Adaptive control mechanism for cable modem MAC protocols

Sala, Dolors; Limb, J.O.; Khaunte, Sunil Upendra

doi:10.1109/infcom.1998.662956

Cited by 21 publications

(12 citation statements)

References 8 publications

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“…While assumptions made by the authors (such as high loss rates in the upstream path) are no longer true, our recent results do confirm that DOCSIS induces ACK compression. Other early studies looked at TCP enhancements when operating over HFC networks suffering from high channel error rates or high collision rates due to heavy workloads [2,17,18].…”

Section: Related Workmentioning

confidence: 99%

A Simulation Model of the DOCSIS Protocol

Martin

Westall

2007

SIMULATION

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The number of households and businesses using hybrid fiber coaxial cable networks for Internet access is rapidly approaching 40 million in the United States. The cable industry has standardized on a single medium access control (MAC) and physical layer standard, the Data Over Cable Service Interface Specification (DOCSIS). The MAC layer of the emerging IEEE 802.16 broadband wireless access standard is also based upon DOCSIS. Thus, the performance of DOCSIS is now and will remain a critical element in the overall performance of shared medium broadband access networks. Despite this fact, public domain tools that may be used to assess and improve the performance of DOCSIS have been slow to emerge. To address this problem, we have implemented a simulation model of the DOCSIS MAC layer for the 'ns' network simulation tool. Due to the complexity of DOC-SIS and because the specifications are purposely incomplete, developing an accurate simulation is quite challenging. In this paper we present analytic and live network evidence that the simulation accurately reflects the behavior of a DOCSIS network under a limited set of workloads.

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Section: Related Workmentioning

confidence: 99%

A Simulation Model of the DOCSIS Protocol

Martin

Westall

2007

SIMULATION

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“…No change in hardware or standards should be made and the operation of the network should be entirely controlled by the BS/HE [1,5]. II.…”

Section: Previous Workmentioning

confidence: 99%

“…II. The channel information should be continuously fed back to the BS/HE and used for adapting the network conditions [1,5]. III.…”

Section: Previous Workmentioning

confidence: 99%

“…III. The overall channel bandwidth should be dynamically and optimally distributed between the contention and reservation slots and among the regions/groups of the channel [1,5]. The proposed protocol not only allows fast and fair access to the network to most users but also implicitly addresses proposals requiring the network to offer bandwidth and delay guarantees to possible access/service requests and flows generated by these services [1,6].…”

Section: Previous Workmentioning

confidence: 99%

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A novel 4G MAC protocol guaranteeing high QoS and capacity in CBR communications networks by continuous group divisions and resource re-allocations to considerably reduce contention mini-slot collisions

Kamal

2007

Proceedings 2007 IEEE SoutheastCon

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We previously showed that high QoS and capacity in CBR communications networks can be achieved by the user-group-division method.The novel MAC protocol based on this method and fundamental theories and postulates (supported by the CBR network environment) required to develop the protocol are presented here. No change in hardware or standards is required to implement this protocol and the protocol can be executed on the mobile stations (ms) or cable modems (cm) from the Base Station (BS) or Head-End (HE).Initially, the protocol divides up the network into groups formed by one contention mini-slot (cms) per region and a group of users (with the group size equals the avg. number of users per cms in the network) allocated to that particular cms. Afterwards, the cms bandwidth is re-allocated interregionally (regrouped) and the total channel bandwidth is re-distributed between the cms and ds (data slot) based on the feedback received on the collision and available resource (bandwidth) conditions of the network during the previous round-trip time (rtt). The protocol is executed in the network at each rtt by running the feedback mechanism, regrouping, and re-distributing the bandwidth.The advanced network simulator (ANS-1) written in MATLAB using my novel abstractions and the novel Nasrin traffic generation and distribution model are used to evaluate the protocol in a flexible and reliable network simulation environment. The results showed high fair utilization and low waste of the required cms and data bandwidth with high collision reduction. The proposed approach accomplishes a record 80% cms collision reduction and 85% cms and 100% data bandwidth utilization (guaranteeing high QoS and capacity) while providing high controllability to the BS/HE for reducing the probability of collisions. The protocol achieves these improvements by distributing the cms to small groups of users (reducing the probabilities of uncontrollable and high collisions), repeating its execution (thinning the accumulation and repetitions of collisions), and managing the ds and cms resource requirements with feedback to allocate the resources to the needy regions (reducing the probabilities of buildup and recurrences of collisions).

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“…In Sala et al [11] the flexible boundary model has been investigated through simulation, which shows that inducing arrival slots at the beginning of each frame might positively influence the system's performance. It is therefore that we investigate the same kind of strategy.…”

Section: Introductionmentioning

confidence: 99%

A discrete-time queueing model with periodically scheduled arrival and departure slots

Leeuwaarden¹,

Denteneer

Resing

2006

Performance Evaluation

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We consider a time-slotted queueing model where each time slot can either be an arrival slot, in which new packets arrive, or a departure slot, in which packets are transmitted and hence depart from the queue. The slot scheduling strategy we consider describes periodically, and for a fixed number of time slots, which slots are arrival and departure slots. We consider a static and a dynamic strategy. For both strategies, we obtain expressions for the probability generating function of the steady-state queue length and the packet delay. The model is motivated by cable-access networks, which are often regulated by a request-grant procedure in which actual data transmission is preceded by a reservation procedure. Time slots can then either be used for reservation or for data transmission.

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Adaptive control mechanism for cable modem MAC protocols

Cited by 21 publications

References 8 publications

A Simulation Model of the DOCSIS Protocol

A Simulation Model of the DOCSIS Protocol

A novel 4G MAC protocol guaranteeing high QoS and capacity in CBR communications networks by continuous group divisions and resource re-allocations to considerably reduce contention mini-slot collisions

A discrete-time queueing model with periodically scheduled arrival and departure slots

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