Multi-Carrier Beam Indication Using Shared TCI State Updates
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Solution Overview
Problem
In wireless communication systems, particularly in millimeter wave communication, there is a challenge in aligning spatial beams between user equipment (UE) and gNodeB for efficient channel estimation and data communication, necessitating improved beam indication mechanisms for multiple component carriers (CCs).
Innovation Solution
The implementation of a unified transmission configuration indicator (TCI) state update for a subset of CCs, where beams are determined based on spatial quasi-co-location (QCL) properties for downlink and uplink channels, enabling efficient beam alignment and communication across multiple CCs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate beam indication mechanisms are used for each component carrier, then beam alignment accuracy for each CC is improved, but system complexity and signaling overhead increase
Solution Approach 1:
The patent combines beam indication for multiple component carriers into a unified TCI state update mechanism. A single TCI update message can configure beams for multiple CCs simultaneously, reducing signaling overhead and system complexity while maintaining beam alignment accuracy through shared spatial QCL properties across carriers
Solution Approach 2:
The TCI state update mechanism is designed to serve multiple component carriers universally. The same TCI configuration can be applied across different CCs, allowing a single beam indication structure to perform the function of multiple separate indications, thereby simplifying the system while preserving alignment precision
2Manufacturing precision
If individual TCI state updates are transmitted for each CC, then beam configuration accuracy is improved, but signaling overhead and transmission time increase
Solution Approach 1:
Multiple TCI state updates for different component carriers are merged into a single unified TCI update message. This consolidated approach maintains beam configuration accuracy by preserving individual CC associations while reducing signaling overhead and transmission time through batched configuration delivery
3Measurement precision
If beam alignment is performed separately for each CC, then channel estimation accuracy for each carrier is improved, but overall communication efficiency decreases
Solution Approach 1:
The beam alignment mechanism is designed to operate universally across multiple component carriers simultaneously. By establishing shared spatial QCL properties that apply across CCs, the system maintains channel estimation accuracy for each carrier while improving overall communication efficiency through coordinated multi-carrier beam operations
Data Source
AI summary
A method for operating a UE comprises receiving configuration information including a list of CCs and a set of TCI states; receiving, based on the configuration information, a TCI state update via a medium, wherein: the TCI state update is common for a first subset of CCs, the first subset of CCs includes n≤N CCs, and N=a number of CCs in the list of CCs; and for each CC(i) in the first subset of CCs, determining a beam based on the TCI state update, and applying the beam for a reception of a downlink control channel or a downlink data channel associated with the CC(i), wherein i is an index and takes a value from {1, 2, . . . , n}, wherein the beam is determined based on a spatial quasi-co-location property used to receive or transmit a source RS indicated via the TCI state update.