EA038344B1 - Method of pulse batch data transmission in the fifth generation mobile communications networks - Google Patents

Abstract

The essence of the invention consists in forming the structures of transport package and a variable length transport block of the channel level using input parameters retrieved directly from the physical level of OSI model via an interlayer communication procedure. The procedure is used to record the current values of OFDM-symbol length and modulation order to dedicated data registers and their read-out while initializing the procedure of forming transport blocks of variable lengths. On the receiver side the procedure to process transport structures is followed that consists in extracting the incapsulated information, calculating and checking control sums of the transport block and the transport package. The aim of the invention is to support transport blocks of variable lengths without third-party means and protocols.

Description

The present invention relates to communication, and in particular to methods for generating data link structures using inter-layer communication for fifth generation wireless communication systems.

Wireless communication systems are widely used to provide communication services, including both traditional voice communication services and the transmission of packet data, messages, media information. At the same time, there is an increase in the volume of information transmitted over mobile networks, which leads to the need to revise the formation of the transmission personnel structure.

The known method of pulse packet communication, based on the formation of MAC-level frames [1]. The construction of the frame and the transport block is based on the use of the source identifier, the recipient identifier and a set of logical identifiers found in the headers of the transport structures, which makes it possible to implement communication of the device-to-device type. The disadvantages of this invention are the constant length of the frame, transport block and the use of identifier management sublayers.

In addition, there is a method and device based on the formation of a frame structure using two preambles [2]. The method describes a frame structure that supports various modes of operation by changing the used preamble for each of the signal bands. The disadvantage of this method is the limitation of the supported technologies, namely, operability only in mobile networks of the 802.16 (WiMax) standard.

Closest to the proposed invention is a method, which describes a frame of a new format, transmitted in accordance with the radio communication protocol (RLP), the information frame consists of a plurality of sequential multiplex frames of variable length [3]. The disadvantage is the use of an RLP frame containing the transmission data and controlling the frame length.

The objective of the invention is to support transport blocks of variable length without the use of third-party tools and protocols.

The essence of the invention is expressed in the formation of transport structures of the channel layer of variable length, using the interlayer interaction procedure, to obtain input parameters directly from the physical layer of the OSI model by reading the dedicated data registers storing the current parameters of the physical layer, also in the procedure for processing transport structures on the side of the receiving device , expressed in the disclosure of encapsulated information, calculation and verification of checksums of the transport block and transport packet.

The method of pulsed packet data transmission of fifth generation communication networks performs the functions of forming a transport packet and a variable-length block, differing in that the procedure for writing the current parameters of the number of OFDM symbols and the modulation order of the physical layer into the dedicated data registers is applied, reading the input parameters to form a transport variable block length comes directly from the data registers.

The method of pulsed packet data transmission of communication networks of the fifth generation is a step-by-step process of encapsulating the transmitted information. The invention consists of two stages for transmitting and receiving parts, respectively. The transmitting part algorithm consists of three stages:

formation of a transport package;

formation of a transport block;

calculation of the required number of OFDM symbols.

FIG. 1 shows the structure of a transport package.

FIG. 2 shows the structure of the transport block.

FIG. 3 shows a logical connection of the parts of the invention with an indication of the input and output data.

The value of the transmitted packet length and data for transmission from higher levels are accepted as input parameters. Based on the input data (packet length), data is extracted to form a transport packet (Fig. 1). The input parameter of the packet length indicates the total size of the packet, including the service information, then the amount of payload is represented by the expression: Pl-16 bytes, where Pl is the total length of the transport packet. Next - the formation of the transport block (Fig. 2) and the calculation of the required number of OFDM symbols based on the received input data.

Service fields are reserved in the transport packet, so 12 bytes are reserved for the packet header at the beginning and 4 bytes under the syncend field at the end. The following data is written to the header in turn:

the field indicating the beginning of the syncstart packet - 4 bytes, constant value;

the field containing the sequence number of the packet - 2 bytes;

packet length field indicating the length of the information component of the packet - 2 bytes;

CRC checksum field - 4 bytes (typical CRC 32 algorithm, calculated for the header of the transport packet).

The syncend field is added to the end of the packet - 4 bytes, indicating the completion of the transport packet, a constant value.

The output data is a structured transport packet containing encapsulated data and service fields.

The physical layer stores the values of the modulation order and the number of subcarriers of the OFDM signal in data registers, 12 and 4 bits, respectively, the values can be stored in the form of service flags.

The process of forming a transport block begins with calculating the length of the transport block, equal to the length of the OFDM symbol, expressed in terms of

N-m i b0> um byte, where N is the number of subcarriers of the OFDM signal, m is the modulation order, the input data used are received as a result of the interlayer interaction procedure between the channel (MAC) and physical (PHY) layers. The length of the received packet is compared with the calculated one, if it turns out to be larger, then the packet is divided into several transport blocks, if less, the structure of the transport block is filled. In both cases, the service fields of the transport block are identical:

data on the length of the information load -4 bytes are entered in the TB header;

information load is recorded in the TB body;

the filling of the block is calculated, namely the padding field, expressed through the difference in the possible packet length (1 block of the algorithm) and the information load, the resulting length (bytes) is filled with zeros, in the case of a zero value of the difference, the padding block is not added to the overall TB structure;

the end of TB is padded with a CRC 32 - 4 bytes. The final step is to calculate the required number of OFDM symbols for transmission of the transport packet represented by the formula

-------- ^[byte] '(2 - ^) - 86aww where

N-m --kbyte

-d ^it is the length of the OFDM symbol, Pl is the length of the network packet. When a fractional value of the amount of the number of OFDM symbols is obtained, rounding up to an integer value occurs.

On the receiver side, there is a step-by-step typical unpacking of encapsulated information from a transport block into a transport packet and from a transport packet into the original data. At each stage of unpacking, checksums are compared; if they do not match, the transport block or transport packet is discarded.

FIG. 3 shows the logical connection of parts of the invention, which is a method for pulsed packet data transmission of communication networks of the fifth generation, the legend adopted for FIG. 3:

a1 is the length of the transport package;

a2 is the number of signal modulation levels;

a3 is the number of subcarriers of the OFDM signal;

p1 - transport packet of the presented structure;

bl - transport block of the presented structure;

c1 is the calculated value of the number of OFDM symbols.

The main advantage of this method is the reduction of the service information involved in the procedure for the formation of transport blocks.

Sources of information.

1. RF patent No. 2454040.

2. International publication WO 2015115743.

3. US patent 20040120348, prototype.

Claims (1)

CLAIM A method of pulsed packet data transmission in fifth generation mobile communication networks, including the formation of the structure of transport packets, transport blocks of variable length, calculating the length of an OFDM symbol, characterized in that an interlayer interaction procedure is used to obtain input data directly from the physical layer, namely, the procedure is used recording the current parameters of the number of OFDM symbols and the modulation order of the physical layer in the dedicated data registers - 12 and 4 bits, respectively, on the receiver side, a transport block is received, consisting of the fields of the indicator of the length of the information load, the encapsulated transport packet, the filling and the checksum of the transport block, the checksum of the received transport block is computed, and the contents of the encapsulated transport packet field are expanded, the checksum of the transport packet is computed, and the data field is expanded.