Apparatus and method for performing uplink synchronization in wireless communication system
First Claim
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.
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Accused Products
Abstract
This specification relates to an apparatus and method for performing random access in a wireless communication system. This specification discloses a mobile station, including a reception unit for receiving TAG configuration information on which at least one serving cell configured in the mobile station is classified as a Timing Alignment Group (TAG) from a base station and a transmission unit for transmitting a random access preamble to the base station on one representative serving cell within the TAG. In accordance with this specification, a procedure of obtaining a TAV for a serving cell in order to secure and maintain uplink timing synchronization becomes clear, the time taken to obtain uplink synchronization for a serving cell may be reduced, and overhead due to excessive random access attempts may be reduced by obtaining a TAV for a plurality of serving cells through one random access procedure.
11 Citations
8 Claims
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1. A method of performing an uplink synchronization by a base station (BS) in a wireless communication system, the method comprising:
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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, and wherein 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 Dependent Claims (2, 3, 4)
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5. A method of performing an uplink synchronization by a User Equipment (UE) in a wireless communication system, the method comprising:
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receiving configuration information, the configuration information including timing advanced group (TAG) information indicating serving cells in which a timing advanced value (TAV) is applied; receiving random access preamble (RAP) allocation information, 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; transmitting a message including the preamble sequence to a base station (BS); and receiving a random access response (RAR), 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, and wherein 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 Dependent Claims (6, 7, 8)
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Specification