MXPA00003739A - System and method for restricting mobility of subscribers assigned to fixed subscription areas in a cellular telecommunications network - Google Patents

Abstract

A system and method ofrestricting an on-going call of a fixed subscriber to a fixed subscription area (FSA) in a cellular telecommunication system (10) having a plurality of cells (C1-C10) and a plurality of subscribers (M1-M10). The plurality of subscribers (M1-M10) includes at least one fixed subscriber assigned to the FSA and engaged in an on-going call in a serving cell. The system and method detect when the fixed subscriber is crossing a cell border between the serving cell and a neighbor cell, determine whether the neighbor cell is located outside the FSA, and drop the on-going call of the fixed subscriber upon determining that the neighbor cell is located outside the FSA.

Description

SYSTEM AND METHOD FOR RESTRICTING MOBILITY OF SUBSCRIBERS ASSIGNED TO FIXED SUBSCRIPTIONS, IN A CELLULAR TELECOMMUNICATIONS NETWORK BACKGROUND OF THE INVENTION TECHNICAL FIELD OF THE INVENTION This invention relates to cellular radio telecommunications systems and, more specifically, to a system and method for restricting the mobility of subscribers assigned to fixed subscription areas (FSA) in a mobile cellular network. telecommunications Description of the Related Art As the use of cell phones is extended, the number of network operators competing to provide telecommunications services to subscribers also increases. Each operator, in addition, wishes to offer unique services that distinguish the operator from its competitors. One of these ways of distinguishing the service provided to the subscribers is to offer increased levels of individual service design. At present, only limited designs of individual services have been made. For example, operators can now offer subscribers a choice of subscription areas such as having cellular service only in a central area, or at a higher cost, having a service that includes both the central area and the surroundings. Subscribers with geographically limited access rights are known as "fixed subscribers" and are generally equipped with a fixed cellular terminal or a mobile station.A major problem with existing methods of limiting individual services to a geographic area is that the limits are only effective in the access to the system, that is, the origin or termination of the call The existing cellular systems perform a verification process to determine if a subscriber is authorized to place or receive a call from the cell in which the subscriber is located, but the verification process is only done in access to the system, existing systems do not perform automatic subscriber verification, therefore, once a fixed subscriber places a call in an authorized geographical area, the subscriber can continue the call, even if the subscriber leaves the authorized area (roaming), so once a call is in progress, a subscriber Fixed 'can go from cell to cell throughout the coverage area of the network. System operators of course lose revenue when fixed subscribers pay a lower rate for a restricted subscription area and then freely switch to unauthorized areas once the calls are started. However, this unauthorized roaming also causes another serious problem. The cellular system is programmed with information that indicates that a fixed subscriber is limited to operate within the subscriber's restricted or fixed subscription area (FSA). For purposes of the present invention, an FSA is defined as one or more cell regions within which fixed subscribers are allowed to roam and receive and place calls. The cells can all be of equal size, or they can be of different sizes. When a voice channel is assigned to a fixed subscriber, the cellular system may also assign the same channel or channels adjacent to the subscribers in areas outside the fixed subscriber's FSA. If the fixed subscriber remains within the authorized FSA, normally there is no problem. However, if the fixed subscriber moves (roaming) outside the authorized FSA, there is a greater opportunity for interference of the co-channels and adjacent channels between authorized subscribers in this area and the unauthorized fixed subscribers. For a cellular system to control fixed subscribers and mobile subscribers, the system must be able to identify each type of subscriber and access information in relation to each authorized FSA of the fixed subscriber. The European Patent Application 0 505 106 A2 of Vodafone (Vodafone) uses the "classmark" (RF transmitter power) of the mobile station of the subscriber to distinguish a regular mobile station from a microcellular mobile station. In this way, the Vodafone system is alerted if a microcell subscriber tries to access the network in a cell that is not a microcell. However, Vodafone's method of using the classmark is useless when the cells in the FSA and adjacent cells are of equal size. In addition, when required, cellular systems should be prohibited from subscriber-free operation of cells outside their FSA. For fixed subscribers with subscription areas comprising a single cell, this means that the system may not allow free operations of these subscribers. Cellular systems must, at the same time, allow fixed subscriber-free operations between authorized FSA cells comprising more than one cell, while cell-free operations outside of FSAs are prohibited. Meanwhile, normal (unrestricted) mobile subscribers must be able to move freely to any cell of their choice. To avoid co-channel interference and adjacent channels between fixed subscribers of a single cell, fixed subscribers of multiple cells, and mobile subscribers with unrestricted mobility, a mechanism is necessary to limit the mobility of fixed subscribers after it is initiated a call. It would be a distinct advantage to have a cellular radio telecommunications system with the ability to identify and disconnect calls from fixed subscribers who travel outside of their authorized FSAs after a call is initiated, and enter cells of equal size. In addition, it would be advantageous for a cellular system to provide a warning to the fixed subscribers during the call that their call can be disconnected. The present invention provides such a system.

COMPENDIUM OF THE INVENTION In one aspect, the present invention is a cellular telecommunications system that detects subscribers that cross limits of free operation and allows an automatic function or disables the automatic function and disconnects the call. In another aspect, the present invention is a cellular telecommunications system having a plurality of cells and a plurality of subscribers using cell phones of radio frequency transmitter power approximately equal to have access to the cellular system. The plurality of subscribers includes at least one fixed subscriber assigned to a fixed subscription area (FSA) connected in a continuous call on a serving cell. The system includes a mobile switching center (MSC) which includes a database defining which of the plurality of cells are included in the FSA, and a residence location register (HLR) that stores a subscriber profile for each of the plurality of subscribers. Each subscriber profile identifies whether an associated subscriber is a fixed subscriber or a normal subscriber. The system also includes means for sending a query from the MSC to the HLR to determine whether a subscriber is a normal subscriber or a fixed subscriber. A plurality of base stations are electronically connected to the MSC, each of the base stations transmitting radiofrequency signals over a coverage area defining one of the cells, and receiving radio frequency signals from cell phones of approximately equal radio frequency transmitter power. Finally, the system includes a restricted mobility function to restrict the in-process call from the fixed subscriber to the FSA. In another aspect, the present invention is a cellular telecommunications system having a plurality of cells and a plurality of subscribers. The plurality of subscribers includes at least one fixed subscriber assigned to a fixed subscription area (FSA) connected in a call in progress in a serving cell. The system includes a mobile switching center (MSC), and a plurality of base stations electronically connected to the MSC and transmitting radiofrequency signals over coverage areas defining the cells. The areas of coverage of the cells within the FSA, and the cells that limit the FSA, can be approximately equal in size. The system also includes a restricted mobility feature to restrict the in-process call from the fixed subscriber to the FSA. In another aspect, the present invention is a method in a cellular telecommunications system for restricting a call in the process from a fixed subscriber to a fixed subscription area (FSA). The cellular telecommunications system includes a mobile server switching center (MSC), a residence location register (HLR), a plurality of cells, and the FSA. The method begins by receiving radio frequency transmissions from a plurality of subscribers using cell phones of approximately equal radio frequency transmitter power to gain access to the cellular system. The plurality of subscribers includes the fixed subscriber assigned to the FSA. The method also defines, in a subscriber profile stored in the HLR, whether each of the plurality of subscribers is a fixed subscriber assigned to the FSA. This is followed by detection when one of the plurality of subscribers is crossing a cell boundary between a serving cell and a neighboring cell, sending a query from the serving MSC to the HLR to determine if the subscriber crossing the boundary of the cell is a fixed subscriber assigned to the FSA, and determine, from a database in the MSC if the adjacent cell is located in the FSA. This is followed by dropping the call in process of the fixed subscriber with the determination that the subscriber crosses the cell boundary is a fixed subscriber assigned to the FSA and the adjacent cell is located outside the FSA.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood and its numerous objectives and advantages will be more apparent to those skilled in the art with reference to the following drawings, together with the specification that accompanies it, in which: FIGURE 1 (prior art ) is a block diagram illustrating the components of a cellular radio telecommunications system associated with the present invention; FIGURES 2A and 2B are flow charts illustrating the functions performed by the present invention when the mobility of a fixed subscriber is restricted; and FIGURES 3A and 3B are a flow chart illustrating the functions performed by the Cali Our of Cell process in parallel with the functions illustrated in FIGURES 2A and 2B.

DETAILED DESCRIPTION OF THE MODALITIES The present invention comprises a cellular radio telecommunications system that detects subscribers crossing limits of free operation and enables an automatic function or disables the automatic function and drops the call.

The decision of automatic transfer or drop the call depends on the status of the subscriber, if a restricted mobility function is active in the subscriber's server cell, the limit that is being crossed, and the number of times the system detects the subscriber in the limit of free operation within a predetermined period of time. A new restricted mobility function that includes a "Cali Out of Cell" process enables the cellular system to perform these activities. The function detects a fixed subscriber crossing a limit of free operation with the reception of an inter-cell automatic transfer request. However, instead of performing the automatic transfer of the subscriber, the function waits for a predetermined time defined by the operator, and then determines whether or not to disconnect the call. If a call is an emergency call, or a call to an operator, the Cali Out of Cell process can be disabled for the duration of the call. Referring first to FIGURE 1, a conventional cellular radio telecommunications system 10 of the type to which the present invention may, in general, belong, is illustrated. In FIGURE 1, an arbitrary geographic area can be divided into a plurality of continuous radio coverage areas, or Cl-ClO cells. Although the system in FIGURE 1 shows only 10 cells as an illustration, it should be clearly understood that in practice the number of cells would be much greater. Associated with and located within each of the Cl-ClO cells is a base station designated as a corresponding one of a plurality of base stations B1-B10. Each of the base stations B1-B10 includes a transmitter, receiver, and a base station controller as is well known in the art. In FIGURE 1, the Bl-B10 base stations are selected to be located in the center of each of the Cl-ClO cells, respectively, and are equipped with omnidirectional antennas. However, in other configurations of a cellular radio transmission system, stations B1-B10 may be located near the periphery, or otherwise away from the centers of Cl-ClO cells and may cover the Cl-ClO cells with Radio signals in omnidirectional or directional form. Therefore, the representation of the cellular radio transmission system of FIGURE 1 is for purposes of illustration only and is not intended as a limitation of the possible implementations of a mobile radio telecommunications system within which a mobility restriction process may be performed. . Continued with reference to FIGURE 1, a plurality of MI-MIO mobile stations will be located within the Cl-ClO cells. Again, only 10 mobile stations are shown in FIGURE 1, but it should be understood that the actual number of mobile stations will be much larger and, in practice, will invariably greatly exceed the number of base stations. In addition, the MI-MIO mobile stations are illustrated in some of the Cl-ClO cells. The presence or absence of mobile stations in any of the Cl-ClO specific cells should be understood to depend, in practice, on the individual wishes of the subscribers using the MI-MÍO mobile stations. The subscribers can move from one location in a cell to another, or from one cell to an adjacent cell or neighboring cell, and even from a cellular radio system served by a mobile switching center (MSC) 11 to another system while receiving and places calls within the cellular system 10, as well as the public switched telecommunication network (PSTN) 12 that is connected to the MSC 11. Each of the MI-MIO mobile stations is capable of initiating or receiving a telephone call through one or more of the base stations B1-B10 and the MSC 11. These calls can be for voice or data communications. The MSC 11 is connected by communication links 13 (for example cables) to each of the illustrative base stations B1-B10 and the PSTN 12 or a similar fixed network which may include a facility (not shown) of the digital service network. Integrated (ISDN). The relevant connections between the MSC 11 and the base stations B1-B10, or between MSC 11 and PSTN 12 are not fully shown in FIGURE 1 but are well known to those skilled in the art. In the same way, it is also known to include more than one mobile switching center (MSC) in a cellular radio system and to connect each additional MSC to a different group of base stations and to other MSCs by cables or radio links. Each of the Cl-ClO cells is assigned to a plurality of speech or speech channels and at least one access or control channel, such as a forward control channel (FOCC). The control channel is used to control or monitor the operation of the mobile station by means of the information transmitted and received from these units, known as messages. The control and administration messages within a cellular radio system are sent in accordance with the standards of the area interface established by the industry, such as the AMPS and EIA / TIA 553 standards, the standards for analog cellular operations, and / or D-AMPS, IS-54B, and IS-136, standards for digital cellular operations, all of which are incorporated herein by reference. Although these standards govern North American operations, standards in the like govern other geographic areas throughout the world, and are well known to those skilled in the art. Information exchanged between base stations and mobile stations through messages may include incoming call signals, outgoing call signals, paging or location signals, location response signals, location registration signals, voice channel assignments, maintenance instructions and automatic transfer instructions as the mobile stations travel outside the radio coverage of one cell and to the radio coverage of other cells, as well as other additional information elements such as calling party numbers, weather information , and similar. The control or voice channels can operate in analogue or digital mode or a combination thereof based on industry standards. Integrated services between different cellular telecommunications systems are provided using the intersystem specification ANSI-41, which is incorporated herein by reference.

In cellular telecommunications systems in which most of the control functions are centralized in the MSC 11, the restricted mobility function can be implemented in the MSC. In cellular telecommunications systems in which the control functions are more distributed, the restricted mobility function can be partially implemented in the MSC 11, and partially in the base stations B1-B10 of the system. The description herein focuses on implementation in an MSC 11, although a distributed implementation is also considered within the scope of the invention. FIGURES 2A and 2B are a flow diagram illustrating the functions performed by the present invention when the mobility of a fixed subscriber is restricted. In step 21, a subscriber in a cellular telecommunications system is connected to a call and approaches a cell boundary. The subscriber may use a mobile station having approximately the same power of the radio frequency (RF) transmitter as all other subscribers, or the power levels may be different, since the present invention does not use RF transmitter power or class marks. to differentiate a fixed subscriber from an unrestricted subscriber. In the same way, the cells within the FSA and the border cells of the FSA can be of equal size, or different size, since the present invention can restrict subscribers to cells of any size. In step 22, the process determines whether or not the subscriber is assigned to a fixed subscription area (FSA) (ie, whether the subscriber is a fixed subscriber). The MSC includes a database defining which of the cells in the coverage area of the MSC are included in the MSC. In addition, the MSC may have access to a subscriber profile stored in a residence location register (HLR) associated with the MSC to determine whether the subscriber is classified as a fixed subscriber. If it is determined that the subscriber is not a fixed subscriber, and therefore is not assigned to an FSA, then the subscriber is a fully mobile (unrestricted) subscriber, and the process moves to step 23 and allows automatic transfers to any cell adjacent. The process then ends in step 24. However, if it was determined in step 22 that the subscriber is a fixed subscriber, the subscriber is restricted to the FSA defined by the MSC if the restricted mobility function is activated. Each system operator can choose whether to restrict the mobility of fixed subscribers connected in calls; therefore in step 25, the process determines from the MSC whether the restricted mobility function is active or not in the subscriber server cell. If restricted mobility is not active, the process moves to step 23 and allows automatic transfers to any adjacent cells. The process then ends in step 24. However, if the MSC indicates that restricted mobility is active in the subscriber's cell, then the process moves from step 25 to step 26 where it determines whether automatic transfers are allowed or not. by the operator to adjacent cells that are part of the FSA. If automatic transfers are not allowed, the process moves to step 27 and performs an automatic transfer evaluation to detect if the subscriber is crossing a cell boundary. The present invention operates with cells of any size. It is not limited, for example, to restrict subscribers with microcellular mobile stations to microcells. Both the serving cell and the adjacent cell can be macrocells, both can be microcells, or there can be one of each type. Thus, mobile stations of any power level can be restricted to cells of any size using the present invention. The process detects a cell boundary crossing by determining in step 28 whether or not the neighboring cell is a better cell to serve the mobile station than the current serving cell. This determination can be made by measuring the relative intensities of the signal between the mobile station and the base station of the neighboring cell, and between the mobile station and the base station of the currently serving cell. The determination can also be made based on any other measure of voice quality such as, for example, the erroneous bit rate, the interference level or the carrier to interference ratio (C / I). In digital cellular systems, the evaluation of the automatic transfer can be performed at the serving base station, with the results sent to the MSC. In analog cellular systems, the serving base station evaluates the quality of the server channel and sends the results to the MSC. The MSC then performs the evaluation of the automatic transfer. If it is determined in step 28 that the neighbor cell is not better than the serving cell, then the subscriber has not crossed the cell boundary, and no action is taken. The process returns to step 28 and continues to perform automatic transfer evaluations until it is determined in step 28 that the neighbor cell is better than the serving cell. With a determination that the neighbor cell is better than the serving cell, the process moves to step 29 (FIGURE 2B) where an out-of-cell tone is sent to the subscriber to notify the subscriber that he has left his serving cell. The process then moves to step 30 where an inter-cell automatic transfer request counter is incremented. The process then moves to step 40 where it determines whether or not to initiate the Cali Out of Cell process of the restricted mobility function. If it is determined that the Cali Out of Cell process is initiated, the process returns to step 27 (FIGURE 2A) and continues the evaluation of the automatic transfers. If the Cali Out of Cell process is not started, the process moves to step 50 and starts the Cali Out of Cell process. The process then returns to step 27 and continues the evaluation of automatic transfers. If in step 26 (FIGURE 2A) it is determined that the automatic transfers are allowed by the operator to adjacent cells that are part of the FSA, then the process moves to step 31 and performs an automatic transfer evaluation to detect whether the subscriber is crossing a cell limit. The process detects a boundary crossing by determining in step 32 whether or not the neighboring cell is a better cell to service the mobile station than the currently serving cell. If it is determined in step 32 that the neighbor cell is not better than the serving cell, then the subscriber has not crossed the cell boundary, and no action is taken. The process returns to step 31 and continues to perform automatic transfer evaluations until it is determined in step 32 that the neighboring cell is better than the serving cell. With a determination that the neighboring cell is better than the serving cell, the process moves to step 33 (FIGURE 2B) where it is determined whether or not the neighboring cell is part of the subscriber's FSA. If the neighbor cell is part of the FSA, then the process moves to step 34 and allows automatic transfers to the neighboring cell. The process then ends in step 35. If the neighbor cell is not part of the FSA, then the process moves to step 36 where the subscriber is sent a notification tone outside of FSA. For subscribers with FSA comprising a single cell, of course, there are no neighboring cells that are part of the area. Therefore, the process always sends subscribers of a single cell a notification tone when they are detected crossing the cell boundary. The process then moves to step 37 where an inter-cell automatic transfer request counter is incremented. The process then moves to step 38 where it is determined whether or not the Cali Out of Cell process is initiated. If it is determined that the Cali Out of Cell process is initiated, the process returns to step 31 (FIGURE 2A) and continues the evaluation of the automatic transfers. If the Cali Out of Cell process does not start, the process moves to step 39 and starts the Cali Out of Cell process. The process then returns to step 31 and continues the evaluation of automatic transfers. FIGURES 3A and 3B are flowcharts illustrating the functions performed by the Cali Out of Cell process in parallel with the functions illustrated in FIGURES 2A and 2B. In the preferred embodiment of the present invention, a time delay is provided after the notification tone is sent to the subscriber before disconnecting the call. The notification tone may allow a fixed subscriber who inadvertently moves out of his subscription area to interrupt or reverse the course by remaining within his authorized area and completing his call. These fixed subscribers who choose to stay out of the area are given a notification and given a short time to end their conversation before disconnecting their call. After starting the Cali Out of Cell process in step 41, in step 42 a security timer is started if at least one candidate cell has been accepted as a target cell. The security timer runs for a predetermined period of time which may be, for example, in the range of 15-50 seconds. The period of security time is the period during which the subscriber's call is sure to be disconnected by the Cali Out of Cell process. An exemplary value of 20 seconds is described herein for illustrative purposes. In step 43, an inter-cell automatic transfer request counter is reset to zero (0) and the process thereafter registers the number of inter-cell automatic transfer requests received during the security time period. In step 44 the process determines whether or not the security time period has expired. If it has not expired, the process remains in step 44 and continues to record the number of inter-cell automatic transfer requests until the 20-second security timer expires. With the expiration of the security time period, the process moves to step 45 and determines whether or not the number of inter-cell automatic transfer requests received in the MSC during the 20 seconds is greater than or equal to a predetermined security threshold. which can be established, for example, in the range of 3-15 automatic transfer requests during the security time period. An exemplary value of three automatic transfer requests is described herein for illustrative purposes. If the number of automatic transfer requests received is less than three during the security time period of 20 seconds, the Cali Out of Cell process ends in step 46. However, if it is determined in step 45 that the number of The automatic transfer requests received in the MSC was equal to or greater than 3, then the process moves to step 47 where the inter-cell automatic transfer request counter is reset to zero (0). In step 48 a disconnection timer is started and the process is moved to step 49 in FIGURE 3B. The disconnect timer runs for a predetermined period of time after which the call can be disconnected by the Cali Out of Cell process. The period of the disconnection time can be, for example, in the range of 4-10 seconds. An exemplary value of 5 seconds is chosen for the description herein. Although the disconnect timer runs, the process registers the number of inter-cell automatic transfer requests received. In step 49 it is determined whether or not the inter-cell automatic transfer request counter is greater than or equal to a predetermined disconnection threshold which may be, for example, in the range of 1-3 automatic transfer requests during the period of disconnection time. An exemplary value of an automatic transfer request is described herein for illustrative purposes. If the number of automatic transfer requests received is less than 1 during the disconnection period of 5 seconds (for example, no request for automatic transfer was received), the process moves to step 51 where it is determined whether or not the disconnection time period has expired. If it has not expired, the process returns to step 49 and continues comparing the number of inter-cell automatic transfer requests with the disconnection threshold. If the disconnection timer has expired, the Cali Out of Cell process ends in step 52. However, it is determined in step 49 that the inter-cell automatic transfer request counter was greater than or equal to one, then the process moves to step 53 and optionally notifies the subscriber through a voice message stating that the subscriber's call is being disconnected because he has traveled outside his authorized cell. Then, in step 54, a release command is generated and the conversation ends at 55. In this way, it is considered that the operation and construction of the present invention will be evident from the aforementioned description. Although the method, apparatus and system shown and described have been characterized as being preferred, it will be readily apparent that various changes and modifications may be made herein without departing from the spirit and scope of the invention as defined in the following claims.

Claims (21)

1. a cellular telecommunications system having a plurality of cells and a plurality of subscribers using cellular telephones of approximately equal power of radio frequency transmitter to have access to a cellular system, the plurality of subscribers including at least one fixed subscriber assigned to a subscription area Fixed (FSA) connected in a call in process in a server cell, the system comprises: a mobile switching center (MSC) that includes a database defining which of the plurality of cells is included in the FSA; a residence location register (HLR) which stores a subscriber profile for each of the plurality of subscribers, each subscriber profile identifies whether an associated subscriber is a fixed subscriber; means for sending a query from the MSC to the HLR to determine whether a subscriber is a normal subscriber or a fixed subscriber; a plurality of base stations electronically connected to the MSC, each of the base stations transmitting radiofrequency signals over a coverage area defining one of the cells, and receiving radio frequency signals from cell phones of approximately equal radio frequency transmitter power; and a restricted mobility function to restrict the in-process call of the fixed subscriber to the FSA.

2. The cellular telecommunications system of claim 1, wherein the restricted mobility function includes the means for detecting when the fixed subscriber is crossing a cell boundary between the serving cell and a neighboring cell. The cellular telecommunications system of Claim 2, wherein the restricted mobility function includes the means for dropping the call in the process of the fixed subscriber when the fixed subscriber is detected by crossing a cell boundary between the serving cell and a cell neighbor which is located outside the FSA. 4. The cellular telecommunications system of claim 3, further comprising means for determining whether automatic transfers are allowed from the serving cell to the neighboring cell when the neighboring cell is located in the FSA. 5. The cellular telecommunications system of claim 4, further comprising means for allowing automatic transfer of the fixed subscriber from the serving cell to the neighboring cell when the neighboring cell is located in the FSA, and with the determination that the automatic transfers are allowed from the server cell to the neighboring cell when the neighboring cell is located in the FSA. The cellular telecommunications system of claim 5, wherein the means for dropping the call in the fixed subscriber's process includes: means for determining whether a threshold has been exceeded; and the means to generate a release order with the determination that the threshold has been exceeded. The cellular telecommunications system of claim 6, wherein the means for determining whether a threshold has been exceeded includes: a security timer to define a security time period during which the means for dropping the call in process It is forbidden to drop the call; means for recording the number of inter-cell automatic transfer requests received during the security time period; and the means for determining the number of inter-cell automatic transfer request requests received during the security time period is greater than or equal to a predetermined security threshold. The cellular telecommunications system of claim 7, wherein the means for determining whether a threshold has been exceeded further comprises: a disconnect timer to define a disconnection time period; means for initiating the disconnection timer with the determination that the number of inter-cell automatic transfer requests received during the security time period is greater than or equal to the predetermined security threshold; means for recording the number of inter-cell automatic transfer requests received during the disconnection time period; and means for determining whether the number of inter-cell automatic transfer requests received during the disconnection time period is greater than or equal to a predetermined disconnection threshold. 9. The cellular telecommunication system of claim 1 further comprises means for allowing automatic transfers of each of the plurality of subscribers that are not assigned to an FSA to any neighboring cell. 10. In a cellular telecommunications system having a mobile switching center server (MSC), a residence location register (HLR), a plurality of cells and a fixed subscription area (FSA), a method for restricting a call in process of a subscriber fixed to the FSA, the method comprises the steps of: receiving radiofrequency transmissions from a plurality of subscribers using cell phones of radio frequency transmitter power approximately equal to have access to the cellular system, the plurality of subscribers including fixed subscribers assigned to the FSA; defining, in a subscriber profile stored in the HLR, whether each of the plurality of subscribers is a fixed subscriber assigned to the FSA; detect when one of the plurality of subscribers is crossing a cell boundary between a serving cell and a neighboring cell; send a query from the server MSC to the HLR to determine if the subscriber crossing the limit of this cell is a fixed subscriber assigned to the FSA; determine, from a database in the MSC if the neighboring cell is located in the FSA; and dropping the call in the process of the fixed subscriber with the determination that the subscriber crossing the cell boundary is a fixed subscriber assigned to the FSA and the neighboring cell is located outside the FSA. 11. The method of restricting the in-process call of the fixed subscriber to the FSA of claim 10, further comprising the step of determining whether automatic transfers are allowed from the serving cell to the neighboring cell when the neighboring cell is located in the FSA . 12. The method of restricting the in-process call of the fixed subscriber to the FSA of claim 11, further comprises the step of allowing automatic transfer of the fixed subscriber from the serving cell to the neighboring cell with the determination that the neighboring cell is located in to the FSA, and with the determination that automatic transfers are allowed from the server cell to the neighboring cell when the neighboring cell is located in the FSA. 1

3. The method of restricting the in-process call of the subscriber to the FSA of claim 12, wherein the step of dropping the call in process of the fixed subscriber includes the steps of: determining whether a threshold has been exceeded; and generate a release order with the determination that the threshold has been exceeded. 1

4. The method of restricting the in-process call of the fixed subscriber to the FSA of claim 13, wherein the step of determining if it has exceeded a threshold includes the steps of: defining a security time period during which the means for dropping the call in process is forbidden to drop the call; record the number of inter-cell automatic transfer requests received during the security time period; and determining the number of inter-cell automatic transfer requests received during the security time period is greater than or equal to a predetermined security threshold. 1

5. The method of restricting the in-process call of the fixed subscriber to the FSA of claim 14, wherein the step of determining whether a threshold has been exceeded further comprises: defining a disconnection time period; initiating the disconnection time period with the determination that the number of inter-cell automatic transfer requests received during the security time period is greater than or equal to the predetermined security threshold; record the number of inter-cell automatic transfer requests received during the disconnection time period; and determining whether the number of inter-cell automatic transfer requests received during the disconnection time period is greater than or equal to a predetermined disconnection threshold. 1

6. The method of restricting the in-process call of the fixed subscriber to the FSA of claim 10 further comprises the means for allowing automatic transfers of each of the plurality of subscribers to any neighboring cell with the determination that each of the plurality of subscribers. subscribers is not assigned to an FSA. 1

7. In a cellular telecommunications system having a plurality of acro cells and a plurality of subscribers, the plurality of subscribers including at least one fixed subscriber assigned to a fixed subscription area (FSA) connected in a call in process in a serving macrocell, The system comprises: a mobile switching center (MSC) that includes a database defining which of the plurality of macrocells are included in the FSA a plurality of macrocells within the boundaries of the FSA; a residence location register (HLR) that stores a subscriber profile for each of the plurality of subscribers, each subscriber profile identifying whether an associated subscriber is a fixed subscriber; means for sending a query from the MSC to the HLR to determine whether a subscriber is a normal subscriber or a fixed subscriber; a plurality of base stations electronically connected to the MSC, each of the base stations transmitting radiofrequency signals over a coverage area defining one of the macro cells; and a restricted mobility function to restrict the in-process call of the fixed subscriber to the FSA. 1

8. The cellular telecommunications system of claim 17 further comprises means for detecting when the plurality of subscribers is crossing a cell boundary between the serving cell and a neighboring cell. 1

9. In a cellular telecommunications system having a mobile switching center server (MSC), a residence location register (HLR), a plurality of cells and a fixed subscription area (FSA), a method for restricting a call in process of a subscriber fixed to the FSA, the method comprises the steps of: receiving the radiofrequency transmissions from a plurality of subscribers using mobile stations to access the cellular system, the plurality of subscribers including the fixed subscribers assigned to the FSA; defining, in a subscriber profile stored in the HLR, whether each of the plurality of subscribers is a fixed subscriber assigned to the FSA; detecting when one of the plurality of subscribers is crossing a cell boundary between a serving macrocell and a neighboring cell; send a query from the server MSC to the HLR to determine if the subscriber that crosses the cell boundary is a fixed subscriber assigned to the FSA; determine, from a database in the MSC if the neighboring cell is located in the FSA; and dropping the call in the process of the fixed subscriber with the determination that the subscriber crossing the cell boundary is a fixed subscriber assigned to the FSA and the neighboring cell is located outside the FSA. 20. The method of restricting a call in the process of a fixed subscriber to an FSA of claim 19, wherein the step of detecting when one of the plurality of subscribers is crossing a cell boundary between a serving cell and a neighboring cell of approximately equal size includes detecting when one of the plurality of subscribers is crossing the cell boundary when the serving cell and the neighboring cell are both macrocells. 21. The method of restricting a call in the process of a fixed subscriber to an FSA of claim 19, wherein the step of detecting when one of the plurality of subscribers is crossing a cell boundary between a serving cell and a neighboring cell includes detect when one of the plurality of subscribers is crossing the cell boundary when the serving cell and a macrocell and the neighboring cell is a microcell.