Default TDRA Table Timing Offset for 5G NR
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in accurately determining timing offsets for higher frequency bands, particularly in 5G New Radio (NR) systems, due to the short slot durations and less frequent PDCCH monitoring occasions associated with large subcarrier spacings, which affect the scheduling of PDSCH and PUSCH communications.
Innovation Solution
The implementation of a default Time Domain Resource Assignment (TDRA) table that adjusts timing offsets based on subcarrier spacing, allowing for larger possible values of k0 and k2 parameters to accommodate the shorter slot durations and more flexible scheduling in higher frequency bands, enabling accurate timing offset determination for PDCCH, PDSCH, and PUSCH communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a default TDRA table is implemented to accommodate larger timing offsets for higher frequency bands, then timing offset determination accuracy is improved, but device complexity increases due to additional configuration parameters and tables
Solution Approach 1:
The patent applies preliminary action by pre-configuring default TDRA tables with appropriate timing offset values for different subcarrier spacings before RRC configuration is received. This allows the UE to determine timing offsets for PDCCH, PDSCH, and PUSCH communications without requiring complex real-time calculations or additional RRC configuration parameters, thereby improving timing offset determination accuracy while avoiding increased device complexity
Solution Approach 2:
The patent implements parameter changes by adjusting the k0 and k2 parameters in the TDRA table based on subcarrier spacing values. For larger subcarrier spacings (e.g., 120 kHz, 240 kHz, 480 kHz) used in higher frequency bands, the TDRA table is configured with larger timing offset values to account for shorter slot durations. This dynamic parameter adjustment enables accurate timing offset determination across different frequency bands without requiring complex additional configurations
2Adaptability or versatility
If larger k0 and k2 parameter values are allowed in the TDRA table, then scheduling flexibility is improved for short slot durations, but the risk of timing errors and communication failures increases
Solution Approach 1:
The patent applies dynamics by making the TDRA table configurable based on subcarrier spacing. The k0 and k2 parameters are dynamically adjusted according to the specific subcarrier spacing being used (15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, or 480 kHz). This allows the system to optimize timing offsets for each frequency band while maintaining reliability through controlled, standardized parameter values rather than allowing arbitrary large values
Solution Approach 2:
The patent implements feedback mechanisms through the standardized TDRA table configuration that provides reliable timing offset values for different subcarrier spacings. The network can configure appropriate k0 and k2 values based on the operating frequency band, and the UE follows these configurations, creating a feedback loop that ensures both scheduling flexibility and communication reliability by preventing timing errors from uncontrolled parameter values
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a network node may transmit, and a user equipment (UE) may receive, a physical downlink control channel (PDCCH) that includes a grant for a communication scheduled via the PDCCH prior to a radio resource control configuration indicating a timing offset between the PDCCH and the communication scheduled via the PDCCH. The UE and/or the network node may determine a timing offset between the PDCCH and the communication scheduled via the PDCCH based at least in part on a default time domain resource assignment table for a subcarrier spacing associated with the communication. Numerous other aspects are described.