In a 15 mins chart bank nifty has formed a pattern at the support which was very crucial. Basically is formed when there are buyers waiting at the lower area which faced the rejection and that acts as a support. When the upper resistance is broken it is assumed that it will go up untill the size of the pattern ( ) is not achieved.
Price range and levels are marked in the chart. Analyse it and ask me through comment if there is any doubt.
Buy when a 5 min candle sustain above the resistance of 34340 and make sure the next candle break the High of previous candle.
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See my previous analysis also.