EP0106400A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
System identification in communications systems
Assignee: Philips Electronics UK Ltd
•
Filing: 1983-10-04
•
Granted: —
•
Expires: 2003-10-04
Abstract
Abstract In communications systems, such as cordless telephone systems, in which synchronising signals are transmitted at predetermined intervals on a signalling channel by base stations to say portable, battery-powered receivers, the need to send separate station identification signals is avoided by the synchronising signals being transmitted from a base station in accordance with a predetermined signalling sequence, for example a pseudo-random sequence, and the receivers using the sequence as a base station identification signal.
Inventors
- 👤 Philip David White
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 22:49
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/72; H04M1/725; H04M1/727
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
A method of identifying a base station in a communications system which is sharing a signalling channel with a base station of at least one other communications system, each base station transmitting signal bursts at time intervals determined in accordance with a respective predetermined sequence, each signal burst transmitted including an indication of the time interval between the sending of the signal and a subsequent signal in the sequence, wherein a receiver determines its base station from the transmitted predetermined sequences and thereby synchronises itself with its associated base station.
Claim 2
Independent Claim
90 words
A method of identifying a base station in a communications system which is sharing a signalling channel with a base station of at least one other communications system, each base station transmitting signal bursts at time intervals determined in accordance with a respective predetermined sequence, each signal burst transmitted including an indication of the time interval between the sending of the signal and a subsequent signal in the sequence, wherein a receiver determines its base station from the transmitted predetermined sequences and thereby synchronises itself with its associated base station.
Claim 3
Dependent Claim
56 words
A method as claimed in Claim 1, characterised in that the receiver compares the actual time intervals between the reception of the signals with an internally stored predetermined sequence and determines whether it is synchronised with its base station on the basis of the matching achieved between the received signal sequence and the internally stored one.
Claim 4
Dependent Claim
47 words
A method as claimed in Claim 2, characterised in that the matching is done by ascertaining if the time interval between the occurrences of successive signals in the sequence as received corresponds to the time interval in the internally stored sequence for the "next-transmission" signal transmitted previously.
Claim 5
Dependent Claim
62 words
A method as claimed in Claim 1, 2 or 3, characterised in that at switch on of a receiver it remains fully energised until synchronised with its base station and then reverts to a standby mode between the receipt of one signal burst and the commencement of the next burst unless it has switched to another channel for the receipt of information.
Claim 6
Dependent Claim
101 words
A communications system for use with the method as claimed in Claim 1, characterised by a base station including a transmitter, means coupled to the transmitter for producing a synchronising signal burst including an indication of the time interval between the transmission of the signal and a subsequent signal to be transmitted and predetermined coding means for controlling the transmitter so that it transmits successive signal bursts at time intervals determined in accordance with the predetermined code, and a receiver having means for determining its base station from the transmitted predetermined sequences and means for synchronising itself to the base station.
Claim 7
Dependent Claim
29 words
A communications system as claimed in Claim 5, characterised in that the receiver contains a predetermined coding means coded in the same way as that in its base station.
References Cited (Backward Citations)
US4194153A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.