Youngae Jeon

Meshing wireless personal area networks: Introducing IEEE 802.15.5

This article presents an overview of the IEEE project 802.15.5 that targets providing mesh capabilities to both high-rate and low-rate wireless personal area networks. Low-rate mesh is built on IEEE 802.15.4 MAC, while high-rate mesh utilizes IEEE 802.15.3 MAC. We seek to share our insights and motivations of the approach adopted in the major components of the standard instead of presenting a la carte items drawn in the specification. We hope this article helps readers of the 802.15.5 standard to better understand the rationale and intent of the protocol design.

Distributed Fast Beacon Scheduling for Mesh Networks

Despite its many benefits, the use of the beacon-enabled mode in multi-hop communications has been limited due to beacon collision problems. In addition, although there has been a lot of research on the beacon scheduling for a tree topology, only a few studies have dealt with the beacon scheduling for a mesh network, which enables more reliable communication by maintaining multiple paths. For a beacon enabled mesh network, the IEEE802.15.4e standard, an emerging new standard for enhanced 802.15.4 MAC, more specifically DSME capability provides a concrete specification about a bitmap-based distributed beacon scheduling. However, it still has some limitations and additional problems which can happen during operation. Therefore, in this paper, we introduce a novel beacon scheduling algorithm to construct a scalable, reliable mesh network. The proposed approach manages efficiently beacon slots of neighboring nodes by means of a fixed length of single variable, RINSD, rather than a bitmap, achieves fast network construction via active allocation of devices, and resolves the potential beacon collision. The experimental results demonstrate that the DFBS achieves faster beacon scheduling and is more efficient in memory usage and beacon frame size than 15.4e DSME standard.

Residential HDTV distribution system using UWB and IEEE 1394

We propose a residential HDTV distribution system that is composed of UWB and IEEE 1394. This system converts multi-channel MPEG TS broadcasting data into IEEE 1394 packets or UWB packets based on IEEE802.15.3 WPAN. Any distributed UWB packets are again converted into MPEG TS data through a UWB-to-IEEE1394 bridge. Moreover, this system can also transmit IPTV packets encapsulated with IEEE 1394 packets from a home gateway or home server to a home UWB network. We implement UWB MAC and physical layer chips using CMOSASICs.

High definition video transmisision using Bluetooth over UWB

Bluetooth technology has been widely adopted in consumer or mobile devices due to its small form factor and low product cost. However increasing demand for high-speed multimedia applications continuously stimulates Bluetooth to adopt an alternative MAC and PHY technology. In this paper, we propose a dual-mode Bluetooth application which uses both a legacy Bluetooth module for low-speed communication and an alternative UWB module for high-speed Bluetooth communication. We modified legacy Bluetooth profiles for high definition video transmission and developed UWB SoC that can be used for high speed Bluetooth communication.

Gigabit UWB video transmission system for wireless video area network

Ultra-wideband (UWB) technology has offered a large application bandwidth which has been reached up to 1 Gb/s recently. One of various UWB specifications, medium access control (MAC) and physical layer (PHY) technologies of WiMedia Alliance can also be used for high speed multimedia applications to establish a wireless video area network (WVAN). In this paper, we propose a Gb/s UWB video transmission system for WVANs. In order to verify the possibilities of Gb/s wireless transmission of multiple video streams, we first built an analysis model and a simulation model. Then we implemented a hardware-based traffic processing block and a Gb/s wireless MAC accelerator. Using the proposed Gb/s video transmission system, we can transmit high definition video streams to several tens of users while guaranteeing quality of service.

A fully integrated ieee IEEE 802.15.4g MR-FSK SoC soc for smart utility network applications

This paper presents a fully integrated multi-rate and multi-regional frequency shift keying (MR-FSK) system-on-chip (SoC) in 180-nm CMOS technology compliant with IEEE 802.15.4g standard for smart utility network (SUN). This SoC integrates all blocks including 800/900 MHz RF/Analog transceiver, digital modem, medium access controller (MAC) and security functions. The total SoC die area is 4.8 mm x 3.5 mm. The transceiver power consumption is 57 mW in receiving mode and 41 mW - 79 mW in transmitting mode, while the digital part consumes 19.5 mW. The implemented SoC exceeds the sensitivity requirements of IEEE 802.15.4g standard and is suitable for long-range and low-duty cycled SUN applications, such as advanced metering infrastructure (AMI).

Standardization activities and technology competitors for the in-home networking

The in-home networking is critical for distribution of data to the various customer devices that will be attached-TVs, PCs, stereos, alarms, and so on. It must support multiple data types with high security, easy configuration, low cost, and negligible maintenance. This paper overviews the in-home networking with emphasis on its standardization activities of ATM Forums RBB working group and DAVIC, and its implementation technology competitors such as the IEEE 1394 Firewire and the ATM Warren. Then we suggest the further important considerations of these technologies.

Uncompressed video transmission in portable devices for wireless video mirroring service

Wireless transmission of uncompressed video guarantees higher quality with lower latency than compressed video transmission. Although current wireless technologies cannot fully cover required data rates of about a few Gb/s for full high definition resolution, some wireless technologies such as ultra-wideband (UWB) provide 1 Gb/s data rate which is adequate for uncompressed video transmission in portable devices. In this paper, we propose an uncompressed video transmission system for wireless mirroring services in potable devices. We firstly simulated the performance of uncompressed video transmission using 1 Gb/s UWB technology. Then we implemented hardware-based uncompressed video processing block and Gb/s wireless MAC accelerator. Finally, we show the possibilities of uncompressed video transmission using single 1 Gb/s UWB physical layer (PHY) and extended transmission for more higher resolution using multiple UWB PHYs.

QoS routing for distributed MAC-based high rate wireless personal area networks

QoS routing for a TDMA-based HR-WPAN requires bandwidth (time slots) to be reserved on the entire path. Depending on the way of route discovery and bandwidth reservation, QoS routing can be classified into two types: on-demand (reactive) and table-driven (proactive). Simulation results indicate that table-driven QoS routing outperforms on-demand QoS routing when average hop count is large. When average hop count is small, vice versa. Two QoS routing protocols can also be integrated to enhance overall performance. Hybrid QoS routing begins with table-driven QoS routing and, if necessary, switches later on to on-demand QoS routing. By combining proactive and reactive features, hybrid QoS routing maintains network performance satisfactorily regardless of average hop count.

An Adaptive Superframe Duration Allocation Algorithm for Resource-Efficient Beacon Scheduling.

Beacon scheduling is considered to be one of the most significant challenges for energy-efficient Low-Rate Wireless Personal Area Network (LR-WPAN) multi-hop networks. The emerging new standard, IEEE802.15.4e, contains a distributed beacon scheduling functionality that utilizes a specific bitmap and multi-superframe structure. However, this new standard does not provide a critical recipe for superframe duration (SD) allocation in beacon scheduling. Therefore, in this paper, we first introduce three different SD allocation approaches, LSB first, MSB first, and random. Via experiments we show that IEEE802.15.4e DSME beacon scheduling performs differently for different SD allocation schemes. Based on our experimental results we propose an adaptive SD allocation (ASDA) algorithm. It utilizes a single indicator, a distributed neighboring slot incrementer (DNSI). The experimental results demonstrate that the ASDA has a superior performance over other methods from the viewpoint of resource efficiency.