Enhanced Scheduling Request for Wireless Power Optimization
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in power consumption and signaling resource waste due to the need for multiple steps in scheduling requests for uplink grants, particularly in connected mode discontinuous reception (CDRX) scenarios, where UEs often cannot transition to sleep mode promptly, leading to unnecessary power usage.
Innovation Solution
The introduction of an enhanced scheduling request (SR) that includes information independent of uplink grant requests, allowing UEs to transmit requests for DRX MAC control elements or other notifications directly at the physical layer, reducing the number of steps and conserving power and signaling resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional scheduling request procedure is used, then uplink grant request can be transmitted, but multiple steps are required and power consumption increases
Solution Approach 1:
The patent combines the scheduling request transmission and DRX MAC CE indication into a single physical layer message. The UE transmits both the scheduling request and the DRX MAC CE indication simultaneously in one PUCCH transmission, eliminating the need for separate signaling steps and reducing power consumption by allowing earlier sleep mode transition.
Solution Approach 2:
The patent enables preliminary action by allowing the UE to indicate DRX MAC CE request in advance within the scheduling request message itself. This preliminary indication allows the network to prepare and send the DRX MAC CE in a subsequent downlink transmission, enabling the UE to enter sleep mode earlier without waiting for additional uplink transmissions.
2Reliability
If multiple signaling steps are used for scheduling request, then complete communication can be achieved, but signaling resource waste occurs
Solution Approach 1:
The patent merges multiple signaling functions into a single message structure. The scheduling request message simultaneously carries both the uplink grant request indication and the DRX MAC CE indication, reducing the number of separate signaling transmissions required and conserving signaling resources while maintaining communication completeness.
Solution Approach 2:
The patent makes the scheduling request message universal by enabling it to perform multiple functions: requesting uplink grant, indicating DRX MAC CE request, and providing scheduling information. This multi-functionality reduces the need for separate dedicated messages for each function, thereby reducing signaling overhead.
3Reliability
If UE waits for uplink grant before entering sleep mode, then proper scheduling can be ensured, but power consumption increases
Solution Approach 1:
The patent applies preliminary action by having the UE indicate its DRX MAC CE request and scheduling needs in advance within the initial scheduling request message. This allows the network to prepare the necessary downlink transmissions and scheduling decisions beforehand, enabling the UE to safely transition to sleep mode earlier without compromising scheduling reliability.
Solution Approach 2:
The patent establishes a feedback mechanism where the UE's scheduling request message includes feedback information about its sleep mode intent and scheduling needs. The network uses this feedback to adjust its downlink transmission timing, ensuring that necessary data is transmitted before the UE enters sleep mode, thus maintaining scheduling reliability while enabling earlier power-off.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may select information indicating a request or a notification that is independent of a request for an uplink grant. The UE may transmit the information in a message associated with a scheduling request. Numerous other aspects are described.