UE Skipping SPS Control Element Uplink Transmissions
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Solution Overview
Problem
In wireless communication systems, particularly in those using semi-persistent scheduling (SPS), there is a need to conserve power and processing resources at user equipment (UE) by avoiding the transmission of control elements when the data buffer is empty, as transmitting empty control elements consumes resources without providing additional information to the base station.
Innovation Solution
The UE is configured to receive a semi-persistent scheduling configuration from the base station and refrain from transmitting control elements, such as power headroom reports or buffer status reports, during uplink periods when the data buffer is empty, thereby conserving resources and avoiding unnecessary transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If control elements are transmitted during every uplink period in SPS, then the base station receives complete information, but power consumption and processing resources at the UE are wasted
Solution Approach 1:
The patent applies partial action by transmitting control elements only when necessary (when data buffer is non-empty or specific events occur) rather than during every uplink period. This selective transmission reduces power consumption and processing resources at the UE while ensuring the base station receives sufficient information to maintain effective scheduling decisions.
2Productivity
If control elements are transmitted only when data is available, then resource usage is optimized, but the base station may lose critical information about empty buffer states
Solution Approach 1:
The patent implements feedback mechanisms where the UE monitors specific events (data arrivals, buffer emptying, SPS activation/deactivation) and provides targeted control element transmissions when these events occur. This feedback approach ensures the base station receives critical buffer status information changes without requiring continuous transmissions, thereby optimizing resource usage while maintaining information accuracy.
3Reliability
If continuous control element transmission is performed, then the base station maintains accurate scheduling information, but processing loads at both UE and base station increase
Solution Approach 1:
The patent uses periodic SPS uplink transmissions as the foundation, with control elements transmitted periodically only when triggered by specific events. This periodic action with event-driven modifications maintains reliable scheduling information at the base station while significantly reducing processing loads compared to continuous transmission, as control elements are sent only when buffer status changes or data becomes available.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, a semi-persistent scheduling (SPS) configuration associated with the UE. Additionally, the UE may refrain from transmitting a control element within an uplink period, associated with the SPS configuration, when a buffer of data intended for the base station is empty. For example, the UE may increase a period associated with the control element. Additionally, or alternatively, the UE may randomly select the control element, to refrain from transmitting, from a plurality of control elements within a period of time. Numerous other aspects are described.