L1/L2 Mobility Switching Using Timing Advance to Skip Random Access
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Solution Overview
Problem
Frequent movement of terminal devices triggers excessive random access procedures in candidate cells, leading to high power consumption and interference, which existing communication methods fail to adequately address.
Innovation Solution
The terminal device reports timing advance (TA) information of candidate cells to the network device, allowing the network device to determine if random access procedures are necessary, thereby reducing the number of such procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device initiates random access procedures to all candidate cells to obtain timing advances, then the network device can determine appropriate cells for switching, but the quantity of random access procedures increases excessively
Solution Approach 1:
The terminal device performs random access procedures in advance for some candidate cells before the cell switch is actually triggered. The obtained timing advance information is stored and reused when cell switching occurs, avoiding the need to perform random access procedures again at the moment of switching. This preliminary action reduces the quantity of random access procedures while ensuring reliable cell switch decisions.
2Loss of information
If the terminal device initiates excessive random access procedures to obtain timing advances of all candidate cells, then complete timing advance information is available, but power consumption increases
Solution Approach 1:
Instead of performing random access procedures for all candidate cells, the terminal device performs random access procedures only for a subset of candidate cells based on certain criteria (such as measurement results or network configuration). This partial action provides sufficient timing advance information for practical cell switching while significantly reducing power consumption compared to exhaustive random access procedures.
3Reliability
If the terminal device initiates excessive random access procedures to obtain timing advances, then all candidate cells can be properly evaluated, but random access interference increases
Solution Approach 1:
The terminal device performs random access procedures in advance for selected candidate cells and stores the obtained timing advance information. When cell switching is triggered, the stored timing advance information is reused, avoiding additional random access procedures that would generate interference. This approach maintains accurate candidate cell evaluation while minimizing random access interference.
Data Source
AI summary
This application provides a communication method and a communication apparatus, which are applied to the field of L1/L2 triggered mobility. The method includes: A first network device receives information about a timing advance (TA) of a first candidate cell, where the first candidate cell does not belong to the first network device; and the first network device sends an identifier of a target cell of a switch and first indication information to a terminal device, where the first indication information indicates to access the target cell in a random access channel-skip manner, and the target cell is the first candidate cell.