Method and apparatus for packet communications in wireless systems

• US 20070133479A1
• Filed: 08/04/2006
• Published: 06/14/2007
• Est. Priority Date: 08/26/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gholmieh, Aziz, Montojo, Juan, Grilli, Francesco, Malladi, Durga, Tenny, Nathan
• Granted Patent: US 8,094,595 B2
• Time in Patent Office: Days
• US Class Current: 370/335
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Techniques for transmitting and receiving data in an efficient manner to potentially improve capacity for a wireless network and achieve power savings for a wireless device are described. The techniques utilize a Continuous Packet Connectivity (CPC) mode comprised of multiple (e.g., two) discontinuous transmission (DTX) modes and at least one (e.g., one) discontinuous reception (DRX) mode. Each DTX mode is associated with different enabled uplink subframes usable for transmission from the wireless device to the network. Each DRX mode is associated with different enabled downlink subframes usable by the network for transmission to the wireless device. The wireless device may send signaling and/or data on the enabled uplink subframes and may receive signaling and/or data on the enabled downlink subframes. The wireless device may power down during non-enabled subframes to conserve battery power. Mechanisms to quickly transition between the DTX and DRX modes are described.

Claims

1. A wireless device comprising:

at least one processor to operate in one of multiple discontinuous transmission (DTX) modes or a no DTX mode, while in a connected mode, for transmission to a wireless network, and to operate in one of at least one discontinuous reception (DRX) mode or a no DRX mode, while in the connected mode, for reception from the wireless network; and

a memory coupled to the at least one processor.

2. The wireless device of claim 1, wherein each DTX mode is associated with different subframes usable for sending data, or signaling, or both data and signaling to the wireless network.

3. The wireless device of claim 1, wherein each DRX mode is associated with different subframes usable for receiving data, or signaling, or both data and signaling from the wireless network.

4. The wireless device of claim 1, wherein the multiple DTX modes comprise a first DTX mode, and wherein in the first DTX mode the at least one processor transmits signaling in first enabled subframes corresponding to a subset of subframes available for uplink, and transmits data in the first enabled subframes if there is data to send to the wireless network.

5. The wireless device of claim 4, wherein the multiple DTX modes comprise a second DTX mode, and wherein in the second DTX mode the at least one processor transmits signaling in second enabled subframes corresponding to a subset of the first enabled subframes.

6. The wireless device of claim 4, wherein the first enabled subframes are spaced apart at intervals of T1 subframes, where T1 is a configurable parameter.

7. The wireless device of claim 5, wherein the second enabled subframes are spaced apart at intervals of T2 subframes, where T2 is a configurable parameter.

8. The wireless device of claim 1, wherein the at least one DRX mode comprises a first DRX mode, and wherein in the first DRX mode the at least one processor receives signaling in enabled subframes corresponding to a subset of subframes available for downlink, and receives data in the enabled subframes if the signaling indicates data being sent to the wireless device.

9. The wireless device of claim 8, wherein the enabled subframes are spaced apart at intervals of R subframes, where R is a configurable parameter.

10. The wireless device of claim 1, wherein the multiple DTX modes comprise a DTX mode in which transmit power of the wireless device is not controlled.

11. The wireless device of claim 1, wherein the multiple DTX modes comprise a DTX mode in which the wireless device does not transmit signaling and data on uplink, and wherein the at least one DRX mode comprises a DRX mode in which the wireless device does not receive signaling and data on downlink.

12. The wireless device of claim 1, wherein the at least one processor receives a configuration of T1, T2, R and offset from the wireless network, with T1 defining spacing between first enabled subframes for a first DTX mode, T2 defining spacing between second enabled subframes for a second DTX mode, R defining spacing between third enabled subframes for a DRX mode, and the offset identifying the first, second and third enabled subframes.

13. The wireless device of claim 1, wherein the at least one processor autonomously transitions between the multiple DTX modes.

14. The wireless device of claim 1, wherein the at least one processor autonomously transitions to the no DTX mode based on data load at the wireless device.

15. The wireless device of claim 1, wherein the at least one processor transitions between the at least one DRX mode and the no DRX mode based on signaling from the wireless network.

16. The wireless device of claim 1, wherein the at least one processor receives the signaling to transition between the at least one DRX mode and the no DRX mode from the wireless network via Layer 1 or Layer 2.

17. The wireless device of claim 1, wherein the at least one processor transitions between an active mode and a continuous packet connectivity (CPC) mode based on signaling from the wireless network, wherein the CPC mode comprises the multiple DTX modes and the at least one DRX mode, and wherein the active mode comprises the no DTX mode and the no DRX mode.

18. A wireless device comprising:

at least one processor to operate in a connected mode for communication with a wireless network and to operate in one of multiple discontinuous transmission (DTX) modes or a no DTX mode, while in the connected mode, for transmission to a wireless network; and

a memory coupled to the at least one processor.

19. A wireless device comprising:

at least one processor to operate in a connected mode for communication with a wireless network and to operate in one of at least one discontinuous reception (DRX) mode or a no DRX mode, while in the connected mode, for reception from the wireless network; and

a memory coupled to the at least one processor.

20. A method comprising:

operating in one of multiple discontinuous transmission (DTX) modes or a no DTX mode, while in a connected mode, for transmission to a wireless network; and

operating in one of at least one discontinuous reception (DRX) mode or a no DRX mode, while in the connected mode, for reception from the wireless network.

21. The method of claim 20, wherein the multiple DTX modes comprise a first DTX mode, and wherein operating in the first DTX mode comprises

transmitting signaling in first enabled subframes corresponding to a subset of subframes available for uplink, and

transmitting data in the first enabled subframes if there is data to send to the wireless network.

22. The method of claim 21, wherein the multiple DTX modes comprise a second DTX mode, and wherein operating in the second DTX mode comprises

transmitting signaling in second enabled subframes corresponding to a subset of the first enabled subframes.

23. The method of claim 20, wherein the operating in one of the at least one DRX mode comprises

receiving signaling in enabled subframes corresponding to a subset of subframes available for downlink, and

receiving data in the enabled subframes if the signaling indicates data being sent to the wireless device.

24. The method of claim 20, further comprising:

autonomously transitioning between the multiple DTX modes; and

autonomously transitioning to the no DTX mode based on data load at the wireless device

25. The method of claim 20, further comprising:

transitioning between the at least one DRX mode and the no DRX mode based on signaling from the wireless network.

26. An apparatus comprising:

means for operating in one of multiple discontinuous transmission (DTX) modes or a no DTX mode, while in a connected mode, for transmission to a wireless network; and

means for operating in one of at least one discontinuous reception (DRX) mode or a no DRX mode, while in the connected mode, for reception from the wireless network.

27. The apparatus of claim 26, wherein the multiple DTX modes comprise a first DTX mode, and wherein means for operating in the first DTX mode comprises

means for transmitting signaling in first enabled subframes corresponding to a subset of subframes available for uplink, and

means for transmitting data in the first enabled subframes if there is data to send to the wireless network.

28. The apparatus of claim 27, wherein the multiple DTX modes comprise a second DTX mode, and wherein means for operating in the second DTX mode comprises

means for transmitting signaling in second enabled subframes corresponding to a subset of the first enabled subframes.

29. The apparatus of claim 26, wherein the means for operating in one of the at least one DRX mode comprises

means for receiving signaling in enabled subframes corresponding to a subset of subframes available for downlink, and

means for receiving data in the enabled subframes if the signaling indicates data being sent to the wireless device.

30. An apparatus comprising:

at least one processor to receive from a wireless device operating in one of multiple discontinuous transmission (DTX) modes or a no DTX mode while in a connected mode, and to transmit to the wireless device operating in one of at least one discontinuous reception (DRX) mode or a no DRX mode while in the connected mode; and

a memory coupled to the at least one processor.

31. The apparatus of claim 30, wherein the multiple DTX modes comprise a first DTX mode, and wherein when the wireless device operates in the first DTX mode the at least one processor receives signaling from the wireless device in first enabled subframes corresponding to a subset of subframes available for uplink, and receives data from the wireless device in the first enabled subframes if the signaling indicates data being sent by the wireless device.

32. The apparatus of claim 31, wherein the multiple DTX modes comprise a second DTX mode, and wherein when the wireless device operates in the second DTX mode the at least one processor receives signaling from the wireless device in second enabled subframes corresponding to a subset of the first enabled subframes.

33. The apparatus of claim 30, wherein the at least one processor detects for signaling from the wireless device in all subframes available for the uplink.

34. The apparatus of claim 30, wherein the at least one DRX mode comprises a first DRX mode, and wherein when the wireless device operates in the first DRX mode the at least one processor transmits signaling to the wireless device in enabled subframes corresponding to a subset of subframes available for downlink, and transmits data to the wireless device in the enabled subframes if there is data to send to the wireless device.

35. The apparatus of claim 30, wherein the at least one processor sends a configuration of T1, T2, R and offset to the wireless device, with T1 defining spacing between first enabled subframes for a first DTX mode, T2 defining spacing between second enabled subframes for a second DTX mode, R defining spacing between third enabled subframes for a DRX mode, and the offset identifying the first, second and third enabled subframes.

36. The apparatus of claim 30, wherein the at least one processor sends signaling to direct the wireless device to transition between the at least one DRX mode and the no DRX mode.

37. The apparatus of claim 30, wherein the at least one processor sends signaling to direct the wireless device to transition between an active mode and a continuous packet connectivity (CPC) mode, wherein the CPC mode comprises the multiple DTX modes and the at least one DRX mode, and wherein the active mode comprises the no DTX mode and the no DRX mode.

38. A method comprising:

receiving from a wireless device operating in one of multiple discontinuous transmission (DTX) modes or a no DTX mode while in a connected mode; and

transmitting to the wireless device operating in one of at least one discontinuous reception (DRX) mode or a no DRX mode while in the connected mode.

39. The method of claim 38, wherein the multiple DTX modes comprise a first DTX mode, and wherein receiving from the wireless device operating in the first DTX mode comprises

receiving signaling from the wireless device in first enabled subframes corresponding to a subset of subframes available for uplink, and

receiving data from the wireless device in the first enabled subframes if the signaling indicates data being sent by the wireless device.

40. The method of claim 39, wherein the multiple DTX modes comprise a second DTX mode, and wherein receiving from the wireless device operating in the second DTX mode comprises

receiving signaling from the wireless device in second enabled subframes corresponding to a subset of the first enabled subframes.

41. The method of claim 38, wherein the transmitting to the wireless device operating in one of the at least one DRX mode comprises

transmitting signaling to the wireless device in enabled subframes corresponding to a subset of subframes available for downlink, and

transmitting data to the wireless device in the enabled subframes if there is data to send to the wireless device.

42. An apparatus comprising:

means for receiving from a wireless device operating in one of multiple discontinuous transmission (DTX) modes or a no DTX mode while in a connected mode; and

means for transmitting to the wireless device operating in one of at least one discontinuous reception (DRX) mode or a no DRX mode while in the connected mode.

43. The apparatus of claim 42, wherein the multiple DTX modes comprise a first DTX mode, and wherein means for receiving from the wireless device operating in the first DTX mode comprises

means for receiving signaling from the wireless device in first enabled subframes corresponding to a subset of subframes available for uplink, and

means for receiving data from the wireless device in the first enabled subframes if the signaling indicates data being sent by the wireless device.

44. The apparatus of claim 43, wherein the multiple DTX modes comprise a second DTX mode, and wherein means for receiving from the wireless device operating in the second DTX mode comprises

means for receiving signaling from the wireless device in second enabled subframes corresponding to a subset of the first enabled subframes.

45. The apparatus of claim 42, wherein the means for transmitting to the wireless device operating in one of the at least one DRX mode comprises

means for transmitting signaling to the wireless device in enabled subframes corresponding to a subset of subframes available for downlink, and

means for transmitting data to the wireless device in the enabled subframes if there is data to send to the wireless device.