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Nowadays, there are two WiMAX-related standardization
organizations: IEEE **2.*6 Working Group and WiMAX Forum. The
IEEE**2.*6 Working Group aims to create standards for broadband
wireless access, while the WiMAX Forum is an industry-led
non-profitable organization committed to promoting and certifying
interoperable WiMAX products.
As the first company to put forward the concept of carrier-grade
WiMAX network, ZTE has always been devoting itself to the
development of WiMAX standards. The company has already submitted
more than **0 proposals to the IEEE **2.*6 Working Group covering
control channel, frame structure, multi-hop relay, Femto Base
Station (BS), mobility management, etc. Additionally, as one of *5
board members of the WiMAX Forum, ZTE has submitted over **0
proposals to the forum involving hot topics such as MultiCast
BroadCast Service (MCBCS), Emergency Service (ES), IP Multi-media
Subsystem (IMS), Policy and Charge Control (PCC), and Simple
IP.
Due to their outstanding contribution to the setting of WiMAX
standards, many experts from ZTE are honored to lead the
standardization process. Among them, Tricci So is elected as
Chairman of the MCBCS Working Group in the WiMAX Forum; Jerry Chow
is invited to be Chairman of the IEEE **2.*6m E-MBS Rapporteur
Group; Mary Chion is appointed as Chairman of the IEEE **2.*6m
Handoff E-MBS Rapporteur Group.
MCBCS
The
unicast network offers personalized contents to end users on a
one-to-one basis, with each user occupying independent spectrum and
network resource. However, this resource could be shared by all
users when the same content is delivered. MCBCS can effectively
utilize the limited resources to broadcast the same content to
multiple users. Mobile TV is a typical application of MCBCS. As the
spectrum resource is limited, and most of the users\' requirements
can be classified, MCBCS is receiving increasing attention in the
industry.
At present, a MCBCS subgroup has been established in the Network
Working Group (NGW) Release 1.5 of the WiMAX Forum and it plans to
finish the related standardization work in two phases. Broadcast
and static multicast service will be provided in the first phase
and dynamic multicast service will be supported in the second
phase. The basic technical documents of the first phase have been
finished, which specifies the MCBCS network architecture, service
initiation, service setup/release procedures, mobility management,
power saving support, data transmission, and data synchronization.
They are in the Verification and Validation (V&V) comments
resolution process and will be released in the Q1 of
***9.
Being the leader of the MCBCS subgroup, ZTE has been undertaking
great responsibilities and has submitted proposals covering almost
all key technical points. Despite of the fierce arguments and a
wide divergence of views from different operators and equipment
vendors, ZTE managed to bring different opinions into agreement and
keep the standardization work on schedule.
Multi-Hop Relay
All BSs of current wireless communications system need the support
of fixed lines, and their coverage is relatively fixed. Because of
the barriers on the transmission routes or long distance
transmission, blind areas or edge areas with serious signal
attenuation are formed. To expand the coverage and improve the
service quality for the edge users, the IEEE **2.*6 Working Group
proposes the multi-hop relay technology, in which one or more
wireless Relay Stations (RSs) are added into the system to decode
or demodulate the received signals into source signals for storage
and processing. After being coded and modulated, the source signals
are sent to the receiver.
The IEEE **2.*6 Working Group has two subgroups related to
multi-hop relay: Relay Task Group (RTG) and IEEE **2.*6m Task Group
(TGm). RTG aims to develop IEEE **2.*6j standards, hoping to
introduce the multi-hop relay technology based on IEEE **2.*6e
standards. The IEEE **2.*6j D8 is currently under sponsor ballot
and the IEEE **2.*6j D9, which will be finished in February ***9,
will integrate the IEEE **2.*6e to form a complete IEEE **2.*6 Rev2
standard. The objective of TGm is to provide higher mobility and
transmission rate to fulfill the IMT-Advanced requirements. A Relay
Rapporteur Group is established in TGm to draft system description
related to the IEEE **2.*6m multi-hop relay.
The system topology will be changed due to the adding of wireless
RSs. Therefore, it is necessary to intelligently adjust the
topological relation and configuration between the RSs and BSs.
Specifically, the impact on the system from connection, release and
handoff of the RSs should be taken into consideration, and full use
of the RSs should be made to improve data transmission efficiency.
For example, when a RS performs handoff from the serving BS to a
target BS, it must allow its connected RSs or mobile terminals to
be handoffed first to the target BS. Another case is that the BS
must inform the RS to transmit the corresponding data delay so that
it can transmit MCBCS data synchronously with the BS. One more
example is that the RS can directly forward data for transmission
between its connected two mobile terminals without transmitting
them to the BS, which improves data transmission
efficiency.
ZTE has submitted more than *0 relay-related proposals to RTG and
TGm, with content covering data transmission methods, MCBCS, relay
data format, as well as connection, release and handoff of the
RSs.
