Method and apparatus for requesting system information

Patent metadata

Field	Value
Publication number	US-2019166622-A1
Application number	US-201916261876-A
Country	US
Kind code	A1
Filing date	Jan 30, 2019
Priority date	Feb 1, 2017
Publication date	May 30, 2019
Grant date	—

Abstract

Provided are a method for a user equipment (UE) to request system information in a wireless communication system and a device supporting the same. The method may include: transmitting a random access preamble for requesting system information to a base station (BS); receiving, from the BS, a random access response including only a random access preamble identifier (RAPID) corresponding to the transmitted random access preamble; and considering that a random access procedure is completed.

First claim

1 - 15 . (canceled)

16 . A method for requesting, by a user equipment (UE), system information in a wireless communication system, the method comprising:
transmitting a random access preamble, to a base station (BS), for requesting system information; and receiving, from the BS, a random access response (RAR) message including a medium access control (MAC) subheader, wherein the MAC subheader comprises a random access preamble identifier (RAPID) corresponding to the transmitted random access preamble for requesting system information, wherein the RAR message comprises no MAC RAR corresponding to the RAPID, and wherein a random access procedure is completed when the RAR message is received.

17 . The method of claim 16 , wherein the RAR message does not include an uplink grant corresponding to the RAPID.

18 . The method of claim 16 further comprising:
transmitting, to a higher layer, an indication that an acknowledgement (ACK) of a request for the system information has been received.

19 . The method of claim 18 , wherein the RAR message constitutes the ACK of the request for the system information.

20 . The method of claim 16 , wherein the RAR message is received from the BS via a MAC PDU.

21 . The method of claim 16 , wherein the RAR message is received in a RAR window configured for receiving the RAR message.

22 . The method of claim 16 further comprising:
checking whether the requested system information is broadcast.

23 . The method of claim 22 further comprising:
receiving the requested system information.

24 . A user equipment (UE) requesting system information in a wireless communication system, the UE comprising:
a memory; a transceiver; and a processor, operatively connected with the memory and the transceiver, wherein the processor is configured to: control the transceiver to transmit, to a base station (BS), a random access preamble for requesting system information; control the transceiver to receive, from the BS, a random access response (RAR) message including a medium access control (MAC) subheader, wherein the MAC subheader comprises a random access preamble identifier (RAPID) corresponding to the transmitted random access preamble for requesting system information, wherein the RAR message comprises no MAC RAR corresponding to the RAPID, and wherein a random access procedure is completed when the RAR message is received.

25 . The UE of claim 24 , wherein the RAR message does not include an uplink grant corresponding to the RAPID.

26 . The UE of claim 24 , wherein the processor is further configured to:
control the transceiver to transmit, to a higher layer, an indication that an acknowledgement (ACK) of a request for the system information has been received.

27 . The UE of claim 26 , wherein the RAR message constitutes the ACK of the request for the system information.

28 . The UE of claim 24 , wherein the RAR message is received from the BS via a MAC PDU.

29 . The UE of claim 24 , wherein the RAR message is received in a RAR window configured for receiving the RAR message.

30 . The UE of claim 24 , wherein the processor is further configured to:
check whether the requested system information is broadcast.

31 . The UE of claim 30 , wherein the processor is further configured to:
control the transceiver to receive the requested system information.

Assignees

• Lg Electronics Inc

Inventors

• Kim Sangwon
• Lee Youngdae
• Lee Jaewook

Classifications

• H04W24/02

  Arrangements for optimising operational condition · CPC title

• H04W48/14

  using user query {or user detection} · CPC title

• H04W48/10 Primary

  using broadcasted information · CPC title

• H04W74/004 Primary

  in the uplink, i.e. towards network · CPC title

• H04W74/006

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