๐—ช๐—ต๐—ฎ๐˜ ๐—ถ๐˜€ ๐˜๐—ต๐—ฒ ๐—ฝ๐—ฟ๐—ถ๐—บ๐—ฎ๐—ฟ๐˜† ๐—ณ๐˜‚๐—ป๐—ฐ๐˜๐—ถ๐—ผ๐—ป ๐—ผ๐—ณ ๐—ฃ๐——๐—–๐—–๐—› ๐—ถ๐—ป ๐Ÿฑ๐—š โ“

๐—ช๐—ต๐—ฎ๐˜ ๐—ถ๐˜€ ๐˜๐—ต๐—ฒ ๐—ฝ๐—ฟ๐—ถ๐—บ๐—ฎ๐—ฟ๐˜† ๐—ณ๐˜‚๐—ป๐—ฐ๐˜๐—ถ๐—ผ๐—ป ๐—ผ๐—ณ ๐—ฃ๐——๐—–๐—–๐—› ๐—ถ๐—ป ๐Ÿฑ๐—š โ“

๐—ช๐—ต๐—ฎ๐˜ ๐—ถ๐˜€ ๐˜๐—ต๐—ฒ ๐—ฝ๐—ฟ๐—ถ๐—บ๐—ฎ๐—ฟ๐˜† ๐—ณ๐˜‚๐—ป๐—ฐ๐˜๐—ถ๐—ผ๐—ป ๐—ผ๐—ณ ๐—ฃ๐——๐—–๐—–๐—› ๐—ถ๐—ป ๐Ÿฑ๐—š โ“


โœ” Before going into details, You just need to understand that PDCCH is the heart of the Air-interface as it is being used to allocate and inform the UE about all the Scheduling information needed to start using any service.

โœ”In addition to this, Proper optimization of the PDCCH resources is one of the most vital parts of either 4G or 5G, As PDCCH ๐—ฐ๐—ผ๐—ป๐—ด๐—ฒ๐˜€๐˜๐—ถ๐—ผ๐—ป, ๐—ฏ๐—น๐—ผ๐—ฐ๐—ธ๐—ถ๐—ป๐—ด, ๐—ผ๐—ฟ ๐—ฐ๐—ผ๐˜ƒ๐—ฒ๐—ฟ๐—ฎ๐—ด๐—ฒ/๐—พ๐˜‚๐—ฎ๐—น๐—ถ๐˜๐˜† ๐—ถ๐˜€๐˜€๐˜‚๐—ฒ๐˜€(๐—›๐—ถ๐—ด๐—ต ๐—•๐—Ÿ๐—˜๐—ฅ) can have a severe impact on services such as ๐—ฉ๐—ผ๐—น๐˜๐—ฒ/๐—ฉ๐—ผ๐—ก๐—ฅ ๐—–๐—ฎ๐—น๐—น๐˜€ ๐—ฎ๐—ป๐—ฑ ๐—Ÿ๐—ฎ๐˜๐—ฒ๐—ป๐—ฐ๐˜†(Ex: Users will wait longer in the queue waiting for the scheduling information in case of congestion or Load imbalance between existing carriers in your network)

โœ” 5G PDCCH is mainly used ๐˜๐—ผ ๐˜๐—ฟ๐—ฎ๐—ป๐˜€๐—ณ๐—ฒ๐—ฟ ๐——๐—ผ๐˜„๐—ป๐—น๐—ถ๐—ป๐—ธ ๐—ฐ๐—ผ๐—ป๐˜๐—ฟ๐—ผ๐—น ๐—ถ๐—ป๐—ณ๐—ผ๐—ฟ๐—บ๐—ฎ๐˜๐—ถ๐—ผ๐—ป (๐——๐—–๐—œ), which is the same function is 4G. Where it includes Downlink grants, Uplink grants & Transmit power Control commands.

โœ” DCI provides the UE ๐˜„๐—ถ๐˜๐—ต ๐˜๐—ต๐—ฒ ๐—ป๐—ฒ๐—ฐ๐—ฒ๐˜€๐˜€๐—ฎ๐—ฟ๐˜† ๐—ฆ๐—ฐ๐—ต๐—ฒ๐—ฑ๐˜‚๐—น๐—ถ๐—ป๐—ด ๐—ถ๐—ป๐—ณ๐—ผ๐—ฟ๐—บ๐—ฎ๐˜๐—ถ๐—ผ๐—ป, such as DL/UL resource allocation and UE Common group signaling.

โœ” DCI provides resource allocation information for applications such as ๐—ฆ๐—œ๐—•๐Ÿญ, ๐— ๐—ฆ๐—š๐Ÿฎ/๐Ÿฏ/๐Ÿฐ, ๐—ฃ๐—ฎ๐—ด๐—ถ๐—ป๐—ด, ๐—ฎ๐—ป๐—ฑ ๐—จ๐—˜ ๐——๐—ฎ๐˜๐—ฎ ๐—ง๐—ฟ๐—ฎ๐—ป๐˜€๐—ณ๐—ฒ๐—ฟ.



๐Ÿ“š Simply, Resource allocation information means to inform the ๐—จ๐˜€๐—ฒ๐—ฟ ๐—ฎ๐—ฏ๐—ผ๐˜‚๐˜ ๐˜๐—ต๐—ฒ ๐—ฆ๐—ฒ๐˜ ๐—ผ๐—ณ ๐—™๐—ฟ๐—ฒ๐—พ๐˜‚๐—ฒ๐—ป๐—ฐ๐˜† ๐—ฟ๐—ฒ๐˜€๐—ผ๐˜‚๐—ฟ๐—ฐ๐—ฒ๐˜€ ๐—ป๐—ฒ๐—ฒ๐—ฑ๐—ฒ๐—ฑ, such as the ๐—ป๐˜‚๐—บ๐—ฏ๐—ฒ๐—ฟ ๐—ผ๐—ณ ๐—ฟ๐—ฒ๐˜€๐—ผ๐˜‚๐—ฟ๐—ฐ๐—ฒ ๐—ฏ๐—น๐—ผ๐—ฐ๐—ธ๐˜€ required and the location of these RBs in the frequency and time domain; in addition to this, it also informs the User about the ๐— ๐—–๐—ฆ ๐—ง๐—ฎ๐—ฏ๐—น๐—ฒ (๐Ÿฒ๐Ÿฐ๐—ค๐—”๐—  ๐—ผ๐—ฟ ๐Ÿฎ๐Ÿฑ๐Ÿฒ๐—ค๐—”๐— ) to be used and other information ๐—ฎ๐—ฏ๐—ผ๐˜‚๐˜ ๐—›๐—”๐—ฅ๐—ค ๐—ณ๐—ฒ๐—ฒ๐—ฑ๐—ฏ๐—ฎ๐—ฐ๐—ธ. (Examples added in below figure for visual understanding)


๐——๐—ฎ๐˜๐—ฎ ๐—ฆ๐—ผ๐˜‚๐—ฟ๐—ฐ๐—ฒ:
- 5G NR in Bullets
- 5G Next generation wireless access technology

Refer to below youtube video for more details

google.com, pub-5422673343228309, DIRECT, f08c47fec0942fa0