Point of View to Contention Resolution 
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Introduction
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The advancements in the physical layer technology has enabled cellular networks (e.g., 3G and 4G deployments like Mobile WiMAX, LTE Advanced) and WLANs (e.g., IEEE 802.11n) support hundreds of megabits per second. However, with more and more users now accessing the Internet using wireless as the last mile, there is a continuous necessity to judiciously use the available network resources. Cross-layer strategies have become extremely helpful in supporting the ever increasing demand for bandwidth and stringent QoS. Opportunistic scheduling and multiuser diversity (see [@liu-etal-os]) is one such popular cross-layer technique recommended in current cellular standards and in ad hoc deployments for increasing the available network capacity. Unlike the wired channel, the wireless channel will always be constrained by fading and interference. Multiuser diversity enhances the network performance by wisely scheduling the users when their relative channel conditions are better. Opportunistic scheduling is known to significantly improve the network performance, especially for elastic traffic with loose delay constraints.

Opportunistic scheduling involves learning the channel state information of the contending users and scheduling the user with a relatively better channel. Centralized schemes like polling incur a lot of overhead and may not scale 