Wireless Communication Cell Switching With Targeted Layer 2 Resets
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Solution Overview
Problem
In communication systems with CU-DU separation, unnecessary layer 2 resets occur due to the inability to perform DU replacement before and after a cell switch, leading to delays and packet retransmissions.
Innovation Solution
Perform layer 2 resets only after successful access to a target cell, avoiding unnecessary resets by maintaining RLC caches when access to the first cell fails, and adapting based on network device indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If layer 2 reset is performed before cell switch in CU-DU separation architecture, then switching reliability is improved, but switching delay increases and productivity deteriorates
Solution Approach 1:
The patent changes the timing parameter of layer 2 reset from 'before switch' to 'after successful access'. This parameter change resolves the contradiction by eliminating the delay caused by pre-switch reset while ensuring reliability through post-access reset only when needed.
Solution Approach 2:
The patent introduces dynamic decision-making where the network device determines whether layer 2 reset is needed based on specific conditions (DU replacement occurrence). This dynamic approach allows the system to adapt between reliability-focused and speed-focused modes depending on the switching scenario.
2Reliability
If layer 2 reset is performed before cell switch, then connection reliability is improved, but time loss increases
Solution Approach 1:
The patent applies preliminary action in reverse - instead of performing reset preliminarily before switch, it performs reset only after successful access when truly needed. This resolves the time loss while maintaining reliability for cases requiring DU replacement.
Solution Approach 2:
The patent extracts the unnecessary layer 2 reset operation from the pre-switch procedure, keeping only the essential reset operations that are truly needed for reliability, thereby eliminating time loss from redundant resets.
3Reliability
If layer 2 reset is performed unconditionally, then switching reliability is improved, but packet retransmissions increase
Solution Approach 1:
The patent introduces feedback mechanism where the network device monitors whether DU replacement occurs and provides instructions to the terminal device accordingly. This feedback loop prevents unconditional resets, reducing packet retransmissions while maintaining reliability when needed.
Solution Approach 2:
The patent applies partial action by performing layer 2 reset only in specific cases (when DU replacement occurs) rather than unconditionally for all switches. This partial approach eliminates unnecessary packet retransmissions while maintaining reliability for required cases.
Data Source
AI summary
Provided are a method for wireless communication, a terminal device and a network device. One example method includes performing, by a terminal device, a layer 2 reset after the terminal device accesses a first cell successfully, wherein the first cell is a target cell in a lower layer switch.