Multiple access protocols for data communications via VSAT networks

Wolejsza, C. J.; Taylor, D.P.; Grossman, M.; Osborne, William P.

doi:10.1109/mcom.1987.1093648

Cited by 16 publications

(3 citation statements)

References 30 publications

(23 reference statements)

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“…In this approach, data is carried in contention mode on the channel as in S-Aloha with a variation that all packets are acknowledged by the recipient. This scheme has been also referred to as random access TDMA 5 . In terms of capacity performance, it is similar to S-Aloha but suffers from the twice propagation delay before the acknowledgment is received by the sender.…”

Section: Slotted Aloha With Acknowledgmentmentioning

confidence: 99%

Self managed Access Scheme for Demand Request in TDM TDMA Star Topology Network

Saini

Sharma

2019

Def. Sc. Jl.

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In demand assignment protocol, resources are granted on the basis of demand, governing some rules, policies in resource assignment and after the completion of need, resources are released back to the central pool for further requests. In star topology TDM/TDMA network of VSATs, large number of participating terminals generate signaling packet on common demand request channel. It is desired that these signaling terminals to have higher chances of successful access to the media and at the same time with minimal number of collision over the shared channel. Under these circumstances, performance of media access protocol is really crucial. Aloha is the simplistic technique to access the shared channel but suffers from extremely low throughput. Its immediate successor slotted Aloha improves the throughput by cutting down the vulnerable period to half by agreeing on transmission at slot boundaries. This improvement is also not adequate to provide the better chances of packets getting through when multiple nodes are participating. The large latency network where one hop delay is of the order of 270ms, feedback time and timeouts are also of high order this further worsen the problem. In this paper, we propose self-managed access scheme for demand request that tries to reduce the collision by managing the multiple requests and distributing them over different slots.

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Section: Slotted Aloha With Acknowledgmentmentioning

confidence: 99%

Self managed Access Scheme for Demand Request in TDM TDMA Star Topology Network

Saini

Sharma

2019

Def. Sc. Jl.

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“…As mentioned in the introduction, during the 1980s and 1990s, numerous multiple access protocols were developed . They are all based on combinations of RA (unslotted or slotted) with fixed‐allocation TDMA, demand‐assigned TDMA, or CDMA.…”

Section: The Satellite Multiple Access Problem and Initial Random Accmentioning

confidence: 99%

“…The available inbound bandwidth resources are shared employing FDMA, TDMA, MF‐TDMA, or CDMA . As opposed to the purely fixed assignment multiple access techniques, the protocols in combined DA, RA, and fixed assignment to dynamically control the access to the shared resources by the large population of contending users. These protocols typically have a centralized control located in the hub, which manages the access to the satellite resources, as it allows a more efficient multiplexing of services with different priorities (e.g.…”

Section: The Satellite Multiple Access Problem and Initial Random Accmentioning

confidence: 99%

Random access schemes for satellite networks, from VSAT to M2M: a survey

Gaudenzi

Herrero

Gallinaro

et al. 2016

Satell Commun Network

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Summary In this survey paper, we review the random access (RA) techniques with particular emphasis on the issues and the possible solutions applicable to satellite networks. RA dates back to the 1970s when the ALOHA protocol was developed to solve the problem of interconnecting university computers located in different Hawaiian islands. Since then, several evolutions of the ALOHA protocol have been developed. In particular, solutions were devised to mitigate the problem of packet collisions severely degrading the RA protocols performance. The approach followed for many years has been to avoid the occurrence of collisions rather than solving them. More recently, techniques tackling the RA packet collision problem have appeared triggered by the need of improving RA performance in satellite and terrestrial wireless networks. In particular, satellite networks large propagation delay does not allow the adoption of enhanced terrestrial RA techniques based on channel sensing. Adopting conventional demand assignment multiple access protocols is not suitable for supporting a large number of sensors or devices transmitting small‐size low duty cycle packets as required for machine‐to‐machine communications. This provided the stimulus to exploit successive interference cancelation schemes to solve packet collision issues. The use of successive interference cancelation in RA is relatively new and has opened up a promising research area. We provide an extensive review of recent high‐performance RA techniques achieving more than three orders of magnitude throughput increase compared with the original ALOHA at low packet loss rate. In this survey, we cover both slotted and unslotted techniques. Finally, we review the use of RA in satellite systems and related standards including recent proposals for machine‐to‐machine applications. Copyright © 2016 John Wiley & Sons, Ltd.

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A new access scheme for pure aloha using capture effect by time‐varying power control

Mutsuura

Okada

Tezuka

et al. 1990

Electron. Comm. Jpn. Pt. I

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The advent of VSAT (very small aperture terminal) has made it possible to consider a new utilization of satellite communication. This paper proposes a new access protocol v‐ALOHA, which is matched to the characteristics of the packet switching network based on VSAT. p‐ALOHA is used as a means to cope with the requirement for simplification. To complement its disadvantage of low through‐put, a new control scheme is combined based on the new utilization. The performance is improved by the capture effect. The basic idea of the control scheme is to vary the power with time while transmitting packets. The difference in the transmission‐start time is converted into the power difference and produces the capture effect, thereby improving the performance. Thus, an access protocol is realized which improves the low throughput of p‐ALOHA while preserving its simplicity. This paper describes the basic idea of this v‐ALOHA and the protocol structure, indicating qualitatively its features. Then the throughput performance is formulated through a quantitative analysis. It is shown from the numerical results for the fixed‐length packet that the performance of the proposed scheme is better than other capture schemes, approaching sufficiently the performance of s‐ALOHA. For the case of the variable‐length packet, there is no slot loss as in s‐ALOHA, and the proposed scheme is shown, using an example, to be better sometimes than s‐ALOHA.

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Multiple access protocols for data communications via VSAT networks

Cited by 16 publications

References 30 publications

Self managed Access Scheme for Demand Request in TDM TDMA Star Topology Network

Self managed Access Scheme for Demand Request in TDM TDMA Star Topology Network

Random access schemes for satellite networks, from VSAT to M2M: a survey

A new access scheme for pure aloha using capture effect by time‐varying power control

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