Aperiodic SRS Slot Determination for NR Timing Alignment
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Solution Overview
Problem
Current New Radio (NR) technologies face challenges in dynamically determining valid slots for aperiodic reference signal (RS) triggering, leading to ambiguous or misaligned SRS transmission timing between user equipment (UE) and the network due to the lack of detailed methods for finding available slots based on slot configuration and dynamic scheduling.
Innovation Solution
The method involves a terminal device receiving an indication for RS triggering and determining a valid slot for transmission based on an indicated timing, considering all symbols in a set of resources as flexible or uplink, to avoid timing ambiguities by identifying candidate slots and selecting the appropriate slot for RS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic RS triggering slot offset indication is allowed, then flexibility of RS triggering is improved, but timing alignment between UE and network deteriorates due to ambiguity in finding valid slots
Solution Approach 1:
The patent applies dynamics by enabling dynamic selection of valid slots for RS transmission based on real-time slot configuration. The UE determines valid slots dynamically by checking whether all symbols in candidate slots are flexible or uplink, allowing the system to adapt to changing TDD configurations while maintaining reliable timing alignment through standardized determination rules.
Solution Approach 2:
The UE performs self-service by autonomously determining valid slots for RS transmission based on received slot configuration information and predefined criteria. The terminal device independently identifies candidate slots, checks their symbol types, and selects appropriate transmission slots without requiring additional network coordination, thus resolving timing alignment issues while maintaining flexibility.
2Device complexity
If detailed methods for finding valid slots are not provided, then device complexity is reduced, but communication reliability deteriorates due to timing ambiguity
Solution Approach 1:
The UE autonomously determines valid slots by applying predefined criteria to slot configuration information received from the network. The terminal device independently checks whether all symbols in candidate slots are flexible or uplink and selects appropriate transmission slots without requiring complex network coordination procedures, thus maintaining low device complexity while ensuring reliable timing alignment.
Solution Approach 2:
The network provides slot configuration information in advance, enabling the UE to pre-determine valid slots for RS transmission before actual transmission occurs. This preliminary provision of configuration data allows the UE to autonomously identify suitable slots without requiring complex real-time coordination, balancing simplicity with reliability.
3Reliability
If a predetermined range for slot selection is used, then timing alignment is improved, but flexibility in slot selection is reduced
Solution Approach 1:
The patent enables dynamic slot selection within a predetermined range by allowing the UE to identify candidate slots based on timing offset indications and then filter these candidates based on slot configuration. The UE selects from multiple valid slots within the range based on real-time conditions, maintaining both timing alignment through the predetermined range and flexibility through dynamic selection among multiple valid options.
Solution Approach 2:
The patent segments the slot selection process into distinct stages: first identifying candidate slots within a predetermined timing range, then filtering these candidates to determine valid slots based on symbol type criteria, and finally selecting an appropriate slot for transmission. This segmentation allows the system to maintain timing alignment through the predetermined range while providing flexibility through multi-stage validation and selection.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for communication of a RS. According to embodiments of the present disclosure, the terminal device receives information indicating a set of resources for transmitting a reference signal from the network device. If the terminal device receives an indication in a reference signal trigger slot for triggering a transmission of the reference signal, the terminal device determines a slot for transmitting the reference signal. The terminal device determines whether the slot is valid based on a slot configuration. In this way, it can avoid the SRS transmission timing ambiguous or misalignment between UE and network.