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In this research, core technologies supporting 3Gbps WLAN will be studied in order to accommodate uncompressed HDTV video and very high throughput applications. For very high throughput, we will develop a contention based directional MAC protocol using circular RTS/CTS in 60GHz bands in order to fully utilize merit of the spatial reuse and to tackle the problems of deafness and hidden node. Examples of applications supporting more than Gbps data rate. Standardization organizations such as IEEE802.11ad and IEEE802.15.3c recommend 60GHz spectrum for very high throughput communication. Although IEEE802.15.3c exploiting reservation based directional antenna is currently being standardized, there are still lots of technical challenges to be improved, e.g., contention based directional MAC is not incorporated in the standard. In this work, we will develop a contention based directional MAC protocol using circular RTS/CTS in order to tackle the problems of deafness and hidden node. The proposed protocol will maximize the spatial reuse and thus improve overall throughput even under node mobility and infrastructureless deployment. Example of the deafness problem. In order to achieve very high throughput communication, the following core functions need to be developed for contention based directional MAC: (1) Minimizing Circular RTS/CTS Overhead: CRTS/CCTS mechanism has a significant number of transmissions for RTS/CTS. In this work, we will minimize the unnecessary overhead. (2) Efficient DNAV(Directional NAV) Computation: We will synchronize the DNAV time among neighboring nodes to avoid deafness problem. (3) RTS/CTS Retransmission Scheme to resolve Deafness Problem: Nodes suffering from deafness will keep sending RTS to designated receiver resulting in unnecessary power consumption. We will rectify this problem using DNAV value for each beam. (4) Intelligent Communication Range Control for Spatial Reuse: Using distance computation from sender to receiver, we will minimize hidden node and deafness problems. (5) Reliable Multicasting: By using reliable and energy-efficient multicasting algorithm, we will minimize the number of ACKs and ACK transmission time. (6) Directional MAC Simulator based on NS-2: we will evaluate the performance of the proposed directional MAC using NS-2 simulator and optimize any performance parameters.

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