--- /dev/null
+.. Copyright (c) 2019 Intel
+..
+.. Licensed under the Apache License, Version 2.0 (the "License");
+.. you may not use this file except in compliance with the License.
+.. You may obtain a copy of the License at
+..
+.. http://www.apache.org/licenses/LICENSE-2.0
+..
+.. Unless required by applicable law or agreed to in writing, software
+.. distributed under the License is distributed on an "AS IS" BASIS,
+.. WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+.. See the License for the specific language governing permissions and
+.. limitations under the License.
+
+.. |br| raw:: html
+
+ <br />
+
+Transport Layer and ORAN Fronthaul Protocol Implementation
+==========================================================
+
+.. contents::
+ :depth: 3
+ :local:
+
+This chapter describes how the transport layer and ORAN Fronthaul
+protocol are implemented.
+
+.. _introduction-2:
+
+Introduction
+------------
+
+Figure 8 presents an overview of the ORAN Fronthaul process.
+
+.. image:: images/ORAN-Fronthaul-Process.jpg
+ :width: 600
+ :alt: Figure 8. ORAN Fronthaul Process
+
+Figure 8. ORAN Fronthaul Process
+
+The XRAN library provides support for transporting In-band and
+Quadrature (IQ) samples between the O-DU and O-RU within the RAN
+architecture based on functional split 7.2x. The library defines the
+xRAN packet formats to be used to transport radio samples within Front
+Haul according to the ORAN Fronthaul specification. It provides
+functionality for generating xRAN packets, appending IQ samples in the
+packet payload, and extracting IQ samples from xRAN packets. The Bronze release version
+of the library supports U-plane and C-plane only. It is ready to
+be used in the PTP synchronized |br|
+environment.
+
+Regarding the clock model and synchronization topology, configurations
+C1 and C3 of the connection between O-DU and O-RU are the only
+configurations supported in this release of the xRAN implementation.
+
+Quality of PTP synchronization with respect to S-plane of ORAN Fronthaul
+requirements as defined for O-RU is out of the scope of this document.
+PTP master and PTP slave configuration are expected to satisfy only the
+O-DU side of |br|
+requirements and provide the “best-effort” PTP master for
+O-RU. This may or may not be sufficient for achieving the end to end
+system requirements of S-plane. Specialized dedicated NIC card with
+additional HW functionality might be |br|
+required to achieve PTP master
+functionality to satisfy O-RU precision requirements for RAN deployments
+scenarios.
+
+.. image:: images/Configuration-C1.jpg
+ :width: 600
+ :alt: Figure 9. Configuration C1
+
+Figure 9. Configuration C1
+
+
+.. image:: images/Configuration-C3.jpg
+ :width: 600
+ :alt: Figure 10. Configuration C3
+
+Figure 10. Configuration C3
+
+Supported Feature Set
+---------------------
+
+The ORAN Fronthaul specification defines a list of mandatory
+functionality. Not all features defined as Mandatory for |br|
+O-DU are
+currently supported to fully extended. The following tables contain
+information on what is available and the level of validation performed
+for this release.
+
+2. Cells with a red background are listed as mandatory in the
+specification but not supported in this implementation of xRAN.
+
+Table 7. ORAN Mandatory and Optional Feature Support
+
++-----------------+-----------------+-----------+----------------+
+| Category | Feature | O-DU | Support |
+| | | Support | |
++=================+=================+===========+================+
+| RU Category | Support for | Mandatory | Y |
+| | CAT-A RU (up to | | |
+| | 8 spatial | | |
+| | streams) | | |
++-----------------+-----------------+-----------+----------------+
+| | Support for | | N |
+| | CAT-A RU (> 8 | | |
+| | spatial | | |
+| | streams) | | |
++-----------------+-----------------+-----------+----------------+
+| | Support for | Mandatory | Y |
+| | CAT-B RU | | |
+| | (precoding in | | |
+| | RU) | | |
++-----------------+-----------------+-----------+----------------+
+| Beamforming | Beam Index | Mandatory | Y |
+| | based | | |
++-----------------+-----------------+-----------+----------------+
+| | Real-time BF | Mandatory | Y |
+| | Weights | | |
++-----------------+-----------------+-----------+----------------+
+| | Real-Time | | N |
+| | Beamforming | | |
+| | Attributes | | |
++-----------------+-----------------+-----------+----------------+
+| | UE Channel Info | | N |
++-----------------+-----------------+-----------+----------------+
+| Bandwidth | Programmable | Mandatory | Y |
+| Saving | s | | |
+| | tatic-bit-width | | |
+| | Fixed Point IQ | | |
++-----------------+-----------------+-----------+----------------+
+| | Real-time | | Y |
+| | var | | |
+| | iable-bit-width | | |
++-----------------+-----------------+-----------+----------------+
+| | Compressed IQ | | Y |
++-----------------+-----------------+-----------+----------------+
+| | Block floating | | Y |
+| | point | | |
+| | compression | | |
++-----------------+-----------------+-----------+----------------+
+| | Block scaling | | N |
+| | compression | | |
++-----------------+-----------------+-----------+----------------+
+| | u-law | | N |
+| | compression | | |
++-----------------+-----------------+-----------+----------------+
+| | modulation | | N |
+| | compression | | |
++-----------------+-----------------+-----------+----------------+
+| | beamspace | | N |
+| | compression | | |
++-----------------+-----------------+-----------+----------------+
+| | Variable Bit | | Y |
+| | Width per | | |
+| | Channel (per | | |
+| | data section) | | |
++-----------------+-----------------+-----------+----------------+
+| | Static | | N |
+| | configuration | | |
+| | of U-Plane IQ | | |
+| | format and | | |
+| | compression | | |
+| | header | | |
++-----------------+-----------------+-----------+----------------+
+| | Use of “symInc” | | N |
+| | flag to allow | | |
+| | multiple | | |
+| | symbols in a | | |
+| | C-Plane section | | |
++-----------------+-----------------+-----------+----------------+
+| Energy Saving | Transmission | | N |
+| | blanking | | |
++-----------------+-----------------+-----------+----------------+
+| O-DU - RU | Pre-configured | Mandatory | Y |
+| Timing | Transport Delay | | |
+| | Method | | |
++-----------------+-----------------+-----------+----------------+
+| | Measured | | N |
+| | Transport | | |
+| | Method (eCPRI | | |
+| | Msg 5) | | |
++-----------------+-----------------+-----------+----------------+
+| Synchronization | G.8275.1 | Mandatory | Y (C3 only)|
+| | | | |
++-----------------+-----------------+-----------+----------------+
+| | G.8275.2 | | N |
++-----------------+-----------------+-----------+----------------+
+| | GNSS based sync | | N |
++-----------------+-----------------+-----------+----------------+
+| | SyncE | | N |
++-----------------+-----------------+-----------+----------------+
+| Transport | L2 : Ethernet | Mandatory | Y |
+| Features | | | |
++-----------------+-----------------+-----------+----------------+
+| | L3 : IPv4, IPv6 | | N |
+| | (CUS Plane) | | |
++-----------------+-----------------+-----------+----------------+
+| | QoS over | Mandatory | N |
+| | Fronthaul | | |
++-----------------+-----------------+-----------+----------------+
+| | Prioritization | | N |
+| | of different | | |
+| | U-plane traffic | | |
+| | types | | |
++-----------------+-----------------+-----------+----------------+
+| | Support of | | N |
+| | Jumbo Ethernet | | |
+| | frames | | |
++-----------------+-----------------+-----------+----------------+
+| | eCPRI | Mandatory | Y |
++-----------------+-----------------+-----------+----------------+
+| | support of | | N |
+| | eCPRI | | |
+| | concatenation | | |
++-----------------+-----------------+-----------+----------------+
+| | IEEE 1914.3 | | N |
++-----------------+-----------------+-----------+----------------+
+| | Application | Mandatory | Y |
+| | fragmentation | | |
++-----------------+-----------------+-----------+----------------+
+| | Transport | | N |
+| | fragmentation | | |
++-----------------+-----------------+-----------+----------------+
+| Other | LAA LBT O-DU | | N |
+| | Congestion | | |
+| | Window mgmt | | |
++-----------------+-----------------+-----------+----------------+
+| | LAA LBT RU | | N |
+| | Congestion | | |
+| | Window mgmt | | |
++-----------------+-----------------+-----------+----------------+
+
+Details on the subset of xRAN functionality implemented are shown in
+Table 8.
+
+Level of Validation Specified as:
+
+
+- C: Completed code implementation for xRAN Library
+
+- I: Integrated into Intel FlexRAN PHY
+
+- T: Tested end to end with O-RU
+
+Table 8. Levels of Validation
+
++------------+------------+------------+------------+-----+-----+---+
+| Category | Item | Q4 (20.02) | | | | |
++============+============+============+============+=====+=====+===+
+| | | Status | C | I | T | |
++------------+------------+------------+------------+-----+-----+---+
+| General | Radio | NR | N/A | N/A | N/A | |
+| | access | | | | | |
+| | technology | | | | | |
+| | (LTE / NR) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Nominal | 15 | Y | Y | N | |
+| | s\ | /30/120KHz | | | | |
+| | ub-carrier | | | | | |
+| | spacing | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | FFT size | 512/1024 | Y | Y | N | |
+| | | /2048/4096 | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Channel | 5/10 | Y | Y | N | |
+| | bandwidth | /20/100Mhz | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Number of | 12 | Y | Y | N | |
+| | the | | | | | |
+| | channel | | | | | |
+| | (Component | | | | | |
+| | Carrier) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | RU | A | Y | Y | N | |
+| | category | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | TDD Config | Supporte\ | Y | Y | N | |
+| | | d/Flexible | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | FDD | Supported | Y | Y | N | |
+| | Support | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Tx/Rx | Supported | Y | Y | N | |
+| | switching | | | | | |
+| | based on | | | | | |
+| | 'data | | | | | |
+| | Direction' | | | | | |
+| | field of | | | | | |
+| | C-plane | | | | | |
+| | message | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | IP version | N/A | N/A | N/A | N/A | |
+| | for | | | | | |
+| | Management | | | | | |
+| | traffic at | | | | | |
+| | fronthaul | | | | | |
+| | network | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| PRACH | One Type 3 | Supported | Y | Y | N | |
+| | message | | | | | |
+| | for all | | | | | |
+| | repeated | | | | | |
+| | PRACH | | | | | |
+| | preambles | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Type 3 | 1 | Y | Y | N | |
+| | message | | | | | |
+| | per | | | | | |
+| | repeated | | | | | |
+| | PRACH | | | | | |
+| | preambles | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | timeOffset | Supported | Y | Y | N | |
+| | including | | | | | |
+| | cpLength | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Supported | Supported | Y | Y | N | |
++------------+------------+------------+------------+-----+-----+---+
+| | PRACH | Supported | Y | Y | N | |
+| | preamble | | | | | |
+| | format / | | | | | |
+| | index | | | | | |
+| | number | | | | | |
+| | (number of | | | | | |
+| | the | | | | | |
+| | occasion) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| Delay | Network | Supported | Y | Y | N | |
+| management | delay | | | | | |
+| | det\ | | | | | |
+| | ermination | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | lls-CU | Supported | Y | Y | N | |
+| | timing | | | | | |
+| | advance | | | | | |
+| | type | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Non-delay | Not | N | N | N | |
+| | managed | supported | | | | |
+| | U-plane | | | | | |
+| | traffic | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| C/U-plane | Transport | Ethernet | Y | Y | N | |
+| Transport | enc\ | | | | | |
+| | apsulation | | | | | |
+| | (Ethernet | | | | | |
+| | / IP) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Jumbo | Supported | Y | Y | N | |
+| | frames | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Transport | eCPRI | Y | Y | N | |
+| | header | | | | | |
+| | (eCPRI / | | | | | |
+| | RoE) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | IP version | N/A | N/A | N/A | N/A | |
+| | when | | | | | |
+| | Transport | | | | | |
+| | header is | | | | | |
+| | IP/UDP | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | eCPRI | Not | N | N | N | |
+| | Con\ | supported | | | | |
+| | catenation | | | | | |
+| | when | | | | | |
+| | Transport | | | | | |
+| | header is | | | | | |
+| | eCPRI | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | eAxC ID | 4 \* | Y | Y | N | |
+| | CU_Port_ID | | | | | |
+| | bitwidth | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | eAxC ID | 4 \* | Y | Y | N | |
+| | Ban\ | | | | | |
+| | dSector_ID | | | | | |
+| | bitwidth | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | eAxC ID | 4 \* | Y | Y | N | |
+| | CC_ID | | | | | |
+| | bitwidth | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | eAxC ID | 4 \* | Y | Y | N | |
+| | RU_Port_ID | | | | | |
+| | bitwidth | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Fra\ | Supported | Y | Y | N | |
+| | gmentation | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Transport | N/A | N | N | N | |
+| | prio\ | | | | | |
+| | ritization | | | | | |
+| | within | | | | | |
+| | U-plane | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Separation | Supported | Y | Y | N | |
+| | of | | | | | |
+| | C/U-plane | | | | | |
+| | and | | | | | |
+| | M-plane | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Separation | VLAN ID | Y | Y | N | |
+| | of C-plane | | | | | |
+| | and | | | | | |
+| | U-plane | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Max Number | 4 | Y | Y | N | |
+| | of VLAN | | | | | |
+| | per | | | | | |
+| | physical | | | | | |
+| | port | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| Reception | Rx_on_time | Supported | Y | Y | N | |
+| Window | | | | | | |
+| Monitoring | | | | | | |
+| (Counters) | | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Rx_early | Supported | N | N | N | |
++------------+------------+------------+------------+-----+-----+---+
+| | Rx_late | Supported | N | N | N | |
++------------+------------+------------+------------+-----+-----+---+
+| | Rx_corrupt | Supported | N | N | N | |
++------------+------------+------------+------------+-----+-----+---+
+| | R\ | Supported | N | N | N | |
+| | x_pkt_dupl | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Total | Supported | Y | N | N | |
+| | _msgs_rcvd | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| B\ | RU | Index and | Y | N | N | |
+| eamforming | b\ | weights | | | | |
+| | eamforming | | | | | |
+| | type | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | B\ | C-plane | Y | N | N | |
+| | eamforming | | | | | |
+| | control | | | | | |
+| | method | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Number of | No-re | Y | N | N | |
+| | beams | strictions | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| IQ | U-plane | Supported | Y | N | N | |
+| c\ | data | | | | | |
+| ompression | c\ | | | | | |
+| | ompression | | | | | |
+| | method | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | U-plane | BFP: | Y | N | N | |
+| | data IQ | 8,9,12,14 | | | | |
+| | bitwidth | bits | | | | |
+| | (Before / | | | | | |
+| | After | | | | | |
+| | co | | | | | |
+| | mpression) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Static | Supported | Y | Y | N | |
+| | con\ | | | | | |
+| | figuration | | | | | |
+| | of U-plane | | | | | |
+| | IQ format | | | | | |
+| | and | | | | | |
+| | c\ | | | | | |
+| | ompression | | | | | |
+| | header | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| eCPRI | ec\ | 001b | Y | Y | Y | |
+| Header | priVersion | | | | | |
+| Format | | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | ecp\ | Supported | Y | Y | Y | |
+| | riReserved | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | ecpriCon\ | Not | N | N | N | |
+| | catenation | supported | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | ec\ | U-plane | Supported | Y | Y | Y |
+| | priMessage | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | C-plane | Supported | Y | Y | Y |
++------------+------------+------------+------------+-----+-----+---+
+| | | Delay | Not | N | N | N |
+| | | m\ | supported | | | |
+| | | easurement | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | ec\ | Supported | Y | Y | Y | |
+| | priPayload | | | | | |
+| | (payload | | | | | |
+| | size in | | | | | |
+| | bytes) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | ecpriRtcid | Supported | Y | Y | Y | |
+| | /ecpriPcid | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | e\ | Supported | Y | Y | Y | |
+| | cpriSeqid: | | | | | |
+| | Sequence | | | | | |
+| | ID | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | e\ | Supported | Y | Y | Y | |
+| | cpriSeqid: | | | | | |
+| | E bit | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | e\ | Not | N | N | N | |
+| | cpriSeqid: | supported | | | | |
+| | S\ | | | | | |
+| | ubsequence | | | | | |
+| | ID | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| C-plane | Section | Not | N | N | N | |
+| Type | Type 0 | supported | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Section | Supported | Y | Y | Y | |
+| | Type 1 | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Section | Supported | Y | Y | N | |
+| | Type 3 | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Section | Not | N | N | N | |
+| | Type 5 | supported | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Section | Not | N | N | N | |
+| | Type 6 | supported | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Section | Not | N | N | N | |
+| | Type 7 | supported | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| C-plane | *Coding of | dat\ | Supported | Y | Y | N |
+| Packet | I\ | aDirection | | | | |
+| Format | nformation | (data | | | | |
+| | Elements – | direction | | | | |
+| | A\ | (gNB | | | | |
+| | pplication | Tx/Rx)) | | | | |
+| | Layer, | | | | | |
+| | Common* | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | payl\ | 001b | Y | Y | N |
+| | | oadVersion | | | | |
+| | | (payload | | | | |
+| | | version) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | f\ | Supported | Y | Y | N |
+| | | ilterIndex | | | | |
+| | | (filter | | | | |
+| | | index) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | frameId | Supported | Y | Y | N |
+| | | (frame | | | | |
+| | | i\ | | | | |
+| | | dentifier) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | subframeId | Supported | Y | Y | N |
+| | | (subframe | | | | |
+| | | i\ | | | | |
+| | | dentifier) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | slotId | Supported | Y | Y | N |
+| | | (slot | | | | |
+| | | i\ | | | | |
+| | | dentifier) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | sta\ | Supported | Y | Y | N |
+| | | rtSymbolid | | | | |
+| | | (start | | | | |
+| | | symbol | | | | |
+| | | i\ | | | | |
+| | | dentifier) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | number | up to the | Y | Y | N |
+| | | Ofsections | maximum | | | |
+| | | (number of | number of | | | |
+| | | sections) | PRBs | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | s\ | 1 and 3 | Y | Y | N |
+| | | ectionType | | | | |
+| | | (section | | | | |
+| | | type) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | udCompHdr | Supported | N | N | N |
+| | | (user data | | | | |
+| | | c\ | | | | |
+| | | ompression | | | | |
+| | | header) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | n\ | Not | N | N | N |
+| | | umberOfUEs | supported | | | |
+| | | (number Of | | | | |
+| | | UEs) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | timeOffset | Supported | Y | Y | N |
+| | | (time | | | | |
+| | | offset) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | fram\ | mu=0,1,3 | Y | Y | N |
+| | | eStructure | | | | |
+| | | (frame | | | | |
+| | | structure) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | cpLength | Supported | Y | Y | N |
+| | | (cyclic | | | | |
+| | | prefix | | | | |
+| | | length) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | *Coding of | sectionId | Supported | Y | Y | N |
+| | I\ | (section | | | | |
+| | nformation | i\ | | | | |
+| | Elements – | dentifier) | | | | |
+| | A\ | | | | | |
+| | pplication | | | | | |
+| | Layer, | | | | | |
+| | Sections* | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | rb | 0 | Y | Y | N |
+| | | (resource | | | | |
+| | | block | | | | |
+| | | indicator) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | symInc | 0 or 1 | Y | Y | N |
+| | | (symbol | | | | |
+| | | number | | | | |
+| | | increment | | | | |
+| | | command) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | startPrbc | Supported | Y | Y | N |
+| | | (starting | | | | |
+| | | PRB of | | | | |
+| | | control | | | | |
+| | | section) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | reMask | Supported | Y | Y | N |
+| | | (resource | | | | |
+| | | element | | | | |
+| | | mask) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | numPrbc | Supported | Y | Y | N |
+| | | (number of | | | | |
+| | | contiguous | | | | |
+| | | PRBs per | | | | |
+| | | control | | | | |
+| | | section) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | numSymbol | Supported | Y | Y | N |
+| | | (number of | | | | |
+| | | symbols) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | ef | Supported | Y | Y | N |
+| | | (extension | | | | |
+| | | flag) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | beamId | Support | Y | Y | N |
+| | | (beam | | | | |
+| | | i\ | | | | |
+| | | dentifier) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | ueId (UE | Not | N | N | N |
+| | | i\ | supported | | | |
+| | | dentifier) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | freqOffset | Supported | Y | Y | N |
+| | | (frequency | | | | |
+| | | offset) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | regulariza\| Not | N | N | N |
+| | | tionFactor | supported | | | |
+| | | (regu\ | | | | |
+| | | larization | | | | |
+| | | Factor) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | ciIsample, | Not | N | N | N |
+| | | ciQsample | supported | | | |
+| | | (channel | | | | |
+| | | i\ | | | | |
+| | | nformation | | | | |
+| | | I and Q | | | | |
+| | | values) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | laaMsgType | Not | N | N | N |
+| | | (LAA | supported | | | |
+| | | message | | | | |
+| | | type) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | laaMsgLen | Not | N | N | N |
+| | | (LAA | supported | | | |
+| | | message | | | | |
+| | | length) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | lbtHandle | Not | N | N | N |
+| | | | supported | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | lbtD\ | Not | N | N | N |
+| | | eferFactor | supported | | | |
+| | | (listen-b | | | | |
+| | | efore-talk | | | | |
+| | | defer | | | | |
+| | | factor) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | lbtBack | Not | N | N | N |
+| | | offCounter | supported | | | |
+| | | (listen-b\ | | | | |
+| | | efore-talk | | | | |
+| | | backoff | | | | |
+| | | counter) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | lbtOffset | Not | N | N | N |
+| | | (listen-b\ | supported | | | |
+| | | efore-talk | | | | |
+| | | offset) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | MCOT | Not | N | N | N |
+| | | (maximum | supported | | | |
+| | | channel | | | | |
+| | | occupancy | | | | |
+| | | time) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | lbtMode | Not | N | N | N |
+| | | (LBT Mode) | supported | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | l\ | Not | N | N | N |
+| | | btPdschRes | supported | | | |
+| | | (LBT PDSCH | | | | |
+| | | Result) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | sfStatus | Not | N | N | N |
+| | | (subframe | supported | | | |
+| | | status) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | lbtDrsRes | Not | N | N | N |
+| | | (LBT DRS | supported | | | |
+| | | Result) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | initia\ | Not | N | N | N |
+| | | lPartialSF | supported | | | |
+| | | (Initial | | | | |
+| | | partial | | | | |
+| | | SF) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | lbtBufErr | Not | N | N | N |
+| | | (LBT | supported | | | |
+| | | Buffer | | | | |
+| | | Error) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | sfnSf | Not | N | N | N |
+| | | (SFN/SF | supported | | | |
+| | | End) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | lbt | Not | N | N | N |
+| | | CWConfig_H | supported | | | |
+| | | (HARQ | | | | |
+| | | Parameters | | | | |
+| | | for | | | | |
+| | | Congestion | | | | |
+| | | Window | | | | |
+| | | m | | | | |
+| | | anagement) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | lbt | Not | N | N | N |
+| | | CWConfig_T | supported | | | |
+| | | (TB | | | | |
+| | | Parameters | | | | |
+| | | for | | | | |
+| | | Congestion | | | | |
+| | | Window | | | | |
+| | | m | | | | |
+| | | anagement) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | lbtTr\ | Not | N | N | N |
+| | | afficClass | supported | | | |
+| | | (Traffic | | | | |
+| | | class | | | | |
+| | | priority | | | | |
+| | | for | | | | |
+| | | Congestion | | | | |
+| | | Window | | | | |
+| | | m | | | | |
+| | | anagement) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | lbtCWR_Rst | Not | N | N | N |
+| | | (No | supported | | | |
+| | | tification | | | | |
+| | | about | | | | |
+| | | packet | | | | |
+| | | reception | | | | |
+| | | successful | | | | |
+| | | or not) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | reserved | 0 | N | N | N |
+| | | (reserved | | | | |
+| | | for future | | | | |
+| | | use) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | *Section | | | | |
+| | | Extension | | | | |
+| | | Commands* | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | extType | Supported | Y | N | N |
+| | | (extension | | | | |
+| | | type) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | ef | Supported | Y | N | N |
+| | | (extension | | | | |
+| | | flag) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | extLen | Supported | Y | N | N |
+| | | (extension | | | | |
+| | | length) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Coding of | | | | | |
+| | I\ | | | | | |
+| | nformation | | | | | |
+| | Elements – | | | | | |
+| | A\ | | | | | |
+| | pplication | | | | | |
+| | Layer, | | | | | |
+| | Section | | | | | |
+| | E\ | | | | | |
+| | xtensions | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | *ExtType=1:| bfwCompHdr | Supported | Y | N | N |
+| | B\ | (beam\ | | | | |
+| | eamforming | forming | | | | |
+| | Weights | weight | | | | |
+| | Extension | c\ | | | | |
+| | Type* | ompression | | | | |
+| | | header) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | bf | Supported | Y | N | N |
+| | | wCompParam | | | | |
+| | | (b\ | | | | |
+| | | eamforming | | | | |
+| | | weight | | | | |
+| | | c\ | | | | |
+| | | ompression | | | | |
+| | | parameter) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | bfwl | Supported | Y | N | N |
+| | | (b\ | | | | |
+| | | eamforming | | | | |
+| | | weight | | | | |
+| | | in-phase | | | | |
+| | | value) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | bfwQ | Supported | Y | N | N |
+| | | (b\ | | | | |
+| | | eamforming | | | | |
+| | | weight | | | | |
+| | | quadrature | | | | |
+| | | value) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | bfaCompHdr | Not | Y | N | N |
+| | *ExtType=2:| (b\ | supported | | | |
+| | B\ | eamforming | | | | |
+| | eamforming | attributes | | | | |
+| | Attributes | c\ | | | | |
+| | Extension | ompression | | | | |
+| | Type* | header) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | bfAzPt | Not | Y | N | N |
+| | | (b\ | supported | | | |
+| | | eamforming | | | | |
+| | | azimuth | | | | |
+| | | pointing | | | | |
+| | | parameter) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | bfZePt | Not | Y | N | N |
+| | | (b\ | supported | | | |
+| | | eamforming | | | | |
+| | | zenith | | | | |
+| | | pointing | | | | |
+| | | parameter) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | bfAz3dd | Not | Y | N | N |
+| | | (b | supported | | | |
+| | | eamforming | | | | |
+| | | azimuth | | | | |
+| | | beamwidth | | | | |
+| | | parameter) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | bfZe3dd | Not | Y | N | N |
+| | | (b\ | supported | | | |
+| | | eamforming | | | | |
+| | | zenith | | | | |
+| | | beamwidth | | | | |
+| | | parameter) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | bfAzSl | Not | Y | N | N |
+| | | (b\ | supported | | | |
+| | | eamforming | | | | |
+| | | azimuth | | | | |
+| | | sidelobe | | | | |
+| | | parameter) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | bfZeSl | Not | Y | N | N |
+| | | (b\ | supported | | | |
+| | | eamforming | | | | |
+| | | zenith | | | | |
+| | | sidelobe | | | | |
+| | | parameter) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | ze\ | Not | Y | N | N |
+| | | ro-padding | supported | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | cod | Not | N | N | N |
+| | *ExtType=3:| ebookIndex | supported | | | |
+| | DL | (precoder | | | | |
+| | Precoding | codebook | | | | |
+| | Extension | used for | | | | |
+| | Type* | tra | | | | |
+| | | nsmission) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | layerID | Not | N | N | N |
+| | | (Layer ID | supported | | | |
+| | | for DL | | | | |
+| | | tra\ | | | | |
+| | | nsmission) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | txScheme | Not | N | N | N |
+| | | (tr | supported | | | |
+| | | ansmission | | | | |
+| | | scheme) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | numLayers | Not | N | N | N |
+| | | (number of | supported | | | |
+| | | layers | | | | |
+| | | used for | | | | |
+| | | DL | | | | |
+| | | tra\ | | | | |
+| | | nsmission) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | crsReMask | Not | N | N | N |
+| | | (CRS | supported | | | |
+| | | resource | | | | |
+| | | element | | | | |
+| | | mask) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | c | Not | N | N | N |
+| | | rsSyumINum | supported | | | |
+| | | (CRS | | | | |
+| | | symbol | | | | |
+| | | number | | | | |
+| | | i\ | | | | |
+| | | ndication) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | crsShift | Not | N | N | N |
+| | | (crsShift | supported | | | |
+| | | used for | | | | |
+| | | DL | | | | |
+| | | tra\ | | | | |
+| | | nsmission) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | beamIdAP1 | Not | N | N | N |
+| | | (beam id | supported | | | |
+| | | to be used | | | | |
+| | | for | | | | |
+| | | antenna | | | | |
+| | | port 1) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | beamIdAP2 | Not | N | N | N |
+| | | (beam id | supported | | | |
+| | | to be used | | | | |
+| | | for | | | | |
+| | | antenna | | | | |
+| | | port 2) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | beamIdAP3 | Not | N | N | N |
+| | | (beam id | supported | | | |
+| | | to be used | | | | |
+| | | for | | | | |
+| | | antenna | | | | |
+| | | port 3) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | csf | Not | Y | N | N |
+| | *ExtType=4:| (con\ | supported | | | |
+| | Modulation | stellation | | | | |
+| | C\ | shift | | | | |
+| | ompression | flag) | | | | |
+| | Parameters | | | | | |
+| | Extension | | | | | |
+| | Type* | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | mod | Not | Y | N | N |
+| | | CompScaler | supported | | | |
+| | | ( | | | | |
+| | | modulation | | | | |
+| | | c\ | | | | |
+| | | ompression | | | | |
+| | | scaler | | | | |
+| | | value) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | mcS\ | Not | Y | N | N |
+| | *ExtType=5:| caleReMask | supported | | | |
+| | Modulation | ( | | | | |
+| | C\ | modulation | | | | |
+| | ompression | c\ | | | | |
+| | Additional | ompression | | | | |
+| | Parameters | power | | | | |
+| | Extension | scale RE | | | | |
+| | Type* | mask) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | csf | Not | Y | N | N |
+| | | (con\ | supported | | | |
+| | | stellation | | | | |
+| | | shift | | | | |
+| | | flag) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | | mcS | Not | Y | N | N |
+| | | caleOffset | supported | | | |
+| | | (scaling | | | | |
+| | | value for | | | | |
+| | | modulation | | | | |
+| | | co\ | | | | |
+| | | mpression) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| U-plane | dat | Supported | Y | Y | Y | |
+| Packet | aDirection | | | | | |
+| Format | (data | | | | | |
+| | direction | | | | | |
+| | (gNB | | | | | |
+| | Tx/Rx)) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | payl\ | 001b | Y | Y | Y | |
+| | oadVersion | | | | | |
+| | (payload | | | | | |
+| | version) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | f\ | Supported | Y | Y | Y | |
+| | ilterIndex | | | | | |
+| | (filter | | | | | |
+| | index) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | frameId | Supported | Y | Y | Y | |
+| | (frame | | | | | |
+| | i\ | | | | | |
+| | dentifier) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | subframeId | Supported | Y | Y | Y | |
+| | (subframe | | | | | |
+| | i\ | | | | | |
+| | dentifier) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | slotId | Supported | Y | Y | Y | |
+| | (slot | | | | | |
+| | i | | | | | |
+| | dentifier) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | symbolId | Supported | Y | Y | Y | |
+| | (symbol | | | | | |
+| | i\ | | | | | |
+| | dentifier) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | sectionId | Supported | Y | Y | Y | |
+| | (section | | | | | |
+| | i\ | | | | | |
+| | dentifier) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | rb | 0 | Y | Y | Y | |
+| | (resource | | | | | |
+| | block | | | | | |
+| | indicator) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | symInc | 0 | Y | Y | Y | |
+| | (symbol | | | | | |
+| | number | | | | | |
+| | increment | | | | | |
+| | command) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | startPrbu | Supported | Y | Y | Y | |
+| | (s\ | | | | | |
+| | tartingPRB | | | | | |
+| | of user | | | | | |
+| | plane | | | | | |
+| | section) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | numPrbu | Supported | Y | Y | Y | |
+| | (number of | | | | | |
+| | PRBs per | | | | | |
+| | user plane | | | | | |
+| | section) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | udCompHdr | Supported | Y | Y | N | |
+| | (user data | | | | | |
+| | c\ | | | | | |
+| | ompression | | | | | |
+| | header) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | reserved | 0 | Y | Y | Y | |
+| | (reserved | | | | | |
+| | for future | | | | | |
+| | use) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | u\ | Supported | Y | Y | N | |
+| | dCompParam | | | | | |
+| | (user data | | | | | |
+| | c\ | | | | | |
+| | ompression | | | | | |
+| | parameter) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | iSample | 16 | Y | Y | Y | |
+| | (in-phase | | | | | |
+| | sample) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | qSample | 16 | Y | Y | Y | |
+| | ( | | | | | |
+| | quadrature | | | | | |
+| | sample) | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| S-plane | Topology | Supported | N | N | N | |
+| | conf\ | | | | | |
+| | iguration: | | | | | |
+| | C1 | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Topology | Supported | N | N | N | |
+| | conf\ | | | | | |
+| | iguration: | | | | | |
+| | C2 | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Topology | Supported | Y | Y | Y | |
+| | conf\ | | | | | |
+| | iguration: | | | | | |
+| | C3 | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | Topology | Supported | N | N | N | |
+| | conf\ | | | | | |
+| | iguration: | | | | | |
+| | C4 | | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| | PTP | Full | Supported | Y | Y | N |
+| | | Timing | | | | |
+| | | Support | | | | |
+| | | (G.8275.1) | | | | |
++------------+------------+------------+------------+-----+-----+---+
+| M-plane | | | Not | N | N | N |
+| | | | supported | | | |
++------------+------------+------------+------------+-----+-----+---+
+
+\* The bit width of each component in eAxC ID can be configurable.
+
+Transport Layer
+---------------
+
+ORAN Fronthaul data can be transported over Ethernet or IPv4/IPv6. In
+the current implementation, the xRAN library supports only Ethernet with
+VLAN.
+
+.. image:: images/Native-Ethernet-Frame-with-VLAN.jpg
+ :width: 600
+ :alt: Figure 11. Native Ethernet Frame with VLAN
+
+Figure 11. Native Ethernet Frame with VLAN
+
+
+Standard DPDK routines are used to perform Transport Layer
+functionality.
+
+VLAN tag functionality is offloaded to NIC as per the configuration of
+VF (refer to Appendix Appendix 1).
+
+The transport header is defined in the ORAN Fronthaul specification
+based on the eCPRI specification.
+
+.. image:: images/eCPRI-Header-Field-Definitions.jpg
+ :width: 600
+ :alt: Figure 12. eCPRI Header Field Definitions
+
+Figure 12. eCPRI Header Field Definitions
+
+Only ECPRI_IQ_DATA = 0x00 and ECPRI_RT_CONTROL_DATA= 0x02 message types
+are supported.
+
+Handling of ecpriRtcid/ecpriPcid Bit field size is configurable and can
+be defined on the initialization stage of the xRAN |br|
+library.
+
+.. image:: images/Bit-Allocations-of-ecpriRtcid-ecpriPcid.jpg
+ :width: 600
+ :alt: Figure 13. Bit Allocations of ecpriRtcid/ecpriPcid
+
+Figure 13. Bit Allocations of ecpriRtcid/ecpriPcid
+
+For ecpriSeqid only, the support for a sequence number is implemented.
+The subsequent number is not supported.
+
+U-plane
+-------
+
+The following diagrams show xRAN packet protocols’ headers and data
+arrangement with and without compression |br|
+support.
+
+XRAN packet meant for traffic with compression enabled has the
+Compression Header added after each Application Header. According to
+ORAN Fronthaul's specification, the Compression Header is part of a
+repeated Section Application Header. In the xRAN library implementation,
+the header is implemented as a separate structure, following the
+Application Section Header. As a result, the Compression Header is not
+included in the xRAN packet, if compression is not used.
+
+Figure 14 shows the components of an xRAN packet.
+
+.. image:: images/xRAN-Packet-Components.jpg
+ :width: 600
+ :alt: Figure 14. xRAN Packet Components
+
+Figure 14. xRAN Packet Components
+
+Radio Application Header
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+The next header is a common header used for time reference.
+
+.. image:: images/Radio-Application-Header.jpg
+ :width: 600
+ :alt: Figure 15. Radio Application Header
+
+Figure 15. Radio Application Header
+
+The radio application header specific field values are implemented as
+follows:
+
+- filterIndex = 0
+
+- frameId = [0:99]
+
+- subframeId = [0:9]
+
+- slotId = [0:7]
+
+- symbolId = [0:13]
+
+Data Section Application Data Header
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The Common Radio Application Header is followed by the Application
+Header that is repeated for each Data Section |br|
+within the eCPRI message.
+The relevant section of xRAN packet is shown in color.
+
+.. image:: images/Data-Section-Application-Data-Header.jpg
+ :width: 600
+ :alt: Figure 16. Data Section Application Data Header
+
+Figure 16. Data Section Application Data Header
+
+
+A single section is used per one Ethernet packet with IQ samples
+startPrbu is equal to 0 and numPrbu is wqual to the number of RBs used:
+
+- rb field is not used (value 0).
+
+- symInc is not used (value 0)
+
+Data Payload
+~~~~~~~~~~~~
+
+An xRAN packet data payload contains a number of PRBs. Each PRB is built
+of 12 IQ samples. The supported IQ bit width is 16. udCompParam is not
+included in the data payload as compression currently is not supported.
+The data section is shown in color.
+
+.. image:: images/Data-Payload.jpg
+ :width: 600
+ :alt: Figure 17. Data Payload
+
+Figure 17. Data Payload
+
+C-plane
+-------
+
+C-Plane messages are encapsulated using a two-layered header approach.
+The first layer consists of an eCPRI standard header, including
+corresponding fields used to indicate the message type, while the second
+layer is an application layer |br|
+including necessary fields for control and
+synchronization. Within the application layer, a “section” defines the |br|
+characteristics of U-plane data to be transferred or received from a
+beam with one pattern id. In general, the transport header, |br|
+application
+header, and sections are all intended to be aligned on 4-byte boundaries
+and are transmitted in “network byte |br|
+order” meaning the most significant
+byte of a multi-byte parameter is transmitted first.
+
+Table 9 is a list of sections currently supported.
+
+Table 9. Section Types
+
++--------------+--------------------------+--------------------------+
+| Section Type | Target Scenario | Remarks |
++--------------+--------------------------+--------------------------+
+| 0 | Unused Resource Blocks | Not supported |
+| | or symbols in Downlink | |
+| | or Uplink | |
++--------------+--------------------------+--------------------------+
+| 1 | Most DL/UL radio | Supported |
+| | channels | |
++--------------+--------------------------+--------------------------+
+| 2 | reserved for future use | N/A |
++--------------+--------------------------+--------------------------+
+| 3 | PRACH and | Only PRACH is supported. |
+| | mixed-numerology | Mixed numerology is not |
+| | channels | supported. |
++--------------+--------------------------+--------------------------+
+| 4 | Reserved for future use | Not supported |
++--------------+--------------------------+--------------------------+
+| 5 | UE scheduling | Not supported |
+| | information (UE-ID | |
+| | assignment to section) | |
++--------------+--------------------------+--------------------------+
+| 6 | Channel information | Not supported |
++--------------+--------------------------+--------------------------+
+| 7 | LAA | Not supported |
++--------------+--------------------------+--------------------------+
+| 8-255 | Reserved for future use | N/A |
++--------------+--------------------------+--------------------------+
+
+Section extensions are not supported in this release.
+
+The definition of the C-Plane packet can be found lib/api/xran_pkt_cp.h
+and the fields are appropriately re-ordered in |br|
+order to apply the
+conversion of network byte order after setting values.
+
+Ethernet Header
+~~~~~~~~~~~~~~~
+
+Refer to Figure 11.
+
+eCPRI Header
+~~~~~~~~~~~~
+
+Refer to Figure 12.
+
+This header is defined as the structure of xran_ecpri_hdr in
+lib/api/xran_pkt.h.
+
+Radio Application Common Header
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The Radio Application Common Header is used for time reference. Its
+structure is shown in Figure 18.
+
+.. image:: images/Radio-Application-Common-Header.jpg
+ :width: 600
+ :alt: Figure 18. Radio Application Common Header
+
+Figure 18. Radio Application Common Header
+
+This header is defined as the structure of
+xran_cp_radioapp_common_header in lib/api/xran_pkt_cp.h.
+
+Please note that the payload version in this header is fixed to
+XRAN_PAYLOAD_VER (defined as 1) in this release.
+
+Section Type 0 Structure
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Figure 19 describes the structure of Section Type 0.
+
+.. image:: images/Section-Type-0-Structure.jpg
+ :width: 600
+ :alt: Figure 19. Section Type 0 Structure
+
+Figure 19. Section Type 0 Structure
+
+In Figure 18 through Figure 22, the color yellow means it is a transport
+header; the color pink is the radio application header; others are
+repeated sections.
+
+Section Type 1 Structure
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Figure 20 describes the structure of Section Type 1.
+
+.. image:: images/Section-Type-1-Structure.jpg
+ :width: 600
+ :alt: Figure 20. Section Type 1 Structure
+
+Figure 20. Section Type 1 Structure
+
+Section Type 1 message has two additional parameters in addition to
+radio application common header:
+
+- udCompHdr : defined as the structure of xran_radioapp_udComp_header
+
+- reserved : fixed by zero
+
+Section type 1 is defined as the structure of xran_cp_radioapp_section1,
+and this part can be repeated to have multiple sections.
+
+Whole section type 1 message can be described in this summary:
+
++----------------------------------+
+| xran_cp_radioapp_common_header |
++==================================+
+| xran_cp_radioapp_section1_header |
++----------------------------------+
+| xran_cp_radioapp_section1 |
++----------------------------------+
+| …… |
++----------------------------------+
+| xran_cp_radioapp_section1 |
++----------------------------------+
+
+Section Type 3 Structure
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Figure 21 describes the structure of Section Type 3.
+
+.. image:: images/Section-Type-3-Structure.jpg
+ :width: 600
+ :alt: Figure 21. Section Type 3 Structure
+
+Figure 21. Section Type 3 Structure
+
+Section Type 3 message has below four additional parameters in addition
+to radio application common header.
+
+- timeOffset
+
+- frameStrucutre: defined as the structure of
+ xran_cp_radioapp_frameStructure
+
+- cpLength
+
+- udCompHdr: defined as the structure of xran_radioapp_udComp_header
+
+Section Type 3 is defined as the structure of xran_cp_radioapp_section3
+and this part can be repeated to have multiple sections.
+
+Whole section type 3 message can be described in this summary:
+
++----------------------------------+
+| xran_cp_radioapp_common_header |
++==================================+
+| xran_cp_radioapp_section3_header |
++----------------------------------+
+| xran_cp_radioapp_section3 |
++----------------------------------+
+| …… |
++----------------------------------+
+| xran_cp_radioapp_section3 |
++----------------------------------+
+
+Section Type 5 Structure
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Figure 22 describes the structure of Section Type 5.
+
+.. image:: images/Section-Type-5-Structure.jpg
+ :width: 600
+ :alt: Figure 22. Section Type 5 Structure
+
+Figure 22. Section Type 5 Structure
+
+
+Section Type 6 Structure
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+Figure 23 describes the structure of Section Type 6.
+
+.. image:: images/Section-Type-6-Structure.jpg
+ :width: 600
+ :alt: Figure 23. Section Type 6 Structure
+
+Figure 23. Section Type 6 Structure
+
Code Review / o-du / phy.git / blobdiff