Power control of point to multipoint physical channels

• US 9,144,027 B2
• Filed: 11/14/2013
• Issued: 09/22/2015
• Est. Priority Date: 08/01/2002
• Status: Expired due to Fees

• Current Assignee: Pantech Wireless, LLC (Ideahub, Inc.)
• Original Assignee: Signal Trust for Wireless Innovation (InterDigital, Inc.)
• Inventors: Terry, Stephen E.
• Primary Examiner(s): Nguyen, Tu X
• Application Number:
  US14/080,250
• Publication Number:
  US 20140073373A1
• Time in Patent Office: 677 Days
• Field of Search: 455/69, 455/522, 455/67.13, 455/115.1, 455/115.3, 455/67.11
• US Class Current: 1/1
• CPC Class Codes: H04W 52/06 TPC algorithms
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/267 taking into account the information rate
• CPC Class Codes: H04W 52/28 using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
• CPC Class Codes: H04W 52/322 Power control of broadcast channels
• CPC Class Codes: H04W 52/327 Power control of multicast channels
• CPC Class Codes: H04W 72/30 Resource management for broadcast services

Abstract

A method and apparatus are used to determine an efficient transmit power for point to multipoint (PtM) transmissions by maintaining a database at a base station which specifies which of a plurality of wireless transmit/receive units (WTRUs) are members of each PtM group. The transmit power of each WTRU'"'"'s downlink dedicated channel is adjusted to the minimum required power necessary and the PtM transmit power for each PtM group is set such that the PtM transmit power of a PtM group is equal to the greatest of a WTRU in the PtM group plus a PtM power offset.

Claims

1. An apparatus comprising:

a transmitter; and

a processor configured to;

categorize each wireless transmit receive unit (WTRU) of a plurality of WTRUs on the basis of an association of each WTRU with at least one of a plurality of point to multipoint (PtM) channels, wherein groups of WTRUs from the plurality of WTRUs are associated with each PtM channel;

adjust a transmit power level of each downlink (DL) channel associated with the plurality of WTRUs; and

set a PtM channel transmission power level for each of the groups of WTRUs, wherein the transmission power level for each PtM channel equals the DL channel transmit power level required for one of the WTRUs of the group of WTRUs associated with the PtM channel adjusted by an offset parameter;

wherein the transmitter is configured to produce a PtM channel having the transmission power level.

2. The apparatus of claim 1, further comprising:

a receiver configured to receive transmit power control (TPC) commands from the plurality of WTRUs;

wherein the processor is further configured to use TPC commands to adjust the transmit power level of each WTRUs'"'"' DL channel at a minimum required power level to achieve a Quality of Service (QoS) associated with each of the WTRUs.

3. The apparatus of claim 1, wherein the offset parameter is an adjustment to correct for Quality of Service (QoS) and coding rate differences between the DL dedicated channel and the PtM channel.

4. The apparatus of claim 1, wherein the processor is further configured to iteratively adjust the transmission power level of the PtM channel based upon a slot basis, a radio frame basis, or a transmission time interval (TTI) basis.

5. The apparatus of claim 1, wherein offset parameter adjusts the transmission power level of a PtM channel in steps measured in decibels (dB).

6. The apparatus of claim 1, wherein the processor is further configured to determine a transmission power for a common channel by multiplying an operator controlled factor with a power ratio and the transmission power level.

7. The apparatus of claim 6, wherein the power ratio is a signal-to-interference ratio or a pathloss factor.

8. A method comprising:

categorizing each wireless transmit receive units (WTRU) of a plurality of WTRUs on the basis of an association of each WTRU with at least one of a plurality of point to multipoint (PtM) channels, wherein groups of WTRUs from the plurality of WTRUs are associated with each PtM channel;

adjusting a transmit power level for each downlink (DL) channel associated with the plurality of WTRUs;

setting a PtM channel transmission power level for each of the groups of WTRUs, wherein a transmission power level for each PtM channel equals the DL channel transmit power level required for one of the WTRUs of the group of WTRUs associated with the PtM channel adjusted by an offset parameter; and

transmitting a PtM channel having the transmission power level.

9. The method of claim 8, further comprising the step of:

receiving transmit power control (TPC) commands from the plurality of WTRUs;

wherein the TPC commands are used to adjust the transmit power level of each WTRUs'"'"' DL channel at a minimum required power level to achieve a Quality of Service (QoS) associated with each of the WTRUs.

10. The method of claim 8, wherein the offset parameter is an adjustment to correct for Quality of Service (QoS) and coding rate differences between the DL dedicated channel and the PtM channel.

11. The method of claim 8, the transmission power level of the PtM channel is iteratively adjusted based upon a slot basis, a radio frame basis, or a transmission time interval (TTI) basis.

12. The method of claim 8, wherein offset parameter adjusts transmission power level of a PtM channel in steps measured in decibels (dB).

13. The method of claim 8 further comprising a determining a transmission power for a common channel by multiplying an operator controlled factor with a power ratio and the transmission power level.

14. The method of claim 8, wherein the power ratio is a signal-to-interference ratio or a pathloss factor.