MXPA98008459A - Cellular networks with base reserve stations ysatel - Google Patents

Abstract

A cellular network is described that includes a control station and a network of base stations installed one per cell, with which one or more mobile stations can communicate as they transit through a cell. The redundantly deployed reserve base stations are introduced together with the primary base station into a central area of each cell. Redundantly deployed standby base stations handle new calls when the associated primary base station is overloaded, participate in the retransmission of lost data due to degraded channel conditions and network congestion, and help loose commands. The primary and reserve satellite stations are deployed in regions marked by hills or valleys, to increase the communication capabilities of the primary and reserve base stations.

Description

CELLULAR NETWORKS WITH BASE RESERVE AND SATELLITE STATIONS FIELD OF THE INVENTION This invention relates to the improvement of the operation and reliability of a cellular network by the selective introduction of spatial redundancy in it.

BACKGROUND OF THE INVENTION Each cell or cell of a cellular telephone system includes a base station to service all mobile stations within the cell surrounding the base station, with desirable radio frequency (RF) signal strength. The base station in each cell has a certain fixed number of radio communication channels which it can assign to calls in progress within that cell. A mobile station ordinarily communicates with the base station in the cell in which it is located, on one of these radio communication channels. The individual cells cover the area of REF: 28649 complete geographical service, but the coverage is not exact and the neighboring cells overlap to form regions of loose controls. According to conventional practice, when a mobile station crosses the limit of the current cell and moves to another cell while transmitting the information, a communication path with a new base station located in the new cell must be established. If the radio communication channels are not available in the new cell and the mobile station is not able to acquire a new channel in the new cell and renounce its channel in its old cell before it has crossed over the limit and has moved completely to the new cell, a loose command failure has occurred and the call in progress is aborted. The probability of the loose command failure, that is, the probability that a mobile call in progress is forcibly aborted during a loose command because it could not be assigned to a radio communication channel in the new cell, is a major criterion to evaluate the quality of a cellular network system. Consequently, it is desirable to minimize the probability of failure by loose controls in any cellular network system.

In order to minimize the probability of failures by loose commands, an effective mobile cellular network must continually decide how best to allocate the limited group of available radio communication channels in a cell, for new calls that originate within the cell and the calls that migrate to the new cell from neighboring cells. This task is impeded by the inability of the base station located in a cell to handle all new calls that originate within the cell, as well as the loose commands that migrate to the cell from neighboring cells. The state of the mobile cellular network could be advanced, and the probability of failures by loose commands and transmission errors could be minimized, substantially if there were a better way to handle the overload of a base station with excessive communication with mobile stations, and were sent to the base station better warnings that a mobile station will soon enter a new cell, the base station being located in and associated with the new cell.

BRIEF DESCRIPTION OF THE INVENTION By employing spatial redundancy in a mobile cellular network in accordance with the principles of the invention, transmission errors as well as failure by loose commands are substantially minimized. The redundantly deployed reserve base stations are introduced together with the primary base station into a central area of each cell in the cellular network. The redundantly deployed reserve base stations handle new calls when the associated primary base station is overloaded, participate in the retransmission of lost data due to degraded channel conditions and congestion in the network, and assist the loose commands. Satellite stations are deployed in certain regions that are abundant in valleys or mountains to compensate for signal strength lost due to weakening and increased communication capabilities of the primary and reserve base stations. Such regions can span several cells of the network. Satellite stations prevent cuts in the "line of sight" between a base station and a mobile station when the mobile station moves around hills or mountains or through a valley, which reduces the likelihood of communication "interruptions". In an illustrative embodiment of the invention, a cellular network includes a control station and a network of cells through which one or more mobile stations can be moved. The control station controls the operation of the cellular network and provides a communication path between the network of the cells and the public switched telephone network. A primary base station located and associated with each of the cell networks communicates with the control station and with the mobile stations within the associated cell over a number of radio communication channels. A reserve base station deployed together with the primary base station in each cell, verifies its own cell and the adjacent cells, and is able to communicate with one or more mobile stations that move in the cell network. A primary satellite station and a reserve satellite station, in reserve for the failure or overload of the primary satellite station, are deployed in a region characterized by uneven terrain resulting from hills, tall buildings, etc., covering a number of cells with the In order to increase the communication capabilities of the cellular network, and to make the cellular network more robust. Each of the primary and reserve satellite stations is dedicated to supervising the cells within its coverage region. As one or more mobile stations move through the cell network, • deployed base and satellite stations generate reports. The control station determines the position and speed of the mobile stations that move in the cell network, based on the reports. The control station is able to determine that a particular mobile station, which is making a call associated with that particular mobile station, is close to crossing a boundary between a first cell and a second cell, and if it is determined that the primary base station located in the second cell has failed, is overloaded, or is likely to overload, the call allocation can be changed to a reserve base station deployed in the second cell, instead of the primary base station. The call allocation may be subsequently changed from the reserve base station to another station at a later time. Base stations and satellite stations continue to periodically verify the activity of the cell, report their results to the control station, and issue warnings of loose impediment commands. When another mobile station enters the region characterized by uneven terrain, the occurrence of which may be indicated by the strength of the signal or other data, the control station handles a call associated with the other mobile station from a primary base station towards the primary satelit.al station deployed in the region. The cellular network is made even more robust with the reserve satellite station deployed in the region, as a backup for the primary satellite station.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 illustrates a cellular network including a control station and a network of cells, each cell having a primary base station and a reserve base station deployed in the central area thereof; Figure 2 illustrates a cellular network that includes a control station and a network of cells with base and satellite stations, which periodically verify the capacity of the cell and report their results to the control station; Figure 3 illustrates the memory at the control station described in Figure 2, after a first stage of cell activity; Figure 4 is a flow chart of a control program that runs at the control station described in Figure 2; Figure 5 illustrates the memory described in Figure 2, after a second stage of cell activity; Figure 6 illustrates the memory described in Figure 2, after a third stage of cell activity; Y Figure 7 illustrates the memory described in Figure 2, after a fourth stage of cell activity.

DETAILED DESCRIPTION For a better understanding of the invention, together with other and additional objectives, advantages and capabilities thereof, reference is made to the following description and to the figures of the drawings. For clarity of explanation, the illustrative embodiments of the present invention are presented as having individual functional blocks. The functions that these blocks represent can be provided through the use of either shared or dedicated hardware, including, but not limited to, physical equipment capable of running a computer software. Illustrative embodiments may comprise the physical digital signal processor (DSP) equipment, the read-only memory (ROM) for storing the computer hardware (software) performing the operations discussed below, and the random access memory (RAM) to store the DSP results. The very large scale physical equipment (VLSI) modalities, as well as the customary VLSI circuitry, in combination with a general purpose DSP circuit, can also be provided.

Transmission errors and single-knock failures are substantially minimized by the redundantly paired reserve base stations, together with the primary base stations in a central area, of each cell in a cellular network, and by deploying a station primary satellite station with a satellite reservation station in strategic locations throughout the cellular network. In the exemplary network of cells described in Figure 1, each cell 10 includes a primary base station 12 and a reserve base station 14, positioned in a central area of the cell. Each primary and reserve base station is equipped with an omnidirectional antenna to provide coverage for cell activity in that cell and in adjacent cells. The placement of the reserve base station with the primary base station in the center of the cell reduces the need for wiring over additional ground for the control station. Reserve base stations handle new calls when a primary base station is, or will probably become, overloaded, participate in the retransmission of lost data due to degraded channel conditions and network congestion, and help to manage freely in any passive or active mode. Each reserve base station can "listen" and discretely verify activities in adjacent cells. When an error occurs by single commands as a mobile station moves to a new cell, instead of the current primary base station transferring the signaling to a new primary base station, the reserve base station provides uninterrupted services for the transfer of information, and then, subsequently, when the mobile station is perfectly within the new cell, the reserve base station can pass the control to the primary base station associated with the new cell. When a reserve base station operates in a passive mode it "listens" using its omnidirectional antenna, discretely verifies the activities of all the cells in its coverage area and informs the control station about the current load of the adjacent cells . The reserve station jumps or jumps whenever there is a need for help, thereby providing fault tolerance and improved operation. With reference to Figure 1, the control station 16 periodically verifies the calls in the network, determines and predicts the traffic patterns and the probability of the crossings of boundaries between cells, and issues warnings regarding the anticipated resource demand. If a failure occurs in a primary base station, or if the loose command separator for a primary base station is above a predefined threshold, the standby base station will serve as an additional base station to support the new calls. Any void or hole in the cell coverage due to blocking of the transmission caused by hills 18 or large buildings, is filled by satellite stations selectively introduced throughout the topology of the cellular network. With reference to Figure 1, the satellite stations are deployed in pairs of primary 20 satellite and reserve 22 stations in the problem regions. The principles of the invention are applicable to analog, digital and PCS cellular networks for voice and data. With reference to Figure 2, an exemplary mobile cellular network according to the specific embodiment of the invention comprises a network of cells 26 and a control station 28. Cell network 26 in this exemplary embodiment includes a first cell Cl, a second cell C2, a third cell C3, a fourth cell C4, a fifth cell C5, a sixth cell C6, and a seventh cell C7. The first cell Cl includes a first primary base station BSl and a first backup base station SS1. The second cell C2 includes a second primary base station BS2 and a second backup base station SS2. The third cell C3 includes a third primary base station BS3 and a third backup base station SS3. The fourth cell C4 includes a fourth primary base station BS4 and a fourth reserve base station SS4. The fifth cell C5 includes a fifth station b is primary BS5 and a fifth base station reserve SS5. The sixth cell C6 includes a sixth primary base station BS6 and a sixth backup base station SS6. The seventh cell C7 includes a seventh primary base station BS7 and a seventh backup base station SS7. While a standby base station is deployed per cell in the preferred embodiment of the invention, the degree of spatial redundancy employed in the cellular network can be adjusted according to the invention. It can be deployed less than one reserve base station per cell; that is, a reserve base station can be deployed in a region encompassing a plurality of cell networks. For example, the cellular network may include a single standby base station, deployed in the middle part of a hexagonal configuration of the seven cells, such as in the fifth cell C5 shown in Figure 2. This lower degree of redundancy offers savings in the cost, but it provides less reliability. If a reserve base station is deployed for the various cells (for example, so that the reserve base station is deployed in the middle part of the hexagonal configuration), each reserve base station must have greater transmission power and a Most sensitive receiver in order to "dominate" the larger coverage area In a particularly rugged terrain that has many hills and valleys, communications between mobile stations and base stations are often prevented and degraded, resulting in interruptions and outages. Another aspect of the invention, which deploys redundantly paired satellite stations, helps to prevent such communication interruptions Satellite stations are selectively introduced throughout the topology of the cellular network to fill any empty space in the coverage of a network. cell, due to the blocking of the transmission caused by hills 30 or buildings The satellite stations are deployed in pairs of primary satellite and reserve stations on the same site to avoid excessive cabling requirements. In such a pair, the P-SAT primary satellite station increases the communication capacity of the primary and reserve base stations, and is usually deployed to cover several cells. The S-SAT satellite reservation station is deployed in the region as a backup for the P-SAT primary satellite station. The control station 28 includes an input / output adapter 32 (1/0), a processor 34, a memory 36, and a collective bar or bus 38. The input / output adapter 32 (1/0) is in communication with the public switched telephone network (PSTN) 40, and with the primary base station and the reserve base station of each of the cell networks 26, and the pair of satellite stations, through a line on the ground in the shape of a spine. The processor 34 is coupled to the I / O adapter 32 and the memory 36 through the collective bus 38. The memory 36 is in communication with the adapter 1/0 32 through the collective bus 38. The memory 36 stores a program control 42, which runs in the control station 28. The memory 36 includes an allocation separator 44, and for each of the cells in the network of cells that are being verified by the control station, and for each pair of satellite stations, a separator 46 of loose controls. By way of example, and not limitation, Figure 3 schematically depicts within the memory 36 a loose handle separating section BS1, a loose handle separating section SS1, a loose handle separating station BS2, a loose handle separating station SS2, a separator section of single P-SAT knobs, and a separate S-SAT knob separator section for purposes of describing this illustrative embodiment of the invention. The assignment separator 44 indicates the current assignment of particular mobile stations to particular primary or reserve base stations, or to any of the satellite stations described according to this specific embodiment of the invention. Each separate knob separator section (for BS1, SS1, BS2, SS2, P-SAT, and S-SAT) shown in Figure 3 indicates a current record of how many mobile stations are assigned to the particular base station or satellite. Each of the single-handle separator sections described in Figure 3 stores and updates the data according to the control program 42. Each of the separators in the memory 36 is used to periodically check and store the data with respect to a or more mobile stations. Each of the separators stores a label (for example, Ml, M2, ..., etc.) for one or more of the mobile stations with which it communicates, -and stores a signal level and a bit error rate, for each or more of the stations mobiles, as shown in Figure 3. With reference to Figure 2, the cellular network is controlled by the control station 28 as the base and satellite stations periodically verify the activity of the cell and report their results to the control station 28. According to the example described by Figure 2, three mobile stations are moving through the seven-cell network 26. The three mobile stations include a first mobile station Ml, a second mobile station M2, and a third mobile station M3. The mobile station Ml and the mobile station M2 are shown in the first cell Cl. The third mobile station M3 is shown in the second cell C2. As illustrated in Figure 3, the mobile station M1 is in communication with the first primary base station BS1, the first backup base station SS1, the second primary base station BS2, and the second backup base station SS2. The mobile station M2 is in communication with the first primary base station BS1, the first backup base station SS1, and the second backup base station SS2. The mobile station M3 is in communication with the second primary base station BS2 and the second backup base station SS2. The assignment separator 44 described in Figure 3 shows that the mobile station M1 is assigned to the primary base station BS1. The mobile station M2 is assigned to the primary base station BS1 as shown by the assignment separator 44. The mobile station M3 is assigned to the primary base station BS2. In Figure 3, the separator section BSl shows that the primary base station BS1 is "correct" ("OK") (for example, that it has not failed or has not been overloaded). The spacing section BSl also shows that two mobile stations are currently assigned to the primary base station BSl. The separating section SS1 shows in Figure 3 that the reserve base station SS1 is OK (it has not failed or has already become overloaded) and that zero mobile stations are currently assigned to the reserve base station SS1. The separating section BS2 shows in Figure 3 that the primary base station BS2 is OK and that a mobile station is currently assigned to the primary base station BS2. The separator section SS2 shows that the backup base station SS2 is currently OK and that zero mobile stations are currently assigned to the reserve base station SS2. % The P-SAT splitter section shows that the P-SAT primary satellite station is OK and that zero mobile stations are currently assigned to the P-SAT primary satellite station. The S-SAT separating section shows that the S-SAT satellite reservation station is OK and that zero mobile stations are currently assigned to the S-SAT satellite reservation station. With reference to Figure 2, the processor 34 within the control station 28 runs the control program 42 stored in the memory 36. The processor 34 controls the data going in and out of the control station 28 through of the I / O adapter 32 on the communication line 48 and the communication line 50. Figure 4 is a flow chart of the control program 42 running at the control station 28. With reference to Figure 4, the program control 42 includes a group of instructions which, when executed by the processor 34, cause the control station 28 to continuously perform the following sequence of steps and repeat those steps during the operation according to the control program 42. that the base and satellite stations periodically verify the activity of the cell in the network of cells 26 and send reports to the control station 28 through the communication line 48 coupled to the adapter Tador de 1/0 32, the control station 28 periodically verifies the calls in the cellular network in step 54. The control station 28 receives the reports regarding the traffic loads in the step 56. The control station 28 receives the reports of the loose controls normal mobiles in step 58. The position and speed of the mobile stations are computed based on the signal levels and the bit error rain step 60. The probabilities of the cell boundary crossings are computed in step 62. The future call traffic patterns are projected in step 64. If a primary base station is failing, the calls are assigned to a standby base station in step 66. If a separate remote control knob The primary base station is or is likely to become overloaded, calls are assigned to a standby base station in step 68. If a mobile station enters a land region of Likewise equipped with service by a primary satellite station, the mobile station is assigned to the primary satellite station in step 70. If the primary satellite station fails, or becomes overloaded, the mobile station is assigned to the satellite reservation station in step 72. The base and satellite stations continue to report to the control station 28, which continues to periodically verify calls from the cellular network in step 74, after which the sequence of steps is repeated according to the control program 42. With reference to Figure 3, the separating section for the primary base station BSl shows that the primary base station BSl is in communication with the mobile station Ml and with the mobile station M2. The separator section for the reserve base station SSl shows that the reserve base station SSl is in communication with the mobile station Ml and the mobile station M2. The spacing section for the primary base station BS2 shows that the primary base station BS2 is in communication with the mobile station MI and with the mobile station M3. The separator section for the reserve base station SS2 shows that the reserve base station SS2 is in communication with the mobile station Ml, with the mobile station M2, and with the mobile station M3. The separating section for the P-SAT primary satellite station. shows that the P-SAT primary satellite station is not in communication with any of the mobile stations. The separating section for the S-SAT satellite reservation station shows that the S-SAT satellite reservation station is not in communication with any of the mobile stations. The assignment separator 44 shows that the mobile station M1 is assigned to the primary base station BS1, the mobile station M2 is assigned to the primary base station BS1, and the mobile station M3 is assigned to the primary base station BS2. One of the benefits of the spatial redundancy provided by the invention is that the standby base stations can handle a free command as a mobile station traverses a boundary between the cells. Also, standby base stations can undertake primary communication with a mobile station when a primary base station fails. For example, if the primary base station BSl becomes overloaded while the mobile station M2 is operated, the control station 28 is able to assign the mobile station M2 to the reserve base station SS1. If the primary base station BS2 fails as the first mobile station Ml traverses the boundary between the first cell Cl and the second cell C2, the control station 28, for example, may assign the first mobile station Ml to the reserve base station SS2 , instead of the primary base station BS2. With reference to Figure 5, the mobile station M2 is in communication with the primary base station BS1, the reserve base station SS1, and the reserve base station SS2. The separator section for the reserve base station SSl shows that the backup base station SSl is in communication with the mobile station M2. The separator section for the backup base station SS2 indicates that the backup base station SS2 is in communication with the mobile station M2. The spacing section for the primary base station BSl indicates that the primary base station BSl becomes overloaded. Based on the relative signal strengths and the bit error rates for the communication of the backup base station SSl and the backup base station SS2 with the mobile station M2, the control station 28 assigns the mobile station M2 to the reserve base station SS1. With reference to Figure 5, the assignment separator 44 shows that the control station 28, because the primary base station BSl becomes overloaded, has assigned the mobile station M2 to the reserve base station SS1. The spacer section for the reserve base station SSl shows an increase (as compared to Figure 3) from zero to one in the number of current assignments in response to the mobile station M2 now being assigned to the reserve base station SS1. While the separating section for the primary base station BSl shows a decrease (as compared to Figure 3) in the number of current assignments for the primary base station BS1 by a mobile station from two to one.

With reference to Figure 6, the separating section for the primary base station BS2 indicates that the primary base station BS2 fails. Because the primary base station BS2 has failed, when the mobile station Ml traverses the boundary between the first cell Cl and the second cell C2 as described in Figure 2 and enters the second cell C2, the control station 28 assigns the first mobile station Ml to the reserve base station SS2 instead of the primary base station BS2. Also when the primary base station BS2 fails, the control station 28 allocates the mobile station M3 from the primary base station BS2 to the reserve base station SS2. With reference to Figure 6, the assignment separator 44 shows that the control station 28 has assigned the mobile station Ml to the reserve base station SS2 and the assigned mobile station M3 to the reserve base station SS2, due to the failure of the BS2 primary base station. The separator section for the backup base station SS2 shows an increase of one to three (compared to Figure 5) in the number of current assignments in response to the mobile station Ml and the mobile station M3 that is now assigned to the station reserve base SS2. The spacing section for the primary base station BS2 shows a decrease in the number of current assignments for the primary base station BS2, from one to zero (as compared to Figure 5). Deploying the reserve base stations throughout the cell network 26 helps to ensure constant communication with the mobile stations. After the failure of a primary base station, the reserve base stations can pick up the rebound so that the mobile stations can still communicate with the PSTN 40. When a primary base station becomes overloaded, or it is likely that it will reach overloading, by excessive communication with mobile stations, a redundantly deployed standby base station can take over communication with one or more mobile stations to prevent overloading the primary base station. The control station 28 performs a continuous periodic verification process to detect the loose impediment commands, the faults of the primary base stations, and the overload of the primary base stations in order to operate the cellular network in accordance with the principles of the intion. When the mobile station M3 moves behind the hills 30 as described in cell C2 in Figure 2, communication between the mobile station M3 and the reserve base station SS2 is blocked and prevented by the hills 30. The station control 28 detects this condition by means of a comparison of signal levels and / or bit error rates, and based on the position and speed of the mobile station M3. With reference to Figure 7, in response to this condition 'the assignment of the mobile station M3 is changed from the reserve base station SS2 to the primary satellite station P-SAT which is dedicated to cover a region at least partially defined by cell C2, cell C4, and cell C5. With reference to Figure 7, the mobile station M3 is in communication with the primary satellite station P-SAT and the satellite reserve station S-SAT, which are deployed together as a pair to cover the region marked by uneven terrain. The separating section for the P-SAT primary satellite station shows that the P-SAT primary satellite station is in communication with the M3 mobile station. The separating section for the S-SAT satellite reservation station shows that the S-SAT satellite reservation station is in communication with the M3 mobile station. The assignment separator 44 shows that the mobile station M3 has been assigned to the P-SAT primary satellite station, because it has moved behind the hills and out of the "line of sight" of the reserve base station SS2 . One of the advantages provided by the invention is that if the P-SAT primary satellite station fails, the control station 28 is capable of changing the assignment of the mobile station M3 to the redundantly deployed S-SAT satellite reservation station, so that communication with PSTN 40 is maintained. From the above it will be appreciated that the base stations of reservations strategically introduced throughout the cellular network, are able to retransmit lost data packets due to network congestion or high error rates, handle new calls when a primary base station is overloaded, and help control loose; and also that the principles of the invention are applicable to analog, digital, and PCS cellular networks. While various particular forms of the invention have been illustrated and described, it will also be apparent that modifications can be made without departing from the spirit and scope of the invention.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention is that which is clear from the present description of the invention.

Having described the invention as above, property is claimed as contained in the following:

Claims (13)

RE IVINDICATIONS

1. A cellular network, characterized in that it comprises: a network of cells through which one or more mobile stations can move; a control station coupled in communication to the cell network; a primary base station, which can communicate with one or more of the mobile stations, deployed in each of the cell networks; a reserve base station, which can communicate with one or more of the mobile stations, deployed in each of the cell networks; a primary satellite station, which can communicate with one or more of the primary and reserve base stations, deployed to cover a region within the cell network; and a satellite reservation station, which increases the primary satellite station, deployed in said region.

2. A cellular network according to claim 1, further characterized in that it comprises: a programmable processor within the control station, wherein the processor is programmed to execute the step of: assigning a call associated with a mobile station from one of the primary base stations to one of the reserve base stations.

3. A cellular network according to claim 1, further characterized in that it comprises: a memory within the control station, and a control program stored in the memory.

4. A cellular network according to claim 3, characterized in that it comprises: a memory comprising an assignment separator, a loose command separator of the primary base station for each deployed primary base station, and a loose command separator of the base station reserve for each reserve base station deployed.

A cellular network according to claim 3, characterized in that the control program comprises a group of instructions, which when performed by a processor, cause the processor to execute a series of steps comprising: the assignment of a call associated with a mobile station from one of the primary base stations to one of the reserve base stations.

6. A cellular network according to claim 1, characterized in that: the primary and reserve base stations are deployed in a central area of each of the cell network.

7. A method of routing a call, for use in a cellular network comprising a network of cells having a station, primary base deployed in each of the cell networks, the method is characterized in that it comprises the steps of: unfolding of a reserve base station together with each primary base station, in a central area of each of the cell networks; the periodic verification of a call assigned to a particular of the primary base stations and associated with a mobile station; the issuance of a warning that the mobile station will cross a boundary between the cells of the network; and changing the assignment of the call from a particular of the primary base stations to a particular reserve base station, based on the warning.

8. A method according to claim 7, further characterized in that it comprises the step of: determining the position and speed of the mobile station.

9. A method according to claim 7, further characterized in that it comprises the step of: determining the assignment of the call based on a signal level and a bit error ratio.

A method according to claim 1, further characterized in that it comprises the step of: receiving a report from a reserve base station deployed in one of the cell networks.

11. A method according to claim 7, further characterized in that it comprises the step of: changing the assignment of the call from the particular standby base station to a second primary base station.

12. A method according to claim 7, further characterized in that it comprises the step of: deploying a primary satellite station to cover a region within the network of cells, the primary satellite station increases the primary and reserve base stations deployed in the network of cells

13. A method according to claim 12, further characterized in that it comprises the step of: deploying a satellite reservation station in said region, the satellite reservation station increases the primary satellite station.