WCDMA Power and Scrambling Code Planning

Click here to load reader

  • date post

    26-Oct-2014
  • Category

    Documents

  • view

    99
  • download

    7

Embed Size (px)

Transcript of WCDMA Power and Scrambling Code Planning

Internal

WCDMA Power and Scrambling Code Planningwww.huawei.com

HUAWEI TECHNOLOGIES CO., LTD.

All rights reserved

Chapter 1 Physical Layer Overview Chapter 2 Power Planning Chapter 3 Scrambling Code Planning

HUAWEI TECHNOLOGIES CO., LTD.

All rights reserved

Page 1

Radio Interface Protocol StructureGC Nt DC Duplication avoidance GC C plane C-plane signaling Nt DC U-plane U plane information UuS boundary

RRC contro ol ol contro control control

control

L3 Radio Bearers PDCP PDCP BMC L2/PDCP L2/BMC

RLC

RLC

RLC

RLC RLC RLC RLC

RLC

L2/RLC

Logical Channels MAC L2/MAC Transport Channels L1

PHY

HUAWEI TECHNOLOGIES CO., LTD.

All rights reserved

Page 2

WCDMA Radio Interface has three kinds of channelsIn terms of protocol layer, the WCDMA radio interface has three channels: Physical channel transport channel and logical channel channel, channel. Logical channel: Carrying user services directly. According to the types of the carried services, it is divided into two types: Control channel and service channel channel. Transport channel: It is the interface of radio interface layer 2 and physical layer, and is the service provided for MAC layer by the physical l h i l layer. A According t whether th i f di to h th the information t ti transported i t d is dedicated information for a user or common information for all users, it is divided into dedicated channel and common channel. Physical channel: It is the ultimate embodiment of all kinds of information when they are transmitted on radio interfaces. Each kind of channel which uses dedicated carrier frequency, code (spreading code and scramble) and carrier phase (I or Q) can b regarded as a d bl ) d i h be d d dedicated channel.

HUAWEI TECHNOLOGIES CO., LTD.

All rights reserved

Page 3

Radio Interface Channel Organisation

HUAWEI TECHNOLOGIES CO., LTD.

All rights reserved

Logical ChannelDedicated traffic channel Common traffic channel (DTCH) (CTCH) Traffic h T ffi channel l

Broadcast control channel Paging control channel Dedicate control channel Common control channel

(BCCH) (PCCH) (DCCH) (CCCH) Control channel

HUAWEI TECHNOLOGIES CO., LTD.

All rights reserved

Page 5

Transport ChannelDedicated Channel (DCH)

-DCH is an uplink or downlink channel

Dedicated transport channel

Broadcast channel B d t h l Forward access channel Paging channel Random access channel

(BCH) (FACH) (PCH) (RACH) Common transport channel

High-speed downlink shared channel (HS-DSCH)

HUAWEI TECHNOLOGIES CO., LTD.

All rights reserved

Page 6

Physical ChannelA physical channel is defined by a specific carrier frequency, code (scrambling code, spreading code) and relative phase. In UMTS system, the different code (scrambling code or spreading code) can di ti d ) distinguish th channels. i h the h l Most channels consist of radio frames and time slots, and each radio frame consists of 15 time slots slots. Two types of physical channel: UL and DL Physical Channel

Frequency, Code, Phase q y

HUAWEI TECHNOLOGIES CO., LTD.

All rights reserved

Page 7

Downlink Physical ChannelDownlink Dedicated Physical Channel

(Downlink DPCH)Downlink C D li k Common Ph i l Ch Physical Channel l

Common Control Physical Channel (CCPCH) Synchronization Channel y Paging Indicator Channel Acquisition Indicator Channel Common Pilot Channel ( (SCH) ) (PICH) (AICH) (CPICH)

Downlink Physical Channel

High-Speed Packet Downlink Shared Channel (HS-PDSCH) High-Speed Shared Control Channel (HS-SCCH)

HUAWEI TECHNOLOGIES CO., LTD.

All rights reserved

Page 8

Uplink Physical Channel p yUplink Dedicated Physical Channel Uplink Dedicated Physical Data Channel (Uplink DPDCH) Uplink Dedicated Physical Control p y Channel (Uplink DPCCH) High-Speed Dedicated Physical Channel (HS-DPCCH) Uplink Physical Channel Ch l

Uplink Common Physical Channel Physical Random Access Channel (PRACH)

HUAWEI TECHNOLOGIES CO., LTD.

All rights reserved

Page 9

Channel Mapping DLLogical L i l Channels Transport Channels Physical Channels

P-SCH S-SCH CPICH

BCCH PCCH CCCH

BCH PCH

P-CCPCH P CCPCH S-CCPCH PICH

FACH CTCH DCCH DTCHHUAWEI TECHNOLOGIES CO., LTD.

AICH HS-PDSCH

DSCH DCHAll rights reserved

DPDCH DPCCH

Channel Mapping ULLogical Channels Transport Channels Physical Channels

CCCH

RACH

PRACH

DCCH

CPCH

PCPCH

DTCH

DCH

DPDCH I branch DPCCH Q branch

HUAWEI TECHNOLOGIES CO., LTD.

All rights reserved

Function of physical channelSynchronization& Cell broadcast channels to all UE in a cellP-CPICH-Primary Common Pilot Channel S-CPICH-Secondary Common Pilot Channel P-CCPCH-Primary P CCPCH Primary Common Control Physical Channel SCH- Synchronisation Channel (Including P-SCH and S-SCH Channel)

Paging channelsS-CCPCH-Secondary Common Control Physical Channel PICH-Paging Indicator Channel

Random access channelsPRACH-Physical Random Access Channel

Node B

AICH-Acquisition Indicator Channel

UE

Dedicated channelsDPDCH-Dedicated Physical Data Channel DPCCH-Dedicated Physical Control Channel

High speed downlink share channelsHS-SCCH-High Speed Share Control Channel HS-PDSCH-High Speed Physical Downlink Share Channel HS-DPCCH-High Speed Dedicated Physical Control Channel

HUAWEI TECHNOLOGIES CO., LTD.

All rights reserved

Page 12

UE Acquisition and SynchronizationInitial Cell Synchronization

UE Monitor Primary SCH Code, detect peak in matched filter output Slot Synchronization Determined UE Monitor Secondary SCH Code, detect Scrambling Code Group and frame start time offset

P-SCH S-SCH S SCH CPICH

Frame Synchronization and Scrambling Code Group Determined

UE determines Scrambling Code by correlating all possible codes in group Scrambling Code Determined UE Monitors and decodes BCH data BCH data, Super frame synchronization determined data Super-frame UE adjust transmit timing to match timing of BS

P-CCPCH

Cell Synchronization complete This procedure is applied whenever a UE needs to access a cell or measure the q p pp quality of a cell, i.e. during cell y , g selection, cell re-selection and soft handover HUAWEI TECHNOLOGIES CO., LTD. All rights reserved

Physical Channel(DL) Transmission Timing

HUAWEI TECHNOLOGIES CO., LTD.

All rights reserved

Page 14

Primary Synchronization Channel (P-SCH)Used f U d for cell search and synchronization ll h d h i ti Two sub channels: P-SCH and S-SCH. SCH is transmitted at the first 10% of (256 chips) of e er time slot every slot. PSC is transmitted repeatedly in each time slot. SSC specifies the scrambling code groups of the cell. SSC is chosen from a set of 16 different codes of length 256 there 256, are altogether 64 primary scrambling code groups.

Slot #0

Slot #1

Slot #14

Primary SCH Secondary SCH

ac pi,0

ac pi,1

ac pi,14

ac s

ac s

acs

256 chips 2560 chips One 10 ms SCH radio frame

HUAWEI TECHNOLOGIES CO., LTD.

All rights reserved

Page 15

Cell SynchronisationCell synchronisation is achieved with the Synchronisation Channel (SCH). This channel divides up into two sub-channels: 1. 1 Primary Synchronisation Channel (P-SCH) (SLOT and CHIP SYNCHRONIZATION)A Primary Synchronisation Code (PSC) is transmitted the first 256 chips of a time slot. This is the case in every UMTS cell. If the UE detects the PSC, it has performed TS and chip synchronisation. This is typically done with a single matched filter matched to the primary synchronization code which is common for all cells cells. The slot timing of the cell can be obtained by decoding peaks in the matched filter output

HUAWEI TECHNOLOGIES CO., LTD.

All rights reserved

Cell Synchronisation2. Secondary Synchronisation Channel ( y y (S-SCH) (FRAME SYNCH and Scrambling Code Group )( g pDETECTION) The S-SCH also uses only the first 10% of a timeslot. There are 16 different SSCs, which are organised in a 10 ms frame (15 timeslots), giving us a sequence of 15 SSCs. There is a total of 64 different sequences of 15 SSCs, corresponding to the 64 primary scrambling code g p p g p y g groups.Scrambling Code Group Group 0 Group 1 Group 2 Group 3 Group 4 Group 61 Group 62 Group 63 p #0 1 1 1 1 1 9 9 9 #1 1 1 2 2 2 10 11 12 #2 2 5 1 3 16 13 12 10 #3 8 16 15 1 6 10 15 15 #4 9 7 5 8 6 11 12 13 #5 10 3 5 6 11 15 9 14 slot number #6 #7 #8 15 8 10 14 16 3 12 16 6 5 2 5 15 5 12 15 13 9 9 13 14 16 11 15 #9 16 10 11 8 1 12 14 11 #10 #11 #12 #13 #14 2 7 15 7 16 5 12 14 12 10 2 16 11 15 12 4 4 6 3 7 15 12 16 11 2 14 10 11 13 16 13 16 15 12 14 14 16 11 16 10

The beginning of a 10 ms frame can be determined (frame synchronization) based on sequence of SSC 64 different SSC combinations within 10ms are identified The unique combination of SSCs identify the Scrambling Code Group

Slot # ? Slot #? P-SCH P SCH S-SCH

Slot #?

acp 16

acp 6

acp 11

..

256 chips 2560 chips

Group 2 Slot 7, 8, 9All rights reserved

HUAWEI TECHNOLOGIES CO., LTD.

Scrambling CodeScrambling code: Gold sequence. Scrambling code period: 10ms (38400 chips). The code used for scrambling of the uplink DPCCH/DPDCH may be of g yp g p either long or short type, There are 224 long and 224 short uplink scrambling codes. Upli