IEEE 802.1CM-2018 pdf free download – IEEE Standard for Local and metropolitan area networks- Time-Sensitive Networking for Fronthaul.
6.2.1 CPRI background
Cliii is a digiti.es’d and serial interface that establishes a connection between REV and RE, i.e.. betestent the blocks into which a BS is split The REV contains the radio ftmetioos of the digital basebsand domain. whereas the RE etsettaitsn the analogue radio frequency functions
REV and RE configintions e flexible. e.g.. sevensl REs can be served by’ one REV or one RE can be served by muhaple REVs flee reference configurations tn 2.3 in Conirnon Public Radio Interface Specification %7.O 18411
CPRI stqi,wsrls the following types of information flows (see 41 in Conwnon Public Radio Interface Specification V7.O 1R]1
a) IV data, which is user plane information m the form of In-phase and Quadrature (IV) modulation data.
b) Control and Manqetnent (CAM) data, which in exchanged between the control and management entities within REV and RE.. and
c) Synchronization data. winch in used for CPRI fraitse ansI time alignment
These differetir Cliii infotittaitont l’low types me nuppoeted separately I’rom each othea as described in 6.2.2.
NOTIE—fratne rekrs in Ethernet frame in thin document CMII tame refrm in the CPRI Crania atmactune t42.7 at Common Public Radio Interface Spenficatmon VU) 11)41,. CMII baste is used only in this sitekiune. The Cliii frame sanictuse is atittned with the 01DM frattie sncturc
62.2 Separation of CPRI Information flows
The dttk’n.’nt CPIU information flows )6.2.l) are st4mpoeaed separately Irons each other by the fnsnthaul bridged network. A flow of frames tuppoers the In-phase mid Quadrature modulataon (IQ) data tnfoeniatiott flow’, and a separate flow’ of franses supports the CAM data infonnatton flow 14) data and CAM data separation in a fronthaul bridged network is deseribed in Clause K.
Synchronization in always provided separately from IQ and C&M data. Stiticlatse 7.4 describes sohdtotts to provide synchronization for RE and REC. For instance. synclmeotsization can be peovided by the fevmnthaul bridged network to the ntobnle itetwork via the profile for teleeunttsttatteatitsn applicatiotis (telecom profile) specified by fl’U-T G11275.l, which ia based on she Precision Time Protocol (PTP) specified in IEEE Std 11*8.
6.13 IQ data requirements
[lii, satbclause detcnhes Class I IV data information flown and their requirements. The tinting of rite rranstnissaon of packets carrying IQ data by at RE and at REV is related to E.IITR.A OF[)M (see r’ I) It) data is exchanged between the RE and the REV regardless of whether user data is exchanged between the User F.qoipmnctsu (VIE) aid the 1)5. This results in periodic lQ data packet transmission Fttrthcrrnore, the same amount of IQ data is transmitted in each period of a particular IQ data flow Therefore. an IQ data flow is a periodic Constant firt Rate I CAR) data flow. The tone interval within winch one ix more packets of an lQ data flow ire semit is called rime wimiouc in thus doetansent. lime wt’sk’ws of a given lQ data flow are back-no-back time intessals whose duration ts identical, The requirentents for IV data flows are provided by the CPRI fitnettonal dceonsposatton requtrensents 191.IEEE 802.1CM pdf download.