Method and apparatus for reducing latency in waking up a group of dormant communication devices

• US 20020173325A1
• Filed: 12/04/2001
• Published: 11/21/2002
• Est. Priority Date: 05/15/2001
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Maggenti, Mark, Rosen, Eric
• Granted Patent: US 6,725,053 B2
• Time in Patent Office: Days
• US Class Current: 455/518
• CPC Class Codes: H04M 2203/2044 Group features, e.g. closed user group
• CPC Class Codes: H04M 3/42 Systems providing special services or facilities to subscribers specially adapted for wireless communication networks H04W4/00
• CPC Class Codes: H04M 3/42382 Text-based messaging services in telephone networks such as PSTN/ISDN, e.g. User-to-User Signalling or Short Message Service for fixed networks
• CPC Class Codes: H04M 3/56 Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities video conference systems H04N7/15
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 4/10 Push-to-Talk [PTT] or Push-On-Call services
• CPC Class Codes: H04W 52/0219 where the power saving management affects multiple terminals
• CPC Class Codes: H04W 52/0254 detecting a user operation or a tactile contact or a motion of the device
• CPC Class Codes: H04W 76/10 Connection setup
• CPC Class Codes: H04W 76/45 for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and apparatus for reducing dormant-wakeup latency in a group communication network provides for a significant reduction in the actual total dormant-wakeup time and the PTT latency perceived by the talker through caching the network-initiated wakeup triggers destined for target listeners, and delivering a wakeup trigger to a target mobile station as soon as the target mobile station has re-established its traffic channel.

Claims

1. A method for reducing latency in a group communication network, the method comprising:

receiving a dormant-wakeup trigger directed to a target communication device;

triggering the target communication device to re-establish its traffic channel; and

storing the dormant-wakeup trigger for later transmission to the target communication device.

2. The method of claim 1, further including:

transmitting the stored dormant-wakeup trigger to the target mobile as soon as the target mobile has re-established a traffic channel.

6. The apparatus of claim 1, further including:

means for transmitting the stored dormant-wakeup trigger to the target mobile as soon as the target mobile has re-established a traffic channel.

3. A computer-readable medium embodying a method for reducing latency in a group communication network, the method comprising:

receiving a dormant-wakeup trigger directed to a target communication device;

triggering the target communication device to re-establish its traffic channel; and

storing the dormant-wakeup trigger for later transmission to the target communication device.

4. The computer-readable medium of claim 3, wherein the method further includes:

transmitting the stored dormant-wakeup trigger to the target mobile as soon as the target mobile has re-established a traffic channel.

5. An apparatus for reducing latency in a group communication network, comprising:

means for receiving a dormant-wakeup trigger directed to a target communication device;

means for triggering the target communication device to re-establish its traffic channel; and

means for storing the dormant-wakeup trigger for later transmission to the target communication device.

7. An apparatus for reducing latency in a group communication network, the communication device comprising:

a memory unit;

a receiver;

a transmitter; and

a processor communicatively coupled to the memory unit, the receiver, and the transmitter, the processor being capable of;

receiving a dormant-wakeup trigger directed to a target communication device;

triggering the target communication device to re-establish its traffic channel; and

storing the dormant-wakeup trigger for later transmission to the target communication device.

8. The apparatus of claim 7, wherein the processor is further capable of:

transmitting the stored dormant-wakeup trigger to the target mobile as soon as the target mobile has re-established a traffic channel.