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In this paper, the authors consider a static cluster of base stations where joint processing is allowed in the downlink. The partial joint processing scheme is a user-centric approach where sub-clusters or active sets of base stations are dynamically defined for each user in the cluster. In frequency selective channels, the definition of the sub-clusters or active set thresholding of base stations can be frequency adaptive (per resource block) or non-adaptive (averaged over all the resource blocks). Frequency adaptive thresholding improves the average sum-rate of the cluster, but at the cost of an increased user data inter-base information exchange with respect to the non-adaptive frequency thresholding case.
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