5G PUSCH Overlap Handling via TTI Prioritization
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Solution Overview
Problem
Current 5G technology faces challenges in managing the overlap of physical uplink shared channels (PUSCHs) with different transmission time intervals (TTIs) during agreed transmission times, leading to inefficiencies in information transmission due to the lack of effective solutions for handling overlapping TTI lengths.
Innovation Solution
The method involves a transmitting terminal and a receiving terminal that use a preset or base station-indicated transmission/receiving mode to manage the overlap by prioritizing the PUSCH with the minimum TTI length, deferring or abandoning transmissions of other PUSCHs, and using interleaving matrices to puncture and transmit information on a single carrier wave, ensuring efficient data transmission without disrupting control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transmission time of multiple PUSCHs with different TTI lengths overlaps, then the system supports diverse service requirements (low latency and high reliability), but the transmission efficiency deteriorates due to lack of effective handling mechanisms
Solution Approach 1:
The patent changes the TTI length parameter dynamically by introducing short TTI (sTTI) configurations (2-symbol or 7-symbol TTI) alongside the traditional 1ms TTI. This allows the system to adapt transmission parameters based on service requirements, achieving both low latency (via sTTI) and maintaining backward compatibility (via 1ms TTI), thereby resolving the contradiction between adaptability and transmission efficiency
Solution Approach 2:
The patent implements dynamic switching between different TTI lengths (1ms TTI and sTTI) based on service type and channel conditions. The network can dynamically configure and switch TTI lengths for different UEs or different transmissions, enabling the system to respond flexibly to varying service requirements while optimizing overall transmission efficiency through adaptive parameter adjustment
2Loss of time
If the TTI length is reduced to 0.5 ms or 1-2 OFDM symbols, then the transmission delay is exponentially reduced, but the system complexity increases due to the need to support multiple TTI lengths and dynamic switching
Solution Approach 1:
The patent segments the TTI structure into different length configurations (1ms TTI, 2-symbol sTTI, 7-symbol sTTI) that can be independently configured and activated. This segmentation allows the system to support multiple TTI lengths without requiring complete redesign of the frame structure, reducing implementation complexity while achieving low latency transmission through selective use of shorter TTI segments
Solution Approach 2:
The patent performs preliminary configuration of sTTI parameters and switching rules before actual transmission. The network pre-configures sTTI resources, determines switching criteria, and establishes handling procedures in advance, which simplifies real-time decision-making and reduces operational complexity during dynamic TTI switching while maintaining low latency performance
3Adaptability or versatility
If multiple PUSCHs with different TTI lengths are transmitted simultaneously, then the service diversity is enhanced, but the transmission reliability deteriorates due to resource conflicts and interference
Solution Approach 1:
The patent resolves resource conflicts by introducing frequency domain separation as an additional dimension. Different TTI lengths can be allocated to different frequency resources (resource blocks), allowing simultaneous transmission without time-domain interference. This dimensional separation maintains service diversity while ensuring transmission reliability by eliminating resource conflicts between different TTI configurations
Data Source
AI summary
A method for transmitting information, includes: transmitting on one carrier wave according to at least one of a preset transmission mode and a transmission mode indicated by a base station eNB when agreed transmission time of two or more physical uplink shared channels PUSCH overlaps.