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Power-saving functions in IEEE 802154 are designed for general-purpose low power networks For the multihop sensor networks requiring long battery life, an upper layer solution is required for the following two reasons First, it requires a ne control to maximize the ef ciency For example, the minimum superframe duration in 24-GHz channels is 1536 ms When a device keeps two superframes (incoming and outgoing) in a beacon interval, the active ratio of the device is more than 6% if the beacon interval is 49152 ms With the parameters of the device and two AA batteries discussed in the previous section, the device will last around 2 months Second, it requires a control to provide reliable communication As presented in the previous section, communication should be supported without continuous beacon collisions.

Figure 15.2 [1]. The lowest level is a group of sensor nodes that perform sensing, computing, and in-network processing in a eld. The data collected within the sensor network are rst propagated to its gateway node (second level). Next the gateway node relays the data through a transit network to a remote base station (third level). Finally, the base station connects to a database replica across the Internet. Among the four tiers, the resource within the sensor networks is the most constrained. In most of the applications, the sensor network is composed of sensors and a gateway node (sink), as shown in Figure 15.3, although the number of sinks or sources might vary from application to application.

Since a user cannot control internal operations of the MAC protocol from the upper layer, the only way of doing so is by using the standard interfaces named MAC primitives The primitives are interfaces for standard services de ned in IEEE 802154 Like a function call in the program language, the primitives convey required information as parameters and then execute appropriate services There are four types of primitives: request, con rm, indication, and response Request is the primitive called by the upper layer to initiate a service at the lower layer Con rm is the primitive called by the lower layer to pass the result of the previous request to the upper layer On the other hand, indication is the primitive called by the lower layer to the upper layer to tell the remote request or an internal event.

Response is a primitive to complete the procedure invoked by the previous indication IEEE 802154 has two service access points (SAPs) One is the MAC data SAP named MAC common part sublayer (MCPS) data service The other is the MAC management SAP named MAC sublayer management entity (MLME) service IEEE 802154 provides two MCPS primitive sets One is the MCPSDATA set, which transmits or receives a data frame The other is the MCPSPURGE set, which purges out a frame in the transaction queue MLME provides 15 primitive sets for management functions, including association, scan, and synchronization The database named MAC PAN Information Base (PIB) for MAC operations is also accessible by two sets of MLME services: MLME-SET and MLME-GET A power-saving algorithm in the upper layer uses these primitives In order to transmit a command frame, MCPS-DATArequest is used The command frame will invoke MCAP-DATA.

det (8Vech(X X)) 8vech(X)' det (8veCh(X 8vech(X),

indication at the receiver and then the.

where 1/ w = the average walking time of a pedestrian from the onset of the call until he reaches the boundary of the cell 1/ d = the average delay time a pedestrian spends waiting at the intersection to cross the road 1/ o = the average walking time of a pedestrian in the new cell 1 = wPdelay/( d w) 2 = oPdelay/( d o) Pdelay = PcrossPd, the proportion of pedestrians leaving the cell by crossing the road Pd = the probability that a pedestrian would be delayed when he crosses the road = H(1 Pf )/[ H(1 Pf ) + O(1 BO)] 1.5.1.4 Xie and Kuek s Traffic Model (One- and Two-Dimensional) This model assumes a uniform density of mobile users throughout an area and that a user is equally likely to move in any direction with respect to the cell border. From this assumption, Xie and Kuek [8] showed that the arrival rate of handoff calls is

Just as with the blog and entry subscription forms, you can create a form to enable users to subscribe to an entry. The format, shown in Listing 9-6, is eerily similar and should be placed on your individual archive page or on any template within an entry context (for example, within an <MTEntries> loop).

Hence, one has to nd the set of variables that satis es the condition given above, and the problem becomes that of a mathematical minimisation procedure. A differential relationship can be derived [1] to give

of attitude, noted at the outset of this chapter, is comprehensible when the ubiquity of attitudes is recognized. REFERENCES