The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 12, 2022
Filed:
Jul. 08, 2019
Nec Corporation, Tokyo, JP;
Xiaowei Zhang, Tokyo, JP;
Anand Raghawa Prasad, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
A root key (K_iwf) is derived at a network and sent to MTC UE (). The K_iwf is used for deriving subkeys for protecting communication between MTC UE () and MTC-IWF (). In a case where HSS () derives the K_iwf, HSS () send to MTC-IWF () the K_iwf in a new message (Update Subscriber Information). In a case where MME () derives the K_iwf, MME () sends the K_iwf through HSS () or directly to MTC-IWF (). MTC-IWF () can derive the K_iwf itself. The K_iwf is sent through MME () to MTC UE () by use of a NAS SMC or Attach Accept message, or sent from MTC-IWF () directly to MTC UE (). In a case where the K_iwf is sent from MME (), MME () receives the K_iwf from HSS () in an Authentication Data Response message, or from MTC-IWF () directly.