Il-Soon Jang

Entertainment lighting control network standardization to support VLC services

VLC technology is receiving increasing attention in research and product development these days because high lumen/watt LEDs are becoming the dominant sources for artificial lighting. Successful VLC data transmission from luminaires requires that the data first be moved to the luminaires over a backbone network. This article addresses the lighting control network as a backbone for VLC services and describes a standards-drafting project, designated BSR E1.45, for entertainment lighting control to support the transmission of data for VLC from luminaires. E1.45 specifies a data frame format that can coexist with ANSI E1.11 messages on lighting control network, and thus deliver VLC data to luminaires for transmission from those luminaires.

Improved cycle time synchronization method for isochronous data transfer on Wireless 1394 network

This paper presents the cycle time synchronization to transmit isochronous multimedia data by real time in wireless 1394 network. Wireless 1394 should synchronize the cycle time of a coordinator and those of slaves. In wireless 1394 system, the cycle time of a coordinator is transferred via beacons to slaves periodically. Beacons include cycle time information of a coordinator. This paper proposes a new cycle time synchronization method requiring only one beacon, not consecutive beacons in wireless 1394 network. In a conventional system, all slaves need to receive at least two consecutive beacons from the coordinator. However, it was hard to receive two consecutive beacons every time due to the noise in a wireless channel. Whenever all slaves receive a beacon, they save their beacon number and cycle time in the registers. They can get the time drift from the saved cycle time information of a previous beacon and the cycle time information of a current beacon. As experimental results, the proposed cycle time synchronization scheme achieves 82% performance improvement over the conventional cycle time synchronization method. This will contribute to transfer isochronous multimedia data using a UWB wireless channel. It successfully transfers this stream to the HDTV using two different wireless 1394 systems.

Implementation of ZigBee-VLC system to support light control network configuration

In this paper, ZigBee-VLC Transmitter and Receiver are designed, implemented and tested. By utilizing the ZigBee-VLC Transmitter and Receiver, commissioning procedures for light control network configuration are simplified and commissioning time is drastically reduced. With this configuration, lighting control network configured to use a maximum of 216 lighting is possible. As a result of this research, the transmitter is complete with ZigBee-VLC features implemented in the Single MCU without rising production costs and the 1-board solution receiver including a ZigBee and VLC functions are implemented. In addition, as a result of the test work using the light control app, dramatically shortening commissioning time, easy lighting control is possible was confirmed.

Isochronous Data Transfer between AV Devices Using Pseudo CMP Protocol in IEEE 1394 over UWB Network

This paper presented a new method to transfer isochronous data through an IEEE 1394 over UWB (ultra wideband) network. The goal of this research is to implement a complete heterogeneous system without commercial IEEE 1394 link chips supporting the bridge-aware function. The method resolving this dedicated chip-less situation, was employed a new bridge adapting a pseudo connection management protocol (CMP). This approach made a wired 1394 devices as an IEEE 1394 over UWB device. This method allowed an IEEE 1394 equipment to transfer an isochronous data using a UWB wireless communication network. The result of this approach was demonstrated successfully via an IEEE 1394 over UWB bridge module. The proposed CMP and IEEE 1394 over UWB bridge module can exchange isochronous data through an IEEE 1394 over UWB network. This method makes an IEEE 1394 equipment transfer an isochronous data using a UWB wireless channel.

Implementation of VLC transmitter using MCU for promotion lighting ID services

In this paper, we propose a MCU-based signal generating method and a physical layer frame format for promotion lighting ID services using visible light communication (VLC) technology. The proposed method and format for VLC services are possible to be simply implemented by updating the firmware of existing MCU which is in the LED lighting for dimming function. We get the potential of performing visible light communication using MCU through the experiments.

New Medium Idle Time Via Industry Protocol Type

WiMedia UWB platform consists of two specifications; WiMedia MAC and PHY. WiMedia MAC may give support to allow industry protocol applications to share UWB resource. Actually, in addition to certified wireless USB, wireless 1394 and TCP/IP, many other industry protocols can reside on top of the WiMedia UWB platform. Thus the mechanism to decide medium access time between them is very important to support QoS. However current WiMedia MAC only defines differentiated medium access idle time via Access Categories(ACs) for traffic data type. The medium access idle time by the ACs may not guarantee QoS for multiple industry protocol applications. For example, if two industry protocols, wireless USB and wireless 1394, use the same AC by same traffic data type, the protocols may easily have contention collision due to same idle time through same AC, because ACs decide medium idle time. Within WiMedia MAC specification, all application devices shall wait for specific idle time called Arbitration Interframe Space(AIFS), which is defined by ACs and PCA parameters, before accessing the shared medium. After AIFS duration, devices can transmit data on the shared medium. Since same AC has the same AIFS Duration, in the multiple industry protocol environments, an idle time via the ACs may be very inadequate for a medium access QoS. In this paper, we concentrate on defining an industry protocol-based AIFS parameter for a new medium access method. The values of industry protocol-based AIFS parameters are determined by priority of industry protocol applications. End user can set the priority of an industry protocol for its own use case.

Isochronous data transfer by enhanced CTS on Wireless 1394 Network

This paper presents a new synchronization method requiring only one beacon, not consecutive beacons. All slaves in a conventional system need to receive two consecutive beacons from the network master for synchronization although an isochronous transfer mode in wireless 1394 network guarantees a fixed data rate for real-time data transfer. It is very hard to receive two consecutive beacons every time due to the noise in a wireless channel. Whenever all slaves receive a beacon, they save its number and cycle time in the registers. They can get the drift time from the saved information comparing with the received one. The proposed scheme achieves 82% performance improvement over the previously used method of the wireless 1394 TA.

Design of Protocol Adaptation Layer for IEEE 1394 over IEEE 802.15.3

In this paper, protocol adaptation layer for IEEE 1394 over IEEE 802.15.3 was designed. Connection procedure method between coordinator and slave device and cycle time synchronization method between wired IEEE 1394 device and wireless device were presented. If new method is adopted for various wireless 1394 products, consumer electronics devices such as DTV and Set-top Box or PC devices on a 1394 bus network can transmit real time data to the AV devices on the other 1394 bus in a different place via IEEE 802.15.3.

Isochronous Data Transfer between AV Devices using Pseudo CMP Protocol in Wireless 1394 System

This paper presented a new method to transfer isochronous data through a wireless 1394 network. It is difficult to implement a complete heterogeneous system because there are no commercial 1394 link chips supporting the bridge-aware function. The proposed bridge adapting the pseudo CMP protocol made a wired 1394 device as a wireless 1394 device. This method made an IEEE 1394 equipment transfer an isochronous data using a UWB communication method. The demonstration showed successful data transfers between the network with the proposed CMP and the wireless 1394.

A Protocol-Based Contention Window for MBOA MAC

In the early days of UWB development, IEEE802.15.3 MAC was a leading standard for UWB PHY, but now MBOA MAC has been considered as one of the most potential solutions for the medium access control (MAC) of the next generation of UWB PHY. Future home network may require that the MBOA MAC support a multi-protocol solution that will provide a mixed operation among PC, CE and mobile devices at the same time. Each device employs its own proper protocol. For example, AV devices for CE may use IEEE1394 protocol and mobile devices may use Bluetooth (BT) protocol. In order to support such multi-protocol environment effectively, the MBOA MAC needs to use a medium access method through a contention based on application protocol types. In this paper, we concentrate on defining a protocol-based contention window for a new medium access method. The values of protocol-based contention windows are determined by priority of application protocols.