Grandstream Networks GWN7610 Deployment Manual
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Summary of Contents for Grandstream Networks GWN7610
- Page 1 Grandstream Networks, Inc. GWN7610/GWN7600/GWN7600LR Wireless Access Points Deployment Guide GWN7600LR GWN7610 GWN7600 Outdoor Long Range 802.11ac Enterprise 802.11ac Mid-Tier 802.11ac Wave-2 Wave-2 WiFi Access point WiFi Access Point WiFi Access Point...
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Page 2: Table Of Contents
Table of Contents OVERVIEW ........................4 WLAN Technical Features ........................4 WLAN Product Introduction ........................4 WLAN PLANNING AND DEPLOYMENT ............... 5 The Importance of Planning ........................5 How to Plan Deployment ........................6 First Step: Plan Efficient Channel Multiplexing and Minimize Channel Sharing ......6 Second Step: Improve the Air Interface Efficiency in a Single Channel Coverage Cell .... - Page 3 Table of Figures Figure 1: Positions of Access Points deployed on the Floor Plan ..............5 Figure 2: Schematic Diagram of Efficient Channel Multiplexing ..............7 Figure 3: WiFi SNR APP ..........................11 Figure 4: Acrylic Wi-Fi Professional Software ..................... 12 Figure 5: Channels overlapping on the 2.4GHz ..................
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Page 4: Overview
This document applies to people: enterprise wireless network integrator, wireless network operation and maintenance administrator. WLAN Product Introduction Grandstream offers 802.11ac series wireless products, including GWN7610, GWN7600 and GWN7600-LR product features and applications as shown in Table 1 below: Table 1: GWN76xx Features and Applications... -
Page 5: Wlan Planning And Deployment
WLAN PLANNING AND DEPLOYMENT The Importance of Planning With the tremendous growth of WiFi clients and mobile Internet applications, wireless LANs have evolved from pursuit of connectivity and coverage to the goal of high-capacity access. High capacity is meant to support as many wireless clients as possible, and guarantees the experience of its key business applications. -
Page 6: How To Plan Deployment
Before the network deployment is delivered, people ran test at night time after work, and network speed can always reach to the full speed of their ISP bandwidth. However, after the wireless network is put into use at daytime, the user experience is unexpected terrible, and employees continuously complain the slow network. -
Page 7: Figure 2: Schematic Diagram Of Efficient Channel Multiplexing
In the United States, for example, there are only 3 non-overlapping channels (CH1/CH6/CH11) in the 2.4 GHz band, and the resources are more abundant in the 5 GHz band. Under normal circumstances, there are 9 non-overlapping channels, respectively CH36/CH40/CH44/CH48, and CH149/CH153/CH157/ CH161/CH165. -
Page 8: Second Step: Improve The Air Interface Efficiency In A Single Channel Coverage Cell
How to achieve an efficient channel multiplexing of dense microcells deployment? There are few methods: • Control the transmit power of the AP on a minimum level, as long as AP transmit power can cover the size of the planned cell. •... -
Page 9: Significance Of Radio Signal Parameter
Significance of Radio Signal Parameter Wireless networks have been closely integrated with people's lives, work, and entertainment. However, users of WLAN wireless networks may think that wireless network should have the same stable as wired networks. In fact, evaluating the performance of a wireless network is very different from evaluating the performance of a wired network. -
Page 10: Snr (Signal-To-Noise Ratio)
SNR (Signal-to-Noise Ratio) For the client, the most important indicator to evaluate its performance is the signal-to-noise ratio (SNR). Following SNR, we can focus on the received signal strength and retransmission rate. The signal-to-noise ratio is the difference between the signal and the noise floor. The larger the difference is, the better the signal quality will be. -
Page 11: Figure 3: Wifi Snr App
How to effectively achieve high signal-to-noise ratio? It is obviously not a good idea to simply increase the AP transmit power. The non-overlapping channels (or channel combinations) are limited. If more APs are deployed and the signal strength is increased, the chance of same-frequency interference will be increased. -
Page 12: Channel Utilization
Besides, Acrylic_WiFi_Professional is a Windows software to run measurement through your PC/laptop: Download link the software: https://www.acrylicwifi.com/en/wlan-wifi-wireless-network-software-tools/wifi- analyzer-acrylic-professional/wifi-network-scanner-windows/ Figure 4: Acrylic Wi-Fi Professional Software Channel Utilization For coverage cells formed by APs, the most critical indicator for assessing their performance is Channel Utilization. - Page 13 1. Where does channel utilization come from? First, Wi-Fi client’s data transmission will occupy channel. The larger the data packet to be sent, the longer the time that the sender occupies the channel. Also, the slower the transmission rate is, the longer the time that the sender occupies the channel.
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Page 14: Figure 5: Channels Overlapping On The 2.4Ghz
Figure 5: Channels overlapping on the 2.4GHz The adjacent channel interference in the 5GHz spectrum is mainly reflected in the interference between channels of different channel widths. • Non-WiFi Interference (Other wireless appliances) Non-WiFi Interference can come from Bluetooth devices, microwave ovens, digital enhanced cordless communication (DECT) phones, surveillance cameras, or any other device that uses the same RF frequency as the Wi-Fi channel but does not use the 802.11 protocol. -
Page 15: Figure 7: Band Utilization
b) Enter “9” to select Maintenance. After entering the page, enter “99” again, select “[99] Band Utilization”, wait for 10~15 minutes of channel scan time, and get channel utilization of 2GHz and 5GHz support channels. Rate information, as shown in Figure 7 below. Figure 7: Band utilization •... -
Page 16: Figure 8: External Interference Caused By Other Wireless Appliances
Figure 8: External interference caused by other wireless appliances 3. How to reduce high channel utilization Usually, channel saturates when utilization is between [40%, 50%]. In this range, wireless network is still OK for most applications. But for latency-sensitive applications, such as VoIP, channel utilization above 30% may affect the user experience. - Page 17 2. Turn off the low rate connection (feature pending on GWN APs) When the client is far away from the AP, the data connection rate is reduced by one or several levels, which causes same data amount will consume a longer period of time, and a higher channel utilization. Forbidding the low data rate force the wireless client to roam to a nearby reliable access point, so that this wireless client can communicate in a high data rate, which will reduce the channel utilization when same amount of data is transmitted.
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Page 18: Figure 9: Control Cellular Size Of The Ap By Lowering The Transmission Power
Figure 9: Control cellular size of the AP by lowering the transmission power In this scenario, the access point has the connection rate below 24 Mbps closed. (18 Mbps and 24 Mbps are relatively stable connection rates. Please do not close it in real deployment.) By standing at the position of -80dbm, the probability of beacon being detected is reduced by a lot. -
Page 19: Impact Of Client Performance
Impact of Client Performance When designing and deploying and verifying wireless networks, we often focus only on the capabilities of offered wireless network on APs’ side and ignore the very important element of the wireless network - the wireless client. Therefore, we must consider the capabilities and device behavior of target Wi-Fi clients when designing and deploying and verifying wireless networks. -
Page 20: Table 2: Transmission Power Of Some Smart Phones
Table 2: Transmission power of some smart phones The Wi-Fi system is bidirectional. If the transmit power of the AP is higher than that of the client, the downlink signal of the AP can reach the wireless client smoothly. However, the uplink signal of the wireless client cannot reach the AP effectively. - Page 21 So, the correct approach is: study the client's behavior, roaming area, and analyze the indoor building partition, and then properly set the transmission power as low as possible while still providing enough coverage. As a part of planning of wireless network deployment, it important to analyses the customer requirement. So, in the early stage of planning, you will need to: 1.
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Page 22: How To Deploy With 802.11Ac
How to Deploy with 802.11ac As mentioned earlier, an important step in real deployment of WLAN is to improve the air efficiency in channel, that is, to establish a higher connection between the client and the AP. Compared to 802.11a/b/g/n, high date rate is also the advantage of 802.11ac. -
Page 23: Figure 10: Required Snr Value In The 256Qam Modulation Mode
a) Stronger modulation method Wireless transmission is affected by a number of factors that can damage the RF signal quality and cause the receiver fail to read. So, each data bit is encoded into multiple bits before transmission. This way of adding redundant information to the data can improve the system's ability to resist data corruption, which we call encoding. -
Page 24: Figure 11: 5Ghz Channel Numbers And Distribution Maps (Gwn Us Model)
Below is an example for US GWN model, 5GHz channel numbers and distribution maps (Figure 11): Figure 11: 5GHz channel numbers and distribution maps (GWN US model) • 20MHz channel width: 9 available (CH36~48, CH149~CH165) • 40MHz channel width: 4 available (CH38, CH46, CH151, CH159) •... -
Page 25: Figure 12: Diagram Of Downlink Transmission Of Su-Mimo And Mu-Mimo
Figure 12: Diagram of downlink transmission of SU-MIMO and MU-MIMO However, MU-MIMO cannot solve all problems of Wi-Fi slowness. As mentioned, it only optimizes multi- user transmission efficiency. Below are some limitations: 1) MU-MIMO requires protocol support on both wireless access points and wireless clients. However, there still a great number of user device without 802.11ac support. -
Page 26: How To Deploy With 802.11Ac Wireless Products
Figure 13: SU-MIMO Omnidirectional antenna vs MU-MIMO beamforming 4) In the process of simultaneous downlink data transmission, in order to avoid co-channel interference between MU-MIMO clients, these clients need to be separated in physical space to increase the anti-interference physical isolation. 5) MU-MIMO is aiming at improving the multi-user downlink aggregation throughput, instead of ensuring each client’s peak throughput. - Page 27 2. 802.11ac deployment common parameters • Frequency band: Compared with the 2.4G frequency band, the spectrum resources of the 5G frequency band are more abundant. In the US region, there are currently 9 available 20MHz channels. A wide range of spectrum resources can be used to achieve efficient channel multiplexing. For a typical Wi- Fi network, it is recommended that adjacent APs use different channel ranges, that is, AP1 uses CH36~CH48 frequency band, and neighbor AP2 uses CH149~CH165 frequency band.
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Page 28: Figure 14: 2.4G Channel Distribution Map
Figure 14: 2.4G Channel Distribution map Figure 15 is the spectrum of the 20MHz channel. The signal of CH1 has been attenuated to below -100dBm in CH6, which has little effect on CH6. Therefore, we can achieve wireless coverage by multiplexing CH1/CH6/CH11 channels. -
Page 29: Figure 16: Spectrum Of The 40Mhz Channel
However, look at the spectrum of the 40MHz channel (as shown in Figure 16 below). The 40MHz signal formed by the combination of CH1 and CH5 raises the noise floor of CH11 by 20dB! As mentioned in the previous section of SNR, the signal quality is not to depended on the absolute signal strength, but on the difference between the signal strength and the noise floor. -
Page 30: Figure 17: 5G Primary And Secondary Channels
• 5G channel selection and channel bandwidth issues When discussing 5G channel selection, two terms need to be introduced: primary channel and secondary channel, as shown in Figure 17 below: Figure 17: 5G primary and secondary channels 802.11ac adopts channelization design, and 20/40/80/160MHz is combined by channel channels with a bandwidth of 20MHz. -
Page 31: Table 4: Signal And Energy Detection Threshold For The Primary And Secondary Channels
a) Basic channel access rules 1. To send 20MHz frame only on a 20MHz primary channel. It only requires performing CCA idle detection on the 20MHz primary channel, for example, CH60. 2. To send 40MHz frame on the 40MHz primary channel. It requires idle detection on both 20MHz primary and secondary channel. - Page 32 If the air environment is very idle. For example, only a few APs are deployed, and the planning for channel multiplexing are performed efficiently. Most of the time, the AP will be able to achieve the full speed with 80MHz bandwidth. If the AP is deployed in a high-density environment and the same-channel and adjacent-channel interference is large, the AP can hardly find the available bandwidth of 80MHz, then AP will perform channel bandwidth fallback.
- Page 33 *Gt[dBi] is transmit antenna gain; *Gr[dBi] is receiving antenna gain; *Pl[dB] is path loss (including spatial propagation loss, wall/glass blocking loss); Example: Assume that the Pt is 26dBm, the Gt is 5dBi, the Gr is 3dBi, and the path loss is 100dB (including spatial path loss and wall loss).
- Page 34 6. Adjacent APs need to have a certain coverage overlap, which is usually 10%-20% distance. It is for client roaming and precise positioning. But we still need to strictly control the transmission power. 7. Prioritize the SSID and limit the speed of the unimportant client; 8.
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Page 35: Figure 18: Selection Of 5G 20Mhz Primary Channel
Figure 18: Selection of 5G 20MHz primary channel 11. Recommended 5G channel bandwidth selection in different scenarios: ❖ 20MHz channel bandwidth: high-density areas, such as large stadiums, large event gatherings, urban hotspots where many WLAN networks are deployed; ❖ 40MHz channel bandwidth: normal-density area, such as large building office area; 80MHz channel bandwidth: low-density areas, such as small building areas, and areas with ❖...