WCDMA
`FOR UMTS
`
`
`
`
`Radio Access For Third Generation
`Mobile Communications
`
`
`
`Revised edition
`
`Edited by
`Harri Holma and Antti Toskala
`
`Both of Nokia, Finland
`
`JOHN WILEY & SONS, LTD
`
`Chichester - New York - Weinheim - Brisbane - Singapore - Toronto
`
`Page 1 of 4
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`Ericsson v. IV, IPR2014-01195
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`ERIC-1032
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`ERIC-1032
`Ericsson v. IV, IPR2014-01195
`Page 1 of 4
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`Copyright © 2001 by John Wiley & Sons, Ltd,
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`A catalogue record for this book is available from the British Library
`
`ISBN 0 471 48687 6
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`
` WCDMA for UMTS
`
`the transport channels are described
`This chapter has been divided as follows. First,
`together with their mapping to different physical channels in Section 6.2. Spreading and
`modulation for uplink and downlink are presented in Section 6.3, and the physical channels
`for user data and control data are described in Sections 6.4 and 6.5. In Section 6.6 the
`key physical layer procedures, such as power control and handover measurements, are
`covered.
`
`
`
`6.2 Transport Channels and their Mapping to the Physical Channels
`In UTRA the data generated at higher layers is carried over the air with transport channels,
`which are mapped in the physical layer to different physical channels. The physical layer
`is required to support variable bit rate transport channels to offer bandwidth—on—demand
`services, and to be able to multiplex several services to one connection. This section
`presents the mapping of the transport channels to the physical channels, and how those
`two requirements are taken into account in the mapping.
`Each transport channel is accompanied by the Transport Format Indicator (TFI) at each
`time event at which data is expected to arrive for the specific transport channel from the
`higher layers. The physical layer combines the TFI information from different transport
`channels to the Transport Format Combination Indicator (TFCI). The TFCI is transmitted
`in the physical control channel to inform the receiver which transport channels are active
`for the current frame; the exception to this is the use of Blind Transport Format Detection
`(BTFD) that will be covered in connection with the downlink dedicated channels. The TFCI
`is decoded appropriately in the receiver and the resulting TFI is given to higher layers for
`each of the transport channels that can be active for the connection. In Figure 6.1 two
`transport channels are mapped to a single physical channel, and also error indication is
`
`Transport ch 1.
`A
`
`Transport ch 2.
`A
`
`F
`
`\ K
`
`\
`
`Transport block
`
`Transport block
`
`Transport block &
`Error indication
`
`Transport block &
`Error indication
`
`
`Error indicaiion
`TFI
`Error indication
`TFI Transport block
`I Transport block
`’ TFI
`X
`/7
`//
`//
`\\
`\\
`//
`//
`.
`\\
`\\
`,/
`\ /,
`\\
`\ I,’
`\
`/ Higher layers
`_———\: — — — — — — -—/—-,,\— - — — — — — ——/—,—’— — — — — — ——_ — _ — — _ — — __.¢ _ _ _ _ _ . _ _ -_}\_ _ _ _ _ _ _ _ _ _._/.4 _ _ _ _ _ __
`/ \
`Physical layer
`I,’ \\
`\
`/,
`\\
`//
`\\
`l//
`\\
`///
`\\
`I’
`\\
`[I
`\
`{ K
`{ K
`.
`.
`TFCI
`.
`Decoding
`Decoding & Demultiplexing
`
`\
`
`\
`
`7
`
`TFI
`
`TFCI
`
`-
`-
`-
`Coding 3: Multiplexing
`
`
`
`Transport block &
`
`Transport block &
`
`1
`
`X
`
`\__’
`
`K
`
`I
`
`
`
`Physical
`control ch
`
`Physical
`data ch
`
`TRANSMITTER
`
`I
`
`Physical
`control ch
`
`Physical
`data ch
`
`RECEIVER
`
`Figure 6.1. The interface between higher layers and the physical layer
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`
`WCDMA for UMTS
`
`iannels are described
`
`in 6.2. Spreading and
`the physical channels
`5. In Section 6.6 the
`ar measurements, are
`
`iysical Channels
`
`lth transport channels,
`ls. The physical layer
`>andwidth-on—demand
`nection. This section
`
`rmels, and how those
`
`idicator (TFI) at each
`)ort channel from the
`
`rm different transport
`e TFCI is transmitted
`rt channels are active
`)ort Format Detection
`d channels. The TFCI
`
`n to higher layers for
`in. In Figure 6.1 two
`so error indication is
`
`Transport block &
`Error indication
`
`TF1
`
`Transport block &
`Error indication
`,1//
`1
`_ _ _ _ _ _ _ __ 4: _ _ ._ ———
`//
`\
`//
`\
`/
`
`\
`
`/
`
`ding & Demultiplexing
`
`Physical
`data ch
`
`'ER
`
`ical layer
`
`Physical Layer
`
`71
`
`provided for each transport block. The transport channels may have a different number of
`blocks and at any moment not all the transport channels are necessarily active.
`One physical control channel and one or more physical data channels form a single
`Coded Composite Transport Channel (CCTrCh). There can be more than one CCTrCh on
`a given connection but only one physical layer control channel is transmitted in such a
`case.
`
`The interface between higher layers and the physical layer is less relevant for terminal
`implementation, since basically everything takes place within the same equipment, thus
`the interfacing here is rather a tool for specification work. For the network side the divi-
`sion of functions between physical and higher layers is more important, since there the
`interface between physical and higher layers is represented by the lub—interface between
`the base station and Radio Network Controller (RNC) as described in Chapter 5. In the
`3GPP specification the interfacing between physical layer and higher layers is covered
`in [6].
`
`Two types of transport channels exist: dedicated channels and common channels. The
`main difference between them is that a common channel is a resource divided between all
`or a group of users in a cell, whereas a dedicated channel resource, identified by a certain
`code on a certain frequency, is reserved for a single user only. The transport channels are
`compared in Section 10.3 for the transmission of packet data.
`
`6.2.] Dedicated Transport Channel
`
`The only dedicated transport channel is the dedicated channel, for which the term DCH is
`used in the 25—series of the UTRA specification. The dedicated transport channel carries all
`the information intended for the given user coming from layers above the physical layer,
`including data for the actual service as well as higher layer control information. The content
`of the information carried on the DCH is not visible to the physical layer, thus higher layer
`control information and user data are treated in the same way. Naturally the physical layer
`parameters set by UTRAN may vary between control and data.
`The familiar GSM channels, the traffic channel (TRCH) or associated control channel
`(ACCH), do not exist in UTRA physical layer. The dedicated transport channel carries
`both the service data, such as speech frames, and higher layer control information, such
`as handover commands or measurement reports from the terminal. In WCDMA a separate
`transport channel is not needed because of the support of variable bit rate and service
`‘i multiplexing.
`The dedicated transport channel is characterised by features such as fast power control,
`fast data rate change on a frame—by—frame basis, and the possibility of transmission to a
`certain part of the cell or sector with varying antenna weights with adaptive antenna systems.
`The dedicated channel supports soft handover.
`
`6.2.2 Common Transport Channels
`
`There are currently six different common transport channel types defined for UTRA, which
`are introduced in the following sections. There are a few differences from second generation
`systems, for example transmission of packet data on the common channels, and a downlink
`shared channel for transmitting packet data. Common channels do not have soft handover
`but some of them can have fast power control.
`
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