Hi Cecilia,
I worked on a quite similar situation a few years ago for a Tier One operator in France. The context was :
- Build of a new BSS system, in replacement of a legacy mainframe. Both cohabitated several years until all customer were migrated.
- Replacement of legacy OSS inventory, which was closely coupled to the legacy BSS.
Here is the strategy whe had recommanded and applied :
1) Base principles :
- No impact on legacy BSS/OSS stack
- Progressive switch between the old inventories and the new ones
2) Implentation of a routing mechanism on the new BSS, for each kind of resource
- Routing on resource allocation, based on the kind of offer, to handle a progressive switch to the new inventory
- Routing on resource modification, based on the location of the primary allocated resource
3) Implementation of a three step migration between old and new inventories
- Step 1 : the old inventory remains the master. The new inventory automatically pulls its resources modification to the old one through either real time flows where available, either night batch flows.
- Step 2 : the new inventory becomes the master, when most of the resources are managed through it. All flows from the new BSS have been routed to the new inventory. We accepted a batch synchronisation flow from the new inventory to the old one, since the volume of modification on the old one had become quite small.
- Step 3 : after the complete migration of customers to the new BSS system, the old inventories can be decommissioned.
In addition, a partitioning of resources has been set up between the old and new inventories, where possible, to avoid inconsistency (for example : MSISDN range, SIM cards stocks).
Please let me know if you need further details.
Regards,
Matthieu Lemoine
Sopra Steria
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Matthieu LEMOINE
Senior Enterprise Architect
Sopra Steria - Telecom, Media & Entertainment
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Original Message:
Sent: 06-16-2017 00:18
From: Cecilia Galindo
Subject: Inventories and BSS Migration Strategy
In a TELCO, we have to migrate several inventories (more than 8 OSS sources) to 2 OSS destinations (internal and external plant inventories). They support the fulfilment and assurance processes of the company (fixed services).
At the same time we have to migrate the BSS, and we'll have a coliving period (old BSS uses the old inventories systems, new BSS uses the new inventories). The BSS migration strategy must be supported by the inventory migration strategy.
In your experience, i would like to know:
- difficulties to migrate the inventories
- strategies to migrate inventories and manage coliving
- any recommendation considering the scenery.
If you can share your experiences, I will be grateful.
Thanks
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Cecilia
Telefonica
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