基于排队理论的信道分配算法研究

Study on Channel Allocation Scheme Based on Queuing Theory

针对蜂窝移动通信系统,基于排队理论提出了一种信道分配方案。该方案将信道分为2部分:语音信道和数据保护信道。预留数据保护信道用于补偿数据丢包率,同时对语音业务设置FIFO排队缓冲器,切换呼叫优先占用缓冲器以确保切换优先。当语音信道空闲时,数据业务可以占用语音信道,一旦有语音呼叫请求到来且无可用语音信道,数据业务应释放占用的语音信道,在数据缓存器中排队等待。仿真结果表明该方案不仅降低了新增呼叫阻塞率和切换掉话率,而且提升了数据业务的性能。

A Channel-Allocation scheme based on Queuing Theory is proposed for cellular mobile communications systems. The model includes two parts： voice channels and data guard channels. Guard channels are provided for data traffic to compensate data-packet loss probability. FIFO buffer is provided for voice calls, and handoff calls are given priority to be queued in the front of the buffer. Data traffic can occupy voice channels when they are free, the channels are occupied by data-packet should be released if voice channels are not available. Results show that the scheme not only decrease new call blocking probability and handoff call dropping probability, but also enhance data traffic performance.