水声网络中的MAC协议主要采用RTS/CTS机制,然而RTS/CTS控制包不仅限制了并发传输的可能性,进而降低了信道利用率和吞吐量,而且造成信道资源分配不公平。为了提高吞吐量、信道利用率和公平性,提出了一种基于状态着色的水声网络MAC(State ...水声网络中的MAC协议主要采用RTS/CTS机制,然而RTS/CTS控制包不仅限制了并发传输的可能性,进而降低了信道利用率和吞吐量,而且造成信道资源分配不公平。为了提高吞吐量、信道利用率和公平性,提出了一种基于状态着色的水声网络MAC(State Coloring based MAC,SC-MAC)协议。在SC-MAC协议中,每个节点根据自身一跳邻居表构建本地分层图,通过侦听数据帧或ACK帧获知邻居节点状态来为本地分层图中的节点着色,并根据本地分层着色图调度包的发送,减少数据帧的碰撞与重传。SC-MAC协议在避免冲突的前提下实现了并行传输。同时,给出基于公平性的退避方案以提高SC-MAC协议的公平性。仿真结果表明,SC-MAC协议与R-MAC协议和slotted-FAMA协议相比在端到端延迟、吞吐量和平均能耗等方面有明显的优势。展开更多
As the traffic distribution in China mainland is far from uniform, a new traffic model in China mainland is presented on the basis of per-capita Gross Domestic Product (GDP) and density of population. Based on this ch...As the traffic distribution in China mainland is far from uniform, a new traffic model in China mainland is presented on the basis of per-capita Gross Domestic Product (GDP) and density of population. Based on this characteristic traffic model, a new Traffic Dependent Dynamic Channel Allocation and Reservation (TDDCAR) technique is proposed, the simulation model is built, and the strategies' performance is evaluated through computer simulation. The simulation results show that, compared to the conventional Fixed Channel Allocation (FCA), TDDCAR estimates the traffic conditions in every spot beam and frequently adjusts the traffic according to current traffic conditions. It has achieved a significant improvement in new call blocking probability, handover blocking probability, and fair index, particularly, in heavy traffic conditions. The building of traffic model in China mainland and the analysis of the simulation results has been a key foundation for the study of resource allocation schemes in the future.展开更多
文摘水声网络中的MAC协议主要采用RTS/CTS机制,然而RTS/CTS控制包不仅限制了并发传输的可能性,进而降低了信道利用率和吞吐量,而且造成信道资源分配不公平。为了提高吞吐量、信道利用率和公平性,提出了一种基于状态着色的水声网络MAC(State Coloring based MAC,SC-MAC)协议。在SC-MAC协议中,每个节点根据自身一跳邻居表构建本地分层图,通过侦听数据帧或ACK帧获知邻居节点状态来为本地分层图中的节点着色,并根据本地分层着色图调度包的发送,减少数据帧的碰撞与重传。SC-MAC协议在避免冲突的前提下实现了并行传输。同时,给出基于公平性的退避方案以提高SC-MAC协议的公平性。仿真结果表明,SC-MAC协议与R-MAC协议和slotted-FAMA协议相比在端到端延迟、吞吐量和平均能耗等方面有明显的优势。
文摘As the traffic distribution in China mainland is far from uniform, a new traffic model in China mainland is presented on the basis of per-capita Gross Domestic Product (GDP) and density of population. Based on this characteristic traffic model, a new Traffic Dependent Dynamic Channel Allocation and Reservation (TDDCAR) technique is proposed, the simulation model is built, and the strategies' performance is evaluated through computer simulation. The simulation results show that, compared to the conventional Fixed Channel Allocation (FCA), TDDCAR estimates the traffic conditions in every spot beam and frequently adjusts the traffic according to current traffic conditions. It has achieved a significant improvement in new call blocking probability, handover blocking probability, and fair index, particularly, in heavy traffic conditions. The building of traffic model in China mainland and the analysis of the simulation results has been a key foundation for the study of resource allocation schemes in the future.
