Mixed Format Uplink Repetitions for Orphaned Symbols
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Solution Overview
Problem
Wireless communication systems face inefficiencies in uplink channel repetitions due to orphaned symbols, where a single symbol remains after a transmission time interval boundary, leading to mismatched formats that result in dropped or skipped data, causing resource wastage and transmission failures.
Innovation Solution
Implementing mixed format techniques where a user equipment (UE) receives configuration parameters to format a first portion of a message before a slot boundary using a first format and a second portion after the boundary using a second format, specifically designed to handle the orphaned symbol, allowing for sequence-based or DMRS-based transmissions without channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single format is used for all repetitions including orphaned symbols, then the transmission format is simple and consistent, but the orphaned symbol causes format mismatch leading to dropped data and transmission failures
Solution Approach 1:
The patent applies local quality by using different formatting approaches for different portions of the transmission. Specifically, repetitions before the slot boundary use one formatting method while the orphaned symbol after the boundary uses a different formatting method. This allows each portion to be optimized for its specific context, resolving the conflict between maintaining format consistency and handling the special case of orphaned symbols that would otherwise cause transmission failures.
2Productivity
If orphaned symbols are dropped or skipped to maintain format consistency, then the transmission format remains uniform, but resource wastage occurs and throughput decreases
Solution Approach 1:
The patent applies parameter changes by modifying the formatting parameters specifically for the orphaned symbol portion. Instead of dropping the orphaned symbol or applying the same format as full repetitions, the system changes the format parameters to accommodate the single symbol case. This resolves the contradiction by enabling the orphaned symbol to be transmitted usefully rather than being wasted, thereby improving throughput without requiring complex retransmission protocols.
3Loss of energy
If mixed format techniques are implemented to handle orphaned symbols, then resource usage efficiency improves and retransmissions are reduced, but the formatting and processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the repetition set into distinct portions: repetitions before the slot boundary and the orphaned symbol after the boundary. Each segment is formatted according to its specific requirements. This segmentation approach resolves the contradiction by allowing the system to handle each portion appropriately, improving resource efficiency by utilizing the orphaned symbol rather than wasting it, while keeping the complexity manageable through clear segmentation rules.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) receives, from a base station, an indication of a configuration for symbol repetition, the configuration including one or more parameters for transmitting a message on a physical uplink channel. The UE formats, based on a first format of the configuration, a first portion of a set of repetitions of the message scheduled for transmission before a slot boundary, and formats, based on a second format of the configuration, a second portion of the set of repetitions of the message scheduled for transmission after the slot boundary, the second portion being a single symbol. The UE transmits, to the base station, the first portion of the set of repetitions formatted according to the first format and the second portion of the set of repetitions according to the second format.