感知或不感知

摘要：

较长的感测时间提高了感测性能;然而，在固定帧大小的情况下，较长的感测时间将减少次级用户（SU）的允许数据传输时间。在本文中，我们试图解决在通过随机访问主信道而进行的时隙的$τ$秒内感测主信道与随机访问主信道而不感测之间的折衷，以避免在感测中浪费$τ$秒。SU感测主信道以利用静默时段，如果主用户（PU）被宣布为空闲，则SU以某个接入概率$a_s$随机接入信道。除了在PU被感测为空闲的情况下随机地接入信道之外，如果信道被声明为繁忙，则它可能以某个接入概率$b_s$来接入该信道。这是因为虚警和误检测的可能性导致显著的次级吞吐量下降并影响PU QoS。我们提出了可变的感知持续时间计划，SU优化的最佳感知时间，以实现最大的稳定吞吐量的主要和次要的队列。结果揭示了所提出的方案相对于传统感测方案的性能增益，即，SU感测主信道达$τ$秒，并且如果PU被声明为空闲，则以概率1接入。此外，所提出的方案克服了随机接入无感测方案。理论和数值结果表明，可能存在对误检测和虚警概率，使得在非常小的持续时间内感测主信道克服了在大部分时隙内感测主信道。此外，对于到主队列的特定平均到达率，可能存在误检测和虚警概率对，使得无感测的随机接入克服了具有长感测持续时间的随机接入。

英文摘要：

A longer sensing time improves the sensing performance; however, with a fixed frame size, the longer sensing time will reduce the allowable data transmission time of the secondary user (SU). In this paper, we try to address the tradeoff between sensing the primary channel for $τ$ seconds of the time slot proceeded by randomly accessing it and randomly accessing primary channel without sensing to avoid wasting $τ$ seconds in sensing. The SU senses primary channel to exploit the periods of silence, if the primary user (PU) is declared to be idle the SU randomly accesses the channel with some access probability $a_s$. In addition to randomly accesses the channel if the PU is sensed to be idle, it possibly accesses it if the channel is declared to be busy with some access probability $b_s$. This is because the probability of false alarm and misdetection cause significant secondary throughput degradation and affect the PU QoS. We propose variable sensing duration schemes where the SU optimizes over the optimal sensing time to achieve the maximum stable throughput for both primary and secondary queues. The results reveal the performance gains of the proposed schemes over the conventional sensing scheme, i.e., the SU senses the primary channel for $τ$ seconds and accesses with probability 1 if the PU is declared to be idle. Also, the proposed schemes overcome random access without sensing scheme. The theoretical and numerical results show that pairs of misdetection and false alarm probabilities may exist such that sensing the primary channel for very small duration overcomes sensing it for large portion of the time slot. In addition, for certain average arrival rate to the primary queue pairs of misdetection and false alarm probabilities may exist such that the random access without sensing overcomes the random access with long sensing duration.

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