NR Slot Aggregation Signaling for DMRS Precoder Continuity
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Solution Overview
Problem
There is a need for improved techniques in wireless communication systems, particularly in new radio (NR) systems, to enhance slot aggregation and demodulation reference signal handling to support efficient data transmission and reception in aggregated slots.
Innovation Solution
The method involves receiving radio resource control (RRC) signaling to configure a user equipment (UE) for semi-static or dynamic slot aggregation, determining DMRS precoder continuity, and demodulating transport blocks (TBs) based on this configuration, which includes configuring the UE to transmit or receive TBs in multiple aggregated slots using the same or different precoders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slot aggregation is implemented to transmit multiple transport blocks across aggregated slots, then data transmission reliability is improved, but system complexity increases due to additional signaling requirements for DMRS precoder continuity indication
Solution Approach 1:
The patent changes the signaling parameter from explicit multi-bit indication to implicit single-bit indication (precoder continuity indication). This parameter transformation reduces signaling overhead while maintaining the ability to convey precoder selection information across aggregated slots, thus improving reliability without proportionally increasing complexity
Solution Approach 2:
The patent establishes precoder selection rules in advance through higher-layer signaling (RRC configuration). By pre-defining the relationship between precoder continuity indication and actual precoder selection, the system avoids complex real-time signaling while ensuring reliable precoder management across aggregated slots
2Adaptability or versatility
If dynamic slot aggregation is configured to adapt to varying traffic conditions, then system adaptability is improved, but configuration complexity increases due to multiple configuration modes (semi-static and dynamic)
Solution Approach 1:
The patent implements a dual-mode configuration system where slot aggregation can be configured semi-statically or dynamically based on traffic conditions. The system dynamically selects between aggregation modes and precoder continuity indications, allowing adaptability to varying traffic requirements while managing configuration complexity through structured RRC signaling
Solution Approach 2:
The patent creates a universal configuration framework that handles both semi-static and dynamic slot aggregation through a unified RRC signaling mechanism. The same higher-layer signaling structure supports multiple aggregation modes and precoder selection strategies, reducing the need for separate configuration procedures and simplifying overall system complexity
3Measurement precision
If multiple DMRS precoders are used across aggregated slots, then demodulation performance is improved, but signal processing complexity increases
Solution Approach 1:
The patent applies different precoders to different local contexts (aggregated slots) based on channel conditions. By using precoder continuity indication to select appropriate precoders locally for each slot or TB, the system improves demodulation precision for specific transmissions without requiring complex global precoder management across all slots
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for slot aggregation in new radio (NR) systems. A method of wireless communication by a user equipment (UE) includes receiving radio resource control (RRC) signaling providing a semi-static configuration for transmission and/or reception of a repeated transport block (TB) and/or a different TB in each of a plurality of aggregated slots. The UE transmits or receives the TBs in the plurality of aggregated slots based on the semi-static configuration. Another method is provided in which the UE transmits and/or receives a demodulation reference signal (DMRS) in each of a plurality of aggregated slots, each DMRS associated with a repeated TB or a different TB in the slot. The UE determines, based on received signaling, whether the DMRS use a same precoder or a different precoder and modulates and/or demodulates the TBs in the plurality of aggregated slots based on the determination.