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UDH uses space intended for the message payload. The longer the UDH, the less space remains for the message text or other contents. When TP-UD contains seven-bit data, the length of TP-UD is given in septets (but UDHL is still in octets, so length in septets is (UDHL + 1) * 8 / 7) and the UDH is filled to a septet boundary with 0-6 zero bits.
GSM 03.40 or 3GPP TS 23.040 is a mobile telephony standard describing the format of the Transfer Protocol Data Units (TPDU) part of the Short Message Transfer Protocol (SM-TP) used in the GSM networks to carry Short Messages. [1]
The length field is set to zero if the length of the UDP header plus UDP data is greater than 65,535. [9] Checksum: 16 bits The checksum field may be used for error-checking of the header and data. This field is optional in IPv4, and mandatory in most cases in IPv6. [10] Data: Variable The payload of the UDP packet.
In technical terms, the concatenated SMS could also be referred to as a PDU Mode SMS [dubious – discuss].The number of parts that a multi-part or PDU mode SMS message may contain depends technically upon a header message but mostly upon the device sending or receiving the SMS and also upon the service provider.
The form of encoding used to safely transfer the entity to the user. Currently defined methods are: chunked, compress, deflate, gzip, identity. Must not be used with HTTP/2. [14] Transfer-Encoding: chunked: Permanent RFC 9110: User-Agent: The user agent string of the user agent. User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko ...
Data Coding Scheme is a one-octet field in Short Messages (SM) and Cell Broadcast Messages (CB) which carries a basic information how the recipient handset should process the received message. The information includes:
The user data transported can be packets in any of IPv4, IPv6, or PPP formats. GTP' ( GTP prime ) uses the same message structure as GTP-C and GTP-U, but has an independent function. It can be used for carrying charging data from the charging data function (CDF) of the GSM or UMTS network to the charging gateway function (CGF).
Packet Data Convergence Protocol (PDCP) is specified by 3GPP in TS 25.323 [1] for UMTS, TS 36.323 [2] for LTE and TS 38.323 [3] for 5G. PDCP is located in the Radio Protocol Stack in the UMTS/LTE/5G air interface on top of the RLC layer.