Aperiodic SRS Trigger Offset Updates for Uplink Scheduling
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Solution Overview
Problem
Current cellular communication systems face challenges in efficiently configuring aperiodic sounding reference signals (SRS) to assess uplink channel quality, particularly in high-density mobile broadband scenarios, necessitating improved flexibility and efficiency in UE scheduling.
Innovation Solution
A cellular base station dynamically configures aperiodic SRS triggering offsets by adjusting the timing of SRS transmission through MAC control elements or DCI, considering minimum timing offsets provided by user equipment (UE), applicable across multiple component carriers or bandwidth parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If aperiodic SRS triggering offset is statically configured during RRC establishment, then device complexity is reduced, but adaptability deteriorates
Solution Approach 1:
The patent implements dynamic configuration of aperiodic SRS triggering offsets by introducing MAC CE signaling that can update the offset values after initial RRC configuration. This allows the system to switch from a static configuration to a dynamic one, where the triggering offset can be adjusted in real-time based on channel conditions and scheduling requirements, thereby improving adaptability while maintaining manageable complexity through standardized signaling procedures.
Solution Approach 2:
The patent changes the parameter configuration approach by allowing the aperiodic SRS triggering offset to be modified through MAC CE signaling with specific parameter fields (e.g., triggering offset for first/second SRS). This enables the system to adapt parameters dynamically without changing the overall configuration structure, resolving the contradiction between maintaining simple device complexity and achieving high adaptability.
2Adaptability or versatility
If aperiodic SRS triggering offset is dynamically adjusted via MAC CE or DCI, then scheduling flexibility is improved, but device complexity increases
Solution Approach 1:
The patent segments the configuration process into two distinct stages: initial RRC configuration that establishes the basic framework, and subsequent MAC CE signaling that provides dynamic adjustments. This segmentation allows the system to maintain the simplicity of static configuration while adding dynamic flexibility through a separate, standardized signaling layer, thereby improving scheduling flexibility without excessively increasing overall device complexity.
Solution Approach 2:
The patent performs preliminary configuration through RRC signaling before enabling dynamic adjustments via MAC CE. This preliminary action establishes the foundational configuration parameters, allowing subsequent dynamic adjustments to build upon a stable base. This approach improves scheduling flexibility while managing device complexity by preparing the system in advance with standardized configuration procedures.
3Reliability
If minimum timing offset is considered in dynamic configuration, then reliability is improved, but productivity decreases
Solution Approach 1:
The patent incorporates feedback mechanisms where the UE reports its minimum timing offset capability to the network, and the network uses this feedback to appropriately configure the aperiodic SRS triggering offset. This feedback loop ensures that timing accuracy requirements are met while allowing the system to optimize configuration speed by avoiding overly conservative settings, thereby balancing reliability and productivity.
Data Source
AI summary
A cellular base station (BS) which determines an aperiodic sounding reference signal (SRS) triggering offset configuration specifying an offset between an aperiodic SRS trigger received by a user equipment (UE) and transmission of the SRS by the UE. The cellular base station may determine that the SRS triggering offset should be adjusted. In response, the cellular base station may transmit signaling to the UE specifying a new value for the aperiodic SRS triggering offset. The new SRS triggering offset value may be partly based on a minimum timing offset for the UE and may be contained in a medium access control (MAC) control element (CE) or in downlink control information (DCI). Additionally, the new triggering offset value may be applicable for a plurality of component carriers or bandwidth parts. The cellular base station may also determine a new triggering offset value due to conflicts regarding the AP-SRS transmission.