Synchronization for extending battery life

• US 8,023,475 B2
• Filed: 05/02/2003
• Issued: 09/20/2011
• Est. Priority Date: 05/06/2002
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Terry, Stephen E., Goldberg, Steven Jeffrey
• Primary Examiner(s): Le; Danh C
• Application Number:
  US10/428,566
• Publication Number:
  US 20040028014A1
• Time in Patent Office: 3,063 Days
• Field of Search: 370/347, 370/336, 370/350, 370/311, 370/337, 370/328, 370/422, 455/458, 455/515, 455/343.2, 455/553.1, 455/502
• US Class Current: 370/337
• 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 frame includes a plurality of time slots and the synchronization schedule indicates at least one of the plurality of time slots that includes data intended for the WTRU;

receiving data during the at least one of the plurality of time slots indicated as including data intended for the WTRU; and

operating in a quiescent state during at least one of the plurality of time slots not indicated as including data intended for the WTRU.

2. The method of claim 1, wherein at least one of the plurality of time slots includes data for a plurality of WTRUs.

3. The method of claim 1, wherein the frames are grouped into a series of frames and each WTRU is assigned at least one of the plurality of time slots within the series of frames.

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

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

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

a receiver configured to receive, from a base station, a synchronization schedule, wherein data is received in frames and each frame includes a plurality of time slots, the synchronization schedule indicates, for at least one frame, at least one of the plurality of time slots of the at least one frame that includes data intended for the WTRU; and

a processor configured to activate the WTRU for receipt of data during the at least one of the plurality of time slots indicated as including data intended for the WTRU, and to operate the WTRU in a quiescent state during at least one of the plurality of time slots not indicated as including data intended for the WTRU.

7. The WTRU of claim 6, wherein at least one of the plurality of time slots includes data for a plurality of WTRUs.

8. The WTRU of claim 6, wherein the frames are grouped into a series of frames and the WTRU is assigned one of the plurality of time slots within the series of frames.

9. The WTRU of claim 6, wherein the frame is a unicast frame.

10. The WTRU of claim 6, wherein the frame is a multicast frame.

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

receiving a synchronization schedule from a base station wherein data is received in frames and each frame includes a plurality of time slots and the synchronization schedule indicates, for each frame, which of the plurality of time slots include data intended for the WTRU;

receiving data during each of the plurality of time slots indicated in the synchronization schedule as including data intended for the WTRU; and

entering a quiescent state during each of the plurality of time slots not indicated in the synchronization schedule as including data intended for the WTRU.

12. The method of claim 11, wherein at least one of the plurality of time slots includes data for a plurality of WTRUs.

13. The method of claim 11, wherein the frames are grouped into a series of frames and the WTRU is assigned one of the plurality of time slots within the series of frames.

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

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