Network Topology

Describe the differences between different modes of operation in IEEE 802.1 lx MAC layer (DCF and PCF) and how HCF and EDCF can be used to solve the problem of PCF in supporting QoS in wireless network.

Describe the methods used by vendors to increase the throughput capacity and the coverage area of WLAN, and how these actions in return affect the development of WLAN.

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How can a distributed multitree database architecture be used in a cellular network with location updates? Briefly discuss why it can obtain better performance than the GSM HLR-VLR architecture.

Summarize the idea of the localized topology control protocol TCP2P and discuss how it can integrate both P2P system topology control and wireless ad hoc network topology control.

Since the RLC layer in UMTS mobile has packet retransmission capability in case a packet is corrupted, there is no need for the TCP layer to do any TCP packet retransmission because all the potential error packets are taken care by the lower layer (RLC layer) in the protocol stack [True/False].

In UMTS Re1 99, the system capacity of high bit rate packet data users mixed with regular voice users will be limited by the number of orthogonal codes [True/False].

In UMTS Rel-99, the RNC is responsible for dynamically controlling the physical resources allocated to the data bearer [True/False].

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