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首页> 外文期刊>Journal of systems and software >An efficient approach for distributed dynamic channel allocation with queues for real-time and non-real-time traffic in cellular networks
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An efficient approach for distributed dynamic channel allocation with queues for real-time and non-real-time traffic in cellular networks

机译：蜂窝网络中具有实时和非实时流量队列的分布式动态信道分配的有效方法

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摘要

We are witnessing these days a rapid growth of mobile users. Therefore, frequency spectrum must be efficiently utilized, as available frequency spectrum is limited. This paper proposes a channel allocation scheme with efficient bandwidth reservation, which initially reserves some channels for handoff calls, and later reserves the channels dynamically, based on the user mobility. The direction of user mobility may not be straight always, but the user may also go left, right or backwards. Thus, QoS can be improved, if the channel reservation is made based upon the user mobility and the location of the user. We devise here a new algorithm that deals with multiple traffic systems by modifying the existing DDCA algorithm [Krishna, P.V., Iyengar, N.Ch.S.N., 2008. Optimal channel allocation algorithm with efficient channel reservation for cellular networks. International Journal of Communication Networks and Distributed Systems 1 (1), 33-51]. This algorithm reserves more channels for hot cells, less number of channels for cold cells and an average number of channels for the medium cells. Furthermore, we maintain queues for all types of calls. We model the system by a three-dimensional Markov Chain and compute the QoS parameters in terms of the blocking probability of originating calls and the dropping probability of handoff calls. The results indicate that the proposed channel allocation scheme exhibits better performance by considering the above mentioned user mobility, type of cells, and maintaining of the queues for various traffic sources. In addition, it can be observed that our approach reduces the dropping probability by using reservation factor.
机译：这些天，我们见证了移动用户的快速增长。因此，由于可用频谱有限，因此必须有效利用频谱。本文提出了一种具有高效带宽预留的信道分配方案，该方案首先根据用户移动性为切换呼叫保留一些信道，然后再动态保留信道。用户移动的方向可能并不总是笔直的，但是用户也可以向左，向右或向后走。因此，如果基于用户移动性和用户位置进行信道预留，则可以改善QoS。我们在这里设计一种新的算法，通过修改现有的DDCA算法来处理多个流量系统[Krishna，P.V.，Iyengar，N.Ch.S.N.，2008。具有有效信道预留功能的蜂窝网络最佳信道分配算法。国际通信网络与分布式系统杂志1（1），33-51]。该算法为热室保留更多的通道，为冷室保留较少的通道数量，为中层细胞保留平均数量的通道。此外，我们为所有类型的呼叫维护队列。我们通过三维马尔可夫链对系统进行建模，并根据始发呼叫的阻塞概率和切换呼叫的掉线概率来计算QoS参数。结果表明，通过考虑上述用户移动性，小区类型以及维护各种流量源的队列，提出的信道分配方案表现出更好的性能。另外，可以看出，我们的方法通过使用保留因子来降低掉线概率。

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