002 WCDMA Radio Interface Physical Layer ISSUE 1.0

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Transcript of 002 WCDMA Radio Interface Physical Layer ISSUE 1.0

WCDMA Radio Interface Physical Layer

Huawei Technologies Co., Ltd.All rights reserved

WCDMA Radio Interface Physical Layer

Revision RecordDate 28-02-2010 Version 1A Change description Author Victor Toledo

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WCDMA Radio Interface Physical Layer

Table of Contents1 Physical layer Overview .......................................................................................................... 9 Protocol structure for radio interface ............................................................................... 10 Spreading technology...................................................................................................... 14 Channelization Codes ..................................................................................................... 15 Scrambling codes ............................................................................................................ 16 Physical layer key technology ............................................................................................. 19 Logical channels .............................................................................................................. 19 Transport channels .......................................................................................................... 21 Physical channel .............................................................................................................. 22 Cell broadcast channels ................................................................................................... 25 Paging channels ............................................................................................................... 29 Random access channels ................................................................................................ 32 Dedicated channels .......................................................................................................... 35 High speed downlink shared channels ............................................................................ 37 Channel mapping ............................................................................................................. 40 Physical layer processing procedure.................................................................................. 41 Coding and multiplexing technology ............................................................................... 41 Spreading technology ...................................................................................................... 47 Modulation technology ..................................................................................................... 50 Physical layer procedures .................................................................................................... 51 Cell search procedure ..................................................................................................... 51 Channel timing relationship ............................................................................................. 52 Random access procedure ............................................................................................. 53 Transmit Diversity Mode................................................................................................... 55 Transmit Diversity-STDD ................................................................................................. 56 Transmit Diversity TSTD .................................................................................................. 57 Closed Loop Mode ........................................................................................................... 58

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WCDMA Radio Interface Physical Layer

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WCDMA Radio Interface Physical Layer

ForewordThe physical layer offers data transport services to higher layers. The access to these services is through the use of transport channels via the MAC sub-layer. The physical layer is expected to perform the following functions in order to provide the data transport service, for example Modulation and spreading/demodulation and despreading, Inner - loop power control etc.

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WCDMA Radio Interface Physical Layer

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WCDMA Radio Interface Physical Layer

ObjectivesUpon completion of this course, you will be able to:

Understand radio interface protocol Architecture. Understand key technology of UMTS physical layer. Understand UMTS physical layer procedures.

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WCDMA Radio Interface Physical Layer

References

TS 25.104 UTRA (BS) FDD Radio Transmission and Reception TS 25.201 Physical layer-general description TS 25.211 Physical channels and mapping of transport channels onto physical channels (FDD) TS 25.212 Multiplexing and channel coding (FDD) TS 25.213 Spreading and modulation (FDD) TS 25.214 Physical layer procedures (FDD) TS 25.308 UTRA High Speed Downlink Packet Access (HSDPA); Overall description; Stage 2 TR 25.877 High Speed Downlink Packet Acces (HSDPA) - Iub/Iur Protocol Aspects TR 25.858 Physical layer aspects of UTRA High Speed Downlink Packet Access

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WCDMA Radio Interface Physical Layer

Physical Layer OverviewCore Network Iu RNS Iur RNC Iub Node B Iub Node B Iub Node B RNC Iub Node B RNS Iu

Figure 1.- UTRAN Protocol structure.

UTRAN:UMTS Terrestrial Radio Access Network. The UTRAN consists of a set of Radio Network Subsystems connected to the Core Network through the Iu. A RNS consists of a Radio Network Controller and one or more Node Bs. A Node B is connected to the RNC through the Iub interface. Inside the UTRAN, the RNCs of the Radio Network Subsystems can be interconnected together through the Iur. Iu(s) and Iur are logical interfaces. Iur can be conveyed over direct physical connection between RNCs or virtual networks using any suitable transport network.

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WCDMA Radio Interface Physical Layer

Protocol Structure for Radio Interface

Figure 2.- Radio Interface Protocol structure.

The radio interface (Uu) is layered into three protocol layers: the physical layer (L1) the data link layer (L2) the network layer (L3). The layer 1 supports all functions required for the transmission of bit streams on the physical medium. It is also in charge of measurements function consisting in indicating to higher layers, for example, Frame Error Rate (FER), Signal to Interference Ratio (SIR), interference power, transmit power. It is basically composed of a layer 1 management entity, a transport channel entity, and a physical channel entity. The layer 2 protocol is responsible for providing functions such as mapping, ciphering, retransmission and segmentation. It is made of four sublayers: MAC (Medium Access Control), RLC (Radio Link Control), PDCP (Packet Data Convergence Protocol) and BMC (Broadcast/Multicast Control). The layer 3 is split into 2 parts: the access stratum and the non access stratum. The access stratum part is made of RRC (Radio Resource Control) entity and duplication avoidance entity. The non access stratum part is made of CC, MM parts.

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WCDMA Radio Interface Physical Layer

Not shown on the figure are connections between RRC and all the other protocol layers (RLC, MAC, PDCP, BMC and L1), which provide local inter-layer control services. The protocol layers are located in the UE and the peer entities are in the node B or the RNC. Many functions are managed by the RRC layer. Here is the list of the most important: Establishment, re-establishment, maintenance and release of an RRC connection between the UE and UTRAN: it includes an optional cell re-selection, an admission control, and a layer 2 signaling link establishment. When a RNC is in charge of a specific connection towards a UE, it acts as the Serving RNC. Establishment, reconfiguration and release of Radio Bearers: a number of Radio Bearers can be established for a UE at the same time. These bearers are configured depending on the requested QoS. The RNC is also in charge of ensuring that the requested QoS can be met. Assignment, reconfiguration and release of radio resources for the RRC connection: it handles the assignment of radio resources (e.g. codes, shared channels). RRC communicates with the UE to indicate new resources allocation when handovers are managed. Paging/Notification: it broadcasts paging information from network to UEs. Broadcasting of information provided by the non-access stratum (Core Network) or access Stratum. This corresponds to system information regularly repeated. UE measurement reporting and control of the reporting: RRC indicates what to measure, when and how to report. Outer loop power control: controls setting of the target values. Control of ciphering: provides procedures for setting of ciphering.

The RRC layer is defined in the 25.331 specification from 3GPP. The RLCs main function is the transfer of data from either the user or the control plane over the Radio interface. Two different transfer modes are used: transparent and non-transparent. In non-transparent mode, 2 sub-modes are us