Management device, management method, and management program

Abstract

To provide a technique for determining a transferring mobile station for maintaining communication quality when at least one of the transferring mobile station and a transferred mobile station moves.SOLUTION: A management device manages a communication system including a base station that forms a communication service area in which communication is possible, a transferred mobile station located outside the communication service area, and a mobile station located within the communication service area. The management device includes a role determination unit that determines whether or not a role of the mobile station is a transferring mobile station based on a transmission output and a moving speed of the mobile station located within the communication service area.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to management technology, and particularly to a management apparatus, a management method, and a management program for managing mobile stations. It relates to a gram.

Background Art

[0002] A mobile station existing outside the communicable area of a base station cannot communicate with the base station. In order to enable communication between such a mobile station and the base station, another mobile station existing within the communicable area relays the communication between the mobile station and the base station (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a mobile station moves, depending on the arrangement of each mobile station, the combination of the mobile station that should perform relaying within the communicable area (hereinafter referred to as the "transfer mobile station") and the mobile station that receives relaying from the transfer mobile station outside the communicable area (hereinafter referred to as the "transferred mobile station") may need to be changed in order to maintain communication quality (signal quality). Also, in order to maintain communication quality, it is important which mobile station is used as the transfer mobile station.

[0005] The present invention has been made in view of such a situation, and an object thereof is to provide a technique for determining a transfer mobile station for maintaining communication quality when at least one of the transfer mobile station and the transferred mobile station moves.

Means for Solving the Problem

[0006] To solve the above problems, a management device according to an aspect of the present invention is a management device for managing a communication system including a base station forming a communicable communication service area, a mobile station to be transferred located outside the communication service area, and a mobile station located within the communication service area, and includes a role determination unit that determines whether the role of the mobile station is a transfer mobile station based on the transmission output and the moving speed of the mobile station located within the communication service area.

[0007] A management method according to an aspect of the present invention is a management method for managing a communication system including a base station forming a communicable communication service area, a mobile station to be transferred located outside the communication service area, and a mobile station located within the communication service area, and includes a role determination step of determining whether the role of the mobile station is a transfer mobile station based on the transmission output and the moving speed of the mobile station located within the communication service area.

[0008] A management program according to an aspect of the present invention is a management program executed by a computer operating as a management device for managing a communication system including a base station forming a communicable communication service area, a mobile station to be transferred located outside the communication service area, and a mobile station located within the communication service area, and includes a role determination step of determining whether the role of the mobile station is a transfer mobile station based on the transmission output and the moving speed of the mobile station located within the communication service area.

[0009] Note that any combination of the above components, and the expressions of the present invention in terms of method, apparatus, system, recording medium ​​​​Those converted between a body, a computer program, etc. are also effective as aspects of the present invention. Yes.

Advantages of the Invention

[0010] According to the present invention, when at least one of the transfer mobile station and the transfer destination mobile station moves, a transfer mobile station for maintaining communication quality can be determined. Yes.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Modes for Carrying Out the Invention

[0012] Before specifically describing this embodiment, first, an overview will be given. This embodiment relates to a communication system including a base station and a mobile station. The base station forms a communication service area of a certain range and can communicate with mobile stations within the communication service area, but cannot communicate with mobile stations outside the communication service area. In order for a mobile station existing outside the communication service area to also communicate with the base station, in the communication system according to this embodiment, the communication between the mobile station outside the service area (hereinafter referred to as the "transferred mobile station") and the base station is relayed by a mobile station within the service area (hereinafter referred to as the "relay mobile station"). When the relay mobile station is mounted on a vehicle and the transferred mobile station is carried by a user, the relay mobile station and the transferred mobile station are movable, and their positional relationships vary. Therefore, even if the relay mobile station exists at a position where it can relay the communication between the transferred mobile station and the base station, due to the movement of at least one of the relay mobile station and the transferred mobile station, the relay mobile station may no longer exist at a position where it can relay the communication between the transferred mobile station and the base station. When at least one of the relay mobile station and the transferred mobile station moves, it is required to appropriately change the combination of the relay mobile station and the transferred mobile station.

[0013] The communication system according to this embodiment changes the combination of the relay mobile station and the transferred mobile station based on the positions and relative velocity vectors (hereinafter referred to as "relative velocity vectors") of the relay mobile station and the transferred mobile station with respect to each other.

[0014]

[0015] Figure 1 shows the configuration of the communication system 1000. The communication system 1000 includes a base station 100, a first relay mobile station 200a and a second relay mobile station 200b collectively referred to as relay mobile stations 200, and a transferred mobile station. The first mobile station to be transferred 300a, the second mobile station to be transferred 300b, etc., collectively referred to as the transferred mobile station 300, includes the third mobile station to be transferred 300c and the management device 400. The number of base stations 100, the number of transfer mobile stations 200, and the number of mobile stations to be transferred 300 included in the communication system 1000 are not limited to "1", "2", "3", respectively.

[0016] The base station 100 is a wireless device capable of performing wireless communication. The base station 100 forms a communication service area 110 capable of wireless communication and communicates with mobile stations existing within the communication service area 110. The transfer mobile station 200 is a mobile station located within the communication service area 110 and capable of communicating with the base station 100. Also, the transfer mobile station 200 can be mounted on a vehicle, for example, and can move. The mobile station to be transferred 300 is a mobile station located outside the communication service area 110 and incapable of communicating with the base station 100. Also, the mobile station to be transferred 300 can be carried by a user, for example, and can move.

[0017] In order to enable communication between the base station 100 and the mobile station to be transferred 300 in such a situation, the transfer mobile station 200 relays between the base station 100 and the mobile station to be transferred 300. The range within which the first transfer mobile station 200a can communicate with the mobile station to be transferred 300 is shown as the first transferable range 210a, and the range within which the second transfer mobile station 200b can communicate with the mobile station to be transferred 300 is shown as the second transferable range 210b. Here, the first mobile station to be transferred 300a and the second mobile station to be transferred 300b existing within the first transferable range 210a can communicate with the first transfer mobile station 200a, and the third mobile station to be transferred 300c existing within the second transferable range 210b can communicate with the second transfer mobile station 200 b.

[0018] ​​​​​​​​​The first transfer mobile station 200a, the first transferred mobile station 300a, and the second transferred mobile station 300b form one group. The first transfer mobile station 200a relays between the base station 100 and the first transferred mobile station 3 00a, and also relays between the base station 100 and the second transferred mobile station 300b. Also, the second transfer mobile station 200b and the third transferred mobile station 300c form one group, and the second transfer mobile station 200b relays between the base station 100 and the third transferred mobile station 300c. Here, since the second transfer mobile station 200b and the first transferred mobile station 300a are not in the same group, the second transfer mobile station 200b does not relay between the base station 100 and the first transferred mobile station 300a.

[0019] Such groups of transfer mobile stations 200 and transferred mobile stations 300 are generated in the management device 400 connected to the base station 100. To generate groups in the management device 400 or to change groups in the management device 400, the following processing is executed in the communication system 1000.

[0020] Each transfer mobile station 200 and each transferred mobile station 300 are equipped with a positioning function using GNSS (Global Navig ation Satellite System), and periodically measure their own positions. The transfer mobile station 200 periodically transmits the measured position information to the base station 100. The transferred mobile station 300 periodically transmits the measured position information to the base station 100 via the transfer mobile station 200. A transferred mobile station 300 that is not included in any group broadcasts the position information, and the transfer mobile station 200 that receives the position information transmits the position information to the base station 100.

[0021] ​​​The management device 400 acquires the position information of each transfer mobile station 200 and the position information of each transfer destination mobile station 300 via the base station 100. As a result, the management device 400 or the base station 100 recognizes each transfer mobile station 200 and each transfer destination mobile station 300. The management device 400 classifies the mobile stations existing within the transferable range 210 as transfer mobile stations 200 based on the position information, and classifies the mobile stations that do not perform relaying (hereinafter referred to as "normal mobile stations"). A normal mobile station only communicates with the base station 100. The classification of the transfer mobile station 200 and the normal mobile station is made based on, for example, the transmission power (also referred to as the antenna power or the transmission output) and the moving speed.

[0022] The management device 400 calculates the speed vector of each transfer mobile station 200 based on the position information of each transfer mobile station 200, and calculates the speed vector of each transfer destination mobile station 300 based on the position information of each transfer destination mobile station 300. Also, the management device 400 calculates the distance between the transfer mobile station 200 and the transfer destination mobile station 300. The management device 400 generates a group including the transfer mobile station 200 and the transfer destination mobile station 300 based on the speed vector and the distance. By such processing, even if at least one of the transfer mobile station 200 and the transfer destination mobile station 300 moves, the group is changed. The management device 400 transmits the group information to each transfer mobile station 200.

[0023] Hereinafter, the identifier (UID) of the first transfer mobile station 200a is set to "001", the UID of the second transfer mobile station 200b is set to "002", the UID of the first transfer destination mobile station 300a is set to "101" ", the UID of the second transfer destination mobile station 300b is set to "102", and the UID of the third transfer destination mobile station 300 c is set to "103". Also, the position information of the first transfer mobile station 200a is (xm1, ​​​​​​​​​​The position information of the first transfer mobile station 200a is shown as (xm1, ym1), and the position information of the second transfer mobile station 200b is shown as (xm2, ym2). The position information of the first transferred mobile station 300a is shown as (xp1, yp1).

[0024] Figure 2 shows the configuration of the management device 400. The management device 400 includes an acquisition unit 410, a storage unit 41 2, a derivation unit 414, a determination unit 416, and an instruction unit 418. Hereinafter, the processing of the management device 400 will be described while also using Figures 3 to 11. Figure 3 is a flowchart showing the procedure for determining roles and groups by the management device 400.

[0025] The acquisition unit 410 of the management device 400 transmits a status confirmation request for each transfer mobile station 200 and each transferred mobile station 300 to the base station 100 (S10). The base station 100 transmits the status confirmation request to the transfer mobile station 200, and the transfer mobile station 200 transmits the status confirmation request to the transferred mobile station 300. The transfer mobile station 200 that has received the status confirmation request transmits a response including the status of the transfer mobile station 200, for example, the position information of the transfer mobile station 200 and the information of the transmission output, to the base station 100. Also, the transferred mobile station 300 that has received the status confirmation request transmits a response including the status information of the transferred mobile station 300, for example, the position information of the transferred mobile station 300 and the information of the transmission output, to the transfer mobile station 200. The transfer mobile station 200 transfers the response from the transferred mobile station 300 to the base station 100. The transfer mobile station 200 and the transferred mobile station 300 may transmit the position information periodically regardless of the status confirmation request. The acquisition unit 410 waits for a response from the transfer mobile station 200 or the transferred mobile station 300 (S1 If there is no response (N in S14) and it is not a timeout (N in S16), the acquisition unit 41 If there is no response (N in S14) and it is not a timeout (N in S16), the acquisition unit 41 0 waits for a response from the transfer mobile station 200 or the transferred mobile station 300 (S1 2). If there is no response (N in S14) and it is not a timeout (N in S16), the acquisition unit 41 waits for a response from the transfer mobile station 200 or the transferred mobile station 300 (S1

[0026] 2). If there is no response (N in S14) and it is not a timeout (N in S16), the acquisition unit 41 2). If there is no response (N in S14) and it is not a timeout (N in S16), the acquisition unit 41 0 continues to wait for a response (S18). If there is a response (Y in S14), steps 16 and step 18 are skipped. From this, the acquisition unit 410 acquires information on the state of the transfer mobile station 200 or the transferred mobile station 300. As a result, the acquisition unit 410 acquires the position information of the transfer mobile station 200 or the transferred mobile station 300. The acquisition unit 410 stores the acquired state information in the storage unit 412.

[0027] FIG. 4 shows the data structure of the state table stored in the storage unit 412. "Unit I D" indicates the UID for each transfer mobile station 200 or each transferred mobile station 300, and "Un it Position" indicates the position information of each transfer mobile station 200 or each transferred mobile station 300, and "Time" indicates the time when the position information was acquired at the transfer mobile station 200, the transferred mobile station 300, or the management device 400. Such a state table is generated for each of the times t, t -1, t-2, ···, t-n.

[0028] FIG. 5 shows another data structure of the state table stored in the storage unit 412. "RF R ange" indicates the transmission output. "Large" corresponds to a large transmission output, "Mid" corresponds to a medium transmission output, and "Small" corresponds to a small transmission output. "Unit rol e" indicates the role of the mobile station. "Forwarding" corresponds to the transfer mobile station 200, and " Forwarded" corresponds to the transferred mobile station 300. "Fowarding Gro up" indicates the aforementioned group, and "Neighbor group" indicates the surrounding group. Returning to FIG. 3, the determination unit 416 executes a role determination process (S20). FIGS. 6 and 7 are also used to explain the role determination process.

[0029] FIG. 6 is a flowchart showing a procedure for determining a role by the management device 400. 16 refers to the state table stored in the storage unit 412 and The location information and transmission output of the transferring mobile station 300 are confirmed (S50). Based on the location information of the state table stored in 412, each transferring mobile station 200 or each transferred The velocity vector of the mobile station 300 is calculated (S52). For example, the velocity vector of the first forwarding mobile station 200a is Divide the difference between the location information at time t and the location information at time t-1 by the time difference between time t and time t-1 The velocity vector of the first transfer mobile station 200a is calculated by The same applies to the mobile station 200 and the forwarded mobile station 300. The vector is stored in the storage unit 412. FIG. 7 shows a further example of the state table stored in the storage unit 412. Another data structure is shown below. Velocity Vector ) is stored in the state table. Return to Figure 6.

[0030] The determination unit 416 determines, among the mobile stations whose location information is included in the communication service area 110, The transmission output is large (Y in S54), and the absolute value of the velocity vector, i.e., the velocity, is greater than a constant value α. The mobile station having the smallest forwarding role (Y in S56) is determined to be the forwarding mobile station 200 (S58 On the other hand, the determination unit 416 determines whether the mobile station whose location information is included in the communication service area 110 is a Among them, the mobile station with the low transmission output (N in S54) or the mobile station with the speed lower than a certain value α If the mobile station is not a member of the group (N in S56), the mobile station is assigned the normal role (S60).

[0031] Return to FIG. 3. The derivation unit 414 and the determination unit 416 execute transfer allocation processing (S22). . To explain the transfer allocation processing, FIG. 8 is also used. FIG. 8 shows the transfer allocation procedure by the management device 400 . It is a flowchart showing the transfer allocation procedure by the acquisition unit 410. The acquisition unit 410 updates the information of the state table stored in the storage unit 412 (S100). The determination unit 416 executes reallocation of the transfer destination mobile station 300 to the transfer mobile station 200 (S102). The derivation unit 414 calculates the change amount (104). To explain the change amount calculation process, FIG. 9 is also used. . FIG. 9 is a flowchart showing the change amount calculation procedure by the management device 400. The derivation unit 414 calculates the inter-station distance Δd between the mobile stations based on the position information of the transfer destination mobile station 300 and the position information of the transfer mobile station 200 (S150). For example, the derivation unit 414 derives the first inter-station distance Δd(p1,m1) based on the position information (xp1,yp1) of the first transfer destination mobile station 300a and the position information (xm1,ym1 ) of the first transfer mobile station 200a.

[0032] . FIG. 9 is a flowchart showing the change amount calculation procedure by the management device 400. The derivation unit 4 14. Based on the position information of the transfer destination mobile station 300 and the position information of the transfer mobile station 200, the inter-station distance Δd between the mobile stations is calculated (S150). For example, the derivation unit 414 calculates the first inter-station distance Δd(p1,m1) based on the position information (xp1,yp1) of the first transfer destination mobile station 300a and the position information (xm1,ym1 ) of the first transfer mobile station 200a. a and the position information (xm1,ym1 ) of the first transfer mobile station 200a.

[0033] Δd(p1,m1)=(xm1,ym1)-(xp1,yp1) . Also, the derivation unit 414 derives the second inter-station distance Δd( p1,m2) based on the position information (xp1,yp1) of the first transfer destination mobile station 300a and the position information (xm2,ym2) of the second transfer mobile station 200b. .

[0034] Δd(p1,m2)=(xm2,ym2)-(xp1,yp1) . The derivation unit 414 calculates the relative velocity vector based on the velocity vector of the transfer destination mobile station 300 and the velocity vector of the transfer mobile station 200 (S152). For example, the derivation unit 414 calculates the relative velocity vector based on the velocity vector Vp1 of the first transfer destination mobile station 300a and the velocity vector V of the first transfer mobile station 200a . For example, the derivation unit 414 calculates the relative velocity vector based on the velocity vector Vp1 of the first transfer destination mobile station 300a and the velocity vector V of the first transfer mobile station 200a of the first transfer destination mobile station 300a and the velocity vector V of the first transfer mobile station 200a Based on m1, the first relative velocity vector Δv(p1, m1) is derived.

[0035] Δv(p1, m1) = Vm1 - Vp1 Also, the derivation unit 414 derives the second relative velocity vector Δv(p1, m2) based on the velocity vector Vp1 of the first transferred mobile station 300a and the velocity vector Vm2 of the second transfer mobile station 200b. Derive.

[0036] Δv(p1, m2) = Vm2 - Vp1 The derivation unit 414 stores the inter-mobile station distance and the relative velocity vector in the storage unit 412. FIG. 10 shows yet another data structure of the state table stored in the storage unit 412. As shown in the figure As such, the inter-mobile station distance and the relative velocity vector for various combinations of the transfer mobile station 200 and the transferred mobile station 300 are stored.

[0037] The determination unit 416 determines whether the difference is large based on the inter-mobile station distance and the relative velocity vector within the same group (S154). For example, the determination unit 416 determines whether the first inter-mobile station distance Δd( p1, m1) is greater than the first threshold value and whether the first relative velocity vector Δv(p1, m1 ) is in the direction of increasing the first inter-mobile station distance. Here, the first threshold value is determined according to the transmission power of the first transfer mobile station 200a. For example, the greater the transmission power of the first transfer mobile station 200a , the greater the first threshold value. If such conditions are met (Y in S154), the determination unit 416 determines that the second inter-mobile station distance Δd(p1, m2) is less than or equal to the second threshold value and that the second relative velocity vector Δv(p1, m2) is not in the direction of increasing the second inter-mobile station distance Δd (p1, m2), then if the second transfer mobile station 200b causes the base station 10 to... ... ... Determine to switch the relay between the base station 100 and the first mobile station to be relayed 300a (S156). Here, the second threshold is determined according to the transmission power of the second relay mobile station 200b. For example , as the transmission power of the second relay mobile station 200b increases, the second threshold is increased.

[0038] If the second inter-mobile station distance Δd(p1,m2) is greater than the second threshold, or the second relative speed vector Δv(p1,m2) is in the direction of increasing the second inter-mobile station distance Δd(p1,m2), no switching is performed. In such a process, the relay mobile station 200 close to the mobile station to be relayed 300 is selected. Also, the relay mobile station 200 with a small Δv whose speed away from the mobile station to be relayed 300 is small is selected. Furthermore, the relay mobile station 200 with a Δv approaching the mobile station to be relayed 300 is selected.

[0039] On the other hand, when the above-mentioned conditions are not satisfied (N in S154), for example, when the first inter-mobile station distance Δd( p1,m1) is less than or equal to the first threshold, or the first relative speed vector Δv(p1, m1) is in the direction that does not increase the first inter-mobile station distance, the determination unit 416 determines to maintain the relay between the base station 100 and the first mobile station to be relayed 300a by the first relay mobile station 200a (S158). In this way, the determination unit 416 determines whether to maintain the relay between the base station 100 and the first mobile station to be relayed 300a by the first relay mobile station 200a or to switch to the relay between the base station 100 and the first mobile station to be relayed 300a by the second relay mobile station 200b based on the first inter-mobile station distance Δd(p1, m1), the first relative speed vector Δv(p1,m1), the second inter-mobile station distance Δd(p1,m2 ), and the second relative speed vector Δv(p1,m2). ​​​​​​It is determined. The same processing is performed for other combinations of the transfer mobile station 200 and the transfer destination mobile station 300. Return to FIG. 8. Processing is performed. Return to FIG. 8.

[0040] When reallocation is necessary (Y in S106), the determination unit 416 executes allocation reflection processing (S108). In the allocation reflection processing, for example, when it is determined to switch to relaying between the base station 100 and the first transfer destination mobile station 300a by the second transfer mobile station 200b, the first transfer destination mobile station 300a is excluded from the group of the first transfer mobile station 200a, and the first transfer destination mobile station 300a is added to the group of the second transfer mobile station 200b. The instruction unit 418 notifies the transfer mobile station 200 of the allocation of the transfer destination mobile station 300 (S110). For example, the instruction unit 418 notifies the first transfer mobile station 200a of the exclusion of the first transfer destination mobile station 300a and notifies the second transfer mobile station 200b of the addition of the first transfer destination mobile station 300a. Such notification is made via the base station 100. In the allocation reflection processing, for example, when it is determined to switch to relaying between the base station 100 and the first transfer destination mobile station 300a by the second transfer mobile station 200b, When it is determined to switch to relaying between the base station 100 and the first transfer destination mobile station 300a by the second transfer mobile station 200b, the first transfer destination mobile station 300a is excluded from the group of the first transfer mobile station 200a, and the first transfer destination mobile station 300a is added to the group of the second transfer mobile station 200b. The instruction unit 418 notifies the transfer mobile station 200 of the allocation of the transfer destination mobile station 300 (S110). For example, the instruction unit 418 notifies the first transfer mobile station 200a of the exclusion of the first transfer destination mobile station 300a and notifies the second transfer mobile station 200b of the addition of the first transfer destination mobile station 300a. Such notification is made via the base station 100. the first transfer destination mobile station 300a is excluded from the group of the first transfer mobile station 200a, and the first transfer destination mobile station 300a is added to the group of the second transfer mobile station 200b. The instruction unit 418 notifies the transfer mobile station 200 of the allocation of the transfer destination mobile station 300 (S110). For example, the instruction unit 418 notifies the first transfer mobile station 200a of the exclusion of the first transfer destination mobile station 300a and notifies the second transfer mobile station 200b of the addition of the first transfer destination mobile station 300a. Such notification is made via the base station 100. the first transfer destination mobile station 300a is excluded from the group of the first transfer mobile station 200a, and the first transfer destination mobile station 300a is added to the group of the second transfer mobile station 200b. The instruction unit 418 notifies the transfer mobile station 200 of the allocation of the transfer destination mobile station 300 (S110). For example, the instruction unit 418 notifies the first transfer mobile station 200a of the exclusion of the first transfer destination mobile station 300a and notifies the second transfer mobile station 200b of the addition of the first transfer destination mobile station 300a. Such notification is made via the base station 100. For example, the instruction unit 418 notifies the first transfer mobile station 200a of the exclusion of the first transfer destination mobile station 300a and notifies the second transfer mobile station 200b of the addition of the first transfer destination mobile station 300a. For example, the instruction unit 418 notifies the first transfer mobile station 200a of the exclusion of the first transfer destination mobile station 300a and notifies the second transfer mobile station 200b of the addition of the first transfer destination mobile station 300a. Such notification is made via the base station 100. Such notification is made via the base station 100.

[0041] When notifying of the transfer role, the base station 100 may manage the frequency set so as not to overlap with the surrounding groups and add information on the optimal dedicated frequency to communicate with the transfer destination mobile station 300. Also, when notifying the surrounding mobile stations, the base station 100 may notify the information of the transfer destination mobile station 300 newly added and the transfer destination mobile station 300 excluded from the transfer (next transfer mobile station 200 information: UID, transfer frequency information, etc.). On the other hand, when reallocation is not necessary (N in S106), steps 108 and 110 are skipped. The determination unit 416 changes the state table of the storage unit 412 according to the determined content (S112), and completes the allocation (S114). Return to FIG. 3. When notifying of the transfer role, the base station 100 may manage the frequency set so as not to overlap with the surrounding groups and add information on the optimal dedicated frequency to communicate with the transfer destination mobile station 300. When notifying of the transfer role, the base station 100 may manage the frequency set so as not to overlap with the surrounding groups and add information on the optimal dedicated frequency to communicate with the transfer destination mobile station 300. Also, when notifying the surrounding mobile stations, the base station 100 may notify the information of the transfer destination mobile station 300 newly added and the transfer destination mobile station 300 excluded from the transfer (next transfer mobile station 200 information: UID, transfer frequency information, etc.). Also, when notifying the surrounding mobile stations, the base station 100 may notify the information of the transfer destination mobile station 300 newly added and the transfer destination mobile station 300 excluded from the transfer (next transfer mobile station 200 information: UID, transfer frequency information, etc.). On the other hand, when reallocation is not necessary (N in S106), steps 108 and 110 are skipped. The determination unit 416 changes the state table of the storage unit 412 according to the determined content (S112), and completes the allocation (S114). Return to FIG. 3. On the other hand, when reallocation is not necessary (N in S106), steps 108 and 110 are skipped. The determination unit 416 changes the state table of the storage unit 412 according to the determined content (S112), and completes the allocation (S114). Return to FIG. 3. On the other hand, when reallocation is not necessary (N in S106), steps 108 and 110 are skipped. The determination unit 416 changes the state table of the storage unit 412 according to the determined content (S112), and completes the allocation (S114). Return to FIG. 3. The determination unit 416 changes the state table of the storage unit 412 according to the determined content (S112), and completes the allocation (S114). Return to FIG. 3.

[0042] If the process has not been completed for all mobile stations (N in S24), return to step 12. When the processing for the mobile station is completed (Y in S24), the processing is terminated. If so (Y in S16), the acquisition unit 410 executes a timeout process (S26). FIG. 11 is also used to explain the timeout process. 1 is a flowchart showing a time-out procedure. The acquisition unit 410 acquires a number of missed calls (without a response). A mobile station is identified (S200), and the state table stored in the storage unit 412 is changed (S2 02). Specifically, the identified mobile station is set as the forwarded mobile station 300. Updating the state table After that, the update is completed (S204).

[0043] In terms of hardware, this configuration can be implemented using the CPU, memory, and other L This can be achieved with SI, and in terms of software, it can be achieved by programs loaded into memory, etc. Here, we have depicted the functional blocks that are realized by linking these components. Therefore, these functional blocks may be hardware only, software only, or a combination of both. Those skilled in the art will understand that this can be achieved in various ways.

[0044] According to this embodiment, the first mobile station distance, the first relative velocity vector, the second mobile station distance, 2. Based on the relative velocity vector, the current combination of the transferring mobile station 200 and the transferred mobile station 300 is Therefore, the transfer mobile station 200 and the transferred mobile station 300 decide whether to maintain or change the transfer ratio. These combinations can be changed when at least one of the first mobile station moves. The distance between the first mobile station and the second mobile station is greater than a first threshold value, and the first relative velocity vector increases the distance between the first mobile station and the second mobile station. When it is the direction to cause addition, if the second mobile station - to - mobile station distance is less than or equal to the second threshold value and the second relative speed vector is in the direction that does not increase the second mobile station - to - mobile station distance, determine the change of the combination Therefore, the relay switching can be executed smoothly. Also, when the first mobile station - to - mobile station distance is less than or equal to the first threshold value or the first relative speed vector is in the direction that does not increase the first mobile station - to - mobile station distance maintain the combination, so the relay can be maintained. Also, since the first threshold value is determined according to the transmission power of the first transfer mobile station, the first threshold value can be set appropriately. Also, since the second threshold value is determined according to the transmission power of the second transfer mobile station, the second threshold value can be set appropriately .

[0045] As described above, the present invention has been described based on the embodiments. In the embodiments, voice signals have been described, but it is not limited thereto, and information signals such as data signals may also be used. These embodiments are illustrative, and it is understood by those skilled in the art that various modifications are possible for each of these constituent elements and combinations of each processing process, and such modifications are also within the scope of the present invention.

Explanation of Reference Numerals

[0046] 100 Base station, 200 Transfer mobile station, 300 Transferred mobile station, 400 Management device , 410 Acquisition unit, 412 Storage unit, 414 Derivation unit, 416 Determination unit, 4 18 Instruction unit, 1000 Communication system.

Claims

1. A base station forming a communication service area where communication is possible, and a mobile station located outside the communication service area A communication system including a mobile station to be transferred and a mobile station located within the communication service area. A management device for managing a system, Based on the transmission output and the moving speed of the mobile station located within the communication service area, a role determination unit that determines whether the role of the mobile station is a transfer mobile station or not Equipped Management device.

2. A base station forming a communication service area where communication is possible, and a mobile station located outside the communication service area A communication system including a mobile station to be transferred and a mobile station located within the communication service area. A method for managing a system, comprising: Based on the transmission output and the moving speed of the mobile station located within the communication service area, a role determination step of determining whether the role of the mobile station is a transferring mobile station or not Includes Management method.

3. A base station forming a communication service area where communication is possible, and a mobile station located outside the communication service area A communication system including a mobile station to be transferred and a mobile station located within the communication service area. A management program executed by a computer that operates as a management device for managing a system, Based on the transmission output and the moving speed of the mobile station located within the communication service area, a role determination step of determining whether the role of the mobile station is a transferring mobile station or not Includes Management program.

Images