Multi-Port Glue Reference Signals for MIMO Phase Coherence Estimation
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately estimating phase shifts and gain state changes across multiple transmission occasions and non-coherent ports, particularly in MIMO uplink communications, due to phase discontinuity and gain state changes, which are not effectively addressed by single-port reference signals.
Innovation Solution
Implementing a multi-port glue reference signal (gRS) configuration that includes a coherence report for pairs of ports, allowing UEs to transmit or receive signals via multiple ports, enabling network nodes to estimate phase shifts and gain state changes accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-port reference signals are used, then device complexity is reduced, but measurement precision of phase shifts and gain state changes deteriorates
Solution Approach 1:
The patent segments the reference signal configuration into multiple ports, where each port can be independently configured with its own reference signal. This allows the system to maintain simpler single-port configurations when needed while enabling multi-port configurations for enhanced measurement precision in MIMO scenarios, directly resolving the contradiction between device complexity and measurement precision.
Solution Approach 2:
The patent extends the reference signal concept from a single dimension (single port) to multiple dimensions (multiple ports), adding the port dimension to the reference signal configuration. This dimensional expansion enables simultaneous support for both simple single-port cases and complex multi-port MIMO cases, resolving the trade-off between complexity and precision.
2Measurement precision
If multi-port reference signal configuration is implemented, then measurement precision of phase shifts and gain state changes improves, but device complexity increases
Solution Approach 1:
The patent introduces dynamic configuration capabilities where the multi-port reference signal configuration can be adaptively enabled or disabled based on system conditions, UE capabilities, and MIMO operation requirements. This dynamic approach allows the system to achieve high measurement precision when needed while maintaining lower complexity in simpler scenarios, resolving the contradiction between precision and complexity.
Solution Approach 2:
The patent enables parameter changes in the reference signal configuration, allowing the number of ports, resource allocations, and signal characteristics to be dynamically adjusted. This flexibility permits the system to optimize between complexity and precision by changing configuration parameters according to actual operational needs, directly addressing the technical contradiction.
3Reliability
If coherence reporting for port pairs is added, then reliability of MIMO communication improves, but device complexity increases
Solution Approach 1:
The patent implements preliminary coherence reporting where UEs pre-report their coherence status for different port pairs before MIMO transmissions occur. This advance information allows the network to pre-configure appropriate reference signal settings and MIMO parameters, ensuring reliable communication while managing complexity through proactive rather than reactive configuration.
Solution Approach 2:
The patent establishes a feedback mechanism where UEs continuously report coherence status for port pairs, and the network uses this feedback to adaptively adjust reference signal configurations and MIMO parameters. This closed-loop feedback system improves reliability by ensuring configurations match actual channel conditions while managing complexity through intelligent, condition-based adjustments rather than exhaustive configuration options.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit a capability indication for a multi-port glue reference signal (gRS) configuration. The UE may receive the multi-port gRS configuration in response to the capability indication for the multi-port gRS configuration, wherein the capability indication for the multi-port gRS configuration includes a coherence report indicating coherence or non-coherence of one or more pairs of ports, and wherein the multi-port gRS configuration includes a configuration for transmitting or receiving a gRS via at least one of the one or more pairs of ports. Numerous other aspects are described.