Physical Shared Channel Splitting for Slot-Boundary Scheduling

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Solution Overview

Problem

Existing wireless communication systems face limitations in scheduling flexibility, particularly in crossing slot boundaries, leading to increased latency for critical data transmissions due to restrictions on transmissions across slot borders, which is not allowed in NR Rel. 15, resulting in alignment delays and unsuitable gaps for low latency use cases.

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, thereby enabling efficient low-latency data transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If transmissions are restricted to not cross slot boundaries (NR Rel. 15 rule), then slot structure is maintained and processing is simplified, but latency increases due to alignment delays

Engineering Contradiction:

Improveslot structure processingVSAvoidlatency

Core Design Contradiction:

Device complexityVSLoss of time

Solution Approach 1:

The patent divides a transmission that would cross a slot boundary into two separate transmissions: one ending at the slot boundary and another starting in the next slot. This segmentation allows the system to maintain the no-crossing rule while reducing latency by starting transmission earlier rather than waiting for the next slot boundary.

Inventive Principle:

Principle #1Segmentation

2Reliability

If data transmission waits for next slot boundary, then slot boundary crossing restriction is satisfied, but scheduling flexibility is reduced

Engineering Contradiction:

Improvecompliance with slot boundary ruleVSAvoidscheduling flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent performs preliminary action by scheduling a transmission to end exactly at the slot boundary rather than crossing it. This preliminary positioning allows the subsequent transmission to start as early as possible in the next slot, maintaining compliance while maximizing scheduling flexibility and minimizing latency.

Inventive Principle:

Principle #10Preliminary action

3Loss of time

If multiple shorter transmissions are scheduled instead of one transmission crossing boundary, then latency is reduced, but signaling overhead increases

Engineering Contradiction:

ImprovelatencyVSAvoidsignaling overhead

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent creates a universal transmission structure where a single scheduling decision can result in either one continuous transmission or two segmented transmissions depending on the timing. This multi-functionality allows the system to adapt to different scenarios without requiring separate signaling mechanisms, thus reducing overhead while maintaining latency benefits.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12490245B2Physical shared channel splitting at slot boundaries

Publication Date: 2025.12.02 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.