Kanalvergabe und Sendeleistungssteuerung bei HiperLAN-2

The WLAN system HiperLAN/2 (H/2) was standardized by the ETSI project BRAN during the last years. Due to the high data rate (up to 54 Mbit/s on the air interface) and the possibility to support QoS this system fulfills the requirements of mobile users in a multimedia world. H/2 operates in the 5 GHz band which offers indoors 19 and outdoor 9 frequency channels. These frequency channels may be used also by other systems, as for example by IEEE 802.11a, so that the resulting number of channels can be significantly reduced. H/2 offers link adaptation to adjust the modulation and coding scheme according to the interference. This leads to a high dependency between the available capacity and the load in the neighbor cells. Under these circumstances two approaches to deal with the radio resources are developed and evaluated. The first approach distributes the interference uniformly, by reducing the transmission power and selecting a more robust modulation/coding scheme. This reduces the variance of the interference which makes the selection of an appropriate modulation/coding scheme easier. The second approach uses maximum transmission power to reduce the transmission time as much as possible. If a frequency channel is not completely used the remaining time can be assigned to other access points. A method developed in this work allows to multiplex several neighbor access points on the same frequency channel. These approaches are based on a different view of a channel. While the first applies frequency channel (FDM), the second uses FDM/TDM channels. Based on this, different approaches for channel assignment are evaluated and their ability to support service classes is examined. In addition the spectral efficiency of the H/2 of system and its dependence on different parameters is evaluated in this work.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2003

Author dc:creator

• Krämling, Andreas

Contributors dc:contributor

• Walke, Bernhard

• info:eu-repo/classification/ddc/620
• HIPERLAN/2
• Kanalkapazität
• Betriebsmittelverwaltung
• Frequenzbereich
• Übertragungsqualität
• Leistungsbewertung
• Ingenieurwissenschaften

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

ger

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-121115%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:59318