Aperiodic SRS Offset Reconfiguration for Low-Latency UE 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 improvements for better UE scheduling and reduced latency.
Innovation Solution
A cellular base station dynamically configures aperiodic SRS triggering offsets for user equipment (UE) by adjusting the offset configuration after a radio resource connection is established, using medium access control (MAC) control elements or downlink control information (DCI), and applies these offsets to multiple component carriers or bandwidth parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If static SRS triggering offset configuration is used during RRC establishment, then initial connection setup is simplified, but UE scheduling flexibility and latency are reduced
Solution Approach 1:
The patent implements dynamic adjustment of SRS triggering offsets by introducing MAC CE signaling that allows the base station to update offset configurations after RRC connection establishment. This enables the system to transition from static to dynamic offset configuration, providing UE scheduling flexibility while maintaining manageable complexity through standardized signaling procedures.
Solution Approach 2:
The patent changes the timing parameter (triggering offset) from a fixed RRC-configured value to a dynamically adjustable parameter via MAC CE signaling. This allows the offset value to be modified without re-establishing the RRC connection, enabling flexible UE scheduling and reduced latency while keeping the configuration mechanism simple and standardized.
2Productivity
If dynamic adjustment of SRS triggering offset is implemented, then UE scheduling flexibility and latency are improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent uses MAC CE signaling, which is a universal control mechanism already present in LTE systems, to carry SRS triggering offset adjustments. This multi-functional signaling approach allows the same MAC CE structure to handle multiple purposes (scheduling commands, offset adjustments, resource allocations) thereby improving channel assessment efficiency without proportionally increasing signaling overhead.
3Loss of time
If SRS triggering offset is configured only during RRC establishment, then initial connection setup is simple, but latency in channel quality assessment increases
Solution Approach 1:
The patent performs preliminary configuration of SRS triggering offsets during RRC establishment, establishing a baseline configuration. Subsequent MAC CE signaling then allows for rapid adjustments without requiring full re-configuration procedures, thereby reducing latency in channel quality assessment while keeping configuration management complexity manageable through a two-stage approach.
Solution Approach 2:
The patent transitions from static configuration to dynamic adjustment by introducing MAC CE signaling that enables real-time modification of SRS triggering offsets. This dynamic mechanism allows the system to adapt to changing channel conditions and scheduling requirements, significantly reducing latency in channel quality assessment while maintaining manageable complexity through standardized signaling procedures.
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.