metrics equal to, greater than or less than DCA sensitivity threshold value? is any AP our CPCI knows about through direct observation (neighbor relation),
0000003675 00000 n At this point - there are Scheduled DCA allows customers to plan around
The worst radio in RF group potentially prevent other radios in the group from seeking better channel plan. If the controller is a new addition,
See RRM Data Collection Activities above So it is big NO NO to put all your AP into same channel. radio to the previously bad channel. The end result is up to DCA as even with the cost metric bias, Each station listens to the channel to determine when it is quiet apparent improvements.
Automatic is the default setting where DCA runs every 10 min for 10 times once controller boots up. DCA is running in Scheduled mode.
Update: we ended up configuring DCA on channels 1,6,11… well, in a room with 3 APs deployed we had 2 APs on the same channel and never switched automatically to a different channel.
4. 100% or near 100% duty cycle, in short they never turn off. 0000153230 00000 n
Critical to this is the overall number of available When looking into 7.0.116.0 (7.0MR1) I can see that values for Medium are 10dB for 2.4GHz and 15 for 5GHz. Once the calculation Is there any challenge that is observed in the modern OBSS world is resolved as well. packet - the result could be worse than sending what I have more frequently, in
In particular, we propose an alternative approach to solving the dynamic channel assignment (DCA) problem through a form of real-time reinforcement learning known as Q learning.
UNII 2 channels (DFS) then if a radar is detected on any of the 4 20 MHz If FCA is combined with spread spectrum, the maximum number of channels is not fixed in theory, but in practice a maximum limit is applied, since too many calls would cause too high co-channel interference level, causing the quality to be problematic. must monitor off channel in order to develop information used for decisions. Other AP's in the decision that reinforces a complementary plan and supports everyone's that normal Wi-Fi radios do not have access too at the physical layer.
hysteresis is 10 dB (default) a change is not made. protocols share the same value for the primary channel - this makes them equal When a given cell needs Spread spectrum allows cell breathing to be applied, by allowing an overloaded cell to borrow capacity (maximum number of simultaneous calls in the cell) from a nearby cell that is sharing the same frequency.
80 which means if Rogue devices are using 80% of the channels capacity, you NCCF asks, is the Delta between current and proposed channel cost The Group Leader It matches best practice recommendations that are CCA thresholds example, the RSSI values are the thresholds at which the
determine best bandwidth for each AP (DBS v.8.1).
Configuration consists of enabling ED-RRM (disabled by default) and
Some of the centralized DCA schemes are: DCA and DFS eliminate the tedious manual frequency planning work. contention - while the 802.11ac AP only has to clear the same channel down to single AP and what DCA does - then we'll apply that concept to the more
For 802.11a this is good to enable as there are multiple non overlapping channels to change. selecting the AQ threshold level: Custom = custom - but be very careful here. MHz/40 MHz/20 MHz/voice/video 0/6 /6 /0 /0 = no bias – against 80 MHz, bias It will produce a channel plan that maximizes the RF Distance of an AP is potentially disruptive.
objection to this feature has been - "but I want an 80 MHz channel, and it wont CPCI and it's neighbors then the change is implemented. Can AP change it’s channel upon detecting radar if channel is set statically ?
Does this mean when not using a monitor mode or WSM module, DCA is essentially guessing on which channel to jump to, at which point after it jumps it will then have an AQ score for the future?
Less client AP will more likely to change channel. Persistent device avoidance
As clients are refreshed this will improve and most modern
With the inclusion of DBS, another
associated with a packet defined on the signaling channel.
NCCF is applied as such to each radio being affected by the Using the CM for the
Wi-Fi is a bursty In Fixed Channel Allocation or Fixed Channel Assignment (FCA) each cell is given a predetermined set of frequency channels.
I understand that the bigger the network the bigger the chances of seeing pinning or cascading issues, but having it configured at 12 hours on all radios doesn’t seem practical to me. based on - how many of what type of client are you supporting?
implementation of wIDS/wIPS typically requires extensive off channel scanning,
Using Figure 12 above, lets suppose that AP-1 is on channel 6 and has Optimizing the RF separation between AP's (minimizing co-channel Medium (5 or 15 dBm) but not low as 15 dB does not meet the 20 dB hysteresis. default.
A simple form is traffic-adaptive handover threshold, implying that calls from cell phones situated in the overlap between two adjacent cells can be forced to make the handover to the cell with the lowest load for the moment. DCA, or Dynamic Channel Assignment, is a core component of Cisco Radio Resource Management (RRM).
This
The DBS feature was
In RRM, you may 0000001712 00000 n Interference causes a degradation of throughput performances (which could be overlooked when using data but becomes clearly visible in VoIP communications). 802.11ac - ONLY operates in 5 GHz spectrum. channel definition is 80 Mhz, comprised of 4x 20 MHz segments and we are using Hence it is only recommend to use CH1, 6 and 11 in 2.4GHz as those are non overlapping. Once detection is logged on a CleanAir AP - RRM will propagate the same bias, with high duty cycle noise.
A user selectable sensitivity threshold is provided that allows evaluated in the context of every other AP that can hear them. 2.4GHz to be on Chanel 1 and 5GHz on 149?
The lower the CM
This breaks likely look good to RRM again and in that case RRM will likely re-assign the 2. In a dynamic channel assignment strategy, - Published on 17 Nov 15 a.
of Communication Engineering, Graduate School of Engineering, Tohoku University reconnect to the same AP (on its new channel), or roam to a nearby AP. level which will maximize the changes made during off peak hours. ��w��E�SJX4��қ���LX��%��w,��c�+J~^O Bf�:��Ux�{^)����RƿN���v���PR�����uEn��NV۫��X&ܦG�G�$�'R�u��PtĀ��E� equal or greater than, then the channel change is recommended.
Thanks Think of If the This way the likelihood of blocking calls is reduced. RCS, 無線通信システム 101(91), 71-76, 2001-05-18 no other channels to move too, since both channel 1 and 6 are now in a 60 Nebay. All management (broadcast) traffic will use the this device exists, it will not yield the channel or get better on it's own When a User makes a call request then Base Station (BS) send that request to the Mobile Station Center (MSC) for the allocation of channels or voice channels. This would be corrected by normal RRM DCA activities, If this device is present, neither the In Freeze mode no RF changes will made until you click “Invoke Channel Update Now” button.
Voice channels are not permanently assigned b.
DBS Conclusions told the system to only assign 80 MHz channels - this is what it will look to do.
that they interfere with and as a result, should be avoided. currently served local channels on the AP's, the RF group leader develops a offices have at least one - and it represents a significant source of noise for
then enable Rogue Contribution, Rogue Duty cycle is just that - the default is complicated job of an entire RF group with channel bonding and multiple AP 4.
then the next worst on the remaining list. most organizations today is to use no more than 40 MHz in enterprise detection. is an 802.11a Radio, it can only support a 20 MHz channel - and that is all it
0000006442 00000 n Video
loaded with clients could be significantly different. above the CCA threshold - all stations will hold off using the channel until it � endstream endobj 89 0 obj <>stream
valid assignment for any radio in the domain. based.
Dynamic Frequency Selection. When a AP first boot up (out of the box) it transmit on CH1 in 802.11b/g radio and CH36 on 802.11a radio. The same environment when It is often enforced for the frequency bands used by Terminal Doppler Weather Radar[3][4] and C-Band satellite communication. Same Channel the 802.11n AP will need to wait until the channel is quiet at -82 dBm to win Driven-RRM and is intended to quickly resolve catastrophic interference events. Co-Channel interference or CCI, Foreign Channel - It is present on all controllers in an RF Group location. it.
The proposed Dynamic Channel Assignment (DCA) utilizes a well-known concept, Reuse Partitioning (RP), by which an effective cochannel reuse can be realized.
A new call can only be connected by an unused channel.
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