Unify OpenScape WL 4 Planning Manual
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Also See for OpenScape WL 4:
- User manual (83 pages) ,
- Quick reference manual (28 pages) ,
- Installation manual (17 pages)
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Summary of Contents for Unify OpenScape WL 4
- Page 1 System Planning OpenScape WL 4 / OpenScape WL4 Plus Planning Guide A31003-M2000-P103-01-76A9...
- Page 2 As reseller please address further presales related questions to the responsible presales organization at Unify or at your distributor. For specific technical inquiries you may use the support knowledgebase, raise - if a software support contract is in place - a ticket via our partner portal or contact your distributor.
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Page 3: Table Of Contents
Contents Contents 1 Introduction..........................4 2 Overview.............................5 2.1 Introduction to Wireless Planning.................... 5 2.1.1 Physical Separation......................6 2.1.2 Logical Separation......................6 2.2 5GHz Radar Protection in DFS Channels................7 2.3 Support for 802.11 krv......................8 3 Wired LAN and Backbone Requirements................10 3.1 Quality of Service Recommendations..................10 3.1.1 IEEE 802.11 Priority Field....................10 3.1.2 IEEE 802.1q Priority Field.................... -
Page 4: Introduction
Introduction Introduction This document describes how to plan for an optimal VoWiFi System when deploying the OpenS- cape WLAN Phone WL4. This document is intended as a guide for considerations on Wireless Local Area Network (WLAN) infrastructure planning and installation to obtain maximum perfor- mance with respect to voice quality. -
Page 5: Overview
Overview Introduction to Wireless Planning Overview Data and voice traffic have different characteristics and thus put different requirements on the design of the WLAN. This chapter describes how to set up a WLAN designed for mission-critical data communication, especially Voice over Internet Protocol (VoIP) traffic. Introduction to Wireless Planning When designing for mission-critical data communication, it is important to have short roaming times and low-latency communication to avoid disruptions/breaks in the voice communication. -
Page 6: Physical Separation
Overview Furthermore, the design problems get even more complex if Wi-Fi RFID tagging and location traffic are also using the WLAN, because they require a completely different design. The best solution to avoid these design problems is to separate traffic types, either physically ( see Physical Separation on page 6) or logically (see... -
Page 7: 5Ghz Radar Protection In Dfs Channels
Overview 5GHz Radar Protection in DFS Channels • Reducing the broadcast domain. • Separating traffic types. • Protecting devices from access by unauthorized personnel. • Giving priority in the network for some kind of traffic. • Using role-based access rights and access to a VLAN depending on user group membership. •... -
Page 8: Support For 802.11 Krv
Overview Support for 802.11 krv handset is dropped by the AP due to such a switch, the data traffic is delayed for a short while. This may result in a short disruption in a voice call, but would probably not be noticed for other types of data traffic. - Page 9 Overview When 802.11k is used, each AP holds a list of the channels used by its neighbors, and sends this list to newly associated clients. Then the handset only needs to scan the channels present in the latest received Neighbor List when trying to roam from an AP. In this setup, a full scan of all channels is performed only if the OpenScape WL4 handset has failed to find a roaming candi- date in the Neighbor List.
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Page 10: Wired Lan And Backbone Requirements
Wired LAN and Backbone Requirements Quality of Service Recommendations Wired LAN and Backbone Requirements Quality of Service Recommendations To be able to provide voice grade communication over WLAN, the use of WMM or 802.11e is a necessity. These standards define the mapping of priorities on the WLAN to priorities on the wired LAN using either Layer 2 (CoS, Class of Service) or Layer 3 priorities Differentiated Ser- vices Code Point (DSCP). -
Page 11: Diffserv, Dscp Value
Wired LAN and Backbone Requirements End-to-End Quality of Service NOTICE: The use of the 802.1Q VLAN tag does not require an implementa- tion of a full-blown VLAN system since by default all devices belong to the same VLAN and thus can communicate with each other. This VLAN is often called the native VLAN, and often has a VLAN ID of 0. -
Page 12: Downlink : Access Point To Handset
Wired LAN and Backbone Requirements NOTICE: The 802.1p priority tag is not likely to be preserved if VLANs are not configured throughout the wired network. If the packets travel across different subnets, the router configuration needs to cope with preserving the 802.1p priori- ty tag. -
Page 13: Security Considerations
Security Considerations Security Considerations The handset can be configured to use various encryption and/or authentication schemes. The use of extensive encryption/authentication schemes can cause incidents of dropped speech dur- ing handover due to the time to process the authentication. No speech frames are delivered to/ from the handset until the authentication is successfully completed. -
Page 14: Basic Cell Planning
Basic Cell Planning Basic Cell Planning Normally, a sufficient number of channels are available to plan the cells for frequency reuse at a distance large enough to limit the effects of co-channel interference. 2.4 GHz IEEE 802.11 operation in the 2.4 GHz band only provides the use of three non-overlapping chan- nels, channel 1, 6, and 11. - Page 15 Basic Cell Planning • Roaming • Noise interference The wireless cell planning is done using an AP placement tool which estimates the placement of APs based on the building/campus characteristics. It is recommended that a site survey is done using the built-in tools in the handset. The tool provides a true measurement of the RF environ- ment based on the radio of the handset.
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Page 16: Transmission Rate
Basic Cell Planning Transmission Rate (20 dBm). Since the Unify handset transmission power is pre-configured to ap- proximately 100 mW, this ensures a symmetric wireless link. The illustration also is valid for other transmission power settings. Transmission Rate To maintain high capacity in each cell, the radio signal strength must be sufficient at all places in the cell where STAs are expected. - Page 17 Basic Cell Planning Book shelf 2 dB Plasterboard wall 3 dB NOTICE: The attenuation for the -a radio is, from a general point of view, higher than for -b/g. A31003-M2000-P103-01-76A9, 29/04/2020 System Planning, Planning Guide...
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Page 18: Co-Channel Interference
Co-Channel Interference Clear Channel Assessment Co-Channel Interference There are only three non-overlapping channels available in the 2.4 GHz band at 20 MHz that re- sult in a high probability of channel reuse within a close proximity. In b/g/n 40MHz channels should be avoided in the 2.4 GHz band. With 40 MHz channel width, only one or two channels can be used in the WLAN system (depending on country regulations). -
Page 19: Hidden Node Problem
Co-Channel Interference Hidden Node Problem Figure 4: CCA might cause problems even for far away STAs The CCA makes 802.11 equipment sensitive to other transmissions. This applies to all RF sig- nals, not only other 802.11 equipment. If CCA problems occur, it affects the transmission part of the link between the AP and the handset. - Page 20 Co-Channel Interference Figure 5: STAs and an AP showing simultaneous transmission and collision The hidden node problem is accentuated when adjacent cells use the same channel. One com- mon solution to this problem is to use Request-To-Send/Clear-To-Send (RTS/CTS). However, the use of RTS/CTS introduces overhead for all clients in the cell and is not recommended. A31003-M2000-P103-01-76A9, 29/04/2020 System Planning, Planning Guide...
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Page 21: Ap Placement For Optimal Performance
AP Placement for Optimal Performance AP Placement for Optimal Performance There is a contradiction between the two essential requirements for optimal AP placement. Good performance requires good coverage, but “over-coverage” reduces the performance. As described in Basic Cell Planning on page 14, enough overlap between adjacent cells is need- ed to have sufficient radio signal strength at all places and enough margin when roaming be- tween cells. -
Page 22: Conflicting Interests With Rtls Placement
AP Placement for Optimal Performance Conflicting Interests with RTLS Placement In a building with thick walls APs may need to be placed inside the rooms for optimal coverage. Then a placement of an AP in the walking path outside these rooms is recommended to mini- mize the amount of roamings, see Figure 7: Recommended placement of AP to reduce roaming between APs in separate rooms... -
Page 23: Infrastructure Dependant Features
Infrastructure Dependant Features Automatic RF Adaptations in WLAN Systems Infrastructure Dependant Features This chapter includes information on tools and features dependant on the WLAN infrastructure. Automatic RF Adaptations in WLAN Systems Many WLAN infrastructures make use of an internal tool that is changing the AP channels and/or transmit power level in a dynamic way. -
Page 24: Regulatory Domain - 802.11D
Regulatory Domain - 802.11d Regulatory Domain - 802.11d NOTICE: 802.11d is not allowed in the US. IEEE 802.11d was developed to support the use of equipment across regulatory domains around the world without violating the local frequency rules. The 802.11d regulatory domain informa- tion is broadcast in beacons and contains information on which channels and power levels are allowed. -
Page 25: Related Documents
Related Documents Related Documents OpenScape WLAN Phone WL4 VoWiFi System Migration Guide Configuration Manual, OpenScape WLAN Phone WL4 A31003-M2000-P103-01-76A9, 29/04/2020 System Planning, Planning Guide... -
Page 26: Migration
• Despite the fact that all Unify products can be deployed in the same network system, it is still recommended to perform a test before deploying, for example OpenScape WLAN Phone WL4 in an environment with WL3 handsets. - Page 27 Migration • Voice quality in walk and talk test. This can be done by measurement only, and of course by listening to real calls. A31003-M2000-P103-01-76A9, 29/04/2020 System Planning, Planning Guide...
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