IEEE802.15.4a(ieee802.15.4a标准的作用)

频道：电子元器件日期：2023-05-31 15:46:19 浏览：341

IEEE802.15.4a

本文内容来自于互联网，分享IEEE802.15.4a(ieee802.15.4a标准的作用)

无线个人区域网络（PAN）标准

IEEE802.15.4a

Institute of Electrical and Electronics Engineers 802.15.4a

IEEE 802.15.4a任务小组致力于为低等级工业市场开发一种无线个人区域网络（PAN）标准，目前还小组已经选定Nanotron Technologies GmbH公司设计的宽带线性调频扩频(Chirp Spread Spectrum)物理层技术作为基准物理层标准。随着05年802.3超宽带（ultrawideband，UWB）PAN标准被宣判死刑，802.15.4a被视为PAN内的潜在核心UWB应用之一。在第一轮投票之后，该标准以94%的通过率通过了首轮倡议者投票。这种网络技术被设计用于实时精准位置和感应网络。802.15.4a前任副主席，Staccato Communications公司的Jason Ellis将这种网络描述为ZigBe……

+ 查看全文

IEEE 802.15.4a任务小组致力于为低等级工业市场开发一种无线个人区域网络（PAN）标准，目前还小组已经选定Nanotron Technologies GmbH公司设计的宽带线性调频扩频(Chirp Spread Spectrum)物理层技术作为基准物理层标准。

随着05年802.3超宽带（ultrawideband，UWB）PAN标准被宣判死刑，802.15.4a被视为PAN内的潜在核心UWB应用之一。在第一轮投票之后，该标准以94%的通过率通过了首轮倡议者投票。

这种网络技术被设计用于实时精准位置和感应网络。802.15.4a前任副主席，Staccato Communications公司的Jason Ellis将这种网络描述为ZigBee和RFID的混合体，不过其2-Mbit/s的数据传输率和低功率消耗是为工厂和医疗应用而优化，并不适合家用和商用。

Nanotron公司计划提供基于宽带线性调频扩频的芯片，它们将可用于最大范围60米的室内环境或最大范围900米的户外环境。

WikiPedia关于IEEE802.15的定义：

IEEE 802.15 is the 15th working group of the IEEE 802 which specializes in Wireless PAN (Personal Area Network) standards. It includes four task groups (numbered from 1 to 4):

Task group 1 (WPAN/Bluetooth)

IEEE 802.15.1-2002 has derived a Wireless Personal Area Network standard based on the Bluetooth v1.1 specifications. It includes a medium access control and physical layer specification. An updated version, IEEE 802.15.1-2005, has been published.

Task group 2 (Coexistence)

IEEE 802.15.2-2003 addresses the issue of coexistence of wireless personal area networks (WPAN) with other Wireless Devices operating in Unlicensed Frequency Bands such as wireless local area networks (WLAN).

IEEE802.15.4a(ieee802.15.4a标准的作用)

Task group 3 (High Rate WPAN)

(High Rate WPAN)

IEEE 802.15.3-2003 is a MAC and PHY standard for high-rate (11 to 55 Mb/s) WPANs.

3a (WPAN High Rate Alternative PHY)

IEEE 802.15.3a was an attempt to provide a higher speed UWB PHY enhancement amendment to IEEE 802.15.3 for applications which involve imaging and multimedia.

The IEEE 802.15.3a most commendable achievement was the consolidation of 23 UWB PHY specifications into two proposals using : Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) UWB, supported by the WiMedia Alliance, and Direct Sequence - UWB (DS-UWB), supported by the UWB Forum.

On January 19, 2006 IEEE 802.15.3a task group (TG3a) members voted to withdraw the December 2002 project authorization request (PAR) that initiated the development of high data rate UWB standards. The process was in total deadlock. There were two technology proposals on the table backed by two different industry alliances. One of them was willing to move forward with a joint proposal the other was not and had sufficient votes to block forward progress. The task group finally agreed to duke it out in the market place. The Working Group concurred. The technology faces significant regulatory hurdles in addition. This was not a factor in this decision but from a standards perspective it probably was and is too early to write a UWB standard given the regulatory and market uncertainty in the world market. If there is a surviving approach in a year or two and the technology has proven itself to be commercially viable, then IEEE can come back and revisit whether it makes sense to create an IEEE standard.

3b (MAC Amendment)

The IEEE 802.15.3.b is working on an amendment to 802.15.3 to improve implementation and interoprability of the MAC. This will include minor optimizations while preserving backward compatibility. In addition, this amendment will correct errors, clarify ambiguities, and add editorial clarifications.

3c (WPAN Millimeter Wave Alternative PHY)

The IEEE 802.15.3 Task Group 3c (TG3c) was formed in March 2005. TG3c is developing a millimeter-wave-based alternative physical layer (PHY) for the existing 802.15.3 Wireless Personal Area Network (WPAN) Standard 802.15.3-2003.

This mmWave WPAN will operate in the new and clear band including 57-64 GHz unlicensed band defined by FCC 47 CFR 15.255. The millimeter-wave WPAN will allow high coexistence (close physical spacing) with all other microwave systems in the 802.15 family of WPANs

In addition, the millimeter-wave WPAN will allow very high data rate over 2 Gbit/s applications such as high speed internet access, streaming content download (video on demand, HDTV, home theater, etc.), real time streaming and wireless data bus for cable replacement. Optional data rates in excess of 3 Gbit/s will be provided.

Task group 4 (Low Rate WPAN)

4 (Low Rate WPAN)

IEEE 802.15.4-2003 (Low Rate WPAN) deals with low data rate but very long battery life (months or even years) and very low complexity. The first edition of the 802.15.4 standard was released in May 2003. In March 2004, after forming Task Group 4b, task group 4 put itself in hibernation.

The ZigBee set of high level communication protocols is based upon the specification produced by the IEEE 802.15.4 taskgroup.

4a (WPAN Low Rate Alternative PHY)

The principle interest is in providing communications and high precision ranging / location capability (1 meter accuracy and better), high aggregate throughput, and ultra low power; as well as adding scalability to data rates, longer range, and lower power consumption and cost.

In March 2005, IEEE802.15.4a selected a baseline specification. The baseline is two optional PHYs consisting of a UWB Impulse Radio (operating in unlicensed UWB spectrum) and a Chirp Spread Spectrum (operating in unlicensed 2.4GHz spectrum). The UWB Impulse Radio will be able to deliver communications and high precision ranging.

4b (Revisions and Enhancements)

The IEEE 802.15 task group 4b was chartered to create a project for specific enhancements and clarifications to the IEEE 802.15.4-2003 standard, such as resolving ambiguities, reducing unnecessary complexity, increasing flexibility in security key usage, considerations for newly available frequency allocations, and others. IEEE 802.15.4b has been apprvoed in June 2006 and is expected for publication in September.

Task group 5 (Mesh Networking)

Mesh Networking of Wireless Personal Area Networks (WPANs)

BAN

Body Area Network Interest Group

WNG

Wireless Next Generation Standing Committee