METHOD AND APPARATUS FOR CONTROLLING UPLINK POWER IN A WIRELESS ACCESS SYSTEM

• US 20150304967A1
• Filed: 06/29/2015
• Published: 10/22/2015
• Est. Priority Date: 04/01/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Min Gyu, YANG, Suck Chel, AHN, Joon Kui, SEO, Dong Youn
• Granted Patent: US 9,363,771 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/30 using constraints in the total amount of available transmission power
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A method for reporting power headroom value in a wireless access system that supports a carrier aggregation, and a user equipment (UE) for performing the method are discussed. The method according to one embodiment includes receiving a uplink transmission grant allocating uplink resources on a predetermined subframe in an anchor uplink component carrier (UL CC); obtaining power headroom value for the anchor UL CC, if the UE is configured with a simultaneous physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH) transmission; and reporting the power headroom value to a base station. The power headroom value is calculated.

Claims

1. A method for reporting power headroom value in a wireless access system that supports a carrier aggregation, the method performed by a user equipment (UE) and comprising:

receiving a uplink transmission grant allocating uplink resources on a predetermined subframe in an anchor uplink component carrier (UL CC);

obtaining power headroom value for the anchor UL CC, if the UE is configured with a simultaneous physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH) transmission; and

reporting the power headroom value to a base station,

wherein the power headroom value is calculated by using;

PH_SUM(i)=P_CMAXc−

10 log₁₀(10^PPUSCHc_scheduled^(i)/10+10^PPUCCH_scheduled^(i)/10),

where P_CMAXc represents the maximum transmission power of the UE, P<sub>PUSCH—

scheduled</sub>(i) represents a transmission power for the PUSCH, and P<sub>PUCCH—

scheduled</sub>(i) represents a transmission power for the PUCCH, and

wherein ‘

i’

is an index of the predetermined subframe and ‘

c’

is an index of the anchor UL CC.

2. The method according to claim 1, further comprising:

transmitting the PUCCH on the predetermined subframe in the anchor UL CC.

3. The method according to claim 1, wherein the uplink transmission grant is received via a physical downlink control channel (PDCCH).

4. The method according to claim 1, wherein the anchor UL CC is a primary cell.

5. A user equipment (UE) for reporting power headroom value in a wireless access system that supports a carrier aggregation, the UE comprising:

a transmitter;

a receiver; and

a processor configured to;

report the power headroom value by controlling the transmitter and the receiver,

receive, by controlling the receiver, a uplink transmission grant allocating uplink resources on a predetermined subframe in an anchor uplink component carrier (UL CC),

obtain power headroom value for the anchor UL CC, if the UE is configured with a simultaneous physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH) transmission, and

report, by controlling the transmitter, the power headroom value to a base station,

wherein the power headroom value is calculated by using;

PH_SUM(i)=P_CMAXc−

10 log₁₀(10^PPUSCHc_scheduled^(i)/10+10^PPUCCH_scheduled^(i)/10),

where P_CMAXc represents the maximum transmission power of the UE, P<sub>PUSCH—

scheduled</sub>(i) represents a transmission power for the PUSCH, and P<sub>PUCCH—

scheduled</sub>(i) represents a transmission power for the PUCCH, and

wherein ‘

i’

is an index of the predetermined subframe and ‘

c’

is an index of the anchor UL CC.

6. The UE according to claim 5, wherein the processor is further configured to:

transmit, by controlling the transmitter, the PUCCH on the predetermined subframe in the anchor UL CC.

7. The UE according to claim 5, wherein the uplink transmission grant is received via a physical downlink control channel (PDCCH).

8. The UE according to claim 5, wherein the anchor UL CC is a primary cell.