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Reevaluating Bluetooth Low Energy for Ingestible Electronics

Ziyao Zhou, Zhuoran Sun, Xinyi Shen, Yang Li, Zhenhao Shi, Yixuan Yu, Hen-Wei Huang

TL;DR

The study addresses whether Bluetooth Low Energy can be practical for ingestible devices, challenging the assumption that 2.4 GHz tissue attenuation makes BLE unsuitable. By benchmarking BLE against sub-GHz radios (433/915 MHz) in tissue-mimicking media and augmenting BLE with a front-end amplifier, the authors quantify power, throughput, latency, and integration trade-offs. They find that for most ingestible sensing tasks with throughput below $100$ kbps, BLE consumes less power and delivers lower end-to-end latency than sub-GHz options, while remaining compatible with standard computing infrastructure and smartphone ecosystems. These results position BLE as a scalable, translatable wireless solution for next-generation ingestible electronics, thanks to compact antenna form factors and mature security/update capabilities.

Abstract

Bluetooth Low Energy (BLE) has been widely adopted in wearable devices; however, it has not been widely used in ingestible electronics, primarily due to concerns regarding severe tissue attenuation at the 2.4 GHz band. In this work, we systematically reevaluate the feasibility of BLE for ingestible applications by benchmarking its performance against representative sub-GHz communication schemes across power consumption, throughput, tissue-induced attenuation, latency, and system-level integration constraints. We demonstrate that incorporating an RF amplifier enables BLE to maintain robust communication links through tissue-mimicking media while preserving favorable energy efficiency. We further quantify the relationship between throughput and energy consumption over a wide operating range and demonstrate that, for the majority of ingestible sensing applications with throughput requirements below 100 kbps, BLE achieves substantially lower power consumption than sub-GHz alternatives. End-to-end latency measurements show that BLE offers significantly lower latency than sub-GHz solutions due to its native compatibility with modern computing infrastructure. Finally, we analyze antenna form factor and ecosystem integration, highlighting the mechanical and translational advantages of BLE in ingestible system design. Collectively, these results demonstrate that BLE, when appropriately configured, represents a compelling and scalable wireless communication solution for next-generation ingestible electronics.

Reevaluating Bluetooth Low Energy for Ingestible Electronics

TL;DR

The study addresses whether Bluetooth Low Energy can be practical for ingestible devices, challenging the assumption that 2.4 GHz tissue attenuation makes BLE unsuitable. By benchmarking BLE against sub-GHz radios (433/915 MHz) in tissue-mimicking media and augmenting BLE with a front-end amplifier, the authors quantify power, throughput, latency, and integration trade-offs. They find that for most ingestible sensing tasks with throughput below kbps, BLE consumes less power and delivers lower end-to-end latency than sub-GHz options, while remaining compatible with standard computing infrastructure and smartphone ecosystems. These results position BLE as a scalable, translatable wireless solution for next-generation ingestible electronics, thanks to compact antenna form factors and mature security/update capabilities.

Abstract

Bluetooth Low Energy (BLE) has been widely adopted in wearable devices; however, it has not been widely used in ingestible electronics, primarily due to concerns regarding severe tissue attenuation at the 2.4 GHz band. In this work, we systematically reevaluate the feasibility of BLE for ingestible applications by benchmarking its performance against representative sub-GHz communication schemes across power consumption, throughput, tissue-induced attenuation, latency, and system-level integration constraints. We demonstrate that incorporating an RF amplifier enables BLE to maintain robust communication links through tissue-mimicking media while preserving favorable energy efficiency. We further quantify the relationship between throughput and energy consumption over a wide operating range and demonstrate that, for the majority of ingestible sensing applications with throughput requirements below 100 kbps, BLE achieves substantially lower power consumption than sub-GHz alternatives. End-to-end latency measurements show that BLE offers significantly lower latency than sub-GHz solutions due to its native compatibility with modern computing infrastructure. Finally, we analyze antenna form factor and ecosystem integration, highlighting the mechanical and translational advantages of BLE in ingestible system design. Collectively, these results demonstrate that BLE, when appropriately configured, represents a compelling and scalable wireless communication solution for next-generation ingestible electronics.
Paper Structure (11 sections, 3 figures, 2 tables)

This paper contains 11 sections, 3 figures, 2 tables.

Table of Contents

  1. Introduction
  2. Methodology
  3. Transmission of BLE and the sub-GHz module in simulated human-body environments
  4. Relationship between throughput and power consumption in BLE and the sub-GHz module
  5. End-to-end communication latency of BLE and sub-GHz systems
  6. Results and Discussion
  7. Transmission of BLE and the sub-GHz module in simulated human-body environments
  8. Relationship between throughput and power consumption in BLE and the sub-GHz module
  9. End-to-end communication latency of BLE and sub-GHz systems
  10. Mechanical design and ecosystem integration advantages of BLE
  11. Conclusion

Figures (3)

  • Figure 1: Comparison of BLE and Sub-GHz technologies, highlighting five aspects (energy consumption, in vivo signal strength, latency, antenna size, and ecosystem) in which BLE demonstrates advantages under specific use cases. The 22% CAGR denotes the projected compound annual growth rate of shipments of single-mode BLE devices.
  • Figure 2: Comparison of BLE with TXP of (a) 20 dBm and (b) 8 dBm as well as the sub-GHz of (c) 433 MHz and (d) 915 MHz transmission characteristics, such as throughput, RSSI, and power consumption in air and at various water depths.
  • Figure 3: Comparison of power consumption versus throughput for BLE and sub-GHz communication systems.