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1. (WO2018178075) WIRELESS TELECOMMUNICATIONS APPARATUS AND METHODS

Pub. No.:    WO/2018/178075    International Application No.:    PCT/EP2018/057768
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Wed Mar 28 01:59:59 CEST 2018
IPC: H04W 12/04
H04W 36/02
H04L 29/06
H04W 92/10
Applicants: SONY CORPORATION
SONY EUROPE LIMITED
Inventors: SHARMA, Vivek
BEALE, Martin Warwick
WONG, Shin Horng
MARTIN, Brian Alexander
Title: WIRELESS TELECOMMUNICATIONS APPARATUS AND METHODS
Abstract:
A first network access node (206) for use in association with a handover procedure for a terminal device (208) involving the first network access node (206) and a second network access node (204) in a wireless telecommunications network comprising the first network access node (206), the second network access node (204), the terminal device (208), and a core network part, wherein the first network access node (206) comprises controller circuitry and transceiver circuitry configured to operate together such that the first network access node (206) is operable to: receive a block of uplink data from the terminal device (208); establish whether the block of data has been ciphered by the terminal device (208) using a cipher key corresponding to a first cipher key associated with the first network access node (206) or corresponding to a second cipher key associated with the second network access node (204); in response to establishing the block of data has been ciphered using a cipher key corresponding to the first cipher key (206), decipher the block of data using the first cipher key, and to forward the deciphered block of data to the core network part; and in response to establishing the block of data has been ciphered using a cipher key corresponding to the second cipher key, forward the block of data to the second network access node (204).