Recently, IEEE drew up a new task group named TGax to draft out the standard 802.11ax for next generation WLANs. However, average throughput is very low due current medium access control (MAC) protocol. A promising solution this problem draw Orthogonal Frequency Division Multiple Access (OFDMA) into enable multiuser access. The key challenges of adopting OFDMA are synchronization and overhead reduction. In paper, we propose an based (OMAX) protocol solve both two above. whole channel...

The physical (PHY) layer peak rate of the wireless local area network (WLAN) has been almost exponentially improved over past 15 years since 1999. However, it is proved that throughput very low comparing to PHY rate, and media access control (MAC) efficiency in current WLANs specification, especially dense deployment scenarios. Therefore, achieve high MAC IEEE Standards Association Board (IEEE-SA) approves 802.11ax March 2014, draw up a brand new amendment for next generation WLAN. One...

Proliferating networking demands require the wireless local area networks (WLANs) to keep evolving. In May 2019, IEEE 802 standards committee formally established working group of next generation WLAN: 802.11be. To satisfy ultra-high definition video traffic and achieve objective extremely high throughput (EHT), multi-band operation (MB-Opr) is considered as one important technology. However, after deep analysis, simply adapting MB-Opr not enough for requirements This paper analyzes possible...

As the most widely used standards for wireless local area network (WLAN), IEEE 802.11 are continuously amended by introducing new techniques so as to meet increasing demands. In order verify performance of protocols, simulation is considered a significant method. However, far we know, current tools only either media access control layer (MAC) or physical (PHY). The separate MAC and PHY can hardly evaluate 802.11ax in whole system level authenticity objectivity. Hence, next generation WLAN...

In a 1-D linear vehicular ad hoc network (1-DL-VANET), some vehicles may leave the (e.g., at highway exits), which make 1-DL-VANET disconnected. Thus, it is important to analyze connectivity of 1-DL-VANET. When removal any ( <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">k</i> - 1) arbitrary nodes from does not disconnect network, said be -connected. this paper, we investigate -connectivity Sufficient and necessary conditions are derived for...

Wireless sensor networks (WSNs) are widely used for various applications. In some applications, it is very likely that the number of sensors limited, initial deployment random, and “holes” (i.e., subareas where there no sensor) may exist. Therefore, a major challenge in WSNs to improve network coverage. A viable solution enhance with mobility capability so they can move inside after deployment, which referred as mobile redeployment. this paper, we target at generic framework optimal...

The next generation Internet of Things (IoT) is expected to support extremely diverse applications and terminals, which requires the massive connectivity. Unfortunately, current mobile communication systems with orthogonal multiple access technique can hardly satisfy this demand. On other hand, narrow band property has become trend IoT, however, problem interference alleviation in system difficult be resolved. Recently, sparse code (SCMA), a non- for 5G, shows obvious improvement user...

Massive MIMO is one of the most promising technologies for fifth generation (5G) mobile communication systems. In order to better assess system performance, it essential build a corresponding channel model accurately. this paper, three-dimension (3D) two-cylinder regular-shaped ge

In this paper, we consider roadside infrastructure-to-roadside infrastructure communications in a vehicular ad hoc network. A remote unit (RSU), which does not have connection to the backbone network, needs send its data traffic central RSU (which has connection) by using help from vehicles passing by. Cost is assigned information transmission energy consumption, as well possible violation of soft delay bound. For each vehicle, decide whether or ask for with target at minimal rate cost. We...

With the rapid development of Internet Things (IoT), radio frequency identification (RFID) system becomes increasingly important. Tag is a basic problem RFID system, whose purpose to inventory tags. However, in recent years, it requires very short time for massive tag identification, which brings serious challenges. The traditional Aloha based anti-collision algorithms have disadvantages either low efficiency or high complexity. Therefore, this article proposes complexity dynamic frame...

IEEE 802.11 wireless local area network (WLAN) has been increasingly developed over several decades. It requires four times throughput improvement in the next generation WLAN. Thus, researchers focus on co-frequency co-time full duplex technology, which makes devices transmit and receive pac

The ever-increasing data demands and the density of wireless nodes require higher rate in networks. To satisfy requirement, it is necessary to propose novel medium access control (MAC) protocols enhance multiuser channel transmission network. existing studies prove that full-duplex (FD) able improve network capability without any extra bandwidth. However, there are few focusing on FD MAC protocol design for next generation In this paper, a named as MU-FuPlex introduced based our proposed...

In a vehicular delay tolerant network, the problem of scheduling traffic from roadside unit to passing-by vehicles is studied. A cost function associated with scheduled transmission. And if bound violated, penalty charged. The optimal stopping theory applied decide when should schedule its accumulated vehicle such that rate minimized. It shown strategy pure-threshold strategy, i.e., upon arrival, queueing at above threshold, it transmission via vehicle. Simulation results validate...

This paper investigates the problem of traffic scheduling between roadside units (RSUs) in a vehicular delay-tolerant network. A source RSU needs help passing-by vehicles to forward its destination RSU. Costs are associated with energy consumption and information loss. When vehicle arrives, decide whether stop, i.e., transmit vehicle, or skip this continue wait for other vehicles. The RSU's objective is achieve minimal rate cost. In paper, we theoretically derive an optimal stopping strategy...

The emerging 5G cellular networks will operate at millimeter wave (mmWave) frequency bands to enhance the cell capacity. Massive MIMO antenna array and beamforming technology are used in order overcome propagation limitations of mmWave band. Multi-beam based communication system is considered as basic structure for mobile network. However, optimize capacity, question how many beams required remains unclear. In this paper, considering with massive technologies, we accurately model inter-beam...

The Wireless Local Area Network (WLAN) has become a dominant piece of technology to carry wireless traffic for Internet Things (IoT). next-generation high-density WLAN scenario is very suitable the development trend industrial sensor network. However, in deployed scenarios, access efficiency low due severe collisions, and interference diffused scattered locations parallel stations (STAs), which results area throughput, i.e., spatial reuse gain. A group-based multi-user full-duplex orthogonal...