High Speed Mobile Access for Wireless LANs

Responsible:

Siemens AG Communications (Com MN PG NT RI 4 - Future Radio) z. Hd. Dr. Martin Weckerle St.-Martin-Str. 76 81541 München

Approach:

The goal of the sub-project “High Speed Mobile Access for Wireless LANs” is to contribute to the specification of a Gbit/s WLAN indoor/outdoor public access mode of the overall WIGWAM system concept that operates in the 5 GHz frequency band. High speed access will be provided in large hot spot areas, e.g. in the whole city center, with mobility support but without the intention to have necessarily full coverage. Coverage extension can be achieved by considering multihop communication and/or cellular like extensions, i.e. by the use of several access points within the hotspot area, where the coverage areas of the different access point might not overlap. Additionally, existing overlay networks, e.g. UMTS, can be exploited to support routing and radio resource management and the organization of medium access in multihop communication.

In order to achieve this overall goal, the main focus of this sub-project is on the development and investigation of flexible and adaptive transmission schemes and efficient medium access concepts that enable the envisaged high data rates and the mobility support. It is expected that the data rate is scalable and will be adaptively reduced by increasing the velocity of the mobile users in a self-organizing manner. Due to the restriction of the bandwidth to the maximum of 100 MHz, adaptation strategies of the transmission regarding the modulation, coding and the flexible exploitation of multi-antenna systems will be developed in order to achieve the required high spectral efficiency. In order to enable the required high throughput a flexible Gbit/s MAC protocol, efficient RLC protocols and ARQ mechanisms have to be developed. All these concepts together with a suitable network topology will lead to a public access Gbit/s WLAN system that can operate either as a stand alone system or as an integral part of a future beyond 3G mobile radio communication system.

In detail, the following tasks and research topics are envisaged:

·        Design and specification of access and transmission schemes

·        Concepts for channel monitoring and prediction

·        Efficient FEC concepts and joint optimization of coding and modulation

·        Adaptive scheduling and cross layer design

·        Single user and multiuser MIMO concepts for frequency selective channels

·        Develop and investigate adaptation concepts for MIMO-OFDM systems

·        Concepts for interference reduction in MIMO multiuser scenarios

·        ARQ concepts with incremental redundancy that enables a high throughput

·        Development of efficient RLC protocols that must be optimized regarding latency and throughput

·        MAC structure that guarantees QoS and supports MIMO and multihop communications

·        Concepts to exploit overlay networks including gathering and distributing information via overlay networks