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As all-IP based mobile communications networks become a reality, it is important to understand how characteristics of these networks such as delay jitter can affect the overall performance of the system. We find that backbone network delay jitter can significantly influence the multiple access performance of an all-IP mobile communications system. To compensate for this, we introduce an adaptive jitter compensation technique that is linked to the system slot allocation and multiple access mechanisms. By linking these mechanisms, we are able to compensate for delay jitter, whilst also introducing novel resource allocation techniques for use with multimedia traffic. We detail the various techniques introduced, and show the performance enhancements possible when using such a scheme.