CN1921701B - Network switching method - Google Patents
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Abstract
The invention relates to a network switch method and communication network system. Wherein, said method comprises: HPRD network sends network switch request to the CDMA2000 lx network, and reports theregion marks and pilot measure information of at least two BS regions that need to be switched to CDMA2000 lx network; each BS distributes service channel for the terminal; CDMA2000 lx network instructs the HRPD network to send switch command to the terminal and inform the terminal about the service channel distributed by BS; terminal receives said switch command, based on the information of service channel, to catch the service channel distributed at any region by any BS. The invention can reduce the time delay of catching service channel when the terminal at the edge of several BS and processing network switch, to improve the reliability of network switch.
Description
Technical field
The present invention relates to the communications field, relate to a kind of method for switching network that the HRPD network switches to the CS voice of CDMA2000 1x network especially.
Background technology
Code division multiple access (Code Division Multiple Access is called for short CDMA) technology is a kind of a kind of brand-new and ripe wireless communication technology based on spread spectrum.Along with the growth rate of CDMA data service user permeability is constantly accelerated, still, with respect to less CDMA userbase, slower growth rate has become the bottleneck of CDMA data service development in recent years.
High-speed data (High Rate Packet Data, abbreviation HRPD) technology is arisen at the historic moment under such market promotes just, although the Data-carrying ability of CDMA2000 1x is greatly improved, also there is bottleneck on the interface of eating dishes without rice or wine for abundant multimedia service.For the bottleneck problem that solves the interface of eating dishes without rice or wine has proposed the HRPD technology.The HRPD technology is a kind of CDMA2000 1x Enhanced Technology, only support data service and non-support voice business, main target is to improve the message transmission rate of wave point, with respect to CDMA2000 1x technology, HRPD has two big advantages: peak rate height, HRPD technology can provide the data rate of forward direction up to 2.4Mbit/s; Capacity is big, and supported user is many.
HRPD and CDMA 1x can finish the function of 3G high speed transmission data and efficient voice signal in conjunction with networking.HRPD only provides the non-real-time data business, and wherein the forward direction peak rate is up to 3.1Mb/s.HRPD is suitable for professional exploitation such as similar Streaming Media and big file download.As for real time business (as speech), can by with cdma2000 1x network cooperate or the mode of IP-based voice transfer (Voice Over InternetProtocol, be called for short VoIP) realizes.
HPRD network and CDMA 1x network interconnected mainly exists Fig. 1, two kinds of interconnect schemes shown in Figure 2.As shown in Figure 1, the HRPD network is connected by mobile switching centre's (Mobile Switching Center is called for short MSC) of A1 and/or A1p interface and CDMA 1x network.As shown in Figure 2, the HRPD network is connected by the base station (Base Station is called for short BS) of A21 interface and CDMA 1x network.
In the prior art, when terminal switches to circuit domain (CS) voice of CDMA20001x network by HRPD network VoIP, direct-cut operation flow process between simulation BS, can only switch to the affiliated some sub-districts of a BS, when portable terminal is in as Fig. 1 or position (promptly being in the border of BS sub-district) shown in Figure 2, portable terminal can only switch to the BS201 subordinate's of CDMA2000 1x network sub-district 100, perhaps, switches to the BS203 subordinate's of CDMA2000 1x network sub-district 104.
But because terminal 400 is in cell boarder, the signal of each sub-district all a little less than, the probability that terminal 400 is caught each cell signal is suitable, suppose that network decision-making chosen the sub-district 100 BS201 under as switching purpose sub-districts, BS201 is that terminal 400 has been distributed Traffic Channel, but terminal 400 has been caught the pilot channel of sub-district 104 earlier, and receive the Sync Channel Message of sub-district 104, terminal 400 is checked pilot frequency deviation parameter (PILOT_PN), find it is not switching target small area, the pilot channel that then needs once more search cell 100, receive the Sync Channel Message of sub-district 100 again, check the pilot frequency deviation parameter, discovery is a switching target small area 100, just sends by the Traffic Channel of distributing and handovers complete message to BS201, indication is finished Traffic Channel and is caught, promptly switch and finish, terminal 400 begins by Traffic Channel then, carries out the transmitting-receiving of CS speech business data.
And owing in the sub-district of carrying out switching to a BS subordinate, cause when terminal is in the border of the sub-district under some BS, existence may be carried out repeatedly the checking process of acquisition pilot channel and pilot frequency deviation parameter, causes handover delay big.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method for switching network, improves when terminal is in the border of the sub-district under the several base stations under the CDMA2000 1x network, and terminal is by the reliability of HRPD network to the switching of CDMA2000 1x network.
For solving the problems of the technologies described above, the objective of the invention is to be achieved through the following technical solutions:
A kind of method for switching network, described network switching is meant that terminal switches to CDMA2000 1x network by high speed data network, comprising:
High speed data network sends the network handoff request to CDMA2000 1x network, and reports the cell ID of base station subordinate's purpose sub-district in the CDMA2000 1x network and the pilot measurement information of described purpose sub-district to CDMA2000 1x network; The number of described base station is at least two;
High speed data network is selected first-selected sub-district from described purpose sub-district, it is the terminal distribution Traffic Channel that CDMA2000 1x network is notified the base station under the described first-selected sub-district, and by the base station under soft handover order indication other purpose sub-districts except that described first-selected sub-district is the terminal distribution Traffic Channel, after base station under described other purpose sub-districts was the terminal distribution Traffic Channel, the base station was returned as the traffic channel information of terminal distribution under described first-selected sub-district;
CDMA2000 1x network indication high speed data network issues switching command to terminal, and described each base station of notice terminal traffic channel information that is terminal distribution;
After terminal is accepted described switching command,, catch the Traffic Channel of arbitrary described base station in arbitrary purpose cell allocation according to described traffic channel information.
The method of the invention, alternatively, the purpose sub-district of described purpose CDMA2000 1x network is chosen acquisition according to CDMA2000 1x network in the pilot measurement information of terminal position by high speed data network.
The method of the invention, alternatively, high speed data network is obtained and reported to described pilot measurement information by the terminal measurement.
The method of the invention, alternatively, obtaining of described pilot measurement information specifically comprises:
The terminal to report high speed data network is in the pilot measurement information of terminal position;
High speed data network is according to the pilot measurement information of described high speed data network, and the networking information of CDMA20001x network, and the pilot measurement information of the CDMA2000 1x network of terminal position is obtained in estimation.
The method of the invention, alternatively, high speed data network is connected with the base station of CDMA2000 1x network, and high speed data network specifically is that the base station under described first-selected sub-district sends described handoff request, and reports described pilot measurement information.
The method of the invention, alternatively, high speed data network is connected with the mobile switching centre of CDMA2000 1x network, and high speed data network specifically is to send described network handoff request to described mobile switching centre, and reports described pilot measurement information;
After described each base station is respectively the terminal distribution Traffic Channel, CDMA2000 1x network indication high speed data network is before terminal issues switching command, further, base station under the described first-selected sub-district is the traffic channel information that terminal is distributed with described each base station, reports to described mobile switching centre;
Described mobile switching centre indication high speed data network issues switching command to terminal, and the described traffic channel information of notice terminal.
The method of the invention, alternatively, base station under described mobile switching centre or the described first-selected sub-district receives after the pilot measurement information of the cell ID of purpose sub-district in the CDMA2000 1x network and described purpose sub-district, each base station is respectively before the terminal distribution Traffic Channel, further comprises:
Base station under described mobile switching centre or the described first-selected sub-district is according to the service bearer situation of the purpose sub-district in the described CDMA2000 1x network, from described purpose sub-district, further screen new purpose sub-district, and in described new purpose sub-district, redefine first-selected sub-district.
Above technical scheme as can be seen, because the HRPD network is when described CDMA2000 1x network sends the network handoff request among the present invention, choose at least one sub-district under at least two base stations of CDMA2000 1x network of current mobile terminal position as switching the purpose sub-district, promptly choose some sub-districts of belonging to a plurality of BS as switching the purpose sub-district, report the cell ID and the pilot measurement information of all purpose sub-districts to CDMA2000 1x network, CDMA2000 1x is a HRPD terminal distribution Traffic Channel in all purpose sub-districts, as long as the HRPD terminal captures the Traffic Channel that any one base station issues in any one sub-district, promptly can switch to CDMA2000 1x network.Significantly reduce the time delay of capture terminal Traffic Channel, guaranteed the reliability that network switches more.
Description of drawings
Fig. 1 is the interconnection system logical construction schematic diagram of a kind of HRPD network and CDMA2000 1x network;
Fig. 2 is the interconnection system logical construction schematic diagram of another kind of HRPD network and CDMA2000 1x network;
Fig. 3 is the schematic flow sheet that uses the inventive method in network interconnection system shown in Figure 1;
Fig. 4 uses the signal flow of method shown in Figure 3 to schematic diagram;
Fig. 5 is the schematic flow sheet that uses the inventive method in network interconnection system shown in Figure 2;
Fig. 6 uses the signal flow of method shown in Figure 5 to schematic diagram;
Fig. 7 is the structural representation of the communication system of embodiment 3;
Fig. 8 is the structural representation of the communication system of embodiment 4.
Embodiment
Core concept of the present invention is, when the HRPD network sends the network handoff request to described CDMA2000 1x network, choose at least one sub-district under at least two base stations of CDMA2000 1x network of current mobile terminal position as switching the purpose sub-district, report cell ID and the pilot measurement information of respectively switching the purpose sub-district to CDMA2000 1x network, network based this cell ID of CDMA2000 1x and pilot measurement information, in each switches the purpose sub-district, be this terminal distribution Traffic Channel respectively, and with the traffic channel information that distributes to some extent, by the HRPD forwarded to terminal, as long as the terminal that is in the HRPD network is according to this traffic channel information, captures the Traffic Channel that any one base station issues and promptly can switch to CDMA2000 1x network.Reduced when terminal is in the border of the sub-district under the several base stations under the CDMA2000 1x network, terminal switches in the CDMA2000 1x network development process, catches the time delay of the Traffic Channel of CDMA2000 1x network allocation, has guaranteed the reliability that network switches.
In order to make those skilled in the art better understand technical solution of the present invention, content of the present invention is further detailed below in conjunction with accompanying drawing and specific embodiment:
Embodiment 1:
Present embodiment is an example with network interconnection structure shown in Figure 1, is specifically described using the inventive method, and Fig. 3 is the schematic flow sheet of present embodiment method, shows as Fig. 3, and this method may further comprise the steps:
Step S301: terminal 400 reports pilot measurement information to the access network 301 of HRPD network 300.
Because the HPRD network is with respect to CDMA2000 1x network, the HPRD network can provide higher preceding, reverse link, particularly forward link can be up to 2.4576Mbps, better support streaming media service, the HRPD network is typical in professional enterprise virtual private network access of virtual private network (Virtual PrivateNetwork, be called for short VPN), Email, MP3, Wet browse or ecommerce, audio or video information service (Video-On-Demand is called for short VOD), Digital Television, video telephone, video conference etc.
Yet, as for real time business (as speech), can by with cdma2000 1x network cooperate or the mode of IP-based voice transfer (Voice Over Internet Protocol, be called for short VoIP) realizes.But, owing to support that the terminal cost of VoIP is higher, support that the VoIP terminal is general inadequately, and its efficient is not as the CS voice, therefore, from the operation and cost consideration, present air interface CSTDM mode is more reasonable with respect to the IP mode, and at moving communicating field, also can there be the quite a long time in the CS voice.Therefore need switch to the CDMA2000 1x network carrying usually for real time business finishes.
When portable terminal is in the BS border, terminal 400 as shown in Figure 1 is in two cell boarders of BS201 subordinate's sub-district 100 and BS202 subordinate's sub-district 104, portable terminal 400 is specified or automatically or by access network 301 by other Event triggered, catch the pilot frequency information of the BS201 subordinate sub-district 100 and the BS203 subordinate sub-district 104 of its position, and it is measured, and report its pilot measurement information to the access network 301 of HRPD network 300.
What deserves to be explained is, if also there are other sub-districts of BS201 or BS203 in terminal 400 positions, perhaps, also there is the sub-district that belongs to other BS except that BS201 or BS203, then terminal 400 is measured the pilot signal that its position belongs to each sub-district of each BS simultaneously, and pilot measurement information is reported to access network 301.
If terminal 400 can not be monitored the pilot frequency information of CDMA2000 1x network, then terminal 400 is monitored the pilot tone of the HPRD network of position, and measure, obtain pilot measurement information, and report the pilot measurement information of this HPRD network to access network 301, according to the pilot measurement information that reports, connect the CDMA2000 1x network information by access network 301, estimate the pilot measurement information of the CDMA2000 1x network of this terminal position in conjunction with being attached thereto of knowing of access network 301.
Step S302: access network 301 is according to pilot measurement information, and whether decision-making needs the CDMA2000 1x network that switches to, if desired, and execution in step S303, otherwise, execution in step S311.
Whether access network 301 is fit to the business of support terminal 400 more according to the current CDMA2000 1x network environment of the pilot measurement information decision-making of CDMA2000 1x network, if, execution in step S303 then, otherwise, execution in step S311 continues to make terminal 400 to use the HRPD network to carry out service communication.
Step S303: the switching purpose sub-district of the CDMA2000 1x network that access network 301 decision-makings need switch to, and notify terminal 400 to switch to CDMA2000 1x network, and send handoff request to MSC202 simultaneously, report and switch the purpose cell information.
Step S304:MSC202 receives and resolves handoff request, and indication BS201 is terminal 400 distribution service channels, and the soft handover of indication BS201 between BS203 initiation BS.
MSC202 receives this handoff request, obtain each sub-district (sub-district 100 as shown in Figure 1 and the sub-district 104) sign in the pilot measurement information, and the BS under each sub-district (BS201 under the sub-district 100 as shown in Figure 1 and BS203 under the sub-district 104) sign.
From switch the purpose cell information, know first-selected sub-district, and select first-selected sub-district--BS201 is as main BS under the sub-district 100.
MSC202 sends handoff request to BS201, the soft handover request of indication BS201 between BS203 initiation BS, and indication BS201 is terminal 400 distribution service channels.
What deserves to be explained is that in this step, MSC202 receives after this handoff request, the current service bearer situation in purpose sub-district of respectively switching itself that can also know according to, in former switching purpose sub-district, purpose sub-district and first-selected sub-district are switched in decision-making again.Suppose that MSC202 receives switching purpose sub-district that access network 301 reports for belonging to 3 sub-districts of 3 BS respectively, and suppose that sub-district 1 is first-selected sub-district, but MSC202 knows that the service bearer of sub-district 1 is full, and other two sub-districts: the service bearer of sub-district 2 and sub-district 3 is idle, MSC202 is according to the current business load situation so, again choosing switching purpose sub-district is: sub-district 2 and sub-district 3, and choose the higher sub-district of pilot frequency intensity 2 as first-selected sub-district, and MSC202 is with the information return value access network 301 of this gravity treatment switching cell, and notice access network 301 upgrades in the HRPD network.
Convenient for following description, suppose that MSC202 is consistent with the decision-making of access network 301 for the decision-making of switching purpose sub-district and first-selected sub-district.
Step S305:BS201 is terminal 400 distribution service channels, and the soft handover between execution and BS203.
After BS201 receives the handoff request that MSC202 issues,,, in sub-district 100 terminal 400 distribution service channels with suitable transmitted power according to cell ID, the pilot measurement information of carrying in the request.
Simultaneously, BS201 indicates according to handoff request, the soft handover between execution and the BS203.
Step S306:BS203 carries out operating in soft handover, and is returned as the traffic channel information that terminal 400 is distributed to BS201.
BS203 receives the soft handover request that BS201 initiates, indicate according to the soft handover that BS201 initiates, operating in soft handover between execution and the BS201 is the Traffic Channel that terminal 400 is distributed in sub-district 104, and is returned as the traffic channel information that terminal 400 is distributed to BS201.
Step S307:BS201 notice MSC202 traffic channel assignments is finished.
After BS201 receives the traffic channel information that is issued for terminal 400 that BS203 returns, to MSC202 send BS201 in the sub-district 100, BS203 104 is respectively the traffic channel information that terminal 400 is distributed in the sub-district, notifies MSC202 simultaneously: for the traffic channel assignments of terminal 400 is finished.
Step S308:MSC202 sends switching command to access network 301.
After MSC202 receives the switching request acknowledgement message of BS201, send order by A1 or A1p network interface to access network 301, indication access network 301 issues to terminal 400 and switches indication, indicating terminal 400 begin to catch BS201 in the sub-district 100 or BS203 in the sub-district 104 Traffic Channels that issue for terminal.
Step S309: terminal 400 is caught the Traffic Channel of BS201 or BS202 distribution, begins to be undertaken by the Traffic Channel of catching the transmitting-receiving of speech business data.
The switching command that access network 301 sends according to MSC202 sends switch indicating information to terminal 400; After terminal 400 receives switch indicating information, catch BS201 in the sub-district 100 or BS203 in the sub-district 104 Traffic Channels that issue for terminal, as long as terminal 400 captures the pilot signal that the arbitrary BS of BS201, BS203 is arbitrary Traffic Channel of issuing of terminal, and Sync Channel Message, then terminal switches to CDMA20001x network 200, begins to carry out the transmitting-receiving of speech data by the Traffic Channel that this pilot channel affiliated subdistrict distributes.
So far, terminal 400 successes switches to CDMA2000 1x network 200 by HRPD network 300.Therefore, owing to adopt the inventive method, when the switching purpose sub-district of decision-making CDMA2000 1x network, at least one sub-district that belongs to two BS at least in all sub-districts that the selection position exists is as switching the purpose sub-district, promptly switch BS and be not limited to one, as long as so terminal 400 capture the Traffic Channel that the position exists the arbitrary BS under the sub-district to issue and promptly can switch to CDMA2000 1x network.And do not exist when terminal is in the border of several BS, because the BS that switches under the purpose sub-district is only limited to one situation, and when causing BS (this BS is the switching target BS for setting) under capturing the sub-district that the position exists for the correct Traffic Channel of this terminal distribution, this Traffic Channel is abandoned, and search for the Traffic Channel that BS that specific switching target BS issued issues again, till capturing the Traffic Channel that BS that specific switching target BS issued issues, just switch to CDMA2000 1x network, cause seizure, check the Traffic Channel overlong time and cause may handoff failure situation, improved the reliability of switching greatly.
Step S310: terminal 400 continues to catch the Traffic Channel of other sub-districts, carries out the merging of eating dishes without rice or wine of signal.
After terminal 400 switches to CDMA2000 1x network, use the folding of eating dishes without rice or wine, continue the Traffic Channel of other sub-districts of seizure position existence, signal is merged the signal interference ratio that improves received signal.
Step S311: terminal 400 continues to use the HRPD network to carry out service communication.
If access network 301 is not suitable for the business of support terminal 400 according to the current CDMA2000 1x network environment of the pilot measurement information decision-making of CDMA2000 1x network, then terminal 400 continues to use the HRPD networks to carry out service communication.
Figure 4 shows that the signal flow that uses the present embodiment method to schematic diagram, shows as Fig. 4:
Terminal 400 is sent to access network 301 by the HRPD network with pilot measurement information, the pilot measurement information that the pilot measurement information here comprises the sub-district that belongs to BS201 100 of terminal 400 positions and belongs to the sub-district 104 of BS203; Access network 301 is according to received pilot measurement information, the purpose sub-district is switched as network at least one sub-district of choosing at least two BS subordinaties that pilot frequency intensity is bigger in the pilot measurement information, and choose certain sub-district of switching in the purpose sub-district as first-selected sub-district, at this, suppose that the sub-district 100 under the BS201 is first-selected sub-district, access network 301 switches the purpose cell information and other the CDMA2000 1x network information with this network, be included in the 1x network parameter message and be sent to terminal 400, and send 1x network traffic redirection message by the HRPD network to terminal 400, indicating terminal 400 switches to CDMA2000 1x Network; After terminal 400 correctly receives 1x network traffic redirection message, resolve message and know the network handover decisions--should switch to CDMA2000 1x network, and echo reply message, and, initiate the 1x network beginning to access network 301 and exhale; Access network 301 correctly receives after this 1x network beginning exhales, and returns the beginning and echoes and answer message, shows correct reception, and access network 301 sends the connection management business request information by A1 or A1p interface to MSC202 then; After MSC202 receives this request, a common beginning is used as in this request is exhaled processing, send the traffic channel assignments request message to access network 301, indication access network 301 is joined Traffic Channel for the beginning speechminute; After access network 301 receives this allocation request message, return traffic channel assignments to MSC202 and finish message.
Simultaneously, access network 301 sends the network handoff request to MSC202, and in handoff request, carry cell identification list, the pilot measurement information of each sub-district and the information such as sign of terminal 400 of switching purpose sub-district (sub-district 100 under the BS201 and the sub-district 104 under the BS203), general access network 301 is when encapsulation network handoff request, the cell ID that respectively switches the purpose cell identification list that makes is arranged to weak sequencing by strong according to pilot frequency intensity, be about to that access network 301 makes a strategic decision first-selected sub-district--sub-district 100 is first of cell identification list; MSC202 receives after this handoff request, according to cell identification list of carrying and pilot measurement information, obtain the BS (BS201, BS203) of sub-district ownership, be combined in the current network carrying situation of each switching cell that this MSC is known, purpose sub-district and first-selected sub-district are switched in decision-making for the second time, at this, suppose that the secondary decision-making of MSC202 is consistent with the decision-making of access network 301; MSC202 sends handoff request to the described BS--BS201 in first-selected sub-district, and carries the information such as sign of cell ID, pilot measurement information and the terminal 400 of sub-district 100, sub-district 104 in handoff request; After BS201 receives this handoff request,, select suitable transmission power, be terminal 400 distribution service channels according to pilot measurement information.
Simultaneously, BS201 is according to receiving sub-district 104 information of carrying in this handoff request, BS203 under sub-district 104 initiate the soft handover request by the A7 network interface, wherein in the soft handover request, and the pilot measurement information of the sign of carried terminal 400 and sub-district 104; After BS203 receives this soft handover request, by A3 signaling subchannel or A7 interface, send Traffic Channel connection request message to BS201, connect to be initiated as the A3 Traffic Channel that terminal 400 set up, being terminal 400 distribution service channels in sub-district 104, after BS201 correctly receives this user traffic channel connection request message, return connection request and correctly receive response message, and,, send forward frame to BS201 by the A3 interface; BS203 returns idle frame by the A3 interface after receiving the forward frame that BS201 sends, and carries BS203 and finish synchronous time necessary adjustment information with BS201 in the idle frame that returns at once; After as long as BS201 and BS203 are synchronous, BS203 regularly sends idle forward frame by the radio traffic channel of distributing for terminal 400 at once, so that terminal 400 can be according to this free time forward frame, catch the Traffic Channel that BS203 issues, returning soft handover by the A7 interface to BS201 then replys, indicate current operating in soft handover success, and be sent as the A3 Traffic Channel identification information that terminal 400 is distributed to BS201 by the A3 interface.
BS201 receives after the A3 Traffic Channel identification information that is distributed for terminal 400 of BS203 transmission, returning handoff request to MSC202 replys, and in response message, carry BS201 in the sub-district 100 and BS203 in the sub-district 104 traffic channel informations that distributed for terminal 400, make terminal 400 to carry out the Traffic Channel search, to catch according to the traffic channel information that is distributed, BS201 is regularly to being the Traffic Channel transmission forward direction idle frame that terminal 400 is distributed then, so that terminal 400S receives this idle frame, catch the Traffic Channel that BS201 issues; MSC202 simultaneously receives after this handoff request replys, and sends the network switching commands to access network 301, and indication access network 301 switches indication for issue network to terminal 400; Access network 301 issues the 1x network to terminal 400 and switches indication according to this network switching command, and indicating terminal 400 switches to CDMA2000 1x network; After terminal 400 correctly receives this 1x network switching indication, returning the indicating correct reception to access network 301 replys, and catching CDMA2000 1x network is the Traffic Channel that terminal issues, promptly BS201 in the sub-district 100 and BS203 in the sub-district 104 Traffic Channels that issue.
Simultaneously, access network 301 receive indicating correct that terminal 400 returns receive reply after, send to switch to MSC202 and notify, indicating terminal 400 carrying out network and switching.
After if terminal 400 captures the Traffic Channel that BS201 (or BS203) issues, send 1x network handoff completion message to BS201 (or BS203), indicating terminal 400 successful switch to this CDMA20001x network.At this, BS201 receives after the 1x network handoff completion message of user's transmission, sends network handover success notice to MSC202; BS203 sends a reverse frames to BS201 after the 1x network handoff completion message that receives user's transmission, and in reverse frames, carries this network and switch the information of finishing; After BS201 receives this reverse frames, send soft handover to MSC202 and finish message.
Embodiment 2:
Present embodiment switches to example with the network of network interconnection structure shown in Figure 2, is specifically described using the inventive method, and Fig. 5 is the schematic flow sheet of present embodiment method, shows as Fig. 5, and this method may further comprise the steps:
Step S501: terminal 400 reports pilot measurement information to the access network 301 of HRPD network 300.
Step S502: access network 301 is according to pilot measurement information, and whether decision-making needs to switch to CDMA2000 1x network, if desired, and execution in step S503, otherwise, execution in step S509.
Step S301, step S302 among above-mentioned two steps and the embodiment 1 are in like manner.
Step S503: the switching purpose sub-district of the CDMA2000 1x network that access network 301 decision-makings need switch to, and notify terminal 400 to switch to CDMA2000 1x network, and send handoff request to BS201 simultaneously, report and switch the purpose cell information.
The decision-making technique of describing among the method for access network 301 decision-makings switching purpose sub-district and first-selected sub-district and the step S302 among the embodiment 1 in like manner.
At this, access network 301 sends this handoff request by the form of encapsulation 1x idle message.
Step S504:BS201 receives and resolves handoff request, is terminal 400 distribution service channels, and initiates the soft handover request to BS203.
After BS201 receives the handoff request of access network 301 transmissions, resolve switching purpose cell ID, pilot measurement information and terminal 400 signs of wherein carrying, send the connection management request to MS202, under the management control of MSC202, BS201 is terminal 400 distribution service channels in sub-district 100.
Simultaneously, BS201 is according to the sub-district of carrying 104 information in the handoff request, know that sub-district 104 belongs to BS203, BS201 initiates the soft handover request to BS203, and carries information such as sub-district 104 signs, pilot measurement information and terminal 400 signs in the soft handover request.
Step S505:BS203 carries out operating in soft handover, and is returned as the traffic channel information that terminal 400 is distributed to BS201.
Step S306 among this step and the embodiment 1 in like manner.
Step S506:BS201 returns switching command to access network 301.
BS201 is after receiving the traffic channel information that distributes for terminal 400 that BS203 returns, send switching command by the A21 interface to the access network 301 of HRPD network, and in order, carry BS201 in sub-district 100, the pilot frequency information that in sub-district 104, distributes of BS203 for terminal 400, issue the switching indication with indication access network 301 to terminal 400, indicating terminal 400 beginning is according to pilot frequency information, catch BS201 in the sub-district 100 or BS203 in the sub-district 104 Traffic Channels that issue for terminal.
At this, BS201 sends this switching command by the mode of encapsulation 1x idle message to access network 301.
Step S507: terminal 400 is caught the Traffic Channel of BS201 or BS202 distribution, begins to be undertaken by the Traffic Channel of catching the transmitting-receiving of speech business data.
Described step S309 in this step and the embodiment of the invention 1 does not in like manner give unnecessary details at this.
In like manner, terminal 400 successes so far switch to CDMA2000 1x network 200 by HRPD network 300, can use CDMA2000 1x network to carry out service communication.
Step S508: terminal 400 continues to catch the Traffic Channel of other sub-districts, carries out the merging of eating dishes without rice or wine of signal.
Step S509: terminal 400 continues to use the HRPD network to carry out service communication.
Above-mentioned two steps respectively with embodiment 1 in step S310, step S311 in like manner.
Therefore, with embodiment 1 in like manner, owing to be not limited to one for the BS that changes earnestly under the purpose sub-district that switches to CDMA2000 1x network, promptly can switch to CDMA2000 1x network as long as make terminal capture the Traffic Channel that the position exists the arbitrary BS under the sub-district to issue, reduce the terminal seizure, checked the time delay of the Traffic Channel of CDMA2000 1x network allocation, strengthened reliability and switching efficiency that network switches.
Especially, network for the terminal that is in the BS intersection switches, since belong to each BS each sub-district signal all a little less than, in fact the probability of the signal of each BS of capture terminal is suitable, use the inventive method, because the BS that chooses under the purpose switching cell is not limited to one, as long as the Traffic Channel that the BS under the arbitrary purpose switching cell of capture terminal distributes all can switch to CDMA2000 1x, with respect to using art methods, efficient and reliability that network switches improve greatly.
Fig. 6 shows as Fig. 6 for using the signal flow graph of present embodiment method:
BS201 sends the network parameter Notifications of Changes by the A21 interface to the access network 301 of HPRD network, with the CDMA2000 1x network that the upgrades access network 301 records parameter of eating dishes without rice or wine, starts timer TA21ack; After access network 301 correctly receives this network parameter Notification of Changes, return notice and receive and to reply, BSA201 receives after this notice reception replys, and stops timer TA21ack.
Terminal 400 is sent to access network 301 by the HRPD network with pilot measurement information, and the pilot measurement information here comprises the sub-district that belongs to BS201 100 that terminal 400 positions exist, and the pilot measurement information that belongs to the sub-district 104 of BS203; Access network 301 is according to received pilot measurement information, the purpose sub-district is switched as network at least one sub-district of choosing at least two BS subordinaties that pilot frequency intensity is bigger in the pilot measurement information, and in all switching purpose sub-districts, choose certain sub-district as first-selected sub-district, at this, suppose that the sub-district 100 under the BS201 is first-selected sub-district; Access network 301 switches purpose cell information and other the CDMA2000 1x network information with this network and is included in the 1x network parameter message and is sent to terminal 400, and send 1x network traffic redirection message by the HRPD network to terminal 400, indicating terminal 400 switches to CDMA2000 1x Network; After terminal 400 correctly receives 1x network traffic redirection message, resolve message and know the network handover decisions--should switch to CDMA2000 1x network, and echo reply message, and, initiate the 1x network beginning to access network 301 and exhale; Access network 301 correctly receives after this 1x network beginning exhales, return the beginning concord and answer message, show correct reception, then, after access network 301 was exhaled according to the 1x network beginning that receives terminal 400 transmissions, encapsulation 1x idle message, beginning is exhaled, switch the cell identification list of purpose sub-district, each pilot measurement information is encapsulated in the 1x idle message, send this 1x idle message by the BS--BS201 of A21 interface under first-selected sub-district, initiating the beginning exhales, to switch to BS201 request network, start timer TA21ack simultaneously, general access network 301 is when encapsulation 1x idle message, and the cell ID that respectively switches the purpose cell identification list that makes is arranged to weak sequencing by strong according to pilot frequency intensity, be about to that access network 301 makes a strategic decision first-selected sub-district--sub-district 100 is first of cell identification list; BS201 receives after this 1x idle message that access network 301 sends, and returns the reception response message, accepts network 301 and receives after this replys, and stops timer TA21ack.
Simultaneously, after BS201 returns and receives response message, send the connection management business request information to the MSC202 at its place, with request MSC202 execution its beginning is exhaled connection management control, and start timer T303; After MSC202 receives this connection management service request,, carry out the connection management control strategy according to request, send the traffic channel assignments indication to BS201, indication BS201 distributes radio traffic channel to terminal 400, and stops timer T303, starts timer T10 simultaneously; BS201 is terminal 400 distribution service channels in sub-district 100 according to indication.
Simultaneously, the switching purpose cell information that carries in the 1x idle message that BS201 begins to send according to access network 301, the purpose sub-district (being BS203 subordinate's sub-district 104 at this) that need switch to is known in parsing, sends the soft handover request by the A7 interface to BS203, initiates soft handover; BS203 according to the soft handover request that is received after, by A3 signaling subchannel or A7 interface, send Traffic Channel connection request message to BS201, connect to be initiated as the A3 Traffic Channel that terminal 400 set up, being terminal 400 distribution service channels in sub-district 104, after BS201 correctly receives this user traffic channel connection request message, return connection request according to message and correctly receive response message, and,, send forward frame to BS201 by the A3 interface; BS203 returns reverse idle frame by the A3 interface after receiving the forward frame that BS201 sends, and carries BS203 and finish synchronous time necessary adjustment information with BS201 in the reverse idle frame that returns at once; After as long as BS201 and BS203 are synchronous, BS203 104 be the radio traffic channel of terminal 400 distribution by this in the sub-district at once, send idle forward frame, so that terminal 400 can be according to this forward direction idle frame, catch the Traffic Channel that BS203 issues, then, BS203 returns soft handover by the A7 interface to BS201 and replys, indicate current operating in soft handover success, and be sent as the A3 Traffic Channel identification information that terminal 400 is distributed to BS201 by the A3 interface; BS201 receives after this soft handover replys, and 100 be that the radio traffic channel that terminal 400 is distributed sends idle forward frame by this in the sub-district so that terminal 400 can catch the Traffic Channel of BS201 distribution according to this forward direction idle frame.
Simultaneously, BS202 receives after the A3 Traffic Channel identification information that is distributed for terminal 400 of BS203 transmission, establishment is carried BS201 in the sub-district 100 and the 1x network switch indicating information of BS 104 pilot frequency distribution information of distributing for terminal 400 in the sub-district, and 1x network switch indicating information is encapsulated in the 1x idle message, send to access network 301 by the A21 interface, carry out the network handover operation with indication access network 301 notice terminals 400.
After if terminal 400 captures the Traffic Channel that BS201 (or BS203) issues, send 1x network handoff completion message to BS201 (or BS203), indicating terminal 400 successful switch to this CDMA2000x network.At this, if BS201 receives the 1x network handoff completion message that the user sends, then return BS and confirm response message to terminal 400, confirm to accept; BS203 then returns BS to terminal 400 and confirms response message, and send a reverse frames to BS201 after the 1x network handoff completion message that receives user's transmission, and in reverse frames, carries this network and switch the information of finishing; After BS201 receives this reverse frames, send soft handover to MSC202 and finish message.
Embodiment 3:
Fig. 7 is the structural representation of the described communication system of present embodiment, show as Fig. 7, this communication system comprises: CDMA2000 1x network 205, HRPD network 303 and in the terminal 400 of HRPD network 303, wherein CDMA2000 1x network 205 comprises: the BS201 and the BS203 of MSC202 and this MSC control that is connected with this MSC, and is subjected to respectively; HRPD network 303 comprises: the group data service node 304 that the gateway service function is provided; Be connected with group data service node 304, be used to transmit the packet control unit 305 of the message between wireless subsystem and the group data service node 304; Be connected with packet control unit Unit 305, be subjected to packet control unit 305 controls, terminal 400 is linked into the access network device 302 of HRPD network; Terminal 400 positions exist sub-district 100, the sub-district 104 of BS201, BS203 respectively, and BS201 and BS203 all belong to CDMA2000 1x network.
The basic syndeton of this communication system is identical with the communication system of prior art shown in Figure 1, and different is:
At first, access network device 302 is different with access network device 301 shown in Figure 1, the pilot measurement information of each sub-district (comprising sub-district 100 and sub-district 104) under the CDMA20001x network of the terminal position that access network device 302 reports according to 400 at terminal, perhaps, pilot measurement information according to the HRPD network of the terminal position of terminal to report, estimate the sub-district of this position existing CDMA2000 1x network, and the pilot measurement information of each sub-district, judge whether current C DMA2000 1x network is fit to the current communication service of terminal more, if, then further according to pilot measurement information, choose at least one sub-district under at least two higher BS of signal strength signal intensity as the switching purpose sub-district that switches to CDMA2000 1x network; And, in switching the purpose sub-district, select certain sub-district as first-selected sub-district.
In situation shown in Figure 7, obviously terminal 400 is in the sub-district 100 under the BS201 and the cell boarder of the sub-district 104 under the BS203, the intensity of the signal of two sub-districts all a little less than, and the probability of signal that terminal 400 captures two sub-districts is suitable, in this case, access network device 302 is suitable according to the signal strength signal intensity of sub-district 100 that comprises in the pilot measurement information and sub-district 104, chooses sub-district 100 and sub-district 104 as the switching purpose sub-district that switches to CDMA2000 1x network.Then, access network device 302 is to being connected by A1 or A1p interface with it, the MSC204 that belongs to CDMA2000 1x network sends the network handoff request, and in the network handoff request, carry and switch purpose sub-district--cell ID, the pilot measurement information of sub-district 100 and sub-district 104, initiate network and switch.
Secondly, MSC204 is different with MSC202 shown in Figure 1, MSC is after the network handoff request that receives the access network device transmission, switching purpose cell ID and pilot measurement information that analysis request is carried, take the current service bearer situation of respectively switching the purpose sub-district into consideration, in former switching purpose sub-district, secondary is chosen decision-making and is switched purpose sub-district and first-selected sub-district.In the present embodiment, suppose that the service bearer situation of current area 100 and sub-district 104 all can allow for the terminal distribution Traffic Channel, i.e. MSC204 secondary decision-making is identical with the decision-making of access network 301.MSC204 indicates BS--BS201 under the first-selected sub-district, BS--BS203 under other switching purpose sub-district (sub-district 104), initiate the soft handover between BS, and after finishing soft handover, be that BS201 and BS203 are terminal 400 and have distributed after the Traffic Channel, return the network switching command by A1 or A1p signaling interface to access network device 302, and in this network switching command, carry the Traffic Channel pilot frequency information that CDMA2000 1x network distributes for terminal 400 in each switches purpose sub-district, indicating terminal 400 beginnings are caught the Traffic Channel of CDMA2000 1x network allocation according to this Traffic Channel pilot frequency information.
In the present embodiment, terminal 400 captures BS201 in the sub-district 100, and perhaps BS203 104 is Traffic Channel arbitrary of terminal distribution in the sub-district, promptly can switch to CDMA2000 1x network.
By on can see, owing to make the access network device of HRPD network when decision-making switches to the switching purpose sub-district of CDMA2000 1x network, make that switching the purpose sub-district is not limited to only belong to a BS, when being in cell boarder under a plurality of BS, can choose sub-district under two or more BS as switching the purpose sub-district for terminal; Simultaneously, make the MSC that is connected with the access network device of HRPD network in the CDMA2000 1x network, support to receive the switching purpose cell information that carries according to handoff request, indicate BS under each sub-district to finish soft handover between BS, make each BS that switches the purpose sub-district all in switching the purpose sub-district, be the terminal distribution Traffic Channel, as long as the Traffic Channel that the arbitrary BS that makes terminal capture its position issues in arbitrary sub-district, promptly can switch to CDMA2000 1x network, reduce the time delay of capture terminal Traffic Channel, improved the reliability that network switches.
Embodiment 4:
Present embodiment is an example at the another kind of interconnection mode of the network of CDMA2000 1x network and HRPD, in the present embodiment, the access network device of HRPD network closes on by A21 signaling interface and HRPD network, base station controller among the BS in the CDMA2000 1x network (Base Station Controler, be called for short BSC) be connected, Fig. 8 is the structural representation of the described communication system of present embodiment, as shown, the BSC208 among the BS207 in the access device 302 in the HRPD network 303 and the CDMA2000 1x network 205 is connected.
Because access network device 302 directly is connected with BS by the A21 signaling interface, so access network interface 302 direct base stations under the first-selected sub-district 100 of switching the purpose sub-district, the network handoff request of initiating, be sent to base station under the described first-selected sub-district 100 by the A21 interface, after BSC208 receives this handoff request, resolve the switching purpose cell ID that handoff request is carried, and pilot measurement information, and according to the current service bearer situation in switching purpose sub-district that belongs in this BS, in the former switching purpose sub-district that belongs in this BS, secondary is chosen switching purpose sub-district and the first-selected sub-district that decision-making belongs to this BS.In the present embodiment, suppose that the service bearer situation of current area 100 can allow for the terminal distribution Traffic Channel, i.e. the secondary of BSC208 decision-making is identical with the former decision-making of access network 302.BSC208 is to affiliated MSC202 request connection management request, under the control of MSC202, be terminal 400 distribution service channels, and BSC208 other BS (being specially the BSC210 among the BS209 in the present embodiment) under switching the purpose sub-district initiate soft handover, BSC210 is according to this soft handover request, in like manner can also switch the secondary trade-off decision of purpose sub-district, the decision-making technique of its decision-making technique and BSC208 in like manner, at this, suppose that the secondary result of decision does not change the decision-making of access network device 302, both switch the purpose sub-district and still be sub-district 104, BSC210 is terminal 400 distribution service channels in sub-district 104, and to BS208 reporting channel pilot frequency distribution information, and BSC208 is after receiving the traffic channel information that BSC210 is terminal 400 distribution, to access network device 302 report CDMA2000 1x networks is the pilot frequency distribution information of the Traffic Channel of terminal 400 distribution, issue to terminal 400 by access network device 302, make the pilot frequency distribution information of terminal 400 according to this Traffic Channel, as long as capture BSC208 in the sub-district 100, perhaps BSC210 104 traffic channel signal that issue for terminal in the sub-district is arbitrary, promptly can switch to CDMA2000 1x network 205, begin to be undertaken the transmitting-receiving of speech business data by the Traffic Channel of catching.
By on can see, owing to make the access network device of HRPD network when decision-making switches to the switching purpose sub-district of CDMA2000 1x network, make that switching the purpose sub-district is not limited to only belong to a BS, when being in cell boarder under a plurality of BS, can choose sub-district under two or more BS as switching the purpose sub-district for terminal; Simultaneously, the BS that is connected with the access network device of HRPD network in the CDMA2000 1x network, support to receive the switching purpose cell information that carries according to handoff request, other BS under switching purpose sub-district initiate soft handovers, make each BS that switches the purpose sub-district all in switching the purpose sub-district, be the terminal distribution Traffic Channel, as long as the Traffic Channel that the arbitrary BS that makes terminal capture its position issues in arbitrary sub-district, promptly can switch to CDMA2000 1x network, reduce the time delay of capture terminal Traffic Channel, improved the reliability that network switches.
More than a kind of method for switching network provided by the present invention and communications network system are described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (7)
1. method for switching network, described network switch and are meant that terminal switches to the CDMA2000lx network by high speed data network, comprising:
High speed data network sends the network handoff request to the CDMA2000lx network, and reports the cell ID of purpose sub-district of base station subordinate in the CDMA2000lx network and the pilot measurement information of described purpose sub-district to the CDMA2000lx network; The number of described base station is at least two;
High speed data network is selected first-selected sub-district from described purpose sub-district, it is the terminal distribution Traffic Channel that the CDMA2000lx network is notified the base station under the described first-selected sub-district, and by the base station under soft handover order indication other purpose sub-districts except that described first-selected sub-district is the terminal distribution Traffic Channel, after base station under described other purpose sub-districts was the terminal distribution Traffic Channel, the base station was returned as the traffic channel information of terminal distribution under described first-selected sub-district;
CDMA2000lx network indication high speed data network issues switching command to terminal, and described each base station of notice terminal traffic channel information that is terminal distribution;
After terminal is accepted described switching command,, catch the Traffic Channel of arbitrary described base station in arbitrary purpose cell allocation according to described traffic channel information.
2. method for switching network according to claim 1 is characterized in that, the purpose sub-district of described purpose CDMA2000lx network is chosen acquisition according to the CDMA2000lx network in the pilot measurement information of terminal position by high speed data network.
3. method for switching network according to claim 2 is characterized in that high speed data network is obtained and reported to described pilot measurement information by the terminal measurement.
4. method for switching network according to claim 2 is characterized in that, obtaining of described pilot measurement information specifically comprises:
The terminal to report high speed data network is in the pilot measurement information of terminal position;
High speed data network is according to the pilot measurement information of described high speed data network, and the networking information of CDMA2000lx network, and the pilot measurement information of the CDMA2000lx network of terminal position is obtained in estimation.
5. method for switching network according to claim 1, it is characterized in that, high speed data network is connected with the base station of CDMA2000lx network, and high speed data network specifically is that the base station under described first-selected sub-district sends described handoff request, and reports described pilot measurement information.
6. method for switching network according to claim 1, it is characterized in that, high speed data network is connected with the mobile switching centre of CDMA2000lx network, and high speed data network specifically is to send described network handoff request to described mobile switching centre, and reports described pilot measurement information;
After described each base station is respectively the terminal distribution Traffic Channel, CDMA2000lx network indication high speed data network is before terminal issues switching command, further, base station under the described first-selected sub-district is the traffic channel information that terminal is distributed with described each base station, reports to described mobile switching centre;
Described mobile switching centre indication high speed data network issues switching command to terminal, and the described traffic channel information of notice terminal.
7. according to claim 5 or 6 described method for switching network, it is characterized in that, base station under described mobile switching centre or the described first-selected sub-district receives after the pilot measurement information of the cell ID of purpose sub-district in the CDMA2000lx network and described purpose sub-district, each base station is respectively before the terminal distribution Traffic Channel, further comprises:
Base station under described mobile switching centre or the described first-selected sub-district is according to the service bearer situation of the purpose sub-district in the described CDMA2000lx network, from described purpose sub-district, further screen new purpose sub-district, and in described new purpose sub-district, redefine first-selected sub-district.
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| KR100975740B1 (en) * | 2007-03-23 | 2010-08-12 | 삼성전자주식회사 | Mehtod and apparatus for handover in a heterogeneous wireless communication system |
| CN101478795B (en) | 2008-04-30 | 2011-07-06 | 华为技术有限公司 | Method, communication system for resource processing and mobile management network element |
| CN101291535B (en) * | 2008-06-11 | 2012-09-05 | 中兴通讯股份有限公司 | Method and system for terminal to switch among different networks |
| US9655009B2 (en) | 2009-09-18 | 2017-05-16 | Futurewei Technologies, Inc. | System and method for inter-femto access point handoffs |
| CN101778452B (en) * | 2010-01-13 | 2013-01-09 | 华为技术有限公司 | Method and device for selecting network |
| CN102111904B (en) * | 2011-02-28 | 2015-09-16 | 中兴通讯股份有限公司 | The transmission method of cdma base station system and message thereof |
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| EP1448010A1 (en) * | 2003-02-15 | 2004-08-18 | Alcatel | A method of performing a handover or reselection procedure |
| CN1802002A (en) * | 2004-12-31 | 2006-07-12 | 华为技术有限公司 | Multi-cell fast switching method |
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| CN1802002A (en) * | 2004-12-31 | 2006-07-12 | 华为技术有限公司 | Multi-cell fast switching method |
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