Managing transmission power of a random access channel for first and second cell groups

• US 9,980,234 B2
• Filed: 07/06/2017
• Issued: 05/22/2018
• Est. Priority Date: 01/03/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yang, Suckchel, Ahn, Joonkui, Seo, Dongyoun, Yi, Yunjung
• Primary Examiner(s): Sobutka, Philip
• Application Number:
  US15/643,089
• Publication Number:
  US 20170303205A1
• Time in Patent Office: 320 Days
• Field of Search: 455522
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 5/00 Arrangements affording multiple use of the transmission path
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/281 taking into account user or data type priority
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• 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 52/40 during macro-diversity or soft handoff
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 52/58 Format of the TPC bits
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• 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 76/15 : Setup of multiple wireless link connections
• CPC Class Codes: H04W 88/02 : Terminal devices

Abstract

The present invention relates to a wireless communication system. More particularly, the present invention relates to a method and an apparatus for a terminal controlling uplink power in the wireless communication system, comprising the steps of: configuring an uplink subframe (UL SF) of a first set and a UL SF of a second set; receiving a downlink control information (DCI) format including a bitmap for indicating transmit power control (TPC) for a plurality of terminals; and controlling transmit power of an uplink channel by using TPC information on the terminals from the bitmap, wherein the TPC information is used for controlling transmit power of an uplink channel transmitted from the UL SF of the first set when the DCI format comprises a first identifier, and the TPC information is used for controlling transmit power of an uplink channel transmitted from the UL SF of the second set when the DCI format comprises a second identifier.

Claims

1. A method for a user equipment (UE) to manage a transmission power for a random access in a wireless communication system, the method comprising:

determining a transmission power of a first physical random access preamble channel (PRACH) for a first cell group, the first cell group consisting of a primary cell (PCell) and zero or more secondary cells (SCells);

determining a transmission power of a second PRACH for a second cell group, the second cell group consisting of one or more SCells; and

transmitting the first PRACH using the transmission power determined for the first PRACH while restricting the transmission power determined for the second PRACH such that a new total transmission power of the first and second PRACHs does not exceed a threshold if a condition is satisfied, wherein the condition includes;

a total of the transmission powers determined for the first and second PRACHs exceeds the threshold due to an overlap in time between the first PRACH and the second PRACH.

2. The method of claim 1, wherein the first and second cell groups are managed by different base stations (BSs).

3. The method of claim 1, wherein a radio resource control (RRC) function associated with the UE is managed by a base station associated with the first cell group only.

4. The method of claim 1, wherein, when the first PRACH overlaps in a time domain with the second PRACH, and the total of the transmission powers determined for the first and second PRACHs exceeds the threshold, a transmission of the second PRACH is dropped.

5. The method of claim 1, wherein, when the first PRACH overlaps with the second PRACH in a time domain, and the total of the transmission powers determined for the first and second PRACHs exceeds the threshold, the transmission power determined for the second PRACH is reduced such that the new total transmission power of the first and second PRACHs does not exceed the threshold.

6. The method of claim 1, wherein the threshold is a maximum power limit.

7. A user equipment (UE) for use in a wireless communication system, the UE comprising:

a radio frequency (RF) unit configured to perform a transmission of a physical random access channel (PRACH); and

a processor configured to control the RF unit, and configured to;

determine a transmission power of a first physical random access preamble channel (PRACH) for a first cell group, the first cell group consisting of a primary cell (PCell) and zero or more secondary cells (SCells),

determine a transmission power of a second PRACH for a second cell group, the second cell group consisting of one or more SCells, and

transmit the first PRACH using the transmission power determined for the first PRACH while restricting the transmission power determined for the second PRACH such that a new total transmission power of the first and second PRACHs does not exceed a threshold if a condition is satisfied, wherein the condition includes;

a total of the transmission powers determined for the first and second PRACHs exceeds the threshold due to an overlap in time between the first PRACH and the second PRACH.

8. The UE of claim 7, wherein the first and second cell groups are managed by different base stations (BSs).

9. The UE of claim 7, wherein a radio resource control (RRC) function associated with the UE is managed by a base station associated with the first cell group only.

10. The UE of claim 7, wherein, when the first PRACH overlaps in a time domain with the second PRACH, and the total of the transmission powers determined for the first and second PRACHs exceeds the threshold, a transmission of the second PRACH is dropped.

11. The UE of claim 7, wherein, when the first PRACH overlaps in a time domain with the second PRACH, and the total of the transmission powers determined for the first and second PRACHs exceeds the threshold, the transmission power determined for the second PRACH is reduced such that the new total transmission power of the first and second PRACHs does not exceed the threshold.

12. The UE of claim 7, wherein the threshold is a maximum power limit.