Type4-PDCCH CSS for Small Data Transmission in 5G
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Solution Overview
Problem
Current wireless communication networks face inefficiencies in handling small data transmissions in the RRC_INACTIVE state, particularly in 5G networks, due to high signaling overhead and potential collisions during random access procedures, which affect latency and resource utilization.
Innovation Solution
The implementation of a new Common Search Space (Type4-PDCCH CSS) or User-specific Search Space (USS) to schedule subsequent packet transmissions, allowing for separate or partially overlapping radio resource sets, thereby offloading legacy traffic and reducing interference with existing CSSs, and maintaining USS configurations during UE lifespan and cell reselection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a new Common Search Space (Type4-PDCCH CSS) or User-specific Search Space (USS) is implemented to schedule subsequent packet transmissions, then communication efficiency is improved and latency is reduced, but device complexity and network configuration complexity increase
Solution Approach 1:
The patent segments the PDCCH search space resources by introducing a new Type4-PDCCH CSS specifically for SDT scheduling, separating it from legacy CSS types. This segmentation allows dedicated resources for small data transmissions while preserving legacy operations, thereby improving communication efficiency without causing interference, though it does increase network configuration complexity
Solution Approach 2:
The patent introduces a new dimension in the search space hierarchy by adding Type4-PDCCH CSS as a distinct category alongside existing CSS types (Type0, Type1, Type2, Type3). This dimensional addition enables specialized scheduling for SDT while maintaining compatibility with legacy structures, improving productivity at the cost of increased system complexity
2Object-affected harmful factors
If separate or partially overlapping radio resource sets are used for Type4-PDCCH CSS, then traffic load balancing is improved and interference with legacy CSS is reduced, but resource management complexity increases
Solution Approach 1:
The patent segments radio resources into separate sets for Type4-PDCCH CSS and legacy CSS, with options for partial overlap. This segmentation reduces harmful interference between SDT traffic and legacy traffic by providing dedicated resource pools, while the partial overlap option allows flexible resource management, though it increases the complexity of resource allocation and management
Solution Approach 2:
The patent applies local quality by allowing different resource set configurations in different cells or for different UEs. The separation or partial overlap of radio resource sets can be configured locally based on traffic conditions, reducing interference in specific areas while maintaining overall system flexibility, though requiring more complex local resource management
3Stability of the object's composition
If USS configurations are maintained during UE lifespan and cell reselection, then service continuity is improved, but signaling overhead and network processing increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring USS parameters during the RRC Release message that transitions the UE to inactive state. These pre-configured parameters remain valid throughout the UE's inactive period and across cell reselections, ensuring service continuity without requiring repeated signaling exchanges, thereby reducing signaling overhead while maintaining stability
Solution Approach 2:
The patent makes the USS configuration universal by designing it to remain valid across multiple cells and during the entire inactive state period. The same USS configuration serves multiple functions: scheduling SDT in the current cell, supporting cell reselection, and enabling subsequent transmissions without reconfiguration, thus improving service continuity while minimizing signaling overhead
Data Source
AI summary
Embodiments herein relate to, for example, a method performed by UE (10) for handling communication in the wireless communications network 1. The UE initiates a random access procedure for small data transmissions; and monitors for a message using a Type4-PDCCH CSS, or a USS, wherein the Type4-PDCCH CSS and/or the USS uses a radio resource set separated or partly overlapping a legacy radio resource set for a legacy CSS.