Content for TS 24.007 Word version: 18.2.0
11 L3 Messages
11.1 General
11.2 Standard L3 messages
11.3 Non standard L3 messages
11.4 Handling of superfluous information
11 L3 Messages p. 98
11.1 General p. 98
11.1.1 Messages p. 98
11.1.2 Octets p. 99
11.1.3 Integer p. 99
11.1.3.1 Binary p. 99
11.1.3.2 2-complement binary p. 99
11.1.4 Spare parts p. 99
11.2 Standard L3 messages p. 100
11.2.1 Components of a standard L3 message p. 100
11.2.2 Description methods for IE structure p. 103
11.2.2.1 Tables p. 103
11.2.2.1.1 Compact notation p. 104
11.2.3 Imperative part of a standard L3 message p. 104
11.2.3.1 Standard L3 message header p. 104
11.2.3.1.1 Protocol discriminator p. 105
11.2.3.1.1A Extended protocol discriminator (EPD) |R15| p. 105
11.2.3.1.2 Skip indicator p. 106
11.2.3.1.3 Transaction identifier p. 106
11.2.3.1.4 Sub-protocol discriminator p. 108
11.2.3.1.5 EPS bearer identity |R8| p. 108
11.2.3.1.6 Security header type |R8| p. 109
11.2.3.1a Procedure transaction identity |R8| p. 109
11.2.3.1b PDU session identity |R15| p. 109
11.2.3.2 Message type octet p. 110
11.2.3.2.1 Message type octet (when accessing Release 98 and older networks only) p. 110
11.2.3.2.2 Message type octet (when accessing Release 99 and newer networks) p. 111
11.2.3.2.3 Sequenced message transfer operation p. 112
11.2.3.3 Standard information elements of the imperative part p. 114
11.2.4 Non-imperative part of a standard L3 message p. 114
11.2.5 Presence requirements of information elements p. 116
11.2.6 Description of standard L3 messages p. 116
11.3 Non standard L3 messages p. 117
11.3.1 Case A: BCCH and AGCH/PCH messages p. 117
11.3.1.1 L2 Pseudo Length octet p. 117
11.3.1.2 Rest Octets p. 117
11.3.1.3 Description of a modified standard L3 message p. 118
11.3.2 Case B: SACCH / SDCCH / FACCH messages sent in unacknowledged mode p. 118
11.3.2.1 The first octet p. 118
11.3.2.2 The rest of the message p. 118
11.3.3 Design guidelines for non standard parts p. 118
11.3.3.1 General p. 118
11.4 Handling of superfluous information p. 119
