The BSSMAP protocol was extended to be able to negotiate per-call IP/Port To capture protocol traffic with Wireshark when connected via OsmoSTP use port. Handling of Abnormal Events Related to the BSSAP Header. MS are identified as DTAP by the Protocol Discriminator Information Element. BSSMAP-LE PERFORM LOCATION ABORT message. If the SMLC cannot proceed with positioning due to some protocol violation or error condition (e.g.
|Published (Last):||6 January 2012|
|PDF File Size:||18.83 Mb|
|ePub File Size:||14.6 Mb|
|Price:||Free* [*Free Regsitration Required]|
Direct transfer application part.
GSM Interfaces and Protocols (Global System for Mobile Communication (GSM)) Part 3
The radio link imposed some limitations, however, since the standard ISDN bit rate of 64 Kbps could not be practically achieved. See SS7 for a description of SS7 protocols. So two sets of protocols are used – Control Plane Protocols that control the calls and user plane protocols that carry the user’s data. UE User Equipment The phone or modem. The connection-oriented services are used for dedicated procedures such as handover and assignment procedures.
Please don’t pee in the pool. This message is sent to in response of a message which can not be treated correctly by the receiving entity and for which another failure message can not substitute. At the physical layer, it uses a 2-Mbps PCM30 prtocol. These prootocol are partially processed by the BSC to add necessary information required for other entities to process these requests. The data rates supported by GSM are bps, bps, bps, bps, and bps.
The most basic teleservice supported by GSM is telephony. Protocols The GSM protocol family consists of many protocols, and other protocols are conveyed on top of these. Powered by MoinMoin and Python. Figure shows this interface and protocol stack. TUP is an old protocol and may not be used in newer implementations.
GsmProtocolFamily – The Wireshark Wiki
For more protocols related to cellular protocols see prootcol following families: GSM, however, refers to more than just bxsmap “air interface”; it refers to the complete set of protocols.
The DTAP data is user information and carries messages related to call control and mobility management between two users, i. With CDMA, unique digital codes, rather than separate RF frequencies or channels, are used to differentiate subscribers. By the beginning ofthere were 1. MS Mobile Set The phone or modem.
Table lists local operation codes and their functions. This message is sent by an entity to its peer entity that it is using one or more circuit identity code which are unknown. It authenticates the user in the network.
A slave of the BSC from which it takes its configuration. The B interface is an internal interface and is not visible in most implementations. The primary difference is that access to the local exchange carrier LEC is provided via a wireless phone. Since each user is separated by a unique code, all users can share the same frequency band range of radio spectrum. Global System for Mobile communication GSM protocol family GSM is a technology for digital wireless telecommunications, represented by a decent number of specifications.
The messages are transparent to BSS except for a few exceptions. It employs a commercial adaptation of a military spread-spectrum technology. CDMA is a spread spectrum technology, which means that it spreads the information contained in a particular signal of interest over a much greater bandwidth than the original signal.
Figure shows the protocol stack used on these interfaces. For information on cellular and telecom protocol testing.
BSSAP – Wikipedia
Control Protocols IP Q. The GSM recommendations do not encourage the use of this interface and have not updated specifications for this interface pfotocol Release ISUP is used for both speech and data call setup. See the License page for details. One or more Kbps timeslots are used to carry signaling information. Based on spread spectrum theory, it gives essentially the same services and qualities as wireline service.
The codes are shared by both the mobile station cellular phone and the base station, and are called pseudo-random code sequences. Is in charge of the radio part.
Request to start a trace of a single connection. The digital nature of GSM allows data, both synchronous and asynchronous data, to be transported as a bearer service to or from an ISDN terminal. MAP relies on TCAP capabilities to establish non-circuit-related communication between two entities in the signaling network to exchange data and control information. The acronym was preserved but a new, English meaning was given to it later, once the potential of the technology was understood.
EIR Equipment Information Registry Keeps track of Mobile Phones; it could be used to find stolen equipment if operators were forced to use it they make plenty of money out of calls made from stolen phones so they won’t do it unless forced. The HLR contains such data as bssmao current roaming, redirection, and special services settings. CDMA has been used in many military applications, such as:.
BSS management application part.