Method and apparatus for performing random access in a mobile communication system
First Claim
1. A method by a terminal communicating with a master base station and a secondary base station, the method comprising:
- receiving, from a master base station, a message to add a cell of a secondary cell group (SCG) associated with a secondary base station, the message including configuration information related to the SCG;
adding the cell for the SCG based on the message;
identifying whether the configuration information related to the SCG includes mobility control information related to the SCG;
starting a timer with a timer value included in the mobility control information related to the SCG based on the configuration information including the mobility control information related to the SCG;
starting synchronizing to a downlink of a primary secondary cell (PSCell) based on the configuration information including the mobility control information related to the SCG;
initiating a random access procedure on the PSCell based on preamble information included in the mobility control information related to the SCG based on the configuration information including the mobility control information related to the SCG; and
transmitting, to the master base station, a response message in response to the message,wherein the timer is stopped in response to the random access procedure being completed successfully.
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Abstract
The present disclosure relates to a method and apparatus for performing random access in a user equipment for a small cell e-NB with a small cell service area in heterogeneous e-NB cell carrier integration (dual connectivity or inter-eNB carrier aggregation) in mobile communication systems. In accordance with an aspect of the present disclosure, a method for performing random access in a mobile communication system is provided. The method includes receiving a configuration request message for configuring a Serving Cell Group (SCG) from a second eNB located in a service area of a first eNB through the first eNB; configuring an SCG cell based on the configuration request message, and sending a configuration response message in response to the configuration request message to the second eNB through the first eNB; and performing random access if there is uplink data present on a logic channel (LCH) relocated into the SCG cell.
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Citations
20 Claims
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1. A method by a terminal communicating with a master base station and a secondary base station, the method comprising:
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receiving, from a master base station, a message to add a cell of a secondary cell group (SCG) associated with a secondary base station, the message including configuration information related to the SCG; adding the cell for the SCG based on the message; identifying whether the configuration information related to the SCG includes mobility control information related to the SCG; starting a timer with a timer value included in the mobility control information related to the SCG based on the configuration information including the mobility control information related to the SCG; starting synchronizing to a downlink of a primary secondary cell (PSCell) based on the configuration information including the mobility control information related to the SCG; initiating a random access procedure on the PSCell based on preamble information included in the mobility control information related to the SCG based on the configuration information including the mobility control information related to the SCG; and transmitting, to the master base station, a response message in response to the message, wherein the timer is stopped in response to the random access procedure being completed successfully. - View Dependent Claims (2, 3, 4, 5)
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6. A method by a master base station communicating with a terminal and a secondary base station, the method comprising:
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transmitting, to a terminal, a message to add a cell of a secondary cell group (SCG) associated with a secondary base station, the message including configuration information related to the SCG; performing a random access procedure on a primary secondary cell (PSCell) based on preamble information; and receiving, from the terminal, a response message in response to the message, wherein a timer, which is started with a timer value included in mobility control information related to the SCG based on the configuration information including the mobility control information related to the SCG, is stopped in the terminal in response to the random access procedure being completed successfully, and wherein the terminal initiates the random access procedure on the PSCell based on the preamble information included in the mobility control information related to the SCG based on the configuration information including the mobility control information related to the SCG, wherein the terminal starts synchronizing to a downlink of the PSCell based on the configuration information including the mobility control information related to the SCG. - View Dependent Claims (7, 8, 9, 10)
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11. A terminal communicating with a master base station and a secondary base station, the terminal comprising:
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a transceiver; and a processor coupled with the transceiver and configured to; receive, from a master base station, a message to add a cell of a secondary cell group (SCG) associated with a secondary base station, the message including configuration information related to the SCG, add the cell for the SCG based on the message, identify whether the configuration information related to the SCG includes mobility control information related to the SCG, start a timer with a timer value included in the mobility control information related to the SCG based on the configuration information including the mobility control information related to the SCG, start synchronizing to a downlink of a primary secondary cell (PSCell) based on the configuration information including the mobility control information related to the SCG, initiate a random access procedure on the PSCell based on preamble information included in the mobility control information related to the SCG based on the configuration information including the mobility control information related to the SCG, and transmit, to the master base station, a response message in response to the message, wherein the timer is stopped in response to the random access procedure being completed successfully. - View Dependent Claims (12, 13, 14, 15)
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16. A master base station communicating with a terminal and a secondary base station, the master base station comprising:
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a transceiver; and a processor coupled with the transceiver and configured to; transmit, to a terminal, a message to add a cell of a secondary cell group (SCG) associated with a secondary base station, the message including configuration information related to the SCG, perform a random access procedure on a primary secondary cell (PSCell) based on preamble information, and receive, from the terminal, a response message in response to the message via the transceiver, wherein a timer, which is started with a timer value included in mobility control information related to the SCG based on the configuration information including the mobility control information related to the SCG, is stopped in the terminal in response to the random access procedure being completed successfully, and wherein the terminal initiates the random access procedure on the PSCell based on the preamble information included in the mobility control information related to the SCG based on the configuration information including the mobility control information related to the SCG, wherein the terminal starts synchronizing to a downlink of the PSCell based on the configuration information including the mobility control information related to the SCG. - View Dependent Claims (17, 18, 19, 20)
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Specification