A mobile radio communications device for use in a mobile radio communications network and arranged for delivering a non-synchronized random access preamble (10; 16), wherein the non-synchronized random access preamble (10; 16) has a multi-bit structure including Cause ID bits (12; 18) and selective bits, said selective bits including at least signature bits (14; 20) for collision avoidance, said device comprising means arrange to vary content structure of said selective bits responsive to signaling received from the network, wherein the signaling indicates four Channel Quality Indication 'CQI' inclusion schemes for Handover type, Initial Access type, Scheduling Request type and Uplink Synchronization type, and arranged to control said content structure such that: when the signaling indicates a first inclusion scheme, not to include CQI bits in said selective bits and only to include Random ID bits for collision avoidance for Handover type random access preamble, and to include CQ1 bits and the Random ID bits in said selective bits for other types of random access preambles; when the signaling indicates a second inclusion scheme, not to include CQI bits in said selective bits and only to include Random ID bits for collision avoidance for Initial Access type random access preamble, and to include CQI bits and the Random ID bits in said selective bits for other types of random access preambles; when the signaling indicates a third inclusion scheme, not to include the CQI bits in said selective bits and only to include Random ID bits for collision avoidance for Scheduling Request type random access preamble, and to include CQI bits and the Random ID bits in said selective bits for other types of random access preambles; and when the signaling indicates a fourth inclusion scheme, not to include CQI bits in said selective bits and only to include Random ID bits for collision avoidance for Uplink Synchronization type random access preamble, and to include CQI bits and the Random ID bits in said selective bits for other types of random access preambles. when the signaling indicates a first inclusion scheme, not to include CQI bits in said selective bits and only to include Random ID bits for collision avoidance for Handover type random access preamble, and to include CQ1 bits and the Random ID bits in said selective bits for other types of random access preambles; when the signaling indicates a second inclusion scheme, not to include CQI bits in said selective bits and only to include Random ID bits for collision avoidance for Initial Access type random access preamble, and to include CQI bits and the Random ID bits in said selective bits for other types of random access preambles; when the signaling indicates a third inclusion scheme, not to include the CQI bits in said selective bits and only to include Random ID bits for collision avoidance for Scheduling Request type random access preamble, and to include CQI bits and the Random ID bits in said selective bits for other types of random access preambles; and when the signaling indicates a fourth inclusion scheme, not to include CQI bits in said selective bits and only to include Random ID bits for collision avoidance for Uplink Synchronization type random access preamble, and to include CQI bits and the Random ID bits in said selective bits for other types of random access preambles.