8.59 Source Identification
29.2743GPP3GPP Evolved Packet System (EPS)Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C)Release 18Stage 3TS
The Source Identification information element is coded as depicted in Figure 8.59-1.
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Bits |
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Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
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1 |
Type = 129 (decimal) |
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2 to 3 |
Length = n |
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4 |
Spare |
Instance |
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5 to 12 |
Target Cell ID |
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13 |
Source Type |
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14 to (n+4) |
Source ID |
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Figure 8.59-1: Source Identification
The Target Cell ID shall be same as the Octets 3 to 10 of the Cell Identifier IEI in 3GPP TS 48.018 [34].
Source Type values are specified in Table 8.59-1.
If the Source Type is Cell ID, this indicates PS handover from GERAN A/Gb mode. In this case the coding of the Source ID field shall be same as the Octets 3 to 10 of the Cell Identifier IEI in 3GPP TS 48.018 [34].
If the Source Type is RNC ID, this indicates PS handover from GERAN Iu mode or for inter-RAT handover from UTRAN. In this case the Source ID field shall include a transparent copy of the corresponding parameter (see clause 8.2.2), the Source RNC-ID as specified within the "Source ID" parameter in 3GPP TS 25.413 [33].
NOTE: In fact, the ASN.1/PER encoded binary value of the "Source RNC ID" shall be copied into octets 14 to (n+4).
Table 8.59-1: Source Type values and their meanings
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Source Types |
Values (Decimal) |
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Cell ID |
0 |
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RNC ID |
1 |
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reserved (NOTE) |
2 |
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<spare> |
3-255 |
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NOTE: This value was allocated in an earlier version of the protocol and shall not be used. |
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