Dynamic PUSCH Configuration via Pre-Configured TPMI-SRI Pairs
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Solution Overview
Problem
Current wireless communication technologies, such as LTE and NR, face challenges in efficiently configuring and updating transmit precoder matrix indicators (TPMI) and sounding reference signal (SRS) resource indicators (SRI) for physical uplink shared channels (PUSCH), leading to delays and suboptimal performance in PUSCH communications.
Innovation Solution
Implementing a method where user equipment (UE) receives a first signaling communication to configure multiple TPMI and SRI pairs from a base station (BS) and periodically cycles through these pairs to transmit PUSCH communications, allowing for dynamic configuration and reduction of signaling delays without additional updates from the BS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station frequently sends signaling updates to change TPMI and SRI configurations, then the PUSCH communication performance is improved, but the downlink radio resource usage increases and signaling delays occur
Solution Approach 1:
The base station pre-configures multiple TPMI and SRI pairs to the UE in advance through RRC signaling. The UE stores these pre-configured pairs and can switch between them using MAC CE commands or DCI indicators, eliminating the need for frequent RRC re-configurations and reducing signaling delay while maintaining adaptive PUSCH transmission capabilities
Solution Approach 2:
The configuration is divided into two layers: RRC layer for pre-configuring multiple TPMI-SRI pairs (static configuration) and MAC/PHY layer for dynamic selection among the pre-configured pairs (dynamic configuration). This segmentation allows performance optimization without frequent high-layer signaling updates
2Reliability
If the base station frequently sends signaling updates to change TPMI and SRI configurations, then the PUSCH communication performance is improved, but the downlink radio resource usage increases
Solution Approach 1:
Multiple TPMI and SRI pairs are pre-configured via RRC signaling in advance. Subsequent switches between these pairs are achieved through compact MAC CE commands or DCI field indicators, which consume significantly fewer downlink radio resources compared to frequent RRC re-configuration messages, thus reducing energy consumption while maintaining adaptive transmission
Solution Approach 2:
The system enables dynamic selection among pre-configured TPMI-SRI pairs using efficient MAC CE or DCI mechanisms, allowing the PUSCH transmission parameters to adapt to changing channel conditions without requiring frequent full re-configurations, thereby optimizing performance while minimizing downlink resource usage
3Device complexity
If the UE uses a single TPMI and SRI configuration, then the signaling overhead is reduced, but the adaptability to channel changes deteriorates
Solution Approach 1:
The configuration is segmented into RRC pre-configuration (multiple TPMI-SRI pairs) and MAC/PHY dynamic selection. This segmentation maintains low signaling overhead by avoiding frequent RRC updates while enabling adaptability through efficient MAC CE or DCI-based switching among the pre-configured pairs
Solution Approach 2:
The system provides dynamic adaptability by enabling the UE to switch between multiple pre-configured TPMI-SRI pairs using compact MAC CE commands or DCI indicators, allowing rapid response to channel changes without increasing RRC signaling overhead, thus maintaining low complexity while improving versatility
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station (BS), a first signaling communication that configures a plurality of transmit precoder matrix indicator (TPMI) and sounding reference signal (SRS) resource indicator (SRI) pairs. The plurality of TPMI and SRI pairs may be for transmitting respective physical uplink shared channel (PUSCH) communications to the BS. The UE may receive, from the BS, a second signaling communication that indicates an update to a TPMI and SRI pair of the plurality of TPMI and SRI pairs. The UE may transmit, to the BS, a PUSCH communication, of the respective PUSCH communications, based at least in part on the update to the TPMI and SRI pair. Numerous other aspects are provided.