Apparatus and method for connection re-establishment in mobile communication system

Patent metadata

Field	Value
Publication number	US-2016269952-A1
Application number	US-201415032942-A
Country	US
Kind code	A1
Filing date	Nov 5, 2014
Priority date	Nov 5, 2013
Publication date	Sep 15, 2016
Grant date	—

Abstract

The present disclosure relates to a pre-5 th -Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4 th -Generation (4G) communication system such as Long Term Evolution (LTE). The present disclosure is to perform connection re-establishment in a mobile communication system, wherein a method for operating a terminal in a mobile communication system includes: receiving, from a base station, a message informing whether to support to fetching a context of the terminal; and determining whether at least one base station supports to fetching the context based on the message. In addition, the present invention includes other embodiments as well as the above-described embodiments.

First claim

The invention claimed is:

1 . An apparatus for a terminal in a mobile communication system, the apparatus comprising:
a communication unit configured to receive, from a base station, a message informing whether to support to fetching a context of the terminal; and a controller configured to determine whether at least one base station supports to fetching the context based on the message.

2 . The apparatus of claim 1 , wherein the communication unit is further configured to receive the message which is transmitted by an adjacent base station while an radio link failure (RLF) timer is running.

3 . The apparatus of claim 1 ,
wherein, if a handover timer expires while an RLF timer is running and a target base station supports to fetching the context, the controller is further configured to control to perform a procedure for a connection re-establishment to access the target base station without transmitting a measurement report (MR).

4 . The apparatus of claim 1 ,
wherein, if a handover timer expires while an RLF timer is running, and a target base station does not support to fetching the context, the communication unit is further configured to transmit a measurement report (MR) to a serving base station, and wherein the controller is further configured to control to perform a procedure for a connection re-establishment to access the target base station.

5 . The apparatus of claim 4 , wherein the communication unit is further configured to transmit the MR through a resource which is reserved to transmit the MR without requesting a grant of an uplink resource.

6 . The apparatus of claim 4 , wherein the communication unit is further configured to:
transmit a signal for requesting to use a resource which is reserved for the MR without requesting a grant of an uplink resource, and transmit the MR through the reserved resource.

7 . The apparatus of claim 1 , wherein the communication unit is further configured to receive at least one of resource allocation information regarding a resource which is reserved for a measurement report (MR), an indicator indicating a rule of using the reserved resource, and allocation information for a random access code allocated to request to use the reserved resource.

8 . The apparatus of claim 1 ,
wherein, if a handover timer expires while a radio link failure (RLF) timer is running and a target base station does not support to fetching the context, the controller is further configured to control to:
attempt to transmit a measurement report (MR) to a serving base station,
if at least one predefined condition is satisfied while transmission of the MR is attempted, stop transmitting the MR, and
perform a procedure for generating a context and a procedure for a connection establishment to access the target base station.

9 . An apparatus for a base station in a mobile communication system, the apparatus method comprising:
a controller configured to generate a message informing whether at least one base station supports to fetching a context; and a wireless communication unit configured to transmit the message.

10 . The apparatus of claim 9 , wherein the wireless communication unit is further configured to transmit at least one of resource allocation information regarding a resource which is reserved for a measurement report (MR), an indicator indicating a rule of using the reserved resource, and allocation information for a random access code allocated to request to use of the reserved resource.

11 . The apparatus of claim 9 ,
wherein the controller is further configured to allocate a resource reserved for a measurement report (MR) to a terminal, and wherein the wireless communication unit receiving the MR through the reserved resource.

12 . The apparatus of claim 11 ,
wherein the wireless communication unit is further configured to receiving a signal for requesting to use the reserved resource, and wherein the controller is further configured to control to empty the reserved resource.

13 . The apparatus of claim 9 ,
wherein, if a connection re-establishment request from a terminal that a context is not stored occurs, the controller is further configured to control to acquire the context of the terminal by fetching the context.

14 . The apparatus of claim 9 , wherein the message indicates one of whether the base station supports to fetching the context, whether base stations included in an unit area where the base station belongs support to fetching the context, whether at least one adjacent base station of the base station supports to fetching the context, and whether subordinate pico base stations having coverage overlaid with the base station support to fetching the context.

15 . (canceled)

16 . The apparatus of claim 1 , wherein the message indicates one of whether the base station supports to fetching the context, whether base stations included in an unit area where the base station belongs support to fetching the context, whether at least one adjacent base station of the base station supports to fetching the context, and whether subordinate pico base stations having coverage overlaid with the base station support to fetching the context.

17 . A method for operating a terminal in a mobile communication system, the method comprising:
receiving, from a base station, a message informing whether to support to fetching a context of the terminal; and determining whether at least one base station supports to fetching the context based on the message.

18 . The method of claim 17 , wherein the message indicates one of whether the base station supports to fetching the context, whether base stations included in an unit area where the base station belongs support to fetching the context, whether at least one adjacent base station of the base station supports to fetching the context, and whether subordinate pico base stations having coverage overlaid with the base station support to fetching the context.

19 . The method of claim 17 , wherein the receiving the message comprises receiving the message which is transmitted by an adjacent base station while an radio link failure (RLF) timer is running.

20 . The method of claim 17 , further comprising:
if a handover timer expires while a radio link failure (RLF) timer is running and a target base station supports to fetching the context, performing a procedure for a connection re-establishment to access the target base station without transmitting a measurement report (MR).

21 . The method of claim 17 , further comprising:
if a handover timer expires while a radio link failure (RLF) timer is running, and a target base station does not support to fetching the context, transmitting a measurement report (MR) to a serving base station; and performing a procedure for a connection re-establishment to access the target base station.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Moon Jung-Min
• Lee Sung-Jin
• Jung Jung-Soo
• Ryoo Sun-Heui

Classifications

• H04W36/0061

  of neighbour cell information · CPC title

• H04W36/04

  Reselecting a cell layer in multi-layered cells · CPC title

• H04W36/305

  Handover due to radio link failure (control signalling for hand-off failure H04W36/0079) · CPC title

• H04W76/19

  Connection re-establishment · CPC title

• H04W76/18

  Management of setup rejection or failure · CPC title