PUSCH Precoder Indication for Uplink Reliability and Power Efficiency
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Solution Overview
Problem
Current wireless communication technologies face challenges in efficiently managing resource and power consumption during Physical Uplink Shared Channel (PUSCH) communications between user equipment (UE) and base stations, particularly in coordinating multiple precoders for repetitive transmissions.
Innovation Solution
The implementation of codebook-based and non-codebook-based precoding schemes, where the base station provides indicators for transmission precoder matrices and ranks, allowing the UE to configure and apply multiple precoders for PUSCH transmissions, thereby optimizing resource allocation and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PUSCH repetitions are transmitted to improve reliability, then communication reliability is improved, but resource consumption and power consumption increase
Solution Approach 1:
The patent implements dynamic precoder selection where the UE determines multiple precoders based on SRS resources and receives indicators from the base station to select appropriate precoders for different PUSCH repetitions. This dynamic adaptation allows the system to optimize power consumption by selecting precoders that maintain reliability while reducing unnecessary power expenditure on redundant transmissions with identical precoding.
Solution Approach 2:
The patent changes the precoding parameters across different PUSCH repetitions by determining multiple precoders from a codebook based on SRS resource indicators. By varying the precoding parameters (different precoder indices, different SRS resources) across repetitions, the system improves reliability through diversity while the base station can control the number and type of precoders to manage power consumption.
2Reliability
If multiple precoders are used for PUSCH repetitions to improve reliability, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent introduces SRS (Sounding Reference Signal) resources as an intermediary mechanism to manage precoder selection. The UE determines multiple precoders based on SRS resources, and the base station provides indicators (SRI, TPMI, TRI) that reference these pre-determined precoders. This intermediary structure simplifies the complexity by providing a standardized framework for precoder management rather than requiring direct complex coordination for each precoder selection.
Solution Approach 2:
The patent implements preliminary determination of precoders before actual PUSCH transmission. The UE determines multiple precoders in advance based on SRS resources and codebook configurations, and the base station provides indicators that select from these pre-determined precoders. This preliminary action reduces the complexity during actual transmission by having the precoder selection work already completed or pre-configured.
3Productivity
If codebook-based precoding is implemented to optimize resource allocation, then resource efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent merges multiple pieces of precoding information into a unified codebook structure. Instead of separately signaling individual precoder parameters, the system uses a codebook where precoders are pre-defined and indexed. The base station signals compact indices (TPMI, TRI) that reference combinations of precoding parameters, thereby reducing signaling overhead while maintaining the ability to optimize resource allocation through codebook-based precoding.
Data Source
AI summary
Approaches for performing Physical Uplink Shared Channel (PUSCH) transmissions include receiving, by a user equipment (UE) from a base station, an indicator of a plurality of precoders corresponding to M Physical Uplink Shared Channel (PUSCH) repetitions, wherein M is an integer. A plurality of precoders corresponding to two or more of the M PUSCH repetitions are indicated. The UE configures the plurality of precoders based on the indicator and transmits one or more of the M Physical Uplink Shared Channel (PUSCH) repetitions corresponding to one or more of the plurality of precoders. The indicator can be provided in higher layer signaling. One or more transmission rank indicator (TRIs) and transmission precoder matrix indicators (TPMIs) for the M PUSCH repetitions can be provided. The indicator can be provided in a scheduling downlink control indicator (DCI) communication. The indicator can also be provided within N sounding reference signal (SRS) resource indicator(s) (SRIs) of the scheduling DCI.