A base station subsystem, BSS, configured to interact with a plurality of mobile stations (104 1, 104 2, 104 3, 104 4....104 n) and perform a procedure to improve an Access Grant Channel, AGCH, capacity, the BSS comprising: a processor; and a memory that stores processor-executable instructions where the processor interfaces with the memory and executes the processor-executable instructions to enable the following operations: broadcast a new system information, SI, to the plurality of mobile stations, where the new SI includes an indicator which indicates to the plurality of mobile stations that the BSS is configured to perform the procedure to improve the AGCH capacity, and where the content of the new SI is limited to providing this single indicator; receive at least one access request from at least one of the plurality of mobile stations (104 1 and 104 3), where the at least one request indicates that the at least one mobile station is requesting to establish an uplink Temporary Block Flow, TBF, to transmit a small data transmission, SDT, or an instant message transmission, IMT,; in response to the received at least one access request, send an immediate assignment message on the AGCH for the at least one mobile station, where the immediate assignment message includes static radio parameters and at least a portion of dynamic radio parameters which are to be used along with the static radio parameters by the at least one mobile station when establishing the uplink TBF to transmit the SDT or IMT; and send a remaining portion of the dynamic radio parameters in a message on a Packet Associated Control Channel, PACCH, to the at least one mobile station addressed by the immediate assignment message, where the remaining portion of the dynamic radio parameters are to be used by the at least one mobile station along with the static radio parameters and the portion of dynamic radio parameters included in the immediate assignment message when establishing the uplink TBF to transmit the SDT or IMT. a processor; and a memory that stores processor-executable instructions where the processor interfaces with the memory and executes the processor-executable instructions to enable the following operations: broadcast a new system information, SI, to the plurality of mobile stations, where the new SI includes an indicator which indicates to the plurality of mobile stations that the BSS is configured to perform the procedure to improve the AGCH capacity, and where the content of the new SI is limited to providing this single indicator; receive at least one access request from at least one of the plurality of mobile stations (104 1 and 104 3), where the at least one request indicates that the at least one mobile station is requesting to establish an uplink Temporary Block Flow, TBF, to transmit a small data transmission, SDT, or an instant message transmission, IMT,; in response to the received at least one access request, send an immediate assignment message on the AGCH for the at least one mobile station, where the immediate assignment message includes static radio parameters and at least a portion of dynamic radio parameters which are to be used along with the static radio parameters by the at least one mobile station when establishing the uplink TBF to transmit the SDT or IMT; and send a remaining portion of the dynamic radio parameters in a message on a Packet Associated Control Channel, PACCH, to the at least one mobile station addressed by the immediate assignment message, where the remaining portion of the dynamic radio parameters are to be used by the at least one mobile station along with the static radio parameters and the portion of dynamic radio parameters included in the immediate assignment message when establishing the uplink TBF to transmit the SDT or IMT. broadcast a new system information, SI, to the plurality of mobile stations, where the new SI includes an indicator which indicates to the plurality of mobile stations that the BSS is configured to perform the procedure to improve the AGCH capacity, and where the content of the new SI is limited to providing this single indicator; receive at least one access request from at least one of the plurality of mobile stations (104 1 and 104 3), where the at least one request indicates that the at least one mobile station is requesting to establish an uplink Temporary Block Flow, TBF, to transmit a small data transmission, SDT, or an instant message transmission, IMT,; in response to the received at least one access request, send an immediate assignment message on the AGCH for the at least one mobile station, where the immediate assignment message includes static radio parameters and at least a portion of dynamic radio parameters which are to be used along with the static radio parameters by the at least one mobile station when establishing the uplink TBF to transmit the SDT or IMT; and send a remaining portion of the dynamic radio parameters in a message on a Packet Associated Control Channel, PACCH, to the at least one mobile station addressed by the immediate assignment message, where the remaining portion of the dynamic radio parameters are to be used by the at least one mobile station along with the static radio parameters and the portion of dynamic radio parameters included in the immediate assignment message when establishing the uplink TBF to transmit the SDT or IMT.