CoR-MAC: Contention over Reservation MAC Protocol for Time-Critical Services in Wireless Body Area Sensor Networks

Area of Science:

• Wireless communication networks
• Biomedical engineering
• Computer science

Background:

• Wireless Body Area Sensor Networks (WBASNs) require efficient handling of urgent data.
• Existing reservation schemes can negatively impact channel utilization.
• Time-critical services demand guaranteed deadline adherence.

Purpose of the Study:

• To propose a novel channel access scheme, Contention over Reservation MAC (CoR-MAC), for WBASNs.
• To enhance channel utilization and minimize data delay for time-critical services.
• To evaluate CoR-MAC's performance against established standards like IEEE 802.15.4 and IEEE 802.15.6.

Main Methods:

• Introduction of the CoR-MAC protocol utilizing dual reservation.
• Allowing contention-based access to vacant reserved time slots.
• Performance evaluation through simulation and comparison with IEEE 802.15.4 and IEEE 802.15.6.

Main Results:

• CoR-MAC demonstrates significant performance improvements.
• Reductions in delay for urgent and time-critical data ranged from 50% to 850%.
• Performance gains are dependent on the number of network nodes.

Conclusions:

• CoR-MAC effectively balances the need for urgent data delivery with efficient channel utilization.
• The proposed protocol offers a superior alternative for time-critical services in WBASNs.
• CoR-MAC enhances overall network performance by optimizing resource allocation.