1. TSG-RAN Workshop on Radio mobility MOB-070002
with non-3GPP radio technologies
28th May 2007, Busan, Korea
Improved network controlled mobility with non-3GPP radio technologies –mobility scenarios and requirements
Agenda Item: 5. (Non-3GPP/3GPP mobility scenarios and requirements - operators)
Source: Telecom Italia, China Mobile
Document for: Discussion

2. Background and assumptions
The mobility scenarios of interest are for a limited number of non 3GPP radio access technologies, such as mobile WiMAX, 3GPP2 and WLAN
Scope of the Workshop to identify which ones (limited set)
The decisions regarding handover are taken by the network (with UE assistance) but not by the terminal alone
Core Network
The operator deployed a Evolved Packet Core (EPC) Network encompassing both 3GPP and non-3GPP accesses
service control is based on Common IMS
The mobility scenario of interest is relevant to real time services (e.g., videostreaming) and therefore the interruption time should be minimised
The RAN Study Item should identify potential solutions, their impact on specification and equipment implementation and propose viable solutions to minimise the delay
Solutions developed for intra 3GPP mobility should be reused as much as possible

3. Scenario description: non-3GPP hotspot in a 3GPP access coverage
In this scenario, nation wide coverage is provided by 3GPP networks
Non-3GPP(e.g., mobile WiMAX) is deployed in hot spots (e.g., corporate buildings, campuses) for capacity reasons
The operator deployed a Evolved Packet Core (EPC) Network encompassing both 3GPP and non-3GPP accesses
EPC
non-3GPP
hotspot
(e.g., mobile
WiMAX)
3GPP RAT (HSPA and/or LTE)

4. Scenario #1: description
Non-3GPP provides coverage in limited areas, requiring high bit rates and with high data traffic penetration
The coverage of the city is provided by 3GPP
PS to PS service continuity is the main scope
Seamless service continuity is required for conversational and real time services (e.g. VoIP, videostreaming, videosharing)
The user could move out of non-3GPP coverage and then be back

5. Scenario #1: handover direction
In this scenario, the essential handover direction is from non-3GPP to 3GPP, due to coverage issues
The mobility between non-3GPP and 3GPP shall be addressed
When a user comes back into non-3GPP coverage, the mobility between 3GPP access and non-3GPP could be required
This issue could be subject to more investigation during the Study Item phase, in order to evaluate the impact on the different radio technologies
From the operator’s perspective it could be desirable to define also this scenario

6. Scenario #1: requirements and technical issues
Idle mode mobility shall be supported in both directions
In order to provide a seamless service continuity to the user, the interruption time shall be on the order of that defined within 3GPP access, i.e. session continuity is not enough.
The RAN Study Item should identify potential solutions, their impact on specification and equipment implementation and propose viable solutions to minimise the delay
The decisions regarding handover are taken by the network (with UE assistance) but not by the terminal alone
The following aspects should be analysed in the Study Item
Measurement configuration, detection and reporting of 3GPP cells during connection to non-3GPP radio access
Role of UE, Radio access networks and EPC
Signalling options between non-3GPP RAN, E-UTRAN and EPC
Operations with single radio and dual radio UE (single radio preferred)

7. Scenario #2: non-3GPP hot spots in a discontinuous 3GPP coverage
In this scenario, the operator deploys non-3GPP (e.g., mobile WiMAX) hot spots where no 3GPP (LTE and/or HSPA) macro coverage is available (e.g. indoor )
EPC
3GPP RAT (HSPA and/or LTE)
Non-3GPP hot spot (e.g., mobile WiMAX)

8. Scenario #2: description
Non-3GPP provides coverage in specific areas (e.g. private building), aiming at providing high bit rates and with high data traffic mainly in indoor and in the neighbourhood
The coverage of the city is provided by 3GPP (e.g., HSPA)
PS to PS service continuity is the main scope
Seamless service continuity is required for conversational and real time services (e.g. VoIP, videostreaming, videosharing)
The user could move out of non-3GPP coverage and then be back

9. Scenario #2: Handover direction
In this scenario, both handover directions are possible
When a user moves from outdoor to indoor, handover from 3GPP to non-3GPP shall be supported in order to ensure service continuity
The mobility for both directions shall be addressed
In the Study Item phase, to evaluate the impact on the different radio technologies

10. Scenario #2: requirements and technical issues
Idle mode mobility shall be supported in both directions
In order to provide a seamless service continuity to the user, the interruption time shall be on the order of that defined within 3GPP access, i.e. session continuity is not enough.
The RAN Study Item should identify potential solutions, their impact on specification and equipment implementation and propose viable solutions to minimise the delay
The decisions regarding handover are taken by the network (with UE assistance) but not by the terminal alone
The following aspects should be analysed in the Study Item
Measurement configuration, detection and reporting of 3GPP cells from non-3GPP radio access AND of non-3GPP cells from 3GPP radio access
Role of UE, Radio access networks and EPC
Signalling options between non-3GPP RAN, E-UTRAN and EPC
Operations with single radio and dual radio UE (single radio preferred)