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課程名稱︰無線多媒體系統研究
課程性質︰多媒體
課程教師︰吳曉光
開課學院：電資
開課系所︰資工
考試日期（年月日）︰
考試時限（分鐘）：2010.06.16
是否需發放獎勵金： 是
（如未明確表示，則不予發放）
試題 :
1. Providing real time services such as voice or video over ad hoc
network is a challenge. Usuallu QoS routing will be required for
real time connections. (a) Describe the difference QoS routing and
shortest path routing. (b) Usually bandwidth constraint must be satisfied
for the required voice and video. How do you calculate the available bandwidth
for ad hoc node if you have 2M bits per second bandwidth. As figure,
the video connection is constructed from sender to receiver, how many
bandwidth resource could be consumed for each node (sender, R1,R2 and receiver)
(C) If you need to employ two alternative paths, how would you extend DSR
algorithm? (d) Multipath routing has been proposed to satisfy QoS requirement.
Can you describe the advantages and disadvantages for multipath routing?
2. (A) The Main goal of both the Mobile IPv4 and the Mobile IPv6 protocols
is to allow a MN to continue communicating with its correspondent nodes(CNs)
during its movement. Decribe the key improvements of the Mobile IPv6
protocol from the Mobile IPv4 protocols. (B) The IETF has defined two
hierarchical mobile routing protocols: The Hiratchical Mobile IP_v4 protocol
and the Hierarchical Mobile IPv6 protocol. Illustrate the purposes of
hierarchical mobility management. Discuss the similarities and differences of
HMIPv4 versus HMIPv6. (C) In order to adapt the Mobile IPv4 protocol so that
is can handle multicast forwarding with adequate scalability, a new approached
called Mobile Multicast Protocol (MoM) was introduced. Illustrate the advantages
and limitations of MoM. (D) Illustrate the motivation of the Range-Based Mobile
Muticast Protocol (RBMoM). Discuss the advantages and limitation of RBMoM.
3. THe approach emplyed by UWB radio devices is based on sharing already
occupied spectrum resources by means of the overlay printciple, rather than
looking for still available but possibly unsuitable new bands. (A) Describe the
general defination used within the FCC's First Report and Order and widely
accepted by the industry for a UWB device. (B) Explain what is meaning of the
spectral efficiency. (C) Does IEEE 802.15.3 apply master station approach as
BLueTooth? How is UWB different from frequency hoppinng used in Bluetooth?
(D) How IEEE 802.15.3 accomodate continuous and burstry traffic. Explain.
4. (A) A directr mechanism for achieving multicast reception on MHs is to
let HA handle multicast routing by executing IGMP and delivering multicasts to
the MHs as if it was at home. In current IETF mobile multicast, is it qualified
as remote subscription or bi-direction tunnel multicast? Advantage? Disadvantage?
(b) What is the duoplication problem? (c) What is the tunnel convergent problem?
(d) Can you describe what is "combined routing"? advantage? Disadvantage? (e)
WHat is the scoping problem?
5. A critical design issue for future wireless ad hoc networks is the
development of suitable communication architecture, protocols and services
that efficiently reduce power consumption thereby increasing the operational
lifetime of network enable devices. For small communication devices (such as
sensors, PDAs, etc), reducing the transmission power may significantly
extend the operational lifetime of a device, thus enhancing the overall user
experience. A distance between two nodes could be determined by propagation
model or GPS. Can you enhance DSR(Dynamic Source Routing) to minimize the total
transmission power needed to forward packets between devices in ad hoc wireless
networks either through (A) propagation model or (B) GPS location information?
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