为了评价3G无线网络——UTRAN(UMTS Terrestrial Radio Access Network,陆地无线接入网)网络质量,提出了一个UTRAN网络质量评价指标体系。在该指标体系的基础之上,将模糊数学理论引入网络管理领域,根据模糊综合评价算法建立了UTRAN网络...为了评价3G无线网络——UTRAN(UMTS Terrestrial Radio Access Network,陆地无线接入网)网络质量,提出了一个UTRAN网络质量评价指标体系。在该指标体系的基础之上,将模糊数学理论引入网络管理领域,根据模糊综合评价算法建立了UTRAN网络质量模糊综合评价模型。最后应用此模型,对UTRAN试验网络的测试结果进行了模糊综合评价,得到了UTRAN网络质量的量化评价结果。展开更多
In order to improve the throughput performance of the secondary users （SUs） in the cognitive radio （CR） environment, a quality of service （QoS） based media access control （MAC） protocol is proposed. In this pr...In order to improve the throughput performance of the secondary users （SUs） in the cognitive radio （CR） environment, a quality of service （QoS） based media access control （MAC） protocol is proposed. In this protocol, the CR node maps the channel state as a vector, and the transmitter and the receiver obtain the final channel map through an AND operation to prepare for an optional channel set. Data from the upper application layer are classified into two priority levels according to the QoS requirement. The data of each level relate to different contention windows so that the priority of real time data can be guaranteed. A two-dimensional discrete-time Markov chain is utilized to evaluate the system performance, and mathematical expressions of the system throughput are derived. Simulation results show that compared with the IEEE 802. 11 distributed coordination function （DCF）, the proposed MAC protocol can achieve higher throughput.展开更多
文摘为了评价3G无线网络——UTRAN(UMTS Terrestrial Radio Access Network,陆地无线接入网)网络质量,提出了一个UTRAN网络质量评价指标体系。在该指标体系的基础之上,将模糊数学理论引入网络管理领域,根据模糊综合评价算法建立了UTRAN网络质量模糊综合评价模型。最后应用此模型,对UTRAN试验网络的测试结果进行了模糊综合评价,得到了UTRAN网络质量的量化评价结果。
基金The National Science and Technology Major Project( No. 2010ZX03006-002-01 )the National Basic Research Program of China ( 973 Program) ( No. 2011CB302905)the Science and Technology Support Program of Jiangsu Province ( No. BE2011177)
文摘In order to improve the throughput performance of the secondary users （SUs） in the cognitive radio （CR） environment, a quality of service （QoS） based media access control （MAC） protocol is proposed. In this protocol, the CR node maps the channel state as a vector, and the transmitter and the receiver obtain the final channel map through an AND operation to prepare for an optional channel set. Data from the upper application layer are classified into two priority levels according to the QoS requirement. The data of each level relate to different contention windows so that the priority of real time data can be guaranteed. A two-dimensional discrete-time Markov chain is utilized to evaluate the system performance, and mathematical expressions of the system throughput are derived. Simulation results show that compared with the IEEE 802. 11 distributed coordination function （DCF）, the proposed MAC protocol can achieve higher throughput.
