Apparatus and method for random access in wireless communication system
AssigneeSamsung Electronics Co., Ltd.
InventorsNeung Hyung Lee, Soeng Hun Kim, Sung Oh Kwon
Life of this patent
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Abstract
A method and an apparatus are provided that transmit and receive a random access preamble in a wireless communication system. A plurality of random access parameters having different values in accordance with a plurality of events for triggering random access are set. When one of the plurality of events for triggering random access has occurred, random access is performed according to at least one of the plurality of random access parameters corresponding to the event. Therefore, the time delay of random access can be reduced.
Claims9
A method for random access of user equipment, comprising the steps of:
- setting a plurality of random access parameters having different values in accordance with a plurality of events for triggering random access;
- and
- when one of the plurality of events for triggering random access has occurred, performing random access according to at least one of the plurality of random access parameters corresponding to the event,
- wherein the plurality of random access parameters include initial transmission power parameters and ramping power parameters, and
- performing the random access comprises:
- transmitting a preamble using a transmission power corresponding to an initial transmission power parameter corresponding to the event;
- and
- when a response corresponding to the preamble has not been received, increasing the transmission power by a ramping power corresponding to a ramping power parameter corresponding to the event and re-transmitting the preamble using the increased transmission power, and
- wherein the initial transmission power parameter corresponding to one of a handover event and an uplink or downlink data resume event is greater than the initial transmission power parameter corresponding to one of an idle to connected mode transition event and a Radio Resource Control (RRC) connection re-establishment event.
An apparatus for random access in a user equipment, comprising:
- a storage unit for storing a plurality of random access parameters that differ from each other according to a plurality of events for triggering random access;
- a random access preamble configuration unit for generating a random access preamble when one of the plurality of events for triggering random access has occurred;
- a user equipment communication unit for transmitting the random access preamble;
- and
- a random access preamble power controller for controlling transmission power of the random access preamble according to at least one of the plurality of random access parameters stored in the storage unit,
- wherein the plurality of random access parameters include initial transmission power parameters and ramping power parameters, and
- wherein the user equipment communication unit transmits a preamble using a transmission power corresponding to an initial transmission power parameter corresponding to the event,
- wherein when a response corresponding to the preamble has not been received, the random access preamble power controller increases the transmission power by a ramping power corresponding to a ramping power parameter corresponding to the event and the user equipment communication unit re-transmits the preamble using the increased transmission power, and
- wherein the initial transmission power parameter corresponding to one of a handover event and an uplink or downlink data resume event is greater than the initial transmission power parameter corresponding to one of an idle to connected mode transition event and a Radio Resource Control (RRC) connection re-establishment event.
Dependencies are inferred from the claim text.