K.C. Serdaroglu | S. Baydere

Conference Object | 2014 | IEEE Wireless Communications and Networking Conference, WCNC , pp.3106 - 3111

With Internet of Things (IoT) vision, computing systems get the ubiquity of real world. Wireless Sensor Network (WSN) technology plays a critical role for the construction of this paradigm. Reliable communication between WSN nodes and outside Internet entities will be needed for remote management of Internet Objects. On the other hand, low bandwith, high delay and packet error rates of the underlying wireless medium can make the realization of such TCP connections highly inefficient. In this study, we investigate the performance of asynchronous TCP connections from multiple WiFi clients to a sensor node on WSN. We model the traffic . . .over WSN gateway as M/M/1 queue and present the results of comprehensive simulation tests for performance of TCP connections in terms of throughput and end-to-end delay. The results reveal that the gateway can achieve reasonable Round Trip Times up to 80 simultaneous connections to WSN when WiFi Packet Error Rate is less than 0.2. © 2014 IEEE Daha fazlası Daha az

Sarisaray Boluk, P. | Irgan, K. | Baydere, S. | Harmanci, A.E.

Conference Object | 2012 | Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering66 LNICST , pp.226 - 241

Multimedia applications in wireless sensor networks (WMSN) have stringent quality of service (QoS) requirements. In this paper, we study image quality distortions due to packet losses in multi hop WMSN. An experimental simulation and real testbed environment has been setup to estimate the quality of the test images over 30,000 transmissions. Two scenarios are considered: in the first scenario, images are watermarked with their replicas at the source node and an error concealment (EC) algorithm is employed at the sink. In the second scenario, raw images are transmitted without any encoding. The empirical results have revealed that th . . .ere is a strong correlation between Peak-Signal-To-Noise- Ratio (PSNR) values of the distorted images and packet loss rate of the transmission route (PER). Moreover, the relationship is linear when EC technique is used with an achievement over 25dB PSNR for PER less than 0.6. This correlation is useful when designing QoS based transport schemes. © 2012 ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering Daha fazlası Daha az

Demir, A.K. | Demiray, H.E. | Baydere, S.

Conference Object | 2011 | IWCMC 2011 - 7th International Wireless Communications and Mobile Computing Conference , pp.565 - 570

Wireless Sensor Networks (WSNs), having inherent features, require new protocols and algorithms for QoS provisioning in realtime multimedia applications. In this paper, we present a new cross-layer communication module, called XLCM and its protocol XLCP enabling scalable service differentiation in WSNs. We implemented XLCP as a module in NS-2 simulator to evaluate its performance. The results indicate that the protocol succesfully differentiates the service classes in terms of latency and reliability requirements. © 2011 IEEE.

Sarisaray Boluk, P. | Irgan, K. | Baydere, S. | Harmanci, E.

Conference Object | 2011 | IWCMC 2011 - 7th International Wireless Communications and Mobile Computing Conference , pp.394 - 399

Wireless Multimedia Sensor Networks (WMSN) have an increasing variety of multimedia based applications including image and video transmission. In these types of applications, multimedia sensor nodes should ideally maximize perceptual quality and minimize energy expenditures in communication. To obtain the required perceptual quality, quality of service (QoS) support is needed at the network level. However, mapping the network parameters to the end-user's perceptual quality measures during building paths is a challenging task due to incomplete identification metrics. In this paper, we propose Image Quality Aware Routing (IQAR) for WM . . .SN that introduces the concept of image quality awareness by considering energy issue. The proposed approach employs intra-image prioritization and an adaptive path selection scheme that adjusts reliability level during image transmission using a distortion prediction model. © 2011 IEEE Daha fazlası Daha az