HD-FDD Physical Resource Conflict Resolution With Slot Format Indicators
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Solution Overview
Problem
The implementation of Half Duplex Frequency Division Duplex (HD-FDD) mode in Reduced Capability User Equipment (RC-UE) leads to contention problems between uplink transmission and downlink reception, particularly when RC-UE is configured with low latency services like URLLC, as HD-FDD devices cannot transmit and receive simultaneously, causing intra-UE HD-FDD collisions.
Innovation Solution
A method for resolving conflicts between overlapping uplink and downlink resources in HD-FDD devices by using slot format indicators (SFIs) to determine the use of each resource based on their format, allowing the device to either transmit or receive by combining SFIs and applying a predetermined rule to resolve collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If HD-FDD mode is implemented in RC-UE to reduce device complexity, then hardware complexity is reduced, but resource conflicts occur between uplink transmission and downlink reception
Solution Approach 1:
The patent implements dynamic resource allocation by introducing format indicators that can be dynamically configured for different time slots. The network can dynamically indicate whether physical resources are allocated for uplink or downlink by changing the format indicator values, allowing the system to adapt resource usage patterns in real-time based on traffic requirements, thereby resolving conflicts without requiring complex hardware filtering
Solution Approach 2:
The patent changes the parameter of resource format indication by introducing a format indicator that specifies whether physical resources are for uplink or downlink. By modifying this parameter dynamically through RRC signaling or DCI, the system can resolve resource conflicts by clearly defining the intended direction (UL/DL) for each time slot, eliminating ambiguity for HD-FDD devices
2Productivity
If uplink and downlink resources overlap in time for HD-FDD devices, then resource utilization efficiency is improved, but transmission reliability deteriorates due to inability to transmit and receive simultaneously
Solution Approach 1:
The patent applies preliminary action by configuring format indicators in advance through RRC signaling or indicating them dynamically before resource allocation through DCI. This preliminary definition of resource formats allows HD-FDD devices to know in advance whether to transmit or receive in each time slot, enabling efficient overlapping resource allocation while maintaining reliability through clear prior instructions
Solution Approach 2:
The network provides feedback through format indicators that inform the UE about the intended direction of physical resources. This feedback mechanism allows the UE to correctly interpret overlapping resource allocations and adjust its transmission/reception behavior accordingly, ensuring reliable communication while maintaining high resource utilization
Data Source
AI summary
A communications device operating according to a Half Duplex Frequency Division Duplex mode of operation (HD-FDD) is configured to transmit and/or receive data in a wireless communications network. The communications device is configured to receive from the wireless communications network a first allocation of first physical resources of an uplink channel of a wireless access interface provided by the wireless communications network for transmitting uplink data to the wireless communications network, and to receive from the wireless communications network a second indicator of second physical resources of a downlink channel of the wireless access interface for receiving downlink data from the wireless communications network.