Uplink Precoder Selection via Sounding Reference Signals
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Solution Overview
Problem
Existing wireless communication networks face challenges in efficiently selecting precoders for uplink transmissions, as they require knowledge of the antenna arrangement of wireless devices, which restricts implementation flexibility and performance gain.
Innovation Solution
A method where a wireless device determines a subset of precoders and transmits sounding reference signals precoded with these precoders to a Radio Node, allowing the network to select the appropriate precoder without needing to know the device's antenna arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the network requires knowledge of the antenna arrangement for precoder selection, then precoder selection accuracy is improved, but implementation flexibility and device versatility deteriorate
Solution Approach 1:
The patent introduces a codebook as an intermediary between the wireless device and the network. The codebook contains predefined precoders that map antenna arrangements to specific precoding options. The wireless device selects precoders from the codebook based on its antenna arrangement without the network needing to know the specific arrangement details. This intermediary structure enables accurate precoder selection while maintaining implementation flexibility and supporting various antenna configurations.
2Reliability
If the network requires detailed information about antenna arrangement, then beamforming performance is improved, but device complexity and overhead increase
Solution Approach 1:
The patent extracts the antenna arrangement information requirement from the network side and relocates it to the device side. The wireless device autonomously selects precoders from the codebook based on its own antenna arrangement knowledge, without transmitting detailed arrangement information to the network. This extraction reduces network complexity and overhead while maintaining beamforming performance through accurate precoder selection.
3Productivity
If the network requires knowledge of antenna arrangement for precoder selection, then uplink transmission efficiency is improved, but information overhead increases
Solution Approach 1:
The patent uses a codebook that contains predefined precoder patterns as templates. Instead of transmitting detailed antenna arrangement information, the wireless device selects and indicates precoder indices from the codebook that best match its configuration. The network uses these indices to apply the corresponding precoders. This copying approach maintains uplink transmission efficiency while significantly reducing information overhead compared to transmitting complete antenna arrangement details.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances implementation flexibility and performance by allowing uplink beamforming without requiring the network to have detailed information about the device's antenna arrangement, reducing overhead and improving data transmission efficiency.
Implementation Method 1
Antenna beamforming is a technique of shaping the transmit radiated energy pattern or the receive sensed energy pattern into beams by the use of an antenna element array. These beams may be used to concentrate the transmitted signal energy and/or received signal energy and/or steer it in specific directions.
Data Source
AI summary
A wireless device and a method therein for assisting in precoder selection for wireless communication with a Radio Node (RN), and a RN for performing precoder selection for wireless communication with a wireless device. The wireless device is configured with a set of precoders. The wireless device determines a subset of precoders out of the set of precoders; and transmits, to the RN, at least one Sounding Reference Signal (SRS) precoded with a respective at least one precoder comprised in the subset. The RN receives, from the wireless device, at least one SRS precoded with a respective at least one precoder comprised in a subset of precoders; and transmits, to the wireless device, a signal indicative of a selected precoder to be used for a transmission to the RN, wherein the selected precoder is indirectly selected based on the received at least one SRS.