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Why does HSS generate multiple authentication vectors during the authentication procedure ?

+4 votes

Is it the wish of HSS or MME or UE ?

posted Dec 26, 2015 by Vikram Singh

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1 Answer

+1 vote

HSS generate multiple authentication vector as it has been asked from MME .

MME can ask authentication vector in between 1 to 5 in one short from hss. After that MME will keep those authentication vector in its context w.r.t to time. As the time elapsed MME will refresh its authentication vector context.

KSI ( Key set identifier ) table will be maintained at MME to store all KASME OR K'ASME along with dl/ul count , GUTI,

AVP structure used by MME to ask for EPS vectors
Requested- EUTRAN-Authentication-Info ::=

**[ Number-Of-Requested-Vectors]**( This parameter tells how many authentication vector hss has to send back to MME , if nothing is mention in this then hss will only send one authentication vector to MME.

                     [ Immediate-Response-Preferred ]
                     [ Re-synchronization-Info ]

The reason of asking for multiple authentication vector is to reduce the communication between MME and HSS.

for more details . one can refer it .

answer Dec 28, 2015 by Pankaj Kumar
To decrease the signalling