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The IEEE 80216 standardizes the air interface and related functions associated with the WLL There have been three groups that have been characterized for this standard The 802161 is the air interface for the 10 66 GHz The 802162 is the standard for the coexistence of BWA systems The 802163 standard is the air interface for the licensed frequencies of 2 11 GHz Of the standards listed above, 802161 has had the most work completed thus far This standard will probably generate the most interest in industry since it targets available frequency bands An 80216 wireless service provides a communications path between a subscriber site and a core network A few examples of core networks are the public telephone network and the Internet Some protocols are de ned speci cally for wireless transmission of blocks of data over a network.

The standards are organized into a three-layer architecture The lowest layer is the PHY layer This speci es the frequency bands, modulation schemes, error correction techniques, synchronization between TX and RX, data rate, and TDM structure The layer above the PHY layer, the one associated with the functions that provide service to subscribers, has functions associated with transmitting data on frames and controlling access to the shared wireless medium These are all grouped into the MAC layer The protocol in this layer de nes how and when a BS or subscriber station (SS) may initiate transmission on the channel The MAC layer must also allocate the medium resources to satisfy the QoS demands The highest of the three layers of the architecture described in this section is above the MAC layer.

In this chapter s folder on the CD-ROM that accompanies this book is a file named currentTime.fla. Copy the file to your hard drive and use your operating system utilities to disable the file s read-only attributes. Open the file in Flash for an example of a movie clip that displays the current time. Choose Control Test Movie to see the date displayed. To use the movie clip in your own design, open the file using the Open as Library command and then drag the movie clip into the document Library of your current project. You can then edit the dynamic text box in the movie clip to change the text attributes and choose a different font style or color. If you choose a larger font size, you may have to resize the dynamic text box with the Text tool.

This layer is a convergence layer that provides functionality to the service that is currently being provided to the subscriber For IEEE 802161, this includes digital, audio/video multicasting, digital telephony, asynchronous transfer mode (ATM), Internet access, frame relay, and wireless trunks in telephone networks and frame relay The 80216 networks work in the following way: A subscriber sends wireless traf c at speeds ranging from 2 to 155 Mbps from a xed antenna on a building The BS receives transmissions from multiple sites and sends traf c over wireless or wired links to a switching center using the 80216 protocols Then, the switching center sends traf c to an ISP or the PSTN 194 SUBLAYERS FOR MAC.

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302 15

broadcasting frame transmission follows the same procedure as LP since it is not acknowledged Figure 185 gives an example of time lines of LPA Compared to LP, the overhead for a frame transmission is reduced by half on average Moreover, the overhead for reception decreases to only one WR and a data frame However, broadcasting is not bene cial since it is not acknowledged by a WA Moreover, the minimum wakeup duration tminW becomes almost twice as long compared with that of LP It is due to sparse WR transmissions by the transmitter to allow suf cient time for the WA to be received in between two adjacent WRs Thus, the receiver has to stay awake longer to ensure there is a sequence of WRs or not.

1 P(y j /xi ) 1 P(y j /xi ) 1 P(y j /xi )

Consequently, even though LPA is a solution designed to overcome the disadvantage of LP, LPA spends more energy if r and tWI are small 18323 Long Preamble with Acknowledgment after Local Synchronization LPAS adopts the local synchronization algorithms proposed in [4, 5] Even though LPA reduces the overheads of a transmitter and a receiver, it still engenders inevitable overhead at the transmitter because the transmission is started asynchronously LPAS is a local synchronization algorithm that estimates the schedule of the receiver and transmits a frame on the receiver s schedule At rst, the frame transmission is the same as LPA However, when a transmitter receives a WA, it logs the time Subsequently, when it transmits to the same receiver, it estimates the schedule of the receiver and waits for its next active time When the time comes, it turns on the transceiver.