US Patent No. 9,473,933

KEY ISOLATION METHOD AND DEVICE


Patent No. 9,473,933
Issue Date October 18, 2016
Title Key Isolation Method And Device
Inventorship Yi Yang, Beijing (CN)
Jing Liang, Beijing (CN)
Assignee China Academy of Telecommunications Technology, Beijing (CN)

Claim of US Patent No. 9,473,933

1. A key isolation method, comprising:
generating, by a macro base station, a key for use in communication of a destination base station with a User Equipment, UE,
from a distinguishing parameter of the destination base station and a temporary key shared by the macro base station with
the UE, upon deciding user plane bearers of the UE to be handed over; and

transmitting, by the macro base station, the distinguishing parameter to the UE so that the UE generates the key for use in
communication of the UE with the destination base station from the distinguishing parameter, and the temporary key shared
by the UE with the macro base station;

wherein the destination base station is a destination local base station; and
if the macro base station decides the user plane bearers of the UE to be handed over from the macro base station to the destination
local base station or decides the user plane bearers of the UE to be handed over from a local base station where the UE is
currently located to the destination local base station, then the method further comprises:

transmitting the generated key to the destination local base station;
wherein the macro base station has the entire user plane and control plane protocol stacks, and the local base station has
the entire user plane protocol stack and a part of the Radio Resource Control (RRC) protocol function.