Session 02/10 : 5G NR Scheduling Options for Low Latency URLLC use-case & Mobile Broadband use-case

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Explore how 5G NR (New Radio) adapts its scheduling techniques for different use cases, from mobile broadband to ultra-low latency applications. This video breaks down how the g-Node-B and UE communicate efficiently for both downlink and uplink, using dynamic and semi-persistent scheduling, while ensuring low latency data transfer through configured grants.  Scheduling Options: * Downlink: Dynamic Scheduling vs. Semi-Persistent Scheduling (SPS) * Uplink: Dynamic Scheduling vs. Configured Grant (Type 1 and Type 2)  Key Concepts: * How g-Node-B informs the UE for mobile broadband data * Low latency data handling with periodic communication * Uplink dynamic scheduling and its limitations for low latency * Configured Grant Type 1 and Type 2 explained for faster uplink communication  Why It's Important: * Achieve faster communication in low-latency use cases * Understand how periodic data scheduling helps URLLC * Optimize resource allocation for uplink transmissions   Learn how 5G scheduling options reduce latency, ensuring better performance for mobile broadband and critical communications.   Subscribe to "Learn And Grow Community"  YouTube : https://www.youtube.com/@LearnAndGrowCommunity LinkedIn Group : https://linkedin.com/company/LearnAndGrowCommunity Follow #learnandgrowcommunity       #5gnr  #lowlatency  #mobilebroadband  #SemiPersistentScheduling #ConfiguredGrant #urllc  #5GScheduling #UplinkScheduling #DownlinkScheduling #wirelesstech  #5gtechnology #5g #5gnetwork #5gran #5gcore #5gconnectivity #5grevolution #newradio #radioaccessnetwork #3gpp #scheduling #downlink #uplinkscheduling #nr #4gvs5g #5gvs4g #4g #lte #lte5g #mobilebroadband #telecom #telecominsights #signaling #PDCCH #PUCCH #controlchannel #PUSCH #PDSCH

Transcript

00:00Hi, in the last session, we talked about the mini slots

00:03and preemptive scheduling.

00:05And we understand that how mini slots and preemptive scheduling

00:09in 5G NR helps to serve URLLC use cases

00:13and how they contribute in achieving the low latency

00:16requirements for the next generation applications.

00:20Now, in this session, we'll be discussing 5G NR scheduling.

00:24In 5G NR, scheduling options are specifically

00:28designed to meet the wide needs of various use cases,

00:31from mobile broadband to low latency applications.

00:35Let's start from the downlink scheduling options.

00:38So we have two scheduling options

00:40for downlink data transmission.

00:42One is for mobile broadband, and another

00:44is for low latency communication.

00:47For mobile broadband data, whenever

00:49there is a downlink data to send,

00:51the gNodeB informs the UA through the downlink control

00:54information and then sends the data.

00:57However, this approach may be too slow for the low latency

01:01data transmissions.

01:02So low latency transmissions occurs periodically.

01:06So instead of DCI, an RRC message

01:09is used to define this periodicity.

01:12And at that period, the UA can receive the data

01:15without any further notifications.

01:18And this technique is called semi-persistent scheduling,

01:21SPS or SPI.

01:24And it is important for maintaining

01:26that low latency in periodic data transmissions.

01:29Now let's look at the uplink scheduling.

01:32So this is for broadband data transfer in uplink.

01:35When there is an uplink data to send,

01:37then first, UA will transmit the scheduling request

01:40to the base station.

01:42Then the base station responds to that request

01:45by sending a scheduling grant.

01:47And that passes through a PDCCH, or Physical Downlink Control

01:51Channel.

01:52Then the UA will respond to this grant

01:55by transmitting its data on the PUSCH, or Physical Uplink

01:59Shared Channel.

02:01This method is called dynamic scheduling.

02:04So this whole process can have higher latency

02:07because all the uplink transmissions are orthogonal.

02:10This means that two UEs cannot transmit their data

02:14simultaneously on the same resources.

02:17This is needed so that uplink transmissions do not

02:19interfere with each other.

02:21And hence, each UE is assigned by unique resources.

02:25And because of this, UE needs to rely on the base station

02:29to assign the resources to them.

02:31And that leads to the increased latency.

02:35This method of requesting and receiving a grant

02:38works well for the broadband data, where latency

02:41is not that much critical.

02:43But for the low latency requirement,

02:45this request and grant process is a little bit long.

02:49And it takes several milliseconds

02:51from the initial scheduling request

02:52to the final data transmission.

02:54And hence, for the low latency use cases,

02:575G NR introduces a more efficient technique

03:00called as configured grant, or configured scheduling.

03:04Now, configured grant comes in two variants.

03:07And each one is designed for different type of uplink data

03:10needs.

03:11Type 1 is ideal for the UEs which

03:14have periodic data to send.

03:17In such use cases, the network can

03:19grant the periodic uplink resources to the UE.

03:22So there is no need to request a grant every time.

03:26Whenever the UE has data to send,

03:28it can immediately transmit that using these pre-configured

03:32resources without the need of dynamic uplink grant.

03:36This approach significantly reduces the uplink latency

03:40and make it crucial for the applications

03:42with stringent latency requirements.

03:45But what if the data is not periodic?

03:48In such cases, periodic resource allocations

03:50could lead to inefficiencies.

03:53And it will waste the network resources.

03:56So this brings us to the type 2 configured grant.

03:59With type 2, uplink resources are still

04:02granted periodically, just like we discussed in type 1.

04:06But now, in this type 2, PDCCH will

04:09be used as dynamically activate or deactivate these grants

04:13based on their needs.

04:15So depending on the packet arrival time,

04:17the PDCCH can be used to adjust the fraction of grants that

04:21are actively used, although this approach increases

04:25the signaling overhead on the PDCCH.

04:28But it enhances the efficiency and minimizes

04:31the resource wastage.

04:33OK, so that's it for today.

04:35It was just a brief, as this series

04:37is focused to introduce different concepts of 5G NR.

04:40In the next session, we'll be talking about quality

04:43of services in 5G NR.

04:44So stay tuned for the updates.

04:46If you did not subscribe till now,

04:48then please do subscribe to learn and grow

04:50community for regular updates.

04:52If this video is informative, then please like this video,

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