Abstract
Telecommunications networks are composed of functional layers acting in cascade. Quality of Service (QoS) derives from the action of each layer that must assure a specific level of quality to the upper layer in terms of performance parameters (e.g., loss, delay, jitter of the packets). Appropriate algorithms are needed to compute the bandwidth necessary so to assure the requested QoS when information is transferred from one layer to the next one below. This paper proposes a scheme that adapts the bandwidth to be allocated to a buffer which conveys heterogeneous traffic (both concerning traffic sources and QoS requirements) in a layer-in-cascade model. The proposal is focused on delay constraints. The proposed algorithm is based only on measures and does not use closed-form expressions, a priori information about traffic statistical properties, and assumptions about buffer dimension. Simulation results show the reliability of the approach in comparison with other techniques at the state of the art, thus corroborating the application of the algorithm for a large set of operative situations, including fading conditions.
Highlights
Modern telecommunication networks are composed of devices which act through layered protocol stacks
This paper proposes a scheme that adapts the bandwidth to be allocated to a buffer which conveys heterogeneous traffic in a layer-in-cascade model
The original protocol architecture has been proposed by ETSI [3] for the access points to a Broadband Satellite Multimedia (BSM) network portion and specified in [4–6]
Summary
Modern telecommunication networks are composed of devices which act through layered protocol stacks. EURASIP Journal on Wireless Communications and Networking medium (UMTS) to another one (WiFi), the IP (TI) layer should be practically unaware of the underlying technology change and no QoS degradation should be experienced during the change. In this generalized framework, it is important to get a model to describe the action of each layer. The queue model allows describing the problems of vertical QoS mapping and to formally introduce a bandwidth allocation adaptation scheme called RCBC (Reference Chaser Bandwidth Control), whose aim is to dynamically adapt the bandwidth at layer 2 so that TD layers can provide a given service in terms of delay to TI layers.
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