Multiplexed SRS Transmission via Antenna Port Segmentation
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Solution Overview
Problem
Current wireless communication systems, particularly those using New Radio (NR) technology, face challenges in efficiently transmitting multiplexed sounding reference signals (SRS) across multiple antenna ports, which is essential for accurate uplink channel quality measurement and frequency-dependent scheduling, due to limitations in existing NR designs that support only up to 4 antenna ports.
Innovation Solution
The method involves a user equipment (UE) obtaining an indication to transmit SRS via five or more antenna ports using techniques such as differing subcarrier combs, cyclic shifts, repetition factors, time division orthogonal cover codes, and frequency division orthogonal cover codes, allowing for multiplexing of SRS across various antenna ports within a single slot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing NR designs are used, then device complexity is reduced, but the number of supported antenna ports is limited to 4
Solution Approach 1:
The patent segments the transmission of SRS across multiple antenna ports by dividing them into groups (first group and second group). Each group is transmitted using different time resources (e.g., different slots or symbols), allowing the system to support more than 4 antenna ports by distributing them across segmented time intervals rather than requiring simultaneous transmission capacity.
Solution Approach 2:
The patent extends the antenna port capacity beyond the traditional 4-port limitation by introducing a time dimension. Instead of increasing spatial ports within a single time slot, the system multiplexes additional ports across multiple time slots or symbols, effectively adding a temporal dimension to port multiplexing and achieving support for 8 or more antenna ports.
2Measurement precision
If more than 4 antenna ports are supported, then uplink channel quality measurement accuracy is improved, but resource allocation complexity increases
Solution Approach 1:
The patent segments the channel quality measurement process by dividing antenna ports into groups that are measured in different time intervals. This segmentation allows the base station to process and allocate resources for each group separately, reducing the instantaneous resource allocation complexity while maintaining overall measurement accuracy across all ports.
Solution Approach 2:
The patent implements periodic transmission of SRS for different antenna port groups across multiple slots or symbols. This periodic action allows the base station to sequentially measure and allocate resources for each group in a structured manner, reducing the complexity of simultaneous resource allocation while ensuring comprehensive channel quality assessment for all ports.
3Productivity
If SRS is transmitted across multiple antenna ports in one slot, then transmission efficiency is improved, but signal interference increases
Solution Approach 1:
The patent segments the transmission of SRS across multiple antenna ports into different time slots or symbols, preventing simultaneous transmission from all ports. This temporal segmentation reduces signal interference between ports while maintaining transmission efficiency by systematically scheduling each port's transmission in dedicated time intervals.
Solution Approach 2:
The patent employs periodic transmission patterns where different antenna port groups are activated in alternating time slots or symbols. This periodic action allows the system to achieve comprehensive multi-port coverage while reducing interference by ensuring that not all ports transmit simultaneously, thereby balancing efficiency and interference management.
Data Source
AI summary
Certain aspects of the present disclosure relate to methods and apparatus for transmitting multiplexed sounding reference signal (SRS) ports in communications systems operating according to new radio (NR) technologies. An exemplary method includes obtaining an indication of a technique to use in transmitting sounding reference signals (SRS) via five or more antenna ports in one slot and transmitting the SRS via the five or more antenna ports according to the indicated technique.