Energy Detection Indicator for 5G Uplink Reliability
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Solution Overview
Problem
In 5G NR, wireless devices face challenges in distinguishing between cases where no HARQ feedback is received due to incorrect decoding or lack of energy detection by the network node, leading to inefficiencies in uplink transmission and potential errors in fulfilling ultra-reliable low-latency communication requirements.
Innovation Solution
Introducing an energy detection indicator, which is a new downlink control signaling arrangement that can be transmitted through the next available DCI or a separate PDSCH resource, indicating the detected energy level on assigned resources for uplink configured grant transmissions, allowing the wireless device to determine whether to retransmit based on energy levels below a predefined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If implicit HARQ acknowledgement is used without energy detection indication, then signaling load is reduced, but transmission reliability deteriorates because the wireless device cannot distinguish between correct decoding and lack of energy detection
Solution Approach 1:
The patent introduces an energy detection indicator as an intermediary signal that mediates between the network node and wireless device. This indicator provides the wireless device with information about whether the network node detected energy on the assigned resources, enabling the device to distinguish between correct decoding and lack of detection without requiring full decoding feedback, thus improving reliability while controlling signaling overhead
Solution Approach 2:
The patent applies partial action by providing only the necessary energy detection indication rather than full decoding feedback. The energy detection indicator provides just enough information for the wireless device to make retransmission decisions, avoiding the overhead of complete HARQ feedback while still improving transmission reliability
2Adaptability or versatility
If energy detection indicator is transmitted through next available DCI, then signaling flexibility is improved, but DCI processing complexity increases
Solution Approach 1:
The patent merges the energy detection indicator with the existing DCI structure by transmitting it through the next available DCI. This combining approach leverages the existing DCI processing infrastructure, providing signaling flexibility without requiring separate processing paths, thus balancing adaptability with processing complexity
3Productivity
If configured grant transmissions are used without energy detection, then uplink transmission efficiency is improved, but error rate increases due to inability to differentiate successful and unsuccessful transmissions
Solution Approach 1:
The patent implements feedback by transmitting the energy detection indicator from the network node to the wireless device. This feedback mechanism provides the device with information about whether its configured grant transmission was successfully detected, enabling informed retransmission decisions while maintaining the efficiency of configured grant operations
Data Source
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AI summary
Methods and apparatuses are disclosed for an energy detection indicator. In one embodiment, a method for a network node includes performing energy detection on assigned resources corresponding to a configured uplink grant for a wireless device, WD; and based on a level of the detected energy, one of: sending an energy 5detection indication corresponding to the assigned resources associated with the configured uplink grant; and demodulating and decoding a transport block associated with the configured uplink grant. In another embodiment, a method for a wireless device includes receiving an energy detection indication corresponding to assigned resources associated with a configured uplink grant; and determining whether to 10perform an uplink retransmission based at least in part on the received energy detection indication.