According to the current IEEE 802.11e HCCA standard, if more than three video sessions are to be in service in a WSTA, some of them must share the TXOP because the number of TSIDs assigned to video transmission is two. In order to resolve the problem, we devise a method in which up to 15 video sessions can be accommodated by slightly modifying the frame structure while maintaining the compatibility with the current standard. Experimental results show that our method guarantees the transmission bandwidth requested by each video session.