# US 10,321,491 B2 · Method and apparatus for supporting local gateway service for dual connectivity in wireless communication system

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- Number: US 10,321,491 B2
- Document ID: US10321491B2
- Status: Granted
- Kind: B2
- Application number: 15/515,560
- Filed: 2015-11-02
- Published: 2017-08-10
- Granted: 2019-06-11
- Earliest claimed: 2014-11-12
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Jian Xu; Daewook Byun
- Web page: https://patentgrep.com/patent/US10321491B2

## CPC

- H04W 76/10: Connection setup
- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04B 7/26: at least one of which is mobile
- H04J 11/00: Orthogonal multiplex systems, {e.g. using WALSH codes}(H04J13/00 takes precedence)
- H04L 1/0026: {Transmission of channel quality indication}
- H04W 28/02: Traffic management, e.g. flow control or congestion control
- H04W 76/15: Setup of multiple wireless link connections
- H04W 88/08: Access point devices
- H04W 92/20: between access points
- H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)}
- H04W 76/11: Allocation or use of connection identifiers
- H04W 88/16: Gateway arrangements
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A method and apparatus for supporting a local gateway (L-GW) service in a wireless communication system is provided. When an L-GW is co-located with a master evolved NodeB (MeNB) in dual connectivity, a secondary evolved NodeB (SeNB) in dual connectivity receives a request message including information on a specific E-UTRAN radio access bearer (E-RAB), which is served by a L-GW, from a master evolved NodeB (MeNB) in dual connectivity which has the L-GW, decides to transmit data via a X2 interface instead of a S1-U interface for the specific E-RAB, and transmits a response message to the MeNB.

## Claims

### Claim 1

A method for a secondary evolved NodeB (SeNB) in dual connectivity in a wireless communication system, the method comprising:
receiving a request message including information on a specific evolved universal mobile telecommunication system (UMTS) terrestrial radio access network (E-UTRAN) radio access bearer (E-RAB), which is served by a local gateway (L-GW), from a master evolved NodeB (MeNB) in dual connectivity which is collocated with the L-GW;
deciding to transmit data via a X2 interface instead of a S1-U interface for the specific E-RAB; and
transmitting a response message to the MeNB.

### Claim 2 (depends on 1)

The method of claim 1, wherein the request message requests the SeNB to allocate radio resource for the specific E-RAB.

### Claim 3 (depends on 1)

The method of claim 1, wherein the request message further includes at least one of an indication that the L-GW is to be used for the specific E-RAB, a correlation identifier (ID), or a MeNB general packet radio service (GPRS) tunneling protocol (GTP) tunnel endpoint ID (TEID).

### Claim 4 (depends on 3)

The method of claim 3, wherein the correlation ID includes a selected Internet protocol (IP) traffic offload (SIPTO) correlation ID or a local IP (LIPA) correlation ID.

### Claim 5 (depends on 1)

The method of claim 1, wherein the request message is a SeNB Addition Request message or a SeNB Modification Request message.

### Claim 6 (depends on 1)

The method of claim 1, wherein the information on the specific E-RAB includes at least one of E-RAB parameters for the specific E-RAB, or transport network layer (TNL) address information for the specific E-RAB.

### Claim 7 (depends on 1)

The method of claim 1, wherein the response message includes at least one of a X2 downlink (DL) general packet radio service (GPRS) tunneling protocol (GTP) tunnel endpoint, a SeNB GTP tunnel endpoint, or an indication for the specific E-RAB to be served by the L-GW.

### Claim 8 (depends on 1)

The method of claim 1, wherein the response message is a SeNB Addition Request Acknowledge message or a SeNB Modification Request Acknowledge message.

### Claim 9

A secondary evolved NodeB (SeNB) in dual connectivity comprising:
a memory;
a transceiver; and
a processor coupled to the memory and the transceiver, and configured to:
control the transceiver to receive a request message including information on a specific evolved universal mobile telecommunication system (UMTS) terrestrial radio access network (E-UTRAN) radio access bearer (E-RAB), which is served by a local gateway (L-GW), from a master evolved NodeB (MeNB) in dual connectivity which is collocated with the L-GW;
decide to transmit data via a X2 interface instead of a S1-U interface for the specific E-RAB; and
control the transceiver to transmit a response message to the MeNB.

### Claim 10 (depends on 9)

The SeNB of claim 9, wherein the request message requests the SeNB to allocate radio resource for the specific E-RAB.

### Claim 11 (depends on 9)

The SeNB of claim 9, wherein the request message further includes at least one of an indication that the L-GW is to be used for the specific E-RAB, a correlation identifier (ID), or a MeNB general packet radio service (GPRS) tunneling protocol (GTP) tunnel endpoint ID (TEID).

### Claim 12 (depends on 9)

The SeNB of claim 9, wherein the request message is a SeNB Addition Request message or a SeNB Modification Request message.

### Claim 13 (depends on 9)

The SeNB of claim 9, wherein the information on the specific E-RAB includes at least one of E-RAB parameters for the specific E-RAB, or transport network layer (TNL) address information for the specific E-RAB.

### Claim 14 (depends on 9)

The SeNB of claim 9, wherein the response message includes at least one of a X2 downlink (DL) general packet radio service (GPRS) tunneling protocol (GTP) tunnel endpoint, a SeNB GTP tunnel endpoint, or an indication for the specific E-RAB to be served by the L-GW.

### Claim 15 (depends on 9)

The SeNB of claim 9, wherein the response message is a SeNB Addition Request Acknowledge message or a SeNB Modification Request Acknowledge message.