Ue Identity And Location Information Support; Ue Identity Information Support; Ue Location Information Support - Cisco ASR 5000 Administration Manual
Enhanced wireless access gateway
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Also See for ASR 5000:
- Administration manual (466 pages) ,
- Installation manual (294 pages) ,
- Installation procedure (8 pages)
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Enhanced Wireless Access Gateway Overview
UE Identity and Location Information Support
The eWAG supports sending UE identity and location information to the GGSN, which the GGSN can use for Lawful
Intercept support.
UE Identity Information Support
The eWAG receives UE identity information from the Wi-Fi AAA in the optional "SN-WLAN-UE-Identifier" AVP
included in Accounting-Start/Accounting-Interim message from the WLC. The eWAG encodes the UE identity
information into IMEIsV IE of Create PDP Context. The UE identity information is composed of the UE's MAC
address in the "Calling-Station-Id" AVP's format as per RFC 3580, that is the MAC address in ASCII format (upper
case only), with octet values separated by hyphens. For example, "00-10-A4-23-19-C0".
Important:
because the IMEIsV definition only allows values in the range of 0–9. While the MAC address hex values range from
0–F. TBCD encoding used for encoding IMEIsV on GTP allows the range 0–F. Also, when the UE MAC address is
encoded into IMEIsV in TBCD format, MAC address is encoded in the initial six bytes of IMEIsV IE. The last two
bytes get padded with FFFE in TBCD encoding. The last nibble is encoded as 0xE since if the ASR5000 GGSN
encounters F in the last nibble it drops the last byte considering it a filler. As all the 16 ASCII -hex characters have to be
sent to Gx, Gy, and CDR interfaces, the eWAG instead encodes the last two bytes as FFFE.
Important:
Therefore, UE Identity Information support is available only if eWAG uses the "starent" RADIUS dictionary, if not
eWAG will ignore the AVP.
UE Location Information Support
The eWAG receives the access point identity information from the Wi-Fi AAA in the optional "SN-WLAN-AP-
Identifier" AVP included in Accounting-Start message from the WLC. The eWAG encodes this access point identity
information into ULI IE of Create PDP Context. In Accounting-Interim, if a new AP identifier is provided it is sent to
the GGSN in ULI IE of Update PDP Context. The access point identity is composed of the Location Area Code Cell
Identity (LAC_CI) — that is, Location Area Code (LAC) and Cell Id (CI) separated by an underscore. For example, if
the access point is assigned LAC = 123 and CI = 56789, then SN-WLAN-AP-Identifier AVP will contain 123_56789.
Important:
Therefore, UE Location Information support is available only if eWAG uses the "starent" RADIUS dictionary, if not
eWAG will ignore the AVP.
OL-28188-02
Note that eWAG's encoding of the UE MAC address into IMEIsV is not standards based. This is
Note that the "SN-WLAN-UE-Identifier" AVP is available only in the "starent" RADIUS dictionary.
Note that the "SN-WLAN-AP-Identifier" AVP is available only in the "starent" RADIUS dictionary.
Cisco ASR 5000 Enhanced Wireless Access Gateway Administration Guide ▄
Feature Description ▀
17
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