scholarly journals Rateless Coded Uplink Transmission Design for Multi-User C-RAN

Sensors ◽  
2019 ◽  
Vol 19 (13) ◽  
pp. 2978 ◽  
Author(s):  
Zhang ◽  
Xu ◽  
Peng ◽  
Lu ◽  
Zhang
Keyword(s):  
Information Transfer ◽  
Belief Propagation ◽  
Access Network ◽  
Base Station ◽  
System Throughput ◽  
Node Degree ◽  
Transmission Scheme ◽  
Radio Access ◽  
System Overhead ◽  
Raptor Code

Cloud radio access network (C-RAN) is a promising technology for the Internet of Things (IoT). In C-RAN, the remote radio head (RRH) and baseband unit (BBU) in the conventional base station are separated, and each BBU is backward centralized into a virtual BBU pool. In this paper, we consider the uplink transmission for the two-user C-RAN with two RRHs under a block fading channel. A novel rateless coded transmission scheme is designed. During each transmission round, each user keeps transmitting to the RRHs using Raptor code until the BBU pool feeds back an acknowledgement (ACK). With the proposed scheme, each user does not require the instant channel state information, which greatly reduces the system overhead. We also design the quantizer at the RRHs and the iterative multi-user detector and decoder at the BBU pool, based on the belief propagation (BP) algorithm. For the Raptor code applied at each user, we optimize the corresponding output node degree profile, based on extrinsic information transfer (EXIT) analysis for the decoding process at the BBU pool. The resulted degree profiles are optimal in an average sense under all possible channel states. The simulation results show that the rateless coded transmission scheme with the optimized degree profiles outperforms the benchmark degree profile in both bit error rate and average system throughput. Moreover, the achieved performance is close to the theoretical limit.

scholarly journals Evaluation of Interference in Ultra-Dense 5G Radio Access Networks with Beamforming

Telecom IT ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 35-59
Author(s):  
G. Fokin
Keyword(s):  
Radiation Pattern ◽  
Antenna Arrays ◽  
Access Network ◽  
Beam Width ◽  
Base Station ◽  
Access Networks ◽  
Base Stations ◽  
Radio Access Network ◽  
Radio Access Networks ◽  
Radio Access

In this paper, we investigate the dependence of the level of intersystem interference on the beam width of the adaptively formed antenna radiation pattern and the territorial separation of neighboring devices in ultra-dense 5G radio access networks. The results of simulation modeling of a radio access network based on 19 base stations with the parameterization of the antenna array gain by the width of the radiation pattern in the horizontal plane show that when the base station beam is di-rected to the user device and narrowed from 360° to 5°, the level of intrasystem interference decreases by 15 dB compared with the case of omnidirectional antennas. The results of simulation of a radio access network based on 19 three-sector base stations with planar antenna arrays of 64 elements illustrate a significant reduction in the level of interference in comparison with the case of omnidirectional antennas and, in order to obtain zones of a positive signal-to-noise ratio, confirm the need for a territorial separation of neighboring devices by 10–20 % of the range of radio coverage.

Delay-Sensitive Network Selection and Offloading in LTE-A and Wi-Fi Heterogeneous Networks

2020 ◽  
pp. 2150120
Author(s):  
Chun-Chuan Yang ◽  
Jeng-Yueng Chen ◽  
Yi-Ting Mai ◽  
Yi-Chih Wang
Keyword(s):  
Traffic Congestion ◽  
Access Network ◽  
Access Point ◽  
Base Station ◽  
Network Selection ◽  
Core Network ◽  
Delay Sensitive ◽  
Radio Access ◽  
Lte Advanced ◽  
Average System

LTE-Advanced (LTE-A) offloading is concerned about alleviating traffic congestion for the LTE-A network, which includes the core network and the radio access network (RAN). Due to the scarcity of the radio resource, offloading for the LTE-A RAN is more critical, for which an efficient way is to integrate Wi-Fi with LTE-A to form a heterogeneous RAN environment. An LTE-A UE (User Equipment) with the wi-fi interface can therefore access the Internet via an LTE-A base station of Evolved Node B (eNB) or a wi-fi Access Point (AP). In this paper, wireless network selection for UEs with delay-sensitive traffic in the heterogeneous RAN of LTE-A and wi-fi is addressed. Based on the queueing model of M/G/1, a novel network selection and offloading scheme, namely Delay-Sensitive Network Selection and Offloading (DSO), is proposed. The average system time at LTE-A eNBs and wi-fi APs calculated according to M/G/1 is used for network selection as well as offloading operations in DSO. The benefit of DSO in terms of satisfying the delay budget of UEs and load balancing is demonstrated by the simulation study.

scholarly journals THE DYNAMICS OF THE INTERFERENCE SITUATION IN THE DOWNLINK DIRECTION OF THE MOBILE COMMUNICATION NETWORK WITH CDMA TECHNOLOGY

2019 ◽  
Vol 26 ◽  
pp. 61-68
Author(s):  
E.A. SUKACHEV ◽  
Keyword(s):  
Power Level ◽  
Access Network ◽  
Mobile Station ◽  
Base Station ◽  
Control Mode ◽  
Signal Interference ◽  
Transmitter Power ◽  
Radio Access ◽  
Inter Cell Interference

The work is devoted to the investigation of inter-cell interference in the radio access network, provided that subscribers are moving in cells along the route indicated earlier. Very often, the trajectory of the movement of mobile stations coincides with the grid of city streets, where subscribers are moving in public transport. For a network where the cluster dimension is K = 1, the proposed methodology for studying changes in the level of intra-system interference at the input of the receiver of a mobile station when a subscriber is moving along the given path. The features of the situation where the control mode of the transmitter power of the base station is used in each cell, which provides a constant power level of the input signal when the subscriber is moving within the cell, are analyzed. The level of inter-cell interference is estimated as one of the factors on which the quality of services depends, namely, the signal-to-interference ratio at the input of the receiver of the mobile station. For specific trajectories of the movement of subscribers in neighboring cells, a law of changing the transmitter power of the base station was found, which interferes with the receiver of the mobile station in the neighboring cell. Estimated ratios are obtained for determining the level of interference when subscribers in neighboring cells are moving along parallel streets. This assessment of the dependence of the signal / interference ratio at the input of the subscriber's receiver on the speed and direction of its movement. This dependence shows that serious problems with the quality of service provided by the operator will not arise. Such an investigation allows modeling the cellular network in order to optimize the work on improving the services provided to mobile subscribers.

Lower latency in LPWAN NETWORKS

2018 ◽  
pp. 154-159
Author(s):  
Krum Videnov ◽  
Georgi Hristov
Keyword(s):  
Low Power ◽  
Access Network ◽  
Base Station ◽  
Area Network ◽  
Wide Area Network ◽  
Delay Sensitive ◽  
Radio Access ◽  
Multi Access ◽  
Real Time Information ◽  
Time Information

The report compares LPWAN (low-power, wide-area network) and MEC (Multi-access edge computing) topologies, examines opportunities to achieve lower latency in LPWAN networks by integrating their architecture with the MEC paradigm. LPWAN networks are highly suitable to be combined with a MEC architecture. The radio-access equipment place,e.g., base station, gateway, etc., is a main location to run delay-sensitive applications, processing/storage offloading tasks, or hosting those services that need in real-time information from the RAN (Radio Access Network). For that reason, this places in the network has been identified as ideal for installing the MEC equipment.The four-tier architecture of LPWAN and MEC are kept, so they perfectly match with each other.

scholarly journals Enhancing Radio Access Network Performance over LTE-A for Machine-to-Machine Communications under Massive Access

2016 ◽  
Vol 2016 ◽  
pp. 1-16
Author(s):  
Fatemah Alsewaidi ◽  
Angela Doufexi ◽  
Dritan Kaleshi
Keyword(s):  
Network Performance ◽  
Success Probability ◽  
Access Network ◽  
Random Access ◽  
Base Station ◽  
Radio Access Network ◽  
Machine To Machine ◽  
Radio Access ◽  
Access Channel ◽  
Control Traffic

The expected tremendous growth of machine-to-machine (M2M) devices will require solutions to improve random access channel (RACH) performance. Recent studies have shown that radio access network (RAN) performance is degraded under the high density of devices. In this paper, we propose three methods to enhance RAN performance for M2M communications over the LTE-A standard. The first method employs a different value for the physical RACH configuration index to increase random access opportunities. The second method addresses a heterogeneous network by using a number of picocells to increase resources and offload control traffic from the macro base station. The third method involves aggregation points and addresses their effect on RAN performance. Based on evaluation results, our methods improved RACH performance in terms of the access success probability and average access delay.

scholarly journals A Novel Coordinated Edge Caching with Request Filtration in Radio Access Network

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Yang Li ◽  
Yuemei Xu ◽  
Tao Lin ◽  
Xiaohui Wang ◽  
Song Ci
Keyword(s):  
Access Network ◽  
Mobile Network ◽  
Network Capacity ◽  
Base Station ◽  
Radio Access Network ◽  
Limited Bandwidth ◽  
Content Caching ◽  
Radio Access ◽  
Caching Scheme ◽  
Average Latency

Content caching at the base station of the Radio Access Network (RAN) is a way to reduce backhaul transmission and improve the quality of experience. So it is crucial to manage such massive microcaches to store the contents in a coordinated manner, in order to increase the overall mobile network capacity to support more number of requests. We achieve this goal in this paper with a novel caching scheme, which reduces the repeating traffic by request filtration and asynchronous multicast in a RAN. Request filtration can make the best use of the limited bandwidth and in turn ensure the good performance of the coordinated caching. Moreover, the storage at the mobile devices is also considered to be used to further reduce the backhaul traffic and improve the users’ experience. In addition, we drive the optimal cache division in this paper with the aim of reducing the average latency user perceived. The simulation results show that the proposed scheme outperforms existing algorithms.

scholarly journals On the Statistical Distribution of Packets Service Time in Cellular Access Networks

2019 ◽  
Vol 9 (6) ◽  
pp. 4996-5000
Author(s):  
A. Y. Al-Zahrani
Keyword(s):  
Service Time ◽  
Access Network ◽  
Base Station ◽  
Radio Waves ◽  
Core Network ◽  
Actual Distribution ◽  
Radio Access Network ◽  
Radio Access ◽  
A Cell ◽  
Multiple Cells

A cellular communication system is divided into two main parts, core network, and radio access network. This research is concerned with the radio access network part which consists of multiple-cells, each served by a central located base station. Furthermore, the users in each cell are considered to be uniformly distributed inside the cell. In the downlink context, the users’ packets usually arrive at the base station via fiber optic and then are relayed to the users via radio waves of certain frequency/ies. The speeds of delivering users’ packets vary, depending on the users’ location. In this paper, the actual distribution of the service time over different users whose locations are uniformly distributed in a cell served by one base station is analytically found. Simulation results are presented to validate the derived model.

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