October 2008doc.: IEEE 802.11-08/1212r0
IEEE P802.11
Wireless LANs
Date: 2008-09-28
Author(s):
Name / Company / Address / Phone / email
Joerg Swetina / 3GPP SA1 /
3GPP TSG-SA1 #41S1-082411
Sophia Antipolis, France, 21 - 25July 2008
Title:LS on Requesting recommendations on the IEEE 802.11u approach
Response to:Liaison to 3GPP SA and 3GPP SA2 requesting recommendations
Release:
Work Item:
Source:3GPP SA WG1
To:IEEE P802.11
Cc:3GPP SA , SA2, CT1
Contact Person:
Name:Joerg Swetina
Tel. Number:+49 177 3573041
E-mail Address:
Attachments:none
1. Overall Description:
3GPP SA1 would like to thank IEEE P802.11 for the LS "Liaison to 3GPP SA and 3GPP SA2 requesting recommendations" (S1-082176 = SP-082176), which had been forwarded by SA to SA1.
In that LS IEEE P802.11 drew the attention of 3GPP to the availability of a “generic container” for information that can be conveyed through the wireless LAN (WLAN) AP (access point) to mobile stations (MSs) that are capable of operating on IEEE 802.11 Wireless LAN. Information transported by this generic container would be defined by and provided by the cellular system, and in this case, by 3GPP.
IEEE 802.11 wished to make certain that the generic container meets 3GPP needs. Also, some clarifications were requested that would assist IEEE P802.11 in the completion of this amendment.
SA1 would like to answer on behalf of 3GPP SA some of the questions that were raised.
Other Technical Considerations (to be considered by SA)
- With IEEE 802.11u providing transport of a generic container through WLAN APs to MSs, what does 3GPP consider to be the maximum container size that would be required?
- Should larger size containers be necessary, may multiple transmissions be used to send them?
SA1's answer:
In TS 22.278 (Service requirements for the Evolved Packet System (EPS)), a potential use for a “generic container” for information, if provided by non-3GPP access networks, has been foreseen. In section 7.1.5 (Access network discovery) the following requirement can be found:
======TS 22.278 section 7.1.5 (Access network discovery) ======
…
When discovering non-3GPP accesses a UE shall be able to receive information from a non-3GPP access network concerning to which PLMN, or PLMNs, the non-3GPP access network provides access.
Note: The capability to provide such information by a non-3GPP access network is out of scope of 3GPP.
When a UE receives service via a non-3GPP access it shall be possible for the PLMN that provides the non-3GPP access to indicate local availability of 3GPP access to the UE, subject to capabilities of the non-3GPP access network.
======
The PLMN identity consists of 5 to 6 decimal digits encoded in BCD. The number of PLMN identities that need to be broadcasted can be in the order of a two to three hundreds (this is roughly the number of roaming agreements a PLMN has).
Regarding the particular questions on (a) maximum container size and (b) need for multiple transmissions SA1 does not consider itself in the position to be able to give an answer. 3GPP CT1 was also asked by SA to answer to IEEE original LS and may be in better position to provide a more detailed answer.
2. Actions:
Please take note of the above information.
3. Date of Next TSG-SA WG1 Meetings:
SA1#42 13 - 17 Oct 2008Seoul, Korea
SA1#42bis17 - 21 Nov 2008Miami, USA
Liaisonpage 1Adrian Buckley, 3GPP SA2