The invention discloses a mobile station (200), a base station (300), a method and a computer program for communication in a wireless communication network (100), where cell edge user experiencing difficulties on the contention-based channel are treated differently than those users who are not power limited and/or do not experience collisions. Suggested solutions to this problem may be different treatment of the cell edge users in contrast to users located closer to the base station (300) either by communication over an orthogonal scheduled channel, or by forcing mobile stations (200) who have successfully sent their data to wait a specific time period or by dividing the mobile stations (200) into different groups based on the signal attenuation experienced by the different mobile stations (200).