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Method of using location information for interference protection
| Details |
Inventors: Steer, David G.;
Assignee: Nortel Networks Limited (St. Laurent, CA)
Primary Examiner: Vo; Nguyen T.
Assistant Examiner:
Attorney, Agent or Firm:
A problem with mobile radio systems is the potentially harmful interference they may cause to other electronic equipment. Such interference can be dangerous and even life-threatening in hospitals and aircraft. The present invention provides a method to protect against improper operation of mobile radios, e.g. cellular phones, by making use of a "location technique" and knowledge of the mobile's location to determine if the mobile is inside a protected region and thus needs to constrain its operation. Two modes of operation are possible: one utilising a location technique that is part of the mobile radio system, and the second utilising a location service that is independent of the mobile radio system (such as the satellite based GPS system). The present invention includes control of operation, such as no audible ringing, or outgoing calls only, as well as possible control of transmitter power to protect against interference. This allows for the safe operation of mobile radios in regions where interference could cause serious problems and also provides a method for maintaining social etiquette. Protected region boundaries and conditions of restricted operation are broadcast by base stations on the broadcast control channels. If the location of a mobile is determined to be within a protected region defined by the broadcast message, its operation is limited to the conditions specified. |
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DETAILED DESCRIPTION Because it is impossible to prevent people from operating mobile radio equipment (e.
g.
cellular phones or radio fax modems in portable computers) in sensitive areas, the present invention provides an arrangement whereby they can be operated safely in these areas, or the mobile radio can be disabled if the area cannot tolerate any level of mobile emissions.
The present invention provides a new technique for controlling the operation of mobile radios in protected regions by making use of the new "location finding" service capability of the mobile network.
It also proposes using broadcast control signals to indicate the type of mobile radio operation (e.
g.
no audible ringing or outgoing calls only) permitted in the restricted region.
The present invention operates in the following way: (a) A base station with coverage in the sensitive area is installed and operated at a power level such as to be below the level of susceptibility of the sensitive equipment in the area.
This base station may be an existing installed base station with suitable coverage and power level.
(b) The base station providing coverage in the sensitive area transmits information on protected region boundaries and conditions of restricted operation (using the mobile radio system broadcast control channels and the signalling mechanisms in the air interface standard).
(c) The mobile radio operation is controlled such that, before it makes any transmissions, it receives and interprets the local broadcast control channels.
(d) The mobile radio makes use of a suitable "location finding" technique to determine its location.
(e) The mobile radio compares its measured location to the protected region boundaries to determine whether or not it is inside a protected region and thus, needs to constrain its operation.
(f) If the mobile radio is within a protected region, it constrains its operation according to the conditions broadcast for that protected region (e.
g.
low power operation or no audible ringing).
(g) If the mobile radio is not within a protected region, then it operates in the normal (unconstrained) manner
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