PUSCH Repetition Scheduling Across Slot Boundaries for URLLC
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Solution Overview
Problem
Existing wireless communication systems face challenges in transmitting large data payloads across slot boundaries, leading to increased latency and reliability issues, particularly in ultra-reliable low latency communication (URLLC) due to insufficient symbols within a single slot for complete data transmission, necessitating delayed transmissions and inefficient resource utilization.
Innovation Solution
The user equipment (UE) receives signaling with an uplink grant that includes a time domain resource assignment spanning multiple slots, identifies symbol directions, and determines a subset of symbols for data repetitions, allowing transmissions to span slot boundaries, including uplink, downlink, and flexible symbols, while ignoring dynamic indications for certain traffic types like URLLC, to optimize data scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data transmission is confined within a single slot, then resource allocation is simplified and timing is predictable, but transmission capacity is insufficient for large data payloads and latency increases when delayed to subsequent slots
Solution Approach 1:
The patent segments the data transmission across multiple slots by introducing a slot boundary indication field in the downlink control information. This allows the uplink data transmission to be divided into parts that can span across slot boundaries, with the slot boundary indication specifying whether the transmission should continue into the next slot. This segmentation resolves the contradiction by enabling larger payloads without requiring complete re-allocation of resources.
Solution Approach 2:
The patent introduces dynamic slot boundary indication signaling that allows flexible extension of uplink transmissions across slot boundaries based on data payload size requirements. The slot boundary indication field enables the system to dynamically adjust transmission timing and slot utilization, transforming the rigid single-slot constraint into a flexible multi-slot capability while maintaining efficient resource allocation.
2Reliability
If data transmission is delayed to subsequent slots, then proper code rate can be utilized, but latency increases which affects URLLC reliability
Solution Approach 1:
The patent prepares for potential slot boundary crossings in advance by including slot boundary indication fields in the downlink control information before transmission begins. This preliminary configuration allows the system to plan for extended transmissions without actual delays, enabling URLLC applications to maintain low latency by pre-authorizing cross-slot transmissions when needed while preserving the option to use proper code rates.
3Productivity
If multiple symbols within a slot are used for data transmission, then transmission duration can be extended, but the number of available symbols may be insufficient for complete payload transmission
Solution Approach 1:
The patent adds a temporal dimension to data transmission by allowing it to extend across slot boundaries into subsequent slots. Instead of being constrained to a single slot's symbol limit, transmissions can now utilize symbols from multiple consecutive slots, effectively increasing the available transmission duration while maintaining the same symbol rate within each slot. This dimensional extension resolves the insufficiency of symbols within a single slot.
Data Source
AI summary
This disclosure provides methods, devices, and systems for physical uplink shared channel (PUSCH) repetition based on support signaling, such as an uplink grant that includes a time domain resource assignment for transmitting one or more data repetitions that may cross a slot boundary. The UE may identify directions (for example, uplink, downlink, flexible) for one or more symbols spanning a transmission duration of the time domain resource assignment. The directions may be determined using a dynamic slot format indication (SFI), or semi-static SFIs may be used as a fallback (when dynamic slot format indications do not meet a target reliability). The uplink grant may include an indication of which symbol directions can be used for the one or more data repetitions. A subset of the one or more symbols for scheduling the one or more data repetitions may be determined based on the identified directions.