JPS6121629A - Switching device of high sensitivity reception antenna - Google Patents

Abstract

PURPOSE:To eliminate Handoff in a base station by connecting each talking receiver to plural reception antennas provided to cover all the area of the base station. CONSTITUTION:When a mobile equipment 4 existing in a service area 7a moves from a service area 7a to a 7b, a readio wave f1 from the mobile equipment 4 is received by reception antennas 1a, 1b and the reception level of the f1 is measured by scanning receivers 8a-8b. A control section 9 compares the reception levels in the frequency f1 measured by the scanning receivers 8a, 8b and selects a higher level. The result of comparison is transmitted to an antenna switching device 10-1 and an antenna having a higher reception level is connected to a receiver 3-1 having a talking frequency f1.

Description

DETAILED DESCRIPTION OF THE INVENTION C. Technical Field of the Invention The present invention relates to a reception antenna switching device that increases reception sensitivity at a base station when a mobile phone with a low transmission output is used, for example, in car phone communications.

[Prior art] A conventional device of this type is shown in FIG.

In the figure, (la) to (1c) are provided in the base station,
High-sensitivity directional receiving antennas installed to cover the service area, (2a) to (2c) are distributors that distribute radio waves received by the respective receiving antennas (1a) to (1c), and (3a - 1) ~(3a-n),
(3b-1) ~ (3b-n), (3cm1) ~ (3a
-n) l'i Call receivers connected to these distributors (2a) to (2c), (4) are mobile telephones mounted on cars etc. (hereinafter referred to as mobile devices), ( 5) is a base station,
(7) is the service area of each receiving antenna (1a) to (1c).

Next, the operation will be explained. The radio wave fl from the mobile device (4) existing in the service area (7a) of the communication antenna (1a) is received by the receiving antenna (1a) and sent to the distributor (2).
a) A telephone receiver (3a-
1).

Here, if this mobile device (5) moves from the Chivis area (7a) to (7b), it will be outside the service area of the antenna (1a), so the control frame in the base station (5) will
Perform andoff (tracking switching) and change the receiving antenna (
lb) and change the communication frequency from fal to f.
Make a call using the call receiver (3b-1).

Since the conventional call connection system is configured as described above, when the mobile device (4) moves to the service area of another antenna, Handoff is performed even if the mobile device (4) is within the service of the same base station (5). It is necessary to switch frequencies, and when the mobile device (4) moves within the service area of the base station (5), it is necessary to perform handoff many times. In addition, the number of communication frequencies allocated to the base station (5) is limited due to the relationship with other base stations, and if it is further divided for each antenna, the number of frequencies actually used within the base station (5) is limited. Frequency is wasted.

[Summary of the Invention] This invention provides the above-mentioned Handoff at the same base station.
This was done in order to effectively utilize the same wave number, and each telephone receiver was designed to be able to connect to multiple receiving antennas to cover all of its base stations. - To provide a receiving antenna switching device that eliminates the need for handoff at a base station and allows the frequency assigned to a base station to be used in the service areas of all antennas.

[Collection of invention examples]

An embodiment of the present invention will be described below with reference to FIG.

In the figure, symbols (1) to (7) correspond to conventional ones. (8) (8a) to (8b) are through-scan receivers that are provided for each receiving antenna (1a) to (lc) and sequentially measure the reception level of each frequency received by that antenna. This scan receiver (
The reception level of each frequency measured in 8) is determined by the control unit (9).
are compared.

By controlling the anti & switching unit (io) from this control unit (9), the antenna (1) with the highest reception level for each frequency is selected, and the received signal is sent to the distributor (2).
is connected to the telephone receiver (3).

This high-sensitivity receiving antenna switching device is configured as described above, and when the mobile device (4) existing in the service area (7a) moves from the service area (7a) to the service area (7b), the radio wave fl from the mobile device (4) is is received by receiving antennas (1a) and (1b), and the reception level of fl is measured by scan 5Th(i[(8a) to (8b)) connected to each antenna.

The control unit (9) controls this scan receiver (8a) (sb)
Compare the reception levels of frequency &fx measured by , and select the one with the higher level. The results of this comparison are transferred to the antenna switcher (
10-1) and the antenna with a high reception level is connected to the receiver (3-1) of the communication frequency f1.

Since the scan receivers (8a) to (8c) sequentially measure the levels of all receiving stations gl WKf 1 Receiver (1
0-1) to (10-n).

In the above embodiment, a method was shown in which the reception levels of all reception antennas were compared at once, but as shown in FIG.
Divide into 2 groups and receive further pels from the strongest antenna selected in each group (3)
You can also select an antenna with a strong reception level using the switch (ll) installed inside. In addition, in Figure 3 (1)
-(10) correspond to the above-mentioned symbols, and (11) is a switch in the receiver.

[Effects of the Invention] As described above, according to the present invention, the telephone receiver can be connected to all high-sensitivity receiving antennas, so within the service area of the same base station, the mobile device cannot access the service area of any receiving antenna. Hand.

All frequencies allocated to the base station can be used within the base station area without the need for frequency switching by ff.

[Brief explanation of the drawing]

FIG. 1 is a connection diagram showing a conventional high-sensitivity receiving system, FIG. 2 is a connection diagram showing a configuration according to an embodiment of the present invention, and FIG. 3 is a connection diagram showing an embodiment of the same in FIG. . In the figure, (1a) to (1d) are high-sensitivity directional antennas, (2a) to (2d) are distributors, and (a-i) to
(3-n) is a telephone receiver, (4) is a mobile device, (8a)
~(8d) is a scan receiver, (9) is a control unit, (1
0) is an antenna switch. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] Multiple directional receiving antennas installed to cover all areas of the base station, a distributor that distributes the radio waves received by each antenna to multiple call receivers, and a connection to each of the above receiving antennas. A scan receiver that sequentially measures the reception level of each communication frequency received by each antenna for each frequency, a control unit that compares the levels obtained by this scan receiver for each frequency, and this control unit. A high-sensitivity receiving antenna switching device comprising an antenna switching device that selectively connects one of the plurality of receiving antennas to each telephone receiver under control of the above.