Antenna Port Subsets for SRS Precoding
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently utilizing multiple antenna ports for MIMO transmissions, leading to poor power amplifier utilization and potential performance loss due to unknown SRS-to-port mappings and power amplifier under-utilization, especially when the number of layers is less than the number of TXRUs.
Innovation Solution
A method where a wireless device explicitly or implicitly signals to a network node about compatible antenna port combinations for precoding, allowing the network node to determine optimal precoding hypotheses that avoid poor power utilization, thereby improving signal quality and power distribution across available TXRUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antenna ports are used for MIMO transmissions, then data rates and reliability are improved, but power amplifier utilization becomes inefficient and performance loss occurs
Solution Approach 1:
The patent segments the antenna ports into different groups or subsets, where each subset can be independently configured for MIMO transmissions. This segmentation allows the system to selectively activate only the necessary number of antenna ports matching the number of layers, thereby improving power amplifier utilization while maintaining high data rates through efficient use of available antennas.
2Reliability
If multiple antenna ports are used for MIMO transmissions, then reliability is improved, but power distribution across TXRUs becomes unbalanced
Solution Approach 1:
The patent applies local quality by configuring different power distribution strategies for different antenna port subsets. Each subset can have optimized power allocation tailored to its specific role in the MIMO transmission, ensuring that power is distributed efficiently across TXRUs while maintaining the overall reliability of the communication system through diversified antenna usage.
3Device complexity
If SRS-to-port mappings are not properly configured, then device complexity is reduced, but signal quality deteriorates due to unknown mappings
Solution Approach 1:
The patent implements preliminary action by pre-configuring SRS-to-port mappings and antenna port subset configurations before actual MIMO transmissions begin. This preliminary configuration ensures that the network node and wireless device have agreed-upon mappings in advance, eliminating the need for complex real-time determination while guaranteeing accurate signal quality measurement through properly configured reference signal transmissions.
Data Source
AI summary
Some embodiments include a method in a wireless device capable of uplink transmission in a wireless communication network. The wireless device comprises a plurality of antenna ports. The method comprises determining one or more subsets of the plurality of antenna ports. Each subset of antenna ports comprises antenna ports that can be coherently combined to form a precoding of a transmission layer for transmitting from the subset of antenna ports. The method further comprises communicating an indication of the one or more subsets to a network node, and receiving, from the network node, an instruction of a precoding to use for an uplink transmission. The instruction is based on the indicated one or more subsets. The method further comprises precoding an uplink transmission based on the received instruction, and transmitting the transmission to the network node.