Efficient paging in a wireless communication system
First Claim
1. A method of operating a wireless terminal, the method comprising:
- awaking from a sleep mode of operation to receive a first paging signal indicating if there is a paging message for at least one wireless terminal in a first group of wireless terminals, said first group being one of a plurality of wireless terminal groups, said first group including multiple wireless terminals, said wireless terminal being a member of said first group;
performing a first demodulation operation on said first paging signal to produce demodulated information;
determining if said demodulated information indicates that a paging message was transmitted to at least one member of the first group; and
if it is determined that said demodulated information indicates that a paging message was transmitted to at least one member of the first group;
i) performing a second demodulation operation on a second paging signal; and
ii) determining from information included in said second paging signal if the second paging signal includes at least a portion of a paging message directed to said wireless terminal.
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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
17 Claims
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1. 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 indicating if there is a paging message for at least one wireless terminal in a first group of wireless terminals, said first group being one of a plurality of wireless terminal groups, said first group including multiple wireless terminals, said wireless terminal being a member of said first group; performing a first demodulation operation on said first paging signal to produce demodulated information; determining if said demodulated information indicates that a paging message was transmitted to at least one member of the first group; and if it is determined that said demodulated information indicates that a paging message was transmitted to at least one member of the first group; i) performing a second demodulation operation on a second paging signal; and ii) determining from information included in said second paging signal if the second paging signal includes at least a portion of a paging message directed to said wireless terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless terminal comprising:
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means for performing a first demodulation operation on a first paging signal, said first paging signal indicating if there is a paging message for at least one wireless terminal in a first group of wireless terminals, said first group being one of a plurality of wireless terminal groups, said first group including multiple wireless terminals, said wireless terminal being a member of said first group, said first demodulation being performed to recover modulated information indicating whether a paging message directed to at least one member of the first group 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 second demodulation operation on the received second paging signal to recover modulated information including at least a portion of a paging message directed to said wireless terminal and sufficient information to identify an individual wireless terminal in the first group. - View Dependent Claims (9, 10, 11, 12)
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13. A wireless terminal comprising:
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a first demodulation module for performing a first demodulation operation on a first paging signal, said first paging signal indicating if there is a paging message for at least one wireless terminal in a first group of wireless terminals, said first group being one of a plurality of wireless terminal groups, said first group including multiple wireless terminals, said wireless terminal being a member of said first group, said first demodulation being performed to recover modulated information indicating whether a paging message directed to at least one member of the first group will be transmitted; a control module 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 a second demodulation module for performing a second demodulation operation on the received second paging signal to recover modulated information including at least a portion of a paging message directed to said wireless terminal and sufficient information to identify an individual wireless terminal in the first group. - View Dependent Claims (14, 15)
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16. A computer readable medium including machine executable instructions for use in a wireless terminal, said computer readable medium comprising:
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instructions for causing the wireless terminal to awake from a sleep mode of operation to receive a first paging signal indicating if there is a paging message for at least one wireless terminal in a first group of wireless terminals, said first group being one of a plurality of wireless terminal groups, said first group including multiple wireless terminals, said wireless terminal being a member of said first group; instructions for causing the wireless terminal to perform a first demodulation operation on said first paging signal to produce demodulated information; instructions for causing the wireless terminal to determine if said demodulated information indicates that a paging message was transmitted to at least one member of the first group; and instructions for causing the wireless terminal to; i) perform a second demodulation operation on a second paging signal if it is determined that said demodulated information indicates that a paging message was transmitted to at least one member of the first group; and ii) determine from information included in said second paging signal if the second paging signal includes at least a portion of a paging message directed to said wireless terminal. - View Dependent Claims (17)
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Specification