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网络同步协议和要求规格整理-20220525.pdf
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网络同步协议和要求规格整理,包括ITU-T G.826x和G.827x协议簇,整理PTP角色在ITU协议中对应关系,wander,jitter测量标准,以及各种索引
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网络同步协议和要求规格整理!
ITU-T
系列协议规格要求整理
1 Terminology & Abbreviation
简写
说明
Reference &
Chapter
T-GM
Telecom Grand Master,电信主钟
G8271
T-TC
Telecom Transparent Clock,电信网络透明时钟(节点)
G8271
T-TSC
Telecom Time Slave Clock,电信从时钟
G.8271
PRTC
Primary Reference Time Clock 主参考时钟(节点)
G.8272
PRC
Primary Reference Clock
G.8266
FTS
Full Timing Support 全时间支持网络
Packet-based method (frequency or time and/or phase
synchronization) requiring that all the network nodes on the path
of the synchronization flow implement one of the two following
types of timing support:
• termination and regeneration of the timing [e.g., network time
protocol (NTP) stratum clocks, precision time protocol (PTP)
boundary clock];
• a mechanism to correct for the delay introduced by the network
node or the connected links (e.g., PTP transparent clock).
G8271.1
Clause 3.1.7
of ITU-T
G.8260
PTS
Partial Timing Support 部分时间支持网络
Packet-based method (frequency or time and/or phase
synchronization) where not all of the network nodes on the path
of the synchronization flow implement timing support
G8271.2,
Clause 3.1.8
of ITU-T
G.8260
PLFS
Physical Layer Frequency Synchronization 物理层频率同步
(一般指 SyncE 技术)
TE(t)
对同一段时间(t),使用待测时钟得到的时间和使用参考
时钟得到的时间的差值
G.810
EEC
Synchronous Ethernet Equipment Clock
G.8261
2 / 46
简写
说明
Reference &
Chapter
eEEC
Enhanced Synchronous Ethernet Equipment Clock
G.8261.1
PEC-S-F
Packet-based Equipment Clock-Slave-Frequency
G.8263
PDV
Packet Delay Variation
G.8263
PEC-M
Packet-based Equipment Clock-Master
G.8263
PEC-S
Packet-based Equipment Clock-Slave
G.8263
Pull-in
range
The largest offset between a slave clock’s reference frequency
and a specified nominal frequency, within which the slave
clock will achieve locked mode
G.810
Pull-out
range
The offset between a slave clock’s reference frequency and a
specified nominal frequency, within which the slave clock
stays in the locked mode and outside of which the slave clock
cannot maintain locked mode, irrespective of the rate of the
frequency change
G.810
Hold-in
range
The largest offset between a slave clock’s reference frequency
and a specified nominal frequency, within which the slave
clock maintains lock as the frequency varies arbitrarily slowly
over the frequency range.
G.810
2
时间相位的精度定义
表
2-1 G.8271
要求摘录
准确度等级分类!
TimeError 要求!
典型应用场景!
1
500ms
告警,广播
2
100-500us
IP 延迟监控,同步信号
3
5us
LTE TDD,同步双联接网络
4
1.5us
UTRA-TDD, LTE-TDD(small cell),NR TDD,
WIMAX-TDD,5G(NR)
5
1us
WiMax-TDD
6
x ns
各种更高精度要求应用(一般为本地应用)
3 / 46
准确度等级分类!
TimeError 要求!
典型应用场景!
3A
5us
LTE MBSFN(多播单频网络)
4A
3us
5G(NR)
6A
260ns
LTE,5G(NR)!intra-band
6B
130ns
LTE intra-band contiguous carrier aggregation
6C
65ns
LTE,!NR MIMO
表
2-2 Wireless synchronization requirements(2g/3g/4g)
Radio Technology
Frequency Sync
Time/Phase Sync
GSM
50-100ppb
CDMA2000
3-10us
UMTS/WCDMA-FDD
50-100ppb
WCDMA-TDD
3us
LTE-FDD
50-100ppb
LTE-TDD
50-100ppb
3-10us
3
整体标准体系概述
"#$% ITU-T &'()*+,-./!
4 / 46
!
图
3-1 G.82xx
标准体系
3.1 G.82XX
!"#$%&
ITU-T G.8261: Timing and Synchronization aspects in packet networks
ITU-T G.8261.1: Packet Delay Variation Network Limits Applicable to Packet-based methods
ITU-T G.8262: Timing Characteristics of Synchronous Ethernet Equipment Slave Clock
ITU-T G.8263: Timing Characteristics of packet-based equipment clocks PEC-M and PEC-S for
master and slave functions
ITU-T G.8264: Distribution of timing information through packet networks
ITU-T G.8265: Architecture and requirements for packet-based frequency delivery
ITU-T G.8266: Timing Characteristics of telecom grandmaster clocks for frequency
synchronization
ITU-T G.8271: Time and Phase Synchronization aspects of packet networks
ITU-T G.8271.1: Network Limits for time synchronization in packet networks
ITU-T G.8271.2: Network limits for time synchronization in packet networks with partial timing
support from the network
ITU-T G.8272: Timing characteristics of primary reference time clocks PRTC
ITU-T G.8273: Framework of phase and time clocks
ITU-T G.8273.1: Framework of phase and time clocks-Telecom grand master
5 / 46
ITU-T G.8273.2: Timing characteristics of telecom boundary clocks and telecom time slave clocks
for use with full timing support from the network
ITU-T G.8273.3: Timing Characteristics of telecom transparent clocks for use with full timing
support from the network
ITU-T G.8273.4: Timing Characteristics of telecom boundary clocks and telecom time slave clocks
for use with partial timing support from the network
ITU-T G.8275: Architecture and requirements for packet-based time and phase distribution
ITU-T G.8275.1: Precision time protocol profile for phase/time synchronization with full timing
support the network
ITU-T G.8275.2: Precision time protocol telecom profile for phase/time synchronization with
partial timing support from the network
ITU-T G.8365.1: Precision Time Protocol telecom profile for frequency synchronization
3.2
'()*+,-./0
3.2.1 T-REC-G.810
《DEFINITIONS AND TERMINOLOGY FOR SYNCHRONIZATION NETWORKS》
定义时间频率相关的技术术语,包括:
Error
Slips
Jitter
Wander
Structure of synchronization networks
3.3
1234567+,89:;<=>?@
Appendix II of ITU-T
G.8271-2020
A
表
3-1
时间相位终端应用场景要求
1
应用技术场景
准确度要求
标准/规范
CDMA2000
±3 μs with respect to CDMA System
Time, which uses the GPS timescale
(which is traceable and synchronous
to UTC except for leap second
corrections).
[b-3GPP2 C.S0002] clause 1.3
[b-3GPP2 C.S0010] clause
4.2.1.1
1
NOTE 1 –在移动应用中,这些技术要求都是针对“基站-基站”之间的偏移,如果考虑单站的设
计,则需要将表中指标除以2.
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