Efficient paging in a wireless communication system
First Claim
1. A method of paging a wireless terminal in a communications system including multiple wireless terminals, the method comprising:
- modulating, using a first type of modulation, a first number of bits of information to generate a first paging signal, said first paging signal conveying said first number of bits of information, said first paging signal including information indicating if there is a paging message;
modulating, using a second type of modulation, a second number of bits of information to generate a second paging signal, said second type of modulation being different from said first type of modulation, said second paging signal including, when there is a paging message, at least a portion of said paging message when said first paging signal indicates that there is a paging message;
transmitting said first paging signal; and
transmitting said second paging signal.
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Accused Products
Abstract
Methods and apparatus for efficient two-stage paging wireless communications systems are described. Wireless terminals are assigned to paging groups. A few first paging message information bits are modulated (using non-coherent modulation) into a first paging signal and communicated from a base station to wireless terminals. WTs wake-up, receive the first paging signal and quickly ascertain whether its paging group should expect a second paging signal, if so, the WT is operated to receive the second paging signal; otherwise, the WT goes back to sleep conserving power. The base station modulates (using coherent modulation) a number of second message information bits into a second paging signal and transmits the signal to WTs. From the information in first and second paging signals, a WT can determine that it is the paged WT and process the paging instructions. The intended paged WT can transmit an acknowledgement signal on a dedicated uplink resource.
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Citations
40 Claims
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1. A method of paging a wireless terminal in a communications system including multiple wireless terminals, the method comprising:
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modulating, using a first type of modulation, a first number of bits of information to generate a first paging signal, said first paging signal conveying said first number of bits of information, said first paging signal including information indicating if there is a paging message;
modulating, using a second type of modulation, a second number of bits of information to generate a second paging signal, said second type of modulation being different from said first type of modulation, said second paging signal including, when there is a paging message, at least a portion of said paging message when said first paging signal indicates that there is a paging message;
transmitting said first paging signal; and
transmitting said second paging signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A base station for communicating with wireless terminals, said base station including:
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first paging signal type generation means for periodically generating paging signals of a first type using a non-coherent modulation method, said paging signals of a first type indicating whether a paging message will be transmitted to at least one wireless terminal in a group of wireless terminals;
means for generating a paging signal of a second type using a coherent modulation method, said type signal including at least a portion of a paging message; and
means for transmitting said first and second type paging signals. - View Dependent Claims (22, 23, 24)
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25. A method of operating a wireless terminal, the method comprising:
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awaking from a sleep mode of operation to receive a first paging signal;
performing a non-coherent demodulation operation on said first paging signal to produce demodulated information;
determining if said demodulated information indicates that a paging message was transmitted; and
if it is determined that said demodulated information indicates that a paging message was transmitted, performing a coherent demodulation operation on a second paging signal. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A wireless terminal comprising:
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means for performing a non-coherent demodulation operation on a first paging signal to recover modulated information indicating whether a paging message corresponding to the first paging signal will be transmitted;
control means for controlling the wireless terminal to receive a second paging signal of a second type at a pre-selected time when information recovered from said first paging signal indicates a paging message corresponding to the first paging signal will be transmitted and for controlling the wireless terminal to enter a sleep mode of operation and remain in said sleep mode of operation until after said pre-selected time when said information recovered from said first paging signal indicates a paging message corresponding to the first paging signal will not be transmitted; and
means for performing a coherent demodulation operation on the received second paging signal to recover modulated information including at least a portion of a paging message. - View Dependent Claims (36, 37, 38, 39, 40)
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Specification