Wi-Fi Coordinated WiGig Concurrent Transmissions in Random Access Scenarios

Relay Probing for Millimeter Wave Multi-Hop D2D Networks

“…Taking advantage of the standardized multi-band mmWave nodes, the integration between µW/mmWave bands was extensively investigated to address the challenges of mmWave communications and optimize its performance. In [1], the µW RSS radio map was used as an index to the mmWave best beams radio map for enabling mmWave concurrent transmissions in random access scenarios. In [2], a multi-band heterogenous architecture was introduced for 5G networks based on the integration between LTE/Wi-Fi/mmWave bands empowered by a new concept of 2C/U plane splitting.…”

“…The large swath of available spectrum in the millimeter (mmWave) band, 30 ∼ 300 GHz, attracts researchers from both academia and industry to use it for fifth generation (5G) and beyond (B5G) applications [1]- [5]. WiGig standards, e.g., IEEE 802.11ad and IEEE 802.11ay, defined the set of protocols required to attain the communications in the The associate editor coordinating the review of this manuscript and approving it for publication was Cunhua Pan .…”

Delay Analysis and Optimization of Beam Scanning-Based User Discovery in Millimeter Wave Systems

“…In this processing, the UE first detects the neighboring BSs in the cell search phase and then acquires the connection with the network by initiating the random access phase. The reliance on directional transmission of mmWave complicates the initial access of the system [6]- [9]. In traditional cellular systems such as long term evolution (LTE), BSs generally use fixed beams for omnidirectional coverage [5] to implement the UE discovery while BF and directional transmission are usually used after user associated with base stations (BSs) to achieve high beam gain.…”

“…To solve this problem, in the process of UE discovery, BSs need to use BF technology to obtain narrow beams and scan the whole beam space directionally to expand the coverage of mmWave system. Beam scanning, which uses continuous switching beams to cover different directions, has been widely used in IEEE802.11ad and other protocols [6]. Because of the potential beam search space, this search method reduces the initial access speed of UE, resulting in serious search delay.…”

“…In order to reduce the training cost, [12] proposed a hierarchical search process, in which BSs first use wide beams for sector-level exhaustive search and then use narrow beams for beam-level optimization search. Reference [6] proposed a greedy scheme of the UE access, which utilizes the statistical features of WiGig access point (AP) to estimate the suboptimal candidate AP along with the suboptimal beam direction for reducing the training cost and maximizing the total system throughput. Reference [13] investigated the feasibility of random BF and analyzed the performance in terms of failure probability and expected latency for UE discovery.…”