Source-linked AI summary
Revisiting Wireless Internet Connectivity: 5G vs Wi-Fi 6
Edward J Oughton, William Lehr, Konstantinos Katsaros, Ioannis Selinis, Dean Bubley, Julius Kusuma
TL;DR
The paper addresses limited consideration of Wi-Fi 6 alongside heavily discussed 5G for high-speed wireless Internet connectivity. It compares the technologies and concludes that they can serve as alternatives, substitutes, and complements across different contexts.
Problem
The research community has not adequately considered Wi-Fi 6 alongside 5G in assessing next-generation wireless connectivity technologies.
Method
The paper revisits wireless Internet connectivity by comparing and contrasting 5G and Wi-Fi 6 technical features and competitive dynamics.
Results
5G and Wi-Fi 6 are viewed as alternative and substitute options in many contexts, while also serving as complements in many others.
Takeaways & Limitations
The paper concludes that both technologies will generally remain important for wireless connectivity, with 5G still preferred in general.
Takeaways & Limitations
The current user base makes the innovative cellular concept more of a niche service.
Abstract
from arXiv · showhide
In recent years, significant attention has been directed toward the fifth generation of wireless broadband connectivity known as `5G`, currently being deployed by Mobile Network Operators. Surprisingly, there has been considerably less attention paid to `Wi-Fi 6`, the new IEEE 802.1ax standard in the family of Wireless Local Area Network technologies with features targeting private, edge-networks. This paper revisits the suitability of cellular and Wi-Fi in delivering high-speed wireless Internet connectivity. Both technologies aspire to deliver significantly enhanced performance, enabling each to deliver much faster wireless broadband connectivity, and provide further support for the Internet of Things and Machine-to-Machine communications, positioning the two technologies as technical substitutes in many usage scenarios. We conclude that both are likely to play important roles in the future, and simultaneously serve as competitors and complements. We anticipate that 5G will remain the preferred technology for wide-area coverage, while Wi-Fi 6 will remain the preferred technology for indoor use, thanks to its much lower deployment costs. However, the traditional boundaries that differentiated earlier generations of cellular and Wi-Fi are blurring. Proponents of one technology may argue for the benefits of their chosen technology displacing the other, requesting regulatory policies that would serve to tilt the marketplace in their favour. We believe such efforts need to be resisted, and that both technologies have important roles to play in the marketplace, based on the needs of heterogeneous use cases. Both technologies should contribute to achieving the goal of providing affordable, reliable, and ubiquitously available high-capacity wireless broadband connectivity.
1. Introduction
The paper revisits whether 5G and Wi-Fi 6 will compete or complement one another as wireless connectivity expands across consumer, enterprise, and private-network settings.
- Earlier 3G and Wi-Fi were predominantly complementary, with Wi-Fi serving indoor hotspots and cellular supporting outdoor and mobile access.
- The debate is becoming more consequential because anticipated 5G applications include vertical industrial sectors and private networks, often indoors or on campuses.
- The research question is whether 5G and Wi-Fi 6 will remain complementary or whether substitution will give one technology greater prominence.
- The research community has not adequately examined how cellular and Wi-Fi may act as competitors in some contexts and complements in others.
- The paper compares 5G and Wi-Fi 6 using technical, trade-press, and academic perspectives, supported by the authors’ industry and policy expertise.
- It reviews demand-side changes, provides qualitative technology overviews, compares the technologies, and concludes with policy-oriented discussion.
2. Future demand-side changes affecting wireless connectivity
Wireless demand is rising because more devices and users generate more data, especially through video and IoT, while demanding stronger capacity, latency, and reliability.
- Most generated traffic will be served by Wi-Fi, with about one fifth served by cellular.
- The future of wireless connectivity will be shaped by more devices, changing device composition, greater data generation per device, and more users including connected things.
- Approximately 8 billion M2M and IoT connections in 2020 are projected to exceed 14 billion by 2023, led primarily by connected homes and workplaces.
- Video drives traffic growth: higher-quality services increase per-device demand, and video already accounts for over three quarters of consumer and household traffic.
- Minimum connection requirements rise from 3 Mbps for SD video to 5 Mbps for HD and 25 Mbps for UHD.
- Future applications may depend not only on traffic volume but also on guaranteed quality of service, because latency and variable reliability affect latency-sensitive services.
3. An overview of 5G technical features
5G combines enhanced broadband, low-latency reliable communications, and massive machine-type connectivity with architectural and radio innovations, but deployment introduces substantial practical constraints.
- 5G’s three key use cases are Enhanced Mobile Broadband, Ultra Reliable and Low Latency Communications, and Massive Machine Type Communications.
- Enhanced Mobile Broadband targets higher data rates, connection density, and mobility across indoor, outdoor, local, and wide-area scenarios.
- 5G aims to reduce latency through radio-access and core-network improvements together with edge computing and network virtualization.
- Massive machine-type communications extend IoT support toward many devices with lower costs, enhanced coverage, and long battery life.
- Key technical capabilities include mmWave frequencies, massive MIMO, small cells, advanced modulation, control/user-plane separation, beamforming, and full duplex.
- mmWave and small-cell deployment can require more antennas, increased blockage sensitivity, massive densification, and difficult spectrum, energy, and logistics management.
4. An overview of Wi-Fi 6 (802.11ax) technical features
Wi-Fi 6 introduces features aimed at improving throughput, spectral efficiency, dense-deployment performance, energy use, and coverage. Its architecture combines new multi-user transmission, power-saving, spatial-reuse, and mesh-network capabilities while preserving backward compatibility.
- Performance objectives: Wi-Fi 6 enhances nominal data rate by 37% compared to Wi-Fi 5 and targets 4x improvement in throughput and spectrum efficiency in dense deployments.These improvements use OFDMA, MU-MIMO, and spatial reuse.
- Deployment models: Wi-Fi mesh systems use a main hub and multiple linked nodes distributed through a building or home to improve speed, reliability, and signal coverage.This contrasts with the technical requirements of 5G deployment.
- Multi-user transmission: Wi-Fi 6 adds mandatory OFDMA support in both downlink and uplink, its first introduction to the Wi-Fi family.OFDMA divides bandwidth into resource units allocated to users according to their needs and channel conditions.
- Multi-user transmission: OFDMA can provide up to 4x throughput gain compared to OFDM by assigning single or multiple resource units to users.Allocation reflects data to transmit and available channel conditions such as SINR.
- Multi-user transmission: Wi-Fi 6 supports uplink and downlink MU-MIMO, enabling an access point to connect with several devices concurrently using up to 8 simultaneous beams.MIMO uses multiple antennas and spatial data streams to increase transmission rates.
- Energy and dense deployments: Target Wake Time increases device sleep periods by scheduling agreed time slots for exchanging data with an access point or other users.Wi-Fi 6 also introduces spatial reuse with BSS Colour to identify inter-BSS and intra-BSS frames and increase concurrent transmissions.
- Energy and dense deployments: Spatial reuse can provide a 30% throughput gain in outdoor dense deployments by allowing devices to abandon sufficiently interfering inter-BSS frames.The mechanism uses a 6-bit BSS Colour carried in the physical header.
5. Comparing and contrasting 5G and Wi-Fi 6
The paper compares 5G and Wi-Fi 6 across technical, use-case, spectrum, business-model, cost, and deployment dimensions. Their enhanced capabilities make them closer substitutes in some settings, but heterogeneous requirements favor coexistence, complementarity, and context-specific selection.
- Substitution and complementarity: 5G and Wi-Fi 6 enhancements narrow legacy differences and make the technologies closer substitutes for end-user and network-service demands.The comparison considers technical characteristics, use cases, spectrum, business models, cost, installation, and required skill levels.
- Substitution and complementarity: Both technologies can also provide unique and complementary capabilities for seamless network services, with devices dynamically using public cellular and Wi-Fi networks.Users may have multiple devices and radios, enabling simultaneous or dynamic use of both network families.
- Use-case differentiation: 5G is likely to remain preferred for wide-area, mobile, ubiquitous-connectivity applications such as autonomous vehicles, drones, and some smart-city or IoT uses.The paper associates this preference with dedicated or available spectrum resources and the needs of highly mobile or broad-coverage applications.
- Hybrid networks: Licensed and unlicensed spectrum expansion is enabling hybrid deployment models, including potential 5G and Wi-Fi 6 coexistence in the 6 GHz unlicensed band.These changes blur earlier public-private network boundaries.
- Cost and deployment: Wi-Fi 6 may be preferred for indoor and private local networks because its deployment and per-device costs are lower than cellular alternatives.Wi-Fi 6 chip prices are given as $12-18, while a 5G modem can add more than $100 to a device price.
- Overall assessment: Neither technology is expected to dominate because use cases have different mobility, coverage, cost, quality-of-service, and connectivity requirements.Fixed connectivity may also compete where mobility is unnecessary.
6. Discussion and conclusions
The paper concludes that 5G and Wi-Fi 6 will remain both competitors and complements, with their roles shaped by heterogeneous use cases, legacy trajectories, costs, and changing demand. 5G is likely to dominate wide-area connectivity, while Wi-Fi remains strongly favored indoors and businesses may deploy both.
- Demand and market evolution: Growing data traffic, higher-quality video, cloud applications, and changing work and social patterns will affect wireless demand and technology economics.These trends may alter the spatial and temporal use of wireless broadband and the associated economics of each technology.
- Competitive and complementary roles: 5G and Wi-Fi 6 are alternative or substitute options in many contexts, but complements in many others.Their differing legacy trajectories and focal usage scenarios produce relative advantages rather than a single universally dominant technology.
- Policy and future outlook: The paper argues against policies favoring one technology’s displacement of the other, because cost economics, deployment convenience, device capabilities, and sunk infrastructure costs sustain heterogeneous choices.Some devices will remain Wi-Fi-only or cellular-only, and path dependence makes wholesale transition costly except in specific circumstances.
- Deployment contexts: 5G remains the dominant wide-area technology, while Wi-Fi is difficult to displace indoors, particularly in homes.Cellular benefits from existing infrastructure that can be reused for upgrades, whereas indoor cellular deployment remains challenging and generally more expensive.
- Scope of the analysis: The paper evaluates the next decade of wireless broadband evolution as 5G and Wi-Fi 6 roll out and gain adoption, while acknowledging that their boundaries continue to blur.The authors present this evaluation as a contribution relevant to telecommunications policy and future competitive dynamics.