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Modeling and contro...
Abstract
Ämnesord
Stäng
- A fundamental assumption of the TCP protocol is that packet losses indicate congestion on the network. This is a problem when using TCP over wireless links, because a noisy radio transmission may erroneously indicate congestion and thereby reduce the TCP sending rate. Two partial solutions, which improve the quality of the radio link, are power control and link-layer retransmissions. We consider a radio channel with multiple users and traffic classes, and investigate how parameters in the radio model influences TCP-related quality measures, such as the average delay and the probability of spurious timeout. The results indicate that the outer loop power control is robust to uncertainties in the radio model. This robustness property supports separation between the radio layer design and the IP and TCP layers.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Reglerteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Control Engineering (hsv//eng)
Nyckelord
- ARQ
- Feedback control
- Power control
- TCP
- WCDMA
- Average delay
- Cellular radios
- Modeling and control
- Multiple user
- Outer loop power controls
- Quality measures
- Radio channels
- Radio model
- Retransmissions
- Robustness properties
- Sending rate
- Spurious timeout
- TCP over wireless
- TCP protocol
- Traffic class
- Automation
- Control
- Radio broadcasting
- Radio links
- Robust control
- Transmission control protocol
- Radio transmission
Publikations- och innehållstyp
- ref (ämneskategori)
- kon (ämneskategori)