IEEE 802.1AS-2011: 时间同步在局域网中的应用

5星 · 超过95%的资源需积分: 50 198 浏览量更新于2024-07-09 1 收藏 3.31MB PDF 举报

"IEEE 802.1AS-2011.pdf 是一份关于‘Timing and Synchronization for Time-Sensitive Applications in Bridged Local Area Networks’的文档，由IEEE LAN/MAN Standards Committee赞助发布。这份标准详细阐述了在局域网和城域网中时间敏感应用的时钟同步技术，对自动驾驶、gPTP（通用精确时间协议）以及车载以太网等领域的通信具有重要意义。" 《IEEE Std 802.1AS-2011》是IEEE制定的一项标准，专门针对局部和大都市区网络中的时间同步和定时服务，适用于那些需要高度精确时间戳的应用，如时间敏感网络(TSN)。该标准旨在提升网络性能，确保数据传输的精确性和可靠性，特别是在实时和低延迟的环境中，如工业自动化、汽车电子系统、音频视频流传输等。在自动驾驶领域，精确的时间同步是至关重要的，因为它涉及到传感器数据的同步、定位和路径规划、车辆间通信（V2X）以及与交通基础设施的交互。例如，多个车辆或传感器需要精确同步，以确保它们在同一时间点捕获的数据能够准确无误地融合，从而实现更安全的自动驾驶决策。 gPTP（通用精确时间协议，Generic Precision Time Protocol）是802.1AS标准的核心部分，它扩展了IEEE 1588标准，提供了更高级别的时钟同步精度。gPTP允许网络中的设备之间进行亚微秒级的时间同步，这对于高速数据传输和处理的实时应用至关重要。在车载以太网中，gPTP可以确保所有车载电子模块在同一时间基准下工作，避免因时间不一致导致的通信错误或功能失效。此外，这份标准还涵盖了桥接本地区域网络的架构，定义了如何在网络中传播和校准时间，以及如何处理各种潜在的同步问题，如网络延迟、跳数限制和路径变化。它还规定了相关的管理信息库(MIB)和管理接口，使得网络管理员能够监控和调整网络的同步状态。总结来说，《IEEE Std 802.1AS-2011》对于构建高性能、时间敏感的网络系统，特别是对自动驾驶技术和车载以太网的发展起到了关键作用。通过实施该标准，工程师可以设计出更可靠、更精确的网络解决方案，满足现代通信对时间同步的严格要求。

Figure E.4—Propagation delay and residence time over a CSN Backbone................................................ 262

Figure E.5—CSN node-to-node path delay measurement........................................................................... 263

Figure E.6—IEEE 802.1AS Sync Message Propagation over the CSN backbone ..................................... 265

List of tables

Table 6-1—Primitive data types .................................................................................................................... 15

Table 8-1—Illustration of formation of clockIdentity from EUI-48 ............................................................. 31

Table 8-2—Default values for priority1, for the respective media................................................................33

Table 8-3—timeSource enumeration............................................................................................................. 36

Table 10-1—Port role definitions .................................................................................................................. 68

Table 10-2—Destination address for Announce and Signaling messages .................................................... 86

Table 10-3—Ethertype for Announce and Signaling messages .................................................................... 86

Table 10-4—PTP message header................................................................................................................. 88

Table 10-5—Values for messageType field .................................................................................................. 88

Table 10-6—Values of flag bits..................................................................................................................... 89

Table 10-7—Announce message fields ......................................................................................................... 90

Table 10-8—Path trace TLV ......................................................................................................................... 91

Table 10-9—Signaling message fields .......................................................................................................... 92

Table 10-10—Message interval request TLV ............................................................................................... 93

Table 10-11—Interpretation of special values of linkDelayInterval ............................................................. 94

Table 10-12—Interpretation of special values of timeSyncInterval.............................................................. 94

Table 10-14—Definitions of bits of flags field of message interval request TLV ........................................ 95

Table 10-13—Interpretation of special values of announceInterval.............................................................. 95

Table 11-1—Destination address for Sync, Follow_Up, Pdelay_Req, Pdelay_Resp,

and Pdelay_Resp_Follow_Up messages ..............................................................................................123

Table 11-2—Ethertype for Sync, Follow_Up, Pdelay_Req, Pdelay_Resp, and

Pdelay_Resp_Follow_Up messages ..................................................................................................... 123

Table 11-4—Values of flag bits................................................................................................................... 125

Table 11-3—Values for messageType field ................................................................................................ 125

Table 11-6—References for sequenceId value exceptions.......................................................................... 126

Table 11-7—Value of control field ............................................................................................................. 126

Table 11-5—Value of correction field......................................................................................................... 126

Table 11-8—Sync message fields................................................................................................................ 127

Table 11-9—Follow_Up message fields ..................................................................................................... 127

Table 11-10—Follow_Up information TLV ............................................................................................... 128

Table 11-11—Pdelay_Req message fields .................................................................................................. 129

Table 11-12—Pdelay_Resp message fields................................................................................................. 130

Table 11-13—Pdelay_Resp_Follow_Up message fields ............................................................................ 130

Table 12-1—Parameters of MLME-TIMINGMSMT.request..................................................................... 139

Table 12-2—Parameters of MLME-TIMINGMSMST.confirm ................................................................ 140

Table 12-3—Parameters of MLME-TIMINGMSMT.indication ................................................................ 143

Table 12-4—Values of the Type field in the VendorSpecific information element.................................... 144

Table 13-1—TIMESYNC message fields ................................................................................................... 150

Table 14-1—Default Parameter Data Set Table .......................................................................................... 162

Table 14-2—Current Parameter Data Set Table.......................................................................................... 163

Table 14-3—Parent Parameter Data Set Table............................................................................................ 165

Table 14-4—Time Properties Parameter Data Set Table ............................................................................ 166

Table 14-5—portRole enumeration ............................................................................................................. 167

Table 14-6—Port Parameter Data Set Table ............................................................................................... 170

Table 14-7—Port Parameter Statistics Table.....................................................................................

.......... 173

Table 14-8—Acceptable Mas

er Table Parameter Data Set Table.............................................................. 174

Table 15-1—IEEE8021-AS MIB structure and object cross reference....................................................... 177

Table B.1—Wander generation TDEV requirement for LocalClock entity................................................ 246

Table B.2—ADEV limit corresponding to wander generation requirement of Table B.1.......................... 247

Table B.3—PTPDEV limit corresponding to wander generation requirement of Table B.1 ...................... 248

剩余291页未读，继续阅读

悟空一根葱

粉丝: 0
资源: 1

IEEE 802.1AS-2011: 时间同步在局域网中的应用

IEEE802.1AS.pdf

802.1AS-2011.pdf

8021AS-2011.pdf

ieee 802.1as-2011.pdf

IEEE 802.1AS-2020.pdf

IEEE Std 802.1AS-2011 桥接局域网中时间敏感应用的定时和同步.pdf

IEEE Std 802.1AS-2020.pdf.7z

IEEE 802.1Qcp-2018.pdf

IEEE 802.1Qat-2010.pdf

IEEE 802.1AS-2011标准：时间同步在桥接局域网中的应用

最新资源