Location Beacon Deployment Plan
This article describes best practices for optimizing blue dot location accuracy on maps in your Meridian-powered app. It begins with an overview of Beacon placement models and deployment best practices. The next section builds upon these best practices and provides a step-by-step process for creating and effecting a Location Beacon deployment plan.
As the user’s mobile device moves through a location with a Beacon deployment, the Meridian-powered app will hear the Beacon's Bluetooth signals and continually update the user's blue dot location on a map. Meridian-powered apps will display a blue dot location if the device can hear Bluetooth signals from nearby Beacons, with the accuracy improving as more Beacons are heard. If the app can hear three or more Beacons, it will use the Beacons nearest to the blue dot to calculate the current location. The Beacons used to calculate the user's location will continually change as the user moves around a location and the device hears different Beacons.
When developing a Location Beacon deployment plan, the most important factor is the accuracy and responsiveness of the blue dot. The goal of the Location Beacon deployment plan is to help you deploy your Beacons to get the most accurate blue dot accuracy throughout your location.
In a Meridian-powered app, the blue dot accuracy is highly dependent on the quality of the Beacon placement. Because of this, Beacon placement needs to take into account architectural features, such as walls, floor plan layout, staircases, multi-level floors (such as atriums), and more. Even things like fountains and indoor foliage can distort the Beacon Bluetooth signals that the app relies on to generate an accurate blue dot.
Given the incredible variety in architectural layouts, the same Beacon deployment model may not work for every location or even for different spots within a location. The layout of your floor plan will determine the type of deployment you'll need to use. Beacon placement can be generalized into two basic placement models:
- Path Model: Use this for hallways or corridors.
- Area Model: Use this for large open areas.
We recommend testing and refining your Beacon placement until the blue dot accuracy meets your expectations.
As the blue moves down the hallway or corridor, it's only important to show how far along the hallway it is. In general, users aren't too concerned with how close the blue dot is to the wall on either side.
For best results, if ceiling mounting is possible, place the actual Beacons directly down the center of the hallway on the ceiling. If ceiling mounting isn't possible, attach the actual Beacons to the wall, but in the Beacons app, place the Beacons in the middle of the hallway. The app will show the blue dot moving in a straight line on the map regardless of the device's actual position.
Figure 1: Path Model. User position shown on Meridian map when two Beacons are nearby.
Figure 2: Path Model, with AP-mounted beacons. Consider using AP-mounted beacons for location services only if they exist on path.
Unlike the Path Model, the Area Model Beacon placement is use to track user's as they move in any direction on a map. To do this in even the smallest area, you'll need at least three Beacons to accurately trilaterate the device's location.
The larger the open area space, the more Location Beacons you'll need to deploy in a grid-like fashion, as you can see in Figure 3. For best results, Beacons should be placed on the ceiling no more than 10 meters apart.
Figure 3: Area Model. User position shown on Meridian map when three Beacons are nearby.
The following factors should be considered when determining the placement of Beacons to ensure the performance required by your deployment.
For a location accuracy of 3-5 meters (approx. 6-15 feet) and latency of 3-5 seconds, make sure that Beacons are placed no more than 10 meters (approx. 30 feet) apart. Closer Beacon placement provides the best indoor positioning experience by improving accuracy and reducing blue dot jumpiness.
The best distance between placed Beacons may vary based on factors such as the deployment model, variations in ceiling height, reflective vs. non- reflective environments, etc.
The 10 meter Beacon distance is a guideline and your actual deployment may need to differ. Experimentation with subtle changes to Beacon placement is often necessary before the optimal placement is found.
Battery-powered Beacons are small enough to be mounted in many different places using a variety of techniques and options. It's most common to mount battery-powered Beacons on walls and ceilings.
There are three mounting options are available for battery-powered Beacons:
- Adhesive on the back of the Beacon
- Indoor mounting bracket (useful for replacing Beacons in the future)
- Outdoor mounting enclosure
The mounting brackets not only make replacing Beacons easier, but they're also quicker to install since the brackets come with a single piece of adhesive, versus the 4 small pieces used for a standalone beacon (that is, peeling 1 vs. 4 stickers is faster). You can read more about the mounting options here.
|Aruba Part Number||HPE Part Number||Description|
|LS-BT1-MNT-50||JW145A||Indoor mounting bracket for battery powered Aruba Beacon - pack of 50 brackets|
|LS-BT1-NEMA||JW144A||Outdoor mounting bracket for battery powered Aruba Beacon and Aruba Tag|
The options and techniques used in your deployment will depend on the factors described in the following sections.
Wall mounting can be used in open-roof areas or areas with very high ceilings where installation might be a challenge. Wall mounting is easier than ceiling mounting and you can use all three mounting options. Even though though Beacons are small and unobtrusive, they are more visible when mounted on the wall.
Ceiling mounting is ideal for environments with aesthetic concerns, because it allows Beacons to be installed discreetly and out of line-of-sight. Ceiling mounting also keeps Beacons out of reach from curious people and prevents tampering or theft. Additionally, because crowds of human beings can attenuate the Bluetooth Beacon signals, ceiling mounting provides more resilience to that.
Keep the following in mind when installing ceiling-mounted Beacons:
- Make sure Beacons are mounted away from the heat generated by light bulbs.
- Beacons must be mounted below ceiling tiles, because some types of tiles may impair Beacon signals.
- For environments with different ceiling heights, make sure Beacons are placed on the lower ceiling height to prevent the blocking of Beacon signals from different locations.
- Ceiling mounting may require a personnel lift, mounting stick, or ladder. Take proper safety precautions when climbing to place Beacons.
Reflective environments, such as areas with marble floors, may result in an increase in blue dot jumpiness. Carpeted areas have shown better blue dot stability than areas with marble floors. In locations where reflective surfaces are unavoidable, consider using the path model instead of the area model.
Open Multi-Level Environments
"Open multi-level environments" refers to open indoor areas that extend through multiple floors.
Some examples are:
- An open atrium or lobby on the first floor that is open to the floors above.
- A stadium or auditorium with multiple seating levels .
- A shopping center or large venue with multiple floors that opens into a common area on a different floor.
For open multi-level environments, the user will have a more stable blue dot experience if Beacons are placed low or close to the ground. It’s best to avoid direct line of sight to Beacons on different floors.
Examples of where to place Beacons in this environment are:
- Under seats. This helps to attenuate Beacon signals to reduce the amount of interference with other Beacon signals.
- Below handrails. This localizes Beacon signals.
- Face the front of the Beacon away from the open area. This will reduce Beacon signals going into the open space. The front of the Beacon is the side with the Aruba logo.
In summary, to minimize the signal bleed through open areas, place the Beacons low and direct the front of the Beacon away from the open area.
Create Your Location Deployment Plan
This section describes the steps you'll need to take to create and implement a Location Beacon deployment plan.
Before you can do this, you'll need at least one map in the Meridian Editor. If you don't have a Meridian map, please read about how to start that process. You'll also need to download the iOS Aruba Beacons app.
The steps are:
- In the Meridian Editor, add routing to your maps.
- Identify paths and areas.
- Deploy Beacons in hallways.
- Deploy Beacons in open areas.
Step 1. Add Routing to Your Maps
Once you have a Meridian map, you'll start by adding routing to your maps in the Meridian Editor. The routing represents all the possible paths that your users can walk to get from one point to the next. To do this, go to the Meridian Editor, navigate to the specific map, and add the routing for each of your maps.
Here's an example of what some finished routing might look like:
FIGURE 1: Each node in the routing represents a point at which the Meridian-powered app's turn-by-turn directions will give your users a new direction.
Step 2. Identify Paths and Areas
After the routes are created, review the map and identify the hallways (paths) and open spaces (areas).
FIGURE 2: Identify the paths and areas where the blue dot will be displayed.
Before moving on to the next steps, you’ll need to evaluate what's already been deployed in the current environment. In a facility where there are no Aruba access points (AP) deployed, you can start deploying Beacons. (We recommend a Beacon placement density of no more than 10 meters.)
If Aruba APs with Bluetooth low-energy (BLE) Beacons have already been deployed, you’ll need to take those into consideration so you can use what's already available. If you haven't done so, you’ll need to enable the BLEs in those APs and configure them to
beaconing. If the APs are already beaconing, you’ll see the beacon MAC address when using the Beacons app to scan for Beacons.
Here's an example of a location with already deployed access point Beacons (APB).
FIGURE 3: You won't need to deploy battery-powered Beacons in places where there are already existing APBs.
Step 3. Deploy Beacons in Hallways
In hallways, the user will be moving in a straight line, so you'll deploy Beacons using the path model.
You can place the physical Beacons either on the ceiling or, if that's not possible, the wall. Because the blue dot will gravitate towards all nearby Beacons, take care not to configure Beacons on the other side of walls along the hallways people will be walking. Using a Beacon that is off the path may result in a blue dot that zigzags while a user is walking or shows the user in an area that is separated by physical obstructions, such as a wall.
Single Level Hallway
In the example below, APBs and battery-powered Beacons are used to complete the path model.
FIGURE 4: An example of how Location Beacons should be deployed along hallways.
If possible, place Beacons on the ceiling. If that's not possible, place Beacons on the same side of the hallway at the same height in a straight line.
Only use APBs for the placement model if it's appropriate to do so. If there are APBs near the hallway in a room, separated by a wall, don't use it as a location Beacon. Set it to proximity. It can still be used for Beacons Management, but won't degrade the blue dot accuracy.
High Ceiling or Multi-Level Hallway
Not all hallways will be on a single floor or will have obvious locations to place Beacons. In Figure 5, the hallway is open to the floor above, which makes it difficult place Beacons in the middle of the hallway, such as the ceiling. Although the hallway is wide, a path model deployment will work, because what's important is showing where the user is along the hallway.
FIGURE 5: An alternate use case for path model to deliver expected blue dot behavior.
Initially the deployment team placed the Beacons in a staggered pattern down the hall and configured the Beacons to be as close as possible to the actual Beacon placement. This resulted in the blue dot moving from side to side as the user walked down the middle of the hallway. To fix this, the Beacons were taken down and placed along the right side of the hall, but in the Beacons app the Beacons were placed closer to the center of the hallway. This way the blue dot will show the user is in the middle of the hallway instead of being next to a wall.
Step 4. Deploy Beacons in Open Areas
Use the area placement model in open areas, because your visitors will have more space to move around without a physical barrier, such as a wall, to obstruct their movement.
Single Level Open Area
While the path model employs only two Beacons and tracks movement along one dimension, the area model uses three Beacons to track the user along two dimensions. Since there are no walls to be concerned with, it's ok to have the blue dot move more freely within the space.
FIGURE 6: Deploy Beacons using the area model.
Remember to configure existing APBs as location Beacons only if the Beacon applies to the use case in the area. If a nearby APB is available but doesn't fit the deployment model, configure it as a proximity instead of a location Beacon. This way the APB can still be used for Beacons Management and does not degrade the blue dot accuracy.
Figure 7 shows the final result after all the Beacons have been deployed to meet the blue dot requirements for both path and area models. Keep in mind: configure Beacons for location if it satisfies the use case, otherwise configure it for proximity so that it can still be used for Beacons Management.
FIGURE 7: The end result after applying Beacon deployment techniques.
Multi-level Open Area
Multi-level open areas are a special case that can be an especially tricky spot to deploy Beacons. Examples include things like open lobby with elevated pathways above or an open stadium field with elevated seating all around.
Multi-floor Open Atrium
One of the most challenging situations is an open area that is open to floors above.
The problem with this layout is floor hopping. Floor hopping is a behavior where, for example, the blue dot will show the user on Level 2, when they're physically on level 1. This happens if the mobile device has a direct line of sight or is able to hear a Beacon from the other floors.
FIGURE 8: Open area that is open to floors above is susceptible to floor hopping.
Use the following techniques to avoid floor hopping in multi-level open areas:
- Place the Beacon with the front facing away from the open area.
- Face the Beacons into the hallway or inner open area.
- Use physical barriers to attenuate Beacon signals.
FIGURE 9: To minimize floor hopping on the main floor, place Beacons facing downwards or under furniture. On upper floors, use physical barriers to attenuate signal and reduce line of sight to the open area.
FIGURE 10: Example of Beacon placements for all levels susceptible to floor hopping.
Specific Architectural Features
This section addresses common issues when dealing with specific architectural features.
Stadiums have been the most challenging venue when it comes to Beacon placement. The factors that have impacted Beacon deployments are:
- wide-open area with direct line of sight to multiple levels.
- limited locations for Beacons placement.
- strict aesthetic requirements.
FIGURE 11: A stadium has wide-open areas with direct line of sight to multiple levels. Minimize Beacon signal bleed through and line of sight to avoid floor hopping.
Even with all these challenges, the same techniques for avoiding floor hopping still apply.
Here are some lessons learned from a deployment at a football stadium.
FIGURE 12: The minimized line of sight caused signal to bleed to the level above resulting in floor hopping.
FIGURE 13: Beacons place in direct line of sight to elevated walkways will cause the blue dot to floor hop.
Beacons aren't usually placed in stairways, but stairwells may be an exception. Stairwells can often be an extension of the map level, but are often cut off by a set of doors. Placing a location Beacon in the stairwell by the door may be useful to reduce the app's map transition time.
For example, a user enters the stairwell on level 1 and climbs the stairs to level 2. As the user approaches the entry way to level 2, the map will load and by the time the user is in the hallway of level 2, the map will be ready for use.
FIGURE 14: Beacons placed in stairwells helps to reduce map transition delays.
Don't place location Beacons inside elevators. Each Beacon can only be associated with a single map level.
For example, let’s say the Beacon is placed on the level 1 map and the physical beacon is placed inside the elevator. If the user on level 7 is using turn-by-turn directions to a room on level 5, when the user enters the elevator, the map will transition to level 1 and instruct the user to take the elevator up to level 5, instead of down to level 5.
Location Beacons can only have a one-to-one association with maps; therefore, don't place them in elevators.
Indoor to Outdoor Transitions
In some cases, customers require navigation across a campus that includes navigation outdoors. Meridian addresses this use case by transitioning a user from indoor navigation, using Bluetooth Beacons, to outdoor navigation, using GPS. In both cases, Meridian maps are utilized, and of course, all maps must be in the Meridian Editor. A blue dot is shown on the Meridian map when Beacons are used for location. A green dot is shown when GPS is used for location.
For now, this section will only cover beacon placement techniques to ensure a smooth transition from blue dot to green dot.
Only configure a map to use GPS if GPS is possible, otherwise you won't get a green dot on the map. Third party maps, such as Google Maps, can't be used with Meridian location services.
The same techniques used for indoor to outdoor are the same as those used for multi-level open areas: minimize signal bleed and eliminate line of sight.
FIGURE 15: At the building exits, minimize signal bleed and line of sight to outside by placing the Beacons inside the doorway, facing into the building.