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Resource Allocation in LTE
 

Resource Allocation in LTE

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    Resource Allocation in LTE Resource Allocation in LTE Presentation Transcript

    • Resource Allocation in LTE Gwanmo Ku Adaptive Signal Processing and Information Theory Research Group Nov. 11, 2011
    • Outline 2/33Resources in LTE Resource Grid, Resource Block, Slot, Sub-frameControl Information Physical Channels, PDCCH, DCIResource Allocation Resource Block Group (RBG) based RBG Subset based Virtual Resource Block (VRB)-basedReferences
    • 2/11Resource in LTE
    • Resource in LTE 4/33 Resource Used Subcarriers System BW [MHz] 1.4 3 5 10 15 20 Resource Blocks 6 15 25 50 75 100 FFT Size 2048 / 4096 ( / ) Subcarriers per RB 12 / 24 ( / ) Used Subcarriers 72 / 144 180 / 360 300 / 600 600 / 1200 900 / 1800 1200 / 2400 ( / ) ( for UL, for DL)
    • Resource Grid 5/33 Resource Grid, Slot, Sub-frame D L/U L User Assign Configuration
    • Resource Block 6/33 Resource Block Parameters CP Type Parameter Normal CP 7 7 12 6 6 Extended CP 3 - 24
    • 2/11Control Information
    • Physical Channels 8/33 Physical Channels Uplink Physical Channels CQI RequestMulticasting PCFICH UL Scheduling PUCCH PMCH PDCCH Information PDCCH DCI UL Power ControlBroadcasting DL Scheduling PUSCH PDSCH PBCH Data Data PRACH PHICH Random Access HARQ Retransmission Downlink Physical Channels
    • Control & Data Regions 9/33 Control & Data Region in a DL Sub-frame PRB Slot 2i Slot 2i+1 PCFICH PDCCH PDSCHInformation Sub-frame i of the length of Control Region PRB 1 PRB 0 Control Region Data Region
    • Control Region Mapping 10/33 Resource Element Group (REG) Used for defining the Control Channel Mapping PRB REG REG REG REG REG Data REG REG REG PRB 0 REG REG REG REG REG Data REG REG REG Sym. 0 Sym. 1 Sym. 2
    • PDCCH 11/33Supported PDCCHPDCCH Format Number of CCEs # Resource Element Group # PDCCH bits 0 1 9 72 1 2 18 144 2 4 36 288 3 8 72 576 CCE (Control Channel Element) Consist of 9 REG
    • PDCCH Mapping 12/33
    • User Identification using DCI Scrambling 13/33 Whose PDCCH (User Identification)? With RNTI (Radio Network Temporary Identifier) : User Identification DCI CRC A ttachment DCI + 16 bit CRC scrambled with RNTI DCI (DCI + RNTI)mod2
    • 2/11Resource Allocation
    • Resource Allocations 15/33 Resource Allocation & DCI Formats Resource Allocation Purpose DCI Format Resource Block Group (RBG) based 1 Type 0 RBG based (MIMO : Closed Loop) 2 RBG based (MIMO : Open Loop) 2A Selected RBG Subset based 1 Type 1 Selected RBG Subset based (MIMO : Closed Loop) 2 DL Scheduling Selected RBG Subset based (MIMO Open Loop) 2A VRB based Compact Scheduling + Random Access 1A VRB based Compact Scheduling with MIMO 1B Type 2 VRB based Very Compact Scheduling 1C VRB based Compact Scheduling with MIMO & Power Offset 1D UL Scheduling VRB based UL Scheduling 0 (Reference : pp. 22-25 3GPP TS 36.213 V8.8.0 (2009-09))
    • Resource Allocation : DL Type 0 33/16 Resource Block Groups (RBG) based System BW RGB Size (P) 10 1 PRB 99 P 11-26 2 PRB 98 RBG 24 PRB 97 27-63 3 PRB 96 64-110 4 PRB 7 Allocate Users 25 RBGs PRB 6 RBG 1 PRB 5 PRB 4 PRB 3 PRB 2 RBG 0 PRB 1 PRB 0 Example : 20MHz BW, 15 KHz , Normal CP (Reference : p. 22 3GPP TS 36.213 V8.8.0 (2009-09))
    • DL Type 0 (DL Scheduling) 17/33 DCI Format 1 Bits Field 1 Resource Allocation Header: Resource Allocation Type 0 or 1 Resource Assignment 5 MCS 3 or 4 HARQ Process : 3 for FDD, 4 for TDD 1 New Data Indicator 2 Redundancy Version 2 UL Power Control (PUCCH) 2 Downlink Assignment Index : TDD (Reference : pp. 44-45 3GPP TS 36.212 V8.8.0 (2009-12))
    • DL Type 0 (DL Scheduling with Closed Loop MIMO) 18/33 DCI Format 2 Bits Field 1 Resource allocation header : Resource Allocation Type 0 or type 1 Resource Block Assignment 2 UL Power Control (PUCCH) 2 Downlink Assignment Index (TDD, Not FDD) 3 or 4 HARQ process number : 3 bits (FDD), 4 bits (TDD) 1 Transport block to codeword swap flag For transport block 1 & 2 5 bits : MCS 8+8 1 bit : New data indicator 2 bits : Redundancy version 3 or 6 Closed Loop MIMO : 3 (# Ant. ports 2), 6 (# Ant. ports 4) (Reference : pp. 49-53 3GPP TS 36.212 V8.8.0 (2009-12))
    • DL Type 0 (DL Scheduling with Open Loop MIMO) 19/33 DCI Format 2A Bits Field 1 Resource allocation header : Resource Allocation Type 0 or type 1 Resource Block Assignment 2 UL Power Control (PUCCH) 2 Downlink Assignment Index (TDD, Not FDD) 3 or 4 HARQ process number : 3 bits (FDD), 4 bits (TDD) 1 Transport block to codeword swap flag For transport block 1 & 2 5 bits : MCS 8+8 1 bit : New data indicator 2 bits : Redundancy version 0 or 2 Open Loop MIMO : 0 (# Ant. ports 2), 2 (# Ant. ports 4) (Reference : pp. 53-55 3GPP TS 36.212 V8.8.0 (2009-12))
    • Resource Allocation : DL Type 1 20/33 Resource Block Groups Subset-based RBG 24 RBG subset 0 RBG 23 RBG subset 3 Each subsets of PRBs from one of RGB Subset P RBG 4 RBG subset 0 Set of PRBs from Subset 0 RBG subset 3 Set of PRBs from Subset 3 RBG 3 RBG 2 RBG subset 2 RBG 1 RBG subset 1 RBG 0 RBG subset 0 Example : 20MHz BW, 15 KHz , Normal CP (Reference : p. 23 3GPP TS 36.213 V8.8.0 (2009-09))
    • DL Type 1 (DL Scheduling) 21/33 DCI Format 1 Bits Field 1 Resource Allocation Header : Resource Allocation Type 0 or 1 - bits : indicate Selected Resource Block Subset - 1 bits : indicate a shift of resource allocation span - bits : Resource Assignment 5 MCS 3 or 4 HARQ Process : 3 for FDD, 4 for TDD 1 New Data Indicator 2 Redundancy Version 2 UL Power Control (PUCCH) 2 Downlink Assignment Index : TDD (Reference : pp. 44-45 3GPP TS 36.212 V8.8.0 (2009-12))
    • DL Type 1 (DL Scheduling with Closed Loop MIMO) 22/33 DCI Format 2 Bits Field 1 Resource allocation header : Resource Allocation Type 0 or type 1 - bits : indicate Selected Resource Block Subset - 1 bits : indicate a shift of resource allocation span - bits : Resource Assignment 2 UL Power Control (PUCCH) 2 Downlink Assignment Index (TDD, Not FDD) 3 or 4 HARQ process number : 3 bits (FDD), 4 bits (TDD) 1 Transport block to codeword swap flag For transport block 1 & 2 5 bits : MCS 16 1 bit : New data indicator 2 bits : Redundancy version 3 or 6 Closed Loop MIMO : 3 (# Ant. ports 2), 6 (# Ant. ports 4) (Reference : pp. 49-53 3GPP TS 36.212 V8.8.0 (2009-12))
    • DL Type 1 (DL Scheduling with Open Loop MIMO) 23/33 DCI Format 2A Bits Field 1 Resource allocation header : Resource Allocation Type 0 or 1 - bits : indicate Selected Resource Block Subset - 1 bits : indicate a shift of resource allocation span - bits : Resource Assignment 2 UL Power Control (PUCCH) 2 Downlink Assignment Index (TDD, Not FDD) 3 or 4 HARQ process number : 3 bits (FDD), 4 bits (TDD) 1 Transport block to codeword swap flag For transport block 1 & 2 5 bits : MCS 16 1 bit : New data indicator 2 bits : Redundancy version 0 or 2 Open Loop MIMO : 0 (# Ant. ports 2), 2 (# Ant. ports 4) (Reference : pp. 53-55 3GPP TS 36.212 V8.8.0 (2009-12))
    • Resource Allocation : DL Type 2 24/33 Virtual Resource Block (VRB) based Hopping or Non-hopping PRB 99 VRB 99 PRB 98 VRB 98 PRB 4 VRB 4 Allocate Users Contiguous VRBs PRB 3 VRB 3 PRB 2 VRB 2 PRB 1 VRB 1 PRB 0 VRB 0 (Reference : p. 24 3GPP TS 36.213 V8.8.0 (2009-09))
    • DL Type 2 (DL Compact Scheduling + Random Access) 25/33 DCI Format 1A Bits Field 1 Format Flag : Format 0 or 1A Random Access Initiated - 1 bit : 0 (Localized) Case 1 - bits : Resource Assignment : all bits 1 Setting - 6 bits : Preamble Index - 4 bits : PRACH Mask Index - 1 bit : Localized/Distributed VRB assignment flag - bits : Resource block assignment - 5 bits : MCS Case 2 - 3 or 4 bits : HARQ process number : 3 bits (FDD) , 4 bits (TDD) - 1 bit : New data indicator - 2 bits : Redundancy version - 2 bits : UL Power Control (PUCCH) - 2 bits : Downlink Assignment Index (TDD, not FDD) (Reference : pp. 45-46 3GPP TS 36.212 V8.8.0 (2009-12))
    • DL Type 2 (DL Compact Scheduling + MIMO) 26/33 DCI Format 1B Bits Field 1 Localized/Distributed VRB assignment flag Resource block assignment 5 MCS 3 or 4 HARQ process number : 3 bits (FDD), 4 bits (TDD) 1 New data indicator 2 Redundancy version 2 UL Power Control (PUCCH) 2 Downlink Assignment Index : TDD 2 or 4 MIMO (TPMI) : 2 (# Ant. 2), 4 (# Ant. 4) 1 MIMO (PMI) (Reference : pp. 47-48 3GPP TS 36.212 V8.8.0 (2009-12))
    • DL Type 2 (DL Very Compact Scheduling) 27/33 DCI Format 1C Bits Field 1 Gap value Resource Assignment : bits 5 Transport Block Size (Reference : p. 48 3GPP TS 36.212 V8.8.0 (2009-12))
    • DL Type 2 (DL Compact Scheduling, MIMO, Power Offset) 28/33 DCI Format 1D Bits Field 1 Localized/Distributed VRB assignment flag Resource block assignment 5 MCS 3 or 4 HARQ process number : 3 bits (FDD), 4 bits (TDD) 1 New data indicator 2 Redundancy version 2 UL Power Control (PUCCH) 2 Downlink Assignment Index (TDD, not FDD) 2 or 4 MIMO (TPMI) : 2 (# Ant. 2), 4 (# Ant. 4) 1 MIMO (PMI) 1 Downlink power offset (Reference : pp. 48-49 3GPP TS 36.212 V8.8.0 (2009-12))
    • Resource Allocation : UL Type 29/33 Virtual Resource Block (VRB) based Hopping or Non-hopping PRB 99 VRB 99 PRB 98 VRB 98 PRB 4 VRB 4 Allocate Users Contiguous VRBs PRB 3 VRB 3 PRB 2 VRB 2 PRB 1 VRB 1 PRB 0 VRB 0 (Reference : p. 55 3GPP TS 36.213 V8.8.0 (2009-09))
    • Resource Allocation (UL Scheduling) 30/33 DCI Format 0 Bits Field 1 Format Flag : Format 0 or 1A 1 Hopping Flag : Non-hopping or Hopping - Hopping bits : Hopping Location In formation bits : Resource Assignment - Non Hopping : bits : Resource Assignment 5 MCS 1 New Data Indicator 2 UL Power Control (PUSCH) 3 Cyclic Shift for DM RS 2 UL Index : TDD 2 Downlink Assignment Index : TDD 1 CQI Request (Reference : pp. 43-44 3GPP TS 36.212 V8.8.0 (2009-12))
    • Other DCI Formats 31/33 Format 3 Transmission of TPC commands for PUCCH and PUSCH with 2-bit power adjustments Format 3A Transmission of TPC commands for PUCCH and PUSCH with single bit power adjustments (Reference : p. 55 3GPP TS 36.212 V8.8.0 (2009-12))
    • 2/11References
    • References 33/33 TS 36.101 V8.15.0 UE Radio Transmission and Reception TS 36.104 V8.12.0 BS Radio Transmission and Reception TS 36.201 V8.3.0 LTE PHY General Description TS 36.211 V8.9.0 Physical Channels and Modulation TS 36.212 V8.8.0 Multiplexing and Channel Coding TS 36.213 V8.8.0 Physical Procedures