Reverse link power control

• US 7,983,708 B2
• Filed: 04/28/2004
• Issued: 07/19/2011
• Est. Priority Date: 04/28/2004
• Status: Expired due to Fees

• Current Assignee: Ericsson Evdo, Inc. (CommScope Holding Company, Inc.)
• Original Assignee: Airvana Network Solutions Inc (Telefonaktiebolaget LM Ericsson)
• Inventors: Harikumar, Gopal, Mehrabanzad, Sepehr, Ananthaiyer, Satish
• Primary Examiner(s): Ajibade Akonai; Olumide T
• Application Number:
  US10/835,546
• Publication Number:
  US 20050245279A1
• Time in Patent Office: 2,638 Days
• Field of Search: 370/331, 370/335, 370/310.2, 370/342, 370/350, 370/318, 370/328, 370/332, 370/333, 455/127.1, 455/522, 455/69, 455/13.4, 455/560, 455/561, 455436-444
• US Class Current: 455/522
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/362 Aspects of the step size
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff

Abstract

The description describes examples for performing reverse link power control in a mobile network having a plurality of first modem devices that receive and transmit signals to wireless access terminals (ATs) and a second device in communication with the plurality of first devices. Execution is transitioned between a first and a second loop to control reverse link power of one of the ATs. The transition is based on a state of a connection. The first control loop executes at one of the first devices and the second loop executes at the second device.

Claims

1. A method of controlling reverse link power of a wireless access terminal (AT) in a mobile network by one or more first devices, the method comprising:

executing a first outer control loop at one of the one or more first devices;

calculating a first power control threshold value;

causing, based on a state of a connection between the mobile network and the AT, reverse link power control to be transitioned from the first outer control loop to a second outer control loop at a second device in communication with the one or more first devices, the first outer control loop and the second outer control loop executing substantially simultaneously; and

receiving, from the second device, a second power control threshold value calculated at the second device,

wherein reverse link power of the AT is controlled based on either the first power control threshold value or the second power control threshold value, and

wherein the first power control threshold value is calculated independently of the second outer control loop.

2. The method of claim 1, wherein causing reverse link power control to be transitioned comprises synchronizing between the first outer control loop and the second outer control loop based on a change of the state.

3. The method of claim 2, wherein the change of the state of the connection comprises a transition from the connection not in handoff to the connection in soft handoff.

4. The method of claim 1, further comprising transmitting the first power control threshold value to the second outer control loop.

5. The method of claim 4, wherein transmitting comprises transmitting the first power control threshold value during transmission of handoff-related data.

6. The method of claim 1, further comprising,

generating at one of the one or more first devices an indicator representing quality of a signal received from the AT;

and

determining the first power control threshold value using the indicator.

7. The method of claim 1, further comprising preventing transmission of a packet from one of the one or more first devices to the second device if the packet is associated with a bad indication.

8. The method of claim 7, further comprising transmitting the bad indication to the second device.

9. The method of claim 1, further comprising determining a good indication or a bad indication of a packet received at one of the one or more first devices using a cyclic redundancy code (CRC) associated with the packet.

10. The method of claim 1, wherein the state of the connection comprises one or more of the connection not in handoff, the connection in softer handoff, or the connection in soft handoff.

11. The method of claim 1, further comprising communicating among the one or more first devices and the second device using one or more of Internet Protocol (IP) or asynchronous transfer mode (ATM).

12. The method of claim 1, wherein the first power control threshold value is used in deriving the second power control threshold value when the state of the connection is in handoff.

13. The method of claim 1, further comprising:

deriving the second power control threshold value from the first power control threshold value based on the state of the connection.

14. A system for controlling reverse link power of a wireless access terminal (AT) in a radio access network (RAN), the system comprising:

a first device configured to receive and to transmit signals to the AT, the first device further configured to execute a first outer control loop to calculate a first power control threshold value;

a second device configured for communication with the first device over a network, the second device further configured to execute a second outer control loop substantially simultaneously with the first outer control loop to calculate a second power control threshold value; and

the first device and the second device further configured to cause reverse link power control to be transitioned between the first outer control loop and the second outer control loop during a transition of a connection from a first state to a second state,

wherein reverse link power of the AT is controlled based on either the first power control threshold value or the second power control threshold value, and

wherein the first power control threshold value is calculated independently of the second outer control loop at the second device.

15. The system of claim 14, wherein the first state of the connection comprises one or more of the connection not in handoff or the connection in softer handoff.

16. The system of claim 14, wherein the second state of the connection comprises the connection in soft handoff.

17. The system of claim 14, wherein the second device is further configured to receive the first power control threshold value.

18. The system of claim 14, wherein the second device is further configured to receive the first power control threshold value during transmission of handoff-related data.

19. The system of claim 14, wherein the first device is further configured (i) to generate an indicator representing quality of a signal received from the AT, and (ii) to calculate the first power control threshold value using the indicator.

20. The system of claim 14, wherein the first device is further configured to:

prevent transmission of a packet from the first device to the second device if the packet is associated with a bad indication; and

transmit the bad indication to the second device in place of the packet.

21. The system of claim 14, wherein the first device is further configured to determine a good indication or a bad indication of a packet using a cyclic redundancy code (CRC) associated with the packet.

22. The system of claim 14, wherein the first device and the second device are configured to communicate using one or more of Internet Protocol (IP) or asynchronous transfer mode (ATM).

23. The system of claim 14, wherein the second device is further configured to synchronize the second outer control loop with the first outer control loop during the transition of the connection from the first state to the second state.

24. The system of claim 14, wherein the first device is further configured to receive the second power control threshold value.

25. The system of claim 14, wherein the first device is further configured to receive the second power control threshold value during transmission of handoff-related data.

26. The system of claim 14, wherein the second device is further configured to (i) transmit the second power control threshold value to the first device while the connection is in either the first state or the second state, and (ii) to use the first power control threshold value in deriving the second power control threshold value only during the transition of said connection;

and

the first device is further configured to derive the first power control threshold value.

27. A non-transitory computer-readable storage medium having instructions stored thereon that are executable by a processor of a first device that is configured to receive and to transmit signals to a wireless access terminal (AT) in a mobile network to cause the processor to perform operations comprising:

executing a first outer control loop at the first device;

calculating a first power control threshold value;

causing, based on a state of a connection between the mobile network and the AT, reverse link power control to be transitioned from the first outer control loop to a second outer control loop at a second device in communication with the first device, the first outer control loop and the second outer control loop executing substantially simultaneously; and

receiving, from the second device, a second power control threshold value calculated at the second device,

wherein reverse link power of the AT is controlled based on either the first power control threshold value or the second power control threshold value, and

wherein the first power control threshold value is calculated independently of the second outer control loop.

28. The computer-readable storage medium of claim 27, wherein the operations further comprise:

synchronizing between the first outer control loop and the second outer control loop based on a change of the state.

29. The computer-readable storage medium of claim 28, wherein the change of state of the connection comprises a transition from the connection not in handoff to the connection in soft handoff.

30. The computer-readable storage medium of claim 27, wherein the operations further comprise:

transmitting to the second outer control loop the first power control threshold value.

31. The computer-readable storage medium of claim 30, wherein the first power control threshold value is transmitted during transmission of handoff-related data.

32. The computer-readable storage medium of claim 27, wherein the operations further comprise:

generating an indicator representing quality of a signal received from the AT; and

calculating the first power control threshold value using the indicator.

33. The computer-readable storage medium of claim 27, wherein the operations further comprise:

preventing transmission of a packet from the first device to the second device if the packet is associated with a bad indication; and

transmitting the bad indication to the second device.

34. The computer-readable storage medium of claim 27, wherein the operation further comprise:

determining a good indication or a bad indication of a packet using a cyclic redundancy code (CRC) associated with the packet.

35. The computer-readable storage medium of claim 27, wherein the state of the connection comprises one or more of said connection not in handoff, the connection in softer handoff, or the connection in soft handoff.

36. The computer-readable storage medium of claim 27, wherein the operations further comprise:

communicating between the first device and the second device using one or more of Internet Protocol (IP) or asynchronous transfer mode (ATM).

37. The computer-readable storage medium of claim 27, wherein the operations further comprise:

selecting one of the first power control threshold value or the second power control threshold value; and

controlling reverse link power of the AT based on the selected power control threshold value.

38. The computer-readable storage medium of claim 27, wherein the operations further comprise:

prioritizing for use in controlling reverse link power of the AT, the second power control threshold value over the first power control threshold value based on the state of the connection.

39. A method of controlling reverse link power of a wireless access terminal (AT) in a mobile network having one or more first devices and a second device configured for communication with the one or more first devices, the method comprising:

executing, at one of the one or more first devices, a first outer control loop to calculate a first power control threshold value;

substantially simultaneously executing, at the second device, a second outer control loop to calculate a second power control threshold value;

controlling reverse link power of the AT based on either the first power control threshold value or the second power control threshold value; and

prioritizing, for use in controlling reverse link power of the AT, the second power control threshold value over the first power control threshold value based on the state of the connection;

wherein the first power control threshold value is calculated independently of the second outer control loop.

40. A system for controlling reverse link power of a wireless access terminal (AT) in a radio access network (RAN), the system comprising:

a first device configured to receive and to transmit signals to the AT, the first device further configured to execute a first outer control loop to calculate a first power control threshold value; and

a second device configured for communication with the first device over a network, the second device further configured to substantially simultaneously execute a second outer control loop to calculate a second power control threshold value;

the first device further configured to control reverse link power of the AT based on either the first power control threshold value or the second power control threshold value;

the first device further configured to prioritize, for use in controlling reverse link power of the AT, the second power control threshold value over the first power control threshold value based on a state of a connection; and

wherein the first power control threshold value is calculated independently of the second outer control loop at the second device.

41. A method of controlling reverse link power of a wireless access terminal (AT) in a mobile network at a first device, the method comprising:

executing a first outer control loop at the first device;

calculating at the first outer control loop a first power control threshold value;

causing, based on a state of a connection between the mobile network and the AT, reverse link outer-loop power control to be transitioned from the first outer control loop to a second outer control loop that executes at a second device configured for communication with the first device,

receiving, from the second device, a second power control threshold value calculated at the second device; and

overwriting the first power control threshold value with the second power control threshold value,

wherein reverse link power of the AT is controlled based on either the first power control threshold value or the second power control threshold value, and

wherein the first power control threshold value is calculated independently of the second power control threshold value.