Uplink Channel Transmission with Resource Cancellation for Multi-Slot NR
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Solution Overview
Problem
In the New Radio (NR) system, there is a lack of defined methods for performing multi-slot uplink transmission when time-domain resources conflict with resources for other services, particularly for Uplink Control Channel (PUCCH) and Physical Random Access Channel (PRACH) transmissions, and existing channel estimation techniques are inadequate for coverage enhancement.
Innovation Solution
A channel transmission method that involves determining target time-frequency resources for transmission, canceling conflicting resources, and applying joint or independent channel estimation based on predefined rules or signaling to ensure reliable URLLC service transmission while minimizing impact on uplink coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multi-slot uplink transmission is used to improve coverage enhancement, then uplink coverage is improved, but time-domain resource conflicts with other services (PUCCH, PRACH) occur
Solution Approach 1:
The network device sends indication information in advance to the terminal device, specifying which time-domain resources should be cancelled. This preliminary action allows the terminal to proactively avoid resource conflicts before they occur, enabling both multi-slot transmission for coverage enhancement and proper resource allocation for other services without actual conflicts
Solution Approach 2:
The system dynamically adjusts resource allocation by allowing the network device to flexibly indicate different cancellation patterns based on current service requirements. The terminal device adapts its transmission by cancelling specific repetitions or portions of multi-slot transmissions according to the received indication information, enabling dynamic resource management that balances coverage enhancement with other service needs
2Reliability
If channel transmission is cancelled on conflicting resources to ensure URLLC service, then URLLC reliability is improved, but uplink coverage enhancement is degraded
Solution Approach 1:
Instead of cancelling entire multi-slot transmissions, the system applies partial cancellation by selectively removing only the specific repetitions or time-domain resources that conflict with URLLC services. This partial action maintains sufficient transmission diversity for coverage enhancement while clearing the path for URLLC transmissions, achieving both goals without full sacrifice of either
Solution Approach 2:
The multi-slot transmission is segmented into individual repetitions or time-domain units that can be independently controlled. The network device can indicate cancellation of specific segments rather than the entire transmission, allowing fine-grained resource management that preserves coverage enhancement through remaining segments while ensuring URLLC service on cancelled segments
Data Source
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AI summary
Disclosed in the present application is a channel transmission method, the method comprising: a terminal device determining a target time-frequency resource on the basis of a first time-frequency resource used for channel transmission and a second time-frequency resource indicated by first indication information; and cancelling channel transmission on the target time-frequency resource, wherein the first time-frequency resource comprises a time-frequency resource corresponding to joint channel estimation and/or a time-frequency resource corresponding to multi-slot transmission of a transport block. Further disclosed in the present application are another channel transmission method, an electronic device, and a storage medium.