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US 6,493,550 B1Granted
System proximity detection by mobile stations
AssigneeEricsson Inc.
InventorAlex Krister Raith
Life of this patent
Estimating the term…
Abstract
Proximity systems in conjunction with radiocommunication systems are described. Mobile stations include proximity detectors which recognize proximity signals transmitted by a proximity system. This recognition triggers a search, for example, for a private radiocommunication control channel. In this way, mobile stations have a mechanism which is independent of public radiocommunication cell characteristics for recognizing the presence of a private radiocommunication system.
Claims36
A mobile station comprising:
- a first receiver for receiving signals over an air interface within a range of frequencies,
- a second receiver operating concurrently with said first receiver for receiving a proximity signal indicating the presence of a radiocommunication system, said proximity signal not being within said range of frequencies;
- and
- a processor for processing said received signals and said received proximity signal, wherein receipt of said proximity signal triggers said processor to tune said first receiver to a control channel associated with said radiocommunication system.
1 more element
A fixed portion of a radiocommunication system comprising:
- a transceiver for transmitting and receiving radio signals over an air interface within a range of frequencies;
- and
- a device for transmitting a proximity signal not within said range of frequencies, said proximity signal indicating a presence of said fixed portion of said radio communicating system and including data which indicates at least one of a control channel number, a frequency associated with a control channel being transmitted by said transceiver, a private system identity (PSID) code associated with said fixed portion, a range of frequencies within which a control channel is transmitted by said transceiver, and a range of PSIDs.
A method for performing access control in a radiocommunication system comprising
- a) detecting, via a second receiver in a mobile station, a proximity signal indicating the presence of a radiocommunication system transmitting in a range of frequencies associated with said radio communication system, said proximity signal not being within said range of frequencies;
- b) in response to step a), tuning a first_receiver in said mobile station to at least one frequency within said range of frequencies to receive a communication signal from said radiocommunication system.
A mobile station comprising:
- a first receiver for receiving signals over an air interface within a range of frequencies,
- a second receiver operating concurrently with said first receiver for receiving a proximity signal not being within said range of frequencies and having no information modulated thereon, said proximity signal indicating the presence of a radiocommunication system;
- and
- a processor for processing said received signals and said received proximity signal, wherein receipt of said proximity signal triggers said processor to initiate a search by said first receiver for a control channel signal associated with said radiocommunication system.
1 more element
A fixed portion of a radiocommunication system comprising:
- a transceiver for transmitting and receiving radio signals over an air interface within a range of frequencies;
- and
- a device for transmitting a proximity signal not within said range of frequencies, said proximity signal indicating a presence of said fixed portion of said radio communicating system and including no information modulated thereon.
A method for performing access control in a radiocommunication system comprising:
- a) detecting, via a second receiver in a mobile station, a proximity signal having no information modulated thereon indicating the presence of a radiocommunication system transmitting in a range of frequencies associated with said radio communication system, said proximity signal not being within said range of frequencies;
- b) in response to step a), initiating a search by a first receiver in said mobile station within said range of frequencies for a control channel associated with said radiocommunication system.
A mobile station comprising:
- a first receiver for receiving signals over an air interface within a range of frequencies,
- a second receiver operating concurrently with said first receiver for receiving one or more proximity signals not being within said range of frequencies, said proximity signals indicating the presence of a radiocommunication system;
- a second transmitter operative to transmit information to said radiocommunication system on one or more frequencies not within said range of frequencies;
- and
- a processor for processing said received signals and said received proximity signals, wherein receipt of said proximity signals triggers said processor to transmit information to said radiocommunication system via said second transmitter, and to tune a first transmitter to a control channel within said range of frequencies, said control channel associated with said radiocommunication system.
2 more elements
A fixed portion of a radiocommunication system comprising:
- a first transceiver for transmitting and receiving radio signals over an air interface within a range of frequencies;
- and
- a second transceiver for transmitting a proximity signal not within said range of frequencies, said proximity signal indicating a presence of said fixed portion of said radio communicating system, and for receiving information transmitted by a mobile station not within said range of frequencies.
A method for performing access control in a radiocommunication system comprising:
- a) detecting, via a second receiver in a mobile station, a proximity signal indicating the presence of a radiocommunication system transmitting in a range of frequencies associated with said radio communication system, said proximity signal not being within said range of frequencies;
- b) in response to step a), tuning a first receiver in said mobile station to a control channel within said range of frequencies, said control channel associated with said radiocommunication system;
- and
- c) transmitting information to said radiocommunication system outside of said range of frequencies.
1 more element
Dependencies are inferred from the claim text.