Uplink Panel Selection in Multi-TRP Systems Using Pathloss Mapping
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Solution Overview
Problem
Existing wireless communication systems with multiple transmission-reception points (TRPs) face challenges in efficiently selecting the optimal antenna panel for uplink transmission, leading to suboptimal performance and interference issues.
Innovation Solution
A method for panel selection in a multi-TRP system involves measuring reference signals and spatial relations to determine the best transmit beam and TRP, associating it with an antenna panel, and sending transmissions to the selected TRP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the WTRU uses a single antenna panel for PUCCH transmission in multi-TRP systems, then the device complexity is reduced, but the communication reliability deteriorates due to inability to select optimal panels for different TRPs
Solution Approach 1:
The WTRU autonomously performs panel selection by measuring pathloss for each TRP using spatial relation information and comparing measurements to determine the best panel, without requiring network control or additional signaling for panel selection decisions
Solution Approach 2:
The WTRU changes the selection criterion from simple signal strength to pathloss measurement based on spatial relation information between transmit beams and reference signals, allowing optimal panel selection for each TRP's characteristics
2Reliability
If the WTRU measures pathloss for multiple TRPs using spatial relation information, then the transmission quality is improved, but the measurement and processing time increases
Solution Approach 1:
The network pre-configures spatial relation information associating transmit beams with reference signals for multiple TRPs before uplink transmission, allowing the WTRU to perform measurements on already-identified candidate panels rather than searching all possible panels
Solution Approach 2:
The spatial relation information structure serves multiple purposes: it identifies candidate panels, provides reference signals for pathloss measurement, and establishes the mapping between TRPs and measurement criteria, eliminating the need for separate configuration procedures
3Object-affected harmful factors
If the WTRU selects different antenna panels for different TRPs, then the interference management is improved, but the device complexity increases due to multiple panel configurations
Solution Approach 1:
The WTRU applies different antenna panels locally to different TRPs based on their specific spatial characteristics and pathloss measurements, optimizing the transmission for each TRP's local environment rather than using a uniform panel configuration
Solution Approach 2:
The panel selection is dynamic and adaptive, allowing the WTRU to change which panel is used for each TRP based on current channel conditions and pathloss measurements, rather than being fixed to specific panel-TRP mappings
Data Source
AI summary
Apparatuses and methods are disclosed for panel selection for uplink (UL) transmission in a multi-transmission-reception point (TRP) system. A method performed by a wireless transmit/receive unit (WTRU) may include receiving, for each of a plurality of transmit/receive points (TRPs), information for measuring a first set of reference signals and spatial relation information, the spatial relation information associating each of one or more transmit beams with one or more of a second set of reference signals and with physical uplink control channel (PUCCH) resources. The method may include, for each of the plurality of TRPs, measuring a pathloss of each common reference signal among the first and second set of reference signals. The method may include selecting a transmit beam and a TRP and sending a transmission to the selected TRP. The transmit beam may be associated with an antenna panel of the WTRU.