Uplink Transmission Switching With Multi-TAG Band Mapping
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) may fail to account for the increased length of the switching period when switching between bands associated with different timing advance groups (TAGs), leading to potential overlaps between scheduled transmissions and uplink transmission switches due to unawareness of the association between bands and TAGs.
Innovation Solution
The UE indicates support for multiple TAGs and transmits a set of bands with their corresponding TAGs to the network node, receiving a configuration for proper adjustment of the switching period during band transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE switches transmission channel between bands associated with different TAGs during a switching period, then uplink transmission flexibility is improved, but the switching period length increases causing potential overlap with scheduled transmissions
Solution Approach 1:
The network node performs preliminary configuration by providing TAG-to-band mapping information to the UE before transmission switching occurs. This allows the UE to advance-plan the switching period length based on the specific TAG associations of the source and target bands, preventing overlap with scheduled transmissions through proactive timing adjustment.
2Device complexity
If the UE is unaware of the increased switching period length when switching between different TAGs, then device complexity is reduced, but transmission reliability deteriorates due to potential overlap between scheduled transmissions and uplink switches
Solution Approach 1:
The network node acts as an intermediary by providing TAG-to-band mapping information to the UE. This intermediary configuration enables the UE to determine the appropriate switching period length without complex internal logic, while the network node maintains overall synchronization control. The mapping information serves as a mediator that bridges the gap between network coordination and UE execution.
3Adaptability or versatility
If the UE supports multiple TAGs with different timing advance values, then communication versatility across different bands is improved, but the complexity of managing switching periods between TAGs increases
Solution Approach 1:
The patent extracts the complexity of switching period calculation from the UE by providing pre-configured TAG-to-band mapping information from the network node. This separation allows the UE to support multiple TAGs with different timing advance values without implementing complex switching period management logic, as the mapping information enables straightforward determination of appropriate switching periods.
Data Source
AI summary
A method for wireless communication at a user equipment (UE) includes transmitting, to a network node, a first message indicating the UE supports multiple timing advance groups (TAGs). The method also includes transmitting, to the network node, a second message indicating a set of bands supported for uplink transmission switching, a total number of TAGs supported by the UE, and a relationship between each band of the set of bands and one TAG of a set of TAGs supported by the UE. A number of TAGs in the set of TAGs may be equal to or less than the total number of TAGs supported by the UE. The method further includes receiving, from the network node, a configuration based on transmitting the second message.