Multi-TRP PDCCH Resource Mapping for Enhanced Capacity
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face limitations in PDCCH capacity and robustness due to the reliance on single TRP transmissions, which are insufficient for high aggregation level UEs and URLLC scenarios.
Innovation Solution
The proposed solution involves apparatus and methods for resource mapping that enable enhanced PDCCH transmission using multiple beams from multiple TRPs, allowing for the determination of transmission resources and resource candidates that include multiple sets of Resource Elements (REs) for transmission by different TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single TRP transmission is used for PDCCH, then device complexity is reduced, but PDCCH capacity and robustness deteriorate
Solution Approach 1:
The PDCCH transmission is segmented across multiple TRPs, where each TRP transmits a portion of the control channel using separate beams. The UE receives and combines signals from multiple TRPs (e.g., TRP1 and TRP2), achieving diversity gain and improved robustness without requiring a completely new transmission architecture
Solution Approach 2:
Multiple PDCCH transmissions from different TRPs are merged at the UE side through signal combining techniques. The UE processes received signals from multiple TRPs and combines them to decode the control information, thereby improving reliability while maintaining compatibility with existing single-TRP operational modes
2Productivity
If single TRP transmission is used for PDCCH, then resource allocation is simplified, but PDCCH capacity is limited
Solution Approach 1:
The resource allocation extends from a single TRP dimension to multiple TRP dimensions. Different TRPs are assigned different resource sets (e.g., first resource group for TRP1, second resource group for TRP2), creating a multi-dimensional resource space that increases overall PDCCH capacity while maintaining structured allocation patterns
Solution Approach 2:
The resource mapping mechanism serves multiple functions: it supports both single-TRP and multi-TRP transmission modes, maintains backward compatibility with existing PDCCH structures, and enables flexible resource allocation across different aggregation levels and UEs through a unified framework
3Reliability
If multiple beams from multiple TRPs are used for PDCCH transmission, then coverage and robustness are improved, but signal coordination becomes more difficult
Solution Approach 1:
The network side (gNB) acts as an intermediary that coordinates the transmission resources and beam configurations for multiple TRPs. Resource sets, TCI states, and other parameters are centrally managed and signaled to UEs, simplifying the coordination complexity by providing a unified control mechanism rather than requiring direct TRP-to-TRP coordination
Data Source
AI summary
Apparatus and methods of resource mapping for enhanced PDCCH transmission with multiple beams from multiple TRPs are disclosed. The apparatus includes: a processor that determines transmission resources capable of transmitting Physical Downlink Control Channel (PDCCH) using a Control Resource Set (CORESET) by a plurality of wireless transmitting-receiving identities including a first identity and a second identity; and determines a resource candidate from the transmission resources for transmitting the PDCCH; where the resource candidate includes a first resource group having a first set of Resource Elements (REs) for transmission by the first identity, and a second resource group having a second set of REs for transmission by the second identity; and a transmitter that transmits the PDCCH using the resource candidate.