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Cell perturbation for WRF_LES

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I am trying to implement the cell perturbation method in this paper:

The ideal is simple, we add a uniform random to the potential temperature field to each 8x8 gridpoint cell around the boundary, there are 3 cell (24 gridpoint at each boundary).
The problem arise when implement it distribulated memory parallell mode: each CPU can only see the data in each patch allocated to it.
Have any body implemented the method or have ideas to overcome this issue?

Many thanks in advance!
This requires halo to ensure correct communication between patches. How to add halo of specific variables for various schemes is a challenging issue in WRF modification. Please take a look at this presentation and hopefully it can give you some ideas: