Wifi-LTE Notes

After Yesterday post on deletion of session and bearer in MME/SGW, later I am bit confused about Release Access Bearer Request, why again one more message to delete a bearer with a different name "release" :-) . So I have done some research to understand it which I am sharing with you below. Hope it will help you all. . Release Access Bearer Request What spec 29.274 says:  The Release Access Bearers Request message shall sent on the S11 interface by the MME to the SGW as part of the S1 release procedure. The message shall also be sent on the S4 interface by the SGSN to the SGW as part of the procedures: - RAB release using S4 - Iu Release using S4 - READY to STANDBY transition within the network List of RABs Shall be present on S4 interface when this message is used to release a subset of all active RABs according to the RAB release procedure. Several IEs with this type and instance values shall be included as n...

Hope you all are doing well...:-)  I am feeling good to write something here after a long time.  Have you ever faced any confusion when dealing with LTE Core Network Protocols? I think it will yes for almost 99% of the people, because confusion is part of our life when we are not very sure or confident about something. Similarly, When I started working on LTE EPC I was very confused about deleting a session and bearer in LTE. Now I got some clarity, which I want to share with you below about three GTPv2 control plane messages which are used in between MME and SGW/PGW very extensively to delete a session or bearer.  1.          Delete Session Request 2.          Delete Bearer Request 3.          Delete Bearer Command It will be a night mare for a newbie to know what these 3 messages are doing to delete a session/ bearer from the network. One type of d...