JP2009111603A - Method for controlling cellular phone multisystem access - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To relax a congested state in an emergency by restricting an access reception from other network terminals in accordance with a situation and performing a connection request to a network that can be easily connected on the basis of a call loss rate, or the like or during the occurrence of a disaster in multisystem access of a cellular phone. <P>SOLUTION: The service quality of a self-network is observed, and a reception rate of a connection requests from other networks is determined while maintaining the quality to impose reception restrictions. As quality, a call loss rate, a connection loss rate, a packet discarding rate and packet delay are used. In addition, an elapsed time of a multisystem access control state may be used. Thus, an increase in a call loss rate, a connection loss rate, a packet discarding rate and packet delay to the self-network of each terminal caused by an increase in a connection request and communication from the other networks can be suppressed, and an increase in communicable terminals can be achieved. Moreover, information or notification of the reception rate is received to weight selection of a network for requesting connection. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is not limited to the base station of a mobile phone network (hereinafter referred to as own network) that has been contracted and usually used in response to a sudden increase in communication demand during a disaster or the like, and other mobile phone networks (hereinafter referred to as other networks). The mobile phone multi-system access control method can increase the number of mobile phones that can communicate with each other by accessing (that is, connecting) the base station.

  At the time of large-scale disasters such as earthquakes, communication demand (call volume) to landline and mobile phones will increase rapidly due to confirmation of safety in the affected areas. In particular, since mobile phones are usually carried by users, they are very effective as a means of communication in the event of a disaster. However, since the mobile phone performs communication within a finite predetermined frequency band, there is a problem that it is difficult to secure a necessary communication capacity (number of channels) when the communication demand rapidly increases.

  In fact, in the Niigata Chuetsu earthquake that occurred in October 2004, calls from Niigata to the Niigata prefecture were approximately 45 times as many mobile phone operators as compared to the normal peak. However, it was about 17 times for another mobile phone carrier and 3 to 4 times for another mobile phone carrier. The base station waves also differ from the total of 61, 37, and 91 stations for each mobile phone carrier.

  For this reason, Non-Patent Document 1 focuses on multi-system access that accesses (connects) not only the base station of its own network but also the base station of another network, and communication from the viewpoint of the user by this multi-system access. Increasing the opportunities available is being considered.

  If a connection request can only be made to a conventional single network, the call will only be lost if the connection request is not accepted, but in the case of multi-system access, the final request will be made after connection requests to multiple networks. There are cases where the network cannot be connected to the network, and cases where the network cannot simply be connected. Therefore, the former is a communication loss and the latter is a call loss or connection loss.

  Further, according to Non-Patent Document 1, in the result of multi-system access computer simulation, connection requests from terminals in other networks increase in addition to connection requests from terminals in the own network. As the demand increases and the burden on each network increases, the rate of connection loss may increase, or it may be possible to connect with a base station of another network, and eventually the number of terminals that can communicate will increase But it is clear.

A connection flowchart of conventional emergency mobile phone multi-system access is shown in FIG. In an emergency such as an earthquake, processing according to this flowchart is performed.
(1) When a communication request occurs, the terminal makes a connection request to its own network, and if there is an empty slot (line), communication is started.
Here, when only a normal single network can request connection, the communication request ends with a communication loss because communication is impossible. However, the emergency mobile phone multi-system access requires connection to another network.
(2) If there is an empty line in another network, communication is started using that line, otherwise there is a connection loss,
(3) If there is no other network, this communication request ends with a communication loss because communication is not possible.

  Emergency mobile phone multi-system access includes various mobile phone systems such as PHS (Personal Handy-phone System), PDC (Personal Digital Cellular), W-CDMA (Wideband Code Division Multiple Access), and wireless LAN (Local Area Network). It is possible by allowing a terminal that can access a plurality of terminals and a network side to accept terminals that are not contracted. As for terminals, PDC and W-CDMA dual mode terminals are already on the market, and are expected to increase and become more widespread with the development of software defined radio technology.

  In this emergency mobile phone multi-system access, when the base station of the local network is congested or stopped, the base station of another network may be able to connect, and finally communication is possible. The number of terminals will increase. However, since connection requests from other network terminals increase in addition to connection requests from terminals on the own network, connection requests to each network increase, the burden on each network increases, and the rate of connection loss When voice is transmitted by IP (Internet Protocol) or when packet communication is mixed and sent to a voice communication line, the packet discard rate and packet delay of the call during communication increase. was there. Further, by connecting a terminal of another network, a line is used, and the connection loss of the local network terminal to the local network increases. This means that the user who is using it normally cannot use his / her network for the user of another network, and there is also a problem that unfair feeling arises.

  In addition, the following techniques are known as techniques for enabling selection of other conventional networks.

  In Patent Document 1 (Japanese Patent Laid-Open No. 2001-197538), there is one that measures a reception level including other networks at the time of handover accompanying a decrease in the reception level and selects another network in comparison with a user's desired network list. It is disclosed. Patent Document 2 (Japanese Patent Application Laid-Open No. 2005-198074) selects a network that has an appropriate attribute of an application program that operates on a terminal such as accurately reaching, immediacy, and security when selecting a network. It is disclosed. Further, in Patent Document 3 (Japanese Patent Laid-Open No. 2005-203926), when selecting a network, it is possible to select a network to start connection in consideration of a user request of a receiving terminal or a radio wave condition of the receiving terminal. Is disclosed. Patent Document 4 (Japanese Patent Laid-Open No. 2005-244463) selects an appropriate network in consideration of the location of a terminal when connecting a mobile terminal having individual numbers in a plurality of networks of a mobile phone and a wireless LAN. It is disclosed.

  In order to protect the local network, which is a notable issue, and to ensure the connectivity of local network users, all of these are used in a congested environment where each network is congested, such as during a large-scale disaster. It does not limit the call acceptance rate from the network. Also, the acceptance rate is not notified to the terminal, and the outgoing call volume itself is not reduced.

  Regarding congestion control between communication networks, Patent Document 5 (Japanese Patent Laid-Open No. 6-326710) discloses a congestion control apparatus that can be simplified and requires less memory by giving a pseudo network load. However, this is related to the control of traffic flowing between networks, and does not control outgoing calls by selection from other network terminals in order to protect its own network, and also notifies or notifies the acceptance rate to the terminals. It does not reduce the outgoing call volume itself.

JP 2001-197538 A JP 2005-198074 A JP 2005-203926 A JP 2005-244463 A JP-A-6-326710 Kimura, Okada, Ogura, Shinoda, “A Study on Emergency Mobile Phone Multisystem Access in Large-Scale Disasters,” IEICE Technical Report, CQ2004-51, pp13-18, July 2004 ARIB Evaluation Group, “Evaluation Methodology IMT-2000 Radio Transmission Technologies (Version. 1.1)”, Sep. 1998.

  Conventionally, in an emergency, only a connection request is made to another network, so the connection request to each network increases, the burden on each network increases, and the rate of connection loss increases. In addition, there is a problem that the packet discard rate and packet delay of a call during communication increase. In addition, by connecting a terminal of another network, the line is used, and the connection loss of the local network terminal to the local network increases. There was also a problem that the network could not be used.

  In the present invention, these problems are improved by restricting acceptance from other networks according to the situation according to observation of the call loss rate and the time from the occurrence of a disaster. Further, in order to suppress the connection request, a connection request using weighting is performed for selection of the connection request network.

  By applying the present invention, it is possible to alleviate an emergency congestion state in the mobile phone system.

  In the present invention, at the time of multi-system access, the service quality of the own network is observed, the rate of accepting connection requests from other networks is determined while maintaining the service quality of the terminals of the own network, and acceptance is restricted. As a result, a call loss rate or a connection loss rate that is a quality of service when the local network terminal is connected to the local network, or a call packet during a communication that is a quality of service during the communication due to an increase in connection requests and communication from other networks Reduce the increase in drop rate and packet delay. Furthermore, it is possible to realize the effect of increasing the number of terminals that finally become communicable caused by multi-system access.

  In the following, the case where two networks exist is described. However, two networks selected from a number of networks are described, and a base selected from a plurality of base stations connected to each network is described. It is natural to mention the station.

For this reason, the present invention comprises a first base station connected to a first network;
A second base station connected to a second network;
A first base station and a second base station can be connected via radio waves, each including a first terminal group and a second terminal group including a plurality of mobile phone terminals,
The first terminal group and the second terminal group are applied to a mobile phone system that is connected to the first base station and the second base station via radio waves or in a connection standby state, respectively. More specifically, the mobile phone terminal belonging to the first base station, the second base station, and the first terminal group or the second terminal group upon receiving a signal indicating an emergency. Each has its own means for setting itself to a multi-system access control state;
A means of observing connection service quality or communication service quality;
Means for determining an acceptance rate for connection requests from other networks;
The present invention is applied to a mobile phone system including
In such a cellular phone system, when there is a connection request from a terminal of another network, a call is started according to the following procedure. That means
1) Determine whether it is in multi-system access control state,
If it is in the multi-system access control state, proceed to the next step. If the multi-system access control state is not set, a connection request is not accepted.
2) Determine the probability of accepting a connection request from a terminal of another network in the multi-system access control state.
3) Accept a connection request from a terminal of another network with the above probability.
4) The presence / absence of a free line is searched, and if there is, the process proceeds to the next step, and if not, it is processed as a connection loss.
5) Start a call if there is an available line.
In this way, upon receiving a signal indicating an emergency, the mobile phone system is set to the multi-system access control state, and the connection service quality or the communication service quality deteriorates (or improves) as the connection service quality or communication service quality deteriorates (or improves). Decrease (or increase) acceptance.

In particular, 2) determining the probability of accepting a connection request from a terminal of another network in the multi-system access control state,
Determining a probability of accepting a connection request from a terminal of another network in the multi-system access control state according to the connection service quality indicator;
Can be.

Similarly, 2) the step of determining the probability of accepting a connection request from a terminal of another network in the multi-system access control state,
Determining a probability of accepting a connection request from a terminal of another network in the multi-system access control state according to the communication service quality indicator;
Can be.

As an index of the connection service quality, the call loss rate or the connection loss rate of the own network can be used.

Further, as an index of the communication service quality, a packet discard rate or a packet delay time of a call during communication of the own network can be used.

Also, during large-scale disasters such as large cities and earthquakes with large seismic intensity, the increase in call volume is rapid, and many base stations stop and occur instantaneously. . For this reason, it is calculated from call volume fluctuation data at the time of past earthquakes, etc., and the acceptance rate is determined every predetermined time, and acceptance restriction is performed. Therefore, determining the probability of accepting a connection request from a terminal of another network in the above-mentioned 2) multi-system access control state state is
This can be done according to the elapsed time of the multi-system access control state. This also applies to cases where the call loss rate, connection loss rate, packet discard rate or packet delay of a call during communication is expected to recover with the above-described elapsed time.

  The first base station or the second base station optimizes the acceptance rate according to the time zone, day of the week, or calendar day for each type of event or disaster, and changes the setting parameter according to the situation. While operating. By such an operation, a quick and efficient operation reflecting past data can be performed.

Even in the above case, since unnecessary connection requests are generated from terminals of other networks, it is desired to suppress them. This can be suppressed as follows.
First, each base station broadcasts an acceptance rate to a terminal group using a broadcast channel. When each mobile phone terminal issues a connection request to another network, each terminal determines another network to request connection from a comparison of the acceptance rates of the respective base stations obtained from the broadcast channel. In many cases, connection requests are transmitted in descending order of acceptance rate.

Instead of notifying the acceptance rate by the broadcast channel, as a response to the connection request from each terminal group, notify the acceptance rate of the base station of the other network,
When each mobile phone terminal issues a connection request to another network, each terminal can determine the base station of the other network that requests connection from the comparison of the acceptance rates of the respective base stations obtained from the notification. . The advantage of this method is that it is easy to change the notification contents of the acceptance rate for each mobile phone terminal.

  When there are a large number of networks in addition to the network, at least one base station connected to any of these networks can receive an acceptance rate using the broadcast channel to a terminal group connected to the network. You may make it alert | report.

  The signal indicating that an emergency has occurred can be issued by the first base station or the second base station.

  Further, the signal indicating that an emergency has occurred may be issued by a mobile phone terminal belonging to the first terminal group or the second terminal group.

FIG. 6 shows an example of a cellular phone system to which the present invention is applied.
FIG. 6 shows a first base station (base station A) connected to the first network (Company A backbone line) and a second base station connected to the second network (Company B backbone line). (Base station B), a first terminal group (terminals A-1 to A-5), and a second terminal group (terminals B-1 to B-4) are shown. In a normal case, the first terminal group is connected to the first base station, and the second terminal group is connected to the second base station or is in a connection standby state. In addition, the mobile terminal can support a dual network service such as FOMA (registered trademark) N2701 (NTT DOCOMO).

  FIG. 7 shows an example of a known base station and exchange. When the present invention is applied to the configuration shown in this figure, the present invention relates particularly to the call control processing unit (CCP). This call control processing unit performs calling / incoming call control between the mobile switching center (MSC) and the mobile station.

  In summary, in the present invention, when a terminal or multi-system access becomes possible in an emergency such as a disaster, the call loss rate or connection loss rate of the own network, the packet discard rate or packet delay of the call during communication, etc. And determine the acceptance rate of connection requests from other networks while maintaining the service quality of the terminals of its own network. The feature of the present invention is that the call loss rate and connection loss rate of the own network, which are connection service quality, and the packet discard rate and packet delay, etc. of a call during communication, which are communication service quality, are set to such an extent that does not interfere with the call. The point is to accept connection requests from the network. For this reason, the observation-type emergency multi-system access acceptance restriction control or the reservation-type emergency multi-system access acceptance restriction control that decides the acceptance rate at predetermined intervals for cases where observation cannot be followed. Do. These flowcharts and block configuration diagrams are shown in FIGS. 1 and 2, and FIGS. 3 and 4, respectively. Another feature is to reduce the number of connection requests. For this purpose, the acceptance rate of each network is notified from each base station to the terminal through a broadcast channel. For terminals belonging to a plurality of networks, the acceptance rate of each network may be notified to each terminal through a broadcast channel from one base station. Alternatively, when a terminal makes a connection request to its own network, information is obtained by putting information on the acceptance rate of another network in a connection control signal from its own network. On the terminal side, the connection request is made by weighting the selection of the connection request network. For example, connection requests are made in descending order of acceptance rate. This is because a connection request to another network with a low acceptance rate is not accepted.

FIG. 1 is a diagram showing an observation-type emergency multi-system access acceptance restriction control flowchart in a base station or an exchange station. This is controlled based on the observed call loss rate. In the case of a packet communication network such as VOIP (Voice Over Internet Protoco1) and when packet communication is mixed and sent to a voice communication line, observation of the packet discard rate and packet delay of a call during communication is used. The flowchart is the same as in FIG.
First, in response to an emergency signal, the mobile phone system is in the multi-system access control state, and accepts connection requests from terminals on other networks.
F1: When there is a connection request from a terminal on another network
F2: Connection requests are not accepted during normal times, but in the event of an earthquake or other emergency (ie, multi-system access control status)
F3: If the call loss rate of your network is less than x1%,
F4: Accept connection request with a probability of Y1%, and if not less than X1%,
F7: If the call loss rate of the local network is X2% or less,
F8: A connection request is accepted with a probability of Y2%.
If it exceeds X2%,
F10: A connection request is not accepted.
In FIG. 1, the probability of accepting a connection request has only two stages. However, if more detailed control is desired, the number of stages is increased. If it is not accepted, connection loss occurs. If it is accepted, if there is an available line, connection is started, and if there is no available line, connection loss occurs.

FIG. 2 is a block diagram of an observation-type emergency multisystem access acceptance restriction control apparatus in a base station or an exchange station. The control is based on the observed call loss rate, but the same applies to the case of using the packet discard rate or packet delay of a call during communication.
When a request from another network terminal is observed by the other network terminal connection request observation device 1, the observed value and threshold value from the own network terminal call loss rate observation device 7, own network call loss rate determination threshold memory 8, and other network acceptance probability threshold memory 5 The other network terminal connection acceptance determination device 2 determines acceptance / rejection according to the flowchart of FIG. If it is determined that acceptance is possible, the connection request connection determination device 3 determines that the connection request is possible when the free line observation device 6 is a free line, and the connection processing device 4 performs connection processing.

FIG. 3 is a flowchart of reservation-type emergency multisystem access acceptance restriction control in the base station or the switching center. In this case, the mobile phone system is in a multi-system access control state in response to an emergency signal, and accepts connection requests from terminals on other networks.
F1: When there is a connection request from a terminal of another network
F2: If it is normal time, do not accept connection requests, or if an earthquake or other emergency occurs,
F3: If it is within T1 time from the occurrence of disaster, F4: Accept connection request with a probability of Y1%,
F7: If T1 time is exceeded and within T2 time,
F8: Accept connection request with probability of Y2%,
F10: If the time exceeds T2 time, the connection request is not accepted. Even in FIG. 3, the probability of accepting a connection request is only two stages. However, if more detailed control is desired, the number of stages is increased. If it is not accepted, it will result in a connection loss. If it is accepted, if there is an available line, connect and start communication.
If there is no free line, connection loss occurs.

  FIG. 4 is a block diagram of reservation type emergency multi-system access acceptance restriction control in the base station or the switching center. When the other network terminal connection request observation device 1 observes whether the request of the other network terminal is observed, the other network connection acceptance determination device 2 uses the information from the timer 9 and other network acceptance probability threshold value memory 5 to keep time. Whether or not to accept is determined according to the flowchart of FIG. If it is determined that acceptance is possible, the connection request connection determination device 3 determines that the connection request is possible when the free line observation device 6 determines that a free line exists, and the connection processing device 4 performs connection processing.

  Since other networks with a low acceptance rate are less likely to accept a connection request, in order to reduce the number of connection requests, the acceptance rate of each network is notified to the terminal through a broadcast channel. Alternatively, when a terminal makes a connection request to its own network, information is obtained by putting information on the acceptance rate of the other network in a connection control signal sent from its own network as a response. This broadcast channel is provided separately from the channel used for a call, is a channel common to each mobile terminal, may be provided in a regular time zone, and may be streamed as story information. On the terminal side, connection is requested by weighting the selection of the connection request network so that the connection request is not made so much to the network with a low acceptance rate. For example, connection requests are made in descending order of acceptance rate.

FIG. 5 is a flowchart including an operation for setting the mobile phone system to the multi-system access control state. First, as a preparation
F11: In response to an emergency signal, the mobile phone system is set to the multi-system access control state,
F12: Determine a probability P of accepting a connection request from a mobile terminal of another network.
here,
F1: When a connection request is received from a mobile terminal on another network,
F2: If the mobile phone system is not in the multi-system access control state, the acceptance is rejected (F10). If the mobile phone system is in the multi-system access control state,
F3: Accept a connection request from a mobile terminal of another network with the probability P described above,
F5: Search for an empty line, and if there is no empty line, treat it as a connection loss (F9).
F6: Connect and start communication.

  Next, the computer simulation of the present invention and the results will be described. As a simulation model for this purpose, as shown in FIG. 8, a macro cell network and a micro cell network exist and two are overlaid. Further, as shown in FIG. 8, the service area was set to 21 × 21 blocks with reference to the Manhattan model described in Non-Patent Document 2 consisting of buildings and roads. The base stations of the macro cell network and the micro cell network are arranged on the road according to certain rules.

  FIG. 9 shows the configuration of blocks and roads in the model. In order to avoid the edge effect, the range in which the statistical data was acquired was 7 × 7 blocks in the center. In addition, the movement of the terminal is not considered. The main simulation conditions at this time are shown in the table of FIG. Computer simulations were performed for cases where only a single network can be accessed (SSA), emergency multi-system access (EMSA), and acceptance restriction control based on observation of a call loss rate (EMSA-C). In the case of acceptance restriction control, the acceptance rate is set to 0.3 until the call loss rate of the micro cell network reaches 0.7, and the call loss rate higher than that is not accepted, and the macro cell network does not perform control.

The results of simulations under these conditions are shown in the table of FIG.
The communication loss rates that could not be finally communicated were 0.487 for SSA, 0.286 for EMSA, and 0.389 for EMSA-C. In EMSA, since a connection request can be made to another network, the communication loss rate is lower than that of SSA, and more terminals can finally communicate.

  When there is acceptance restriction control (EMSA-C), acceptance from other networks is restricted, so the communication loss rate increases compared to EMSA, but is lower than SSA. Also, when looking only at the micro cell network, due to acceptance restrictions, the terminal of the micro cell network is less likely to be unable to connect to the micro cell network that is its own network due to the connection request of the terminal of the macro cell network that is another network. Therefore, it is lower than 0.129 and EMSA.

  With regard to the number of connection requests, in EMSA, a total of 373886 increases due to connection requests from other networks, and the burden on each network increases. However, in EMSA-C, it does not increase greatly compared with 283811 and SSA.

  Furthermore, regarding the connection loss rate, in SSA, the connection loss rate of the micro cell network was 0.0294, whereas in EMS, the connection request of the macro cell network, which is another network, was received as 0.535. It will be very high. However, in EMSA-C, since the acceptance is limited to 0.251, an increase in the connection loss rate can be suppressed.

  As described above, when the acceptance restriction control based on the observation of the call loss rate is performed on the EMSA, the load on each network is reduced by the acceptance restriction control, and the network connection request is protected and finally communication is possible. It has been clarified by computer simulation that the communication loss rate can be reduced.

  The present invention can be used not only for a sudden increase in communication demand at the time of a disaster, but also as a countermeasure for congestion due to a New Year greeting phone call, a congestion state due to an event such as a soccer field, a baseball field, or a concert hall.

  In addition, the acceptance rate is optimized according to the time zone, day of the week, or calendar day for each type of various events and disasters, and when the present invention is applied, it is operated while changing according to the situation as a setting parameter. Thereby, the inconvenience seen from the mobile phone user can be suppressed.

It is a figure which shows the observation type emergency multisystem access acceptance restriction control flowchart in a base station or an exchange. FIG. 2 is a block diagram of an observation type emergency multisystem access acceptance restriction control apparatus in a base station or an exchange station. It is a flowchart of reservation type emergency multisystem access acceptance restriction control in a base station or an exchange. It is a block block diagram of reservation type emergency multisystem access acceptance restriction control in a base station or an exchange. It is a flowchart including the operation which sets a mobile telephone system to a multi-system access control state. It is a figure which shows an example of the mobile telephone system which is going to apply this invention. It is a figure which shows an example of a well-known base station and an exchange. It is a figure which shows a computer simulation model. It is a figure which shows the structure of the block and road in a computer simulation model. It is a figure which shows the table | surface of main simulation conditions. It is a figure which shows the table | surface of a simulation result. It is a connection flowchart of the conventional emergency cellular phone multi-system access.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Other network terminal connection request observation apparatus 2 Other network terminal connection acceptance determination apparatus 3 Connection request connection determination apparatus 4 Connection processing apparatus 5 Other network acceptance probability threshold memory 6 Free line observation apparatus 7 Own network terminal call loss rate observation apparatus 8 Own network call loss rate Discrimination threshold memory 9 Timer

Claims (12)

A first base station connected to a first network;
A second base station connected to a second network;
A first base station and a second base station can be connected via radio waves, each including a first terminal group and a second terminal group including a plurality of mobile phone terminals,
In the mobile phone system in which the first terminal group and the second terminal group are respectively connected to the first base station and the second base station via radio waves or in a connection standby state,
further,
In response to an emergency signal,
The first base station, the second base station, and the respective mobile phone terminals belonging to the first terminal group or the second terminal group respectively have their respective means for setting themselves to the multi-system access control state. ,
A means of observing connection service quality or communication service quality;
Means for determining the acceptance rate for connection requests from other networks;
With
When there is a connection request from a terminal on another network,
1) Determine whether it is in multi-system access control state,
If it is in the multi-system access control state, proceed to the next step, and if not in the multi-system access control state, the step of not accepting a connection request;
2) determining a probability of accepting a connection request from a terminal of another network in the multi-system access control state;
3) receiving a connection request from a terminal of another network with the above probability;
4) Verify whether there is a free line, and if yes, proceed to the next step, otherwise, treat as a connection loss;
5) a step of starting communication if there is a free line;
With
In response to an emergency signal, the mobile phone system is set to the multi-system access control state, and as the connection service quality or communication service quality deteriorates (or improves), the acceptance from other networks decreases (or A mobile phone multi-system access control method. 2) determining the probability of accepting a connection request from a terminal of another network in the multi-system access control state,
Determining a probability of accepting a connection request from a terminal of another network in the multi-system access control state according to the connection service quality indicator;
The mobile phone multi-system access control method according to claim 1, wherein: 2) determining the probability of accepting a connection request from a terminal of another network in the multi-system access control state,
Determining a probability of accepting a connection request from a terminal of another network in the multi-system access control state according to the communication service quality indicator;
The mobile phone multi-system access control method according to claim 1, wherein: As an indicator of the above connection service quality,
3. The mobile phone multi-system access control method according to claim 2, wherein a call loss rate or a connection loss rate of the own network is used. As an indicator of the above communication service quality,
4. The mobile phone multi-system access control method according to claim 3, wherein a packet discard rate or a packet delay time of the own network is used. 2) determining the probability of accepting a connection request from a terminal of another network in the multi-system access control state,
Determining a probability of accepting a connection request from a terminal of another network in the multi-system access control state according to the elapsed time of the multi-system access control state;
The mobile phone multi-system access control method according to any one of claims 1 to 3, characterized in that:   The first base station or the second base station optimizes the acceptance rate according to the time zone, day of the week, or calendar day for each type of event or disaster, and changes the setting parameter according to the situation. The mobile phone multi-system access control method according to any one of claims 1 to 6, wherein the mobile phone multi-system access control method is operated. Each base station broadcasts the acceptance rate to each terminal group using a broadcast channel,
When each mobile phone terminal issues a connection request to another network, each terminal determines another network to request connection from a comparison of acceptance rates of the respective base stations obtained from the broadcast channel. ,
The mobile phone multi-system access control method according to any one of claims 1 to 3. Each base station notifies the acceptance rate of base stations in other networks as a response to the connection request from each terminal group,
When each mobile phone terminal issues a connection request to another network, each terminal determines a base station of the other network that requests connection from a comparison of the acceptance rates of the respective base stations obtained from the notification. And
The mobile phone multi-system access control method according to any one of claims 1 to 8.   In addition to the network, the network includes a larger number of networks, and at least one base station connected to any of these networks notifies the terminal group connected to the network of the acceptance rate using the broadcast channel. The mobile phone multi-system access control method according to claim 9, wherein: The signal that it is an emergency is
The mobile telephone multi-system access control method according to any one of claims 1 to 10, wherein the first base station or the second base station originates. The signal that it is an emergency is
11. The mobile phone multi-system access control method according to claim 1, wherein the mobile phone terminals belonging to the first terminal group or the second terminal group originate.

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