PUSCH Repetition With Multiple Precoding for Uplink Reliability
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Solution Overview
Problem
Current physical uplink shared channel (PUSCH) transmission schemes face challenges in improving reliability, especially in ultra-reliable low-latency communication (URLLC) scenarios, and slot aggregation transmission schemes fail to ensure decoding performance due to changing channel conditions and terminal location changes, leading to deteriorated uplink performance, particularly at cell edges.
Innovation Solution
The method involves using multiple precoders for PUSCH transmission, indicated by network devices, allowing terminals to adapt to changing conditions and perform uplink transmission with different precoders, either within a single-station or multi-station scenario, enhancing decoding performance and reliability through diversity gains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slot aggregation transmission scheme is used to improve uplink coverage, then uplink coverage is improved, but a same precoder must be used in all slots which deteriorates decoding performance when channel conditions change
Solution Approach 1:
The patent applies dynamics by enabling the terminal to dynamically select different precoders for different slots in the slot aggregation transmission scheme. Instead of using a fixed same precoder across all aggregated slots, the terminal can adaptively change precoders based on varying channel conditions, thereby maintaining both uplink coverage improvement and decoding performance.
2Device complexity
If a same precoder is used in all aggregated slots, then transmission scheme simplicity is maintained, but decoding performance deteriorates when channel conditions change or terminal location changes
Solution Approach 1:
The patent applies parameter changes by allowing the precoder parameter to vary across different slots in the aggregation scheme. The terminal can select from multiple configured precoders based on current channel conditions, terminal location, or other criteria, thus improving decoding performance without significantly increasing system complexity.
3Reliability
If multiple precoders are used for PUSCH transmission, then uplink transmission reliability is improved, but indication information overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple precoders at the terminal before PUSCH transmission. The network device provides a set of candidate precoders in advance, and the terminal selects appropriate precoders from this pre-configured set based on channel conditions, thereby avoiding the need for extensive real-time indication information while maintaining multiple precoder benefits.
Data Source
AI summary
This disclosure provides a method for transmitting data on a physical uplink shared channel, a data transmission method, a terminal, a network device, and a chip system. A terminal receives indication information delivered by a plurality of network devices. The indication information is used to indicate a plurality of precoders (precoders). The terminal determines the plurality of precoders based on the indication information, and repeatedly sends a physical uplink shared channel PUSCH by using the plurality of precoders. Different precoders are used for at least two of the PUSCHs. In this disclosure, the PUSCH is repeatedly sent by using different precoders. This disclosure is applicable to 5G and future wireless networks.