eCPRI Specification V2

1 eCPRI Specification (2019-05-10) 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 BY USING THE eCPRI Specification , YOU ACCEPT THE Interface Specification Download Terms and Conditions FOUND AT 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.

2 2019 Ericsson AB, Huawei Technologies Co. Ltd, NEC Corporation and Nokia. CPRI eCPRI Specification (2019-05-10) 2 Table of Contents 1 1. Introduction .. 4 2 2. System Description .. 6 3 Definitions/Nomenclature .. 6 4 System Architecture .. 8 5 Functional Description .. 9 6 Functional Decomposition .. 10 7 3. Interface Specification .. 11 8 Protocol Overview .. 11 9 Physical Layer .. 13 10 User Plane .. 13 11 User Plane over Ethernet .. 13 12 User Plane over IP .. 14 13 eCPRI Message Format.

3 14 14 eCPRI Transmission Byte Order .. 15 15 Common Header .. 15 16 eCPRI Payload .. 16 17 Mapping Examples .. 16 18 Message Types .. 17 19 Message Type #0: IQ Data .. 17 20 Message Type #1: Bit Sequence .. 19 21 Message Type #2: Real-Time Control Data .. 21 22 Message Type #3: Generic Data Transfer .. 22 23 Message Type #4: Remote Memory Access .. 24 24 Message Type #5: One-Way Delay Measurement .. 28 25 Message Type #6: Remote Reset .. 34 26 Message Type #7: Event Indication .. 36 27 Message Type #8: IWF Start-Up.

4 41 28 Message Type #9: IWF Operation .. 43 29 Message Type #10: IWF Mapping .. 51 30 Message Type #11: IWF Delay Control .. 56 31 Message Type #12 - #63: Reserved .. 57 32 Message Type #64 - #255: Vendor Specific .. 57 33 C&M Plane .. 57 34 Synchronization Plane .. 58 35 QoS .. 58 36 VLAN Tagging for Ethernet-switched fronthaul networks .. 58 37 QoS for IP-routed fronthaul networks .. 58 38 4. Forward and Backward Compatibility .. 59 39 Fixing eCPRI Protocol Revision Position .. 59 40 Reserved Bits and Value Ranges within eCPRI .

5 59 41 eCPRI Specification release version .. 59 42 Specification release version mapping to eCPRI protocol revision .. 59 43 5. Compliance .. 61 44 6. Annex A - Supplementary Specification Details (Informative) .. 62 45 Functional Decomposition .. 62 46 eCPRI Functional Decomposition .. 62 47 Bit Rate Calculations / Estimations .. 64 48 Bit Rate Calculation 64 49 Synchronization and Timing .. 65 50 CPRI eCPRI Specification (2019-05-10) 3 Synchronization of eRE .. 65 1 Synchronization of 65 2 Synchronization of IWFs.

6 65 3 Link Delay Management .. 65 4 Reference Points for Delay Measurement .. 66 5 Delay Management example .. 70 6 Network Connection Maintenance .. 72 7 Networking .. 73 8 Difference between eCPRI and CPRI .. 73 9 eCPRI /CPRI networking with eCPRI /CPRI IWF type 0 .. 74 10 eCPRI /CPRI networking with eCPRI /CPRI IWF type 1 and type 2 .. 75 11 Priority considerations .. 76 12 Message Ordering Considerations .. 76 13 Security .. 77 14 eCPRI Network Security Protocol .. 77 15 eCPRI Network Security Specification .

7 77 16 User plane .. 77 17 C&M plane .. 77 18 Synchronization 77 19 7. Annex B eCPRI /CPRI Interworking with IWF type 0 (Informative) .. 78 20 Concept .. 80 21 Bridging of User Plane .. 81 22 Bridging/Routing of C&M Plane .. 82 23 Bridging of Synchronization Plane .. 83 24 Bridging of L1 inband protocol .. 83 25 Start-up Sequence .. 84 26 8. Annex C eCPRI /CPRI Interworking with IWF type 1 and type 2 .. 85 27 Concept .. 85 28 Definition of IWF type 1 and IWF type 2 CPRI ports .. 85 29 Bridging of User Plane.

8 86 30 Bridging/Routing of CPRI Control Words .. 86 31 Bridging of Synchronization Plane .. 86 32 Bridging/handling of CPRI sub-channels 0 and 2 .. 87 33 Start-up Sequence .. 87 34 eCPRI /CPRI IWF Start-up sequence overview .. 87 35 Start-up Delay Management .. 88 36 IWF CPRI port start-up sequence .. 90 37 General .. 90 38 Layer 1 Start-up Timer .. 90 39 State Description .. 91 40 Transition Description .. 95 41 Synchronization .. 97 42 Delay Management .. 97 43 Handling of eCPRI Remote Reset and CPRI Reset.

9 100 44 Link and Fault Management .. 100 45 IWF CPRI transmitter fault recovery/actions for CPRI detected 46 faults .. 102 47 IWF CPRI transmitter fault recovery/actions for Ethernet detected 48 faults .. 102 49 9. List of Abbreviations .. 104 50 10. References .. 107 51 11. History .. 108 52 53 CPRI eCPRI Specification (2019-05-10) 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.

10 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 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.