Adaptive coverage for UMTS macrocells based on situation awareness

Abstract

Abstract-The following paper examines the capability of extending basestation sector beams in order to assume coverage in a partially or fully failed neighbouring cell. Increasing the transmit power of the sector to reach out for new users is not possible in UMTS since it increases integerence in the system. This paper considers how adaptive coverage can be implemented in practice. Analysis suggests that pe$ormance is downlink limited. A balanced link power algorithm is required to provide the extra power for increasing the range capability of the sector Furthermore, it is found that up to 25% of users (premium rate customers) in a failed heavily loaded cell can be supported by sector extension. This figure approaches 100% for a lightly loaded cell, or the more practical case of sector failure. In all cases, SA significantly enhances the number of users that can be supported anywhere in the failed cell.

Automated W-CDMA microcellular deployment and coverage reconfiguration based on situation awareness

“…From Table 4, it can be seen that SA restores the network spectrum efficiency to values obtained at deployment except for the 384kbps, which appears extremely sensitive to pathloss. 1 Expected number of subscribers using service per sector …”

“…Adaptive or dynamic networks are now being proposed in order to drive down the cellular infrastructure cost while maintaining QoS in a time varying network. More specifically, Self-Organising techniques have been proposed to achieve dynamic network behaviour [1]. In order to implement SelfOrganisation, previous research has focused on the implementation of 'Situation Awareness' (SA), which represents key enabling functionality [1] [2].…”

“…More specifically, Self-Organising techniques have been proposed to achieve dynamic network behaviour [1]. In order to implement SelfOrganisation, previous research has focused on the implementation of 'Situation Awareness' (SA), which represents key enabling functionality [1] [2]. SA requires basestations to monitor parameters such as pathloss (basestation to basestation and basestation to mobile), with this information shared across the network.…”

“…Adaptive algorithms for macrocells based on the concept of Situation Awareness have already been devised to reconfigure coverage for different scenarios (i.e. the addition or removal of basestations) [1] [2]. These macrocell studies made use of the relatively simple COST 231-propagation model.…”