Reference-Signal Beam Switching Across Non-Collocated RRHs
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Solution Overview
Problem
In high-speed train scenarios operating at higher frequencies, beam switching between non-collocated remote radio heads (RRHs) leads to timing and frequency synchronization challenges, increasing beam change delay and negatively impacting data throughput.
Innovation Solution
A method and apparatus that inform the network about user equipment type and capability, enabling targeted transmission of reference signals for time and frequency tracking during beam switching, adjusting timing and frequency as needed based on UE type and beam colocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beam switching is performed between non-collocated RRHs in high-speed train scenarios, then network coverage and connectivity are improved, but timing and frequency synchronization challenges increase beam change delay
Solution Approach 1:
The patent applies preliminary action by having the UE indicate its type and capability before beam switching occurs. The network element uses this advance information to determine whether to transmit reference signals for time and frequency tracking, preparing the switching process in advance to minimize delays. This is evident in step 600 where the UE informs the network element about its type and capability before the actual beam switching takes place.
Solution Approach 2:
The patent changes the parameter of reference signal transmission based on UE type and capability. For certain UE types, reference signals are transmitted to enable time and frequency tracking, while for other types, the network may rely on existing tracking. This dynamic parameter adjustment optimizes the beam switching process for different device capabilities, reducing beam change delay where needed while maintaining simplicity where possible.
2Measurement precision
If reference signals are transmitted for time and frequency tracking during beam switching, then synchronization accuracy is improved, but signal overhead and processing complexity increase
Solution Approach 1:
The patent applies local quality by transmitting reference signals selectively based on UE type and capability rather than universally. The network element determines locally whether reference signals are needed for a particular UE based on its indicated capabilities. This selective approach provides high measurement precision for UEs that require it while avoiding unnecessary complexity for UEs that can operate without additional reference signals.
Solution Approach 2:
The UE performs self-indication of its type and capability, allowing it to essentially serve itself by informing the network element what tracking capabilities it has. This self-service mechanism reduces the need for complex network-side determination of UE capabilities and enables more efficient, targeted reference signal transmission only when and where needed.
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for enhanced beam switching. A method may include informing a network element about a user equipment type and capability in beam switching from a source beam to a target beam. The method may further include receiving a request from the network element to switch from the source beam to the target beam. The method may also include based on the user equipment type and capability, receiving a reference signal for timing adjustment with the target beam. In addition, the method may include switching from the source beam to the target beam. Further, the method may include adjusting the time or frequency tracking of the target beam after the switching based the reference signal.