Multi-DCI PUSCH Scheduling Across CORESET Pools for Reliable Uplink
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently supporting uplink directional communications to and from multiple transmission and reception points (TRPs) in 5G networks, particularly in improving reliability and reducing latency.
Innovation Solution
The solution involves configuring user equipment (UE) to distinguish between multiple TRPs based on control resource sets (CORESETs) with distinct CORESET pool indices, interpreting DCI messages to determine SRS resource sets, TCI states, and uplink power control parameters, enabling enhanced uplink communications with improved reliability and low latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-DCI messaging is used for uplink communications with multiple TRPs, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the uplink communication by introducing multiple DCI messages (first DCI and second DCI) from different TRPs, each carrying independent scheduling information for PUSCH transmissions. This segmentation allows the UE to establish separate uplink communication paths to different TRPs, thereby improving reliability through diversity while managing complexity through structured, modular processing of each DCI message independently
Solution Approach 2:
The patent adds a spatial dimension to uplink communications by enabling the UE to receive DCI messages from multiple TRPs located at different spatial positions. The UE determines different spatial relations based on different CORESETs, effectively utilizing the spatial dimension to improve reliability through multi-directional communication while the dimensionality change provides a systematic framework for managing the increased complexity
2Productivity
If multiple DCI messages are processed from multiple TRPs, then communication efficiency is improved, but processing time increases
Solution Approach 1:
The patent applies preliminary action by having the network pre-configure multiple CORESETs with different CORESET pool indices before uplink transmission. The UE is also pre-configured with multiple SRS resource sets corresponding to different spatial relations. When DCI messages are received, the UE can quickly match them to pre-configured parameters without extensive real-time processing, thereby improving communication efficiency while minimizing processing time
Solution Approach 2:
The patent uses copying by having the UE determine a second spatial relation that is identical to or copies the first spatial relation when the same SRS resource set is indicated by multiple DCI messages. This copying approach allows the UE to efficiently handle multiple DCI messages by reusing previously determined spatial parameters, improving processing efficiency while reducing the time required for repeated calculations
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. A communication device, otherwise known as a user equipment (UE) may receive, in a first control resource set (CORESET), a first downlink control information (DCI) message scheduling a first uplink shared channel, the first CORESET corresponding to a first CORESET pool index. The UE may receive, in a second CORESET, a second DCI message scheduling a second uplink shared channel, the second COREST corresponding to a second CORESET pool index different from the first CORESET pool index, where the second DCI message may be received before transmission of the first uplink shared channel. The UE may transmit both the first uplink shared channel and the second uplink shared channel based on the first uplink shared channel and the second uplink shared channel corresponding to a same hybrid automatic repeat request (HARQ) process.