EP2007161A1
Active / In Force
EP
⏱️ 0.6 years remaining
Non-3GPP access to 3GPP access inter-rat handover with resource preparation
Assignee: Motorola Mobility LLC
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Filing: 2007-06-18
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Granted: —
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Expires: 2027-06-18
Abstract
Abstract A pre-registration phase (800) and a resource preparation phase (900) reduce latency when a user equipment (UE) (210) hands over from a non-3GPP radio access (220) such as WiMAX to an 3GPP radio access network (230) such as E-UTRAN. During a pre-registration phase (800), a Forward Attachment Function (260) receives a pre-attach request message (833) and creates (860) a 3GPP mobility management context for the UE (210) that is valid for E-UTRAN access. During a resource preparation phase (900), the mobility management context is transferred to a mobility management entity (MME) (240) and radio and transport resources are reserved for the UE (210) at the target E-UTRAN cell (230). When a handover is initiated (910) by either the UE or the non-3GPP network, the time-consuming authentication and authorization procedures that are performed during the process of pre-registration can be skipped. Additionally, radio and transport resources have already been assigned to the UE and thus do not have to be set-up when the handover executes.
Inventors
- 👤 K. Apostolis Saltkintzis
- 👤 C.Richard Burbidge
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 13:02
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/0005; H04W36/0011; H04W36/0016; H04W12/00; H04W12/06; H04W36/0033; H04W36/0038; H04W36/14; H04W36/144; H04W8/00; H04W8/02; H04W8/08; H04W8/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
110 words
A method for handing over a user equipment (UE) from a non-3GPP radio access to a 3GPP radio access network comprising: receiving a pre-attach request message from the UE including a unique identifier for the UE through the non-3GPP radio access; receiving security information for the UE from a home subscriber server (HSS) and authenticating the UE; creating a mobility management context for the UE including the unique identifier for the UE, a tracking area identifier, a temporary identifier for the UE, and a security context for the UE; transferring the mobility management context to a mobility management entity (MME); and initiating resource preparation at a target 3GPP access cell.
Claim 2
Dependent Claim
20 words
A method according to claim 1 wherein the pre-attach request message includes: a Target E-UTRAN Cell ID for the UE.
Claim 3
Dependent Claim
31 words
A method according to claim 2 wherein the transferring and the initiating comprises: sending a forward relocation request to the MME and receiving a forward relocation request acknowledgement from the MME.
Claim 4
Dependent Claim
20 words
A method according to claim 3 further comprising: sending a pre-attach accept message with a handover command to the UE.
Claim 5
Dependent Claim
26 words
A method according to claim 3 further comprising: receiving a forward relocation complete message; and directing the non-3GPP radio access to release resources supporting the UE.
Claim 6
Dependent Claim
22 words
A method according to claim 1 wherein the pre-attach request message does not include a Target 3GPP Cell ID for the UE.
Claim 7
Dependent Claim
19 words
A method according to claim 6 further comprising: after the creating, transmitting a pre-attach accept message to the UE.
Claim 8
Dependent Claim
20 words
A method according to claim 7 wherein the pre-attach accept message does not include a handover command to the UE.
Claim 9
Dependent Claim
20 words
A method according to claim 7 further comprising: receiving a next pre-attach request message including a Target 3GPP Cell ID.
Claim 10
Dependent Claim
38 words
A method according to claim 9 wherein the transferring and the initiating comprises: after receiving the next pre-attach request message, sending a forward relocation request to the MME and receiving a forward relocation request acknowledgement from the MME.
Claim 11
Dependent Claim
26 words
A method according to claim 10 further comprising: receiving a forward relocation complete message; and directing the non-3GPP radio access to release resources supporting the UE.
Claim 12
Dependent Claim
17 words
A method according to claim 6 further comprising: receiving a relocation required message from the non-3GPP access.
Claim 13
Dependent Claim
37 words
A method according to claim 12 further comprising: sending a forward relocation request to the MME and receiving a forward relocation request acknowledgement from the MME; and transmitting a relocation required acknowledgement to the non-3GPP radio access.
Claim 14
Dependent Claim
26 words
A method according to claim 13 further comprising: receiving a forward relocation complete message; and directing the non-3GPP radio access to release resources supporting the UE.
Claim 15
Dependent Claim
28 words
A method according to claim 1 further comprising: setting up a data session from the UE to a target serving gateway; and performing a tracking area update procedure.
Claim 16
Independent Claim
62 words
A method for a user equipment (UE) to hand over from a non-3GPP radio access to a 3GPP radio access network comprising: transmitting a pre-attach request message including a unique identifier for the UE through the non-3GPP radio access to a Forward Attach Function (FAF); participating in authentication of the UE by the FAF; and receiving a handover command from the FAF.
Claim 17
Dependent Claim
17 words
A method according to claim 16 wherein the pre-attach request message includes: a Target E-UTRAN Cell ID.
Claim 18
Dependent Claim
27 words
A method according to claim 17 further comprising: transmitting a Handover to E-UTRAN Complete message after camping on a E-UTRAN access with the Target E-UTRAN Cell ID.
Claim 19
Dependent Claim
19 words
A method according to claim 16 wherein the pre-attach request message does not include a Target 3GPP Cell ID.
Claim 20
Dependent Claim
23 words
A method according to claim 19 further comprising: before the receiving, transmitting a next pre-attach request message including a Target E-UTRAN Cell ID.
Claim 21
Dependent Claim
27 words
A method according to claim 20 further comprising: transmitting a Handover to E-UTRAN Complete message after camping on a E-UTRAN access with the Target E-UTRAN Cell ID.
References Cited (Backward Citations)
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