top button
Flag Notify
    Connect to us
      Facebook Login
      Site Registration Why to Join

Facebook Login
Site Registration

Does an eNodeB use same IP address for all the interfaces ?

+4 votes
548 views

An eNodeB in LTE has many interfaces like M2, X2, S1-C , S1-U . What could be the possible deployment case ? Will all interfaces use same IP address as transport or different IP addresses for each interface ?

posted May 13, 2015 by Harshita

Share this question
Facebook Share Button Twitter Share Button Google+ Share Button LinkedIn Share Button Multiple Social Share Button

2 Answers

+1 vote

As each interface has different transport protocol
S1-C -> SCTP , X2-C - SCTP , S1-U - UDP, X2-U -UDP , M2 interface (Dont have much idea) so we may use same ip or different ip also thats why in messages where enb Share their X2-Tunnel info (transport layer address ) in ENBConfigurationTransfer message over s1 interface to get the X2 Tunnel info of other ENB through MME.

ENb can use same/different ip information for x2,s1,m2 but have to use standard port number for s1-U - 36412 and x2-u 36422.

Lets wait for experts answer ...

answer May 15, 2015 by Sachidananda Sahu
0 votes

These are logical interfaces so technically all interfaces can have same Ethernet or IP Address.

However in practical box design it lot depends on the design constraint and system requirement. Since cabling in eNodeB is critical requirement and pain point so its advisable to minimize the cabling requirement so most likely to have single IP (but not a always case).

answer May 15, 2015 by Salil Agrawal
As they can have different ip used for each interface so while acquiring neighbour eNB x2 tunnel info , source eNB takes help of MME and MME get its x2 tunnel info by asking to neighbor eNB though neighbor eNB general ip info already available at MME during s1-set up.
I hope I got your point correctly, In genral two nodes in the real field are distant a part and connected via mobile backhaul (say routers), so ideally one IP/Ethernet should not create a problem(also enodeB does not have a very high load as the case of SGW/MME). So both configurations are possible multi IP and single IP based on field requirement.
Similar Questions
+2 votes

Why does LTE allocates different IP to UE for each PDN?single IP is enough to handle UE right?can anyont share the scenario why do we need different IP for each PDN?

+3 votes

Which local IP address does FTP select to connect to remote when it has multiple IP addresses ?

+2 votes

While deploying or making lab setup what all things need to be taken into account ? In other words, how interference from neighboring cells can be minimized ? What all configuration values can create high interference between two LTE neighboring cells ?

Contact Us
+91 9880187415
sales@queryhome.net
support@queryhome.net
#280, 3rd floor, 5th Main
6th Sector, HSR Layout
Bangalore-560102
Karnataka INDIA.
QUERY HOME
...