NTN Half-Duplex Resource Allocation for RedCap Terminals
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Solution Overview
Problem
Non-terrestrial network (NTN) systems experience significant transmission delays, leading to conflicts between uplink and downlink transmissions in half-duplex mode, particularly for RedCap devices, which can result in missed opportunities for data reception and reduced throughput.
Innovation Solution
A method where a terminal device determines a dedicated resource for half-duplex communication based on first indication information, preventing conflicts by ensuring uplink and downlink operations are properly synchronized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If half-duplex mode is used in NTN systems, then device complexity is reduced, but transmission conflicts occur between uplink and downlink
Solution Approach 1:
The patent segments communication resources by introducing dedicated half-duplex communication resources separate from full-duplex resources. Terminal devices are divided into different groups (half-duplex capable devices and full-duplex devices) that use different resource sets, preventing transmission conflicts while maintaining half-duplex operation benefits.
Solution Approach 2:
The network device performs preliminary configuration by indicating dedicated half-duplex communication resources to terminal devices before actual communication occurs. This advance resource allocation ensures that terminal devices know which resources to use for uplink transmission and downlink reception, preventing conflicts before they happen.
2Reliability
If dedicated half-duplex resources are allocated, then transmission conflicts are prevented, but resource utilization efficiency decreases
Solution Approach 1:
The patent creates a universal resource allocation framework where the network device can dynamically indicate which terminal devices should use dedicated half-duplex resources versus shared full-duplex resources. This multi-functionality allows the system to adapt resource usage based on actual communication needs, preventing conflicts for half-duplex devices while maintaining high utilization for full-duplex devices.
Solution Approach 2:
The resource allocation is dynamic rather than static. The network device can change the indication information to adjust which terminal devices use dedicated half-duplex resources based on current network conditions, traffic patterns, and device capabilities, optimizing resource utilization while preventing conflicts as conditions change.
3Adaptability or versatility
If timing advance is not aligned between network device and terminal device, then synchronization flexibility is improved, but transmission conflicts increase in half-duplex mode
Solution Approach 1:
The patent introduces dedicated half-duplex communication resources as an intermediary layer between the network device and terminal devices. These intermediate resources are specifically designed to accommodate timing misalignment by providing separate uplink and downlink resource sets that don't require precise timing synchronization, thus mediating the conflict between flexibility and reliability.
Data Source
AI summary
Disclosed are a method for wireless communication, a terminal device, and a network device. One example method includes: determining, by a first terminal device based on first indication information, a first resource related to half-duplex communication, wherein the first terminal device is a reduced capability (RedCap) device, the first resource is used by the first terminal device to perform at least one of uplink transmission or downlink reception in a non-terrestrial network (NTN), wherein the first resource is a time-frequency resource and is pre-configured, and the first resource comprises a plurality of random access channel occasion (ROs), and at least two ROs in the plurality of ROs respectively correspond to different synchronization signal blocks (SSBs).