Method and apparatus for the transmission of short data bursts in CDMA/HDR networks

• US 6,952,426 B2
• Filed: 12/07/2000
• Issued: 10/04/2005
• Est. Priority Date: 12/07/2000
• Status: Active Grant

• Current Assignee: Ericsson AB (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Paranchych, David, Khafizov, Farid, Wu, Geng
• Primary Examiner(s): Pezzlo, John
• Assistant Examiner(s): Tsegaye, Saba
• Application Number:
  US09/732,260
• Publication Number:
  US 20020071445A1
• Time in Patent Office: 1,762 Days
• Field of Search: 370310-313, 370329-332, 370/335, 370/342, 370/350, 370/432, 370/436, 370/441, 455/450, 455/464
• US Class Current: 370/441
• CPC Class Codes: H04W 52/0206 in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A method and apparatus for the transmission of short data bursts in CDMA/HDR networks. Dormant access terminals are assigned to a common traffic channel and rate group by an access point. The access point then informs the access terminals of the assigned common traffic channels and rate groups. The access point then transmits short data bursts to the dormant access terminals using the assigned common traffic channels and rate groups. If an access terminal fails to acknowledge receipt of a short data burst, then the access terminal is re-assigned to a new common traffic channel and rate group and transmission of the short data bursts is re-attempted. If an access terminal fails to acknowledge receipt of a short data burst more than a predetermined number of times, then the access terminal is placed in an active mode of operation. The transmission of short data bursts may be further assigned to time slots within the common traffic channels and rate groups in order to conserve the resources of the access terminals.

Claims

1. A method of operating access points in a CDMA/HDR communications network including access terminals capable of operation in an active or a dormant mode of operation, comprising:

one or more of the access points detecting that one or more of the access terminals are operating in or transitioning to a dormant mode of operation;

one or more of the access points assigning one or more of the dormant access terminals to one or more corresponding common traffic channels;

one or more of the access points transmitting short data bursts to one or more of the dormant access terminals using the assigned corresponding common traffic channels;

one or more of the access points detecting that one or more of the dormant access terminals did not acknowledge receipt of the short data bursts;

one or more of the access points re-assigning one or more of the non-acknowledging dormant access terminals to different corresponding common channels; and

one or more of the access points re-transmitting the short data bursts to one or more of the non-acknowledging dormant access terminals using the re-assigned common traffic channels.

2. The method of claim 1, further comprising:

one or more of the access points transmitting control signals to one or more of the dormant access terminals that include the corresponding assigned common traffic channels.

3. The method of claim 1, wherein the re-assigned corresponding traffic channels are determined as a function of the carrier to interference ratios for the corresponding forward communication links between the access points and the corresponding dormant access terminals.

4. The method of claim 1, further comprising:

one or more of the access points transmitting control signals to one or more of the non-acknowledging dormant access terminals that include the re-assigned corresponding common traffic channels.

5. The method of claim 1, further comprising:

one or more of the access points detecting that one or more of the dormant access terminals did not acknowledge receipt of the short data bursts N times; and

one or more of the access points placing one or more of the N times non-acknowledging dormant access terminals in the active mode of operation.

6. The method of claim 1, further comprising:

one or more of the access points detecting that one or more of the dormant access terminals did not acknowledge receipt of the short data bursts N times.

7. The method of claim 1, further comprising:

one or more of the access points assigning one or more of the dormant access terminals to one or more corresponding common traffic channels and rate groups.

8. The method of claim 7, wherein each rate group designates a corresponding rate of data transmission from the access points to the corresponding dormant access terminals.

9. The method of claim 7, further comprising:

one or more of the access points transmitting control signals to one or more of the dormant access terminal that include the corresponding assigned common traffic channels and rate groups.

10. The method of claim 7, further comprising:

one or more of the access points transmitting short data bursts to one or more of the dormant access terminals using the assigned common traffic channels and rate groups.

11. The method of claim 10, further comprising:

one or more of the access points detecting that one or more of the dormant access terminals did not acknowledge receipt of the short data bursts N times; and

one or more of the access points placing one or more of the N times non-acknowledging dormant access terminals in the active mode of operation.

12. The method of claim 10, further comprising:

one or more of the access points detecting that one or more of the dormant access terminals did not acknowledge receipt of the short data bursts N times.

13. The method of claim 1, further comprising:

one or more of the access points assigning the dormant access terminals to one or more corresponding common traffic channels and time slots.

14. The method of claim 13, wherein each time slot designates a time period during which data will be transmitted from the access points to the corresponding dormant access terminals.

15. The method of claim 13, further comprising:

one or more of the access points transmitting control signals to the dormant access terminals that include the corresponding assigned common traffic channels and time slots.

16. The method of claim 13, further comprising:

one or more of the access points transmitting short data bursts to the dormant access terminals using the assigned common traffic channels and time slots.

17. The method of claim 16, further comprising:

one or more of the access points detecting that one or more of the dormant access terminals did not acknowledge receipt of the short data bursts; and

one or more of the access points re-transmitting the short data bursts using the assigned corresponding common traffic channels and time slots.

18. The method of claim 16, further comprising:

one or more of the access points detecting that one or more of the dormant access terminals did not acknowledge receipt of the short data bursts N times; and

one or more of the access points placing one or more of the N times non-acknowledging dormant access terminals in the active mode of operation.

19. A method of operating access terminals capable of operation in an active mode of operation or a dormant mode of operation in a CDMA/HDR communications network including one or more access points, comprising:

operating one or more of the access terminals in the dormant mode of operation;

one or more of the dormant access terminals receiving short data bursts within common traffic channels assigned to the dormant access terminals;

one or more of the dormant access terminals not acknowledging receipt of the short data bursts; and

one or more of the non acknowledging dormant access terminals re-receiving the short data bursts using re-assigned common traffic channels.

20. The method of claim 19, further comprising:

one or more of the dormant access terminals receiving control signals that include the assigned common traffic channels.

21. The method of claim 19, wherein the re-assigned traffic channels are determined as a function of the carrier to interference ratios for the forward communication links between the dormant access terminals and the access points.

22. The method of claim 19, further comprising:

one or more of the dormant access terminals receiving control signals that include the re-assigned corresponding common traffic channels.

23. The method of claim 19, further comprising:

one or more of the dormant access terminals being assigned to rate groups.

24. The method of claim 23, wherein each rate group designates a rate of data reception by one or more of the dormant access terminals.

25. The method of claim 23, further comprising:

one or more of the dormant access terminals receiving control signals that include the assigned common traffic channels and rate groups.

26. The method of claim 23, further comprising:

one or more of the dormant access terminals receiving short data bursts using the assigned common traffic channels and rate groups.

27. The method of claim 19, further comprising:

one or more of the dormant access terminals assigned to one or more time slots.

28. The method of claim 27, wherein each time slot designates a time period during which data will be received by one or more of the dormant access terminals.

29. The method of claim 27, further comprising:

one or more of the dormant access terminals receiving control signals that include the assigned common traffic channels and time slots.

30. The method of claim 27, further comprising:

one or more of the dormant access terminals receiving short data bursts using the assigned common traffic channels and time slots.

31. The method of claim 19, further comprising:

one or more of the dormant access terminals assigned to rate groups and time slots.

32. The method of claim 31, wherein each rate group designates a rate at which data will be received by one or more of the dormant access terminals;

and

wherein each time slot designates a time period during which the data will be received by one or more of the dormant access terminals.

33. The method of claim 31, further comprising:

one or more of the dormant access terminals receiving control signals that include the assigned common traffic channels, rate groups, and time slots.

34. The method of claim 31, further comprising:

one or more of the dormant access terminals receiving short data bursts using the assigned common traffic channels, rate groups, and time slots.

35. A communications network, comprising:

one or more access terminals adapted to operate in an active or a dormant mode of operation; and

one or more access points operably coupled to the access terminals;

wherein, if one or more access terminals are operating in or transitioning to a dormant mode of operation, one or more access points are adapted to assign the access terminals to one or more corresponding common traffic channels;

wherein one or more access points are adapted to transmit short data bursts to the dormant access terminals using the assigned corresponding common traffic channels;

wherein if one or more access terminals do not acknowledge receipt of the short data bursts, then one or more access points are adapted to re-assign one or more non-acknowledging access terminals to different corresponding common traffic channels;

wherein one or more access points are adapted to retransmit the short data bursts to one or more non-acknowledging access terminals using the re-assigned common traffic channel.

36. The network of claim 35, wherein one or more access points are adapted to transmit control signals to the dormant access terminals that include the corresponding assigned common traffic channels.

37. A method of operating access points in a CDMA/HDR communications network including access terminals capable of operation in an active or a dormant mode of operation, comprising:

one or more of the access points assigning one or more of dormant access terminals to one or more corresponding common traffic channels;

one or more of the access points detecting that one or more of the dormant access terminals did not acknowledge receipt of short data bursts; and

one or more of the access points re-assigning one or more of the non-acknowledging dormant access terminals to different corresponding common traffic channels.