FR1 PUCCH UCI Power Control Without Multi-TRP Beam Signaling
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting uplink control information (UCI) on physical uplink control channels (PUCCH) without defining or indicating beam information, particularly in frequency range 1 (FR1), leading to inefficiencies in power consumption and latency.
Innovation Solution
Configuring user equipment (UE) to use separate sets of uplink power control parameters for UCI transmission to multiple transmission-reception points (TRPs) in FR1, without requiring beam information, by signaling power information separately from beam information through mechanisms like MAC-CE or RRC messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam information is indicated for UCI transmission to multiple TRPs, then transmission reliability is improved, but signaling overhead and device complexity increase
Solution Approach 1:
The patent segments the spatial relation information into two independent parts: beam information and power control parameters. By configuring separate power control parameter sets for different TRPs without requiring separate beam information indications, the patent reduces signaling overhead while maintaining the ability to transmit to multiple TRPs reliably. The UE uses the same beam (spatial filter) but applies different power control parameters for different target TRPs.
Solution Approach 2:
The patent extracts the power control parameters from the bundled spatial relation information configuration. Instead of indicating complete beam information for each TRP, the network extracts and separately configures only the power control parameters (P0, alpha, pathloss reference) that are needed for multi-TRP transmission, leaving beam management simplified.
2Use of energy by moving object
If separate power control parameters are configured for multiple TRPs, then power efficiency is improved, but configuration complexity increases
Solution Approach 1:
The patent segments power control configuration into separate parameter sets (first set for first TRP, second set for second TRP) that can be independently configured and activated. Each set contains P0, alpha, and pathloss reference parameters, allowing the UE to select appropriate parameters based on the target TRP without managing complex beam information.
Solution Approach 2:
The patent creates a universal power control parameter configuration framework that works for both single-TRP and multi-TRP scenarios. The same parameter set structure and selection mechanisms (MAC-CE activation, RRC configuration) are used regardless of whether transmitting to one or multiple TRPs, simplifying implementation.
3Loss of information
If beam information is not indicated for FR1 transmissions, then signaling overhead is reduced, but transmission precision may be affected
Solution Approach 1:
The patent applies local quality by treating FR1 and FR2 differently. For FR1 (sub-6 GHz), the patent configures only power control parameters without beam information since FR1 signals propagate differently and don't require precise beamforming. For FR2 (mmWave), complete spatial relation information including beam parameters is configured. This localized approach optimizes signaling overhead for each frequency range's characteristics.
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive a message scheduling transmission, by the UE, of uplink control information (UCI) in a physical uplink control channel (PUCCH) resource. The UE may receive an indication that the UE is scheduled to transmit the UCI in the PUCCH resource to both a first transmission-reception point (TRP) and a second TRP. The UE may also receive a first set of uplink power control parameters for transmitting the UCI to the first TRP and a second set of uplink power control parameters for transmitting the UCI to the second TRP. The UE may transmit the UCI to the first TRP and to the second TRP in the PUCCH resource, based on the first set and the second set of uplink power control parameters, and without an uplink control channel beam indication.