Packet assignment method, system and apparatus

The invention discloses a grouping assignation method, which comprises: a base station receives a marking information of a user station reported by the user station; according to the marking information, the base station assigns a group to the user station; and the base station returns a response message to the user station, through a mapping zone MAP of the response message corresponding to the user station grouping, the position of the user station corresponding to a control message is designated, by decoding the MAP of the response message, the user station obtains the corresponding control message, and according to the position of the control message, the grouping result is obtained. In the method, the user station is assigned with the group when accessing the network, and the control message corresponding to the user station is placed in the data zone of the corresponding group by the base station; the MAP of the group indicates the position of the control message; and when the user station obtains the control message of the user station from the corresponding data zone by decoding, the user station can know the group to which the control message belongs according to the data zone of the group where the control message is positioned corresponding to the user station.