Efficient paging system with sleep mode duration determined by the guaranteed number of repeats
First Claim
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1. A method for saving battery power in a portable telephone for use in a radio communication system having battery-saving sleep modes, comprising the steps of:
- repeating transmissions of calling messages from a base station to the portable telephone a guaranteed number of times;
operating the portable telephone in a first low-power sleep mode during periods of normal expected use;
waking the portable telephone in said first sleep mode at regular intervals to receive signals from the communication system;
operating the portable telephone in a second lower-power sleep mode during periods of low expected use; and
waking the portable telephone in said second sleep mode less frequently than in said first sleep mode and in relation to the guaranteed number of times transmissions of calling messages are repeated in said step of repeating.
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Abstract
A method for efficiently paging a mobile phone in a radio communication system having a plurality of mobile phones is disclosed. A first paging signal is transmitted for a mobile phone on a first try channel. If the mobile phone does not acknowledge the first paging signal within a predetermined period of time, the call is transferred to at least a second try channel. A second paging signal is then transmitted for the first mobile phone on at least the second channel.
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Citations
28 Claims
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1. A method for saving battery power in a portable telephone for use in a radio communication system having battery-saving sleep modes, comprising the steps of:
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repeating transmissions of calling messages from a base station to the portable telephone a guaranteed number of times; operating the portable telephone in a first low-power sleep mode during periods of normal expected use; waking the portable telephone in said first sleep mode at regular intervals to receive signals from the communication system; operating the portable telephone in a second lower-power sleep mode during periods of low expected use; and waking the portable telephone in said second sleep mode less frequently than in said first sleep mode and in relation to the guaranteed number of times transmissions of calling messages are repeated in said step of repeating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A communications system for paging mobile phones comprising:
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means for monitoring activity of each mobile phone in the system by computing an associated cumulative activity value; means for increasing said cumulative activity value whenever a call is placed or received from the associated phone; means for gradually decreasing said cumulative activity value whenever the associated phone is not being used for conversation; and means for transmitting paging messages to mobile phones using, for each phone called, a guaranteed number of repeat transmissions depending on the mobile phone'"'"'s associated cumulative activity value. - View Dependent Claims (10, 11, 12)
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13. A mobile radio telephone system comprising at least one base station transmitting information to portable telephones indicating whether a portable telephone is being called, comprising:
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means for dividing a repetitive frame period into a number of communication slots; means for determining the communication slot to be used for transmitting a call to a portable telephone based on the portable telephone'"'"'s telephone number or ID; means for transmitting a calling message in said determined communication slot indicative of the portable telephone being called; means for repeating transmission of said calling message a number of times as determined by system loading and available capacity to transmit such calls; and means for transmitting an indication of a current guaranteed number of calling message repeats; wherein said portable telephone uses said indication of a current guaranteed number of calling message repeats to determine the length of the sleep mode to enter. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for paging a mobile phone in a radiotelephone system having a plurality of mobile phones wherein said mobile phones are in a reduced power sleep mode when they are idle, comprising the steps of:
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waking up at assigned intervals to receive data which is broadcast on an assigned first try sleep mode time slot; decoding said received data; adopting a low power sleep mode until next assigned first try sleep mode time slot when correctly decoded data is for another mobile phone; and waking up to receive data broadcast on a second try time slot when said first data is not correctly decoded, wherein data broadcast on said second try time slot are broadcasted using at least one of a) an increased amount of error correction coding, b) a higher broadcast power level and c) a wider broadcast area as compared to data broadcast on said first try time slot. - View Dependent Claims (20, 21, 22)
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23. A portable wireless telephone having an idle mode and a reduced power idle mode to conserve power, comprising:
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receiver/decoder means to receive and decode paging messages broadcast using a guaranteed number of message repetitions by a mobile phone system in a repetitive paging timeslot assigned to a group of mobile phones and also to identify said guaranteed number; and control unit means connected to said receiver/decoder means responsive to said guaranteed number and to said decoded paging messages to place said receiver/decoder circuits in a low power condition according to a first or second idle-mode schedule. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification