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11.
Mehmet Akar 《Wireless Networks》2009,15(6):691-708
In this paper, joint downlink power control and handoff design is formulated as optimization problems that are amenable to
dynamic programming (DP). Based on the DP solutions which are impractical, two new algorithms suitable for next generation
wireless networks are proposed. The first one is an integrated hard handoff/power control scheme that endeavors a tradeoff
between three performance criteria: transmitted power, number of handoffs, and call quality. The second is a soft handoff/power
control algorithm that also takes into account the additional cost of utilizing soft handoff. The proposed algorithms present
a paradigm shift in integrated handoff/power control by capturing the tradeoff between user satisfaction and network overhead,
therefore enjoy the advantages of joint resource allocation, and provide significant improvement over existing methods. The
achievable gains and the tradeoffs in both algorithms are verified through simulations.
相似文献
Mehmet AkarEmail: |
12.
Dimitrios N. Skoutas Saied M. Abd El-atty Angelos N. Rouskas 《International Journal of Wireless Information Networks》2008,15(2):98-104
A key performance indicator of mobile wireless networks is failure probability of handover calls. In this paper, we propose
a Call Admission Control policy which prioritizes handover calls over new calls in WCDMA systems. The OVSF code occupancy
of the system is modeled by a Markov chain and the differentiation between handover and new calls is performed at the code
level by introducing a “guard code” scheme. The scheme belongs to the well-known family of guard channel schemes and reserves
some code capacity to favor the continuation of handover calls over the new calls. As the management of the general case is
intractable, we solve certain numerical instances of the problem and manage to calculate several performance metrics like
new call blocking and handover failure probabilities and code utilization. We complete our study with simulation results in
the case of higher OVSF code tree capacity.
相似文献
Angelos N. RouskasEmail: |
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17.
GSM900/GSM1800双频网技术解决方案初步探讨 总被引:1,自引:0,他引:1
介绍了GSM1800的特点,并从网络设计方面对双频网的组网方式、覆盖方式、话务控制、切换算法等技术解决方案进行了初步探讨。 相似文献
18.
低轨星座卫星通信系统中多业务条件下的非充分保证切换策略 总被引:1,自引:0,他引:1
该文提出了一种适用于低轨星座卫星通信系统多业务条件下的非充分保证切换策略。该策略在小于一个小区最大驻留时间的时间间隔内为到达小区的呼叫安排和预定信道,在呼叫结束环节作为补充策略对存在切换失败风险的信道进行调整。提出了策略在多业务条件下具体的实施方法,根据实时的切换呼叫性能调整策略的非充分程度。通过仿真,分析比较了不同程度非充分保证切换策略的QoS性能,验证了动态自适应调整非充分程度值的IGH策略的有效性。仿真结果表明,相对于保证切换策略,新策略以存在微小切换失败概率为代价,换取了新呼叫阻塞概率的显著降低,是一种适用于多业务低轨卫星通信系统的信道分配策略。 相似文献
19.
Kang Tan Duncan Bremner Julien Le Kernec Lei Zhang Muhammad Imran 《Digital Communications & Networks》2022,8(1):18-24
As vehicle complexity and road congestion increase, combined with the emergence of electric vehicles, the need for intelligent transportation systems to improve on-road safety and transportation efficiency using vehicular networks has become essential. The evolution of high mobility wireless networks will provide improved support for connected vehicles through highly dynamic heterogeneous networks. Particularly, 5G deployment introduces new features and technologies that enable operators to capitalize on emerging infrastructure capabilities. Machine Learning (ML), a powerful methodology for adaptive and predictive system development, has emerged in both vehicular and conventional wireless networks. Adopting data-centric methods enables ML to address highly dynamic vehicular network issues faced by conventional solutions, such as traditional control loop design and optimization techniques. This article provides a short survey of ML applications in vehicular networks from the networking aspect. Research topics covered in this article include network control containing handover management and routing decision making, resource management, and energy efficiency in vehicular networks. The findings of this paper suggest more attention should be paid to network forming/deforming decision making. ML applications in vehicular networks should focus on researching multi-agent cooperated oriented methods and overall complexity reduction while utilizing enabling technologies, such as mobile edge computing for real-world deployment. Research datasets, simulation environment standardization, and method interpretability also require more research attention. 相似文献
20.
中国移动用于室外广覆盖的TD-LTE网络主要有F频段和D频段,两个频段之间的切换主要是基于覆盖的异频切换,切换前用户的RSRP和SINR会比较差,切换后会获得明显提升。前期TD-LTE网络主要承载数据业务,目前VoLTE语音业务发展迅猛,原有基于RSRP的异频切换方式已不适应语音异频切换。为了提升4G客户VoLTE语音业务感知,本文提出了一种基于VoLTE语音质量的异频切换方法。 相似文献