NR RACH Power Control Under SAR Limits in ENDC Networks
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Solution Overview
Problem
In dual connectivity band combination (ENDC) networks, the random access channel (RACH) transmission power of new radio (NR) technology may not reach the base station due to power control algorithms, leading to unstable communication and potential radio link failure when the specific absorption rate (SAR) limit is reached, affecting network performance and user experience.
Innovation Solution
A transmission power control method that allocates a predetermined proportion of SAR to the first signal, allowing continuous communication in ENDC networks by determining the size of reference signals, device state index (DSI), and antenna characteristics to optimize transmission power allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the time averaged SAR method is applied to limit total RF exposure, then network performance and user experience are improved, but RACH transmission power of NR tech becomes insufficient to reach the base station
Solution Approach 1:
The patent changes the parameter allocation by introducing a dedicated SAR margin parameter (SAR_RACH) specifically for RACH transmissions. This allows the system to maintain the time averaged SAR limit while allocating a specific portion of the SAR budget to ensure sufficient RACH transmission power reaches the base station, resolving the power insufficiency issue.
Solution Approach 2:
The patent segments the total SAR budget into multiple components: SAR_RACH for random access channel transmissions, SAR_PUSCH for uplink data transmissions, and other transmission components. This segmentation allows each transmission type to have dedicated power guarantees, ensuring RACH transmissions can reliably reach the base station while maintaining overall SAR compliance.
2Object-affected harmful factors
If total transmission power is reduced when SAR reaches the limit, then SAR compliance is maintained, but connection of NR tech fails
Solution Approach 1:
The patent performs preliminary allocation of SAR margins before transmissions occur. By pre-allocating SAR_RACH margin and calculating available power for RACH transmissions in advance, the system ensures that when SAR limits are approached, RACH transmissions still have guaranteed power levels to establish connections, preventing connection failures due to sudden power reductions.
3Object-affected harmful factors
If transmission power of NR tech is reduced after SAR margin exhaustion, then SAR limit is maintained, but NR radio link failure occurs
Solution Approach 1:
The patent implements a feedback mechanism that continuously monitors SAR margin consumption and dynamically adjusts power allocation. When SAR margins are exhausted, the system uses the pre-allocated SAR_RACH reserve to maintain RACH transmission power, preventing radio link failures. The feedback loop ensures SAR compliance is maintained while communication stability is preserved through intelligent power management.
Data Source
AI summary
Disclosed are a transmission power control method and an electronic device for performing the same. The transmission power control method according to various embodiments may comprise: determining whether the magnitude of a reference signal received from a first base station for transmitting and receiving a first signal is greater than or equal to a set magnitude; determining a ratio of a specific absorption rate of the first signal according to a ratio set in the total specific absorption rate margin; and transmitting the first signal on the basis of the ratio of the specific absorption rate of the first signal.