IEEE P802.15-25-0172-00-6a: Wireless Networks PHY and MAC Parameters
Explore the detailed submission on PHY frame, MAC superframe parameters, UWB modulation, MAC frame dimensioning, and beacon intervals from the IEEE P802.15-25-0172-00-6a document submitted by Hernandez, Kohno, Anzai, Kobayashi, and Joo. Learn about data rates, frame structuring, time slots, and more relevant aspects in this informative content.
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March 2025 Doc: IEEE P802.15-25-0172-00-6a Project: P802.15 Working Group for Wireless Specialty Networks Submission Title: PHY frame and MAC superframe parameters Date Submitted: March 27th, 2025 Source: Marco Hernandez1,3; Ryuji Kohno1,2; Daisuke Anzai4; Takumi Kobayashi4; Seong-Soon Joo5; Company: (1YRP-IAI, 2-YNU Japan,3CWC Univ. of Oulu, Finland, 4NiTech Japan, 5NHT, Korea) Address: 3-4 Hikarino-oka, Yokosuka, 239-0847, Japan. E-Mail: Marco.Hernandez@ieee.org; kohno@ynu.ac.jp; Kobayashi-Takumi-ch@ynu.ac.jp; ssjoo@etri.sci.kr Purpose: In response to the call for technical contributions. Notice: This document has been prepared to assist P802.15.6ma. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.6ma. Submission Slide 1 Hernandez, Kohno, Anzai, Kobayashi, Joo
March 2025 Doc: IEEE P802.15-25-0172-00-6a UWB modulation and data rates For interoperability, 15.6ma employs the 15.4ab IR-UWB modulation for the 62.4 Mb/s data rate (uncoded) at 499.2 MHz pulse rate. Tchip Tburst Tguard Tburst Tguard Tsymb Tchip= 2 ns; Tburst= 4 ns; Tsymb= 16.025 ns. The colored block with duration Tchiprepresents the time window for an IR-UWB pulse transmission Submission Slide 2 Hernandez, Kohno, Anzai, Kobayashi, Joo
March 2025 Doc: IEEE P802.15-25-0172-00-6a MAC frame dimensioning The MSDU encapsulates the data from an upper layer to the MAC- SAP. The MAC service adds a MAC Header and trailer (FCS) to form the MPDU. MSDU=MPDU payload or MAC frame body. The MAC superframe is divided into time slots Easy transition between CFP (requires GTS) and CAP (slotted Aloha). It enables the CFP and CAP to change dynamically. An upper layer can allocate a maximum of 1152 bytes of MPDU payload that can be transmitted in a slot time without fragmentation. An application can place 1024 bytes of data with 128 bytes for headers and trailers from upper layers. Submission Slide 3 Hernandez, Kohno, Anzai, Kobayashi, Joo
March 2025 Doc: IEEE P802.15-25-0172-00-6a MAC frame dimensioning ?????=?????????????????? ? ?????? CFP ???? 1152 ? 8 bits ? 8 slots ????= =1181.53 ?? 62.4 Mb/s CAP TCFP +TCAP = 4135.53 s Tslot=147.69 s ; TCFP = 1181.53 s for 8 GTS TCAP = 20 Tslot= 2955.38 s for 20 time slots Submission Slide 4 Hernandez, Kohno, Anzai, Kobayashi, Joo
March 2025 Doc: IEEE P802.15-25-0172-00-6a Beacon Interval During the CAP, there is the possibility that a transmission is not accomplished at the end of the CAP (busy medium). Hence, the current transmission will overlap with the next beacon transmission if the inactive period is not long enough. Besides, the device using the channel at the end of the CAP is supposed to be inactive. An alternative is not to define an inactive period per se. If a device is not used or decides to save power it goes to an inactive state, indicating that action to the coordinator. If the coordinator requires such a device to be active, it will indicate that in a beacon (the device only wakes up to listen to beacons) Consequently, the inactive period is not required. Beacon CFP CAP TBI Submission Slide 5 Hernandez, Kohno, Anzai, Kobayashi, Joo
March 2025 Doc: IEEE P802.15-25-0172-00-6a Beacon Interval Dimensioning the Beacon Interval (BI) based on practical implementations, where the basic unit of time is 1024 s. Hence, the BI can be multiples of 1024 s: Beacon Time Unit (BTU)=1024 s Target Beacon Interval (TBI)=N BTU Example: TBI=100 BTU = 102,400 s Beacon CFP CAP TBI It enables the CFP and CAP to change dynamically by the coordinator, indicating the number of time slots for CFP and/or CAP within N BTU. It gives flexibility for coexistence with other BANs. Submission Slide 6 Hernandez, Kohno, Anzai, Kobayashi, Joo
March 2025 Doc: IEEE P802.15-25-0172-00-6a Dynamic CFP and CAP It enables the CFP and CAP to change dynamically by the coordinator, indicating the number of time slots for CFP and/or CAP within N BTU. TCFP TCAP ... ... Tslot TBI TCFP =PTslot; TCAP =QTslot Submission Slide 7 Hernandez, Kohno, Anzai, Kobayashi, Joo
March 2025 Doc: IEEE P802.15-25-0172-00-6a Procedure when collision with beacon The TBI may not occur exactly at N BTU. If the wireless medium is available at the TBI, the beacon will be transmitted. Otherwise, if the medium is busy, the beacon is given high priority after the current transmission. TBI TBI Busy medium Beacon Submission Slide 8 Hernandez, Kohno, Anzai, Kobayashi, Joo
