Three-Port SRS Transmission via Codebook Precoding
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Solution Overview
Problem
Existing wireless communication systems are limited to specific quantities of sounding reference signal (SRS) ports, typically 1, 2, 4, or 8, which restricts the use of three antenna ports for uplink transmissions, potentially limiting communication performance and increasing costs associated with additional antenna ports.
Innovation Solution
The approach enables uplink sounding reference signal (SRS) transmission using three transmit antenna ports by reusing a four-port SRS resource or combining a two-port and a one-port SRS resource, allowing for devices to be implemented with three antennas or to provide three-layer multi-input and multiple-output (MIMO) transmissions without the additional expense of four antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If systems are limited to specific quantities of SRS ports (1, 2, 4, or 8), then system implementation is simpler and resource specification is standardized, but three antenna port transmissions are not supported which limits communication performance and increases costs
Solution Approach 1:
The patent enables SRS resources configured for standard port quantities (1, 2, 4, or 8 ports) to be reused for three antenna port transmissions by applying codebook-based precoding. This allows existing SRS resources to serve multiple functions including both standard and non-standard port configurations, achieving three-port support without requiring dedicated resources or increasing system complexity
Solution Approach 2:
The patent changes the precoding parameter by applying codebook-based precoding to SRS transmissions. By modifying the precoding matrix selection based on the number of transmit antennas, the system can adapt standard SRS resources to support three antenna ports. The codebook contains precoding matrices for different antenna configurations, allowing flexible adaptation to three-port scenarios
2Productivity
If four antennas are implemented to support three-layer MIMO, then communication performance improves, but additional cost and complexity are incurred
Solution Approach 1:
The patent extracts the essential function of three-layer MIMO transmission from the physical antenna structure by using codebook-based precoding with three transmit antennas. Instead of requiring four physical antennas to achieve three-layer MIMO, the system uses three antennas with appropriate precoding matrices from the codebook to create three independent spatial streams, thereby achieving the desired productivity with reduced quantity of physical antennas
Solution Approach 2:
The patent creates virtual antenna ports through codebook-based precoding, where the precoding matrices effectively copy or simulate the behavior of additional antenna elements. By selecting appropriate precoding matrices from the codebook, the system can create virtual spatial dimensions that mimic having more physical antennas, allowing three-layer MIMO performance with only three physical antennas
Data Source
AI summary
Some examples of the techniques described herein may facilitate transmissions using three antenna ports. For instance, some of the approaches described herein may enable uplink sounding (e.g., sounding reference signal (SRS)) transmission using three transmit antenna ports. In some examples, a four-port SRS resource may be reused for three-port SRS transmission. In some examples, a two-port SRS resource and a one-port SRS resource may be utilized for a three-port SRS transmission. Several aspects of SRS improvements may be provided to support uplink transmissions with three antenna ports. For instance, a coherent or non-coherent uplink codebook may be specified to facilitate three-antenna-port codebook-based transmissions. Some of the approaches may manage uplink transmission power or SRS resource signaling. For example, some of the techniques may provide SRS port to cyclic shift mapping or SRS power control.