SFN PDCCH TCI State Determination Without Activation Commands
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in single frequency network (SFN) environments, user equipment (UE) faces challenges in determining transmission configuration indicator (TCI) states for monitoring SFN physical downlink control channels (PDCCH) without receiving activation commands, leading to reduced reliability and increased latency due to missed PDCCH receptions and repeated random access procedure attempts.
Innovation Solution
The UE determines TCI states for monitoring SFN PDCCH based on the absence of activation commands, using either a single TCI state associated with an initial access procedure or multiple TCI states indicated in the CORESET configuration, allowing it to receive PDCCH communications and initiate random access procedures effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for activation commands to determine TCI states for SFN PDCCH monitoring, then the system follows standard activation procedures, but PDCCH reception reliability deteriorates and latency increases due to missed receptions and repeated random access attempts
Solution Approach 1:
The UE performs preliminary TCI state determination by selecting TCI states from the CORESET configuration before receiving activation commands. This preliminary action allows the UE to immediately monitor SFN PDCCH using predetermined TCI states, avoiding delays caused by waiting for activation commands and preventing missed PDCCH receptions.
2Productivity
If the UE determines TCI states without activation commands, then latency is reduced and reliability improves, but the device complexity increases due to autonomous TCI state selection logic
Solution Approach 1:
The UE performs self-service by autonomously determining its own TCI states for SFN PDCCH monitoring based on CORESET configuration information. The UE selects TCI states from the configured set without requiring network activation commands, enabling independent and rapid random access procedure initiation while maintaining controlled complexity through standardized selection rules.
3Reliability
If the UE monitors SFN PDCCH with multiple TCI states, then reception reliability improves through diversity, but energy consumption increases due to enhanced monitoring requirements
Solution Approach 1:
The UE applies partial action by monitoring SFN PDCCH with a selected subset of TCI states from the configured set rather than all possible states. The UE determines one or more TCI states based on CORESET configuration and monitors using these determined states, providing sufficient diversity for reliable reception while limiting the number of monitoring operations to control power consumption.
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, a configuration of a control resource set (CORESET), wherein the configuration includes an indication that the CORESET is a single frequency network (SFN) CORESET. The UE may determine one or more transmission configuration indicator (TCI) states for monitoring the SFN CORESET based at least in part on a determination that the UE has not received an activation command that indicates multiple TCI states to be activated. The UE may receive a physical downlink control channel (PDCCH) communication using the one or more TCI states determined for monitoring the SFN CORESET. Numerous other aspects are described.