4 TPCv2 - OverviewTPCv1 is designed to provide strong signal coverage with a tendency to use higher Tx PowerAs a result, escalation teams have reported customer cases suffering from overheating in densely deployed networksTPCv2 will optimize the coverage and the interference in a coordinated way based on the measurement readings from APsTPCv2 identifies the deployment density that each AP experiences, and determines TxPower for that AP considering:The overlap area / the amount of interference that adjacent APs generateThe coverage area that each AP generatesA novel Co-channel interference metric.
5 TPCv2 - Overview Introduces two new features: Redundant AP List TPCv2 algorithm detects APs that contribute more to interference than to coverage expansion and which be manually disabled without adversely impacting coverageTPCv2 does not automatically disable / enable APs’s radiosEssentially a new proprietary metric for Co-Channel interferenceDetermines the number of excessive APs seen in the networkMemoryful evolution of the planUnlike TPCv1 where the channel plan is computed with each itineration of the algorithm implemented and then forgotten – Fire and ForgetTPCv2 finds a best plan, declared the Target Plan, and then deploys the Target Plan incrementally, but not abruptly allowing the network to evolve gradually – Gradual improvement over timeOnce the network reaches the Target Plan, then TPCv2 reinstates a new TxPower plancomputation.
6 TPCv2 - OverviewFor appropriate marketing purpose, we show AP Utility instead of actual redundant AP listAP Utility represents the percentage of time (more precisely the percentage of RRM executions) during which the AP of interested was marked as non-redundant.For Example - TPC runs 100 times after controller is reset and a particular AP was marked redundant 10 out of 100 times then the AP utility figure is 90%AP utility information is only visible from the controller CLI using:show advanced a summaryshow advanced b summary“show advanced a/802.11b txpower” will show quality measurements of past tenTxPower plans. One can compare the quality of TPCv2 with previous version by changing theTPC version in the middle after running ten consecutive TPCs.
7 TPCv2 - CaveatsTPCv2 inherits the same messaging path and the functional interfaces from TPCv1.As a result, the change in the TPC algorithm remains quite transparent on the outsideHowever TPCv2 does require changes from previous releases, specifically in RRM messagingAlthough the grouping algorithm will not be directly affected by these changes – TPCv1 and TPCv2 groups will not be interoperable
8 TPCv2 - CaveatsTPCv2 runs in a flexible manner and is skipped if the previous computation or deployment is still pendingThe TPCv2 outcome controls the transmission power of the Beacons as well as downstream data packets.Reduced Tx power implies less interference at neighboring cells and decreased RSSI at served clients within the cell.The decreased RSSI may lead to:Client drop outIncreased Packet Error RateA switch to a slow modulation speed.This is a delicate balancing problem with no single solution. The right way to hit the balance is the optimization of the configuration through the simulation and the field test..
9 TPCv2 – CLI Configuration Commands To configure the TPC version in use by the WLC use:config advanced a tpc-version <version>config advanced b tpc-version <version>To configure the TPCv2 algorithm parameters in use by the WLC use:config advanced a tpcv2-thresh <thresh>config advanced a tpcv2-per-chan <enable|disable>config advanced b tpcv2-thresh <thresh>config advanced b tpcv2-per-chan <enable|disable>
10 TPCv2 – CLI Verification Commands To show the current TPC version and TxPower plan quality in use by the WLC use:show advanced a txpowershow advanced b txpowerExample outputOverall quality, coverage, and Co-channel interference metricsThe closer to 0.0 these quality index's are – the closer the WLC is to having implemented the Target plan. Remember the goal of TPCv2 is the best coverage with the least amount of co-channel interference possible and the least number of redundant ApsA very good read is EDCS the TPCv2 Design Specificaation
11 TPCv2 – CLI Verification Commands To see the current TPC running configuration and the list of Redundant APs on the WLC use:show advanced a summaryshow advanced b summaryExample outputHere the AP named AP3502-CA shows as a Redundant AP which could have the 2.4GHz radio disabled
13 RF Profiles - OverviewCommon for area’s requiring conflicting coverage to border one anotherFor example – A large conference room bordered by open cubicle spaceProviding adequate coverage in high density areas typical entails deploying a high number of APsGenerally requiring manipulation of both data rates and transmit power levelsRaising the cell density while still managing co-channel interference issuesAdjacent areas requiring normal coverage are adversely impacted by these same changes – typically showing up as a loss in coverageWhile RF Groups have always been available 7.2 introduces RF profiles to overcome these problemsThe combination of RF Profiles and Groups allow administrators to optimize the RRM settings for groups of AP’s operating in different coverage modelsIn today’s corporate environment, administrators are facing an ever-increasing demand for Wireless LAN services. It is also quite common for area’s requiring conflicting coverage goals to border one another because in reality, most deployments have varying density of coverage requirements in various areas. For example, a business may have both areas where a high number of users will meet and congregate. Such as a large conference room or Presentation Theater, as well as open cubicle spaces spread across multiple floors. In order to provide adequate coverage in the high-density areas a high number of APs is typically deployed. This generally requires manipulation of both data rates and power to raise the Cell density while managing co-channel interference. While in directly adjacent areas – normal coverage is provided and such manipulation would result in a loss of coverage. Using RF Profiles, and AP Groups provides for this solution.
14 RF Profiles - OverviewRF Profiles allow the administrator to tune groups of AP’s sharing a common coverage zone together.Selectively changing how RRM will operate the AP’s within that coverage zoneRF Profiles are created for either the 2.4 GHz radio or 5GHz radioProfiles are applied to groups of AP’s belonging to an AP Group, in which all AP’s in the group will have the same Profile SettingsThere are two components to this feature:RF Groups – Existing capability – No impact on channel selection algorithmsRF Profile – New in 7.2 providing administrative control over:Min/Max TPC valuesTPCv1 ThresholdTPCv2 ThresholdData Rates(NOTE: only one version of TPC can be operable for RRM on a given controller, and Version 1 and Version 2 are NOT interoperable within the same RF group)(NOTE: If you select a threshold value for TPCv2 and it is not the chosen TPC algorithm for the RF group – this value will be ignored)
15 RF Profiles - OverviewApplication of an RF profile does not change the assigned AP’s status within RRM (RF Group assignment)It is still in Global mode controlled by RRM– and all AP’s remain part of the same original RF Group.CAUTION – AP Groups and RF Profiles can get complex quicklyMost installations have only a couple of different coverage zones that will benefit from having this featureIn most cases RRM is doing an adequate job alreadyIn order for RF Profiles to work:ALL AP’s assigned must have their channel and power managed by RRMAn AP that has a custom power setting applied for AP Power is not in Global ModeAn RF Profile will have no affect on this AP.
16 RF Profiles - Implementing RF Profile configuration and administration are supported via the:WLC –CLIWLC – GUICisco Prime NCS version 1.1Exercise caution when implementing and changing RF Profiles as they can be client impactingChanging the data rates of an AP radio requires the affected network be disabledApplying an RF Profile to an AP Group that changes the data rates will require that the affected network (2.4 /5 GHz) be disabledYou can create RF Profiles and apply them to a New or empty AP group (no AP’s assigned) without either requiring the network to be disabled or rebooting the AP.
17 RF Profiles - Implementing Once you have created an AP Group and applied RF Profiles the new settings are in effect and the following rules around changes become effective:RF Profiles must be applied and present on every controller that you intend to also apply the AP Group containing them to – or the action will fail for that controller.Once you assign an RF Profile to an AP Group you can not make changes to that RF Profile – Even if there are no AP’s assigned. The assumption is that there are or could be active AP’s assigned on the profile. You will receive an error –You must change the AP Group RF Profile settings to none in order to change the RF Profile – then add it back to the AP Group.You can also work around this restriction by disabling the network that will be affected by the changes you will be making – either a or b.You can assign the same RF Profile to more than one AP Group – just as you can a WLANWithin the AP Group – changing the assignment of an RF Profile on either band causes the AP to reset (re-boot) – you will be warned.You can not delete an RF Profile that is applied to an AP GroupYou cannot delete an AP Group that has AP’s assigned to it.
20 RF Profiles – Verification via CLI Display RF Profiles present on this controller:(Cisco Controller) >show rf-profile summary Number of RF Profiles RF Profile Name Band Description NCS_HD_a GHz HD configs for a NCS_HD_b GHz HD config for b test GHz test test GHz test3
21 RF Profiles – Creation/Configuration via CLI Display detailed information about a specific RF Profile:(Cisco Controller) >show rf-profile details NCS_HD_a Description HD configs for a Radio policy GHz Transmit Power Threshold v dBm Transmit Power Threshold v dBm Min Transmit Power dBm Max Transmit Power dBm a Operational Rates a 6M Rate Mandatory a 9M Rate Supported a 12M Rate Mandatory a 18M Rate Supported a 24M Rate Mandatory a 36M Rate Supported a 48M Rate Supported a 54M Rate Supported
22 RF Profiles – Creation/Configuration via CLI Show configured AP Groups – and which RF Profiles have been applied:(Cisco Controller) >show wlan apgroupsTotal Number of AP GroupsSite Name default-groupSite Description <none>RF Profile2.4 GHz band <none>5 GHz band <none>WLAN ID Interface Network Admission Control Radio Policymanagement Disabled Nonemanagement Disabled Nonevlan Disabled NoneAP Name Slots AP Model Ethernet MAC Location Port Country PriorityAP0022.bd18.da AIR-CAP3502E-A-K :22:bd:18:da:96 default location USAP0022.bd18.ab AIR-CAP3502E-A-K :22:bd:18:ab:11 default location USAP0022.bd18.87c AIR-CAP3502E-A-K :22:bd:18:87:c0 default location USAP0022.bd18.a AIR-CAP3502E-A-K :22:bd:18:a6:42 default location US <SNIP>
23 RF Profiles – Creation/Configuration via CLI <SNIP>Site Name Test3Site Description Test3Venue Name Not configuredVenue Group UnspecifiedVenue Type UnspecifiedLanguage Code Not configuredRF Profile2.4 GHz band <none>5 GHz band Test3WLAN ID Interface Network Admission Control Radio Policymanagement Disabled NoneAP Name Slots AP Model Ethernet MAC Location Port Country Priority
24 RF Profiles – Creation/Configuration GUI From the Controller GUI selectWireless=>RF ProfilesSelect “New”, this opens the profile creation dialogueIn order to crate a profile you will assign a name to the profile and select the band that you wish to create it forSelect Apply, and the profile dialogue opens to allow customization of the power parameters
25 RF Profiles – Creation/Configuration GUI Add a descriptionSelect if required the minimum and/or Maximum TPC settings – the minimum or maximum power that the AP’s this profile is assigned to will be allowed to useSelect a custom TPC power threshold for either Version 1 or Version 2 of TPC
26 RF Profiles – Creation/Configuration GUI Select ApplySelect the data rates to be applied to the AP’s you will select to have this profile
27 RF Profiles – Creation/Configuration GUI To apply the newly created profiles to groups of AP’s:Select WLANs=>Advanced=>AP GroupsSelecting the group – opens the configuration dialogueFor release 7.2 there are two new Tab’s added to the dialogue under AP Group
28 RF Profiles – Creation/Configuration GUI Select RF Profile screen to access the RF Profile configuration. You can select an RF Profile for each band, a/802.11b or you can select just one or none to apply through this groupNOTE: Until you select AP’s and add them to the new group – no configurations will take place and you can save the new group configuration as is. Once you select AP’s and apply, the process of moving the AP’s into the new group will reboot the AP’s and the configurations for the profiles will be applied.
29 RF Profiles – Creation/Configuration GUI Choose the APs tab and select the AP’s that you wish to have use the new RF profiles – keep in mind when configuring this that AP’s can not belong to two AP Groups at once.Select APs to addOnce you select the “Add APs” button in the upper right corner of the dialogue box. The following warning will be displayedThe process is the same for existing groups with release 7.2 controllersSelect OK to continue
30 RF Profiles – NCS Configuration Add Pats config slides here
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