IEEE 802.11-25/0061r0 Backscattering Operation Overview
Explore the IEEE 802.11-25/0061r0 document on AMP Mono-static Backscattering Operation, discussing the reuse of EPC Gen2 interface, simplified tag design, and synergies with UHF RFID tags. Learn about the proposed protocols, inter-frame space definitions, and high-level protocol flow for AMP. Dive into details on EPC Gen2 logical interface, tag memory commands, and AMP backscattering tag specifications. Discover the proposed advanced operations for authentication and secured communications within the WiFi framework.
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January 2025 doc.: IEEE 802.11-25/0061r0 AMP Mono-static Backscattering Operation Date: 2025-01-09 Authors: Name Affiliations Address Phone email NXP Rui Cao 350 Holger Way, San Jose, CA 95134 rui.cao_2@nxp.com Liwen Chu liwen.chu@nxp.com Hongyuan Zhang hongyuan.zhang@nxp.com Franz Amtmann Mikron-Weg 1, 8101 Gratkorn, Austria franz.amtmann@nxp.com Peter Th ringer peter.thueringer@nxp.com Submission Slide 1 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 Introduction [1, 2] proposed to reuse EPC Gen2 logical interface and channel access for backscattering tag Simplify backscattering tag design Facilitate the synergy with UHF RFID tag In this contribution: Discuss about EPC Gen2 logical interface Propose the simplified protocol for AMP Discuss about the inter-frame space definition Submission Slide 2 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 Recap: High-level Protocol Flow AMP reuses the logical interface of EPC Gen2 protocol [2]: Physical layer AMP will redefine AMP PHY Tag-identification layer the UHF RFID commands are tunneled via the AMP MAC/PHY layer Submission Slide 3 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 EPC Gen2 Logical Interface [3] Tag memory definition and access commands Inventory operation command and flags/state Select command: choose certain tags to identify Inventory command: identify all Tags Sessions, A/B flag per session, Tag state Advanced operation Authentication Secured communications Submission Slide 4 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 AMP Backscattering Tag Tag memory definition and access commands Propose no change to the interface, and selective useful commands Inventory operation Propose to reuse most commands Query command to be updated based on new AMP PHY Comply with TXOP or PPDU limit Tag to hold status/flag among read TXOP or PPDU Inter-frame space: link timing To be updated based on AMP PHY definition Advanced operation Propose to support authentication only Secured communication does not fit into WiFi: ~100ms Submission Slide 5 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 AMP Reader Commands Minimum set Command Tag support Remark as EPC Gen2 Reader usage is optional As EPC Gen2 Update based on AMP PHY Select mandatory Query mandatory Query rep Ack NAK Read mandatory mandatory mandatory mandatory as EPC Gen2 as EPC Gen2 as EPC Gen2 as EPC Gen2 Write mandatory optional as EPC Gen2 as EPC Gen2 New command to be defined in AMP To accommodate TXOP limitation Authenticate Extend mandatory Submission Slide 6 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 Extend Command AMP reader channel access needs to coex with regular WiFi and comply with TXOP Some operation sequence may take longer time e.g. multi-tag inventory, delayed replay Finish the operation sequence in multiple TXOPs or PPDUs A new Extend command can be defined Reader to indicate to the tag The next command is an extension from previous operation Tag to maintain a persistent status and to response in next TXOP or PPDU Submission Slide 7 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 Examples CCA TXOP-1 TXOP-2 Single Tag Reply AMP Reader Extend Authenticate Query Ack Excitation Excitation Excitation Excitation Excitation EPC RN16 Tag Authenticate response T5 T2 T1 T2 T1 Write Excitation Excitation Write response T5 TXOP-1 + TXOP-2 is too long may take milli-second processing time e.g. Write process, Authenticate process Tag may lose energy after TXOP-1 Extend command instruct tag to retain state for in persistent memory Submission Slide 8 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 Inter-Frame Space UHF RFID link timing is very flexible due to flexible data rate, and diverse regulatory requirement in various geographical regions AMP backscattering definition can be much simplified Single DL data rate: 250kbps Single channelization and spectrum mask definition in 2.4GHz Backscattering sequences Immediate reply: inventory operation e.g. Single-Tag reply, and Multi-Tag reply Delayed reply: operations that tags need more time to process before response e.g. Authentication, Write Submission Slide 9 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 Immediate Reply Both Reader and Tag shall response within pre-defined time window during the frame exchange T1: Tag response time T2: Reader response time T3: No reply time wait time Query rep/ NAK AMP Reader Query Ack Excitation Excitation Tag EPC RN16 T2 T1 T2 T1 AMP Reader Query Query rep Query rep Ack Query rep Excitation Excitation Excitation Excitation No reply Tag Invalid ACK No reply RN16 RN16 T1 T2 T1 T2 T1 T3 T1 T3 Submission Slide 10 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 Delayed Reply Reader shall provide energy for the specified time for Tag to process and prepare response Tag shall response within pre-defined time window T5: wait time for Reader AMP Reader Authenticate Excitation Excitation Tag Authenticate response T5 AMP Reader Write Excitation Excitation Tag Write response T5 Submission Slide 11 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 Examples Reuse some of existing WiFi IFS time definition AMP Note Time Description EPC Gen2: value dependent on Tari, minimum 15us T1 Tag Response time 16us (+/-10%) T2 Reader Response time No replay Reader wait time Reader minimum inter- command time Tag processing time for delayed reply 10 or 16us (+/-10%) T3 TBD EPC Gen2: min 0us, no max T4 10 or 16us (+/-10%) EPC Gen2: min T1+T3, no max T5 TBD EPC Gen2: [250us, 20ms] Submission Slide 12 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 Summary Discuss about EPC Gen2 logical interface Memory and access, inventory operation, advanced operation Propose the simplified protocol for AMP Reuse memory definition and access command A subset of required commands New Extend command for TXOP/PPDU limit Discuss about the inter-frame space definition Try to reuse existing IFS values Not to exceed the requirement of the UHF tag Submission Slide 13 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 References [1] 11-24/0836, thoughts-on-amp-uhf-rfid-tags [2] 11-24/1805, time-based-channel-access-discussions [3] EPC UHF Gen2 Air Interface Protocol | GS1 Submission Slide 14 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 SP Do you agree to add the following to the TGbp SFD? The AMP backscattering tag reuses the memory definition and access commands as in EPC Gen2 protocol. Submission Slide 15 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 SP Do you agree to add the following to the TGbp SFD? The AMP defines an Extend command to request the tag to extend the operation sequence in the next TXOP or PPDU. The name and content of the command is TBD Submission Slide 16 Rui Cao, etc. (NXP)
January 2025 doc.: IEEE 802.11-25/0061r0 SP Do you agree to add the following to the TGbp SFD? The nominal response time for AMP backscattering tag is 16us. Submission Slide 17 Rui Cao, etc. (NXP)
