Development of Adaptive Frame Reservation Scheme and Naive Persistent State Co-Located Coexistence Controller

Future broadband networks need to provide high capacity at low cost with increased revenue through enhanced services. WiMAX came up as one of the leading technologies, however, the 2.3 GHz and 2.5 GHz frequency bands allocated create two serious coexistence issues with the adjacent 2.4 GHz ISM band. First problem is to address radio interfaces that are located on two independent platforms and still possess the potential for mutual interference owing to close proximity to each other. The Adaptive Frame Reservation Scheme presented here extends the CTS frame reservation signaling defined in 802.11 specifications to a demand based and adaptive scheme. Second issue is to address the coexistence problem in multi-radio platforms where two or more radios are co-located, creating an even worse interference scenario. This can be managed by hardware signaling that can be made available between radio interfaces through OS control. The development of a smart Co-located Coexistence Controller is explored which continuously receives transmission, reception and sleep requests from attached interfaces and in return grant permissions.