8.59 Source Identification

29.2743GPP3GPP Evolved Packet System (EPS)Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C)Release 16Stage 3TS

The Source Identification information element is coded as depicted in Figure 8.59-1.

Bits

Octets

8

7

6

5

4

3

2

1

1

Type = 129 (decimal)

2 to 3

Length = n

4

Spare

Instance

5 to 12

Target Cell ID

13

Source Type

14 to (n+4)

Source ID

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

Source Types

Values (Decimal)

Cell ID

0

RNC ID

1

reserved (NOTE)

2

<spare>

3-255

NOTE: This value was allocated in an earlier version of the protocol and shall not be used.