Uplink and Downlink BWP Alignment Before Beam Failure Recovery
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Solution Overview
Problem
In wireless communications, the mismatch between uplink and downlink bandwidth part indices during beam failure recovery and random access procedures leads to delays and inefficiencies.
Innovation Solution
A base station sends a reconfiguration message to set the active uplink and downlink bandwidth part indices to the same value before beam failure recovery or random access procedures, reducing switching delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless device performs BWP switching during beam failure recovery or random access procedure, then the uplink and downlink BWPs can be properly aligned, but this introduces additional switching delay
Solution Approach 1:
The base station proactively sends a reconfiguration message to pre-align the uplink and downlink BWP indices before the wireless device initiates beam failure recovery or random access procedure. This preliminary action ensures that when the recovery procedure starts, both uplink and downlink are already configured with matching BWP indices, eliminating the need for additional switching operations during the critical recovery phase.
2Loss of time
If the base station sends reconfiguration message to align BWP indices, then switching delay is reduced, but this increases signaling overhead
Solution Approach 1:
The reconfiguration message modifies specific BWP configuration parameters (uplink BWP index and downlink BWP index) to ensure they are set to the same value. By directly changing these parameters in advance, the system achieves BWP alignment without requiring multiple separate signaling exchanges or complex coordination procedures during the recovery process.
Data Source
AI summary
Uplink and downlink synchronization procedures are described for wireless communications. A base station may send a reconfiguration message to a wireless device before a random access procedure. The reconfiguration message may set an active uplink index and an active downlink index to the same value.