Speech intelligibility of VoIP to PSTN interworking - a key index for the QoS

Abstract

Wireless sensor networks have become incredibly popular due to the Internet of Things' (IoT) rapid development. IoT routing is the basis for the efficient operation of the perception-layer network. As a popular type of machine learning, reinforcement learning techniques have gained significant attention due to their successful application in the field of network communication. In the traditional Routing Protocol for lowpower and Lossy Networks (RPL) protocol, to solve the fairness of control message transmission between IoT terminals, a fair broadcast suppression mechanism, or Drizzle algorithm, is usually used, but the Drizzle algorithm cannot allocate priority. Moreover, the Drizzle algorithm keeps changing its redundant constant k value but never converges to the optimal value of k. To address this problem, this paper uses a combination based on reinforcement learning (RL) and trickle timer. This paper proposes an RL Intelligent Adaptive Trickle-Timer Algorithm (RLATT) for routing optimization of the IoT awareness layer. RLATT has triple-optimized the trickle timer algorithm. To verify the algorithm's effectiveness, the simulation is carried out on Contiki operating system and compared with the standard trickling timer and Drizzle algorithm. Experiments show that the proposed algorithm performs better in terms of packet delivery ratio (PDR), power consumption, network convergence time, and total control cost ratio.

WAVELETS based wireless VOIP and its future scenario

“…Finally WTAR's complexity was relatively high as compared to AR and DIAR [15].The STI (Speech Transmission Index) and SII (Speech Intelligibility Index) are the traditional intelligibility assessment methods and are not intended for VOIP-PSTN channel applications. But after certain adaptations, a hypothetical solution to intelligibility assessment for NB (narrowband) speech transmission channels involving packetized networks was offered [16].A modified PCF (Point Coordination Function) i.e. DPCF (Dynamic Point Coordination Function) scheme was proposed allowing VOIP packets to be transmitted during CP only, when more than one packet is present in an STA's queue [17].The CSR (Compressed Speaker Recognition) builds selective features directly from the already compressed VOIP packet.…”