×

Apparatus and method for performing uplink synchronization in wireless communication system

  • US 8,848,674 B2
  • Filed: 05/25/2012
  • Issued: 09/30/2014
  • Est. Priority Date: 05/27/2011
  • Status: Active Grant
First Claim
Patent Images

1. A user equipment (UE) performing an uplink synchronization in a wireless communication system, the UE comprising:

  • a receiving unit configured for receiving a medium access control (MAC) protocol data unit (PDU) from a base station (BS); and

    a MAC processing unit configured for;

    identifying that the MAC PDU includes a MAC header and a MAC control element (CE);

    obtaining, from the MAC header, a subheader;

    obtaining, from the subheader, a logical channel identifier (LCID) indicating an index to identify whether the MAC CE is for timing advance command (TAC);

    obtaining, from the MAC CE, a TAC field with 6 bits indicating a timing alignment value (TAV) and a timing alignment group (TAG) index field with 2 bits identifying a TAG to control uplink timing adjustment identically with the TAV;

    identifying the TAG to which the TAV is applied based on the TAG index field; and

    controlling the uplink timing adjustment for at least one serving cell in the identified TAG.

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