Deterministic service guarantees in IEEE 802.12 networks—part I: the single-hub case
IEEE/ACM Transactions on Networking (TON)
Scheduling Algorithms for Multiprogramming in a Hard-Real-Time Environment
Journal of the ACM (JACM)
IEEE 802.12 Demand Priority and Multimedia
NOSSDAV '93 Proceedings of the 4th International Workshop on Network and Operating System Support for Digital Audio and Video
Real-time communication in the demand-priority LAN-the effects on normal priority traffic
LCN '95 Proceedings of the 20th Annual IEEE Conference on Local Computer Networks
100Base-T/IEEE 802.12/packet switching
IEEE Communications Magazine
The Demand Priority MAC protocol
IEEE Network: The Magazine of Global Internetworking
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In IEEE 802.12 network, a repeater arbitrates among transmission requests on a round robin basis. A node can transmit a packet only when it is granted by the repeater. Recently, the IEEE 802.12 Committee approved a burst mode in which a node can transmit multiple packets per grant. In burst mode a bandwidth, or the number of packets per grant should be allocated taking into account the timing constraints of real-time messages. This paper proposes bandwidth allocation algorithms based on the burst mode to guarantee the deadlines of periodic real-time messages. Once the bandwidth of each node is derived from the lengths and deadlines of periodic messages, a node is allowed to transmit packets up to the allocated bandwidth per grant. Experimental results show that the proposed algorithms providemuch higher guarantee ratio and graceful degradation for heavy network load, compared with the existing approaches.