Hello Expert.
What are main reasons to increase DL ACTIVE UE in network?
2 degree uptilt is main reason 
Well, it depends on the situation.
It’s important to note that increasing the number of DL active UEs should be balanced with other network optimization considerations, such as power consumption, interference management, and resource allocation, to ensure the overall efficiency and performance of the network.
Thus if DL active users not allowed for more Network traffic, it might cause vice versa and impact negatively on UE THR.
So you need to check cluster wise it degrade UE THR with stable traffic (you should optimize the cell paratmer to cope UE allocated on edge cell) or it lead to more traffic enhanced which is fine (in this case the network was not tuned properly and now can load much better).
1a) Keeping UE more in wanted carrier/band or not keeping UE in unwanted carrier/band by connected mode or idle mode settings.
For example very aggressive U2L PS Redirection settings playing by U2LServTrigSource/U2LServTrigSource/HO_U2L_CONN_PRIO_SWITCH/NPriorityConnect/Npriority/UU2LTEHONCOV: TargetRatThdRSRP/UCELLU2LTEHONCOV: TargetRatThdRSRP/U2LPunishTimer/U2LServMcTimeOutPunishTime/U2LNCovPSCmUserNumThd to shift UE from 3g to LTe etc mobility settings.
1b) For LTE more mentioned power settings or improper highest power values of pA/pB/RSPwr/pcfichpwr/pbchpwr/schpwr/dbchpwr/pchpwr/rarsppwr/prspwr/DediDciPwrOffset (x0.1)/PwrOffset (x0.1)
1c) More strong power of serving carriers coverage
1d) Event ( concert / football etc event.
1e) Improper intra/inter/interrat mobility settings keeping UE on highest utilizied carriers/bands.
1f) Over %70 CPU Load on DPU/GPU board to do not allow sufficient paging to UE relocate among carriers ( very low probability )
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Increased Data Consumption: Video Streaming: Higher usage of video streaming services like YouTube, Netflix, and other platforms significantly increases downlink data traffic.
Social Media: More time spent on social media apps, which are data-intensive, especially with features like live streaming, video calls, and high-resolution media sharing.
Growth in User Base: -
Subscriber Growth: More subscribers joining the network due to marketing efforts, improved services, or population growth.
Device Proliferation: Increased number of devices per user, such as smartphones, tablets, and other IoT devices, all consuming data simultaneously.
Technological Advancements: -
Higher Throughput Devices: Newer devices support higher data rates, leading to more data consumption.
Network Upgrades: Deployment of advanced technologies like LTE-Advanced, 5G, and massive MIMO that support higher data rates and more simultaneous connections.
Application Growth: -
New Applications and Services: Emergence of new applications and services that require substantial data downloads, such as augmented reality (AR), virtual reality (VR), and large software updates.
Cloud Services: Increased use of cloud-based services and applications which rely on continuous downlink data transfer.
Content Delivery Optimization: -
Content Caching: Deployment of content delivery networks (CDNs) closer to end-users to optimize and increase the downlink traffic.
Rich Media Content: Higher quality of content being delivered, such as 4K videos and high-resolution images.
Network Policies and Tariffs: -
Unlimited Data Plans: Introduction of unlimited data plans encourages users to consume more data without worrying about overage charges.
Promotional Offers: Promotions and data bundles that encourage higher data usage.
Enhanced User Experience: -
Low Latency and High Reliability: Improved network performance in terms of low latency and high reliability makes it easier and more enjoyable for users to engage in data-intensive activities.
Network Expansion: Increased network coverage and capacity through the deployment of additional cell sites and spectrum.
These factors collectively contribute to a higher number of DL Active UEs in the network, reflecting both the growth in user base and the increased data consumption per user.
+ low paging SR issues
+ interference of target cells during mobility or due to interference or PCI conflict UE could not camp on target cells due to rach SR issues or paging or due to interference etc.
+ Due to PCI conflict UE could not perform sufficient handover etc.
So you must be sure UE generally increased on which carriers.
If it is same for the all carriers you must check main KPIs (rach, mobility, accessibility) and step by step try to understand reason.
If just only single carriers you must double check nearby cells UE Num state and check these parameters / or mentinoned KPIs on the above and you can understand and for solutions you can do what you need.
The main reasons to increase the number of Downlink (DL) Active User Equipment (UE) in a network typically include:
Network Capacity Optimization:
Increasing the DL Active UEs ensures that the network is being utilized efficiently. Higher active users can indicate better use of available bandwidth and resources.
Enhanced User Experience:
By increasing the number of DL Active UEs, the network can support more concurrent users, which improves overall user satisfaction and experience. This is particularly important during peak usage times or in high-density areas.
Load Balancing:
Distributing the load evenly across the network helps in managing network congestion and maintaining performance. Increasing DL Active UEs can aid in better load balancing across various cells or sectors.
Improved Coverage:
Enhancing the number of active UEs can help in extending the coverage area. More active connections ensure that users at the edge of the cell still receive adequate service.
Technological Advancements:
With advancements in technology, such as 5G, the network can handle a larger number of active users simultaneously. Deploying these technologies can naturally lead to an increase in DL Active UEs.
Marketing and Revenue:
Increasing the capacity to handle more active users can attract more customers, which in turn can increase revenue for network operators. It also provides a competitive edge in the market.
Quality of Service (QoS) Improvements:
To maintain or improve QoS, operators might increase DL Active UEs by optimizing resources, deploying new hardware, or enhancing software capabilities.
IoT and M2M Communications:
The proliferation of Internet of Things (IoT) and Machine-to-Machine (M2M) communications leads to a natural increase in DL Active UEs as more devices require network connectivity.
Network Upgrades:
Periodic network upgrades and expansions often lead to an increase in the number of DL Active UEs that the network can support. This includes upgrading base stations, deploying small cells, and enhancing backhaul capacity.
User Behavior Changes:
Changes in user behavior, such as increased data consumption, use of bandwidth-intensive applications (like video streaming), and the rise in mobile internet use, necessitate support for more active UEs.
I remember that there are parameters for RSRP/RSRQ level limits accept for UE.
But you should not change it these levels because operators set it as a default.
Or someone turned down a neighbor site 