A Comprehensive Survey of 5G URLLC and Challenges in the 6G Era

Faisal Tariq; Kai-Kit Wong; Md. Emadul Haque; Md. Sakir Hossain; Muhammad Ali Imran; Muhammad R A Khandaker

REVIEW 3 major objections 6 minor 1 cited by

A Comprehensive Survey of 5G URLLC and Challenges in the 6G Era

T0 review · 3 major / 6 minor · reviewed 2026-08-05 · deepseek-v4-flash

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Pith's one-line read This survey aims to be the first complete map of URLLC, from short-packet physics to 6G research agendas.

desk verdict Useful, current survey with a real comprehensiveness claim that its own Table I undercuts; worth refereeing despite fixable errors. read the letter →

arxiv 2508.20205 v1 pith:IGXAIYJQ submitted 2025-08-27 cs.NI

Md. Emadul Haque , Faisal Tariq , Muhammad R A Khandaker , Md. Sakir Hossain , Muhammad Ali Imran , Kai-Kit Wong This is my paper · ORCID

classification cs.NI

keywords URLLC5GNewRadio6Gultra-reliablelow-latencycommunicationshort-packettransmissioncross-layerdesignmachinelearningwirelesssurvey

verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

Ultra-Reliable and Low-Latency Communication (URLLC) asks wireless systems to deliver roughly 99.999% reliability within about 1 ms, two goals that pull in opposite directions. The paper's central claim is that no existing survey has covered the full URLLC design space and that this article fills the gap by tracing the history, standards, layered techniques (PHY, MAC, cross-layer), machine learning, security, vertical use cases, and 6G directions. A sympathetic reader would take the paper as a structured reference map that collects the targets, the techniques proposed to meet them, and the open problems, so that a newcomer can see the whole landscape before diving into any single layer. The account is organized around the short-packet constraint: packets of roughly 20 bytes or less change how coding gain, control overhead, retransmission, and encryption behave, which is why the paper treats the problem layer by layer.

What carries the argument

The load-bearing mechanism is the URLLC KPI pair—≤1 ms end-to-end latency and reliability from (1−10⁻⁵) to (1−10⁻⁹)—together with the short-packet constraint it forces. Because packets shrink to a few tens of bytes, the traditional levers for reliability (coding gain, HARQ retransmission rounds, pilot/control overhead, cryptographic key length) all change behavior, so the survey organizes techniques by which layer absorbs the tension. Its second device is a layered taxonomy—PHY, MAC, cross-layer, machine learning, security—used to classify the literature, with a comparison table of prior surveys serving as the evidence that the gap exists.

What would settle it

Apply the paper's own six-column grid (PHY, MAC, cross-layer, machine learning, security, 6G overview) to every prior URLLC survey, including those not cited in the comparison table. If any one of them scores six of six—or if the table mischaracterizes [21], the closest prior candidate—the central 'no comprehensive survey exists' claim fails. A simpler observation would settle it: find one important URLLC subtopic (e.g., energy-efficiency co-design or positioning) that the survey itself does not cover; that shows 'comprehensive' is scope-dependent.

Watch

Extended reading notes

Core claim

The paper sets out to be the first survey that covers URLLC end to end: it traces the history and standards (3GPP Releases 15–18), collects latency and reliability targets across verticals (factory automation, intelligent transport, smart grid, smart city, tactile internet), then reviews the physical layer (frame structure, packet structure, waveforms, channel coding, MIMO, mmWave, diversity), MAC layer (scheduling, multi-connectivity), cross-layer design (ARQ/HARQ, retransmission, resource allocation), security, and machine-learning solutions. It closes by framing 6G challenges—0.1 ms user-plane latency, 99.99999% reliability, communication-control co-design, mobility, scalability, energy,

Load-bearing premise

The claim of comprehensiveness rests on an unstated assumption: that the prior surveys compared in the table were selected and characterized accurately enough to prove that none already covers all the same dimensions, and the paper gives no search or inclusion protocol to back that selection.

Editorial extensions

If this is right

A newcomer gets a structured map of the URLLC design space: frame structures, short-blocklength codes, scheduling, retransmission, multi-connectivity, ML, and security, all keyed to the same latency-reliability targets.
The paper's layered review implies that no single-layer fix suffices; meeting 1 ms and 99.999% requires joint PHY-MAC-cross-layer design, with machine learning increasingly used to predict and pre-empt delay.
3GPP Releases 15–18 form the current baseline, and the survey shows each release adding URLLC features—redundant transmission, sub-slot HARQ feedback, and traffic prioritization.
The 6G agenda is specified: sub-0.1 ms user-plane latency, 99.99999% reliability, communication-control co-design, and candidate technologies such as OTFS/DDAM, ISAC, RSMA, cell-free massive MIMO, and split learning.
If the taxonomy is complete, future work can position itself against a known checklist instead of rediscovering prior art.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

The comprehensiveness claim is testable and time-sensitive: the paper states no systematic search or inclusion protocol, so the 'gap' is an assertion about the literature as of its writing; a newer or non-indexed survey could already span all six dimensions.
The short-packet constraint likely binds harder than the survey frames it: ML-based prediction and split learning add their own signaling and model-exchange overhead, and the paper does not budget those against the 1 ms deadline.
The six-dimension taxonomy could serve as an evaluation checklist for future URLLC proposals, making the survey's structure a reusable artifact independent of its reference list.
An implicit consequence is that if 0.1 ms and 99.99999% are hard physical targets, incremental 5G tuning may plateau; the paper's 6G catalogue points toward a new air-interface paradigm rather than refinement of the current one.

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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Desk Editor's Note

read the letter

This is one of the more current URLLC surveys I've seen, with references stretching into 2024–2025 (ISAC, cell-free massive MIMO, OTFS, split learning). The layered organization—PHY, MAC, cross-layer—is sensible, the summary tables are genuinely helpful, and the 6G section covers ten enabling technologies with citations. If someone asked where to start reading on URLLC today, this would save them time.

But the central claim doesn't survive contact with the paper itself. The introduction says “there is no survey that comprehensively covers all the aspects of URLLC,” yet the related-work section describes Sutton et al. [21] as covering PHY/MAC, cross-layer, applications, and future directions—no ML, no 6G—while Table I gives [21] checkmarks for ML and 6G overview. That inconsistency directly weakens the justification for the paper's existence. Also, no search protocol or inclusion criteria is stated, so the 300+ reference selection can't be independently reproduced. For a survey whose whole point is filling a coverage gap, that's a notable omission.

There are minor but real editorial defects: duplicate references ([138]=[145], [143]=[146]), “ARQ/ARQ” in Section VIII-A where they mean ARQ/HARQ, “ultra low reliability” in Section III (should be “ultra high”), and a “1 µs” E2E delay for motion control in Section IV-A that contradicts the 1 ms figure given two sentences earlier. These are typo-level and fixable, but they matter in a survey where people will cite numbers.

The practical value is real: broad, current, and well-organized as a pointer list. The novelty framing is overreaching, but the underlying survey work is solid enough that a serious referee could turn it into something dependable. I'd send it to review with a request to fix Table I, state the search methodology, and clean up the typos. The thinking is clear, even if the claim is too strong.

Referee Report

3 major / 6 minor

Summary. This survey aims to provide a comprehensive treatment of URLLC in 5G and its evolution toward 6G. It is organized around a layered taxonomy: history, vertical use cases, challenges, physical layer techniques, MAC layer techniques, cross-layer designs, machine-learning approaches, and 6G research directions. The paper positions itself against ten prior surveys in Table I and claims that no existing survey covers all aspects of URLLC, with the stated contribution being to fill that gap. The survey draws on a large reference base and provides numerous summary tables and a taxonomy of techniques.

Significance. If the coverage claim is accurate, this would be a useful reference map for researchers entering the URLLC area, spanning PHY, MAC, cross-layer, security, machine learning, and 6G. The paper's strengths include its broad scope, the classification of prior surveys into a comparative table, the layered organization, and the compilation of recent results on topics such as cell-free massive MIMO, ISAC, OTFS, and federated reinforcement learning. These features make it potentially valuable as an entry point to the literature. However, the survey's primary contribution is its claim to comprehensiveness, and that claim currently rests on an internally inconsistent prior-survey comparison and an unreported selection methodology. The paper does not provide machine-checked artifacts, but it does offer a large curated bibliography and structured tables, which are useful if the accuracy issues are resolved.

major comments (3)

[Section II, Table I] The paper's central claim (Section I: "there is no survey that comprehensively covers all the aspects of URLLC") is supported only by Table I, but Table I is internally inconsistent with the text. For [21], the text credits only PHY/MAC protocols, a brief cross-layer overview, applications, and future directions, and explicitly says it overlooks recent 5G progress; the table nevertheless marks five dimensions (PHY, MAC, URLLC, Cross layer, Machine learning). Similarly, [30] is described as focused on FRL and MAC channel access, while the table marks PHY, MAC, URLLC, Cross layer and ML with only the ML dimension footnoted as "FRL only." No search protocol, database, or inclusion/exclusion criteria are given, so the completeness claim cannot be reproduced. This is load-bearing for the stated contribution. Please correct Table I to match the text or provide a verifiable protocol/audit, and
[Section VI-E and reference list] References [138] and [145] are the same paper (Tärneberg et al., SECON Workshops 2017), as are [143] and [146] (Vu et al., IEEE Communications Letters 2017). This is not merely editorial: the sentences citing [145] ("evaluated the performance bounds of massive MIMO") and [146] ("utility-delay control approach using Lyapunov technique") attribute findings that are not in the cited works. Table V likewise uses [138] and [143] as if distinct. Deduplicate and re-verify all affected attributions.
[Section IV-A] The vertical requirements contain a numeric error: motion control is stated to have "E2E delay of 1 µs", whereas the same subsection and Table II (and 3GPP TS 22.261) specify 1 ms. The following sentence "jitter of 10 1µs" is garbled. Since the paper's survey of vertical requirements is part of its content, this needs correction; please re-check all latency/reliability figures against the cited 3GPP documents.

minor comments (6)

[Section III] "ultra low latency and ultra low reliability" should read "ultra low latency and ultra high reliability" (or equivalent), given the surrounding discussion.
[Section V-C] Typos: "probelms" should be "problems", "alloction" should be "allocation". Similar typos appear in Section VII-C ("reduced-sised") and Section VII-B ("career aggregation" should be "carrier aggregation").
[Table I] The footnotes "1 Partial description of URLLC" and "2 FRL only" appear in cells but are not explained in the caption; it is unclear which rows/columns they apply to. Also, the table's checkmarks should be reconciled with the narrative descriptions of each survey.
[Section VI-C] "OFTS" in the sentence "OFTS provides the lowest latency" should be "OTFS". Also, "peak-to-average (PAPR)" should be expanded as "peak-to-average power ratio" on first use.
[Section II] The introduction contains "URRLLC" (should be "URLLC"). Please run a consistency check on terminology.
[Section IV-A] "user plain" appears repeatedly and should be "user-plane". Also, the phrase "1 µs" in the motion-control description is a candidate for the same correction already noted in the major comments.

Circularity Check

0 steps flagged · score 1.0 of 10

No significant circularity: the survey's synthesis rests on external literature; self-citations are contextual and not load-bearing.

full rationale

The paper's central claim (Section I) is that 'there is no survey that comprehensively covers all the aspects of URLLC' and that this survey fills that gap. This is an assertion about the surveyed literature, supported by the comparative Table I, not a result derived from the paper's own equations, fitted parameters, or normalizations. The paper is an attributive survey: each technical statement is traced to cited external works, and no derivation chain reduces to the paper's own inputs. Self-citations appear ([1] Tariq et al., [28] with M. A. Imran, [52] Imran et al.) but only as background/context for 6G visions, interference management, and verticals; they do not justify the comprehensiveness claim and are not invoked as uniqueness theorems or forced choices. The skeptic's concerns — an apparent inconsistency in Table I's characterization of prior survey [21] (machine-learning check vs. text that does not mention ML) and the absence of a stated search protocol — are correctness/reproducibility limitations, not circularity. They do not exhibit any step where a claimed output is equivalent by construction to an input. Therefore the paper falls in the normal non-circular range; score 1 reflects the presence of minor self-citations that are not load-bearing.

Assumptions & free parameters 0 free parameters · 3 assumptions · 0 invented entities

As a review, the paper introduces no free parameters and no invented entities. The load-bearing inputs are unverified summaries of other people's results: the 3GPP/ITU KPI definitions, the prior-survey comparison, and the accuracy of each cited technique description. That is the entire 'axiom' content of a survey.

assumptions (3)

domain assumption URLLC is defined by the ITU/3GPP KPI envelope: user-plane latency up to about 1 ms and reliability from 99.999% to 99.9999999% (Sections I and III).
The entire structure of the survey organizes techniques against these targets as stated in [12], [32], [84]; the targets are taken as given and not re-derived.
domain assumption The characterization of the prior survey literature in Table I is accurate, in particular that [21] does not provide the same comprehensive coverage as this paper.
The paper's stated gap (Section I, 'no survey that comprehensively covers all the aspects of URLLC') relies on this comparative judgment, but the table itself shows [21] with checks across five of six scope columns.
domain assumption Summaries of 3GPP Release 15-18 features and of the cited technical papers faithfully reflect the underlying standards and results.
Sections III, V, VI, VII condense standards and papers into short statements; the survey does not verify them against primary artifacts (simulations, code, or spec text).

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Cite this review

Pith. "Pith review of A Comprehensive Survey of 5G URLLC and Challenges in the 6G Era." pith.science (2026). https://pith.science/paper/IGXAIYJQ

@misc{pith2026250820205,
  author       = {Pith},
  title        = {Pith review of: A Comprehensive Survey of 5G URLLC and Challenges in the 6G Era},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/IGXAIYJQ}},
  note         = {Machine review of arXiv:2508.20205}
}

read the original abstract

As the wireless communication paradigm is being transformed from human centered communication services towards machine centered communication services, the requirements of rate, latency and reliability for these services have also been transformed drastically. Thus the concept of Ultra Reliable and Low Latency Communication (URLLC) has emerged as a dominant theme for 5G and 6G systems. Though the latency and reliability requirement varies from one use case to another, URLLC services generally aim to achieve very high reliability in the range of 99.999\% while ensuring the latency of up to 1 ms. These two targets are however inherently opposed to one another. Significant amounts of work have been carried out to meet these ambitious but conflicting targets. In this article a comprehensive survey of the URLLC approaches in 5G systems are analysed in detail. Effort has been made to trace the history and evolution of latency and reliability issues in wireless communication. A layered approach is taken where physical layer, Medium Access Control (MAC) layer as well as cross layer techniques are discussed in detail. It also covers the design consideration for various 5G and beyond verticals. Finally the article concludes by providing a detailed discussion on challenges and future outlook with particular focus on the emerging 6G paradigm.

Figures

Figures reproduced from arXiv: 2508.20205 by the authors.

**Figure 2.** Organisation of the paper. URLLC survey papers exist in the literature (see Table I). For example, in [26], the authors provide a comprehensive overview of URLLC and eMBB for Industrial IoT (IIoT), aiming to identify gaps between URLLC and eMBB services in 5G or beyond 5G (B5G) networks. As the stringent requirements of URLLC can degrade the performance of eMBB, the paper investigates the trade-off between the two.… view at source ↗

**Figure 3.** Evolution of URLLC latency and reliability requirements are much higher than the aforementioned systems. For example, automation control in general requires 1ms of latency and and 99.9999% reliability [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗

Figures from the paper (7 more)

**Figure 4.** Figure 4: 5G Verticals and their stakeholders. There are a number of potential factory functions which are highly reliable on URLLC such as remote monitoring, process control, motion control of the moving parts of the manufacturing equipment, mobile robots [56] and plant asset …

**Figure 5.** Figure 5: Latency and reliability requirements of various URLLC services [81]. [PITH_FULL_IMAGE:figures/full_fig_p008_5.png]

**Figure 6.** Figure 6: Time window of grant-based and grant-free scheme [PITH_FULL_IMAGE:figures/full_fig_p009_6.png]

**Figure 5.** Figure 5: Automotive use cases are an important consideration [PITH_FULL_IMAGE:figures/full_fig_p009_5.png]

**Figure 7.** Figure 7: Time and frequency domain view of 5G NR frame structure [102] [PITH_FULL_IMAGE:figures/full_fig_p012_7.png]

**Figure 8.** Figure 8: 6G enabling technologies intruder cannot intercept the VLC signal because it cannot traverse objects such as walls. In 2011, VLC was successfully used to enable access to the Internet. Despite this success, a lot of challenges ahead to make it suitable for widespread a…

**Figure 9.** Figure 9: URLLC Research Challenges. techniques. Security and privacy: As the number of connected devices and critical applications that rely on URLLC grows, ensuring robust security and privacy becomes crucial. Researchers must address the challenges of secure transmission, aut…

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Forward citations

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Reference graph

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Pith tools

Reviewed August 5, 2026 · model on record in the stance chip above.

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