JP2011166554A - Wireless communication system, and base station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication system, capable of recognizing where a mobile terminal is located in a communication area of a base station. <P>SOLUTION: The wireless communication system includes a base station 1 and a mobile terminal 2 which performs wireless communication with the base station 1. The base station 1 has a plurality of separated communication areas 3a, 4a, 5a and the mobile terminal 2 communicates with the base station 1 while allowing the base station 1 to identify the communication area wherein the communication is performed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a radio communication system and a base station that perform location management of mobile terminals.

  Patent Document 1 describes a mobile communication system capable of managing the location of a mobile terminal. In the mobile communication system described in Patent Document 1, a base station is provided in each area, and the position of the mobile terminal is recognized depending on in which base station the mobile terminal exists.

JP 2002-95035 A

  However, in the mobile communication system described in Patent Document 1, even if it is known in which base station area the mobile terminal exists, it is possible to grasp more detailed position information about where in the base station area. Impossible. For example, it is impossible to specify in which room the mobile terminal is present in each home.

  Therefore, in view of the above-described problems, an object of the present invention is to provide a radio communication system and a base station that make it possible to grasp where a mobile terminal is located in a communication area of the base station.

  The wireless communication system of the present invention includes a base station and a mobile terminal that performs wireless communication with the base station, the base station has a plurality of separated communication areas, and the mobile terminal performs communication in any communication area. This is characterized in that the base station can be identified and the base station communicates.

  The wireless communication system of the present invention includes a base station and a mobile terminal that performs wireless communication with the base station, the base station has a plurality of separated communication areas, and the mobile terminal performs communication in any communication area. This is characterized in that the base station can be identified and the base station communicates. Thereby, it is possible to grasp where the mobile terminal is located in the communication area of the base station.

1 is a configuration diagram of a radio communication system according to a first embodiment. 3 is a configuration diagram of a radio communication system according to a second embodiment. FIG. It is a figure which shows the structure of the time slot by a TDMA system. 6 is a diagram for explaining an operation of the wireless communication system according to the first embodiment. FIG. 3 is a configuration diagram of a base station apparatus according to Embodiment 1. FIG. 3 is a configuration diagram of a base station apparatus according to Embodiment 1. FIG. FIG. 10 is a diagram for explaining the operation of the wireless communication system according to the third embodiment.

(Embodiment 1)
<Configuration>
A radio communication system according to the present embodiment will be described with reference to FIG. The wireless communication system according to the present embodiment includes a base station 1 that is a wireless base station installed in a private house, a mobile terminal 2 that performs wireless communication with the base station 1 in the private house, and a base station that is installed in each room. 1 and transmitters / receivers 3 to 5 that relay the mobile terminal 2.

  The transceivers 3 to 5 perform wireless communication with the base station 1 through different wireless channels, and are installed so that the transmission / reception ranges with the mobile terminal 2 do not overlap each other. For example, the left figure of FIG. 1 shows an installation example, the transmission / reception range 3a of the transceiver 3 installed in the living room, the transmission / reception range 4a of the transceiver 4 installed in the bedroom, and the transceiver installed in the toilet. The transmission / reception ranges 5a of 5 do not overlap each other.

<Operation>
The base station 1 requests the mobile terminal 2 or the transceivers 3 to 5 using downlink data to use different frequencies for each room. When making such a request to the mobile terminal 2, the transceivers 3 to 5 are not essential components of the wireless communication system, and the mobile terminal 2 may directly perform wireless communication with the base station 1. Good.

  As a method of dividing the request for each room, beam control may be performed for downlink transmission from the base station 1, or an amplifier that amplifies only a specific request may be installed in each room. For example, in a bedroom, a repeater that amplifies only the frequency for the bedroom may be installed.

  On the other hand, if the specific frequency is strong in the downlink signal from the base station 1, the mobile terminal 2 or the transmitters / receivers 3 to 5 perform association so as to transmit the uplink signal at a predetermined frequency.

  When the mobile terminal 2 performs communication in the bedroom, the mobile terminal 2 transmits data to the transceiver 4 having the bedroom as the communication area, and the transceiver 4 transmits data to the base station 1 at a frequency corresponding to the bedroom. Alternatively, in the case of a wireless communication system that does not include the transceivers 3 to 5, the mobile terminal 2 transmits data directly to the base station 1 at a frequency corresponding to the bedroom.

  The base station 1 obtains a correlation value using a known symbol corresponding to the frequency of the bedroom and determines that communication has been made in the bedroom when it has a certain size (FIG. 4). In this way, the base station 1 can grasp that the mobile terminal 2 is in the bedroom.

  As described above, the radio communication system according to the present embodiment includes the base station 1 and the mobile terminal 2 that performs radio communication with the base station 1, and the base station 1 has a plurality of separated communication areas. 2 communicates with the base station 1 by allowing the base station 1 to identify in which communication area the communication is. If the communication area is divided corresponding to each room in the house, it is possible to grasp in which room the mobile terminal 2 is located from a remote host device.

  Or the radio | wireless communications system of this Embodiment is provided with the base station 1, the some transmission / reception apparatuses 3-5, and the mobile terminal 2 which performs radio | wireless communication with the base station 1 via the transmission / reception apparatuses 3-5, and several In the transmission / reception apparatuses 3 to 5, communication areas with the mobile terminals 2 separated from each other are set, and the mobile terminal 2 enables the base station 1 to identify the communication area in which the communication is performed. Communicate with 1. By dividing the communication area in the house by the transmission / reception devices 3 to 5, it is possible to grasp where the mobile terminal 2 is located in the house from the remote host device.

  In the above description, the transmitters / receivers 3 to 5 are distinguished according to the channel, but in the case of W-CDMA communication, they may be distinguished by using different specific spreading codes. For example, different specific time slots may be assigned to each room (FIG. 3). Thus, by using different radio resources for each communication area, it is possible to grasp in which communication area the mobile terminal 2 is located.

  In addition, the transceivers 3 to 5 do not always perform wireless communication with each assigned channel, spreading code, or time slot, but perform the above operation only at a specific time in response to an instruction from the host device. Also good. At other times, the transceivers 3 to 5 perform wireless communication using all channels, thereby improving channel utilization efficiency. The same idea applies to the operation of the base station 1 when the transceivers 3 to 5 are not used.

  The internal configuration of the base station in the first embodiment is shown in FIGS. FIG. 5 shows the base station apparatus 1a in the case where the roles of the transceivers of the bedroom, the living room, the bath / toilet, and the respective transceivers are performed together with one transceiver 11. In the figure, the frequency-dependent transceiver 11 is included in the base station apparatus 1a, but the frequency-specific transceiver 11 may be regarded as an external configuration of the base station apparatus 1a. The frequency-specific transceiver 11 equipped with LNA or the like receives signals from the mobile terminal 2 via the antenna 10, but can receive signals at a plurality of frequencies.

  The base station apparatus 1a compares a correlation value with a threshold value using a known symbol correlation calculation unit 12 that calculates a correlation value using a known symbol of the received signal received by the frequency-specific transceiver 11, and determines the location of the mobile terminal 2. A threshold comparison location determination unit 13 for determination.

  The mobile terminal 2 performs an operation of transmitting a signal including a known symbol to the base station apparatus 1 at a frequency indicated by the base station apparatus 1a. The base station apparatus 1 uses the frequency f1 in the uplink signal from the mobile terminal 2 to the base station apparatus 1a in the downlink signal to the mobile terminal 2 in the bedroom direction. The information is included to use the frequency f3 for the bus / toilet direction so that the frequency f2 is used.

  The uplink signal from the mobile terminal 2 is received by the antenna 10, and the received data at each frequency f <b> 1 to f <b> 3 is received by the frequency-specific transceiver 11. The known symbol correlation calculation unit 12 calculates a correlation value using known symbols known by both the mobile terminal 2 and the base station apparatus 1a, and the threshold comparison location determination unit 13 calculates the correlation value at each frequency as a threshold value. In addition, based on the result exceeding the threshold, the moving local location is determined and used as location information.

  For example, if both f1 and f2 exceed the threshold value, but the correlation value of f1 is twice as large as the correlation value of f2, it is determined that the mobile terminal 2 is located near the living room in the bedroom. If none of f1 to f3 exceeds the threshold, the mobile terminal 2 determines whether the power is turned off or not located in the house. In order to further improve the location accuracy, information on a delay profile using correlation calculation can also be used. Specifically, in the case of the W-CDMA system, the location accuracy can be further increased by using the propagation delay (3GPP TS25.435) obtained based on the correlation value of the PRACH preamble. Interpolation of chip unit data is performed to improve sampling accuracy, a delay profile is obtained in the state of chip oversampling, the maximum (peak) position of the correlation value is converted into a distance from the antenna end, and the information is used for location determination.

  By adopting such a configuration, it is possible to realize the base station apparatus 1a capable of specifying the location information when the transmitter / receiver is installed in a single state.

  FIG. 6 shows the internal configuration of the base station apparatus 1b that identifies the location of the mobile terminal 2 when the transceivers 3 to 5 are separated in the bedroom, living room, and bath / toilet as shown in FIG. It is shown. The transceiver 4 (equipped with an LNA or the like) adjusted so that the bedroom is in the area range receives a signal from the mobile terminal 2 located in the bedroom via the antenna 15. The transceiver 3 (equipped with LNA or the like) adjusted so that the living room is in the area range receives a signal from the mobile terminal 2 located in the living room via the antenna 16. The transceiver 5 (equipped with LNA or the like) adjusted so that the bath / toilet is in the area range receives a signal from the mobile terminal 2 located in the bedroom via the antenna 17.

  The base station apparatus 1b receives the received signals of the transceivers 3 to 5, and compares the magnitudes of the correlation values with the known symbol correlation calculation units 18 to 20 that calculate the correlation values from the known symbols, and determines the maximum value. And a threshold comparison location determination unit 22 that compares the maximum correlation value with a threshold and determines the location of the mobile terminal 2.

  For example, if the mobile terminal 2 is located near a bedroom in the living room, the signal of the mobile terminal 2 is received by the antennas 15 and 16. The signal received by the antenna 15 is received (amplified by an amplifier or the like) by the bedroom area compatible transceiver 4. The known symbol correlation calculation unit 18 calculates the correlation value of the known symbol portion. The signal received by the antenna 16 is received by the living area compatible transceiver 3 (amplified by an amplifier or the like), and the known symbol correlation calculation unit 19 calculates the correlation value of the known symbol portion. Since the mobile terminal 2 is far from the bus / toilet, the correlation value calculated by the known symbol correlation calculation unit 20 is close to zero. The order of magnitude of these correlation values is determined by the maximum value determination unit 21. The maximum value is the correlation value of the signal from the living room, and the next largest value is the correlation value of the signal from the bedroom. These three correlation values are passed to the threshold comparison location determination unit 22 together with information in order of size. The threshold comparison location determination unit 22 compares the maximum correlation value, the next largest correlation value, and the minimum correlation value with threshold values. If the correlation value from the living room and the correlation value from the bedroom exceed the threshold value and the correlation value from the bath / toilet does not exceed the threshold value, the mobile terminal 2 is located in the living room near the bedroom and far from the bath / toilet. It is determined that they are doing. The determination result is notified as a digitized location information to a higher-level device. If none of the correlation values exceeds the threshold value, it is determined whether the mobile terminal 2 is turned off or is not located in the house. In order to further improve the location accuracy, information on a delay profile using correlation calculation can also be used. Specifically, in the case of the W-CDMA system, the location accuracy can be further increased by using the propagation delay (3GPP TS25.435) obtained based on the correlation value of the PRACH preamble. Interpolation of data in units of chips, increasing sampling accuracy, obtaining a delay profile in the state of chip oversampling, converting the maximum (peak) position of the correlation value into a distance from the antenna end, and using the information for location determination.

  By adopting such a configuration, it is possible to realize a base station and a base station host device that can specify location information when the transceiver is installed in each room.

<Effect>
According to the radio communication system of the present embodiment, the following effects can be obtained as described above. That is, the radio communication system of the present embodiment includes a base station 1 and a mobile terminal 2 that performs radio communication with the base station 1, and the base station 1 has a plurality of separated communication areas. The base station 1 can identify which communication area the communication is in, and communicate with the base station 1. If the communication area is divided corresponding to each room in the house, it is possible to grasp in which room the mobile terminal 2 is located from a remote host device.

  Or the radio | wireless communications system of this Embodiment is provided with the base station 1, the some transmission / reception apparatuses 3-5, and the mobile terminal 2 which performs radio | wireless communication with the base station 1 via the transmission / reception apparatuses 3-5, and several In the transmission / reception apparatuses 3 to 5, communication areas with the mobile terminals 2 separated from each other are set, and the mobile terminal 2 enables the base station 1 to identify the communication area in which the communication is performed. Communicate with 1. By dividing the communication area in the house by the transmission / reception devices 3 to 5, it is possible to grasp where the mobile terminal 2 is located in the house from the remote host device.

  The base station 1 identifies which communication area the communication is using by using different radio resources for each communication area. With such a configuration, it is possible to grasp where the mobile terminal 2 is located in the house from a remote host device.

  The radio resource is a channel, spreading code, or time slot that is different for each communication area. In a wireless communication system using FDMA, CDMA, or TDMA, it is possible to grasp where the mobile terminal 2 is located in the house.

  Furthermore, the base station 1 identifies the communication area only for a predetermined time. Thereby, utilization efficiency improves.

  According to the base station 1 of this Embodiment, there exist the following effects. That is, the base station 1 according to the present embodiment is a base station that performs radio communication with the mobile terminal 2 and has a plurality of separated communication areas, and uses any radio resource for each communication area, so that any communication can be performed. Identify whether communication is in the area. With such a configuration, it is possible to grasp where the mobile terminal 2 is located in the house.

(Embodiment 2)
A radio communication system according to the second embodiment will be described with reference to FIG. The wireless communication system according to the second embodiment includes a base station 1 that is a wireless base station installed in a private house and a mobile terminal 2 that performs wireless communication with the base station 1 in the private house. In Embodiment 1, the communication area is divided into a plurality of parts by using different channels, spreading codes, or time slots. However, in the wireless communication system of Embodiment 2, the transmission power of base station 1 is increased or decreased. The communication area is adjusted by and the position of the mobile terminal 2 is specified.

  In the case of transmission power A, the base station 1 can transmit and receive with the mobile terminal 2 in the range of 100% of the house (7 in the figure), and in the case of transmission power B, the range of 50% of the house (8 in the figure). In the case of transmission power C, power design is performed so that transmission / reception with the mobile terminal 2 can be performed within the range of 25% of the house (9 in the figure). To adjust the communication area. The host device grasps where the mobile terminal 2 is in the house by checking whether the transmission power A, B, or C of the base station 1 can be wirelessly communicated with the mobile terminal 2. I can do it.

  Note that the base station 1 may adjust the communication area by increasing or decreasing the transmission power only when instructed by the host device. The use efficiency is improved by always setting the entire house as the communication area with the transmission power A at other times.

<Effect>
The radio communication system according to Embodiment 2 has the following effects. That is, the wireless communication system according to the second embodiment includes a base station 1 and a mobile terminal 2 that performs wireless communication with the base station 1, and the base station 1 adjusts a communication area by changing transmission power, and moves The position of the mobile terminal 2 is grasped from the transmission power of the base station 1 when the terminal 2 is detected. Thereby, it is possible to grasp from the remote host device where the mobile terminal 2 is located in the house.

  The base station 1 adjusts the communication area only for a predetermined time. During other times, the entire house is always used as a communication area, thereby improving usage efficiency.

  The base station according to Embodiment 2 has the following effects. That is, the base station 1 of the second embodiment is a base station that performs radio communication with the mobile terminal 2 and adjusts the communication area by changing the transmission power, and the base station when the mobile terminal 2 is detected. The position of the mobile terminal 2 is grasped from the transmission power of 1. Thereby, it is possible to grasp from the remote host device where the mobile terminal 2 is located in the house.

(Embodiment 3)
In addition to the configuration shown in the first or second embodiment, the radio communication system according to the present embodiment can receive large-capacity packet data only when the mobile terminal 2 is connected to the micro base station. To do.

  When the identified mobile terminal 2 that can communicate with the micro base station is not connected to the registered micro base station, the base station device 1 or its host device can receive large-capacity data exceeding several Mbytes such as a moving image. Without receiving, only partial information such as label information such as a shortcut is transmitted to the mobile terminal 2.

  When it is confirmed that the mobile terminal 2 is connected to the registered micro base station, the base station apparatus 1 receives the request from the mobile station, or automatically, via the micro base station, the mobile terminal 2 All information of large-capacity data is transmitted.

  FIG. 7 shows a flowchart of the above operation. After performing the aliasing function (step S1), the base station apparatus / base station host apparatus determines whether or not a large-capacity data download request has been made from the mobile terminal 2 (step S2). When there is a request for downloading large-capacity data, it is determined whether or not the mobile terminal 2 is communicating with the micro base station (step S3). If it is not communicating with the micro base station, the base station / base station host apparatus transmits only partial data information to the mobile terminal 2 (step S4), and the process ends. If the mobile terminal 2 is communicating with the micro base station, the base station / base station host apparatus transmits all of the data to the mobile terminal 2 (step S5), and the process ends.

  If there is no large-volume data download request from the mobile terminal 2 in step S2, there is a file to be downloaded (there is only partial data information (alias)) (yes in step S6), and the mobile terminal 2 is very small. When communicating with the base station (Yes in step S7), the base station / base station host apparatus transmits all information of the large volume data to the mobile terminal 2 via the micro base station (step S8). The transmission timing may be transmitted when there is a request from the mobile terminal 2, or may be transmitted automatically.

  That is, the base station 1 transmits all information to the mobile terminal 2 through the micro base station when the mobile terminal 2 is connected to a predetermined micro base station, and in other cases, the partial information Is transmitted to the mobile terminal 2. As a result, the user who owns the mobile terminal 2 receives most of the packet data via the micro base station, and the fee is fixed when the mobile terminal 2 passes through the micro base station. Is advantageous in that the packet usage fee can be kept low.

  In the case of W-CDMA, the base station / base station host apparatus communicates with the mobile terminal 2 in which the micro base station is registered by receiving a random access channel such as RACH or by an IP number identifying the micro base station. You can confirm that you are doing.

  The mobile terminal 2 registered in the micro base station is a mobile terminal 2 that can communicate with the micro base station, and an identification medium such as a USIM card is used as the mobile terminal and the base station apparatus 1. You can register by using both.

<Effect>
The wireless communication system according to the present embodiment has the following effects. That is, in the radio communication system according to the present embodiment, the base station 1 transmits all information to the mobile terminal 2 through the micro base station when the mobile terminal 2 is connected to a predetermined micro base station. In other cases, only part of the information is transmitted to the mobile terminal 2. As a result, the user who owns the mobile terminal 2 receives most of the packet data via the micro base station, and the fee is fixed when the mobile terminal 2 passes through the micro base station. Is advantageous in that the packet usage fee can be kept low.

  Moreover, according to the base station of this Embodiment, there exist the following effects. That is, the base station according to the present embodiment transmits all information to the mobile terminal 2 via the micro base station when the mobile terminal 2 is connected to a predetermined micro base station. Is characterized in that only some information is transmitted to the mobile terminal 2. As a result, the user who owns the mobile terminal 2 receives most of the packet data via the micro base station, and the fee is fixed when the mobile terminal 2 passes through the micro base station. Is advantageous in that the packet usage fee can be kept low.

  1, 1a, 1b base station, 2 mobile terminals, 3-5 transceivers, 10, 15-17 antennas, 11 frequency-specific transceivers, 12, 18-20, known symbol correlation calculation unit, 21 maximum value determination unit, 13 , 22 Threshold comparison location determination unit.

Claims (11)

A base station,
A mobile terminal that performs wireless communication with the base station,
The base station has a plurality of separated communication areas,
The wireless communication system, wherein the mobile terminal enables the base station to identify in which communication area the communication is performed, and communicates with the base station. A base station,
Multiple transceivers,
A mobile terminal that performs wireless communication with the base station via the transceiver;
The plurality of transceivers each have a communication area with the mobile terminal separated from each other,
The wireless communication system, wherein the mobile terminal communicates with the base station by allowing the base station to identify in which communication area the communication is performed.   The wireless communication system according to claim 1 or 2, wherein the base station identifies a communication area in which the communication is performed by using a different radio resource for each communication area.   The radio communication system according to claim 3, wherein the radio resource is a channel, a spreading code, or a time slot that is different for each communication area.   The wireless communication system according to claim 1, wherein the base station identifies the communication area only for a predetermined time. A base station that performs radio communication with a mobile terminal,
A base station characterized by having a plurality of separated communication areas and identifying which communication area the communication is in by using different radio resources for each communication area. A base station,
A mobile terminal that performs wireless communication with the base station,
The base station adjusts the communication area by changing the transmission power, and grasps the position of the mobile terminal from the transmission power of the base station when the mobile terminal is detected. .   The wireless communication system according to claim 7, wherein the base station adjusts the communication area only for a predetermined time. A base station that performs radio communication with a mobile terminal,
A base station characterized by adjusting a communication area by changing transmission power, and grasping a position of the mobile terminal from transmission power of the base station when the mobile terminal is detected.   The base station transmits all information to the mobile terminal via the micro base station when the mobile terminal is connected to a predetermined micro base station, otherwise only partial information Is transmitted to the mobile terminal. The radio communication system according to any one of 1 to 5, 7, and 8.   When the mobile terminal is connected to a predetermined micro base station, all information is transmitted to the mobile terminal via the micro base station, and in other cases, only partial information is transmitted to the mobile terminal. The base station according to claim 6 or 9, wherein the base station transmits.

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