Inter-Cell Beam Operation for Low-Latency Multi-TRP Mobility
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Solution Overview
Problem
Existing wireless communication systems face challenges in optimizing inter-cell beam management and mobility, particularly in multi-TRP operations, leading to increased latency and signaling overhead, especially in FR2 environments.
Innovation Solution
A method for inter-cell beam operation involving user equipment (UE) and network devices that includes receiving and applying RRC messages with TCI, RS, and CORESET pool index configurations to facilitate communication with cells having different physical cell identities, enabling efficient transmission and reception across multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional inter-cell beam management methods are used in multi-TRP operations, then basic communication functionality is maintained, but latency increases and signaling overhead increases
Solution Approach 1:
The patent merges TCI state configuration with spatial relation information into a unified configuration framework. The network device configures TCI states that inherently include spatial relation parameters, eliminating the need for separate spatial relation configuration signaling. This consolidation reduces signaling overhead while maintaining comprehensive beam management functionality across multiple TRPs.
Solution Approach 2:
The TCI state configuration is designed to serve multiple functions simultaneously: it provides beam indication, spatial relation information, and quasi-co-location parameters in a single unified structure. This multi-functional approach allows the same configuration mechanism to handle various beam management tasks across different cells and TRPs, reducing the need for multiple separate signaling procedures.
2Reliability
If separate TCI and spatial relation configurations are used for each cell, then comprehensive beam management is achieved, but signaling overhead increases
Solution Approach 1:
The patent combines TCI state parameters with spatial relation information into a single configuration message. Instead of transmitting separate TCI configurations and spatial relation configurations for each cell, the network device transmits a unified configuration that includes both elements, thereby maintaining comprehensive beam management while reducing signaling overhead.
Solution Approach 2:
The network device performs preliminary configuration of TCI states with embedded spatial relation information before actual beam management operations. This pre-configuration approach establishes the beam management framework in advance, allowing the UE to efficiently interpret subsequent beam indications without requiring repeated transmission of spatial relation parameters.
3Productivity
If multiple TRPs are used to enhance data rate and reliability, then capacity and coverage improve, but inter-cell mobility management becomes more complex
Solution Approach 1:
The unified TCI state configuration framework is designed to work across multiple TRPs and cells with a single consistent mechanism. The same TCI state structure and interpretation rules apply regardless of which TRP or cell is being referenced, enabling seamless inter-cell mobility management while supporting high data rates through multi-TRP operations.
Solution Approach 2:
The patent utilizes parameter changes within the unified TCI configuration to indicate different beam directions and spatial relations for different TRPs. By modifying parameters such as spatial relation indices and QCL parameters within the unified framework, the system can dynamically adapt to inter-cell mobility requirements without changing the overall configuration structure, thus reducing management complexity.
Data Source
AI summary
A method, a user equipment (UE), and a network device for an inter-cell beam operation are provided. The UE receives a radio resource control (RRC) message from a first cell and applies at least one of a transmission configuration indicator (TCI) configuration, a reference signal (RS) configuration associated with the TCI configuration, and a first value of control resource set (CORESET) pool indices to perform a transmission or a reception with a second cell. The RRC message includes first information including at least one of the TCI configuration, the RS configuration associated with the TCI configuration, and the first value of the CORESET pool indices. The first information is associated with the second cell having a second physical cell identity (PCI) that is different from a first PCI of the first cell.