# US 2019/0174375 A1 · Core network and base station

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- Number: US 2019/0174375 A1
- Document ID: US20190174375A1
- Status: Published application
- Kind: A1
- Application number: 16/324,200
- Filed: 2017-08-14
- Published: 2019-06-06
- Earliest claimed: 2016-08-12
- Assignees: Ntt Docomo, Inc.
- Applicants: Ntt Docomo, Inc.
- Inventors: Wuri Andarmawanti Hapsari; Tooru Uchino; Hideaki Takahashi; Ryusuke Matsukawa
- Web page: https://patentgrep.com/patent/US20190174375A1

## CPC

- H04W 36/02: Buffering or recovering information during reselection {; Modification of the traffic flow during hand-off}
- H04W 28/10: Flow control {between communication endpoints}
- H04W 36/023: {Buffering or recovering information during reselection}
- H04W 88/14: Backbone network devices
- H04W 88/08: Access point devices
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Provided is a scheme of generating an end marker for a data flow in flow-based handover transfer control. An aspect of the present invention relates to a core network which includes a flow control unit that switches a path of a data flow having a flow identifier and a flow priority from a first base station to a second base station and an end marker generating unit that generates an end marker of a data flow transferred from the first base station to the second base station via a tunnel in accordance with a generation rule based on one or more of the flow identifier, the flow priority, and the tunnel.

## Claims

### Claim 1

A core network, comprising:
a flow control unit that switches a path of a data flow having a flow identifier and a flow priority from a first base station to a second base station; and
an end marker generating unit that generates an end marker of a data flow transferred from the first base station to the second base station via a tunnel in accordance with a generation rule based on one or more of the flow identifier, the flow priority, and the tunnel.

### Claim 2 (depends on 1)

The core network according to claim 1,
wherein the end marker generating unit generates the end marker of the data flow for each flow identifier.

### Claim 3 (depends on 1)

The core network according to claim 1,
wherein the end marker generating unit generates the end marker of the data flow for each combination of the flow identifier and the flow priority.

### Claim 4 (depends on 1)

The core network according to claim 1,
wherein the end marker generating unit generates the end marker of the data flow for each flow priority.

### Claim 5 (depends on 1)

The core network according to claim 1,
wherein the end marker generating unit generates the end marker of the data flow for each tunnel.

### Claim 6

A base station, comprising:
a transmission and reception unit that receives a data flow from a base station of a handover source and a core network and starts to transmit the data flow transmitted from the core network to a user equipment when an end marker of the data flow transmitted from the base station of the handover source is received; and
an end marker detecting unit that detects the end marker of the data flow transferred from the base station of the handover source,
wherein the transmission and reception unit receives the data flow having a flow identifier and a flow priority from the base station of the handover source via a tunnel, and
when the end marker detecting unit detects the end marker generated in accordance with a generation rule based on one or more of the flow identifier, the flow priority, and the tunnel, the transmission and reception unit starts to transmit the data flow corresponding to the detected end marker which is received from the core network.