tive resources of the BWP with the associated numerology. The BWPs can be activated or deactivated by many different means, including dedicated RRC signaling, DCI with explicit indication, or timer-based activation: BWP config for PCell BWP # 1 BWP # 2 PCell BWP switch by BWP switch by BWP RRC-layer config BWP # 1 BWP # 1 Initial BWP BWP # 2 BWP config for PCell BWP # 1 BWP # 2 SCell BWP # 1 BWP # 1 BWP switch by BWP switch by Scell Activation CONNECTED Initial Access Single Multiple Activated Cells Activated Figure 6.18 - BWP operation In the figure here, you can see a basic example of how BWPs operate. There is an initial BWP that is used by all devices for initial access. Then, either by DCI or RRC, the devices can be assigned to different BWPs based on their frequency resource needs. Now, let's understand BWPs deeply by evaluating their use cases. 5G Air Interface and Physical Layer Procedures - Part 3 BWP use cases So, what are the use cases for these BWPs? The first one is supporting devices with a reduced bandwidth capability. We already discussed that NR is different from LTE in this respect. LTE mandated all devices to support all the bandwidth available and the device would always access the network using the cells' bandwidth. In NR, on the other hand, a device with less bandwidth support is still able to access the cells. The cells define a BWP according to the devices' minimum bandwidth and assign it to the device to support this kind of bandwidth-limited scenario: Overall carrier Figure 6.19 - Supporting reduced device bandwidth capability Another interesting use case is energy saving. If a device does not require high throughput, it can be transferred to another BWP with less bandwidth. Therefore, the device can then reduce its baseband processing clock and save power: Overall carrier BWP # 2 BWP # 1 Figure 6.20 - Supporting reduced device energy consumption Another use case is being able to multiplex the numerologies. Each BWP has its own numerology, discussed previously. So, devices with different