卫星光网络标准化数据传输与虚拟信道复用研究

针对激光链路中不同业务数据传输效率低的问题, 提出传输帧再封装单元(TFRU)设计方法。 TFRU采用虚拟信道(CVC)技术,通过对业务数据二次封装与VC复用实现传输数据格 式与速率的统一。 为进一步提升复用效率,提出基于TFRU的VC优先级调度算法,依据TFRU的封装原理 与信源数 据到达率,定义了由VC优先级和帧紧迫度决定的动态帧优先级,并给出VC优先级调 度的具体方 法。仿真表明,采用TFRU后系统吞吐量提高了3.054M,调度时延减少0.918s,较大提升了 系统性能； 只有当TFRU的传输速率大于各信源数据率的总和时,缓存需求才能被满足；基于TFRU的优先 级算法通过对不同信源TFRU帧的动态调度,保证了各VC中TFRU帧的调度公平性。

Research on standardized transmission and virtual channel multiplex in optical satellite network

In optical satellite network,standardized transmission mode is reliabl e guarantee of efficiently processing and transferring multi-sources data in existing space link.Transmis sion frame reframing unit (TFRU) is proposed to solve the problem that different sources data have low transmission efficiency in laser link.TFRU uses virtual channel (VC) technology to unify format and rate of the transmissio n data by second encapsulation and VC scheduling for sources data.The priority VC scheduling algorithm is proposed to further improve multiplex efficiency.According to the principle of TFRU encapsulation and the arrival rate of sources data,the frame dynamic priority is defined by VC priority and frame criticality.And the specific metho d of priority VC scheduling is provided.Simulation results show that the throughput increases by 3.0546M and the scheduling time delay reduces by 0.9183s,so the system performance has been greatly enhanced. Cac he demand is satisfied as the TFRU transmission rate is larger than the sum of all sources data rates.Through d ynamicall y scheduling generation of TFRU frames,the priority algorithm based on TFRU ensures scheduling fairness of the f rames in each VC.