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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
First Claim
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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.

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