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OPERA BPL (c) 2013 R. Newman University of Florida.

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Presentation on theme: "OPERA BPL (c) 2013 R. Newman University of Florida."— Presentation transcript:

1 OPERA BPL (c) 2013 R. Newman University of Florida

2 What is OPERA? Open industry standard for Access PLC –1 manufacturer (DS2) –Incompatible with HP1.0, other 2-30MHz PLC –Submitted (not selected) for IEEE P1901 Access Developed 2007 by Open PLC European Research Alliance (OPERA) –Consortium of chip designers, OEMs, PLC users, university researchers –European focus Ethernet class PLC –200 Mbps raw PHY data rate

3 Physical PLC Access Network HE = Head End (master, connects to backhaul) R = Time Division Repeater (slave/master) CPE = Customer Premises Equipment (slave)

4 Network Reference Model

5 OPERA Protocol Layers Bridging Accepts/delivers ethernet frames Convergence Layer Converts between ethernet frames and BPL CLPDUs Sets priority, handles multicast/broadcast Logical Link Control (LLC) Sends burst packets Handles encryption/decryption MAC Medium access, management messages PHY OFDM modulation, FEC Management Handles network parameters, etc.

6 OPERA PHY Reed-Solomon Mapping HURTO (8x) on delimiters, Adaptive on data Scrambling 4-D Trellis coded modulation (4D TCM) OFDM 1536 carriers IDFT – CP insertion - window

7 OPERA PPDU SOT Synch symbol Channel reference symbol Control and data symbols Max of 243 symbols total

8 OPERA Frame Control Mapped to one OFDM symbol 176 information bits 16 CRC bits -> 192 bits G(x) = 10001000000100001 RS (12,8,t=2) encoding -> 288 bits FC Interleaver (288 bits)

9 OPERA Access Master/Slave approach HE is master over its network TDR is slave to upstream HE or TDR TDR is master to downstream TDR or CPE CPE is always slave Two access approaches Poll/Select Mechanism CSMA token Poll/Select Master sends to each slave data or distributor frame Finished by token with (list of) slave(s) to get channel May have time limit on access interval CSMA Token Opens prioritized contention among receivers

10 MPDU Structure TA = Token announce delimiter Sender, length of frame BH = Burst header Destination, encryption, FEC, etc.

11 Token Types Token defines frame type Distributor – allocate time to list of slaves Data – allocate to slave (can recurse) Silence – retain control of medium Polling – ask list of slaves if have data TDR polling – to allow TDRs to poll CSMA – open medium to contention Access/Access Reply – for admitting new nodes Non-returnable Clock

12 Simple Network HE is Master HE has data for CPE-1 CPE-1 has data for TDR TDR has data for CPE-2

13 Contention-Free Access Master (HE) sends data to slave with downstream token Slave (TDR) sends data to its slave (CPE-1) with token CPE-1 sends data and upstream token back to TDR TDR sends data and token to CPE-2 CPE-2 returns token to TDR, which returns it to HE

14 Distributor Token Master has data for slave 2 Each slave except slave3 has data for master DT can name at most 5 nodes

15 DT Message Sequence Distributor token may have duration, list Each slave passes token to next slave on list Last slave returns token to master

16 Polling Token Polling token names polled slaves Slaves send SOT in slot in order named if have data

17 QOS Session oriented Service class tags imply QoS requirements 8 Service Classes VBR/CBR/ABR/Best Effort Slave makes request Classify traffic into service class Flow Master Node does Call Admission FMN per service class Give service ID if accepted

18 CSMA Token End of CSMA PPDU has CSMA token Non-overlapping backoff window ranges for various priorities Random selection of slot from range for priority per sender

19 OPERA Security IEEE 802.11i 128-bit AES encryption per CLPDU 128-bit AES CBC MIC per CLPDU fragment IEEE 802.1x/RADIUS key distribution/AAA

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