PATENT CLAIM ANALYSIS

Application Number: 16235438
Application Type: Utility
Filing Date: 2018-12
Publication Date: 2019-05
Patent Classification: ["370", "331000"]

Abstract:
The present disclosure relates to methods and apparatus for flexible, security context management during AMF changes. One aspect of the disclosure is a mechanism for achieving backward security during AMF changes. Instead of passing the current NAS key to the target AMF, the source AMF derives a new NAS key, provides the new NAS key to the target AMF, and sends a key change indication to the UE, either directly or through some other network node. The UE can then derive the new NAS key from the old NAS key. In some embodiments, the AMF may provide a key generation parameter to the UE to use in deriving the new NAS key. In other embodiments, the target AMF may change one or more security algorithms.

Claim (Index 1):
A method for transferring a security context during a handover of a user equipment, the method implemented by one or more core network nodes in a core network of the wireless communication network, wherein the one or more core network nodes provide a source mobility management function, the method comprising:\n receiving, from a source base station in an access network of the wireless communication network, a first handover message indicating that a handover of a user equipment is needed; determining that an operator specific policy is met; generating a new non-access stratum key responsive to determining the operator specific policy is met; sending, responsive to the handover message, the new non-access stratum key to a target mobility management function in the core network of the wireless communication network; and sending, in a second handover message, a key change indication to the user equipment, the key change indication indicating a change of the non-access stratum key.

Metadata:
- Claim Count in Document: 47.0
- Percentile: 98.0
- Lexical Diversity: 2.09091
- Patent Class: 370.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: False
- Related Applications: ['16235523', '16235632', '15787575', '14667099', '13103333']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.5919100184838774
- 35 USC 102 Novelty (BERT): 0.6630434346102771
- Combined Prediction Score: 0.5990233600965174
- Mean Citation Score: 438.56358200000005
- Max Citation Score: 679.70087
- Similarity Product: 624.2196486443997

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 0
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test