Dual channel slotted paging

• US 6,111,865 A
• Filed: 05/30/1997
• Issued: 08/29/2000
• Est. Priority Date: 05/30/1997
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gilhousen, Klein S., Butler, Brian K.
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): Vanderpuye, Kenneth
• Application Number:
  US08/865,650
• Time in Patent Office: 1,187 Days
• Field of Search: 435/31.2, 435/31.3, 435/38.1, 435/38.3, 435/575, 435/574, 435/343, 435/458, 370/311, 370/312, 370/320, 370/321, 370/328, 370/335, 370/336, 370/342, 370/365, 370/368, 340/825.44, 340/825.53
• US Class Current: 370/335
• CPC Class Codes: H04L 1/0017 where the mode-switching is based on Quality of Service requirement
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04W 48/12 using downlink control channel
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 68/025 Indirect paging
• CPC Class Codes: H04W 68/08 using multi-step notification by increasing the notification area
• CPC Class Codes: H04W 84/042 Public Land Mobile systems, e.g. cellular systems
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A novel and improved method and system for paging a cellular telephone or other wireless terminal using two paging channels that reduces standby mode power consumption described. In one embodiment of the invention, a minimally encoded quick paging channel is established over which short, quick page messages are transmitted during one of a set of quick paging slots. The quick page message indicates that a communications request has been received, and that the receiving communication terminals should process a highly encoded full paging channel over which more detailed, full page messages are transmitted during the next full paging slot. A terminal monitors full paging channel only after a quick page message has been received on the quick paging channel.

Claims

1. A method for paging a wireless terminal in a wireless telecommunications system comprising:

transmitting a quick page message via a less encoded channel, said quick page message notifying the wireless terminal to begin monitoring a highly encoded channel for a full page message; and

transmitting a full page message via said highly encoded channel;

said highly encoded channel comprising a series connected convolutional encoder, an interleaver, and a modulator for performing modulation with a Walsh code; and

said less encoded channel comprising a modulator for modulating data with a Walsh code.

2. The method as set forth in claim 1 wherein said quick page message contains less information than said full page message.

3. The method as set forth in claim 1 wherein said quick page message is comprised of a single bit of data.

4. A method for paging a particular wireless terminal included within a set of wireless terminals comprising:

a) transmitting a quick page message directed to a subset of said set of wireless terminals said subset including the particular wireless terminal, said quick page message for directing said subset to monitor a highly encoded channel for a full page message; and

b) transmitting a full page message identifying said particular wireless terminal;

said highly encoded channel comprising a series connected convolutional encoder, an interleaver, and a modulator for performing modulation with a Walsh code.

5. The method as set forth in claim 4 wherein step a) is comprised of the step of transmitting said quick page message via a less encoded channel during a first time slot assigned to the subset of wireless terminals, and said less encoded channel comprises a modulator for modulating data with a Walsh code.

6. The method as set forth in claim 5 wherein step b) is comprised of the step of transmitting said full page message during a second time slot assigned to the subset of wireless terminals that occurs after said first time slot.

7. The method as set forth in claim 4 wherein said quick page message is transmitted over a less encoded channel and said full page message is transmitted over said highly encoded channel.

8. The method as set forth in claim 7 wherein said less encoded channel is established via direct sequence modulation with a first channel code, and said highly encoded channel is established via direct sequence modulation with a second channel code.

9. The method as set forth in claim 4 wherein said quick page message has less information than said full page message.

10. A method for paging a wireless terminal comprising:

a) generating a quick page message;

b) transmitting said quick page message via a less encoded channel;

c) said quick page message causing said wireless terminal to monitor a highly encoded channel for a full page message;

d) generating a full page message; and

e) transmitting said full page message via said highly encoded channel;

said highly encoded channel comprising a series connected convolutional encoder, an interleaver, and a modulator for performing modulation with a Walsh code; and

said less encoded channel comprising a modulator for modulating data with a Walsh code.

11. The method as set forth in claim 10 further comprising the steps of:

direct sequence spreading said full page message; and

direct sequence spreading said quick page message.

12. The method as set forth in claim 10 further comprising the steps of:

adding error detection information to said full page message;

direct sequence spreading said full page message; and

direct sequence spreading said quick page message.

13. The method as set forth in claim 10 further comprising the steps of adding a time delay between when said quick page message is transmitted and when said full page message is transmitted.

14. The method as set forth in claim 10 further comprising the steps of:

receiving said quick page message;

activating signal processing circuitry; and

processing a full page message using said signal processing circuitry.

15. The method as set forth in claim 14 wherein said signal processing circuitry is comprised of a trellis decoding system.

16. The method as set forth in claim 14 wherein said signal processing circuitry is comprised of a deinterleaver.

17. The method as set forth in claim 14 wherein said signal processing circuitry is comprised of a cyclical redundancy check circuit.