CN1887020A - Inter-system handoff between wireless communication networks of different radio access technologies - Google Patents

Abstract

Various schemes for performing inter-system handoff, e.g., from a UTRAN to a cdma2000 radio access network (RAN) are described. For a MAHHO scheme, the UTRAN uses measurements obtained by a multi-RAT device to determine suitable cdma2000 cell(s) for handover. The measurements are obtained by a candidate frequency search procedure, and the handover is accomplished by a handoff execution procedure. For a MDHHO scheme, the UTRAN relies on location information for the multi-RAT device to select suitable cdma2000 cell(s) for handover. For a CRHHO scheme, a new call is established on the cdma2000 RAN and the pending call on the UTRAN is released in a manner such that the handover appears seamless to the multi-RAT device. The multi-RAT device includes two modem processors that perform processing for the UTRAN and cdma2000 RAN and an application processor that controls the modem processors.

Description

Inter-system handoff between the cordless communication network of different radio access technologies

The related application cross reference

The application's case advocates that on October 2nd, 2003 filed an application and name is called the right of the 60/508th, No. 452 interim U. S. application case of " handoff procedures (Inter-System Handoff Procedures) is asked by system ".

Technical field

The present invention relates to communication by and large, and more specifically relate to be used to make wireless device at two for carrying out the technology of inter-system handoff between the cordless communication network of different radio access technologies.

Background technology

Wireless communication system is widely used in to be provided such as various communication services such as speech, grouped datas.These systems can be and can support a plurality of users' multiple access system by sharing free system resources.The example of this kind multiple access system comprises code division multiple access (CDMA) system, time division multiple access (TDMA) system, reaches frequency division multiple access (FDMA) system.Cdma system can be carried out for example radio access technologies (RAT) such as wideband CDMA (W-CDMA), cdma2000.RAT is meant the technology that is used for radio communication.Tdma system can be carried out for example global system for mobile communications RAT such as (GSM).W-CDMA and GSM are set forth in from one and are called in one group of file of " third generation partnership projects " association (3GPP).Cdma2000 is set forth in from one and is called in one group of file of " third generation partnership projects 2 " association (3GPP2).3GPP and 3GPP2 file can openly obtain.

W-CDMA and cdma2000 are the third generation (3G) RAT, and it can provide enhanced service and ability (for example higher data transmission rate, parallel speech and data call, or the like).W-CDMA and cdma2000 utilize different signal processing and control.Therefore, if carry out, cdma system is carried out W-CDMA or cdma2000.

One wireless many RAT device (for example dual-mode cellular telephone) can have and W-CDMA and the two ability that communicates of cdma2000.This can make user serve the coverage that also can enlarge same device from W-CDMA and the two acquisition of cdma2000 thus.For example, many RAT device can be at first set up with a W-CDMA system and is communicated by letter and after this move out the area of coverage of this W-CDMA system and enter the area of coverage of a cdma2000.In this kind situation, with hope with a kind of make mode that unsettled communication minimally interrupts should many RAT device from W-CDMA system handover (or transfer) to cdma2000.Regrettably, 3GPP and 3GPP2 do not set forth the clause that is used to implement the handover to cdma2000 from the W-CDMA system at present as yet.

Therefore, need to be provided for technology in the affiliated field to handover between many RAT device implementation system (for example from the W-CDMA system to cdma2000).

Summary of the invention

Setting forth herein is used to use various schemes to come the technology of handover between implementation system.These schemes comprise one to measure auxiliary hard handoff switching (MAHHO) scheme, to measure directed hard handoff switching (MDHHO) scheme and call re-establishment hard handoff switching (CRHHO) scheme.Can implement these schemes to many RAT device: (1) one first modem processor with (for example) following apparatus, it is that one first (" just serving ") wireless network (current just having a unsettled calling of carrying out with it) is implemented to handle, (2) one the 22 modem processors, it will be implemented to handle to described device by handover one second (" target ") wireless network extremely, and (3) one application processors, it controls described first and second modem processor.Described first and second wireless network can be respectively (for example) UMTS (Universal Mobile Telecommunications System) terrestrial radio access network (UTRAN) and a cdma2000 radio access network (RAN).

For described MAHHO scheme, described UTRAN uses the measured value that is obtained by described many RAT device to determine to be suitable for the cdma2000 sub-district that described device is handed over to.Obtain described measured value by implementing an alternative frequency search program, and finish handover by implementing a handover executive program.For described MDHHO scheme, described UTRAN relies on the positional information of described many RAT device to select the cdma sub-district that is suitable for handing to most.For described CRHHO scheme, newly call out and discharge unsettled calling on the described positive service radio network setting up one on the described target radio network.Can be by the described new calling of starting or terminate of described many RAT device.Also can implement described call setup and call out to discharge to make described handover be seamless and the communication minimally is interrupted at described many RAT device.Hereinafter will set forth the exemplary signal flow of all three kinds of inter-system handoff schemes.

In an embodiment of described CRHHO scheme, described first modem processor is implemented to handle to a unsettled calling of carrying out with described first wireless network (for example UTRAN), receive one first message (a for example Handover from UTRAN Command (from the UTRAN handover command)) with the handover of enforcement from described first wireless network, and the notice of described handover is provided to described second wireless network (a for example cdma2000 RAN).Described application processor receives described notice and instructs described second modem processor and described second wireless network to set up a calling newly from described first modem processor.In response to this, set up one's own business affair channel and implement to handle for described new calling of described second demodulator processes device and described second establishing wireless network.Described first wireless network discharges described unsettled calling and described application processor switches to described second wireless network (for example switching to the cdma2000 vocoder from UTRAN) with data path from described first wireless network.

Each side of the present invention and embodiment also will further elaborate hereinafter.

Description of drawings

Read detailed description mentioned above in conjunction with the accompanying drawings, with easier feature of the present invention and the character learnt, in institute's drawings attached, identical reference symbol is all represented identical implication, in the accompanying drawing:

Fig. 1 shows that one comprises the deployment of a UTRAN and a cdma200 RAN;

Fig. 2 shows that one has many RAT device of two modem processors;

Fig. 3 shows another view of described many RAT device;

Fig. 4 A and 4B show two programs that are used for the ability of many RAT device is sent to UTRAN;

Fig. 5 shows layer 3 treatment state of IS-2000;

Fig. 6 shows the alternative frequency search program of MAHHO;

Fig. 7 shows the handover executive program of MAHHO;

Fig. 8 shows that one does not have the MAHHO program of first preamble information;

Fig. 9 shows that one has the MAHHO program of first preamble information;

Figure 10 A and the 10B demonstration one CRHHO program under (MT) call re-establishment situation that terminates by mobile device; And

Figure 11 A and 11B show one in the CRHHO program of being initiated by mobile device under (MO) call re-establishment situation.

Embodiment

In this article, " exemplary " speech is used to mean " separating as an example, example or example ".In this article, the embodiment of any being called " exemplary " or design all may not be considered as than other embodiment or be designed to good or favourable.

The inter-system handoff technology of being set forth herein can be used for various wireless communication systems and network.Network typically refers to a system deployment, though these two terms often can be general.Handover and handover (its for also can be general term) be meant a wireless device are shifted or be handed over to another network controller from a network controller.For the purpose of clear, specifically set forth these technology at be handed off to a cdma2000 RAN from a UTRAN.In the explanation, UMTS is meant the described technology by 3GPP from kind hereinafter, and cdma2000 is meant the described technology by 3GPP2 from kind.

Fig. 1 shows that one comprises the deployment of a UTRAN 110 and a cdma2000 RAN 120.UTRAN 110 can support the W-CDMA of Frequency Division Duplexing (FDD) (FDD) pattern and/or the GSM of time division duplex (TDD) pattern.The W-CDMA standard is the part relevant with W-CDMA in the 3GPP explanation.

UTRAN 110 comprises: (1) Node B 112, and it provides communication for the wireless device in the UTRAN area of coverage, and (2) one radio network controllers (RNC) 114, and it is coordinated and control for Node B provides.RNC 114 further is situated between and connects a core network (CN), and this core network (CN) is implemented switching and routing and Network Management Function is provided customer service.This core network comprises for example entities of various kinds such as UMTS mobile switching centre (MSC) 116.UMTS MSC 116 provides circuit switched communication (for example, for voice call) and further supports that GSM MAP (GSM-MAP)-it is one can realize roaming and the mobile network protocol of high-level service.

Similarly, cdma2000 RAN 120 comprises: (1) base station transceiver system (BTS) 122, and it provides communication and (2) one base station controllers (BSC) 124 for the wireless device in the overlay area that is in cdma2000RAN, and it is coordinated and control for BTS provides.Cdma2000 RAN 120 can carry out IS-2000, IS-856, IS-95 and/or other are based on the standard by file that 3GPP2 issues.BSC 124 further Jie for example connect, and IS-41 MSC 126 waits other network entities.IS-41 MSC 126 provides circuit switched communication and further supports ANSI-41-that it can realize roaming and the mobile network protocol of high-level service for another kind of.IS-41 MSC 126 provides the network savvy (IWF) 130 of interface to communicate with UMTS MSC 116 between UTRAN and cdma2000 RAN by one.IWF 130 can carry out the IS-41 handover applying portion (HAP) as the expansion of GSM-MAP.

Node B and BTS are respectively the base station among UTRAN and the cdma2000 RAN.Each base station is a specific geographical area provides communication to cover.Decide according to the context that uses this term, usually base station and/or its overlay area are called " sub-district ".

One wireless many RAT device 150 (a for example bimodulus cell phone) has the ability of communicating by letter with UTRAN 110 and cdma2000RAN 120.This kind ability makes user obtain service from these two networks by same device.Many RAT device 150 both can be and fixing also can be mobile and be called subscriber equipment (UE) in the 3GPP term, be called travelling carriage (MS) in the 3GPP2 term.Many RAT device 150 can arbitrary given time on down link and/or up link with one or more base station communications.Down link (or forward link) is meant from the base station the extremely communication link of device, and up link (or reverse link) is meant the communication link to the base station from device.

Fig. 2 shows an embodiment of many RAT device 150, and many RAT device 150 comprises two modem processor 210a and 210b.As described in 3GPP TS 25-321, TS 25-308, TS 25-212 and other 3GPP files, modem processor 210a implements to handle to down link and the ul transmissions of UMTS.As being called described in the 3GPP2C.S0002-C of " the physical layer standard of cdma2000 spread spectrum system; version C (Physical Layer Standard forcdma2000Spread Spectrum Systems; Release C) " in the name that can openly obtain, modem processor 210b implements to handle to down link and ul transmissions based on wherein a kind of CDMA standard (for example IS-2000) of 3GPP2 file.In this article, modem processor 210a and 210b also are called UMTS travelling carriage modulator-demodulator (UMTS MSM) and cdma2000 MSM respectively.

In modem processor 210a, the signaling of the up link of UMTS and data are handled (for example format, encode and interlock) and are further handled (for example channelizing/expansion, scramble and modulation) by a modulator (MOD) 214a by emission (TX) data processor 212a, to obtain a stream of data chips.Then, transmitter unit (TMTR) 232a regulates (for example being transformed into analog form, amplification, filtering and up-conversion) this stream of chips to produce a uplink signal.This uplink signal is by duplexer/duplexer 234 routings and be emitted to Node B 112 among the UTRAN by an antenna 236 in the same way.

On the down link of UMTS, receive by antenna 236 from the down link signal of Node B among the UTRAN 112, by 234 routings of homodromy/duplexer and provide to a receiving element (RCVR) 238a.Receiving element 238a regulates (for example filtering, amplification, and down-conversion) received signal and will be signal digitalized to obtain sample through what regulate.In modem processor 210a, a demodulator (DEMOD) 216a receives and handles (for example descrambling, channelizing/de-spread, and demodulation) these samples to obtain symbol.Known in the affiliated field, demodulator 216a can make up the rake receiver that can handle a plurality of signal examples in the received signal (or multipath assembly).Then, one receives (RX) data processor 218a handles (for example release of an interleave and decoding) these symbols, checks the data block that is received and data through decoding are provided.

For the embodiment shown in Fig. 2, modem processor 210a and 210b can implement separately to handle to UTRAN and cdma2000 RAN respectively.For example, each modem processor 210 all can be to its network implementation coding and decoding.Modem processor 220a and 220b control the processing unit in modem processor 210a and the 210b respectively, and further keep protocol stack and the state of UMTS and cdma2000 respectively.The structure form of this duplex MODEM processor design can the simplification many RAT device is because (1) can make up modem processor 210a and (2) can make up modem processor 210b by a modem processor (need not equally to change or change very little) that is used for single mode cdma2000 device by a modem processor (hardware and software need not to change or change very little) that is used for single mode UMTS device.

Can come the duplex MODEM design shown in the design of graphics 2 by different modes.For example, each modem processor 210 can be implemented in one or more application specific integrated circuits (ASIC).Application processor 240 can be implemented in the independent integrated circuit (IC) or incorporate in the ASIC of one of them modem processor.Similarly, master controller 250 can be implemented in the independent IC or incorporate in the ASIC of a modulator-demodulator.As another example, these two modem processor 210a and 210b, application processor 240 and master controller 250 can be implemented in the single ASIC.

Fig. 2 also shows transmitter unit 222a alone and 222b and alone receiving element 238a and the 238b of UMTS and cdma2000.This transceiver design makes many RAT device can use emission/RX path alone to communicate by letter with UTRAN and cdma2000 RAN simultaneously.These two wireless networks also can be shared transmitter and receiver circuit.For example, if these signals are on two different frequency bands and power amplifier is a wide-band amplifier, then single power amplifier just may amplify the two uplink signal of UMTS and cdma2000.

The upper layer application (for example for speech and grouped data) of one application processor, 240 control modem processor 210a and the operation of 210b and the service that support needs these modem processors.The operation of various processing units in one master controller, 250 many RAT of control devices.Memory 242 and 252 is stored respectively by controller 240 and 250 employed data and codes.

Fig. 3 shows another view of many RAT device 150 from an application point.UMTS MSM 210a and cdma2000 MSM 210b implement separately to handle to UTRAN and cdma2000 RAN respectively.Application processor 240 sends ' order ' and instructs the operation of UMTS MSM and cdma2000 MSM and from ' incident ' of these MSM reception information/situations.

UTRAN can make UTRAN know the dual-mode capabilities of many RAT device, so that can distinguish many RAT device and single mode (for example only UMTS) wireless device.For making things convenient for the inter-system handoff between UTRAN and the cdma2000 RAN, need carry out this kind differentiation.Hereinafter will set forth several technology that are used for device capability is sent to UTRAN.

Fig. 4 A shows that one is used to many RAT device to connect (or calling) and the radio resource control (RRC) that device capability is sent to UTRAN is connected the program of finishing of setting up.RRC is the part of the layer 3 in the UMTS protocol stack, and it provides information transfer service to a Non-Access Stratum (NAS), and the configuration of the layer 1 and 2 in the control protocol storehouse.NAS is a functional layer, its support wireless device with and the core network that connects of UTRAN Jie between business and signaling message.

Many RAT device (or more particularly being UMTS MSM) starts RRC by transmission one RRC Connection Request (RRC connection request) message and connects the program (step 412) of finishing of setting up.This message comprises sets " setting up reason (Establishment the Cause) " value of calling out of initiating or terminate for.Then, UTRAN sends a RRC with relevant information and connects and set up message and set up calling (step 414).This message comprises one " ability update requires (Capability Update Requirement) " information word (IE), and this information word has " the more new demand of system's certain capabilities (System Specific Capability UpdateRequirement) " field of setting (for example) ' IS-2000 ' for.The version 99 of the 3GPP TS 25-331 single listed item (or value) ' GSM ' that has been " the more new demand of system's certain capabilities " fields specify.Can be the new listed item ' IS-2000 ' of this fields specify one.

Many RAT device connects according to RRC to be set up information included in the message and implements to connect and set up.After finishing foundation, many RAT device just sends a RRC connection setup complete message (step 416) to UTRAN.This message comprises " radio access capability between RATUE (Inter-RATUE Radio Access Capability) " information word that is packaged with a plurality of cdma2000 (for example IS-2000) message.For example, this information word can comprise three examples of an IS-2000 status message (StatusMessage), and each message instance all comprises a different information record.Can send different relevant informations to UTRAN, for example (for example) device information (for example time slot loop index (SLOT_CYCLE_INDEX), the grade mark of standing, mobile device make code, and model), 15 international mobile subscriber identity (IMSI) code that is used for the country of origin of recognition device and network, and the Electronic Serial Number (ESN) of device.ESN one embeds or is engraved in unique identifier on the device microchip by manufacturer, and it is used for demo plant and false proof.

Fig. 4 B shows that one is used for independently sending to UTRAN the program of its ability by many RAT device.After successfully setting up RRC connection, UMTS MSM independently sends a UE ability information (UE Capability Information) message (step 452).As mentioned above, this message comprises " radio access capability between RATUE " information word, and this information word is packaged with a plurality of cdma2000 message with different relevant informations.UTRAN confirms that with a UE ability information (UECapability Information Confirm) message makes answer, to confirm to receive the message (step 454) that many RAT device is sent.Message and the information word of UMTS in 3GPP TS 25-331, have been set forth.

As mentioned above, UMTS MSM and cdma2000 MSM maintain the protocol stack of UTRAN and cdma2000 RAN respectively.UMTS MSM and cdma2000 MSM also maintain other functions (calling out control) of state machine and each automatic network thereof of layer 3.For the purpose of clear, hereinafter will set forth the state machine of the layer 3 of IS-2000.

Fig. 5 shows a state diagram 500 of layer 3 treatment state of IS-2000.After powering up, cdma2000 MSM is converted into a travelling carriage init state 510.Cdma2000 MSM remains in state 510 at one's leisure, and cdma2000 RAN is obtained after from the appropriate command of application processor receiving one.After obtaining the cdma2000 timing, cdma2000 MSM is converted into a travelling carriage idle condition 520.In state 520, cdma2000 MSM can receive or initiate a calling, implements registration, receives or start a transmission of messages, reach and implement other operations.Usually, after any one operation in starting these operations, cdma2000 MSM is converted into a system and inserts (SystemAccess) state 530 to insert cdma2000 RAN.In state 530, cdma2000 MSM on forward and reverse shared channel with cdma2000 RAN exchange of signaling and be directed to a Dedicated Traffic Channel.Be in active state if an IS-2000 calls out, then cdma2000 MSM proceeds to a travelling carriage from state 530 and Traffic Channel is implemented the state 540 of control (Mobile Station Control on the Traffic Channel) and communicates with cdma2000RAN in state 540.After terminated call, cdma2000 MSM just is back to state 510.

Fig. 5 also shows the sub-state of travelling carriage to the state 540 of Traffic Channel enforcement control.In the sub-state 542 of a traffic channel initialization (Traffic Channel), cdma2000 MSM verifies that it can receive a forward traffic channel and begin and transmits on a reverse traffic channel.In the sub-state 544 of a Traffic Channel (Traffic Channel), cdma2000MSM comes and cdma2000 RAN swap data according to a service configuration.Discharge in (Release) sub-state 546 one, cdma2000 MSM disconnects the IS-2000 calling and discharges Traffic Channel.

The call control state machine 550 that is used to carry out voice call that the further demonstration one of Fig. 5 is kept by cdma2000 MSM.Wait in the sub-state 552 of order (Waiting for Order) that one cdma2000 MSM waits for how an indication from cdma2000 RAN reaches the message that when makes this phone ringing.Reply in (Waitingfor Mobile Station Answer) sub-state 554 at a wait travelling carriage, cdma2000 MSM waits for that the user responds to this calling.Cdma2000 MSM is converted into conversation (Conversation) sub-state 556 and the Traffic Channel by institute's assignment, communicates by letter with cdma2000 RAN according to service configuration after receiving user response.Cdma2000 MSM is converted into one and calls out (Call Release) the sub-state 588 of release after the order that receives a call release from user or cdma RAN, and confirm to call out to disconnect, and be back to travelling carriage init state 510.

Be called the state and the sub-state of having set forth IS-2000 among the 3GPP2C.S0005-C of " upper strata of cdma2000 spread spectrum system (layer 3) signaling standard; version C (UpperLayer (Layer 3) Signaling Standard for cdma2000Spread Spectrum Systems, Release C) " in name.3GPP has described the state diagram that UMTS calls out equally in 3GPP TS 25-331.

As shown in fig. 1, many RAT device can be mobile and can move everywhere in the overlay area of UTRAN and cdma2000 RAN.Many RAT device can be communicated by letter with a network (for example UTRAN) and removablely be gone out the overlay area of this network and enter in the overlay area of another network (for example cdma2000 RAN).When this kind situation takes place, need (for example having better signal quality) objective network that many RAT device is more suitable for from the network handover to of just serving.

Set forth herein several with many RAT device from the UTRAN handover inter-system handoff scheme to cdma2000 RAN.These handoff scheme comprise: (1) switches (MAHHO) scheme to measure auxiliary hard handoff, and (2) switch (MDHHO) scheme to measure directed hard handoff, and (3) call re-establishment hard handoff switches (CRHHO) scheme.Can be according to implementing these schemes at this duplex MODEM processor shown in many RAT device among Fig. 2.Hereinafter also can be used as the flow chart of the program that will implement by many RAT device and network entity at the described signal flow of inter-system handoff scheme.

A. switch (MAHHO) to measure auxiliary hard handoff

MAHHO is a kind of inter-system handoff technology, and wherein UTRAN uses the measured value that is obtained by many RAT device to determine the suitable cdma2000 sub-district that device is handed over to.For example, UTRAN can use MAHHO to trigger the Target cell that many RAT device handover has been measured and reported when its signal quality has been in talking state by described device on positive service network.MAHHO has increased the probability of success of handover, especially when the base station of cell-of-origin and Target cell is not co-located on same place.Can be by two alternative frequency search programs of program-one and a handover executive program-implement MAHHO.

Fig. 6 shows the alternative frequency search program 600 of the exemplary of MAHHO.When many RAT device was in the overlay area of UMTS sub-district, a border (its be arranged in the sub-district of the boundary of UTRAN), UTRAN made device periodically or according to incident report cdma2000 measured value.This is to realize (step 612) by send one to device from UTRAN handoff command (Handover from UTRAN Command).This order comprises and is packaged with the alternative frequency search request message of (for example) IS-2000 (Candidate Frequency Search RequestMessage, " system message between RAT (Inter-RAT System Message) " information word CFSRM).CFSRM carries search configuration (for example alternative frequency search tabulation, it is to be used to search for the list of frequency of cdma2000 sub-district) and reporting standards information (for example stipulating to report those measured values and will report this kind measured value under which kind of condition to UTRAN).UTRAN can determine alternative frequency search tabulation according to the cdma2000 sub-district of UMTS sub-district, known covering border in advance.

UMTS MSM is received from the UTRAN handover command from UTRAN, extracts CFSRM from the order that is received, and with the forwards extracted to application processor (step 614).Then, application processor starts or opens cdma2000 MSM and provide search command and information (step 616) from CFSRM for it.

Cdma2000 MSM opens cdma2000 receiver (the receiving element 238b among Fig. 2) and waits for that scheduled time amount is so that receiver circuit preheating (square 620).After the cdma2000 receiver was finished preheating, cdma2000 MSM began that each target frequency in the alternative frequency search tabulation is implemented pilot signal and obtains (square 622).One pilot signal is all launched in each UMTS and cdma2000 sub-district, and this pilot signal can be by the wireless device process in its overlay area, to obtain system's timing, frequency and other information of this sub-district.If find a cdma2000 pilot signal (its may be not in the frequency in the tabulation of alternative frequency search), then cdma2000 MSM obtain and launch this pilot signal the cdma2000 sub-district synchronously and adjust its timing (square 624) to this sub-district.Can implement to obtain synchronously according to a synchronization message that is sent by the cdma2000 sub-district.Cdma2000 MSM does not need to obtain from the cdma2000 sub-district system information and does not register in cdma2000 RAN.Then, cdma2000 MSM implements alternative frequency search and search report result (square 626) according to the standard that is sent in CFSRM.

Because many RAT device has been set up with UTRAN and has been connected, so cdma2000 MSM connects the transmission Search Results by this.Cdma2000 MSM is sent to UMTS MSM (step 632) by application processor with Search Results.Cdma2000 MSM keeps active state and whenever the measured value report just is forced to off-line when being deactivated when measured value report is in active state.Then, UMTS MSM sends measurement report (Measurement Report) message (step 634) that comprises from the Search Results of cdma2000 MSM.3GPP is not given for the extend type that carries from the measurement report message of the Search Results of cdma2000 MSM in TS 25-331 version 99.

UTRAN obtains Search Results and determines whether the cdma2000 sub-district that exists a positive Serving cell than UMTS to have better quality from many RAT device.If satisfy handoff condition according to determining from the measurement report of many RAT device, then UTRAN starts the handover executive program so that many RAT device is handed off to a better cdma2000 sub-district from the positive Serving cell of UMTS.

Fig. 7 shows the exemplary handover executive program 700 of MAHHO.UTRAN is by it is just handled UMTS MSC one that unsettled UMTS calls out for many RAT device and send one and reorientate required (Relocation Required) message and start handover (step 712) for current to " source " UMTSMSC-.This message makes the UTRANRNC-that just serving, and it has RNC or the BSC that RNC-that a signaling is connected can ask many RAT device is repositioned to another RAN for current and many RAT device.This message carries the information of relevant following content: identity, ability and the position of (1) many RAT device (it can obtain by one of them the capability report program described in Fig. 4 A and the 4B) and (2) alternative frequency search result (it can obtain by alternative frequency search program shown in Figure 6).Source UMTS MSC reorientates required forwards to IWF with this, and IWF becomes this message conversion one facility instruction 2 (FACDIR2) message and this new information is sent to a target IS-41 MSC (step 714).Target IS-41 MSC for many RAT device the MSC that will be situated between mutually and connect by handover cdma2000 RAN extremely.

Target IS-41 MSC receives FACDIR2 message, and in response to this hand-off request (HandoffRequest) message is sent to the cdma2000 BSC of cdma2000 Target cell, switches (step 722) with the hard handoff that starts many RAT device.Then, cdma2000 RAN confirms that with a hand-off request (Ack) (Handoff RequestAcknowledgement) message is sent to target IS-41 MSC (step 724) and upward signaling is sent to many RAT device (step 726) at forward primary channel (F-FCH).Target IS-41 MSC also is sent to source UMTS MSC (step 732) by IWF with a facdir2 message.Then, UMTS MSC in source reorientates order (RelocationCommand) with one and is sent to UTRAN (step 734).This message comprises usually in IS-2000 expansion (or general) hand-off direction message (Extended (or Universal) Handoff Direction Message, the information that carries for the cdma2000 Target cell of wanting handover in EHDM).Then, UTRAN is sent to many RAT device to instruct this device to implement handover (step 742) with one from the UTRAN handover command.This order comprises " system message between RAT " information word, and this information word is packaged with EHDM, and EHDM comprises the information of cdma2000 Target cell again.

UMTS MSM receives and should extract EHDM from the order that is received, and the EHDM that is extracted is forwarded to application processor (step 744) from the UTRAN handoff command.Then, application processor starts cdma2000MSM and gives one handoff command (step 746).Then, cdma2000 MSM enters the sub-state of a traffic channel initialization and thinks that the down link of cdma Target cell and up link set up Traffic Channel and make its (square 752) synchronously.Cdma2000 MSM realizes Traffic Channel foundation (step 762) according to reaching the signaling (a for example Traffic Channel header (TCH header)) that is sent in the signaling (step 726) that is received on the F-FCH on a reverse link primary channel (R-FCH).F-FCH and R-FCH are the Traffic Channel among the cdma2000.Cdma2000 MSM walks around system's access state (referring to Fig. 5) of inter-system handoff, and this is because cdma2000 MSM is directly oriented to that a Dedicated Traffic Channel carries out that hard handoff switches and cdma2000 MSM does not need to enter this state and sets up Traffic Channel with exchange of signaling on forward and reverse shared channel.

In case set up Traffic Channel, application processor just switches to data path cdma2000MSM and begins to handle data (square 754) from cdma2000 MSM from UMTS MSM.For example, for a voice call, application processor switches to a cdma2000 vocoder from a UMTS vocoder.In many RAT device, also transmitter and receiver sub-district are suitably switched.

After being passed to application processor with one from this information from the UTRAN handover command, UMTS MSM can discharge unsettled UMTS and call out and independently or according to one stop using himself from the order of application processor.

After setting up Traffic Channel, cdma2000 MSM is sent to cdma2000 RAN with intact (Handoff Completion) message (HCM) of a handover, completes successfully (step 764) to indicate this handover.Then, cdma2000 RAN finishes a handover (Handoff Complete) message and is sent to target IS-41 MSC, to notify its handover success (step 766).Then, (Mobile Station on Channel, MSONCH) message is sent to source UMTS MSC (step 768) to target IS-41 MSC on channel with a travelling carriage by IWF.Source UMTS MSC is sent to UTRAN with a release command (Release Command) then on an Iu interface, call out (step 772) with the unsettled UMTS on the termination UTRAN side.Then, UTRAN finishes (Release Complete) message by this Iu interface with a release and is sent to source UMTS MSC, calls out with indication UMTS and has been released (step 774).Described in the TIA/EIA/IS-2001.3-B that is called " inter-operability specification (IOS) of cdma2000 access network interface (Interoperability Specification (IOS) for cdma2000Access Network Interfaces) " in name, implementation step 722 to 732 and step 762 are to 774.TIA/EIA/IS-2001.3-B has also set forth being used between MSC and the cdma2000 BSC interface and both can belong to the message of carrying out handover between the BSC that also can not belong to same MSC at two.

Fig. 7 is presented at that a radio bearer is set up and the simple handoff situations of many RAT device when being in the sub-state of conversation shown in Figure 5.Notion set forth in fig. 7 can extend to many RAT device wherein and be in and wait for the sub-state of order or wait for that mobile radio station replys the situation in the sub-state.

B. switch (MDHHO) to measure directed hard handoff

MDHHO is a kind of half-blindness inter-system handoff technology, and wherein source UTRAN relies on the positional information of many RAT device to come the best cdma2000 Target cell of choice device.Positional information can be measured or the like from the current existing round-trip delay (RTD) with set, place, base station of described many RAT device and derive.Now comprise the sub-district of communicating by letter with device with set.The MDHHO performance under the following conditions can deterioration: the layout of (1) cell-of-origin and/or (2) cell-of-origin and Target cell not closer to each other with the base station location of Target cell-it depends on the orientation of antenna for base station-different.The existence of repeater also can make the selection of Target cell complicated, and this additional delay that is the reason transponder is introduced can make the distortion of RTD estimated value, thereby makes the RTD estimated value become the indicatrix of the band deviation of many RAT setting position.If objective network supports hard handoff to switch and changes to soft handover that so that device can switch back and a plurality of cell communications at hard handoff, then the MDHHO performance can be improved.MDHHO is usually than the easier realization of MAHHO.

There are two kinds of situations in MDHHO.First kind of situation supposition cdma2000 MSM receives the timing that a handoff command fashion is not obtained cdma2000 RAN at many RAT device from UTRAN.Second kind of situation supposition cdma2000MSM obtained cdma2000 regularly when receiving this handoff command.

Fig. 8 show one when no first preamble information the exemplary program 800 of MAHHO.UTRAN starts handover and instructs described device to implement handover (step 812) by being sent to many RAT device with one from the UTRAN handover command." system message between RAT " information word is carried in this order, and this information word comprises the information of carrying out handover for the cdma2000 Target cell.UTRAN is according to determining the cdma2000 Target cell for the positional information that many RAT device uses.For example, UTRAN can use the positive Serving cell of UMTS to come a local data base of cdma2000 sub-district is inquired about as key.

UMTS MSM receives described order from the UTRAN handover, extracts target cell information and the information of being extracted is forwarded to application processor (step 814) from the order that is received.After upwards transmitting the information of being extracted, UMTS MSM can independently or according to one stop using himself from the order of application processor.Then, application processor starts cdma2000 MSM and gives one handoff command (step 816).Cdma2000 MSM opens the cdma2000 receiver and waits for receiver circuit preheating (square 820).After preheating, cdma2000 MSM begins that each cdma2000 Target cell is implemented pilot signal and obtains (step 822).For each cdma2000 pilot signal of being found, cdma2000 MSM all obtains with the synchronous of cdma2000 sub-district and adjusts its timing to this sub-district (square 824).Then, cdma2000 MSM enters the Traffic Channel (square 826) that the sub-state of traffic channel initialization (Traffic Channel Initialization) is set up the cdma2000 Target cell.Cdma2000 MSM walks around system's access (System Access) state because of it is directly oriented to a Dedicated Traffic Channel.Then, application processor switches to data path cdma2000 MSM (for example switching the voice call vocoder) and begins to handle data (square 828) from cdma2000 MSM from UMTS MSM.After having set up Traffic Channel, cdma2000 MSM has finished message with a handover and has been sent to cdma2000 RAN and completes successfully (step 832) to indicate this handover.

Do not have under the first preamble information situation MAHHO program on the UTRAN and core network one side as shown in Figure 7.

For the MAHHO program shown in Fig. 8, after the handoff command that receives from UTRAN, many RAT device implements to obtain synchronously and handover is carried out the two.When not knowing the timing information of cdma2000, can be elongated for implementing the required time quantum of handover.In order to accelerate handover, can promptly before starting handover, obtain the timing of cdma2000 in advance.

When (1) UMTS MSM is in the idle pulley and preempts broadcast system information Class1 a 3 (SystemInformation Type 13, SIB13) in the time of in the UMTS sub-district of information, or (2) UMTS MSM is in the connection mode and it is existing when comprising the UMTS sub-district of a broadcasting SIB 13 information with set, and many RAT device can obtain the cdma2000 timing.UMTS MSM be in (1) if in the idle pulley-its in UTRAN registration but without any activity and (2) if in the connection mode-it has data to transmit and/or to receive.This free time and connection mode are set forth among the 3GPP TS 25.331.SIB 13 information comprise the cdma2000 adjacent cell-its for the positive Serving cell of overlapping UMTS or as the neighbours' of the positive Serving cell of UMTS cdma2000 sub-district-system information (for example identity, the number of channel and band class).When communicating or preempting a UMTS sub-district with a UMTS sub-district, cdma2000 MSM can use SIB13 information to search for the cdma2000 adjacent cell.If UMTS MSM is in the connection mode, then it is decoded to the Broadcast Control Channel (BCCH) from a positive Serving cell of UMTS or a UMTS adjacent cell, to obtain management information bank (MIS) and SIB 13 both information, the two obtains the framing and the system frame number (SFN) regularly of an identification UMTS sub-district to use this then.

Fig. 9 show one when having first preamble information the exemplary program 900 of MAHHO.Program 900 comprises that one obtains a program 910 and a handover executive program 930 synchronously.When UMTS MSM was in free time or the connection mode, many RAT device implemented to obtain synchronously program 910 to obtain the timing of cdma2000 sub-district, if so that and can implement handover quickly when being instructed by UTRAN.When UTRAN instruction handover, many TAT device is implemented handover executive program 930.Handover executive program 930 is similar to the MAHHO program shown in Fig. 8, but does not comprise obtaining synchronously in the square 824.

For obtaining program 910 synchronously, UMTS MSM receives SIB 13 information (step 912) broadcasted by a UMTS sub-district and this information is forwarded to application processor (step 914).Then, application processor starts cdma2000 MSM and gives one search command (step 916).Cdma2000 MSM opens cdma2000 receiver (square 920), begin that each cdma2000 adjacent cell is implemented pilot signal and obtain (square 922), and obtain the synchronous and timing (square 924) of each cdma2000 sub-district with the pilot signal of being obtained.Can be as mentioned in Fig. 6, describedly come implementation step 920,922 and 924 at step 620,622 and 624 respectively.Cdma2000 MSM does not enter system's access state, paging channel (PCH) is not decoded, and does not implement registration on cdma2000 RAN.After the timing of obtaining the cdma2000 adjacent cell, cdma2000 MSM enters a resting state and only periodically wakes up these sub-districts are measured (square 926).

For handover executive program 930, UMTS MSM receives an order (step 932) from the UTRAN handover from UTRAN, extracts target cell information from the order that is received, and this information is forwarded to application processor (step 934).Then, application processor starts cdma2000 MSM (step 936).Cdma2000 MSM waits for receiver circuit preheating (square 940), the known already cdma2000 Target cell of each its timing information is implemented pilot signal obtain the sub-district timing of upgrading with acquisition (square 942) again, and to still unknown cdma2000 Target cell enforcement one search (square 942) of each its timing information.Then, cdma2000 MSM enters the sub-state of traffic channel initialization, with the Traffic Channel (square 944) of setting up the cdma2000 Target cell.Cdma2000 MSM walks around system's access state.Then, application processor switches to data path (for example vocoder) cdma2000 MSM and begins to handle data (square 946) from cdma2000 MSM from UMTS MSM.After having set up Traffic Channel, cdma2000 MSM finishes message with a handover and is sent to cdma2000 RAN, with indication handover success (step 952).

The program of handover executive program 930 on UTRAN and core network one side as shown in Figure 7.

C. the call re-establishment hard handoff switches (CRHHO)

CRHHO is a kind of inter-system handoff technology, wherein newly calls out and discharges unsettled calling on the positive service network rebuilding one on the objective network.Can implement call setup and call out to discharge to make handover be seamless and make communication disruption drop to minimum level at many RAT device.

Can use several programs-to initiate the call setup procedure of (MO)-carry out CRHHO by mobile device by the call setup procedure of mobile device termination (MT) and.For these two kinds of programs, UTRAN can trigger CRHHO according to different standards to target cdma2000 RAN.For example, can be according to trigger CRHHO:(1 to get off) the measured value that obtained to many RAT device, the positional information of (2) device, and/or (3) some other information or mechanism.Described measured value can be used for such as every chip pilot energy quality metrics such as interference ratio (Ec/Io), block error rate (BLER), traffic channel transmission power.Can use described measured value to survey many RAT device and when be arranged in UMTS overlay area, edge.Positional information can comprise many RAT device current existing with set, RTD measured value, or the like, and be used to survey near the edge when many RAT device be positioned at the UMTS overlay area.

Figure 10 A shows the first of the exemplary program 1000 of the CRHHO that is rebuild by the mobile device terminating call.At first, many RAT device is in active state when calling out with UTRAN.In order to reduce the handoff delay of CRHHO, cdma2000 MSM sets up at UMTS MSM and is activated when UMTS calls out, and remains in the travelling carriage idle condition, but do not register (square 1010) when being in this state in the time in cdma2000 RAN.

UTRAN starts a handover (step 1012) by sending an order from the UTRAN handover to many RAT device." system message between RAT " information word is carried in this order, and this information word comprises the information (for example frequency and band class) for cdma2000 Target cell handover.UTRAN MSM is received from the order of UTRAN handover, extracts target cell information and the information of being extracted is forwarded to application processor (step 1014) from the order that is received.Then, application processor starts cdma2000 MSM and wakes up/handoff command (step 1016) to one.

UTRAN also reorientates required message with one and is sent to source UMTS MSC, with request many RAT device is reorientated (step 1022).This message carries (1) information about identity, ability and the position of many RAT device, (2) time slot cyclical information, and the identity of (3) cdma2000 Target cell.Then, UMTS MSC in source carries the FACDIR2 message (or an information of equal value) (step 1024) of cdma2000 relevant information and target cell identification symbol to target IS-41 MSC transmission one by IWF.Then, target IS-41 MSC sends a paging request (Paging Request) message to the cdma2000BSC of cdma2000 Target cell, many RAT device is started a call setup procedure (step 1026) by the mobile device termination.Because current on this device have a unsettled UMTS to call out, so this message instructs described many RAT device to walk around prompting (for example No ringing).Then, (GeneralPage Message GPM) comes many RAT of paging device to send an IS-2000 general page messages corresponding to the cdma2000BTS of Target cell by the address with described many RAT device on paging channel.This GPM orders described many RAT device to walk around prompting.

After receiving wake command, cdma2000 MSM opens and preheating cdma2000 receiver (square 1030), and its cdma2000 Target cell of regularly being learnt is already implemented cdma2000 Target cell that pilot signal is obtained (step 1032) again and its timing is not learnt as yet to each and implemented a Cell searching (still square 1032) to each.Then, its cdma2000 sub-district that has regularly obtained obtaining receives IS-2000 general page messages (General Page Message) (step 1028) and comes the Overhead of each cdma2000 sub-district is upgraded (square 1034) with a GPM who is received cdma2000 MSM from each.Cdma2000 MSM enters system's access state of each cdma2000 sub-district and sends Access Probe (square 1036) by an access channel that is used to insert cdma2000 RAN on reverse link with the Overhead that has upgraded.After receiving this GPM, (Page Response Message PRM) is sent to cdma2000 RAN so that (step 1038) confirmed in this paging to cdma2000 MSM with an IS-2000 page-response message.

Figure 10 B shows the second portion of CRHHO program 1000.Behind the PRM that receives from many RAT device, cdma2000 RAN (1) implements a call setup procedure 1040 and newly calls out to set up one with many RAT device, and (2) start the current calling of calling release procedure 1060 to terminate between described device and the UTRAN.Program 1040 can be implemented simultaneously and can be timed to the minimally of communicating by letter of many RAT device is interrupted with program 1060.

For call setup procedure 1040, cdma2000 RAN confirms that with a base station order (BS Ack Order) is sent to cdma2000 MSM to confirm to receive this PRM (step 1042).Then, cdma2000 RAN sends (1) one IS-2000 Extended Channel Assignment Message (Extended Channel AssignmentMessage to cdma2000 MSM, ECAM), to start the foundation (step 1044) of a Traffic Channel, and the IS-2000 service of the service configuration of the new cdma2000 calling of (2) one regulations connects (Service Connect Message, SCM) message (step 1046).Cdma2000 MSM finishes message (Service Connect Complete Message) with IS-2000 service connection and is sent to cdma2000 RAN, to confirm to receive this SCM (step 1048).Then, cdma2000 MSM begins service configuration according to defined to handling from the communication of cdma2000 RAN.

After finishing service configuration, cdma2000 MSM notifies application processor: the service to cdma2000 RAN has connected (step 1052).Then, terminate current UMTS of application processor order UMTS MSM calls out (step 1054), and data path is switched to cdma2000 MSM (for example switching the voice call vocoder) and begins handle (square 1056) from the data of cdma2000 MSM from UMTS MSM.

For calling out release procedure 1060, cdma2000 RAN sends an IS-2000 page-response message to confirm paging request message (step 1062) to target IS-41 MSC.Then, target IS-41 MSC sends travelling carriage message of (MSONCH) on channel by IWF to source UMTSMSC and notifies the described calling of UMTS MSC to be subjected to IS-41 MSC control (step 1064) this moment.Connect trunk line between MSC and with the data flow of many RAT device from then on towards target IS-41 MSC (rather than UMTS MSC) routing again (square 1070).For voice call, use pulse code modulated (PCM) that simulated voice is encoded into the 64Kbps numerical data, and the PCM of many RAT device is flowed towards target IS-41 MSC routing again.Then, UMTS MSC in source sends a release command (step 1072) to UTRAN on the Iu interface.After receiving this order, UTRAN connect to discharge (RRC Connection Release) message (step 1074) and receives a RRC from UMTS MSM and connect to discharge and finish (RRC Connection Release Complete) message and come that many RAT device is implemented a RRC and connect release procedure (step 1076) by send a RRC to UMTS MSM.Then, UTRAN finishes (ReleaseComplete) message by the Iu interface to source UMTS MSC transmission one release and has been released (step 1078) with indication UMTS calling.After discharging the UMTS calling, UMTSMSM off-line (square 1080).

Figure 11 A is presented at by the make a call first of the exemplary program 1100 of CRHHO when rebuilding of mobile device.At first, many RAT device is in active state when carrying out a calling with UTRAN, and UMTS MSM is in (square 1108) in the connection mode, and cdma2000 MSM is off-line (square 1110) then.

UTRAN starts a handover by sending an order from the UTRAN handover to many RAT device, and " system message between the RAT " information word (step 1112) that has the cdma2000 target cell information is carried in described order from the UTRAN handover.UMTS MSM is received from the order of UTRAN handover and extracts target cell information and it is provided to application processor (step 1114).Then, application processor starts cdma2000 MSM and gives one and wakes up/handoff command (step 1116).UTRAN also sends one by source UMTS MSC to IWF and reorientates required message to ask that many RAT device is reorientated (step 1118).

After receiving handoff command, cdma2000 MSM opens and preheating cdma2000 receiver (square 1120), each cdma2000 Target cell is implemented pilot signal obtain (square 1122), obtain the synchronous and timing (square 1124) of each cdma2000 sub-district with the pilot signal of obtaining, renewal have obtained synchronously and each cdma2000 system information of subdistricts (square 1126) regularly, and enter system's access state and attempt inserting and have each cdma2000 sub-district (square 1128) of updating system information.

Figure 11 B shows the second portion of CRHHO program 1100, and it comprises a call setup procedure 1130 and a calling release procedure 1160.For call setup procedure 1130, after the system that completes successfully inserted, cdma2000 MSM just comprised the IS-2000 originating information (Origination Message) (step 1132) of a predefine feature code string that is associated with call re-establishment to cdma2000 RAN transmission one.Then, cdma2000 RAN comprises service request (Service Request) message (step 1134) of feature code string to target IS-41 MSC transmission one.Target IS-41 MSC responds by sending an assignment request (Assignment Request) message, and this assignment request message comprises by cdma2000 RAN and is used for setting up an information (step 1136) that is connected with cdma2000 MSM.Then, cdma2000RAN sends (1) one Extended Channel Assignment Message (Extended Channel Assignment Message), many RAT device is directed to (step 1138) and (2) the one IS-2000 service connection messages (Service Connect Message) (step 1142) for new cdma2000 calling regulation service configuration on the Traffic Channel.Cdma2000 MSM finishes message (Service Connect Complete) with IS-2000 service connection, and (step 1144) responds.

After this, cdma2000 MSM begins to handle communication from cdma2000 RAN according to the service configuration of defined.Cdma2000 MSM also notifies application processor that the service of cdma2000 RAN has been connected (step 1152).Then, terminate current UMTS of application processor order UMTS MSM calls out (step 1154), data path is switched to cdma2000 MSM (for example switching the voice call vocoder) from UMTS MSM, and begin handle (square 1156) from the data of cdma2000 MSM.

For calling out release procedure 1160, the service of receiving connect finish message after, cdma2000 RAN finishes an assignment (Assignment Complete) message and is sent to target IS-41 MSC (step 1162).Then, target IS-41 MSC sends a signaling message to source UMTS MSC, this signaling message comprise (1) with an IS-41 travelling carriage on channel in the message institute's carry information equate the identity (step 1164) of the information of valency and (2) cdma2000 Target cell.Indication that IWF will be received from IS-41 MSC and unsettled call re-establishment example combine (step 1066).Connect trunk line between MSC this moment, and since then with the data (for example PCM) of many RAT device stream towards target IS-41 MSC routing again (square 1170).Then, in (its corresponding to the step 1072 among Figure 10 B to 1076), discharge UMTS by signaling and call out to 1176 in step 1172.

For for the CRHHO of UMTS to cdma2000, it is general that UMTS MSM seems that seemingly it is discharging a unsettled calling, cdma2000 MSM then seem seemingly its setting up one new call out general.Generally speaking, can use the existing network entity to implement CRHHO and do not need UMTS and cdma2000 protocol stack are done any change.CRHHO does not need new function, does not for example need to make amendment to being used for the calling control that (1) make a call in cdma2000 in UMTS call release and (2).The new information (new expansion) that may only need be used for CRHHO.In addition, can can not interrupt or the situation of minimally break in service under implement CRHHO.

Described herein inter-system handoff technology make the device of RAT more than can be with a seamless way from a network handover to another network.Different handoff techniques has different requirements and advantage.

Handoff techniques.

Table 1 is listed the requirement to these handoff techniques.

Table 1

	Requirement	Advantage
			(a) MAHHO	RRC and RANAP need expansion.Need IS-41 HAP at source MSC place.Cdma2000 MSM need make up once the protocol state machine of revising.UMTS MSM need handle two new informations.Because of not needing to transmit simultaneously this two MSM, so only need a power amplifier.	Reliable and the handoff delay of the selection of Target cell shortens.Do not need cdma2000 core network and BSC are done any change.
(b) MDHHO (not having first preamble information)	RANAP needs expansion.Need IS-41 HAP at source MSC place.Cdma2000 MSM need make up once the L3 state machine of revising.Because of not needing to transmit simultaneously this two MSM, so only need a power amplifier.	RRC needs expansion.Influence to UMTS MSMR is less.
			(c) MDHHO (having first preamble information)	RANAP needs expansion.Need IS-41HAP at source MSC place.Cdma2000 MSM need make up once the protocol state machine of revising.UMTS MSM need read SIB 13.Because of not needing to transmit simultaneously this two MSM, so only need a power amplifier.	Handoff delay is shorter than (b).(a) is easier at many RAT device place structure but than (b) complexity.
(d) CRHHO	RRC and RANAP need new procedures and agreement to change.Handoff delay is elongated.Because of needs transmit this two MSM simultaneously, so need two power amplifiers.	Development cost when making up is minimum.Need not UTRAN is done any change.

RANAP (radio access network applying portion) is the interface between core network and the UTRAN RNC, and with IS-41 in A1 interface equivalence.

Can come handoff techniques between constructing system by all means.For example, these technology can be implemented in hardware, software or the one combination.For the constructed in hardware scheme, be used for to be implemented in one or more ASIC, digital signal processor (DSP), digital signal processing device (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, other are designed in the electronic unit or one combination of implementing function described herein at the processing unit that wireless device (for example the UMTS MSM210a of Fig. 2, cdma2000 MSM 210b and application processor 240) is located handover between implementation system.Equally, the processing unit that is used for handover between the network side back-up system can be implemented in one or more ASIC, DSP, or the like.

For the software building scheme, can come handoff techniques between constructing system by the module that can implement function described herein (for example program, function, or the like).The software code can be stored in the memory cell (for example memory among Fig. 2 242) and by a processor (for example application processor 240) and carry out.Memory cell both can be implemented in and also can be implemented in the processor outside the processor, and in such cases, memory cell can be coupled to processor with communication mode by various devices known in the affiliated field.

Above-mentioned explanation to announcement embodiment is intended to make the those skilled in the art can make or use the present invention.The those skilled in the art will be easy to draw the various modifications of these embodiment, and the General Principle that this paper defined is also applicable to other embodiment, and this does not deviate from the spirit or scope of the present invention.Therefore, this paper is intended to the present invention is defined in embodiment illustrated herein, and desires to give itself and principle disclosed herein and novel feature the broadest corresponding to category.

Claims (29)

1, a kind of wireless device that communicates with first and second cordless communication network that moves with different radio access technologies, it comprises:

One first modem processor, its operation is to carry out processing to one with the unsettled calling of described first wireless network, receive one first message with the handover of execution from described first wireless network, and the notice of described handover is provided to described second wireless network; And

One second modem processor, its operation is newly called out to set up one with described second wireless network to exchange one second message with described the two or two wireless network, carry out one with the call setup procedure of described second wireless network setting up described new calling, and handle carrying out with the described new calling of described second wireless network.

2, wireless device as claimed in claim 1, it further comprises:

One application processor, it moves to receive described notice from described first modem processor, instructs described second modem processor to set up described new calling, and instructs described first modem processor to discharge described unsettled calling.

3, wireless device as claimed in claim 2, wherein said application processor operation is to instruct described first modem processor to discharge described unsettled calling at once so that service disruption is reduced to bottom line in described new call setup or after described new calling has been set up.

4, wireless device as claimed in claim 1, wherein said first wireless network implement Wideband Code Division Multiple Access (WCDMA) (W-CDMA) and described second wireless network is implemented IS-2000.

5, wireless device as claimed in claim 4, the operation of wherein said second modem processor to be carrying out a call setup procedure by mobile device termination (MT) by the IS-2000 defined, and wherein said second message is a general page messages that is sent by described second wireless network.

6, wireless device as claimed in claim 4, the operation of wherein said second modem processor with carry out one by the IS-2000 defined initiate the call setup procedure of (MO) by mobile device, and wherein said second message is one to be sent to the initiation message of described second wireless network.

7, wireless device as claimed in claim 1, wherein said unsettled and new calling is voice call.

8. wireless device as claimed in claim 1, the operation of wherein said first modem processor is to keep one to be used for first protocol stack that communicates with described first wireless network and the operation of described second modem processor to keep one to be used for second protocol stack that communicates with described second wireless network.

9, wireless device as claimed in claim 1, wherein said second modem processor operation is obtained and Cell searching again optionally to carry out pilot signal, the system information of acquisition through upgrading, and the system that carries out described second wireless network inserts to set up described new calling.

10, wireless device as claimed in claim 1, it can move to communicate with described first and second wireless network simultaneously.

11, wireless device as claimed in claim 1, wherein said handover are to be triggered according to the measured value that described wireless device obtained by described first wireless network.

12, wireless device as claimed in claim 1, wherein said handover are to be triggered by the positional information of described first wireless network according to described wireless device.

13, a kind of method that is used between first and second cordless communication network of different radio access technologies, carrying out a handover, it comprises:

The unsettled calling of processing one and described first wireless network;

Receive one first message to carry out a handover to described second wireless network from described first wireless network;

Exchanging one second message with described second wireless network newly calls out to set up one with described second wireless network;

The call setup procedure of execution one and described second wireless network is to set up described new calling; And

The described new calling of processing and described second wireless network, and

Wherein said processing one unsettled calling and described reception one first message are to be carried out by one first modem processor, and wherein said exchange one second message, carry out a call setup procedure, and to handle described new calling be to be carried out by a second modem processor.

14, method as claimed in claim 13, wherein said first wireless network implement Wideband Code Division Multiple Access (WCDMA) (W-CDMA) and described second wireless network is implemented IS-2000.

15, a kind of operation between first and second cordless communication network of different radio access technologies, to carry out the equipment of a handover, it comprises:

Be used to handle one with the device of the unsettled calling of described first wireless network;

Be used for receiving one first message to carry out one to the described second wireless network zone-skipping device for switching from described first wireless network;

Be used for exchanging one second message to set up a new device of calling out with described second wireless network with described second wireless network;

Be used to carry out one with the call setup procedure of described second wireless network to set up the device of described new calling; And

Be used to handle the device with the described new calling of described second wireless network, and

The described device that wherein is used to handle the described device of a unsettled calling and is used to receive one first message is independent of the described device that is used to exchange one second message, the described device that is used to carry out the described device of a call setup procedure and is used to handle described new calling.

16, equipment as claimed in claim 15, wherein said first wireless network implement Wideband Code Division Multiple Access (WCDMA) (W-CDMA) and described second wireless network is implemented IS-2000.

17, a kind of UMTS (Universal Mobile Telecommunications System) terrestrial radio access network (UTRAN), it comprises:

Be used to handle the device of the unsettled calling of one and one wireless device;

Be used for one first message is sent to described wireless device to carry out a device to cdma2000 radio access network (RAN) handover;

Be used for one second message is sent to the device that a UMTS mobile switching centre (MSC) is repositioned to described wireless device with request described another MSC of cdma2000 RAN;

Be used to receive a indication about and a new calling described cdma2000 RAN that set up for described wireless device; And

Device with the described unsettled calling of described wireless device is used to terminate.

18, a kind of wireless device that communicates with first and second cordless communication network that moves with different radio access technologies, it comprises:

One first modem processor, its operation is to carry out processing to one with the unsettled calling of described first wireless network, receive one first message carrying out a handover to described second wireless network from described first wireless network, and the notice of described handover is provided;

One second modem processor, its operation with set up one's own business affair channel and carry out with the new calling of described second wireless network and to handle of described second establishing wireless network; And

One application processor, it moves to receive described notice from described first modem processor and to instruct described second modem processor to set up the described new calling of described Traffic Channel and processing and described second wireless network.

19, wireless device as claimed in claim 18, wherein said first wireless network implement Wideband Code Division Multiple Access (WCDMA) (W-CDMA) and described second wireless network is implemented IS-2000.

20, wireless device as claimed in claim 18,

Wherein said first modem processor further operation carries second message that is used at the list of frequency of the described second wireless network search cell to receive one from described first wireless network, and send the 3rd message that carries the Search Results of described list of frequency to described first wireless network, and

Wherein said second modem processor further operation described list of frequency is carried out pilot signal is obtained and Cell searching and described Search Results is provided.

21, wireless device as claimed in claim 18 wherein comprises the information of one or more Target cells in described second wireless network that described wireless device is handed off to from described first message of described first wireless network.

22, wireless device as claimed in claim 21, wherein said one or more Target cells are determined from the Search Results to a list of frequency in described second wireless network of described second modem processor by described first wireless network basis.

23, wireless device as claimed in claim 18, wherein said second modem processor further operation complete successfully with the described handover of indication to described second wireless network so that one second message is sent to described second wireless network.

24, wireless device as claimed in claim 18, the operation of wherein said first modem processor is with the described unsettled calling of termination and described first wireless network independently after the described notice of described handover is provided.

25, wireless device as claimed in claim 18, wherein said application processor further operation to instruct the described unsettled calling of described first modem processor termination and described first wireless network.

26, wireless device as claimed in claim 18, wherein said first wireless network is according to the described unsettled calling that terminates of the signaling between described first and second wireless network.

27, a kind of method of between first and second cordless communication network of different radio access technologies, carrying out a handover, it comprises:

The unsettled calling of processing one and described first wireless network;

Receive one first message from described first wireless network, to carry out a handover to described second wireless network;

With described second establishing wireless network affair channel of setting up one's own business; And

The new calling of processing one and described second wireless network, and

Wherein said processing one unsettled calling and described reception one first message are to be carried out by one first modem processor, and wherein saidly set up Traffic Channel and described processing one new the calling is to be carried out by a second modem processor.

28, method as claimed in claim 27, wherein said first wireless network implement bandwidth code division multiple access (W-CDMA) and described second wireless network is implemented IS-2000.

29, a kind of operation between first and second cordless communication network of different radio access technologies, to carry out the equipment of a handover, it comprises:

Be used to handle one with the device of the unsettled calling of described first wireless network;

Be used for receiving one first message to carry out a device to the handover of described second wireless network from described first wireless network;

Be used for and the set up one's own business device of affair channel of described second establishing wireless network; And

Be used to handle one with the device of the new calling of described second wireless network, and

The described device that wherein is used to handle the described device of a unsettled calling and is used to receive one first message is independent of and is used to set up the described device of Traffic Channel and is used to handle a new described device of calling out.

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