×

Apparatus and method for performing uplink synchronization in wireless communication system

  • US 9,655,071 B2
  • Filed: 09/23/2014
  • Issued: 05/16/2017
  • Est. Priority Date: 05/27/2011
  • Status: Active Grant
First Claim
Patent Images

1. A method of performing an uplink synchronization by a base station (BS) in a wireless communication system, the method comprising:

  • transmitting configuration information to a user equipment (UE), the configuration information including timing advanced group (TAG) information indicating serving cells in which a timing advanced value (TAV) is applied;

    transmitting random access preamble (RAP) allocation information to the UE, the RAP allocation information including a RAP index that indicates one preamble sequence selected from at least one dedicated RAP for a non-contention based random access procedure;

    receiving a message including the preamble sequence; and

    transmitting a random access response (RAR) to the UE, the RAR including a medium access control (MAC) protocol data unit (PDU),wherein the MAC PDU comprises a header and a MAC control element (CE),wherein the header includes a logical channel identifier (LCID) that indicates whether the MAC CE includes a timing advanced command (TAC) field, andwherein the MAC CE includes a TAC field indicating a TAV and a TAG index field identifying a TAG to control uplink timing adjustment identically with the TAV, the TAC field being a 6-bit value, and the TAG index field being a 2-bit value.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×