Synchronization for extending battery life

• US 9,730,158 B2
• Filed: 12/12/2013
• Issued: 08/08/2017
• 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:
  US14/104,497
• Publication Number:
  US 20140098730A1
• Time in Patent Office: 1,335 Days
• Field of Search: 370350, 370347, 370328, 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 method for use in a wireless transmit/receive unit (WTRU) for saving battery power, the method comprising:

receiving first information on a downlink control channel;

receiving, in response to the first information, user data in a series of transmission time intervals (TTIs) and reducing power consumption during at least a portion of a TTI between TTIs of the series of TTIs on a condition that user data is not received;

wherein each TTI in the series of TTIs is separated by N TTIs;

wherein N is at least one;

receiving a signal; and

receiving, in response to the received signal, user data in a TTI between TTIs of the series of TTIs.

2. The method of claim 1, wherein the reducing power consumption during at least the portion of the TTIs that user data is not received includes operating radio frequency (RF) reception circuitry of the WTRU in a reduced power mode.

3. The method of claim 1, wherein the reducing power consumption during at least the portion of the TTIs that user data is not received includes operating signal processing circuitry of the WTRU in a reduced power mode.

4. The method of claim 1, wherein the data received in the TTI between TTIs of the series of TTIs is transmitted in a unicast frame.

5. The method of claim 1, wherein the data received in the TTI between TTIs of the series of TTIs is transmitted in a multicast frame.

6. A wireless transmit/receive unit (WTRU) configured for saving battery power, the WTRU comprising:

circuitry configured to receive first information on a downlink control channel;

the circuitry is further configured in response to the first information, to receive user data in a series of transmission time intervals (TTIs) and to reduce power consumption during at least a portion of a TTI between TTIs of the series of TTIs on a condition that user data is not received;

wherein each TTI in the series of TTIs is separated by N TTIs;

wherein N is at least one;

the circuitry is further configured to receive a signal; and

the circuitry is further configured in response to the received signal to receive user data in a TTI between TTIs of the series of TTIs.

7. The WTRU of claim 6, wherein the reducing power consumption during at least the portion of the TTIs that user data is not received includes operating radio frequency (RF) reception circuitry of the WTRU in a reduced power mode.

8. The WTRU of claim 6, wherein the reducing power consumption during at least the portion of the TTIs that user data is not received includes operating signal processing circuitry of the WTRU in a reduced power mode.

9. The WTRU of claim 6, wherein the data received in the TTI between TTIs of the series of TTIs is transmitted in a unicast frame.

10. The WTRU of claim 6, wherein the data received in the TTI between TTIs of the series of TTIs is transmitted in a multicast frame.

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

transmitting first information on a downlink control channel;

transmitting, based on the first information, user data in a series of transmission time intervals (TTIs) to enable a wireless transmit/receive unit (WTRU) to reduce power consumption during at least a portion of a TTI between TTIs of the series of TTIs on a condition that user data is not received;

wherein each TTI in the series of TTIs is separated by N TTIs;

wherein N is at least one;

transmitting a signal; and

transmitting, based on the signal, user data in a TTI between TTIs of the series of TTIs.

12. The method of claim 11, wherein the reducing power consumption during at least the portion of the TTIs that user data is not received includes operating radio frequency (RF) reception circuitry of the WTRU in a reduced power mode.

13. The method of claim 11, wherein the reducing power consumption during at least the portion of the TTIs that user data is not received includes operating signal processing circuitry of the WTRU in a reduced power mode.

14. The method of claim 11, wherein the data transmitted in the TTI between TTIs of the series of TTIs is transmitted in a unicast frame.

15. The method of claim 11, wherein the data transmitted in the TTI between TTIs of the series of TTIs is transmitted in a multicast frame.