Terminal Cell Access Indication for Reliable L1/L2 Handover
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Solution Overview
Problem
Current communication technologies do not specify the subsequent operations for triggering service cell change using Layer 1 (L1) or Layer 2 (L2) commands, leading to inconsistent behavior between the terminal and the network-side, potentially resulting in switching failures.
Innovation Solution
The method involves a terminal sending first indication information or uplink data to a network-side device after successfully accessing a target cell, using L1/L2 commands, to indicate successful access, which can include uplink radio resource control (RRC) messages, uplink control information (UCI), or pre-configured dedicated uplink signals, through channels like physical uplink shared channel (PUSCH) or uplink shared channel (UL-SCH), to ensure consistent behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If L1/L2 commands are used to trigger service cell change, then mobility management speed is improved, but the lack of specified subsequent operations causes inconsistent behavior between terminal and network-side
Solution Approach 1:
The patent introduces a feedback mechanism where the terminal sends indication information to the network-side device after successfully accessing the target cell. This feedback loop ensures that both parties have consistent understanding of the handover status, resolving the behavior inconsistency problem while maintaining the fast mobility management enabled by L1/L2 commands.
Solution Approach 2:
The patent specifies preliminary actions that must be taken after L1/L2 command-triggered cell change, including sending indication information and performing random access. By defining these preliminary operations in advance, the patent ensures consistent behavior between terminal and network-side while preserving the speed advantage of L1/L2 triggering.
2Productivity
If L1/L2 commands are used for service cell change, then handover efficiency is improved, but switching failure rate increases due to undefined subsequent operations
Solution Approach 1:
The patent implements feedback through indication information sent from terminal to network-side after successful target cell access. This confirms handover completion and allows the network-side to update its state, thereby improving switching success rate while maintaining the high efficiency of L1/L2-triggered handovers.
Solution Approach 2:
The terminal autonomously determines when it has successfully accessed the target cell and initiates the sending of indication information without waiting for network-side polling. This self-service approach reduces unnecessary signaling and maintains handover efficiency while ensuring reliable completion confirmation.
3Reliability
If traditional L3 triggering is used for service cell change, then behavior consistency is maintained, but mobility management speed decreases
Solution Approach 1:
The patent creates a universal handover framework where L1/L2 commands can trigger service cell change with defined subsequent operations. This multi-functional approach allows the system to use faster L1/L2 triggering while maintaining behavior consistency through standardized procedures, eliminating the need to rely solely on slower L3 triggering.
Data Source
AI summary
An indication method, a terminal and a network-side device are provided in the present disclosure, the indication method including: a terminal receiving a first command, where the first command is a Layer 1 command and/or a Layer 2 command; after the terminal successfully accesses a target cell according to the first command, the terminal sending first indication information and/or uplink data to a network-side device; where the first indication information is configured to indicate that the terminal successfully accesses the target cell.