By Maode Ma
Targeting a massive and complex subject in instant community layout, instant caliber of provider: recommendations, criteria, and functions systematically addresses the quality-of-service (QoS) concerns present in many sorts of renowned instant networks. In each one bankruptcy, the ebook offers a number of QoS demanding situations encountered in real-world functions and delineates how you can triumph over those stumbling blocks. a few of the demanding situations explored are functionality impairments in WLAN hotspots, video streaming functions, and broadband instant entry. The concepts and mechanisms lined to take on those difficulties comprise medium entry and make contact with admission keep watch over recommendations, a parameter tuning set of rules, the QoS-enabling positive factors of IEEE 802.11e, a Markov chain version, a probe-based disbursed admission keep an eye on mechanism, topology-transparent scheduling protocols, and a unique multicast congestion keep watch over mechanism. Addressing complicated subject matters and destiny instructions, the specialist members recognize the necessity for extra learn to unravel a number of open concerns. meanwhile, they provide cutting edge recommendations to resolve present QoS difficulties.
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Extra info for Wireless Quality of Service: Techniques, Standards, and Applications (Wireless Networks and Mobile Communications)
In case the sender does not receive the ACK frame, it starts the retransmission procedure. After discarding or successfully transmitting a packet, if more packets are ready to be transmitted, the node starts the transmission procedure again. Otherwise, it waits for a new packet from the network layer. Another EDCA feature is the use of different ACK policies (no ACK transmission or ACKs aggregation), which can also be used to improve the system performance, but will not be analyzed here. As an alternative to the BA mechanism, nodes can employ a Request to Send (RTS)/Clear to Send (CTS) protocol to access the channel, so as to reduce the hidden terminal effect.
28] proposed another parameter tuning algorithm that tunes the parameters of each AC according to the load of each flow and the number of STAs contending for the channel (similar ideas are used in Ksentini et al.  and Ma et al. ). 5 Designing a MAC Parameter Tuning Algorithm The goal of the proposed algorithm is to provide the values for the EDCA parameters (which are different for the AP and the STAs) to satisfy both the flow (user) requirements and the system constraints. It is a partially heuristic algorithm, which refers to a rule of thumb for adjusting EDCA parameters, based on the common sense behind the rationale of EDCA dynamics.
This is because the AP has to carry alone the same traffic as all the STAs together, although it has the same probability to access the channel. For elastic throughput this is also true, with the AP being affected by the increment of the number of uplink elastic flows, as well as the saturation of voice packets in the AP queue. indb 32 7/21/08 5:21:24 AM Policy-Based QoS Provision in WLAN Hotspots n 33 (1) providing differentiation between the rigid and elastic flows, and (2) providing throughput fairness between the uplink and downlink.
Wireless Quality of Service: Techniques, Standards, and Applications (Wireless Networks and Mobile Communications) by Maode Ma