Uplink Channel Access Response for Directional Interference
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Solution Overview
Problem
In 5G wireless communication systems, the mismatch between directional channel sensing and transmission directions leads to performance degradation due to incorrect interference estimation, particularly in highly-directional beamforming at higher carrier frequencies like 60 GHz, where classical omni-directional channel sensing is insufficient.
Innovation Solution
The implementation of a channel access response (CARP) in uplink transmission that indicates channel sensing results at the receiver, allowing for accurate interference assessment and alignment with actual transmission directions, thereby improving channel access efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If omni-directional channel sensing is used in classical systems, then channel access can be performed, but interference estimation becomes inaccurate in highly-directional beamforming scenarios
Solution Approach 1:
The patent applies local quality by making the channel sensing directional rather than omnidirectional. The receiving device performs channel sensing in the same directional beamforming manner as transmission, allowing interference estimation to be adapted to specific spatial locations and directions, thereby improving measurement precision for directional beamforming scenarios
Solution Approach 2:
The patent inverts the traditional approach by having the receiving device perform channel sensing instead of the transmitting device. This inversion allows the receiver to accurately sense interference in the actual transmission direction, resolving the mismatch between omnidirectional sensing and directional transmission
2Reliability
If channel sensing direction does not align with transmission direction, then sensing can be performed independently, but interference estimation becomes incorrect
Solution Approach 1:
The patent implements feedback by having the receiving device send channel access response information back to the transmitting device. This feedback loop allows the transmitter to adjust its transmission based on the receiver's directional channel sensing results, ensuring that interference estimation aligns with actual transmission conditions and improving channel access reliability
Solution Approach 2:
The patent ensures that channel sensing is performed in the same local directional space as transmission by using identical beamforming configurations at both ends. This local quality matching ensures that interference estimation is accurate for the specific transmission direction, resolving the contradiction between sensing independence and estimation accuracy
Data Source
AI summary
Apparatuses and methods for channel access responses in uplink transmissions. A method of operating a user equipment (UE) includes receiving, from a base station (BS), a channel access request (CARQ) over a downlink channel and generating a channel access response (CARP). The CARP includes a response to information indicated in the CARQ. The method further includes including the CARP in uplink control information (UCI), determining a set of time or frequency domain resources for transmitting the UCI, and transmitting the UCI based on the determined set of time or frequency domain resources.