11.2.0 Message format

04.603GPPGeneral Packet Radio Service (GPRS)Mobile Station (MS) - Base Station System (BSS) interfaceRadio Link Control / Medium Access Control (RLC/MAC) protocolRelease 1999TS

All RLC/MAC control messages, with the exception of the PACKET CONTROL ACKNOWLEDGEMENT message in access burst format (11-bit and 8-bit contents) and the PACKET CHANNEL REQUEST message, follow the same non-standard format (see 3GPP TS 04.07).

11.2.0.1 Downlink RLC/MAC messages

Downlink RLC/MAC control messages are received in RLC/MAC control block format. The different types of messages are distinguished by the MESSAGE_TYPE field.

< Downlink RLC/MAC control message > ::=

< MESSAGE_TYPE : bit (6) == 1 00001 > < Packet Access Reject message content > |

< MESSAGE_TYPE : bit (6) == 0 00001 > < Packet Cell Change Order message content > |

< MESSAGE_TYPE : bit (6) == 0 00010 > < Packet Downlink Assignment message content > |

< MESSAGE_TYPE : bit (6) == 0 00011 > < Packet Measurement Order message content > |

< MESSAGE_TYPE : bit (6) == 1 00010 > < Packet Paging Request message content > |

< MESSAGE_TYPE : bit (6) == 1 00011 > < Packet PDCH Release message content > |

< MESSAGE_TYPE : bit (6) == 0 00100 > < Packet Polling Request message content > |

< MESSAGE_TYPE : bit (6) == 0 00101 > < Packet Power Control/Timing Advance message content > |

< MESSAGE_TYPE : bit (6) == 1 00100 > < Packet PRACH Parameters message content > |

< MESSAGE_TYPE : bit (6) == 0 00110 > < Packet Queueing Notification message content > |

< MESSAGE_TYPE : bit (6) == 0 00111 > < Packet Timeslot Reconfigure message content > |

< MESSAGE_TYPE : bit (6) == 0 01000 > < Packet TBF Release message content > |

< MESSAGE_TYPE : bit (6) == 0 01001 > < Packet Uplink Ack/Nack message content > |

< MESSAGE_TYPE : bit (6) == 0 01010 > < Packet Uplink Assignment message content > |

< MESSAGE_TYPE : bit (6) == 1 00101 > < Packet Downlink Dummy Control Block message content > |

< MESSAGE_TYPE : bit (6) == 1 10001 > < PSI1 message content > |

< MESSAGE_TYPE : bit (6) == 1 10010 > < PSI2 message content > |

< MESSAGE_TYPE : bit (6) == 1 10011 > < PSI3 message content > |

< MESSAGE_TYPE : bit (6) == 1 10100 > < PSI3 bis message content > |

< MESSAGE_TYPE : bit (6) == 1 10101 > < PSI4 message content > |

< MESSAGE_TYPE : bit (6) == 1 10110 > < PSI5 message content > |

< MESSAGE_TYPE : bit (6) == 1 10000 > < PSI6 message content > |

< MESSAGE_TYPE : bit (6) == 1 11000 > < PSI7 message content > |

< MESSAGE_TYPE : bit (6) == 1 11001 > < PSI8 message content > |

< MESSAGE_TYPE : bit (6) == 1 10111 > < PSI13 message content > |

< MESSAGE_TYPE : bit (6) == 1 11010 > < PSI14 message content > |
< MESSAGE_TYPE : bit (6) == 1 11100 > < PSI3 ter message content > |
< MESSAGE_TYPE : bit (6) == 1 11101 > < PSI3 quater message content > |

< MESSAGE_TYPE : bit (6) == 1 11110 > < PSI15 message content >

! < Unknown message type : { bit (6) = < no string > } < Default downlink message content > > ;

The ‘Default downlink message contents’ consists of the Page Mode information and an unspecified bit string that expands to the end of the message.

< Default downlink message content > ::=

< PAGE_MODE : bit (2) >

bit (*) = < no string > ;

The encoding of the Page Mode information is defined in sub-clause 12.20.

11.2.0.2 Uplink RLC/MAC messages

Uplink RLC/MAC control messages, except those using the access burst formats, are received in the RLC/MAC control block format. The different types of messages are distinguished by the MESSAGE_TYPE field.

< Uplink RLC/MAC control message > ::=

< MESSAGE_TYPE : bit (6) == 000000 > < Packet Cell Change Failure message content > |

< MESSAGE_TYPE : bit (6) == 000001 > < Packet Control Acknowledgement message content > |

< MESSAGE_TYPE : bit (6) == 000010 > < Packet Downlink Ack/Nack message content > |

< MESSAGE_TYPE : bit (6) == 000011 > < Packet Uplink Dummy Control Block message content > |

< MESSAGE_TYPE : bit (6) == 000100 > < Packet Measurement Report message content > |

< MESSAGE_TYPE : bit (6) == 001010 > < Packet Enhanced Measurement Report message content > |

< MESSAGE_TYPE : bit (6) == 000101 > < Packet Resource Request message content > |

< MESSAGE_TYPE : bit (6) == 000110 > < Packet Mobile TBF Status message content > |

< MESSAGE_TYPE : bit (6) == 000111 > < Packet PSI Status message content > |

< MESSAGE_TYPE : bit (6) == 001000 > < EGPRS Packet Downlink Ack/Nack message content > |

< MESSAGE_TYPE : bit (6) == 001001 > < Packet Pause message content > |

< MESSAGE_TYPE : bit (6) == 001011 > < Additional MS Radio Access Capabilities message content>;

Messages using the access burst formats (11-bit and 8-bit formats) are defined in sub-clauses 11.2.2 and 11.2.5.