CN106797280B - Data transmission method, system and terminal - Google Patents
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Abstract
A method of data transmission, comprising: a receiving terminal receives a data signal on a first carrier, wherein the data signal comprises a demodulation reference signal and at least two data blocks, and the transmission time length of the last data block in the at least two data blocks is not greater than the transmission time lengths of other data blocks; the receiving terminal carries out demodulation decoding processing on the at least two data blocks according to the demodulation reference signal; and when the first preset time is reached, the receiving terminal sends a short control signal on the first carrier, wherein the short control signal comprises the response information of the at least two data blocks. The invention is used for improving the data demodulation and decoding speed and realizing the coexistence of communication equipment.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a data transmission method, system, and terminal.
Background
With the development of wireless communication technology, wireless communication systems will develop towards network convergence, and the purpose is to comprehensively utilize multiple wireless access technologies and multiple wireless communication modes to improve the spectrum utilization rate and the network capacity. Among them, D2D communication is a hot spot in a new communication technology introduced in a Long Term Evolution (LTE) network architecture proposed by the 3rd Generation Partnership Project (3 GPP), which allows two terminals located relatively close to each other in a cellular network to communicate directly through a specific channel.
D2D communication mainly includes discovery between D2D devices in public safety scenarios with network coverage, and broadcast communication between D2D devices in scenarios with and without network coverage, and the same licensed spectrum resources as those of cell terminals are used in this process.
The frequency spectrum resources are divided into licensed frequency spectrum resources and unlicensed frequency spectrum resources, which are uniformly managed and controlled by the country, and different wireless communication systems are licensed to different frequency bands to avoid interference between the systems. Current D2D traffic occupies a portion of the uplink spectrum resources that are licensed. However, since the licensed spectrum resources are more precious than the unlicensed spectrum resources, it is becoming a development trend of the wireless communication technology to offload traffic of D2D communication to the unlicensed spectrum resources to achieve network capacity offloading.
Disclosure of Invention
The embodiment of the invention provides a data transmission method, a data transmission system and a user terminal, which are used for improving the data demodulation and decoding speed and realizing the coexistence of communication equipment.
A first aspect of the present invention provides a data transmission method, which may include:
a receiving terminal receives a data signal on a first carrier, wherein the data signal comprises a demodulation reference signal and at least two data blocks, and the transmission time length of the last data block in the at least two data blocks is not greater than the transmission time lengths of other data blocks;
the receiving terminal carries out demodulation decoding processing on the at least two data blocks according to the demodulation reference signal;
and after a first preset time, the receiving terminal sends a short control signal on the first carrier, the short control signal comprises response information of the at least two data blocks, and the first preset time is the interval time from the end time of receiving the data signal to the start time of sending the short control signal.
With reference to the first aspect, in a first possible implementation manner, the transmission time length of each of the at least two data blocks is the same; or, the transmission time lengths of the other data blocks except the last data block in the at least two data blocks are the same.
With reference to the first aspect or the first possibility of the first aspect, in a second possible implementation manner, the first preset time is not less than a transition time of the receiving terminal from a receiving state to a sending state.
A second aspect of the present invention provides a data transmission method, which may include:
a sending terminal acquires data to be sent, and divides the data to be sent into at least two data blocks, wherein the transmission time length of the last data block in the at least two data blocks is not more than the transmission time lengths of other data blocks;
the sending terminal sends a data signal to a receiving terminal on a first carrier, wherein the data signal comprises a demodulation reference signal and the at least two data blocks;
and after a second preset time, the sending terminal receives a short control signal, the short control signal comprises response information of the at least two data blocks, and the second preset time is the interval time from the end time of sending the data signal to the start time of receiving the short control signal.
With reference to the second aspect, in a first possible implementation manner, the transmission time length of each of the at least two data blocks is the same; or, the transmission time lengths of the other data blocks except the last data block in the at least two data blocks are the same.
With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner, the second preset time is not less than a first preset time, and the first preset time is an interval time from an end time of receiving the data signal to a start time of sending the short control signal by the receiving terminal.
A third aspect of the present invention provides a terminal, which may include:
a receiving module, configured to receive a data signal on a first carrier, where the data signal includes a demodulation reference signal and at least two data blocks, and a transmission time length of a last data block of the at least two data blocks is not greater than transmission time lengths of other data blocks;
the processing module is used for demodulating and decoding the at least two data blocks according to the demodulation reference signal;
a sending module, configured to send a short control signal on the first carrier after a first preset time, where the short control signal includes response information of the at least two data blocks, and the first preset time is an interval time from an end time of receiving the data signal to a start time of sending the short control signal.
A fourth aspect of the present invention provides a terminal, which may include:
the processing module is used for acquiring data to be transmitted and dividing the data to be transmitted into at least two data blocks, wherein the transmission time length of the last data block in the at least two data blocks is not more than the transmission time lengths of other data blocks;
a sending module, configured to send a data signal to a receiving terminal on a first carrier, where the data signal includes a demodulation reference signal and the at least two data blocks;
and the receiving module is used for receiving a short control signal after a second preset time, wherein the short control signal comprises response information of the at least two data blocks, and the second preset time is the interval time from the end time of sending the data signal to the start time of receiving the short control signal by the sending terminal.
A fifth aspect of the present invention provides a data transmission system, which may include: a transmitting terminal and a receiving terminal; wherein the sending terminal is the terminal provided in the fourth aspect, and the receiving terminal is the terminal provided in the third aspect.
It can be seen that, in the embodiment of the present invention, a receiving terminal receives a data signal on a first carrier, where the data signal includes a demodulation reference signal and at least two data blocks, and a transmission time length of a last data block of the at least two data blocks is not greater than transmission time lengths of other data blocks, and then the receiving terminal performs demodulation and decoding processing on the at least two data blocks according to the demodulation reference signal in the data signal, and when a first preset time elapses, the receiving terminal sends a short control signal through the first carrier, and the short control signal carries response information for the data blocks. In the embodiment of the invention, the data block is used as a unit for demodulation and decoding, the received data block can be demodulated and decoded by using the transmission time of the following data block, so that the aim of reducing the demodulation and decoding time is achieved, meanwhile, the response information of the data block is sent by adopting a short control signal, the detection of a carrier corresponding channel is not needed, the collision is reduced, and the coexistence between communication devices is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a data transmission method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a data transmission method according to another embodiment of the present invention;
fig. 3a is a schematic diagram of a transmission process of a data transmission method according to an embodiment of the present invention;
fig. 3b is a schematic diagram of a transmission process of a data transmission method according to another embodiment of the present invention;
fig. 3c is a schematic diagram of a transmission process of a data transmission method according to another embodiment of the present invention;
fig. 3d is a schematic diagram of a transmission process of a data transmission method according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a terminal according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a data transmission device according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a data transmission method, which is used for improving the data demodulation and decoding speed and realizing the coexistence of communication equipment. The invention also correspondingly provides a data transmission system and a terminal.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Unlicensed spectrum is briefly introduced first, along with the current coexistence specifications for unlicensed spectrum.
Resource sharing on the unlicensed spectrum means that only the limit on indexes such as transmission power, out-of-band leakage and the like is specified for the use of a specific spectrum, so as to ensure that basic coexistence requirements are met among a plurality of wireless communication devices which commonly use the spectrum, and the resource sharing on the unlicensed spectrum does not limit radio technologies, operation enterprises and service lives but also does not ensure the service quality of the wireless communication devices. The purpose of network capacity offloading can be achieved by using the unlicensed spectrum resources by the operator, but the operator needs to comply with the regulatory requirements of different regions and different spectrums on the unlicensed spectrum resources. These requirements are usually made to protect public systems such as radar, and to ensure that multiple systems coexist fairly without causing harmful effects to each other as much as possible, including transmit power limitations, out-of-band leakage indicators, indoor and outdoor usage limitations, and in some regions, some additional coexistence strategies.
The unlicensed spectrum considered for D2D communication is an unlicensed band of 5GHz opened by governments of various countries, and its coexistence specifications include Transmit Power Control (TPC), Dynamic Frequency Selection (DFS), channel occupation bandwidth and Listen Before Talk (LBT), etc. For example, 5.25 to 5.35GHz and 5.47 to 5.725GHz are working frequency bands of a global radar system, and in order to avoid interference of wireless communication equipment working in the 5GHz frequency band on the radar system, the wireless communication equipment must have two functions of TPC and DFS. The TPC is to prevent the wireless communication device from emitting excessive power to interfere with the radar system, and the DFS is to make the wireless communication device actively detect the frequency used by the radar system and actively select another frequency to avoid the frequency used by the radar system. The requirement of the occupied bandwidth of the channel is that when the wireless communication device operates on the 5G frequency band, the occupied channel bandwidth should reach 80% -100% of the alleged channel bandwidth. LBT is an intersystem coexistence policy, and a wireless communication system needs to use an LBT rule when occupying an unlicensed spectrum for communication, that is, a wireless communication device first monitors whether a channel is idle before using the channel, and can use the channel on the unlicensed spectrum if the channel is idle, but the time for occupying the channel is limited, and after the time for occupying the channel reaches a maximum limit, the unlicensed spectrum must be released for a period of time, and before occupying the channel on the unlicensed spectrum for the next time, the wireless communication system must again monitor whether the channel is idle.
According to the current regulations of european legislation, when a wireless communication device is used in an unlicensed spectrum, it is necessary to meet the requirements of a listen-before-talk mechanism of a Frame-based device (FBE) or a Load-based device (LBE). However, one exception is short control signaling, where short control signaling refers to a wireless communication device directly transmitting management and control frames (e.g., ACK/NACK signals) without detecting whether the channel is occupied by another device. If the short control signal transmission is performed, the maximum duty ratio at which the device transmits the short control signal within the observation time of 50ms is 5%.
What the embodiments of the present invention are to achieve is how to utilize unlicensed spectrum to complete D2D communication in an LTE system.
Wherein, the D2D communication of the LTE system follows the subframe structure of the LTE system. Specifically, the minimum time unit for D2D communication transmission may be one Orthogonal Frequency Division Multiplexing (OFDM) symbol in the LTE system. In the LTE system, the length of one subframe is 1 ms. A subframe of a Normal Cyclic Prefix (NCP) subframe format includes 14 OFDM symbols, numbered from 0 to 13, where the numbers 0 to 6 are first slots and the numbers 7 to 13 are second slots. A subframe of a long cyclic prefix (ECP) subframe format includes 12 OFDM symbols, which are numbered from 0 to 11, where 0 to 5 are first slots and 6 to 11 are second slots.
Based on the above description, an embodiment of the present invention provides a data transmission method, which improves a transmission rate, reduces demodulation and decoding time, and implements coexistence between communication devices, where the method may include: a receiving terminal receives a data signal on a first carrier, wherein the data signal comprises a demodulation reference signal and at least two data blocks, and the transmission time length of the last data block in the at least two data blocks is not greater than the transmission time lengths of other data blocks; the receiving terminal carries out demodulation decoding processing on the at least two data blocks according to the demodulation reference signal; and when the first preset time is reached, the receiving terminal sends a short control signal on the first carrier, wherein the short control signal comprises the response information of the at least two data blocks.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a data transmission method according to an embodiment of the present invention; as shown in fig. 1, a data transmission method may include:
101. a receiving terminal receives a data Signal on a first carrier, wherein the data Signal comprises a Demodulation Reference Signal (DMRS) and at least two data blocks, and a transmission time length of a last data block of the at least two data blocks is not greater than transmission time lengths of other data blocks;
it should be understood that the demodulation reference signal is a reference signal used for demodulation coding of the at least two data blocks.
In the process of implementing step 101, optionally, the first carrier may be a carrier on an unlicensed spectrum, or may be a carrier on a licensed spectrum.
In the process of embodying step 101, the receiving terminal receives a data signal comprising at least two data blocks on a first carrier. It is understood that a data Block, also called Transport Block (TB), is an independent Codeword (coded), and has an independent Transport Block Cyclic Redundancy Check (TB-CRC) and Modulation and Coding Scheme (MCS), and the receiving terminal can demodulate and decode each data Block.
In one embodiment, the transmission time length of each of the at least two data blocks is equal. Optionally, in this case, the last data block may adopt a low-order MCS to reduce the demodulation and decoding processing time of the receiving terminal for the last data block, which needs to be described. Optionally, in this case, the transmission time length of the last data block is sufficient for the receiving terminal to use for the demodulation decoding process and/or feedback information preparation of the second to last data block, thereby reducing the processing delay of the receiving terminal from receiving the transmission.
In one embodiment, the transmission time lengths of the other data blocks except the last data block in the at least two data blocks are equal, and the transmission time length of the last data block is smaller than that of the other data blocks. It should be understood that, in general, the shorter the transmission time, the shorter the demodulation and decoding time required for the data block. In this case, the shortest transmission time is used for the last data block, and the time for the receiving terminal to demodulate and decode the last data block can be reduced. Optionally, in this case, the transmission time length of the last data block is sufficient for the receiving terminal to use for the demodulation decoding process and/or feedback information preparation of the second to last data block, thereby reducing the processing delay of the receiving terminal from receiving the transmission.
In another embodiment, the transmission time lengths of the data blocks in the at least two data blocks are not equal, but the transmission time length of the last data block is the shortest. Optionally, starting from the first data block of the at least two data blocks, the transmission time length of the data block is decreased, that is, the transmission time length of the first data block is the longest, the transmission time length of the second data block is the next, and so on, the transmission time length of the last data block is the shortest. It should be understood that, in general, the smaller the transmission time length, the shorter the demodulation decoding time required for the data block. In this case, the shortest transmission time is used for the last data block, and the time for the receiving terminal to demodulate and decode the last data block can be reduced. Optionally, in this case, the transmission time length of the last data block is sufficient for the receiving terminal to use for the demodulation decoding process and/or feedback information preparation of the second to last data block, thereby reducing the processing delay of the receiving terminal from receiving the transmission.
In the process of implementing step 101, optionally, a time unit of the transmission time length of any one of the at least two data blocks may be an OFDM symbol or a subframe.
In the process of implementing step 101, optionally, the data signal further includes at least one of the following information: the Reference Signal for synchronization, the Reference Signal for Reference Signal Received Power (RSRP) measurement, the Reference Signal for Channel State Information (CSI) measurement, the Reference Signal for interference measurement, the Reference Signal for position measurement, the resource allocation Information corresponding to the at least two data blocks, and the MCS Information corresponding to the at least two data blocks.
102. The receiving terminal carries out demodulation decoding processing on the at least two data blocks according to the demodulation reference signal, wherein the demodulation decoding processing mode comprises that when the next data block is received, the last data block is demodulated and decoded;
it is understood that the demodulation decoding process of the present invention includes demodulation of a data block, decoding, and preparation of response information of the data block according to the result of the demodulation decoding.
In the process of step 102, since the receiving terminal receives at least two data blocks, and the receiving terminal can perform demodulation and decoding processing in units of data blocks, that is, after receiving the first data block, the receiving terminal can demodulate and decode the first data block according to the demodulation reference signal, that is, when receiving the next data block, the terminal can demodulate and decode the previous data block or even the previous data block, and when receiving the last data block, the last data block and the previous data block may have completed demodulation and decoding, so that when receiving the last data block, the last data block is demodulated and decoded, compared with the prior art, the demodulation and decoding time in the embodiment of the present invention is equivalent to the demodulation and decoding time of the last data block, thereby achieving full utilization of data transmission time, thereby achieving the purpose of reducing the processing time of demodulation and decoding.
In the process of the specific implementation step 102, optionally, when the data signal further includes resource allocation information corresponding to the at least two data blocks, the receiving terminal determines time domain positions and/or frequency domain positions and/or spatial domain positions of the at least two data blocks according to the resource allocation information corresponding to the at least two data blocks, and further performs demodulation and decoding processing on the at least two data blocks. Optionally, when the data signal further includes MCS information corresponding to the at least two data blocks, the receiving terminal determines an MCS of the at least two data blocks according to the MCS information corresponding to the at least two data blocks, and further performs demodulation and decoding processing on the at least two data blocks.
In the embodiment of the present invention, the response information carried in the short control signal is subjected to encoding, modulation, mapping, and other processing before being sent to the sending terminal.
In the process of implementing step 102, optionally, when the data signal further includes a reference signal for synchronization, the receiving terminal determines timing information and/or frequency offset information of the receiving terminal and the transmitting terminal according to the reference signal for synchronization. Optionally, when the data Signal further includes a Reference Signal for RSRP measurement, the receiving terminal determines an RSRP measurement result and/or a Reference Signal Received Quality (RSRQ) measurement result and/or a Received Signal Strength Indicator (RSSI) measurement result according to the Reference Signal for RSRP measurement. Optionally, when the data signal further includes a reference signal for CSI, the receiving terminal determines a CSI feedback message of the terminal according to the reference signal for CSI, and specifically, the CSI feedback message may include Channel Quality Indicator (CQI) information, Precoding Matrix Indicator (PMI) information, and/or Rank Indicator (RI) information. Optionally, when the data signal further includes a reference signal for interference measurement, the receiving terminal determines an interference measurement result of the receiving terminal according to the reference signal for interference measurement. Optionally, when the data signal further includes a reference signal for position measurement, the receiving terminal determines the position information of the receiving terminal according to the reference signal for position measurement. It is to be understood that reference signals having a plurality of different functions may be the same reference signal. For example, a Cell-specific Reference Signal (CRS) in the LTE system may be used for the terminal to determine time-frequency synchronization information, for the terminal to determine RSRP, RSRQ, or RSSI measurement results, and for demodulation and decoding of data blocks.
When the data signal further includes the optional information, timing information, frequency offset information, RSRP measurement results, RSRQ measurement results, RSSI measurement results, interference measurement results, or location information of the receiving terminal is obtained after demodulating and decoding the optional information, and at least one of these pieces of information is sent to the sending terminal as control information and response information of the data block.
103. And after a first preset time, the receiving terminal sends a short control signal on the first carrier, the short control signal comprises response information of the at least two data blocks, and the first preset time is the interval time from the end time of receiving the data signal to the start time of sending the short control signal.
In the embodiment of the present invention, when the receiving terminal transmits the response information of the data block by using the short control signal on the first carrier, it is not necessary to detect whether the channel of the first carrier is idle.
In the process of implementing step 103, considering that a first time is required for the receiving terminal to transition from the receiving state to the transmitting state, the first preset time should be not less than the first time.
For example, if the first time is 20us, that is, 20us is required for the receiving terminal to switch from the receiving state to the transmitting state after receiving the data signal, the first preset time may be 30us, and at the end time of the 30us, that is, at the end time of the 30us when the receiving terminal completes receiving the data signal, the receiving terminal needs to transmit the response information to the transmitting terminal, so that the transmitting terminal can correctly receive and demodulate the response information of the decoded data block, and during the first time, the duty ratio of the first carrier is large, so that collision between the communication devices can be reduced.
Optionally, the receiving terminal needs to consume a second time for the demodulation and decoding processing of the last received data block, and the first preset time is not less than the second time interval. In this case, the receiving terminal starts to demodulate and decode the data block after receiving the data block, and the transmission time of the last data block can be used for demodulating and decoding the second to last data block, so that after the receiving terminal receives the last data block, the receiving terminal can send the response information to the sending terminal only by demodulating and decoding the last data block, and in this case, the first preset time is not less than the second time consumed by the demodulating and decoding process of the last data block.
In the process of implementing step 103, optionally, the short control signal further includes control information, where the control information may include at least one of timing information, frequency offset information, RSRP measurement result, RSRQ measurement result, RSSI measurement result, CSI measurement result, interference measurement result, and terminal location information.
Therefore, in the process of implementing step 103, the sending, by the receiving terminal, a short control signal on the first carrier includes: the receiving terminal sends the control information and the response information of the at least two data blocks on the first carrier wave through frequency division multiplexing or code division multiplexing; or, the terminal transmits the control information and the response information of the at least two data blocks on the first carrier by adopting time division multiplexing. The control information can be sent first, then the response information of the data block is sent, and further more time is won for demodulating and decoding the last data block and the information to be sent; alternatively, if the first preset time is sufficient for demodulation of the decoded and ready-to-transmit information, the control information is transmitted together with the response information of the data block.
It can be seen that, in the embodiment of the present invention, a receiving terminal receives a data signal on a first carrier, where the data signal includes a demodulation reference signal and at least two data blocks, and a transmission time length of a last data block of the at least two data blocks is not greater than transmission time lengths of other data blocks, and then the receiving terminal performs demodulation and decoding processing on the at least two data blocks according to the demodulation reference signal in the data signal, and after a first preset time, the receiving terminal sends a short control signal through the first carrier, where the short control signal carries response information to the data block. In the embodiment of the invention, the demodulation and decoding can be carried out by taking the data block as a unit, so that the transmission time of other data blocks is fully utilized to demodulate and decode the received data block, thereby realizing the purpose of reducing the processing time of the demodulation and decoding.
The above embodiments are directed to a specific scheme for describing the data transmission method in detail from the receiving terminal side, and will be further described below from the sending terminal side. Referring to fig. 2, fig. 2 is a schematic flow chart illustrating a data transmission method according to some embodiments of the present invention; as illustrated in fig. 2, a data transmission method may include:
201. a sending terminal acquires data to be sent and divides the data to be sent into at least two data blocks;
the transmission time length of each data block in the at least two data blocks is equal, and the last data block can adopt a low-order MCS; or the transmission time lengths of other data blocks except the last data block in the at least two data blocks are equal, and the transmission time length of the last data block is smaller than that of the other data blocks; or the transmission time lengths of the data blocks in the at least two data blocks are not equal, but the transmission time length of the last data block is shortest. For details, reference may be made to detailed descriptions of the data blocks in the embodiment shown in fig. 1, and details are not described here again.
Optionally, a time unit of the transmission time length of any one of the at least two data blocks may be an OFDM symbol, or may be a subframe.
Optionally, the data signal further includes at least one of the following information: reference signals for synchronization, reference signals for RSRP measurement, reference signals for CSI measurement, reference signals for interference measurement, reference signals for position measurement, resource allocation information corresponding to the at least two data blocks, and MCS information corresponding to the at least two data blocks.
202. The sending terminal sends a data signal to a receiving terminal on a first carrier, wherein the data signal comprises a demodulation reference signal and the at least two data blocks, so that the receiving terminal demodulates and decodes the previous data block when receiving the next data block;
it should be noted that the first carrier in the embodiment of the present invention may be a carrier on an unlicensed spectrum, or may be a carrier on a licensed spectrum. The first carrier in the embodiment of the present invention and the first carrier described in the above embodiment are the same carrier.
Optionally, before sending the data signal, the receiving terminal may monitor whether the first carrier on the unlicensed or licensed spectrum is idle based on a listen-before-talk mechanism, and send the data signal from the first carrier when it is determined that the first carrier is idle.
203. And after a second preset time, the sending terminal receives a short control signal, the short control signal comprises response information of the at least two data blocks, and the second preset time is the interval time from the end time of sending the data signal to the start time of receiving the short control signal.
And the second preset time is not less than a first preset time, and the first preset time is the interval time from the end time of receiving the data signal to the start time of sending the short control signal by the receiving terminal.
In some embodiments of the present invention, the second preset time in the embodiments of the present invention may be the first preset time in the embodiments described above. For example, if the first preset time is 30us, the second preset time may be 30us, that is, the transmitting terminal starts to receive the short control signal transmitted by the terminal from the end time of the 30us where the data signal is transmitted. Optionally, before the receiving terminal sends the short control signal, the sending time advance is determined according to the synchronous reference signals of the receiving terminal and the sending terminal, so that the sending terminal can correctly receive the short control signal at a second preset time.
In other embodiments of the present invention, since the signal needs a certain time in the transmission process, the second preset time in the embodiment of the present invention may be slightly longer than the first preset time in the above embodiments. For example, if the first preset time is set to 30us and the minimum delay time of the unidirectional signal transmission is 1us, the second preset time may be set to 32us, that is, the sending terminal receives the short control signal sent by the receiving terminal from the end time of the 32us where the sending terminal finishes sending the data signal.
It can be seen that, in the embodiment of the present invention, the sending terminal divides the data to be sent into at least two data blocks, and the transmission time length of the last data block is not greater than the transmission time lengths of other data blocks, so that the receiving terminal can perform demodulation and decoding processing in units of data blocks, improve the demodulation processing time, and can switch the receiving terminal from receiving data signals to sending short control signals as soon as possible, complete the feedback to the sending terminal as soon as possible, and reduce the collision between the terminal and other communication devices. Meanwhile, the sending terminal receives the response information in the second preset time, and can correctly demodulate and decode the response information of the sent data block to complete the whole data transmission.
Optionally, the data signal further includes at least one of the following information: reference signals for synchronization, reference signals for RSRP measurement, reference signals for CSI measurement, reference signals for interference measurement, reference signals for position measurement, resource allocation information corresponding to the at least two data blocks, and MCS information corresponding to the at least two data blocks. It is to be understood that reference signals having a plurality of different functions may be the same reference signal. For example, a cell common reference signal CRS in the LTE system may be used by the terminal to determine time-frequency synchronization information, or may be used by the terminal to determine RSRP, RSRQ, or RSSI measurement results.
In one embodiment, when the data signal may further include at least one of resource allocation information and MCS information in addition to the at least two data blocks and the demodulation reference signal, and optionally may further include other reference signals, the procedure of the data transmission method according to the embodiment of the present invention may specifically include the cases as shown in fig. 3a to 3d (in fig. 3a to 3d, SA includes at least one of resource allocation information and MCS information, and RS denotes at least one reference signal, it should be understood that fig. 3a to 3d are considered from the perspective of the receiving terminal.):
as shown in fig. 3a, the sending terminal places the SA between RSs for transmission, sends the SA and the RSs, and sends the data block; when the first preset time is reached, the receiving terminal feeds back the response information and the control information of the data block, wherein in fig. 3a, the response information and the control information are transmitted together.
As shown in fig. 3b, the transmitting terminal transmits the SA and the RS together; when the first preset time is reached, the receiving terminal firstly feeds back the control information and feeds back the response information one by one, and more time is won for the receiving terminal to demodulate and decode the last data block;
as shown in fig. 3c, the transmitting terminal transmits RS first, and SA is transmitted before the data block; when the first preset time is up, the control information and the response information are sent together;
as shown in fig. 3d, the transmitting terminal transmits RS first, then SA, and then transmits data block; and when the first preset time is up, the receiving terminal firstly feeds back the control information and then sends the response information.
Alternatively, the short control signal may occupy one or more symbols.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a terminal 400 according to an embodiment of the present invention, as shown in fig. 4, the terminal 400 corresponding to the data transmission method shown in fig. 1 may include:
a receiving module 410, configured to receive a data signal on a first carrier, where the data signal includes a demodulation reference signal and at least two data blocks, and a transmission time length of a last data block of the at least two data blocks is not greater than transmission time lengths of other data blocks;
a processing module 420, configured to perform demodulation and decoding processing on the at least two data blocks according to the demodulation reference signal, where the demodulation and decoding processing includes performing demodulation and decoding on a previous data block when a next data block is received;
a sending module 430, configured to send a short control signal on the first carrier after a first preset time, where the short control signal includes response information of the at least two data blocks, and the first preset time is an interval time from an end time of receiving the data signal to a start time of sending the short control signal.
It can be seen that the receiving module 410 receives a data signal on a first carrier, where the data signal includes a demodulation reference signal and at least two data blocks, and a transmission time length of a last data block of the at least two data blocks is not greater than transmission time lengths of other data blocks, then the processing module 420 performs demodulation and decoding processing on the at least two data blocks according to a demodulation reference signal in the data signal, and after a first preset time, the sending module 430 sends a short control signal through the first carrier, where the short control signal carries response information to the data block. In the embodiment of the invention, the data block is used as a unit for demodulation and decoding, the received data block can be demodulated and decoded by using the transmission time of the following data block, so that the aim of reducing the demodulation and decoding time is achieved, meanwhile, the response information of the data block is sent by adopting a short control signal, the detection of a carrier corresponding channel is not needed, the collision is reduced, and the coexistence between communication devices is realized.
In some possible embodiments of the present invention, the transmission time length of each of the at least two data blocks is the same; or, the transmission time lengths of the other data blocks except the last data block in the at least two data blocks are the same.
Preferably, the first preset time is not less than a transition time of the terminal from the receiving state to the transmitting state.
Optionally, the demodulation reference signal includes at least one of the following information: reference signals for synchronization, reference signals for RSRP measurement, reference signals for CSI, reference signals for interference measurement, reference signals for position measurement, resource allocation information corresponding to the at least two data blocks, and MCS information corresponding to the at least two data blocks.
Optionally, the short control signal further includes control information, and the control information includes at least one of the following information: timing information, frequency offset information, RSRP measurement results, Reference Signal Received Quality (RSRQ) measurement results, Received Signal Strength Indication (RSSI) measurement results, CSI measurement results, interference measurement results and terminal position information.
In some implementations of the present invention, the sending module 430 is specifically configured to send the control information and the response information of the at least two data blocks on the first carrier by frequency division multiplexing or code division multiplexing; or, the control information and the acknowledgement information of the at least two data blocks are transmitted on the first carrier by time division multiplexing.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a terminal 500 according to an embodiment of the present invention; as shown in fig. 5, the terminal 500 corresponding to the transmission method shown in fig. 2 may include:
a processing module 510, configured to obtain data to be sent, and divide the data to be sent into at least two data blocks, where a transmission time length of a last data block in the at least two data blocks is not greater than transmission time lengths of other data blocks;
a sending module 520, configured to send a data signal to a receiving terminal on a first carrier, where the data signal includes a demodulation reference signal and the at least two data blocks, so that the receiving terminal demodulates and decodes a previous data block when receiving a next data block;
a receiving module 530, configured to receive a short control signal after a second preset time, where the short control signal includes response information of the at least two data blocks, and the second preset time is an interval time from an end time of sending the data signal to a start time of receiving the short control signal by the sending terminal.
In some possible embodiments of the present invention, the transmission time length of each of the at least two data blocks is the same; or, the transmission time lengths of the other data blocks except the last data block in the at least two data blocks are the same.
In some possible embodiments of the present invention, the second preset time is not less than a first preset time, and the first preset time is an interval time from an end time of receiving the data signal to a start time of sending the short control signal by the receiving terminal.
Optionally, the data signal further comprises at least one of the following information: the reference signal used for synchronization, the reference signal used for Reference Signal Received Power (RSRP) measurement, the reference signal used for Channel State Information (CSI) measurement, the reference signal used for interference measurement, the reference signal used for position measurement, resource allocation information corresponding to the at least two data blocks and Modulation Coding Scheme (MCS) information corresponding to the at least two data blocks.
Optionally, the short control signal further includes control information, and the control information includes at least one of the following information: timing information, frequency offset information, RSRP measurement results, Reference Signal Received Quality (RSRQ) measurement results, Received Signal Strength Indication (RSSI) measurement results, CSI measurement results, interference measurement results and terminal position information.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention; as shown in fig. 6, a data transmission system may include: a transmitting terminal 610 and a receiving terminal 620;
the sending terminal 610 is the terminal 500, and the receiving terminal 620 is the terminal 400.
Please refer to the above method embodiments, and the embodiments shown in fig. 4 and fig. 5, which will not be described herein again for the detailed descriptions of the sending terminal 610 and the receiving terminal 620.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a data transmission device according to an embodiment of the present invention, which may include at least one processor 701 (e.g., a CPU, a Central Processing Unit), at least one network interface or other communication interfaces, a memory 702, a receiver 703, a transmitter 704, and at least one communication bus, for implementing connection and communication between these devices. The processor 701 is configured to execute an executable module, such as a computer program, stored in the memory. The Memory 702 may include a high-speed Random Access Memory (RAM) and may also include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication connection between the system gateway and at least one other network element is realized through at least one network interface (which can be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network and the like can be used.
As shown in fig. 7, in some embodiments, the memory 702 stores program instructions, and the program instructions can be executed by the processor 701, and the processor 701 specifically executes the following steps: triggering a receiver 703 to receive a data signal on a first carrier, where the data signal includes a demodulation reference signal and at least two data blocks, where the transmission time length of the last data block in the at least two data blocks is not greater than the transmission time lengths of other data blocks, then performing demodulation and decoding processing on the at least two data blocks received by the receiver 703 according to the demodulation reference signal, and triggering the transmitter 704 to transmit a short control signal on the first carrier after a first preset time, where the short control signal includes response information of the at least two data blocks, and the first preset time is an interval time from an end time of receiving the data signal to a start time of transmitting the short control signal by the receiving terminal;
or,
in some embodiments, the memory 702 stores program instructions, and the program instructions are executable by the processor 701, and the processor 701 specifically performs the following steps: acquiring data to be transmitted, and dividing the data to be transmitted into at least two data blocks, wherein the transmission time length of the last data block in the at least two data blocks is not more than the transmission time lengths of other data blocks; triggering the transmitter 704 to transmit a data signal to a receiving terminal on a first carrier, the data signal comprising a demodulation reference signal and the at least two data blocks; triggering the receiver 703 to receive a short control signal after a second preset time, where the short control signal includes response information of the at least two data blocks, and the second preset time is an interval time from an end time of sending the data signal to a start time of receiving the short control signal by the sending terminal.
In some embodiments, the transmitter 704 is specifically configured to transmit the control information and the acknowledgement information of the at least two data blocks on the first carrier by frequency division multiplexing or code division multiplexing; or, the control information and the acknowledgement information of the at least two data blocks are transmitted on the first carrier by time division multiplexing.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
While the data transmission method, system and terminal provided by the present invention have been described in detail, for those skilled in the art, the idea of the embodiment of the present invention may be changed in the specific implementation and application scope, and in summary, the content of the present description should not be construed as limiting the present invention.
Claims (23)
1. A method of data transmission, comprising:
a receiving terminal receives a data signal on a first carrier, wherein the data signal comprises a demodulation reference signal and at least two data blocks, and the transmission time length of the last data block in the at least two data blocks is not greater than the transmission time lengths of other data blocks;
the receiving terminal carries out demodulation decoding processing on the at least two data blocks according to the demodulation reference signal, wherein the demodulation decoding processing mode comprises that when the next data block is received, the last data block is demodulated and decoded;
after a first preset time, the receiving terminal sends a short control signal on the first carrier, the short control signal includes response information of the at least two data blocks, the first preset time is an interval time from an end time of receiving the data signal to a start time of sending the short control signal, and the short control signal refers to a management and control frame which is directly sent by the wireless communication device without detecting whether a channel is occupied by other devices.
2. The method of claim 1,
the transmission time length of each of the at least two data blocks is the same; or,
the transmission time lengths of the data blocks except the last data block in the at least two data blocks are the same.
3. The method of claim 1,
the first preset time is not less than the conversion time of the receiving terminal from the receiving state to the sending state.
4. A method according to any of claims 1-3, wherein the data signal further comprises at least one of the following information:
the reference signal used for synchronization, the reference signal used for Reference Signal Received Power (RSRP) measurement, the reference signal used for Channel State Information (CSI) measurement, the reference signal used for interference measurement, the reference signal used for position measurement, resource allocation information corresponding to the at least two data blocks and Modulation Coding Scheme (MCS) information corresponding to the at least two data blocks.
5. The method of claim 4, wherein the short control signal further comprises control information, the control information comprising at least one of:
timing information, frequency offset information, RSRP measurement results, Reference Signal Received Quality (RSRQ) measurement results, Received Signal Strength Indication (RSSI) measurement results, CSI measurement results, interference measurement results and terminal position information.
6. The method of claim 5, wherein the receiving terminal sends a short control signal on the first carrier, comprising:
the receiving terminal sends the control information and the response information of the at least two data blocks on the first carrier wave through frequency division multiplexing or code division multiplexing;
or,
and the receiving terminal sends the control information and the response information of the at least two data blocks on the first carrier wave through time division multiplexing.
7. A method of data transmission, comprising:
a sending terminal acquires data to be sent, and divides the data to be sent into at least two data blocks, wherein the transmission time length of the last data block in the at least two data blocks is not more than the transmission time lengths of other data blocks;
the sending terminal sends a data signal to a receiving terminal on a first carrier, wherein the data signal comprises a demodulation reference signal and the at least two data blocks, so that the receiving terminal demodulates and decodes the previous data block when receiving the next data block;
and after a second preset time, the sending terminal receives a short control signal, the short control signal comprises response information of the at least two data blocks, the second preset time is an interval time from an end time of sending the data signal to a start time of receiving the short control signal, and the short control signal refers to a management and control frame which is directly sent by the wireless communication equipment without detecting whether a channel is occupied by other equipment.
8. The method of claim 7,
the transmission time length of each of the at least two data blocks is the same; or,
the transmission time lengths of the data blocks except the last data block in the at least two data blocks are the same.
9. The method of claim 7,
the second preset time is not less than a first preset time, and the first preset time is the interval time from the end time of receiving the data signal to the start time of sending the short control signal by the receiving terminal.
10. The method according to any of claims 7 to 9, wherein the data signal further comprises at least one of the following information:
the reference signal used for synchronization, the reference signal used for Reference Signal Received Power (RSRP) measurement, the reference signal used for Channel State Information (CSI) measurement, the reference signal used for interference measurement, the reference signal used for position measurement, resource allocation information corresponding to the at least two data blocks and Modulation Coding Scheme (MCS) information corresponding to the at least two data blocks.
11. The method of claim 10, wherein the short control signal further comprises control information, the control information comprising at least one of:
timing information, frequency offset information, RSRP measurement results, Reference Signal Received Quality (RSRQ) measurement results, Received Signal Strength Indication (RSSI) measurement results, CSI measurement results, interference measurement results and terminal position information.
12. A terminal, comprising:
a receiving module, configured to receive a data signal on a first carrier, where the data signal includes a demodulation reference signal and at least two data blocks, and a transmission time length of a last data block of the at least two data blocks is not greater than transmission time lengths of other data blocks;
the processing module is used for demodulating and decoding the at least two data blocks according to the demodulation reference signal, and the demodulation and decoding processing mode comprises that when the next data block is received, the previous data block is demodulated and decoded;
a sending module, configured to send a short control signal on the first carrier after a first preset time, where the short control signal includes response information of the at least two data blocks, the first preset time is an interval time from an end time of receiving the data signal to a start time of sending the short control signal, and the short control signal refers to a management and control frame that is directly sent by a wireless communication device without detecting whether a channel is occupied by other devices.
13. The terminal of claim 12,
the transmission time length of each of the at least two data blocks is the same; or,
the transmission time lengths of the data blocks except the last data block in the at least two data blocks are the same.
14. The terminal of claim 12,
the first preset time is not less than the transition time of the terminal from the receiving state to the sending state.
15. A terminal according to any of claims 12 to 14,
the data signal further comprises at least one of the following information:
the reference signal used for synchronization, the reference signal used for Reference Signal Received Power (RSRP) measurement, the reference signal used for Channel State Information (CSI) measurement, the reference signal used for interference measurement, the reference signal used for position measurement, resource allocation information corresponding to the at least two data blocks and Modulation Coding Scheme (MCS) information corresponding to the at least two data blocks.
16. The terminal according to claim 15, wherein,
the short control signal further comprises control information, the control information comprising at least one of:
timing information, frequency offset information, RSRP measurement results, Reference Signal Received Quality (RSRQ) measurement results, Received Signal Strength Indication (RSSI) measurement results, CSI measurement results, interference measurement results and terminal position information.
17. The terminal of claim 16,
the sending module is specifically configured to send the control information and the response information of the at least two data blocks on the first carrier by frequency division multiplexing or code division multiplexing;
or,
and transmitting the control information and the response information of the at least two data blocks on the first carrier by time division multiplexing.
18. A terminal, comprising:
the processing module is used for acquiring data to be transmitted and dividing the data to be transmitted into at least two data blocks, wherein the transmission time length of the last data block in the at least two data blocks is not more than the transmission time lengths of other data blocks;
a sending module, configured to send a data signal to a receiving terminal on a first carrier, where the data signal includes a demodulation reference signal and the at least two data blocks, so that when the receiving terminal receives a next data block, the receiving terminal demodulates and decodes a previous data block;
and the receiving module is used for receiving a short control signal after a second preset time, wherein the short control signal comprises response information of the at least two data blocks, the second preset time is an interval time from the end time of sending the data signal to the start time of receiving the short control signal by the sending terminal, and the short control signal refers to a management and control frame which is directly sent by the wireless communication equipment without detecting whether a channel is occupied by other equipment.
19. The terminal of claim 18, wherein the transmission time length of each of the at least two data blocks is the same; or,
the transmission time lengths of the data blocks except the last data block in the at least two data blocks are the same.
20. The terminal of claim 18,
the second preset time is not less than a first preset time, and the first preset time is the interval time from the end time of receiving the data signal to the start time of sending the short control signal by the receiving terminal.
21. A terminal according to any of claims 18 to 20,
the data signal further comprises at least one of the following information:
the reference signal used for synchronization, the reference signal used for Reference Signal Received Power (RSRP) measurement, the reference signal used for Channel State Information (CSI) measurement, the reference signal used for interference measurement, the reference signal used for position measurement, resource allocation information corresponding to the at least two data blocks and Modulation Coding Scheme (MCS) information corresponding to the at least two data blocks.
22. The terminal of claim 21, wherein the short control signal further comprises control information, and wherein the control information comprises at least one of the following information:
timing information, frequency offset information, RSRP measurement results, Reference Signal Received Quality (RSRQ) measurement results, Received Signal Strength Indication (RSSI) measurement results, CSI measurement results, interference measurement results and terminal position information.
23. A data transmission system, comprising: a transmitting terminal and a receiving terminal;
the sending terminal is the terminal according to any one of claims 18 to 22, and the receiving terminal is the terminal according to any one of claims 12 to 17.
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| PCT/CN2015/080548 WO2016192032A1 (en) | 2015-06-02 | 2015-06-02 | Data transmission method, system and terminal |
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| CN106797280B true CN106797280B (en) | 2020-04-14 |
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| CN111492695B (en) * | 2018-02-01 | 2023-07-25 | Oppo广东移动通信有限公司 | User equipment and wireless communication method thereof |
| CN110445587B (en) | 2018-05-04 | 2022-01-14 | 华为技术有限公司 | Information transmission method and information transmission device |
| CN111130721B (en) | 2018-10-31 | 2022-06-14 | 华为技术有限公司 | Data transmission method and device |
| US20230231637A1 (en) * | 2020-06-30 | 2023-07-20 | Qualcomm Incorporated | Channel state information reports and channel state information interference measurement reports associated with joint sensing and communication services |
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| CN101783700A (en) * | 2009-01-21 | 2010-07-21 | 大唐移动通信设备有限公司 | Indication method for upstream data transmission and method and device for transmitting upstream data |
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