Radio communication system and method for analog and digital traffic channel allocation using a second higher threshold when allocating a digital channel
First Claim
1. A method for allocating a traffic channel to a mobile station at call set-up in a radiocommunication system having both analog traffic channels and digital traffic channels, the method comprising the steps of:
- measuring, at a base station, a signal strength received from said mobile station on a control channel;
determining if said measured signal strength exceeds a first threshold sufficient to permit communication between said base station and said mobile station;
if so, allocating a digital traffic channel to said mobile station if said measured signal strength exceeds a second threshold wherein said second threshold is higher than said first threshold; and
otherwise, allocating an analog traffic channel to said mobile station.
1 Assignment
0 Petitions
Accused Products
Abstract
The establishment of digital connections is avoided if the power level compensated uplink signal strength transmitted by a dual-mode mobile station is below a threshold value. In such cases, a dual-mode mobile station is instead preferably connected to an analog traffic channel. The threshold value can be selected to provide a statistically acceptable probability that the digital connection will be successful. Different threshold values can be used for different connection situations to take into account the different techniques used to determine a best serving base station.
50 Citations
20 Claims
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1. A method for allocating a traffic channel to a mobile station at call set-up in a radiocommunication system having both analog traffic channels and digital traffic channels, the method comprising the steps of:
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measuring, at a base station, a signal strength received from said mobile station on a control channel; determining if said measured signal strength exceeds a first threshold sufficient to permit communication between said base station and said mobile station; if so, allocating a digital traffic channel to said mobile station if said measured signal strength exceeds a second threshold wherein said second threshold is higher than said first threshold; and otherwise, allocating an analog traffic channel to said mobile station. - View Dependent Claims (2, 3, 4)
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5. A method for handing off a connection established between a mobile station and a currently serving base station on a current traffic channel to another traffic channel, the method comprising the steps of:
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measuring an uplink signal strength at which said mobile station is transmitting on said current traffic channel; determining if said measured uplink signal strength exceeds a first threshold; selecting a digital traffic channel as said another traffic channel if said measured uplink signal strength exceeds a second threshold greater than said first threshold; otherwise, selecting an analog traffic channel as said another traffic channel if said measured uplink signal strength fails to exceed said second threshold; and handing off said connection to said selected another traffic channel. - View Dependent Claims (6, 7, 8)
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9. A system for allocating a traffic channel to a mobile station at call set-up in a radiocommunication system having both analog traffic channels and digital traffic channels, the system comprising:
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means for measuring, at a base station, a signal strength received from said mobile station on a control channel; means for determining if said measured signal strength exceeds a first threshold sufficient to permit communication between said base station and said mobile station; means for allocating a digital traffic channel to said mobile station if said signal strength exceeds a second threshold greater than said first threshold; and means for allocating an analog traffic channel to said mobile station if said signal strength fails to exceed said second threshold. - View Dependent Claims (10, 11, 12)
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13. A system for handing off a connection established between a mobile station and a currently serving base station on a current traffic channel to another traffic channel, the system comprising:
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means for measuring an uplink signal strength at which said mobile station is transmitting on said current traffic channel; means for determining if said measured uplink signal strength exceeds a first threshold; means for selecting a digital traffic channel as said another traffic channel if said measured uplink signal strength exceeds a second threshold greater than said first threshold; means for selecting an analog traffic channel as said another traffic channel if said measured uplink signal strength fails to exceed said second threshold; and means for handing off said connection to said selected another traffic channel. - View Dependent Claims (14, 15, 16)
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17. A method for handing off a connection from an analog traffic channel comprising the steps of:
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providing a first signal strength threshold for evaluating handoffs from said analog traffic channel to another analog traffic channel; providing a second signal strength threshold for evaluating handoffs from said analog traffic channel to a digital traffic channel; and handing off said connection from said analog traffic channel to said digital traffic channel if a measured uplink signal strength exceeds said second signal strength threshold wherein said second threshold is higher than said first threshold. - View Dependent Claims (18)
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19. A method for handing off a connection from a first digital traffic channel to a second digital traffic channel comprising the steps of:
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measuring an uplink signal strength on said first digital traffic channel; determining if said measured uplink signal strength exceeds a first threshold; and handing off said connection to said second digital traffic channel if said measured uplink signal strength exceeds a second threshold greater than said first threshold. - View Dependent Claims (20)
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Specification