Combined analog and digital cellular telephone system having a secondary set of control channels
First Claim
1. A method for operating a mobile station to establish communication connections over control channels between a mobile station and a land system designed for digital traffic channels only, comprising the steps of:
- scanning a primary set of control channels in order to select a first channel generated from a first preferred transmission system;
reading said first channel of said primary set of control channels;
detecting a set of indicating bits associated with said first channel;
determining whether said indicating bits are in an active state or an inactive state, said active state indicating that said first preferred transmission system has digital communication capabilities, said inactive state indicating that said first preferred transmission system has only analog communication capabilities;
utilizing said primary control channels in response to said indicating bits being in an active state; and
initiating a scanning of any secondary set of control channels generated from a second preferred transmission system in response to said indicating bits being in an inactive state.
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Accused Products
Abstract
A method and apparatus for directing mobile stations in a cellular mobile radio system to different sets of control channels, depending on whether the land system and the mobile stations have digital capabilities. The mobile stations operate to initially scan the same primary set of control channels and to read one of them, and to make a determination, based on the value of certain bits transmitted over the control channel and also the digital capabilities of the type of mobile station involved, whether to continue operation on the primary set of control channels, or whether to scan and read any secondary set of control channels. If a mobile station with digital capabilities decides to scan the secondary set of control channels, but does not find such channels, the mobile station determines that there are no secondary sets of control channels. In this case, if the mobile has analog capabilities, the mobile station will return to scanning the primary set of control channels.
207 Citations
45 Claims
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1. A method for operating a mobile station to establish communication connections over control channels between a mobile station and a land system designed for digital traffic channels only, comprising the steps of:
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scanning a primary set of control channels in order to select a first channel generated from a first preferred transmission system; reading said first channel of said primary set of control channels; detecting a set of indicating bits associated with said first channel; determining whether said indicating bits are in an active state or an inactive state, said active state indicating that said first preferred transmission system has digital communication capabilities, said inactive state indicating that said first preferred transmission system has only analog communication capabilities; utilizing said primary control channels in response to said indicating bits being in an active state; and initiating a scanning of any secondary set of control channels generated from a second preferred transmission system in response to said indicating bits being in an inactive state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A mobile cellular radio telephone system including a mobile station and a base station designed for digital traffic channels only or digital and analog traffic channels, comprising:
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scanning means for scanning a primary set of control channels in order to select a first channel from a first preferred transmission system; reading means for reading said first channel of said primary set of control channels; detecting means for detecting a set of indicating bits associated with said first channel which indicate whether said first preferred transmission system has digital communication capabilities; utilizing means for utilizing said primary control channels in response to said indicating bits indicating that said first preferred transmission system has digital communication capabilities; and initiating means for initiating a scanning by said scanning means of any secondary set of control channels generated from a second preferred transmission system in response to said indicating bits indicating that said first preferred transmission system does not have digital communication capabilities. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for providing communication channels of a first data communication type in an existing cellular telephone system having communication channels of a second data communication type, said existing cellular telephone system including a mobile station and base station designed for utilizing communication channels of said first data communication type only or communication channels of said first and second data communication type, comprising the steps of:
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scanning a set of primary control channels for a first channel generated from a first preferred communication system having communication capabilities of said second data communication type; reading a first message from said first channel of said primary control channels; detecting a set of indicating bits associated with said first message which indicate whether said first preferred communication system has communication capabilities of said first data communication type or said second data communication type; determining in accordance with said indicating bits whether said first preferred communication system has communication capabilities of said first data communication type or said second data communication type; utilizing said primary control channels in response to said indicating bits indicating that said first preferred communication system has communication capabilities of said first data communication type; and initiating a scanning of a set of secondary control channels generated from a second preferred communication system in response to said indicating bits indicating that said first preferred communication system does not have communication capabilities of said first data communication type. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A mobile cellular radio telephone system comprising:
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a first preferred transmission system which generates a primary set of control channels; a second preferred transmission system which generates a secondary set of control channels; means in said first preferred transmission system for transmitting a first message on said primary control channels, said first message having associated therewith a set of indicating bits which indicate whether said first preferred transmission system has digital communication capabilities; and a mobile station including means operable for initially scanning said primary control channels and reading said first message from said primary control channels;
whereinsaid a mobile station includes means for utilizing said primary control channels in response to said indicating bits indicating that said first preferred transmission system has digital communication capabilities, and for scanning said secondary control channels in response to said indicating bits indicating that said first preferred transmission system does not have digital communication capabilities. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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39. A method for establishing a communication connection between a mobile station and a base station in a mobile cellular telephone system, comprising the steps of:
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transmitting on primary set of control channels associated with a first preferred transmission system; transmitting on a secondary set of control channels associated with a second preferred transmission system; transmitting a first message on said primary control channels, said first message having associated therewith a set of indicating bits which indicate whether said first preferred transmission system has digital communication capabilities; scanning said primary control channels and reading said first message from said primary control channels; utilizing said primary control channels in response to said indicating bits indicating that said first preferred transmission system has digital communication capabilities; and scanning said secondary control channels in response to said indicating bits indicating that said first preferred transmission system does not have digital communication capabilities. - View Dependent Claims (40, 41, 42, 43, 44, 45)
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Specification