Joint Radio Resource Management for Multi-link Terminals
Authors: Luo, Jijun
Department of Communication Networks (ComNets), Faculty 6, RWTH Aachen University
: Gabi Reimann
Ph. D. Dissertation Aachen University, ABMT 51, p. 176, ISBN:3-86139-930-0,Wissenschaftsverlag Mainz, 2006.
Publication Date: , 2006
On page(s):176
ISBN: 3-86139-930-0
Abstract With the increasing demands for a wireless communication network consisting of multiple air interfaces coexisting in the same operating area; with the increasing demands of multimedia user services and the emerging reconfigurable multi-mode terminal enabled by reconfigurable technologies, advanced Radio Resource Management (RRM) is needed to utilize the available system resource with performance improvement. In this thesis, the Joint Radio Resource Management (JRRM) schemes applicable for multi-standard radio access technologies or a network with multiple frequency layers in a service area are studied. This thesis contributes to the current discussions on 3G evolution w.r.t. increasing bandwidth demand, e.g. 10 MHz for single users [26]. With the introduction of requirements on future radio technologies, Software Defined Radio (SDR) as one important pool of technologies being expected is briefly introduced. The state of the art of the research activities and the functional architecture of SDR system with detailed functioning models are unveiled. The JRRM modules for heterogeneous networks and multi¬ple cell layers are explained. Two basic levels of JRRM approaches, namely Joint Session Admission Control (JOSAC) and Joint Session Scheduling Algorithm (JOSCH) based on one Radio Multi-Homing (RMH) approach (adaptive simultaneous radio links to a terminal) are introduced with necessary performance comparisons based on theoretical models and system level simulations. This thesis includes the following key contributions: Establishment of a general concept of JRRM and a functional architecture model for JRRM: In order to show the goodness of JRRM for interworking subnetworks, capacity gains contributed by JRRM including JOSAC and JOSCH compared to Non JRRM case are analysed based on the newly developed theoretical models. Analyses are carried out based on the traffic management policy (agnostic traffic splitting or policy based traffic-splitting) and the switch¬ing method (circuit switched or packet switched) for various traffic types as HTTP, video, data and voice users. RRM in individual subnetworks: The RRM mechanisms are investigated in the Hiperlan/2 subnetwork and the UMTSIFDD subnetwork respectively. Blocking problems are studied considering two kinds of phenomena, the hard blocking and the soft blocking. The former one is restricted by the available resources of a system, e.g. time slots, spreading codes, spectrum, etc. The latter one is restricted by the actual system load, e.g. interference, total transmission power etc. The principle of optimal resource allocation scheme in an interference limited subnetwork based on UMTS FDD air interface is derived. The resource allocation schemes for typical elastic traffic (HTTP) are also carried out and compared. In addition, approaches to optimally select Modulation and Coding Schemes (MCS) are also studied. Investigations of system capacity gain given by JRRM approaches: It is identified that the performance gains of JRRM are much determined by the traffic management policy. The agnostic traffic splitting controlled by the Radio Resource Controller (RRCR), e.g. an RNC is studied in a two frequency-layer UMTS network. For circuit switched services, a soft admission control algorithm is proposed. For the packet switched services, a novel scheduling algorithm over two frequency layers for HSDPA is proposed. The performances given by JRRM schemes with co-located and separated base stations are also compared. Policy based JRRM deployed in a typical coexisting environment with a UMTS FDD subnetwork and a Hiperlan/2 subnetwork is investigated, whereas, the impact of heterogeneity in terms of deployment patterns for UMTS and H/2 cells on the JRRM functions are elaborated. For the policy based JRRM, involvement of the service proxy/server knowing the service scalability and QoS demand in each scalable level is found out to be beneficial. Furthermore, synchronisation issues including resource reservation, bearer service mapping and a synchronisation concept are discussed. In general, the JRRM approach for multi-link terminals in the heterogeneous networks is of importance to enhance the spectrum efficiency. The trunking gain due to shared radio resources, multiplexing gain due to agnostic traffic split, user perception gain due to service scalability, diversity gain due to redundant radio links and multi-user diversity gain due to scheduling over multiple users are pointed out by the work, whereas the first three items are investigated in detail. As a conclusion, the JRRM algorithms should not only span over subnetworks, but also over management layers and service types. Although most of the investigations covered by the thesis are performed for the downlink in the discussed networks, the same principle and methodologies can also be applied for the uplink with necessary signalling supports.
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@PHDTHESIS{DISS_LUO_2006,
AUTHOR = {Luo, J.},
TITLE = {Joint Radio Resource Management for Multi-link Terminals},
YEAR = {2006},
VOLUME = {51},
PAGES = {176},
PUBLISHER = {Wissenschaftsverlag Mainz},
ADDRESS = {Aachen, Germany},
SCHOOL = {Aachen University},
SERIES = {ABMT},
EDITION = {1},
AFFILIATION = {Department of Communication Networks (ComNets), Faculty 6, RWTH Aachen University},
ISBN = {3-86139-930-0},
URL = {https://www.comnets.rwth-aachen.de}
}
Signature in CN-Library = {A84}