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Figure 9.9. Structure of P-SCH and S-SCH for cell search.
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scrambling code. This is used as a common reference for channel estimation and timing acquisition at the mobile. Synchronization channel (SCH) a common physical channel used for cell searching by the mobiles. There are two subchannels, namely, the primary SCH and secondary SCH as illustrated in Figure 9.9. Both the P-SCH and S-SCH are sent only during the rst 256 chips of each timeslot and are transmitted in parallel. Please see References 1 and 3 for details on the cell search operation. Primary common control physical channel (P-CCPCH) a commonphysical channel supporting the BCH transport channel, carrying cell broadcast information. It has a xed data rate of 30 kbps and a xed spreading factor of 256. Since the P-CCPCH is time-multiplexed with the SCH, the rst 256 chips in every timeslot are not transmitted and hence, the effective data rate is reduced to 27 kbps.There is no closed-loop power control in this channel, and it needs to be demodulated by all terminals in the cell. Secondary common control physical channel (S-CCPCH) a common physical channel used to support the PCH and FACH (transport channels) in the downlink. A xed spreading factor of 256 is used, and variable data rates can be supported by discontinuous transmission (DTX) and rate matching. Similar to the P-CCPCH, there is no closed-loop power control in S-CCPCH. Physical random access channel (PRACH) a common physical channel supporting the RACH transport channel. It is a contention-based uplink channel that can be used to carry control information or a small amount of user data from the mobile to the network. Similarly, no closed-loop power control is supported. Physical common packet channel (PCPCH) a common physical channel supporting the CPCH transport channel for carrying bursty data traf c in the uplink. However, unlike the PRACH, this channel can be reserved for several frames, and fast power control is supported. Physical downlink shared channel (PDSCH) a shared physical channel supporting the DSCH transport channel on the downlink. It is used to
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(b) Figure 9.10. Multiplexing of DPDCH and DPCCH in downlink (a) and uplink (b).
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carry control information or bursty data and is shared by several designated users. It supports the use of fast power control, but there is no soft handoff for this channel. In addition, it supports a variable spreading factor on a frame-by-frame basis so that the bit rate is adaptive to the physical channel condition. The PDSCH must always be associated with a downlink DPCH to indicate which terminal should decode the information in the PDSCH and the associated spreading code. Since the information of the PDSCH is associated with a downlink DPCH, the PDSCH frame is not started before three timeslots after the end of the associated downlink DPCH. Dedicated physical channel (DPCH) a dedicated physical channel in both uplink and downlink used to support the DCH between the RNC and a speci c mobile terminal. Two subchannels constitute the DPCH: the Dedicated physical data channel (DPDCH) and the Dedicated physical control channel (DPCCH).The DPDCH carries the data part of the DCH, whereas the DPCCH carries the physical layer control information such as the fast power control commands, dedicated pilots, and the transport format combination indicator (TFCI).4 In the downlink, the DPDCH and the DPCCH are time-multiplexed and use normal QPSK modulation as illustrated in Figure 9.10a. The spreading factor of the DPCH does not
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TFCI is used at the receiving side to demultiplex data from a single CCTrCh into a number of transport channels on a frame-by-frame basis.
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(b) Figure 9.11. Tables of spreading factor and bit rates in uplink (a) and downlink (b) DPCH.
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vary on a frame-by-frame basis, and the data rate is varied by the rate matching operation by bit puncturing, bit repetition, or discontinuous transmission (DTX). In the uplink, the DPDCH and the DPCCH are I-Q multiplexed with different channelization codes cD and cC, respectively, as illustrated in Figure 9.10b. The DPCCH always has a xed spreading factor of 256, whereas the DPDCH has a variable spreading factor on a frame-by-frame basis (4 256). Figure 9.11 tabulates two sets of possible spreading factors and the associated bit rates of DPCH in the downlink and uplink.
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