Intercell Mobility with Unified Beams and Pre-configured Random Access
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Solution Overview
Problem
Wireless devices face challenges in maintaining seamless communication when handovering from one base station to another, particularly in reducing latency during the process of acquiring timing advance and connecting to a target cell.
Innovation Solution
The solution involves sharing parameters of a target cell with the wireless device before initiating communication, using an identifier like a physical cell identifier in downlink control information to schedule a transmission, and performing a random-access procedure using pre-received preamble and random-access resources to connect to the target cell based on power levels of available resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a wireless device performs a random-access procedure to connect to a target cell during handover, then connection establishment is achieved, but latency is increased due to the time required for timing advance acquisition and random-access resource allocation
Solution Approach 1:
The patent applies preliminary action by pre-configuring the wireless device with target cell parameters including timing advance values and random-access resources before the handover is actually executed. The source base station provides this configuration information in advance, allowing the device to immediately connect to the target cell without performing time-consuming random-access procedures, thereby reducing handover latency while maintaining connection reliability
Solution Approach 2:
The patent uses the source base station as an intermediary to transfer necessary connection parameters from the target base station to the wireless device before handover. This intermediary mechanism allows the device to acquire timing advance and random-access resources through the source base station, eliminating the need for direct random-access communication with the target cell during handover, thus reducing latency while ensuring reliable connection establishment
2Adaptability or versatility
If the wireless device is configured with multiple random-access resources from different cells, then adaptability to different target cells is improved, but device complexity increases due to the need to manage and select appropriate resources
Solution Approach 1:
The patent implements feedback mechanisms where the wireless device monitors signal quality metrics (such as RSRP) of available random-access resources and provides feedback to the base station. Based on this feedback, the base station can guide the device in selecting the most appropriate target cell and corresponding random-access resources, enabling adaptable cell selection while reducing device complexity through centralized decision-making support
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting random-access resource parameters (such as power levels, time slots, and frequency resources) based on current network conditions and device measurements. The base station configures multiple sets of parameters corresponding to different target cells, and the device selects appropriate parameters based on measured signal conditions, thereby achieving adaptability without requiring complex device-side resource management logic
Data Source
AI summary
A wireless device may use intercell mobility to move from a source cell to a target cell. An identifier (e.g., a physical cell identifier (PCI)) indicating a target base station and random access resources for intercell mobility may be provided to the wireless device, via downlink control information (DCI) before the wireless device begins an intercell mobility procedure. The wireless device may initiate intercell mobility between the source base station and the target base station using a random-access procedure upon receipt of the DCI.