Delay and Energy Aware RAW Formation Scheme to Support Delay Sensitive M2M Traffic in IEEE 802.11ah Networks

Charania, Navroz (2017) Delay and Energy Aware RAW Formation Scheme to Support Delay Sensitive M2M Traffic in IEEE 802.11ah Networks. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

In order to support the features of M2M communication, IEEE 802.11 has modified the PHY and MAC layers in `ah' amendment. IEEE 802.11ah is designed to support up to 8K M2M devices over the Sub-GHz channel. For supporting a large number of such devices it has made significant changes in the MAC layer by adding the restricted access mechanism. The devices are grouped and are alloted a time interval, in which data transmissions happen, called the Restricted Access Window (RAW). Devices make uplink transmissions only during their alloted RAW intervals by following CSMA/CA and sleep rest of the time. The RAW structure can be altered and this information can be passed on to the devices in every beacon interval. Certain devices contending for uplink may have some delay and energy constraints (DSMDs: Delay Sensitive Machine type Devices) as compared to other regular devices (non-DSMDs: non Delay Sensitive Machine type Devices). Such DSMDs will have to contend for resources in the same manner as non-DSMDs, which may result in failure to meet the above constraints. In order to address this issue, we propose the Delay and Energy Aware RAW Formation (DEARF) scheme, in which we introduce four new type of RAW structures by exploiting their dynamic nature. These are Contention Indication (CI) RAW, Delay Information Indication (DII) RAW, DSMDs Resource Allocation (DRA) RAW and non-DSMDs Resource Allocation (NRA) RAW. Among these four RAWs, first three are exclusively used by the DSMDs while the fourth RAW is used by non-DSMDs where they follow the basic IEEE 802.11ah access mechanism. For accessing, firstly DSMDs need to announce that they have something to send in the contention based CI RAW. Then, they communicate their delay requirements by sending required information in the contention free DII RAW. Finally, they send their uplink data in the contention free DRA RAW.

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