JP4930538B2 - Mobile communication system - Google Patents

Description

  The present invention includes a base station, an exchange, a mobile station, and a location management means such as a subscriber database (home location register) for registering the location of the mobile station, and registers the location of the mobile station The present invention relates to a mobile communication system that automatically changes the configuration of an area according to traffic collection and analysis and suppresses invalid location registration requests.

  A mobile communication system is a communication system in which a mobile station can communicate with a fixed subscriber or a mobile station via an exchange, and a plurality of base stations are overlapped so that the radio zones of the base stations partially overlap. Stations are arranged, and a single base station or a plurality of base stations are connected to a base station control station or an exchange including the functions of the base station control station. Further, since the mobile station moves to an arbitrary position, a subscriber database (home location register; HLR) for registering the position of the mobile station is provided, and is configured to be accessible from each switching station.

  A location registration area for registering the location of a mobile station is configured by a radio zone of a single base station or a plurality of base stations, and the base station periodically transmits broadcast information. This broadcast information includes, for example, message type information, network number information, restriction information, control channel structure information, mobile station transmission power designation information, standby permission level information, location registration area multiplexing number information, location information for identifying location registration areas Etc.

  Therefore, the mobile station stores the position information included in the broadcast information in a certain position registration area, compares it with the position information included in the broadcast information when it has moved, and in the case of a comparison match, The location registration request is not sent out because it is determined that it exists in the location registration area, but in the case of a comparison mismatch, it is determined that the location registration area has been moved, and the location registration request is sent out.

  Since this location registration request includes location information for identifying the location registration area, subscriber number, and mobile station number, the location information in the mobile station corresponding area of the subscriber database is updated. As a result, when an incoming call arrives at the mobile station, the location of the mobile station is identified by referring to the subscriber database, and a simultaneous call is made from the base station in units of location registration areas where the mobile station exists.

  The radio frequency between the mobile station and the base station is 800 MHz band or 1.5 GHz band in the case of PDC (Personal Digital Cellular) system, and 1.9 GHz band in the case of PHS (Personal Handyphone System) system. Is used. In the case of a W-CDMA (Wideband Code Division Multiple Access) system, the 2 GHz band is used. The base station wireless zone has a radius of about 500 m or less in a downtown area, for example, and the total number of channels that can be communicated is increased. It is set to about km. The size of the location registration area is selected corresponding to the size of such a wireless zone. That is, a location registration area is configured by a radio zone of a single or a plurality of base stations.

  If this location registration area is reduced, location registration requests are frequently generated according to the movement of the mobile station. On the other hand, if the position registration area is enlarged, a position registration request is not generated until the position registration area is moved to another position registration area. In addition, a call is made when an incoming call is made to a mobile station, but a call is made from a base station in a location registration area where the mobile station is located. In that case, only the call from the base station in the wireless zone in which the mobile station exists is effective, but the call from the other base station is wasted. That is, when the number of base stations included in the location registration area is large, useless calls from base stations in radio zones where no mobile station exists increase.

  For example, in FIG. 18A, when the mobile station MS sequentially moves in the radio zones Z1 to Z4 in the direction of the arrow and moves to the position of MS ′, the location registration areas are set as R1 and R2. In this case, the mobile station MS sends a location registration request at the location registration control point PS corresponding to the boundary between the location registration areas R1 and R2. In that case, when a call is made to the mobile station MS ′ located in the radio zone Z4, the call is made in the radio zones Z2, Z3, Z4 in the location registration area R2 in which the location is registered. Z2 and Z3 are useless calls.

  On the other hand, FIG. 18B shows the case where the location registration areas R1 to R4 are set substantially corresponding to the radio zones Z1 to Z4, and the mobile station MS is in the same way as described above, the position of MS ′. When the mobile station MS moves to, the mobile station MS sends a location registration request at the location registration control point PS corresponding to the boundary between the location registration areas R1 to R4. Therefore, the location registration request is sent out four times. On the other hand, in the case of (A) described above, only one location registration request is required. However, in (B), since the call to the mobile station MS 'located in the radio zone Z4 is performed in the radio zone Z4, useless calls do not occur.

  That is, when the location registration area is enlarged, as described above, the frequency of location registration requests decreases, but the number of unnecessary calls increases. On the other hand, if the location registration area is reduced, the frequency of location registration requests increases, but the number of unnecessary calls decreases. The location registration request is for determining whether or not the user has moved between the location registration areas based on the location information indicating the location registration area included in the broadcast information from the base station, and transmitting the location registration request via the control channel when the user moves. . Therefore, by sending the location registration request, the mobile station consumes power and the usage time of the battery of the portable power source is shortened. In addition, when there are many useless calls, the use efficiency of the base station is lowered.

  Therefore, means for reducing the frequency of occurrence of location registration requests and reducing unnecessary calls has been proposed. For example, by setting a location registration area corresponding to the mobile station based on the history list of the mobile route of the mobile station, even if the mobile station moves within the location registration area corresponding to the mobile station, the location registration request is omitted. be able to. There has also been proposed a means for determining that the location probability of the location registration area that overlaps with the location registration area corresponding to the mobile station is high and making a simultaneous call upon incoming.

  In addition, when the mobile station moves on a highway, a high-speed railway, or the like, location registration requests frequently occur. In view of this, there is also known a means for estimating the moving speed of the mobile station based on the time interval at which the position registration request is generated and suppressing the position registration in the moving process of the high-speed moving mobile station.

  Also, based on the statistical data of the time of stay, it is estimated that the stay probability is high in the area where the stay time is long. Means for reducing ringing are also known. In this case, the mobile station whose power has been turned off after making a location registration request is also included in the location probability.

  In addition, the load amount due to processing related to simultaneous calls and location registration requests is detected for each location registration area, so that the load amount is evenly distributed between location registration areas. A means for changing the configuration of the registration area is known (for example, see Patent Document 1).

  In addition, the number of calling signals is counted for each location registration area, or the number of mobile stations in the location registration zone is counted based on the location registration request signal, and when the count value exceeds the set value, the adjacent location registration area There is also known a means for avoiding load concentration by changing the location registration area configuration by dividing and merging each radio zone.

JP 7-298340 A

  Normal mobile stations each move randomly, but for example, when moving along almost the same movement route, set a virtual location registration area according to the history of the movement route, It is possible to avoid a position registration request during movement along the movement path.

  However, it is practically difficult to set a location registration area corresponding to a mobile station. Further, in the movement by the mass rapid transportation means and the movement at the time of the event, a large number of mobile stations move simultaneously and move so as to concentrate from different directions. In this case, the configuration changing means for the location registration area based on the movement route history cannot be applied.

  In the conventional means for reconfiguring the load amount in the position registration area to be averaged, for example, when part of the position registration area with a high load amount is separated and integrated into the position registration area with a low load amount, Since a large number of mobile stations move and exist in the separated area, a large number of mobile stations in the separated area can be simultaneously integrated by integrating them into the location registration area with a low load. The location registration request is generated. That is, there is a problem that a large number of location registration requests are generated as the configuration of the location registration area is changed.

  An object of the present invention is to analyze the movement tendency of a mobile station, to change the configuration of the location registration area accurately, and to suppress invalid location registration requests accompanying the configuration change of the location registration area.

Mobile radio communication system of the present invention, a switching center connected to a plurality of base stations, the location registration area correspondence from wireless zone of the base station of the multiple, and location management means for managing location information of the mobile station Each of the radio zones corresponding to each of the plurality of base stations included in the location registration area, the area configuration of which can be changed based on the number of location registration requests of the mobile station. aggregates in the located number mobile station, when calling the mobile station has a configuration in which a call to the mobile station from the radio zone serving the number of mobile stations often added up in sequence.

  Also, the channel usage corresponding to the radio zone of the base station is totaled, and when there is a high probability of being in a radio zone where the channel usage is equal to or greater than a predetermined value, the mobile station is called in order from the radio zone adjacent to that radio zone. The structure which performs is provided.

  By determining the mobile station's movement tendency and integrating and separating the location registration areas, the location registration area where the number of location registration requests simply becomes larger is not expanded, but the mobile stations move so as to concentrate. When changing the configuration so that the location registration area is integrated with the location registration area from which the mobile station flows out, if the location registration area before and after movement is different, the location registration area after movement becomes the location registration area before movement. The location registration area after integration and movement becomes an integrated new location registration area, and no location registration request is generated even by movement. In this case, centralized processing of location registration requests when a large number of mobile stations move can be avoided. In addition, by means of regulating the location registration request accompanying the configuration change of the location registration area, the invalid location registration request is regulated when the configuration of the location registration area is integrated or separated, thereby reducing the processing burden on the base station and the switching center. be able to. In that case, based on the ratio between the number of areas in the old location registration area and the number of areas in the new location registration area, the presence / absence of the location registration request is controlled to reduce the number of areas in the old location registration area. At the same time, the restriction can be released and the sudden increase in the location registration requests can be avoided. In that case, the congestion of the location registration request processing of the base station and the switching center does not occur, so that a large number of mobile stations can be accommodated and smooth mobile communication can be performed.

  In addition, there is an advantage that invalid calls can be reduced by making simultaneous calls in the order of the high probability zone when a call is received to a mobile station in a location registration area composed of a plurality of wireless zones. In addition, if a bypass zone is selected in consideration of the channel usage and the channel usage in the high-probability zone is large, it is invalidated by calling the adjacent zone with a smaller channel usage as a bypass zone. Can be reduced.

It is explanatory drawing of a mobile communication system. It is explanatory drawing of a switching center. It is software structure explanatory drawing of a switching center. It is explanatory drawing of a mobile station. It is a sequence explanatory view of position registration control. It is explanatory drawing of the frequency | count of a location registration request | requirement. It is explanatory drawing of dynamic traffic totalization. It is explanatory drawing at the time of the structure change of a location registration area. It is a sequence number collection sequence explanatory diagram between the areas of the location registration control. It is sequence explanatory drawing of the dynamic traffic information collection by position registration. It is sequence explanatory drawing of the dynamic traffic information collection by transmission reception. It is sequence explanatory drawing of the dynamic traffic information collection by incoming call reception. It is an update sequence explanatory view of a location registration area including analysis processing. It is an update sequence explanatory drawing of a location registration area. It is an update sequence explanatory drawing of a location registration area. It is explanatory drawing of invalid call suppression control. It is a call control sequence explanatory drawing of the order of high probability in the area. It is explanatory drawing of a location registration area.

  The mobile communication system of the present invention comprises an exchange station connected to a plurality of base stations, and a location management means for managing location information of the mobile station corresponding to a location registration area composed of a single or a plurality of base station radio zones. The mobile communication system includes a configuration in which the number of mobile stations in the base station corresponding to the wireless zone is counted and the mobile stations are called in order from the high-probability wireless zone when the mobile station is called.

  FIG. 1 is an explanatory diagram of a mobile communication system, where 1 is a mobile station (MS), 2 is a base station (BS), 3 is a switching center, 4 is a subscriber database (HLR), AR1, AR2,. Indicates a location registration area. A mobile communication system including an exchange 3 connected to a plurality of base stations 2 and position information means of the mobile station 1 corresponding to the location registration areas AR1 to ARn consisting of a single or a plurality of radio zones, In accordance with the location registration request, a mobility management table for managing the number of times the location registration request is generated by combining the location registration area before the movement of the mobile station 1 and the location registration area after the movement, and the location registration request generation of this mobility management table The position registration area after the movement whose number of times has exceeded the predetermined value and the position registration area before the movement of the set are all of the position registration area after the movement or one of the position registration areas after the movement adjacent to the position registration area before the movement. And an area integration means for integrating the sections.

  The subscriber database 4 connected to the exchange 3 holds, for example, a subscriber number corresponding to the mobile station 1, a mobile station number, location information of the location registration area where the location registration request is made, billing information, etc. This corresponds to the position management means described above. The switching center 3 includes a base station control function, a speech path setting function, and the like, and can be configured as a device for each function, but is illustrated as an integrated function and includes a plurality of base stations. In addition to being connected to the station 2 and the subscriber database 4, it is connected to another switching center not shown. In addition, each of the location registration areas AR1, AR,... ARn is configured by a single or a plurality of radio zones of the base station 2, and the switching center 3 controls the configuration change by the integration and separation of the location registration areas. In addition, a large number of new location registration requests accompanying the configuration change of the location registration area integration and separation are regulated.

  The switching center 3 also includes area integration means for controlling the configuration change of the location registration area, and collects and analyzes dynamic traffic information such as a location registration request of a mobile station, that is, a simple function within the location registration area. The function to analyze the movement tendency between the location registration areas of the mobile station 1, determine the location registration area to be integrated based on the analysis result, and change the configuration of the location registration area. Is included. For this purpose, a movement management table and the like for counting the number of occurrences of a position registration request are provided by combining the position registration area before movement of the mobile station 1 and the position registration area after movement. In addition, by using the restriction information included in the broadcast information transmitted from the base station 2, a location registration request is issued when the location information of the old location registration area and the new location registration area are different due to the configuration change of the location registration area. It has a control function to regulate. This avoids a sudden increase in location registration requests due to the configuration change of the location registration area.

  The mobile station 1 and the base station 2 have transmission / reception functions corresponding to various communication systems such as the PDC system, the PHS system, and the W-CDMA system, and the base station 2 communicates with the mobile station 1 wirelessly. In addition to the function of performing communication, in accordance with an instruction from the switching center 3, the restriction information for restricting the position registration request based on the change of the position information for identifying the position registration area included in the broadcast information and the position information of the old position registration area And a function of sending to the mobile station 1.

  The mobile station 1 compares the position information for identifying the position registration area included in the broadcast information with the held position information, and sends a position registration request when there is a mismatch. Compared with the location information of the old location registration area of the location registration request regulation specified by the regulation information to be held and the held location information, if there is a match, there is a function that does not make a location registration request . In other words, according to the restriction information, the position registration request is not made even if the old position registration area is moved to the new position registration area.

  FIG. 2 is an explanatory diagram of an exchange, wherein 11, 12 are interface units, 13 is a communication path, 14 is a main control unit, 15 is a main memory, 16 is a communication path control unit, and 4 is a subscriber database (HLR). Show. The base station is connected to the interface unit 11, the subscriber database 4 and the upper exchange are connected to the interface unit 12, and the communication path 13 between the interface units 11 and 12 is controlled by the communication path control unit 16 of the main control unit 14. However, it has a general configuration and function that enables a call between mobile stations or between a mobile station and a fixed subscriber.

  The main control unit 14 has functions such as a dynamic traffic collection unit, a dynamic traffic analysis unit, a location information update control unit, a location registration area configuration change control function, and the like together with a speech path control unit 16 that controls the speech path 13. It has. The main memory 15 also includes areas for various control information and subscriber information necessary for exchange control, and (a) the number of location registration requests for counting the number of location registration requests from mobile stations that have moved between location registration areas. A table, (b) threshold table, (c) in-zone high probability table, (d) detour zone selection table, (e) accommodation condition table, and (f) request table for each base station area.

  FIG. 3 is an explanatory diagram of the software configuration of the switching center, 11 is an event receiving unit for outgoing / incoming calls, 12 is a call connection control unit, 13 is a dynamic traffic control unit, 14 is a dynamic traffic analysis unit, and 15 is a position. An information update control unit, 16 is a speech path control unit, 17 is a billing processing unit, 18 is an event transmission unit, 19 is a command control unit, 20 is an execution management unit, and is formed in the main memory 15 (see FIG. 2). (A) Location registration request frequency table, (b) Threshold table, (c) High probability table in area, (d) Detour zone selection table, (e) Accommodation condition table, (f) Request table for each base station area Shows the path of read R and write W.

  In the case of a location registration request, the dynamic traffic collection unit 13 (a) in the corresponding area of the location registration request count table, based on information received by the event reception unit 11 such as location registration request, transmission, and incoming call. Count up the number of times. That is, the location registration request count table counts the number of location registration requests in an area that is a set of location registration areas before and after movement, and enables determination of movement tendency between location registration areas. Is.

  In addition, based on the base station number that processed the location registration request and incoming / outgoing calls, (b) in the high probability table of the base stations, the radio zones are listed in descending order of the number of base stations corresponding to the radio zones. Stored together with the number of service areas, and based on the usage amount of the channel corresponding to the radio zone, (d) the adjacent radio zone is stored as the detour zone in the detour zone selection table. (F) The number of location registration requests corresponding to the base station area (wireless zone) is stored in the request table for each base station area. The threshold value table (b) is a table in which threshold values are set in the collection and analysis of dynamic traffic information. The (e) accommodation condition table is a table storing setting conditions for the location registration area.

  The dynamic traffic analysis unit 14 is periodically activated by the execution management unit 20, analyzes the collected dynamic traffic information, determines the movement tendency of the mobile station, and is adjacent to a certain location registration area (A). If it is determined that the movement to another location registration area (B) has increased, the location registration area (B) is integrated with the location registration area (A), and the location is changed to an enlarged new location registration area. The information update control unit 15 is activated to change the location information (location registration area (B) to location) in response to the configuration change of the location registration area for the base stations in the location registration area integrated from the event transmission unit 18. (Change of position information to registration area (A)) is instructed. Thereby, the location registration request accompanying the movement from the location registration area (A) to the old location registration area (B) does not occur.

  FIG. 4 is an explanatory diagram of a mobile station, 21 is a duplexer, 22 is a wireless receiver, 23 is a wireless transmitter, 24 is a control processor, 25 is a display, 26 is a speaker, 27 is a microphone, and 28 is a memory. , 29 is an input operation unit, and 30 is a microprocessor. The wireless reception unit 22 and the wireless transmission unit 23 can apply various encoding / decoding configurations and modulation / demodulation configurations that are already known corresponding to the various communication methods described above. Further, the configuration of a known mobile phone or the like can also be applied to the input operation unit 29 such as a numeric keypad, the display unit 25 such as a liquid crystal panel, the speaker 26, the microphone 27, and the memory 28.

  The memory 28 holds location information for identifying a location registration area together with various programs for mobile communication, subscriber number, mobile station number, etc., and location information included in broadcast information from the base station. Is extracted by the control processing unit 24 and compared with the position information stored in the memory 28. If the comparison is inconsistent and the position registration request is not restricted, the position registration request is shared with the wireless transmission unit 23. The position information transmitted from the antenna via the device 21 and stored in the memory 28 is updated to the position information received this time.

  FIG. 5 is a diagram for explaining the sequence of location registration control. The base station periodically transmits notification information including restriction information indicating whether location registration is possible and location information for identifying the location registration area. The mobile station that has moved into the radio zone of the base station compares the position information of the broadcast information transmitted from this base station with the position information held in the memory 28 as described above. A location registration request is sent only when the restriction information indicates that location registration is possible. This location registration request includes a subscriber number MSN (Mobile Subscriber Number) and a mobile station number MSI (Mobile Station Identity).

  The base station transfers the location registration request from the mobile station to the exchange. The switching center sends an authentication information read request to which the subscriber number MSN and mobile station number MSI included in the location registration request are added to the subscriber database, and requests to calculate an authentication random number via the base station Send an authentication request containing In accordance with this authentication request, the mobile station sends out the calculation result of the authentication key and the authentication random number as an authentication response.

  The subscriber database sends out authentication key information as an authentication information response to the authentication information read request from the exchange. The switching center calculates the authentication key and the authentication random number, compares the calculation result with the calculation result as the authentication response from the mobile station, and if the verification does not match, determines that the mobile station is not a contract. To notify the mobile station of location registration rejection. In the case of a collation match, the mobile station is notified of location registration acceptance, and the subscriber number MSN, mobile station number MSI, location information, and routing number PRN (Pursuit Routing Number) are added to the subscriber database. To register the location. The subscriber database updates the location information according to this instruction.

  The above-described location registration request is generated when a mobile station moves between location registration areas or when power is turned on. The number of location registration requests over a 24-hour period at a certain switching center is shown in FIG. There was a tendency to show. In that case, there was a tendency for a hatched region to be seen between certain adjacent location registration areas. In other words, the number of location registration requests increases from 6:00 to 9:00 due to factors such as attendance and start of business, and from 18:00 to 20:00, location registration occurs due to factors such as business termination and return home. The number of requests has increased. That is, it shows that a large number of mobile stations move.

  Therefore, the present invention collects and analyzes dynamic traffic information, performs a configuration change of integration and separation of location registration areas according to the movement tendency of mobile stations, and a location registration request accompanying a configuration change of the location registration area. The location registration request is regulated so as to avoid the rapid increase of the location. This dynamic traffic information is collected by means of, for example, a means for counting the number of location registration requests including the relationship between the location registration area before movement of the mobile station and the location registration area after movement, that is, the movement direction. It can be carried out.

  When the location registration area has a configuration such as, for example, the circled numbers 1, 2, 3,... (Hereinafter, (circled numbers) are added to the numbers and displayed) in FIG. In addition, movement in the direction of arrows a and b between position registration areas (circled numbers) 1 and 2, movement in the direction of arrows c and d between position registration areas (circled numbers) 1 and 4, and position registration area ( FIG. 7B corresponds to the movement in the directions of arrows e and f between the circled numbers) 2 and 4 and the movement in the directions of arrows g and h between the position registration areas (circled numbers) 2 and 5. As shown, the position registration area before movement and the position registration area after movement are totalized. In addition, the area | region totaled with the same code | symbol as an arrow is shown, and it corresponds to the above-mentioned movement management table. This corresponds to the (a) location registration request frequency table in FIGS.

  For example, when there is a position registration request from the position registration area (circled number) 1 to the position registration area (circled number) 2 by movement in the direction of arrow a, the position registration area (circled number) 1 before movement is moved. The area a at the intersection with the subsequent position registration area (circled number) 2 is counted up. Similarly, when there is a position registration request from the position registration area (circled number) 5 to the position registration area (circled number) 2 in the direction of arrow h, the position registration area (circled number) 5 before movement The area h at the intersection point with the position registration area (circled number) 2 after the movement is counted up. Note that movements between other location registration areas are also counted in the same manner.

  Therefore, the total of the position registration areas after movement (circled numbers) 1, 2, 3,... Corresponding to the vertical direction is the position registration areas (circled numbers) 1, 2, 3,. , And the location registration area after movement (circled numbers) 1, 2,... And the position registration area before movement (circled numbers) 2 to 2. It can be seen that the count value of the area at the intersection of 7 indicates a movement tendency between the position registration areas.

  Therefore, as described above, when the number of position registration requests (value of a) due to movement from the position registration area (circled number) 1 to the position registration area (circled number) 2 exceeds a predetermined value, the position registration is performed. It is determined that the movement tendency from the area (circled number) 1 to the position registration area (circled number) 2 has increased, and the position registration area (circled number) 2 after the movement is designated as the position registration area before the movement. (Circled number) The configuration of the location registration area to be integrated is changed as indicated by a one-dot chain line in 1. After that, even if a large number of mobile stations move from the old location registration area (circled number) 1 to the old location registration area (circled number) 2, the integrated new location registration area Since the same position information as the additional number 1 is added to the broadcast information, no position registration request is generated.

  By collecting and analyzing such dynamic traffic information, for example, when it is determined that the movement tendency from the location registration area (circled number) 1 to the location registration area (circled number) 2 has increased, the location registration area ( (Circled numbers) 2 are integrated into the location registration area (circled numbers) 1. In that case, even in the collection of the dynamic traffic information shown in FIG. 7 (B), the position registration areas (circled numbers) 1 and 2 are integrated and tabulated or the old position registration area (circle It is possible to identify the location registration request from the mobile station via the base station for the numbers 1 and 2 from the mobile stations in the old location registration area (circled numbers) 1 and 2 by the subscriber database. Therefore, it is possible to continue collecting the number of location registration requests for each of the old location registration areas (circled numbers) 1 and 2 based on this.

  The number of mobile stations in the old location registration areas (circled numbers) 1 and 2 is the number of incoming and outgoing mobile stations at the base station in each area. For example, when the number of mobile stations in the old location registration area (circled number) 1 before integration is increased after the location registration area configuration is changed, the configuration of the original location registration area may be restored. it can. For example, if the movement tendency from the position registration area (circled number) 1 to the position registration area (circled number) 4 becomes large after the configuration of the position registration area is changed, the position registration area (circled number) 4 is also integrated into the position registration area (circled number) 1, and the old position registration area (circled number) 2 and 4 are set as the position registration area (circled number) 1 of the same position information, and the position registration area (circled) If the number of mobile stations from the old location registration area (circled numbers) 1 to the old location registration areas (circled numbers) 2 and 4 increases rapidly by notifying the location information of the number 1), the location of the mobile station Registration requests can be suppressed.

  In addition, in the case described above, the mobile station in the old location registration area (circled number) 2 before the integration is moved to the new location registration area (circled number) 1 after the integration. Since the position information is received, the position information is different from the held position information. Note that even when the configuration of the location registration area is changed by applying any means, there are mobile stations in which the location information held is different from the location information of the broadcast information. Accordingly, a location registration request is generated from a mobile station in the old location registration area (circled number) 2 as it is. Therefore, to the mobile station in the old location registration area (circled number) 2, broadcast information including the location information of the old location registration area (circled number) 2 and the restriction information on location registration rejection is transmitted. This restricts the occurrence of location registration requests.

  For example, as shown in FIG. 8A, mobile stations a, b, c and d in a location registration area (circled numbers) 1 and mobile stations e and f in a location registration area (circled numbers) 2 If there is a configuration change instruction to integrate the location registration area (circled number) 2 into the location registration area (circled number) 1, as shown in (B), the mobile stations a, b, c, d, e, and f are subordinate to the new location registration area (circled number) 1. The mobile stations e and f in the old location registration area (circled number) 2 are the new location registration area (circled number) 1. According to the location information, a location registration request is generated as described above. Therefore, the location registration request to the new location registration area (circled number) 1 is restricted for the mobile stations e and f under the old location registration area (circled number) 2.

  The restriction information included in the broadcast information transmitted from the base station includes, for example, a priority mobile station location registration enable / disable bit, a priority mobile station transmission enable / disable bit, a general mobile station location registration restriction presence / absence bit, and a general mobile station transmission. Since it has a configuration including a restriction presence / absence bit, restriction group designation, and the like, it is possible to set general mobile station position registration restriction and position information to be restricted by restriction group designation information or the like.

  Therefore, by transmitting the notification information including the position information of the old location registration area (circled number) 2 and the location registration failure, the mobile station that does not move from the old location registration area (circled number) 2 Even if the configuration is changed to the new location registration area (circled number) 1, the location registration request is restricted from being sent out by the restriction information indicating the location registration failure. Thereby, it is possible to avoid a sudden increase in the occurrence of location registration requests due to the configuration change of the location registration area.

  Even if the mobile stations e and f in the old location registration area (circled numbers) 2 do not move after the integration of the location registration areas, operations such as outgoing and incoming calls may be performed. Location registration performed in the process of transmission is not subject to location registration restrictions, and location registration may be performed in the integrated new location registration area (circled number) 1 when the mobile stations e and f transmit. it can. In this case, the location registration does not cause congestion of location registration because the transmission of the mobile station is random.

  Also, as shown in FIG. 8C, when the location ratio of the old location registration areas (circled numbers) 1 and 2 is, for example, 4: 2, it is under the old location registration area (circled numbers) 2. Transmission of restriction information indicating that location registration is rejected to the mobile stations e and f is continued. Accordingly, when the mobile stations e and f exist in the old location registration area (circled numbers) 2 and neither incoming nor outgoing calls are received, the location information of the old location registration area (circled numbers) 2 is continuously held. In addition, the subscriber database is not changed.

  Then, as shown in FIG. 8D, the old location registration is performed by the incoming / outgoing call of the mobile station e under the old location registration area (circled number) 2 or the movement to the old location registration area (circled number) 1. If the ratio of the mobile station f under the area (circled number) 2 and the mobile station a, b, c, d, e under the new location registration area (circled number) 1 is 1: 5, for example, It is determined that the number of mobile stations under the position registration area (numbered circles) 2 has decreased, and the restriction information regarding position registration rejection is cancelled. As a result, the mobile station f also sends a location registration request according to the new location registration area (circled number) 1, and subordinates to the new location registration area (circled number) 1 as shown in FIG. It can be. Such a location ratio can be easily obtained by accessing the subscriber database from the switching center based on the identification number of the calling / receiving base station.

  By collecting and analyzing the dynamic traffic information as described above and dynamically integrating the location registration areas and changing the configuration of separation, for example, the number of location registration requests in the shaded portion of FIG. The location registration area (circled number) shown in 7 (A) is based on the movement of the mobile station between 1 and 2, and the location registration from the location registration area (circled number) 1 in the time zone from 6:00 to 9:00 When it is determined that the movement tendency to the area (circled number) 2 has increased, and the location registration area (circled number) 2 is integrated into the location registration area (circled number) 1, the configuration of this location registration area The position registration request due to the movement from the changed position registration area (circled number) 1 to the position registration area (circled number) 2 is eliminated. As a result, the number of location registration requests in the time zone from 6:00 to 9:00 can be reduced to be the number of location registration requests in the time zone from 0:00 to 6:00.

  In this case, when, for example, 1/10 of the total number of location registration requests is set as a threshold value in the threshold value table in FIG. 2 and FIG. 3, location registration requests due to movement between location registration areas exceeding this threshold value are concentrated. It is possible to change the configuration of the position registration area that integrates the position registration area after movement into the position registration area before movement. In addition, when the number of location registration requests due to movement to the integrated location registration area is smaller than the threshold value smaller than the above-described threshold value, it is possible to change the configuration to restore the location registration area. In addition, with the configuration change due to the separation of the location registration area, the location registration request can be regulated in the same manner as described above. As described above, when the change in the number of location registration requests shown in FIG. 6 occurs during 24 hours, the location registration areas are integrated in the time zone from 6 o'clock to 9 o'clock and from 18 o'clock to 20 o'clock. As a result, the number of location registration requests can be reduced.

  FIG. 9 is an explanatory diagram of a sequence for collecting the number of requests between areas for location registration control, showing a mobile station, a base station, an exchange, and a subscriber database, and sending normal broadcast information from the base station. The notification information includes position information for identifying the position registration area, and the restriction information for restricting the position registration request or the like indicates that position registration is possible. The mobile station compares the position information of the broadcast information with the position information held in the memory 28 (see FIG. 4), and sends a position registration request only when there is a mismatch.

  The base station transfers this location registration request to the exchange. As described above, the location registration request includes the subscriber number MSN and the mobile station number MSI, and the switching center stores the subscriber number MSN and the mobile station number MSI in the subscriber database based on the subscriber number MSN and the mobile station number MSI. An authentication information read request is made to the mobile station and an authentication request including an authentication random number is made to the mobile station. The subscriber database collects authentication key information corresponding to the subscriber number MSN and the mobile station number MSI, and collects old location information and returns it to the exchange.

  The mobile station transmits the calculation result of the authentication key and the authentication random number as an authentication response to the exchange through the base station. The exchange verifies the calculation result of the authentication key and the authentication random number read from the subscriber database with the calculation result from the mobile station, and if the calculation result does not match, it rejects the location registration to the mobile station. Send it out. Further, in the case of collation coincidence, count control of movement from the old position registration area x to the new position registration area y is performed. For example, the moving direction of the mobile station is taken into account by a movement management table that manages the number of occurrences of a position registration request by combining the position registration area before movement and the position registration area after movement shown in FIG. Collect the number of location registration requests.

  Then, the switching center notifies the mobile station of acceptance of location registration, and also includes the subscriber number MSN, mobile station number MSI, location information of the new location registration area, and routing number PRN to the subscriber database. Instruct location registration. The subscriber database updates the location information corresponding to the mobile station that made the location registration request in accordance with the location registration instruction.

  As a means for collecting dynamic traffic information in the switching center, there are a location registration request operation, a call reception operation, and a call reception operation for collecting the number of requests for each operation. 10 shows. That is, until the mobile station makes a location registration request, the same operation as in FIG. 9 is performed, but the switching center counts up the number of times to the request source base station area collection and request table. That is, the base station is identified based on the source address to which the location registration request including the subscriber number MSN and the mobile station number MSI is transferred, and the number of times is counted up in the request table corresponding to the base station.

  Then, the switching center makes an authentication request to the mobile station, makes an authentication information read request to the subscriber database, and responds to a location registration request similar to that shown in FIG. The subscriber database is updated.

  FIG. 11 shows an outline of the operation by the call reception operation. When the mobile station performs a call origination operation, a call origination state report including the calling number, called number, location information, mobile station number MSI, and the like is transmitted. The base station transfers this to the exchange. The switching center identifies the requesting base station based on the originating address of this call accepting operation, and counts up the number of times to the request table corresponding to that base station. Then, mobile station authentication processing is performed, and in the case of an authentication verification match, the called subscriber is called based on the calling party number. These details can be performed by known control. it can.

  FIG. 12 shows the operation by the incoming call reception operation. When the incoming call address signal IAM for the mobile station is added to the switching center, the subscriber station of the destination mobile station is analyzed, the call is instructed to the base station in the location registration area, and the incoming address signal IAM is received. The response signal ACM is sent to the transmitting side. The call from the switching center includes the position information and the mobile station number MSI, and a call signal including the mobile station number MSI is transmitted from the base station in the position registration area designated by the position information.

  The mobile station instructed by the mobile station number MSI sends an incoming radio status report including information such as the mobile station type. The base station sends a general call response including the location information and the mobile station number MSI to the exchange. The exchange collects the request source base station area and counts up the number of times to the request table. In other words, the base station that has received the paging response from the mobile station sends a general paging response to the switching station, and the switching station transmits a request table corresponding to the radio zone of the base station ((f) base in FIG. 2 and FIG. 3). Count the number of times to the request table for each station area. The process of forming a communication path between the called mobile station and the calling subscriber can be performed by already known control.

  FIG. 13 is an explanatory diagram of a location registration area update sequence including analysis processing. After the collection of the dynamic traffic information described above, the switching center proceeds to analysis of the collected dynamic traffic information. This dynamic traffic analysis is performed in the dynamic traffic analysis unit 14 (see FIG. 3) periodically activated by the execution management unit 20 (see FIG. 3). This will be described below.

  That is, execution management is performed periodically (1), a subscriber area list collection request is made to the subscriber database (2), and a subscriber area list response is received from the subscriber database (3), All collation of the location registration request count table (see (a) location registration request count table in FIG. 3 and (B) in FIG. 7) is performed (4), and the location registration request count corresponding to the location registration area in the location registration request count table. It is determined whether or not exceeds a threshold value (5). The threshold value in this case is stored in the threshold value table in FIG.

  If the location registration request count does not exceed the threshold value, the process proceeds to step (15). If the location registration request count exceeds the threshold value, a location ratio is calculated for the location registration area. It is determined whether or not a certain value is exceeded (6). For example, a location ratio (x / y) or (y / x) between the location registration area x and the location registration area y where the number of location registration requests exceeds a threshold is obtained, and (x / y)> a constant value or (y / X)> Determines whether the value is constant. If the location ratio does not exceed a certain value, the process proceeds to step (10). If there is a location registration area where the location ratio exceeds a certain value, it is determined whether or not the location registration area is in a restricted state. (7).

  If the position registration area is not in the restricted state, the process proceeds to step (15), and if the position registration area is in the restricted state of position registration, the process proceeds to position information update control (8). That is, the position state update control unit 15 in FIG. 3 is activated from the dynamic traffic analysis unit 14 and sends an access release request, that is, information for releasing the restriction to the base station (9). The base station transmits the restriction information of the broadcast information as location registration enabled. That is, when the state (B) or (C) in FIG. 8 is changed to the state (D), the restriction is canceled and the state (E) is set.

  In step (10), when the number of location registration requests exceeds the threshold (see step (5)), each location registration request for each of location registration areas x and y in which the mobile station moves relative to each other is obtained. Compare the times X and Y. If X> Y, the location registration area x is integrated into the location registration area y as shown as y → x (11). If X <Y, the location registration area x is shown as x → y. The location registration area y is integrated into (12). Then, position information update control is performed (13). That is, as in step (8), the position information update control unit 15 is activated. Then, a location registration area change request is sent to the base station (14). This location registration area change request includes new location information, restriction information (no location registration for a mobile station holding old location information), and the like.

  In accordance with the location registration area change request, the base station adds location registration failure and location registration failure location information (location information of the old location registration area) as restriction information of the broadcast information. For example, in a mobile station that holds the position information of the old position registration area x integrated with the position registration area y, the position information of the new position registration area is added to the notification information after the configuration of the position registration area is changed. Therefore, the position information is different from the held position information. However, in the case where the location registration rejection information includes, for example, the location information of the old location registration area x, the mobile station in the old location registration area x is located by the control of the control processing unit 24 (see FIG. 4). Do not send registration request. If the location registration is not rejected, a location registration request is sent out. Also, after making the location registration area change request (14), the switching center determines whether or not all areas have been collated (15), and if not, refers to the next location registration area. (16) The process proceeds to step (4).

  Then, the collection result by the dynamic traffic collection unit 13 (see FIG. 3) is analyzed by the dynamically activated dynamic traffic analysis unit 14, and when the analysis result and the configuration change of the location registration area are determined to be necessary, The position information update control unit 15 is activated by designating the pre-change position registration area (old position information) and the post-change position registration area (new position information). The activated location information update control unit 15 may include all base stations belonging to the location registration area integrated by the configuration change or an arbitrary number of base stations adjacent to the location registration area to be integrated and a part of the location registration area to be integrated. Is instructed to change the location registration area.

  The base station instructed to change the location registration area enters the location registration restriction state from the old location information to the new location information, and adds the restriction information including the old location information and the location registration failure to the notification information as described above. And send it out. Therefore, even if the mobile station holding the old position information in the memory 28 (see FIG. 4) moves within the old position registration area for notifying the new position information, the restriction information regarding the old position information and the position registration failure Therefore, the control processing unit 24 (see FIG. 4) does not control the location registration request. With such location registration rejection information, it is possible to avoid frequent location registration requests due to the configuration change of the location registration area.

  In addition, the exchange station has the number of mobile stations holding the old position information (the number of areas in the old position registration area), the number of mobile stations holding the new position information (the number of areas in the new position registration area), Find the ratio. For example, the ratio can be obtained by accessing a subscriber database and collecting mobile stations compatible with old location information and mobile stations compatible with new location information. Then, when the number of mobile stations holding the old location information decreases, the location registration rejection is changed to location registration enabled. As a result, the mobile station holding the old position information sends a position registration request according to the new position information, and manages all as a new position registration area. In that case, since the number of mobile stations holding the old location information is reduced by location registration by an operation such as transmission, location registration requests are not frequently issued.

  14 and 15 are explanatory diagrams for explaining the update sequence of the location registration area, in which the base station transmits the broadcast information with the location information and the restriction information indicating whether or not location registration is possible. The control for comparing the position information and the position information held in the memory 28 (see FIG. 4) by the control processing unit 24 and sending the position registration request due to the comparison mismatch is the same as the case shown in FIG. is there. As described above, when it is determined that the configuration of the location registration area needs to be changed, the location registration area before the change and the location registration area after the change are designated, and the configuration of the location registration area is changed. Thus, the exchange makes a subscriber location list request to the subscriber database.

  The subscriber database as the location management means of the mobile station creates an all-in-service area list of accommodated subscribers and sends the all-in-area list to the exchange. Since this total area list indicates the number of areas corresponding to the position registration area, the switching center can determine the position registration area before the change (old position registration area), the position registration area after the change (new position registration area), Determine the percentage of current subscribers. In general, the ratio of the current subscribers is not large at first.

  Then, a location registration area change request is sent to the base station. This location registration area change request includes old location information, new location information, restriction information (no location registration), and the like. As a result, the integrated base station corresponding to the location registration area adds the restriction information including the location registration failure and the old location information, the new location information, and the like as broadcast information, and sends it out. Then, the base station sends a location registration area change response to the exchange. On the other hand, the base station corresponding to the location registration area to be integrated transmits the same location information as that before the integration to the broadcast information.

  The mobile station compares the holding information (position information held) with the position information of the broadcast information (see FIG. 15), and in the case of a mismatch, in the conventional example, the mobile station makes a location registration request. In the invention, it is determined whether or not location registration is possible, and the holding information (the holding location information) is compared with the location information in the case of location registration failure in the restriction information. Is not sent. However, if the location information indicating that location registration is not held is not held, a location registration request is sent according to the new location information in the notification information.

  The switching center makes a request to collect a subscriber area list in the subscriber database, and returns a list of all areas of the accommodated subscribers to the exchange. The switching center again obtains the ratio of subscribers in the old location registration area and the integrated location registration area. For example, as shown in FIG. 8D, the old location registration area (circled number) When the ratio between the number of subscribers in area 2 and the number of subscribers in location registration area 1 (circled number) 1 after integration is, for example, 1: 5, a deregulation request is sent to the base station. .

  In this way, the base station changes whether or not location registration of restriction information is possible, and sends a restriction release response to the exchange. Since the mobile station holding the location information of the old location registration area (circled number) 2 can register the location, it sends a location registration request according to the location information of the new location registration area (circled number) 1. To do. Thereby, the broadcast information receivable mobile station in the new position registration area (circled number) 1 holds the position information of the new position registration area (circled number) 1. The mobile station can be called from all base stations in the new location registration area including the integrated location registration area, but it can be called from all base stations in a wide range of location registration areas. Instead, an efficient call can be made by applying the means described later.

  FIG. 16 is an explanatory diagram of the invalid call suppression control, where there are a plurality of zones corresponding to the base stations in the location registration area shown in (a), each zone partially overlapping, and integration of location registration areas. In order to reduce unnecessary calls when the area registration area becomes large, pinpoint call control is performed.

  In this case, if the number of areas in the zones A to F is, for example, A = 0, B = 3, C = 5, D = 1, E = 4, and F = 2, the zones are arranged in the order of the high probability of being in the area. At this time, C> E> B> F> D> A. Accordingly, the high-in-zone probability table shown in (b) (see (c) in FIGS. 2 and 3) stores C, E, B, F, D, and A in descending order of the in-zone probability. For example, the number of areas in service can be determined by, for example, determining the number of areas in the zone corresponding to the operation (location registration request, incoming call, outgoing call) of the mobile station described above, and using the dynamic traffic information Can be created.

  Since there is a concern about the tightness of the number of channels in the zone with a high probability of being in the service area, it is necessary to use the channel by utilizing the overlap of the zone configuration so that the operation from the mobile station side can be preferentially performed. A bypass zone selection table (see FIG. 2 and FIG. 3D) for managing the situation and a list of adjacent zones as bypass zones corresponding to the zone is formed as shown in FIG. That is, for zone A, B and n are selected as bypass zones, and for zone B, A and C are selected as bypass zones. In addition, although the case where the base stations are arranged in the horizontal direction is shown, since it is generally arranged in a mesh shape, an adjacent zone with a small channel usage is selected.

  When a call to a mobile station is received in each zone in the location registration area, only the in-zone zone is valid and other zones are useless calls. Therefore, referring to the located high probability table, calls are made in order from the zone having the highest visited probability (in this case, zone C). When the channel usage amount of the zone is large, the bypass zone is selected and a call is made (in this case, zone B or D). Therefore, since a call is made by selecting a zone with a high probability of being located and a small amount of channel usage, it is possible to call a mobile station without obstructing the operation of the mobile station and reducing unnecessary calls. It becomes.

  In addition, when calling sequentially from a zone with a high probability of being located, the calling of a zone with a high probability of being visited is started while continuing to call a zone with a high probability of being located. It is also possible to make a call for each zone, and it is also possible to make a call sequentially from a zone with a high probability of presence corresponding to each zone.

  FIG. 17 is an explanatory diagram of the call control sequence in the order of high probability of being in the service area. The exchange performs analysis of the incoming subscriber state by the incoming address signal IAM (21) and sends out a response signal ACM. Then, all base station areas (zones) in the location information (location information) are listed (22), and a location high probability table as shown in FIG. Call control is executed in order (23).

  In that case, it is determined whether or not the CH (channel) usage status of the selected zone is equal to or greater than the reference value (24). If the CH is used, the detour zone selection table as shown in FIG. Then, an adjacent zone is selected (25) and a call is made. Then, it is determined whether or not the calling control has been performed for all the selected zones (26). If not completed, the process proceeds to step (23).

  If the channel usage of the selected zone is less than or equal to the reference value, call control is performed for the selected zone, and it is determined whether or not all the call control is performed for the selected zone (27 ) If not completed, it is determined whether or not a call response has been received (28). If no call response has been received, the process proceeds to step (23). When a call response is received, all the base stations (zones) that have made a call other than the simultaneous call response reception are extracted (29), and it is determined whether or not all the selected zones have been executed (30). If not completed, the process proceeds to step (29).

  The call information from the exchange station to the base station includes position information and the mobile station number MSI and the like, and the call from the base station to the mobile station includes the mobile station number MSI and the like. In response to this, the mobile station sends an incoming radio status report including mobile station type information, etc., and the base station sends a paging response including the mobile station location information and mobile station number MSI to the exchange. .

  The present invention is not limited to the above-described embodiments, and various additions and changes can be made, and the configuration is changed to a new location registration area obtained by sequentially integrating adjacent location registration areas. In this case, it is possible to sequentially separate the zones according to the ratio of the number of areas in each zone. When various location registration areas are integrated, broadcast information to which the location information of the integrated location registration area is added is sent to the mobile stations in the integrated location registration area. It is possible to regulate the location registration request for. By this restriction, it is possible to avoid congestion of location registration requests when integrating location registration areas.

1 Mobile station (MS)
2 Base station (BS)
3 Switching office 4 Subscriber database (HLR)
AR1-ARn Location registration area

Claims (2)

Corresponding to a location registration area composed of radio zones of a plurality of base stations connected to a plurality of base stations, a location registration area before the mobile station and a location registration after the movement according to the location registration request of the mobile station In a mobile communication system including location management means for managing the number of occurrences of location registration requests as a group with an area ,
The location registration area before movement occurrences of position registration request of the switching center the mobile station location registration area and set after movement exceeds a predetermined value, the location registration area after the mobile whole or before movement Number of mobile stations in each radio zone corresponding to each of the plurality of base stations included in the location registration area that can be changed by integrating a part of the location registration area after movement adjacent to the location registration area A mobile communication system, comprising: a mobile station that calls a mobile station in order from a radio zone having a large number of mobile stations in the total area when the mobile station is called.   The channel usage in each radio zone corresponding to each of the plurality of base stations is totaled, and when the total usage is greater than or equal to a predetermined value, the mobile station in the radio zone adjacent to the radio zone The mobile communication system according to claim 1, further comprising a configuration for performing a call.

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