Apoorva Jindal, Konstantinos Psounis,
... that random access scheduling schemes, and more specifically CSMA-CA, yield exceptionally good performance in the context of wireless multihop networks. While it is believed that CSMA-CA performs significantly worse than optimal, this belief is ... we first compare the achievable rate region of CSMA-CA and optimal in a number of carefully constructed multihop topologies and find that CSMA-CA is always within 48% of the optimal. Motivated ... we next characterize the worst-case performance of CSMA-CA in neighborhood topologies representing the congested regions of ...
Tópico(s): Wireless Networks and Protocols
2012 - Institute of Electrical and Electronics Engineers | IEEE/ACM Transactions on Networking
... We consider carrier-sense multiple-access/collision-avoidance (CSMA/CA) protocols as the wireless MAC protocols, since CSMA/CA protocols are based on the standard for wireless ... throughput and packet delay for three types of CSMA/CA protocols: basic CSMA/CA, stop-and-wait automatic repeat request (SW ARQ) CSMA/CA, and four-way handshake (4-WH) CSMA/CA. We calculate the capture probability of an access ... protocols. We have found that the performance of CSMA/CA in a radio channel model is 50% less ... load, while the throughput and packet delay of CSMA/CA in a radio channel model show better performance ...
Tópico(s): Advanced Wireless Network Optimization
1999 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Vehicular Technology
... use carrier sense multiple access with collision avoidance (CSMA/CA) protocol. However, the network performance of CSMA/CA is largely degraded in UAV-relay network systems ( ... In this paper, URNS architecture and time-mirroring CSMA/CA (TM-CSMA/CA) are proposed to satisfy these requirements. First, a ... by only using the physical layer. Second, TM-CSMA/CA guarantees that the UAV relay always wins contention ... defer time without a MAC layer. Thus, TM-CSMA/CA provides better network performance than CSMA/CA. To ...
Tópico(s): UAV Applications and Optimization
2019 - Institute of Electrical and Electronics Engineers | IEEE Systems Journal
Jianjun Lei, Dewang Tan, Xiaohan Ma, Ying Wang,
Carrier Sense Multiple Access with Collision Avoid (CSMA/CA) restricts the channel utilization efficiency although it always is regarded as a promising distributed channel access scheme, especially in dynamic dense wireless network ... hop networks. Specifically, we propose a light-weight CSMA/CA mechanism based on Q-Learning (QL), namely QL-CSMA/CA, which jointly optimizes multiple channel access parameters, including ... performance. Due to the limitation of the QL-CSMA/CA in large-scale state-space scenarios, we further ...
Tópico(s): Advanced Wireless Communication Technologies
2023 - Elsevier BV | Ad Hoc Networks
Liqiang Zhao, Jie Zhang, Hailin Zhang,
... effectively in WMNs, the authors present a hybrid CSMA/CA protocol by integrating a proposed virtual CSMA/CA and the standard CSMA/CA protocol. When a node has no packet to send, it contends for the channel in virtual CSMA/CA mode. In this way the node can estimate ... send, it contends for the channel in standard CSMA/CA mode with the optimal strategy obtained in virtual CSMA/CA mode, switching smoothly from virtual to standard CSMA/CA mode. At the same time, the node keeps ... propose a simplified game-theoretic MAC protocol (G-CSMA/CA) by designing an auto degressive backoff mechanism based ...
Tópico(s): Cooperative Communication and Network Coding
2008 - Institute of Electrical and Electronics Engineers | IEEE Network
Yu Cheng, Hongkun Li, Peng‐Jun Wan, Xinbing Wang,
... practical carrier sense multiple access with collision avoidance (CSMA/CA) medium access control (MAC) protocol. We resort to ... into account the collision overhead in the distributed CSMA/CA MAC. Such overhead due to random access has ... aggressive capacity planning, which is unachievable over the CSMA/CA MAC. This paper makes the following three main ... we develop a generic method of integrating the CSMA/CA MAC analysis with the MCF formulation for optimal ... throughput; 2) we define a new concept of CSMA/CA clique and theoretically study its relationship to a ...
Tópico(s): Cooperative Communication and Network Coding
2012 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Vehicular Technology
Hojoong Kwon, Hanbyul Seo, Seonwook Kim, Byeong Gi Lee,
... channel carrier sense multiple access with collision avoidance (CSMA/CA) protocol for orthogonal frequency division multiple access (OFDMA) systems. The CSMA/CA system in conventional single-channel operation has the ... each time instant. The OFDMA-based multi-channel CSMA/CA protocol is designed to enable the stations to ... a generalized form of the conventional single-channel CSMA/CA protocol: It allows to segment the channel bandwidth ... CSMA protocol that can emulate the multi-channel CSMA/CA protocol and then analyze its saturated throughput. The ...
Tópico(s): Bluetooth and Wireless Communication Technologies
2009 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Wireless Communications
Farhan Masud, Abdul Hanan Abdullah, Gaddafi Abdul-Salaam,
... slotted-Carrier Sense Multiple Access/Collision Avoidance (TCP-CSMA/CA) scheme. The emergency traffic is handled through Emergency Traffic Class Provisioning-based slotted-CSMA/CA (ETCP-CSMA/CA) scheme. The emergency-based traffic adaptivity is provided through Emergency-based Traffic Adaptive slotted-CSMA/CA (ETA-CSMA/CA) scheme. The TCP-CSMA/CA scheme assigns a distinct, minimized and prioritized backoff ... access in Contention Access Period (CAP). The ETCP-CSMA/CA scheme delivers the sporadic emergency traffic that occurs ...
Tópico(s): Bluetooth and Wireless Communication Technologies
2019 - Public Library of Science | PLoS ONE
Xin Wang, Georgios B. Giannakis,
Carrier sense multiple access with collision avoidance (CSMA/CA) has been adopted by the IEEE 802.11 standards for wireless local area networks (WLANs). Using a distributed coordination function (DCF), the CSMA/CA protocol reduces collisions and improves the overall throughput. To mitigate fairness issues arising with CSMA/CA, we develop a modified version that we term ... by employing a binary exponential backoff similar to CSMA/CA. Different from CSMA/CA, CSMA/CCA copies the contention window (CW) size ...
Tópico(s): Cooperative Communication and Network Coding
2006 - Springer Nature | EURASIP Journal on Wireless Communications and Networking
Fasee Ullah, Abdul Hanan Abdullah, Gaddafi Abdul-Salaam, Marina Md Arshad, Farhan Masud,
... Beacon-enabled Carrier-Sense Multiple Access/Collision-Avoidance (CSMA/CA) scheduling access scheme in WBAN, allocates Contention-free ... data.Also, a Contention Differentiated Adaptive Slot Allocation CSMA-CA (CDASA-CSMA/CA) for scheduling access scheme is proposed to reduce ... resolve the patient's data drops in the CSMA/CA scheme due to exceeding of threshold values in ... over the IEEE 802.15.4 MAC and CSMA/CA scheme in terms of success rate, packet delivery ...
Tópico(s): Bluetooth and Wireless Communication Technologies
2017 - Korea Society of Internet Information | KSII Transactions on Internet and Information Systems
M. P. R. S. Kiran, P. Rajalakshmi,
... compared to carrier sense multiple access-collision avoidance (CSMA/CA). In this paper, we first propose a novel Markov-chain-based analytical model for unslotted CSMA/CA and PCA for industrial applications. The unslotted model ... extended to derive the analytical model for slotted CSMA/CA and PCA. Primary emphasis is laid on understanding the performance of PCA compared to CSMA/CA for different traffic classes in industrial applications. The ... delay and power consumption respectively compared to slotted CSMA/CA, whereas unslotted PCA achieves a delay reduction of ...
Tópico(s): Wireless Body Area Networks
2018 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Industrial Informatics
Mahmoud Gamal, Nayera Sadek, Mohamed R. M. Rizk, Magdy A. Ahmed,
... employs carrier sense multiple access with collision avoidance (CSMA/CA) protocol to access the network using either unslotted ... slotted mode. This paper concentrates on the unslotted CSMA/CA where the node tends to wait for a ... average delay are high. To enhance the unslotted CSMA/CA performance, this paper proposes a modified unslotted CSMA/CA that divides the backoff delay into Main Backoff ... Secondary Backoff. The Markov model for the modified CSMA/CA is presented to assess a single hop IEEE ... energy consumption and reliability constraints for the modified CSMA/CA. OPNET simulation tool is applied to compare the ...
Tópico(s): Mobile Ad Hoc Networks
2020 - Elsevier BV | Alexandria Engineering Journal
Jo Woon Chong, Youngchul Sung, Dan Keun Sung,
... into multiband carrier sense multiple access/collision avoidance (CSMA/CA) networks is proposed to provide strict quality of ... users are provided with best-effort service using CSMA/CA modified for multiband operation. The performance of the ... MAC scheme is investigated using a new multiband CSMA/CA Markov chain model capturing the primary user activity ... function of the primary user activity and other CSMA/CA parameters. It is shown that the new MAC ... yields larger throughput than the conventional single-band CSMA/CA when both schemes use the same bandwidth.
Tópico(s): Cognitive Radio Networks and Spectrum Sensing
2009 - Institute of Electrical and Electronics Engineers | Journal of Communications and Networks
Chang Woo Pyo, Hiroshi Harada,
... is based on the hybrid multiple access of CSMA/CA and TDMA. In order to study the throughput ... affected by the length of access time of CSMA/CA. A large length of access time of CSMA/CA will cause a low data transmission time in ... while a short length of access time of CSMA/CA will cause a large number of data transmission collisions in CSMA/CA. The failure of data transmission channel release due ... release and provide the optimum access time of CSMA/CA, thereby maximizing the throughput. The proposed method can ...
Tópico(s): Bluetooth and Wireless Communication Technologies
2009 - Institute of Electrical and Electronics Engineers | IEEE Journal on Selected Areas in Communications
... the carrier sense multiple access with collision avoidance (CSMA/CA) protocol. To simplify the analysis, a new backoff ... analysis is used for modelling the proposed CC-CSMA/CA protocol. The resulting model describes the regular CSMA/CA protocol as a special case. Protocol performance measures ... and channel utilisation. It is found that CC-CSMA/CA offers improvements over a system that uses CSMA/CA.
Tópico(s): Distributed systems and fault tolerance
2006 - Institution of Engineering and Technology | IEE Proceedings - Communications
Feng Xia, Jie Li, Ruonan Hao, Xiangjie Kong, Ruixia Gao,
... 4 slotted Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) employs static parameter configuration without supporting differentiated services ... proposes a priority‐based Service Differentiated and Adaptive CSMA/CA (SDA‐CSMA/CA) algorithm to provide differentiated QoS for various Smart ... conditions. Simulation results demonstrate that the proposed SDA‐CSMA/CA scheme significantly outperforms the IEEE 802.15.4 slotted CSMA/CA in terms of effective data rate, packet loss ...
Tópico(s): IoT Networks and Protocols
2013 - Hindawi Publishing Corporation | The Scientific World JOURNAL
Negar Kiyavash, Farinaz Koushanfar, Todd P. Coleman, Mavis Rodrigues,
... used carrier sense multiple access with collision avoidance (CSMA/CA) protocol. The spyware components are embedded within the ... spied data. Our codes are robust against the CSMA/CA's random retransmission time for collision avoidance and ... tested on a widely used open-source wireless CSMA/CA radio platform. We identify the following performance metrics ... 2) robustness of the communication scheme to heterogeneous CSMA/CA effects; and 3) difficulty of covert channel detection. ... Criterion 2) is evaluated by simulating a wireless CSMA/CA architecture and testing the robustness of the decoder ...
Tópico(s): Internet Traffic Analysis and Secure E-voting
2013 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Information Forensics and Security
Osama Bazan, Muhammad Jaseemuddin,
... the directional carrier sense multiple access/collision avoidance (CSMA/CA) protocols encounter unprecedented challenges that can offset this ... analytically studied since existing analytical models for directional CSMA/CA ignore the effect of deafness. In this study, the authors develop an analytical framework for directional CSMA/CA, which is the first analytical model to consider ... between spatial reuse and deafness when a directional CSMA/CA protocol is employed. Their results demonstrate that decreasing ...
Tópico(s): Mobile Ad Hoc Networks
2010 - Institution of Engineering and Technology | IET Communications
Sumit Kumar Singh, Prashanth Aravinda Kumar Acharya, Upamanyu Madhow, Elizabeth M. Belding‐Royer,
... insensitive traffic, assuming a narrowband physical layer with CSMA/CA capabilities. The VoIP call carrying capacity of wireless mesh networks based on classical CSMA/CA (e.g., the IEEE 802.11 standard) is ... to implement. In this paper, we introduce Sticky CSMA/CA, a new medium access mechanism that provides TDM- ... gains. Nodes monitor the medium using the standard CSMA/CA mechanism, except that they remember the recent history ...
Tópico(s): Cooperative Communication and Network Coding
2007 - Elsevier BV | Ad Hoc Networks
Feiran Wang, Yuping Zhao, D. Li,
... specifications, employing carrier sense multiple access/collision avoidance (CSMA/CA) strategies, represents a significant milestone in promoting deployment ... authors first analyse the performance of the slotted CSMA/CA strategy specified in the contention access period (CAP) ... used to analyse the performance of the unslotted CSMA/CA strategy specified in IEEE 802.15.4 as well as that of the slotted CSMA/CA strategy. Extensive simulations demonstrate the accuracy and effectiveness ...
Tópico(s): Energy Efficient Wireless Sensor Networks
2011 - Institution of Engineering and Technology | IET Communications
Qin Liu, Yanan Chang, Xiaohua Jia,
... in contention-based wireless sensor networks that use CSMA/CA MAC layer protocols as defined in IEEE 802. ... all sensor nodes within the delay bound. In CSMA/CA protocols, the success probability and the expected transmission ... We propose a hybrid method that combines the CSMA/CA protocol with TDMA scheduling of transmissions. We divide ... Within the group, the nodes still use the CSMA/CA protocol to compete for data transmission. By doing ...
Tópico(s): Wireless Networks and Protocols
2012 - Elsevier BV | Computer Communications
Bharat Shrestha, Ekram Hossain, Kae Won Choi,
... of carrier-sense multiple access with collision avoidance (CSMA/CA) can be combined with that of time-division ... area networks. In particular, the performance of legacy CSMA/CA-based medium access control scheme in congested networks can be enhanced through a hybrid CSMA/CA-TDMA scheme while preserving the scalability property. In ... distributed channel access scheme outperforms the legacy slotted CSMA/CA scheme. The centralized model outperforms the distributed model ...
Tópico(s): Energy Efficient Wireless Sensor Networks
2014 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Wireless Communications
Kyou Jung Son, Sung‐Kwon Hong, Seong-Pil Moon, Tae‐Gyu Chang, Hanjin Cho,
... improving carrier sense multiple access with collision avoidance (CSMA/CA). Improving CSMA/CA is important because the low-power consumption feature ... IEEE 802.15.4 are greatly affected by CSMA/CA behavior. To improve the performance of CSMA/CA, this paper focused on increasing the chance to ... method used in CCA, which is employed by CSMA/CA, assesses the channel by measuring the energy level ...
Tópico(s): Mobile Ad Hoc Networks
2016 - Multidisciplinary Digital Publishing Institute | Sensors
Pervez Khan, Niamat Ullah, Farman Ali, Sana Ullah, Youn-Sik Hong, Lee Ki-Young, Hoon Kim,
The Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) procedure of IEEE 802.15.6 Medium Access ... packet collisions. Therefore, The IEEE 802.15.6 CSMA/CA has developed the ABEB procedure to avoid the ... chain to design the PFB scheme for the CSMA/CA procedure of the IEEE 80.15.6 standard. ... is compared against the ABEB function of WBAN CSMA/CA. The results show that the PFB procedure adopted for IEEE 802.15.6 CSMA/CA outperforms the ABEB procedure.
Tópico(s): Bluetooth and Wireless Communication Technologies
2017 - Multidisciplinary Digital Publishing Institute | Sensors
Nurullah Shahin, Rashid Ali, Young‐Tak Kim,
... on carrier-sense multiple access with collision avoidance (CSMA/CA), was analyzed as not efficient enough for registration ... In this paper, we propose a hybrid slotted-CSMA/CA-time-division multiple access (TDMA) (HSCT) medium access ... AP. In the proposed HSCT, contention-based slotted-CSMA/CA allows devices to send an authentication request via ... scheme, and the conventional IEEE 802.11ah with CSMA/CA.
Tópico(s): Wireless Networks and Protocols
2018 - Institute of Electrical and Electronics Engineers | IEEE Access
Bin Cao, Mengyang Li, Lei Zhang, Yixin Li, Mugen Peng,
... MAC mechanism, carrier sense multiple access/collision avoidance (CSMA/CA), is suitable for wireless blockchain networks or not. ... impact of queueing and transmission delay caused by CSMA/CA. Next, a stochastic model is proposed to analyze ... the performance would be limited by the traditional CSMA/CA protocol. Meanwhile, we demonstrate that the probability of ... successful double-spending attack would be affected by CSMA/CA as well.
Tópico(s): IoT and Edge/Fog Computing
2019 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Industrial Informatics
Farhan Masud, Abdul Hanan Abdullah, Ayman Altameem, Gaddafi Abdul-Salaam, Farkhana Muchtar,
... based Carrier Sense Multiple Access/Collision Avoidance (TCP-CSMA/CA) scheme for prioritized channel access to heterogenous-natured ... class in every backoff during contention. In TCP-CSMA/CA, the BMSNs are distributed among four traffic classes ... out to determine the performance of the TCP-CSMA/CA in terms of packet delivery delay, throughput, PDR, ... consumption. The results prove that the proposed TCP-CSMA/CA scheme performs better than the IEEE 802.15. ...
Tópico(s): Molecular Communication and Nanonetworks
2019 - Multidisciplinary Digital Publishing Institute | Sensors
Yohan Kwon, Hoki Baek, Jaesung Lim,
... of carrier sense multiple access with collision avoidance (CSMA/CA) by increasing packet collisions with the number of ... are no previous studies on uplink NOMA in CSMA/CA networks. In the considered system, owing to the ... medium access control procedure for uplink NOMA with CSMA/CA is also presented. The analytic results demonstrate that ... saturation throughput and average packet delay than conventional CSMA/CA.
Tópico(s): Satellite Communication Systems
2020 - Institute of Electrical and Electronics Engineers | IEEE Systems Journal
Liu Bo, Shiying Han, Huyang Peng, Zihao Xiang, Guiling Sun, Ying‐Chang Liang,
... to the access point (AP) according to the CSMA/CA protocol while receiving the information from their respective ... only decreases the PHY-layer SINR of the CSMA/CA system, but also increases its failure probability of ... affected by the MAC-layer activity of the CSMA/CA system. To this end, we analyze the cross- ... layer outage capacities of the BD and the CSMA/CA systems. Simulation results are provided to verify our ... the interaction between the BD and the ambient CSMA/CA systems.
Tópico(s): Advanced Wireless Communication Technologies
2020 - Institute of Electrical and Electronics Engineers | IEEE Wireless Communications Letters
Achour Achroufene, Mourad Chelik, Nassima Bouadem,
... the Carrier-Sens Multiple Access with Collision Avoidance (CSMA/CA) protocol. In this article, a modified CSMA/CA is proposed to meet the requirements of the ... the found results. Compared to the use of CSMA/CA as implemented in Contiki, using the proposed modified CSMA/CA in both data fusion applications improves QoS.
Tópico(s): Water Quality Monitoring Technologies
2021 - Elsevier BV | Computer Networks