Power control in a wireless communication system

• US 8,897,828 B2
• Filed: 08/12/2004
• Issued: 11/25/2014
• Est. Priority Date: 08/12/2004
• Status: Active Grant

• Current Assignee: Intellectual Ventures II LLC (Intellectual Ventures LLC)
• Original Assignee: Intellectual Ventures Holding 81 LLC (Intellectual Ventures LLC)
• Inventors: Anderson, Nicholas William
• Primary Examiner(s): Rego, Dominic E
• Application Number:
  US10/917,968
• Publication Number:
  US 20060035660A1
• Time in Patent Office: 3,757 Days
• Field of Search: 455/522, 455/68, 455/69, 455/296, 455/135, 455/226.3, 455/277.2, 455/115.3, 455/126, 455/127.1, 455/127.2, 455/67.11, 455/434, 455/436, 370/331, 370/320, 370/335, 370/342, 370/318, 370/392, 370/252, 370/276, 370/280, 375/147, 375/130
• US Class Current: 455/522
• CPC Class Codes: H04W 52/06 TPC algorithms
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/221 using past power control commands
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 72/0473 the resource being transmission power
• CPC Class Codes: H04W 72/1268 of uplink data flows
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Power control in a wireless network is disclosed. Transmit power control (TPC) commands may be accumulated by a user equipment (UE). If accumulation is enabled, the UE may receive on a single physical channel an allocation of a scheduled uplink resource and a TPC command. The TPC command may be accumulated with other received TPC commands. A transmit power for an uplink communication based on both the path loss and the accumulated TPC commands may then be calculated by the UE. If accumulation is not enabled, the UE may receive an allocation of a scheduled uplink resource to transmit data at a calculated power level.

Claims

1. A method performed by user equipment (UE), the method comprising:

receiving, by the UE, an indication of whether accumulation of transmit power control (TPC) commands is enabled;

determining, by the UE, a path loss of a downlink channel;

receiving, on a single physical channel by the UE if accumulation is enabled, an allocation of a scheduled uplink resource and a TPC command, wherein the TPC command is accumulated with other received TPC commands;

calculating, by the UE if accumulation is enabled, transmit power in association with an uplink communication based on both the path loss and the accumulated TPC commands; and

receiving, on the single physical channel by the UE if accumulation is not enabled, an allocation of a scheduled uplink resource to transmit data at a power level calculated by the UE based on the path loss.

2. The method of claim 1, wherein the TPC command is a multilevel TPC command.

3. The method of claim 1, wherein the UE is a code division multiple access (CDMA) UE.

4. The method of claim 1, wherein the UE is a time division duplex (TDD) UE.

5. The method of claim 1, wherein the determining the path loss further includes computing a difference between a signaled transmit power and a measured received power of the downlink channel.

6. The method of claim 1, wherein the calculated transmit power is based on a selected transport format.

7. The method of claim 1, wherein the downlink channel or the single physical channel is each associated with a spreading factor or a code division multiple access (CDMA) code.

8. A user equipment (UE) characterized in that:

circuitry is configured to receive, by the UE, an indication of whether accumulation of transmit power control (TPC) commands is enabled;

circuitry is configured to determine a path loss of a downlink channel;

the circuitry is further configured to receive, on a single physical channel if accumulation is enabled, an allocation of a scheduled uplink resource and a TPC command, wherein the TPC command is accumulated with other received TPC commands;

circuitry is configured to calculate, by the UE if accumulation is enabled, transmit power in association with an uplink communication based on both the path loss and the accumulated TPC commands; and

the circuitry is further configured to receive, on the single physical channel by the UE if accumulation is not enabled, an allocation of a scheduled uplink resource to transmit data at a power level calculated by the UE based on the path loss.

9. The UE of claim 8, wherein the TPC command is a multilevel TPC command.

10. The UE of claim 8, wherein the UE is a code division multiple access (CDMA) UE.

11. The UE of claim 8, wherein the UE is a time division duplex (TDD) UE.

12. The UE of claim 8, wherein the determination of the path loss further includes a computation of a difference between a signaled transmit power and a measured received power of the downlink channel.

13. The UE of claim 8, wherein the calculated transmit power is based on a selected transport format.

14. The UE of claim 8, wherein the downlink channel or the single physical channel is each associated with a spreading factor or a code division multiple access (CDMA) code.

15. A method performed by a wireless network, the method comprising:

sending, by the wireless network, an indication of whether accumulation of transmit power control (TPC) commands is enabled;

determining, by a user equipment (UE), a path loss of a downlink channel;

receiving, on a single physical channel by the UE if accumulation is enabled, an allocation of a scheduled uplink resource and a TPC command, wherein the TPC command is accumulated with other received TPC commands;

calculating, by the UE if accumulation is enabled, transmit power in association with an uplink communication based on both the path loss and the accumulated TPC commands; and

receiving, on the single physical channel by the UE if accumulation is not enabled, an allocation of a scheduled uplink resource to transmit data to the wireless network at a power level calculated by the UE based on the path loss.

16. The method of claim 15, wherein the TPC command is a multilevel TPC command.

17. The method of claim 15, wherein the UE is a code division multiple access (CDMA) UE.

18. The method of claim 15, wherein the UE is a time division duplex (TDD) UE.

19. The method of claim 15, wherein the determining the path loss further includes computing a difference between a signaled transmit power and a measured received power of the downlink channel.

20. The method of claim 15, wherein the calculated transmit power is based on a selected transport format.

21. The method of claim 15, wherein the downlink channel or the single physical channel is each associated with a spreading factor or a code division multiple access (CDMA) code.

22. A wireless network characterized in that:

the wireless network is configured to send an indication of whether accumulation of transmit power control (TPC) commands is enabled;

a user equipment (UE) characterized in that;

circuitry is configured to determine, by the UE, a path loss of a downlink channel;

circuitry is configured to receive, on a single physical channel if accumulation is enabled, an allocation of a scheduled uplink resource and a TPC command, wherein the TPC command is accumulated with other received TPC commands;

circuitry is configured to calculate, by the UE if accumulation is enabled, transmit power in association with an uplink communication based on both the path loss and the accumulated TPC commands; and

the circuitry is further configured to receive, on the single physical channel by the UE if accumulation is not enabled, an allocation of a scheduled uplink resource to transmit data to the wireless network at a power level calculated by the UE based on the path loss.

23. The wireless network of claim 22, wherein the TPC command is a multilevel TPC command.

24. The wireless network of claim 22, wherein the UE is a code division multiple access (CDMA) UE.

25. The wireless network of claim 22, wherein the UE is a time division duplex (TDD) UE.

26. The wireless network of claim 22, wherein the determination of the path loss further includes a computation of a difference between a signaled transmit power and a measured received power of the downlink channel.

27. The wireless network of claim 22, wherein the calculated transmit power is based on a selected transport format.

28. The wireless network of claim 22, wherein the downlink channel or the single physical channel is each associated with a spreading factor or a code division multiple access (CDMA) code.

29. A method performed by a network device, the method comprising:

sending, by the network device, an indication of whether accumulation of transmit power control (TPC) commands is enabled;

sending, on a single physical channel by the network device if accumulation is enabled, an allocation of a scheduled uplink resource and a TPC command to be accumulated with other received TPC commands at a user equipment (UE);

receiving, by the network device if accumulation is enabled, uplink communication at a transmit power, wherein the transmit power is calculated at the UE based on both a determined path loss of a downlink channel and the accumulated TPC commands; and

sending, on the single physical channel to the UE if accumulation is not enabled, an allocation of a scheduled uplink resource to transmit data to the network device at a power level calculated at the UE based on the path loss.

30. The method of claim 29, wherein the TPC command is a multilevel TPC command.

31. The method of claim 29, wherein the network device is a code division multiple access (CDMA) network device.

32. The method of claim 29, wherein the network device is a time division duplex (TDD) network device.

33. The method of claim 29, wherein the determined path loss further includes computing a difference between a signaled transmit power and a measured received power of the downlink channel.

34. The method of claim 29, wherein the calculated transmit power is based on a selected transport format.

35. The method of claim 29, wherein the downlink channel or the single physical channel is each associated with a spreading factor or a code division multiple access (CDMA) code.

36. A network device characterized in that:

circuitry is configured to send, by the network device, an indication of whether accumulation of transmit power control (TPC) commands is enabled;

the circuitry is further configured to send, on a single physical channel if accumulation is enabled, an allocation of a scheduled uplink resource and a TPC command to be accumulated with other received TPC commands at a user equipment (UE);

circuitry is configured to receive, if accumulation is enabled, uplink communication at a transmit power, wherein the transmit power is calculated at the UE based on both a determined path loss of a downlink channel and the accumulated TPC commands; and

the circuitry is further configured to send, on the single physical channel if accumulation is not enabled, an allocation of a scheduled uplink resource to transmit data to the network device at a power level calculated at the UE based on the path loss.

37. The network device of claim 36, wherein the TPC command is a multilevel TPC command.

38. The network device of claim 36, wherein the network device is a code division multiple access (CDMA) network device.

39. The network device of claim 36, wherein the network device is a time division duplex (TDD) network device.

40. The network device of claim 36, wherein the determined path loss further includes a computation of a difference between a signaled transmit power and a measured received power of the downlink channel.

41. The network device of claim 36, wherein the calculated transmit power is based on a selected transport format.

42. The network device of claim 36, wherein the downlink channel or the single physical channel is each associated with a spreading factor or a code division multiple access (CDMA) code.