Multi-TRP DCI Scheduling for Reliable Same-HARQ Uplink Channels
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing uplink communications with multiple transmission and reception points (TRPs) for improved reliability and reduced latency, particularly in 5G systems.
Innovation Solution
The system configures user equipment (UE) to receive downlink control information (DCI) messages from multiple TRPs, using CORESET pool indices to distinguish between TRPs and interpret fields for uplink transmissions, including SRS resource sets, TCI states, and power control parameters, enabling simultaneous transmission of uplink channels based on multiple DCI messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system uses multiple DCI messages from multiple TRPs for uplink scheduling, then reliability and coverage are improved, but device complexity and processing overhead increase
Solution Approach 1:
The patent segments the uplink scheduling control by introducing multiple DCI messages from different TRPs, each carrying independent scheduling information. This segmentation allows the UE to receive redundant scheduling commands from multiple sources, improving reliability through diversity while distributing the processing load across separate control channels rather than consolidating all control functions in one place.
Solution Approach 2:
The patent implements preliminary action by configuring the UE with multiple CORESETs and associated DCI monitoring before actual uplink transmission is needed. The UE is pre-configured with multiple control resource sets, search spaces, and DCI formats from different TRPs, so that when uplink scheduling is required, the UE can immediately process the appropriate DCI message without additional configuration delays, thus improving reliability while managing complexity through advance setup.
2Reliability
If the system implements multi-DCI message processing with multiple CORESETs, then uplink transmission reliability improves, but control region complexity increases
Solution Approach 1:
The control region is segmented into multiple CORESETs, each associated with a specific TRP and configured with its own search space and DCI monitoring parameters. This segmentation allows independent configuration and management of control resources from different TRPs, improving uplink transmission reliability through spatial diversity while organizing control region complexity into manageable, TRP-specific units rather than a monolithic control structure.
Solution Approach 2:
Instead of having a single centralized control region managing all uplink scheduling, the patent inverts the approach by distributing control functions across multiple TRP-specific CORESETs. Each TRP maintains its own control region with independent DCI messaging, flipping the traditional centralized control model into a distributed control architecture that improves reliability through redundancy while making control region complexity more manageable through modular organization.
3Loss of time
If the system uses multiple TRPs for simultaneous uplink scheduling, then latency is reduced, but power consumption increases
Solution Approach 1:
The patent applies partial action by enabling the UE to monitor and process only the necessary subset of DCI messages from multiple TRPs based on current transmission needs. Rather than continuously processing all possible DCI messages from all TRPs, the UE selectively processes DCI messages relevant to active uplink scheduling opportunities, reducing power consumption while still achieving low latency through parallel processing of multiple relevant scheduling commands when needed.
Data Source
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 CORSET 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 (HARM) process.