Method for managing the accessibility of an uplink channel, of the control channel and/or data channel type, for a communications network infrastructure with a plurality of pieces of radio equipment (SU1; SU2; SU3), in which the accessibility to the uplink channel is transmitted on a downlink channel of the network infrastructure to the pieces of radio equipment by means of status symbols indicating if access to the uplink channel is authorized during a timeslot. The method comprises: a receiving of a message on the uplink channel coming from a piece of radio equipment (SU1), the message comprising an indicator in order to indicate a length type of the message; a reading of the indicator indicating the type of length and when the message is of the long type: a determining of the length L of the message received using a processing of a header block; a determining of the number Nb of subsequent timeslots corresponding to the determined length L, and a modification of at least one status symbol of the Nb subsequent timeslots determined.