宽带无线网中的带宽分配方案及QoS分析

A bandwidth allocation scheme and QoS analysis for broadband wireless networks

提出了一种适用于宽带无线网络的带宽分配方案并对业务的QoS指标进行了分析.对于实时的话音和视频业务,系统周期性地每帧为其分配所需信道,同时,每帧中预留一部分保护信道给这类业务的切换呼叫;而非实时的数据业务则使用每帧中剩余的信道.以TDMA/TDD模型为基础对该方案在帧级进行了分析及仿真,结果显示,该方案可同时满足实时业务新呼叫阻塞率、切换呼叫失败率及数据分组时延的要求.

A bandwidth allocation scheme for the broadband wireless network is presented. For the realtime services such as audio and video services, the required channels are allocated in every frame; for the handoff realtime calls, guard channels are reserved in every frame. Nonrealtime services, such as data services, use the remaining channels in each frame. In a multimedia wireless network based on TDMA/TDD, the performance of this scheme is analyzed and evaluated. Results show that the scheme can satisfy constrains on the blocking probability of the realtime new calls, the forced termination probability of realtime handoff calls, and the packet delay of data services.