JPH10107727A - Radio relay system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the number of radio channels used by other radio terminal equipments by avoiding occurrence of radio wave interference even when a repeater uses a transmission reception antenna for base station communication and transmission reception antenna for terminal equipment communication in common. SOLUTION: A radio repeater 104 includes at least a 1st antenna 105 to send a radio wave to a radio base station 103 and a 2nd antenna 106 to send a radio wave to a terminal equipment 107. In the case of communication with the radio base station 103, the 1st antenna 105 is used and in the case of communication with the radio terminal equipment 107, the 2nd antenna 106 is used, and an arrival range of a radio wave in the case of communication from the repeater by the 1st antenna 105 is differentiated from an arrival range of a radio wave in the case of communication from the repeater by the 2nd antenna 106. Thus, the influence of the frequency and the transmission slot used for the communication with the radio terminal equipment 107 onto other radio base stations is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio relay system that uses a repeater to perform radio communication with a radio base station in a radio communication.

[0002]

2. Description of the Related Art PHS (Pers.
(Onal Handy Phone System: personal handy phone system), the average output power of the terminal is 10mW, the frequency of 1.9GHz band is adopted, and the communication area per base station is several hundred meters. is there. on the other hand,
Considering the usage environment of the mobile phone, indoors, the radio wave is greatly attenuated in the 1.9 GHz band due to shielding by a building, and the communicable area is an extremely limited area around the base station.

[0003] Therefore, a method using a wireless repeater is generally adopted mainly in order to expand a communication area indoors or the like.

[0004]

Conventionally, when a radio repeater is used in a mobile communication system such as a PHS, a transmission / reception antenna used for communication with a base station and a transmission / reception antenna used for communication with a terminal are shared. There was a case.
In such a case, since the frequency band allocated to the PHS terminal is the same as the frequency band used for transmission from the relay station to the base station, radio interference occurs, and as a result, a radio channel that can be used by another radio terminal And the wireless channel utilization efficiency is reduced.

Similarly, when the number of users increases and the traffic increases, there is a problem that the number of wireless terminals that cannot be communicated due to the restriction on the frequency used increases.

[0006]

Means for Solving the Problems In order to solve the above problems, the configuration of the invention related to the wireless relay system of the present invention includes a wireless base station 103, a wireless terminal 107, the wireless base station 103, and the wireless terminal. And 107, a wireless repeater 104 used for wireless communication.
Has a plurality of antennas, includes at least a first antenna 105 for transmitting radio waves to the radio base station 103 and a second antenna 106 for transmitting radio waves to the radio terminal, and performs communication with the radio base station 103. Means 405, 4 using the second antenna 106 when performing communication with the wireless terminal 107 using the first antenna 105
07, the directivity of the first antenna and the directivity of the second antenna are different from each other, or the direction of the first antenna and the direction of the second antenna are directed in different directions, Means 407 for making the reach of the previous radio wave when communicating with the first antenna from the repeater and the reach of the radio wave when communicated with the second antenna from the repeater different from each other, The frequency and the transmission slot used for communication with the wireless terminal can reduce the influence on other wireless base stations.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described below with reference to the drawings.

First, a first embodiment of the present invention will be described.

[0009] The first embodiment is a radio repeater,
A plurality of antennas having different directivities are provided, each of which is controlled, so that radio interference to other radio base stations and radio terminals can be reduced.

FIG. 1 is a configuration and a conceptual diagram of the first embodiment.

In the figure, 101 is an existing communication network, 102 is an exchange, 103 is a wireless base station, 104 is a wireless repeater, 105
Denotes a first antenna, 106 denotes a second antenna, and 107 denotes a wireless terminal. Here, typical examples of the wireless terminal 107 include a mobile phone and a PHS.

In FIG. 1, a wireless base station 103 is connected to an existing communication network 101 via an exchange 102, and a wireless terminal 107 transmits and receives a wireless signal to and from a wireless repeater 104. Device 104 is a radio base station 10
The wireless terminal 107 can transmit / receive a wireless signal to / from the wireless communication device 3, and as a result, can connect to the existing communication network.

In FIG. 1, the radio repeater 104 includes:
When communicating with the radio base station 103, the first antenna 105 is selected and used, and when communicating with the terminal 107, the second antenna 106 is selected and used.

Next, the configurations of the radio terminal 107, the radio repeater 104, and the radio base station 103 will be described with reference to FIGS.

FIG. 2 is a block diagram showing a configuration of the wireless terminal 107.

FIG. 3 is a block diagram showing the configuration of the radio base station 103.

FIG. 4 is a block diagram showing the configuration of the wireless repeater 104.

Radio terminal 107 shown in FIG. 2 has a speaker 201, a microphone 202,
, A channel codec unit 204, a modulation unit 205,
Demodulation section 206, high frequency (RF) section 207, antenna 208, bus 209, control section 210, storage section 21
1, a display unit 212, and a keypad 213.

The basic configuration of the wireless base station 103 shown in FIG.
01, in that a line 301 and a line interface unit 302 are provided instead of the microphone 202, and that the display unit 212 and the keypad 213 are omitted.

Radio relay 104 shown in FIG. 4 has the same basic configuration as terminal 107 and base station 103 but has a plurality of antennas, first antenna 105 and second antenna 106. , And an antenna switch 405.

When communicating with the wireless base station 103 using the control unit 407, the wireless repeater 104 performs communication by performing control to switch the antenna changeover switch 405 to the first antenna 105. Further, at the time of communication with the wireless terminal 107, control is performed to switch the antenna changeover switch 405 to the second antenna 106 to perform communication.

FIG. 5 shows a frame structure for explaining the communication timing of the radio repeater and the antenna switching timing.

In the communication system according to the present embodiment, a frame which is a basic period of signal transmission or reception is determined, and the frame is allocated to several times (slots) to enable mutual communication. Depending on the multiple access (hereinafter, referred to as TDMA (Time Division Multiple Access)) communication method, the wireless relay station 1
04 and the wireless terminal 107. .

Further, in the present embodiment, a so-called TD in which a transmission signal and a reception signal are allocated in one frame.
Communication is performed by a D (time division duplex) communication method.

As shown in FIG. 4, in the present embodiment, a case is described in which one frame is composed of a total of eight slots of four transmission slots and four reception slots.

In FIG. 5, a frame 501 includes a transmission slot group 202 and a reception slot group 503.
Further, the transmission slot group includes transmission slots A (502a) to
The reception slot group 503 includes reception slots D (502d) to D (503d).

Now, the radio repeater 104 is a radio base station 1
When using the transmission / reception slot A (502a and 503a) when communicating with the wireless base station 03, the control unit 407 of the wireless repeater recognizes the base station ID given to the wireless base station 103 in advance, and the control unit 407 Immediately before using this slot, an instruction is given to switch the antenna changeover switch 405 to the first antenna 105 side, and communication is performed using the antenna 105.

Subsequently, the wireless repeater 104 is connected to the wireless terminal 1.
When using the transmission / reception slot C (502c and 503c) when communicating with the communication terminal 07, when the control unit 407 of the wireless repeater recognizes the terminal ID given to the wireless terminal 103 in advance, the control unit 407 uses this slot. Immediately before using, an instruction to switch the antenna switch 405 to the second antenna 106 side is issued, and communication is performed using the antenna 106. FIG. 6 is a flowchart illustrating a method of determining the antenna switching timing.

When communication is started, the antenna switch is set to the antenna for the radio base station (601), and synchronization with the radio base station is established (602). At this time, the transmission / reception slot for the wireless base station is determined (603). Next, the antenna switching timing for the wireless base station is determined immediately before the transmission / reception slot for the wireless base station (60).
4). Slots other than the base station transmission / reception slots are determined as terminal transmission / reception slots (605). Finally,
The timing of switching the antenna for the wireless terminal is determined immediately before the transmission / reception slot for the wireless terminal (606).

[0030]

As described above, according to the present invention, the radio repeater has two antennas, one for the radio base station and one for the radio terminal. It is possible to accommodate more subscribers in the same area, which has a great effect on improving communication efficiency.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a wireless relay system according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a wireless terminal according to the present invention.

FIG. 3 is a configuration diagram of a wireless base station according to the present invention.

FIG. 4 is a configuration diagram of a wireless repeater of the present invention.

FIG. 5 is a frame configuration diagram of the present invention.

FIG. 6 is a diagram showing a flowchart of antenna switching timing determination according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 ... Existing communication network 102 ... Exchanger 103 ... Wireless base station 104 ... Wireless repeater, 105 ... First antenna 106 ... Second antenna 107 ... Wireless terminal 405 ... Antenna changeover switch

Claims (5)

[Claims] 1. A communication network, an exchange connected to the communication network, a radio base station connected to the exchange and having a plurality of radio channels, a radio terminal communicating with the radio base station, and at least a base station A wireless relay that includes a dedicated antenna for wireless communication and a dedicated antenna for wireless terminals and relays communication between the wireless base station and the wireless terminal; and the wireless base station provided in the wireless relay and using the dedicated antenna for wireless base station And a means for establishing a wireless line with the wireless terminal using a dedicated antenna for the wireless terminal provided in the wireless repeater. 2. A communication network, an exchange connected to the communication network, a radio base station connected to the exchange and having a plurality of radio channels, a radio terminal communicating with the radio base station, and a radio base station. Including a repeater for relaying communication between the station and the wireless terminal, including a plurality of antennas in the repeater, distinguishing the plurality of antennas from a dedicated antenna for a base station and a dedicated antenna for a wireless terminal, for each transmission slot, A wireless relay system having a function of switching between the dedicated antenna for the base station and the dedicated antenna for the wireless terminal for each reception slot, and performing communication. 3. The radio relay system according to claim 1, wherein a range of radio waves when communication is performed from said repeater with a dedicated antenna for said base station, and a dedicated antenna for said wireless terminal from said repeater. A radio relay system, wherein the directivity of the plurality of antennas is selected and communication is performed so that the range of radio waves at the time of communication is different. 4. The radio relay system according to claim 1, wherein a range of radio waves when the relay repeater communicates with the base station dedicated antenna, and a dedicated antenna for the wireless terminal from the repeater. A wireless relay system that selects the mounting positions of the plurality of antennas and performs communication so that a radio wave reach range when the communication is performed is different. 5. The wireless relay system according to claim 1, wherein a communication slot between the wireless base station and the wireless repeater is first determined, and then the wireless terminal and the wireless repeater are determined. Wireless communication system, wherein the communication slot is allocated, and the antenna switching timing is determined, and the dedicated antenna for the base station and the dedicated antenna for the wireless terminal are switched at the timing to perform communication.