# US 8,543,114 B2 · Voice over LTE via generic access handover (HO) apparatus and method

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- Number: US 8,543,114 B2
- Document ID: US8543114B2
- Status: Granted
- Kind: B2
- Application number: 13/124,282
- Filed: 2009-09-13
- Published: 2011-08-25
- Granted: 2013-09-24
- Earliest claimed: 2008-10-15
- Assignees: Telefonaktiebolaget LM Ericsson (publ)
- Applicants: Magnus Hallenstål; Göran Rune; Jari Vikberg; Häkan Axelsson; Thomas Johansson; Tomas Nylander
- Inventors: Magnus Hallenstål; Göran Rune; Jari Vikberg; Häkan Axelsson; Thomas Johansson; Tomas Nylander
- Web page: https://patentgrep.com/patent/US8543114B2

## CPC

- H04W 60/04: using triggered events
- H04W 36/24: Reselection being triggered by specific parameters
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method and system wherein a Voice over LTE via Generic Access (VoLGA) Access Network Controller (VANC)1 upon receiving a REGISTER and REGISTER UPDATE message from the UE1 notifies a Hand Over Selection Function node (HOSF) that a user equipment (UE) is registered in the VANC. This will only be done if the HOSF has not theretofore been notified.

## Claims

### Claim 1

A method of facilitating a handover (HO) of a user equipment (UE) in a wireless system, comprising the steps of:
triggering, by a Long Term Evolution (LTE) Attachment or Tracking Area Update (TAU), a UE to start a REGISTER or REGISTER UPDATE procedure;
sending the REGISTER or REGISTER UPDATE to a Voice over LTE Generic Access (VoLGA) Access Network Controller (VANC);
checking, by the VANC, upon receiving the REGISTER or REGISTER UPDATE, if a plurality of LTE HO selection functions (HOSFs) have theretofore been notified that the UE is registered to the VANC, and if not, then sending, by the VANC, data with a VANC name/address and an International Mobile Subscriber Identity (IMSI) of the UE, all in parallel, to the plurality of LTE HOSFs; and
acknowledging, by each of the plurality of LTE HOSFs, receipt of the data with a response.

### Claim 2 (depends on 1)

The method of claim 1, wherein the UE cannot start the REGISTER or REGISTER UPDATE procedure during an active call.

### Claim 3 (depends on 1)

The method of claim 1, wherein the step of sending, by the VANC, data with the VANC name/address and IMSI of the UE, all in parallel, to the plurality of LTE HOSFs further includes the step of provisioning addresses of each of the plurality of LTE HOSFs from an Operations and Maintenance (O&M) node.

### Claim 4 (depends on 3)

The method of claim 3, wherein the addresses could either be Internet Protocol (IP) addresses or Fully Qualified Domain Names (FQDNs).

### Claim 5 (depends on 1)

The method of claim 1, wherein the UE is triggered to commence the REGISTER or REGISTER UPDATE procedure during an active call.

### Claim 6 (depends on 5)

The method of claim 5, wherein at every HO, if there is a TAU, the REGISTER or REGISTER UPDATE procedure will commence.

### Claim 7 (depends on 6)

The method of claim 6, wherein the VANC will, upon receiving a REGISTER or REGISTER UPDATE, select a LTE HOSF from the plurality of LTE HOSFs based on a Tracking Update (TA) Identity (ID) received.

### Claim 8

A system for facilitating the handover (HO) of a user equipment (UE), comprising:
a node operable to trigger, by a Long Term Evolution (LTE) Attachment or Tracking Area Update (TAU), a UE to start a REGISTER or REGISTER UPDATE procedure;
a UE operable to send the REGISTER or REGISTER UPDATE to a Voice over LTE Generic Access (VoLGA) Access Network Controller (VANC);
the VANC operable to check upon receiving the REGISTER or REGISTER. UPDATE, if a plurality of LTE HO selection functions (HOSFs) have theretofore been notified that the UE is registered to the VANC, and if not, then sending, by the VANC, data with a VANC name/address and an International Mobile Subscriber Identity (IMSI) of the UE, all in parallel, to the plurality of LTE HOSFs; and
the plurality of LTE HOSFs operable to acknowledge receipt of the data with a response.

### Claim 9 (depends on 8)

The system of claim 8, wherein the UE cannot start the REGISTER or REGISTER UPDATE procedure during an active call.

### Claim 10 (depends on 8)

The system of claim 8, wherein the VANC is operable to send data with the VANC name/address and IMSI of the UE, all in parallel, to the plurality of LTE HOSFs and is further operable to provision addresses of each of the plurality of LTE HOSFs from an Operations and Maintenance (O&M) node.

### Claim 11 (depends on 10)

The system of claim 10, wherein the addresses could either be Internet Protocol (IP) addresses or Fully Qualified Domain Names (FQDNs).

### Claim 12 (depends on 8)

The system of claim 8, wherein the UE is triggered to commence the REGISTER or REGISTER UPDATE procedure during an active call.

### Claim 13 (depends on 12)

The system of claim 12, wherein at every HO, if there is a TAU, the REGISTER or REGISTER UPDATE procedure will commence.

### Claim 14 (depends on 13)

The system of claim 13, wherein the VANC will, upon receiving a REGISTER and REGISTER UPDATE, select a LTE HOSE from the plurality of LTE HOSFs based on a Tracking Update (TA) Identity (ID) received.