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eCPRI Specification V1.0
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The Common Public Radio Interface (CPRI) is an industry cooperation aimed at defining publicly available specifications for the key internal interface of radio base stations, such as eCPRI connecting the eCPRI Radio Equipment Control (eREC) and the eCPRI Radio Equipment (eRE) via a so-called fronthaul transport network.
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eCPRI Specification V1.0 (2017-08-22)
Interface Specification
Common Public Radio Interface:
eCPRI Interface Specification
The eCPRI specification has been developed by Ericsson AB, Huawei Technologies Co. Ltd, NEC Corporation and Nokia (the “Parties”) and may
be updated from time to time. Further information about eCPRI, and the latest specification, may be found at http://www.cpri.info
BY USING THE CPRI SPECIFICATION, YOU ACCEPT THE “Interface Specification Download Terms and Conditions” FOUND AT
http://www.cpri.info/spec.html
IN ORDER TO AVOID ANY DOUBT, BY DOWNLOADING AND/OR USING THE ECPRI SPECIFICATION NO EXPRESS OR IMPLIED
LICENSE AND/OR ANY OTHER RIGHTS WHATSOEVER ARE GRANTED FROM ANYBODY.
© 2017 Ericsson AB, Huawei Technologies Co. Ltd, NEC Corporation and Nokia.
.
CPRI
eCPRI Specification V1.0 (2017-08-22)
2
Table of Contents
1
1. Introduction ................................................................................................................. 4
2
2. System Description .................................................................................................... 5
3
2.1. Definitions/Nomenclature ............................................................................. 5
4
2.2. System Architecture ..................................................................................... 6
5
2.3. Functional Description ................................................................................. 7
6
2.3.1. Functional Decomposition ................................................................. 8
7
3. Interface Specification .............................................................................................. 10
8
3.1. Protocol Overview ....................................................................................... 10
9
3.1.1. Physical Layer ................................................................................. 12
10
3.2. User Plane ................................................................................................... 12
11
3.2.1. User Plane over Ethernet ................................................................ 12
12
3.2.2. User Plane over IP .......................................................................... 13
13
3.2.3. eCPRI Message Format .................................................................. 13
14
3.2.3.1. eCPRI Transmission Byte Order ............................... 14
15
3.2.3.2. Common Header ...................................................... 14
16
3.2.3.3. eCPRI Payload ......................................................... 15
17
3.2.3.4. Mapping Examples ................................................... 15
18
3.2.4. Message Types ............................................................................... 16
19
3.2.4.1. Message Type #0: IQ Data ....................................... 16
20
3.2.4.2. Message Type #1: Bit Sequence .............................. 18
21
3.2.4.3. Message Type #2: Real-Time Control Data .............. 20
22
3.2.4.4. Message Type #3: Generic Data Transfer ................ 21
23
3.2.4.5. Message Type #4: Remote Memory Access ............. 23
24
3.2.4.6. Message Type #5: One-Way Delay Measurement .... 27
25
3.2.4.7. Message Type #6: Remote Reset ............................. 33
26
3.2.4.8. Message Type #7: Event Indication .......................... 35
27
3.2.4.9. Message Type #8-#63: Reserved ............................. 40
28
3.2.4.10. Message Type #64-#255: Vendor Specific ................ 40
29
3.3. C&M Plane ................................................................................................... 41
30
3.4. Synchronization Plane ................................................................................ 41
31
3.5. QoS .............................................................................................................. 41
32
3.5.1. VLAN Tagging for Ethernet-switched fronthaul networks ................. 41
33
3.5.2. QoS for IP-routed fronthaul networks .............................................. 41
34
4. Forward and Backward Compatibility ..................................................................... 42
35
4.1. Fixing eCPRI Protocol Revision Position .................................................. 42
36
4.2. Reserved Bits and Value Ranges within eCPRI ........................................ 42
37
4.3. eCPRI specification release version .......................................................... 42
38
4.4. Specification release version mapping to eCPRI protocol revision ........ 42
39
5. Compliance ............................................................................................................... 43
40
6. Annex A - Supplementary Specification Details (Informative) .............................. 44
41
6.1. Functional Decomposition ......................................................................... 44
42
6.1.1. eCPRI Functional Decomposition .................................................... 44
43
6.1.2. Bit rate calculations / estimations ..................................................... 45
44
6.2. Synchronization and Timing ...................................................................... 47
45
6.2.1. Synchronization of eRE ................................................................... 47
46
6.2.2. Synchronization of eREC................................................................. 47
47
6.3. Link Delay Management ............................................................................. 47
48
6.3.1. Reference Points for Delay Measurement ....................................... 48
49
6.3.2. Delay Management example ........................................................... 52
50
6.4. Network Connection Maintenance ............................................................. 54
51
6.5. Networking .................................................................................................. 55
52
CPRI
eCPRI Specification V1.0 (2017-08-22)
3
6.5.1. Difference between eCPRI and CPRI .............................................. 55
1
6.6. Priority considerations ............................................................................... 56
2
6.7. Message Ordering Considerations ............................................................ 56
3
6.8. Security ........................................................................................................ 57
4
6.8.1. eCPRI Network Security Protocol .................................................... 57
5
6.8.2. eCPRI Network Security Specification ............................................. 57
6
6.8.2.1. User plane ................................................................ 57
7
6.8.2.2. C&M plane ................................................................ 57
8
6.8.2.3. Synchronization plane............................................... 57
9
7. List of Abbreviations ................................................................................................ 58
10
8. References ................................................................................................................ 61
11
9. History ....................................................................................................................... 62
12
13
CPRI
eCPRI Specification V1.0 (2017-08-22)
4
1. Introduction
1
The Common Public Radio Interface (CPRI) is an industry cooperation aimed at defining publicly available
2
specifications for the key internal interface of radio base stations, such as eCPRI connecting the eCPRI
3
Radio Equipment Control (eREC) and the eCPRI Radio Equipment (eRE) via a so-called fronthaul transport
4
network. The parties cooperating to define the specification are Ericsson AB, Huawei Technologies Co. Ltd,
5
NEC Corporation and Nokia.
6
7
Motivation for eCPRI:
8
Compared to the CPRI [1], eCPRI makes it possible to decrease the data rate demands between eREC and
9
eRE via a flexible functional decomposition while limiting the complexity of the eRE.
10
11
Scope of Specification:
12
The necessary items for transport, connectivity and control are included in the specification. This includes
13
User Plane data, Control and Management Plane transport mechanisms, and means for synchronization.
14
The eCPRI specification will support 5G and enables increased efficiency in order to meet the needs
15
foreseen for 5G Mobile Networks. In contrast to CPRI, the eCPRI specification supports more flexibility in the
16
positioning of the functional split inside the Physical Layer of the cellular base station.
17
The scope of the eCPRI specification is to enable efficient and flexible radio data transmission via a packet
18
based fronthaul transport network like IP or Ethernet. eCPRI defines a protocol layer which provides various
19
- mainly user plane data specific - services to the upper layers of the protocol stack.
20
The specification has the following scope (see Figure 1):
21
1. The internal radio base station interface establishing a connection between ‘eCPRI Radio Equipment
22
Control’ (eREC) and ‘eCPRI Radio Equipment’ (eRE) via a packet based transport network is
23
specified.
24
2. Three different information flows (eCPRI User Plane data, C&M Plane data, and Synchronization
25
Plane data) are transported over the interface.
26
3. The specification defines a new eCPRI Layer above the Transport Network Layer. Existing standards
27
are used for the transport network layer, C&M and Synchronization.
28
29
eCPRI Radio Equipment Control (eREC)
eCPRI
specific
User Plane
Sync
Control
& Mgmnt
eCPRI Radio Equipment (eRE)
Transport Network Layer
Standard
Protocols
SAP
U
SAP
S
SAP
CM
eCPRI
specific
User Plane Sync
Control
& Mgmnt
Transport Network Layer
Standard
Protocols
SAP
U
SAP
S
SAP
CM
Transport Network
30
Figure 1: System and Interface Definition
31
32
CPRI
eCPRI Specification V1.0 (2017-08-22)
5
2. System Description
1
This section describes the eCPRI related parts of the basic radio base station system architecture and
2
defines the mapping of the functions to the different nodes. Furthermore, the reference configurations and
3
the basic nomenclature used in the following sections are defined.
4
The following description is based on the Evolved UMTS Terrestrial Radio Access (E-UTRA) and 5G.
5
However, the interface may also be used for other radio standards.
6
2.1. Definitions/Nomenclature
7
This section provides the basic nomenclature that is used in the following sections.
8
9
eCPRI node:
10
The radio base station system is composed of two basic eCPRI nodes, the eCPRI Radio Equipment Control
11
and the eCPRI Radio Equipment (see Figure 1). The eCPRI Radio Equipment Control and the eCPRI Radio
12
Equipment are described in the following chapter. The radio base station system shall contain at least two
13
eCPRI nodes, at least one of each type: eREC and eRE.
14
eREC / eRE element:
15
A hardware or software component within an eCPRI node which alone does not constitute a full eCPRI node.
16
Protocol planes:
17
The following planes are outlined:
18
C&M Plane: Control and Management data flow for the operation, administration and
19
maintenance of the nodes.
20
User Plane: Three data flows covered by the user plane:
21
a) Data flow to be transferred from the radio base station to the User
22
Equipment (UE) and vice versa.
23
b) Real time control data related to a).
24
c) Other eCPRI flows not covered by other protocol planes/flows.
25
Synchronization Plane: Data flow for synchronization and timing information between nodes.
26
eCPRI Protocol Layer:
27
A Protocol Layer defined by this specification and providing specific services to the upper layers.
28
Service Access Points:
29
For all protocol planes except Connection OAM, service access points are defined. These service access
30
points are denoted as SAP
CM
, SAP
S
and SAP
U
as illustrated in Figure 1. A service access point is defined on
31
a per logical connection basis.
32
Logical connection:
33
A “logical connection” defines the interconnection between SAPs (e.g., SAP
U
) across peered eCPRI nodes.
34
Grandmaster Clock (GM):
35
Reference clock of a Precision Time Protocol-based Transport network. The GM can be located in the
36
network as well as in the eREC or eRE.
37
Downlink:
38
Direction from eNB/gNB to UE.
39
Uplink:
40
Direction from UE to eNB/gNB.
41
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