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10.7 MULTIHOP RELAY MODE WiMAX PMP and WiMAX mesh are not compatible in the sense that their MAC frame structures and operations cannot coexist. Thus, the bene ts of multihop communications in WiMAX mesh are not readily available to WiMAX PMP. In view of this problem, in 2006 the IEEE 802.16j Working Group began to draft a speci cation for multihop relay mode operation that is backward-compatible to WiMAX PMP, as illustrated Figure 10.1(c). The backward compatibility means that the existing WiMAX PMP SSs will function normally in enhanced multihop relay networks. However, some modi cations to the WiMAX PMP BS must be made to allow communication with the RS and support aggregation of traf c from multiple RSs. To obtain the best possible network performance, the characteristics of RSs and their placement must be chosen carefully. There are three types of RSs: xed, nomadic and mobile [28]. Fixed RS is installed permanently at a xed location. Nomadic RS is intended to function from a location that is xed for a period of time comparable to a user session. Finally, mobile RS is fully mobile and may be installed on moving vehicles, such as a bus, train, or ferry. In some cases, an SS may also act as a RS. The multihop relay mode is signi cantly different from WiMAX mesh in the sense that it does not support peer-to-peer communications between two SSs. Similar to WiMAX mesh, the multihop relay mode is expected to bring about coverage extension and capacity improvement to WiMAX PMP. As of late 2007, the speci cation is still being developed and the rst draft is undergoing letter balloting [29]. Hence, the detail presented in this section, although up to date, may differ from the nal speci cation.

(I have a separate business phone and fax line It makes the business appear much more professional) The insurance cost is 25 percent of my homeowner s policy, and I discuss this in the Insurance section later in the chapter Finally, I include a small amount for repairs and supplies..

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230 VIDEO AND MULTIMEDIA TRANSMISSIONS OVER CELLULAR NETWORKS prospective changes to the network infrastructure are in the agenda of many operators, including technology upgrades such as High Speed Downlink Packet Access (HSDPA) and IP Multimedia Subsystem (IMS) (Bannister et al 2004) All these aspects build a potential for changes in the traf c pattern that can occur at the macroscopic scale (network-wide) and in a relatively short time frame In such a scenario, the ability to accurately and extensively monitor the actual network state and to early detect global performance drifts or localized anomalies is fundamental to the network operation and engineering processes Among other problems it is important to early detect emerging bottlenecks, that is, network elements which are under-provisioned and therefore cause performance degradation to some traf c aggregate as its volume increases.

How will the production data be converted from the old systems to the new systems How will new data elements be integrated into existing and historic data stores and reporting processes What validation will need to occur to ensure that vital production records remain intact throughout the conversion / implementation process and beyond How will the users get trained and cut over to the new system How will interfaces get swung to the new system with minimal rework and impact to existing processes How will outputs be transitioned from old processes to new ones For completely new outputs, how will users and clients be notified and how will the output get integrated into the production processes What situations would be considered candidates for backing out of the conversion process What special problem management and user support resources and processes need to be put in place temporarily to handle the go-live time frames

A bottleneck in the Radio Access Network (RAN) can be a geographical area that is frequently overloaded because the provisioned radio capacity does not match the peak-hour traf c demand A bottleneck in the Core Network (CN) is often a link or other network element with insuf cient capacity to carry peak-hour traf c A capacity bottleneck always impacts a certain traf c aggregate rather than isolated ows for example, all the traf c directed to a certain radio area, or routed over a certain network element The classical approach to reveal capacity bottlenecks is to compare coarse measurements of the actual traf c volume, typically obtained by Simple Network Management Protocol (SNMP) counters, with the nominal provisioned capacity.