Showing papers by "Jeroen Wigard published in 2010"

Hybrid home node b

Abstract: There is proposed a mechanism providing functions of a so- called hybrid home node B (HHNB) where subscribers, depending on their belonging to a specific subscriber group, such as a closed subscriber group or an open subscriber group, are admitted for a connection to the communication network via different connection routes and systems. After a request for connecting a subscriber is received, an identification process is performed whether the subscriber belongs to a first subscriber group (CSG) or to a second subscriber group (OSG). On the basis of this identification, the subscriber is assigned to a first connection route or a second connection route. It is then checked whether available resources on the assigned connection route are sufficient, wherein on the basis of this check the request for connecting is allowed or rejected.

Load adaptive power control in LTE Uplink

Abstract: In LTE Uplink, the slow varying pathgain and shadowing are compensated by the standardized open loop power control (OLPC) which is based on a power density offset and a compensating factor for the pathloss experienced by the users. The optimization of those parameters reveals a dependency on the allocated bandwidth. A Load Adaptive Power Control (LAPC) algorithm is proposed to handle the bandwidth variations and ensure optimal system performance. In this contribution it is shown that using closed loop power control commands to adapt the transmission power density to the used bandwidth, it is possible to achieve coverage gains up to 60% while maintaining a cell throughput comparable to the reference case.

A method and apparatus for use in a mobile communications system comprising a relay node

Abstract: A method comprising selecting one of a plurality of communication options, each communication option providing a different division of resources between a first link (10) between at least one relay node (4) and a base station (2) and a second link (12) between said at least one relay node (14) and a plurality of user equipment (16) configured to communicate with said at least one relay node (14); and using said selected communication option to control the division of resources between said first and second links (10,12), wherein said using comprises sending information to a user equipment (16) to control an activity of that user equipment (16) in dependence on said selected communication option

Dynamic Packet Scheduling for Traffic Mixes of Best Effort and VoIP Users in E-UTRAN Downlink

Abstract: This paper deals with packet scheduling for Voiceover-IP (VoIP) traffic in the Long Term Evolution (LTE) EUTRAN Downlink. The more specific target is to optimize the performance of dynamic scheduling for traffic mixes of VoIP and best effort users. To this end, we introduce the Required Activity Detection (RAD) packet scheduling algorithm with Delay Sensitivity (RAD-DS).With an appropriate delay sensitivity function, it is shown that a MACRO 1 cell with 5MHz transmission bandwidth can support up to 346 VoIP users. Furthermore, a novel delay sensitivity based soft prioritizing strategy is proposed for handling traffic mixes. It is shown that when 200 VoIP users are present in a cell along with best effort users, the proposed strategy can provide a cell throughput of up to 82% of the cell throughput with only best effort users.

Uplink Coordinated Multi-Point for LTE-A in the Form of Macro-Scopic Combining

Abstract: For the future LTE-Advanced network, one of the requirements in the uplink (UL) direction is to enhance the celledge user performances. Coordinated multi-point reception in the UL is one of the techniques being investigated to further improve the performance of LTE networks. With the help of the information coordination through the links between the sites and advanced receivers the UL performance can be improved. The simulation results show that, with the ideal interference cancellation, inter-Site maximum ratio combining, and optimized closed-loop and open-loop fractional power control, there are about 27% gains for the 5% outage user throughput and 12% gains for the average user throughput. As shown in this paper, these gains from UL macro-scopic multi-cell combining between sites are achieved for optimized power control, ideal interference cancellation receivers, and X2 with no delay and high bandwidth.

A Site-Specific Study of In-Building Wireless Solutions

Abstract: This paper studies the different ways of extending wireless coverage for high data rates and improving the data capacity in a building. The solutions considered include deployments of single or multiple small base stations, i.e. Picocell or Femtocell, and distributed antenna system, operated on the same frequency as the macro cellular network. We look at the radio performance of each solution in a LTE downlink context with in-building path loss values retrieved from real-life measurements. The performance is compared by means of maximum supportable user numbers and average system throughput. Potential gains by hard frequency reuse in the building and QoS based packet scheduling are examined. Simulation results show the robustness of the proposed distributed antenna system and the conditions for multi-Femtocell deployment.

Increasing Efficiency of Admission Control in a Network

Abstract: An apparatus and a method is provided, by which a penetration of terminals supporting a congestion indication scheme in a network or a part of the network is determined, and a load threshold is dynamically adjusted according to the penetration of terminals supporting a congestion indication scheme, wherein the load threshold is used for controlling load in the network or the part of the network.

Method and apparatus for controlling handover and reselection

Abstract: A method and an apparatus for controlling handover and reselection are provided. The apparatus comprises: a controller configured to obtain information related to the energy consumption of one or more services on one or more systems utilizing different radio access technology; and determine a need for a handover or a reselection for a mobile unit using one or more services on the basis of the information.

Radio Access Parameter Tuning

Abstract: There is provided a solution for performing radio access parameter tuning. The solution comprises obtaining first predetermined characteristics related to users who experienced a radio link failure, obtaining second predetermined characteristics related to the users who are according to a predetermined rule prone to a radio link failure, and determining, based on the obtained second predetermined characteristics in addition to the obtained first predetermined characteristics, whether radio access parameter tuning is to be performed or not.

On the impact of realistic control channel constraints in UTRAN LTE TDD system

Abstract: This paper focuses on the Physical Downlink Control Channel (PDCCH) and describes the impact of its realistic constraints on the performance in E-UTRAN LTE TDD system, particularly considering the asymmetric slot resources between downlink and uplink. It is described, when adopting the same PDCCH manager framework in LTE FDD system as in LTE FDD system, the uplink users are not prioritized sufficiently regarding less uplink subframe under most of TDD UL/DL configurations. Therefore, it is proposed, the joint list in the PDCCH manager framework can be adjusted semi-statically to perfectly match TDD UL/DL configurations, and assuming ideal traffic monitoring this can furthermore provide more freedom and flexibility for wider range of UL/DL service requirement, without changing the overall TDD UL/DL configurations. The simulation results proved that the TDD-oriented PDCCH framework can satisfy UL/DL traffic requirement via exploiting the flexibility of joint list based on semi-statistically monitoring and adjustment.

Methods and apparatus for supporting multiple types of connections to a core network

Abstract: There is proposed a mechanism providing functions of a so-called hybrid home node B (HHNB) where subscribers, depending on their belonging to a specific subscriber group, such as a closed subscriber group or an open subscriber group, are admitted for a connection to the communication network via different connection routes and systems. After a request for connecting a subscriber is received, an identification process is performed whether the subscriber belongs to a first subscriber group (CSG) or to a second subscriber group (OSG). On the basis of this identification, the subscriber is assigned to a first connection route or a second connection route. It is then checked whether available resources on the assigned connection route are sufficient, wherein on the basis of this check the request for connecting is allowed or rejected.