System and method for increased battery saving during idle mode in a wireless communication system

• US 7,471,942 B2
• Filed: 05/18/2006
• Issued: 12/30/2008
• Est. Priority Date: 05/18/2006
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Subramanian, Vijay G., Bedekar, Anand S., Tzavidas, Stavros
• Primary Examiner(s): Nguyen; Lee
• Application Number:
  US11/436,242
• Publication Number:
  US 20070270118A1
• Time in Patent Office: 957 Days
• Field of Search: 4553431-3434, 455/574, 340 732- 735, 340/7.38, 370/311
• US Class Current: 455/343.2
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 68/00 User notification, e.g. alerting and paging, for incoming communication, change of service or the like
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and information processing system for wirelessly transmitting at least one of a downlink channel descriptor and an uplink channel descriptor for reception by at least one wireless device (104). The method comprises selecting at least one transmission time for transmitting a pointer that indicates a transmission time for a DCD and/or a UCD. The pointer is transmitted at a time between a first transmission and a second transmission of the at least one of downlink channel descriptor and uplink channel descriptor. The transmission time is selected to reduce a time interval for the at least one wireless device (104) to search for the at least one of the DCD and UCD. Also, a message that includes DCD information and/or UCD information associated with at least one neighboring cell can also be chosen to transmit at specifically chosen times to the at least one wireless device (104).

Claims

1. A method, with a wireless communication system, for wirelessly transmitting at least one of a downlink channel descriptor and an uplink channel descriptor for reception by at least one wireless device, the method comprising:

selecting at least one transmission time for transmitting, for reception by at least one wireless device, at least one of;

a pointer indicating a transmission time for at least one of a downlink channel descriptor and an uplink channel descriptor, wherein the pointer is transmitted at a time, between a first transmission and a second transmission of the at least one of downlink channel descriptor and uplink channel descriptor, selected to reduce a time interval for the at least one wireless device to search for the at least one of the downlink channel descriptor and uplink channel descriptor; and

a message including downlink channel descriptor information and uplink channel descriptor information associated with at least one neighboring cell, wherein the message is transmitted during the time between the first transmission and the second transmission of the at least one of downlink channel descriptor and uplink channel descriptor.

2. The method of claim 1, wherein the time between the first transmission and the second transmission of the at least one of downlink channel descriptor and uplink channel descriptor corresponds to a paging listening interval associated with a home paging group.

3. The method of claim 1, wherein the pointer is transmitted between the first transmission and the second transmission of the at least one of downlink channel descriptor and uplink channel descriptor, at substantially any of the following times:

a ⅓

point in time between the first transmission and the second transmission of the at least one of downlink channel descriptor and uplink channel descriptor;

a mid-point in time therebetween; and

a ⅔

point in time therebetween.

4. The method of claim 1, wherein the time between the first transmission and the second transmission of the at least one of downlink channel descriptor and uplink channel descriptor corresponds to a paging listening interval associated with at least one neighboring paging group.

5. The method of claim 1, wherein choosing specific transmission time of the message further comprises:

transmitting the message during a paging listening interval associated with a home paging group.

6. The method of claim 1, wherein the message is transmitted between the first transmission and the second transmission of the at least one of downlink channel descriptor and uplink channel descriptor, at substantially any of the following times:

a ⅓

point in time between the first transmission and the second transmission of the at least one of downlink channel descriptor and uplink channel descriptor;

a mid-point in time therebetween; and

a ⅔

point in time therebetween.

7. The method of claim 1, further comprising:

determining at least one of offset parameters and cycle parameters for at least one neighboring paging group.

8. The method of claim 7, wherein the determining further comprises:

receiving the at least one of offset parameters and cycle parameters from at least one of;

the at least one neighboring paging group; and

at least one wireless device transitioning from the at least one neighboring paging group.

9. A method, with a wireless device, for receiving at least one of a downlink channel descriptor and an uplink channel descriptor, the method comprising,

receiving a pointer indicating a transmission time of at least one of a downlink channel descriptor and an uplink channel descriptor;

ceasing to monitor for the at least one of the downlink channel descriptor and uplink channel descriptor in response to receiving the pointer;

determining if the transmission time for the least one of the downlink channel descriptor and the uplink channel descriptor has occurred;

monitoring, in response to the transmission time being determined to have occurred, for reception of the at least one of the downlink channel descriptor and the uplink channel descriptor;

determining, in response to receiving the at least one of the downlink channel descriptor and the uplink channel descriptor, a new time interval between transmissions of the at least one of the downlink channel descriptor and the uplink channel descriptor; and

receiving a message including at least one of a downlink channel descriptor and uplink channel descriptor information at a time of transmission of the at least one of the downlink channel descriptor and the uplink channel descriptor associated with a neighboring paging group.

10. A method, with a wireless device, for receiving at least one of a downlink channel descriptor and an uplink channel descriptor, the method comprising,

receiving a pointer indicating a transmission time of at least one of a downlink channel descriptor and an uplink channel descriptor;

ceasing to monitor for the at least one of the downlink channel descriptor and uplink channel descriptor in response to receiving the pointer;

determining if the transmission time for the least one of the downlink channel descriptor and the uplink channel descriptor has occurred;

monitoring, in response to the transmission time being determined to have occurred, for reception of the at least one of the downlink channel descriptor and the uplink channel descriptor;

determining, in response to receiving the at least one of the downlink channel descriptor and the uplink channel descriptor, a new time interval between transmissions of the at least one of the downlink channel descriptor and the uplink channel descriptor; and

entering into at least one neighboring cell;

determining, based on the channel descriptor and uplink channel descriptor information received in the message, that a location update function needs to be performed; and

performing the location update function in response to the determination.

11. An information processing system in a wireless communication system for wirelessly transmitting at least one of a downlink channel descriptor and an uplink channel descriptor for reception by at least one wireless device, the information processing system comprising:

at least one processing unit;

a memory communicatively coupled to the at least one processing unit; and

a transmitter communicatively coupled to the memory and the at least one processing unit, the transmitter for selecting at least one transmission time, whereupon the transmitter transmits, for reception by at least one wireless device, at least one of;

a pointer indicating a transmission time for at least one of a downlink channel descriptor and an uplink channel descriptor, wherein the pointer is transmitted at a time, between a first transmission and a second transmission of the at least one of downlink channel descriptor and uplink channel descriptor, selected to reduce a time interval for the at least one wireless device to search for the at least one of the downlink channel descriptor and uplink channel descriptor; and

a message including downlink channel descriptor information and uplink channel descriptor information associated with at least one neighboring cell, wherein the message is transmitted during the time between the first transmission and the second transmission of the at least one of downlink channel descriptor and uplink channel descriptor.

12. The information processing system of claim 11, wherein the transmitter transmits the pointer during a paging listening interval associated with a home paging group.

13. The information processing system of claim 11, wherein the transmitter transmits the pointer during a paging listening interval associated with at least one neighboring paging group.

14. The information processing system of claim 11, wherein the transmitter transmits the pointer between the first transmission and the second transmission of the at least one of downlink channel descriptor and uplink channel descriptor, at substantially any of the following times:

a ⅓

point in time between the first transmission and the second transmission of the at least one of downlink channel descriptor and uplink channel descriptor;

a mid-point in time therebetween; and

a ⅔

point in time therebetween.

15. The information processing system of claim 11, wherein the transmitter transmits the message during a paging listening interval associated with a home paging group.

16. The information processing system of claim 11, wherein the transmitter transmits the message during a paging listening interval associated with at least one neighboring paging group.

17. The information processing system of claim 11, wherein the transmitter transmits the message between the first transmission and the second transmission of the at least one of downlink channel descriptor and uplink channel descriptor, at substantially any of the following times:

a ⅓

point in time between the first transmission and the second transmission of the at least one of downlink channel descriptor and uplink channel descriptor;

a mid-point in time therebetween; and

a ⅔

point in time therebetween.

18. The information processing system of claim 11, further comprising:

a receiver for receiving at least one of offset parameters and cycle parameters associated with at least one neighboring paging group.

19. The information processing system of claim 11, wherein the receiver receives the at least one of offset parameters and cycle parameters from at least one of:

the at least one neighboring paging group; and

at least one wireless device transitioning from the at least one neighboring paging group.