Field trial of the 3.5 GHz citizens broadband radio service governed by a spectrum access system (SAS)

Abstract

In this paper, we describe a spectrum access system (SAS) based Citizens Broadband Radio Service (CBRS) field trial using a live LTE network in the 3.5 GHz band. The latest WInnForum specification guided the implementation of the relevant protocols for SAS operation. Here, we evaluate the performance of a CBRS field trial by using one of the most important performance indicators in a spectrum sharing scenario -the evacuation time. It indicates how rapidly the secondary user relinquishes the shared spectrum band to the primary user. Following the applied protocols, we measure and analyze the time scales for the evacuation and frequency change procedures in a field trial environment. Our work shows that the set time limits for the protection of primary users against interference are realistic when using commercially available mobile networks and equipment. Finally, utilizing knowledge of the latest base station models, we propose ways to reduce the evacuation and reconfiguration time by up to 70%.

Literature review of deploying small transmitters on a spectrum sharing scheme

“…Technical works as [86] described the first SAS-CBRS field trial using a live LTE network in the 3.5 GHz band. This work evaluated the performance of a CBRS field trial in a spectrum sharing scenario.…”

“…Overview-Perspectives 2019 [1] shows important figures of market, industry, data traffic, and behavior of users of mobile services. 2018 [79] introduces technical challenges and enabling technologies for 5G 2016 [80] shows spectrum regulation initiatives and open problems in dynamic spectrum sharing 2016 [70] overviews different schemes used for LTE deployments in 3.5 GHz band 2016 [81] analyzes the sources of value creation regarding the CBRS spectrum sharing Markets 2018 [82] presents an economic analysis of the spectrum market in a CBRS scenario 2017 [5] shows new business models for CBRS Regulation & Standards 2018 [31] proposes the standard IEEE P1900.5.2 to share the information among the CBRS elements 2016 [83] studies the effectiveness of census tracts as units of area to license channels 2015 [78] provides technical and deployment parameters of each CBSD and the methodology used to compute exclusion zones 2015 [84] presents in a brief the framework defined by NTIA & FCC for CBRS Experimental deployments 2018 [85] proposes LTE (RP-ABS) mechanism to mitigate interference to pulse radar 2018 [86] evaluates the time for each SAS state in the evacuation and frequency change process 2018 [87] deploys an outdoor scenario based on LBT mechanism for GAA coexistence 2018 [88] evaluates the total network capacity within an existing LTE network and its effect on new technologies as CBRS Spectrum allocation 2018 [19] proposes a channel allocation algorithm and models it mathematically 2018 [89] allocates channels using graphs, and finds solutions by classical heuristic methods 2017 [90] allocates channels through an optimization problem, and solve it using its algorithm 2017 [91] proposes a generic graph representation to model the interference Security 2018 [92] addresses the problem for military users when their transmitters are discovered 2018 [93] develops strategies to keep incumbent users hidden Interference management 2018 [94] addresses the power control and channel allocation problem to predict the throughput 2017 [95] proposes power control algorithms to reduce the protection distances base on co-channel and adjacent interference. 2017 [96] provides expressions for the GAA coverage probability and spectral efficiency 2016 ...…”

Coordinated Spectrum Allocation and Coexistence Management in CBRS-SAS Wireless Networks

“…Hardware experiments, and dedicated field trials evaluating the implementation of the CBRS-SAS model were proposed in [31], [32], as well as in an other paper of the authors of this manuscript, i.e., [33]. Finally, the problem of reliable detection of the incumbent radar systems operating in the 3.5 GHz band is discussed in [34].…”

Designing a Testbed Infrastructure for Experimental Validation and Trialing of 5G Vertical Applications

“…TUAS also co-operated with CORE+ project through WISE2 project and was a full project consortium partner in the follow-up project CORE++ [42]. These projects studied the LSA [43,44,45,46,47,48,49,50,51] and SAS [52,53,54] concepts by developing the framework, participating in the regulatory work and field trialing the developed systems. TUAS participated in the development of repositories for both LSA and SAS and in developing the spectrum sensing system fulfilling the requirements of Environmental Sensing Capability (ESC) in SAS.…”

“…The center frequency is 783 MHz and the span 20 MHz. TUAS has also participated in the development of distributed spectrum sensing system with low cost hardware [102] and Environmental Sensing Capability (ESC) in SAS [54].…”