Apparatus and method for performing random access in beam-formed system
AssigneeSamsung Electronics Co., Ltd.
InventorsAnil Agiwal, Youngbin Chang, Nigam Anshuman
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Abstract
A method for performing a random access is provided. The method includes identifying a first downlink (DL) reception (RX) beam based on a measurement on a beam measurement signal, identifying a first uplink (UL) transmission (TX) beam corresponding to the identified first DL RX beam and transmitting at least one random access preamble for an RX sweeping at a base station, using the identified first UL TX beam based on a first power.
Claims18
A method performed by a terminal in a wireless communication system, the method comprising:
- transmitting, to a base station, a first random access preamble using a first transmission beam based on a first power;
- identifying whether a random access response is received from the base station as a response to the first random access preamble;
- identifying whether a second transmission beam is changed from the first transmission beam, in case that the random access response is not received;
- in case that the second transmission beam is not changed, incrementing a counter associated with preamble transmission power ramping, identifying a second power for transmitting a second random access preamble based on the counter, and transmitting the second random access preamble using the first transmission beam based on the second power;
- and
- in case that the second transmission beam is changed, transmitting, to the base station, the second random access preamble using the second transmission beam based on the first power.
A terminal in a wireless communication system, the terminal comprising:
- a transceiver;
- and
- at least one processor configured to:
- transmit, to a base station via the transceiver, a first random access preamble using a first transmission beam based on a first power,
- identify whether a random access response is received from the base station as a response to the first random access preamble,
- identify whether a second transmission beam is changed from the first transmission beam, in case that the random access response is not received,
- in case that the second transmission beam is not changed, increment a counter associated with preamble transmission power ramping, identify a second power for transmitting a second random access preamble based on the counter, and transmit, to the base station via the transceiver, the second random access preamble using the first transmission beam based on the second power, and
- in case that the second transmission beam is changed, transmit, to the base station via the transceiver, the second random access preamble using the second transmission beam based on the first power.
Dependencies are inferred from the claim text.