From: s v[mailto:SV@gmail.com]
Sent: Wednesday, November 23, 2011 4:44 PM
To: Bhardwaj, Rajiv
Subject: 1 qstn

On what interface in LTE, Control Plane SCTP over IP and UDP over IP is used and Why?

On Wed, Nov 23, 2011 at 11:22 AM, Bhardwaj, Rajiv  <rajiv.bhardwaj@xxx.com> wrote:

Because control plane needs more reliability so it uses S1AP over SCTP.

User plane can use less reliable i.e UDP

It was same in 3G

RANAP over SCTP for control

&

GTP over UDP for User

From: s v[mailto:SV@gmail.com]
Sent: Thursday, November 24, 2011 5:02 PM
To: Bhardwaj, Rajiv

Subject: Re: 1 qstn

thn why S10 is over UDP? like all other contro plane interfaces like S11, S5/S8, S3/S4 all are UDP not SCTP..

On Thu, Nov 24, 2011 at 11:37 AM, Bhardwaj, Rajiv  <rajiv.bhardwaj@xxx.com> wrote:

All these interfaces have control information but they are just used to create the GTP tunnels.

So there is no “special” control information but just the bearer establishment. So it can be called control plane but it is only control information for creating tunnel for user data. So its more or less part of the user data.

While RANAP has real control information like LUP, attach, ciphering etc.. This information is critical & is needed even if there is no user data. But remaining interfaces only work when there is some user data.

On Thu, Nov 24, 2011 at 11:46 AM, s v <SV@gmail.com> wrote:

hmm banda ghaint hai tu… thanks