Bandwidth Part Activation in DAPS Handover with Supplementary Uplink
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Solution Overview
Problem
Current wireless communication systems face challenges in seamless bandwidth part activation during dual active protocol stack handovers, particularly with supplementary uplinks, leading to potential service interruptions and increased latency due to unclear active uplink bandwidth configurations.
Innovation Solution
The method involves a user equipment (UE) indicating support for dual active protocol stack handovers, transmitting on both normal and supplementary uplinks in active bandwidth parts, and establishing an active uplink bandwidth on a target cell that is within the active bandwidth for either the normal or supplementary uplink carrier, based on configuration or co-channel determinations, to ensure continuous and efficient handover processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual active protocol stack handover is implemented with supplementary uplink, then handover continuity is improved, but bandwidth part activation clarity deteriorates
Solution Approach 1:
The patent segments the uplink transmission into two distinct carriers: normal uplink (NUL) and supplementary uplink (SUL). Each carrier has its own active bandwidth part configuration. This segmentation allows the system to maintain both NUL and SUL transmissions simultaneously during handover, with clear identification of which bandwidth part is active on each carrier, thereby resolving the ambiguity while preserving handover continuity.
Solution Approach 2:
The patent applies local quality by configuring different bandwidth part parameters specifically for SUL carrier rather than using generic uplink configurations. The active bandwidth part for SUL is determined based on local conditions (scheduling decisions, channel status) specific to the supplementary uplink, allowing optimized and unambiguous bandwidth activation for each carrier type independently.
2Adaptability or versatility
If carrier switching is performed during handover, then uplink transmission flexibility is improved, but processing time and latency increase
Solution Approach 1:
The patent performs preliminary action by pre-configuring multiple active bandwidth parts for both NUL and SUL carriers before handover occurs. The UE is provided with configuration information that includes bandwidth part indicators for both carriers in advance. During handover, the UE can immediately switch between these pre-configured bandwidth parts without requiring time-consuming reconfiguration or carrier switching procedures, thus reducing latency while maintaining flexibility.
3Reliability
If multiple uplink carriers are transmitted simultaneously, then transmission reliability is improved, but signaling resource consumption increases
Solution Approach 1:
The patent applies universality by creating a unified bandwidth part configuration framework that simultaneously manages both NUL and SUL carriers. A single set of configuration parameters and bandwidth part indicators serves both carrier types, allowing the system to transmit on multiple carriers while using a common signaling structure. This multi-functional approach enables simultaneous NUL and SUL transmissions without proportionally increasing signaling overhead, as the same configuration mechanisms apply to both carriers.
Data Source
AI summary
This disclosure provides systems, methods, and apparatuses for a user equipment (UE) to activate a bandwidth part (BWP) during a dual active protocol stack (DAPS) handover with a supplementary uplink (SUL). In one aspect, a base station may receive an indication that the UE supports DAPS handover. The base station may transmit a configuration or an instruction that indicates an active BWP for the UE to use for a target cell or target master cell group (MCG). In another aspect, the UE may transmit on a normal uplink (NUL) in an active BWP for a NUL carrier and transmit on a SUL in an active BWP for a SUL carrier. The UE may establish, in association with a DAPS handover being triggered, an active UL BWP that is within an active UL BWP for the NUL carrier or an active UL BWP for the SUL carrier.