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首页eCPRI最新版本V1.2协议规范
eCPRI最新版本V1.2协议规范,发布于2018年6月25日,公共无线电接口 (cpri) 是一种行业合作, 旨在为无线电基站的关键内部接口定义公开的规格, 例如连接 ecpri 无线电设备控制 (erec) 和 ecpri 无线电的 ecpri 接口设备 (ere) 通过所谓的前端传输网络。合作定义规格的各方有爱立信 ab、华为技术有限公司、nec 公司和诺基亚。
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eCPRI presentation
Common Public Radio Interface
Background 1/2
1. Operator view of CPRI features
Although CPRI has been the main Fronthaul interface standard, many operators started
to question its suitability to high bandwidth 5G use cases.
Improvements to efficiency and link capacity utilization were requested.
Also advanced networking and OAM features of mainstream packet transport
standards were requested.
Background 2/2
2. High risk of Fragmentation for FH Standardization
An increasing number of proposals for a new functional splits between the baseband
and radio started to emerge.
Several standardization bodies announced activities to define new Fronthaul
Interfaces.
PDCP
Low -
RLC
High -
MAC
Low -
MAC
High -
PHY
Low -PHY
PDCP
Low -
RLC
High -
MAC
Low -
MAC
High -
PHY
Low -PHY
Option 54 Option 6 Option 7
Option 2
Option 1
RRC
RRC
RF
RF
Option 8
Data
Data
High -
RLC
High -
RLC
Option 3
Option
Options in 3GPP RAN3 discussions (refer to TR 38.801)
Targets agreed for the new CPRI
Specification:
1. Significant reduction of required bandwidth
2. More efficient utilization of available
bandwidth
3. Enable evolution for radio processing and
support of sophisticated coordination
algorithms to guarantee best possible radio
performance
4. Carefully select the functionalities of the radio
unit in order to enable evolution by SW
updates and long life span of the radio units
5. Utilize existing main stream technologies to
minimize duplicated specification work
6. Encourage utilization of existing technologies
for OAM and networking
7. Be first to the market , becoming the
prevailing fronthaul standard and minimizing
fronthaul standards fragmentation
1. ~10 fold reduction of required bandwidth
2. Required bandwidth can scale flexibly
according to the user plane traffic
3. Functional split inside PHY layer enables
support of sophisticated coordination
algorithms
4. Split in PHY keeps most of the functionality in
baseband enabling new feature introduction
without changes in the radio equipment
5. Encourage utilization of Ethernet and IP , thus
guaranteeing future evolution
6. Use of Ethernet/IP technologies encouraged
7. eCPRI specification V1.0 published and openly
available to download from www.cpri.info
eCPRI key Features:
What is CPRI?
CPRI reminder
• A digital interface standard to transport antenna samples between a Radio Equipment (RE) and
a Radio Equipment Control (REC) performing the digital processing of these signals
• Antennas signals are interleaved in a TDM-like fashion supported by a Constant Bit Rate
transport solution
• CPRI v7.0 bit rates range from 614 Mbit/s (Rate 1) up to 24330 Mbit/s (Rate 10)
• Mix of Radio Access Technologies is supported
• Provide time and synchronization information for the Radio Air Interface
• Originally specified for point-to-point topology
• Maximum latency assuming no intermediate nodes
• Multipoint topologies supported but networking management left to the application layer
• Interoperability limited to the low layers covered by the specification
• CPRI define how to exchange the radio signal data not the data content itself nor the
associated management plane
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