Uplink Waveform Configuration for 5G Base Stations
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Solution Overview
Problem
Current 5G NR base stations face challenges in identifying the uplink transmission waveform used by user equipment (UE) for DFT-S-OFDM and CP-OFDM, as existing LTE UEs only support DFT-S-OFDM, leading to difficulties in receiving uplink data without prior knowledge of the waveform.
Innovation Solution
Implementing a configuration unit in the base station to configure and transmit information about the transmission waveform to the UE using physical layer signaling, MAC RAR messages, and RRC signaling, allowing for the use of both DFT-S-OFDM and CP-OFDM waveforms, and enabling dynamic or predefined configuration based on resource allocation and RRC connected states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the base station supports both DFT-S-OFDM and CP-OFDM waveforms for uplink transmission, then the adaptability and versatility of the system is improved, but the device complexity increases due to the need to identify and handle multiple waveform types
Solution Approach 1:
The base station performs preliminary configuration of the uplink transmission waveform through RRC signaling before the actual uplink transmission occurs. This allows the UE to be pre-informed about which waveform (DFT-S-OFDM or CP-OFDM) to use, eliminating the need for the base station to complexly identify the waveform at reception time.
Solution Approach 2:
The waveform configuration is segmented into different signaling stages: RRC signaling for semi-static configuration and physical layer signaling (DCI) for dynamic indication. This segmentation allows each signaling layer to handle specific aspects of waveform configuration, reducing the overall complexity by dividing the problem into manageable parts.
2Reliability
If the base station uses RRC signaling to configure the transmission waveform, then the reliability of waveform configuration is improved, but the loss of time increases due to the semi-static nature of RRC signaling
Solution Approach 1:
The patent merges RRC signaling (for reliable semi-static configuration) with physical layer signaling via DCI (for rapid dynamic indication). The RRC signaling provides a reliable baseline configuration, while the DCI can quickly override or adjust the waveform selection based on current channel conditions, thus maintaining reliability while reducing time delay.
Solution Approach 2:
The system transitions from a purely static RRC configuration to a dynamic configuration mechanism where the DCI can indicate different waveforms based on real-time scheduling decisions. This allows the waveform to be dynamically adjusted without waiting for the next RRC reconfiguration, significantly reducing the time loss.
3Speed
If the base station uses physical layer signaling to indicate the transmission waveform, then the speed of waveform configuration is improved, but the loss of information increases due to the limited capacity of DCI fields
Solution Approach 1:
The patent extracts the waveform indication function from the main DCI payload and implements it through a dedicated field specifically designed for waveform selection. This extraction allows the waveform information to be clearly separated and efficiently encoded without interfering with other critical scheduling information, minimizing information loss.
Solution Approach 2:
The system applies local quality optimization by using a specifically designed DCI field for waveform indication, rather than trying to convey all configuration information through generic signaling. This localized approach ensures that the critical waveform selection information is transmitted with sufficient detail and accuracy.
Data Source
AI summary
Provided is a base station, comprising: a configuration unit, configured to configure a transmission waveform of a User Equipment (UE) for uplink transmission; and a transmission unit, configured to transmit information related to the configuration to the UE. The configuration unit is configured by using any of the following modes: physical layer signaling, a Random Access Response (RAR) message of Media Access Control (MAC), and Radio Resource Control (RRC) signaling. The present application also provides a user equipment (UE) and a corresponding method.