SYNCHRONIZATION FOR EXTENDING BATTERY LIFE

• US 20140098730A1
• Filed: 12/12/2013
• Published: 04/10/2014
• Est. Priority Date: 05/06/2002
• Status: Active Grant

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Goldberg, Steven Jeffrey, Terry, Stephen E.
• Granted Patent: US 9,730,158 B2
• Time in Patent Office: Days
• US Class Current: 370/311
• CPC Class Codes: H04B 1/1615 Switching on; Switching off, e.g. remotely battery saving circuits associated with selective call operation H04W52/00; details of power consumption reduction in a PLL, H03L7/0802, H03L7/14, H03L2207/08, H03L2207/18; muting amplifiers by gain control see H03G3/34
• CPC Class Codes: H04M 1/724 User interfaces specially adapted for cordless or mobile telephones
• CPC Class Codes: H04M 1/72403 with means for local support of applications that increase the functionality
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The present invention discloses a method and system for efficiently supporting data calls to WTRUs in systems that also support telephony. Various types of data is transmitted on a known schedule which is tightly synchronized to a predetermined time frame. The WTRUs synchronize their wake-up periods to search for data at times when data may or will actually be transmitted to them.

Claims

1. A method for use in a wireless transmit/receive unit (WTRU), the method comprising:

receiving, from a base station, a frame including a synchronization schedule, wherein the synchronization schedule indicates a first time period assigned to the WTRU for receiving data intended for the WTRU during the frame;

receiving the data intended for the WTRU during the first time period; and

operating in a quiescent state during a second time period in the frame on a condition that the second time period is not the first time period.

2. The method of claim 1, wherein the second time period includes data intended for a plurality of WTRUs.

3. The method of claim 1, wherein the frame is a unicast frame.

4. The method of claim 1, wherein the frame is a multicast frame.

5. The method of claim 1, wherein the quiescent state includes operating signal processing components of the WTRU in a reduced power mode.

6. A wireless transmit/receive unit (WTRU) comprising:

a receiver configured to receive, from a base station, a frame including a synchronization schedule, wherein the synchronization schedule indicates a first time period assigned to the WTRU for receiving data intended for the WTRU during the frame; and

a processor configured to control the receiver to receive the data intended for the WTRU during the first time period, and to operate in a quiescent state during a second time period in the frame on a condition that the second time period is not the first time period.

7. The WTRU of claim 6, wherein the processor is configured to control the receiver to receive the data on a condition that first time period includes data intended for a plurality of WTRUs.

8. The WTRU of claim 6, wherein the receiver is configured to receive the frame as a unicast frame.

9. The WTRU of claim 6, wherein the receiver is configured to receive the frame as a multicast frame.

10. The WTRU of claim 6, wherein the quiescent state includes operating signal processing components of the WTRU in a reduced power mode.

11. A method for use in a base station, the method comprising:

generating a synchronization schedule for a first wireless transmit/receive unit (WTRU), the synchronization schedule indicating a first time period assigned to the first WTRU for receiving data indented for the first WTRU during a frame, wherein the generating is performed such that the first WTRU may operate in a quiescent state during a second time period in the frame on a condition that the second time period is not the first time period;

transmitting the frame to the first WTRU, the frame including the synchronization schedule; and

transmitting the data intended for the first WTRU during the first time period.

12. The method of claim 11, wherein the generating the synchronization schedule includes generating the synchronization schedule for a plurality of WTRUs.

13. The method of claim 12, wherein first time period includes data intended for the plurality of WTRUs.

14. The method of claim 11, wherein the frame is a unicast frame.

15. The method of claim 11, wherein the frame is a multicast frame.

16. The method of claim 11, wherein the quiescent state includes operating signal processing components of the WTRU in a reduced power mode.

17. A base station comprising:

a processor configured to generate a synchronization schedule for a first wireless transmit/receive unit (WTRU), the synchronization schedule indicating a first time period assigned to the first WTRU for receiving data indented for the first WTRU during a frame, wherein the processor is configured to generate the synchronization schedule such that the first WTRU may operate in a quiescent state during a second time period in the frame on a condition that the second time period is not the first time period; and

a transmitter configured to;

transmit the frame to the first WTRU, the frame including the synchronization schedule, and

transmit the data intended for the first WTRU during the first time period.

18. The base station of claim 17, wherein the processor is configured to generate the synchronization schedule for a plurality of WTRUs.

19. The base station of claim 18, wherein the processor is configured to generate the synchronization schedule on a condition that the first time period includes data intended for the plurality of WTRUs.

20. The base station of claim 17, wherein the transmitter is configured to transmit the frame as a unicast frame.

21. The base station of claim 17, wherein the transmitter is configured to transmit the frame as a multicast frame.

22. The base station of claim 17, wherein the quiescent state includes operating signal processing components of the WTRU in a reduced power mode.