Bandwidth Part and NCD-SSB Scheduling Without UE RF Retuning
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in configuring bandwidth parts (BWPs) and synchronization signal blocks (SSBs) for reduced capability UEs, leading to increased control resource overhead, inter-cell interference, and throughput loss due to RF retuning for monitoring CD-SSBs outside the operating bandwidth.
Innovation Solution
Dynamic scheduling of non-cell-defining SSBs (NCD-SSBs) within the operating bandwidth of UEs, enabled by control signaling such as DCI or MAC-CE, allowing UEs to skip RF retuning and monitor NCD-SSBs without leaving their operating bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs monitor CD-SSBs outside their operating bandwidth, then synchronization and system information acquisition are achieved, but RF retuning is required causing throughput loss and increased complexity
Solution Approach 1:
The patent segments the SSB monitoring function by introducing a second SSB within the UE's operating bandwidth that provides the same synchronization and system information as the original CD-SSB outside the bandwidth. This allows the UE to monitor the second SSB without leaving its operating bandwidth, eliminating RF retuning and maintaining throughput while achieving synchronization.
Solution Approach 2:
The patent introduces a second SSB as an intermediary element that mediates between the UE's operating bandwidth constraints and the need for system information acquisition. The second SSB acts as a local proxy for the CD-SSB, allowing UEs to obtain necessary synchronization information without accessing frequencies outside their operating bandwidth.
2Use of energy by moving object
If UEs operate in reduced capability mode with narrower bandwidth, then power consumption is reduced, but control resource overhead and inter-cell interference increase
Solution Approach 1:
The patent applies local quality by configuring the second SSB specifically within the operating bandwidth of reduced capability UEs, while the original CD-SSB remains outside. This localized approach allows reduced capability UEs to operate efficiently in their narrower bandwidth without causing or experiencing interference from other cells monitoring the same out-of-band resources.
Solution Approach 2:
The patent enables dynamic operation where UEs can switch between monitoring the CD-SSB outside operating bandwidth and the second SSB within operating bandwidth based on their capability mode. This dynamic configuration allows the system to adapt resource allocation and SSB positioning according to UE capabilities, reducing overall control overhead and interference.
3Reliability
If UEs perform RF retuning to monitor CD-SSBs, then synchronization is maintained, but time is lost and throughput is reduced
Solution Approach 1:
The patent implements preliminary action by pre-configuring the second SSB within the UE's operating bandwidth before the UE needs to perform synchronization. The second SSB is positioned and configured in advance, allowing reduced capability UEs to immediately monitor it without needing to perform time-consuming RF retuning operations, thus maintaining synchronization without time loss.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A synchronization signal block (SSB) may be dynamically scheduled within an operating bandwidth of a user equipment (UE), where the operating bandwidth of the UE is outside of a frequency resource in which a cell defining SSB (CD-SSB) is scheduled. For example, a UE may operate in a reduced capability mode or an enhanced reduced capability mode where the UE may operate in a narrower bandwidth than the serving cell bandwidth. Control signaling may dynamically configure an SSB for the UE within the operating bandwidth of the UE. The UE may monitor for the non-cell defining SSB (NCD-SSB) and skip monitoring for the CD-SSB based on the dynamically configured NCD-SSB. For example, a reduced capability UE or an enhanced reduced capability UE may monitor for the NCD-SSB without performing RF retuning between receiving the control signaling and monitoring for the NCD-SSB.