September 2018 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Discussion on MAC structure Date Submitted: September 11th, 2018 Source: Nikola Serafimovski, Chong Han (pureLiFi) Address: 9 Haymarket Terrace, Edinburgh, UK, EH12 5EZ Mobile:[+44-7503016565], E-Mail:[chong.han@purelifi.com] Re: Abstract: This document provides the MAC structure Purpose: Assist discussion on MAC functionalities 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. Chong Han (pureLiFi)

A few questions asked before proposal September 2018 A few questions asked before proposal For discussion Is CSMA/CA working in OWC? How do we define ‘carrier sensing’ and ‘CCA’ in the term of OWC? Need comprehensive introduction to the mechanism. How well can the CSMA/CA perform in terms of scalability? Need proof in terms of simulation results. Polling can be deemed as either contention based or contention free. In other words, it has both contention-based and contention-free periods. However, the two periods/intervals shall work together and keep the intervals contiguous, since the coordinator may make decisions based on outcome from the previous random access period in the polling period. Polling itself has both scheduled and contention-based transmissions. Is it necessary to keep another working random access mechanism (e.g., 5.1.2.1) in the same standard? Chong Han (pureLiFi)

Proposed MAC structure September 2018 Proposed MAC structure Superframe structure: 5.1.1.1 5.1.2.4 B Polling To start a superframe 5.1.2.4.1 5.1.2.4.2 and 5.1.2.4.3 Random access (association, TX request) Polling (data transmission) B B To start a random access or polling period No superframe structure: 5.1.2.4.1 5.1.2.4.2 and 5.1.2.4.3 5.1.2.4.1 5.1.2.4.2 and 5.1.2.4.3 Random access (association, TX request) Polling (data transmission) Polling (data transmission) B B B Random access B The star topology is considered as the basic topology by polling. Polling consists of two types of periods: Random access for (re)association and transmission request Polling for data exchange Polling does not require a separate Beacon Period, hence it fits in both superframe or non-superframe structure. Chong Han (pureLiFi)

Proposed MAC structure September 2018 Proposed MAC structure Superframe structure: 5.1.1.1 5.1.2.4 B Polling GTS ? To start a superframe 5.1.2.4.1 5.1.2.4.2 and 5.1.2.4.3 Random access (association, TX request) Polling (data transmission) B B To start a random access or polling period 5.1.2.4.1 No superframe structure: 5.1.2.4.2 and 5.1.2.4.3 5.1.2.4.1 5.1.2.4.2 and 5.1.2.4.3 Random access (association, TX request) Polling (data transmission) Polling (data transmission) B B B Random access B The star topology is considered as the basic topology by polling. Polling consists of two types of periods: Random access for (re)association and transmission request Polling for data exchange Polling does not require a separate Beacon Period, hence it fits in both superframe or non-superframe structure. Chong Han (pureLiFi)