DAPS Handover Uplink Scheduling for PRACH and PUSCH Conflicts
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing dual active protocol stack based handovers (DAPS HO) operations, particularly in overlapping time intervals of uplink signals during type-2 random access procedures, leading to inefficiencies and increased latency.
Innovation Solution
A method and apparatus are provided to manage DAPS HO operations by configuring a type-2 random access procedure, where uplink signals are transmitted to the target master cell group (MCG) without overlapping with the source MCG, and prioritizing transmission power allocation based on preconfigured priorities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink signals are transmitted to both source MCG and target MCG in overlapping time intervals during type-2 random access procedure, then communication continuity is maintained, but transmission conflicts and latency increase
Solution Approach 1:
The patent segments the uplink transmission timeline by defining a first time interval for message A transmission to target MCG and a second time interval for other uplink signals to source MCG. By dividing the overlapping time resources into separate non-overlapping intervals, the patent eliminates transmission conflicts while maintaining continuous communication through sequential transmission of different signal types.
2Adaptability or versatility
If transmission power is allocated without preconfigured priorities, then power distribution is flexible, but transmission efficiency and reliability decrease
Solution Approach 1:
The patent applies preliminary action by preconfiguring transmission power priorities before the DAPS handover operation begins. The network device configures and notifies the UE of priority levels for different uplink signals (message A, PUCCH, PUSCH, SRS) in advance, enabling the UE to automatically perform optimized power allocation during handover without real-time negotiation, thus improving transmission efficiency while maintaining adaptability.
Data Source
AI summary
Disclosed are a method for transmitting and receiving signals in a wireless communication system, and an apparatus supporting the method, wherein dual active protocol stack-based handover (DAPS HO) operation is carried out, and, on the basis of transmission, to a target master cell group, of a message comprising a physical random access channel (PRACH) and a physical uplink shared channel (PUSCH), an uplink signal different from the message is not transmitted to a source MCG in a first time period that overlaps with a second time period in which PRACH and PUSCH were transmitted.