Layer 1/2 Triggered Mobility Conditions for Heterogeneous Cells
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing layer 1 or layer 2 triggered mobility, particularly in heterogeneous networks with varying cell sizes and technologies, leading to suboptimal resource allocation and user experience.
Innovation Solution
Implementing a mechanism that dynamically adjusts network configurations based on specific criteria such as wireless device capabilities, traffic load, and initial system setup to optimize mobility management and resource allocation across different technologies and releases, including LTE and 5G.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional mobility management mechanisms are used in heterogeneous networks, then basic connectivity is maintained, but resource allocation efficiency deteriorates due to varying cell sizes and technologies
Solution Approach 1:
The patent implements dynamic mobility management by introducing layer 1/layer 2 triggered mobility that adapts to real-time network conditions. The system dynamically selects between different mobility mechanisms (layer 3 RRC-based or layer 1/2 MAC/PHY-based) based on device capabilities, traffic conditions, and network state, enabling efficient resource allocation across heterogeneous networks with varying cell sizes and technologies.
Solution Approach 2:
The system changes operational parameters by introducing new mobility trigger conditions at layer 1 and layer 2, modifying the traditional layer 3 RRC-based mobility. It adjusts mobility behavior based on device capabilities, traffic load, and network configuration, allowing optimal resource allocation across different network technologies and releases.
2Speed
If layer 3 RRC-based mobility is used, then comprehensive control is achieved, but mobility triggering speed deteriorates due to higher layer processing delays
Solution Approach 1:
The patent segments mobility management into multiple layers: layer 3 RRC-based mobility for comprehensive control, and new layer 1/layer 2 triggered mobility for fast execution. This segmentation allows the system to use simplified lower-layer mechanisms when speed is critical while maintaining the ability to use higher-layer comprehensive control when needed, resolving the contradiction between speed and complexity.
Solution Approach 2:
The system introduces an intermediary mechanism where layer 1 and layer 2 entities can autonomously trigger mobility based on predefined conditions, acting as intermediaries between physical layer observations and layer 3 RRC decisions. This intermediary layer enables faster mobility triggering without completely eliminating the comprehensive control capabilities of layer 3 RRC.
3Adaptability or versatility
If network configurations are statically optimized, then initial performance is improved, but adaptability to varying traffic conditions deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the system continuously monitors device capabilities, traffic conditions, and network state, then adjusts mobility management strategies in real-time. The network receives feedback from UEs about their capabilities and current conditions, and uses this feedback to dynamically optimize resource allocation and mobility triggering, maintaining both adaptability and productivity.
Data Source
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AI summary
A method comprises sending, by a central unit (CU) of a base station to a distributed unit (DU) of the base station, one or more messages comprising an identifier of a candidate cell of a conditional layer 1 or layer 2 triggered mobility (LTM) and a request for an execution condition of the conditional LTM. The method further comprises receiving, from the DU, a message indicating the execution condition, for the candidate cell, of the conditional LTM. The method further comprises sending, to a wireless device, a radio resource control (RRC) message comprising an LTM configuration including the execution condition, for the candidate cell, of the conditional LTM.