8.2.20 Redirect Information
29.2443GPPInterface between the Control Plane and the User Plane nodesRelease 17TS
Redirect Information is coded as depicted in Figure 8.2.20-1.
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Bits |
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|
Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
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|
1-2 |
Type = 38 (decimal) |
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|
3-4 |
Length = n |
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|
5 |
Spare |
Redirect Address Type |
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|
6-7 |
Redirect Server Address Length=a |
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|
8-(8+a-1) |
Redirect Server Address |
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|
p-(p+1) |
Other Redirect Server Address Length=b |
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(p+2)-(p+2+b-1) |
Other Redirect Server Address |
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|
m to (m+1) |
Redirect Port |
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|
s to (n+4) |
These octet(s) is/are present only if explicitly specified |
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Figure 8.2.20-1: Redirect Information
Redirect Address Type indicates the type of the Redirect Address. It shall be encoded as defined in Table 8.2.20-1.
Table 8.2.20-1: Redirect Address Type
|
Redirect Address Type |
Value (Decimal) |
|
IPv4 address |
0 |
|
IPv6 address |
1 |
|
URL |
2 |
|
SIP URI |
3 |
|
IPv4 and IPv6 addresses |
4 |
|
Port |
5 |
|
IPv4 address and Port |
6 |
|
IPv6 address and Port |
7 |
|
IPv4 and IPv6 addresses and Port |
8 |
|
Spare, for future use. |
9 to 15 |
The Redirect Server Address Length shall indicate the length of the Redirect Server Address.
The Redirect Server Address shall be encoded in UTF8String format and shall contain the address of the redirect server (e.g. HTTP redirect server, SIP server) with which the end user is to be connected, as specified in clauses 8.38 and 8.39 of IETF RFC 4006 [16].
If the Redirect Address type is set to "IPv4 and IPv6 address", the Redirect Information IE shall include an IPv4 address and an IPv6 address in the Redirect Server Address IE and Other Redirect Server Address.
The Redirection Address Type may be set to "Port", "IPv4 address and Port", "IPv6 address and Port", or "IPv4 and IPv6 addresses and Port" if the UP function has indicated its support of the RATP feature as specified in clause 8.2.25.
If the Redirect Address Type is set to Port, the Redirect Address Server Address shall not be present, the UP function shall keep the destination of IP address and only change the destination port to the port as indicated in Redirect Port field.
If the Redirect Address Type is set to "IPv4 address and Port", "IPv6 address and Port", or "IPv4 and IPv6 addresses and Port", the Redirect Address Server Address and Redirect Port shall be included. When Redirect Address Type is set to "IPv4 and IPv6 addresses and Port", the Other Redirect Server Address shall also be present.