Management of security contexts at idle mode mobility between different wireless communication systems
AssigneeTelefon Aktiebolaget LM Ericsson (Publ)
InventorsChristine Jost, Noamen Ben Henda, Vesa Torvinen, Monica Wifvesson
Life of this patent
Estimating the term…
Abstract
There is provided a solution for managing security contexts at idle mode mobility of a wireless communication device between different wireless communication systems including a first wireless communication system and a second wireless communication system. The first wireless communication system is a 5G/NGS system and the second wireless communication system is a 4G/EPS system. The solution is based on obtaining (S1) a 5G/NGS security context, and mapping (S2) the 5G/NGS security context to a 4G/EPS security context.
Claims21
An apparatus configured to manage security contexts at idle mode mobility of a wireless communication device between a 5G/NGS system and a 4G/EPS system, wherein the 5G/NGS system is a source system and the 4G/EPS system is a target system during idle mode mobility, the apparatus being configured to:
- receive from a Mobility Management Entity (MME) a Context Request message comprising a key set identifier that identifies a 5G/NGS security context;
- after receiving the Context Request message from the MME, obtain the 5G/NGS security context, wherein the 5G/NGS security context includes at least one 5G/NGS security key;
- and
- map the 5G/NGS security context to a 4G/EPS security context, wherein the apparatus is configured to map the 5G/NGS security context to the 4G/EPS security context by performing a process that includes deriving at least one 4G/EPS security key based on one or more of the 5G/NGS security key(s), wherein the 4G/EPS security context comprises the 4G/EPS security key(s);
- and
- after deriving the 4G/EPS security key(s), transmitting to the MME a Context Response message responsive to the Context Request message, wherein the Context Response message comprises the at least one 4G/EPS security key.
A method for managing security contexts at idle mode mobility of a wireless communication device between a 5G/Next Generation System (5G/NGS) system and a 4G/Evolved Packet System (4G/EPS) system, wherein the 5G/NGS system is a source system and the 4G/EPS system is a target system during idle mode mobility, the method comprising:
- obtaining a 5G/NGS security context, wherein the 5G/NGS security context includes at least one 5G/NGS security key;
- mapping the 5G/NGS security context to a 4G/EPS security context, wherein mapping the 5G/NGS security context to the 4G/EPS security context comprises deriving at least one 4G/EPS security key based on one or more of the 5G/NGS security key(s), and the 4G/EPS security context comprises the derived 4G/EPS security key(s);
- prior to obtaining the 5G/NGS security context key and mapping the 5G/NGS security context to the 4G/EPS security context, receiving from a Mobility Management Entity (MME) a Context Request message comprising a key set identifier that identifies the 5G/NGS security context;
- and
- after receiving the Context Request message and after deriving the at least one 4G/EPS security key, transmitting to the MME a Context Response message responsive to the Context Request message, wherein the Context Response message comprises the at least one 4G/EPS security key.
Dependencies are inferred from the claim text.