Modulated Downlink Reference Signal for Low Power Wireless Operations
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Solution Overview
Problem
Wireless communication systems face challenges in reducing power consumption and latency when processing downlink reference signals, leading to excessive energy usage and inefficient operations in low power modes.
Innovation Solution
Modulating downlink reference signals with a set of bits including network temporary identifier bits and constellation bits, allowing user equipment (UE) to determine if a PDSCH transmission is intended, thereby enabling selective monitoring and reducing awake time, and adjusting ADC resolution based on the received constellation information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors downlink control channels to detect PDSCH transmissions, then the reliability of receiving downlink data is improved, but the power consumption increases and battery life decreases
Solution Approach 1:
The patent applies preliminary action by transmitting a downlink reference signal before the actual PDSCH data transmission. The reference signal contains constellation information that indicates whether a PDSCH transmission is scheduled. The UE processes this reference signal in advance to determine if it needs to wake up for full data reception, thereby avoiding unnecessary power consumption while ensuring reliable data reception when scheduled
Solution Approach 2:
The patent extracts the scheduling indication information from the downlink reference signal's constellation bits. Instead of requiring the UE to continuously decode full control channels, the essential scheduling information is extracted and embedded in the reference signal, allowing the UE to make quick decisions about whether to proceed with full data reception, thus reducing power consumption while maintaining reliability
2Measurement precision
If the UE processes downlink reference signals with high accuracy to determine scheduling information, then the measurement precision is improved, but the processing time increases and latency increases
Solution Approach 1:
The patent segments the downlink reference signal into distinct bit fields, including constellation bits that specifically indicate PDSCH scheduling information. This segmentation allows the UE to focus processing only on the relevant constellation bits to determine scheduling status, rather than processing the entire reference signal with full accuracy, thereby reducing processing time while maintaining sufficient precision for scheduling detection
Solution Approach 2:
The patent applies partial action by having the UE perform simplified processing on the downlink reference signal's constellation information. Instead of full-blown channel decoding and comprehensive signal processing, the UE only needs to detect the constellation bits indicating scheduling status. This partial processing achieves the necessary precision for scheduling detection while significantly reducing processing time and latency
3Adaptability or versatility
If the UE performs blind decoding of control channels to detect PDSCH transmissions, then the adaptability to different scheduling scenarios is improved, but the processing complexity increases and power consumption increases
Solution Approach 1:
The patent applies preliminary action by providing the UE with downlink reference signals that contain pre-encoded constellation information about PDSCH scheduling. This preliminary information allows the UE to adapt to different scheduling scenarios without performing complex blind decoding, as the scheduling intent is already indicated in the reference signal itself, thereby reducing processing complexity while maintaining adaptability
Solution Approach 2:
The patent introduces the downlink reference signal as an intermediary between the base station's scheduling decision and the UE's data reception. The reference signal's constellation bits serve as a mediator that conveys scheduling information in a simplified form, eliminating the need for the UE to perform complex blind decoding of control channels while still enabling adaptation to different scheduling scenarios through the encoded constellation information
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A communication device may receive control signaling indicating a downlink reference signal configuration, for example, a demodulation reference signal (DMRS) configuration. The communication device may receive a downlink reference signal (e.g., a DMRS) over a downlink control channel (e.g., a physical downlink control channel (PDCCH)) during an initial symbol duration of a transmission time interval (TTI). The downlink reference signal may include a set of bits including a first subset of bits including network temporary identifier bits and a second subset of bits including constellation bits associated with a downlink data channel (e.g., a physical downlink shared channel (PDSCH)). The communication device may process the downlink reference signal (e.g., a DMRS) based on the downlink reference signal configuration (e.g., a DMRS configuration).