Unified Sidelink TCI for Beam-Based Power Control
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing sidelink power control for reliable and low-latency communications, particularly when UEs are out of coverage or in complex topographies.
Innovation Solution
Implementing sidelink power control with unified Transmission Configuration Indicators (TCIs) that include sidelink pathloss reference signals and power control identifiers, allowing UEs to select and manage sidelink beams based on these indicators for improved power control parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sidelink power control methods are used, then system complexity is reduced, but communication reliability deteriorates when UEs are out of coverage
Solution Approach 1:
The patent introduces unified TCI as an intermediary mechanism that carries both beam indication and power control parameters. The TCI state acts as a mediator that links the gNB's scheduling decisions to the UE's transmit power control, providing a unified interface for both beam management and power control without requiring separate complex signaling mechanisms.
Solution Approach 2:
The unified TCI state serves multiple functions simultaneously: it indicates the sidelink beam direction, carries pathloss reference signal information for power control, and provides quasi-co-location information. This multi-functionality reduces the need for separate dedicated signaling mechanisms for beam management and power control, thereby improving reliability while managing complexity.
2Measurement precision
If unified TCI with multiple parameters is implemented, then power control precision is improved, but signaling overhead increases
Solution Approach 1:
The patent merges beam indication and power control parameter delivery into a single unified TCI state structure. Instead of transmitting separate beam indicators and separate power control parameters, both are combined within the TCI state, reducing signaling overhead while maintaining the precision of power control measurements through the included pathloss reference signal identifiers.
3Adaptability or versatility
If separate beam and power control mechanisms are used, then system adaptability is reduced, but implementation simplicity is maintained
Solution Approach 1:
The unified TCI state enables dynamic adaptation of power control parameters based on changing channel conditions and beam selections. The TCI state can be updated by the gNB to reflect current channel conditions, allowing the power control mechanism to adapt dynamically without requiring separate static configurations, thereby improving adaptability while the gNB manages the complexity centrally.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A first user equipment (UE) may select a sidelink beam for a second UE configured to be connected to the first UE based on a sidelink transmission configuration indicator (TCI). The sidelink TCI may include a sidelink pathloss reference signal identifier, or a sidelink power control identifier, or both. The first UE may transmit a sidelink pathloss reference signal to the second UE configured to be connected to the first UE. The sidelink pathloss reference signal may be associated with the sidelink pathloss reference signal identifier of the sidelink TCI.