PUSCH UCI Signaling for UE COT Sharing in Downlink Data
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Solution Overview
Problem
There is no effective solution for how a network device shares Channel Occupancy Time (COT) of User Equipment (UE) for downlink data transmission in unlicensed frequency bands, leading to uncertainty and inefficiency in channel availability.
Innovation Solution
The UE sends Physical Uplink Shared CHannel (PUSCH) bearing Uplink Control Information (UCI) to indicate remaining Maximum Channel Occupancy Time (MCOT) or a target time period, allowing the network device to share the COT for downlink data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device performs independent channel listening before downlink transmission, then channel access reliability is improved, but transmission delay increases and data transmission efficiency deteriorates
Solution Approach 1:
The network device performs channel listening in advance during uplink transmission periods and stores the channel status and occupancy time information. When downlink transmission is needed, the pre-acquired channel access rights are utilized immediately, eliminating the need for additional listening procedures and reducing transmission delay while maintaining reliability
Solution Approach 2:
The patent enables continuous channel occupancy by allowing the network device to maintain channel access rights across uplink and downlink transmission periods. The channel listening action performed during uplink transmission continues to be valid for subsequent downlink transmission, ensuring uninterrupted useful action without requiring repeated channel access procedures
2Productivity
If the network device shares UE's COT for downlink transmission, then data transmission efficiency is improved, but channel occupancy time management complexity increases
Solution Approach 1:
The UE feeds back channel occupancy time information to the network device through uplink control information. This feedback mechanism provides the network device with accurate channel status data, enabling efficient COT sharing while managing complexity through structured information exchange rather than requiring the network device to independently track all channel parameters
Solution Approach 2:
The UE acts as an intermediary that manages the channel occupancy time information and communicates it to the network device. This intermediary role simplifies the network device's burden by having the UE handle the detailed tracking and reporting of COT parameters, reducing the complexity of COT management at the network device while still enabling efficient sharing
Data Source
AI summary
An information indicating method, a device and a non-transitory computer-readable medium, are provided. The non-transitory computer-readable medium storing instructions that, when executed by a processor of a network device, cause the processor to perform operations including: sending a Physical Uplink Shared CHannel (PUSCH). The PUSCH bears Uplink Control Information (UCI), the UCI is used to indicate: a target time period, the target time period includes: a time period for allowing a network device to transmit downlink data within a Channel Occupancy Time (COT) within which uplink transmission is performed, the PUSCH is transmitted by the UE on a configured grant resource, the UCI carried by each PUSCH transmitted on the configured grant resource is used to indicate an offset time, and the offset time is the time from the end position or the start position of the PUSCH to the start position of the target time period.