Conference Paper

A Novel Mechanism for Radio Capacity Maximization during MBMS Transmissions in B3G Networks

DOI: 10.1145/1454503.1454538 Conference: Proceedings of the 11th International Symposium on Modeling Analysis and Simulation of Wireless and Mobile Systems, MSWiM 2008, Vancouver, British Columbia, Canada, October 27-31, 2008
Source: DBLP
ABSTRACT
This paper proposes a novel mechanism for efficient power control during multicast transmissions in Beyond rd Generation (B3G) mobile networks. The mechanism utilizes optimally the available power resources of Universal Mobile Telecommunication System (UMTS) base stations, resulting to network capacity maximization. The proposed mechanism is based on the concept of transport channels combination (point-to- point and/or point-to-multipoint radio bearers) in any cell/sector of the network in which Multimedia Broadcast/Multicast Service (MBMS) users are residing. In particular, the transport channel combination that minimizes the transmission power of the base station is selected for the transmission of the MBMS traffic to the corresponding cell. The mechanism is evaluated through several realistic scenarios and the results indicate the ability of the mechanism to utilize optimally the radio resources of the network. Furthermore, our approach is compared with several power control mechanisms existing in the bibliography, including the rd Generation Partnership Project (3GPP) approaches (presented in 3GPP TS 25.346 and 3GPP TR 25.922), in order to highlight the enhancements that it provides.

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A Novel Mechanism for Radio Capacity Maximization
during MBMS Transmissions in B3G Networks
Antonios Alexiou, Christos Bouras, Vasileios Kokkinos, Evangelos Rekkas
Research Academic Computer Technology Institute, Greece and
Computer Engineering and Informatics Dept., Univ. of Patras, Greece
University of Patras, Rio Campus, 26500 Rio, Patras, Greece
+302610996951, +302610996954
alexiua@cti.gr, bouras@cti.gr, kokkinos@cti.gr, rekkas@cti.gr
ABSTRACT
This paper proposes a novel mechanism for efficient power
control during multicast transmissions in Beyond 3
rd
Generation
(B3G) mobile networks. The mechanism utilizes optimally the
available power resources of Universal Mobile
Telecommunication System (UMTS) base stations, resulting to
network capacity maximization. The proposed mechanism is
based on the concept of transport channels combination (point-to-
point and/or point-to-multipoint radio bearers) in any cell/sector
of the network in which Multimedia Broadcast/Multicast Service
(MBMS) users are residing. In particular, the transport channel
combination that minimizes the transmission power of the base
station is selected for the transmission of the MBMS traffic to the
corresponding cell. The mechanism is evaluated through several
realistic scenarios and the results indicate the ability of the
mechanism to utilize optimally the radio resources of the network.
Furthermore, our approach is compared with several power
control mechanisms existing in the bibliography, including the 3
rd
Generation Partnership Project (3GPP) approaches (presented in
3GPP TS 25.346 and 3GPP TR 25.922), in order to highlight the
enhancements that it provides.
Categories and Subject Descriptors
C.2.1 [Computer-Communication Networks]: Network
Architecture and Design – Wireless communication; C.2.3
[Computer-Communication Networks]: Network Operations –
Network Management, Public networks; H.5.1 [Information
Interfaces and Presentation]: Multimedia Information Systems
Evaluation/methodology.
General Terms
Design, Management, Performance, Verification.
Keywords
UMTS, HSDPA, MBMS, RRM, Power Control.
1. INTRODUCTION
Indisputably, there is a rapidly increasing market for wireless
multimedia applications, such as Mobile TV, that are expected to
face high penetration in future mobile communications industry.
As a consequence, in B3G mobile networks the amount of
multimedia data traffic will surpass the amount of voice traffic. In
order to confront such high requirements for multimedia content,
the MBMS framework was introduced in the Release 6 of the
UMTS architecture. MBMS is a unidirectional service in which
multimedia data is transmitted from a single source entity to
multiple destinations, allowing resources to be shared in an
economical way [1], [2]. As the term indicates, MBMS consists of
the broadcast and the multicast operation modes.
However, the spread of multimedia data differentiates the current
landscape of Radio Resource Management (RRM) in MBMS and
poses the need for further enhancements. The main requirement
during the provision of MBMS multicast services is to make an
efficient overall usage of radio and network resources. This
necessity mainly translates into improved power control
strategies, since the base stations’ transmission power is the
limiting factor of downlink capacity in UMTS networks. Under
this prism, a critical aspect of MBMS performance is the selection
of the most efficient radio bearer for the transmission of MBMS
multicast traffic. A wrong channel selection may result to a
significant capacity decrease, thus, preventing the mass delivery
of multimedia applications.
In this paper, we propose a power control mechanism for efficient
radio bearer selection in MBMS. The mechanism enhances
MBMS performance in the frame of maximizing radio capacity in
B3G networks. The proposed scheme adopts downlink
transmission power as the optimum criterion for radio bearer
deployment and selects the transport channel combination that
minimizes the transmission power of the base station. Point-to-
Point (PTP) and Point-to-Multipoint (PTM) transmission modes
may be used separately or may be combined and deployed in
parallel. In this way, the mechanism optimally utilizes power
resources and significantly improves radio resources’ allocation.
The paper is structured as follows: In Section 2, we present the
motivation behind our study and the related work in the specific
field. Section 3 is dedicated to an in depth analysis of RRM in
MBMS. Section 4 presents the proposed power control
mechanism, while Section 5 is dedicated to the presentation of the
results. Finally, concluding remarks and planned next steps are
briefly described in Section 6.
Permission to make digital or hard copies of all or part of this work for
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copies bear this notice and the full citation on the first page. To copy
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requires prior specific permission and/or a fee.
MSWiM’08, October 27–31, 2008, Vancouver, BC, Canada.
Copyright 2008 ACM 978-1-60558-235-1/08/10...$5.00.
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    • "One option is to choose between PtP and PtM channels based not only on the number of UEs, but also on their actual positions in the cell, so as to switch at the actual optimal point [25]. Another option is to employ a single PtM channel for UEs close to the center of the cell and separate PtP channels for the remaining UEs [25], [26]. Both options can be combined with MCV MBMS to optimize the energy consumption separately for each layer. "
    [Show abstract] [Hide abstract] ABSTRACT: The Multimedia Broadcast/Multicast Service (MBMS) was designed to enable the mass distribution of multimedia content in 3rd Generation and beyond cellular networks. If such services are to become commercially viable, they must be able to efficiently support widely heterogeneous user requirements, for example, due to terminal limitations and cost constraints. This paper presents an MBMS extension that allows multiple variants of the same content to be economically distributed to heterogeneous receivers, explicitly taking into account the possibility of using either dedicated or common radio channels. We describe our extended multiple content variant MBMS model by explaining the modifications that it imposes on the standard MBMS model, as well as the manner in which it can be combined with layered coding. We also present an analytical evaluation of our approach against alternatives based on the standard MBMS in terms of control and user plane overhead, and compare the analytical predictions with detailed simulation results. Both the analysis and the simulations indicate that our proposal can indeed satisfy heterogeneous user requirements, while consuming considerably lower resources than the standard-based alternatives. Copyright © 2010 John Wiley & Sons, Ltd.
    Full-text · Article · Jun 2011 · International Journal of Communication Systems
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    • "Moreover, this new concept introduces new intra-cell handovers that we also analyse and propose a new handover algorithm to efficiently address them. Later, a similar approach (building on our work [18]) focusing on the High Speed Downlink Packet Access (HSDPA), was proposed in [20]. "
    [Show abstract] [Hide abstract] ABSTRACT: As currently specified by 3GPP, Multimedia Broadcast Multicast Service (MBMS) bearer services can be provided within a cell either by Point-to-Point (P-t-P) or Point-to-Multipoint (P-t-M) transmission mode, but not both at the same time. If P-t-P transmission mode is selected for a cell, one Dedicated Channel (DCH) is established for each user within the cell that joined the MBMS service. Otherwise, if P-t-M transmission mode is selected, one Forward Access Channel (FACH) is established covering the whole cell’s area and commonly shared by all the UEs within. In this paper, we highlight the inefficiencies that can be caused with the aforementioned approach and introduce the “Dual Transmission mode cell” in which P-t-P and P-t-M transmissions (i.e. multiple DCHs and FACH) are allowed to coexist within the same cell. Hence, we propose a new radio resource allocation algorithm and solution to address them. Our proposed algorithm considers the instantaneous distribution and movement of the users within the cell and dynamically decides which users will use FACH and which DCH, in such a way that the requested Quality of Service (QoS) is supported with the least amount of transmission power (i.e. capacity) consumption. Moreover, with the “Dual Transmission mode cell”, new types of intra-cell handovers are introduced which we also analyse and propose a new handover algorithm to address them. The performance evaluation carried out showed that our proposed “Dual Transmission mode cell” approach, provides considerable gains, as well as outperforming all other related approaches, such as “UE Counting”, “Power Counting”, “Rate Splitting”, and “FACH with dynamic power setting”, in terms of capacity and link performance efficiency.
    Full-text · Article · Feb 2011 · Computer Networks