5G • 5G-Advanced (Rel-18)
HMD Power Optimization
Head-Mounted Display Thermal and Power Saving Profile
Hardware and protocol constraints optimized for head-mounted displays to prevent device overheating and maximize operating time.
Technical Explanation
Head-mounted displays face severe thermal constraints: skin contact limits front-chassis temperatures to 43°C, while lightweight designs cap battery size under 500 mAh. Rel-18 defines an HMD Power Profile that enables aggressive modem micro-sleeps, adaptive antenna panel disabling, and uplink power throttling during static head poses.
Key Functions
- Enforces strict modem thermal dissipation caps to protect user facial skin
- Disables unused RF transceiver chains when headsets are operating in static viewing modes
- Extends lightweight wearable headset battery life from 45 minutes to over 2 hours
- Employs intelligent sensor-triggered wake-up signaling from internal IMU chips
Specifications
3GPP TR 38.835, TS 38.306 (Rel-18)
Interfaces
Uu (MAC/RRC)
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