Shared Channel Splitting Across Slot Boundaries for Low Latency

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Solution Overview

Problem

Existing wireless communication systems face limitations in scheduling flexibility, particularly in NR Rel. 15, which restrict transmissions from crossing slot boundaries, leading to increased latency for critical data transmissions requiring low latency and high reliability.

Innovation Solution

The method involves splitting a physical shared channel allocation that crosses a slot boundary into two allocations in separate slots, allowing for seamless communication across the boundary without additional signaling overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If transmissions are restricted from crossing slot boundaries (NR Rel. 15), then slot-based processing is maintained, but latency increases for critical data transmissions

Engineering Contradiction:

ImprovelatencyVSAvoidscheduling flexibility

Core Design Contradiction:

Loss of timeVSAdaptability or versatility

Solution Approach 1:

The patent segments a single transmission that would cross a slot boundary into multiple separate transmissions, each confined within its own slot. The network node divides the transport block into multiple codeblocks and schedules them in separate slots, maintaining slot boundary integrity while enabling effective cross-slot communication through multiple independent transmissions.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If transmissions are delayed to the beginning of the next slot, then slot boundary restrictions are maintained, but transmission latency increases

Engineering Contradiction:

Improvetransmission timingVSAvoidlatency

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The network node performs preliminary scheduling decisions to identify when a transmission would cross a slot boundary. By detecting this condition in advance, the system can proactively split the transmission into multiple parts and schedule them in separate slots, preventing the need to wait for the next slot boundary and thereby reducing latency.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If multiple separate transmissions are used instead of a single cross-slot transmission, then slot boundary restrictions are maintained, but scheduling flexibility is reduced

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidscheduling flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The system dynamically adapts its transmission strategy based on the timing of data arrival relative to slot boundaries. When data arrives such that a single transmission would cross a slot boundary, the system dynamically switches to a multi-transmission approach. This dynamic adaptation maintains reliability by ensuring each transmission stays within slot boundaries while preserving scheduling flexibility through context-aware decision-making.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260089697A1Physical shared channel splitting at slot boundaries

Publication Date: 2026.03.26 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method, system and apparatus are disclosed. A network node configured to communicate with a wireless device (WD) is provided. The network node includes processing circuitry configured to cause the network node to: indicate a splitting of an initial physical shared channel allocation that crosses a slot boundary into at least a first physical shared channel allocation in a first slot and a second physical shared channel allocation in a second slot; and communicate with the wireless device, WD, according to the at least the first physical shared channel allocation and the second physical shared channel allocation.