A wireless WiMAX based communication system comprising: - a plurality of customer-premises equipment - the customer-premises equipment in the following denoted by CPE - for sending and receiving wireless signals in a first communication standard using time division multiplexing TDM, each of said CPE having a unique MAC address; - a base station having a wireless port for sending and receiving wireless signals to each of the plurality of CPE in the first communication standard and using TDM, - at least one CPE having one or more electronic devices associated therewith, wherein each electronic device has a MAC address uniquely identifying itself and the one or more electronic devices communicate with their associated CPE by using a second communication standard selected from the group of wired communication standards consisting of IEEE 802.3 Ethernet or IEEE 802.1Q VLAN Tagging; - said base station having stored therein a look-up table containing - MAC addresses of each of the plurality of CPE, - a group identifier for each CPE uniquely identifying a group of CPE, wherein any one of the plurality of CPE is configured to act as an originating CPE and to uplink a multicast message to the base station to be sent to a group of CPE, being a subset of the plurality of the CPE and the electronic devices via their associated CPE; - the originating CPE is configured to specify a predefined group of CPE by placing a corresponding group identifier in the uplink multicast message; and - in response to receiving the uplink multicast message the base station - is configured to convert the uplink multicast message to a downlink multicast message using the look-up table stored at the base station and the base station - is configured to transmit the downlink multicast message to the group of the CPE identified by the group identifier and said group of the CPE having their MAC addresses stored in the look-up table and identified in the uplink multicast message. - a plurality of customer-premises equipment - the customer-premises equipment in the following denoted by CPE - for sending and receiving wireless signals in a first communication standard using time division multiplexing TDM, each of said CPE having a unique MAC address; - a base station having a wireless port for sending and receiving wireless signals to each of the plurality of CPE in the first communication standard and using TDM, - at least one CPE having one or more electronic devices associated therewith, wherein each electronic device has a MAC address uniquely identifying itself and the one or more electronic devices communicate with their associated CPE by using a second communication standard selected from the group of wired communication standards consisting of IEEE 802.3 Ethernet or IEEE 802.1Q VLAN Tagging; - said base station having stored therein a look-up table containing - MAC addresses of each of the plurality of CPE, - a group identifier for each CPE uniquely identifying a group of CPE, - the originating CPE is configured to specify a predefined group of CPE by placing a corresponding group identifier in the uplink multicast message; and - in response to receiving the uplink multicast message the base station - is configured to convert the uplink multicast message to a downlink multicast message using the look-up table stored at the base station and the base station - is configured to transmit the downlink multicast message to the group of the CPE identified by the group identifier and said group of the CPE having their MAC addresses stored in the look-up table and identified in the uplink multicast message. - is configured to convert the uplink multicast message to a downlink multicast message using the look-up table stored at the base station and the base station - is configured to transmit the downlink multicast message to the group of the CPE identified by the group identifier and said group of the CPE having their MAC addresses stored in the look-up table and identified in the uplink multicast message.