5GC000633 Airphone tester for
3GPP on CPRI:
L1/CPRI impacts
Desire GUEL
5G BL System Engineering
18th Jully 2017
1
© Nokia 2016
5GC000633 Airphone tester for 3GPP on CPRI - L1 impacts
Overview (Scope):
This feature covers the overall functionality and use cases in 5G18A.
•
The AirPhone is connected to gNB via CPRI – none RU used
•
HW configuration : Airphone & gNB configuration shall be based on ASIA/ASIK + ABIK
•
Single OAM (SOAM) on the gNB configuration and StandAlone OAM on Airphone
•
Support of RU C&M messages/ services  Radio Stub (RU Emulated on ASIA/ASIK in Airphone)
•
Support RFSW RP1 IF (or extended IF): Interface between Node OAM and RFSW
•
gNB GNSS (1PPS & ToD) source used for AirPhone and gNB sync via CPRI link.
•
•
•
2
RU/U-plane (I/Q data) emulation not supported (Beamforming, RF functionalities testing out of scope)
The Radio Stub shall handling the "real" RFSW functions/services with some restrictions to be
determined (TBD):
o
(shutdown, restart CPRI, SW upgrade, Temperature conrtol, etc)
eLLF out of scope, not supported before 5G19
© Nokia 2016
5GC000633 Airphone tester for 3GPP on CPRI - L1 impacts
5G NodeB Startup with SOAM (5G_RAN_USR_1657)
(0) PLATFORM Startup
(1) RAC/VNF Startup
(2) OAM C-Plane Startup :
C-Plane configuration, Backhaul transport configuration, L1, L2, L3 Pools to C-Plane, Sub-cell
mapping & setup, Sub-cell group map & setup
(3) RAP Startup - ABIK board, RU hardware/Software are started up
(4) RU Detection
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© Nokia 2016
(4a) Ethernet enabled on CPRI to RF module.
CPRI config is determined/auto-negotiated. RU SW is updated if necessary.
(4b) RAU detects RU
(4c) IP address for RU allocated. C&M link is established between the RAU and RU.
(4d) L1 Control S/W on ABIK/K2 configures CPRI Links.
(5) RU communication (5a) O&M communication to RFSW RP1.
(5b) Fiber length (ABIK to RU) is determined by L1 software and OAM software determines if
Fiber length has been exceeded, or fiber differential length has been exceeded (5GC000350).
(5c) Management of dynamic timing
(6) L1 Configuration - The SOAM is involved with L1 configuration (cable length detection)
(6a) SOAM messages to L1 for CPRI configuration
(6b) Delay configuration & setting
5GC000633 Airphone tester for 3GPP on CPRI - L1 impacts
Feature impacts:
RFSW:
 Radio Stub (RU C&M services emulated) to be implemented on ASIK/ASIA in Airphone  It should handle all
the RFSW functions/services.
 Radio Stub SW could be based on existing RU SW or implemented from scratch
OAM:
 RU C&M messages/ services to be supported through the extended RFSW RP1 IF
 Addtional delay introduced to the response of OAM SW request messages to Radio Stub (RU emulator)
CPRI/L1:
 The RFSW RP1 route to be updated/extended as it is terminated in ASIK/ASIA in Airphone where the Radio stub
is located.
 RFSW RP1 communication should include a new SICAD address configuration (Syscom route) in Airphone side
to extend the RP1 over CPRI route until the ASIK/ASIA in Airphone.
 CPRI – CPRI configuration/Synchronization
PSSW:
 Radio Stub (DHCP client) shall obtains IP address over CPRI? from FCT AXM in ASIA (DHCP Server)
 Radio Stub should able to provide/update the RU SW version on the request of Node OAM.
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© Nokia 2016
5GC000633 Airphone tester for 3GPP on CPRI - L1 impacts
- L1 impacts (1)
CPRI/L1:
 The RFSW RP1 route to be updated/extended as it is terminated in ASIK/ASIA in Airphone where the Radio stub
is located.
 RFSW RP1 communication should include a new SICAD address configuration (Syscom route) in Airphone side
to extend the RP1 over CPRI route until in the ASIK/ASIA in Airphone.
 CPRI – CPRI configuration/Synchronization
RU (Emulat ed) ASIA <-> ASIA OAM
APPLI
(RFSW RP1)
Node OAM
Syscom GW
SICP
SICP
Linux IPC
Linux
IPC
OAM RU
SICP
SRIO
(T11)
ASIA, AXM
Syscom GW
UDPCP
UDP
UDP
IP
IP
SICP
SRIO
(T11)
© Nokia 2016
ETH
1GE
ABIK, CC&S,K2
AirScale(Airphone)
5
Syscom GW
UDPCP
ETH Switch
1GE
CPRI R8
ABIK, FE FPGA
ETH Switch
CPRI R8
1GE
FE FPGA, ABIK
ETH
1GE
Syscom GW
SICP
SICP
SICP
SRIO
(T11)
SRIO
(T11)
Linux
IPC
CC&S,K2, ABIK
AirScale (5GNB)
AXM,ASIA
SICP
Linux IPC
Node OAM
AXM,ASIA
5GC000633 Airphone tester for 3GPP on CPRI - L1 impacts
- L1 impacts (2)
1. The route from Radio Stub in ASIx to CPRI in Airphone could have some impacts on ABIK/L1 SW in Airphone?
2. Dedicated CPRI config is needed? New module to be developed in L1-Airphone?
3. How it could be handled the CPRI configuration/auto-negotiation(CPRI rates for ex.) ?
4. From 5GC000425, connection from ABIK/L1-SW to Radio Stub to be established at CPRI level in 5GC000633?
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© Nokia 2016
5GC000633 Airphone tester for 3GPP on CPRI - L1 impacts
- L1 impacts (2a)
Airphone
(AirScale)
5GNB
(AirScale)
Radio
Stub
Node
OAM
ASIA
ASIA
RFSW RP1
CPRI
ABIK
ABIK
K2+3 x FPGA
L1
K2+3 x FPGA
L1
CPRI configuration
CPRI configuration
CPRI (Sync, C&M messages, IQ samples)
1. 5GC000633 shall not have impacts on L1/CPRI at 5GNB onwards 5GC000425.
2. The L1/CPRI should be impacted at Airphone side to establish the Ethernet on CPRI connection (C&M
communication)
o Configuration, setup of pointer P ( bandwidth of C&M message negotiation) at Airphone side?
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© Nokia 2016
5GC000633 Airphone tester for 3GPP on CPRI - L1 impacts
- L1 impacts (3) : CPRI TX and RX datapath synchronization (No impacts expected)
Time diagram in TX
radio_frame_start
(common for all BTS)
L1 sends IQ data via CPRI
In “5GUE Airphone testing” mode:
RP1 sync burst
Offset_A
cable_delay
L1 BCN.N2 (BTS)
radio_frame_start = Offset_A + cable_delay + dfe_tx_delay
radio_frame_start
(common for all BTS)
L1 receives IQ data via CPRI
RP1 sync burst
N_TA_offset
cable_delay
Offset_B
dfe_rx_delay
L1 BCN.N2
0
radio_frame_start = Offset_B – dfe_rx_delay – cable_delay – UL_alignment_delay + N_TA_offset
Reference: BB L1 synchronization for 5G17A
8
© Nokia 2016
cable_delay = 0 for Airphone, non-zero for
5GNB
•
dfe_tx_delay = 0 (no DFE TX)
•
dfe_tx_delay = 0 (no DFE RX)
•
N_TA_offset = 0 (425-E towards)/768 (425-F
onwards)
dfe_tx_delay
0
Time diagram in RX
•
5GC000633 Airphone tester for 3GPP on CPRI - L1 impacts
- L1 impacts (4) on the Reception of L3a VSB messages ?
5GNB
RF module
FE FPGA
L1 SW
OAM
L3a Discovery message
polling
API_L1SW_CPRI_DISCOVERY_IND_MSG
ACK
L3a ACK
• FE FPGA should implement possibility to receive L3a messages and send the response (acknowledgement) messages.
• L3a messages are transferred over CPRI VSB region. With this protocol, RF module is sending “discovery messages” and L1 is
responding to the RF with acknowledgements.
Ethernet VSB regions ( CPRI) has to be established. IP address allocation, Ethernet configuration & optical transport connections
Reference: CPRI on Front End for 5G17, 5G17A-CT, 5G17A
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© Nokia 2016
5GC000633 Airphone tester for 3GPP on CPRI - L1 impacts
- L1 potentials impacts :
FPGA Impacts: No impacts identified.
L1 SW impacts:
 Airphone is time synchronized with gNB via the HDMI sync cable which synchronizes the BCN.N1 on both
sides.
As the Airphone is BCN synchronized via HDMI “sync in” port of ABIK  Need to check if a particular
configuration is mandatory at Airphone side.
 Ethernet bandwidth (pointer P) negotiation/configuration for Ethernet over CPRI connection establishment :
o Potential impact on CPRI config handle by L1SW.
o Check the operability of the Ethernet over CPRI with CPRI Master to Master connection.
 No really L1 impact, BBP impact for a new Syscom route establishment in Airphone side to extend the RP1
over CPRI communication until the Radio Stub (implemented in the ASIK/ASIA of Airphone).
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© Nokia 2016
Backup
11
09/07/2023
Confidential
© Nokia 2017 - Jussi Sipola
5GC000633 Airphone tester for 3GPP on CPRI - L1 impacts
RU (Emulat ed) ASIK <-> ASIK OAM
APPLI
(RFSW RP1)
SICP
SICP
Linux IPC
UDPCP
UDPCP
UDP
UDP
OAM RU
IP
IP
Linux
IPC
Node OAM
Syscom GW
Syscom GW
ETH
ETH Switch
GRETAP
GRETAP CPRI R8
CC&S
ETH
ETH Switch
CPRI R8
SICP
Linux
IPC
Linux IPC
GRETAP
GRETAP
Node OAM
CC&S
FE + K2
K2+FE
SICP
AirScale(5GNB)
AirScale(Airphone)
RU (Emulat ed) ASIA <-> ASIK OAM
APPLI
(RFSW RP1)
Syscom GW
SICP
SICP
SICP
SICP
Linux
IPC
SRIO
(T11)
SRIO
(T11)
UDPCP
UDPCP
UDP
UDP
IP
IP
Linux IPC
OAM RU
ETH
1GE
ABIK, CC&S,K2
ASIA, AXM
ETH Switch
1GE
CPRI R8
ETH
ETH Switch
CPRI R8
OAM RU
Linux IPC
Node OAM
CC&S
Node OAM
Syscom GW
SICP
SICP
SICP
Linux
IPC
SRIO
(T11)
SRIO
(T11)
Syscom GW
UDPCP
UDPCP
UDP
UDP
IP
© Nokia 2016
Linux
IPC
RU (Emulat ed) ASIA <-> ASIA OAM
Syscom GW
12
SICP
AirScale (5GNB)
APPLI
(RFSW RP1)
Linux IPC
SICP
GRETAP
GRETAP
FE + K2
ABIK, FE FPGA
AirScale(Airphone)
SICP
Node OAM
Syscom GW
Syscom GW
ASIA, AXM
ETH
1GE
ABIK, CC&S,K2
AirScale(Airphone)
Syscom GW
SICP
SICP
SICP
SRIO
(T11)
SRIO
(T11)
Linux
IPC
SICP
IP
ETH Switch
1GE
CPRI R8
ABIK, FE FPGA
ETH Switch
CPRI R8
1GE
FE FPGA, ABIK
ETH
1GE
CC&S,K2, ABIK
AirScale (5GNB)
AXM,ASIA
Linux IPC
Node OAM
AXM,ASIA