Time Synchronization Service Interface and Preemption. Christian Boiger IEEE Interim September 2014 Ottawa, Canada
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1 automotive mobile automation embedded systems Time Synchronization Service Interface and Preemption Christian Boiger IEEE Interim September 2014 Ottawa, Canada
2 Overview The first version of this presentation is outdated due to discussion happening during the IET meeting on Tuesday. This is an updated version. The last slides try to reflect some of the discussed solutions. 11 September 2014 IEEE TSN TG - Ottawa, Canada 2
3 Overview The Time Synchronization Service Interface (TSSI) was defined in IEEE 802.3bf. IEEE 802.1AS is currently not using the TSSI features. It was explicitly mentioned in the IEEE 802.1ASbt PAR to add this interface to IEEE 802.1AS ( Incorporation of the interfaces specified in IEEE Std 802.3bf into the IEEE full-duplex media-dependent layer model. ) TSSI indicates the reception or transmission of a SFD to the higher layer. It is currently not defined how this indication is exactly used by IEEE 802.1AS. It seems to be necessary to modify the TSSI specification in order to support preemption. As Preemption and time synchronization will be used in the same network they need to interoperate. 11 September 2014 IEEE TSN TG - Ottawa, Canada 3
4 Assumptions TSSI currently seems to indicate only the reception of normal SFDs. In order to interoperate with preemption, TSSI would need to indicate IET SMDs. The IET SMDs also include non initial fragment SMDs (SMD-Cx). There seems to be no need to indicate the start of non initial fragments, therefore this presentation assumes that non initial fragments are not indicated by the TSSI 11 September 2014 IEEE TSN TG - Ottawa, Canada 4
5 Transmit TimeSync Client MAC Client MA_DATA.request MA_DATA.request TS_TX.indication emac (high priority) PLS_DATA.request MAC Merge Layer pmac (low priority) PLS_DATA.request PLS_DATA.request grs 11 September 2014 IEEE TSN TG - Ottawa, Canada 5
6 Transmit Example Without Preemption: MA_DATA.request: Transmitted: S Sync TS_TX.indication: S With Preemption: emac:ma_data.request: pmac:ma_data.request: S 4 Transmitted: Sync TS_TX.indication: S 11 September 2014 IEEE TSN TG - Ottawa, Canada 6
7 Receive TimeSync Client MAC Client MA_DATA.indication MA_DATA.indication TS_RX.indication emac (high priority) PLS_DATA.indication MAC Merge Layer pmac (low priority) PLS_DATA.indication PLS_DATA.indication grs 11 September 2014 IEEE TSN TG - Ottawa, Canada 7
8 Receive Example Without Preemption: MA_DATA.indication: Received: S Sync TS_RX.indication: S With Preemption: emac:ma_data.indication: pmac:ma_data.indication: Received: #1 3 2#2 Sync S TS_RX.indication: S 11 September 2014 IEEE TSN TG - Ottawa, Canada 8
9 Issue IET provides two MAC interfaces, but TSSI provides only one set of TSSI indications. This makes the TSSI indications ambiguous. Indications of frames transmitted by the pmac might arrive after one or more indications of emac frames. In order to match the corresponding frames and indications, it would be necessary to check if the pmac has finished its transmission and is ready to transmit another frame. In that case the last indication would correspond with this frame (as long as the pmac frame is not preempted) Indications of frames received by the emac (and pmac if the frames get preempted) cannot be associated with each other. The solution to this might not be within our scope, if we decide that this is a real issue, we might need to talk to September 2014 IEEE TSN TG - Ottawa, Canada 9
10 Possible Solutions It is guaranteed that PTP event frames are never preempted, use only the pmac and the knowledge of the status of the transmission (transmission finished) is available. TSSI only indicates the transmission of SMDs of one MAC (configurable or only pmac?) There are two sets of TSSI indications, one for each MAC Other? 11 September 2014 IEEE TSN TG - Ottawa, Canada 10
11 Solutions Discussed in IET (1) TimeSync Client MAC Client TS_RX.indication TS_TX.indication TS_RX.indication TS_TX.indication TSSI emac (high priority) MAC Merge Layer pmac (low priority) PHY Two sets of indications, one for each MAC. 11 September 2014 IEEE TSN TG - Ottawa, Canada 11
12 Solutions Discussed in IET (2) TimeSync Client MAC Client TS_TX.indication(SMD) TS_RX.indication(SMD) TS_TX.indication TS_RX.indication emac (high priority) pmac (low priority) SMD: SMDE_DETECTED SMDS_DETECTED TSSI MAC Merge Layer PHY One set of indications with parameters distinguishing between emac and pmac frames. 11 September 2014 IEEE TSN TG - Ottawa, Canada 12
13 Transmit Example Without Preemption: MA_DATA.request: Transmitted: TS_TX.indication: With Preemption: emac:ma_data.request: pmac:ma_data.request: Transmitted: pmac:ts_tx.indication: emac:ts_tx.indication: 1 2#1 3 2# September 2014 IEEE TSN TG - Ottawa, Canada 13
14 Receive Example Without Preemption: MA_DATA.indication: Received: TS_RX.indication: With Preemption: emac:ma_data.indication: pmac:ma_data.indication: Received: pmac:ts_rx.indication: emac:ts_rx.indication: #1 3 2# September 2014 IEEE TSN TG - Ottawa, Canada 14
15 automotive mobile automation embedded systems Thank You 11 September 2014 IEEE TSN TG - Ottawa, Canada 15
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