ency domain and/or across spatial channels. Scheduler signalling load is localised to the e node B. Physical layer scheduling can be either max CQI, 6 proportional fair or round robin. Max CQI scheduling allocates LTE resource blocks on the basis of measured channel quality. This is the most efficient scheduler from an operator/network perspective in terms of throughout against available bandwidth and power. However, edge of cell users would suffer very poor service. This would result in inconsistent user experience metrics that could trigger high product return and churn. 6 Channel quality indicators. Interrelationship of the Physical Layer with Other Layers of the OSI Model Round-robin services all users and devices in turn. It delivers the best user experience and hence lowest product return and churn, 7 however, it is theoretically the least efficient option from an operator/network perspective (throughput against bandwidth and power). Proportional fair scheduling is a compromise point between these two extremes and can be set to meet specific user experience expectations. Irrespective of where the scheduling compromise point is set, there is a directly beneficial relationship between user equipment performance and scheduler efficiency gain. Baseband interference cancellation and advanced receiver techniques will be particularly effective in interference-limited conditions; improved RF selectivity will also help. Improved RF sensi- tivity will be particularly helpful in noise-limited conditions. Scheduling is also performed at packet level in order to differentiate best-effort traffic from streamed or interactive or conversational traffic and to respond to resource availability that in turn is a function of physical layer scheduling efficiency. Traditional handover to other channels and/or other bands is also supported providing opportunities to deliver macroscheduling gain. This difference between micro- and macroscheduling gain is often underappreciated - both mechanisms work together to deliver efficiency 