Uplink Beam Selection Timeline for 5G Millimeter Wave Reliability
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Solution Overview
Problem
The challenge in 5G communication systems is to maintain reliable millimeter wave connections, which are sensitive to blockages due to the use of narrow beams and poor signal penetration at high frequencies. Additionally, there are open questions regarding the implementation of fast beam/panel selection for uplink transmission in terminal devices with antenna panels of varying capabilities.
Innovation Solution
The proposed solution involves an apparatus comprising a processor and memory configured to manage sounding reference signal (SRS) resource sets in terminal devices. This includes transmitting a first message with a capability value set index and resource indices, and updating the transmission configuration indication (TCI) state for the SRS resource set in response to a TCI state update message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If millimeter wave frequencies are used to improve throughput, then data transmission rate is improved, but connection reliability deteriorates due to sensitivity to blockages and poor penetration capability
Solution Approach 1:
The system dynamically switches between different beam pair links based on real-time radio environment conditions. Multiple beam pair links are configured and updated to adapt to terminal device movement and environmental changes, allowing the system to maintain reliable millimeter wave connections by transitioning to alternative beams when blockages occur
Solution Approach 2:
The system changes beam parameters including beam direction, beam width, and beam pair link configuration to optimize both throughput and reliability. By adjusting these parameters in response to detected blockages or environmental changes, the system maintains high data rates while improving connection stability
2Reliability
If multiple beam pair links are configured and updated to adapt to movement and environmental changes, then connection reliability is improved, but system complexity increases
Solution Approach 1:
The system implements feedback mechanisms where the terminal device reports radio environment conditions and beam quality metrics to the access node. Based on this feedback, the access node intelligently selects and updates appropriate beam pair links, reducing the complexity of manual configuration while maintaining high reliability
Solution Approach 2:
The terminal device autonomously performs beam measurements and reports preferred beam pair links to the access node. This self-service approach allows the system to maintain reliable connections through automatic beam adaptation without requiring complex centralized control for every beam adjustment
3Speed
If fast beam/panel selection is implemented for uplink transmission, then transmission speed is improved, but implementation complexity increases due to multiple antenna panels with different capabilities
Solution Approach 1:
The system pre-configures multiple antenna panels with different capabilities and pre-establishes multiple beam pair links for uplink transmission. This preliminary preparation allows the terminal device to quickly switch between panels and beams when needed, achieving fast beam/panel selection without complex real-time decision-making
Solution Approach 2:
The system designs antenna panels with universal interfaces and standardized capability descriptions, allowing different panels with varying numbers of antenna ports, beams, and power capabilities to be managed through a unified control mechanism. This multi-functionality approach simplifies the implementation of fast beam/panel selection across diverse hardware configurations
Data Source
AI summary
According to an aspect, there is provided an apparatus. The apparatus causes transmitting, by a terminal device, a first message comprising a capability value set index and a synchronization signal block resource index, SSBRI, or a channel state information reference signal resource index, CRI. The capability value set index is associated with a sounding reference signal, SRS, resource set. The apparatus causes the terminal device to receive a second message defining a transmission configuration indication, TCI, state comprising a quasi co-location, QCL, -TypeD reference signal corresponding to the SSBRI or CRI or being quasi co-located in terms of QCL-TypeD with a reference signal corresponding to the SSBRI or CRI. The apparatus causes the terminal device to active or indicate the TCI state. If the SRS resource set is different from an active SRS resource set, the apparatus applies a pre-defined latency time between application and expected triggering of the SRS resource set.