June 2012, 2012:199,
Open Access This content is freely available online to anyone, anywhere at any time.
Date: 21 Jun 2012
Admission control policy for adaptive multirate multiservices in cellular systems
Forced termination of connections during handover and blocked connection initiation are annoying from the perspective of multiservice cellular system users. Previous studies have shown that an admission control policy reduces the dropping probability to a much lower level but at the cost of raising the blocking probability to a higher level. As an alternative for reducing both blocking and dropping probabilities, we make use of the Adaptive Multirate (AMR) scheme, which is a well-known real-time streaming coding technique. For an example of AMR technique, a video source is encoded into multiple independent descriptions. A cellular device, depending on its available computing and network resources, joins different descriptions to meet performance requirements. The base layer is received and the enhancement layer(s) are abandoned if the cellular capacity is insufficient for high-quality video. Mobile cellular devices currently obtain basic video quality at a lower frame rate. AMR services can substantially improve the degree of user satisfaction and guarantee the connection-level quality of service (QoS) for different multimedia. In cellular systems, the QoS requirements of different services require a connection admission control (CAC) that limits the number of connections in each access network. Therefore, we focus on the CAC and connection-level QoS of multiservice traffic using adaptive coding in mobile cellular systems. We initially analyzed our CAC policy in a multiservices cellular system by formulating the CAC policy functions, arrival rate, departure rate, blocking probability, and dropping probability of the multiservices, before we derived the connection-level QoS and verified it by simulation. The adaptive coding of multiservices traffic has a significant impact on the connection-level QoS in multiservice cellular systems. Our method decreased the blocking and dropping probabilities by adapting multirate services while users were roaming. Mobile cellular operators providing AMR services could apply our CAC to fulfill the quality requirements of the user experience and also improve the connection-level QoS.
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- Admission control policy for adaptive multirate multiservices in cellular systems
- Open Access
- Available under Open Access This content is freely available online to anyone, anywhere at any time.
EURASIP Journal on Wireless Communications and Networking
- Online Date
- June 2012
- Online ISSN
- Springer International Publishing AG
- Additional Links
- Connection admission control (CAC)
- Mobile cellular systems
- Adaptive coding of multiservices traffic
- Quality of service (QoS)
- Blocking and dropping probabilities
- Industry Sectors