Last updated: December 3, 2008
This section is only applicable to the lab applications.
This section outlines in a very general sense, the test set's support for individual protocol layers, the procedures associated with them, and their respective messages. Messages not included here may be supported. Certain parameters of messages included here may not be supported.
The Link Access Procedure on the Dm channel (LAPDm) is the protocol for use by the data link layer on the radio interface. The frame structure and procedures for proper operation of the LAPDm are described in GSM 04.06.
This layer contains two functions: The Radio Link Control function provides a radio-solution-dependent reliable link. The Medium Access Control function controls the access signaling (request and grant) procedures for the radio channel, and the mapping of LLC frames onto the GSM physical channel. RLC/MAC is defined in GSM 04.60 for functions operating on the Packet Data Channel (PDCH), and in GSM 04.08 for functions operating on the CCCH (Common Control Channel).
Message | Reference | Supported |
---|---|---|
Packet Access Reject | 04.60/11.2.1 | Yes |
Packet Channel Request | 04.60/11.2.5 | No |
EGPRS Packet Channel Request | 04.60/11.2.5a | No |
Packet Queuing Notification | 04.60/11.2.15 | No |
Packet Resource Request | 04.60/11.2.16 | Yes |
Packet Uplink Assignment | 04.60/11.2.29 | Yes |
Yes |
Message | Reference | Supported |
---|---|---|
Packet Downlink Assignment | 04.60/11.2.7 | Yes |
Message | Reference | Supported |
---|---|---|
Packet TBF Release | 04.60/11.2.26 | Yes |
Message | Reference | Supported |
---|---|---|
Packet Paging Request | 04.60/11.2.10 | Yes |
Message | Reference | Supported |
---|---|---|
Packet Downlink Ack/Nack | 04.60/11.2.6 | Yes |
EGPRS Packet Downlink Ack/Nack | 04.60/11.2.6a | Yes |
Packet Uplink Ack/Nack | 04.60/11.2.28 | Yes |
Message | Reference | Supported |
---|---|---|
Packet Control Acknowledgment | 04.60/11.2.2 | Yes |
Packet Cell Change Failure | 04.60/11.2.3 | No |
Packet Cell Change Order | 04.60/11.2.4 | Yes |
Packet Downlink Dummy Control Block | 04.60/11.2.8 | Yes |
Packet Uplink Dummy Control Block | 04.60/11.2.8b | Yes |
Packet Measurement Report | 04.60/11.2.9 | Yes |
Packet Measurement Order | 04.60/11.2.9b | No |
Packet Mobile TBF Status | 04.60/11.2.9c | Yes |
Packet Enhanced Measurement Report | 04.60/11.2.9d | Yes |
Packet PDCH Release | 04.60/11.2.11 | No |
Packet Polling Request | 04.60/11.2.12 | Yes |
Packet Power Control/Timing Advance | 04.60/11.2.13 | Yes |
Packet PRACH Parameters | 04.60/11.2.14 | No |
Packet PSI Status | 04.60/11.2.17 | Yes |
Packet Timeslot Reconfigure | 04.60/11.2.31 | Yes |
Logical Link Control (LLC): LLC was designed to be independent of the underlying radio interface protocols in order to allow introduction of alternative GPRS radio solutions with minimum changes to the NSS (Network Subsystem). The procedures for the LLC layer are described in GSM 04.64.
GPRS Mobility Management and Session Management (GMM/SM): This protocol supports mobility management functionality such as GPRS attach, GPRS detach (also applicable to the test application), security, routing area update, location update, PDP context activation, and PDP context deactivation. GMM/SM is defined in GSM 04.08
Message | Reference | Supported |
---|---|---|
Attach Request | 9.4.1 | Yes |
Attach Accept | 9.4.2 | Yes |
Attach Complete | 9.4.3 | Yes |
Attach Reject | 9.4.4 | Yes |
Detach Request | 9.4.5 | Yes |
Detach Accept | 9.4.6 | Yes |
P-TMSI Reallocation Command | 9.4.7 | No |
P-TMSI Reallocation Complete | 9.4.8 | No |
Authentication and Ciphering Request | 9.4.9 | No |
Authentication and Ciphering Response | 9.4.10 | No |
Authentication and Ciphering Reject | 9.4.11 | No |
Identity Request | 9.4.12 | Yes |
Identity Response | 9.4.13 | Yes |
Routing Area Update Request | 9.4.14 | Yes |
Routing Area Update Accept | 9.4.15 | Yes |
Routing Area Update Complete | 9.4.16 | Yes |
Routing Area Update Reject | 9.4.17 | No |
GMM Status | 9.4.18 | No |
GMM Information | 9.4.19 | Yes |
Messages | Reference | Supported |
---|---|---|
Activate PDP Context Request | 9.5.1 | Yes |
Activate PDP Context Accept | 9.5.2 | Yes |
Activate PDP Context Reject | 9.5.3 | Yes |
Request PDP context Activation | 9.5.4 | Yes |
Request PDP context Activation Reject | 9.5.5 | No |
Modify PDP context Request | 9.5.6 | No |
Modify PDP context Accept | 9.5.7 | No |
Deactivate PDP context Request | 9.5.8 | Yes |
Deactivate PDP context Accept | 9.5.9 | Yes |
Activate AA PDP context Request | 9.5.10 | No |
Activate AA PDP context Accept | 9.5.11 | No |
Activate AA PDP context Reject | 9.5.12 | No |
Deactivate AA PDP context Request | 9.5.13 | No |
Deactivate AA PDP context Accept | 9.5.14 | No |
SM Status | 9.5.15 | No |
This observation point captures the messages exchanged between the LLC layer and the SMS sub-layers. See SMS Logging Control for more information.
GSM Layer 3 (GSM L3) is defined in GSM 04.08. GSM L3 includes messages that are transmitted over the Common Control Channels. These are:
CCCH messages are useful mainly for the purpose of verifying correct channel allocation through the logging of RACH accesses and the related assignments. Note that the System Information Messages will only be visible whenever changes are made to the base station parameters. They are no continuously logged, although they are continuously broadcast on the BCCH.
All references in this section are relative to GSM 04.08 or GSM 04.60.
Message | Reference | Supported |
---|---|---|
Location Updating Request | 04.08/9.2.15 | Yes |
Location Updating Accept | 04.089.2.13 | Yes |
Channel Request | 04.08/9.1.8 | Yes |
Immediate Assignment | 04.08/9.1.18 | Yes |
Packet System information 1 | 04.60/11.2.18 | Yes |
Packet System information 13 | 04.60/11.2.25 | Yes |
Packet System information 2 | 04.60/11.2.19 | Yes |
Packet System information 3 | 04.60/11.2.20 | Yes |
Packet System information 3bis | 04.60/11.2.21 | Yes |
Subnetwork Dependent Convergence Protocol (SNDCP): This transmission functionality maps network-level characteristics onto the characteristics of the underlying network. SNDCP is specified in GSM 04.65.
Message | Reference | Supported |
---|---|---|
SN-DATA | 7.2 | Yes |
SN-UNITDATA | 7.2 | Yes |
SNDCP-XID | 6.8 | Yes |
Unlike most of the other protocols, IP only has a single type of message: the datagram. For each datagram, the IP header fields will be displayed by name and the user data will be displayed as a hex dump.
For each datagram, the following fields will be displayed:
For a more detailed explanation of these fields, refer to the Internet Engineering Task Force (IETF) document RFC 791.
The Radio Link Protocol (RLP) stack layer provides reliable transportation of data between the mobile station and the PPP layer by using a Frame Check Sequence (FCS) for error detection and providing for retransmission of corrupted or missing data. RLP is specified in GSM 04.22.
Observing the messages set and received by this layer is only useful if you are using GSM data channels in non-transparent mode. See GSM Circuit Switched Data (CSD) for more information.
The Point-to-Point Protocol (PPP) is associated with data channels. It allows a mobile station to transfer IP packets to and from the IP layer. PPP is specified in the Internet Engineering Task Force (IETF) document RFC 1548.
For more information about data channel support in the test set, see Data Channel .
The PPP High Level Data Link Control observation point provides access to the full PPP frame that is sent or received by the test set. Some header and footer octets are removed from the frame displayed in the PPP observation point. The additional octets viewable in the PPP HDLC layer are:
See RRLP Configuration for more information about the RRLP layer support in the test set.