Jens Mueckenheim

Radio resource management in HSDPA and HSUPA

This paper discusses the interaction between high speed downlink packet access (HSDPA) and high speed uplink packet access (HSUPA) scheduling algorithms running in the Node B and other resource management algorithms in the radio network controller (RNC), which are still required to satisfy user-perceived quality. We investigate the effect of load sharing with legacy dedicated channel transmission, and discuss load control algorithms suitable for HSDPA and HSUPA packet transmission. The main concepts of resource allocation are discussed together with results obtained from a dynamic system simulator developed by Alcatel-Lucent.

Intelligent management of radio resources in UMTS access networks

The efficient management of scarce radio resources is the heart of any mobile communication system. By the means of power control, load control, and handover, any cellular system can be kept in a stable operational state for all traffic and radio environment conditions. This control mechanism is called radio resource management (RRM). Essentially, RRM algorithms affect the mobile system performance and provide service quality. Therefore, RRM efficiency is a major differentiating factor with regard to the radio access network realizations, especially as the algorithms typically are not standardized. Lucent Technologies has conducted extensive studies to verify the design, evaluate the performance, and prove the excellence of the realized algorithms in the Universal Mobile Telecommunications System (UMTS) access network. This paper describes the theoretical background of WCDMA/UMTS system performance evaluations and shows how this knowledge was turned into a flexible simulation tool. This tool can handle dynamic effects of RRM algorithms in cellular network models by incorporating realistic radio propagation with moving mobile stations generating a mixture of voice and data traffic. The paper further provides examples from a huge series of studies investigating the dynamics of code division multiple access (CDMA) radio systems. These studies and Lucents long experience with developing, deploying, and optimizing CDMA networks will contribute to shortening the introduction phase of the new UMTS radio network technology.

Time/wavelength coding for diffuse infrared communication systems with multiple optical carriers

We propose two possibilities to combine multiple optical wavelengths with code division multiple access (CDMA) to achieve asynchronous access in diffuse IR-systems. A serial coding type which combines D-ary wavelength-shift keying with incoherent CDMA and a parallel coding type where the channels are distinguished by time/wavelength-matrices are investigated. We analyze the theoretical performance and show numerical results for different code families.

Support of mobile TV over an HSPA network

This paper describes a quality of service (QoS) implementation in the UMTS Terrestrial Radio Access Network (UTRAN) to commercialize mobile television (TV) services with current High Speed Packet Access (HSPA) commercial devices, which do not support a streaming traffic class as defined by the 3rd Generation Partnership Project (3GPP). This implementation allows the mobile operators to offer a high quality of service for the end user in terms of reducing the need for re-buffering during the mobile TV session, while minimizing the impact of the service on the overall radio cell capacity. System level simulations relying on a Tier 1 operator use case have been generated to quantify the benefits streaming users experience due to this QoS implementation in the presence of background traffic in the same radio cell. The impact in terms of radio cell capacity is also evaluated.