Update on NB Channel Access in Wireless Networks
Explore the latest advancements in NB channel access for wireless networks, focusing on ETSI updates and NB CCA procedures. Understand the concept of occupied and unoccupied NB channels, along with NBE channel access requirements. Stay informed about high duty cycle challenges and pending items in ETSI.
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November 2024 doc.: IEEE 15-24-0595-02-04ab Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: ETSI 303687 Update on NB Channel Access Source: Carlos Aldana (Meta), Guoqing Li (Meta), Davide Magrin (Meta), Kumail Haider (Meta) Address : [1 Hacker Way, Menlo Park, CA 94025] E-Mail: [caldana, guoqingli, davidmagrin, haiderkumail (at) meta.com] Re: Study Group 4ab: UWB Next Generation Abstract: [This provides review of ETSI progress related to NB Coex] Purpose: [For information] Notice: This document has been prepared to assist the IEEE P802.15. 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. Carlos Aldana, et. al
November 2024 doc.: IEEE 15-24-0595-02-04ab Latest BT-SIG Proposal in BRAN(24)126018 4.3.6.3.5.2 An NB CCA detects the presence of other transmissions. An NB CCA shall have a duration of not less than 18 s. An NB channel is an occupied NB channel as long as transmissions in that NB channel are present at a power level greater than the ED Threshold (EDT) in clause 4.3.6.3.6. The power level is determined by integrating the received power over the NB channel, and then normalizing to per MHz power. The received power shall be measured at the interface between the equipment and the antenna assembly. If no transmissions are present at a power level greater than the EDT, the NB channel is an unoccupied NB channel. If the NB channel is an occupied NB channel, the NBE shall not transmit on the NB channel. Transmissions may start on an unoccupied NB channel and shall start immediately upon a completed NB CCA. 4.3.6.3.5.3 NBE Channel Access NBE shall perform an NB CCA before transmitting on an NB channel, except when the gap to a prior transmission or reception on the same NB channel is less than 18 s. If an NB CCA indicates an occupied NB channel, NBE may perform a new NB CCA on another NB channel after at least 50 s or on the same NB channel after at least 100 s. NBE shall leave a 100 s or longer idle gap at least every 10 ms. TBD, placeholder to possibly address 'multiple high duty cycle NBEs' topic. Narrowband (NB) Clear Channel Assessment (CCA) NOTE: This was submitted for Discussion Carlos Aldana, et. al Slide 2
November 2024 doc.: IEEE 15-24-0595-02-04ab Informative Block Diagram Carlos Aldana, et. al Slide 3
November 2024 doc.: IEEE 15-24-0595-02-04ab Informative State Diagram Perform CCA Y N Is CCA Idle? N Success Y Switch Channel? Delay 100us Delay 50us Carlos Aldana, et. al Slide 4
November 2024 doc.: IEEE 15-24-0595-02-04ab Pending Items in ETSI EDT High duty cycle NB preventing WB channel access 11-24-1150-01 from Menzo (QC) 11-24-1138-00 from Sebastian (Ericsson) Carlos Aldana, et. al Slide 5
November 2024 doc.: IEEE 15-24-0595-02-04ab Potential ways forward 2 options Accept Document 15-24-407 as is Document 15-24-407 (coauthored by individuals from Qualcomm, Mediatek, Calterah, Cisco, Intel, HPE, Amazon, and Meta) that addresses CID 988 is revised at the January 2025 meeting to reflect ETSI BRAN #127 (December 2024) agreements. Carlos Aldana, et. al Slide 6
