PIP: A Connection-Oriented, Multi-Hop, Multi-Channel TDMA-based MAC for High Throughput Bulk Transfer

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1 PIP: A Connection-Oriented, Multi-Hop, Multi-Channel TDMA-based MAC for High Throughput Bulk Transfer Bhaskaran Raman Kameswari Chebrolu Sagar Bijwe br@cse.iitb.ac.in chebrolu@cse.iitb.ac.in sag.bijwe@gmail.com Vijay Gabale vijaygabale@cse.iitb.ac.in SyNerG: Systems and Networks Group Department of CSE, IIT Bombay, India SenSys 2010

2 Motivating Example Structural health monitoring Sink Source (sensing nodes, bulk data) Other applications: Volcanic activity monitoring (50KB/sensor), bulk data collection in sensor network Goal: Effective and efficient delivery of sensed data over a multi-hop wireless sensor network.

3 Requirements and Challenges Goal: Effective and efficient delivery of sensed data over a multi-hop wireless sensor network. Quick data transfer/high Throughput Event detection ability is minimally affected. Collects data from large sensor network. Energy savings after data collection. Mitigating Inter path, Intra path interference? Using multiple channels for spatial efficiency? Reliability Delivers important fragments of data. Handling wireless packet errors?

4 Focus of This Work A TDMA-based MAC primitive for bulk data transfer What is the capacity upper bound for bulk transfer on an based multihop wireless network? What is the efficacy of a time synchronization mechanism for a multi-hop wireless network? PIP: A TDMA-based MAC for high throughput bulk transfer

5 Outline of Talk PIP Design Choices A Transport Protocol using PIP MAC PIP Implementation PIP Evaluation Related Work Conclusion

6 PIP MAC: Design Choices

7 PIP: Design Choices Goal: Effective and efficient delivery of sensed data over a multi-hop wireless sensor network. Mitigating Inter path*, Intra path interference Using multiple channels for spatial efficiency 1. Channel Access: TDMA 2. Access Control: Centralized 3. Multi-Channel Operation 4. Connection-oriented MAC Handling wireless packet errors *We assume one flow at a time, and thus do not consider inter-path interference much like in Flush, Fetch.

8 PIP: Design Choices Goal: Effective and efficient delivery of sensed data over a multi-hop wireless sensor network. Mitigating Intra path interference 1. Channel Access: TDMA Time divided into a frame. A frame divided into slots. Interfering links on different slots. Using multiple channels for spatial efficiency L1 Handling wireless packet errors What is the efficacy of time sync in practice? Later in Evaluation. Slots Frame L2 L3 L4 L1 & L4 L2 L L1 & L4

9 PIP: Design Choices Goal: Effective and efficient delivery of sensed data over a multi-hop wireless sensor network. Mitigating Intra path interference Using multiple channels for spatial efficiency 1. Channel Access: TDMA 2. Access Control: Centralized 3. Multi-Channel Operation L1 Handling wireless packet errors Interfering links on different channels Ch 2 Ch 1 Slots Frame L2 L3 L3 L4 L3 L4 L1 L2 L1 L L4 50% thrput improvement

10 PIP: Design Choices Goal: Effective and efficient delivery of sensed data over a multi-hop wireless sensor network. Mitigating Intra path interference Using multiple channels for spatial efficiency Handling wireless packet errors 1. Channel Access: TDMA 2. Access Control: Centralized 3. Multi-Channel Operation Reliability Loss of time-sync Per-hop Ack In-band time sync

11 PIP: Design Choices Goal: Effective and efficient delivery of sensed data over a multi-hop wireless sensor network. Mitigating Intra path interference Using multiple channels for spatial efficiency 1. Channel Access: TDMA 2. Access Control: Centralized 3. Multi-Channel Operation 4. Connection-oriented Handling wireless packet errors Connection-state for a node: (slot, channel, sender/receiver).

12 PIP: MAC Interfaces Transport protocol is simplified using PIP MAC module. Transport module status send(pkt_type, pkt_body, pkt_len, extra_params) void senddone(pkt_type, status) pkt_type: ConnReq, Data, EOF, SNACK, TearDown Sink void recv(pkt_type, pkt_body, pkt_len, extra_params) void abortconn() Phase 2 send() recv() ConnReq Data EOF SNACK... nodelist getpath(nodeid) PIP MAC module TimeSync module Phase 1 Source Routing module Phase 3 TearDown 3 phases: Schedule dissemination, data transfer, tear down

13 PIP: MAC Operation E D Sink Has routing path, computes schedule C B A Source U1C Bulk data

14 PIP: MAC Operation E Sink D C B Schedule + Conn Request Extract schedule info Forward request Start MAC level timer Tune to reception data channel A Source U1C/ UMC

15 PIP: MAC Operation E Sink D C B Schedule + Conn Request Data + Ack A Source.... In-band time sync SMC Data packets carry time sync info Nodes synchronized to source

16 PIP: MAC Operation E Sink D C B A Schedule + Conn Request Data + Ack Source.. EOF.. SMC SNACK.... EOF: End Of File SNACK: Selective Negative Ack

17 PIP: MAC Operation E D C B A Schedule + Conn Request Sink Data + Ack Source.. EOF.. SNACK.... Tear Down A C Odd (slot 1) Even (slot 2) CH1 CH1 CH2 B B D D CH2 C E SMC PIP: Pipelining of Packets along the path

18 PIP: Features Combination of design choices is unique for PIP to achieve multi-hop bulk transfer. Protocol is simple to implement on resource constrained platforms. In-built and on-demand time synchronization. Periodic data packets carry timing info, no separate channel required for time sync.

19 PIP: Prototype Implementation

20 PIP: Prototype Implementation Software/Hardware Platform: Telosb Platform TI MSP 430 MCU (8MHz, 10K RAM, 48K Flash) CC Radio (250Kbps, TX/RX Buffer = 128 B) Onboard Antenna (50m Indoors) TinyOS SFD based Time Sync: Hardware level timestamping (e.g. TSMP) No software latency Clock skew ~2 ticks (1 tick = 30.5 us) All functionss of the MAC implemented in prototype. Data of 103 B. Logging module to collect logs at each node

21 PIP: Guard Band, Frame Duration Component Measured value (1 tick = 30.5 micro-sec) Time sync error (a) right after sync +/- 1 tick per hop (b) drift error < 1.5 ticks/sec Guard Time = 15 ticks. Slot Time = 200 ticks. Transmission + ACK Inaccuracy in timer fire 1-2 ticks Frame Duration = ( ) X 2 = 430 ticks. Processing jitter 1-2 ticks Channel switching time ~ 10 ticks RX TX RX TX RX TX Frame Duration RX TX RX TX RX TX Time Sync is required only w.r.t. neighboring nodes.

22 PIP: Pipelining Inside a Node No Pipelining With Pipelining MCU CC2420 MCU CC RX BUF Tmote Sky platform Critical Path: TX BUF

23 PIP: Pipelining Inside a Node No Pipelining With Pipelining 1 2 MCU 2 CC2420 MCU CC RX BUF Tmote Sky platform Critical Path: TX BUF

24 PIP: Evaluation and Comparison 10 node (9 hop) implementation results Used Implementation parameters for PIP simulator Modeling a node's queue as DTMC and analytical results

25 PIP: Throughput vs. Number of Nodes ~ 63Kbps throughput, 12 X improvement over Flush. Simulation, analytical and implementation results match.

26 PIP: Throughput vs. Number of Nodes Throughput decreases slightly. PIP throughput decreases only slightly with number of nodes. PIP throughput is robust to error rates.

27 PIP: Throughput Upper Bound Radio capacity of 250 Kbps = 138 ticks/128 B packet Single radio forwarding, capacity reduced to 125 Kbps = 276 ticks/128 B packet Ack packet reception 37 ticks Software overhead (e.g. interrupts, logging) 25 ticks Guard band 15 ticks total ticks = * ( ) = 430 (frame duration) Effective throughput = 103 * 8 / 430 =~ 63 Kbps

28 PIP: Throughput Comparison How would it have helped had PIP been used for the Volcano Monitoring application? Fetch Flush No. No. of of Single Single Total Single Single Hops Nodes flow thr' flow Lat Latency flow thr' flow Lat put (Kbps) ency (sec) (sec) put (Kbps) ency (sec) Total Latency (sec) PIP Single Single Total flow thr' flow Lat Latency put (Kbps) ency (sec) (sec) Effectiveness due to the multi-channel TDMA Time required/node to transfer data is ~7 seconds. Node s ability to sense the events is minimally affected!

29 PIP: Comparison with Flush For 10% error rate, PIP gives 50Kbps whereas Flush gives 8.5Kbps, a factor of 5.6 improvement over Flush.

30 PIP: External Interference PIP: Data Transfer In Progress E E D C 5 Mhz channel of WiFi source (channel occupancy of ~2.3 ms) B A 22 Mhz Channel of Question: Performance of PIP in the presence of WiFi interference (in 2.4 Ghz frequency range)?

31 PIP: External Interference, Channel Hopping Node follows a frequency sequence of {k, k+1,..., n, 1,... } in circular fashion Sequence conveyed during connection set up. E E Frequency/channel hopping across slots D C 5 Mhz channel of WiFi source (channel occupancy of ~2.3 ms) B A 22 Mhz Channel of Question: Performance of PIP in the presence of WiFi interference (in 2.4 Ghz frequency range)?

32 PIP: External Interference, Channel Hopping Frequency hopping effective in mitigating external interfernece.

33 PIP: External Interference, Channel Hopping Frequency hopping effective in mitigating external interfernece.

34 PIP: External Interference, Channel Hopping Frequency hopping effective in mitigating external interfernece.

35 Related Work Centralized Connection less Connection Connection less oriented Connection oriented Coordinated (TDMA) Uncoordinated (CSMA) Single chnl. Distributed Multi chnl. Single chnl. Multi chnl. NA NA BMAC HOP DCC (two-radio) NA NA Flush NA NA NA RT-Link Wimax, TSMP, PIP Overlay MAC, CHMA, CHAT, FPS,TRAMA, MMAC, MAP, LMAC, SMAC, SSCH, TMAC McMAC (1-hop) NA NA PIP vs. WiMAX: PIP implementation based evaluation for a bulk transfer application. PIP vs. TSMP/FPS: PIP optimized for bulk data transfer applications, uses data packets themselves for synchronization. PIP vs. Flush: Time synchronized slots to clock the packets. Multiple channels to increase the spatial resuse. Hardware optimization to move packet copy off the critical path.

36 PIP: Concluding Remarks Goal: Achieve high thorughput bulk data transfer A highly efficient centralized multi-channel TDMA system Effective time sync mechanism Non-requirement of flow control Feasibility & effectiveness via implementation & evaluation Enables fast data transfer Robust to wireless packet errors, external interference Low memory requirement: queue size of 10 packets

37 Thanks! Questions??? PIP publication/presentation/source code at: Vijay Gabale SyNerG: Systems and Networks Group SenSys 2010

38 PIP: Pipelining Inside a Node and Slot Size TX (R) done Timer fired, start TX(R) E_SFD detected, start ACK timer RX (R) done FIFOP detected, cancel ACK timer i-1 S_SFD detected, start RX(S) TX_half_frame FIFOP high i+1 S_SFD start TX(S) i RX (S) done Packet received i RX_half_frame TX (S) done Switch to RX channel, set next timer Slot size = max (TX(R), RX(R), TX(S), RX(S)) = TX(R) TX(R) = T (MAC payload 103 B + Time stamp 4 B + PIP header 3 B header 12 B) + T (ACK 4 B) + Software Overhead = = 200 ticks

39 PIP: Synchronization and Pipelining Node Direction of Flow 1 2 TX RX RX TX TX RX RX TX TX RX RX TX 3 TX RX TX RX TX RX 4 RX TX RX TX RX TX 5 TX RX Global Time TX RX TX RX Guard Band Guard Band: (1) No transmission (2) Continue reception

40 PIP: Requirement of Queue Size Queue requirement: To account for temporary variations in error rates of the incoming versus the outgoing wireless hop. We choose queue size of 10 for our implementation.

41 PIP: Non-requirement of Flow Control Flow control: In simulator, a node magically knows queue state of downstream node and refrains from transmitting. PIP performs well despite no flow control.

42 PIP: Time Sync Mechanism Node 1 MCU Node 2 CC2420 Capture S_SFD, insert global timestamp (T1) CC2420 MCU Capture S_SFD, record local time (T2) Offset of Node 2: T1 - T2. Hardware level timestamping, no software latency. Clock skew of ~2 ticks (1 tick ~ 30.5 us). Periodic data packets keep clock correction to minimal.

43 PIP: External Interference, Channel Hopping External interference in wireless networks Performance of PIP in the presence of WiFi in 2.4 Ghz range? Frequency/channel hopping in slots of the frame: Node follows a frequency sequence of {k, k+1,..., n, 1,... } in circular fashion Sequence conveyed during connection set up. Experimental set up: WiFi source on channel 6 (center frequency of Ghz) Interferences with five 5Mhz channels WiFi source generates 1777 B at 6Mbps (channel occupancy of ~2.3ms) for varing the inter-packet time.

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