# US 8,543,155 B2 · Channel access method for vehicle communication handover

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- Number: US 8,543,155 B2
- Document ID: US8543155B2
- Status: Granted
- Kind: B2
- Application number: 13/195,365
- Filed: 2011-08-01
- Published: 2012-02-02
- Granted: 2013-09-24
- Earliest claimed: 2010-08-02
- Assignees: Electronics and Telecommunications Research Institute
- Applicants: Sangwoo Lee; Hyun Kyun Choi; Hyun Seo Oh
- Inventors: Sangwoo Lee; Hyun Kyun Choi; Hyun Seo Oh
- Web page: https://patentgrep.com/patent/US8543155B2

## CPC

- H04W 36/18: for allowing seamless reselection, e.g. soft reselection
- H04W 74/00: Wireless channel access
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A first roadside equipment operates as a transmitting/receiving mode in a control channel interval of an Nth synchronization interval so as to support a handover. In this instance, a second roadside equipment neighboring to the first roadside equipment operates as a receiving mode in the control channel interval of the Nth synchronization interval. The first roadside equipment operates as the receiving mode in a control channel interval of an (N+1)th synchronization interval. In this instance, the second roadside equipment operates as the transmitting/receiving mode in the control channel interval of the (N+1)th synchronization interval.

## Claims

### Claim 1

A method for a plurality of roadside equipments to access a channel to support a vehicle communication handover, the method comprising:
a first roadside equipment among the plurality of roadside equipments operating a transmitting/receiving mode in a control channel interval of an Nth synchronization interval;
a second roadside equipment neighboring to the first roadside equipment among the plurality of roadside equipments operating as a receiving mode in the control channel interval of the Nth synchronization interval;
the first roadside equipment operating as the receiving mode in a control channel interval of an (N+1)th synchronization interval; and
the second roadside equipment operating as the transmitting/receiving mode in the control channel interval of the (N+1)th synchronization interval.

### Claim 2 (depends on 1)

The method of claim 1, wherein the Nth synchronization interval and the (N+1)th synchronization interval respectively further include a service channel interval.

### Claim 3 (depends on 2)

The method of claim 2, wherein the plurality of roadside equipments operating as the transmitting/receiving mode in the service channel interval of the Nth synchronization interval and the (N+1)th synchronization interval.

### Claim 4 (depends on 1)

The method of claim 1, wherein the first roadside equipment or the second roadside equipment transmits/receives a frame to/from a vehicle in the transmitting/receiving mode.

### Claim 5 (depends on 1)

The method of claim 1, wherein the first roadside equipment or the second roadside equipment receives a frame from a vehicle in the receiving mode.

### Claim 6 (depends on 1)

The method of claim 1, wherein the first roadside equipment and the second roadside equipment are disposed to form an interval in which a propagation range is overlapped.

### Claim 7 (depends on 1)

The method of claim 1, wherein the control channel interval and the service channel interval are alternately set in the Nth synchronization interval and the (N+1)th synchronization interval.

### Claim 8

A method for a plurality of roadside equipments to access a channel to support a vehicle communication handover, the method comprising:
a first roadside equipment among the plurality of roadside equipments operating as a transmitting/receiving mode in a control channel interval of an Nth synchronization interval;
a second roadside equipment neighboring to the first roadside equipment among the plurality of roadside equipments operating as a receiving mode in the control channel interval of the Nth synchronization interval;
the first roadside equipment and the second roadside equipment operating as the transmitting/receiving mode in a service channel interval of the N-th synchronization interval;
the first roadside equipment operating as the receiving mode in a control channel interval of an (N+1)th synchronization interval;
the second roadside equipment operating as the transmitting/receiving mode in the control channel interval of the (N+1)th synchronization interval; and
the first roadside equipment and the second roadside equipment operating as the transmitting/receiving mode in a service channel interval of the (N+1)th synchronization interval.

### Claim 9 (depends on 8)

The method of claim 8, wherein the first roadside equipment or the second roadside equipment transmits/receives a frame to/from a vehicle in the transmitting/receiving mode.

### Claim 10 (depends on 8)

The method of claim 8, wherein the first roadside equipment or the second roadside equipment receives a frame from a vehicle in the receiving mode.

### Claim 11 (depends on 8)

The method of claim 8, wherein the first roadside equipment and the second roadside equipment are disposed to form an interval in which a propagation range is overlapped.

### Claim 12 (depends on 8)

The method of claim 8, wherein the control channel interval and the service channel interval are alternately set in the Nth synchronization interval and the (N+1)th synchronization interval.