IP Library › Granted Patent US 12,238,654
Granted Patent B2
US 12,238,654 · App. 18/543,615 · Granted Feb 25, 2025

Power-limit reporting in a communication system using carrier aggregation

Inventors: Martin Feuersaenger (Bremen, DE); Joachim Loehr (Hessen, DE); Christian Wengerter (Kleinheubach, DE)
Assignee: Sun Patent Trust
H04W52/365H04L5/0007H04L5/001H04L5/0037H04L5/0046H04L5/0053H04L5/006H04L5/0064H04W52/146H04W72/0473H04W72/21H04W72/23H04W52/34H04W52/367Y02D30/70
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Quick Facts
Patent No.
US 12,238,654
App. No.
18/543,615
Granted
Feb 25, 2025
Kind
B2
Abstract

Methods inform an eNodeB on the transmit power status of a user equipment in a mobile communication system using component carrier (CC) aggregation. Also described is an implementation of these methods by hardware and in software. The invention proposes procedures that allow the eNodeB to recognize the power usage status of a UE in a communication system using carrier aggregation. The UE indicates to the eNodeB when the UE is close to using its total maximum UE transmit power or when it has exceeded the same. This is achieved by the UE including indicator(s) and/or new MAC CEs to one or more protocol data units transmitted on respective component carriers within a single sub-frame that is providing the eNodeB with power status information. The MAC CEs may report a per-UE power headroom. Alternatively, the MAC CEs may report per-CC power headrooms and/or power reductions applied to the respective uplink CCs.

Claims (13)

1. An integrated circuit for controlling a communication apparatus, the integrated circuit comprising:

control circuitry which, in operation, generates a power status report of the communication apparatus in a communication system using component carrier aggregation, in which two or more component carriers (CCs) are aggregated, wherein the power status report includes: (i) a CC specific maximum transmission power, P CMAX,c , for each configured and activated uplink CC, wherein P CMAX,c shall be set within following bounds:

P CMAX_L,c <=P CMAX,c <=P CMAX_H,c

where P CMAX_L,c is a lower bound and P CMAX_H,c is a higher bound of a CC specific maximum transmission power, and (ii) a power headroom report indicative of a difference between the CC specific maximum transmission power, P CMAX,c , and an estimated communication apparatus transmit power, per each configured and activated uplink CC,

wherein the CC specific maximum transmission power, P CMAX,c , for each configured and activated CC is included in the power status report when a resource is allocated to the configured and activated uplink CC for the communication apparatus; and

transmitting circuitry configured to transmit the power status report to a base station.

2. The integrated circuit according to claim 1 , wherein the power status report is triggered at activation of a configured uplink CC.

3. The integrated circuit according to claim 1 , wherein the power status report is for Uplink Shared Channel (UL-SCH) transmission per configured and activated uplink CC.

4. The integrated circuit according to claim 1 , wherein the power status report for a sub-frame takes into account a transmission power of a Physical Uplink Control Channel (PUCCH) used by the UE in the same sub-frame.

5. The integrated circuit according to claim 1 , wherein in case no resource allocation is available in a sub-frame, the power status report takes into account a predefined uplink grant or a predefined Physical Uplink Shared Channel (PUSCH) power.

6. The integrated circuit according to claim 1 , wherein the power headroom reports on multiple configured and activated uplink CCs are included in a single Media Access Control (MAC) control element, wherein the MAC control element includes a bitmap and a bit set at a certain position of the bitmap indicates the presence of a power headroom report field for a corresponding CC.

7. The integrated circuit according to claim 1 , wherein the power status report includes indicators that indicate, for each (ii) power headroom report, the presence of the associated (i) CC specific maximum transmission power, P CMAX,c , respectively.

8. The integrated circuit according to claim 1 , wherein the CC specific maximum transmission power, P CMAX,c , is a nominal communication apparatus maximum transmit power.

Priority Claims (2)
EP 09013756 · Nov 2, 2009 · regional
EP 10008477 · Aug 13, 2010 · regional
Continuity (9)
Continuation 17728879 · Apr 25, 2022
Continuation 16938374 · Jul 24, 2020
Continuation 16291387 · Mar 4, 2019
Continuation 15702607 · Sep 12, 2017
Continuation 15353323 · Nov 16, 2016
Continuation 14866696 · Sep 25, 2015
Continuation 14316465 · Jun 26, 2014
Continuation 13503739
Related Publication 20240129863A1 · Apr 18, 2024
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