Why the answer of number 9 and 10 is "None of the above"?
9: All statements are correct. None is false. so correct is "None of the above"10: RoHC is used to compress/decompress IP/UDP/RTP headers over radio interface. So no statement is true
GTP itself doesn't provide mobility and security. Mobility is managed by MME and eNB with eNB, SGW and PGw providing TEID values while GTP-c itself is merely the transport protocol used to carry message and doesn't "provide mobility" itself (unlike Mobile IP which is both a tunnel protocol and a mobility solution). Likewise, GTP itself has no role in security, for example, key management for the IPsec tunnel transporting GTP-U between eNB and SGW is not a function of GTP itself and the GTP tunnels themselves are not encrypted.
Any reason why we need GTP headers ? IP packets can just travel between eNB and SGW as packet does between two routers without being encapsulated
By mobility we mean IP mobility here
Adnan GTP headers are needed, because of the EPS bearer concept.We need to have a GTP tunnel to be established to have end to end service experience. Therefore GTP headers are used which will provide TEID at each node/ link
Am not sure about Q1. Your page http://4g-lte-world.blogspot.fr/2012/05/default-bearer-dedicated-bearer-what.html and my reading of the 3GPP specs implies that any QCI could be a dedicated bearer (and any one could be a default bearer..). In practice though a normal Internet access APN would have a default bearer with QCI=9 and then this APN may have one or more dedicated bearers set up using Rx on a need basis and this could be for any QCI. for the IMS APN the default bearer is QCI=5 (see GSMA IR.92) and then say QCI=1 9for voice) and or QCI=2 or 7 (for video) and even QCI=9 would be a dedicated bearer (weird configuration but is possible)
Yes thats my understanding too. Any QCI could be dedicated bearer. The correct answer to Q1 is "Dedicated bearer have QCI value between 1 and 5" as this is NOT true about Dedicated bearer. Because Dedicated bearer have QCI between 1 and 9
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Why the answer of number 5 is "SRVCC"?
its an handover during voice call.
SRVCC is also voice solution in LTE. then what is correct answer ??
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