19-08-2013, 04:06 PM
Mobile Virtual Reality Service
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INTRODUCTION
A mobile virtual reality service (VRS) will make the presence and
presentation of the sounds and sights of an actual physical environment virtually
available everywhere in real time through the use of mobile telecommunication
devices and networks. Furthermore, the VRS is the conversion of a physical
system into its digital representation in a three-dimension (3D) multimedia
format. This paper addresses one aspect of the notion of bringing an actual
multimedia environment to its virtual presence everywhere in real time .An
international telecommunication union (ITC) recommendation document,
containing ITU’s visions on mostly forward-looking and innovative services and
network capabilities, addresses the capability needed in a telecommunication
system to allow mobile access to real-time sights and sounds of an actual
physical environment in the contest and forms of a VRS episode .
PROBLEM STATEMENT
From a users perspective, the VRS is defined as the experience of
viewing an object in its 3D environment and sensing its sound with its natural
and real-world quality. By limiting the VRS to sight and sound, it is meant to
disclaim creation of any other aspects of an actual physical environment, for
example, smell of a flower or taste of a food.
VRS EPISODES
A VRS episode is defined as the real-time establishment of sights and
sounds steaming communication between one or more VRS users and sites. As a
call is the establishment of communication between users in a voice network,
and a session is a establishment of communication among severs and client in an
IP multimedia network,aVRS episode is the establishment of a collection of calls
and/or sessions in a multimedia super-high-capacity virtual reality environment.
ACTUAL PHYSICAL ENVIRONMENT
An actual physical environment (APE) is the real world environment
of the subject to be presented (through sight and sound) to one or more VRS
users or user equipment. Furthermore, it is the actual subject environment that is
transmitted to and audio visually formed in a virtual environment.
VRS USER EQUIPMENT
VRS user terminal equipment (VUE) is the end-point device used by a
user to transmit data on an APE and/or to receive data for establishing a VRS
episode. The VUE can be in the shape and content of a toolkit such as a single
handset, a headset, a helmet, a pair of gloves, a desk, a chair, a keyboard, a
mouse, a screen, a video camera, or a recording device. It could also consist of
any combination of these toolkits. The VUE is primarily a software-driven
Dept. of ECE
9Mobile Virtual Reality Service
device and is controlled and/or manned by one or more users, network or both.
An example of the VUE may be a setup similar to today’s T1connection using
two pairs of normal twisted wires, the same as one would find in a house or in a
private booth. The use this VUE device is essential for both creation and
provisioning of desired VRS episodes related to various applications. Another
example of the VUE could be the equipment used by a head surgeon in his
office environment to remotely guide a group of assistant surgeons performing a
surgical procedure in a hospital.
GATEWAY ENTITY
The gateway entity (GWE) is a boundary functional entity with each
VCS. It is the connecting point of all VECEs in a VCS network from one side
and the GWE of another VCS from the other side. It is the point of entry and exit
for all VRS episode control signaling message follows to and from a VCS,
respectively. In addition, the GWE plays the role of a firewall, hides the
structure of its underlying network, and facilities the flow and routing of the
VRS signaling traffic. Figure 2 also shows the instance of two GWEs for a
hypothetical VRS episode.
VRS SYSTEMS ARCHITECTURE AND
CONFIGURATION
Figure 2 presents a schematic implementation of the VRS functional
architecture with two primary VCS subsystems, home and visited, for one VUE
and several secondary VCS subsystems, each serving one or more APEs. The
example in Figure2 shows only one VUE. However, it could be expanded to
include multiple VUEs participating in a single VRS episode. The figure
presents a configuration example for establishing a VRS episode. Each arrow in
the figure corresponds to a signaling message exchange requesting an action or
responding to a request. The VUE is the user equipment initiating a VRS
episode setup. The VUE is visiting a network where the P-VECE is its first point
of entry into the core network system, a visited V-VCS. For ease of illustration,
in this example the H-VCS of the VUE is assumed and shown to be the same as
the S-VCS. Therefore, the S-VECE is located in the VUE’s home network. In
addition, in this configuration example the VRS episode management entity
VEME is assumed to be located in the VCE’s home network.
CONCLUSION
It calls for an SHDR transmission capability for the end-user
equipment and networks. Assuming the availability of an SHDR transmission
capability for the end-user equipment and networks, an example of the VRS
system architecture was presented, and a systematic approach was proposed for
a VRS implementation scenario. It illustrated a VRS control scheme and
described the signaling information flows for setting up a VRS episode. This
paper neither proposes the use of any specific transport or control protocols for
implementation of the required tasks, nor does it restrict the use of any specific
standard protocol. A number of presently available protocols may be revised and
enhanced foe initiating, establishing, and controlling VRS episode.