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Liaison statement
LS on 3GPP Interface transport protocol port number assignment

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State Posted
Submitted Date 2018-07-26
From Contact Georg Mayer
To Group IETF
To Contacts The IETF Chair <>
Cc The IESG <>
The IETF Chair <>
Response Contact
Purpose For information
Attachments (None)
1. Overall Description:

TSG RAN would like to thank IANA and IETF for the assignment of numbers for
3GPP specific protocols and applications.

During the last 20 years, 3GPP was granted about 13 port allocations for
transport port protocols used over 3GPP interfaces which today are widely
deployed and used for many different scenarios. Examples for those are RNSAP,
S1, Xn, F1, …

Recently, IANA rejected the request for a new transport protocol port number
designated for the E1 interface. The E1 interface is part of the NR logical
architecture for 5G.  3GPP understands that IANA is rethinking its policy for
assigning SCTP port numbers. However, 3GPP is currently finalising the new 5G
radio access, including network and interface aspects, for which imminent
deployments are foreseen. The continued cooperation of IANA to support and
facilitate 5G adoption by following past practices, will be highly appreciated.

2. Actions:
ACTION:         TSG RAN would like IETF and IANA to take the above information
into consideration and ensure timely progress of 3GPP work to support and
facilitate 5G deployments.

3. Date of Next TSG-RAN Meetings:
TSG-RAN Meeting #81     10th – 13th September 2018      Gold Coast, Australia
TSG-RAN Meeting #82     10th – 13th December 2018       Sorrento, Italy