Extended UL Subframe Reference Signal Allocation for TDD Switching Delay
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Solution Overview
Problem
Current communication systems face challenges in balancing the uplink and downlink switching periods in TDD radio frames, leading to reduced transmission amounts and throughput, which is not optimal for both MBB and URLLC scenarios.
Innovation Solution
The proposed solution involves allocating the switching period every subframe and the guard symbol every two subframes, with a method that includes aggregating the UpPTS and a special subframe as an extended UL subframe, and optimizing the allocation of reference signals and PUSCH within these frames to improve uplink transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a guard symbol is allocated in every UL-DL switching period to satisfy URLLC scenario, then switching delay is reduced, but transmission amount and throughput are reduced
Solution Approach 1:
The patent segments the guard symbol allocation by frequency, dividing the uplink subframe into multiple frequency regions (first frequency region and second frequency region). Different guard symbol configurations are applied to different regions, allowing some regions to have reduced or no guard symbols while others maintain full guard symbols, thus reducing overall transmission delay without completely sacrificing transmission capacity.
Solution Approach 2:
The patent applies local quality by configuring different guard symbol requirements for different frequency regions within the same uplink subframe. The first frequency region may have reduced guard symbols or no guard symbols for low-latency traffic, while the second frequency region maintains standard guard symbols for reliability, optimizing both delay and throughput locally in different spectral regions.
2Loss of time
If guard symbol is allocated in every UL-DL switching period, then switching delay is reduced, but transmission amount is reduced
Solution Approach 1:
The patent segments the uplink transmission resources by frequency, creating distinct regions with different guard symbol configurations. This allows the system to reduce the total quantity of transmitted data by eliminating or reducing guard symbols in specific frequency regions where latency is critical, while maintaining adequate guard symbols in other regions.
Solution Approach 2:
Different frequency regions are assigned different guard symbol densities based on local traffic requirements. The first frequency region targeted for low-latency communication has reduced guard symbols, thereby increasing the effective transmission amount in that region, while the second frequency region maintains standard configuration.
3Loss of time
If switching period is shortened to satisfy URLLC scenario, then HARQ RTT is reduced, but transmission amount is reduced due to guard symbol allocation
Solution Approach 1:
The patent segments the frequency spectrum to allow different HARQ RTT configurations in different frequency regions. The first frequency region can operate with shorter effective HARQ RTT by reducing or eliminating guard symbols, while the second frequency region maintains standard HARQ timing, thus achieving overall reduced latency without proportionally reducing total transmission capacity.
Solution Approach 2:
The patent applies local quality by enabling different guard symbol configurations in different frequency regions, allowing the first frequency region to achieve lower HARQ RTT with reduced guard symbols while the second frequency region maintains standard HARQ timing characteristics, optimizing both latency and throughput simultaneously.
Data Source
AI summary
In an uplink transmission method of a first communication node, the first communication node receives a reference signal configuration for an UpPTS (uplink pilot time slot) from a second communication node when the UpPTS of a special subframe and a first uplink (UL) subframe are aggregated as an extended UL subframe. Also, the first communication node allocates a reference signal to the first UL subframe of the UpPTS and the first UL subframe based on the reference signal configuration when a number of time domain symbols belonging to the UpPTS is a predetermined number or less.