JP2014086921A - Communication facility device for discriminating whether mobile station is connected via repeater station, method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication facility device for discriminating whether a mobile station establishes a radio link with a base station or a repeater station, without grasping positions of the base station and the repeater station beforehand.SOLUTION: The communication facility device comprises: delay time acquisition means for acquiring, from a base station or a repeater station, a delay time between the base station or the repeater station and each of mobile stations at two time points regarding the mobile station; delay time difference calculation means for calculating a delay time difference which is a difference between two delay times; mobile station classification means for classifying a plurality of mobile stations into groups for each unit time range in the order starting from the largest delay time; average delay time difference calculation means for calculating an average delay time difference which is an average value of delay time differences in the mobile stations for each of the groups; and communication station determination means for determining that, regarding the mobile stations belonging to at least two groups in the order starting from the smallest average delay time difference, a mobile station belonging to a group of the larger delay time establishes a radio link with the repeater station.

Description

  The present invention relates to a technology of a radio communication system in which a relay station is arranged under a base station.

  Conventionally, there is a technique for positioning using a radio wave arriving from a base station without using a positioning function such as GPS (Global Positioning System) for positioning the current position in a mobile station (see, for example, Patent Document 1). ). According to this technique, the current position of the mobile station is measured using incoming radio waves from at least three base stations. First, radio wave propagation conditions around each base station are measured in advance, and a predetermined error correction coefficient is calculated. Next, at least one or more radio waves that are direct waves from the incoming radio waves are estimated using the error correction coefficient and the position information of each base station. Next, a time difference between the time when the base station transmits radio waves and the time until the mobile station receives the radio waves transmitted from the base station is calculated. Then, using the time difference, the current position of the mobile station is measured.

In addition, there is a technique that can estimate the position of a wireless communication system in which a relay station is arranged under a base station to expand the reach of radio waves, even if it is a mobile station that communicates with the relay station (for example, a patent) Reference 2). According to this technology, the positions of the base station and the relay station need to be recognized (set) in advance. In addition, the following three distances are used.
Distance from base station to relay station BRD
The distance RMD from the mobile station to the relay station calculated from the delay time between the mobile station and the relay station
Distance R between the base station and the center position of the cell sector
And it determines according to conditions as follows.
(Condition 1) If the position away from the base station in the direction of the relay station by BRD + RMD is outside the circle of radius R centering on the cell sector, the position of the mobile station is the center of the cell sector.
(Condition 2) If the position that is BRD + RMD away from the base station in the direction of the relay station is within a circle of radius R centered on the cell sector, the position of the mobile station is the position that is BRD + RMD away from the base station in the direction of the relay station And

  Furthermore, there is a technique for determining whether the position of the mobile station is within the communication range of the base station or the communication range of the relay station (see, for example, Patent Document 3). According to this technique, a threshold curve for separating the communication range of the base station and the communication range of the relay station from the relationship between the propagation delay value and the propagation loss value created in advance is used. Using the threshold curve, it is determined from the propagation delay value and propagation loss value from the mobile station to the base station whether the position of the mobile station is within the communication range of the base station or the relay station.

JP 2002-291026 A JP 2009-267626 A JP 2006-020043 A

  However, according to the technique described in Patent Document 1, a sufficient number of base stations are arranged around the mobile station in order to use radio waves including direct waves from at least three base stations for positioning of the position of the mobile station. Need to be. Further, a coefficient for correcting the error of the incoming radio wave is necessary, and in order to calculate this coefficient, it is necessary to measure the radio wave propagation environment around the base station in advance. Furthermore, it cannot be determined whether the incoming radio wave is a radio wave transmitted from a base station or a relay station.

  Further, according to the technique described in Patent Document 2, it is possible to perform positioning of a mobile station via a relay station. As a positioning condition, the center position of a cell sector of a base station and its radius are determined based on the base station. Need to know in advance. Also, relay stations outside the sector radius are not subject to positioning. Furthermore, since the relay station is within the sector of the cell, there is a possibility that the relay station is directly communicating with the base station, and it is determined whether the mobile station is communicating with either the base station or the relay station. Separate processing is required.

  Furthermore, according to the technique described in Patent Document 3, it is necessary to prepare in advance a determination threshold curve for determining whether a mobile station is communicating with a base station or a relay station. In addition, considering the influence of the surrounding multipath and the distance between the base station and the relay station in the environment of the base station and the relay station, the determination threshold curve indicating the relationship between the propagation delay value and the propagation loss position is not constant, and the specific threshold curve Only the base station and the relay station can make the determination.

  Therefore, the present invention provides a communication equipment apparatus and method capable of determining whether a mobile station has established a radio link with a base station or a relay station without previously knowing the positions of the base station and the relay station. And to provide a program.

According to the present invention, for a wireless communication system having a base station, a relay station installed under the base station, and a plurality of mobile stations capable of communicating with the base station and the relay station, the mobile station Or a communication equipment device for determining whether the relay station is located nearby,
Delay time acquisition means for acquiring a delay time between the base station or relay station and the mobile station at two different points in time for each mobile station from the base station or relay station;
A delay time difference calculating means for calculating a delay time difference which is a difference between the first delay time and the second delay time for each mobile station;
Mobile station classification means for classifying a plurality of mobile stations into groups for each unit time width in order from the largest delay time,
For each group, an average delay time difference calculating means for calculating an average delay time difference that is an average value of the delay time differences in the mobile station,
For mobile stations belonging to at least two groups in order from the smallest average delay time difference, the mobile stations belonging to the group with the larger delay time include communication station determination means for determining that a radio link has been established with the relay station. It is characterized by having.

According to another embodiment of the communication equipment of the present invention,
The delay time acquisition means for each mobile station
A first delay time after establishment of a communication link with a base station or a relay station;
It is also preferable to obtain the second delay time at the time before the communication link is disconnected with the base station or the relay station.

According to another embodiment of the communication equipment of the present invention,
A determination delay time storage means for storing, as a determination delay time, an average value of the second delay times in the mobile stations belonging to the group with the larger delay time determined by the communication station determination means;
When the second delay time of the mobile station acquired from the base station by the delay time acquisition means is greater than the discriminant value delay time, the communication station determination means has established a radio link with the relay station. It is also preferable to determine that

  According to another embodiment of the communication facility apparatus of the present invention, the unit time width in the mobile station classification means is also preferably divided into predetermined unit time widths in order from the shorter second delay time. .

According to another embodiment of the communication equipment of the present invention,
The communication station determination means is
For each group i, a first feature amount calculating means for calculating a first feature amount β i obtained by dividing the average delay time difference by the accumulated value of the unit time width of the group,
For the first feature value βi of each group i, a weighted average second feature value γ is obtained by subtracting the feature value βi from a group feature value βi + I that is larger than the accumulated value of the group i by a predetermined value I. A second feature amount calculating means for calculating
The communication station determination means, for mobile stations belonging to at least two groups in order from the smallest second feature quantity γ, the mobile stations belonging to the group having the second smallest feature quantity γ It is also preferable to determine that it is established.

According to the present invention, for a wireless communication system having a base station, a relay station installed under the base station, and a plurality of mobile stations capable of communicating with the base station and the relay station, the mobile station Or a communication station determination method in a communication equipment device that determines which of the relay stations is located nearby,
A first step of obtaining, from the base station or relay station, a delay time between the base station or relay station and the mobile station at two different time points for each mobile station;
For each mobile station, a second step of calculating a delay time difference that is a difference between the first delay time and the second delay time;
A third step of classifying the plurality of mobile stations into groups for each unit time width in order from the largest delay time;
For each group, a fourth step of calculating an average delay time difference that is an average value of the delay time differences in the mobile station;
For mobile stations belonging to at least two groups in order from the smallest average delay time difference, the mobile station belonging to the group with the larger delay time determines the fifth step of determining that a radio link has been established with the relay station. It is characterized by having.

According to another embodiment of the communication station determination method of the present invention,
The first step is for each mobile station
A first delay time after establishment of a communication link with a base station or a relay station;
It is also preferable to obtain the second delay time at the time before the communication link is disconnected with the base station or the relay station.

According to another embodiment of the communication station determination method of the present invention,
The fifth step is
The average value of the second delay times in the mobile stations belonging to the group with the larger delay time is stored as a discrimination delay time,
If the second delay time of the mobile station acquired from the base station in the first step is greater than the discriminant value delay time, the mobile station determines that the radio link has been established with the relay station Is also preferable.

  According to another embodiment of the communication station determination method of the present invention, the unit time width in the third step may be divided into predetermined unit time widths in order from the shorter second delay time. preferable.

According to another embodiment of the communication station determination method of the present invention,
The fifth step is
For each group i, a first feature amount β i is calculated by dividing the average delay time difference by the cumulative value of the unit time width of the group,
For the first feature value βi of each group i, a weighted average second feature value γ is obtained by subtracting the feature value βi from a group feature value βi + I that is larger than the accumulated value of the group i by a predetermined value I. To calculate
For mobile stations belonging to at least two groups in order from the smallest second feature value γ, the mobile stations belonging to the group having the second smallest feature value γ have established a radio link with the relay station. It is also preferable to determine.

According to the present invention, for a wireless communication system having a base station, a relay station installed under the base station, and a plurality of mobile stations capable of communicating with the base station and the relay station, the mobile station Or a communication station determination program for causing a computer installed in a communication equipment device to determine which of the relay stations is located nearby,
Delay time acquisition means for acquiring a delay time between the base station or relay station and the mobile station at two different points in time for each mobile station from the base station or relay station;
A delay time difference calculating means for calculating a delay time difference which is a difference between the first delay time and the second delay time for each mobile station;
Mobile station classification means for classifying a plurality of mobile stations into groups for each unit time width in order from the largest delay time,
For each group, an average delay time difference calculating means for calculating an average delay time difference that is an average value of the delay time differences in the mobile station,
For mobile stations belonging to at least two groups in order from the smallest average delay time difference, the mobile stations belonging to the group with the larger delay time determine that the mobile station has established a radio link with the relay station. Is made to function.

  According to the communication equipment, method, and program of the present invention, it is determined whether a mobile station has established a radio link with a base station or a relay station without previously knowing the positions of the base station and the relay station. be able to.

It is a system block diagram showing the reach | attainment range of the electromagnetic wave from a base station. It is a system configuration diagram in which a relay station is arranged under a base station in the present invention. It is a functional block diagram of the communication equipment apparatus in this invention. It is a system block diagram showing the delay time acquired by this invention. It is explanatory drawing showing the delay time difference calculated by this invention. It is explanatory drawing showing the relationship between the distance of the mobile station from a base station, and delay time difference. It is explanatory drawing showing the average delay time difference and feature-value calculated by this invention. It is explanatory drawing showing the relationship between the distance of the mobile station from a base station, and an average delay time difference. It is explanatory drawing showing the relationship between the distance of the mobile station from a base station, and feature-value (beta) and (gamma).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a system configuration diagram showing the reach of radio waves from a base station.

  According to the radio communication system of FIG. 1, the base station 2 and the plurality of mobile stations 4 communicate via radio. The base station 2 is connected to a mobile communication network that is operated and managed by a communication carrier. The mobile station 4 can be connected to the mobile communication network via the base station 2.

  According to FIG. 1, the arrival time of radio waves from the base station 2 and its range are represented by three types of wavy lines t1 to t3. As the wavy line becomes thinner, the time elapses (t1 <t2 <t3), and the radio wave reaches a farther range from the base station 2. On the other hand, the range of the radio wave is distorted and deformed as the wavy line becomes thinner, that is, as t3. This indicates that the influence of multipath increases as the radio wave reaches a wide range. Here, the greater the influence of multipath, the longer the round-trip delay time between the mobile station 4 and the base station 2.

According to FIG. 1, the mobile station 4 A is relatively close to the base station 2, while the mobile station 4 B is far from the base station 2. That is, the mobile station 4B is more greatly affected by multipath than the mobile station 4A. Here, when the mobile station 4A and the mobile station 4B move the same distance, the following relational phenomenon occurs due to the influence of multipath.
For the mobile station 4A, the time difference Ta between the round-trip delay time before movement and the round-trip delay time after movement
For the mobile station 4B, the time difference Tb between the round-trip delay time before moving and the round-trip delay time after moving
Time difference Ta <Time difference Tb

  FIG. 2 is a system configuration diagram in which relay stations are arranged under the base station in the present invention.

  According to the radio communication system of FIG. 2, the relay station 3 is arranged under the base station 2, and the mobile station 4 can communicate with the relay station 3 as well as the base station 2. Similarly to the base station 2, the relay station 3 is also connected to a mobile communication network that is operated and managed by a communication carrier. Here, according to the present invention, the communication equipment 1 is installed in the mobile communication network. The communication facility apparatus 1 can determine whether the mobile station is located near the base station or the relay station.

  FIG. 3 is a functional configuration diagram of the communication equipment apparatus according to the present invention.

  According to FIG. 3, the communication equipment 1 includes a communication interface 10 connected to a mobile communication network, a delay time acquisition unit 11, a delay time difference calculation unit 12, a mobile station separation unit 13, and an average delay time difference calculation unit. 14, a communication station determination unit 15, and a discrimination delay time storage unit 16. These functional components are realized by executing a program that causes a computer mounted on the communication equipment to function.

[Delay time acquisition unit 11]
The delay time acquisition unit 11 acquires from the base station 2 or the relay station 3 the delay time between the base station 2 or the relay station 3 and the mobile station 4 at two different times for each mobile station 4. The delay time is preferably a round trip delay time. Here, the delay times at two different time points in each mobile station are as follows.
First delay time after establishment of communication link with base station or relay station Second delay time before establishment of communication link with base station or relay station "After establishment of communication link" “Before disconnection” includes, for example, handover at the time of switching from the first base station to the second base station, connection to the base station, disconnection from the base station, and abnormal termination. Such a delay time may be obtained, for example, for a round trip delay time for one day for all mobile stations connected to one base station and all relay stations under the base station.

  FIG. 4 is a system configuration diagram showing the delay time acquired by the present invention.

  FIG. 4 shows a first time point when the mobile station 4A establishes a communication link with the base station 2 and a second time point when the communication link is disconnected. In addition, a first time point when the mobile station 4B establishes a communication link with the relay station 3 and a second time point when the communication link is disconnected are shown. The delay time at each time point is measured.

  In addition, about the connection equipment of the relay station 3 and a mobile communication network, the delay in equipment for a fixed time arises. Therefore, even if the distance between the relay station 3 and the mobile station 4B is relatively short and the delay time is short, the delay time through the relay station acquired as the communication equipment device 1 is increased by a certain time. End up.

[Delay time difference calculation unit 12]
The delay time difference calculation unit 12 calculates a delay time difference that is a difference between the first delay time and the second delay time for each mobile station.

  FIG. 5 is an explanatory diagram showing the delay time difference calculated by the present invention.

  FIG. 5 shows a mobile station table 1 </ b> A that records the delay time acquired by the delay time acquisition unit 11. According to the mobile station table 1A, for each mobile station identifier A to K, a first round trip delay time (n seconds), a second round trip delay time (n seconds), and a round trip delay time difference (n seconds) between them. And are represented. Further, the distance from the base station 2 is represented on the horizontal axis, and the distances of the mobile stations A to K viewed from the base station 2 are also represented.

  FIG. 6 is an explanatory diagram showing the relationship between the distance of the mobile station from the base station and the delay time difference.

  According to FIG. 6, mobile stations A and D are located near the base station 2, and mobile stations G and I are located near the relay station 3. Therefore, the round trip delay time difference (0.01 nsec) of the mobile station A close to the base station 2 and the round trip delay time difference (0.19 nsec) of the mobile station D and the round trip delay time difference (0 .18 nsec) and the mobile station I round-trip delay time difference (0.22 nsec) can be understood to be relatively short in view of the overall round-trip delay time difference.

[Mobile station separation unit 13]
The mobile station separation unit 13 classifies the plurality of mobile stations into groups for each unit time width in descending order of delay time. The unit time width in the mobile station separation unit 13 is divided into predetermined unit time widths in order from the shorter second delay time when the communication link is disconnected. The unit time may be 1 n seconds, for example.

According to the mobile station table of FIG. 5, the second delay time is classified into the following groups.
[Group] [Second delay time]
10 to 1n seconds
2 1-2n seconds
3 2-3n seconds
4 4-5 ns
5 5-6 ns
6 6-7 ns
7 7-8 ns

[Average delay time difference calculation unit 14]
The average delay time difference calculation unit 14 calculates an average delay time difference that is an average value of the delay time differences in the mobile station for each group.

  FIG. 7 is an explanatory diagram showing an average delay time difference and a feature amount calculated according to the present invention.

According to the group table 1B of FIG. 7, the average delay time difference is calculated for each group.
According to group 1, the delay time difference between mobile station identifiers A and D belonging to group 1 is 0.10 (= (0.01 + 0.19) / 2).
According to group 2, the average delay time difference between mobile station identifiers B and E belonging to group 2 is 0.30 (= (0.30 + 0.30) / 2).
According to the group 3, the average delay time difference in the mobile station identifier C belonging to the group 3 is 0.80.
According to group 4, the average delay time difference in the mobile station identifier J belonging to the group 4 is 0.90.
According to group 5, the average delay time difference between mobile station identifiers F and H belonging thereto is 1.00 (= (1.10 + 0.90) / 2).
According to the group 6, the average delay time difference between the mobile station identifiers G and I belonging to the group 6 is 0.20 (= (0.18 + 0.22) / 2).
According to the group 7, the average delay time difference in the mobile station identifier K belonging to the group 7 is 0.60.

  FIG. 8 is an explanatory diagram showing the relationship between the distance of the mobile station from the base station and the average delay time difference.

  According to FIG. 8, the average delay time difference in the group 1 of the mobile stations A and D close to the base station 2 and the average delay time difference in the group 6 of the mobile stations G and I close to the relay station are obtained from the overall average delay time difference. It can be seen that it is relatively small.

[Communication station determination unit 15]
The communication station determination unit 15 can determine whether or not the mobile station has established a radio link with the relay station by two different methods.

(First communication station determination method)
According to FIG. 3, the first communication station determination method is executed by the average delay time difference determination unit 151. The average delay time difference determination unit 151 determines that, for mobile stations belonging to at least two groups in order from the smallest average delay time difference, the mobile stations belonging to the group with the larger delay time have established a radio link with the relay station. judge. Referring to FIG. 8, groups 1 and 6 are selected in order from the smallest average delay time difference. Here, when the delay times of the mobile stations A and D belonging to the group 1 are compared with the delay times of the mobile stations G and I belonging to the group 6, the delay time of the group 6 is larger. Then, it can be determined that the mobile stations G and I belonging to the group 6 have established a radio link with the relay station 3.

  Here, the discrimination delay time storage unit 16 may be used. The discriminant delay time storage unit 16 stores, as the discriminant delay time, the average value of the second delay times in the mobile stations belonging to the group with the larger delay time determined by the communication station determining unit 15. According to FIG. 8, the average value 6.68 (= (6.77 + 6.50) / 2) of the second delay times in the mobile stations G and I belonging to the group 6 is stored as the discrimination delay time.

  When the discriminant delay time storage unit 16 is used, the communication station determination unit 15 determines that the mobile station determines that the second delay time of the mobile station acquired from the base station by the delay time acquisition unit 11 is greater than the discriminant value delay time. The station determines that a radio link has been established with the relay station.

(Second communication station determination method)
The second communication station determination method is executed by the first feature value calculation unit 152 and the second feature value calculation unit 153.

  FIG. 9 is an explanatory diagram showing the relationship between the distance of the mobile station from the base station and the feature amounts β and γ.

The first feature amount calculation unit 152 calculates, for each group i, a first feature amount βi obtained by dividing the average delay time difference by the accumulated value of the unit time width of the group.
For group 1, β1 = (average delay time difference 0.10 nsec) / (cumulative value 1 of group 1) = 0.10.
For group 2, β2 = (average delay time difference 0.30 nsec) / (cumulative value 2 of group 2) = 0.15.
For group 3, β3 = (average delay time difference 0.80 nsec) / (cumulative value 3 of group 3) = 0.27.
For group 4, β4 = (average delay time difference 0.90 nsec) / (cumulative value 4 of group 4) = 0.23.
For group 5, β5 = (average delay time difference 1.00 nsec) / (cumulative value 5 of group 5) = 0.20.
For group 6, β6 = (average delay time difference 0.20 nsec) / (cumulative value 6 of group 6) = 0.03.
For group 7, β7 = (average delay time difference 0.60 nsec) / (cumulative value 7 of group 7) = 0.09.

Next, the second feature value calculation unit 153 calculates the feature value βi from the feature value βi + I of the group that is larger than the accumulated value of the group i by a predetermined value I for the first feature value βi of each group i. The second feature value γ of the weighted average is calculated by subtracting. The second feature amount γ means an inclination with respect to the feature amount βi viewed from the feature amount βi + I. Further, a predetermined value I = 2 which is a determination length of inclination is set.
For group 1, γ1 = β3−β1 = 0.27−0.10 = 0.17.
For group 2, γ2 = β4-β2 = 0.23−0.15 = 0.08.
For group 3, γ3 = β5−β3 = 0.20−0.27 = −0.07.
For group 4, γ4 = β6-β4 = 0.03−0.23 = −0.20.
For group 5, γ5 = β7−β5 = 0.09−0.20 = −0.11.
For group 6, γ6 = β8−β6 = 0.15−0.03 = 0.12.
For group 7, γ7 = β9−β7 = 0.17−0.09 = 0.08.

  When the second feature amount γ representing the slope of each time unit is continuously positive and has an upward tendency, it can be understood that the second feature amount γ is approaching the base station or the relay station. On the other hand, when the second feature amount γ tends to decrease, it can be understood that the second feature amount γ is moving away from the base station or the relay station.

  Then, as the communication station determination unit 15, for mobile stations belonging to at least two groups in order from the smallest second feature quantity γ, the mobile stations belonging to the group having the second second feature quantity γ are relayed. It is determined that a radio link is established with the station.

According to FIG. 9, the maximum value of the second feature quantity γ is γm1, the distribution including γm1 is the first distribution, and the time unit is X.
Next, among the second feature amount γ excluding the first distribution including the maximum value γ1, the maximum value is γm2, the distribution including the γm2 is the second distribution, and the time unit is Y. To do.
Here, X and Y which are time units of γm1 and γm2 are compared, and if X <Y, it can be estimated that Y includes the equipment delay of the relay station. As a result, X can determine that a radio link has been established with the base station. On the other hand, Y can determine that a radio link has been established with the relay station.

  As described above in detail, according to the communication equipment apparatus, method and program of the present invention, the mobile station can communicate with either the base station or the relay station without knowing the positions of the base station and the relay station in advance. It can be determined whether a link is established.

  Various changes, modifications, and omissions of the above-described various embodiments of the present invention can be easily made by those skilled in the art. The above description is merely an example, and is not intended to be restrictive. The invention is limited only as defined in the following claims and the equivalents thereto.

DESCRIPTION OF SYMBOLS 1 Communication equipment 10 Communication interface 11 Delay time acquisition part 12 Delay time difference calculation part 13 Mobile station separation part 14 Average delay time difference calculation part 15 Communication station determination part 151 Average delay time difference determination part 152 1st feature-value calculation part 152 2nd Feature amount calculation unit 16 Discrimination delay time storage unit 2 Base station 3 Relay station 4 Mobile station

Claims (11)

A wireless communication system having a base station, a relay station installed under the base station, and a plurality of mobile stations capable of communicating with the base station and the relay station, the mobile station is configured to transmit the base station or the relay A communication equipment device for determining which station is located near,
A delay time acquisition means for acquiring a delay time between the base station or the relay station and the mobile station at two different time points for each mobile station from the base station or the relay station;
A delay time difference calculating means for calculating a delay time difference which is a difference between the first delay time and the second delay time for each mobile station;
Mobile station classification means for classifying a plurality of mobile stations into groups for each unit time width in order from the largest delay time,
For each group, an average delay time difference calculating means for calculating an average delay time difference that is an average value of the delay time differences in the mobile station;
Communication station determination means for determining, for mobile stations belonging to at least two groups in order from the smallest difference in average delay time, that the mobile station belonging to the group with the larger delay time has established a radio link with the relay station And a communication facility device. The delay time acquisition means for each mobile station,
A first delay time after establishment of a communication link with the base station or the relay station;
The communication equipment apparatus according to claim 1, wherein a second delay time at a time before the communication link is disconnected with the base station or the relay station is acquired. A determination delay time storage means for storing, as a determination delay time, an average value of the second delay times in the mobile stations belonging to the group with the larger delay time determined by the communication station determination means;
When the second delay time of the mobile station acquired from the base station by the delay time acquisition unit is larger than the discriminant value delay time, the communication station determination unit determines that the mobile station and the relay station The communication equipment according to claim 2, wherein it is determined that a link has been established.   The unit time width in the mobile station classification means is divided into predetermined unit time widths in order from the shortest second delay time. 4. The communication equipment described. The communication station determination means includes
For each group i, a first feature amount calculating means for calculating a first feature amount βi obtained by dividing the average delay time difference by the accumulated value of the unit time width of the group;
For the first feature value βi of each group i, a weighted average second feature value γ is obtained by subtracting the feature value βi from a group feature value βi + I that is larger than the accumulated value of the group i by a predetermined value I. A second feature amount calculating means for calculating
For the mobile stations belonging to at least two groups in order from the smallest second feature value γ, the communication station determining means determines that the mobile stations belonging to the group having the second smallest feature value γ are the relay station and The communication equipment according to any one of claims 1 to 4, wherein it is determined that a wireless link is established. A wireless communication system having a base station, a relay station installed under the base station, and a plurality of mobile stations capable of communicating with the base station and the relay station, the mobile station is configured to transmit the base station or the relay A communication station determination method in a communication equipment device that determines which of the stations is located nearby,
A first step of acquiring, from the base station or relay station, a delay time between the base station or relay station and the mobile station at two different time points for each mobile station;
For each mobile station, a second step of calculating a delay time difference that is a difference between the first delay time and the second delay time;
A third step of classifying the plurality of mobile stations into groups for each unit time width in order from the largest delay time;
For each group, a fourth step of calculating an average delay time difference that is an average value of the delay time differences in the mobile station;
Fifth step of determining, for mobile stations belonging to at least two groups in order from the smallest difference in average delay time, that the mobile station belonging to the group with the larger delay time has established a radio link with the relay station A communication station determination method characterized by comprising: The first step is for each mobile station
A first delay time after establishment of a communication link with the base station or the relay station;
The communication station determination method according to claim 6, wherein a second delay time at a time point before the communication link is disconnected with the base station or the relay station is acquired. The fifth step is
The average value of the second delay times in the mobile stations belonging to the group with the larger delay time is stored as a discrimination delay time,
If the second delay time of the mobile station acquired from the base station in the first step is greater than the discriminant value delay time, the mobile station has established a radio link with the relay station; The communication station determination method according to claim 7, wherein determination is performed.   9. The unit time according to claim 6, wherein the unit time width in the third step is divided into predetermined unit time widths in order from the shorter second delay time. 10. Communication station determination method. The fifth step is
For each group i, a first feature value β i is calculated by dividing the average delay time difference by the cumulative value of the unit time width of the group,
For the first feature value βi of each group i, a weighted average second feature value γ is obtained by subtracting the feature value βi from a group feature value βi + I that is larger than the accumulated value of the group i by a predetermined value I. To calculate
For mobile stations belonging to at least two groups in order from the smallest second feature value γ, the mobile stations belonging to the group having the second smallest feature value γ have established a radio link with the relay station. The communication station determination method according to claim 6, wherein the communication station determination method is determined. A wireless communication system having a base station, a relay station installed under the base station, and a plurality of mobile stations capable of communicating with the base station and the relay station, the mobile station is configured to transmit the base station or the relay A communication station determination program for causing a computer installed in a communication equipment device to determine which station is located nearby,
A delay time acquisition means for acquiring a delay time between the base station or the relay station and the mobile station at two different time points for each mobile station from the base station or the relay station;
A delay time difference calculating means for calculating a delay time difference which is a difference between the first delay time and the second delay time for each mobile station;
Mobile station classification means for classifying a plurality of mobile stations into groups for each unit time width in order from the largest delay time,
For each group, an average delay time difference calculating means for calculating an average delay time difference that is an average value of the delay time differences in the mobile station;
Communication station determination means for determining, for mobile stations belonging to at least two groups in order from the smallest difference in average delay time, that the mobile station belonging to the group with the larger delay time has established a radio link with the relay station A communication station determination program characterized by causing a computer to function as:

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