Uplink subframe number for start of PRACH opportunity within the half frame. Radio frame duration. Basic time unit. Slot duration. Precoding matrix for downlink spatial multiplexing. Amplitude scaling for PRACH. Amplitude scaling for PUCCH. Amplitude scaling for PUSCH. Amplitude scaling for sounding reference symbols. Subcarrier spacing. Subcarrier spacing for the random access preamble.
PRACH Configuration Index 14 is assumed, i.e., preambles can be sent on any system frame number and subframe number. The RA preamble is modeled using the LteControlMessage class, i.e., as an ideal message that does not consume any radio resources. The collision of preamble transmission by multiple UEs in the same cell are modeled using a protocol interference model, i.e., whenever two or more.
Long-Term Evolution (LTE) and its improvement, Long-Term Evolution-Advanced (LTE-A), are attractive choices for Machine-to-Machine (M2M) communication due to their ubiquitous coverage and high bandwidth. However, the focus of LTE design was high performance connection-based communications between human-operated devices (also known as human-to-human, or H2H traffic), which was initially.
System frame number. Slot number within a radio frame. Absolute subframe number. Index for subframes allowed for preamble transmission. Number of antenna ports used for transmission of a channel. Antenna port number. Codeword number. Index for PRACH versions with same preamble format and PRACH density. Q m Modulation order: 2 for QPSK, 4 for.
Mini-slots (also known as non-slot-based scheduling) refer to the case when a transmission can span a number of symbols significantly less than the number of symbols in a slot (14), e.g., as small as 1-symbol. This provides more flexible resource management for a cell and possibilities to achieve low latency (LL), which when combined with ultra-reliability (UR) readily brings URLLC (URLL.
The subframe structure of length 2 ms (3 x 2560 chips) consists of three slots, each of 2560 chips as shown in Fig. 2-60. The HARQ-ACK is carried in the first slot of the HSDPCCH sub-frame. The CQI, and in case the UE is configured in MIMO mode also the PCI, are carried in the second and third slot of a HS-DPCCH sub-frame. of the HS-DPCCH subframe according to the HS-PDSCH mode. There is at.
Machine-to-machine (M2M) communications allow multiple devices to communicate directly without human intervention. There will be a huge number of devices in the M2M communications which results in enormous congestion in the current Random Access Channel (RACH) of LTE based cellular systems. This paper presents a protocol for improving the performance of the LTE RACH for M2M applications.
PRACH Transmission: Use hNRPRACHWaveformGenerator to generate a PRACH waveform. Send the PRACH preambles with the timing offsets defined in TS 38.141-1 Figure 126.96.36.199.2-2. Set a timing offset base value to 50% of the number of cyclic shifts for PRACH generation. This offset is increased for each preamble, adding a step value of 0.1 microseconds.
For the default parameters configurations, the number of samples in each subframe is 15360, the transport block size in each subframe is 2555, the number of channel bits in each subframe is 7200, the number of allocated REs for PUSCH in each subframe is 3600, the number of total REs in each subframe is 4200. Uplink control information in the form of RI, HARQ-ACK and CQI are not transmitted.
Info: Structure with information corresponding to the PRACH OFDM modulation. If the PRACH is configured for FR2 or the PRACH slot for the current configuration spans more than one subframe, some of the OFDM-related information may be different between PRACH slots. In this case, the info structure is an array of the same length as the number of.
Slots Il Il PUSCH PUCCH PRACH DRS SRS Figure 6.11 Example mapping of physical channels to resource elements in the uplink, using FDD mode, a normal cyclic prefix, a 5 MHz bandwidth and example configurations for the PUCCH, PRACH and SRS. Table 7.1 Steps in the cell acquisition procedure Step 2 4 6 Task Receive PSS Receive SSS Start reception of RS Read MIB from PBCH Start reception of PCFICH.
In the case of 30 kHz PRACH subcarrier spacing, only one of the two PRACH slots within a 15 kHz subcarrier spacing can be active. According to Table 188.8.131.52-2 in TS 38.211, either the first or the second PRACH slots can be active for PRACH preamble format B2.
According to Table 184.108.40.206-2 in TS 38.211, either the first or the second PRACH slots can be active for PRACH preamble format B2. The value of prach.ActivePRACHSlot property defines which PRACH slot is active within the current carrier subframe.
PUCCH uses one resource block in each of the two slots in a subframe. Within the. number Subframe number PRACH Configuration Index Preamble Format System frame number Subframe number 0 0 Even 1 32 2 Even 1 1 0 Even 4 33 2 Even 4 2 0 Even 7 34 2 Even 7 3 0 Any 1 35 2 Any 1 4 0 Any 4 36 2 Any 4 5 0 Any 7 37 2 Any 7 6 0 Any 1, 6 38 2 Any 1, 6 7 0 Any 2 ,7 39 2 Any 2 ,7 8 0 Any 3, 8 40 2 Any 3.
LTE Frame structure. As mentioned as per topologies, TDD and FDD there are two frame structures viz. type-1 and type-2 LTE frame structure. Total Frame duration is about 10ms. There are total 10 subframes in a frame. Each subframe composed of 2 time slots. Type 1 is used as LTE FDD frame structure. As shown in the figure below, an LTE TDD frame.
As you see in the slot structure, PUCCH is located in the either extreme ends of the uplink frequency domain in alternating fashion between the two slots within a subframe, meaning that if the PUCCH is the lowest part of frequency domain in slot 0(first slot) and it will be located in the higest part of frequency domain in slot 1 (second slot). Exactly how many resource elements is allocated.
The relation between the physical resource block number in the frequency domain and resource elements in a slot is given by. 9.2.4 Resource pool. The subframe pools and resource block pools are defined in (4). For PSSCH, the number of the current slot in the subframe pool, where is the number of the current slot within the current sidelink subframe with equal to the subscript of, defined in.
In a radio with a transmitter and receiver operating simultaneously within such close proximity, the receiver must filter out as much of the transmitter signal as possible. The greater the spectrum separation, the more effective the filters. FDD uses lots of frequency spectrum, though, generally at least twice the spectrum needed by TDD. In.
Slot: There are 2 slots within a Subframe which makes 20 slots within a radio frame. The time of transmitting one slot is 0.5 ms. OFDM Symbol: The transmission is divided into OFDM symbols in time domain. The number of OFDM symbols within a slot is 7 when we use a normal cyclic prefix.