A method, comprising: generating at a radio link control subsystem a first message indicating that data is ready for transmission on an uplink, without including the data that is ready for transmission; initiating a procedure in a Layer 1 (LI) subsystem to acquire an uplink communication resource in response to said first message; receiving at a medium access control subsystem a second message from said L1 subsystem indicating failure to acquire said uplink communication resource; and characterized by : in response to said second message, generating at said medium access control subsystem a third message for said radio link control subsystem, which third message indicates a successful acquisition of said uplink communication resource, and, in response to which said radio link control subsystem sends a protocol data unit and starts one or more timers that the radio link control subsystem is configured to start when sending a protocol data unit; dropping said protocol data unit at said medium access control subsystem; and upon expiry of said one or more timers, generating at said radio link control subsystem another message indicating that data is ready for transmission, without including the data that is ready for transmission. generating at a radio link control subsystem a first message indicating that data is ready for transmission on an uplink, without including the data that is ready for transmission; initiating a procedure in a Layer 1 (LI) subsystem to acquire an uplink communication resource in response to said first message; receiving at a medium access control subsystem a second message from said L1 subsystem indicating failure to acquire said uplink communication resource; and characterized by : in response to said second message, generating at said medium access control subsystem a third message for said radio link control subsystem, which third message indicates a successful acquisition of said uplink communication resource, and, in response to which said radio link control subsystem sends a protocol data unit and starts one or more timers that the radio link control subsystem is configured to start when sending a protocol data unit; dropping said protocol data unit at said medium access control subsystem; and upon expiry of said one or more timers, generating at said radio link control subsystem another message indicating that data is ready for transmission, without including the data that is ready for transmission. in response to said second message, generating at said medium access control subsystem a third message for said radio link control subsystem, which third message indicates a successful acquisition of said uplink communication resource, and, in response to which said radio link control subsystem sends a protocol data unit and starts one or more timers that the radio link control subsystem is configured to start when sending a protocol data unit; dropping said protocol data unit at said medium access control subsystem; and upon expiry of said one or more timers, generating at said radio link control subsystem another message indicating that data is ready for transmission, without including the data that is ready for transmission. <EOS>