UE Receiver-Side Assistance Across Uplink Opportunities for COT Sharing
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Solution Overview
Problem
In wireless communications, particularly in unlicensed radio frequency spectrum bands, there is a mismatch between transmitter and receiver interference conditions due to mismatched channel sensing, leading to potential interference during downlink transmissions.
Innovation Solution
User Equipment (UE) performs Clear Channel Assessment (CCA) before each uplink transmit opportunity and transmits receiver-side assistance information to indicate a Channel Occupancy Time (COT) initiation, allowing Base Stations (BS) to adjust transmissions based on timely and accurate receiver-side feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitter performs channel sensing without receiver-side feedback, then the transmission process is simple and fast, but interference conditions at the receiver are not accurately known leading to potential interference
Solution Approach 1:
The patent implements receiver-side feedback by having the UE perform CCA and transmit assistance information to the gNB. This feedback mechanism allows the transmitter to know the actual interference conditions at the receiver side, resolving the mismatch between transmitter and receiver channel sensing results and improving downlink transmission reliability.
Solution Approach 2:
The UE performs CCA and determines COT initiation in advance before the actual downlink transmission. By transmitting receiver-side assistance information beforehand, the gNB can adjust its transmission parameters proactively, preventing interference issues rather than reacting to them after they occur.
2Reliability
If the UE transmits receiver-side assistance information to indicate COT initiation, then interference mitigation is improved, but additional signaling overhead is introduced
Solution Approach 1:
The receiver-side assistance information serves multiple functions: it indicates COT initiation, provides interference condition feedback, and enables the gNB to adjust transmission parameters. By consolidating these functions into a single signaling mechanism, the patent reduces overall signaling overhead while achieving comprehensive interference mitigation.
3Reliability
If multiple uplink transmit opportunities are provided for COT indication, then the probability of successful COT indication increases, but the time and resources required for transmission increase
Solution Approach 1:
The patent provides multiple periodic uplink transmit opportunities for the UE to indicate COT initiation. This periodic structure allows the gNB to monitor for COT indications at regular intervals, increasing the probability of successful reception while maintaining a predictable and efficient time schedule that minimizes overall transmission time.
Data Source
AI summary
This disclosure provides systems, methods, and apparatuses for sharing a user equipment (UE)-initiated channel occupancy time (COT) with a base station (BS) by transmitting receiver-side assistance information on an uplink shared channel of an unlicensed radio frequency spectrum band. In some aspects, the UE may perform a clear channel assessment (CCA) prior to an uplink transmit opportunity, and if the CCA is successful, transmit the receiver-side assistance information on the uplink shared channel to share the COT with a BS. Multiple uplink transmit opportunities may be indicated to the UE send the receiver-side assistance information. In some examples, the uplink transmit opportunities may be configured grant occasions for a configured grant or scheduled by downlink control information. By transmitting to the BS, the UE may share the COT with the BS, and the BS may send downlink data to the UE during the COT.