EFFICIENT PAGING IN A WIRELESS COMMUNICATION SYSTEM

• US 20100190514A1
• Filed: 03/31/2010
• Published: 07/29/2010
• Est. Priority Date: 06/10/2004
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Laroia, Rajiv, Li, Junyi, Rangan, Sundeep, Hande, Prashanth
• Granted Patent: US 8,712,448 B2
• Time in Patent Office: Days
• US Class Current: 455/458
• CPC Class Codes: H04W 68/025 Indirect paging
• CPC Class Codes: Y02D 30/70 in wireless communication networks

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.

Claims

1. A method of paging a wireless terminal in a communications system including multiple wireless terminals, the method comprising:

modulating, using a non-coherent 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 whether there is a paging message;

modulating, using a coherent type of modulation, a second number of bits of information to generate a second paging signal, said second paging signal including, when there is the paging message, at least a portion of said paging message where said first paging signal indicates that there is the paging message;

transmitting said first paging signal; and

transmitting said second paging signal.