Broadband wireless communications using multiple contention channels

A communication system comprising:

• a plurality of downstream transmission systems configured to transmit downstream wireless communications to an area having a plurality of sectors over a plurality of downstream channels to a plurality of users in the plurality of sectors;
• and
• a plurality of upstream receiver systems, wherein each of the plurality of upstream receiver systems is associated with one of the plurality of sectors and is configured to receive upstream wireless communications over a plurality of upstream channels from those of the plurality of users in the one of the plurality of sectors;
• wherein, for each of the plurality of sectors, the plurality of upstream channels associated with the sector comprises multiple contention channels and a plurality of bearer channels, wherein each of the multiple contention channels is associated with a separate group of the plurality of bearer channels;
• and
• wherein, for each of the plurality of sectors, the upstream receiver system associated with the sector is further configured to receive requests over each of the multiple contention channels, wherein each of the requests is for access to the group of the plurality of bearer channels associated with the one of the multiple contention channels carrying the request.