JP4544276B2 - Mobile communication system - Google Patents

Description

  The present invention relates to a mobile communication system, and more particularly to a mobile communication system that regulates use of a call channel when congestion occurs.

  This type of conventional technology will be described with reference to the drawings.

  FIG. 10 is a block diagram showing an example of a conventional mobile communication system.

  In FIG. 10, this conventional mobile communication system shows the contents disclosed in Japanese Patent Laid-Open No. 10-308978 (Patent Document 1), and the traffic measurement unit 105 of the mobile communication switching system MSC measures the number of accesses to each home memory HM. When this is output as the traffic information TJ, the congestion determination unit 102 adds up the traffic information TJ. When the total result exceeds the processing capacity of the home memory HM, it is determined that the traffic is congested. Thereafter, the regulated ground determination unit 103 determines the regulated ground, and the regulation instruction unit 104 generates a regulation instruction signal that instructs the amount of regulation. When the restriction instruction signal is supplied to the mobile communication exchange MSC to be restricted, the restriction amount distribution unit 106 issues a restriction instruction. The restriction unit 107 of the radio base station BS restricts calls according to the restriction instruction.

JP-A-10-308978

  In this conventional mobile communication system, the home memory HM is controlled under the management of the traffic control device TCE, and the traffic measurement unit of the mobile communication switching system MSC measures the number of accesses to each home memory HM. As a result, the congestion determination unit of the traffic control device TCE determines that the congestion state occurs when the processing capacity to the home memory HM is exceeded. If this congestion state occurs due to a disaster or the like, a call channel may not be secured for an emergency call. There is a problem that there is.

The mobile communication system according to the present invention includes a plurality of base stations that connect a plurality of mobile stations in a radio zone that each provides a service via a radio line, and each of the plurality of base stations that is connected to each other via a wired line. A plurality of base control stations that monitor the use state of each call channel of each of the base stations and control the call, and call signals from the plurality of base control stations are connected to each other or a public telephone network, and the plurality And an exchange having a home memory for storing registration information regarding the plurality of mobile stations provided by a request from the base control station, and each of the plurality of base control stations is registered in the home memory in the base station in charge. that is, a state in which the connection priority all speech channels excluding the contract call channels of the uppermost class is used to conclude that there is a congested state, before Symbol congestion Wherein from a base station for a call from the class of the connection priority class also two of a connection priority under one than the most significant classes, base stations adjacent to the base station of the congestion state is the If it is not in a congested state, use a free call channel of the adjacent base station, and if the adjacent base station is not in the congested state but there is no free call channel, the adjacent base station The call channel used by the oldest or longest call in the radio zone providing the selected call channel is selected so that the selected call channel can be used, and the oldest or longest call in the adjacent base station is selected. As for a call, the call channel of another adjacent base station is shifted.

  In the mobile communication system of the present invention, the number of communication channels that are always contracted with a fire department or police station of a group or group whose connection priority (rank) is registered at the highest level “1” is secured. Therefore, it is possible to reduce communication confusion during a disaster because a call channel is secured in the event of a disaster.

  Next, the present invention will be described with reference to the drawings.

  FIG. 1 is a system block diagram showing a mobile communication system according to first and second embodiments of the present invention.

  1, the mobile communication system according to the first and second embodiments of the present invention has a radio zone (hereinafter referred to as Z) 4-1, and a fire department (F1) 5-1 in Z4-1 has Base station (hereinafter referred to as C) 3-1, C3-2 having Z4-2, C3-3 having Z4-3, and gas company (with Z4-4 in Z4-4) G) C3-4 where 5-3 is located, a base control station (hereinafter referred to as B) 2-1 that manages the usage state of each communication channel of C3-1 to C3-4, and C3 having Z4-5 -5, C3-6 with Z4-6, C3-7 with Z4-7 and the fire department (F2) 5-2 in Z4-7, and Z4 with Z4-8 C3-8 where the electric power company (E) 5-4 is located in B8, B2-2 for managing the use state of each communication channel of C3-5 to C3-8, 1) Registration for calls / connections including the number of contracted call channels, connection priorities, etc. for 5-1, fire department (F2) 5-2, gas company (G) 5-3 and power company (E) 5-4 Connection of home signals (hereinafter referred to as HM) 11 in which information is stored, and call signals B2-1 and B2-2 from B2-1 and B2-2 based on the information in HM11 to each other or to a public communication network In the congested state, the fire station (F1) 5-1, fire station (F2) 5-2, gas company (G) 5-3, and electric power company (E) 5-4 are provided. On the other hand, the number of contracted call channels in the information of the HM 11 is secured, and call restriction is performed so that these calls are preferentially connected.

  FIG. 2 is a schematic diagram illustrating an example of a sector configuration of a zone (Z) of one base station in the mobile communication system according to the first embodiment of this invention.

  2, this schematic diagram shows a sector configuration in the case of a zone (hereinafter referred to as Z) 4-1 of a base station (hereinafter referred to as C) 3-1 shown in FIG. In the case of 3-8, the sector configuration is the same as that of C3-1. In FIG. 2, Z4-4 managed by C3-1 is divided into sectors in six districts of sectors (hereinafter referred to as S) 4-1-11 to 4-1-16.

  This division method is divided by six directional antennas installed in C3-1, and the six antennas are independently mobile terminals in sectors 4-1-11 to 4-1-16. In order to be able to transmit and receive, it has directivity with an interval of about 60 ° centering on C3-1.

  FIG. 3 is a block diagram showing a base control station in the mobile communication system of the first and second embodiments.

  In FIG. 3, this base control station (B) 2 is a diagram showing the case of the first embodiment on behalf of B2-1 and B2-2, and the base station C ( C3-1 to C3-4, or C3-5 to C3-8) are connected by a line (L1 or L2) and interfaced, and the exchange (A) is connected by a line L to interface. An exchange interface unit 22, a storage unit 24 that stores the usage status of the C call channel managed by B2, a display unit 23 that displays the usage status of the call channel in real time, and a user at the time of congestion The message generation unit 25 generates a call restriction message, and the control unit 26 controls connection / disconnection regarding a call input / output to / from B2.

  In the display unit 23, the part of the sector that has become congested as a result of monitoring the usage status of the communication channel of each base station C by the control unit 26 is displayed in red.

  In addition, when a sector of the base station (C) that is in a congested state is generated, the message generating unit 25 receives a voice message and a text message indicating that congestion has been established under the control of the control unit 26. Generated and sent to the caller using the control channel via the base station (C) of the sector that has become congested.

  FIG. 4 is a diagram illustrating an example of a data configuration of a home memory (HM) in the mobile communication system according to the first embodiment.

  In FIG. 4, this home memory (HM) 11 is used to effectively use the entire communication channel of the mobile communication system of the first embodiment and to secure communication in a disaster or the like. F), the number of call channels contracted in advance by the gas company (G) and the power company (E) are stored, and the system configuration is such that the internal information can be viewed by accessing from B2-1 and B2-2. .

  For example, as shown in FIG. 4, the fire department F15-1 is located in the sector (S) 4-1-11 in the wireless zone (Z) 4-1, the number of contracted call channels is 5, and the connection priority Is set to “1” at the top, and the telephone numbers of the five mobile stations owned are 090-1234-5671 to 090-1234-5675, and the unique numbers of the aircrafts are 123456781 to 123456785, respectively.

  As for the connection priority of the mobile communication system of the first embodiment, the highest rank “1” is the fire department, the police station, the second rank “2” is the gas company, the electric power company, the third rank “3” is the hospital, 4th place “4” is assumed to be general.

  The number of contracted call channels is registered in advance in the system and stored in the HM 11.

  In addition, as a condition for determining the congestion of the mobile communication system of the present embodiment, for each of the base control stations (B) 2-1 and 2-2, each sector of each base station (C) to be controlled As a unit, it is assumed that the sector is in a congested state when all usable call channels are in use.

  Even when the call channel is blocked by an illegal telephone or the like and cannot be used, the call channel is put into a condition that it is in use.

  FIG. 5 is a diagram showing an example of a configuration of speech channel usage data stored in the storage unit of the base control station in the mobile communication system according to the first embodiment.

  In FIG. 5, referring to FIG. 1 and FIG. 2, for example, in the sector (S) 4-1-11 of the radio zone (Z) 4-1 managed by the base station (C) 3-1, The fact that the fire department F1 with priority “1” is using the call channel number 3-1-1 is stored in the storage unit 24 of the base control station (B) 2-1, and is also displayed on the display unit 23. Is displayed.

  Therefore, the usage status of the call channel can be viewed in real time on the display unit 23 of B2-1 in units of sectors (S), and the control unit 26 stores data in the storage unit 24 for sectors in a congested state. The outgoing / incoming call restriction process can be performed according to the stored contents.

  The storage unit 24 also stores the presence / absence of congestion for each sector in order to determine the congestion, and the display unit 23 displays, for example, red so that the sector of the base station in a congested state can be known.

  FIG. 6 is a flowchart showing an operation of call restriction when the base control station is congested in the mobile communication system according to the first embodiment.

  Next, the call | restriction control operation | movement at the time of congestion of the base control station in the mobile communication system of this 1st Embodiment is demonstrated with reference to FIGS. 1-5 based on FIG.

  In the mobile communication system of the first embodiment, the number of contracted call channels from public organizations such as fire stations and police stations, and business organizations such as gas companies and electric power companies in the mobile communication system. (That is, the minimum number of contract call channels to be secured) and the minimum number of channels to be secured for general subscribers are registered in advance in units of zones (Z) and sectors (S) as shown in FIG. It is stored in HM11.

  Further, in the mobile communication system of the first embodiment, the total number of call channels (NO) in each sector during normal operation is the number of contract call channels from the public institutions and business groups shown above and general subscribers. More than the total number (n) obtained by adding the minimum number of channels to be secured, that is, NO> n. Furthermore, in the mobile communication system according to the first embodiment, when all the normal number of call channels NO in a normal sector are in use, or when the total number of call channels NO is out of illegal waves, etc. Assume that the sector is in a congested state when the number of call channels N1 excluding the number of call channels that cannot be used is all in use.

  In FIG. 6, the above-described conditions are stored in the HM 11 in advance as shown in FIG. 4. For example, when the control unit 26 of B2-1 detects a call via the base station interface unit 21 ( S11) First, the caller's connection priority (hereinafter, rank) is detected based on the received information, and the fact that a caller rank group has made a call is stored in the storage unit 24 (S12).

  Next, based on the received information, it is checked whether or not the sector that the caller has called is in a congested state (S13). If it is not in the congested state, a call is made to the base station (C) that has the calling sector. A channel is allocated and a speech path is secured (S23).

  If it is in a congested state (S13), the number of call channels currently in use for the caller class is calculated based on the stored information in the storage unit 24 (S14), and then the contract call channel of the rank of the caller The number is checked by accessing the HM 11, and if the number of call channels currently used by the caller is larger than the number of contract call channels, the message generation unit 25 is activated to generate a message indicating that the state is congested. The call is sent to the caller via the control channel (S22), and the call is disconnected (S24).

  If the number of call channels currently used by the caller is less than the number of contract call channels, the number of call channels currently used for each connection priority within the same sector is calculated based on the stored information in the storage unit 24 ( Next, the lowest connection priority (rank) is selected (S17), and it is determined that the number of contract call channels (or the minimum reserved call channels) of that rank is currently in use (S16). S18) When a handoff mobile device in the same sector is selected (S20) and handoff cannot be performed to an adjacent sector (S21), the message generator 25 is activated for the selected handoff mobile device, and in a congested state A message to the effect that there is or that an abnormal situation has occurred is generated and sent to the handoff mobile device (S22), and then the call is disconnected. If handoff to an adjacent sector is possible (S21), the handoff mobile device can continue talking within the handoff destination sector.

  When the selected handoff mobile station moves or disconnects to an adjacent sector, the caller can talk using the call channel used by the handoff mobile station (S23).

  When the number of call channels in use at the lowest rank is less than the number of contract call channels (S18), if the number of call channels in use at the next higher rank is “the number of contract call channels” or less (S18) Then, the same processing as described above is performed, and if it is “less than”, a rank in which the number of contracted call channels is “below” is found for the next higher rank, and the same processing as described above is performed.

  As described above, in the mobile communication system according to the first embodiment, when a call is generated in a congested sector, a contract call of a public institution or a business group or the like registered in advance in this system for each connection priority. Searches for call channels in use in excess of the number of channels in order of connection priority (rank) in order of lowest rank, creates a call channel, establishes a call, and is adjacent to the caller who has used more than the number of contracted call channels Handoff to the sector's call channel.

  By conducting such call regulation, when a fire or the like occurs, an initial call from the fire department or a call within the number of contracted call channels, for example, within the sector, be sure to use the call channel. Can be secured.

  Next, a second embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a system block diagram showing a mobile communication system according to first and second embodiments of the present invention.

  In FIG. 1, the mobile communication system of the second embodiment has a radio zone (hereinafter referred to as Z) 4-1, and a base station (F1) 5-1 in Z4-1 is located ( C ′) 3′-1, C′3′-2 with Z4-2, C′3′-3 with Z4-3, Z4-4 and Z4-4 A base control station (hereinafter referred to as B ′) that manages the usage status of each communication channel of C′3-4 in which the gas company (G) 5-3 is located and C′3′-1 to C′3′-4. ) 2'-1, C'3'-5 with Z4-5, C'3'-6 with Z4-6, Z4-7 and fire department (F2) 5 in Z4-7 -2 where C'3'-7 is located, C'3'-8 where Z4-8 is located and the power company (E) 5-4 is located within Z4-8, and C'3-5 Usage status of each call channel of C'3-8 B'2'-2, which manages the service, contract call channels of the fire department (F1) 5-1, fire department (F2) 5-2, gas company (G) 5-3 and power company (E) 5-4 A home memory (hereinafter referred to as HM ') 11' in which registration information relating to a call / connection including the number, connection priority, etc. is stored, and B'2'-1, B 'based on the information of HM'11' The exchange (A) 1 for connecting the call signals B′2′-1 and B′2′-2 from 2′-2 to each other or the public communication network is provided, and in a congested state, the fire station (F1) 5-1 For fire department (F2) 5-2, gas company (G) 5-3, and electric power company (E) 5-4, secure the number of contracted call channels in the information of HM'11 '. Then, call regulation is performed so that these calls are preferentially connected.

  FIG. 3 is a block diagram showing a base control station in the mobile communication system of the second embodiment.

  In FIG. 3, this base control station (B ′) 2 ′ is a diagram representatively showing B′2′-1 and B′2′-2, and the base station managed by B′2 ′. Base station interface unit 21 which interfaces with C ′ (C′3′-1 to C′3′-4, or C′3′-5 to C′3′-8) via a line (L1 or L2). An exchange interface unit 22 that interfaces with the exchange (A) via a line L; a storage unit 24 ′ that stores the usage status of the C ′ call channel managed by B′2 ′; In addition, a display unit 23 that displays the use state of the call channel in real time, a message generation unit 25 that generates a call restriction message for a user having a low connection priority (rank) during congestion, and a call that is input to and output from B2 A control unit 26 'for controlling connection / disconnection with respect to That.

  The display unit 23 displays the portion of the base station C that has become congested as a result of monitoring the usage status of the communication channel of each base station C by the control unit 26 ′ in red.

  In addition, when the base station (C ′) that is in a congested state occurs, the message generating unit 25 receives a voice message and a text message indicating that the congestion has been determined under the control of the control unit 26 ′. Generated and sent to the caller using the control channel via the base station (C ′) that has become congested.

  FIG. 7 is a diagram showing an example of the data configuration of the home memory (HM ′) in the mobile communication system according to the present embodiment.

  In FIG. 7, the home memory (HM ′) 11 ′ is used to effectively use the entire communication channel of the mobile communication system and to secure communication in a disaster or the like. (G), the number of call channels contracted in advance from the electric power company (E) is stored, and the system configuration is such that it can be accessed from B'2'-1 and B'2'-2 to view internal information. Yes.

  For example, as shown in FIG. 7, the fire department F15-1 is located in the wireless zone (Z) 4-1, the number of contracted call channels is 5 channels, and the connection priority is set to the highest "1". The telephone numbers of the five mobile stations owned are 090-1234-5671 to 090-1234-5675, and the unique numbers of the aircraft are 123456781 to 123456785, respectively.

  The connection priority of the mobile communication system of the present embodiment is the fire station and police station at the highest rank “1”, the gas company and power company at the second rank “2”, the hospital at the third rank “3”, and the fourth rank. “4” is assumed to be general. The number of contract call channels is registered in advance in the system and stored in HM'11 '.

  In addition, as a condition for determining the congestion of the mobile communication system according to the present embodiment, the base control station (B ′) 2′-1 has a communication channel of each base station (C ′) to be controlled. When the number of contract call channels with the connection priority “1” of the fire department F1 is left, it is determined as congestion.

  Similarly, for the base control station (B ′) 2 ′ − 2, it is determined that the call channel of each base station (C ′) to be controlled is congested when the contracted call channel number 5 remains.

  FIG. 8 is a diagram showing an example of a configuration of speech channel usage data stored in the storage unit of the base control station in the mobile communication system of the present embodiment.

  In FIG. 8, referring to FIG. 1, for example, in the wireless zone Z4-1 managed by the base station C'3'-1, the fire department F1 having the connection priority "1" has a call channel number 3-1-. 1 is stored in the storage unit 24 ′ of the base control station (B ′) 2′-1 and is also displayed on the display unit 23.

  Accordingly, the use status of the call channel can be viewed in real time on the wireless zone (Z) unit on the display unit 23 of B′2′−1, and the control unit 26 ′ can generate information according to the stored contents of the storage unit 24 ′. Call restriction processing can be performed.

  The storage unit 24 ′ also stores the remaining number of call channels in order to determine congestion, and the display unit 23 displays, for example, red so that the base station in the congestion state can be known.

  FIG. 9 is a flowchart showing an outgoing call restriction operation when the base control station is congested in the mobile communication system of the present embodiment.

  Next, the operation of call restriction when the base control station is congested in the mobile communication system according to the second embodiment will be described with reference to FIG. 1, FIG. 3, and FIGS. To do.

  The following explanation is based on the case of the base control station (B ') 2'-1. When the control unit 26 ′ of B′2′-1 detects a call via the base station interface unit 21 (S1), the home memory (HM ′) connected to the exchange (A) 1 via the exchange interface unit 22 11 'is accessed, and it is identified whether the connection priority (rank) of the received call is “1” or other than “1” (S32).

  If the rank is “1” (S32), the control unit 26 ′ indicates the congestion state of the base station (for example, C3-1) of the received call as shown in FIG. As a result, if it is determined that the number of contracted call channels other than 5 for the rank “1” in the base station that has received the call is in use, the base station that has received the call recognizes that it is in a congested state (S33). If the rank is “1”, the connection is permitted, the use of one channel in the contract call channel is permitted, and the connection is permitted (S41).

  If the rank is “2”, “3” or “4”, it is determined whether or not the base station (C3-1) receiving the call is in a congested state in the same manner as in the case of rank “1”. (S4) If not in a congested state, use of a free call channel is permitted and call connection is permitted (S41).

  If it is congested, it is determined whether the rank of the outgoing call is “2”, “3” or “4” (S35). If it is an outgoing call of rank “4”, the message generating unit 25 is activated and received. A message indicating that the call channel is currently congested is sent via the control channel to the caller's mobile station via the base station (C'3'-1) that has been sent (S43). Then, the call is disconnected (S44).

  If the outgoing call is of rank “2” or “3”, whether or not there is an adjacent base station that is not congested, for example, (C′3′-2, C′3′-3) is stored in the storage unit 24 ′. This determination is based on the stored information shown in FIG.

  If there is no adjacent base station that is not congested, a message is sent to the caller via the control channel that the call channel is currently congested in the same manner as in rank “4”. Sending out (S43), the call is disconnected.

  If there is an adjacent base station (for example, C′2-2) that is not congested, whether or not there is an empty call channel in C′3′-2 is based on the stored information in the table shown in FIG. (S37).

  If there is an empty call channel, the use of the empty call channel is permitted (S38), and the call connection is allowed.

  If there is no empty channel (S37), the oldest (or longest) call channel in the radio zone (Z) 3-2 of the adjacent base station (S'2'-2) Is selected (S39), use of the selected call channel is permitted (S40), and a call connection is established.

  For the oldest (or longest) caller, the caller moves to an empty call channel in another adjacent base station (for example, C′3′-3 or C′3′-4). Let

  As described above, in the mobile communication system according to the second embodiment, for a fire department or a police station of a group or group whose connection priority (rank) is registered as the highest rank “1”. Since the call channel is secured in the event of a disaster, it is possible to reduce communication disruptions during a disaster by determining congestion as the number of call channels that are always contracted and restricting calls. .

It is a system block diagram which shows the mobile communication system of the 1st and 2nd embodiment of this invention. It is a schematic diagram which shows an example of the sector structure of the zone (Z) of one base station in the mobile communication system of the 1st Embodiment of this invention. It is a block diagram which shows the base control station (B, B ') in the mobile communication system of the 1st and 2nd embodiment. It is a figure which shows an example of a data structure of the home memory (HM) in the mobile communication system of this 1st Embodiment. It is a figure which shows an example of a structure of the speech channel usage data memorize | stored in the memory | storage part of the base control station in the mobile communication system of this 1st Embodiment. 4 is a flowchart showing an operation at the time of congestion of the base control station in the mobile communication system of the first embodiment. It is a figure which shows an example of a data structure of the home memory (HM ') in the mobile communication system of this 2nd Embodiment. It is a figure which shows an example of a structure of the speech channel usage data memorize | stored in the memory | storage part of the base control station in the mobile communication system of this 2nd Embodiment. It is a flowchart which shows the operation | movement at the time of congestion of the base control station in the mobile communication system of this 2nd Embodiment. It is a system block diagram which shows an example of the conventional mobile communication system.

Explanation of symbols

1 Exchange (A)
2,2-1 to 2-2 Base control station (B)
2 ', 2'-1 to 2'-2 Base control station (B')
3-1 to 3-8 Base station (C)
3'-1 to 3'-8 Base station (C ')
4-1 to 4-8 Wireless zone (Z)
5-1 Fire department (F1)
5-2 Fire department (F2)
5-3 Gas Company (G)
5-4 Electricity company (E)
11 Home memory (HM)
11 'Home memory (HM')
21 base station interface unit 22 exchange interface unit 23 display unit 24 storage unit 24 'storage unit 25 message generation unit 26 control unit 26' control unit

Claims (1)

A plurality of base stations that connect a plurality of mobile stations in a radio zone each providing a service via a wireless line, and a communication channel of each of the plurality of base stations connected to each of the plurality of base stations via a wired line A plurality of base control stations that monitor the usage state of the mobile phone and control the call, and call signals from the plurality of base control stations are connected to each other or to the public telephone network, and in response to requests from the plurality of base control stations. An exchange having a home memory for storing registration information regarding the plurality of mobile stations to be provided,
Each of the plurality of base control station, that has been registered in the home memory in the base station that has jurisdiction over all traffic channel connection priority except contract call channels of the uppermost class is using to assert the state that the congestion state, with respect to prior Symbol call from the connection priority class also two of a connection priority under one than the most significant class from the base station in the congestion state If the base station adjacent to the base station in the congested state is not in the congested state, a free speech channel of the adjacent base station is used, and the adjacent base station is not in the congested state, If there is no call channel, the call channel used by the oldest or longest call in the radio zone provided by the adjacent base station is selected and the selected call channel can be used. West Mobile communication system, characterized in that shifting to another speech channel of the neighboring base stations with respect to the oldest or longest call in the base station to the neighbor.

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