Resource Element Group in LTE
In Long-Term Evolution (LTE), Resource Element Group (REG) is a fundamental concept related to physical layer resources. It is essentially a grouping of Resource Elements (REs), which are the smallest units of the time-frequency grid in LTE. The REG is used to allocate resources for transmission and reception.
Now, let’s break down the key components:
- Resource Element (RE): The basic building block in LTE’s time-frequency grid. It represents a single modulation symbol in a resource block.
- Resource Block (RB): A collection of consecutive REs in the time and frequency domain. It is the basic unit for resource allocation in LTE.
- Resource Element Group (REG): A set of contiguous REs within a resource block. REGs are used for certain reference signals, such as cell-specific reference signals (CRS) and UE-specific reference signals (UE-RS).
The grouping of REs into REGs allows for efficient resource allocation and reference signal transmission. It aids in signal demodulation and provides a structured way to organize the physical layer resources in LTE.
In summary, the Resource Element Group (REG) is a grouping of Resource Elements (REs) within a Resource Block (RB), playing a crucial role in LTE’s physical layer for efficient resource allocation and signal transmission.
- For the control channel, the radio signaling, the Resource Block is not the adapted unit.
- The control channels mapped on the Resource Elements Groups (REGs), which represent less radio resources
- A REG is made up of 4 (or 6 if there are pilot sub-carriers) sub-carriers during 1 symbol.
- The REG are grouped into the CCE (Control Channel Element)
Resource element groups are sued for defining the mapping of control channels to resource elements.
Resource Element Group in LTE
A Resource Element Group (REG) in LTE is a set of resource elements that are grouped together to simplify resource management. Each resource element is the smallest unit of data transmission, corresponding to one subcarrier in one symbol time. When we talk about REGs, we’re referring to groups of these small units bundled together to be allocated more efficiently.
The main idea behind REGs is to manage how the system organizes and assigns the available frequency and time resources to different users or services. So, when you’re using your phone, LTE might group several resource elements into an REG to handle specific tasks, like transmitting data or control information.
For example, if you’re making a voice call or browsing the web, the system can assign a REG for your data needs, ensuring that the network handles your request as efficiently as possible. The number of resource elements in a REG can vary, depending on the system configuration and your connection’s requirements.