Breaking News
Newest First | Oldest First | Threaded View
User Rank
re: Real-world testing of Wi-Fi hotspots
Skip_B   8/14/2012 8:53:42 PM
The article is accurate in that the potential bandwidth of the wireless network will vary according to the number of users and the content. The location of the user (unless they are a Hidden Note) is irrelevant. If they are associated to the AP they are taking up available BW and a "slice" of the available Data Rate. What is relevant is the potential Data Rate available to the user. This is controlled by: 1) The available DR's as determined by the AP in the Beacon and/or Probe Response frame, set in the AP config. 2) The perceived RSSI at the client device which is provided to the Client NIC Driver and then used as part of the clients DRS(Data Rate Shift)decision process (Not covered in the 802.11 standard). This information is available my consistently monitoring the WLAN 'Airspace' and can be reported on as a whole and/or by device depending on the product used for monitoring. This is because 802.11 WLAN's are half duplex and the medium is shared utilizing DCF (Distributed Coordination Function) for medium Access, part of the medium contention and collision avoidance mechanism(s) of 802.11 CSMA/CA. With regard to Coverage Quality monitoring, your results will vary with the environment due to the irregular propagation characteristics of RF. We also cannot assume equal omni-directional coverage, because RF will not radiate equally in all directions and is also directly affected by the environmentals. The best way to monitor WLAN Quality for SLA is to use an independent overlay system such as Fluke Networks - Airmagnet Enterprise. This product can monitor multiple sites and multiple areas, providing performance alerting and statistical monitoring along with Active Health Checking of the HotSpot environment. This provides real-time, factual and trending over time data for SLA Performance analysis with the ancillary benefit of being able to remotely troubleshoot to Root Cause any wireless issues noted.

User Rank
re: Real-world testing of Wi-Fi hotspots
chanj0   8/14/2012 4:24:39 PM
The WAN throughput represents the utilization of the bandwidth, measuring the service quality that the ISP is providing. It varies according to the number of users and the content the users are pulling. On the contrary, the potential bandwidth of the wireless per user varies according to the relative location of the user to the connected AP. It affects the throughput the user is getting. How can we assure the user is getting the service quality he/ she is paying for? Maybe, the data rate relative to the RSSI will give us a clue. The article brings up a very good point. Service provider wants to know the information in different spot of the coverage. It isn't necessarily accurate. If we assume omnidirectional coverage, we will have an idea of signal strength vs distance from the AP. Smart antenna makes it complicated. Measuring quality in wide area deployment is one tough challenge. What's the best way to consistently monitor service level in a large scale deployment?

Flash Poll
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Engineer's Bookshelf
Caleb Kraft

The Martian: A Delightful Exploration of Math, Mars & Feces
Caleb Kraft
To say that Andy Weir's The Martian is an exploration of math, Mars, and feces is a slight simplification. I doubt that the author would have any complaints, though.

The Engineering Life - Around the Web
Caleb Kraft

Surprise TOQ Teardown at EELive!
Caleb Kraft
Post a comment
This year, for EELive! I had a little surprise that I was quite eager to share. Qualcomm had given us a TOQ smart watch in order to award someone a prize. We were given complete freedom to ...

Design Contests & Competitions
Caleb Kraft

Join The Balancing Act With April's Caption Contest
Caleb Kraft
Sometimes it can feel like you're really performing in the big tent when presenting your hardware. This month's caption contest exemplifies this wonderfully.

Engineering Investigations
Caleb Kraft

Frankenstein's Fix: The Winners Announced!
Caleb Kraft
The Frankenstein's Fix contest for the Tektronix Scope has finally officially come to an end. We had an incredibly amusing live chat earlier today to announce the winners. However, we ...

Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)