Beam Management for Carrier Aggregation via TCI Configuration
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Solution Overview
Problem
In 5G wireless systems, User Equipment (UE) devices face challenges in receiving physical downlink control channels (PDCCH) and physical downlink shared channels (PDSCH) with different beams simultaneously due to collisions and non-colocated antenna ports, leading to limitations in multi-band and multi-carrier operations.
Innovation Solution
The UE is configured to decode transmission configuration indicators (TCI) for all bandwidth parts (BWPs) or component carriers (CCs), identify scheduling restrictions, and apply priority rules for processing control and data channels based on reception types, enabling quasi-co-location and efficient beam management across multiple BWPs/CCs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE receives PDCCH and PDSCH with different beams simultaneously, then multi-band and multi-carrier operations are enabled, but collisions and non-colocated antenna ports cause reception failures
Solution Approach 1:
The network configures TCI states in advance for both control and data channels, indicating spatial QCL relationships before transmission occurs. This preliminary configuration allows the UE to prepare appropriate receiving beams ahead of time, avoiding conflicts during simultaneous reception of PDCCH and PDSCH with different beams.
Solution Approach 2:
The TCI state configuration acts as an intermediary mechanism that mediates between the network's transmission intentions and the UE's reception capabilities. By configuring spatial QCL relationships through TCI states, the network provides guidance that resolves the conflict between using different beams for control and data channels while maintaining reliable reception.
2Device complexity
If a single beam is used for all BWPs/CCs, then beam management is simplified, but simultaneous reception of multiple physical channels with different spatial requirements is limited
Solution Approach 1:
The patent segments beam management by configuring separate TCI states for different BWPs and CCs. Each BWP/CC can have its own TCI state configuration, allowing independent spatial QCL relationships to be established. This segmentation enables simultaneous reception of multiple channels with different spatial requirements while keeping the management mechanism organized and tractable.
Solution Approach 2:
The TCI state configuration mechanism serves multiple functions: it manages beams for control channels, data channels, and reference signals across multiple BWPs and CCs. This universal mechanism handles diverse spatial requirements through a unified configuration approach, enabling simultaneous reception capabilities without requiring separate management systems for each channel type.
3Reliability
If different beams are configured for control and data channels, then spatial diversity is improved, but scheduling conflicts and resource allocation complexity increase
Solution Approach 1:
TCI states are configured in advance to establish spatial QCL relationships between control and data channels. This preliminary configuration of beam spatial parameters allows the scheduler to allocate resources without dealing with complex real-time beam coordination, as the spatial relationships are predetermined through TCI state configurations.
Solution Approach 2:
The patent changes the parameter management approach by introducing TCI states that encode spatial QCL relationships. Instead of managing complex beam parameters directly during scheduling, the system uses TCI state parameters to define spatial relationships, simplifying the scheduling process while maintaining spatial diversity benefits.
Data Source
AI summary
Technology for a user equipment (UE) operable for beam management is disclosed. The UE can be configured to decode, at the UE, a transmission configuration indicator (TCI), wherein the TCI is configured for a control channel and a data channel for all bandwidth parts (BWPs) of the UE or all component carriers (CCs) of the UE. The UE can be configured to decode, at the UE, a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS) for beam management with a repetition parameter set to “ON” transmitted in one BWP or one CC in a first set of symbols. The UE can be configured to identify, at the UE, a scheduling restriction for the first set of symbols for the control channel and the data channel, wherein the scheduling restriction indicates that downlink transmission in the first set of symbols is not expected.