Method and apparatus for requesting additional system information

Patent metadata

Field	Value
Publication number	US-2017332372-A1
Application number	US-201715590644-A
Country	US
Kind code	A1
Filing date	May 9, 2017
Priority date	May 10, 2016
Publication date	Nov 16, 2017
Grant date	—

Abstract

Provided are a method for a user equipment (UE) to request additional system information in a wireless communication system, and an apparatus supporting the same. The method may include: transmitting a first uplink message including a system information request to a radio access network (RAN); receiving a first downlink message including requested system information from the RAN in response to the system information request; transmitting a second uplink message including an additional system information request to the RAN; and receiving requested additional system information from the RAN in response to the additional system information request.

First claim

What is claimed is:

1 . A method for a user equipment (UE) to request additional system information in a wireless communication system, the method comprising:
transmitting a first uplink message comprising a system information request to a radio access network (RAN); receiving a first downlink message comprising requested system information from the RAN in response to the system information request; transmitting a second uplink message comprising an additional system information request to the RAN; and receiving requested additional system information from the RAN in response to the additional system information request.

2 . The method of claim 1 , wherein transmission of the system information request is initiated by a radio link failure (RLF).

3 . The method of claim 1 , wherein transmission of the system information request is initiated by a handover failure (HOF).

4 . The method of claim 1 , wherein transmission of the system information request is initiated by a service request for a mobile originating (MO) signaling, MO call or mobile terminating (MT) call.

5 . The method of claim 1 , wherein transmission of the system information request is initiated by a tracking area update or an attach request.

6 . The method of claim 1 , wherein when the first uplink message has a size which is not sufficient to comprise the additional system information request, the additional system information request is transmitted to the RAN via the second uplink message.

7 . The method of claim 1 , wherein the system information request further comprises information indicating that the additional system information request is to be transmitted.

8 . The method of claim 1 , wherein the system information received by the system information request is system information set higher in priority than the additional system information received by the additional system information request.

9 . The method of claim 1 , wherein the first uplink message is a radio resource control (RRC) connection request message, the first downlink message is an RRC connection setup message, and the second uplink message is an RRC connection setup complete message.

10 . The method of claim 1 , wherein the first uplink message is an RRC connection resume request message, the first downlink message is an RRC connection resume message, and the second uplink message is an RRC connection resume complete message.

11 . The method of claim 1 , wherein the first uplink message is an RRC connection re-establishment request message, the first downlink message is an RRC connection re-establishment message, and the second uplink message is an RRC Connection re-establishment complete message.

12 . A user equipment (UE) requesting additional system information in a wireless communication system, the UE comprising:
a memory; a transceiver; and a processor configured to connect the memory and the transceiver, wherein the processor is configured to control the transceiver to: transmit a first uplink message comprising a system information request to a radio access network (RAN); receive a first downlink message comprising requested system information from the RAN in response to the system information request; transmit a second uplink message comprising an additional system information request to the RAN; and receive requested additional system information from the RAN in response to the additional system information request.

13 . The UE of claim 12 , wherein transmission of the system information request is initiated by a radio link failure (RLF).

14 . The UE of claim 12 , wherein transmission of the system information request is initiated by a handover failure (HOF).

15 . The UE of claim 12 , wherein when the first uplink message has a size which is not sufficient to comprise the additional system information request, the additional system information request is comprised in the second uplink message and transmitted to the RAN.

Assignees

• Lg Electronics Inc

Inventors

• Lee Youngdae
• Kim Sangwon
• Lee Jaewook

Classifications

• H04W72/543

  based on requested quality, e.g. QoS · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W72/542

  using measured or perceived quality · CPC title

• H04W76/10

  Connection setup · CPC title