Method, device, and system for deriving keys
US11240019B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 2011 |
| Grant date | Feb 1, 2022 |
| Priority date | — |
| Expiry date | Dec 13, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/14
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Method, device, and system for deriving keys are provided in the field of mobile communications technologies. The method for deriving keys may be used, for example, in a handover process of a User Equipment (UE) from an Evolved Universal Terrestrial Radio Access Network (EUTRAN) to a Universal Terrestrial Radio Access Network (UTRAN). If a failure occurred in a first handover, the method ensures that the key derived by a source Mobility Management Entity (MME) for a second handover process of the UE is different from the key derived for the first handover process of the UE. This is done by changing input parameters used in the key derivation, so as to prevent the situation in the prior art that once the key used on one Radio Network Controller (RNC) is obtained, the keys on other RNCs can be derived accordingly, thereby enhancing the network security.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.