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Figure 6Backward hardware compatibility.tion. Figure 6 shows the backward hardwarecompatibility concept. The baseband unit,C, is added to the existing RBS to improvefunctionality and capacity.Downlink processingboard—TX boardDownlink processing functionsFigure 7 shows the main function blocks forprocessing the downlink. Each of theseblocks also contains other baseband functions(not pictured). The first process is frameprotocol (FP) handling (pictured left). Afterconfirming when the data frames on the commonchannels (paging channel, PCH, andforward access channel, FACH) and the dedicatedchannels (DCH) arrived from the lubinterface, the frame protocol handler alignsthe frames and extracts the payload part ofthe data frame. The payload part contains thedata of the uncoded transport channels.For the dedicated channels, the encodingfunction block• generates the cyclic redundancy check(CRC);• concatenates the transport blocks;• segments the coding blocks;• performs convolutional coding or turbocoding;• inserts the first discontinuous transmission.(DTX);• matches rates; and• performs the first interleaving.To fit the 10 ms radio frame, the transportblocks from different transport channels aremultiplexed in the multiplexing unit(MUX) function block. This activity is followedby insertion of the second DTX, thesecond interleaving, and multicode splitting.Data and control information are thensent to the cell-split function block. Thecontrol information contains transport formatcombination indicator (TFCI) bits andcorresponding transmission power control(TPC) commands which have been mappedwith pilot bits onto the dedicated physicalcontrol channel (DPCCH).After the frame protocols have been handled,the broadcast channel (BCH, which ismapped to the primary common controlphysical channel, P-CCPCH, and to PCHand FACH) and PCH and FACH (which aremapped to the secondary common controlphysical dedicated channel, S-CCPCH) areprocessed in a manner similar to that describedfor the dedicated channels. The cellsplitfunction identifies the common anddedicated physical channels that belong toone cell carrier. These processes are followedby modulation, spreading and weighting,36 Ericsson Review No. 1, 2003
DL/UL l/fFigure 7Downlink processing function blocks.with power information for the downlinkpower control, and scrambling.TX board implementationFigure 8 shows the downlink processingboard (TX board), which is divided into twomain parts: the board processor and boardspecifichardware. The board processor controlsthe board and parts of the traffic. Theboard-specific hardware, which processesuser data sent to the air interface, containsthe lub user-plane interface handler,symbol-rate processor, chip-rate processor,and the physical layer processing controller.The lub user-plane interface handler handlesthe lub interface user-plane protocol forthe DCH and CCH data streams to the radionetwork controller.The symbol-rate processor handles thetransport channel (TrCH), the coded compositetransport channel (CCTrCH), thephysical channel for the primary and secondarycommon control physical channels,the paging indicator channel (PICH), andthe dedicated physical channel (DPCH).The chip-rate processor handles the distributionof physical channels, generates thesynchronization channel (SCH), the primarycommon pilot channel (P-CPICH) andacquisition indicator channel (AICH), andtransmits the distributed output sequencesto the TRX. It also measures the transmittedcode power and handles all cell-carrierprocessing-related functionality.The physical layer processing controllerhandles the configuration of the symbol-Figure 8TX board implementation.Ericsson Review No. 1, 2003 37
Page 1 and 2: Ericsson 1/2003REVIEWTHE TELECOMMUN
Page 3 and 4: EricssonREVIEWTHE TELECOMMUNICATION
Page 5 and 6: systems built from Ericsson's produ
Page 7: EditorialEric PetersonSince joining
Page 10 and 11: Figure 3Interoperability of mobile
Page 12 and 13: Figure 7Handover from GSM to WCDMA.
Page 14 and 15: OMA—Changing the mobile standards
Page 16 and 17: Figure 3The OMA enables wireless co
Page 18 and 19: instance, the WAP Forum created mob
Page 20 and 21: The service network framework—An
Page 22 and 23: Figure 3Architectural views of the
Page 24 and 25: Figure 7SNF system type view.Sysfem
Page 26 and 27: Figure 9High-availability deploymen
Page 28 and 29: Realizing the operator's service ne
Page 30 and 31: Figure 3Consultative approach to me
Page 32 and 33: Figure 4MMS integration interfaces.
Page 34 and 35: Advanced baseband technology in thi
Page 36 and 37: channels. A channel element is defi
Page 40 and 41: Figure 9TX board of the RBS3000 ser
Page 42 and 43: Figure 11RAX board implementation.
Page 44: Previous issuesNo. 3, 2002Packet da

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