CN111327399A

CN111327399A - Method and system for sending and receiving control information of communication physical frame

Info

Publication number: CN111327399A
Application number: CN202010092269.2A
Authority: CN
Inventors: 刘宣; 张海龙; 唐悦; 李然; 任毅; 周晖; 徐英辉; 王齐
Original assignee: State Grid Corp of China SGCC; China Electric Power Research Institute Co Ltd CEPRI
Current assignee: State Grid Corp of China SGCC; China Electric Power Research Institute Co Ltd CEPRI
Priority date: 2020-02-14
Filing date: 2020-02-14
Publication date: 2020-06-23
Anticipated expiration: 2040-02-14
Also published as: CN111327399B

Abstract

The invention discloses a method for sending and receiving control information of a communication physical frame, wherein the control information of the physical frame adopts a double-stage structure and is divided into an SIG domain and a PHR domain; when the signal transmission quality of both communication sides is good, the transmitting end can select a modulation coding mode with higher spectral efficiency, and on the premise of ensuring that the receiving end can correctly demodulate the control information, the time-frequency resources occupied by the control information in the physical frame can be greatly reduced, thereby overcoming the defects that the prior art can not adaptively adapt to the channel quality, the physical frame length is fixed, the system resource redundancy can not adaptively reduce and the like, and realizing the highest utilization efficiency of the time-frequency resources under the premise that the whole control information section is successfully communicated.

Description

Method and system for sending and receiving control information of communication physical frame

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and a system for sending and receiving control information of a communication physical frame.

Background

When all communication systems transmit physical layer data frames, a small amount of communication resources are required to be allocated to transmit control information, which is used to indicate information such as resource allocation and transmission parameters of data loads. Different communication systems can adopt different physical frame control information sending methods based on different system design requirements.

In digital broadcast communication systems such as DVB-T2, ATSC3.0, and DTMB, a part of physical frame control information is transmitted as being piggybacked in a synchronization signal (preamble synchronization signal or pilot signal), which results in greatly increased complexity of reception of synchronization detection and control information demodulation. And a part of physical frame control information is transmitted by using a special subframe, and a single modulation and coding mode with extremely low spectral efficiency is adopted, so that a receiver can correctly demodulate and decode the control information under the environment with poor signal-to-noise ratio. For simplicity, the interleaving or diversity method used when transmitting the control information is generally simpler. For users with severe signal fading, a continuous multi-frame combining processing mode is needed to make up for the problems of insufficient interleaving and diversity gain, so as to demodulate the control information correctly. In the control information sending method, the physical layer of the transmitting end is relatively simple to realize, but the receiving processing time delay of the receiving end is relatively large. The system resources occupied by the system information and the modulation coding mode are fixed and unchanged, and more appropriate modulation coding parameters cannot be selected in a self-adaptive manner according to the communication quality of a channel or the requirements of users.

In a digital cellular mobile communication network such as LTE, dedicated time-frequency resources (referred to as control channels in LTE) are designed for transmission of control information. The system common control information is broadcasted to the whole cell through BCH (broadcast channel), and the sending method of the broadcast channel adopts a fixed resource allocation and fixed modulation coding mode. Specific control information for a certain terminal or a certain group of terminals is transmitted by combining a PCFICH (physical format indicator channel) + PDCCH (physical downlink control channel). The PDCCH can carry control information with different lengths and functions, the size of the occupied resource is indicated by the PCFICH, and a fixed coding mode is adopted. In order to reduce the complexity as much as possible, reduce the resource occupation ratio of control information and improve the system capacity, the control channel of the LTE adopts a quasi-static design. That is, once the content of the control information is determined, the time domain and frequency domain resources occupied by the control information, the coding scheme and the diversity scheme adopted by the control information are all fixed. Similar to the digital broadcasting system, in order to enable users in a cell with poor signal coverage to reliably receive control information, a control channel must adopt a modulation and coding mode with a lower received signal-to-noise ratio threshold, so that more system time-frequency resources need to be occupied, transmission delay is increased, and system capacity is reduced.

In emerging application fields such as the internet of things or ad hoc networks, end-to-end communication requires low time delay and low power consumption, and the communication capability of the network becomes an important factor for restricting the overall performance of a communication network. No matter the topology structure of a communication network is star type, tree type or MESH type, if the communication transmission between adjacent nodes can adaptively adjust the transmission parameters of the physical layer according to the channel quality, the transmission of a certain specific QoS is completed by the most economical time-frequency resource and the least transmission delay. The method has great contribution to the aspects of improving the system capacity of the whole network, reducing the collision probability during resource competition, reducing the power consumption of the terminal and the like. Among these, the design of the adaptive transmission method of control information and the receiving apparatus is very critical. The control information transmission technique in the existing communication system is lack of flexibility in selecting transmission parameters such as modulation coding and diversity, has many limitations and defects, and cannot directly meet the adaptive transmission requirement.

Disclosure of Invention

The invention provides a sending method and a system, a receiving method and a system of communication physical frame control information, and aims to solve the problem of how to efficiently transmit physical frame information.

In order to solve the above problem, according to an aspect of the present invention, there is provided a transmission method of communication physical frame control information, the method including:

a Physical layer of a sending end receives Signaling Indication (SIG) Data, Physical Header (PHR) Data and service Data Unit (PSDU) Data from a link layer; the SIG data and the PHR data form the communication physical frame control information and are transmitted through a two-stage time domain subframe structure, the first-stage time domain subframe data is the previous SIG data, and the second-stage time domain subframe data is the next PHR data; the SIG data carries a modulation Mode, a coding Mode and a diversity Mode of the PHR data, and indicates through a Rate Mode parameter (RM) value that different RM values correspond to different modulation modes, coding modes and diversity modes; the PHR data bears the resource allocation of the PSDU data and the transmission parameter information corresponding to the PSDU domain;

the physical layer of the sending end performs SIG domain data processing on the SIG data to acquire SIG time domain subframe data to be sent;

performing PHR domain data processing on the PHR data by a physical layer of the sending end according to an RM value of the PHR data registered by the SIG data to acquire PHR time domain subframe data to be sent;

the physical layer of the sending end performs PSDU domain data processing on the PSDU data according to the resource allocation and sending parameter information of the PSDU data determined based on the PHR data so as to obtain PSDU time domain subframe data to be sent;

and the sending end physical layer multiplexes the SIG time domain subframe data, the PHR time domain subframe data and the PSDU time domain subframe data with preamble data to obtain a complete baseband physical frame signal, and sends the signal to a receiving end through a radio frequency front end.

Preferably, the sending-end physical layer performs SIG field data processing on the SIG data according to sending parameter information corresponding to a preset fixed signaling indication field.

Preferably, wherein the method further comprises:

setting the RM value of the PHR data to be a fixed value; or adaptively adjusting the RM value of the PHR data in real time; wherein different RM values are used in different physical frames.

Preferably, the adaptively adjusting the RM value of the PHR data in real time includes:

if the Quality of service (Qos) requirement which can be supported by the current received signal Quality and/or communication success rate is higher than the Qos requirement of the current data load, adjusting the RM value of the current PHR data to select an RM mode with higher spectral efficiency than the current spectral efficiency; if the Qos requirements that the current received signal quality and/or communication success rate can support are less than the Qos requirements of the current data load, the RM value of the current PHR data is adjusted to select an RM mode with spectral efficiency lower than the current spectral efficiency.

Preferably, the SIG field data processing comprises: coding processing, symbol filling processing, scrambling processing, constellation mapping and digital front end processing.

Preferably, the PHR domain data processing includes: forward Error Correction (FEC) coding processing, channel interleaving processing, ROBO (ROBust OFDM) interleaving and diversity processing, constellation mapping processing, and digital front end processing.

Preferably, wherein the method further comprises:

and when the FEC coding processing is carried out on the PHR data, selecting a required coding method and a corresponding coding code rate according to the coding mode indicated by the RM value.

Preferably, wherein the method further comprises:

and carrying out ROBO interleaving and diversity processing on the PHR data in a time domain and a frequency domain in a dispersing way so as to simultaneously cope with the communication scene under severe frequency selective fading and time-varying channels.

Preferably, the PSDU domain data processing includes: scrambling processing, FEC coding processing, channel interleaving processing, ROBO interleaving and diversity processing, constellation mapping processing and digital front end processing.

Preferably, wherein the digital front end processing comprises: at least one of frequency domain to time domain processing, upsampling processing, and shaping filtering processing.

According to another aspect of the present invention, there is provided a transmission system for communicating physical frame control information, the system including:

a data receiving module, configured to enable a physical layer at a sending end to receive signaling indication SIG data from a link layer, PHR data of a physical frame control header, and PSDU data of a service data unit; the SIG data and the PHR data form the communication physical frame control information and are transmitted through a two-stage time domain subframe structure, the first-stage time domain subframe data is the previous SIG data, and the second-stage time domain subframe data is the next PHR data; the SIG data carries a modulation mode, a coding mode and a diversity mode of the PHR data, and indicates through a rate mode parameter RM value that different RM values correspond to different modulation modes, coding modes and diversity modes; the PHR data bears the resource allocation of the PSDU data and the transmission parameter information corresponding to the PSDU domain;

the SIG data processing module is used for enabling a sending end physical layer to perform SIG domain data processing on the SIG data so as to acquire SIG time domain subframe data to be sent;

the PHR data processing module is used for enabling a sending end physical layer to perform PHR domain data processing on the PHR data according to an RM value of the PHR data posted by the SIG data so as to acquire PHR time domain subframe data to be sent;

the PSDU data processing module is used for enabling the sending end physical layer to perform PSDU domain data processing on the PSDU data according to the PSDU data resource allocation and sending parameter information determined based on the PHR data so as to obtain PSDU time domain subframe data to be sent;

and the data transmitting module is used for enabling the sending end physical layer to multiplex the SIG time domain subframe data, the PHR time domain subframe data and the PSDU time domain subframe data with the preamble data so as to obtain a complete baseband physical frame signal, and sending the complete baseband physical frame signal to the receiving end through the radio frequency front end.

According to still another aspect of the present invention, there is provided a method of receiving communication physical frame control information, the method including:

a receiver of a physical layer of a receiving end performs radio frequency front end processing on a received signal to acquire a complete baseband physical frame signal, and completes physical frame synchronization and channel estimation by using a synchronization preamble symbol to complete demultiplexing and coherent demodulation of the baseband physical frame signal to acquire data to be analyzed of a SIG domain, a PHR domain and a PSDU domain;

the physical layer of the receiving end analyzes the acquired data to be analyzed of the SIG domain according to the transmission parameter information corresponding to the known signaling indication domain so as to acquire an RM value of the PHR data and determine a modulation mode, a coding mode and a diversity mode of the PHR domain;

the physical layer of the receiving end analyzes the data to be analyzed of the PHR domain according to the obtained RM value of the PHR data so as to obtain the resource allocation and the sending parameter information of the PSDU domain;

and the physical layer of the receiving end analyzes the acquired data to be analyzed of the PSUD domain according to the acquired resource allocation and transmission parameter information of the PSDU domain.

Preferably, the analyzing, by the physical layer of the receiving end, the acquired data to be analyzed of the SIG field according to the transmission parameter information corresponding to the known signaling indication field includes:

and the physical layer of the receiving end sequentially performs descrambling processing, diversity combining processing and FEC decoding processing on the acquired frequency domain data of the SIG domain according to the transmission parameter information corresponding to the known signaling indication domain.

Preferably, the analyzing, by the physical layer of the receiving end, the data to be analyzed in the PHR domain according to the obtained RM value of the PHR data to obtain the physical frame control information includes:

and the physical layer of the receiving end sequentially performs diversity combining processing, de-interleaving processing and FEC decoding processing on the frequency domain data of the PHR domain according to the obtained RM value of the PHR data so as to obtain a decoding result of the physical frame control information.

Preferably, wherein the method further comprises:

judging whether the control information output by the current PHR domain decoding is correct or not according to the check bit in the acquired physical frame control information; if the physical frame control information is correct, analyzing the PSDU data according to the resource allocation and transmission parameter information of the PSDU data in the current physical frame control information; otherwise, it is determined that the acquired physical frame control information is incorrect, the reception of the PHR domain fails this time, and the current physical frame gives up the analysis of the PSDU data.

According to still another aspect of the present invention, there is provided a receiving system for communicating physical frame control information, the system including:

the data acquisition module to be analyzed is used for enabling a receiver of a physical layer of a receiving end to perform radio frequency front end processing on a received signal so as to acquire a complete baseband physical frame signal, and completing physical frame synchronization and channel estimation by utilizing a synchronization preamble symbol so as to complete demultiplexing and coherent demodulation of the baseband physical frame signal so as to acquire data to be analyzed of a SIG domain, a PHR domain and a PSDU domain;

the first analysis module is used for enabling the physical layer of the receiving end to analyze the acquired data to be analyzed in the SIG domain according to the transmission parameter information corresponding to the known signaling indication domain so as to acquire an RM value of the PHR data and determine a modulation mode, a coding mode and a diversity mode of the PHR domain;

the second analysis module is used for enabling the physical layer of the receiving end to analyze the data to be analyzed of the PHR domain according to the obtained RM value of the PHR data so as to obtain resource allocation and sending parameter information of the PSDU domain;

and the third analysis module is used for enabling the physical layer of the receiving end to analyze the acquired data to be analyzed of the PSUD domain according to the acquired resource allocation and the acquired sending parameter information of the PSDU domain.

The invention provides a sending method and a system, a receiving method and a system of communication physical frame information, wherein the physical frame control information adopts a double-stage structure, the control information in the physical frame information is divided into a SIG field and a PHR field, through the control information structure, a sending end of communication can self-adaptively select proper sending parameters of control information modulation coding and/or diversity interleaving and the like aiming at end-to-end signal transmission quality, when the signal transmission quality of two communication sides is good, the sending end can select a modulation coding mode with higher frequency spectrum efficiency, and on the premise of ensuring that a receiving end can correctly demodulate the control information, time-frequency resources occupied by the control information in a physical frame can be greatly reduced. The invention can solve the defects that the prior art can not adaptively adapt to the channel quality, the physical frame length is fixed and unchanged, the system resource redundancy can not adaptively reduce and the like, can adaptively select appropriate control information modulation coding and/or diversity interleaving and other sending parameters according to the indexes of the communication quality, the communication success rate and the like in the communication systems of the Internet of things, the ad hoc network and the like, and correspondingly and efficiently demodulate and receive the control information at a receiving end, thereby realizing the highest utilization efficiency of the time-frequency resources under the premise that the communication of the whole control information section is successful.

Drawings

A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:

fig. 1 is a flowchart of a method 100 for transmitting control information of a communication physical frame according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating a physical frame structure for dual-level frame control according to an embodiment of the present invention;

FIG. 3 is a flow diagram of a data transmission process of a SIG domain according to an embodiment of the present invention;

fig. 4 is a flowchart of a data transmission process of a PHR domain according to an embodiment of the present invention;

fig. 5 is a diagram of an example of transmission of communication physical frame control information according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a system 600 for transmitting control information of a communication physical frame according to an embodiment of the present invention;

fig. 7 is a flowchart of a receiving method 700 for communicating physical frame control information according to an embodiment of the present invention; and

fig. 8 is a schematic structural diagram of a receiving system 800 for communicating physical frame control information according to an embodiment of the present invention.

Detailed Description

The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.

Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.

The sending method of the communication physical frame control information divides the control information in the physical frame information into an SIG domain and a PHR domain, and through the control information structure, a sending end of communication can adaptively select appropriate sending parameters such as control information modulation coding and/or diversity interleaving and the like aiming at the end-to-end signal transmission quality so as to realize the maximum efficiency of time-frequency resources of the whole control information section on the premise of successful communication; when the signal transmission quality of both communication parties is good, the transmitting end can select a modulation coding mode with higher spectral efficiency, and can greatly reduce time-frequency resources occupied by control information in a physical frame on the premise of ensuring that the receiving end can correctly demodulate the control information; the invention can solve the defects that the prior art can not adaptively adapt to the channel quality, the physical frame length is fixed and unchanged, the system resource redundancy can not adaptively reduce and the like, can adaptively select appropriate control information modulation coding and/or diversity interleaving and other sending parameters according to the indexes of the communication quality, the communication success rate and the like in the communication systems of the Internet of things, the ad hoc network and the like, and correspondingly and efficiently demodulate and receive the control information at a receiving end, thereby realizing the highest utilization efficiency of the time-frequency resources under the premise that the communication of the whole control information section is successful.

Fig. 1 is a flowchart of a method 100 for transmitting communication physical frame information according to an embodiment of the present invention. As shown in fig. 1, a sending method 100 for communicating physical frame information according to an embodiment of the present invention starts with step 101, where a sending end physical layer receives signaling indication SIG data, physical frame control header PHR data, and service data unit PSDU data from a link layer in step 101; the SIG data and the PHR data form the communication physical frame control information and are transmitted through a two-stage time domain subframe structure, the first-stage time domain subframe data is the previous SIG data, and the second-stage time domain subframe data is the next PHR data; the SIG data carries a modulation mode, a coding mode and a diversity mode of the PHR data, and indicates through a rate mode parameter RM value that different RM values correspond to different modulation modes, coding modes and diversity modes; the PHR data carries the resource allocation of the PSDU data and the transmission parameter information corresponding to the PSDU domain.

Preferably, wherein the method further comprises:

if the QoS (quality of service) requirement which can be supported by the current receiving signal quality and/or communication success rate is higher than the QoS requirement of the current data load, adjusting the RM value of the current PHR data to select an RM mode with the spectrum efficiency higher than the current spectrum efficiency; if the Qos requirements that the current received signal quality and/or communication success rate can support are less than the Qos requirements of the current data load, the RM value of the current PHR data is adjusted to select an RM mode with spectral efficiency lower than the current spectral efficiency.

In the embodiment of the invention, the physical frame control information adopts a two-stage transmission structure, including two stages in front and back. The first-level signaling indicates that the SIG domain is generated in advance by adopting a fixed modulation coding mode, and carries a modulation mode, a coding mode and diversity interleaving parameters of second-level physical frame control head PHR data, wherein the parameters are mapped into a rate mode RM value short sequence with the length of 3 bits; and the second-level physical frame control head bears the information such as resource allocation of the current physical frame data load, the corresponding sending parameters of the PSDU domain and the like. The RM value of the PHR data of the second level physical frame control header may be adaptively selected or adjusted according to the quality of the received signal and the success rate of communication.

The 3-bit information carried by the SIG field indicates the RM mode of the PHR field. Each RM mode corresponds to a specific modulation coding scheme and/or diversity scheme. After a wireless communication network based on Orthogonal Frequency Division Multiplexing (OFDM) technology successfully forms a network in a certain bandwidth mode, when any node in the network communicates with other nodes, adaptive selection of RM parameters of a PHR may be performed according to the following method:

1. each node defaults to select PHR _ RM as 0 to perform transmission processing of a SIG field (3 bits of SIG information are all 0) and a PHR field (selection of a coding scheme, a modulation scheme, and a diversity scheme is performed according to PHR _ RM ═ 0). The RM mode has the lowest spectral efficiency, but the strongest coding and diversity gains, and can provide the most reliable PHR reception performance.

2. According to the network topology or routing plan, it is assumed that other nodes capable of directly communicating with the current node are aggregated into S ═ S₁,S₂,…,S_i,…,S_N}。

3. Local node probing and node S_iSignal quality (e.g., signal-to-noise ratio), communication success rate, etc.

4. An appropriate RM mode for PHR data is selected according to signal quality, communication success rate, and QoS requirements of data load. Specifically, if the current signal quality is good and the communication success rate is high, and QoS of a higher data load can be supported, an RM mode of PHR data with higher spectrum efficiency (generally corresponding to higher-order constellation modulation, or higher coding rate, or fewer diversity times) is selected; if the current signal quality is poor and the communication success rate is low, a high data load QoS cannot be supported, and an RM mode (generally corresponding to lower-order constellation modulation, or lower coding rate, or more diversity times) of PHR data with low spectrum efficiency needs to be selected.

5. Proceeding to node S according to new RM mode_iAnd (3) modulation and transmission of the SIG data and the PHR data.

6. And re-detecting and evaluating the communication success rate after the RM mode is replaced. If the communication success rate still meets the requirement, maintaining the use of a new RM mode; if the communication success rate is deteriorated, the method returns to the step 4 to select the RM mode again.

7. And continuously detecting the signal quality and the communication success rate of other nodes in the set S, and performing adaptive updating of the RM according to the step 4-6. For the application scenarios of the internet of things with different bandwidth requirements, the modulation mode, the coding mode and the diversity interleaving mode of the PHR may be selected from table 1. The debugging mode comprises the following steps: binary Phase Shift Keying (BPSK) and Quadrature Phase Shift Keying (QPSK). The SIG field carries 3 bits of information, which is used to indicate the RM parameters of the PHR. When the number of diversity times is 1, for example, when the PHR RM is 5 or 6, it means that the PHR does not need ROBO interleaving and diversity.

TABLE 1 Rm parameter mapping relationship between SIG domain content and PHR

SIG content	PHR RM	Number of diversity	Modulation system	FEC code rate
					000	0	6	BPSK	1/2
001	1	4	BPSK	1/2
					010	2	3	BPSK	1/2
011	3	2	BPSK	1/2
					100	4	2	QPSK	1/2
101	5	1	QPSK	1/2
					110	6	1	QPSK	4/5
111	Reserved character	-	-	-

The physical frame structure of the bipolar frame control according to the embodiment of the present invention is shown in fig. 2, and is composed of a preamble, a SIG field, a PHR field, and payload data. The preamble is divided into a short synchronization header and a long synchronization header. The time domain windowing mainly acts at the intersection of two adjacent OFDM symbols with cyclic prefixes. The physical layer OFDM symbol has three bandwidth modes, the Fast Fourier Transform (FFT) point number of the bandwidth mode 1 is 128, and the bandwidth corresponds to 1MHz bandwidth; the FFT point number of the bandwidth mode 2 is 64, and the bandwidth corresponds to 500 KHz; the FFT point number of the bandwidth mode 3 is 32, corresponding to a 200KHz bandwidth. The frame lengths of all three OFDM symbol modes are 122.88 microseconds. Parameters of the communication bandwidth, FFT point number, effective carrier, etc. of the physical layer 3 bandwidth mode are shown in table 2.

TABLE 2 communication modes and Bandwidths

	Bandwidth mode 1	Bandwidth mode 2	Bandwidth mode 3
				Nominal bandwidth (kHz)	854.5	431.3	170.9
Channel spacing (kHz)	1000	500	200
				Number of FFT points	128	64	32
Effective number of subcarriers	104	52	20
				Number of pilot subcarriers	8	4	2
Number of data subcarriers	96	48	18

In step 102, the sending end physical layer performs SIG field data processing on the SIG data to obtain SIG time domain subframe data to be sent.

Fig. 3 is a flowchart of a data transmission process of the SIG field according to an embodiment of the present invention. As shown in fig. 3, the SIG field information is subjected to (36,3) transmission processing such as block coding, symbol padding and scrambling, and the specific steps include:

step 1, SIG domain forward error correction codes are adopted, FEC adopts (36,3) block codes, the encoding input length is 3 bits, and the encoding output length is 36 bits. The generator matrix of the (36,3) block code is as follows:

the (36,3) block code coding method comprises the following steps: 3 bits of data (b) to be inputted₀b₁b₂) Most significant bit (b) of₀) Multiplication by the first row, second bit (b) of the matrix G₁) Multiplication by the second row, third bit (b) of the matrix G₂) Multiply by the third row of matrix G; then the 3 values of each column are exclusive-ored, resulting in 36 bits and output as the encoding result.

Step 2, the SIG field is 36 bits after being coded, and is mapped to the position of an available data subcarrier of an OFDM symbol by adopting a BPSK constellation; the mapping is repeated continuously according to the sequence of the subcarrier sequence numbers from low to high and the OFDM symbol sequence numbers from low to high until all the data subcarriers of the used OFDM symbols are filled. The SIG field modulation and coding scheme and the occupied resource parameters are shown in table 3.

TABLE 3 modulation and coding scheme and resource occupation parameters of SIG field

Step 3, adding the bit stream after SIG domain coding and symbol fillingAnd (5) disturbance processing. The scrambling code generating polynomial is S (x) x¹⁰+x³+1. Based on the generator polynomial, a pseudo-random sequence is generated. And carrying out XOR operation on the SIG domain coded data and the pseudorandom sequence to obtain scrambled data. The initial value of the scramble code generation polynomial is all 1.

In step 103, the sending end physical layer performs PHR domain data processing on the PHR data according to the RM value of the PHR data posted by the SIG data, so as to obtain PHR time domain subframe data to be sent.

Preferably, the PHR domain data processing includes: forward error correction code (FEC) coding processing, channel interleaving processing, ROBO interleaving and diversity processing, constellation mapping processing and digital front end processing.

Preferably, wherein the method further comprises: and when the FEC coding processing is carried out on the PHR data, selecting a required coding method and a corresponding coding code rate according to the coding mode indicated by the RM value.

Preferably, wherein the method further comprises: and carrying out ROBO interleaving and diversity processing on the PHR data in a time domain and a frequency domain in a dispersing way so as to simultaneously cope with the communication scene under severe frequency selective fading and time-varying channels.

Fig. 4 is a flowchart of a data transmission process of a PHR domain according to an embodiment of the present invention. As shown in fig. 4, the encoding processing method of the PHR domain includes: forward error correction coding (using Turbo coding), channel interleaving, ROBO interleaving, diversity, etc. The control information transmitted by the PHR symbol is a sequence with the length of 128 bits, the control information of 128 bits is coded by Turbo coding according to the coding rate indication of SIG field, and then the coded information is processed by bit channel interleaving and symbol interleaving diversity processing. The 128-bit control information transmitted by the PHR symbol includes 24-bit CRC check information to assist the receiving end in determining whether the bit information obtained by decoding the current PHR field is correct. The input length of the Turbo coding block of the PHR is 128 bits (or 16 bytes, hereinafter abbreviated as PB16), two code rates of 1/2 and 4/5 are supported, and the corresponding coding output lengths are 256 bits and 160 bits, respectively, where the first 128 bits are information codes and the latter are check codes.

The steps of Turbo coding, channel interleaving, ROBO interleaving and diversity, constellation mapping and other transmission processing of the PHR information include:

step 1, selecting a corresponding coding code rate according to a coding mode indicated by the RM, and performing Turbo coding processing on PHR data.

The Turbo coding process comprises component coding, bit interleaving and puncturing. And according to the required code rate, performing punching output on the Turbo coding bits. The information bits are not punched, and the punching module only punches the p and q parity bits output by the ENC1 and the ENC2 and writes the parity bits into the parity output buffer in the original order. The puncturing patterns are shown in tables 4 and 5 for different code rates.

TABLE 4 puncturing Pattern with code Rate of 1/2

p	11111111
		q	11111111

TABLE 5 puncturing Pattern with code Rate of 4/5

p	10001000
		q	10001000

The specific process of punching comprises the following steps: setting a punching mode according to the code rate; according to a punching mode, punching the check bits in the Turbo coding bits, wherein 1 represents the reserved bits, and 0 represents the bits removed by punching; and finally, arranging and outputting the Turbo coding bits left after punching, sequentially outputting information bits and then outputting check bits.

And 2, randomizing the information bits and the check bits output by the Turbo encoder through a channel interleaver.

Wherein, the channel interleaving unit of the PHR is used to randomize the information bits and the check bits output from the Turbo encoder. The interleaver method may employ, but is not limited to, block interleaving, convolutional interleaving, pseudo-random interleaving, and the like.

And step 3, carrying out ROBO interleaving and diversity processing on the bit sequence output by the channel interleaving. Wherein the interleaving and diversity parameters are selected according to the interleaving diversity mode indicated by the RM.

ROBO interleaving and diversity are used to interleave and diversity map the original signal in time domain and frequency domain. When the number of PHR diversity indicated by the SIG field is 1, this link may be omitted. When the PHR diversity times indicated by the SIG field is more than 1, copying and copying the coded PHR data according to the diversity times, and then performing interleaving processing of two dimensions of a time domain and a frequency domain in each copy. The interleaver in the copy inner part can adopt but not limited to block interleaving, convolutional interleaving, pseudo-random interleaving and the like.

And 4, according to the modulation mode indicated by the RM, carrying out constellation mapping on the bit sequence output by the ROBO interleaving and diversity processing, and mapping the modulated symbols to all data subcarriers of the used OFDM symbols according to the sequence of the subcarrier sequence numbers from low to high and the sequence of the OFDM symbol numbers from low to high.

The PHR employs a ROBO interleaving manner more distributed in time and frequency domains at each diversity unit, which is more advantageous than the prior art. In each diversity unit of the control information in the prior art, interleaving processing is not performed, or block interleaving processing is performed simply, and the interleaving effect in the time domain and the frequency domain is not as robust as the control information performance of the invention.

In step 104, the physical layer of the transmitting end performs PSDU domain data processing on the PSDU data according to the resource allocation and transmission parameter information of the PSDU data determined based on the PHR data, so as to obtain PSDU time domain subframe data to be transmitted.

In step 105, the sending end physical layer multiplexes the SIG time domain subframe data, the PHR time domain subframe data, and the PSDU time domain subframe data with preamble data to obtain a complete baseband physical frame signal, and sends the complete baseband physical frame signal to the receiving end through the radio frequency front end.

In the embodiment of the present invention, the SIG field and PHR field frequency domain data obtained through the above processing are inserted into a Pilot (Pilot) subcarrier, a Direct Current (DC) subcarrier, and a Guard Tones (Guard Tones) as input of an N-point Inverse Fast Fourier Transform (IFFT), and the frequency domain to time domain conversion of the physical frame control information is completed through IFFT processing. And adding a cyclic prefix into the time domain signal, then performing processing such as up-sampling and filtering, and the like, and multiplexing the time domain signal with the synchronous preamble and the physical frame main load part to obtain a complete baseband physical frame signal. And finally, the signal is processed by radio frequency front end modules such as a digital-to-analog converter (DAC), an up-converter, a power amplifier and the like, and then is transmitted to a receiving end through an antenna.

Fig. 5 is a diagram of an example of transmission of communication physical frame control information according to an embodiment of the present invention. As shown in fig. 5, in the embodiment of the present invention, at the transmitting end, SIG field data, PHR field data, and PSDU data are prepared in the data link layer, where the data content of the SIG field (used to indicate RM information of the PHR field) may be adaptively adjusted according to measured indicators such as signal quality or communication success rate; at the physical layer, performing (36,3) linear block coding, symbol padding, scrambling processing and constellation mapping processing on SIG domain data (RM information used for indicating a PHR domain); performing Turbo coding, channel interleaving, ROBO interleaving and diversity on PHR domain data (including physical layer control information such as resource allocation, transmission parameters, frame length, MAC address and the like of PSDU load data), constellation mapping and other processing; and carrying out Turbo coding, channel interleaving, ROBO interleaving and diversity, constellation mapping and the like on the PSDU load data information. Mapping the processed SIG domain data, PHR domain data and PSDU data to OFDM symbol frequency domain subcarriers, inserting Pilot frequency (Pilot) subcarriers, Direct Current (DC) subcarriers and two-end protection subcarriers (Guardtons) as input of N-point IFFT, and completing the conversion from the physical frame main body frequency domain to the time domain through IFFT processing. And adding a cyclic prefix into the time domain signal, and then performing up-sampling and filtering processing. And performing IFFT on the given frequency domain synchronization sequence to obtain a time domain synchronization head sequence. And multiplexing the preamble synchronization head and the physical frame main part to obtain a complete baseband physical frame signal. And finally, the signal is processed by a radio frequency front end module such as a digital-to-analog converter (DAC), an up-converter, a power amplifier and the like, and then is transmitted out through an antenna.

According to the method for transmitting the control information of the physical frame with the two-stage structure, the control information in the transmitted physical frame is divided into a SIG domain and a PHR domain. Wherein, the SIG field carries a small number of information bits for indicating parameters necessary for receiving, such as modulation and coding scheme and/or diversity interleaving, adopted by the PHR field of the frame. Because the SIG field only carries a very small number of information bits, although the most robust modulation and coding scheme in the communication system is adopted, the occupied time-frequency resources are very limited. The PHR domain is a main body of control information, the control information which is transmitted to a physical layer by a communication upper layer is selected according to the parameter indication of the SIG domain, and a corresponding modulation coding and/or diversity interweaving mode is selected for processing and transmitting. By the control information double-stage sending structure, a sending end of communication can adaptively select appropriate sending parameters such as control information modulation coding and/or diversity interleaving aiming at the end-to-end signal transmission quality so as to realize the optimal efficiency of time-frequency resources of the whole control information section on the premise of successful communication. When the signal transmission quality of both communication parties is good, the transmitting end can select a modulation coding mode with higher spectrum efficiency (such as a higher-order modulation mode and a coding mode with higher code rate) and lower diversity times. On the premise of ensuring that the receiving end can correctly demodulate the control information, the time-frequency resource occupied by the control information in the physical frame can be greatly reduced, so that the length of the physical frame is shortened, the communication time delay is reduced, the collision probability with other communication competition frames is reduced, and the power consumption of communication equipment is reduced. When the signal transmission quality of both communication parties is poor, the transmitting end can select a modulation coding mode with lower spectrum efficiency (such as a modulation mode with a lower order and a coding mode with a lower code rate) and a higher diversity frequency, so as to provide higher processing gain, thereby maintaining the reliability of communication. The control information transmission method provided by the invention can overcome the defects that the prior art can not adaptively adapt to the channel quality, the physical frame length is fixed and unchanged, the system resource redundancy can not adaptively reduce and the like. In addition, corresponding control information resource scheduling parameters are designed according to a uniform sending rule aiming at different communication bandwidth modes, and the method can be flexibly used in application scenes of the Internet of things with different bandwidth requirements.

Fig. 6 is a schematic structural diagram of a system 600 for transmitting control information of a communication physical frame according to an embodiment of the present invention. As shown in fig. 6, a system 600 for transmitting control information of a communication physical frame according to an embodiment of the present invention includes: the system comprises a data receiving module 601, a SIG data processing module 602, a PHR data processing module 603, a PSDU data processing module 604 and a data transmitting module 605.

Preferably, the data receiving module 601 is configured to enable a physical layer at a sending end to receive signaling indication SIG data, physical frame control header PHR data, and service data unit PSDU data from a link layer; the SIG data and the PHR data form the communication physical frame control information and are transmitted through a two-stage time domain subframe structure, the first-stage time domain subframe data is the previous SIG data, and the second-stage time domain subframe data is the next PHR data; the SIG data carries a modulation mode, a coding mode and a diversity mode of the PHR data, and indicates through a rate mode parameter RM value that different RM values correspond to different modulation modes, coding modes and diversity modes; the PHR data carries the resource allocation of the PSDU data and the transmission parameter information corresponding to the PSDU domain.

Preferably, the SIG data processing module 602 is configured to enable a sending end physical layer to perform SIG domain data processing on the SIG data, so as to obtain SIG time domain subframe data to be sent.

Preferably, the PHR data processing module 603 is configured to enable a sending end physical layer to perform PHR domain data processing on the PHR data according to an RM value of the PHR data posted by the SIG data, so as to obtain PHR time domain subframe data to be sent.

Preferably, the PSDU data processing module 604 is configured to enable the sending end physical layer to perform PSDU domain data processing on the PSDU data according to the PSDU data resource allocation and sending parameter information determined based on the PHR data, so as to obtain PSDU time domain subframe data to be sent.

Preferably, the data sending module 605 is configured to enable the sending end physical layer to multiplex the SIG time domain subframe data, the PHR time domain subframe data, and the PSDU time domain subframe data with the preamble data to obtain a complete baseband physical frame signal, and send the complete baseband physical frame signal to the receiving end through the radio frequency front end.

The system 600 for sending the communication physical frame information according to the embodiment of the present invention corresponds to the method 100 for sending the communication physical frame information according to another embodiment of the present invention, and is not described herein again.

Fig. 7 is a flowchart of a method 700 for receiving control information of a communication physical frame according to an embodiment of the present invention. As shown in fig. 7, a receiving method 700 for communication physical frame control information according to an embodiment of the present invention starts from step 701, where a receiver of a physical layer at a receiving end performs radio frequency front end processing on a received signal to obtain a complete baseband physical frame signal, and completes physical frame synchronization and channel estimation by using a synchronization preamble symbol to complete demultiplexing and coherent demodulation of the baseband physical frame signal to obtain to-be-analyzed data of a SIG field, a PHR field, and a PSDU field in step 701.

In step 702, the physical layer at the receiving end parses the acquired data to be parsed in the SIG field according to the transmission parameter information corresponding to the known signaling indication field, so as to acquire an RM value of the PHR data, and determine a modulation mode, a coding mode, and a diversity mode of the PHR field.

In step 703, the physical layer at the receiving end parses the data to be parsed in the PHR domain according to the obtained RM value of the PHR data, so as to obtain the resource allocation and transmission parameter information of the PSDU domain.

In step 704, the physical layer at the receiving end parses the data to be parsed in the obtained PSUD domain according to the obtained resource allocation and transmission parameter information of the PSUD domain.

Preferably, wherein the method further comprises: judging whether the control information output by the current PHR domain decoding is correct or not according to the check bit in the acquired physical frame control information; if the physical frame control information is correct, analyzing the PSDU data according to the resource allocation and transmission parameter information of the PSDU data in the current physical frame control information; otherwise, it is determined that the acquired physical frame control information is incorrect, the reception of the PHR domain fails this time, and the current physical frame gives up the analysis of the PSDU data.

In the embodiment of the invention, at the receiving end, the received signal is processed by a radio frequency front end module such as a down converter, a Low Noise Amplifier (LNA), a filter, (ADC), an analog-to-digital converter and the like, and then converted to the baseband. And after physical frame synchronization and clock synchronization are completed by using the preamble symbol, the time domain signal is subjected to FFT (fast Fourier transform) to obtain frequency domain data. And performing channel estimation and frequency offset estimation by using the preamble sequence and the pilot sequence in the frequency domain data, and then performing coherent demodulation. And the SIG domain is subjected to descrambling, diversity combining and (36,3) packet decoding to obtain RM information of the PHR domain. The PHR and the load data are subjected to diversity combining, deinterleaving, depuncturing and Turbo decoding to obtain corresponding information; wherein the RM information of the PHR is indicated by SIG domain coding information; the resource allocation and transmission parameters of the load data are indicated by the control information obtained after decoding in the PHR domain. And descrambling the decoded load data and outputting the descrambled load data. The method specifically comprises the following steps:

step 1, a received signal is processed by a radio frequency front end module such as a down converter, a Low Noise Amplifier (LNA), a filter, (ADC), an analog-to-digital converter and the like and then converted to a baseband. And after the physical frame synchronization and the clock synchronization are completed by utilizing the synchronous preamble symbol, the time domain signal is subjected to FFT (fast Fourier transform) to sequentially obtain frequency domain data of the SIG domain, the PHR domain and the load data part. And performing channel estimation and frequency offset estimation by using a preamble sequence and a pilot sequence in the frequency domain data, and then performing coherent demodulation processing such as equalization and frequency offset compensation to obtain processed frequency domain data.

And 2, according to a coding modulation mode adopted by a known fixed signaling indication domain, carrying out descrambling, diversity combining and (36,3) grouping decoding treatment on the SIG domain frequency domain data obtained in the step 1 to obtain the information of the modulation mode, the coding mode and the diversity mode of the PHR domain.

And 3, obtaining RM parameters such as a modulation mode, a coding mode, a diversity interleaving mode and the like of the second-level physical frame control head according to the content of the first-level signaling indication domain analyzed in the step 2.

And 4, carrying out diversity combination, de-interleaving, de-punching and Turbo decoding on the PHR frequency domain data obtained by processing in the step 1 in sequence according to the RM parameter obtained in the step 3 to obtain a decoding result of the physical frame control information. And judging whether the control information output by the current decoding is correct or not according to the CRC check bit in the decoding result. If the CRC check is correct, parameters of resource allocation, a demodulation coding mode, a diversity mode and the like of the load data in the current physical frame in the control information are used for indicating the processing of demodulation, decoding and the like of the load data in the current physical frame. And analyzing the acquired data to be analyzed of the PSUD domain according to the acquired resource allocation and transmission parameter information of the PSDU domain. If the CRC is wrong, the decoded control information has errors, the reception of the PHR domain fails, and the current physical frame gives up the subsequent demodulation processing.

Fig. 8 is a schematic structural diagram of a receiving system 800 for communicating physical frame control information according to an embodiment of the present invention. As shown in fig. 8, a system 800 for receiving control information of a communication physical frame according to an embodiment of the present invention includes: a to-be-analyzed data acquisition module 801, a first analysis module 802, a second analysis module 803, and a third analysis module 804.

Preferably, the to-be-analyzed data obtaining module 801 is configured to enable a receiver of a receiving end physical layer to perform radio frequency front end processing on a received signal to obtain a complete baseband physical frame signal, and complete physical frame synchronization and channel estimation by using a synchronization preamble symbol to complete demultiplexing and coherent demodulation of the baseband physical frame signal, so as to obtain to-be-analyzed data of a SIG field, a PHR field, and a PSDU field.

Preferably, the first parsing module 802 is configured to enable the physical layer at the receiving end to parse the acquired data to be parsed in the SIG field according to the transmission parameter information corresponding to the known signaling indication field, so as to acquire an RM value of the PHR data, and determine a modulation mode, a coding mode, and a diversity mode of the PHR field.

Preferably, the second parsing module 802 is configured to enable the receiving end physical layer to parse the data to be parsed in the PHR domain according to the obtained RM value of the PHR data, so as to obtain resource allocation and transmission parameter information of the PSDU domain.

Preferably, the third parsing module 803 is configured to enable the receiving end physical layer to parse the acquired data to be parsed in the PSUD domain according to the acquired resource allocation and transmission parameter information of the PSUD domain.

The receiving system 800 for communicating physical frame information according to the embodiment of the present invention corresponds to the receiving method 700 for communicating physical frame information according to another embodiment of the present invention, and is not described herein again.

The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.

Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims

1. A method for transmitting control information of a communication physical frame, the method comprising:

a physical layer of a sending end receives signaling indication SIG data, PHR data of a physical frame control head and PSDU data of a service data unit from a link layer; the SIG data and the PHR data form the communication physical frame control information and are transmitted through a two-stage time domain subframe structure, the first-stage time domain subframe data is the previous SIG data, and the second-stage time domain subframe data is the next PHR data; the SIG data carries a modulation mode, a coding mode and a diversity mode of the PHR data, and indicates through a rate mode parameter RM value that different RM values correspond to different modulation modes, coding modes and diversity modes; the PHR data bears the resource allocation of the PSDU data and the transmission parameter information corresponding to the PSDU domain;

2. The method according to claim 1, wherein the sending-end physical layer performs SIG field data processing on the SIG data according to sending parameter information corresponding to a preset fixed signaling indication field.

3. The method of claim 1, further comprising:

4. The method according to claim 3, wherein the adaptively adjusting the RM value of the PHR data in real time comprises:

5. The method of claim 1, wherein the SIG domain data processing comprises: coding processing, symbol filling processing, scrambling processing, constellation mapping and digital front end processing.

6. The method of claim 1, wherein the PHR domain data processing comprises: forward error correction code (FEC) coding processing, channel interleaving processing, ROBO interleaving and diversity processing, constellation mapping processing and digital front end processing.

7. The method of claim 5, further comprising:

8. The method of claim 6, further comprising:

9. The method of claim 1, wherein the PSDU domain data processing comprises: scrambling processing, FEC coding processing, channel interleaving processing, ROBO interleaving and diversity processing, constellation mapping processing and digital front end processing.

10. The method of any one of claims 5, 6 and 9, wherein the digital front end processing comprises: at least one of frequency domain to time domain processing, upsampling processing, and shaping filtering processing.

11. A transmission system for communicating physical frame control information, the system comprising:

12. A method for receiving control information of a communication physical frame, the method comprising:

13. The method according to claim 12, wherein the parsing, by the physical layer at the receiving end, the acquired data to be parsed of the SIG field according to the transmission parameter information corresponding to the known signaling indication field includes:

14. The method according to claim 12, wherein the receiving physical layer parses the data to be parsed in the PHR domain according to the obtained RM value of the PHR data to obtain the physical frame control information, including:

15. The method of claim 12, further comprising:

16. A system for receiving control information of a communication physical frame, the system comprising: