Cell Reselection Control for On-Demand SIB1 Deployments
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Solution Overview
Problem
Existing wireless communications systems face resource overhead due to periodic system information block type-1 (SIB1) transmissions, especially in low-traffic environments, and some UEs are unable to synchronize or communicate with on-demand SIB1 cells, leading to resource wastage.
Innovation Solution
Implementing control signaling to exclude on-demand SIB1 cells or use reserved values, new sync rasters, and separate mobility parameters to prevent certain UEs from accessing these cells, while configuring others to utilize them, thereby reducing overhead and optimizing cell reselection procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic SIB1 transmissions are implemented, then network coverage and UE synchronization are improved, but resource overhead and power consumption increase
Solution Approach 1:
The patent implements on-demand SIB1 transmissions triggered by wake-up signals instead of continuous periodic transmissions. The network entity receives a wake-up signal from the UE and then transmits SIB1 only when needed, reducing resource overhead while maintaining synchronization capability. This transforms the periodic action into an event-driven action that preserves reliability while reducing energy loss.
2Loss of energy
If on-demand SIB1 cells are deployed, then resource overhead is reduced, but incompatible UEs cannot synchronize or communicate with these cells
Solution Approach 1:
The patent applies different cell configuration qualities to different UE types. On-demand SIB1 cells are configured with specific properties (such as reserved values in SIB1 or excluded cell list indicators) that make them identifiable and selectable by compatible UEs while being excluded or unrecognized by incompatible legacy UEs. This local differentiation in cell quality enables compatibility management without sacrificing the resource efficiency benefits.
Solution Approach 2:
The patent segments the cell population into on-demand SIB1 cells and legacy cells based on their transmission characteristics. By segmenting cells and applying different SIB1 transmission modes to different segments, the system allows compatible UEs to utilize on-demand cells for reduced overhead while incompatible UEs can still access legacy cells with periodic transmissions, thus maintaining overall system versatility.
3Loss of energy
If control signaling is used to exclude on-demand SIB1 cells from certain UEs, then resource wastage is reduced, but device complexity increases
Solution Approach 1:
The patent uses existing control signaling mechanisms (such as excluded cell list indicators or reserved value interpretations in SIB1) to convey on-demand cell information to UEs. By reusing and adapting existing signaling structures rather than creating entirely new signaling protocols, the patent reduces resource wastage through on-demand transmissions while minimizing the increase in device complexity. The control signaling leverages familiar UE processing paths.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. For example, a user equipment (UE) may receive, via a first cell, control signaling indicative of whether a set of one or more second cells configured for on-demand system information block transmissions is to be evaluated by the UE in association with a cell-reselection procedure. The UE may perform the cell-reselection procedure associated with a second cell of the set of one or more second cells, or a third cell configured for periodic system information block transmissions in accordance with the control signaling.