Patent EP0443503A2 successfully refreshed from Google Patents.
EP0443503A2
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Mobile communication system
Assignee: Mitsubishi Electric Corp
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Filing: 1991-02-19
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Granted: —
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Expires: 2011-02-19
Abstract
Abstract A mobile communication system comprises a switching station, base stations to constitute respective zones, and mobile stations moving in a service zone formed by the communication zones. Plural base stations exist in one communication zone, and one specific channel among control communication channels is allocated to one of the base stations. The mobile station transmits general communication request using one specific channel during request of the general communication. Or the control communication channel is allocated only to one station among the base stations. The mobile station has a circuit for measuring the signal-to-noise ratio, and if the signal-to-noise ratio is deteriorated, a signal indicating this state is transmitted to the switching station.
Inventors
- 👤 Takeshi C/O Mitsubishi Denki K. K. Monma
- 👤 Yasushi C/O Mitsubishi Denki K. K. Ozu
- 👤 Mitsuo C/O Mitsubishi Denki K. K. Fujyu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 14:18
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/08; H04W36/083; H04W36/24; H04W36/30; H04W36/302
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
272 words
A mobile communication system comprising: a switching station; a plurality of base stations connected to said switching station; a plurality of mobile stations moving in a service area formed by combination of communication zones constituted by said base stations; and said base station and said mobile station having a speech radio channel for speech and a control radio channel for communication of communication control signals, said speech radio channel and said control radio channel being constituted by an upward channel from the mobile station to the base station and a downward channel from the base station to the mobile station respectively, wherein the plurality of base stations are installed within each communication zone and the radio channel to be used for the specific case only is allocated to one station among the base stations within the communication zone and said base station is made the normally receiving state, and if said base station receives the general communication request signal at the upward channel of the radio channel to be used for the specific case only from the mobile station within said communication zone, said switching station commands the general communication to the prescribed base station in accordance with the information included in the general communication request signal, and the base station receiving the command of the general communication transmits the general communication signal to the prescribed signal to the prescribed mobile station using the control radio channel to be used for the ordinary communication control in the case of not using the communication radio channel and using the communication radio channel in use in the case of using the communication radio channel.
Claim 2
Dependent Claim
75 words
A mobile communication system as set forth in claim 1, wherein the mobile station to request the general communication transmits a base station identification code allocated to the communication zone in which said mobile station exists at present together with a general communication request code, and each base station within the service area transmits the base station identification code allocated to the communication zone constituted by the base station together with the general communication zone.
Claim 3
Dependent Claim
94 words
A mobile communication system as set forth in claim 1, wherein each mobile station within the service area is previously divided into groups and a group identification code is allocated to each group, and the mobile station to request the general communication transmits a group identification code of the group as the object of the general communication together with a general communication request code, and each base station within the service area transmits the group identification code of the group as the object of the general communication together with the general communication request code.
Claim 4
Dependent Claim
75 words
A mobile communication system as set forth in claim 1, wherein a mobile station to request the general communication transmits a base station group identification code indicating the communication zone as the object of the general communication together with a general communication request code, and only each base station within the base station group corresponding to the base station group identification code among the base stations within the service area transmits the general communication signal.
Claim 5
Dependent Claim
211 words
A mobile communication system comprising: a switching station; a base station group constituted by a plurality of base stations connected to said switching station; a plurality of mobile stations moving in a service area formed by combination of communication zones constituted by said base station group; and said base station and said mobile station having a speech radio channel for speech and a control radio channel for communication of communication control signals, said speech radio channel and said control radio channel being constituted by an upward channel from the mobile station to the base station and a downward channel from the base station to the mobile station respectively, wherein allowance of bi-directional communication by both upward and downward channels of the control radio channel and allowance of newly starting the bi-directional speech by both upward and downward channels of the speech radio channel are supplied to one station at most regarding one control radio channel among the plurality of base stations within the communication zone, and the base station supplied with allowance of bi-directional communication by both channels of the control radio channel and allowance of starting the bi-directional speech by both channels of the speech radio channel is changed in sequence between the base stations within the same communication zone.
Claim 6
Dependent Claim
54 words
A mobile communication system as set forth in claim 5, wherein a base station group identification code is allocated to each base station group, and each mobile station and a base station as its communication destination use the base station group identification code of the group to which the base station belongs during communication.
Claim 7
Dependent Claim
52 words
A mobile communication system as set forth in claim 6, wherein the mobile station stores a base station group identification code received from the base station, and transmits a position registration signal only when the newly received base station group identification code is different from the stored base station group identification code.
Claim 8
Dependent Claim
34 words
A mobile communication system as set forth in claim 6, wherein a position display device for indicating the registration position of each mobile station within the service area is installed in the switching station.
Claim 9
Dependent Claim
229 words
A mobile communication system comprising: a switching station; a plurality of base stations connected to said switching station; a plurality of mobile stations moving in a service area formed by combination of communication zones constituted by said base stations; said base station and said mobile station having a speech radio channel for speech and a control radio channel for communication of communication control signals, said speech radio channel and said control radio channel being constituted by an upward channel from the mobile station to the base station and a downward channel from the base station to the mobile station respectively; and each of said base stations having function of measuring signal-to-noise ratio of received signals so as to change the speech radio channel of the base stations moving over the plurality of communication zones based on the measured value, wherein each of said movable stations has function of measuring signal-to-noise ratio of received signals and always measures the signal-to-noise ratio of the speech radio channel during speech, and if deterioration of the measured value is detected, speech on the speech radio channel is interrupted and transferred to communication by the control radio channel, and a speech continuing request signal is transmitted and one of the base stations receiving the speech continuing request signal transmits a mobile station call signal to the mobile station transmitting the speech continuing request signal.
Claim 10
Dependent Claim
76 words
A mobile communication system as set forth in claim 9, wherein each base station receiving a speech continuing request signal measures signal-to-noise ratio of the received signal, and the switching station supplies a base station selecting signal to one of the base stations corresponding to the signal-to-noise ratio values beyond the reference value among values measured by each base station, and the base station receiving the base station selecting signal transmits a mobile station receiving signal.
Claim 11
Dependent Claim
67 words
A mobile communication system as set forth in claim 9, wherein each base station receiving a speech continuing request signal transmits a continuing receiving signal to the switching station, and the switching station supplies a base station selecting signal to the base station corresponding to the continuing receiving signal first received and the base station receiving the base station selecting signal transmits a mobile station receiving signal.
Claim 12
Dependent Claim
70 words
A mobile communication system as set forth in claim 9, wherein each base station receiving a speech continuing request signal measures signal-to-noise ratio of the received signal, and the switching station supplies a base station selecting signal to the base station corresponding to the maximum signal-to-noise value among values measured by each base station, and the base station receiving the base station selecting signal transmits a mobile station receiving signal.
Claim 13
Dependent Claim
66 words
A mobile communication system as set forth in claim 10, wherein a mobile station receiving a mobile station receiving signal transmits a connection confirmation signal, and if a connection confirmation response signal is not received within the prescribed time from the base station, a radio channel to be used for speech is returned to a speech radio channel used before transmitting the speech continuing request signal.
References Cited (Backward Citations)
No citation records indexed.
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