Recommended upgrade method from ECC5 to ECC6 for lowest production downtime

Hello everybody,
I've been looking through multiple documents concerning a system upgrade and I am still unable to figure out the recommended method for upgrading a system with minimum downtime.
My scenario requires that tests as rigid as possible will be performed and that development will be halted for the shortest time possible , therefore development must be continued after the initial upgrade.
We are currently debating the required way to do this - what should be done with the change requests that currently reside in the DEV system, in which steps the incomptabilities are fixed and so on.
I've decided that I'll share my thoughts with you and maybe you guros will be able to point out mistakes in the methodology.
1. ECC 5 Production System is copied aside, lets call this system EPC
2. Change requests from DEV ECC5 are copied to this EPC System.
3. EPC system is upgraded to ECC6.
4. Bugs and incomptabilities such as unicode incomptabilities are fixed and merged in a change request
This ends the preperation step and in my opinion is sort of a preperation step.
During the whole preparation step, which to my estimate could take at least one month, development in the original system must be continued, so this is my main trouble.
What is the recommended procedure from here?
I assume that another production must be done on the day of the actual upgrade start, then the fixes from the previous preperation system are copied to this actual ECC6 Production, but I am rather lost as far as it goes to having an ECC6 Dev with most current change requests.
I would appreciate any hints and help,
thanks in advance,
Eli.

Ok, your idea of having a production copy for development and tests is a good upgrade strategy, we have done this twice due high quantity of developments and configuragion changes but I don´t see why you wrote " copy change requests from DEV to EPC " your whole configuration, programs, etc, are already in EPC once you copy the system.
In this scenario every change made in DEV ECC 5.0 must be also replicated and tested in EPC 6.0 because you cannot use the change requests from 5.0 in 6.0 once in productive upgrade, let me list the global steps:
1.- Homogeneous system copy from PRD to EPC, you will get a working test platform
2.- Upgrade EPC to 6.0
3.- Developers and functionals will do all respective changes and generate chage requests.
Once EPC is ready
4.- Upgrade DEV system to 6.0 transport change requests created in EPC to upgraded DEV, from this point you should only do emergency changes using Q&A system.
5.- Upgrade Q&A system, transport change requests from DEV, no changes are permited from now until PRD is upgraded.
6.- Do all tests very carefully
7.- Upgrade PRD transport change requests
Then you are ready. the downtime can be tune trough EPC, DEV and Q&A systems so you can determine what you shoud do to assure the shortest method.
I recomend you to use the downtime minimized upgrade method and from every upgrade take a deep look at the upgrade report generated after the whole process is completed.

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Best regards,
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Markus and Volker,
Thank you and points awarded to you both- your prompt and relevant expert responses are very much appreciated!
I thought I'd follow up on the key point Markus made for other forum readers with the same question-
"You have to take into account that once you entered the copy phase (where the shadow system is built) no more transports may run into production (the TMS will be locked). That means that you'd have a full week without the possibility to do changes to the system."
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