4G network consists of the followings Network Elements ..a.MSCb.HLRc.VLRd.SAE GW

The 4G network, also known as LTE (Long Term Evolution), consists of the following network elements:

a. MME (Mobility Management Entity): This replaces the MSC (Mobile Switching Center) in 3G. It is responsible for tracking and authenticating users.

b. HSS (Home Subscriber Server): This replaces the HLR (Home Location Register) in 3G. It is a central database that contains user-related and subscription-related information.

c. S-GW (Serving Gateway): This replaces the VLR (Visitor Location Register) in 3G. It routes data packets between the base stations and the PDN Gateway.

d. SAE GW (System Architecture Evolution Gateway): This is a core network hub in the Evolved Packet Core of LTE networks. It includes the MME, Serving Gateway and PDN Gateway.

Please note that the 4G network architecture is quite different from the 3G network, and the elements mentioned in the question are more related to 3G networks.