US 9,426,752 B2 · Uplink power headroom reporting for carrier aggregation

Abstract

A method for reporting power headroom is disclosed. Power headroom may be reported across all carriers (wideband), for a specific carrier, or for a carrier group. The formula used to calculate the power headroom depends on whether the carrier (or a carrier in the carrier group) has a valid uplink grant. If the carrier or carrier group does not have a valid uplink grant, the power headroom may be calculated based on a reference grant. The power headroom is calculated by a wireless transmit/receive unit and is reported to an eNodeB.

Claims26

Dependent claims

A method comprising:

determining, via a wireless transmit/receive unit (WTRU), a carrier that does not have a physical uplink shared channel (PUSCH) transmission in a subframe i from a plurality of aggregated carriers;
and
calculating, via the WTRU, a power headroom for the carrier according to the formula:
PH(k,i)=PCMAX_carrier(k)−PPUSCH_REF(k,i)
where PH(k,i) is the power headroom for the carrier, k is a carrier number, PCMAX_carrier(k) is a maximum power for the carrier, and PPUSCH_REF(k,i) is a transmit power determined according to a reference grant allocation.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/645,169Filed 4 Oct 2012 · continuation

Priority

3 Dec 2008

Published

US 2013/0028231 A131 Jan 2013

Granted

23 Aug 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

H04W 52/365
With a discrete range or set of values, e.g. step size, ramping or offsets: power headroom reporting
H04W 52/146
Separate analysis of uplink or downlink: uplink power control
H04W 52/242
Using SIR [Signal to Interference Ratio] or other wireless path parameters: taking into account path loss
H04W 52/346
TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading: distributing total power among…

Family

Application61/119,471Us provisional application · filed 3 Dec 2008

Application61/119,799Us provisional application · filed 4 Dec 2008

Application12/630,562Parent of this continuation · filed 3 Dec 2009

US 2013/0028231 A1Pre-grant publication · published 31 Jan 2013

US 8,315,320 B2Parent of this continuation

US 2010/0158147 A1Published application

US 9,426,752 B2This patent

From the US filing history. Foreign family members aren’t listed.

Uplink power headroom reporting for carrier aggregation

Life of this patent

Uplink power headroom reporting for carrier aggregation

Life of this patent

Abstract

Claims26