BA window size (found under Wireless configuration > Advanced radio settings) specifies the size of the Block ACK window. Individual acknowledgements are transmitted after every MPDU packet. The BA window size value allows to acknowledge multiple MPDUs together as a single BA frame.
Block ACK has a bitmap size of 64×16 bits. If the level of interference is high, it is recommended to set the BA window size to 8 to reduce packet loss and the amount of retries. If the environment is clean, it is recommended to set the BA window size to 64 for maximum performance.
