Method for random access, user equipment and base station

Patent metadata

Field	Value
Publication number	US-2019342925-A1
Application number	US-201716474355-A
Country	US
Kind code	A1
Filing date	Dec 7, 2017
Priority date	Jan 6, 2017
Publication date	Nov 7, 2019
Grant date	—

Abstract

Embodiments of the present invention provide a method for RACH re-attempt, a user equipment and a base station. The method comprises the steps of: by a base station, determining system configuration information and transmitting the system configuration information to a user equipment; and then, by the user equipment, transmitting a preamble sequence to perform random access, and if the random access is failed, performing RACH attempt according to the received RACH re-attempt configuration information to perform random access until a preset decision condition is satisfied. The embodiment of the present invention is used for RACH re-attempt when random access fails.

First claim

1 .- 14 . (canceled)

15 . A method of transmitting a signal by a terminal in a wireless communication system, the method comprising:
determining a first transmission power for a transmission of a random access preamble; transmitting, to a base station, the random access preamble by using the first transmission power; determining whether to increase a first counter for a preamble power ramping; and transmitting, to the base station, the random access preamble by using the first transmission power, in case that the first counter is not increased.

16 . The method of claim 15 , wherein the first counter is not increased when at least one of a transmission beam for the retransmission or a random access resource for the retransmission is changed.

17 . The method of claim 15 , wherein the method further comprises transmitting, to the base station, the random access preamble by using a second transmission power, and
wherein the second transmission power is increased from the first transmission power by increasing the first counter.

18 . The method of claim 17 , wherein the first counter is increased when a transmission beam for the retransmission is not changed and a random access resource for the retransmission is not changed.

19 . The method of claim 15 , wherein a second counter for a preamble transmission is increased for each random access preamble transmission.

20 . A method of receiving a signal by a base station in a wireless communication system, the method comprising:
receiving, from a terminal, a transmission of a random access preamble by using a first transmission power; and receiving, from the terminal, a retransmission of the random access preamble by using the first transmission power, wherein a transmission power for the random access preamble is identified by determining whether to increase a first counter for a preamble power ramping, and wherein the retransmission of the random access preamble is received by using the first transmission power, in case that the first counter is not increased.

21 . The method of claim 20 , wherein the first counter is not increased when at least one of a transmission beam for the retransmission or a random access resource for the retransmission is changed.

22 . The method of claim 20 , wherein the method further comprises receiving, from the terminal, the random access preamble by using a second transmission power, and wherein the second transmission power is increased from the first transmission power by increasing the first counter.

23 . The method of claim 22 , wherein the first counter is increased when a transmission beam for the retransmission is not changed and a random access resource for the retransmission is not changed.

24 . The method of claim 20 , wherein a second counter for a preamble transmission is increased by the terminal for each random access preamble transmission.

25 . A terminal of transmitting a signal in a wireless communication system, the terminal comprising:
a transceiver to be configured to transmit and receive a signal; and a processor to be configured to:
determine a first transmission power for a transmission of a random access preamble,
transmit, to a base station, the random access preamble by using the first transmission power,
determine whether to increase a first counter for a preamble power ramping, and
transmit, to the base station, the random access preamble by using the first transmission power, in case that the first counter is not increased.

26 . The terminal of claim 25 , wherein the first counter is not increased when at least one of a transmission beam for the retransmission or a random access resource for the retransmission is changed.

27 . The terminal of claim 25 , wherein the processor is further configured to transmit, to the base station, the random access preamble by using a second transmission power, and
wherein the second transmission power is increased from the first transmission power by increasing the first counter.

28 . The terminal of claim 27 , wherein the first counter is increased when a transmission beam for the retransmission is not changed and a random access resource for the retransmission is not changed.

29 . The terminal of claim 25 , wherein a second counter for a preamble transmission is increased for each random access preamble transmission.

30 . A base station of receiving a signal in a wireless communication system, the base station comprising:
a transceiver to be configured to transmit and receive a signal; and a processor to be configured to:
receive, from a terminal, a transmission of a random access preamble by using a first transmission power, and
receive, from the terminal, a retransmission of the random access preamble by using the first transmission power,
wherein a transmission power for the random access preamble is identified by determining whether to increase a first counter for a preamble power ramping, and wherein the retransmission of the random access preamble is received by using the first transmission power, in case that the first counter is not increased.

31 . The base station of claim 30 , wherein the first counter is not increased when at least one of a transmission beam for the retransmission or a random access resource for the retransmission is changed.

32 . The base station of claim 30 , wherein the processor is further configured to receive, from the terminal, the random access preamble by using a second transmission power, and
wherein the second transmission power is increased from the first transmission power by increasing the first counter.

33 . The base station of claim 32 , wherein the first counter is increased when a transmission beam for the retransmission is not changed and a random access resource for the retransmission is not changed.

34 . The base station of claim 30 , wherein a second counter for a preamble transmission is increased by the terminal for each random access preamble transmission.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Zhang Yingjie
• Yu Bin
• Qian Chen
• Su Di
• Xiong Qi
• Fu Jingxing

Classifications

• H04W52/42

  in systems with time, space, frequency or polarisation diversity · CPC title

• H04W52/50 Primary

  at the moment of starting communication in a multiple access environment · CPC title

• H04W74/0841 Primary

  with collision treatment · CPC title

• H04W52/146

  Uplink power control · CPC title

• H04W74/006

  in the downlink, i.e. towards the terminal · CPC title