RIS-Aware UE State Control for DRX Communication Scheduling
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Solution Overview
Problem
The interaction between the state of a reconfigurable intelligent surface (RIS) and the state of a user equipment (UE) can lead to misalignment of the UE's discontinuous reception (DRX) cycle with the RIS's on-state, preventing effective communication between the UE and the base station.
Innovation Solution
A method for a UE or base station to determine its state based on the time pattern of the RIS, including off-state and on-state, by measuring channel conditions and utilizing the RIS's activation states to efficiently schedule communications and conserve power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE follows a conventional DRX cycle independent of RIS state, then the UE can maintain simple power saving operation, but communication effectiveness deteriorates when RIS is in off-state
Solution Approach 1:
The base station transmits RIS time pattern information to the UE in advance, allowing the UE to determine its active state based on predicted RIS states before actual communication occurs. This preliminary information transfer enables the UE to align its DRX cycle with RIS on-states without requiring complex real-time measurements.
Solution Approach 2:
The system establishes a feedback mechanism where the base station provides RIS time pattern information to the UE, and the UE reports its determined active state back to the base station. This feedback loop enables dynamic adjustment of communication scheduling based on RIS state, improving communication effectiveness while managing complexity through structured information exchange.
2Use of energy by moving object
If the UE remains in low-power state continuously, then power consumption is reduced, but communication reliability deteriorates when channel conditions are poor
Solution Approach 1:
The UE dynamically adjusts its power state based on real-time channel condition measurements and RIS state information. When channel conditions are poor and RIS is in off-state, the UE can remain in low-power state without compromising communication reliability, as the base station schedules communications appropriately. When channel conditions improve, the UE can transition to active state to maintain communication reliability.
Solution Approach 2:
The system changes the parameter of UE operational state (active/low-power) based on measured channel conditions and RIS time pattern information. By adjusting this state parameter dynamically rather than maintaining a fixed state, the system optimizes both power consumption and communication reliability according to actual channel conditions.
3Productivity
If the base station schedules communications continuously, then communication productivity is maintained, but power consumption increases when RIS is in off-state
Solution Approach 1:
The base station uses periodic RIS time pattern information to schedule communications in periodic cycles aligned with RIS on-states. Rather than continuous scheduling, the base station schedules communications periodically during RIS on-periods, improving scheduling efficiency while reducing base station power consumption during RIS off-periods.
Solution Approach 2:
The base station receives and processes RIS time pattern information in advance, enabling it to pre-schedule communications during upcoming RIS on-states. This preliminary scheduling action allows the base station to maintain communication productivity during RIS on-periods while avoiding unnecessary power consumption during RIS off-periods.
Data Source
AI summary
A state of a user equipment (UE) may depend on a state of a reconfigurable intelligent surface (RIS). The UE obtains a time pattern of a RIS that defines activation states of the RIS including at least an off-state and an on-state. The UE determines a state of the UE based at least in part on the time pattern of the RIS. The base station also determines the state of the UE and schedules communications with the UE when the UE is in an active state. The UE may measure channel conditions between the UE and a base station when the RIS is in at least the off-state and the on-state. The state of the UE may also be based in part on the channel conditions between the UE and the base station when the RIS is in at least the off-state and the on-state.