8.90 Additional MM context for SRVCC
29.2743GPP3GPP Evolved Packet System (EPS)Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C)Release 18Stage 3TS
The additional MM Context for SRVCC information element contains mobile station classmarks, supported codec list that are necessary for the AMF/MME/S4-SGSN to perform SRVCC as defined in 3GPP TS 23.216 [43]. The coding of Mobile Station Classmarks and Supported Codec List fields include the IE value part as it is specified in 3GPP TS 24.008 [5].
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Bits |
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Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
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1 |
Type = 159 (decimal) |
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2 to 3 |
Length = n |
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4 |
Spare |
Instance |
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5 |
Length of the Mobile Station Classmark 2 |
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6 to a |
Mobile Station Classmark 2 |
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b |
Length of the Mobile Station Classmark 3 |
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(b+1) to c |
Mobile Station Classmark 3 |
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d |
Length of the Supported Codec List |
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(d+1) to e |
Supported Codec List |
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(e+1) to (n+4) |
These octet(s) is/are present only if explicitly specified |
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Figure 8.90-1: Additional MM context for SRVCC
For each of the Mobile Station Classmark 2, Mobile Station Classmark 3 and Supported Codec List parameters, if they are not available, then the associated length field shall be set to zero, and the particular parameter field shall not be present.