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Feature #2591
closedramp up cell slowly based on access control class to avoid severe RACH/SDCCH overload
Start date:
10/23/2017
Due date:
% Done:
0%
Spec Reference:
Description
When a cell is enabled in presence of many (e.g. 10k) phones and no other network around, the network is severely overloaded. We should implement a variety of ramping mechanisms to slowly grow the cell. This includes
- ramping of transmit power (pretty useless in case of active antenna distribution system)
- ramping of access control classes (SIMs are assumed to have equal statistic distribution over all ACC)
- ramping of "rxlev access min"
- some generic ramping code that increments/decrements a certain value
- the existing TX power ramping code of osmo-bts can be used as a template?
- parameter-specific code that uses the generic code/api for the specific parameter
- vty parameters to configure the ramping in terms of
- initial value
- maximum (normal) value
- step size
- delay between steps
- should all ramps execute concurrently?
- should they execute after each other? If yes, how do we trigger that?
Furthermore, aside the static ramping based on a timer, it would be great to be able to have a feedback loop that automatically runs those ramps using RACH / SDCCH load as input to the feedback loop. If theres no/low load, ramp fast. If load is high, ramp slower. Care must be taken not to completely stall any progress under high load.
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