7.7.109 STN-SR
29.0603GPPGeneral Packet Radio Service (GPRS)GPRS Tunnelling Protocol (GTP) across the Gn and Gp interfaceRelease 17TS
STN-SR is defined in 3GPP TS 23.003 [2]. STN-SR is transferred via GTP tunnels. The sending entity copies the value part of the STN-SR into the Value field of the STN-SR IE.
The STN-SR IE is coded as specified in Figure 7.7.109-1. Octet 4 contains the Nature of Address and Numbering Plan Indicator (NANPI) of the "AddressString" ASN.1 type (see 3GPP TS 29.002 [6]). Octets 5 to (n+3) contain the actual STN-SR (digits of an address encoded as a TBCD-STRING as in the "AddressString" ASN.1 type). For an odd number of STN-SR digits, bits 8 to 5 of the last octet are encoded with the filler "1111".
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Bits |
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Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
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|
1 |
Type = 209 (decimal) |
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|
2 to 3 |
Length = n |
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|
4 |
NANPI |
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|
5 |
Digit 2 |
Digit 1 |
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… |
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n+3 |
Digit m |
Digit (m-1) |
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Figure 7.7.109-1: STN-SR