L1/L2 Handover via Characteristic Sequences in Beamforming
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Solution Overview
Problem
Beam-based communications in wireless communication systems, particularly in Massive MIMO and LTE systems, face challenges such as increased delay and ping-pong effects during inter-cell handover, which hinder efficient handover processes and user performance at cell boundaries.
Innovation Solution
A method and device for Layer 1/2 inter-cell handover and mobility management that involves transmitting a characteristic sequence and target signal, monitoring signaling, and initiating random access to the target cell upon beam link failure, without establishing an RRC connection, to expedite handover and reduce interactions with Layer 3 processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam-based communications are used in Massive MIMO systems, then communication quality is enhanced through narrow beamforming, but inter-cell handover delay increases and ping-pong effects occur
Solution Approach 1:
The patent applies preliminary action by pre-configuring beam information and handover parameters before actual handover occurs. The network prepares beam switching configurations and timing advance parameters in advance, enabling faster execution when handover is needed, thus reducing handover delay while maintaining beamforming's communication quality benefits
Solution Approach 2:
The patent implements dynamics by making beam switching adaptive and flexible. The system dynamically adjusts beam directions, switching between different beamforming configurations based on real-time channel conditions and UE location, allowing the system to optimize communication quality while minimizing handover time through dynamic beam realignment
2Ease of operation
If traditional Layer 3 handover mechanism is used, then handover control is centralized, but handover speed is reduced due to measurement reporting and multiple interactions between serving and target cells
Solution Approach 1:
The patent applies segmentation by dividing the handover process into independent Layer 1/2 physical layer actions and Layer 3 control actions. The physical layer handles beam switching and signal transmission independently, enabling fast execution without waiting for complete Layer 3 processing, thus increasing handover speed while maintaining centralized control through selective Layer 3 involvement
Solution Approach 2:
The patent uses an intermediary approach by introducing dedicated handover signaling messages and control elements that mediate between the serving cell and target cell. These intermediaries coordinate beam information exchange and timing parameters, enabling faster handover execution by reducing direct complex interactions between cells while maintaining controlled coordination
Data Source
AI summary
The present application discloses a method and a device in a node for wireless communications. A node firstly transmits a first characteristic sequence and a target signal; and monitors a first signaling in a first time window; and when the first signaling is detected, demodulates a first signal; a channel occupied by the first characteristic sequence includes a RA-related channel; the target signal comprises a first identifier, while the first signal comprises the first identifier and a second identifier, and CRC comprised in the first signaling is scrambled by a third identifier; the first signaling indicates the first signal; the target signal is used to trigger the first signal; the first identifier and the second identifier are respectively C-RNTIs, and the third identifier is different from the first identifier. This application optimizes the method and device for physical-layer mobility management under beamforming with an intent of improving positioning performance.