Low-band Node Mediates Uplink Grants for Mid-band CBSD
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Solution Overview
Problem
User equipment (UE) attached to a mid-band Citizens Broadband Radio Service Device (CBSD) node experiences disruptions in data transmission due to loss of Physical Downlink Control Channel (PDCCH) coverage, leading to failure in receiving uplink grant schedule updates, which affects seamless network service delivery.
Innovation Solution
The UE attaches to a low-band node, which retrieves updated uplink grant schedules from the CBSD node via a backhaul network using the physical cell ID (PCI) of the CBSD node, and forwards these schedules to the UE, enabling continued data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE relies on PDCCH coverage from mid-band CBSD node for uplink grant schedules, then network service quality is maintained, but service disruption occurs when PDCCH coverage is lost
Solution Approach 1:
The patent introduces a low-band node as an intermediary that mediates between the UE and the mid-band CBSD node. When PDCCH coverage is lost, the low-band node receives the UE's data transmission requests, retrieves updated uplink grant schedules from the CBSD node via backhaul network, and forwards them to the UE, thereby maintaining service continuity without requiring direct PDCCH coverage from the original node
Solution Approach 2:
The patent segments the network function into two parts: the mid-band CBSD node handles high-throughput data transmission, while the low-band node handles control signaling and grant schedule delivery. This segmentation allows the UE to maintain control plane connectivity through the low-band node even when the mid-band node's PDCCH coverage is lost, resolving the contradiction between service quality and coverage resilience
2Duration of action of stationary object
If UE switches to low-band node for continued transmission, then service continuity is maintained, but transmission speed decreases
Solution Approach 1:
The patent implements a dynamic transmission mode where the UE can switch between low-band and mid-band nodes based on PDCCH coverage availability. When PDCCH coverage is restored, the UE automatically switches back to the mid-band node for high-speed transmission. This dynamic adaptation allows the system to maintain service continuity at lower speeds when necessary while preserving the capability for high-speed transmission when conditions permit
3Adaptability or versatility
If CBSD node reduces transmit power for GAA compliance, then spectrum sharing requirements are met, but PDCCH coverage area shrinks
Solution Approach 1:
The low-band node serves as a mediator that compensates for the reduced PDCCH coverage area of the mid-band CBSD node. By handling control signaling and grant schedule delivery through the low-band node's larger coverage area, the system enables the mid-band CBSD node to operate at reduced power levels for GAA compliance without sacrificing coverage reliability
Data Source
AI summary
Various embodiments comprise systems, methods, and apparatus for enabling UE attached to a mobile network via a mid-band CBSD node to continue transmitting upload data to the mid-band CBSD node even in the event of a loss of Physical Downlink Control Channels (PDCCH) coverage of the CBSD node resulting in a failure of the UE to receive uplink grant schedule updates. Various embodiments contemplate that the UE responsively attaches to a low-band node which, based on physical cell ID (PCI) of the CBSD node, retrieves updated uplink grant schedules from the CBSD node via a backhaul network and provides the uplink grant schedules to the UE.