The Cell Specific RS button turns the display of cell
specific reference signals on or off.
The Physical Channel button turns the display of physical
channels on or off.
This topic describes how to use the resource mapping graph. Resource mapping graphs vary in appearance between the different carrier types available in the software. The examples in this topic are for a Basic LTE Downlink carrier, but the principles still apply to all carrier types.
For Basic carriers, the resource mapping graph appears at the bottom of the Resource Block, Physical Channel, and Transport Channel property grids. This graph also has two display functions:
The Cell Specific RS button turns the display of cell
specific reference signals on or off.
The Physical Channel button turns the display of physical
channels on or off.
For Advanced carriers, the resource mapping graph appears at the bottom of the Downlink/Uplink and Channel Setup property grids. This graph does not have the display functions described above.
For improved viewing, you can enlarge the resource mapping graph by dragging the borders with your mouse pointer.
The example shown below is the Full filled QPSK 5 MHz (25 RB)
configuration, selected using the Predefined Carrier button 
.
In Figure 1 the resource mapping graph is shown with the display of reference signals, physical channels, and transport channels turned off. In this view, the basic structure of the frame is visible, with each of the columns in Figure 1 representing one slot in the 20 slot frame. In this example, the 20 slots, numbered 0 to 19, are occupied by resource block collections 1 to 20 listed in the Resource Block node for the Full filled QPSK 5 MHz (25 RB) configuration.
When you place the cursor on an occupied resource block, the corresponding resource block collection number is displayed. This is shown for Resource Block Collection 1 in Figure 1. In this example, each resource block collection occupies all resource blocks (0 to 24) in its corresponding slot. (Color is absent from unoccupied resource blocks.)
Figure 1. Resource Block Collections
The numbering across the top of the resource mapping graph (0 to 19 in the example above) corresponds to the number of slots. The software adjusts this numbering automatically based on the Waveform Generation Length selection in the Carrier node.
The horizontal width of each slot represents the number of OFDM symbols in the time domain, corresponding to the number of OFDM symbols per slot displayed in the Number of Symbols for Resource Block cell in the Downlink node.
The numbers to the left of the resource mapping graph (0 to 24 in Figure 1) correspond to resource block positions in the frequency domain. The number of resource blocks displayed is determined by the System Bandwidth selected in the Downlink node. In the example shown, the transmission bandwidth is 5 MHz, the resource block size is 12, and the corresponding number of resource blocks is 25 as shown in the Total Number of Resource Blocks cell.
In the example, each resource block contains 12 subcarriers in the frequency domain as shown in the Number of Subcarriers for Resource Block cell in the Downlink node. The black rectangle in Figure 2 indicates one resource block made up of 7 OFDM symbols (horizontally) and 12 subcarriers (vertically). Each resource block therefore consists of 7x12 = 84 resource elements.
Figure 2. One Resource Block
In Figure 3, the resource mapping graph is shown with only the cell specific reference signals turned on. The red horizontal segments represent cell specific reference signal symbols, each of which occupies one resource element.
If the software applies an offset to the cell specific reference signal in a particular subframe as shown in the Cell specific Reference Signal Frequency Shift cell in the eNB Setup node, the software applies this offset to the position of the corresponding cell specific reference signal indicators in the resource mapping graph.
Figure 3. Reference Signals
In Figure 4, reference signals and physical channels are turned on. Each occupied subframe (two consecutive slots) is shown in a different color. In this example, each subframe is occupied by a physical downlink shared channel (PDSCH). Physical channel 3 occupies slots 0 and 1 (resource block collections 1 and 2). The label for this channel is displayed in Figure 4. Physical channels 4 to 12 are mapped to the remaining subframes.
Figure 4. Physical Channels
The PDCCH label in Figure 5 indicates that the first three symbols in each subframe (green vertical columns) are occupied by the physical downlink control channel (PDCCH). In this example, the PDCCH is assigned to physical channel 2. You can define 1 to 3 symbols for the PDCCH in each slot with the PDCCH Allocations parameter.
Figure 5. PDCCH Label
The primary synchronization signal (P-SS) and secondary synchronization signal (S-SS) configured in the eNB Setup node are displayed as shown in Figure 6. In the example shown in Figure 4, the software maps the synchronization signals to resource elements on 72 subcarriers centered around the DC subcarrier in slot 0 and slot 10 in compliance with the 3GPP technical specification for the generic frame structure (see 3GPP technical specification TS 36.211).
Figure 6. Synchronization Signals
In the example shown in Figure 4, the software maps the physical broadcast channel (PBCH) to resource elements on 72 subcarriers centered around the DC subcarrier (that are not reserved for reference signals) in compliance with the 3GPP technical specification for the generic frame structure (see 3GPP technical specification TS 36.211). Figure 7 shows the resource elements occupied by the PBCH (in blue).
Figure 7. Physical Broadcast Channel