| 1. |
- Hoang, Hoai, et al.
(författare)
-
Switched real-time Ethernet in industrial applications - deadline partitioning
- 2003
-
Ingår i: APCC2003. - Piscataway, N.J. : IEEE. - 0780381149 ; , s. 76-81
-
Konferensbidrag (refereegranskat)abstract
- This paper presents work on a switched Ethernet network extended to allow for periodic real-time traffic, using earliest deadline first (EDF) scheduling. A scheme of asymmetrically dividing deadlines of real-time channels between the in and outgoing links to/from the switch is proposed (ADPS). The scheme is compared with the simpler approach of dividing the deadlines in two (SDPS). The results of several software simulations of setting up RT channels over a full-duplex switched Ethernet network are presented. The simulations show that the ADPS performs better than the SDPS when master-slave communication is assumed over the network.
|
|
| 2. |
- Holmberg, Torgny, et al.
(författare)
-
Fair scheduling of uplink traffic in HiperAccess
- 2003
-
Ingår i: 9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732). - 0780381149 ; , s. 1198-1204
-
Konferensbidrag (refereegranskat)abstract
- In HiperAccess, the scheduling problem takes two forms; firstly, the base station reserves capacity on the uplink for the different terminals, and secondly, the terminals schedule their respective traffic in its assigned share of the channel capacity. Further, the base station generally has less and older information than the terminals, hence, the base station and the terminals may act differently for a given scenario. In view of this, scheduling traffic with quality of service (QoS) demands can be very difficult. In this paper, we propose a terminal scheduler capable of serving real-time and best-effort traffic with demands on QoS. Further, a new measure of fairness which is well suited for time-slotted systems is proposed
|
|
| 3. |
- Persson, Henrik, et al.
(författare)
-
Maintaining QoS by utilizing hierarchical wireless systems
- 2003
-
Ingår i: 9th Asia-Pacific Conference on Communications (IEEE Cat. No.03EX732). - 0780381149 ; , s. 292-296
-
Konferensbidrag (refereegranskat)abstract
- Future wireless networks, the systems beyond 3G, will be a combination of different wireless systems. With only one terminal a user should be able to connect to different type of operators, technologies and systems. The issue is also to make the terminal staying online connected, when these changes are made. Both intrasystem handovers and intersystem handovers should be supported by such terminals. The systems will form a hierarchical cell structure, that offer the users several technologies and different type of QoS-levels and bandwidths. To analyze this type of hierarchical cell structure a model has been created, and to verify the model calculations on a Markov-chain have been made. Using the transition probabilities we have calculated the state probabilities, to verify the results from the simulations made of our model. The analytical model and the simulation shows a very good agreement. The results show that the model could be used to show how the WLAN usage will behave as the number of WLANs and WLAN users increase
|
|
