Method and apparatus for uplink transmissions

A wireless transmit/receive unit (WTRU) comprising:

• a transceiver;
• a processor,
• wherein the transceiver and the processor are configured to cause the WTRU to:
• receive a radio resource control (RRC) message that provides information associated with a set of resource blocks for resource assignments for a plurality of WTRUs in a cell, wherein each resource block is a time-frequency orthogonal frequency division multiplex (OFDM) block of resources;
• process at least one resource block within the set of resource blocks for a resource assignment message for the WTRU, wherein the resource assignment message is associated with an uplink resource block assignment and a WTRU identity;
• and
• transmit one or more uplink signals over a resource associated with the resource assignment message in response to the resource assignment message indicating activation of the resource.

A base station comprising:

• a transceiver;
• a processor,
• wherein the transceiver and the processor are configured to cause the base station to:
• transmit a radio resource control (RRC) message that provides information associated with a set of resource blocks for resource assignments for a plurality of wireless transmit/receive units (WTRUs) in a cell, wherein each resource block is a time-frequency orthogonal frequency division multiplex (OFDM) block of resources and different WTRUs search at different resource blocks within the set of resource blocks for one or more resource assignment messages;
• transmit a resource assignment message to a WTRU, wherein the WTRU processes at least one resource block within the set of resource blocks for the resource assignment message and the resource assignment message is associated with an uplink resource block assignment and a WTRU identity;
• and
• receive one or more uplink signals from the WTRU over a resource associated with the resource assignment message in response to the resource assignment message indicating activation of the resource for the WTRU.