Uplink Reference Signal Reconfiguration for Insertion Loss Mitigation
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Solution Overview
Problem
Existing 5G NR systems face performance degradation due to insertion loss when uplink reference signals are transmitted through multiple antennas, leading to inaccurate channel estimation and reduced throughput, as current solutions do not account for dynamic path loss and power differences among antennas.
Innovation Solution
A framework for uplink reference signal transmission that allows user equipment to request a re-configuration based on available power headroom, adjusting the resource blocks to mitigate insertion loss by selecting a configuration that compensates for power differences among antennas, thereby improving channel sounding and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If uplink reference signals are transmitted through multiple antennas to improve channel estimation, then channel estimation accuracy is improved, but insertion loss increases causing power differences among antennas
Solution Approach 1:
The patent applies parameter changes by adjusting the transmission power of reference signals based on antenna-specific insertion loss characteristics. The network determines compensation values for each antenna port and configures the UE to transmit reference signals with adjusted power levels, thereby compensating for insertion loss differences while maintaining accurate channel estimation across all antennas.
2Adaptability or versatility
If reference signal transmission is switched among multiple antennas to cover all antennas, then channel sounding coverage is improved, but power headroom is reduced due to higher insertion loss
Solution Approach 1:
The patent implements dynamics by enabling dynamic adjustment of reference signal transmission power based on real-time insertion loss measurements and network conditions. The network can dynamically determine compensation values and configure power levels for each antenna port, allowing the system to adapt to varying insertion loss conditions while maintaining adequate power headroom for data transmission.
3Measurement precision
If insertion loss compensation is applied to all antennas, then channel estimation accuracy is improved, but system complexity increases due to per-antenna power adjustment
Solution Approach 1:
The patent applies preliminary action by having the network pre-determine and configure insertion loss compensation values before reference signal transmission. The network calculates appropriate power compensation based on antenna characteristics and configures the UE accordingly in advance, simplifying the transmission process while maintaining accurate channel estimation without requiring complex real-time adjustments.
Data Source
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AI summary
Disclosed is inter alia a user equipment, comprising means for: - receiving, from a network node, a first configuration for at least one uplink reference signal to be transmitted through at least one respective antenna port of the user equipment, wherein the first configuration comprises a first set of resource blocks over which the at least one uplink reference signal is to be transmitted; - determining whether sufficient power headroom is available at the user equipment to compensate for at least one first insertion loss to be incurred within the user equipment by the at least one respective uplink reference signal transmitted according to the first configuration; - if it is determined that sufficient power headroom to compensate for the at least one first insertion loss is not available, transmitting, to the network node, a re-configuration request for the at least one uplink reference signal; - receiving, from the network node in response to the re-configuration request, a second configuration for the at least one uplink reference signal associated with a second set of resource blocks over which the at least one uplink reference signal is to be transmitted; and - transmitting, to the network node, the at least one uplink reference signal according to the second configuration through the at least one respective antenna port.