On-Demand NES Cell Synchronization Signaling With Wake-Up Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing network energy consumption, particularly in establishing communications with network energy savings (NES) cells due to incomplete synchronization information provided by downlink reference signals.
Innovation Solution
A user equipment (UE) receives assistance information from an anchor cell to establish communications with a NES cell, transmits a wake-up signal (WUS) indicating initial timing information, and receives subsequent timing information from the NES cell, enabling efficient synchronization signaling for network energy savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If downlink reference signals are used to provide synchronization information for NES cells, then network energy savings can be achieved, but the synchronization information is incomplete and cannot fully establish communications
Solution Approach 1:
The synchronization information is segmented into two parts: downlink reference signals provide initial synchronization, while additional uplink signals (wake-up signals and timing adjustment signals) provide complementary synchronization information. This segmentation allows the network to save energy by using lighter downlink signals while maintaining complete synchronization through the uplink feedback mechanism.
Solution Approach 2:
The patent implements a feedback mechanism where the UE transmits wake-up signals and timing adjustment signals back to the network entity based on the downlink reference signals. This feedback loop enables the network to obtain complete synchronization information that would otherwise be lost, resolving the contradiction between energy savings and information completeness.
2Reliability
If complete synchronization information is provided for NES cells, then communication establishment is reliable, but network energy consumption increases
Solution Approach 1:
The synchronization process is segmented into initial downlink reference signals and subsequent uplink confirmation signals. This allows the network to provide reliable synchronization information only when needed, rather than continuously transmitting complete synchronization data, thus reducing overall energy consumption while maintaining communication reliability.
Solution Approach 2:
The synchronization mechanism is made dynamic by using conditional uplink signals that are transmitted only after receiving downlink reference signals. This dynamic approach allows the network to adapt its synchronization behavior based on actual communication needs, providing reliability when required while minimizing energy consumption during idle periods.
3Loss of information
If downlink reference signals transmit all synchronization parameters, then synchronization is complete, but signal complexity and overhead increase
Solution Approach 1:
The synchronization parameters are segmented across multiple signal types: downlink reference signals carry initial parameters, while uplink wake-up signals and timing adjustment signals carry additional parameters. This segmentation reduces the complexity of individual downlink signals while ensuring parameter completeness through the distributed signal structure.
Solution Approach 2:
The downlink reference signals transmit only the necessary initial synchronization parameters rather than all possible parameters. The remaining parameters are obtained through subsequent uplink signals, applying partial action to reduce signaling complexity while maintaining completeness through the full signal sequence.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may communicate with a first network entity associated with a network energy savings (NES) cell and a second network entity associated with an anchor cell. In some examples, the UE may receive assistance information from the anchor cell including an indication of parameters for establishing communications with the NES cell. The UE may receive a first signal from the NES cell that indicates a first portion of the parameters. The first portion may be based on the assistance information. The UE may transmit a wake up signal (WUS) to the NES cell including an indication of the first portion of the parameters. The NES cell may receive the WUS and transmit a second signal including an indication of the remaining one or more parameters to the UE based on receiving the first signal.