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3GPP use of the TGu Interworking with External Networks

3GPP use of the TGu Interworking with External Networks. Authors:. Date: 2008-11-07. Abstract. This describes the inclusion of the IEEE 802.11u D-3.0 in 3GPP TS 24.234, and the interest of other 3GPP groups in making use of the Interworking with External Networks capability.

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3GPP use of the TGu Interworking with External Networks

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  1. 3GPP use of the TGu Interworking with External Networks Authors: Date: 2008-11-07 George Bumiller, Research In Motion

  2. Abstract This describes the inclusion of the IEEE 802.11u D-3.0 in 3GPP TS 24.234, and the interest of other 3GPP groups in making use of the Interworking with External Networks capability. The 3GPP TS covers the use of the capability, and also specifies the contents and format of the ‘generic container’ that 3GPP will use. The objective of this presentation is provision of the details to ensure the inclusion of 3GPP in the draft, it having been removed in D_4.0 due to the delay in communications between 3GPP and IEEE 802.11. George Bumiller, Research In Motion

  3. Background IEEE 802.11 sent an LS to 3GPP in March (0417r2), asking for their comment on aspects of the .11u approach, and posing specific questions to aid TGu in their work on the draft. The LS was not promptly acted on by 3GPP SA2. When SA2 referred the LS to 3GPP CT1, they took up the matter, passing a CR which subsequently was incorporated in TS 24.234 (reference). However, the update to this TS occurred during the IEEE 802.11 September meeting. Our March LS also was forwarded by 3GPP SA to SA1. SA1 responded to us (08-1212), however, while SA1s response LS was timely, it did not reach IEEE 802.11 through appropriate channels, and was not posted (on Mentor) until after our September meeting. It is appropriate to include 3GPP in Table 43x as a Native query protocol info ID definition. We sent an LS to 3GPP, and 3GPP has now added the .11u approach to their TS (Technical Specification). It should not be removed, as .11 u D4.0 has done. George Bumiller, Research In Motion

  4. 3GPP Problem and Approach The original problem (for 3GPP I-WLAN UEs, i.e. non-AP STAs) is that they had to associate with each available AP in order to find an AP through which 3GPP cellular networks can be accessed. (This is described in TS 24.234 and other 3GPP TSs.) This very significantly adds to the time it takes for the UE to connect, through the AP, to the 3GPP network. Note that, in addition to association, the 3GPP UE (without .11u) must establish an IP network connection, which may take 500 ms, which is then followed by a 3GPP query. The .11u approach now provides a means, through use of action frames, to obtain information without association. This will very significantly reduce the time taken to obtain the information enabling the selection of the appropriate AP, through which to access the desired 3GPP network. George Bumiller, Research In Motion

  5. Speed of Access for non-AP STA (3GPP UE) By quickly identifying the target AP, the 3GPP UE can then associate with that selected AP and connect to the 3GPP network. The 3GPP UE will only need to associate with the selected AP. It does not have to associate with other APs that do not have the desired connectivity to the desired 3GPP network. This immediately provides faster access. For example, if the fifth AP provides access to the desired 3GPP network, the .11u approach provides a reduction of more than 2 seconds in the time to connect with the desired network: 4 (APs) x 500 ms (establishment of IP network connection) = 2 seconds Note that the association with each of the four APs will take longer than simply using action frames to determine their usability. This will add to the two second delay calculated above. In those situations where more than four APs must be checked, the time savings will be even greater. The environments that the non-AP STA (3GPP UE) operate in often have rapid fluctionations in coverage. Fastd connection to the desired AP and then to the 3GPP network is essential. George Bumiller, Research In Motion

  6. References 3GPP TS 24.234 V8.1.0 (2008-09); Technical Specification Group Core Network and Terminals; 3GPP System to Wireless Local Area Network (WLAN) interworking; WLAN User Equipment (WLAN UE) to network protocols; Stage 3 (Release 8) Liaison from 3GPP SA1 to IEEE 802.11; IEEE 802.11-08/1212r0; S1-082411; LS on Requesting recommendations on the IEEE 802.11u approach 11-08-1286-02-000u-3GPP-cellular-network-information.doc George Bumiller, Research In Motion

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