Abstract
This paper presents an efficient reconfigurable access scheme for massive machine-type communication networks, where to provide massive connectivity, the base station is equipped with a large-scale antenna array. In particular, to maximize the expected throughput of the network, the scheme uses a frame divided into two segments: grant-based and grant-free that are more efficient for devices with high and low expected throughput, respectively. At the beginning of each frame, the base station decides how to partition the two segments, the resource allocation in the grant-based segment and the access probabilities in the grant-free segment to maximize the expected throughput based on the device traffic profiles. The corresponding optimization problem is formulated, and a sub-optimal solution algorithm with low computational complexity is proposed. The performance of the proposed access scheme is evaluated under different conditions to demonstrate its advantages in terms of achieved throughput and average packet delay.
Highlights
NUMERICAL RESULTS In order to evaluate the performance of the proposed access scheme, simulations on Matlab environment are conducted and its optimization toolbox is used to solve problem (23)
This paper considers a network of massive machine-type devices, where to provide massive connectivity, a massive multiple-input multiple-output (MIMO) base station (BS) is deployed
Aiming to maximize the expected throughput of the network consisting of devices with diverse packet arrival probabilities, a reconfigurable and traffic-aware access scheme is proposed
Summary
A. BACKGROUND AND MOTIVATION Massive machine-type communication (mMTC) has been identified as one of the three key applications of 5G networks. The goal of mMTC services is to provide connection to large numbers of devices that transmit data between themselves or to a base station (BS) with little human intervention. Devices in mMTC may transmit their packets in a frequent or sporadic manner [1], and their data packets are usually short. This necessitates an access scheme that can support heterogeneous traffic at low signaling overhead. While wireless resources are limited, mMTC networks have to support large numbers of devices, which makes the massive access a problem in mMTC [2]. Thanks to the large number of base station (BS) antennas in massive MIMO, the channel vectors
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