A study on single-cell point-to-multipoint transmission for public safety communications with eMBMS LTE networks

5G Mixed Mode: An Innovative Point-to-Multipoint Solution for New Radio

“…This mechanism called enhanced-OLLA (eOLLA) biases the received CQI values by an offset (Λ) dependent on the number of UEs (k) as CQI biased = CQI − Λ(k). From the simulations results provided in [14], it was shown that this basic and biased solution provides a similar performance as transmissions with both CQI and HARQ feedback, but simplifying receiver's design and implementation complexities.…”

“…With the aim of reducing the uplink signaling overhead, and based on [14] proposed for Single-Cell Point-to-Multipoint (SC-PTM), a dynamic link adaptation scheme with only CQI feedback is proposed. This mechanism called enhanced-OLLA (eOLLA) biases the received CQI values by an offset (Λ) dependent on the number of UEs (k) as CQI biased = CQI − Λ(k).…”

Hybrid ARQ Scheme with Autonomous Retransmission for Multicasting in Wireless Sensor Networks

“…Recently, there has been a growing need for communication systems that efficiently provide multicast services rather than broadcast services in various applications such as public safety services, surveillance services, smart grid services, and reconnaissance services using unmanned air-vehicles (UAVs) [5,6,7,8,9]. In multicast services, it is important to securely and efficiently share information in a wireless sensor network (WSN) which is composed of various sensors such as cameras, thermal sensors, air pollution sensors, and smart meters.…”

“…Recent results concerning HARQ are presented in [12] and the references therein. The HARQ schemes used in 3GPP LTE and IEEE 802.16m are described in [13,14,15], and the use of HARQ for multicasting has been studied in [5,16,17,18,19]. …”

“…The NACK-based common feedback channel can save feedback overhead in the high signal to interference plus noise ratio (SINR) regime if multiple antennas are used, but the probability of misdetection is quite high in realistic conditions. Moreover, there exists a risk of ACK or NACK misinterpretation in the NACK-based common feedback channel [5,20]. Therefore, only the user specific feedback channel is considered for LTE SC-PtM transmission [10].…”