JPH11317702A - Cellular radio communication system using fixed terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cellular radio communication system (e.g. GSM radio telegraphy system) having a fixed terminal. SOLUTION: The cellular radio communication system is disclosed as a one which provides a communication between a base station 6 and a mobile or fixed terminal. The fixed device has a directional antenna 4 which is fixed while directed to the predetermined base station 6. A connector 10 is prepared so as to connect the mobile terminal 16 to the antenna 4. When the connector is connected to the mobile terminal, information transmitted over an uplink signaling system channel includes representation showing that the fixed antenna is in use. This enables a subscriber to use one mobile telephone set for both a fixed and a mobile communication. Consequently, only one bill is needed and at the same time, the telephone service provider can lower the charge rates for fixed services to the level that the services can compete with services provided through land lines.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cellular radio communication system having fixed terminals (for example, a GSM radio communication system).

[0002] Cellular wireless communication systems are mainly
Used to provide telephone and / or data services to mobile terminals. In the race for traditional telephone services, where subscribers are connected by landlines to a switching center, providers of cellular wireless communication system services have sought to provide services to fixed terminals. Fixed terminals can use advanced directional antennas that allow their communication channels to be reused at closer base stations than would be possible if advanced directional antennas were not used. is there. This means that the number of times a frequency band can be reused increases. That allows the telephone service provider to reduce the tariff for the fixed service, so that the service provided to the fixed terminal by the wireless communication system is provided via the land line. Competitive services and competition.

[0003] Against this background, a fixed directional antenna directed to a predetermined base station for communication between a base station and a mobile or fixed terminal, and a connection for communication between the mobile terminal and the antenna. A cellular wireless communication system is provided that includes a fixed device consisting of a device, in which information transmitted on an uplink signaling channel is fixed when communication is via a connector. The base station includes an array of two or more antennas and downlinks from individual antennas to generate lobes that are directed to known fixed device locations, including an indication that the antennas are in use. Means for responding to the receipt of the indication for adjusting the phase of the transmission and reducing the power of the downlink transmission to the fixed device. This allows the subscriber to use one mobile telephone set for fixed and mobile communications, thus requiring only one bill and allowing the telephone service provider to be provided via landline. Could reduce rates for fixed services to a level that is competitive with existing services.

In one form of presentation, the connector includes a connector, the mobile terminal includes a switch or a proximity detector operated when the connector is connected to the mobile station, and the mobile terminal transmits the indication to transmit the indication. In response to the operation of the switch or proximity detector.

In another form of expression, the connector is:
Includes wireless transmitter / receiver for communication with mobile terminals. The connector may include means for compressing a code readable by a mobile terminal responding to the code to transmit the indication. In such a representation, the transmitted indication may be a code.

In an alternative form of expression, the connector is:
A processor capable of encoding word data received from the mobile terminal and returning the encoded words to the terminal, the mobile terminal performing similar encoding, and The indication is transmitted to the base station only if the words are identical.

[0007] The base station may have a plurality of antennas each having a delay line connected by providing each tap to which the output signal of the tap is weighted and added in the delay line. Immediately after reception, the weights are determined to direct the lobe to a known location on the fixed device. That means that further reductions in the power of transmissions on the uplink, further reduction of interference from fixed stations, and, if anything, the channels of the uplink are reused by closer base stations or mobile terminals. To allow and / or reduce interference. The system preferably includes a toll center that reduces the rate during calls where the base station is receiving the indication.

[0008] Embodiments of the present invention will now be described, by way of example, with reference to the accompanying diagrams.
Referring to the figure, a building, such as a subscriber home 2, has a directional antenna, such as a Yagi antenna, fixedly mounted thereon. The antenna 4 is designed to have a narrow bundle of beams for both reception and transmission at that station. The beam is directed to base station 6.

The antenna 4 is connected to the connector part 10 via a coaxial cable. Component 10 of connector
Is the supplementary connector 14 in the mobile phone set 16
And a connector 12 having a plurality of circuits for connection to the connector. Connector 12 is the omnidirectional antenna 2 of the mobile phone.
The switch 18 is actuated when connected to the changeover switch contact 20 through the connection of the output of the telephone broadband power amplifier 22 to the cable 8 through the connector 12 rather than to the connector 12.

The switch 18 is connected to the connector 12 when connected.
Or may have an operating portion (not shown) that may be in the form of a proximity switch actuated by a magnet 26 in the connector 12. The connector 12 also connects the telephone set 16 to a power supply 28 in the connector 10.

[0011] The operation of the switch or proximity detector 18 is such that, upon indication of the mobile terminal that the mobile terminal is connected to its fixed antenna device, it initiates transmission on the signaling channel in use. It can be used.

Because the antenna is directional, communication on the uplink will be less likely to cause interference with other stations than communication via the mobile phone's omni-directional antenna 24.
With that in mind, the system can provide a channel that is in use by a mobile terminal via a base station or a fixed device of the mobile terminal at a greatly reduced distance compared to where the omni-directional antenna 24 is located. Can be reused. The quality of the directivity of antenna 4 is such that the mobile terminal transmits to base station 6 at reduced power compared to the power that would be required by omni-directional antenna 24, which further reduces interference. Ask them to ask.

Referring to FIG. 4, the base station 6 has a plurality of antennas 30 in a degree-of-branch arrangement each connected to a respective duplexer 50. A transmission circuit 52 and a reception circuit 54 are connected to each duplexer so that signals can be both transmitted and received through the same antenna. The receiving circuit includes the spatio-temporal processor 32 shown in FIG. When the location of the fixed device is known, the controller 56 controls the reception of the display to adjust the phase of the output of the transmitter circuit 52 so that the antenna 30 produces a narrow beam directed to the antenna 4. Respond and reduce power.

The controller also provides information allowing channels in use between the fixed device and the mobile station to be reused in adjacent cells, and to the toll center to reduce rates for calls. Request reduction.

Since the antenna 4 also generates a stronger signal received from the base station 6, the base station
6 can be further reduced on downlink communication of the base station.

On the uplink, each antenna 30 in the array has a respective space / time processor 32, shown in FIG. 2, including a delay line 34 with taps at TS intervals corresponding to one code interval. Have. The output from each tap is weighted by a vector w, and the weighted outputs are added in adder 36. Because the location of the fixed device is known,
The predetermined set of weights can be loaded into a space / time processor to direct the array to antenna 4.

In that system, the simple system described above, in which a switch or proximity detector 18 is actuated by the connector 12, can be misleading and only feasible when the connector includes the connector 12. To further ensure that a cheap rate is provided to the mobile terminal only when the mobile terminal is connected to the antenna 4, the connector 10 may include means 40 for storing the code. In a simple example, the means 40 comprises a switch, for example a DIP (double switch in line),
May be included. The switch may be provided for a predetermined code readable by the mobile terminal 16 via the bus (bus). The code is
It may be used in various ways. For example,
Only when the code is of the same type as the code stored in the mobile terminal, the mobile terminal can transmit the one attached to the antenna indication. Alternatively, the code may be transmitted and a comparison made at the base station.

In another alternative, the connector 10 is controlled by a program stored in a storage device 40 for encoding word data received from the mobile terminal and for sending the encoded words back over the bus 42. Can also include a processor 44 that can be implemented at. The mobile terminal performs a similar coding, and only if the two coded words are the same, the one appended to the antenna indication is transmitted to the base station.

To provide some mobility to the user, the connector 10 shown in FIG. 3 is connected via a wireless communication channel provided by a low power transmitter and receiver 44 and a ceiling mounted antenna 46. To communicate using the mobile terminal 16. The channel may be the same or different from the channel used for communication via a fixed antenna using the base station. In this case, the connector itself may add an indication to the uplink signaling information that the fixed antenna is in use. In the embodiment of FIG. 3, an array of antennas 4 is provided. The beamforming component 48 conditions the signal for each antenna to form a thin bundle beam directed to the base station 6 for both reception and transmission.

[Brief description of the drawings]

FIG. 1 shows a schematic depiction of a fixed device in a cellular wireless communication system when implementing the invention.

FIG. 2 is a diagram illustrating a schematic depiction of an antenna arrangement at a base station in a system embodying the present invention;

FIG. 3 shows a schematic depiction of another system when practicing the present invention.

FIG. 4 is a block diagram illustrating characteristics of a base station.

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[Procedure amendment]

[Submission date] July 7, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Claims (9)

[Claims] 1. A cellular radio communication system providing direct communication between a base station and a mobile terminal over each of a set of radio communication channels allocated for cellular mobile communication. Wherein the system comprises: a base station for communicating between a fixed directional antenna and a predetermined base station over one of the set of wireless communication channels; A fixed device comprising the fixed directional antenna directed to a station and a connector for providing communication between a mobile terminal and the antenna; when the communication is via the connector, Signaling information transmitted on the uplink includes an indication that the fixed antenna is in use; in the system, the base station has two or more antenna arrays; Adjusting the phase of the downlink transmission from the individual antennas to generate a lobe directed to a known location of the fixed device immediately after receiving the indication; and in the system, A cellular wireless communication system in which the base station reduces the power of downlink transmissions to the fixed device. 2. The mobile terminal, comprising a connector, responsive to operation of a switch or proximity detector to transmit the indication, wherein the mobile terminal is connected to the mobile station when the mobile terminal is connected to the mobile station. 2. The cellular wireless communication system according to claim 1, including the switch or the proximity detector operated. 3. The cellular wireless communication system according to claim 1, wherein the connection unit includes a wireless communication transmitter / receiver for communication using the mobile terminal. 4. The cellular wireless communication system according to claim 1, wherein said connector includes means for storing said code readable by said mobile terminal responding to said code to transmit said indication. 5. The cellular wireless communication system according to claim 4, wherein the transmitted indication is the code. 6. The connector includes a processor operable to encode word data received from the mobile terminal and send the encoded word back to the terminal; 4. The cellular wireless communication system according to claim 1 or 3, wherein a similar encoding is performed and the indication is transmitted to the base station only when the two encoded words are identical. 7. The base station includes a plurality of antennas each having a respective one of the tapped delay line space / time processors to which the output signals of the taps are weighted and added in a space / time processor. The cellular wireless communication system of any of the preceding claims, wherein the weight is determined to direct a lobe to a known location on the fixed device immediately after receiving the indication. 8. During a call in which the base station receives the indication,
The cellular wireless communication system of any of the preceding claims, including the toll center for reducing toll rates. 9. The cellular network of any preceding claim, including means for responding to receiving the indication in an adjacent cell to reuse the channel with which the mobile terminal is communicating. Wireless communication system.