Understanding OFDMA Frame Structures in 4G and 5G Networks

Explore the distinct OFDMA frame structures in 4G and 5G networks, including frequency and time domain elements, resource allocation details, subcarrier spacing, RB allocation, numerology, and scalable subcarrier spacing. Learn about PDSCH resource allocation types, RBG configurations, and more through detailed images and descriptions.

• OFDMA
• 4G
• 5G
• Frame Structure
• Subcarrier

lazo_lky Follow

Uploaded on Dec 13, 2024 | 0 Views

Download Presentation

Please find below an Image/Link to download the presentation.

The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. Download presentation by click this link. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.

Presentation Transcript

1. 5G OFDMA Frame

2. 4G OFDMA Frame 3GPPTS 136.211 4G OFDMA Frame (Frequency Domain) (Time Domain) Resource Element (RE) 1 Subcarrier 1 Symbol Resource Block (RB) 12 Subcarriers 7 Symbols Subcarrier Spacing = 15 kHz 13

3. 5G OFDMA Frame 3GPP TS 138.211 Subframe duration 4G ( 1 msec) Resource Element (RE) 4G Resource Block (RB) 4G 12 Subcarriers ?(Starting Symbol Index) ? (Number of Consecutive Symbols) Numerology ( ) (Subcarrier Spacing) 14

4. Starting Symbol Index & Number of Consecutive Symbols PDSCH resource allocation TypeAfor slot-based Type B for mini-slot based (uRLLC) ? (Starting Symbol Index) Symbol ? (Number of Consecutive Symbols) Symbols PDSCH mapping type Normal cyclic prefix Extended cyclic prefix S L S+L S L S+L Type A {0,1,2,3} {3, ,14} {0,1,2,3} {3, ,14} {3, ,12} {3, ,12} Type B {0, ,12} {2,4,7} {0, ,10} {2,4,6} {2, ,14} {2, ,12} 15

5. RB Allocation in Frequency Domain (1/2) Type 0 RB 1 2 1 36 2 4 37 72 4 8 RBG (Resource Block Group) Bitmap RB RB (Bandwidth Part Size) (Configuration) 73 144 8 16 145 275 16 16 RB 1 2 (Bandwidth Part Size) RB 0 RBG 0 1 RBG 0 (Configuration) RRC (Radio Resource Control) ??? ???? 2 RBG 1 3 4 RBG 2 5 8 RBG 1 6 RBG 3 7 15

6. RB Allocation in Frequency Domain (2/2) Type 1 RB ???????(Starting RB) RB ????(ContiguouslyAllocated Resource Blocks) RB Type 0 Type 1 14 Type 0 RRC 1 RBG 2 RB Type 1 ???????= 4 ????= 9 15

7. (Numerology) 5G (< 6 GHz) (> 30-300 GHz) 3GPP (Numerology) (Subcarrier Spacing, SCS) Numerology Scalable Subcarrier Spacing ( ?) ? = 2? 15 ??? A numerology ( ) can define Subcarrier Spacing Cyclic Prefix (Specified but not supported in Release 15) 16

8. Scalable Subcarrier Spacing (Bandwidth) (Bandwidth) (Bandwidth) (Bandwidth) 17

9. Frame Structure 4G 5G Frame Subframe duration 4G 5G Slot Duration 4G Slot 7 Symbols 5G Slot 14 Symbols 5G Slot Duration Subcarrier spacing 5G Mini Slots uRLLC Symbols 2/4/7 Slot 18

10. 4G: RB Data Rate 4G : RB Data Rate =12 subcarriers 7 symbols ? (bits per symbol) 0.5 (slot duration) : Modulation 64 QAM Symbol 6 bits (? = log2?) Data Rate per RB = 12 7 6 0.5 ????= 1.008 Mbps 19

11. 5G: RB Data Rate 5G: RB Data Rate =12 subcarriers 1 symbol ? (bits per symbol) 1 2? 14(symbol duration) : Modulation 64 QAM Symbol 6 bits (? = log2?) RB Data Rates Subcarrier Spacing 15 kHz 30 kHz 60 kHz 120 kHz Symbol Duration 0.071 ms 0.036 ms 0.018 ms 0.009 ms Data Rate per RB 1.008 Mbps 2.016 Mbps 4.032 Mbps 8.064 Mbps 0 1 2 3 -1 20

12. 5G: RB Data Rate 1 subframe = 1 slot = 1ms Subcarrier Spacing = 15kHz 1 slot =14 symbol = 1ms Subcarrier Spacing 0 15 kHz 1 30 kHz 2 60 kHz 3 120 kHz Symbol Duration 0.071 ms 0.036 ms 0.018 ms 0.009 ms Data Rate per RB 1.008 Mbps 2.016 Mbps 4.032 Mbps 8.064 Mbps ?????????? = 2 0 15 ??? = 15 ??? ?????? ???????? = 1 ?? 14 ?????? = 0.071 ?? ???? ???? ??? ?? =12 1 6 0.071 = 1.008 ???? 21

13. 5G: RB Data Rate 1 subframe = 2 slot = 1 ms Subcarrier Spacing = 30 kHz 1 slot = 14 symbol = 0.5 ms Subcarrier Spacing 0 15 kHz 1 30 kHz 2 60 kHz 3 120 kHz Symbol Duration 0.071 ms 0.036 ms 0.018 ms 0.009 ms Data Rate per RB 1.008 Mbps 2.016 Mbps 4.032 Mbps 8.064 Mbps ?????????? = 2 1 15 ??? = 30 ??? ?????? ???????? = 1?? 28 ?????? = 0.036 ?? ???? ???? ??? ?? =12 1 6 = 2.016 ???? 0.036 22

14. 5G: RB Data Rate 1 subframe = 4 slot = 1 ms Subcarrier Spacing = 60 kHz 1 slot =14 symbol = 0.25 ms Subcarrier Spacing 0 15 kHz 1 30 kHz 2 60 kHz 3 120 kHz Symbol Duration 0.071 ms 0.036 ms 0.018 ms 0.009 ms Data Rate per RB 1.008 Mbps 2.016 Mbps 4.032 Mbps 8.064 Mbps ?????????? = 2 2 15 ??? = 60 ??? ?????? ???????? = 1 ?? 56 ?????? = 0.018 ?? ???? ???? ??? ?? =12 1 6 = 4.032 ???? 0.018 23

15. 5G: RB Data Rate 1 subframe = 8 slot = 1ms Subcarrier Spacing = 120 kHz 1 slot =14 symbol = 0.125 ms Subcarrier Spacing 0 15 kHz 1 30 kHz 2 60 kHz 3 120 kHz Symbol Duration 0.071 ms 0.036 ms 0.018 ms 0.009 ms Data Rate per RB 1.008 Mbps 2.016 Mbps 4.032 Mbps 8.064 Mbps ?????????? = 2 3 15 ??? = 120 ??? ?????? ???????? = 1 ?? 112 ?????? = 0.009?? ???? ???? ??? ?? =12 1 6 = 8.064 ???? 0.009 24