Multi-TRP Scheduling for Cyclic Prefix Delay Mismatch
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Solution Overview
Problem
Inter-cell multi-TRP operation in 3GPP networks faces challenges due to propagation delay differences between signals from different transmission reception points (TRPs) exceeding the cyclic prefix (CP), leading to overlapping symbols and issues with timing advance groups, UE capabilities, and cell scheduling.
Innovation Solution
Implementing methods for UE awareness, including control signaling with CORESETPoolIndex and physical cell ID association, cross-cell scheduling offset determination, and reporting of delay indicators to manage propagation delays and UE capabilities, along with separate antenna architectures for unsynchronized multi-TRP operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If intra-cell multi-TRP operation is implemented with synchronized timing, then signal coordination and scheduling simplicity are improved, but propagation delay differences exceeding cyclic prefix cannot be handled
Solution Approach 1:
The patent segments the multi-TRP operation into two distinct modes: synchronized mode for TRPs within the same cell and unsynchronized mode for TRPs across different cells. This segmentation allows each mode to be optimized independently, with the unsynchronized mode specifically designed to handle propagation delay differences exceeding the cyclic prefix by introducing separate timing advance groups and independent scheduling mechanisms.
Solution Approach 2:
The patent introduces dynamic timing adjustment mechanisms where the network can flexibly switch between synchronized and unsynchronized operation modes based on the specific deployment scenario and propagation conditions. The timing advance values and scheduling offsets are dynamically configured to accommodate varying propagation delays between TRPs, enabling the system to adapt to different network topologies and channel conditions.
2Adaptability or versatility
If unsynchronized multi-TRP operation is implemented to handle large propagation delays, then adaptability to different TRP configurations is improved, but symbol overlap and timing synchronization issues occur
Solution Approach 1:
The patent applies preliminary timing adjustment actions by configuring timing advance values and scheduling offsets before actual data transmission begins. The network calculates the propagation delay between the UE and each TRP in advance, and pre-configures the timing parameters to ensure that uplink signals from different TRPs arrive at the network side without overlapping, thereby preventing symbol collision before it occurs.
Solution Approach 2:
The patent introduces a network-side controller as an intermediary that coordinates the timing between multiple unsynchronized TRPs. This intermediary entity calculates the timing relationships between different TRPs and UEs, and configures appropriate timing advance groups and scheduling parameters to ensure that signals from different TRPs are properly separated in time, preventing symbol overlap while maintaining flexible TRP configurations.
3Measurement precision
If separate timing advance groups are configured for different TRPs, then propagation delay compensation is improved, but device complexity and scheduling overhead increase
Solution Approach 1:
The patent designs a universal timing management framework where a single set of timing advance group configurations can serve multiple TRPs with different propagation characteristics. The timing advance group structure is designed to be multi-functional, allowing the same mechanism to handle both intra-cell and inter-cell multi-TRP scenarios, as well as both synchronized and unsynchronized operation modes, thereby reducing overall system complexity while maintaining accurate delay compensation.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods to provide unsynchronized multi-transmission reception point operation in wireless communication systems.