LTE / LTE-Advanced
- Use the LTE test case wizard for your eNB conformance testing
- Test the ON/OFF power of your TD-LTE base station
- Visualize your radio network performance
- Simplify field testing of remote radio heads
- Test your remote radio head solutions
- Filtering and how it impacts the performance of your LTE signal
- Time windowing and how OFDM impacts the shape of your LTE signal
- Test the performance of your LTE eNB
- TOOL: LTE Resource Allocation
- VIDEO: LTE-Advanced - Carrier aggregation testing with a real DUT presented at GSMA MWC 2012
- VIDEO: Combined PQA and RF test system for video over LTE testing presented at GSMA MWC 2012
- VIDEO: Test system for mobile wireless location based services presented at GSMA MWC 2012
- VIDEO: Multi-band LTE MIMO drive test presented at GSMA MWC 2012
- VIDEO: Voice over LTE audio quality testing presented at GSMA MWC 2012
- VIDEO: LTE protocol testing with SRVCC support presented at GSMA MWC 2012
- VIDEO: LTE rollout challenges: Straight talk from Rohde & Schwarz at LTE World Summit 2011
- More Applications
LTE Resource Allocation Tool
LTE provides huge flexibility when it comes to allocating of downlink and uplink resources on the air interface. The LTE resource allocation tool supports you in your everyday LTE work and helps you to understand some basic parameters related to scheduling and resource allocation as defined in 3GPP specifications TS 36.211 to 36.213.
The tool consists of five modules:
The "Resource Allocation Type 2 Downlink" and "Resource Allocation Type 2 Uplink" modules assist you in interpreting the important case of resource allocation type 2. Based on the number of LTE resource blocks (RB) you want to allocate and the starting resource block in the frequency domain, the resource indication value (RIV) is calculated (RB to RIV). The RIV is used for signaling the resource allocation from the base station to the terminal. The other way round also works: A given RIV can be converted to the corresponding number of resource blocks and starting resource block (RIV to RB). The resulting resource allocation is graphically displayed. Please note that localized resource allocation is assumed for downlink.
The "Transport Block Size Downlink" and "Transport Block Size Uplink" modules evaluate the transport block sizes and modulation and coding schemes (MCS) that can be carried over a given resource allocation. Enter a combination of resource block allocation size and MCS value, and the resulting transport block size, code rate and modulation scheme will be displayed.
A brief explanation of the terms used is given below. For a detailed explanation, please refer to www.rohde-schwarz.com/appnote/1MA111
Resource block (RB): The basic LTE resource entity in the frequency domain is the resource block of 180 kHz. One or more resource blocks can be allocated to a terminal for data transmission and reception. LTE supports scalable bandwidths from 1.4 MHz up to 20 MHz, corresponding to different numbers of resource blocks (6 up to 100) that can be allocated at maximum.
Resource allocation type: For efficient signaling of the resource allocations from the base station to the terminal, different resource allocation types are supported. In resource allocation type 2, which is used in the downlink and uplink, a starting resource block and an allocated number of resource blocks are signaled to the terminal. In order to save signaling bits on the downlink control channel (physical downlink control channel, PDCCH), these two parameters are not explicitly signaled. Instead, a resource indication value (RIV) is derived which is signaled in the downlink control information on the PDCCH.
Transport block: Higher-layer data packets are multiplexed onto transport blocks which are delivered to LTE physical layer for transmission. Per LTE transmission time interval of 1 ms, one transport block - or up to two in the case of multiple-input, multiple-output (MIMO) spatial multiplexing - can be transmitted.
Modulation and coding scheme (MCS): The MCS index (0 to 31) is used by the base station to signal to the terminal the modulation and coding scheme to use for receiving or transmitting a certain transport block. Each MCS index stands for a certain modulation order and transport block size index. The latter can be used to derive the transport block size for a given resource block allocation.
Code rate: The code rate is defined as the ratio between the transport block size and the total number of physical layer bits per subframe that are available for transmission of that transport block. The code rate is an indication for the redundancy that has been added due to the channel coding process. In this tool, the calculation of the code rate in the downlink assumes single-input, single-output (SISO) operation and does not take into account the physical broadcast channel (PBCH) and synchronization channels (P/S-SCH). For the uplink, sounding reference signal (SRS) overhead is not considered.
