CBRS Capacity Management During CBSD Power-Down Handover

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Solution Overview

Problem

The introduction of a new Citizens Broadband Radio Service Device (CBSD) in a CBRS network leads to power down commands for existing CBSDs, causing disruptions and service degradation due to reduced transmission range and capacity, which can result in dropped sessions, packet loss, and the need for re-establishment of communications.

Innovation Solution

Existing CBSDs manage UE load and adjust transmission power by decreasing inactivity timers for UEs near the cell center, establishing X2 connections with new CBSDs, and coordinating multipoint transmissions to ensure seamless handoffs and completion of ongoing sessions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a new CBSD is activated in the network, then network capacity and coverage are improved, but interference to existing CBSDs increases causing service degradation

Engineering Contradiction:

Improvenetwork capacityVSAvoidservice quality

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system performs preliminary actions by decreasing UE inactivity timers and pre-transmitting packets in buffers before the power down command takes full effect. This allows ongoing sessions to be completed or handed off smoothly, preventing service degradation when the new CBSD is activated and causes interference to existing CBSDs.

Inventive Principle:

Principle #10Preliminary action

2Object-affected harmful factors

If transmit power of existing CBSDs is reduced to decrease interference, then electromagnetic interference to new CBSD is decreased, but data capacity and transmission range of existing CBSDs are reduced

Engineering Contradiction:

Improveelectromagnetic interferenceVSAvoiddata capacity

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

Before reducing transmit power to decrease electromagnetic interference, the system performs preliminary actions by transmitting packets already in buffers and decreasing inactivity timers. This ensures that data capacity is maintained during the transition period, allowing existing CBSDs to complete ongoing sessions at higher power before the power reduction takes effect.

Inventive Principle:

Principle #10Preliminary action

3Object-affected harmful factors

If power down command is implemented to manage interference, then electromagnetic interference is reduced, but number of UEs that can be supported by existing CBSD is reduced

Engineering Contradiction:

Improveelectromagnetic interferenceVSAvoidnumber of UEs supported

Core Design Contradiction:

Object-affected harmful factorsVSQuantity of substance

Solution Approach 1:

The system performs preliminary actions by pre-transmitting packets and decreasing UE inactivity timers before implementing the power down command. This allows more UEs to maintain connectivity during the transition, as ongoing sessions are completed or handed off before the power reduction limits the number of supportable UEs.

Inventive Principle:

Principle #10Preliminary action

4Object-affected harmful factors

If CBSD powers down to reduce interference, then electromagnetic interference to new CBSD is decreased, but ongoing communications sessions are disrupted

Engineering Contradiction:

Improveelectromagnetic interferenceVSAvoidsession continuity

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The system performs preliminary actions by transmitting packets already in buffers and decreasing UE inactivity timers before the power down command takes effect. This allows ongoing communications sessions to be completed or smoothly handed off to other CBSDs, maintaining session continuity even as the CBSD powers down to reduce electromagnetic interference.

Inventive Principle:

Principle #10Preliminary action

5Productivity

If inactivity timer is decreased for UEs, then UEs are moved to idle state faster freeing up resources, but time for packet transmission is reduced

Engineering Contradiction:

Improveresource availabilityVSAvoidpacket transmission time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The system performs preliminary actions by pre-transmitting packets in buffers before decreasing the inactivity timer. This ensures that packet transmission is completed before UEs are moved to idle state, thereby avoiding packet loss while still achieving the goal of freeing up resources for new connections.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12581426B2Capacity management methods and apparatus for use in a wireless network

Publication Date: 2026.03.17 CHARTER COMM OPERATING LLC

AI summary

Methods and apparatus for managing capacity in a Citizens Broadband Radio Service (CBRS) network. An exemplary method embodiment includes operating a Citizens Broadband Radio Service Device (CBSD) of a cell to perform the steps of: receiving a power down message; decreasing, in response to the power down message, UE inactivity timer length for one or more UEs from a first length to a second length; and continuing to transmit packets to UEs at an edge of the cell. An exemplary system embodiment includes: a CBSD of a cell that comprises: a network receiver that receives a power down message; a first processor that controls the first CBSD to decrease, in response to the power down message, UE inactivity timer length for one or more UEs from a first length to a second length; and a wireless transmitter that continues to transmit packets to UEs at an edge of the cell.