JP2010232945A - Radio communication system, radio communication path selection method, and radio communication routing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To select the most preferable transmission path when a plurality of selectable transmission paths exit. <P>SOLUTION: A wireless communication system includes a base station device, a mobile communication terminal, and a relay station device relaying data transmission between the base station device and the mobile communication terminal. In the system, the mobile communication terminal includes an information collecting means for collecting information required to obtain evaluation values of communication qualities of first and second transmission paths respectively, and a path selecting means for obtaining evaluation values of the first and second transmission paths using the information required to obtain the evaluation values of the communication qualities and selecting a transmission path on which a good evaluation value has been obtained as a transmission path to be used. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wireless communication system, a wireless communication route selection method, and a wireless communication route selection program.

  In recent mobile communication systems, higher radio quality is required compared to conventional communication systems only for calls, and the transmission power of mobile terminal stations is limited by restrictions such as power supply capacity. It has become difficult to expand the radio area covered by the station. Therefore, for the purpose of expanding the communication service area and improving the communication quality, a relay station (relay station) is arranged at the far end of the communication service area or in the radio wave insensitive zone so that the radio base station and the mobile communication terminal station A relay communication system that performs relay communication via a relay station is used (for example, see Patent Document 1).

JP 2008-60951 A

  In a wireless communication system between a base station and a mobile communication terminal (hereinafter referred to as a mobile station) via a relay station, the mobile station and the base are determined based on reception quality and reception power measured between the mobile station, the relay station, and the base station. When deciding whether to communicate via a transmission path between stations or via a relay station, make an optimal decision in terms of radio resources to be used, relative movement speed, interference with other cells, and delay time However, there is a problem that frequent handover, large resource consumption, and increase in delay time may be caused.

  For example, when it is necessary to select one of two transmission paths, either via a relay station or directly communicating with a base station, at the stage of establishing a call connection, the mobile station and relay station move after the call connection, etc. As a result, the situation at the start of call connection is not necessarily maintained because the situation of the transmission path changes greatly, and the path to be selected may change from the viewpoint of resource consumption, moving speed, interference quantity, and delay time. Discrimination based only on the reception quality and path loss value calculated from the reception level of the conventional communication method has a problem that the selection accuracy deteriorates.

  The present invention has been made in view of such circumstances, and when performing communication between a base station and a mobile station, the most preferable transmission path can be selected when there are a plurality of selectable transmission paths. An object of the present invention is to provide a possible wireless communication system, a wireless communication route selection method, and a wireless communication route selection program.

  The present invention comprises a base station apparatus, a mobile communication terminal, and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal, A first transmission path that performs data transmission using one transmission path; a second transmission path between the base station apparatus and the relay station apparatus; and a third transmission path between the relay station apparatus and the mobile communication terminal. In a wireless communication system in which a plurality of paths can be used with a second transmission path that performs data transmission using a transmission path, the mobile communication terminal communicates with each of the first and second transmission paths. Using information necessary for obtaining an evaluation value of the communication quality when establishing a wireless connection with the information collection means for collecting information necessary for obtaining an evaluation value of quality and the base station device, The evaluation values of the first and second transmission paths are assigned Each determined, characterized by comprising a path selection means for selecting as the transmission path to be used a transmission path better evaluation value is obtained.

  The present invention comprises a base station apparatus, a mobile communication terminal, and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal, A first transmission path that performs data transmission using one transmission path; a second transmission path between the base station apparatus and the relay station apparatus; and a third transmission path between the relay station apparatus and the mobile communication terminal. A plurality of second transmission paths that perform data transmission using a transmission path, and a third transmission path that performs data transmission using the first transmission path and the second transmission path simultaneously. In the wireless communication system in which the path can be used, the mobile communication terminal collects information necessary for obtaining evaluation values of communication quality of the first, second and third transmission paths. And establishing a wireless connection with the base station device In addition, using the information necessary for obtaining the evaluation value of the communication quality, the evaluation values of the first, second, and third transmission paths are obtained, respectively, and the transmission path with the good evaluation value is used. Route selection means for selecting a transmission route to be transmitted.

  According to the present invention, the route selection means calculates the evaluation value during establishment of the wireless connection, and uses a transmission route from which an evaluation value better than the evaluation value of the currently connected transmission route is obtained. It is characterized by selecting and changing the transmission path to be used.

  The present invention comprises a base station apparatus, a mobile communication terminal, and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal, A first transmission path that performs data transmission using one transmission path; a second transmission path between the base station apparatus and the relay station apparatus; and a third transmission path between the relay station apparatus and the mobile communication terminal. In a wireless communication system in which a plurality of paths can be used with a second transmission path that performs data transmission using a transmission path, the base station device communicates with each of the first and second transmission paths. Using information necessary for obtaining the evaluation value of the communication quality when establishing a wireless connection with the information collection means for collecting information necessary for obtaining the evaluation value of quality and the mobile communication terminal, The evaluation values of the first and second transmission paths are assigned Each determined, characterized by comprising a path selection means for selecting as the transmission path to be used a transmission path better evaluation value is obtained.

  The present invention comprises a base station apparatus, a mobile communication terminal, and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal, A first transmission path that performs data transmission using one transmission path; a second transmission path between the base station apparatus and the relay station apparatus; and a third transmission path between the relay station apparatus and the mobile communication terminal. A plurality of second transmission paths that perform data transmission using a transmission path, and a third transmission path that performs data transmission using the first transmission path and the second transmission path simultaneously. In the wireless communication system in which the path can be used, the base station apparatus collects information necessary for obtaining evaluation values of communication quality of the first, second and third transmission paths. And establishing a wireless connection with the mobile communication terminal In addition, using the information necessary for obtaining the evaluation value of the communication quality, the evaluation values of the first, second, and third transmission paths are obtained, respectively, and the transmission path with the good evaluation value is used. Route selection means for selecting a transmission route to be transmitted.

  According to the present invention, the route selection means calculates the evaluation value during establishment of the wireless connection, and uses a transmission route from which an evaluation value better than the evaluation value of the currently connected transmission route is obtained. It is characterized by selecting and changing the transmission path to be used.

  According to the present invention, the information necessary for obtaining the evaluation value of the communication quality is at least one of a use frequency band, a transmission time, a propagation loss value, a propagation loss fluctuation value width, a relative movement speed, and a transmission power value. Features.

  In the present invention, the route selection means may select the transmission route selected by obtaining the evaluation value of one or both of an uplink transmission route and a downlink transmission route as a transmission route to be used for the uplink and the downlink. It is characterized by selecting.

  In the present invention, the route selection means obtains the evaluation values of the uplink transmission route and the downlink transmission route, and selects a transmission route having a good evaluation value for each of the uplink and the downlink as a transmission route to be used. It is characterized by that.

  The present invention is characterized in that the mobile communication terminal further comprises display means for displaying information that can identify a transmission path used during establishment of a wireless connection.

  The present invention comprises a base station apparatus, a mobile communication terminal, and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal, A first transmission path that performs data transmission using one transmission path; a second transmission path between the base station apparatus and the relay station apparatus; and a third transmission path between the relay station apparatus and the mobile communication terminal. A wireless communication path selection method in a wireless communication system in which a plurality of paths can be used among second transmission paths that perform data transmission using a transmission path, wherein the mobile communication terminal includes the first and the second transmission paths. An information collecting step for collecting information necessary for obtaining communication quality evaluation values of the second transmission paths, and for obtaining the communication quality evaluation values when establishing a wireless connection with the base station device; Using the information necessary for And determine the evaluation value of the second transmission path, respectively, and having a path selection step of selecting a transmission path to be used a transmission path better evaluation value is obtained.

  The present invention comprises a base station apparatus, a mobile communication terminal, and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal, A first transmission path that performs data transmission using one transmission path; a second transmission path between the base station apparatus and the relay station apparatus; and a third transmission path between the relay station apparatus and the mobile communication terminal. A plurality of second transmission paths that perform data transmission using a transmission path, and a third transmission path that performs data transmission using the first transmission path and the second transmission path simultaneously. A wireless communication route selection method in a wireless communication system in which the route can be used, and is required when the mobile communication terminal obtains an evaluation value of communication quality of each of the first, second and third transmission routes. Information collecting step for collecting various information, and When establishing a wireless connection with the ground station device, the evaluation values of the first, second, and third transmission paths are obtained using information necessary for obtaining the evaluation value of the communication quality, respectively. And a route selection step of selecting a transmission route for which an evaluation value is obtained as a transmission route to be used.

  The present invention comprises a base station apparatus, a mobile communication terminal, and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal, A first transmission path that performs data transmission using one transmission path; a second transmission path between the base station apparatus and the relay station apparatus; and a third transmission path between the relay station apparatus and the mobile communication terminal. A wireless communication path selection method in a wireless communication system in which a plurality of paths can be used among the second transmission paths that perform data transmission using a transmission path, wherein the base station device includes the first and the second transmission paths. An information collecting step for collecting information necessary for obtaining a communication quality evaluation value of each of the second transmission paths, and for obtaining the communication quality evaluation value when establishing a wireless connection with the mobile communication terminal; Using the information necessary for And determine the evaluation value of the second transmission path, respectively, and having a path selection step of selecting a transmission path to be used a transmission path better evaluation value is obtained.

  The present invention comprises a base station apparatus, a mobile communication terminal, and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal, A first transmission path that performs data transmission using one transmission path; a second transmission path between the base station apparatus and the relay station apparatus; and a third transmission path between the relay station apparatus and the mobile communication terminal. A plurality of second transmission paths that perform data transmission using a transmission path, and a third transmission path that performs data transmission using the first transmission path and the second transmission path simultaneously. A wireless communication route selection method in a wireless communication system in which the route can be used, and is necessary when the base station apparatus obtains evaluation values of communication quality of the first, second and third transmission routes. Information collecting step for collecting various information, and the transfer When establishing a wireless connection with a communication terminal, the evaluation values of the first, second, and third transmission paths are obtained using information necessary for obtaining the evaluation value of the communication quality, and good evaluation is performed. And a route selection step of selecting the transmission route from which the value is obtained as a transmission route to be used.

  The present invention comprises a base station apparatus, a mobile communication terminal, and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal, A first transmission path that performs data transmission using one transmission path; a second transmission path between the base station apparatus and the relay station apparatus; and a third transmission path between the relay station apparatus and the mobile communication terminal. A wireless communication path selection program that operates on a wireless communication system that can use a plurality of paths among second transmission paths that perform data transmission using a transmission path, the computer in the mobile communication terminal The information collection step for collecting information necessary for obtaining the communication quality evaluation values of the first and second transmission paths, and the communication quality when establishing a wireless connection with the base station device. Find the evaluation value of A path selection step of obtaining an evaluation value of each of the first and second transmission paths by using necessary information and selecting a transmission path having a good evaluation value as a transmission path to be used. It is characterized by that.

  The present invention comprises a base station apparatus, a mobile communication terminal, and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal, A first transmission path that performs data transmission using one transmission path; a second transmission path between the base station apparatus and the relay station apparatus; and a third transmission path between the relay station apparatus and the mobile communication terminal. A plurality of second transmission paths that perform data transmission using a transmission path, and a third transmission path that performs data transmission using the first transmission path and the second transmission path simultaneously. A wireless communication route selection program that operates on a wireless communication system that can use a plurality of routes, wherein the computer in the mobile communication terminal evaluates the communication quality of each of the first, second, and third transmission routes. The information needed to determine the value The first, second and third transmission paths using information necessary for obtaining the evaluation value of the communication quality when establishing the wireless connection with the information collecting step and the base station device. And a route selection step of selecting a transmission route for which a good evaluation value is obtained as a transmission route to be used.

  The present invention comprises a base station apparatus, a mobile communication terminal, and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal, A first transmission path that performs data transmission using one transmission path; a second transmission path between the base station apparatus and the relay station apparatus; and a third transmission path between the relay station apparatus and the mobile communication terminal. A wireless communication path selection program that operates on a wireless communication system that can use a plurality of paths among second transmission paths that perform data transmission using a transmission path, the computer in the base station apparatus Information collection step for collecting information necessary for obtaining communication quality evaluation values of the first and second transmission paths, and when establishing a wireless connection with the mobile communication terminal, the communication quality Find the evaluation value of A path selection step of obtaining an evaluation value of each of the first and second transmission paths by using necessary information and selecting a transmission path having a good evaluation value as a transmission path to be used. It is characterized by that.

  The present invention comprises a base station apparatus, a mobile communication terminal, and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal, A first transmission path that performs data transmission using one transmission path; a second transmission path between the base station apparatus and the relay station apparatus; and a third transmission path between the relay station apparatus and the mobile communication terminal. A plurality of second transmission paths that perform data transmission using a transmission path, and a third transmission path that performs data transmission using the first transmission path and the second transmission path simultaneously. A wireless communication route selection program that operates on a wireless communication system that can use a plurality of routes, wherein the computer in the base station apparatus evaluates the communication quality of each of the first, second, and third transmission routes. Collect the information needed to determine the value Information collection step, and when establishing a wireless connection with the mobile communication terminal, information necessary for obtaining an evaluation value of the communication quality is used to determine the first, second and third transmission paths. Each of the evaluation values is obtained, and a route selection step of selecting a transmission route with a good evaluation value as a transmission route to be used is performed.

  According to the present invention, since the transmission path to be used is selected based on the evaluation value of the evaluation function of the transmission path used in each transmission path, there is an effect that the most preferable transmission path can be selected. It is done.

It is a figure which shows schematic structure of the mobile station, base station, and relay station which are used in the radio | wireless communications system of this invention. 3 is a flowchart showing a communication path selection operation of the mobile station shown in FIG.

  Hereinafter, a wireless communication system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. In this figure, reference numeral 1 denotes a mobile communication terminal (hereinafter referred to as a mobile station) used in a radio communication system. Reference numeral 2 denotes a base station that has a communication service area and establishes a wireless communication transmission path with the mobile station 1. Reference numeral 3 is a relay station that is arranged in the far end of the communication service area of the base station 2 or in a radio wave insensitive zone, and has a specific communication service area for the purpose of expanding the communication service area of the base station 2 or improving communication quality. It is. When performing wireless communication between the mobile station 1 and the base station 2, relay communication is performed via the relay station 3, thereby expanding the communication service area of the base station 2 and improving communication quality. Reference numeral 4 denotes a core network to which the base station 2 is connected. A plurality of base stations 2 are connected to the core network 4 but are not shown in FIG. In addition, a plurality of relay stations 3 may be installed for the relay station 3 in order to expand the communication service area of one base station 2, but is omitted in FIG.

  Next, the configuration of the mobile station 1 shown in FIG. 1 will be described. Reference numeral 11 denotes a radio unit that converts a radio signal received by an antenna for transmitting and receiving a radio signal into a baseband signal and converts a baseband signal to be transmitted into a radio signal. The code | symbol 12 is a transmission part which performs an encoding process and a modulation process with respect to transmission data, and produces | generates a baseband signal. Reference numeral 13 denotes a receiving unit that performs demodulation processing and decoding processing on the reception signal converted into the baseband signal by the wireless unit 11. Reference numeral 14 denotes a control unit that performs overall control of processing operations of the mobile station 1. Reference numeral 15 denotes an application unit that performs application processing such as voice call and packet communication service and user interface processing. Reference numeral 16 denotes an information collecting unit that collects information about signals transmitted and received in the wireless unit 11 in order to obtain an evaluation value of communication quality. Reference numeral 17 denotes a route selection unit that selects a transmission route between the mobile station 1 and the base station 2 based on the information collected by the information collection unit 16. Reference numeral 18 denotes a GPS (Global Positioning System) receiver that specifies the position of the mobile station 1 on the earth, and outputs latitude and longitude information.

  Next, the configuration of the base station 2 shown in FIG. 1 will be described. Reference numeral 21 denotes a radio unit that down-converts a radio signal transmitted / received to / from the mobile station 1 or the relay station 3 to a baseband or up-converts a baseband signal to a radio signal via an antenna. Reference numeral 22 denotes a transmission unit that generates and modulates data to be transmitted to the mobile device 1. Reference numeral 23 denotes a receiving unit that receives and demodulates data transmitted from the mobile device 1. Reference numeral 24 denotes a control unit that performs overall control of processing operations of the base station 2. Reference numeral 25 denotes a network communication unit that performs communication with the core network 4. Reference numeral 26 denotes an information collection unit that collects information related to transmitted and received signals in the wireless unit 21 in order to obtain an evaluation value of communication quality. Reference numeral 27 denotes a path selection unit that selects a transmission path between the mobile station 1 and the base station 2 based on the information collected by the information collection unit 26.

  Next, the configuration of the relay station 3 shown in FIG. 1 will be described. Reference numeral 31 denotes a radio unit that down-converts a radio signal transmitted / received to / from the mobile station 1 or the base station 2 to a baseband or up-converts a baseband signal to a radio signal via an antenna. The code | symbol 32 is a transmission part which produces | generates the data which should be transmitted in order to relay, and modulates. Reference numeral 33 denotes a receiving unit that demodulates data received for relaying. Reference numeral 34 denotes a control unit that performs overall control of processing operations of the relay station 3, and transmits data to be relayed received by the reception unit 33 via the transmission unit 32. Reference numeral 35 denotes a GPS receiver that identifies the position of the relay station 3 on the earth when the relay station 3 is movable, and outputs latitude and longitude information.

  Next, the wireless communication transmission paths of the mobile station 1, the base station 2, and the relay station 3 will be described. Here, the uplink and downlink wireless communication transmission paths between the mobile station 1 and the base station 2 are referred to as transmission paths 1. The uplink and downlink wireless communication transmission paths between the base station 2 and the relay station 3 are referred to as transmission paths 2. Also, the uplink and downlink wireless communication transmission paths between the mobile station 1 and the relay station 3 are referred to as transmission paths 3. A composite wireless communication transmission path capable of transmitting and receiving data between the mobile station 1 and the base station 2 using these three transmission paths is referred to as a transmission path. The transmission path includes a transmission path using only the transmission path 1 (referred to as transmission path 1) and a transmission path using the transmission paths 2 and 3 via the relay station 3 (referred to as transmission path 2). There is a transmission path that uses the transmission path 1 and the transmission paths 2 and 3 simultaneously in parallel (referred to as a transmission path 3).

  When the configurations of the mobile station 1, the base station 2, and the relay station 3 are described with reference to FIG. 1, the known functions and configurations that the mobile station 1, the base station 2, and the relay station 3 normally have are described in this document. Unless the description of the invention is directly related, the description and illustration of the configuration are omitted.

  Moreover, the route selection unit 17 provided in the mobile station 1 and the route selection unit 27 provided in the base station 2 only need to be provided. That is, when the mobile station 1 is provided with the route selection unit 17 and the route selection operation is performed on the mobile station 1 side, the route selection unit 27 of the base station 2 is not necessarily provided. Further, when the route selection unit 27 is provided in the base station 2 and the route selection operation is performed on the base station side 2 side, the route selection unit 17 of the mobile station 1 is not necessarily provided. In the following description, the route selection operation is described as being performed on the mobile station 1 side.

  Next, an operation in which the route selection unit 17 selects a transmission route based on the information collected by the information collection unit 16 illustrated in FIG. 1 will be described. Here, a description will be given on the assumption that uplink / downlink data communication is performed between the base station 2 and the mobile station 1, and a relay station 3 is installed for the purpose of relaying the data communication. When both the transmission path 1 and the transmission path 2 can be used when establishing a transmission path for uplink and downlink radio communication between the mobile station 1 and the base station 2, the calculation by the following formula should be performed. Select the transmission path to be used in.

The smaller the values of E _{path 1} (evaluation function value of transmission path 1) and E _{path 2} (evaluation function value of transmission path 2) calculated by the expressions (1) and (2), the better (good) the transmission path. Can be estimated. Therefore, the route selection unit 17 uses the equations (3) and (4) to select and determine the transmission route to be used, and if the equation (3) is satisfied, selects the transmission route 1 (4 When the expression (2) is satisfied, the transmission path 2 is selected.
E _{route 1} ≦ E _{route 2} (3)
E _{route 1} > E _{route 2} (4)

  As for the evaluation values of the downlink transmission paths 1, 2, and 3 in the expressions (1) and (2), the information collecting unit 16 collects each value related to the communication quality between the target mobile station 1 and the base station 2. Then, it is obtained from the collected values by the equations (5) to (7) or the equations (5 ′) to (7 ′).

In Expressions (5) to (7) or (5 ′) to (7 ′), the frequency bandwidth used when transmitting unit information from the base station 2 or the relay station 3 is used as the downlink use frequency band. Also, the downlink transmission times t ₁ ^DL , t ₂ ^DL , and t ₃ ^DL are calculated from the equation (8), where the unit information amount is V _bits .

In equation (8), the use frequency bands BW ₁ ^DL , BW ₂ ^DL , and BW ₃ ^DL are such that the longer the transmission path distance, the lower the communication capacity due to a decrease in the signal-to-noise ratio due to signal attenuation. In such a case, a large band is required to transmit a certain number of bits. Therefore, the use frequency band may be determined by measuring the propagation loss value (Path Loss) of the transmission line. The propagation loss fluctuation widths ΔPL ₁ ^DL , ΔPL ₂ ^DL , and ΔPL ₃ ^DL are calculated from the absolute difference between the maximum value and the minimum value of the propagation loss values (Path Loss) measured in the respective transmission lines in a specific measurement period.

  Since the propagation loss fluctuation range is proportional to the relative movement speed between the two stations, the value of the propagation loss width is set to the relative value between the two stations in the equations (5) to (7) and (5 ′) to (7 ′). It may be replaced with the value of the moving speed. The relative moving speed is measured by periodically measuring the positions of the mobile station 1 and the relay station 3 by the GPS 18 and 35 provided in each of the mobile station 1 and the relay station 3 capable of moving the installation position. The relative movement speed between the relay station 3, the mobile station 1, and the base station 2 whose position is known may be obtained based on the movement distances of

Since transmission power (average transmitted power) P ₁ ^DL , P ₂ ^DL , and P ₃ ^{DL when} performing wireless communication on a transmission path is preferably as low as possible from the viewpoint of interference with other cells and power consumption, Calculation is performed by averaging the transmission power values in a specific measurement period.

On the other hand, the evaluation values E ₁ ^UL , E ₂ ^UL , and E ₃ ^UL of the upstream transmission paths 1, 2, and 3 in the expressions (1) and (2) are similarly between the target mobile station 1 and the base station 2. The information collection unit 16 collects each value related to the communication quality of (1) and obtains it from the collected values by the equations (9) to (11) or (9 ′) to (11 ′).

  The weighting coefficients for the upstream transmission path and the downstream transmission path are set in advance in the path selection unit 17 as a constant, whereby each value is weighted as necessary when the transmission path is selected. In other words, a larger weighting factor is set for the evaluation element to be emphasized, and the ratio in the evaluation value is increased. A smaller weighting coefficient is set for the evaluation element that is not important, or ignored. If it is good, 0 is set.

Next, the operation of changing the route by periodically calculating the _route evaluation values E _{route 1} and E _{route 2 according} to the equations (1) and (2) from the time when the establishment of the call connection is completed will be described. The path selection unit 17 uses the equations (12) and (13) to determine whether to change the transmission route to be used. The path selection unit 17 changes to the transmission path 2 when the expression (12) is satisfied while the transmission path 1 is being used. Further, the route selection unit 17 changes to the transmission route 1 when the transmission route 2 is used and the expression (13) is satisfied.

E _{path 1} -K _TH1 > E _{path 2} (12)
E _{path 2} −K _TH2 > E _{path 1} (13)
K _TH1 , K _TH2 : Evaluation value difference at the time of route change

  The evaluation value difference at the time of changing the transmission path is determined in advance in the path selection unit 17. As a result, the transmission route will not be changed unless the evaluation value difference with the currently used transmission route exceeds a certain value, and radio resources consumed by changing the transmission route more frequently than necessary will be suppressed. Is possible. The transmission path is changed by a handover or a procedure for reestablishing the current call connection once disconnected.

  Next, the operation of the wireless communication system shown in FIG. 1 will be described with reference to FIG. Here, a description will be given assuming that the route selection operation is performed on the mobile station 1 side. First, the information collecting unit 16 collects information necessary for obtaining an evaluation value of communication quality (step S1). The information collected by the information collecting unit 16 includes the required frequency band (transmission time) including the retransmission when transmitting the used frequency band and the previous unit information for the downlink transmission line and the uplink transmission line of each of the transmission lines 1, 2, and 3. ), Propagation loss value measured on each transmission line in the previous measurement period, propagation loss fluctuation range measured on each transmission line in the previous measurement period, base station 2 and relay station in the averaging period until immediately before 3 is the average power transmitted from 3 (average transmission power). These pieces of information are necessary to calculate the formulas (5) to (7) or (5 ′) to (7 ′), the formulas (9) to (11), or the (9 ′) to (11 ′) formulas. Information. Further, if the mobile station 1 itself can collect these pieces of information, the mobile station 1 collects the information and stores it in the information collecting unit 16. In addition, information that cannot be collected by the mobile station 1 itself is notified from the base station 2 and the relay station 3 to the mobile station 1 in advance and stored in the information collection unit 16.

  Next, the route selection unit 17 calculates an evaluation value for each transmission route based on the information held in the information collection unit 16 and the equations (1) and (2) (step S2). Then, the route selection unit 17 specifies a communication route that can be communicated based on the calculated evaluation value (step S3). Here, there may be a plurality of transmission paths to be identified. The path selection unit 17 determines whether or not there are a plurality of communication paths that can be specified (step S4). If a plurality of transmission paths are specified, the evaluation value is the best (equation (1) or ( 2) The smaller value obtained from the equation) selects a transmission path (step S5). Then, the path selection unit 17 notifies the control unit 14 of information that can identify the selected transmission path. On the other hand, when there is only one transmission path that can be communicated, the path selection unit 17 notifies the control unit 14 of information that can identify the transmission path.

  Next, the control unit 14 establishes a transmission path based on the transmission path identification information notified from the path selection unit 17, and performs call connection (step S6). Even after the call connection is made, the information collecting unit 16 continues the operation of collecting information necessary for obtaining the communication quality evaluation value (step S7). Then, the route selection unit 17 continues the operation of calculating the evaluation value of each transmission route based on the information held in the information collection unit 16 and the equations (1) and (2) (step S8). It is determined whether there is a transmission path having a better evaluation value than the connected transmission path (step S9). As a result of this determination, if there is a transmission path whose evaluation value is better than that of the currently connected transmission path, the path selection unit 17 can identify to the control unit 14 the transmission path to be handed over. To be notified. Receiving this, the control part 14 performs a hand-over (step S10). On the other hand, when there is no transmission path whose evaluation value is better than the currently connected transmission path, the connected call connection is maintained. Then, the information collection unit 16, the route selection unit 17, and the control unit 14 repeat the processing operations in steps S7 to S10 until the call is disconnected.

  Next, an example of using the above-described evaluation value calculation in a simplified manner will be described. When the transmission path having the same bandwidth is used in the transmission path 1 used in the transmission path 1 and the transmission path 2 (transmission path 2 and transmission path 3), the expressions (14) and (15) are satisfied.

  In addition, since the unit information amount is transmitted with a constant bandwidth, the time required for the transmission is also the same, and therefore Expressions (16) and (17) are satisfied.

The weighting coefficient satisfies the conditions of the expressions (18) to (20) when the transmission paths 1, 2, and 3 are evaluated with the same weight.
K ₁₁ = K ₂₁ = K ₃₁ = K ₁ (18)
K ₁₂ = K ₂₂ = K ₃₂ = K ₂ (19)
K ₁₃ = K ₂₃ = K ₃₃ = K ₃ (20)

Furthermore, assuming that the usage mode is one in which the downlink path is mainly used and the uplink path is not frequently used, the uplink transmission path is not a big problem. Therefore, the coefficient relating to the uplink evaluation is expressed by the equations (21) to (23). Thus, all can be set to zero.
_{K 41 = K 42 = K 43} = K 44 = 0 ··· (21)
K ₅₁ = K ₅₂ = K ₅₃ = K ₅₄ = 0 (22)
K ₆₁ = K ₆₂ = K ₆₃ = K ₆₄ = 0 (23)

  When this condition is added to the expressions (5) to (7) and (9) to (11) and the result is applied to the expressions (1) and (2), the evaluation functions of the transmission path 1 and the transmission path 2 A value can be calculated | required by (24), (25) Formula or (24 '), (25') Formula.

  In order to compare the transmission path 1 and the transmission path 2 when establishing a call connection, the difference between the evaluation values obtained by the equations (24) and (25) is obtained, and the transmission route is determined based on the result. It becomes possible to select. Therefore, the route selection unit 17 uses the equations (26) and (27) to determine the transmission route to be used, and if the equation (26) is satisfied, selects the transmission route 1 (27 When the expression (2) is satisfied, the transmission path 2 is selected.

E _{path 2} −E _{path 1} ≧ 0 (26)
E _{path 2} -E _{path 1} <0 (27)

The value of E _path 2 -E _{path 1} required for determination can be determined by (28) or (28 ') below.

  As described above, since the transmission path can be selected by a simple arithmetic processing by using the simple calculated value shown in the formula (28) or (28 ′), the path selection unit 17 can promptly select the path. It can be performed.

  When a transmission path is selected when starting a call connection, the bandwidth, transmission time, and average transmission power are defined in advance in the base station 2, and the propagation loss value width immediately before the start of the call connection is determined by the mobile station 2 and the relay. By measuring at the station 3 and transmitting these values to the base station 2, the base station 2 can perform route selection.

  Next, an operation for changing the route by periodically calculating the evaluation value of the route according to the equations (24) and (25) from the time when the establishment of the call connection is completed will be described. Similarly to the operation described above, the path selection unit 17 uses the above formulas (12) and (13) to determine whether to change the transmission path to be used. The path selection unit 17 changes to the transmission path 2 when the expression (12) is satisfied while the transmission path 1 is being used. Further, the route selection unit 17 changes to the transmission route 1 when the transmission route 2 is used and the expression (13) is satisfied.

  The evaluation value difference at the time of route change is determined in advance, so that the transmission route will not be changed unless the evaluation value difference with the currently used transmission route exceeds a certain value, and the transmission route changes more frequently than necessary. It is possible to suppress the radio resources consumed by performing. The transmission path is changed by a handover or a procedure for reestablishing the current call connection once disconnected.

  Next, in the configuration of the wireless communication system shown in FIG. 1, when the transmission path 3 using the transmission path 1 and the transmission path 3 using the transmission path 2 and the transmission path 2 using the transmission path 3 at the same time are used. The route selection operation will be described. As a communication method using the transmission route 3 using the transmission route 1 and the transmission route 2 at the same time, a method proposed in 3GPP TSG-RAN1 # 53bis R-082517 'Transparent Relay for LTE-Advanced FDD' is known. ing. When establishing uplink and downlink radio communication between the mobile station 1 and the base station 2, if any of the transmission paths 1, 2, and 3 can be used, the above equations (1) and (2) In addition, the transmission path to be used is determined using the evaluation value obtained by equation (31).

When establishing a call connection, E _{route 1} , E _{route 2} , and E _{route 3} are calculated immediately before based on the communication status and measured values in the respective transmission routes, and the smallest value and the preferred value are calculated. Select a transmission path. From the time when the establishment of the call connection is completed, the evaluation values of the transmission paths 1, 2, and 3 according to the expressions (1), (2), and (31) are periodically calculated, and the expressions (32) to (37) ) To determine the change of the transmission path.

When E _{route 2} ≦ E _{route 3} is satisfied while transmission route 1 is selected, when equation (32) is satisfied, the transmission route 2 is changed.
E _{path 1} + K _TH1 > E _{path 3} (32)
If E _{path 2} > E _{path 3} is satisfied while transmission path 1 is selected, if expression (33) is satisfied, the transmission path 3 is changed.
E _{path 1} + K _TH2 > E _{path 3} (33)
When E _{route 1} ≤ E _{route 3} is satisfied while transmission route 2 is selected, if equation (34) is satisfied, the transmission route 1 is changed.
E _route 2 _{+ K TH3>} E _route 1 (34)
If E _{path 1} > E _{path 3} is satisfied while transmission path 2 is selected, if expression (35) is satisfied, the transmission path 3 is changed.
E _{path 2} + K _TH4 > E _{path 3} (35)
When the transmission path 3 is selected, if E _{path 1} ≦ E _{path 2} is satisfied, if the expression (36) is satisfied, the transmission path 1 is changed.
E _{path 2} + K _TH5 > E _{path 1} (36)
If E _{path 1} > E _{path 2} is satisfied while transmission path 3 is selected, if expression (37) is satisfied, the transmission path 2 is changed.
E _{path 2} + K _TH6 > E _{path 3} (37)
In Expressions (32) to (37), K _{TH1 to} K _TH6 are evaluation value differences at the time of route change.

  The evaluation value difference at the time of changing the transmission path is determined in advance in the path selection unit 17. As a result, the transmission route will not be changed unless the evaluation value difference with the currently used transmission route exceeds a certain value, and radio resources consumed by changing the transmission route more frequently than necessary will be suppressed. Is possible. The transmission path is changed by a handover or a procedure for reestablishing the current call connection once disconnected.

  In the above description, the route selection operation is described as being performed by the route selection unit 17 of the mobile station 1, but the same processing operation may be performed by the route selection unit 27 of the base station 2. In this case, the base station 2 notifies the mobile station 1 of information for identifying the transmission path selected by the path selection unit 27, and the mobile station 1 uses the information for identifying the transmitted transmission path. The route may be specified and the mobile station 1 may perform call connection or handover.

  The transmission path may be selected by using the same transmission path as the transmission path selected based on one of the downlink and uplink evaluation values in the other (uplink or downlink) transmission path. In this way, the route selection determination process can be simplified. For example, when the transmission path 1 is selected based on the downlink evaluation value, the process for obtaining the uplink evaluation value is omitted by selecting the transmission path 1 for the uplink without obtaining the uplink evaluation value. be able to.

  Also, different transmission paths may be selected for uplink and downlink based on the respective evaluation values for uplink and downlink. For example, by selecting transmission path 1 for uplink and selecting transmission path 2 for downlink, it is possible to select an optimal transmission path at the present time.

  In addition, based on the content of the communication channel start instruction received from the base station 2, the mobile station 1 is currently using a transmission path (transmission path 1) for direct communication with the base station 2. The user of the mobile station 1 identifies whether it is a transmission path (transmission path 2) via the relay station 3 or a transmission path (transmission path 3) that uses two transmission paths simultaneously. The transmission path identification information may be displayed on a display unit (not shown) of the mobile station 1 so as to be possible. As a result, the user can recognize the transmission path currently in use. In addition, when there is only one transmission path that can be used among the transmission paths 1, 2, and 3, there is no room for selection, so if a usable path is selected without obtaining an evaluation value for each transmission path. Good.

  As described above, the communication quality evaluation values of the transmission paths 1, 2, and 3 are the radio resources required when transmitting the unit information amount from the base station 2 to the mobile station 1, and the interference power given to other cells The amount, transmission time, or relative movement speed of each other, and all these combinations were calculated by multiplying each weighting factor, and the most suitable value was calculated for each transmission path. Since the wireless call connection is established by selecting the transmission route, when communication is performed between the base station 2 and the mobile station 1, the route using the relay function by the relay station 3 and the direct movement with the base station 2 It is possible to suitably perform route selection when both of the transmission paths by the wireless transmission path between the stations 1 are possible. Also, after the call connection is completed, an evaluation value is calculated periodically, and if a transmission path with a more preferable value than the currently used transmission path appears, a handover is made to the preferable transmission path. Therefore, it is possible to always perform communication using a suitable transmission path.

  In the case of the conventional mobile phone communication system, only connection through the transmission path 1 shown in FIG. 1 is considered, and there is no concept of configuring an optimal transmission path using the relay station 3. Also, in recent years, the concept of using a relay station has been introduced, but when selecting from a plurality of transmission paths, it relies on cell selection of a conventional communication method, and determination based on received power measurement at a mobile station. Therefore, the optimum transmission path is not always selected. In the present invention, an evaluation function of a transmission path used in each transmission path for path selection determination is configured, and an evaluation value of each transmission path is calculated by this evaluation function at the time of call connection start and call connection continuation. It is possible to select an optimal transmission path. As an evaluation function, the amount of radio resources, transmission power, transmission time, and relative movement speed between the base station, relay station, and mobile station that are required when transmitting the unit information amount are evaluated. A preferred transmission path can be selected.

  Note that a program for realizing the functions of the information collection units 16 and 26 and the path selection units 17 and 27 shown in FIG. 1 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is stored in a computer system. The transmission path selection process may be performed by reading the data into and executing it. The “computer system” here includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, what is called a difference file (difference program) may be sufficient.

  DESCRIPTION OF SYMBOLS 1 ... Mobile communication terminal (mobile station), 11 ... Radio | wireless part, 12 ... Transmission part, 13 ... Reception part, 14 ... Control part, 15 ... Application part, 16 ... Information collection unit, 17 ... route selection unit, 18 ... GPS, 2 ... base station (base station device), 21 ... radio unit, 22 ... transmission unit, 23 ... reception , 24 ... control unit, 25 ... network communication unit, 26 ... information collection unit, 27 ... route selection unit, 3 ... relay station (relay station device), 31 ... wireless Unit 32... Transmission unit 33 33 reception unit 34 control unit 35 GPS unit 4 core network

Claims (18)

A first transmission path between the base station apparatus and the mobile communication terminal, comprising: a base station apparatus; a mobile communication terminal; and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal. A first transmission path that performs data transmission using the second transmission path, a second transmission path between the base station apparatus and the relay station apparatus, and a third transmission path between the relay station apparatus and the mobile communication terminal. In the wireless communication system in which a plurality of paths can be used among the second transmission paths for performing data transmission
The mobile communication terminal is
Information collecting means for collecting information necessary for obtaining an evaluation value of communication quality of each of the first and second transmission paths;
When establishing a wireless connection with the base station apparatus, using the information necessary for obtaining the evaluation value of the communication quality, obtain the evaluation value of the first and second transmission paths, respectively, a good evaluation value A wireless communication system comprising: route selection means for selecting a transmission route obtained as a transmission route to be used. A first transmission path between the base station apparatus and the mobile communication terminal, comprising: a base station apparatus; a mobile communication terminal; and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal. A first transmission path that performs data transmission using the second transmission path, a second transmission path between the base station apparatus and the relay station apparatus, and a third transmission path between the relay station apparatus and the mobile communication terminal. A plurality of paths are used among the second transmission path for performing data transmission and the third transmission path for performing data transmission using the first transmission path and the second transmission path simultaneously. In a wireless communication system that is possible,
The mobile communication terminal is
Information collecting means for collecting information necessary for obtaining an evaluation value of communication quality of each of the first, second and third transmission paths;
When establishing a wireless connection with the base station device, using the information necessary to determine the evaluation value of the communication quality, obtain the evaluation value of the first, second and third transmission path, respectively, A wireless communication system comprising: a route selection unit that selects a transmission route for which a good evaluation value is obtained as a transmission route to be used. The route selection means includes
During the establishment of the wireless connection, the evaluation value is calculated, a transmission path that has obtained an evaluation value better than the evaluation value of the transmission path being connected is selected as a transmission path to be used, and a transmission path to be used is selected. The wireless communication system according to claim 1, wherein the wireless communication system is changed. A first transmission path between the base station apparatus and the mobile communication terminal, comprising: a base station apparatus; a mobile communication terminal; and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal. A first transmission path that performs data transmission using the second transmission path, a second transmission path between the base station apparatus and the relay station apparatus, and a third transmission path between the relay station apparatus and the mobile communication terminal. In the wireless communication system in which a plurality of paths can be used among the second transmission paths for performing data transmission
The base station device
Information collecting means for collecting information necessary for obtaining an evaluation value of communication quality of each of the first and second transmission paths;
When establishing a wireless connection with the mobile communication terminal, the information necessary for obtaining the evaluation value of the communication quality is used to obtain the evaluation values of the first and second transmission paths, respectively. A wireless communication system comprising: route selection means for selecting a transmission route obtained as a transmission route to be used. A first transmission path between the base station apparatus and the mobile communication terminal, comprising: a base station apparatus; a mobile communication terminal; and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal. A first transmission path that performs data transmission using the second transmission path, a second transmission path between the base station apparatus and the relay station apparatus, and a third transmission path between the relay station apparatus and the mobile communication terminal. A plurality of paths are used among the second transmission path for performing data transmission and the third transmission path for performing data transmission using the first transmission path and the second transmission path simultaneously. In a wireless communication system that is possible,
The base station device
Information collecting means for collecting information necessary for obtaining an evaluation value of communication quality of each of the first, second and third transmission paths;
When establishing a wireless connection with the mobile communication terminal, using information necessary for obtaining the evaluation value of the communication quality, obtain the evaluation value of the first, second and third transmission path, respectively, A wireless communication system comprising: a route selection unit that selects a transmission route for which a good evaluation value is obtained as a transmission route to be used. The route selection means includes
During the establishment of the wireless connection, the evaluation value is calculated, a transmission path that has obtained an evaluation value better than the evaluation value of the transmission path being connected is selected as a transmission path to be used, and a transmission path to be used is selected. The wireless communication system according to claim 4, wherein the wireless communication system is changed.   The information necessary for obtaining the evaluation value of the communication quality is at least one of a use frequency band, a transmission time, a propagation loss value, a propagation loss fluctuation value width, a relative movement speed, and a transmission power value. Item 7. The wireless communication system according to any one of Items 1 to 6. The route selection means includes
2. The transmission path selected by obtaining the evaluation value of one or both of an uplink transmission path and a downlink transmission path is selected as an uplink and downlink transmission path to be used. The wireless communication system according to any one of 1 to 7. The route selection means includes
8. The evaluation value for each of an upstream transmission path and a downstream transmission path is obtained, and a transmission path having a good evaluation value for each of upstream and downstream is selected as a transmission path to be used. A wireless communication system according to any one of the above.   The wireless communication terminal according to any one of claims 1 to 9, wherein the mobile communication terminal further includes display means for displaying information capable of identifying a transmission path used during establishment of a wireless connection. Communications system. A first transmission path between the base station apparatus and the mobile communication terminal, comprising: a base station apparatus; a mobile communication terminal; and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal. A first transmission path that performs data transmission using the second transmission path, a second transmission path between the base station apparatus and the relay station apparatus, and a third transmission path between the relay station apparatus and the mobile communication terminal. A wireless communication path selection method in a wireless communication system in which a plurality of paths can be used among the second transmission paths for performing data transmission,
The mobile communication terminal is
An information collecting step for collecting information necessary for obtaining an evaluation value of communication quality of each of the first and second transmission paths;
When establishing a wireless connection with the base station apparatus, using the information necessary for obtaining the evaluation value of the communication quality, obtain the evaluation value of the first and second transmission paths, respectively, a good evaluation value And a route selection step of selecting the obtained transmission route as a transmission route to be used. A first transmission path between the base station apparatus and the mobile communication terminal, comprising: a base station apparatus; a mobile communication terminal; and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal. A first transmission path that performs data transmission using the second transmission path, a second transmission path between the base station apparatus and the relay station apparatus, and a third transmission path between the relay station apparatus and the mobile communication terminal. A plurality of paths are used among the second transmission path for performing data transmission and the third transmission path for performing data transmission using the first transmission path and the second transmission path simultaneously. A wireless communication path selection method in a wireless communication system that is possible,
The mobile communication terminal is
An information collecting step for collecting information necessary for obtaining an evaluation value of communication quality of each of the first, second and third transmission paths;
When establishing a wireless connection with the base station device, using the information necessary to determine the evaluation value of the communication quality, obtain the evaluation value of the first, second and third transmission path, respectively, And a route selection step of selecting a transmission route with a good evaluation value as a transmission route to be used. A first transmission path between the base station apparatus and the mobile communication terminal, comprising: a base station apparatus; a mobile communication terminal; and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal. A first transmission path that performs data transmission using the second transmission path, a second transmission path between the base station apparatus and the relay station apparatus, and a third transmission path between the relay station apparatus and the mobile communication terminal. A wireless communication path selection method in a wireless communication system in which a plurality of paths can be used among the second transmission paths for performing data transmission,
The base station device is
An information collecting step for collecting information necessary for obtaining an evaluation value of communication quality of each of the first and second transmission paths;
When establishing a wireless connection with the mobile communication terminal, the information necessary for obtaining the evaluation value of the communication quality is used to obtain the evaluation values of the first and second transmission paths, respectively. And a route selection step of selecting the obtained transmission route as a transmission route to be used. A first transmission path between the base station apparatus and the mobile communication terminal, comprising: a base station apparatus; a mobile communication terminal; and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal. A first transmission path that performs data transmission using the second transmission path, a second transmission path between the base station apparatus and the relay station apparatus, and a third transmission path between the relay station apparatus and the mobile communication terminal. A plurality of paths are used among the second transmission path for performing data transmission and the third transmission path for performing data transmission using the first transmission path and the second transmission path simultaneously. A wireless communication path selection method in a wireless communication system that is possible,
The base station device is
An information collecting step for collecting information necessary for obtaining an evaluation value of communication quality of each of the first, second and third transmission paths;
When establishing a wireless connection with the mobile communication terminal, using information necessary for obtaining the evaluation value of the communication quality, obtain the evaluation value of the first, second and third transmission path, respectively, And a route selection step of selecting a transmission route with a good evaluation value as a transmission route to be used. A first transmission path between the base station apparatus and the mobile communication terminal, comprising: a base station apparatus; a mobile communication terminal; and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal. A first transmission path that performs data transmission using the second transmission path, a second transmission path between the base station apparatus and the relay station apparatus, and a third transmission path between the relay station apparatus and the mobile communication terminal. A wireless communication path selection program that operates on a wireless communication system in which a plurality of paths can be used among the second transmission paths that perform data transmission,
A computer in the mobile communication terminal;
An information collecting step for collecting information necessary for obtaining an evaluation value of communication quality of each of the first and second transmission paths;
When establishing a wireless connection with the base station apparatus, using the information necessary for obtaining the evaluation value of the communication quality, obtain the evaluation value of the first and second transmission paths, respectively, a good evaluation value And a route selection step for selecting the transmission route obtained as a transmission route to be used. A first transmission path between the base station apparatus and the mobile communication terminal, comprising: a base station apparatus; a mobile communication terminal; and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal. A first transmission path that performs data transmission using the second transmission path, a second transmission path between the base station apparatus and the relay station apparatus, and a third transmission path between the relay station apparatus and the mobile communication terminal. A plurality of paths are used among the second transmission path for performing data transmission and the third transmission path for performing data transmission using the first transmission path and the second transmission path simultaneously. A wireless communication path selection program that operates on a wireless communication system that is possible,
A computer in the mobile communication terminal;
An information collecting step for collecting information necessary for obtaining an evaluation value of communication quality of each of the first, second and third transmission paths;
When establishing a wireless connection with the base station device, using the information necessary to determine the evaluation value of the communication quality, obtain the evaluation value of the first, second and third transmission path, respectively, And a route selection step of selecting a transmission route having a good evaluation value as a transmission route to be used. A first transmission path between the base station apparatus and the mobile communication terminal, comprising: a base station apparatus; a mobile communication terminal; and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal. A first transmission path that performs data transmission using the second transmission path, a second transmission path between the base station apparatus and the relay station apparatus, and a third transmission path between the relay station apparatus and the mobile communication terminal. A wireless communication path selection program that operates on a wireless communication system in which a plurality of paths can be used among the second transmission paths that perform data transmission,
In the computer in the base station device,
An information collecting step for collecting information necessary for obtaining an evaluation value of communication quality of each of the first and second transmission paths;
When establishing a wireless connection with the mobile communication terminal, the information necessary for obtaining the evaluation value of the communication quality is used to obtain the evaluation values of the first and second transmission paths, respectively. And a route selection step for selecting the transmission route obtained as a transmission route to be used. A first transmission path between the base station apparatus and the mobile communication terminal, comprising: a base station apparatus; a mobile communication terminal; and a relay station apparatus that relays data transmission between the base station apparatus and the mobile communication terminal. A first transmission path that performs data transmission using the second transmission path, a second transmission path between the base station apparatus and the relay station apparatus, and a third transmission path between the relay station apparatus and the mobile communication terminal. A plurality of paths are used among the second transmission path for performing data transmission and the third transmission path for performing data transmission using the first transmission path and the second transmission path simultaneously. A wireless communication path selection program that operates on a wireless communication system that is possible,
In the computer in the base station device,
An information collecting step for collecting information necessary for obtaining an evaluation value of communication quality of each of the first, second and third transmission paths;
When establishing a wireless connection with the mobile communication terminal, using information necessary for obtaining the evaluation value of the communication quality, obtain the evaluation value of the first, second and third transmission path, respectively, And a route selection step of selecting a transmission route having a good evaluation value as a transmission route to be used.

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