PDSCH Repetition Mapping in One Slot for Reliable DMRS Placement

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing PDSCH mapping types for PDSCH repetition within a single slot, particularly in multi-transmission reception point scenarios, which affect high reliability and low latency communications.

Innovation Solution

A method for determining PDSCH mapping types for PDSCH repetition in one slot, where a UE receives DCI communication scheduling multiple transmission occasions and determines mapping types based on indicated TCI states and assumed mapping types, ensuring proper DMRS symbol placement for accurate reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If PDSCH repetition is scheduled within a single slot using DCI, then latency is reduced and throughput is improved, but mapping type determination becomes ambiguous and unreliable

Engineering Contradiction:

ImprovelatencyVSAvoidmapping type determination reliability

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The patent applies preliminary action by pre-configuring mapping type determination rules through higher layer signaling (RRC configuration) before the actual PDSCH transmission occurs. The UE is provided with configuredMappingTypeA and configuredMappingTypeB parameters that define the mapping types for first and second transmission occasions, respectively. This pre-configuration ensures that when DCI schedules PDSCH repetition within a single slot, the UE can reliably determine the mapping types without ambiguity, thus resolving the reliability issue while maintaining the low latency benefit.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If mapping type A is used for first transmission occasion and mapping type B for second, then DMRS placement is optimized, but complexity increases in determining which mapping type to use

Engineering Contradiction:

ImproveDMRS placement accuracyVSAvoidmapping type determination complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent implements feedback through DCI format 1_1 or 1_2 which contains a time domain resource assignment field that indicates the mapping type for each transmission occasion. The DCI provides feedback information that tells the UE which pre-configured mapping type to apply for the first and second transmission occasions. This feedback mechanism simplifies the UE's determination process by providing explicit indicators rather than requiring complex analysis of multiple parameters, thus reducing device complexity while maintaining accurate DMRS placement.

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP4091287B1Physical downlink shared channel mapping type for physical downlink shared channel repetition in one slot

Publication Date: 2026.02.18 QUALCOMM INC

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AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive a downlink control information (DCI) communication that schedules a physical downlink shared channel (PDSCH) including a first transmission occasion and a second transmission occasion; and determine a mapping type for the first transmission occasion and a mapping type for the second transmission occasion based at least in part on receiving the DCI communication scheduling the PDSCH including the first transmission occasion and the second transmission occasion. Numerous other aspects are provided.