Vehicular Ad hoc Networks (VANETs) which is a special form of Mobile Ad hoc Networks (MANETs) has promising application prospects in the future. Due to the rapid changing of topology structure, how to find a route whi...Vehicular Ad hoc Networks (VANETs) which is a special form of Mobile Ad hoc Networks (MANETs) has promising application prospects in the future. Due to the rapid changing of topology structure, how to find a route which can guarantee Quality of Service (QoS) is an important issue in VANETs. This paper presents an improved Greedy Perimeter Stateless Routing (GPSR) protocol based on our proposed next-hop node selection mechanism. Firstly, we define the link reliability in two cases which take the movement direction angle between two vehicles into consideration. Then we propose a next-hop node selection mechanism based on a weighted function which consists of link reliability between the sender node and next-hop candidate node, distance between next-hop candidate node and the destination, movement direction angle of next-hop candidate node. At last, an improved GPSR protocol is proposed based on the next-hop node selection mechanism. Simulation results are presented to evaluate the performance of the improved GPSR protocol, which shows that the performance including packet delivery ratio and average end-to-end delay of the proposed protocol is better in some situations.展开更多
Mobile multihop communication network is an important branch of modern mobile communication system, and is an important technical support for ubiquitous communication. The random movement of the nodes makes the networ...Mobile multihop communication network is an important branch of modern mobile communication system, and is an important technical support for ubiquitous communication. The random movement of the nodes makes the networking be more flexible, but the frequently changing topology will decrease the link duration between nodes significantly, which will increase the packets loss probability and affect the network communication performance. Aiming at the problem of declining link duration caused by nomadic characteristics in mobile multihop communication network, four link duration models for possible moving states are established based on different features in real networking process in this paper, which will provide reliable criterion for the optimal routing selection. Model analysis and simulation results show that the reliable route established by the proposed model will effectively extend the link duration, and can enhance the global stability of the mobile multihop information transmission, so as to provide new option to transmission reliability improvement for the mobile communication network.展开更多
针对不同应用场景的用户利用底层网络资源不充分的问题,提出一种利用网络切片技术对切片进行准入控制和资源分配联合算法(Joint Access Control and Resource Allocation Algorithm for Slicing,JACRAAS)。在第五代移动通信技术(5th Gen...针对不同应用场景的用户利用底层网络资源不充分的问题,提出一种利用网络切片技术对切片进行准入控制和资源分配联合算法(Joint Access Control and Resource Allocation Algorithm for Slicing,JACRAAS)。在第五代移动通信技术(5th Generation Mobile Communication Technology,5G)的演进(5G-Advanced,5G-A)标准下,通过最大化网络切片提供商(Network Slicing Provider,NSP)的收益,使用双深度Q网络算法对网络切片请求进行智能高效的准入控制和资源分配,并对重要经验优先回放,拒绝不满足条件的切片请求。同时,考虑网络拓扑对节点的影响,对重要节点优先排序,并进行节点映射和链路映射。仿真结果表明,所提算法与深度Q网络算法和Q学习算法相比,NSP收益成本比分别提高了9%和15%,资源利用率分别提升了10%和14%,所提算法可以显著提高底层资源的利用率。展开更多
文摘Vehicular Ad hoc Networks (VANETs) which is a special form of Mobile Ad hoc Networks (MANETs) has promising application prospects in the future. Due to the rapid changing of topology structure, how to find a route which can guarantee Quality of Service (QoS) is an important issue in VANETs. This paper presents an improved Greedy Perimeter Stateless Routing (GPSR) protocol based on our proposed next-hop node selection mechanism. Firstly, we define the link reliability in two cases which take the movement direction angle between two vehicles into consideration. Then we propose a next-hop node selection mechanism based on a weighted function which consists of link reliability between the sender node and next-hop candidate node, distance between next-hop candidate node and the destination, movement direction angle of next-hop candidate node. At last, an improved GPSR protocol is proposed based on the next-hop node selection mechanism. Simulation results are presented to evaluate the performance of the improved GPSR protocol, which shows that the performance including packet delivery ratio and average end-to-end delay of the proposed protocol is better in some situations.
基金support by the National Natural Science Foundation of China under Grant No.61302074, 61571181Natural Science Foundation of Heilongjiang Province under Grant No.QC2013C061+2 种基金Modern Sensor Technology Research and Innovation Team Foundation of Heilongjiang Province No. 2012TD007Postdoctoral Research Foundation of Heilongjiang Province No. LBH-Q15121Postgraduate Innovation Research Foundation of Heilongjiang University under Grant No. YJSCX2016-019HLJU
文摘Mobile multihop communication network is an important branch of modern mobile communication system, and is an important technical support for ubiquitous communication. The random movement of the nodes makes the networking be more flexible, but the frequently changing topology will decrease the link duration between nodes significantly, which will increase the packets loss probability and affect the network communication performance. Aiming at the problem of declining link duration caused by nomadic characteristics in mobile multihop communication network, four link duration models for possible moving states are established based on different features in real networking process in this paper, which will provide reliable criterion for the optimal routing selection. Model analysis and simulation results show that the reliable route established by the proposed model will effectively extend the link duration, and can enhance the global stability of the mobile multihop information transmission, so as to provide new option to transmission reliability improvement for the mobile communication network.
文摘针对不同应用场景的用户利用底层网络资源不充分的问题,提出一种利用网络切片技术对切片进行准入控制和资源分配联合算法(Joint Access Control and Resource Allocation Algorithm for Slicing,JACRAAS)。在第五代移动通信技术(5th Generation Mobile Communication Technology,5G)的演进(5G-Advanced,5G-A)标准下,通过最大化网络切片提供商(Network Slicing Provider,NSP)的收益,使用双深度Q网络算法对网络切片请求进行智能高效的准入控制和资源分配,并对重要经验优先回放,拒绝不满足条件的切片请求。同时,考虑网络拓扑对节点的影响,对重要节点优先排序,并进行节点映射和链路映射。仿真结果表明,所提算法与深度Q网络算法和Q学习算法相比,NSP收益成本比分别提高了9%和15%,资源利用率分别提升了10%和14%,所提算法可以显著提高底层资源的利用率。
