UE Power Saving via Self-Learning C-DRX Grant Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
User equipment (UE) experiences increased power consumption when transmitting a scheduling request (SR) outside of an onDuration in a Connected Discontinuous Reception (C-DRX) cycle, leading to unnecessary active processing and power usage during periods where data is not being received from the network.
Innovation Solution
The UE is configured to transmit the SR during a first subframe and initiate active mode processing for grant reception during a subsequent subframe prior to the next onDuration, limiting active processing time and entering sleep mode when no data is expected, using a self-learning mode to predict when control channel information is likely to be received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transmits a scheduling request (SR) outside of an onDuration, then the UE can request data transmission, but the UE must remain active for operations that enable receiving data, increasing power consumption during periods originally scheduled for sleep
Solution Approach 1:
The network transmits the uplink grant in advance before the scheduled onDuration, allowing the UE to enter sleep mode earlier while still receiving the necessary scheduling information. This preliminary action resolves the contradiction by providing the grant before the UE would normally need to be active, thus reducing power consumption while maintaining reliability.
Solution Approach 2:
The patent dynamically adjusts the C-DRX cycle parameters, specifically introducing a drx-SR-Response-Window and modifying when the UE transitions between active and sleep states. This dynamic adaptation allows the system to optimize power consumption based on whether an SR was transmitted outside onDuration, resolving the contradiction by making the active/sleep behavior flexible rather than fixed.
2Reliability
If the UE remains active to perform operations that enable receiving data after transmitting SR outside onDuration, then the UE can detect grants, but this utilizes power during periods where the UE has an opportunity to sleep
Solution Approach 1:
The network provides the uplink grant before the scheduled onDuration by transmitting it during the drx-SR-Response-Window. This preliminary provision of the grant eliminates the need for the UE to remain active during what would otherwise be a sleep opportunity, thus preventing energy loss while maintaining grant detection capability.
Solution Approach 2:
The patent extracts the grant transmission from the traditional timing (during or after onDuration) and places it in an earlier window (drx-SR-Response-Window). This extraction allows the UE to complete its grant detection before the scheduled sleep period, removing the harmful energy consumption during sleep opportunities while preserving the essential function.
3Productivity
If the UE performs operations to detect grants transmitted prior to the next onDuration, then the UE can receive scheduled data, but this increases active processing time and power consumption
Solution Approach 1:
The uplink grant is transmitted in advance during the drx-SR-Response-Window, allowing the UE to complete its processing and data transmission preparation before the scheduled onDuration. This preliminary action reduces the active processing time during the onDuration itself, as the UE already has the grant information and can focus only on data transmission rather than grant detection.
Solution Approach 2:
The patent introduces a periodic drx-SR-Response-Window that occurs at regular intervals within the C-DRX cycle. This periodic structure allows the UE to predict when grants will be transmitted and plan its active/sleep periods accordingly, optimizing the duration of active processing while maintaining data reception capability.
Data Source
AI summary
A device and method for power saving between a scheduling request and a grant. A user equipment (UE) establishes a connection to a network, the UE and the network may be configured with a Connected Discontinuous Reception (C-DRX) functionality, the C-DRX functionality including a cycle with at least one onDuration. The UE transmits, during a first subframe a scheduling request (SR) to the network, the SR corresponds to data that is to be transmitted by the UE. The UE determines a second subframe for the UE to enter an active mode of processing for a reception of a grant, the second subframe is subsequent to the first subframe and prior to a next onDuration. The UE initiates an active mode of processing for the reception of the grant during the second subframe.