Synchronization for extending battery life

• US 10,356,718 B2
• Filed: 08/07/2017
• Issued: 07/16/2019
• 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.
• Primary Examiner(s): Le, Danh C
• Application Number:
  US15/670,695
• Publication Number:
  US 20170339637A1
• Time in Patent Office: 708 Days
• Field of Search: 370350, 370347, 370329, 370337, 455458
• 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 wireless transmit/receive unit (WTRU) comprising:

a receiver configured to receive scheduling information on a broadcast control channel (BCCH) indicating transmission time intervals to monitor for downlink shared channel transmissions of broadcast data, wherein each transmission time interval is at least one time slot in duration;

the receiver further configured to monitor the transmission time intervals;

the receiver further configured to receive broadcast data in downlink shared channel transmissions during the monitored transmission time intervals based on the scheduling information; and

the receiver further configured to receive synchronization information prior to the scheduling information, wherein the scheduling information is received at one or more fixed intervals.

2. The WTRU of claim 1, wherein the receiver enters a reduced power state between the monitored transmission time intervals.

3. The WTRU of claim 2, wherein the reduced power state includes operating radio frequency (RF) reception circuitry of the WTRU in a reduced power mode.

4. The WTRU of claim 1, wherein the scheduling information is received from a base station.

5. The WTRU of claim 1, further comprising:

a transmitter configured to transmit a request for one or more messages, wherein an availability of the one or more messages is indicated via the broadcast control channel.

15. The WTRU of claim 1, wherein receipt of the broadcast data is unacknowledged by the WTRU.

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

receiving scheduling information on a broadcast control channel (BCCH) indicating transmission time intervals to monitor for downlink shared channel transmissions of broadcast data, wherein each transmission time interval is at least one time slot in duration;

monitoring the transmission time intervals;

receiving broadcast data in downlink shared channel transmissions during the monitored transmission time intervals based on the scheduling information; and

receiving synchronization information prior to the scheduling information, wherein the scheduling information is received at one or more fixed intervals.

7. The method of claim 6, wherein the receiver enters a reduced power state between the monitored transmission time intervals.

8. The method of claim 7, wherein the reduced power state includes operating radio frequency (RF) reception circuitry of the WTRU in a reduced power mode.

9. The method of claim 6, wherein the scheduling information is received from a base station.

10. The method of claim 6, further comprising:

transmitting a request for one or more messages, wherein an availability of the one or more messages is indicated via the broadcast control channel.

16. The method of claim 6, wherein receipt of the broadcast data is unacknowledged by the WTRU.

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

transmitting scheduling information on a broadcast control channel (BCCH) indicating transmission time intervals to monitor for downlink shared channel transmissions of broadcast data, wherein each transmission time interval is at least one time slot in duration;

transmitting broadcast data in downlink shared channel transmissions during the monitored transmission time intervals based on the scheduling information; and

transmitting synchronization information prior to the scheduling information, wherein the scheduling information is transmitted at one or more fixed intervals.

12. The method of claim 11, wherein the scheduling information is transmitted to a wireless transmit/receive unit (WTRU).

13. The method of claim 12, wherein the WTRU enters a reduced power state between the monitored transmission time intervals.

14. The method of claim 13, wherein the reduced power state includes operating radio frequency (RF) reception circuitry of the WTRU in a reduced power mode.

17. The method of claim 11, wherein receipt of the broadcast data is unacknowledged.

18. The method of claim 11, further comprising:

receiving a request for one or more messages, wherein an availability of the one or more messages is indicated via the broadcast control channel.