Medium access control method in point-to-multipoint radio systems adopting peripheral stations with adaptive phy mode

Method for media access control in radio systems having a station (MS) centralized master connected to a plurality of stations (PS) capable of adaptive PHY mode through a channel (DL) descending divided in frequency from an upstream channel (UL) both subdivided in frames of the same duration, and the channel (UL) up being their shared time among all the peripheral stations (PS) enabled to transmit, to receive individual permissions of transmission, called grants, scheduled by the master station to meet the conditions of static momentary or dynamic traffic station determined by a filling status of queues within the peripheral stations (PS) associated with different groups (CA1, CA2, CA3 / 4) connection with different priority of service (CBR, VBRrt, VBRnrt, UBR +), characterized in that includes the steps of: - calculating in a current frame bandwidth necesariopara all peripheral stations enabled for each group (CA1, CA2, CA3 / 4) connection and store results for each group in a memory (table 1, 2, 3, 4) corresponding priority; - Explore, in turn, the memories of priority by Peripheral Station and by decreasing priority (table 1, 2, 3, 4) and accumulating relevant readings with respect to the same peripheral station on a map (Table 6) memory ascending, obtaining cumulative grants valid for a next frame expressed as the number of modulation symbols with PHY mode assigned, interrupting the scan at any time during the current frame when the number of modulation symbols achieves a maximum permissible for a frame.