Wi-Fi® 연결을 통한 정확한 실내 위치 확인
위치 확인은 모빌리티와 밀접하게 연관되어 있습니다. 소비자들은 실내, 실외 어디서든 자신의 위치와 주변 정보를 확인하고 싶어 합니다. Wi-Fi CERTIFIED Location™은 미터 단위의 정확한 실내 위치 정보를 제공합니다. Wi-Fi Location 기능을 사용하는 네트워크와 기기들이 연동되어 Wi-Fi 연결과 함께 정확한 위치 정보를 제공할 수 있습니다. 별도의 위치 기반 인프라나 값비싼 유지보수는 필요 없습니다.
Wi-Fi Location 지원 기기는 네트워크 관리자, 운영시스템 개발자, 애프리케이션 개발자가 향상된 위치 정보 기반 앱과 서비스를 제공하도록 지원합니다. Wi-Fi Location 인증은 기기들 간의 표준기반 상호운용성을 보장합니다. 따라서 개발자는 사용자에게 실외와 동일한 수준의 경험을 실내에서도 제공할 수 있습니다.
내비게이션 이상의 로케이션 서비스
Wi-Fi Location을 사용하면 셀프 로케이팅 AP(self-locating AP)가 정확한 실내 위치를 설정하고 6 GHz 표준형 애플리케이션을 활성화할 수 있습니다. 클라이언트 기기는 FTM Range Request and Report를 사용하여 정보 공유 없이 브로드캐스팅 AP를 기준으로 자신의 위치를 확인할 수 있으므로 개인정보를 노출하지 않으면서 높은 정확도를 제공합니다. Wi-Fi Location은 내비게이션 목적의 위치 정보 정확성을 향상시킬 뿐만 아니라, 더욱 풍부한 기능을 제공하는 새로운 애플리케이션과 서비스 구현이 가능하도록 해줍니다. Wi-Fi는 광범위하게 보급되어 있으며 추가 장비 없이 기존 네트워크 인프라를 활용하여 손쉽게 정확한 실내 위치를 제공할 수 있습니다. Wi-Fi Location은 산업, 기업, 유통, 의료 부문에서 다음과 같은 이점을 제공합니다.
- 실내 내비게이션: Wi-Fi Location은 초당 수 차례 업데이트되면서 1미터 이내의 정확성을 제공합니다.
- 자산 관리: 어셋 트래킹(Asset Tracking)을 통한 고가의 이동 자산 관리
- 네트워크 관리: 트러블슈팅과 유지보수가 필요한 지점을 정확히 파악
- 지오펜싱(Geo-fencing): 기기가 설정된 바운더리 내부 또는 외부로 이동할 시에 특정 액션을 트리거하는 가상 경계 생성.
- 셀프 로케이팅 AP(self-locating AP): Wi-Fi Location을 통해 셀프 로케이팅 AP가 정확한 실내 위치를 설정하고 6 GHz 표준형 애플리케이션을 활성화할 수 있습니다.
- 긴급 서비스: 주소와 층수로 위치를 제공하는 Wi-Fi Location 기능은 긴급 서비스 대응 시간을 단축하는 데 도움이 될 수 있습니다.
|Wi-Fi CERTIFIED Location™ capabilities demonstrated at Lisbon member event|
|Wi-Fi®, 강력한 IoT 이점 제공|
|Wi-Fi Location™: Performance drivers for Wi-Fi® ranging technologies and its achievable accuracies|
|Episode 24: Looking toward the future of Wi-Fi Location™ with Rolf de Vegt of Qualcomm|
|Episode 22: Optimizing retail conversion and sustainability through Wi-Fi Location™ with Staffan Liljestrand of Bumbee Labs|
- What is the difference between Wi-Fi Aware and Wi-Fi Location?
Wi-Fi Aware enables a service/data connection to be established between two client devices. It can be enhanced further by specifying a range to limit service access, and this range is determined by the FTM protocol. Wi-Fi Location also uses FTM, and if limited to two devices, it can determine their proximity e.g., for a wireless key/lock application. Wi-Fi Location can also be used by a mobile client to determine its distance to several fixed position devices (usually Wi-Fi access points), which can then support higher-level services, such as indoor navigation.
- Does Wi-Fi Location coexist better with a Wi-Fi data service and ensure quality of service compared to other localization technologies?
A localization service is part of a larger connectivity service. By using the Wi-Fi network to provide location services, native co-existence is achieved between the location and core data connectivity service. This kind of native support results in an ability to maintain the QoS of the data service, while ensuring the performance and accuracy of the location service.
- How do environmental factors affect Location accuracy?
The environment can play a role, and introduce multipath, which may cause the range to be overestimated. This includes building materials, the presence of RF reflectors such as HVAC metal ducting, and some eco-glass designed to reflect the sun’s rays, but also reflects RF. Often these effects are transitory for a mobile device, and a typical motion filter will remove them from the estimated path.
- How does the Wi-Fi channel bandwidth affect location precision?
Location precision is inversely proportional to bandwidth. If an 80 MHz channel bandwidth results in a location precision of 1 meter, then for a 160 MHz bandwidth channel, the precision will be roughly 0.5 meters.
- At what rate can Wi-Fi Locations be estimated to support indoor navigation?
This depends on the implementation, but there are commercial examples of devices that can range to 6 access points at 2-3 Hz. When combined with digital maps, this results in a smooth turn-by-turn navigation experience. The ranging rate when multiple devices are positioning at the same time will also affect network utilization and needs to be considered when a network deployment is being planned.
- What are the network infrastructure benefits of accurate Wi-Fi Location?
For the Wi-Fi infrastructure venue owner, Wi-Fi Location provides a valuable additional user-facing location service (see "What are the primary uses of Wi-Fi Location?” for examples), with no additional operational cost, and may even save running costs by helping the owner maintain their network, locating access points after site remodels.
- What are the mobile client benefits of accurate Wi-Fi Location?
Wi-Fi Location enables a mobile client to determine its location to an accuracy of about 1 meter (at 80 MHz bandwidth), when operating within a Wi-Fi network. There is no additional hardware cost, or any significant impact on battery lifetime.
- What is the value of Wi-Fi CERTIFIED Location?
Wi-Fi CERTIFIED Location ensures a Wi-Fi product conforms to the IEEE standard with respect to the FTM protocol and can operate within the accuracy expected for range estimation. Positioning and applications, such as indoor navigation, can be supported when all participating devices have certification.
- What is the difference between ranging and location?
Wi-Fi ranging estimates the distance between two devices using the FTM protocol. When three or more ranges to nearby access points at known positions are combined, the mobile device can estimate its own location (or position) on a map.
- What are the primary uses of Wi-Fi Location?
Wi-Fi Location can be used where GPS cannot. A typical location-based application is positioning and route finding inside a building (aka indoor navigation), allowing users to be directed to a specific place, thing, or product. It also enables proximity applications, which include wireless keys/locks, smart home control (actions triggered by relative positions of devices), and access-control to digital resources based on location.
- How does Wi-Fi Location determine a mobile client device’s location?
Wi-Fi Location uses the time-of-flight (ToF) of IEEE 802.11 frames to locate a device within a network (also called round-trip-time (RTT)). It is based on the Fine Timing Measurement (FTM) protocol, enabling a mobile device to estimate its distance relative to one or more fixed position Wi‑Fi access points (APs) in the network. The mobile device can then combine these measurements, and locate itself on a floorplan, map or in latitude and longitude coordinates.
- Does my client device need to be associated with an access point on a network to determine location?
No, using Wi-Fi Location, a client device can negotiate with an access point (AP) to determine its location even when the client device is not associated with that AP.
- Must both client and network devices be Wi-Fi Location enabled for Wi-Fi Location to work?
Yes, both client and network infrastructure devices must be Wi-Fi Location enabled to support positioning.
- How many infrastructure devices are needed to accurately determine a device’s location?
To determine its location on a map, a mobile client device must use a minimum of three distance measurements to nearby access points at known positions, a process called trilateration. However, more distance measurements to additional access points improves location accuracy, and typically avoids inaccuracies introduced by poor access point layout.
- Is Wi-Fi Location power efficient?
Yes. Wi-Fi Location minimizes its impact on client battery life by allowing a device to negotiate the scheduling, and operational parameters, for a Fine Timing Measurement (FTM) protocol exchange. A single RF distance measurement can be completed in as little as 0.5 milliseconds.
Qualcomm Wi-Fi Ranging: Delivering ranging and location technologies of tomorrow today
Qualcomm Technologies, Inc.