JP2011249965A - Radio communication system, base station and mobile station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten processing time at performing handoff between systems.SOLUTION: Radio communication systems stochastically determines whether pre-registration has been performed or not depending on a travel route and travel speed of a mobile station. The radio communication systems can gradually start pre-registration depending on a distance from a service border between the systems, reduces probability of uncompleted pre-registration during high-speed traveling, and at the same time shortens processing time of handoff between the systems by increasing probability that a device performed pre-registration and a device performed handoff between the systems are the same.

Description

  The present invention relates to a radio communication system, a base station, and a mobile device, and more particularly to a radio communication system, a base station, and a mobile device that efficiently move between systems using different radio technologies.

A wireless communication system may have a plurality of systems with different standards. For example, 3GPP2 HRPD (High Rate Packet Data) system and 3GPP E-UTRAN (Evolved UMTS Terrestrial Radio Access Network) system. Interworking technology for switching between wireless communication systems while continuing the services currently being performed by mobile devices, such as when mobile devices move across areas that can communicate with these different wireless communication systems For example, the standard regarding the interworking of the HRPD system and the E-UTRAN system is defined in Non-Patent Document 1 or Non-Patent Document 2.
When inter-system handoff is performed to switch between radio communication systems when moving between different radio communication systems, setup is required to establish a call connection between the mobile station and the base station that is the inter-system handoff destination. Therefore, there is a problem that the service is interrupted during the setup. According to the standard of Non-Patent Document 1 or Non-Patent Document 2, in order to reduce the service interruption time, the mobile device and the inter-system handoff destination radio communication system are connected via the inter-system handoff source radio communication system. A pre-registration process has been proposed in which call connection setup is performed in advance. Whether or not the mobile device performs the pre-registration process is determined based on a pre-registration execution permission flag notified to the mobile device from the base station of the wireless communication system that is the inter-system handoff source.

The 3rd Generation Partnership Project (3GPP) Specifications, [online], The3rd Generation Partnership Project, [February 16, 2010 search], Internet <URL: http: // www. 3 gpp. org / specifications> The 3rd Generation Partnership Project 2 (3GPP2) Specifications, [online], The3rd Generation Partnership Project 2, [Search February 16, 2010], Internet <URL: http: // www. 3gpp2. org / Public_html / specs / index. cfm>

When pre-registration execution determination is based on flag information only, when mobile devices moving at high speed in trains or other transport facilities move all at once to the area of the base station that permits pre-registration, There is a possibility that the mobile devices perform pre-registration all at once, and a state occurs in which the time until the pre-registration processing for all the mobile devices is completed becomes long. In this case, due to the long pre-registration processing time, a mobile station that has reached the boundary between systems before completion of pre-registration must perform an inter-system handoff without pre-registration being completed. It will be. In this case, since the mobile device that has not completed pre-registration needs to perform setup for direct call connection with the inter-system handoff destination system, there is a problem that the service is interrupted until the setup is completed. is there.
As an improvement measure, it is conceivable to widen the area where pre-registration is permitted in an area where mobile devices are moving at a high speed all at once. Since the pre-registration can be performed from the time when the mobile device is away from the boundary where the inter-system handoff is performed, it is possible to reduce the number of mobile devices in which pre-registration is not completed due to high-speed movement. However, widening the pre-registration area increases the number of mobile devices that have performed pre-registration but do not perform inter-system handoff. As a result, there is a high probability that call setup information is held more than necessary in the handoff destination system, which may result in resource shortage due to wasteful consumption of resources. In addition, by performing pre-registration at a location away from the boundary where the mobile device performs inter-system handoff, the route pattern that the mobile device travels before the handoff is performed after pre-registration increases. The probability that the registration destination device and the inter-system handoff destination device are different increases. When the process of transferring the call connection information set up by this influence from the pre-registration destination device to the inter-system handoff destination device is performed, there is a problem that the time required for the inter-system handoff increases.
When pre-registration fails, the service interruption time due to the inter-system handoff process is about 10 seconds. On the other hand, when the pre-registration is successful, it can be suppressed within 1 second. Since the service interruption time greatly affects real-time services such as voice communication, it is necessary to increase the success rate of pre-registration and shorten the handoff processing time.
The present invention has been made in view of the above points, and it is an object of the present invention to appropriately select a base station that executes pre-registration processing and an execution base station before performing inter-system handoff, and to shorten the handoff processing time. .

  The present invention enables pre-registration execution determination probabilistically according to the moving route and moving speed of a mobile device in a system capable of handing off without interrupting services between wireless communication systems using different wireless technologies. Start pre-registration according to the distance from the system boundary. The pre-registration execution probability is determined by the monitoring device based on the movement route information of the mobile device and notified to the base station or the mobile device.

According to the first solution of the present invention,
A wireless communication system capable of handoff between first and second wireless systems communicating with a base station and a mobile device using different wireless technologies,
In the first area of the first wireless system,
According to the pre-registration execution probability based on the movement probability from the first area to the second area of the second wireless system, which is obtained based on movement route information of a plurality of mobile devices, the mobile device Whether pre-registration processing for exchanging communication information with the second wireless system at the handoff destination via the base station of the first wireless system is performed with the second area as the handoff destination. A wireless communication system that performs the determination is provided.

According to the second solution of the present invention,
In the wireless communication system capable of handoff between the first and second wireless systems communicating with the base station and the mobile station using different wireless technologies, the base station is disposed in the first area of the first wireless system. And
According to the pre-registration execution probability based on the movement probability from the first area to the second area of the second wireless system, which is obtained based on movement route information of a plurality of mobile devices, the mobile device Whether pre-registration processing for exchanging communication information with the second wireless system at the handoff destination via the base station of the first wireless system is performed with the second area as the handoff destination. The base station for making the determination is provided.

According to the third solution of the present invention,
The mobile device in a wireless communication system capable of handoff between a first and second wireless system communicating with a base station and a mobile device using different wireless technologies,
In the first area of the first wireless system,
According to the pre-registration execution probability based on the movement probability from the first area to the second area of the second wireless system, which is obtained based on movement route information of a plurality of mobile devices, the mobile device Whether pre-registration processing for exchanging communication information with the second wireless system at the handoff destination via the base station of the first wireless system is performed with the second area as the handoff destination. The mobile device that performs the determination is provided.

  According to the present invention, it is possible to appropriately select the base station that executes the pre-registration process performed before the inter-system handoff and the execution destination base station, and to shorten the handoff processing time.

It is explanatory drawing which showed the execution determination method of the pre-registration by this invention (1st embodiment). It is explanatory drawing which showed the implementation determination method of the pre-registration by this invention (2nd embodiment). It is a figure showing the example of the movement path | route of the moving apparatus between different radio systems. It is a figure showing the example of the movement path information of a some mobile apparatus. It is the figure which showed the example of the operation | movement which a monitoring apparatus determines a pre-registration probability from the movement path information of a mobile station, and notifies each base station. It is the figure which showed the example of the pre-registration probability information at the time of setting one pre-registration destination area. It is the figure which showed the example of the pre-registration probability information at the time of setting a plurality of pre-registration destination areas. It is the figure which showed the example of the handoff probability for every movement path | route. It is the figure which showed the example of the pre-registration probability information including a movement path | route. The system block diagram when not implementing pre-registration. The system block diagram in the case of implementing pre-registration. The functional block diagram of the moving apparatus in 1st embodiment. The functional block diagram of the base station in 2nd embodiment. The pre-registration execution determination flowchart when the pre-registration execution probability is determined for the base station in each area. The pre-registration execution determination flowchart when the pre-registration execution probability is determined for each movement path. Explanatory drawing of pre-registration implementation operation | movement when a moving apparatus moves from the area 101 to the area 111. FIG. Explanatory drawing of pre-registration implementation operation | movement when a moving apparatus moves from the area 100 to the area 111. FIG.

(First embodiment)
FIG. 3 is a diagram illustrating an example of a movement route of the mobile device A for explaining the operation of the present embodiment.
Reference numerals 100 to 101 denote the communication area of the handoff source wireless communication system A that does not permit pre-registration, and reference numerals 110 to 112 denote hand-off source that has a low probability of permitting pre-registration. The communication area of the wireless communication system A, 120 to 121 are the communication areas of the handoff source wireless communication system A in which the pre-registration permission is set higher than 110 to 112, and 200 to 202 are the handoff destination wireless communication systems B communication area. 3 is a service boundary between the handoff source radio communication system A1 and the handoff destination radio communication system B2, and 4 is a movement path of the mobile device A. When the mobile device moves in the direction of the arrow 4 and crosses the boundary 3, handoff from the handoff source wireless communication system A 1 to the handoff destination wireless communication system B 2 is performed.
FIG. 10 shows a system configuration for explaining the operation of this embodiment and a call processing data path when preregistration is not performed.
10 is a mobile station A, 16 is a wireless system A base station, 17 is a wireless system A mobility management device, 18 is a wireless system B base station, 19 is a wireless system B mobility management device, 40 is a monitoring device, and 41 is a backbone network. is there. The base stations 16 and 18 perform data communication using radio with a mobile device. The mobile device management devices 17 and 19 perform call information management and mobile management of mobile devices. The mobile device management devices 17 and 19 also have a function of transferring data to and from the mobile device 10 via the IP network 41. The monitoring device 40 collects call processing operation statistical information from each device in order to grasp the service operation status. The monitoring device 40 may be provided and connected independently for each system, or may be configured in common and connected to both. Reference numeral 13 denotes a call processing data path between the mobile station A and the wireless system A, and reference numeral 14 denotes a call processing data path between the mobile station A and the wireless system B. Call processing data is transferred independently for each system.

FIG. 11 shows a system configuration for explaining the operation of the present embodiment and a call processing data path when preregistration is performed. The system configuration is the same as that in FIG. 10, 13 is a call processing data path between the mobile device A and the wireless system A, and 15 is a call processing data route during preregistration between the mobile device A and the wireless system B. When pre-registration to system B is performed, call processing data is transferred to system B via system A. In the description of this embodiment, when data transfer between base stations is performed, description of processing that passes through the mobility management device is omitted. The transfer between the wireless system A and the wireless system B can be performed using the S101 interface of Non-Patent Document 1, for example.
10 and 11, devices other than mobile devices may be connected via a network device such as a router.
Hereinafter, although one embodiment of the present invention is described based on a drawing, the present invention is not limited to this embodiment.

FIG. 1 is a diagram for explaining the operation of an embodiment of the present invention, which is the first embodiment.
1 is a wireless system A, 2 is a wireless system B system, 10 is a mobile device A that can access both the wireless system A and the wireless system B, 21 is a base station of the wireless system A arranged in the area 111, 22 A base station of the wireless system A arranged in the area 120, and a base station 30 of the wireless system B arranged in the area 200.
FIG. 12 shows a functional block diagram of the mobile device in the first embodiment.
Reference numeral 300 is an antenna, 301 is a receiving high-frequency circuit, 302 is a demodulator, 303 is a data processing unit, 304 is a handoff determination unit, 305 is a preregistration execution determination unit, 306 is a preregistration execution probability table, and 307 is a modulator. , 308 are high-frequency circuits on the transmission side. The mobile device 10 receives a radio signal from the antenna 300, amplifies the received signal by the receiving high-frequency circuit 301, converts the received signal to a predetermined sensitivity, and converts it to a digital signal by an A / D converter. . The demodulator 302 performs demodulation processing on the received signal. The demodulated received data is processed by the data processing unit 303. On the other hand, the transmission data is sent from the data processing unit 303 to the modulator 307 to perform modulation processing. Thereafter, the transmitting high frequency circuit 308 performs processing such as amplification and frequency conversion, and supplies a signal to the antenna 300.
The handoff determination unit 304 measures the SNR (Signal-Noise Ratio) of pilot signals transmitted from a plurality of radio base stations, and performs a process of handing off to a radio base station having a good radio wave condition. Also, it has a function of holding history information of the connected base station. The pre-registration execution determination unit 305 performs pre-registration execution determination using information included in the pre-registration permission notification received from the handoff destination radio base station and the pre-registration probability notification. The probability information received by the pre-registration probability notification is held in the pre-registration execution probability table 306.

A pre-registration execution operation in the embodiment of FIG. 1 will be described.
When the mobile device A 10 performs the operation 50 of moving to the area 111, it receives a pre-registration permission notification 70 and a pre-registration probability notification 71 from the base station 21 of the wireless system A in the area 111. The mobile device A performs the pre-registration execution determination 60 using the information received at 70 and 71. For example, when the pre-registration execution determination result is not executed, the pre-registration is not executed at this time. Details of the pre-registration execution determination will be described later. Next, when the mobile device A performs an operation 51 of moving to the area 120, a pre-registration permission notification 72 and a pre-registration probability notification 73 are received from the base station 22 of the wireless system A in the area 120. The mobile device A makes a pre-registration execution determination 61 using the information received at 72 and 73. For example, if the pre-registration execution determination result is to be executed, pre-registration is performed 74 for the base station 30 of the wireless system B in the area 200 at this time. Mobile device A stores the received preregistration probability in the preregistration execution probability table 306 as appropriate for each area identifier.

The pre-registration execution determinations 60 and 61 in FIG. 1 use the probability information that the monitoring device collects the route information of the mobile device, calculates the pre-registration probability based on the information, and notifies the base station, for example. Do. The mobile device A that has moved on the movement path 4 in FIG. 3 determines whether or not to perform pre-registration according to the pre-registration probability set in advance in the 111 area when it reaches the 111 area. . The execution determination is performed, for example, by calculating a random value. When a probability of 50% is set, a random number value between 0 and 1 is calculated and compared with 0.5. As a result, if it is large, pre-registration is performed, and if it is small, pre-registration is not performed. judge.
The communication area of the pre-registration destination wireless communication system B2 is set to the same area as the handoff destination inferred from the movement route among 200, 201, and 202. If the pre-registration destination area and the actual hand-off destination area are different, the call connection information set up in the base station in the pre-registration destination area by pre-registration is transferred to the base station in the hand-off destination area. This is because there is a possibility that the processing to be performed is required, which causes a long handoff processing time.

FIG. 4 shows an example of an operation in which the monitoring device collects route information of a mobile device, calculates a pre-registration probability for each movement route based on the information, and notifies the base station.
When performing the handoff process of the mobile device, the base station notifies the handoff source base station of the history information of the base station to which the mobile device has been connected as movement path information. The handoff destination base station notifies the monitoring device of the movement path information including its own information. The monitoring device predicts which base station has a high probability of handing off when the mobile device moves from the moving route information, and determines a pre-registration probability.
When the mobile device performs an operation 80 for handing off from the wireless system A base station 20 in the area 101 to the wireless system A base station 21 in the area 111, the wireless system A base station 20 in the area 101 performs the wireless system A base station 21 in the area 111. The operation 90 for notifying route information is performed. The wireless system A base station 21 in the area 111 that has received the route information performs an operation 91 for notifying the monitoring device 40 of the route information.
Similarly, when the mobile device performs an operation 81 for handing off from the wireless system A base station 21 in the area 111 to the wireless system A base station 22 in the area 120, the wireless system A base station 21 in the area 111 performs the wireless system A in the area 120. An operation 92 for notifying route information to the base station 22 is performed. The wireless system A base station 22 in the area 120 that has received the route information performs an operation 93 for notifying the monitoring device 40 of the route information.
When the mobile station performs an operation 82 of handing off from the wireless system A base station 22 in the area 120 to the wireless system B base station 30 in the area 200, the wireless system A base station 22 in the area 120 performs the wireless system B base station 30 in the area 200. An operation 94 for notifying route information is performed. The wireless system B base station 30 in the area 200 that has received the route information performs an operation 95 for notifying the monitoring device 40 of the route information.
The monitoring device 40 performs a pre-registration probability determination operation 64 for each movement route based on the movement route information received from each base station.

FIG. 5 shows an example of movement route information. This indicates that the mobile device is moving in the order of route point A, route point B, route point C, route point D. The movement route of each mobile device is as follows. The mobile devices A, B, C, D, and E move along the routes of area 101, area 111, area 120, and area 200. The mobile devices F and G move along the route of area 100, area 111, area 120, and area 200. The mobile devices H and I move along the route of area 100, area 111, area 121, and area 201. The mobile device J moves along the route of area 100, area 111, area 121, and area 202. The route point on the movement route for each mobile device can be created by storing the identification information of the base station in the above route information notification in the monitoring device 40.
An example of a method for determining a pre-registration probability from travel path information will be shown. The pre-registration probability may be determined for each area base station or may be determined for each movement route.
First, as an example of determining the pre-registration probability for the base stations in each area, an example of determining for the base stations in area 111 is shown.
According to the travel route information in FIG. 5, the probability that a mobile device that has passed through area 111 at route point B will handoff to area 200 at route point D is 7 out of 10 mobile devices A to J. There is a probability of 70%, and handoff to the area 200 is made. Also, the probability that a mobile device that has passed through area 111 at route point B will handoff to area 201 at route point D is two of H to I among the ten mobile devices A to J, with an area of 20% probability. It is handed off to 201. The probability that a mobile device that has passed through area 111 at route point B will handoff to area 202 at route point D is one of G of 10 mobile devices A to J, and will handoff to area 200 with a probability of 10%. Will be.

  Here, when viewing the area arrangement in FIG. 3, the position of the area 111 is far from the service boundary 3 between the wireless communication system A and the wireless communication system B, and the purpose of performing the pre-registration in the area 111 is that the mobile device In an area where high-speed movement is performed all at once, a certain number of mobile stations are serviced to ensure that the pre-registration process is completed for all mobile stations before they reach service boundary 3 between systems. The pre-registration process is completed in an area away from the boundary. Therefore, first, a provisional pre-registration probability for enabling pre-registration in a stepwise manner according to the distance from the area boundary is set. For example, if it is desired to complete pre-registration for 50% of the mobile devices in this area, the provisional pre-registration probability is set as 50%. The provisional pre-registration probability is determined in advance based on the distance between the service boundary 3 of the wireless communication system A and the wireless communication system B and the area where the pre-registration probability is set, whether the area is where high-speed movement occurs, or the like. Can do. From these pieces of probability information, the pre-registration probability is obtained as follows.

Since the total probability of pre-registration in that area is the provisional pre-registration probability, the pre-registration probability for each movement route is calculated by multiplying the provisional pre-registration probability by the movement probability for each movement route. . If one pre-registration area is desired, pre-registration is performed for the base station in the area 200 having the highest handoff probability, and the provisional pre-registration probability of 50% is used as the pre-registration probability. Also good. FIG. 6 shows an example of pre-registration probability information of the area 111 in this case.
When a plurality of pre-registration destination areas are set, the pre-registration probability is determined by multiplying the probability of handoff to each pre-registration destination area by the provisional pre-registration probability. For example, the pre-registration probability for the area 200 is set to 35% by multiplying the hand-off probability 70% for the area 200 by the provisional pre-registration probability 50%. The pre-registration probability for the area 201 is set to 10% by multiplying the hand-off probability of 20% for the area 201 by the provisional pre-registration probability of 50%. The pre-registration probability for the area 202 is set to 5% by multiplying the hand-off probability for the area 202 of 10% by the provisional pre-registration probability of 50%. FIG. 7 shows an example of pre-registration probability information of the area 111 in this case.

Next, an example in which the pre-registration probability is determined for each movement route is shown.
As an example, consider the pre-registration probability for a base station in area 111. According to the movement route information of FIG. 5, the number of mobile devices handed off to the area 200 via the area 101, the area 111, and the area 120 is five of the ten mobile devices A to J A to E, There is a 50% probability that you are handing off this route. Further, the number of mobile devices handed off to the area 200 via the area 100, the area 111, and the area 120 is two of the ten mobile devices A to J, F and G, and this route has a probability of 20%. It ’s a handoff. The number of mobile devices handed off to area 201 via area 100, area 111, and area 121 is two of the ten mobile devices A to J, H and I, with a 20% probability of handoff on this route. Will be. The number of mobile devices handed off to the area 202 via the area 100, the area 111, and the area 121 is one of the 10 mobile devices A to J, and is handed off on this route with a probability of 10%. Will be. FIG. 8 shows the handoff probability for each movement route in this case.

The pre-registration probability is determined by multiplying the handoff probability for each movement path by the provisional pre-registration probability. The provisional pre-registration probability is set for each route point. For example, route point A is 0%, route point B is 50%, and route point C is 100%. From these pieces of probability information, the pre-registration probability for the base station in area 111 is obtained as follows.
Area 111 is route point B, and the provisional pre-registration probability is 50%. Since the base station in the area 111 can only determine the movement route from the route point A, the probability of which area of the route point A to perform preregistration when moving from which area of the route point A is determined. The probability of pre-registration to the area 200 for a mobile device that has moved from the area 101 is obtained by multiplying the 50% probability of handoff to the area 200 via the area 101 at the route point A by the provisional pre-registration probability of 50%. 25%. The probability of pre-registration to the area 200 for a mobile device moving from the area 100 is obtained by multiplying the 20% probability of handoff to the area 200 via the area 100 at the route point A by the provisional pre-registration probability of 50%. 10%. The probability of pre-registration to the area 201 for a mobile device moving from the area 100 is obtained by multiplying the probability of handoff to the area 201 via the area 100 at the route point A by the provisional pre-registration probability of 50%. 10%. The probability of pre-registration to the area 202 for a mobile device moving from the area 100 is obtained by multiplying the probability of handoff to the area 202 via the area 100 at the route point A by 50% of the provisional pre-registration probability. 5%. FIG. 9 shows an example of pre-registration probability information of the area 111 in this case.

In FIG. 4, after the preregistration probability determination 64, the monitoring device 4 performs operations 96, 97, and 98 for notifying the wireless system A base stations 20, 21, and 22 of the preregistration probability information. This probability information is notified to the mobile device A10 by preregistration probability notifications 71 and 73 in FIG.
Next, the pre-registration execution determination process will be described.
FIG. 14 shows a pre-registration execution determination flow when the pre-registration execution probability is determined for the base station in each area.
The flow operation of FIG. 14 will be described in order. The pre-registration execution determination unit 305 of the mobile device A10 (hereinafter the same) starts pre-registration execution determination processing (500). It is determined whether the area is permitted for pre-registration (501). Whether or not it is a permitted area is set in the base station, and the mobile device determines based on the information received in the pre-registration permission notification. If the result of determination in 500 is not permitted, the processing is terminated (511). On the other hand, if pre-registration is permitted, a random number value of 0 to 1 is calculated (502). For example, referring to the pre-registration execution probability table 306, the number of pre-registration destination candidate areas is set to A (503). For example, A = 1 in the example of FIG. 6, and A = 3 in the example of FIG. The number of determination loops is set to i (i is an integer), and an initial value 0 is set (504). Pre-registration destination area identification information B (i) corresponding to i is selected (505). For example, i = 0, 1, and 2 may be set from the top of the pre-registration execution probability table 306. A pre-registration execution determination value for B (i) is calculated and set to C (506). For example, the corresponding pre-registration probability in the pre-registration execution probability table 306 is read and set to C based on the read value. It is compared whether the random value calculated in 502 is equal to or smaller than the determination value C calculated in 506 (507). If the determination result of 507 is correct (the random value is C or less), pre-registration is performed for the area of B (i) (508), and the process ends (511). Otherwise, 1 is added to the loop count i (509). If i is equal to or greater than the number of areas A, the process is terminated (511). Otherwise, the process returns to 505 to select the next area and continue the process.
An example of the pre-registration execution determination operation in the flow of FIG. 14 will be described using the pre-registration probability information shown in FIGS.

When the pre-registration probability information of FIG. 6 is used, since the pre-registration destination area is one of the areas 200, A in step (503) is 1. Since the pre-registration probability for the area 200 is 50%, the determination value C in step (506) is set to 0.5. In step (507), if the random value is 0.5 or less, pre-registration is performed for the base station in area 200, and otherwise, it is determined that pre-registration is not performed.
When the pre-registration probability information in FIG. 7 is used, since the pre-registration destination areas are the three areas 200, 201, and 202, A in step (503) is 3. In step (505), the area 200 to be determined first is selected. Since the pre-registration probability for the area 200 is 35%, the judgment value C in step (506) is set to 0.35. If the random number value is 0.35 or less in step (507), pre-registration is performed for the base station in area 200, otherwise i is updated to 1 in step (509), and step (505) To select the base station of the next area 201. Since the pre-registration probability for the area 201 is 10%, the determination value is set to 0.45 by adding 0.1 to the determination value C in step (506). As a result, 10% of 0.35 to 0.45 is determined. If the random number value is 0.45 or less in step (507), pre-registration is performed for the base station in area 201; otherwise, i is updated to 2 in step (509), and step (505) To select the base station of the next area 202. Since the pre-registration probability for the area 202 is 5%, the determination value is set to 0.5 by adding 0.05 to the determination value C in step (506). If the random number value is 0.5 or less in step (507), pre-registration is performed for the base station in area 202, otherwise i is updated to 3 in step (509). When i is 3, the value is equal to A and satisfies the condition of step (510). Therefore, the pre-registration process is terminated at this point, and the pre-registration process is not performed.

FIG. 15 shows a pre-registration execution determination flow when the pre-registration execution probability is determined for each movement route.
The difference from FIG. 14 is only the process of selecting pre-registration execution probability information that matches the movement route (512). The mobile station holds history information of the base station to which it is connected, and the pre-registration probability information for each route notified by the pre-registration probability notification from the base station is equal to its own mobile route. Select registration probability information.
The operation of step (512) will be described using preregistration probability information shown in FIG.
First, a pre-registration probability information selection operation in the area 111 when the mobile device moves from the area 101 to the area 111 will be described. In the probability information of FIG. 9, when the route point A is routed 101 and reaches the area 111, the pre-registration destination area is only the area 200, and the pre-registration probability is 25%. Therefore, in step (512), this probability information is selected, and the same processing as the flow of FIG. 14 is performed thereafter.

FIG. 16 illustrates the pre-registration execution operation when the mobile device moves from the area 101 to the area 111. The mobile device performs the moving operation 4 from the area 101 to the area 111. When the mobile device moves from the area 101 to the area 111, the pre-registration destination candidate route 6 is only the area 200. If it is determined that the pre-registration is performed as a result of the pre-registration determination, the pre-registration operation 5 is performed on the area 200.
Next, a pre-registration probability information selection operation in the area 111 when the mobile device moves from the area 100 to the area 111 will be described. In the probability information of FIG. 9, when the route point A is routed 100 and reaches the area 111, the pre-registration destination areas are three areas 200, 201, 202, and the pre-registration probabilities are 10%, 10%, respectively. %, 5%. Therefore, in step (512), these pieces of probability information are selected, and the same processing as the flow of FIG. 14 is performed thereafter.
FIG. 17 illustrates the pre-registration execution operation when the mobile device moves from the area 100 to the area 111. The mobile device performs the moving operation 4 from the area 100 to the area 111. When the mobile device moves from the area 100 to the area 111, the pre-registration destination candidate paths 6 are the three areas 200, 201, and 202. If it is determined that the pre-registration is performed for the area 200, for example, the pre-registration execution operation 5 is performed for the area 200.

(Second embodiment)
FIG. 2 is a diagram for explaining the operation of one embodiment of the present invention, which is a second embodiment. In this embodiment, the base station performs the pre-registration execution determination performed by the mobile device in the first embodiment of FIG. By not performing the pre-registration probability notification to the mobile device, it is possible to reduce the amount of traffic transferred wirelessly. The configuration of the wireless system is the same as that of FIG. 3 of the first embodiment.
FIG. 13 shows functional blocks of the base station in the second embodiment.
400 is an antenna, 401 is a receiving high-frequency circuit, 402 is a demodulator, 403 is a line interface, 404 is a handoff processing unit, 405 is a pre-registration execution determination unit, 406 is a pre-registration execution probability table, 407 is a modulator, Reference numeral 408 denotes a transmission-side high-frequency circuit. The base station receives a radio signal from the antenna 400, amplifies the received signal by the receiving high-frequency circuit 401, converts the received signal to a predetermined sensitivity, and converts it to a digital signal by an A / D converter. The demodulator 402 performs demodulation processing on the received signal. The demodulated received data is processed in the base station or transferred to the mobility management devices 17 and 19 via the line interface 403. On the other hand, the transmission data is sent from the line interface 403 to the modulator 407 and modulated. Thereafter, the transmitting high frequency circuit 408 performs processing such as amplification and frequency conversion, and supplies a signal to the antenna 400. The handoff processing unit 404 transfers the history information of the base station to which the mobile device has connected to the handoff destination base station from the handoff source base station via the line interface 403 as movement path information. The handoff destination base station uses the movement path information received via the line interface 403 for preregistration execution determination. The pre-registration execution probability table 406 holds pre-registration execution probability information received from the monitoring device 40 via the line interface 403. The pre-registration execution determination unit 405 uses the value of the pre-registration execution probability table 406 and the movement route information held by the handoff processing unit 404 to determine whether to perform pre-registration for the mobile device. Judgment is made. The base station also has a function of performing pre-registration permission notification and pre-registration rejection notification to the mobile device.

The operation of the present embodiment in the form of FIG. 2 will be described. When the mobile device A 10 performs the operation 50 of moving to the area 111, it receives a pre-registration permission notification 70 from the base station 21 of the wireless system A in the area 111. The mobile device A 10 transmits a pre-registration start request 75 via the base station 21 of the wireless system A in the area 111. When the base station 21 of the wireless system A in the area 111 receives the pre-registration start request 75 of the mobile device A, the pre-registration performed by the mobile device A 10 in the first embodiment of FIG. A pre-registration execution determination 62 similar to the determinations 60 and 61 is performed. If the pre-registration execution determination result is not executed, a pre-registration rejection 76 is notified to the mobile device A10. The mobile station A 10 that has received the pre-registration rejection 76 does not perform pre-registration within the area 111.
When the mobile device A performs the operation 51 of moving to the area 120, the pre-registration permission notification 72 is received from the base station 22 of the wireless system A in the area 120. The mobile device A 10 transmits a pre-registration start request 77 via the base station 22 of the wireless system A in the area 111. The base station 21 of the wireless system A in the area 111 performs the pre-registration execution determination 63 when receiving the pre-registration start request 77 of the mobile device A. If the pre-registration execution determination result is to be executed, pre-registration is executed 74 for the base station 30 of the wireless system B in the area 200 at this time.

(Modification)
In the description of the operation of the first embodiment in FIG. 1 and the second embodiment in FIG. 2, the pre-registration execution determination based on the probability information is performed for all the mobile devices. The purpose of starting the pre-registration process at is to ensure that all mobile stations complete the pre-registration process before the mobile station reaches the service boundary between systems. Therefore, pre-registration processing does not have to be performed in an area away from the service boundary for a mobile device that is stopped or moving at a low speed. Therefore, it is also effective to determine whether to perform pre-registration according to the moving speed of the mobile device. For example, it may be determined that the mobile device is in a stopped state or a low-speed moving state by using GPS information or a gyro sensor, and the pre-registration process may not be performed when the mobile device is away from the service boundary. For example, when the moving speed is smaller than a predetermined speed threshold, the pre-registration process may not be performed. In addition, pre-registration processing may be made difficult, for example, by reducing the provisional pre-registration probability. In addition, you may provide the suitable speed detection part and speed detection apparatus which detect a movement and speed of a moving apparatus. This increases the number of mobile devices that complete pre-registration in the area close to the service boundary, and the call connection information set up in the base station of the pre-registration destination area that occurs when the pre-registration destination area and the handoff destination area are different. It is also possible to reduce the number of occurrences of processing to be transferred to the base station in the handoff destination area.
Further, the provisional pre-registration probability may be determined so that pre-registration execution is not concentrated based on the instantaneous number of pre-registration executions of the base stations in each area. For example, the number of pre-registration executions can be calculated by the monitoring device receiving a pre-registration execution notification from each base station. If the number of instantaneous pre-registration executions in an area is high, The provisional pre-registration probability is set low, and the number of times pre-registration is performed in the area is reduced. Instead, by setting a high provisional pre-registration probability in an area where the number of instantaneous executions is small, the load is distributed so that pre-registration is performed in an area where the number of pre-registration executions is small. This reduces the probability that due to the instantaneous concentration of pre-registration, the mobile device will have to perform an inter-system handoff without pre-registration being completed.

  The wireless communication system according to the present embodiment performs pre-registration according to the distance from the service boundary between systems by probabilistically determining the execution of pre-registration according to the moving route and moving speed of the mobile device. Registration can be started, and the probability that pre-registration is not completed during high-speed movement can be reduced. In addition, the wireless communication system according to the present embodiment reduces the data transfer amount between devices by increasing the probability that the pre-registration destination device and the inter-system hand-off execution destination device are the same, and the inter-system hand-off processing. Time can be shortened.

  The present invention can be used, for example, in a wireless communication system in which a plurality of systems having different standards exist.

1. Wireless communication system A that is the source of inter-system handoff
2 Inter-system handoff destination wireless communication system B
3 Service boundary between wireless communication system A and wireless communication system B 4 Mobile device travel route 5 Pre-registration route 6 Pre-registration candidate route 10 Mobile device A
13 Call processing data path between mobile station A and wireless system A 14 Call processing data path between mobile station A and wireless system B 15 Call processing data path during pre-registration between mobile station A and wireless system B 16 Wireless system A base station 17 radio system A mobile station management device 18 radio system B base station 19 radio system B mobile station management device 20 radio system A base station located in area 101 21 radio system A base station located in area 111 22 in area 120 Arranged radio system A base station 30 Radio system B base station arranged in area 200 31 Radio system B base station arranged in area 201 40 Monitoring device 41 Backbone IP network 50 Operation in which mobile station A moves to area 111 51 Operation of mobile device A moving to area 120 60 An operation in which the motive makes a pre-registration execution determination and determines that the result is not executed 61 An operation in which the mobile device makes a pre-registration execution determination and determines that the result is executed 62 A radio system A base station in the area 111 determines the pre-registration execution 63. Operation for determining that the result is not implemented 63 Radio system A in the area 120 base station performs the pre-registration execution determination and determines that the result is implemented 64 Operation for determining the pre-registration probability 70 Radio system A in the area 111 The operation of notifying the pre-registration permission from the base station to the mobile device 71 The operation of notifying the pre-registration probability from the wireless system A base station in the area 111 to the mobile device 72 The wireless system A base station in the area 120 To the mobile Operation for notifying reregistration permission 73 Operation for notifying pre-registration probability from wireless system A base station in area 120 to mobile device 74 Mobile device A via wireless system A base station in area 120 Operation for performing pre-registration for radio system B base station in area 200 75 Operation for mobile device A to perform pre-registration via radio system A base station in area 111 76 Radio system A base station in area 111 An operation of performing pre-registration rejection notification from the mobile station 77 to the mobile station 77 An operation of mobile station A performing pre-registration via the wireless system A base station in area 120 80 The mobile station from the base station in area 101 to area 111 To handoff to other base stations 81 Mobile station is area 1 Operation for handoff from one base station to base station in area 120 82 Operation for mobile device to handoff from base station in area 120 to base station in area 200 90 Notification of movement path information from base station in area 101 to base station in area 111 91 Operation to perform movement path information notification from the base station in area 111 to the monitoring apparatus 92 Operation to perform movement path information notification from the base station in area 111 to the base station in area 120 93 From the base station in area 120 to the monitoring apparatus Operation for performing movement path information notification 94 Operation for performing movement path information notification from the base station in area 120 to base station in area 200 95 Operation for performing movement path information notification from the base station in area 200 to the monitoring apparatus 96 From area monitoring apparatus to area 101 Of notifying the base station of the pre-registration probability 97 An operation for notifying the pre-registration probability to the base station in the area 98. An operation for notifying the pre-registration probability to the base station in the area 120 from the monitoring apparatus. Areas 110 to 112 Communication areas of the wireless communication system A set with a low probability of permitting pre-registration 120 to 121 Communication areas of the wireless communication system A set with a high probability of permitting pre-registration 200 to 202 Wireless communication system B Communication area 300 antenna 301 high frequency circuit 302 on reception side 302 demodulator 303 data processing unit 304 handoff determination unit 305 preregistration execution determination unit 306 preregistration execution probability table 307 modulator 308 transmission side High-frequency circuit 400 Antenna 401 Reception-side high-frequency circuit 402 Demodulator 403 Line interface 404 Hand-off processing unit 405 Pre-registration execution determination unit 406 Pre-registration execution probability table 407 Modulator 408 Transmission-side high-frequency circuit 500 to 512 Pre-registration execution determination flow Steps

Claims (13)

A wireless communication system capable of handoff between first and second wireless systems communicating with a base station and a mobile device using different wireless technologies,
In the first area of the first wireless system,
According to the pre-registration execution probability based on the movement probability from the first area to the second area of the second wireless system, which is obtained based on movement route information of a plurality of mobile devices, the mobile device Whether pre-registration processing for exchanging communication information with the second wireless system at the handoff destination via the base station of the first wireless system is performed with the second area as the handoff destination. A wireless communication system that performs the determination.   The pre-registration probability is obtained by multiplying the provisional probability preset for each area and the movement probability so that the pre-registration probability decreases as the distance between the area and the boundary between the first and second wireless systems increases. The wireless communication system according to claim 1. A management device that collects movement route information of a plurality of mobile devices via a base station and obtains a movement probability of the mobile device from the first area to the second area based on the movement route information. The wireless communication system according to 1. The management device
Based on the movement route information, a probability of movement of the mobile device moving from the first area of the first wireless system to one of a plurality of second areas of the second wireless system is obtained for each second area, and the first area The wireless communication system according to claim 3, wherein a pre-registration execution probability for each second area in the first area is obtained by multiplying the predetermined provisional probability and the determined movement probability. The management device
Based on the movement route information, one of the second areas of the second wireless system is connected to the first area of the first wireless system via the third area where the mobile device is located in front of the first area and the first area. The mobile device that has moved from the third area to the first area by multiplying the predetermined provisional probability of the first area and the calculated movement probability for each second area The wireless communication system according to claim 3, wherein a pre-registration execution probability for each second area is determined.   The first area is characterized by identifying a third area where the mobile device was located before the first area, and performing the pre-registration process according to a travel route of the mobile device. 5. The wireless communication system according to 5. A speed detection device for determining a moving speed of the mobile device;
The wireless communication system according to claim 1, wherein when the moving speed of the mobile device is smaller than a predetermined threshold value, the pre-registration process is not performed.   The wireless communication system according to claim 1, wherein the mobile device determines whether to perform the pre-registration process.   The radio communication system according to claim 8, wherein the base station has a function of notifying the mobile device of the pre-registration execution probability.   The wireless communication system according to claim 1, wherein the base station determines whether to perform the pre-registration process.   2. The radio according to claim 1, wherein the monitoring device obtains the number of pre-registration executions for each area, and lowers the pre-registration probability for an area where the number of pre-registration executions within a predetermined time is greater than a predetermined threshold. Communications system. In the wireless communication system capable of handoff between the first and second wireless systems communicating with the base station and the mobile station using different wireless technologies, the base station is disposed in the first area of the first wireless system. And
According to the pre-registration execution probability based on the movement probability from the first area to the second area of the second wireless system, which is obtained based on movement route information of a plurality of mobile devices, the mobile device Whether pre-registration processing for exchanging communication information with the second wireless system at the handoff destination via the base station of the first wireless system is performed with the second area as the handoff destination. The base station that performs the determination. The mobile device in a wireless communication system capable of handoff between a first and second wireless system communicating with a base station and a mobile device using different wireless technologies,
In the first area of the first wireless system,
According to the pre-registration execution probability based on the movement probability from the first area to the second area of the second wireless system, which is obtained based on movement route information of a plurality of mobile devices, the mobile device Whether pre-registration processing for exchanging communication information with the second wireless system at the handoff destination via the base station of the first wireless system is performed with the second area as the handoff destination. The mobile device that performs the determination.

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