setting up wireless link and merging with this mobile communication terminal and cutting apart grouped data to meet Radio Link control (RLC) layer of this UDP/IP layer, and be used for packet data convergence protocol (PDCP) layer of compressed packet datagram header, thereby the agreement of using among the conversion SGSN 240 to meet the GTP-U agreement.
In addition, the asynchronous modem unit 123 of mobile communication terminal is not carried out the conversion about the L1 layer, and comprise: be used to carry out the link management that link is connected and disconnects, stationary problem solves, flow control and error control or the like, meeting the HDLC framing layer of MAC/RLC/PDCP layer, thereby the agreement of using among the switching node B/RNC also comprises the PPP layer that is used for receiving by the PPP layer of GGSN 260 data.
Simultaneously, PDSN 340 comprises: the L1 layer, the L2 layer, be used for carrying out User Datagram Protoco (UDP) (UDP)/Internet Protocol (IP) layer of message to meet the IP tunnel layer in the system that uses IP to send data, be used to encrypt also generic route encapsulation (GRE) layer of compressed packet, and execution is used for the packed compressed of data communication, authentication, the PPP(Point-to-Point Protocol) layer of IP distribution or the like, thereby the agreement of using in the conversion local agent 350.
Packeting controller (PCF) 320 is connected to PDSN 340 by A-interface (A10), it comprises the L1bis layer corresponding to the L1 layer, and be used to carry out the generation, extraction of grouped data and exchange to meet the ATM layer of L2 layer, thereby the agreement of using among the conversion PDSN 340, and for the conversion that do not carry on an agreement of the data of using in other higher UDP/IP and GRE layer.
In addition, BTS 310 is connected to packeting controller (PCF) 320 by A-interface (A8), it comprises: corresponding to the L1 layer of L1bis layer, be used to multi-medium data to handle distributing radio resource to meet the MAC layer of ATM layer, be used for the request error frame re-transmission avoid occurring at wireless portion wrong meeting the RLP layer of this UDP/IP layer, thereby the agreement of using among the conversion PCF 320.
In addition, the synchronous modem unit 133 of mobile communication terminal is not carried out the protocol conversion for the L1 layer, and comprise: be used to carry out the link management that link is connected and disconnects, stationary problem solves, flow control and error control or the like, meeting the HDLC framing layer of MAC/RLP layer, thus the agreement of using among the conversion BTS/PCF, and comprise the PPP layer that is used for receiving data by the PPP layer of GGSN 260.
At last, the utility module 140 of mobile communication terminal comprises the L1 layer, the PPP layer, and the IP layer, transport layer and application layer, thus conversion is from the agreement of the data of asynchronous modem unit 123 and synchronous modem unit 133 receptions.
In the present embodiment, can see that both only carry out a kind of communication function asynchronous modem unit 123 and synchronous modem unit 133, and utility module is set up the higher PPP layer and the agreement of IP layer.
Next, Fig. 9 shows packet data protocol (PDP)-type i P and is used for the situation of asynchronous mobile communiation system, the figure shows the protocol stack when not using PPP.In this embodiment, can see that different with Fig. 8, because asynchronous mobile communiation system does not use ppp protocol, the PPP layer is not used in GGSN 260, also is different from the asynchronous modem unit 123 of this mobile communication terminal.
In the present invention, execution is set up new PPP and distributed mobile IP to mobile communication terminal in synchronizing network process, with between the operating period of packet data service, support the switching from the asynchronous network to the synchronizing network, thereby provide continuous packet data service to mobile communication terminal.
As mentioned above, those skilled in the art will appreciate that under the situation that does not change technological thought of the present invention or essential feature that the present invention can also realize with other by way of example.Therefore, it is for illustrative purposes that the foregoing description is construed as, and non-limiting purpose and disclosed.Those skilled in the art will appreciate that scope of the present invention is to be limited by claims rather than above detailed description, the various modifications of being derived by the implication of claims and equivalent concepts thereof and scope are added and are replaced and all belong in the scope of the present invention.
Industrial usability
As mentioned above, the present invention allows in the mobile communications network of asynchronous and synchronous mobile communication system coexistence, when the DBDM mobile communication terminal is in holding state, even after this mobile communication terminal switches to synchronous mobile communication system, this mobile communication terminal also remains on holding state, thereby allows this portable terminal to make a response immediately for packet data service. In addition, if using the mobile communication terminal of packet data service to be switched, then new Mobile IP is distributed to this mobile communication terminal, so that continuous service to be provided, thereby improve service quality.

Claims (16)

1. one kind is used at mobile communications network asynchronous and the synchronous mobile communication system coexistence, provide the changing method of packet data service to the DBDM mobile communication terminal with asynchronous modem unit and synchronous modem unit, described method comprises:
First step, when the described mobile communication terminal that is in holding state with respect to described asynchronous mobile communiation system moved to described synchronous mobile communication system regional, the service universal packet wireless business affair GPRS Support Node SGSN/ Gateway GPRS Support Node GGSN of described asynchronous mobile communiation system received the information that is used to indicate needs switching;
Second step, described SGSN/GGSN orders the base station of described synchronous mobile communication system to carry out switching;
Third step, described synchronous mobile communication system are attempted making a call to described base station, thereby carry out call treatment and channel allocation between the mobile switching centre of described base station and described synchronous mobile communication system;
The 4th step is held consultation for call treatment and foundation between described mobile communication terminal and described base station;
The 5th step, described synchronous mobile communication system is set up main line;
The 6th step, the radio link protocol between described mobile communication terminal of initialization and the described base station;
The 7th step, finish to the notification channel distribution of described mobile switching centre described base station;
The 8th step is set up packet data call between the packet data serving node of described mobile communication terminal and described synchronous mobile communication system; And
The 9th step, described synchronous mobile communication system distributes mobile IP to described mobile communication terminal.
2. changing method as claimed in claim 1 wherein in described first step, is needed to switch to described SGSN/GGSN notice by the Node B of described asynchronous mobile communiation system or the described base station of described synchronous mobile communication system.
3. changing method as claimed in claim 1, wherein in described first step, described SGSN/GGSN receives the identification code of described mobile communication terminal.
4. changing method as claimed in claim 1 is comprising comprise that to the message of the switching command of described mobile communication terminal transmission channel allocation information and Traffic Channel enter information by described SGSN/GGSN in described second step.
5. changing method as claimed in claim 1, wherein said third step may further comprise the steps:
Described base station in response is initiated to attempt in the calling of described mobile communication terminal, sends service request information to described mobile switching centre;
Described mobile switching centre asks described base station assigns channel; And
Described base station is to described mobile communication terminal channel assignment message.
6. changing method as claimed in claim 1, wherein said the 5th step may further comprise the steps:
The packeting controller of the described synchronous mobile communication system of described base station requests is set up main line;
The described packet data serving node of described packeting controller request is set up main line, and receives replying described main line foundation request; And
Described packeting controller will send to described base station from the answer signal that described packet data serving node receives.
7. changing method as claimed in claim 1, wherein said the 9th step may further comprise the steps:
When the described packeting controller of the described synchronous mobile communication system of described mobile communication terminal request distributed mobile IP, the authentication and authorization charging AAA unit of the described synchronous mobile communication system of described packeting controller request authenticated described mobile communication terminal;
Described AAA verifies the unit legitimacy of described mobile communication terminal, and sends the legitimate verification result to the described packet data serving node of described synchronous mobile communication system;
If the legitimacy of described mobile communication terminal is proved, the local agent of the described synchronous mobile communication system of then described packet data service node requests distributes mobile IP, and receives replying described request; And
Described packet data serving node sends the described mobile IP that is distributed by described local agent to described mobile communication terminal.
8. one kind is used at mobile communications network asynchronous and the synchronous mobile communication system coexistence, provide the changing method of packet data service to the DBDM mobile communication terminal with asynchronous modem unit and synchronous modem unit, described method comprises:
First step, when being connected to described asynchronous mobile communiation system and use the described mobile communication terminal of described packet data service to move to the zone of described synchronous mobile communication system and handover event takes place, the Node B of described asynchronous mobile communiation system needs to switch to the service universal packet wireless business affair GPRS Support Node SGSN/ of described asynchronous mobile communiation system Gateway GPRS Support Node GGSN notice;
Second step, described SGSN/GGSN asks the mobile switching centre of described synchronous mobile communication system to carry out switching, and described mobile switching centre asks the base station of described synchronous mobile communication system to carry out switching;
Third step, described synchronous mobile communication system are carried out the control signal and professional assignment procedure to being used for packet data transmission;
The 4th step, finish to the notice switching of described mobile switching centre described base station, and distribute forward channel to described mobile communication terminal;
The 5th step, described mobile switching centre finishes to the switching of described SGSN/GGSN notice;
The 6th step, when described SGSN/GGSN ordered described Node B to carry out switching, described Node B indicated described mobile communication terminal to carry out switching;
The 7th step is connected if distributed backward channel and set up between described mobile communication terminal and described synchronous mobile communication system, and then described mobile communication terminal switches to described base station notice to be finished;
The 8th step, described synchronous mobile communication system is carried out the call setup of packet data service;
The 9th step, finish to the notice switching of described mobile switching centre described base station, and described mobile switching centre finishes to the switching of described SGSN/GGSN notice;
The tenth step, described SGSN/GGSN asks described Node B to discharge and being connected of described mobile communication terminal;
The 11 step, the packet data serving node of described mobile communication terminal and described synchronous mobile communication system is set up PPP; And
The 12 step is distributed mobile IP to described mobile communication terminal.
9. changing method as claimed in claim 8, wherein said third step may further comprise the steps:
The packeting controller allocated channel of the described synchronous mobile communication system of described base station requests;
Described packeting controller carries out Location Registration to the described packet data service node requests of described synchronous mobile communication system, and receives the result of described location registration request;
Described packet data serving node is to described SGSN/GGSN request carrying out Location Registration, and reception replying described location registration request; And
Described packeting controller is to described base station transmitting channel assignment information.
10. changing method as claimed in claim 8, the message of indicating comprising the switching that is sent to described mobile communication terminal by described Node B in described the 6th step comprises the information that is used for carrying out channel allocation between described mobile communication terminal and described synchronous mobile communication system.
11. changing method as claimed in claim 8, wherein said the 8th step may further comprise the steps:
The packeting controller of the described synchronous mobile communication system of described base station requests is set up and is called out;
Described packeting controller carries out Location Registration to the described packet data service node requests of described synchronous mobile communication system, and receives the result of described location registration request;
Described packet data serving node is to described SGSN/GGSN request carrying out Location Registration, and reception replying described location registration request; And
Described packeting controller is set up to described base station notification call and is finished.
12. changing method as claimed in claim 8, wherein said the 12 step may further comprise the steps:
The described packet data serving node of described mobile communication terminal request distributes mobile IP;
The local agent of the described synchronous mobile communication system of described packet data service node requests distributes mobile IP, and receives replying described mobile IP request for allocation; And
Described packet data serving node sends the described mobile IP that is distributed by described local agent to described mobile communication terminal.
13. asynchronous mobile communication system that coexists with synchronous mobile communication system, described asynchronous mobile communiation system comprises: as carrying out the Node B as the base station that wireless portion is communicated by letter with the DBDM mobile communication terminal with asynchronous modem unit and synchronous modem unit, radio network controller, service universal packet wireless business affair GPRS Support Node SGSN, and Gateway GPRS Support Node GGSN; Described synchronous mobile communication system comprises: be used to support carry out the base station that wireless portion is communicated by letter with described mobile communication terminal packeting controller, packet data serving node and local agent; Described mobile communication system can be carried out switching when described mobile communication terminal is using packet data service, wherein:
The L1 layer of described local agent by being used to carry out digital coding and modulation, be used for L2 layer that replying of sending of message handled and IP layer and IP network and communicate, and communicate by described L1 layer, described L2 layer and IP tunnel layer and described asynchronous and synchronous mobile communication system
The protocol stack of described GGSN comprises: corresponding to the described L1 layer of described local agent and the L1 layer and the L2 layer of L2 layer, be used to carry out message with User Datagram Protoco (UDP) UDP/ Internet Protocol IP layer corresponding to the described IP tunnel layer of described local agent, be used to define the GPRS Tunnel Protocol GTP-U layer of packet data streams and information, and carry out packed compressed, the authentication be used for data communication, the point-to-point protocol PPP layer that IP distributes
The protocol stack of described SGSN comprises: corresponding to the L1bis layer of the described L1 layer of described GGSN, the generation, extraction and the exchange that are used to carry out grouped data be with the asynchronous transfer mode ATM layer corresponding to described L2 layer, UDP/IP layer and GTP-U layer,
The protocol stack of described Node B/radio network controller comprises: corresponding to the L1 layer of the described L1bis layer of described SGSN, be used to multi-medium data to handle distributing radio resource with media interviews control MAC layer corresponding to described ATM layer, be used for setting up Radio Link with described mobile communication terminal and merging and cut apart grouped data with Radio Link control rlc layer corresponding to described UDP/IP layer, and be used for compressed packet datagram header with packet data convergence protocol PDCP layer corresponding to described GTP-U layer, and
The described asynchronous modem unit of described mobile communication terminal uses the protocol stack that comprises High-Level Data Link Control HDLC framing layer and PPP layer to carry out data communication, wherein, link management, stationary problem solution, flow control and error control that described HDLC framing layer is used to carry out link connection and disconnection are with the described MAC/RLC/PDCP layer corresponding to described Node B/radio network controller, and described PPP layer is used for receiving data by the described PPP layer of described GGSN.
14. mobile communication system as claimed in claim 13, wherein:
The protocol stack that is connected to the described packet data serving node of described local agent comprises: the L1 layer and the L2 layer that correspond respectively to described L1 and L2 layer, be used to carry out message with UDP/IP layer corresponding to described IP tunnel layer, be used to encrypt and the generic route encapsulation GRE layer of compressed packet, and carry out the point-to-point protocol PPP layer that packed compressed, the authentication, the IP that are used for data communication distribute or the like;
The protocol stack of described packeting controller comprises: corresponding to the L1bis layer of the described L1 layer of described packet data serving node, the generation, extraction and the exchange that are used to carry out grouped data are with the asynchronous transfer mode ATM layer corresponding to described L2 layer, UDP/IP layer, and GRE layer
The protocol stack of described base station comprises: corresponding to the L1 layer of the described L1bis layer of described packeting controller, be used to multi-medium data to handle distributing radio resource with media interviews control MAC layer corresponding to described ATM layer, and be used for the request error frame re-transmission and avoid occurring wrong with radio link protocol RLP layer corresponding to described UDP/IP layer at wireless portion, and the described synchronous modem unit use of described mobile communication terminal comprises the L1 layer, the protocol stack of High-Level Data Link Control HDLC framing layer and PPP layer is carried out data communication, wherein, described HDLC framing layer is used to carry out the link management that link connects and disconnects, stationary problem solves, flow control and error control are with corresponding to described MAC/RLP layer, and described PPP layer is used for receiving data by the described PPP layer of described GGSN, and
The utility module of described mobile communication terminal is carried out data communication by L1 layer, PPP layer, IP layer, transport layer and application layer, thereby conversion is from the agreement of the data of described asynchronous modem unit and the reception of described synchronous modem unit.
15. asynchronous mobile communication system that coexists with synchronous mobile communication system, described asynchronous mobile communiation system comprises: as carrying out the Node B as the base station that wireless portion is communicated by letter with the DBDM mobile communication terminal with asynchronous modem unit and synchronous modem unit, radio network controller, service universal packet wireless business affair GPRS Support Node SGSN, and Gateway GPRS Support Node GGSN; Described synchronous mobile communication system comprises: be used to support carry out the base station that wireless portion is communicated by letter with described mobile communication terminal packeting controller, packet data serving node and local agent; Described mobile communication system can be carried out switching when described mobile communication terminal is using packet data service, wherein:
The L1 layer of described local agent by being used to carry out digital coding and modulation, be used for L2 layer that replying of sending of message handled and IP layer and IP network and communicate, and communicate by described L1 layer, described L2 layer and IP tunnel layer and described asynchronous and synchronous mobile communication system
The protocol stack of described GGSN comprises: corresponding to the described L1 layer of described local agent and the L1 layer and the L2 layer of L2 layer, be used to carry out message with User Datagram Protoco (UDP) UDP/ Internet Protocol IP layer corresponding to the described IP tunnel layer of described local agent, and the GPRS Tunnel Protocol GTP-U layer that is used to define packet data streams and information;
The protocol stack of described SGSN comprises: corresponding to the L1bis layer of the described L1 layer of described GGSN, the generation, extraction and the exchange that are used to carry out grouped data be with the asynchronous transfer mode ATM layer corresponding to described L2 layer, UDP/IP layer and GTP-U layer,
The protocol stack of described Node B/radio network controller comprises: corresponding to the L1 layer of the described L1bis layer of described SGSN, be used to multi-medium data to handle distributing radio resource with media interviews control MAC layer corresponding to described ATM layer, be used for setting up Radio Link with described mobile communication terminal and merging and cut apart grouped data with Radio Link control rlc layer corresponding to described UDP/IP layer, and be used for compressed packet datagram header with packet data convergence protocol PDCP layer corresponding to described GTP-U layer, and
The described asynchronous modem unit of described mobile communication terminal uses the protocol stack that comprises High-Level Data Link Control HDLC framing layer to carry out data communication, wherein, described HDLC framing layer is used to carry out link management, stationary problem solution, flow control and the error control of link connection and disconnection with the described MAC/RLC/PDCP layer corresponding to described Node B/radio network controller.
16. mobile communication system as claimed in claim 15, wherein:
The protocol stack that is connected to the described packet data serving node of described local agent comprises: the L1 layer and the L2 layer that correspond respectively to described L1 and L2 layer, be used to carry out message with UDP/IP layer corresponding to described IP tunnel layer, be used to encrypt the also generic route encapsulation GRE layer of compressed packet, and the point-to-point protocol PPP layer of carrying out that packed compressed, authentication, the IP be used for data communication distribute etc.
The protocol stack of described packeting controller comprises: corresponding to the L1bis layer of the described L1 layer of described packet data serving node, the generation, extraction and the exchange that are used to carry out grouped data are with the asynchronous transfer mode ATM layer corresponding to described L2 layer, UDP/IP layer, and GRE layer
The protocol stack of described base station comprises: corresponding to the L1 layer of the described L1bis layer of described packeting controller, be used to multi-medium data to handle distributing radio resource with media interviews control MAC layer corresponding to described ATM layer, and be used for the request error frame re-transmission and avoid occurring wrong with radio link protocol RLP layer corresponding to described UDP/IP layer at wireless portion, and the described synchronous modem unit use of described mobile communication terminal comprises the L1 layer, the protocol stack of High-Level Data Link Control HDLC framing layer and PPP layer is carried out data communication, wherein, described HDLC framing layer is used to carry out the link management that link connects and disconnects, stationary problem solves, flow control and error control are with corresponding to described MAC/RLP layer, and described PPP layer is used for receiving data by the described PPP layer of described GGSN, and
The utility module of described mobile communication terminal is carried out data communication by L1 layer, PPP layer, IP layer, transport layer and application layer, thereby conversion is from the agreement of the data of described asynchronous modem unit and the reception of described synchronous modem unit.
CN2005800020536A 2004-01-08 2005-01-07 System for packet data service in the mixed network of asynchronous communication network and synchronous communication network and hand-over method thereof Expired - Fee Related CN1910836B (en)

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