5G UE HD-FDD Timing Offset Configuration
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Solution Overview
Problem
Current NR systems do not support Half Duplex Frequency Division Duplex (HD-FDD) UE, leading to inefficiencies and performance issues due to differences in uplink and downlink frequencies, resulting in a 1 millisecond gap needed for switching between channels, which affects transmission and reception performance.
Innovation Solution
A method where the UE transmits a first message to the base station containing UE capabilities, and receives a second message with a time domain resource scheduling indication, allowing for optimized channel transmission based on predefined or pre-configured mapping relationships, thereby improving the efficiency of UEs with different capabilities and reducing the impact on high-capacity UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the system uses different uplink and downlink frequencies for HD-FDD UE, then frequency division duplexing is achieved, but a 1 millisecond switching gap is required between channels
Solution Approach 1:
The patent changes the time domain parameters by introducing flexible timing offsets (K2, K0) that can be configured based on UE capabilities. This allows the system to adjust the timing relationship between scheduling signals and data transmissions, eliminating the fixed 1 millisecond switching gap while supporting HD-FDD operations.
Solution Approach 2:
The patent implements dynamic timing adjustments where the time offset between uplink and downlink transmissions is no longer fixed but can be dynamically configured based on UE capability information. This dynamic approach allows the system to adapt the switching timing to minimize gaps while maintaining HD-FDD functionality.
2Device complexity
If the system configures uniform time domain resources for all UEs, then scheduling is simplified, but UEs with different capabilities experience performance degradation
Solution Approach 1:
The patent applies local quality by configuring time domain resources differently for different UE capability groups. Instead of uniform configuration, the system provides tailored timing offsets and resource allocations matched to specific UE capabilities, thereby optimizing transmission performance for each UE type without significantly increasing overall system complexity.
Solution Approach 2:
The patent segments the UE population into different capability groups (e.g., HD-FDD capable vs. not capable) and applies different time domain resource configurations to each segment. This segmentation allows the system to maintain simple uniform configuration for most UEs while providing specialized optimized configurations for specific UE types.
3Reliability
If the system adds capability checking and customized configuration for HD-FDD UEs, then transmission performance improves, but system complexity increases
Solution Approach 1:
The patent implements preliminary action by having UEs report their capability information (including HD-FDD support) during the initial random access phase. This early declaration of capabilities allows the base station to pre-configure appropriate time domain resources before actual data transmission begins, avoiding the need for complex runtime capability checking and reconfiguration.
Data Source
AI summary
The disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method performed by a user equipment (UE) comprises transmitting, to a base station, a random access preamble and capability information of the UE; receiving, from the base station, a random access response including time domain scheduling information being based on the capability information; and transmitting, to the base station, data based on the time domain scheduling information.