UL Wakeup Signal Configuration for Reliable Low-Power Uplink
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Solution Overview
Problem
Existing wireless communication systems, particularly in LTE and 5G NR, face challenges in efficiently managing uplink (UL) wakeup signals (WUS) for connected user equipment (UE), leading to inefficiencies in resource allocation and data transmission.
Innovation Solution
The UE is configured to receive resource and trigger condition indications for UL WUS from a base station, allowing it to detect and respond appropriately, selecting UL WUS resources and transmitting or suspending data based on these conditions, thereby optimizing UL WUS behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE continuously monitors and transmits UL WUS to ensure reliable data transmission, then the reliability of data transmission is improved, but the energy consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) cycles where the base station alternates between active and sleep states. UL WUS transmission opportunities are configured periodically rather than continuously, allowing the UE to enter low-power states while maintaining the ability to transmit wake-up signals when needed. This periodic structure reduces average energy consumption while preserving transmission reliability through scheduled opportunities.
Solution Approach 2:
The UE autonomously determines when to transmit UL WUS based on configured trigger conditions (e.g., buffer status, scheduling requests) without requiring continuous network intervention. The MAC layer self-manages the transmission decisions based on local conditions and configured parameters, enabling the system to maintain reliability while reducing unnecessary transmissions that would consume energy.
2Adaptability or versatility
If multiple UL WUS configurations are provided to support diverse transmission scenarios, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent divides UL WUS configurations into multiple independent configuration sets, each associated with specific resources and trigger conditions. Instead of one complex monolithic configuration, the system segments configurations into manageable units that can be independently selected and applied based on specific transmission scenarios, reducing overall complexity while maintaining versatility.
Solution Approach 2:
The patent enables dynamic selection among multiple UL WUS configurations based on current transmission needs and channel conditions. The UE can adaptively choose appropriate configurations from available sets, allowing the system to optimize between different scenarios (e.g., different periodicities, resources, trigger conditions) without requiring static complex configuration for all possible cases.
3Loss of energy
If the prohibit timer and maximum transmission number are enforced to prevent excessive transmissions, then the loss of energy is reduced, but the productivity decreases
Solution Approach 1:
The patent implements a feedback mechanism where the base station responds to UL WUS transmissions with acknowledgments or scheduling decisions. The prohibit timer and maximum transmission limits are dynamically adjusted based on network feedback and actual transmission outcomes. This feedback loop prevents excessive transmissions by learning from past attempts while maintaining high productivity through adaptive parameter adjustment that allows aggressive transmission when conditions are favorable.
Data Source
AI summary
Apparatuses, systems, and methods for MAC behavior and RRC configuration of uplink wakeup signal (UL WUS) for a connected UE, e.g., in 5G NR systems and beyond. A UE may receive, from a base station, an indication of resources for an UL WUS. The UE may also receive, from the base station, one or more trigger conditions for transmission of the UL WUS. The indication may include a prohibit timer and maximum transmission number per UL WUS resource. The resources for the UL WUS may be periodic or aperiodic UL resources. The one or more trigger conditions for transmission of the UL WUS may be received via a system information block or via radio resource control signaling. The UE configure the UL WUS based, at least in part, on the indication of resources for the UL WUS and the one or more trigger conditions for transmission of the UL WUS.