Definition of CoTx for a CoBBU NSA 5G Site:
- Background
In the scenario where having and NSA site, this is a 5G site where 4G is used to carry all the signaling (anchoring) and 5G for the user plane .
Each technology is managed by different UMPTs.
Each UMPT should have different Tx. and CoMPT is not available until 19A release
Occupying 2 port in the transmission equipment of the operator may be a problem as normally, Tx equipments due not have many available ports.
Different solutions are available to solve this issue like installing an optical aggregator or installing a datacomm equipment to aggregate both transmission.
There is another low cost alternative and it is the usage of the tunneling functionality to carry of the traffic from one UMPT to the other by using the backplane of the BBU.
Analysis, Strategies and Actions:
Example Data:
Take below data as example:
4G Service IP: A.A.A.A
5G Service IP: B.B.B.B
4G Service GW: C.C.C.C
Core Network subnetwork: D.D.D.D
4G Configuration:
ADD DEVIP: SN=6, SBT=BASE_BOARD, PT=ETH, PN=1, IP=“A.A.A.A”, MASK=“255.255.255.248”, USERLABEL=“traffic”;
ADD IPRT: RTIDX=1, SN=6, SBT=BASE_BOARD, DSTIP=“D.D.D.D”, DSTMASK=“255.255.255.0”, RTTYPE=NEXTHOP, NEXTHOP=“C.C.C.C”, MTUSWITCH=OFF, DESCRI=“to_Core”;
ADD TUNNEL: SSN=6, DSN=7, TUNNELTYPE=DL;
ADD IPRT: RTIDX=11, SN=6, SBT=BACK_BOARD, DSTIP=“B.B.B.B”, DSTMASK=“255.255.255.255”, RTTYPE=IF, IFT=TUNNEL, PREF=1, DESCRI=“4G-5G Backplane Definition”, FORCEEXECUTE=YES;
5G Configuration:
ADD DEVIP: SN=7, SBT=BASE_BOARD, PT=LOOPINT, PN=1, IP=“10.29.124.27”, MASK=“255.255.255.255”, USERLABEL=“traffic”;
ADD TUNNEL: SSN=7, DSN=6, TUNNELTYPE=DL;
ADD IPRT: RTIDX=1, SN=7, SBT=BACK_BOARD, DSTIP=" D.D.D.D", DSTMASK=“255.255.255.255”, RTTYPE=IF, IFT=TUNNEL, DESCRI="5G-4G Backplane Definition ";