JP3442320B2 - Communication system switching radio terminal and communication system switching method - Google Patents

Communication system switching radio terminal and communication system switching method

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Publication number
JP3442320B2
JP3442320B2 JP22733199A JP22733199A JP3442320B2 JP 3442320 B2 JP3442320 B2 JP 3442320B2 JP 22733199 A JP22733199 A JP 22733199A JP 22733199 A JP22733199 A JP 22733199A JP 3442320 B2 JP3442320 B2 JP 3442320B2
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Japan
Prior art keywords
communication
mobile
system
base station
communication system
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JP22733199A
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Japanese (ja)
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JP2001054168A (en
Inventor
一浩 上原
周治 久保田
崇 庄納
宏礼 芝
Original Assignee
日本電信電話株式会社
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Priority to JP22733199A priority Critical patent/JP3442320B2/en
Publication of JP2001054168A publication Critical patent/JP2001054168A/en
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Publication of JP3442320B2 publication Critical patent/JP3442320B2/en
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Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention
Different types such as HS, CDMA-ONE, etc.
Automatically switch between multiple mobile communication services during a call
Communication method switching wireless terminal and communication method
The switching method. [0002] PDS, PHS, CDMA-ONE, etc.
Various mobile communication services are independent of each other.
Are provided by different operators
Service communication methods and communication protocols are not the same. Therefore, the mobile communication service is used.
The wireless terminal used by the user for each service used
The models are different. Each wireless terminal is generally
Communication method and communication protocol for one mobile communication service
Conforms to Two types of PDS and PHS
There are also wireless terminals that can support mobile communication services.
This wireless terminal is one of two types of mobile communication services.
Two sets of Her that are compatible with these communication methods and protocols
Built-in hardware. Also, by switching the switch
Switch communication method and communication protocol.
wear. [0004] By the way, at present, 1
Users are satisfied by using only one mobile communication service
It is not always possible to obtain communication quality. For example, base
When communicating at a distance from the ground station, or with the base station
If there is an obstacle between
The line is disconnected and the call quality is degraded.
Become. Also consider cases where the user feels the communication fee is high.
available. [0005] Even now, various telecommunications carriers are using PDS, P
Provides mobile communication services such as HS and CDMA-ONE
Because we offer, movement to use depending on the environment at that time
If you can switch between physical communication services,
Improve user satisfaction by selecting services
be able to. However, various mobile communication services
To use the service, each user has multiple
You must have a communication terminal. PDS and P
Wireless terminal compatible with two types of HS mobile communication services
The end is not practical because it is large and expensive.
Yes. Furthermore, it is necessary to switch the switch at the user's discretion.
Yes, turn off the mobile communication service used during the call.
Since switching is impossible, the switching operation is very troublesome.
I'm sorry. The present invention relates to PDS, PHS, CDMA-O.
Multiple mobile communications with different types such as NE
Communication method can be switched automatically during a call
To provide a replacement wireless terminal and a communication method switching method
And [0007] A first aspect of the present invention is software.
Multiple mobile objects of different types by switching
Communication that enables wireless communication with the wireless base station of the communication system
It is a method switching wireless terminal, and the communication method and frequency are mutually
Multiples belonging to different mobile communication systems
Airborne for sending and receiving wireless signals with other wireless base stations
A multimode transmission / reception means comprising a wire and a feeder line;
Can be connected to multi-mode transmission / reception means and changes necessary for communication
Programmable functions such as demodulation and filtering
Programmable device and programmable device
To control the radio base station of multiple mobile communication systems
Quality signal reception controller that receives these radio signals almost simultaneously
And each wireless base under the control of the quality signal reception control means.
Propagation environment detected based on signal received from ground station
Characteristic data and systems of each mobile communication system
Each mobile communication system based on characteristic data
Calculates communication quality QoS corresponding to multiple mobile communications
The communication quality QoS of the system to the wireless base station in communication
Quality information transmission means to be transmitted and the transfer used for communication.
It is necessary to switch the mobile communication system to another system.
The communication system compatible with the switching destination mobile communication system.
Control of the software module that realizes the communication function
Add module to control programmable devices
Software that realizes additional control means and communication functions that are no longer needed
Wearable module control of the programmable device
Module release control means to release from
Features. Multi-mode transmission / reception means can be used for communication methods and peripherals.
Transmission of radio signals for various mobile communication systems with different wave numbers
It is equipped with an aerial line and a feeder line corresponding to reception. example
(Reference 1: A. Strugatsky, CHWalter “Multimode
Multiband Antenna ”, Tactical Communications Confer
ence, Vol.1, pp.281-295,1992)
Can be used in a wide frequency band.
An antenna can be realized. Such a multi-band antenna
Can be used for multi-mode transmission / reception means. A programmable device is a DSP (Digit
al Signal Processor) and FPGA (Field Programmable
Modulation / demodulation and filters required for communication such as (Gate Array)
Any hardware that can be programmed with various functions
The For example, (Reference 2: J. Mitola, “The Software Radio
Architecture ”, IEEE Comm. Mag. Vol.33, No5, pp.26-
38,1995) by adopting the technology shown in
None using programmable devices such as P and FPGA
Realize the main functions of wire communication equipment in software
Is possible. That is, the communication system switching radio terminal of claim 1
Then, software to control programmable devices
Various communication methods (PDC, PHS, etc.) by changing
You can communicate with. Quality signal reception control means
Control multiple programmable devices by controlling programmable devices
Receive radio signals from radio base stations of the communications system almost simultaneously.
I believe. The quality information sending means includes the quality signal receiving system.
Based on the signal received from each radio base station
Characteristic data related to the propagation environment detected
Based on system-specific characteristic data of mobile communication systems
Communication quality QoS corresponding to each mobile communication system
(Quality of Service) is calculated and multiple mobile communication systems are calculated.
System communication quality QoS for wireless base stations in communication
Send it out. Based on this communication quality QoS information,
The ground station can provide optimal mobile communication services for communication.
Communication system can be identified. For example, currently used for communication
Mobile communication services that are different from
The communication system provided has higher communication quality (for example, a terminal
(If the reception level is high)
It is better to use another high-quality communication system. The module addition control means is used for communication.
Switch a mobile communication system to another system
When the need arises, it can be
Software module that implements the appropriate communication function
Is added to the control of the programmable device. This
With the addition of, what is the system currently used for communication
Added functions necessary to communicate with another system
Is done. The function is added by the module addition control means.
When added, the communication mode switching wireless terminal of claim 1
Between the mobile communication system before switching and the switching destination
Can communicate with other mobile communication systems at substantially the same time
Become capable. Therefore, it is useful for communication without interrupting the call.
The mobile communication system to be used can be switched instantaneously
wear. Communication mode switching wireless terminals used for communication
When switching mobile communication systems, mobile communication before switching
The communication function corresponding to the system becomes unnecessary. Therefore, the mode
Joule release control means realizes communication functions that are no longer needed
A software module for the programmable device
Free from control of the service. Claim 2 is different from each other
Wireless communication with multiple base stations of mobile communication systems
A mobile communication system used for communication by a wireless terminal capable of communication
Communication method switching method for switching
In the wireless terminal, a plurality of different types of mobile units that can be used
Receiving from each of a plurality of radio base stations belonging to the communication system.
Each radio base is based on multiple received signals received
Measure propagation environment data related to the propagation environment between stations,
In the wireless terminal, the propagation environment data and corresponding to it
System characteristic data specific to the mobile communication system
Based on the communication quality QoS of each mobile communication system
Calculate and use the wireless terminal for communication in the wireless terminal
A plurality of mobile communications to the first radio base station
Report communication quality QoS for each of the systems,
The first radio base station reports from the radio terminal.
Based on the communication quality QoS of each mobile communication system
Ranking communication quality QoS of each mobile communication system
In the first radio base station, each mobile communication system
Mobile communication system to which the station belongs
To the first mobile gateway exchange of the system
At the Kanmon Exchange, the communication quality reported from the base station
Switching destination mobile communication system in the order according to the QoS order
The system belonging to the switching target mobile communication system.
For the mobile gateway exchange of 2
Between the second radio base station belonging to the system and the radio terminal
The first mobile gateway exchange will ask
As a result of the inquiry, the second radio base station and the radio
When connection with a terminal is possible, the second radio base station
On the other hand, mobile communication system by inter-system handover
It is characterized in that it is required to switch the system. According to a second aspect of the present invention, the wireless terminal transmits each mobile communication system.
Used to measure propagation environment data on the system
Multiple radio base stations belonging to a possible mobile communication system
Each receive a signal. In addition, the wireless terminal
The communication quality QoS of the communication system is set as the propagation environment data.
And the corresponding system of the corresponding mobile communication system
Calculation based on characteristic data. And the wireless terminal
The end is connected to the first radio base station that it uses for communication.
Communication for each of the plurality of mobile communication systems.
Report quality of service QoS. The first radio that has received this communication quality QoS
At the base station, the reported communication product of each mobile communication system
Ranks their quality of communication QoS based on quality of QoS
Of the mobile communication system to which the station belongs.
Report to the first mobile gateway exchange. In other words, multiple Qo
By comparison of S, at least wireless terminals are currently used for communication
Higher quality than the communication quality of mobile communication systems
There are other mobile communication systems that can provide
Whether or not to do so can be identified. In the first mobile gateway exchange, the base station
In order according to the reported communication quality QoS ranking,
Identify the replacement mobile communication system. Usually communication products
Select the mobile communication system with the highest quality of service as the switching destination.
You can choose. However, the mobile communication system of the selected switching destination
In some cases, there is no channel available in the system. Therefore, the first mobile gateway switching center is the switching destination.
For the second mobile gateway exchange belonging to the mobile communication system
The second radio belonging to the switching destination mobile communication system
An inquiry is made as to whether or not the base station and the wireless terminal can be connected. This
As a result of the inquiry, the second wireless base station and the wireless terminal
If a connection is possible, the system is connected to the second radio base station.
Switching between mobile communication systems by inter-system handover
Request. With such a procedure, the intersystem hand
Over can be started. That is, the wireless terminal
Communication quality of the mobile communication system currently used for communication
Other mobile communications that can provide higher quality services
If a system exists, a good quality mobile communication system
Inter-system handover control for switching to
Do. A third aspect of the present invention is a communication system switching method according to the second aspect.
In the first radio base station, the mobile station to which it belongs is transferred.
About the communication quality QoS of the mobile communication system,
Communication products received considering the system characteristic data to be retained
It is characterized by modifying quality QoS. If wireless end
Even if the communication quality detected by the terminal is good, the base station
Device resources (available memory, CPU processing
If there is not enough remaining capacity, the actual communication quality
Then it can get worse. In claim 3, the first radio base station holds
Considering system characteristic data
Since quality QoS is modified, inter-system handover
It is possible to more appropriately determine whether or not to do so. Claim 4
3. The communication system switching method according to claim 2, wherein the wireless terminal
Reception level, multipath delay characteristics, bit error rate,
At least one of frame error rate and packet error rate
Use as propagation environment data to calculate communication quality QoS
It is characterized by doing. According to a fifth aspect of the present invention, there is provided a communication method switching method according to the second aspect.
In this case, the wireless terminal has a transmission speed and security characteristics.
Performance, communication charges, equipment resources and power consumption
One is used as the system characteristic data and the communication quality Q
It is characterized by calculating oS. Claim 6 claims
3, the first radio base station
But less channel capacity, equipment resources and power consumption
One of them is the system characteristic data held by the local station.
And the communication quality QoS is corrected.
The According to a seventh aspect of the present invention, there is provided a communication method switching method according to the second aspect.
Wherein the first mobile gateway exchange is the second radio
Mobile communication by inter-system handover to base station
The first radio base when the switch of the communication system is requested
In a state where communication between the station and the wireless terminal is continued,
The communication with the communication partner station is controlled by the first mobile gateway exchange.
Connect the connected line through the second mobile gateway exchange.
The second radio base station is connected to the second radio base station.
And secure a switching destination wireless communication line between the wireless terminal and the wireless terminal,
After the switching destination wireless communication line is secured, the wireless terminal
Switch the mobile communication system that the end uses for communication.
The second mobile gateway exchange is the first mobile gateway exchange
Connection between the first radio base station and the radio terminal
Make a request to release and respond to this request
The first mobile gateway exchange is connected to the first radio base station and the first radio base station.
The connection with the wireless terminal is released. In claim 7, the wireless terminal and the communication partner station
Mobile communication before switching after two lines are connected in parallel
The system line is disconnected. For this reason, mobile communication systems
It is possible to prevent the call from being interrupted due to the switching of the stem. BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an embodiment of the communication method switching method.
Description will be given with reference to FIG. This form is included in all claims.
Correspond. FIG. 1 is a block diagram showing the configuration of the radio terminal of this embodiment.
FIG. A communication system switching wireless terminal according to claim 1
The configuration of an integrated wireless terminal is shown in FIG. Figure 2
It is a block diagram which shows the structural example of a communication system. Figure 3
Indicates the inter-system handover control sequence (1)
It is a chart. Figure 4 shows the inter-system handover system.
It is a flowchart which shows a control sequence (2). FIG. 5 shows a process in which the mobile terminal obtains QoS.
It is a flowchart. Figure 6 shows the mobile terminal QoS calculation.
It is a block diagram which shows a process. Fig. 7 shows the base station in communication
It is a flowchart which shows the process which corrects QoS. Figure
8 is a block showing a process in which the communicating base station corrects QoS.
FIG. In this form, the multimode of claim 1
Transmission / reception means, programmable device, quality signal reception system
Control means, quality information sending means, module addition control means,
Each module release control means
Receiving unit 10, programmable processing unit 20,
Communication quality detection program 36, system switching program
35, module addition program 37 and module solution
The release program 38 is embodied. According to a second aspect of the present invention, there is provided the wireless terminal, the first wireless base.
Ground station, first mobile gateway exchange, second mobile gateway exchange
And the second radio base station are respectively mobile station MS and base station B
S-A, mobile gateway exchange MGS-A, mobile gateway exchange M
Corresponds to GS-B and base station BS-B. None shown in FIG.
The line terminal includes a multimode transmission / reception unit 10, a program
Mable processing unit 20, display unit 31, operation baud
32, voice processing unit 33, communication control unit 3
4, system switching program 35, communication quality detection program
Ram 36, module addition program 37, module
Release program 38 and software module live
Rari 39 is provided. In addition, the multi-mode transmission / reception unit 10 includes
Is the multiband antenna 11, feed line 12, high frequency for reception
A wave amplifier 13 and a transmission power amplifier 14 are provided.
The The multiband antenna 11 and the feed line 12 are wideband
Compatible with various frequency bands and various wireless communication modes
The For this reason, the multi-mode transmission / reception unit 1
0 is various transfers such as PDC, PHS, CDMA-ONE.
Send and receive radio signals to and from each of the mobile communication services
Is possible. Multi-mode transceiver unit 10
The programmable processing unit 20 connected to the
P21 and FPGA 22 are incorporated. This multi model
The command transmission / reception unit 10 has various functions (variables necessary for communication).
Demodulator, synthesizer, voice codec, communication protocol
Pro) that incorporates DSP21 and FPGA22
Hardware that can be flexibly realized by gram
It is. The display unit 31 has a destination telephone number, etc.
It is a display device for displaying the character information. Operation bow
32 is a numeric key used to enter the telephone number of the other party.
Is an input device including Audio processing unit 33
The microphone that inputs the transmitted sound and the received sound
An output speaker is provided. Communication control unit 34
Is a control device with a built-in microcomputer.
Thus, the entire wireless terminal is controlled. The system switching programs 35 are different from each other.
A plurality of communication systems providing mobile communication services
Used when performing handover control between programs
And is executed by the communication control unit 34. Through
The communication quality detection program 36 is used for hands between communication systems.
Communication quality Qo for each communication system during over control
S is a program for detecting S and a communication control unit.
Is executed by the computer 34. The module addition program 37 is
A communication system that provides a mobile communication service different from
The functions required when communicating with the
To be added to the network 20 and the communication control unit 34.
The communication control unit 34
Is executed. The actual function is the software to add
Implemented by module 40. The module release program 38 is not
Unnecessary after switching the communication system with which line terminals communicate
Programmer functions corresponding to the communication system before switching
Solution processing unit 20 and communication control unit 34
Is a program that performs control to release
Performed by the knit 34. Software module
The library 39 includes various mobile communication services.
Many with programs and data associated with each
A number of software modules 40 are held. One software module 40 can be
Grammable processing unit 20 and communication control unit 34
To one mobile communication service.
Corresponding communication can be performed. In this form, at the same time
Program two software modules 40
Embedded in the management unit 20 and the communication control unit 34,
Simultaneous wireless communication with two types of communication systems
You can. Mobile station MS (Mobile Station) shown in FIG.
As the wireless terminal shown in FIG. Figure
2, base station BS (Base Station) -A and base station
Provides mobile communication services different from BS-B
Belongs to a communication system. For example, base station BS-A
Provides PDS services and base station BS-B
It can be assumed that the service is provided. In addition, the mobile gateway exchange MGS (Mobile Gat
eway Switch) -A is the same communication system as the base station BS-A
Belonging to The mobile gateway exchange MGS-A has a base
A number of base stations belonging to the same communication system as the station BS-A
It is connected. Similarly, the mobile gateway exchange MGS-B
It belongs to the same communication system as the base station BS-B. Move
The gateway exchange MGS-B has the same communication as the base station BS-B.
A number of base stations belonging to the system are connected. The mobile gateway exchange MGS-A and mobile
The gateway exchange MGS-B
Gateway Interchange System MISGS (Mobile Inter-System Gateway
Switch). Furthermore, between mobile communication systems
The gateway exchange MISGS has a fixed network connected to a fixed telephone.
A network 53 is connected. Here, in FIG.
Mobile station MS uses mobile communication service (A)
Assume a state in which a telephone call is made with the communication partner station 51 of the landline
The That is, the radio between the mobile station MS and the base station BS-A
The mobile station MS is connected to the base station BS-A, the mobile
Gate exchange MGS-A, gateway exchange M between mobile communication systems
Via ISGS, fixed network 53, subscriber line 52
Are connected to the communication partner station 51. In the example of FIG. 2, the mobile station MS is in communication
Another mobile communication service different from the mobile communication service (A)
The mobile station is also located in the wireless zone
MS switches mobile communication service to use and communicates
Is possible. The mobile station M in FIG.
When used as S, handover control between systems
Mobile communication support automatically during a call.
Service can be switched. This inter-system hand
Refer to Figs. 3 and 4 for the control sequence of passover.
This will be explained. In this example, the mobile communication service shown in FIG.
-Mobile communication during a call using Service (A)
Assuming the case of handover to service (B)
The The mobile station MS obtains a profit in step S10 of FIG.
Total communication quality QoS of all available services
Calculate. Specifically, the process shown in FIG. 5 is performed. this is,
The processing of the communication quality detection program 36 in FIG.
It means that the knit 34 executes. Step of FIG.
In S70, all available (receivable) services
Receive radio signals from each communication system (base station)
The In step S71, based on the received radio signal
The reception level and bit error of each communication system
Measure the rate. In step S72, the received radio signal
Communication system that transmits it based on frequency etc.
Type (PDC, PHS, etc.). Step S
73, system specifics for each communication system.
Existence of characteristic data (transmission rate, power consumption, communication charges, etc.
)). In step S74, each characteristic data
Enter the data of the weighting factor (w (1) to w (n) in Fig. 6)
To do. Various systems are provided on the communication control unit 34.
System-specific characteristic data and the weighting factor data
Data is held in advance. In step S75, the calculation as shown in FIG.
The communication quality QoS for each communication system is obtained by arithmetic processing.
The Communication quality QoS for each communication system by the above processing
, The process of the mobile station MS is performed in step S1 of FIG.
Proceed to 1. In step S11, the currently communicating base
Each communication system obtained in step S10 for the station BS-A
Report communication quality QoS information. When the base station BS-A receives this report,
The process of the base station BS-A proceeds from step S20 to S21.
Mu In step S21, the system characteristics held by the local station
The communication quality QoS is corrected using the data. Correct
Communication quality QoS relates to the communication system including its own station.
Only. The actual processing is as shown in FIG.
It is. In step S80 of FIG. 7, the mobile station MS
The communication quality QoS of all communication systems transmitted from
I believe. In step S81, the received plurality of communication qualities
Communication quality Q of the communication system to which the authorities belong in QoS
oS (1) is extracted. In step S82, the authorities
System characteristics data (channel capacity, device resources, power consumption
Input). In step S83, each characteristic data
Enter the weight coefficient data. Weight coefficient data
Is previously stored as fixed data on the base station BS-A.
ing. In step S84, the communication system to which the authority belongs.
System communication quality QoS (1) is recalculated and corrected. Ingredients
Specifically, the calculation shown in FIG. 8 is performed. Next, the base station
The BS-A process proceeds to step S22 in FIG. Step
In S22, as a service that can be used by the mobile station MS
The communication quality QoS values of all detected services
Compare and identify the order of their magnitude relationship. As a result of step S22, the mobile station M
S with a larger QoS than the service currently used by S
If quality of service is available,
In step S23, the mobile gateway exchange MG
Report to SA. Mobile gateway exchange MGS-A
When receiving a report from the base station BS-A of S23,
The process of the moving gateway exchange MGS-A is performed from step S30 to step S30.
Proceed to 31. In step S31, the mobile station MS
Another service with a larger QoS than the service used
Identify whether or not can be used. Another big QoS
If the service is available, steps S31 to S3
Proceed to 2. In step S32, the service with the highest QoS is recorded.
Mobile gateway exchange M belonging to the communication system providing services
Radio to which the current position of the mobile station MS belongs to GS-B
Queries whether there is a free channel in the zone. This question
In conjunction with the mobile communication system gateway exchange MISGS
Mobile gateway exchange MGS-A to mobile gateway exchange M
Transferred to GS-B. When a free channel inquiry is received,
The process of the moving gateway exchange MGS-B is performed from step S50 to step S50.
Proceed to 51. In step S51, the mobile gateway exchange MG
SB manages the radio zone to which the current location of the mobile station MS belongs.
Whether there is a free channel for the base station BS-B
And report the result to the mobile gateway exchange MGS-A.
The Mobile gateway exchange MGS-A exchanges mobile gateway
When there is no reply from MGS-B
In step S3, the mobile gateway exchange MGS-A is processed.
Return from S2 to S31. In this case, the second QoS is
Identify if other large services are available. Sky
If there is no active channel, follow the order of QoS size.
Thus, the presence or absence of other services is checked sequentially. Mobile gateway exchange MGS-A replaces mobile gateway
When there is an answer that there is an empty channel from MGS-B
In step S3, the mobile gateway exchange MGS-A is processed.
Proceed from 2 to S33. In step S33, the mobile communication system
System switching required for inter-stem gateway exchange MISGS
Send a request. In step S34, the mobile gateway exchange
The exchange MGS-A uses the free channel of the base station BS-B as the base.
The mobile station MS is notified via the ground station BS-A. On the other hand, the transfer from the mobile gateway exchange MGS-A
When a system switch request is received,
The processing of the exchange MISGS proceeds from step S40 to S41.
Mu In step S41, the communication with the mobile station MS is performed.
The communication line of the switching destination communication system is connected to the subscriber line 52 of the communication partner.
Connect to Gate Exchange MGS-B. In this case, the mobile barrier
The processing of the exchange MGS-B is changed from step S52 to S53.
move on. In step S53, the connected subscriber line 52 is connected.
Are extended to the base station BS-B. The subscriber line 52 is extended to the base station BS-B.
If it continues, the process of base station BS-B is step S60.
To S61. On the other hand, in step S34 in FIG.
An empty channel notification sent by the gateway switch MGS-A is transferred.
When it reaches the mobile station MS, the process of the mobile station MS is performed in step S12.
To S13. In step S13, a module addition program
The communication of mobile communication service (B) is controlled under the control of Gram 37
Specific software module to realize the communication function
40 is loaded into the communication control unit 34 to be executable
The Also, the software module 40 is
Program of the programmable processing unit 20 using
Rewrite, add communication function of mobile communication service (B)
To do. With the addition of this communication function, the mobile station MS has two
Mobile communication services (A, B) can be used simultaneously
The Then, the process proceeds to next Step S14. Base station BS-B
Of step S61 and step S1 of mobile station MS
4 and base station BS-B and mobile station M
A wireless link with S is secured. Radio between the base station BS-B and the mobile station MS
When the line is connected, the mobile station MS connects two types of lines in parallel.
Connected to the communication partner station 51 at the same time
Become. That is, from the mobile station MS to the base station BS-A, the mobile
Gate exchange MGS-A, gateway exchange M between mobile communication systems
Via ISGS, fixed network 53, subscriber line 52
To connect the communication partner station 51 and the mobile station MS.
Ground station BS-B, mobile gateway exchange MGS-B, mobile communication system
Inter-stem gateway exchange MISGS, fixed network 5
3. The time to connect the communication partner station 51 via the subscriber line 52
Lines are formed simultaneously. Therefore, the mobile station MS temporarily has two types of transfers.
Using the mobile communication service at the same time,
Will communicate between each other. Base station BS-B and mobile station MS
When the wireless link between the mobile station MS and the mobile station MS is connected,
The process proceeds from step S14 to S15. In step S15
The mobile station MS switches the system to be used. In practice, the mobile station MS has two types of systems.
Because it already has the communication function of
Release the communication function corresponding to the communication system before switching.
Yeah. This processing is performed by the module release program 38 in FIG.
It is realized by executing. With this release, other communication devices
The ability can be added again. In step S16, the mobile station MS
Since the system switching is completed, the base station BS-
Report the completion of switching to B. Switching from mobile station MS
When the notification of completion is received, the processing of the base station BS-B
The process proceeds from step S62 to S63. In step S63, the base
The station BS-B reports the completion to the mobile gateway exchange MGS-B.
Make a notification. When a completion report is received from the base station BS-B,
The process of the mobile gateway exchange MGS-B starts from step S54.
Proceed to S55. In step S55, the mobile gateway exchange M
GS-B is a gateway exchange between mobile communication systems MISGS
Completion report will be made. From mobile gateway exchange MGS-B
When the completion report is received, the gateway exchange between mobile communication systems
The MISGS process proceeds from step S42 to S43.
In step S43, the gateway exchange M between mobile communication systems.
ISGS reports completion to mobile gateway exchange MGS-A
I do. MISGS gateway exchange between mobile communication systems
When the completion report is received from the mobile gateway exchange MGS-A
The process proceeds from step S35 to S36. Step S
36, the mobile gateway exchange MGS-A is the base station BS-A.
Disconnect the line connection with. Mobile gateway exchange MGS
When the line with -A is disconnected, the processing of base station BS-A
The process proceeds from step S24 to S25. Step S25
Then, the base station BS-A communicates with the mobile station MS through the radio channel.
Release. Note that the mobile terminal obtains the communication quality QoS.
Characteristic items (reception level, bit error rate,
Frame error rate, packet error rate, device resource, power consumption
Power, communication charges, sound quality, security, transmission rate, etc.)
Can be added or reduced as needed
The Also, for each weighting factor used when calculating QoS.
Terminal user request, communication environment, propagation environment, etc.
It may be changed for each terminal according to. As described above, the wireless terminal has a plurality of types of mobile objects.
Inter-system handover that adaptively selects communication systems
To investigate the effect of communication while
In addition, a simulation is performed using a computer.
It was. In this simulation, the conditions shown below
Was assumed. Conditions for selecting inter-system handover
Wireless terminal reception level as propagation environment characteristic data.
The transmission level is used as system-specific characteristic data.
(Communication speed) is used. And the reception level
In a system that continuously measures and the reception level is above the threshold
To select the system with the highest transmission rate. As a communication target system, a microcomputer is used.
Le System SA, Cellular System SB, MEO Satellite System
Assuming system SC, a wireless terminal is attached to the base station of each system.
Access to perform packet data communication. Each
The characteristics of the stem are as follows. Microcell system SA Frequency band: 1.9 GHz Access method: TDMA / TDD Fading: 2-wave Rayleigh (Equal level) Symbol rate: 192 kbaud Modulation method: π / 4 shift QPSK Transmission rate: 32 kbit / s Cellular system SB: Frequency band: 800 MHz Access method: TDMA / FDD Fading: 2-wave Rayleigh (Equal level) Symbol rate: 21 kbaud Modulation method: π / 4 shift QPSK Transmission rate: 9.6 kbit / s MEO satellite system SC: Frequency band: 2.5 GHz (downlink) Access method: DS-CDMA / FDD Fading: Rice (C / M = 10 dB) Symbol rate: 3.6 kbaud Modulation method: O-QPSK Transmission rate: 2.4 kbit / s Te, the control for the pilot
Result of despreading the channel using a common PN code sequence
The reception level estimated from the above can be used. Here, inter-system handover is performed.
The average packet on the downlink of each system
When the transmission success rate and throughput are as follows:
A transmission path model was created assuming a propagation environment. Microcell system SA Average packet transmission success rate: 50.3 [%] Throughput: 16.09 [kbit / s] Cellular system SB Average packet transmission success rate: 39.1 [%] Throughput: 3.75 [kbit / s] MEO satellite system SC Average packet transmission success rate: 95.9 [%] Throughput: 2.30 [kbit / s] In addition, the wireless terminal moves at about 14 km / h, and
2 waves for the wireless system SA and cellular system SB
Receiving Rayleigh fading, MEO satellite system SC
Was assumed to undergo rice fading. Each system in this simulation
FIG. 9 shows the result of reception level fluctuation and system selection of
Street. For system selection conditions,
(-10 dB) value for the average reception level of the packet
The threshold of rejection is transmitted, and transmission is performed in a system that exceeds this threshold.
It is assumed that the system with the highest rate is selected. However
However, the packet length is sufficiently smaller than the fade length,
As the time required for stem switching, 20 ms was assumed. When inter-system handover is performed
Average packet transmission success rate and throughput are as follows:
there were. Average packet transmission success rate: 91.6 [%] Throughput: 19.64 [kbit / s] As described above, smoothing is achieved by performing inter-system handover.
The average packet transmission success rate and throughput are improved.
I was able to confirm. The communication system switching radio terminal and communication of the present invention
According to the method switching method, various types of movement with one terminal
You can use a physical communication service and communicate during a call.
Mobile communication service with higher communication quality without interruption
You can also automatically migrate to Further, the function can be added by software control.
Since the system is switched by adding and releasing,
Various mobile communication services without complicating the hardware configuration
A terminal that can use services can be realized. In addition, wireless terminals
Provides high-quality services from multiple mobile communication services
By selecting and communicating, resources such as base stations
Can be used effectively, enabling telecom operators.
Network and base station installation costs and development costs.
Lead to a reduction in

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of a wireless terminal according to an embodiment; FIG. 2 is a block diagram illustrating a configuration example of a communication system. FIG. 3 Inter-system handover control sequence (1)
It is a flowchart which shows. FIG. 4 Inter-system handover control sequence (2)
It is a flowchart which shows. FIG. 5 is a flowchart illustrating a process in which a mobile terminal obtains QoS. FIG. 6 is a block diagram showing QoS calculation processing of a mobile terminal. FIG. 7 is a flowchart showing a process in which a communicating base station corrects QoS. FIG. 8 is a block diagram showing processing in which a communicating base station corrects QoS. FIG. 9 is a graph showing reception level fluctuations and system selection results for each system; [Description of Symbols] 10 Multimode Transmission / Reception Unit 11 Multiband Antenna 12 Feed Line 13 Reception High Frequency Amplifier 14 Transmission Power Amplifier 20 Programmable Processing Unit 21 DSP 22 FPGA 31 Display Unit 32 Operation Board 33 Audio Processing Unit 34 Communication Control Unit 35 System switching program 36 Communication quality detection program 37 Module addition program 38 Module release program 39 Software module library 40 Software module 51 Communication partner station 52 Subscriber line 53 Fixed network MS Mobile station BS-A, BS-B Base station MGS-A, MGS-B Mobile gateway exchange MISGS Gateway exchange between mobile communication systems

Continuation of the front page (72) Inventor Shuji Kubota 3-1, Otemachi, Chiyoda-ku, Tokyo, Nippon Telegraph and Telephone Corporation (56) Reference JP 10-13929 (JP, A) JP 11- 205842 (JP, A) (58) Field surveyed (Int.Cl. 7 , DB name) H04B 7/ 24-7/26 H04Q 7 /00-7/38

Claims (1)

  1. (57) Claims 1. A communication mode switching radio terminal capable of radio communication with radio base stations of a plurality of mobile communication systems of different types by software switching, A multimode transmission / reception means comprising an antenna and a feed line corresponding to transmission / reception of radio signals to / from a plurality of radio base stations respectively belonging to a plurality of mobile communication systems having different communication methods and frequencies; and the multimode transmission / reception means; A programmable device that can be connected and programmable for various functions such as modulation / demodulation and filtering necessary for communication, and controls the programmable device to receive radio signals from radio base stations of a plurality of mobile communication systems almost simultaneously. Quality signal reception control means, and a signal received from each radio base station under the control of the quality signal reception control means Communication quality QoS corresponding to each mobile communication system is calculated on the basis of the characteristic data regarding the propagation environment detected based on the data and the system-specific characteristic data of each mobile communication system, and a plurality of mobile communication systems Quality information sending means for sending communication quality QoS to a communicating radio base station, and when it becomes necessary to switch the mobile communication system used for communication to another system, mobile communication at the switching destination Module addition control means for adding software module control for realizing the communication function corresponding to the system to the control of the programmable device, and module release for releasing the software module for realizing the unnecessary communication function from the control of the programmable device A communication system switching radio terminal comprising a control means. 2. A communication system switching method for switching a mobile communication system used for communication by a wireless terminal capable of wireless communication with a plurality of wireless base stations of different mobile communication systems. In the wireless terminal, based on a plurality of received signals received from a plurality of wireless base stations belonging to a plurality of different types of mobile communication systems that can be used, propagation related to a propagation environment with each wireless base station Environment data is measured, and the wireless terminal calculates communication quality QoS of each mobile communication system based on the propagation environment data and the corresponding system characteristic data of the mobile communication system, and the wireless terminal In the terminal, the communication quality Q relating to each of a plurality of mobile communication systems with respect to the first radio base station used by the radio terminal for communication. The first radio base station ranks the communication quality QoS of each mobile communication system based on the communication quality QoS of each mobile communication system reported from the radio terminal, and 1 radio base station reports the order of communication quality QoS of each mobile communication system to the first mobile gateway exchange of the mobile communication system to which the mobile station belongs, and the first mobile gateway exchange The switching destination mobile communication system is identified in the order according to the communication quality QoS order reported from the base station, and the second mobile gateway exchange belonging to the switching destination mobile communication system is switched. An inquiry is made as to whether or not the second radio base station belonging to the previous mobile communication system can be connected to the radio terminal, and the first mobile gateway switching center determines that the second radio base station and the radio are connected as a result of the inquiry. end A communication system switching method, characterized by requesting the second radio base station to switch a mobile communication system by inter-system handover when connection to a terminal is possible. 3. The communication system switching method according to claim 2, wherein:
    The first radio base station corrects the received communication quality QoS in consideration of the system characteristic data held by the own station for the communication quality QoS of the mobile communication system to which the own station belongs. Method switching method. 4. The communication system switching method according to claim 2, wherein:
    The wireless terminal calculates communication quality QoS using at least one of reception level, multipath delay characteristics, bit error rate, frame error rate and packet error rate as the propagation environment data. Method. 5. The communication method switching method according to claim 2, wherein:
    A communication system switching method, wherein the wireless terminal calculates communication quality QoS using at least one of transmission speed, security characteristics, communication charges, device resources, and power consumption as the system characteristic data. 6. The communication method switching method according to claim 3, wherein
    The communication method switching method, wherein the first radio base station uses at least one of channel capacity, device resource, and power consumption as the system characteristic data held by the own station, and corrects the communication quality QoS. . 7. The communication system switching method according to claim 2, wherein when the first mobile gateway switching center requests the second radio base station to switch the mobile communication system by inter-system handover. In a state where communication between the first radio base station and the radio terminal is continued, a line connected to a communication partner station is connected to the second mobile gateway exchange by the control of the first mobile gateway exchange. After connecting to the second wireless base station via the network, securing a switching destination wireless communication line between the second wireless base station and the wireless terminal, and after securing the switching destination wireless communication line Then, the mobile communication system used for communication by the wireless terminal is switched, and the second mobile gateway switching station is configured to switch the first wireless base station and the wireless terminal to the first mobile gateway switching station. Make a request to release the connection In response to this request, the first mobile gateway switching station communication system switching method, characterized in that to release the connection between the said first radio base station radio terminal.
JP22733199A 1999-08-11 1999-08-11 Communication system switching radio terminal and communication system switching method Expired - Lifetime JP3442320B2 (en)

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