JPH07284156A - Peripheral reception station equipment for mobile communication - Google Patents

Abstract

PURPOSE:To provide the peripheral reception station equipment for mobile communication whose size is made small with simple configuration without need for number of receivers by channel number used by a base station. CONSTITUTION:When a call signal is sent from a mobile station (not shown) to a base station through a control channel, the signal is received by an antenna 21 of the peripheral reception station, a control channel frequency conversion section 23 converts the frequency of the signal into a prescribed frequency and sends the resulting signal from an antenna 22 to the base station. When the base station allocates a channel used for the mobile station, a base station supervisory reception section 25 reads it and informs it to a channel control section 26. Upon the receipt of the notice, the channel control section 26 selects an idle control section among voice channel frequency control sections 24-1-24-n to provide a command of channel reception. Upon the receipt of a voice channel from the mobile station by the antenna 21, the selected voice channel frequency control section converts the frequency of the signal into other frequency and outputs the resulting signal to the base station from the antenna 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peripheral receiving station device for mobile communication, and more particularly, to enable the number of receivers in the peripheral receiving station to be equal to the number of channels corresponding to the size covered by the peripheral receiving station. As a result, the present invention relates to a peripheral receiving station device for mobile communication, which can be miniaturized and can be manufactured at low cost.

[0002]

2. Description of the Related Art In a mobile communication system, an uplink from a mobile station (that is, a line from a mobile station to a base station).
In order to improve the communication quality of the above, there is a system in which a plurality of peripheral receiving stations for receiving upstream signals are installed in the area covered by the base station. FIG. 7 is a diagram showing an outline thereof, where a1 is a service area covered by the base station 1, and a2 is a service area.
Is an area covered by the peripheral receiving station 2 and 3 is the area a2
In the figure, a mobile station, a3, indicates an area covered by another peripheral receiving station 4. In this system, the upstream RF signal s from the mobile station 3 received by the peripheral receiving station 2 is demodulated once into a baseband signal and transmitted to the base station 1 through the metallic transmission line 5 or the like.

FIG. 8 is a diagram showing an outline of the peripheral receiving station 2. The peripheral receiving station 2 has as many receivers 2a to 2n as the number of channels used by the base station 1. These receivers are composed of a high frequency amplifying unit, a frequency converting unit, an intermediate frequency amplifying unit, a demodulating unit, etc., and function to convert the RF signal s received from the mobile station 3 into a baseband signal. The R output from any of the receivers 2a to 2n
The baseband signal of the F signal s is transmitted to the base station 1 through the corresponding metallic transmission path 5. In the base station 1, the quality of the baseband signal obtained by demodulating the signal directly received from the mobile station 3 and the quality of the baseband signal obtained through the metallic transmission path 5, for example, the signal-to-noise ratio is determined, The quality of the uplink is improved by selecting the best quality baseband signal.

[0004]

As described above, in the conventional peripheral receiving station, in order to demodulate the RF signal s received from the mobile station into the baseband signal, the number of channels used by the base station is reduced. A receiver and a metallic transmission line were needed. For this reason, there have been problems that the equipment configuration of the peripheral receiving station becomes complicated and large, restrictions occur in the installation location, and installation work becomes difficult. Further, there is a problem that the cost for creating the peripheral receiving station becomes high.

An object of the present invention is to eliminate the above-mentioned problems of the prior art, to eliminate the need for receivers for the number of channels used in the base station, and to eliminate the need for metallic transmission lines, which is a simple structure. Another object of the present invention is to provide a mobile communication peripheral receiving station device which can be miniaturized.

[0006]

To achieve the above object, the present invention provides a mobile communication peripheral receiving station arranged to receive an upstream signal from a mobile station within an area covered by a base station. In the device, a frequency conversion unit for a control channel for converting the frequency of the control channel transmitted from the mobile station into a predetermined frequency, and the frequency of the voice channel transmitted from the mobile station are set to a predetermined frequency for each voice channel. An arbitrary number of frequency conversion units for voice channels to be converted to, a base station monitoring reception unit for monitoring a control channel based on the information received from the base station, and an empty voice channel frequency from the frequency conversion unit for voice channels. A channel control unit for selecting a conversion unit and transmitting the channel information detected by the base station monitoring reception unit to the voice channel frequency conversion unit. It is characterized by a point.

Further, in addition to the above-mentioned structure, a feature is that a mobile station monitoring receiving section is provided which functions to constantly scan and monitor the reception levels of all the upstream channels assigned to the base station. .

[0008]

According to the present invention, when there is a call from the mobile station, the base station monitoring receiver recognizes the channel assigned by the base station and notifies the channel controller of this.
Upon receiving this notification, the channel control unit selects a vacant voice channel frequency conversion unit and instructs the voice channel frequency conversion unit to receive the voice channel of the channel. When the voice channel frequency converter receives the voice channel from the mobile station, the voice channel frequency converter converts the voice channel to a frequency corresponding to the voice channel and transmits the frequency to the base station. As a result, the peripheral receiving station need only have a number of frequency conversion units for voice channels determined by the size of the area it covers or the amount of traffic, which simplifies the configuration of the peripheral receiving station. There is an effect that it can be miniaturized. Further, when the mobile station monitoring receiver is provided,
Even when the mobile station starts a call outside the area covered by the peripheral receiving station and moves into the peripheral receiving station area during a call, the peripheral receiving station can be effectively operated.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. FIG. 3 is a diagram showing a service area of the base station 11 to which the peripheral receiving station device of one embodiment of the present invention is applied. In this embodiment, the base station 11 has a service area a1.
It is assumed that m peripheral receiving stations 12b1 to 12bm are arranged in the service area a1. b1
.About.bm indicate the coverage areas of the peripheral receiving stations 12b1 to 12bm. Reference numeral 13 indicates a mobile station existing in the cover area b1, for example.

The peripheral receiving station 12b in such a case
The configuration of 1 to 12 bm and the configuration of the base station 11 will be described with reference to the block diagrams of FIGS. 1 and 2, respectively. In addition,
The peripheral receiving stations 12b1 to 12bm have the same configuration except the number of voice channel frequency conversion units described later, and therefore the peripheral receiving station 12b1 which is one of the peripheral receiving stations 12b1 to 12bm is taken as a representative. 1 will be described with reference to FIG. This peripheral receiving station 12b1
It is assumed to have n frequency conversion units for voice channels.

In FIG. 1, reference numeral 21 denotes a receiving antenna, 2
Reference numeral 2 is a relay antenna, 23 is a control channel frequency conversion unit for converting the control channel frequency of the control channel received from the reception antenna 21, and reference numerals 24-1 to 24-n are voice channels received from the reception antenna 21. A voice channel frequency conversion unit having a frequency synthesizer function for converting a relay voice channel frequency, 25 is a base station monitoring reception unit, 26 is a channel control unit, and 27a and 27b are antenna common units.

Next, the operation of the peripheral base station 12b1 will be described. First, the receiving antenna 21 is the peripheral receiving station 12b1.
When the control channel upstream RF signal s is received from the mobile station within the service area b1 of 1, the control channel frequency converter 23 converts the control channel upstream RF signal s into a relay control channel. The relay control channel is transmitted to the base station 11 through the relay antenna 22.

The base station monitoring receiver 25 monitors the information in the control channel downlink RF signal received from the base station 11 through the relay antenna 22, and the service area a
Read the channel specification signal sent to the mobile station in 1. Then, the channel designation signal is sent to the channel control unit 26.
Send to.

When the channel control unit 26 receives the channel designation signal, it recognizes the voice channel to be received and the frequency conversion unit 24 for the voice channel which is not used at that time.
Then, the channel information is transmitted so as to set the received voice channel and the relay voice channel corresponding to the voice channel. Next, the voice channel frequency conversion unit 24 receives the voice channel upstream RF signal s from the mobile station,
It is converted into a corresponding relay voice channel and is transmitted to the base station 11 through the relay antenna 22. When performing frequency conversion, the voice channel frequency conversion unit 24 sets a threshold value for the level of the upstream RF signal from the mobile station, and performs frequency conversion when the signal level is equal to or higher than the threshold value. If not, frequency conversion is not performed.

By the above operation, the voice channel from the mobile station is converted into the relay voice channel and sent to the base station. The number of the voice channel frequency converters 24 is determined according to the traffic volume of each of the coverage areas b1 to bm of the peripheral receiving stations 12b1 to 12bm. For example, the peripheral receiving stations 12bm are 24-1 to 24-
It has n ′ voice channel frequency converters.

Next, FIG. 2 shows an embodiment of the configuration of the base station.
Will be described with reference to. In the figure, 30 is a control channel radio transceiver, 36 is an antenna shared unit, 37 is a base station antenna, and 40-1 to 40-i are i voice channel radio transceivers.

The control channel radio transmitter / receiver 30 receives a base station upstream channel from a transmitter 31, which transmits a control channel of a base station downlink channel to peripheral receiving stations and mobile stations, and receives the reception level information. Level comparison unit 34
And the peripheral receiving units 33-1 to 3-3 that receive the relay channel signal whose frequency is converted by the peripheral receiving station and send the reception level information to the level comparing unit 34.
3-m, the level comparison unit 34, and the level comparison unit 34
The output selection unit 35 selects the demodulation output from the direct reception unit 32 and the peripheral reception units 33-1 to 33-m in accordance with the selection signal from.

Also, a voice channel radio transceiver 40-1
Has the same or similar configuration as the control channel, and includes a transmitter 41, a direct receiver 42, and a peripheral receiver 43-1.
1 to 43-1m, a level comparing section 44, and an output selecting section 45. Here, m is the number of peripheral receiving stations. 40-2 to 40-i are voice channel radio transceivers having the same configuration as the voice channel radio transceiver 40-1, respectively, and the voice channel radio transceivers are the number of channels of the base station itself, i in this case. Is provided.

Next, with reference to FIG. 4, the transmitting operation from the mobile station in this embodiment will be described. In the figure, the mobile station 13, the peripheral receiving station 12, and the base station 11 are sequentially shown from the right to the left, and the vertical line represents time.

(1) At the time of transmission, the mobile station 13 has the base station 11
To the control channel (hereinafter abbreviated as Fc). This Fc is received by the peripheral receiving station 12 and the base station 11. The peripheral receiving station 12 sends the received Fc to the control channel frequency conversion unit 23, frequency-converts it into a relay control channel (hereinafter abbreviated as Fc1), and transmits it from the relay antenna 22 to the base station 11. On the other hand, the base station 11
Receives the transmission signal from the mobile station 13 directly at the receiving unit 32. At the same time, the base station 11 compares the reception levels of Fc1 received by the peripheral reception unit 33 and Fc directly received by the direct reception unit 32 by the level comparison unit 34, and the stronger demodulation output is output by the output selection unit 35. Select with.

(2) Next, the base station which has received the transmission signal transmits the transmission reception signal by Fc from the base station antenna 37 via the transmission unit 31 and the antenna common unit 36.

(3) Next, the mobile station receiving the call acceptance signal sends out a call origination information signal such as a subscriber number at Fc. The peripheral receiving station 12 receives the F
The frequency of c is converted to Fc1 and transmitted to the base station 11.
The base station 11 compares the reception levels of Fc directly received and Fc1 received from the peripheral reception station 12 and selects the demodulation output of the stronger one.

(4) Next, from the base station 11 to the mobile station 13,
A channel designating signal (designated frequency is Fi) is transmitted by Fc. The base station monitoring receiver 25 of the peripheral receiving station 12 is F
The channel designation signal of c is read and sent to the channel control unit 26. The channel control unit 26 instructs the frequency conversion unit 24 for an unused voice channel in the local station to receive a voice channel (hereinafter abbreviated as Fi). Mobile station 1
3 receives the channel designation signal and shifts to Fi.

(5) The mobile station 13 shifts to a call at Fi. When receiving the Fi from the mobile station 13, the voice channel frequency converter 24 waiting for reception at Fi of the peripheral receiving station 12 is a relay voice channel (hereinafter abbreviated as Fi1) if the reception level is equal to or higher than the threshold value. To convert and send. on the other hand,
If the reception level is less than the threshold value, the reception is stopped for a while and the operation returns to the standby state. The base station 11 directly receives Fi received by the receiving unit 32 and Fi1 received by the peripheral receiving unit 33.
Compare the reception levels of and select the stronger demodulation output to talk.

(6) Immediately when a disconnection signal is input from the base station 11, on the other hand, when the reception level of the Fi signal from the mobile station 13 falls below the set value, reception is continued for a certain period of time. Then return to the standby state.

FIG. 5 shows an uplink channel relationship between the mobile station 13-peripheral receiving station 12-base station 11. That is, the control channel Fc transmitted from the mobile station 13 is frequency converted into Fc1 by the control channel frequency converter 23 in the peripheral receiving station 12b1 and received by the peripheral receiving unit 33-1 of the base station 11. On the other hand, the peripheral receiving station 1
At 2bm, Fc is controlled by the control channel frequency conversion unit 23.
The frequency is converted into m, and the peripheral receiving unit 33-m of the base station 11
Will be received at.

The voice channel Fi of the mobile station 13 is
In the peripheral receiving station 12b1, the frequency conversion unit 24-1 for the voice channel, for example, converts the frequency into Fi1 and the base station 1
It is received by the peripheral receiving unit of one voice channel 40-i. Further, the voice channel Fi is a peripheral receiving station 12bm.
Then, the frequency is converted to, for example, Fim, and is received by the peripheral receiving unit of the voice channel 40-i of the base station 11. In the example of FIG. 5, the peripheral receiving stations 12b1 and 12bm are
Voice channel frequency converters 24-1 to 24-n, 24-1 to 24-
n '. As a specific example, in the mobile communication system of FIG. 3, the number of channels of the base station 11 is 20,
When the number of peripheral receiving stations is 2, the number of voice channel frequency converting units of the first peripheral receiving station 12b1 is 5, and the number of voice channel frequency converting units of the second peripheral receiving station 12b2 is 14 1 to FIG. 3 and FIG.
= 20, m = 2, n = 5, n '= 14.

As described above, according to this embodiment, it is sufficient to provide the frequency conversion units for the voice channels corresponding to the size of the area covered by the peripheral receiving station or the number of channels corresponding to the traffic amount. There is an effect that the number of receivers required for the number of channels can be reduced. Therefore, the manufacturing cost of the peripheral receiving station can be significantly reduced, the peripheral receiving station can be miniaturized, and the restrictions on the installation location can be greatly relaxed.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a block diagram showing a configuration of a peripheral receiving station, and a point different from the configuration of FIG. 1 of the first embodiment is that a mobile station monitoring receiving unit 28 is provided. Other reference numerals indicate the same or equivalent parts in FIG. The mobile station monitoring receiver 2
8 constantly scans and monitors the reception levels of all the uplink channels assigned to the base station. When the reception level of a certain value or more is obtained, the channel number is sent to the channel control unit 26. Send out.

Therefore, in this embodiment, when the mobile station starts a call outside the area covered by a peripheral receiving station and moves into the peripheral receiving station area during a call, the mobile station monitoring receiving section 28 detects this and notifies the channel control unit 26. The channel control unit 26 instructs the frequency conversion unit for the vacant voice channel to receive the channel. As a result, according to the present embodiment, it is possible to effectively operate even when the mobile station starts a call outside the area covered by a peripheral receiving station and moves into the peripheral receiving station area during a call. You can

[0031]

According to the first and second aspects of the present invention, the number of voice channel frequency converters corresponding to the size of the area covered by the peripheral receiving station or the amount of traffic may be provided, and the configuration of the peripheral receiving station is improved. There is an effect that it can be simplified and miniaturized. Further, there is an effect that the manufacturing cost of the peripheral receiving station can be significantly reduced. Further, restrictions on the installation location of the peripheral receiving station are alleviated, and for example, it is possible to install on a rooftop of a small building which could not be installed up to now, and there is an effect that installation work is simplified.

According to the third aspect of the present invention, when the reception level is less than the predetermined threshold value, the frequency conversion is not performed, so that the voice channel frequency conversion section is not wastefully used. The effect is that the voice channel frequency converter can be effectively used only when the reception level is equal to or higher than the threshold value.

According to the invention of claim 4, it is possible to eliminate the transmission lines such as metallic lines for the number of base station channels, which has been conventionally required, and it becomes unnecessary to install or borrow the transmission lines.

According to the invention of claim 5, even when the mobile station starts a call outside the area covered by the peripheral receiving station and moves into the peripheral receiving station area during the call, the peripheral receiving station It becomes possible to operate effectively.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a peripheral receiving station according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a base station according to an embodiment of the present invention.

FIG. 3 is a conceptual diagram of a mobile communication system in which the peripheral receiving station of the present embodiment is used.

FIG. 4 is a diagram showing a sequence of a mobile station transmitting operation according to an embodiment of the present invention.

FIG. 5 is a diagram showing a channel relationship between a base station, peripheral receiving stations, and mobile stations.

FIG. 6 is a block diagram showing a configuration of a peripheral receiving station according to a second embodiment of the present invention.

FIG. 7 is a conceptual diagram of a conventional mobile communication system.

FIG. 8 is a diagram showing an outline of a configuration of a conventional peripheral receiving station.

[Explanation of symbols]

21 ... Receiving antenna, 22 ... Relay antenna, 23 ...
Frequency converter for control channel, 24-1 to 24-n (n
???) ... Voice channel frequency conversion unit, 25 ... Base station monitoring reception unit, 26 ... Channel control unit, 27a, 27b ... Antenna shared unit, 28 ... Mobile station monitoring reception unit.

Claims (5)

[Claims] 1. In a peripheral receiving station device for mobile communication arranged to receive an upstream signal from a mobile station within an area covered by a base station, a frequency of a control channel transmitted from the mobile station is set to a predetermined value. A control channel frequency conversion unit for converting the frequency, a frequency of a voice channel transmitted from a mobile station, an arbitrary number of voice channel frequency conversion unit for converting the frequency of the voice channel to a predetermined frequency for each voice channel, A base station monitoring receiver for monitoring channel information in a control channel from a base station, and a vacant voice channel frequency converter from the voice channel frequency converter, and the voice channel frequency converter selects the vacant voice channel frequency converter. A channel control unit for transmitting the channel information detected by the base station monitoring reception unit, wherein the frequency is selected by the frequency conversion unit for the selected voice channel. Conversion to mobile peripheral reception station device of a communication, characterized in that it has to transmit to the base station. 2. The mobile communication peripheral receiving station apparatus according to claim 1, wherein the number of the voice channel frequency converting units is determined by a size of an area covered by the peripheral receiving station, a traffic amount, and the like. A peripheral receiving station device for mobile communication, characterized in that 3. The mobile communication peripheral receiving station apparatus according to claim 1, wherein the voice channel frequency conversion unit determines a reception level, and when the reception level is less than a predetermined threshold value, frequency conversion is performed. A peripheral receiving station device for mobile communication, characterized in that it is not performed. 4. The peripheral receiving station apparatus for mobile communication according to claim 1, wherein the control channel frequency conversion unit and the voice channel frequency conversion unit frequency-converted control channel information and voice channel information are transmitted to the base station. A peripheral receiving station device for mobile communication, comprising: 5. The mobile communication peripheral receiving station apparatus according to claim 1, further comprising a mobile station monitoring receiving unit that functions to constantly scan and monitor the reception levels of all the uplink channels assigned to the base station. Then, the mobile station monitoring reception unit detects a mobile station that has entered an area covered by the peripheral reception station and notifies the channel control unit of the peripheral reception of mobile communication. Station equipment.