1 .. Copyright (c) 2019 Intel
3 .. Licensed under the Apache License, Version 2.0 (the "License");
4 .. you may not use this file except in compliance with the License.
5 .. You may obtain a copy of the License at
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10 .. distributed under the License is distributed on an "AS IS" BASIS,
11 .. WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 .. See the License for the specific language governing permissions and
13 .. limitations under the License.
19 Transport Layer and ORAN Fronthaul Protocol Implementation
20 ==========================================================
26 This chapter describes how the transport layer and ORAN Fronthaul
27 protocol are implemented.
34 Figure 8 presents an overview of the ORAN Fronthaul process.
36 .. image:: images/ORAN-Fronthaul-Process.jpg
38 :alt: Figure 8. ORAN Fronthaul Process
40 Figure 8. ORAN Fronthaul Process
42 The XRAN library provides support for transporting In-band and
43 Quadrature (IQ) samples between the O-DU and O-RU within the xRAN
44 architecture based on functional split 7.2x. The library defines the
45 xRAN packet formats to be used to transport radio samples within Front
46 Haul according to the ORAN Fronthaul specification. It provides
47 functionality for generating xRAN packets, appending IQ samples in the
48 packet payload, and extracting IQ samples from xRAN packets.
50 Note: The Bronze release version of the library supports U-plane and C-plane only. It is ready to be used in the PTP synchronized environment.
52 Note: Regarding the clock model and synchronization topology, configurations
53 C1 and C3 of the connection between O-DU and O-RU are the only
54 configurations supported in this release of the xRAN implementation.
56 Note: Quality of PTP synchronization with respect to S-plane of ORAN
57 Fronthaul requirements as defined for O-RU is out of the scope of this
58 document. PTP primary and PTP secondary configuration are expected to satisfy
59 only the O-DU side of requirements and provide the “best-effort” PTP primary for
60 O-RU. This may or may not be sufficient for achieving the end to end
61 system requirements of S-plane. Specialized dedicated NIC card with
62 additional HW functionality might be required to achieve PTP primary
63 functionality to satisfy O-RU precision requirements for RAN deployments
66 .. image:: images/Configuration-C1.jpg
68 :alt: Figure 9. Configuration C1
70 Figure 9. Configuration C1
73 .. image:: images/Configuration-C3.jpg
75 :alt: Figure 10. Configuration C3
77 Figure 10. Configuration C3
82 The ORAN Fronthaul specification defines a list of mandatory
83 functionality. Not all features defined as Mandatory for O-DU are
84 currently supported to fully extended. The following tables contain
85 information on what is available and the level of validation performed
88 Note. Cells with a red background are listed as mandatory in the
89 specification but not supported in this implementation of xRAN.
91 Table 7. ORAN Mandatory and Optional Feature Support
93 +-----------------+-----------------+-----------+----------------+
94 | Category | Feature | O-DU | Support |
96 +=================+=================+===========+================+
97 | RU Category | Support for | Mandatory | Y |
98 | | CAT-A RU (up to | | |
101 +-----------------+-----------------+-----------+----------------+
102 | | Support for | | Y |
103 | | CAT-A RU (> 8 | | |
106 +-----------------+-----------------+-----------+----------------+
107 | | Support for | Mandatory | Y |
109 | | (precoding in | | |
111 +-----------------+-----------------+-----------+----------------+
112 | Beamforming | Beam Index | Mandatory | Y |
114 +-----------------+-----------------+-----------+----------------+
115 | | Real-time BF | Mandatory | Y |
117 +-----------------+-----------------+-----------+----------------+
118 | | Real-Time | | N |
119 | | Beamforming | | |
121 +-----------------+-----------------+-----------+----------------+
122 | | UE Channel Info | | N |
123 +-----------------+-----------------+-----------+----------------+
124 | Bandwidth | Programmable | Mandatory | Y |
125 | Saving | static-bit-width| | |
126 | | Fixed Point IQ | | |
127 +-----------------+-----------------+-----------+----------------+
128 | | Real-time | | Y |
129 | | variable-bit | | |
131 +-----------------+-----------------+-----------+----------------+
132 | | Compressed IQ | | Y |
133 +-----------------+-----------------+-----------+----------------+
134 | | Block floating | | Y |
136 | | compression | | |
137 +-----------------+-----------------+-----------+----------------+
138 | | Block scaling | | N |
139 | | compression | | |
140 +-----------------+-----------------+-----------+----------------+
142 | | compression | | |
143 +-----------------+-----------------+-----------+----------------+
144 | | modulation | | N |
145 | | compression | | |
146 +-----------------+-----------------+-----------+----------------+
147 | | beamspace | | N |
148 | | compression | | |
149 +-----------------+-----------------+-----------+----------------+
150 | | Variable Bit | | Y |
152 | | Channel (per | | |
153 | | data section) | | |
154 +-----------------+-----------------+-----------+----------------+
156 | | configuration | | |
157 | | of U-Plane IQ | | |
159 | | compression | | |
161 +-----------------+-----------------+-----------+----------------+
162 | | Use of “symInc” | | N |
163 | | flag to allow | | |
165 | | symbols in a | | |
166 | | C-Plane section | | |
167 +-----------------+-----------------+-----------+----------------+
168 | Energy Saving | Transmission | | N |
170 +-----------------+-----------------+-----------+----------------+
171 | O-DU - RU | Pre-configured | Mandatory | Y |
172 | Timing | Transport Delay | | |
174 +-----------------+-----------------+-----------+----------------+
177 | | Method (eCPRI | | |
179 +-----------------+-----------------+-----------+----------------+
180 | Synchronization | G.8275.1 | Mandatory | Y (C3 only)|
182 +-----------------+-----------------+-----------+----------------+
184 +-----------------+-----------------+-----------+----------------+
185 | | GNSS based sync | | N |
186 +-----------------+-----------------+-----------+----------------+
188 +-----------------+-----------------+-----------+----------------+
189 | Transport | L2 : Ethernet | Mandatory | Y |
191 +-----------------+-----------------+-----------+----------------+
192 | | L3 : IPv4, IPv6 | | N |
193 | | (CUS Plane) | | |
194 +-----------------+-----------------+-----------+----------------+
195 | | QoS over | Mandatory | N |
197 +-----------------+-----------------+-----------+----------------+
198 | | Prioritization | | N |
199 | | of different | | |
200 | | U-plane traffic | | |
202 +-----------------+-----------------+-----------+----------------+
203 | | Support of | | N |
204 | | Jumbo Ethernet | | |
206 +-----------------+-----------------+-----------+----------------+
207 | | eCPRI | Mandatory | Y |
208 +-----------------+-----------------+-----------+----------------+
209 | | support of | | N |
211 | | concatenation | | |
212 +-----------------+-----------------+-----------+----------------+
213 | | IEEE 1914.3 | | N |
214 +-----------------+-----------------+-----------+----------------+
215 | | Application | Mandatory | Y |
216 | | fragmentation | | |
217 +-----------------+-----------------+-----------+----------------+
218 | | Transport | | N |
219 | | fragmentation | | |
220 +-----------------+-----------------+-----------+----------------+
221 | Other | LAA LBT O-DU | | N |
223 | | Window mgmt | | |
224 +-----------------+-----------------+-----------+----------------+
225 | | LAA LBT RU | | N |
227 | | Window mgmt | | |
228 +-----------------+-----------------+-----------+----------------+
230 Details on the subset of xRAN functionality implemented are shown in
233 Level of Validation Specified as:
236 - C: Completed code implementation for xRAN Library
238 - I: Integrated into Intel FlexRAN PHY
240 - T: Tested end to end with O-RU
242 Table 8. Levels of Validation
244 +------------+------------+------------+------------+-----+-----+---+
245 | Category | Item | Q4 (20.04) | | | | |
246 +============+============+============+============+=====+=====+===+
247 | | | Status | C | I | T | |
248 +------------+------------+------------+------------+-----+-----+---+
249 | General | Radio | NR | N/A | N/A | N/A | |
250 | | access | | | | | |
251 | | technology | | | | | |
252 | | (LTE / NR) | | | | | |
253 +------------+------------+------------+------------+-----+-----+---+
254 | | Nominal | 15 | Y | Y | N | |
255 | | s\ | /30/120KHz | | | | |
256 | | ub-carrier | | | | | |
257 | | spacing | | | | | |
258 +------------+------------+------------+------------+-----+-----+---+
259 | | FFT size | 512/1024 | Y | Y | N | |
260 | | | /2048/4096 | | | | |
261 +------------+------------+------------+------------+-----+-----+---+
262 | | Channel | 5/10 | Y | Y | N | |
263 | | bandwidth | /20/100Mhz | | | | |
264 +------------+------------+------------+------------+-----+-----+---+
265 | | Number of | 12 | Y | Y | N | |
267 | | channel | | | | | |
268 | | (Component | | | | | |
269 | | Carrier) | | | | | |
270 +------------+------------+------------+------------+-----+-----+---+
271 | | RU | A | Y | Y | N | |
272 | | category | | | | | |
273 +------------+------------+------------+------------+-----+-----+---+
274 | | TDD Config | Supporte\ | Y | Y | N | |
275 | | | d/Flexible | | | | |
276 +------------+------------+------------+------------+-----+-----+---+
277 | | FDD | Supported | Y | Y | N | |
278 | | Support | | | | | |
279 +------------+------------+------------+------------+-----+-----+---+
280 | | Tx/Rx | Supported | Y | Y | N | |
281 | | switching | | | | | |
282 | | based on | | | | | |
283 | | 'data | | | | | |
284 | | Direction' | | | | | |
285 | | field of | | | | | |
286 | | C-plane | | | | | |
287 | | message | | | | | |
288 +------------+------------+------------+------------+-----+-----+---+
289 | | IP version | N/A | N/A | N/A | N/A | |
291 | | Management | | | | | |
292 | | traffic at | | | | | |
293 | | fronthaul | | | | | |
294 | | network | | | | | |
295 +------------+------------+------------+------------+-----+-----+---+
296 | PRACH | One Type 3 | Supported | Y | Y | N | |
297 | | message | | | | | |
298 | | for all | | | | | |
299 | | repeated | | | | | |
300 | | PRACH | | | | | |
301 | | preambles | | | | | |
302 +------------+------------+------------+------------+-----+-----+---+
303 | | Type 3 | 1 | Y | Y | N | |
304 | | message | | | | | |
306 | | repeated | | | | | |
307 | | PRACH | | | | | |
308 | | preambles | | | | | |
309 +------------+------------+------------+------------+-----+-----+---+
310 | | timeOffset | Supported | Y | Y | N | |
311 | | including | | | | | |
312 | | cpLength | | | | | |
313 +------------+------------+------------+------------+-----+-----+---+
314 | | Supported | Supported | Y | Y | N | |
315 +------------+------------+------------+------------+-----+-----+---+
316 | | PRACH | Supported | Y | Y | N | |
317 | | preamble | | | | | |
318 | | format / | | | | | |
319 | | index | | | | | |
320 | | number | | | | | |
321 | | (number of | | | | | |
323 | | occasion) | | | | | |
324 +------------+------------+------------+------------+-----+-----+---+
325 | Delay | Network | Supported | Y | Y | N | |
326 | management | delay | | | | | |
328 | | ermination | | | | | |
329 +------------+------------+------------+------------+-----+-----+---+
330 | | lls-CU | Supported | Y | Y | N | |
331 | | timing | | | | | |
332 | | advance | | | | | |
334 +------------+------------+------------+------------+-----+-----+---+
335 | | Non-delay | Not | N | N | N | |
336 | | managed | supported | | | | |
337 | | U-plane | | | | | |
338 | | traffic | | | | | |
339 +------------+------------+------------+------------+-----+-----+---+
340 | C/U-plane | Transport | Ethernet | Y | Y | N | |
341 | Transport | enc\ | | | | | |
342 | | apsulation | | | | | |
343 | | (Ethernet | | | | | |
344 | | / IP) | | | | | |
345 +------------+------------+------------+------------+-----+-----+---+
346 | | Jumbo | Supported | Y | Y | N | |
347 | | frames | | | | | |
348 +------------+------------+------------+------------+-----+-----+---+
349 | | Transport | eCPRI | Y | Y | N | |
350 | | header | | | | | |
351 | | (eCPRI / | | | | | |
353 +------------+------------+------------+------------+-----+-----+---+
354 | | IP version | N/A | N/A | N/A | N/A | |
356 | | Transport | | | | | |
357 | | header is | | | | | |
358 | | IP/UDP | | | | | |
359 +------------+------------+------------+------------+-----+-----+---+
360 | | eCPRI | Not | N | N | N | |
361 | | Con\ | supported | | | | |
362 | | catenation | | | | | |
364 | | Transport | | | | | |
365 | | header is | | | | | |
366 | | eCPRI | | | | | |
367 +------------+------------+------------+------------+-----+-----+---+
368 | | eAxC ID | 4 \* | Y | Y | N | |
369 | | CU_Port_ID | | | | | |
370 | | bitwidth | | | | | |
371 +------------+------------+------------+------------+-----+-----+---+
372 | | eAxC ID | 4 \* | Y | Y | N | |
374 | | dSector_ID | | | | | |
375 | | bitwidth | | | | | |
376 +------------+------------+------------+------------+-----+-----+---+
377 | | eAxC ID | 4 \* | Y | Y | N | |
378 | | CC_ID | | | | | |
379 | | bitwidth | | | | | |
380 +------------+------------+------------+------------+-----+-----+---+
381 | | eAxC ID | 4 \* | Y | Y | N | |
382 | | RU_Port_ID | | | | | |
383 | | bitwidth | | | | | |
384 +------------+------------+------------+------------+-----+-----+---+
385 | | Fra\ | Supported | Y | Y | N | |
386 | | gmentation | | | | | |
387 +------------+------------+------------+------------+-----+-----+---+
388 | | Transport | N/A | N | N | N | |
389 | | prio\ | | | | | |
390 | | ritization | | | | | |
391 | | within | | | | | |
392 | | U-plane | | | | | |
393 +------------+------------+------------+------------+-----+-----+---+
394 | | Separation | Supported | Y | Y | N | |
396 | | C/U-plane | | | | | |
398 | | M-plane | | | | | |
399 +------------+------------+------------+------------+-----+-----+---+
400 | | Separation | VLAN ID | Y | Y | N | |
401 | | of C-plane | | | | | |
403 | | U-plane | | | | | |
404 +------------+------------+------------+------------+-----+-----+---+
405 | | Max Number | 16 | Y | Y | N | |
406 | | of VLAN | | | | | |
408 | | physical | | | | | |
410 +------------+------------+------------+------------+-----+-----+---+
411 | Reception | Rx_on_time | Supported | Y | Y | N | |
412 | Window | | | | | | |
413 | Monitoring | | | | | | |
414 | (Counters) | | | | | | |
415 +------------+------------+------------+------------+-----+-----+---+
416 | | Rx_early | Supported | N | N | N | |
417 +------------+------------+------------+------------+-----+-----+---+
418 | | Rx_late | Supported | N | N | N | |
419 +------------+------------+------------+------------+-----+-----+---+
420 | | Rx_corrupt | Supported | N | N | N | |
421 +------------+------------+------------+------------+-----+-----+---+
422 | | R\ | Supported | N | N | N | |
423 | | x_pkt_dupl | | | | | |
424 +------------+------------+------------+------------+-----+-----+---+
425 | | Total | Supported | Y | N | N | |
426 | | _msgs_rcvd | | | | | |
427 +------------+------------+------------+------------+-----+-----+---+
428 | B\ | RU | Index and | Y | Y | N | |
429 | eamforming | b\ | weights | | | | |
430 | | eamforming | | | | | |
432 +------------+------------+------------+------------+-----+-----+---+
433 | | B\ | C-plane | Y | N | N | |
434 | | eamforming | | | | | |
435 | | control | | | | | |
436 | | method | | | | | |
437 +------------+------------+------------+------------+-----+-----+---+
438 | | Number of | No-re | Y | Y | N | |
439 | | beams | strictions | | | | |
440 +------------+------------+------------+------------+-----+-----+---+
441 | IQ | U-plane | Supported | Y | Y | Y | |
442 | c\ | data | | | | | |
443 | ompression | c\ | | | | | |
444 | | ompression | | | | | |
445 | | method | | | | | |
446 +------------+------------+------------+------------+-----+-----+---+
447 | | U-plane | BFP: | Y | Y | Y | |
448 | | data IQ | 8,9,12,14 | | | | |
449 | | bitwidth | bits | | | | |
450 | | (Before / | | | | | |
451 | | After | | | | | |
453 | | mpression) | | | | | |
454 +------------+------------+------------+------------+-----+-----+---+
455 | | Static | Supported | N | N | N | |
457 | | figuration | | | | | |
458 | | of U-plane | | | | | |
459 | | IQ format | | | | | |
462 | | ompression | | | | | |
463 | | header | | | | | |
464 +------------+------------+------------+------------+-----+-----+---+
465 | eCPRI | ec\ | 001b | Y | Y | Y | |
466 | Header | priVersion | | | | | |
467 | Format | | | | | | |
468 +------------+------------+------------+------------+-----+-----+---+
469 | | ecp\ | Supported | Y | Y | Y | |
470 | | riReserved | | | | | |
471 +------------+------------+------------+------------+-----+-----+---+
472 | | ecpriCon\ | Not | N | N | N | |
473 | | catenation | supported | | | | |
474 +------------+------------+------------+------------+-----+-----+---+
475 | | ec\ | U-plane | Supported | Y | Y | Y |
476 | | priMessage | | | | | |
477 +------------+------------+------------+------------+-----+-----+---+
478 | | | C-plane | Supported | Y | Y | Y |
479 +------------+------------+------------+------------+-----+-----+---+
480 | | | Delay | Not | N | N | N |
481 | | | m\ | supported | | | |
482 | | | easurement | | | | |
483 +------------+------------+------------+------------+-----+-----+---+
484 | | ec\ | Supported | Y | Y | Y | |
485 | | priPayload | | | | | |
486 | | (payload | | | | | |
487 | | size in | | | | | |
488 | | bytes) | | | | | |
489 +------------+------------+------------+------------+-----+-----+---+
490 | | ecpriRtcid | Supported | Y | Y | Y | |
491 | | /ecpriPcid | | | | | |
492 +------------+------------+------------+------------+-----+-----+---+
493 | | e\ | Supported | Y | Y | Y | |
494 | | cpriSeqid: | | | | | |
495 | | Sequence | | | | | |
497 +------------+------------+------------+------------+-----+-----+---+
498 | | e\ | Supported | Y | Y | Y | |
499 | | cpriSeqid: | | | | | |
500 | | E bit | | | | | |
501 +------------+------------+------------+------------+-----+-----+---+
502 | | e\ | Not | N | N | N | |
503 | | cpriSeqid: | supported | | | | |
505 | | ubsequence | | | | | |
507 +------------+------------+------------+------------+-----+-----+---+
508 | C-plane | Section | Not | N | N | N | |
509 | Type | Type 0 | supported | | | | |
510 +------------+------------+------------+------------+-----+-----+---+
511 | | Section | Supported | Y | Y | Y | |
512 | | Type 1 | | | | | |
513 +------------+------------+------------+------------+-----+-----+---+
514 | | Section | Supported | Y | Y | Y | |
515 | | Type 3 | | | | | |
516 +------------+------------+------------+------------+-----+-----+---+
517 | | Section | Not | N | N | N | |
518 | | Type 5 | supported | | | | |
519 +------------+------------+------------+------------+-----+-----+---+
520 | | Section | Not | N | N | N | |
521 | | Type 6 | supported | | | | |
522 +------------+------------+------------+------------+-----+-----+---+
523 | | Section | Not | N | N | N | |
524 | | Type 7 | supported | | | | |
525 +------------+------------+------------+------------+-----+-----+---+
526 | C-plane | *Coding of | dat\ | Supported | Y | Y | N |
527 | Packet | I\ | aDirection | | | | |
528 | Format | nformation | (data | | | | |
529 | | Elements – | direction | | | | |
530 | | A\ | (gNB | | | | |
531 | | pplication | Tx/Rx)) | | | | |
532 | | Layer, | | | | | |
533 | | Common* | | | | | |
534 +------------+------------+------------+------------+-----+-----+---+
535 | | | payl\ | 001b | Y | Y | N |
536 | | | oadVersion | | | | |
537 | | | (payload | | | | |
538 | | | version) | | | | |
539 +------------+------------+------------+------------+-----+-----+---+
540 | | | f\ | Supported | Y | Y | N |
541 | | | ilterIndex | | | | |
542 | | | (filter | | | | |
543 | | | index) | | | | |
544 +------------+------------+------------+------------+-----+-----+---+
545 | | | frameId | Supported | Y | Y | N |
546 | | | (frame | | | | |
548 | | | dentifier) | | | | |
549 +------------+------------+------------+------------+-----+-----+---+
550 | | | subframeId | Supported | Y | Y | N |
551 | | | (subframe | | | | |
553 | | | dentifier) | | | | |
554 +------------+------------+------------+------------+-----+-----+---+
555 | | | slotId | Supported | Y | Y | N |
556 | | | (slot | | | | |
558 | | | dentifier) | | | | |
559 +------------+------------+------------+------------+-----+-----+---+
560 | | | sta\ | Supported | Y | Y | N |
561 | | | rtSymbolid | | | | |
562 | | | (start | | | | |
563 | | | symbol | | | | |
565 | | | dentifier) | | | | |
566 +------------+------------+------------+------------+-----+-----+---+
567 | | | number | up to the | Y | Y | N |
568 | | | Ofsections | maximum | | | |
569 | | | (number of | number of | | | |
570 | | | sections) | PRBs | | | |
571 +------------+------------+------------+------------+-----+-----+---+
572 | | | s\ | 1 and 3 | Y | Y | N |
573 | | | ectionType | | | | |
574 | | | (section | | | | |
575 | | | type) | | | | |
576 +------------+------------+------------+------------+-----+-----+---+
577 | | | udCompHdr | Supported | Y | Y | N |
578 | | | (user data | | | | |
580 | | | ompression | | | | |
581 | | | header) | | | | |
582 +------------+------------+------------+------------+-----+-----+---+
583 | | | n\ | Not | N | N | N |
584 | | | umberOfUEs | supported | | | |
585 | | | (number Of | | | | |
587 +------------+------------+------------+------------+-----+-----+---+
588 | | | timeOffset | Supported | Y | Y | N |
589 | | | (time | | | | |
590 | | | offset) | | | | |
591 +------------+------------+------------+------------+-----+-----+---+
592 | | | fram\ | mu=0,1,3 | Y | Y | N |
593 | | | eStructure | | | | |
594 | | | (frame | | | | |
595 | | | structure) | | | | |
596 +------------+------------+------------+------------+-----+-----+---+
597 | | | cpLength | Supported | Y | Y | N |
598 | | | (cyclic | | | | |
599 | | | prefix | | | | |
600 | | | length) | | | | |
601 +------------+------------+------------+------------+-----+-----+---+
602 | | *Coding of | sectionId | Supported | Y | Y | N |
603 | | I\ | (section | | | | |
604 | | nformation | i\ | | | | |
605 | | Elements – | dentifier) | | | | |
607 | | pplication | | | | | |
608 | | Layer, | | | | | |
609 | | Sections* | | | | | |
610 +------------+------------+------------+------------+-----+-----+---+
611 | | | rb | 0 | Y | Y | N |
612 | | | (resource | | | | |
613 | | | block | | | | |
614 | | | indicator) | | | | |
615 +------------+------------+------------+------------+-----+-----+---+
616 | | | symInc | 0 or 1 | Y | Y | N |
617 | | | (symbol | | | | |
618 | | | number | | | | |
619 | | | increment | | | | |
620 | | | command) | | | | |
621 +------------+------------+------------+------------+-----+-----+---+
622 | | | startPrbc | Supported | Y | Y | N |
623 | | | (starting | | | | |
624 | | | PRB of | | | | |
625 | | | control | | | | |
626 | | | section) | | | | |
627 +------------+------------+------------+------------+-----+-----+---+
628 | | | reMask | Supported | Y | Y | N |
629 | | | (resource | | | | |
630 | | | element | | | | |
631 | | | mask) | | | | |
632 +------------+------------+------------+------------+-----+-----+---+
633 | | | numPrbc | Supported | Y | Y | N |
634 | | | (number of | | | | |
635 | | | contiguous | | | | |
636 | | | PRBs per | | | | |
637 | | | control | | | | |
638 | | | section) | | | | |
639 +------------+------------+------------+------------+-----+-----+---+
640 | | | numSymbol | Supported | Y | Y | N |
641 | | | (number of | | | | |
642 | | | symbols) | | | | |
643 +------------+------------+------------+------------+-----+-----+---+
644 | | | ef | Supported | Y | Y | N |
645 | | | (extension | | | | |
646 | | | flag) | | | | |
647 +------------+------------+------------+------------+-----+-----+---+
648 | | | beamId | Support | Y | Y | N |
649 | | | (beam | | | | |
651 | | | dentifier) | | | | |
652 +------------+------------+------------+------------+-----+-----+---+
653 | | | ueId (UE | Not | N | N | N |
654 | | | i\ | supported | | | |
655 | | | dentifier) | | | | |
656 +------------+------------+------------+------------+-----+-----+---+
657 | | | freqOffset | Supported | Y | Y | N |
658 | | | (frequency | | | | |
659 | | | offset) | | | | |
660 +------------+------------+------------+------------+-----+-----+---+
661 | | | regulariza\| Not | N | N | N |
662 | | | tionFactor | supported | | | |
663 | | | (regu\ | | | | |
664 | | | larization | | | | |
665 | | | Factor) | | | | |
666 +------------+------------+------------+------------+-----+-----+---+
667 | | | ciIsample, | Not | N | N | N |
668 | | | ciQsample | supported | | | |
669 | | | (channel | | | | |
671 | | | nformation | | | | |
672 | | | I and Q | | | | |
673 | | | values) | | | | |
674 +------------+------------+------------+------------+-----+-----+---+
675 | | | laaMsgType | Not | N | N | N |
676 | | | (LAA | supported | | | |
677 | | | message | | | | |
678 | | | type) | | | | |
679 +------------+------------+------------+------------+-----+-----+---+
680 | | | laaMsgLen | Not | N | N | N |
681 | | | (LAA | supported | | | |
682 | | | message | | | | |
683 | | | length) | | | | |
684 +------------+------------+------------+------------+-----+-----+---+
685 | | | lbtHandle | Not | N | N | N |
686 | | | | supported | | | |
687 +------------+------------+------------+------------+-----+-----+---+
688 | | | lbtD\ | Not | N | N | N |
689 | | | eferFactor | supported | | | |
690 | | | (listen-b | | | | |
691 | | | efore-talk | | | | |
692 | | | defer | | | | |
693 | | | factor) | | | | |
694 +------------+------------+------------+------------+-----+-----+---+
695 | | | lbtBack | Not | N | N | N |
696 | | | offCounter | supported | | | |
697 | | | (listen-b\ | | | | |
698 | | | efore-talk | | | | |
699 | | | backoff | | | | |
700 | | | counter) | | | | |
701 +------------+------------+------------+------------+-----+-----+---+
702 | | | lbtOffset | Not | N | N | N |
703 | | | (listen-b\ | supported | | | |
704 | | | efore-talk | | | | |
705 | | | offset) | | | | |
706 +------------+------------+------------+------------+-----+-----+---+
707 | | | MCOT | Not | N | N | N |
708 | | | (maximum | supported | | | |
709 | | | channel | | | | |
710 | | | occupancy | | | | |
711 | | | time) | | | | |
712 +------------+------------+------------+------------+-----+-----+---+
713 | | | lbtMode | Not | N | N | N |
714 | | | (LBT Mode) | supported | | | |
715 +------------+------------+------------+------------+-----+-----+---+
716 | | | l\ | Not | N | N | N |
717 | | | btPdschRes | supported | | | |
718 | | | (LBT PDSCH | | | | |
719 | | | Result) | | | | |
720 +------------+------------+------------+------------+-----+-----+---+
721 | | | sfStatus | Not | N | N | N |
722 | | | (subframe | supported | | | |
723 | | | status) | | | | |
724 +------------+------------+------------+------------+-----+-----+---+
725 | | | lbtDrsRes | Not | N | N | N |
726 | | | (LBT DRS | supported | | | |
727 | | | Result) | | | | |
728 +------------+------------+------------+------------+-----+-----+---+
729 | | | initia\ | Not | N | N | N |
730 | | | lPartialSF | supported | | | |
731 | | | (Initial | | | | |
732 | | | partial | | | | |
734 +------------+------------+------------+------------+-----+-----+---+
735 | | | lbtBufErr | Not | N | N | N |
736 | | | (LBT | supported | | | |
737 | | | Buffer | | | | |
738 | | | Error) | | | | |
739 +------------+------------+------------+------------+-----+-----+---+
740 | | | sfnSf | Not | N | N | N |
741 | | | (SFN/SF | supported | | | |
743 +------------+------------+------------+------------+-----+-----+---+
744 | | | lbt | Not | N | N | N |
745 | | | CWConfig_H | supported | | | |
746 | | | (HARQ | | | | |
747 | | | Parameters | | | | |
749 | | | Congestion | | | | |
750 | | | Window | | | | |
752 | | | anagement) | | | | |
753 +------------+------------+------------+------------+-----+-----+---+
754 | | | lbt | Not | N | N | N |
755 | | | CWConfig_T | supported | | | |
757 | | | Parameters | | | | |
759 | | | Congestion | | | | |
760 | | | Window | | | | |
762 | | | anagement) | | | | |
763 +------------+------------+------------+------------+-----+-----+---+
764 | | | lbtTr\ | Not | N | N | N |
765 | | | afficClass | supported | | | |
766 | | | (Traffic | | | | |
767 | | | class | | | | |
768 | | | priority | | | | |
770 | | | Congestion | | | | |
771 | | | Window | | | | |
773 | | | anagement) | | | | |
774 +------------+------------+------------+------------+-----+-----+---+
775 | | | lbtCWR_Rst | Not | N | N | N |
776 | | | (No | supported | | | |
777 | | | tification | | | | |
778 | | | about | | | | |
779 | | | packet | | | | |
780 | | | reception | | | | |
781 | | | successful | | | | |
782 | | | or not) | | | | |
783 +------------+------------+------------+------------+-----+-----+---+
784 | | | reserved | 0 | N | N | N |
785 | | | (reserved | | | | |
786 | | | for future | | | | |
788 +------------+------------+------------+------------+-----+-----+---+
789 | | | *Section | | | | |
790 | | | Extension | | | | |
791 | | | Commands* | | | | |
792 +------------+------------+------------+------------+-----+-----+---+
793 | | | extType | Supported | Y | Y | N |
794 | | | (extension | | | | |
795 | | | type) | | | | |
796 +------------+------------+------------+------------+-----+-----+---+
797 | | | ef | Supported | Y | Y | N |
798 | | | (extension | | | | |
799 | | | flag) | | | | |
800 +------------+------------+------------+------------+-----+-----+---+
801 | | | extLen | Supported | Y | Y | N |
802 | | | (extension | | | | |
803 | | | length) | | | | |
804 +------------+------------+------------+------------+-----+-----+---+
805 | | Coding of | | | | | |
807 | | nformation | | | | | |
808 | | Elements – | | | | | |
810 | | pplication | | | | | |
811 | | Layer, | | | | | |
812 | | Section | | | | | |
814 | | xtensions | | | | | |
815 +------------+------------+------------+------------+-----+-----+---+
816 | | *ExtType=1:| bfwCompHdr | Supported | Y | Y | N |
817 | | B\ | (beam\ | | | | |
818 | | eamforming | forming | | | | |
819 | | Weights | weight | | | | |
820 | | Extension | c\ | | | | |
821 | | Type* | ompression | | | | |
822 | | | header) | | | | |
823 +------------+------------+------------+------------+-----+-----+---+
824 | | | bf | Supported | Y | Y | N |
825 | | | wCompParam | | | | |
827 | | | eamforming | | | | |
828 | | | weight | | | | |
830 | | | ompression | | | | |
831 | | | parameter) | | | | |
832 +------------+------------+------------+------------+-----+-----+---+
833 | | | bfwl | Supported | Y | Y | N |
835 | | | eamforming | | | | |
836 | | | weight | | | | |
837 | | | in-phase | | | | |
838 | | | value) | | | | |
839 +------------+------------+------------+------------+-----+-----+---+
840 | | | bfwQ | Supported | Y | Y | N |
842 | | | eamforming | | | | |
843 | | | weight | | | | |
844 | | | quadrature | | | | |
845 | | | value) | | | | |
846 +------------+------------+------------+------------+-----+-----+---+
847 | | | bfaCompHdr | Not | Y | N | N |
848 | | *ExtType=2:| (b\ | supported | | | |
849 | | B\ | eamforming | | | | |
850 | | eamforming | attributes | | | | |
851 | | Attributes | c\ | | | | |
852 | | Extension | ompression | | | | |
853 | | Type* | header) | | | | |
854 +------------+------------+------------+------------+-----+-----+---+
855 | | | bfAzPt | Not | Y | N | N |
856 | | | (b\ | supported | | | |
857 | | | eamforming | | | | |
858 | | | azimuth | | | | |
859 | | | pointing | | | | |
860 | | | parameter) | | | | |
861 +------------+------------+------------+------------+-----+-----+---+
862 | | | bfZePt | Not | Y | N | N |
863 | | | (b\ | supported | | | |
864 | | | eamforming | | | | |
865 | | | zenith | | | | |
866 | | | pointing | | | | |
867 | | | parameter) | | | | |
868 +------------+------------+------------+------------+-----+-----+---+
869 | | | bfAz3dd | Not | Y | N | N |
870 | | | (b | supported | | | |
871 | | | eamforming | | | | |
872 | | | azimuth | | | | |
873 | | | beamwidth | | | | |
874 | | | parameter) | | | | |
875 +------------+------------+------------+------------+-----+-----+---+
876 | | | bfZe3dd | Not | Y | N | N |
877 | | | (b\ | supported | | | |
878 | | | eamforming | | | | |
879 | | | zenith | | | | |
880 | | | beamwidth | | | | |
881 | | | parameter) | | | | |
882 +------------+------------+------------+------------+-----+-----+---+
883 | | | bfAzSl | Not | Y | N | N |
884 | | | (b\ | supported | | | |
885 | | | eamforming | | | | |
886 | | | azimuth | | | | |
887 | | | sidelobe | | | | |
888 | | | parameter) | | | | |
889 +------------+------------+------------+------------+-----+-----+---+
890 | | | bfZeSl | Not | Y | N | N |
891 | | | (b\ | supported | | | |
892 | | | eamforming | | | | |
893 | | | zenith | | | | |
894 | | | sidelobe | | | | |
895 | | | parameter) | | | | |
896 +------------+------------+------------+------------+-----+-----+---+
897 | | | ze\ | Not | Y | N | N |
898 | | | ro-padding | supported | | | |
899 +------------+------------+------------+------------+-----+-----+---+
900 | | | cod | Not | N | N | N |
901 | | *ExtType=3:| ebookIndex | supported | | | |
902 | | DL | (precoder | | | | |
903 | | Precoding | codebook | | | | |
904 | | Extension | used for | | | | |
905 | | Type* | tra | | | | |
906 | | | nsmission) | | | | |
907 +------------+------------+------------+------------+-----+-----+---+
908 | | | layerID | Not | N | N | N |
909 | | | (Layer ID | supported | | | |
910 | | | for DL | | | | |
912 | | | nsmission) | | | | |
913 +------------+------------+------------+------------+-----+-----+---+
914 | | | txScheme | Not | N | N | N |
915 | | | (tr | supported | | | |
916 | | | ansmission | | | | |
917 | | | scheme) | | | | |
918 +------------+------------+------------+------------+-----+-----+---+
919 | | | numLayers | Not | N | N | N |
920 | | | (number of | supported | | | |
921 | | | layers | | | | |
922 | | | used for | | | | |
925 | | | nsmission) | | | | |
926 +------------+------------+------------+------------+-----+-----+---+
927 | | | crsReMask | Not | N | N | N |
928 | | | (CRS | supported | | | |
929 | | | resource | | | | |
930 | | | element | | | | |
931 | | | mask) | | | | |
932 +------------+------------+------------+------------+-----+-----+---+
933 | | | c | Not | N | N | N |
934 | | | rsSyumINum | supported | | | |
936 | | | symbol | | | | |
937 | | | number | | | | |
939 | | | ndication) | | | | |
940 +------------+------------+------------+------------+-----+-----+---+
941 | | | crsShift | Not | N | N | N |
942 | | | (crsShift | supported | | | |
943 | | | used for | | | | |
946 | | | nsmission) | | | | |
947 +------------+------------+------------+------------+-----+-----+---+
948 | | | beamIdAP1 | Not | N | N | N |
949 | | | (beam id | supported | | | |
950 | | | to be used | | | | |
952 | | | antenna | | | | |
953 | | | port 1) | | | | |
954 +------------+------------+------------+------------+-----+-----+---+
955 | | | beamIdAP2 | Not | N | N | N |
956 | | | (beam id | supported | | | |
957 | | | to be used | | | | |
959 | | | antenna | | | | |
960 | | | port 2) | | | | |
961 +------------+------------+------------+------------+-----+-----+---+
962 | | | beamIdAP3 | Not | N | N | N |
963 | | | (beam id | supported | | | |
964 | | | to be used | | | | |
966 | | | antenna | | | | |
967 | | | port 3) | | | | |
968 +------------+------------+------------+------------+-----+-----+---+
969 | | | csf | Not | Y | N | N |
970 | | *ExtType=4:| (con\ | supported | | | |
971 | | Modulation | stellation | | | | |
972 | | C\ | shift | | | | |
973 | | ompression | flag) | | | | |
974 | | Parameters | | | | | |
975 | | Extension | | | | | |
976 | | Type* | | | | | |
977 +------------+------------+------------+------------+-----+-----+---+
978 | | | mod | Not | Y | N | N |
979 | | | CompScaler | supported | | | |
981 | | | modulation | | | | |
983 | | | ompression | | | | |
984 | | | scaler | | | | |
985 | | | value) | | | | |
986 +------------+------------+------------+------------+-----+-----+---+
987 | | | mcS\ | Not | Y | N | N |
988 | | *ExtType=5:| caleReMask | supported | | | |
989 | | Modulation | ( | | | | |
990 | | C\ | modulation | | | | |
991 | | ompression | c\ | | | | |
992 | | Additional | ompression | | | | |
993 | | Parameters | power | | | | |
994 | | Extension | scale RE | | | | |
995 | | Type* | mask) | | | | |
996 +------------+------------+------------+------------+-----+-----+---+
997 | | | csf | Not | Y | N | N |
998 | | | (con\ | supported | | | |
999 | | | stellation | | | | |
1000 | | | shift | | | | |
1001 | | | flag) | | | | |
1002 +------------+------------+------------+------------+-----+-----+---+
1003 | | | mcS | Not | Y | N | N |
1004 | | | caleOffset | supported | | | |
1005 | | | (scaling | | | | |
1006 | | | value for | | | | |
1007 | | | modulation | | | | |
1009 | | | mpression) | | | | |
1010 +------------+------------+------------+------------+-----+-----+---+
1011 | U-plane | dat | Supported | Y | Y | Y | |
1012 | Packet | aDirection | | | | | |
1013 | Format | (data | | | | | |
1014 | | direction | | | | | |
1015 | | (gNB | | | | | |
1016 | | Tx/Rx)) | | | | | |
1017 +------------+------------+------------+------------+-----+-----+---+
1018 | | payl\ | 001b | Y | Y | Y | |
1019 | | oadVersion | | | | | |
1020 | | (payload | | | | | |
1021 | | version) | | | | | |
1022 +------------+------------+------------+------------+-----+-----+---+
1023 | | f\ | Supported | Y | Y | Y | |
1024 | | ilterIndex | | | | | |
1025 | | (filter | | | | | |
1026 | | index) | | | | | |
1027 +------------+------------+------------+------------+-----+-----+---+
1028 | | frameId | Supported | Y | Y | Y | |
1029 | | (frame | | | | | |
1031 | | dentifier) | | | | | |
1032 +------------+------------+------------+------------+-----+-----+---+
1033 | | subframeId | Supported | Y | Y | Y | |
1034 | | (subframe | | | | | |
1036 | | dentifier) | | | | | |
1037 +------------+------------+------------+------------+-----+-----+---+
1038 | | slotId | Supported | Y | Y | Y | |
1039 | | (slot | | | | | |
1041 | | dentifier) | | | | | |
1042 +------------+------------+------------+------------+-----+-----+---+
1043 | | symbolId | Supported | Y | Y | Y | |
1044 | | (symbol | | | | | |
1046 | | dentifier) | | | | | |
1047 +------------+------------+------------+------------+-----+-----+---+
1048 | | sectionId | Supported | Y | Y | Y | |
1049 | | (section | | | | | |
1051 | | dentifier) | | | | | |
1052 +------------+------------+------------+------------+-----+-----+---+
1053 | | rb | 0 | Y | Y | Y | |
1054 | | (resource | | | | | |
1055 | | block | | | | | |
1056 | | indicator) | | | | | |
1057 +------------+------------+------------+------------+-----+-----+---+
1058 | | symInc | 0 | Y | Y | Y | |
1059 | | (symbol | | | | | |
1060 | | number | | | | | |
1061 | | increment | | | | | |
1062 | | command) | | | | | |
1063 +------------+------------+------------+------------+-----+-----+---+
1064 | | startPrbu | Supported | Y | Y | Y | |
1066 | | tartingPRB | | | | | |
1067 | | of user | | | | | |
1068 | | plane | | | | | |
1069 | | section) | | | | | |
1070 +------------+------------+------------+------------+-----+-----+---+
1071 | | numPrbu | Supported | Y | Y | Y | |
1072 | | (number of | | | | | |
1073 | | PRBs per | | | | | |
1074 | | user plane | | | | | |
1075 | | section) | | | | | |
1076 +------------+------------+------------+------------+-----+-----+---+
1077 | | udCompHdr | Supported | Y | Y | N | |
1078 | | (user data | | | | | |
1080 | | ompression | | | | | |
1081 | | header) | | | | | |
1082 +------------+------------+------------+------------+-----+-----+---+
1083 | | reserved | 0 | Y | Y | Y | |
1084 | | (reserved | | | | | |
1085 | | for future | | | | | |
1086 | | use) | | | | | |
1087 +------------+------------+------------+------------+-----+-----+---+
1088 | | u\ | Supported | Y | Y | N | |
1089 | | dCompParam | | | | | |
1090 | | (user data | | | | | |
1092 | | ompression | | | | | |
1093 | | parameter) | | | | | |
1094 +------------+------------+------------+------------+-----+-----+---+
1095 | | iSample | 16 | Y | Y | Y | |
1096 | | (in-phase | | | | | |
1097 | | sample) | | | | | |
1098 +------------+------------+------------+------------+-----+-----+---+
1099 | | qSample | 16 | Y | Y | Y | |
1101 | | quadrature | | | | | |
1102 | | sample) | | | | | |
1103 +------------+------------+------------+------------+-----+-----+---+
1104 | S-plane | Topology | Supported | N | N | N | |
1105 | | conf\ | | | | | |
1106 | | iguration: | | | | | |
1108 +------------+------------+------------+------------+-----+-----+---+
1109 | | Topology | Supported | N | N | N | |
1110 | | conf\ | | | | | |
1111 | | iguration: | | | | | |
1113 +------------+------------+------------+------------+-----+-----+---+
1114 | | Topology | Supported | Y | Y | Y | |
1115 | | conf\ | | | | | |
1116 | | iguration: | | | | | |
1118 +------------+------------+------------+------------+-----+-----+---+
1119 | | Topology | Supported | N | N | N | |
1120 | | conf\ | | | | | |
1121 | | iguration: | | | | | |
1123 +------------+------------+------------+------------+-----+-----+---+
1124 | | PTP | Full | Supported | Y | Y | N |
1125 | | | Timing | | | | |
1126 | | | Support | | | | |
1127 | | | (G.8275.1) | | | | |
1128 +------------+------------+------------+------------+-----+-----+---+
1129 | M-plane | | | Not | N | N | N |
1130 | | | | supported | | | |
1131 +------------+------------+------------+------------+-----+-----+---+
1133 \* The bit width of each component in eAxC ID can be configurable.
1138 ORAN Fronthaul data can be transported over Ethernet or IPv4/IPv6. In
1139 the current implementation, the xRAN library supports only Ethernet with
1142 .. image:: images/Native-Ethernet-Frame-with-VLAN.jpg
1144 :alt: Figure 11. Native Ethernet Frame with VLAN
1146 Figure 11. Native Ethernet Frame with VLAN
1149 Standard DPDK routines are used to perform Transport Layer
1152 VLAN tag functionality is offloaded to NIC as per the configuration of
1153 VF (refer to Appendix Appendix 1).
1155 The transport header is defined in the ORAN Fronthaul specification
1156 based on the eCPRI specification.
1158 .. image:: images/eCPRI-Header-Field-Definitions.jpg
1160 :alt: Figure 12. eCPRI Header Field Definitions
1162 Figure 12. eCPRI Header Field Definitions
1164 Only ECPRI_IQ_DATA = 0x00 and ECPRI_RT_CONTROL_DATA= 0x02 message types
1167 Handling of ecpriRtcid/ecpriPcid Bit field size is configurable and can
1168 be defined on the initialization stage of the xRAN library.
1170 .. image:: images/Bit-Allocations-of-ecpriRtcid-ecpriPcid.jpg
1172 :alt: Figure 13. Bit Allocations of ecpriRtcid/ecpriPcid
1174 Figure 13. Bit Allocations of ecpriRtcid/ecpriPcid
1176 For ecpriSeqid only, the support for a sequence number is implemented.
1177 The subsequent number is not supported.
1182 The following diagrams show xRAN packet protocols’ headers and data
1183 arrangement with and without compression support.
1185 XRAN packet meant for traffic with compression enabled has the
1186 Compression Header added after each Application Header. According to
1187 ORAN Fronthaul's specification, the Compression Header is part of a
1188 repeated Section Application Header. In the xRAN library implementation,
1189 the header is implemented as a separate structure, following the
1190 Application Section Header. As a result, the Compression Header is not
1191 included in the xRAN packet, if compression is not used.
1193 Figure 14 shows the components of an xRAN packet.
1195 .. image:: images/xRAN-Packet-Components.jpg
1197 :alt: Figure 14. xRAN Packet Components
1199 Figure 14. xRAN Packet Components
1201 Radio Application Header
1202 ~~~~~~~~~~~~~~~~~~~~~~~~
1204 The next header is a common header used for time reference.
1206 .. image:: images/Radio-Application-Header.jpg
1208 :alt: Figure 15. Radio Application Header
1210 Figure 15. Radio Application Header
1212 The radio application header specific field values are implemented as
1219 - subframeId = [0:9]
1225 Data Section Application Data Header
1226 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1228 The Common Radio Application Header is followed by the Application
1229 Header that is repeated for each Data Section within the eCPRI message.
1230 The relevant section of xRAN packet is shown in color.
1232 .. image:: images/Data-Section-Application-Data-Header.jpg
1234 :alt: Figure 16. Data Section Application Data Header
1236 Figure 16. Data Section Application Data Header
1239 A single section is used per one Ethernet packet with IQ samples
1240 startPrbu is equal to 0 and numPrbu is wqual to the number of RBs used:
1242 - rb field is not used (value 0).
1244 - symInc is not used (value 0)
1249 An xRAN packet data payload contains a number of PRBs. Each PRB is built
1250 of 12 IQ samples. Flexible IQ bit width is supported. If compression is enabled udCompParam is included in the data payload. The data section is shown in colour.
1252 .. image:: images/Data-Payload.jpg
1254 :alt: Figure 17. Data Payload
1256 Figure 17. Data Payload
1261 C-Plane messages are encapsulated using a two-layered header approach.
1262 The first layer consists of an eCPRI standard header, including
1263 corresponding fields used to indicate the message type, while the second
1264 layer is an application layer including necessary fields for control and
1265 synchronization. Within the application layer, a “section” defines the characteristics of U-plane data to be transferred or received from a
1266 beam with one pattern id. In general, the transport header,application
1267 header, and sections are all intended to be aligned on 4-byte boundaries
1268 and are transmitted in “network byte order” meaning the most significant
1269 byte of a multi-byte parameter is transmitted first.
1271 Table 9 is a list of sections currently supported.
1273 Table 9. Section Types
1275 +--------------+--------------------------+--------------------------+
1276 | Section Type | Target Scenario | Remarks |
1277 +--------------+--------------------------+--------------------------+
1278 | 0 | Unused Resource Blocks | Not supported |
1279 | | or symbols in Downlink | |
1281 +--------------+--------------------------+--------------------------+
1282 | 1 | Most DL/UL radio | Supported |
1284 +--------------+--------------------------+--------------------------+
1285 | 2 | reserved for future use | N/A |
1286 +--------------+--------------------------+--------------------------+
1287 | 3 | PRACH and | Only PRACH is supported. |
1288 | | mixed-numerology | Mixed numerology is not |
1289 | | channels | supported. |
1290 +--------------+--------------------------+--------------------------+
1291 | 4 | Reserved for future use | Not supported |
1292 +--------------+--------------------------+--------------------------+
1293 | 5 | UE scheduling | Not supported |
1294 | | information (UE-ID | |
1295 | | assignment to section) | |
1296 +--------------+--------------------------+--------------------------+
1297 | 6 | Channel information | Not supported |
1298 +--------------+--------------------------+--------------------------+
1299 | 7 | LAA | Not supported |
1300 +--------------+--------------------------+--------------------------+
1301 | 8-255 | Reserved for future use | N/A |
1302 +--------------+--------------------------+--------------------------+
1304 Section extensions are not supported in this release.
1306 The definition of the C-Plane packet can be found lib/api/xran_pkt_cp.h
1307 and the fields are appropriately re-ordered in order to apply the
1308 conversion of network byte order after setting values.
1309 The comments in source code of xRAN lib can be used to see more information on
1310 implementation specifics of handling sections as well as particular fields.
1311 Additional changes may be needed on C-plane to perform IOT with O-RU depending on the scenario.
1323 This header is defined as the structure of xran_ecpri_hdr in
1326 Radio Application Common Header
1327 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1329 The Radio Application Common Header is used for time reference. Its
1330 structure is shown in Figure 18.
1332 .. image:: images/Radio-Application-Common-Header.jpg
1334 :alt: Figure 18. Radio Application Common Header
1336 Figure 18. Radio Application Common Header
1338 This header is defined as the structure of
1339 xran_cp_radioapp_common_header in lib/api/xran_pkt_cp.h.
1341 Please note that the payload version in this header is fixed to
1342 XRAN_PAYLOAD_VER (defined as 1) in this release.
1344 Section Type 0 Structure
1345 ~~~~~~~~~~~~~~~~~~~~~~~~
1347 Figure 19 describes the structure of Section Type 0.
1349 .. image:: images/Section-Type-0-Structure.jpg
1351 :alt: Figure 19. Section Type 0 Structure
1353 Figure 19. Section Type 0 Structure
1355 In Figure 18 through Figure 22, the color yellow means it is a transport
1356 header; the color pink is the radio application header; others are
1359 Section Type 1 Structure
1360 ~~~~~~~~~~~~~~~~~~~~~~~~
1362 Figure 20 describes the structure of Section Type 1.
1364 .. image:: images/Section-Type-1-Structure.jpg
1366 :alt: Figure 20. Section Type 1 Structure
1368 Figure 20. Section Type 1 Structure
1370 Section Type 1 message has two additional parameters in addition to
1371 radio application common header:
1373 - udCompHdr : defined as the structure of xran_radioapp_udComp_header
1375 - reserved : fixed by zero
1377 Section type 1 is defined as the structure of xran_cp_radioapp_section1,
1378 and this part can be repeated to have multiple sections.
1380 Whole section type 1 message can be described in this summary:
1382 +----------------------------------+
1383 | xran_cp_radioapp_common_header |
1384 +==================================+
1385 | xran_cp_radioapp_section1_header |
1386 +----------------------------------+
1387 | xran_cp_radioapp_section1 |
1388 +----------------------------------+
1390 +----------------------------------+
1391 | xran_cp_radioapp_section1 |
1392 +----------------------------------+
1394 Section Type 3 Structure
1395 ~~~~~~~~~~~~~~~~~~~~~~~~
1397 Figure 21 describes the structure of Section Type 3.
1399 .. image:: images/Section-Type-3-Structure.jpg
1401 :alt: Figure 21. Section Type 3 Structure
1403 Figure 21. Section Type 3 Structure
1405 Section Type 3 message has below four additional parameters in addition
1406 to radio application common header.
1410 - frameStructure: defined as the structure of
1411 xran_cp_radioapp_frameStructure
1415 - udCompHdr: defined as the structure of xran_radioapp_udComp_header
1417 Section Type 3 is defined as the structure of xran_cp_radioapp_section3
1418 and this part can be repeated to have multiple sections.
1420 Whole section type 3 message can be described in this summary:
1422 +----------------------------------+
1423 | xran_cp_radioapp_common_header |
1424 +==================================+
1425 | xran_cp_radioapp_section3_header |
1426 +----------------------------------+
1427 | xran_cp_radioapp_section3 |
1428 +----------------------------------+
1430 +----------------------------------+
1431 | xran_cp_radioapp_section3 |
1432 +----------------------------------+
1434 Section Type 5 Structure
1435 ~~~~~~~~~~~~~~~~~~~~~~~~
1437 Figure 22 describes the structure of Section Type 5.
1439 .. image:: images/Section-Type-5-Structure.jpg
1441 :alt: Figure 22. Section Type 5 Structure
1443 Figure 22. Section Type 5 Structure
1446 Section Type 6 Structure
1447 ~~~~~~~~~~~~~~~~~~~~~~~~
1449 Figure 23 describes the structure of Section Type 6.
1451 .. image:: images/Section-Type-6-Structure.jpg
1453 :alt: Figure 23. Section Type 6 Structure
1455 Figure 23. Section Type 6 Structure
Code Review / o-du / phy.git / blob