Mining revenue generally consists of two parts, (1) the block reward (current bitcoin block reward is 12.5 bitcoin) paid by the network to the miner and (2) the transaction fees paid by the users to the miner. So when a miner successfully finds a block they are awarded all of the transactions fees in that block + the reward from the network.
PPS+ was first introduced in the end of 2016 and can be thought of as a combination of the PPS and PPLNS payments.
- Miners are paid by the pool for each valid share that they submit to the pool (whether or not the pool finds a block)
- Miners are also paid a portion of the transaction fees that their pool finds based on a PPLNS method (only when the pool finds a block)
The combination of the two gives miners the stable and predictable payments of PPS, with an additional transaction fee payment based on the PPLNS calculation method.