物理信道接入（PCA）：NS-2中的时频接入方法仿真
Physical Channel Access (PCA): Time and Frequency Access Methods Emulation in NS-2
摘要：
我们提出了一个NS-2模块，物理信道接入（PCA），模拟不同的接入方法共享多频时分多址（MF-TDMA）的链路上。该技术广泛应用于各种网络技术中，例如卫星通信。在这种情况下，不同的接入方法在网关诱导不同的排队延迟和可用容量，这强烈影响传输层的性能。根据QoS要求，新的拥塞和流量控制机制和/或接入方法的设计需要通过仿真进行评估。PCA模块基于低层特性的描述性参数来仿真分组使用共享链路将经历的延迟。虽然PCA已经开发了DVB-RCS 2的考虑（我们提出了一个用例），其他MF-TDMA为基础的appli-阳离子可以很容易地通过调整输入参数模拟。此外，所呈现的实现细节突出了可能需要修改以实现更具体的功能或模拟其他类似访问方法的主要方法（例如，OFDMA）。
英文摘要：
We present an NS-2 module, Physical Channel Access (PCA), to simulate different access methods on a link shared with Multi-Frequency Time Division Multiple Access (MF-TDMA). This tech- nique is widely used in various network technologies, such as satellite communication. In this context, different access methods at the gateway induce different queuing delays and available capacities, which strongly impact transport layer performance. Depending on QoS requirements, design of new congestion and flow control mechanisms and/or access methods requires evaluation through simulations. PCA module emulates the delays that packets will experience using the shared link, based on descriptive parameters of lower layers characteris- tics. Though PCA has been developed with DVB-RCS2 considerations in mind (for which we present a use case), other MF-TDMA-based appli- cations can easily be simulated by adapting input parameters. Moreover, the presented implementation details highlight the main methods that might need modifications to implement more specific functionality or emulate other similar access methods (e.g., OFDMA).
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