Dynamic SRS Triggering for Flexible 5G Uplink Slot Timing
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently supporting various services, particularly in 5G networks, due to the need for smooth transmission of uplink data and the efficient use of uplink and downlink channels, especially in scenarios involving diverse service requirements such as enhanced mobile broadband, massive machine-type communication, and ultra-reliable low-latency communication.
Innovation Solution
A method and apparatus for transmitting and receiving an uplink reference signal (SRS) are developed, allowing terminals and base stations to utilize higher layer signaling and downlink control information to dynamically trigger SRS transmission in available slots, counting from a reference slot, thereby optimizing channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink reference signal transmission is dynamically triggered using higher layer signaling and downlink control information, then channel utilization efficiency is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic triggering of SRS transmission through downlink control information that can be received at different slots. The terminal determines transmission timing based on dynamic indicators rather than fixed schedules, allowing flexible adaptation to varying channel conditions and service requirements. This dynamic mechanism improves channel utilization efficiency by activating SRS only when needed for diverse 5G services.
Solution Approach 2:
The patent configures available slots in advance through higher layer signaling, preparing the terminal with predetermined time resources for potential SRS transmission. This preliminary configuration allows the terminal to efficiently utilize channel resources without requiring complex real-time decision-making, thereby improving productivity while managing system complexity through pre-established frameworks.
2Loss of time
If SRS transmission timing is dynamically adjusted counting from reference slot, then latency is reduced, but timing precision requirements increase
Solution Approach 1:
The patent employs downlink control information as a feedback mechanism that dynamically indicates optimal SRS transmission timing based on current system conditions. This feedback loop allows the terminal to adjust transmission timing to minimize latency while the network manages timing precision requirements through standardized control protocols, achieving low latency without excessive precision burdens.
Solution Approach 2:
The patent changes the timing parameter from fixed absolute timing to relative timing based on reference slots and dynamic indicators. This parameter transformation allows flexible timing adjustment to reduce latency while maintaining precision through standardized offset mechanisms, enabling the system to adapt to varying service requirements across different time slots.
3Adaptability or versatility
If multiple services are supported with diverse requirements, then adaptability is improved, but resource allocation complexity increases
Solution Approach 1:
The patent implements a universal SRS transmission mechanism that serves multiple 5G services (enhanced mobile broadband, massive machine-type communication, ultra-reliable low-latency communication) through a single standardized framework. The dynamic triggering mechanism based on downlink control information provides multi-functionality, allowing the same procedure to adapt to different service requirements without increasing resource allocation complexity.
Solution Approach 2:
The patent segments the SRS transmission process into distinct phases: configuration phase (higher layer signaling), triggering phase (downlink control information), and transmission phase (SRS in available slots). This segmentation allows the system to handle diverse service requirements through standardized phases, improving adaptability while managing complexity through modular processing of different service types.
Data Source
AI summary
A terminal and a method performed by the terminal are provided for use in a wireless communication system. The method includes receiving configuration information associated with a sounding reference signal (SRS) by higher layer signaling; receiving downlink control information (DCI) for triggering the SRS; and transmitting, based on the configuration information and the DCI, the SRS in an available slot counting from a reference slot.