Method and device for receiving system information

Patent metadata

Field	Value
Publication number	US-2019268831-A1
Application number	US-201716347320-A
Country	US
Kind code	A1
Filing date	Nov 3, 2017
Priority date	Nov 4, 2016
Publication date	Aug 29, 2019
Grant date	—

Abstract

Provided are a method for a terminal to receive system information in a wireless communication system and a device supporting the method. The method may comprise: a step of entering a first radio resource control (RRC) state; a step of transmitting, to a base station, an RRC state transition request message requesting a state transition of a terminal from the first RRC state to a second RRC state, the RRC state transition request message including a cause value indicating a request for system information; and a step of receiving, in response to the RRC state transition request message, a rejection message including the requested system information from the base station with respect to the first RRC state.

First claim

1 . A method for receiving system information by a user equipment (UE) in a wireless communication system, comprising:
entering a first radio resource control (RRC) state; transmitting an RRC state transition request message requesting a state transition for the UE from the first RRC to a second radio resource control (RRC) state to a base station, wherein the RRC state transition request message includes a cause value indicating a request for system information; and in response to the RRC state transition request message, receiving a reject message including the requested system information for the first RRC state from the base station.

2 . The method of claim 1 , wherein the RRC state transition request message indicates to the base station that the system information is requested by the UE.

3 . The method of claim 2 , wherein, if the RRC state transition request message indicates to the base station that the system information is requested by the UE, the reject message includes system information being requested for the first RRC state.

4 . The method of claim 1 , if the RRC state transition request message includes a cause value indicating the request for the system information, the reject message is transmitted to the UE from the base station in correspondence with the cause value.

5 . The method of claim 1 , wherein the RRC state transition request message is used for requesting system information related to the first RRC state.

6 . The method of claim 1 , wherein the first RRC state corresponds to an RRC_IDLE state, the second RRC state corresponds to an RRC_CONNECTED state, the RRC state transition request message corresponds to an RRC connection request message, and the reject message corresponds to an RRC connection reject message.

7 . The method of claim 1 , wherein the first RRC state corresponds to an RRC_INACTIVE state, the second RRC state corresponds to an RRC_ACTIVE state, the RRC state transition request message corresponds to an RRC connection resume request message, and the reject message corresponds to an RRC connection resume reject message.

8 . The method of claim 1 , further comprising:
if a reject message including the requested system information for the first RRC state is received from the base station, storing the requested system information for the RRC state, wherein the first RRC state is maintained.

9 . The method of claim 1 , wherein system information included in the reject message indicates that the system information is system information corresponding to the first RRC state.

10 . The method of claim 1 , wherein system information included in the reject message is considered to be valid only in the first RRC state.

11 . The method of claim 10 , wherein, if the first RRC state corresponds to an RRC_INACTIVE state, system information included in the reject message is considered to be valid in cells belonging to the same radio access network (RAN) based area, and
wherein the RAN based area corresponds to an area that is used for UE mobility of the RRC_INACTIVE state.

12 . The method of claim 10 , wherein, if the first RRC state corresponds to an RRC_IDLE state, system information included in the reject message is considered to be valid in cells belonging to the same core network (CN) based area, and
wherein the CN based area corresponds to an area that is used for UE mobility of the RRC_IDLE state.

13 . A user equipment (UE) receiving system information in a wireless communication system, comprising:
a memory; a transceiver; and a processor operatively connecting the memory and the transceiver, wherein the processor is configured: to enter a first radio resource control (RRC) state, to control the transceiver so as to transmit an RRC state transition request message requesting a state transition for the UE from the first RRC to a second radio resource control (RRC) state to a base station, wherein the RRC state transition request message includes a cause value indicating a request for system information, and to control the transceiver so as to receive a reject message including the requested system information for the first RRC state from the base station, in response to the RRC state transition request message.

14 . The user equipment of claim 13 , wherein the RRC state transition request message indicates to the base station that the system information is requested by the UE.

15 . The user equipment of claim 13 , wherein, if the RRC state transition request message includes a cause value indicating the request for the system information, the reject message is transmitted to the UE from the base station in correspondence with the cause value.

16 . The method of claim 1 , wherein the UE communicates with at least one of a mobile terminal, a network or autonomous vehicles other than the UE.

Assignees

• Lg Electronics Inc

Inventors

• Lee Youngdae
• Kim Sangwon
• Lee Jaewook

Classifications

• H04W48/02

  Access restriction performed under specific conditions · CPC title

• H04W76/27

  Transitions between radio resource control [RRC] states · CPC title

• H04W76/18

  Management of setup rejection or failure · CPC title

• H04W48/14 Primary

  using user query {or user detection} · CPC title

• H04W88/023

  with message or information receiving capability · CPC title