Paging Occasion Window Extension for Shared Medium Collision Avoidance

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Solution Overview

Problem

In wireless communication systems, particularly in shared unlicensed frequency bands, there is a challenge in efficiently paging user equipment (UEs) without causing cross-link interference and ensuring contention-based access, especially when multiple Radio Access Technologies (RATs) share the same communication medium, leading to potential collisions and difficulties in scheduling paging messages within the limited Paging Occasion Window (POW).

Innovation Solution

The solution involves extending the Paging Occasion Window (POW) to allow for more flexibility in transmitting paging ePDCCH and associated PDSCH repetitions, and establishing non-overlapping Paging Occasion Windows for different paging groups to avoid collisions, thereby ensuring efficient and collision-free paging operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple Radio Access Technologies share the same unlicensed frequency band, then spectral efficiency and capacity are improved, but cross-link interference and collision risks increase

Engineering Contradiction:

Improvespectral efficiencyVSAvoidcross-link interference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent segments the shared unlicensed frequency band into distinct time-domain resources by dividing UEs into different paging groups (first paging group and second paging group). Each group is assigned specific paging occasions within the extended Paging Occasion Window, creating temporal separation that prevents simultaneous transmissions and eliminates cross-link interference while maintaining efficient spectrum utilization.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If the Paging Occasion Window is extended to allow more paging repetitions, then scheduling flexibility is improved, but the window duration and complexity increase

Engineering Contradiction:

Improvescheduling flexibilityVSAvoidPaging Occasion Window duration

Core Design Contradiction:

Adaptability or versatilityVSDuration of action of moving object

Solution Approach 1:

The patent implements dynamic resource allocation within the extended Paging Occasion Window by configuring different paging groups with distinct paging occasions and repetition patterns. The base station dynamically assigns paging repetitions based on UE-specific parameters and channel conditions, allowing flexible scheduling that adapts to varying traffic demands while maintaining manageable window durations through structured group management.

Inventive Principle:

Principle #15Dynamics

3Reliability

If paging messages are transmitted with repetitions for reliability, then communication reliability is improved, but the time required for paging increases

Engineering Contradiction:

Improvepaging reliabilityVSAvoidpaging time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent performs preliminary actions by pre-configuring UEs with paging group identifiers and expected paging occasions before actual paging transmissions. The base station prepares and transmits paging messages with predetermined repetition patterns aligned with each UE's assigned paging group, allowing UEs to efficiently monitor only their designated occasions. This preliminary configuration enables reliable paging through repetitions while minimizing time loss by eliminating unnecessary monitoring of non-assigned occasions.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3713277B1Paging user equipments on a shared communication medium

Publication Date: 2022.12.28 QUALCOMM INC

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AI summary

In an embodiment, an apparatus (e.g., eNB) pages UEs on a shared communication. The apparatus obtains first and second sets of paging messages for transmission to different paging groups. The apparatus establishes non-overlapping POWs for the first and second paging groups to avoid a paging ePDCCH collision.