5G gNB Cell Information Exchange for Mobility Decisions
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Solution Overview
Problem
Current cell information exchange in 5G wireless communication systems, as described in 3GPP TS 38.473 and 38.423, lacks Layer 1 (L1) cell configuration parameters, limiting the ability to estimate performance and compare cells, thereby restricting mobility decisions based on performance gain rather than coverage alone.
Innovation Solution
Distributing L1 cell configuration parameters, such as bandwidth, MIMO layers, modulation order, and subcarrier spacing, between network nodes to enable the estimation of performance gain and facilitate mobility decisions based on performance rather than just coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If current cell information exchange protocols (3GPP TS 38.473 and 38.423) are used, then network nodes can exchange basic cell information, but Layer 1 cell configuration parameters are missing which limits performance estimation capability
Solution Approach 1:
The patent extracts and adds specific Layer 1 cell configuration parameters (bandwidth, MIMO layers, modulation order, subcarrier spacing) to the existing cell information exchange protocol. This extraction enables performance estimation while maintaining compatibility with the original protocol framework.
Solution Approach 2:
The patent modifies the cell information structure by introducing new parameters at Layer 1 configuration level. These parameter changes enhance the information granularity from basic cell identification to detailed physical layer configuration, enabling accurate performance estimation.
2Ease of operation
If mobility decisions are based solely on coverage information, then decision simplicity is maintained, but performance-based optimization is lost
Solution Approach 1:
The patent implements feedback mechanisms where network nodes exchange not only coverage information but also performance metrics derived from Layer 1 configuration parameters. This feedback loop enables mobility decisions that balance simplicity with performance optimization.
Solution Approach 2:
The patent applies partial action by selectively using performance parameters only when needed for optimization decisions, rather than requiring complete performance data for all mobility scenarios. This maintains simplicity for basic coverage-based decisions while enabling performance-based optimization when available.
Data Source
AI summary
A first network node that is a first Next Generation Node B, gNB, is described. The first network node includes processing circuitry configured to receive, from within the first network node, a first information indicative of an open systems interconnection, OSI, Layer 1, L1, configuration of at least two cells served by the first network node. The at least two cells are candidate cells. The processing circuitry is further configured to make a Wireless Device, WD, mobility decision by considering at least a performance gain of the candidate cells. The performance gain is determined based on the received first information indicative of the OSIL1 configuration. Methods, systems, and other apparatuses are also disclosed.