Different types of scheduler in LTE

Today we will discuss about the different types of schedulers in LTE.
There are mainly 3 types of schedulers in LTE, which are as below:
1. Round-Robin
2. Proportional Fair
3. Max CQI or Max C/I

We will discuss all one by one.

1. Round- Robin scheduler:- As it names suggest this type of scheduler schedules UE in a circular manner without considering the channel condition.

Pros:- Creating an equal resource share to all users.
Cons:- The UE with Sub-Optimal CQI will also allocate with PRB thus reducing the overall Cell/User throughput.

2. Proportional Fair Scheduler:- As it name suggest this scheduler tries to make balance between throughput and fairness among all the UEs. Means it tries to maximize the total throughput and at the same time tries to provides all users at least a minimal service.

Pros:- There is equal amount of trade off between throughput and fairness.
Cons:- Implementation is complex and we can not reach the highest cell throughput with this scheduler.

3. Max CQI scheduler:- As it name suggest this type of scheduler uses the strategy to assign the PRB to the user with the best channel condition means highest CQI.

Pros:- We can reach the maximum throughput.
Cons:- Cell edged UEs are starved of scheduling which leads to poor UE experiences.

So keeping in mind the throughput and fairness for users the proportional fair schedulers are most common to use.

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