CN111817828B - Data processing method and device - Google Patents
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- CN111817828B CN111817828B CN202010662182.4A CN202010662182A CN111817828B CN 111817828 B CN111817828 B CN 111817828B CN 202010662182 A CN202010662182 A CN 202010662182A CN 111817828 B CN111817828 B CN 111817828B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a data processing method and a data processing device, wherein after data sent by a sending node is received, a target subframe of the receiving node and a node identifier corresponding to the target subframe are determined, feedback data carrying the response data corresponding to the sending node are obtained based on a preset rule that overlapping data between the target subframe and subframes adjacent to the target subframe are blank data and the response data corresponding to the sending node, and the feedback data are sent through the target subframe at a frequency domain position corresponding to the receiving node. If one receiving node is far away from the sending node, so that the feedback data sent by the subframe used by the receiving node exceeds the receiving time of the sending node, the feedback data sent by the target subframe of the receiving node is overlapped with the feedback data sent by the subframe adjacent to the receiving node, but the overlapped data of the subframes is indicated to be blank data by the preset rule, so that the crosstalk generated by the response data of a plurality of receiving nodes can be avoided, and the successful decoding probability of the sending node on the response data is improved.
Description
Technical Field
The invention belongs to the technical field of wireless ad hoc networks, and particularly relates to a data processing method and device.
Background
The wireless ad hoc network is a temporary multi-hop ad hoc system consisting of a plurality of movable nodes, wherein part of the movable nodes are used as sending nodes and part of the movable nodes are used as receiving nodes in the actual working process, the receiving nodes receive data sent by the sending nodes, and then the receiving nodes send response data to the sending nodes to indicate whether the data are correctly received or not.
In order to save resources in the wireless ad hoc network, multiple receiving nodes can transmit response data in a multiplexing time slot manner, for example, a multiplexing time slot manner is adopted to transmit Hybrid Automatic Repeat reQuest (HARQ) feedback information to a transmitting node, and the HARQ feedback information is used as response data to indicate whether the data is correctly received, so that the transmitting node can receive HARQ feedback information of multiple receiving nodes at the same time.
However, the times of arrival of the response data transmitted by the plurality of receiving nodes at the transmitting node are asynchronous, so that crosstalk is easily generated between the response data of the plurality of receiving nodes, thereby causing the transmitting node to fail in decoding the response data.
Disclosure of Invention
In view of this, an object of the present invention is to provide a data processing method and apparatus, which are used to avoid crosstalk between response data of multiple receiving nodes, so as to improve the successful decoding probability of the response data by a sending node.
In one aspect, the present invention provides a data processing method, including:
receiving data sent by a sending node;
determining a target subframe used by a receiving node for feeding back response data to the sending node and a node identifier corresponding to the target subframe, wherein the node identifier is used for indicating the sending node corresponding to the response data carried in the target subframe;
obtaining feedback data carrying response data corresponding to the sending node based on a preset rule that overlapping data between the target subframe and a subframe adjacent to the target subframe are blank data and the response data corresponding to the sending node;
and sending the feedback data through the target subframe at the frequency domain position corresponding to the receiving node.
Optionally, the obtaining feedback data carrying the response data corresponding to the sending node based on a preset rule that the target subframe and the overlapping data between the subframes adjacent to the target subframe are blank data and the response data corresponding to the sending node includes:
calculating round-trip time between each sending node and each receiving node, and acquiring maximum round-trip time and minimum round-trip time from each round-trip time, wherein the maximum round-trip time is the round-trip time with the maximum value in each round-trip time, and the minimum round-trip time is the round-trip time with the minimum value in each round-trip time;
obtaining a maximum delay spread based on the maximum round-trip time and the minimum round-trip time;
and obtaining the feedback data based on the response data corresponding to the sending node, wherein each component in the feedback data sequentially comprises a cyclic prefix, the response data corresponding to the sending node and a protection time, the protection time is greater than or equal to the maximum round-trip time, and the length of the cyclic prefix is greater than or equal to the sum of the maximum delay spread and the maximum round-trip time, so that the feedback data meets a preset rule that the overlapped data between the target subframe and the subframe adjacent to the target subframe is blank data.
Optionally, the method further includes:
acquiring a decoding result of data transmitted by a transmitting node;
based on the decoding result, acquiring a U value and cyclic shift corresponding to a sending node;
and obtaining response data corresponding to the sending node based on the U value and the cyclic shift corresponding to the sending node.
Optionally, the obtaining, based on the decoding result, a U value and a cyclic shift corresponding to the sending node includes:
acquiring cyclic shift intervals according to the maximum single-hop distance between each sending node and each receiving node;
determining the number of U values based on the cyclic shift interval, the number of ZC sequence points used for representing the response data and the total number of the sending nodes;
and acquiring the U value and the cyclic shift corresponding to the sending node from a preset decoding result and U value cyclic shift relation based on the decoding result and the number of the U values.
Optionally, the obtaining response data corresponding to the sending node based on the U value and the cyclic shift corresponding to the sending node includes:
and obtaining a ZC sequence corresponding to the transmitting node based on the U value and the cyclic shift corresponding to the transmitting node, wherein the ZC sequence is used as the response data and is used for indicating the decoding result of the data transmitted by the transmitting node.
Optionally, the obtaining the cyclic shift interval according to the maximum single-hop distance between each sending node and each receiving node includes: acquiring the cyclic shift interval according to a relation D < = ((Ncs/Nzc) × Tseq-ds) × c/2, wherein Tseq is the sequence length of a ZC sequence, nzc is the number of ZC sequence points, D is the maximum single-hop distance, ncs is the cyclic shift interval, c is the speed of light, and ds is the maximum delay spread;
the determining the number of U values based on the cyclic shift interval, the number of ZC sequences used for characterizing the response data and the total number of the transmitting nodes comprises: and determining the number of U values according to the formula ceil (2K/(Nzc/Ncs)), wherein ceil represents rounding up, and K is the total number of the sending nodes.
In another aspect, the present invention provides a data processing apparatus, comprising:
a receiving unit, configured to receive data sent by a sending node;
a determining unit, configured to determine a target subframe used by a receiving node to feed back response data to the sending node and a node identifier corresponding to the target subframe, where the node identifier is used to indicate the sending node corresponding to the response data carried in the target subframe;
a data generating unit, configured to obtain feedback data carrying response data corresponding to the sending node based on a preset rule that overlapping data between the target subframe and a subframe adjacent to the target subframe is blank data and the response data corresponding to the sending node;
and the sending unit is used for sending the feedback data through the target subframe at the frequency domain position corresponding to the receiving node.
Optionally, the data generating unit includes:
the calculating subunit is used for calculating round-trip time between each sending node and each receiving node, and acquiring maximum round-trip time and minimum round-trip time from each round-trip time, wherein the maximum round-trip time is the round-trip time with the maximum value in each round-trip time, and the minimum round-trip time is the round-trip time with the minimum value in each round-trip time;
an obtaining subunit, configured to obtain a maximum delay spread based on the maximum round-trip time and the minimum round-trip time;
and the generating subunit is configured to obtain the feedback data based on the response data corresponding to the sending node, where each component in the feedback data sequentially includes a cyclic prefix, the response data corresponding to the sending node, and a protection time, the protection time is greater than or equal to the maximum round-trip time, and the length of the cyclic prefix is greater than or equal to the sum of the maximum delay spread and the maximum round-trip time, so that the feedback data meets a preset rule that overlapping data between the target subframe and a subframe adjacent to the target subframe is blank data.
In yet another aspect, the present invention provides a receiving node, including: a processor and a communication module;
the communication module is used for receiving data sent by the sending node;
the processor is configured to determine a target subframe used by a receiving node to feed back response data to the sending node and a node identifier corresponding to the target subframe, where the node identifier is used to indicate the sending node corresponding to the response data carried in the target subframe; obtaining feedback data carrying response data corresponding to the sending node based on a preset rule that overlapping data between the target subframe and a subframe adjacent to the target subframe are blank data and the response data corresponding to the sending node;
the communication module is further configured to send the feedback data through the target subframe at the frequency domain position corresponding to the receiving node.
In still another aspect, the present invention provides a storage medium having computer program code stored therein, the computer program code implementing the above data processing method when executed.
According to the technical scheme, after data sent by a sending node is received, a target subframe used for feeding back response data to the sending node in the receiving node and a node identifier corresponding to the target subframe are determined, the node identifier is used for indicating the sending node corresponding to the response data carried in the target subframe, the feedback data carrying the response data corresponding to the sending node is obtained based on a preset rule that overlapped data between the target subframe and subframes adjacent to the target subframe are blank data and the response data corresponding to the sending node, and the feedback data are sent through the target subframe at a frequency domain position corresponding to the receiving node. In the process of receiving the feedback data by the sending node, if a receiving node is far away from the sending node, so that the feedback data sent by the subframe used by the receiving node exceeds the receiving time of the sending node, the feedback data sent by the target subframe of the receiving node is overlapped with the feedback data sent by the subframe adjacent to the receiving node, but the overlapped data of the subframe is indicated to be blank data by the preset rule, the part of the feedback data exceeding the receiving time of the sending node is blank data, and interference to the feedback data of other subframes is avoided, so that the feedback data obtained based on the preset rule can avoid crosstalk among the response data of a plurality of receiving nodes, and the decoding success probability of the response data by the sending node is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a data processing method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of feedback data provided by an embodiment of the present invention;
FIG. 3 is a flow chart of another data processing method provided by an embodiment of the invention;
FIG. 4 is a diagram illustrating a receiving node and a frequency domain location according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a feedback window provided by an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a data processing apparatus according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another data processing apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
Referring to fig. 1, a flowchart of a data processing method according to an embodiment of the present invention is shown, where the method includes the following steps:
101: and receiving the data sent by the sending node.
102: and determining a target subframe used by the receiving node for feeding back response data to the sending node and a node identifier corresponding to the target subframe, wherein the node identifier is used for indicating the sending node corresponding to the response data carried in the target subframe.
After receiving the data sent by the sending node, it is necessary to feed back the data receiving condition of the receiving node to the sending node, for example, to indicate the data receiving condition of the receiving node with the response data. Wherein the data receiving condition comprises: the receiving node receives data and decodes correctly, the receiving node receives data but decodes incorrectly, and the receiving node does not receive data, for each data receiving situation, corresponding response data can be adopted for feedback, for example, ACK indicates that the receiving node receives data and decodes correctly, NACK indicates that the receiving node receives data but decodes incorrectly, DTX indicates that the receiving node does not receive data, and the data receiving situation is indicated by the three.
The receiving node can load the response data into the subframe in the process of sending the response data, the response data is sent through the subframe, the target subframe is a subframe used by the receiving node in the process of sending the response data, the corresponding sending node can also send the response data through the subframe in the process of sending the data, and the node identification can be represented by the identification of the subframe used by the sending node in the process of sending the data through the subframe.
For a target subframe of a receiving node, the data receiving condition of the receiving node receiving data sent by at least one sending node can be fed back in one target subframe, so that a node identifier corresponding to the target subframe needs to be determined before response data is sent, so as to indicate that the data receiving condition of the data sent by which sending nodes is fed back in the subframe.
In this embodiment, the node identifier corresponding to the target subframe may be preset, and one way of setting the node identifier corresponding to the target subframe is as follows:
the index of the target subframe is n, the feedback window of the subframe n is P, which means that P subframes before the current subframe n are fed back in the current subframe n, the P subframes before the current subframe n are subframes with the index of n-km, and km is a value in the feedback window P. For example, P = {5,6,7,8}, current subframe n may feed back response data to data sent for subframe n-5, subframe n-6, subframe n-7, and subframe n-8.
Certainly, the node identifier corresponding to the target subframe may also be set in other manners in this embodiment, and this embodiment is not described one by one.
103: the feedback data carrying the response data corresponding to the sending node is obtained based on a preset rule that the target subframe and the overlapping data between the subframes adjacent to the target subframe are blank data and the response data corresponding to the sending node, and the overlapping parts of the plurality of feedback data received by the sending node can be blank data through the feedback data designed by the preset rule, so that the mutual influence among the plurality of feedback data is prevented. In this embodiment, one possible way to obtain the feedback data includes the following steps:
1) And calculating the round-trip time between each sending node and each receiving node, and acquiring the maximum round-trip time and the minimum round-trip time from each round-trip time, wherein the maximum round-trip time is the round-trip time with the maximum value in each round-trip time, and the minimum round-trip time is the round-trip time with the minimum value in each round-trip time. The round trip time between the sending node and the receiving node is calculated as: RTT =2*d/c, RTT representing round trip time, d being the distance between the transmitting node and the receiving node, and c being the speed of light, and after calculating the round trip time between the transmitting node and the receiving node, the maximum round trip time and the minimum round trip time are selected from these round trip times.
2) And obtaining the maximum delay spread based on the maximum round-trip time and the minimum round-trip time. The maximum delay spread is a delay difference between the maximum round-trip time and the minimum round-trip time, and the maximum delay spread is obtained by calculating a difference between the maximum round-trip time and the minimum round-trip time.
3) And obtaining feedback data based on the response data corresponding to the sending node, wherein the feedback data sequentially comprises a cyclic prefix, the response data corresponding to the sending node and protection time, the protection time is greater than or equal to the maximum round trip time, and the length of the cyclic prefix is greater than or equal to the sum of the maximum delay spread and the maximum round trip time.
In this embodiment, the transmission delay between nodes corresponding to the maximum round-trip Time should be within the range of Guard Time (GT, guard Time), so as to prevent the response data carried in one subframe from interfering with other subframes, that is, GT > = the maximum round-trip Time; the transmission delay between nodes corresponding to the maximum round trip time plus the multipath delay spread should be within a Cyclic Prefix (CP), so as to prevent the transmission delay and the inter-symbol interference caused by the multipath delay, that is, the CP length > = the maximum round trip time + the maximum delay spread, and thus the guard time and the Cyclic Prefix may be added to the feedback data to prevent mutual interference between response data carried in different subframes.
As shown in fig. 2, which illustrates a manner of feedback data provided by this embodiment, in addition to illustrating a form of the feedback data, a plurality of feedback data arrive at the sending node, and as can be seen from the feedback data shown in fig. 2, when distances between the receiving node and the sending node are different, a time (referred to as a receiving time for short) when a certain subframe arrives at the sending node occupies a time for receiving response data in a next round of the sending node, but since the time occupied for receiving response data in the next round of the subframe is a guard time, and data in the guard time is blank data (i.e., no data), even if the time occupied for receiving response data in the next round is the next round, the data received in the next round will not be interfered.
In addition to the above feasible manners of obtaining the feedback data, the present embodiment may also obtain the feedback data in other feasible manners, such as obtaining a protection time and a length of a cyclic prefix through multiple tests, generating the feedback data through the protection time and the cyclic prefix obtained in advance, or forming the feedback data by the response data and a blank data with a certain length, where the length of the blank data may be determined according to actual applications, such as according to a distance between nodes in a wireless ad hoc network to which the blank data is applied.
104: and sending feedback data through the target subframe at the frequency domain position corresponding to the receiving node.
The frequency domain position is a frequency domain adopted when the receiving node is used to send the response data, and because there are multiple receiving nodes in one communication network, and the multiple receiving nodes need to send the response data at their respective corresponding frequency domain positions during sending the response data, in this embodiment, each receiving node may be allocated its respective corresponding frequency domain position to send the response data at the frequency domain indicated by the frequency domain position. The frequency domain location corresponding to each receiving node may be assigned by a controller in the wireless ad hoc network or negotiated between nodes in the wireless ad hoc network.
The correspondence relationship between the receiving node and the frequency domain position may be, but is not limited to: one receiving node corresponds to one frequency domain position to realize distinguishing in a frequency division mode, or a plurality of receiving nodes correspond to one frequency domain position, and under the condition that the plurality of receiving nodes correspond to one frequency domain position, the receiving nodes can be distinguished in a U value and cyclic shift mode to distinguish in a code division mode on the basis of the frequency division mode.
In the wireless ad hoc network, part of nodes do not perform service processing, the nodes which do not perform service processing do not transmit data to the outside but receive data transmitted by other nodes and need to feed back response data, and a frequency domain position is allocated to the type of nodes to feed back the response data, so that resource waste is caused.
According to the technical scheme, after data sent by a sending node is received, a target subframe used for feeding back response data to the sending node in the receiving node and a node identifier corresponding to the target subframe are determined, the node identifier is used for indicating the sending node corresponding to the response data carried in the target subframe, the feedback data carrying the response data corresponding to the sending node is obtained based on a preset rule that overlapped data between the target subframe and subframes adjacent to the target subframe are blank data and the response data corresponding to the sending node, and the feedback data are sent through the target subframe at a frequency domain position corresponding to the receiving node. In the process of receiving the feedback data by the sending node, if a receiving node is far away from the sending node, so that the feedback data sent by the subframe used by the receiving node exceeds the receiving time of the sending node, the feedback data sent by the target subframe of the receiving node is overlapped with the feedback data sent by the subframe adjacent to the receiving node, but the overlapped data of the subframe is indicated to be blank data by the preset rule, the part of the feedback data exceeding the receiving time of the sending node is blank data, and interference to the feedback data of other subframes is avoided, so that the feedback data obtained based on the preset rule can avoid crosstalk among the response data of a plurality of receiving nodes, and the decoding success probability of the response data by the sending node is improved.
The points to be explained here are: if one receiving node corresponds to one frequency domain position, although each receiving node can send feedback data at the corresponding frequency domain position, feedback data of other receiving nodes are not affected in the process of sending the feedback data at the frequency domain position, but the time for the feedback data to reach the sending node is different due to different distances between different receiving nodes and the sending node, so that even if a one-to-one mode is adopted (one receiving node corresponds to one frequency domain position), the feedback data also needs to be designed based on a preset rule that the overlapped data is blank data, so that the interference of the feedback data at the sending node is avoided.
In this embodiment, the response data is used to indicate the receiving situation of the data sent by the sending node by the receiving node, and fig. 3 shows a manner of obtaining the response data, which may include the following steps:
301: and receiving the data sent by the sending node.
302: and determining a target subframe used by the receiving node for feeding back response data to the sending node and a node identifier corresponding to the target subframe, wherein the node identifier is used for indicating the sending node corresponding to the response data carried in the target subframe.
303: and acquiring a decoding result of the data transmitted by the transmitting node. The decoding result is used for indicating whether the receiving node correctly decodes the data when receiving the data and whether the data is received, so that the data receiving condition of the receiving node for the data sent by the sending node is explained through the decoding result, and then response data is obtained according to the decoding result.
304: and acquiring the U value and the cyclic shift corresponding to the sending node based on the decoding result.
305: and obtaining response data corresponding to the sending node based on the U value and the cyclic shift corresponding to the sending node.
In this embodiment, the U value and the cyclic shift correspond to a decoding result of data sent by the sending node, so that the decoding result is represented by the U value and the cyclic shift, and thus in this embodiment, a corresponding relationship between the U value cyclic shift and the decoding result may be preset, so that when the decoding result of data sent by the sending node is obtained, a matched U value and a matched cyclic shift may be found according to the corresponding relationship, and the matched U value and the matched cyclic shift are used as the U value and the matched cyclic shift corresponding to the sending node.
Since the decoding result is used to indicate whether the receiving node correctly decodes the data when receiving the data and whether the data is received, the decoding result also includes three cases: the receiving node receives data and decodes correctly, the receiving node receives data but decodes incorrectly, and the receiving node does not receive data, for these three decoding results, it can map to at least one of different U values and cyclic shifts, so in this embodiment, one way to obtain the U value and cyclic shift corresponding to the sending node is as follows:
acquiring cyclic shift intervals according to the maximum single-hop distance between each sending node and each receiving node; determining the number of U values based on the cyclic shift interval, the number of ZC sequence points used for representing response data and the total number of transmitting nodes; and acquiring the U value and the cyclic shift corresponding to the sending node from the preset decoding result and U value cyclic shift relation based on the decoding result and the number of the U values. The maximum single-hop distance is the maximum value in the distances from each transmitting node to each receiving node, the cyclic shift interval is used for indicating the relationship between the ZC sequences corresponding to different transmitting nodes, for example, after a ZC sequence is constructed through a U value and cyclic shift, the ZC sequence can be used as an initial sequence, and then the initial sequence is cyclically shifted through the cyclic shift interval to obtain the ZC sequences corresponding to other transmitting nodes.
The ZC sequence is an expression of response data, and a manner of obtaining the ZC sequence by instructing a transmission node to transmit a decoding result of data through the ZC sequence using the ZC sequence as the response data is: and obtaining the ZC sequence corresponding to the transmitting node based on the U value and the cyclic shift corresponding to the transmitting node, for example, constructing the ZC sequence based on the U value and the cyclic shift corresponding to the transmitting node, and obtaining the corresponding U value and the cyclic shift by solving the ZC sequence, which is not explained in the embodiment of the construction process.
The cyclic shift interval can be obtained according to a relation D < = ((Ncs/Nzc) × Tseq-ds) × c/2, where Tseq is the sequence length of a ZC sequence, nzc is the number of ZC sequence points, D is the maximum single hop distance, ncs is the cyclic shift interval, c is the speed of light, and ds is the maximum delay spread; the number of U values may be determined according to the formula ceil (2K/(Nzc/Ncs)), where ceil represents rounding up, and K is the total number of transmitting nodes.
The points to be explained here are: if response data is fed back to multiple sending nodes in one subframe at the same time, in order to distinguish different sending nodes, this embodiment may distinguish through U values, that is, different sending nodes are mapped with different U values, for example, 3 sending nodes send data to a receiving node in 3 subframes respectively, and a receiving node feeds back response data to 3 subframes in one subframe, different U values may be mapped for 3 subframes, for example, U1, U2, and U3 are mapped respectively, so as to distinguish 3 subframes through U1, U2, and U3. Or the 3 subframes map the same U value but the cyclic shifts of the 3 subframes are different, such as mapping to U1_ CS1, U1_ CS2, and U1_ CS3, and the subframes can be distinguished by different cyclic shifts although the U values are the same, and this way of mapping to the same U value but the cyclic shifts are different can reduce the complexity of the receiving node and the transmitting node.
306: and obtaining feedback data carrying the response data corresponding to the sending node based on a preset rule that the target subframe and the overlapping data between the subframes adjacent to the target subframe are blank data and the response data corresponding to the sending node.
If the target subframe carries response data corresponding to the plurality of transmitting nodes, acquiring ZC sequences corresponding to the target subframe respectively according to the U values and the cyclic shift of the plurality of transmitting nodes, and superposing the ZC sequences to be used as the response data corresponding to the plurality of transmitting nodes. Of course, in this embodiment, the U value and the cyclic shift corresponding to each transmitting node may also be obtained, and the U value and the cyclic shift corresponding to the transmitting node may be directly used as the response data.
307: and sending feedback data through the target subframe at the frequency domain position corresponding to the receiving node.
In this embodiment, in the above steps 301 to 307, the same steps as those in the steps 101 to 104 are not described.
According to the technical scheme, the data receiving condition of the sending data of the sending node at the receiving node side can be represented through the U value and the cyclic shift corresponding to the sending node, whether the data are correctly received or not can be represented through the U value and the cyclic shift, the feedback accuracy is improved while the interference problem is solved, different receiving conditions can be reflected, and compared with LTE TTI bundling (subframe bundling in LTE), the two conditions of ACK and NACK can be accurately known through the U value and the cyclic shift, the DTX state can be distinguished, and compared with the condition that the LTE cannot distinguish NACK from DTX, more receiving conditions can be reflected.
The following description takes 8 receiving nodes to feed back response data as an example, where frequency domain positions corresponding to the 8 receiving nodes are shown in fig. 4, each receiving node corresponds to one frequency domain position, the 8 receiving nodes are marked as N0 to N7, a wireless frame adopted by a wireless ad hoc network where the 8 receiving nodes are located is 20ms, the 8 nodes feed back on subframes 1 and 11 ( subframes 1 and 11 are target subframes), a design of a feedback window is shown in fig. 5, it can be known through the feedback window shown in fig. 5 which subframes (a sending node sends data in a subframe) send data in which subframes are fed back in subframes 1 and 11, and table 1 also illustrates which subframes send data.
In the feedback process in the subframes 1 and 11, the number of U values used is determined through the above steps 303 to 305, for example, it is determined that ACK/NACK is mapped to one U value, for example, ACK is mapped to U1, P subframes corresponding to a feedback window are mapped to P cyclic shift sequences of U1, and a relationship between the cyclic shift sequences satisfies a relationship indicated by a cyclic shift interval; NACK maps to U2 and P cyclic shifted sequences of U2 map to P subframes of the feedback window. After determining the node identifier and the decoding result, searching for a corresponding U value and cyclic shift from the relationship table shown in table 2 to obtain a corresponding ZC sequence, superimposing the ZC sequence and carrying the ZC sequence in feedback data, and transmitting the ZC sequence using a corresponding subframe, or superimposing the U value and the cyclic shift and carrying the ZC sequence in feedback data, and transmitting the ZC sequence using a corresponding subframe, so as to feed back data reception conditions of data transmitted by a plurality of subframes in one subframe, and can distinguish different reception conditions by the U value and the cyclic shift, and avoid interference by using the design method of the feedback data of the embodiment.
TABLE 1 feedback Window
| |
1 | 0、2-10 | 11 | 12-19 |
| |
4,5,6,7,8,9,11,12,13 | - | 4,5,6,7,8,9,12,13 | - |
TABLE 2 relationship table of U values and cyclic shifts
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
Corresponding to the foregoing method embodiment, an embodiment of the present invention provides a data processing apparatus, which has a structure as shown in fig. 6 and may include: a receiving unit 10, a determining unit 20, a data generating unit 30 and a transmitting unit 40.
A receiving unit 10, configured to receive data sent by a sending node.
A determining unit 20, configured to determine a target subframe used by the receiving node to feed back the response data to the sending node and a node identifier corresponding to the target subframe, where the node identifier is used to indicate the sending node corresponding to the response data carried in the target subframe. After receiving the data sent by the sending node, it is necessary to feed back the data receiving condition of the receiving node to the sending node, for example, to indicate the data receiving condition of the receiving node with the response data. Wherein the data receiving condition comprises: the receiving node receives data and decodes correctly, the receiving node receives data but decodes incorrectly, and the receiving node does not receive data, for each data receiving situation, corresponding response data can be adopted for feedback, for example, ACK indicates that the receiving node receives data and decodes correctly, NACK indicates that the receiving node receives data but decodes incorrectly, DTX indicates that the receiving node does not receive data, and the data receiving situation is indicated by the three.
The receiving node can load the response data into the subframe in the process of sending the response data, and the target subframe is a subframe used by the receiving node in the process of sending the response data when the response data is sent through the subframe. The data receiving condition of the receiving node receiving the data sent by at least one sending node may be fed back in one target subframe, so that the determining unit 20 needs to determine the node identifier corresponding to the target subframe to indicate which sending nodes send data to be fed back in the subframe.
In this embodiment, the node identifier corresponding to the target subframe may be preset, and one way of setting the node identifier corresponding to the target subframe is as follows:
the index of the target subframe is n, the feedback window of the subframe n is P, which means that P subframes before the current subframe n are fed back in the current subframe n, the P subframes before the current subframe n are subframes with the index of n-km, and km is a value in the feedback window P. For example, P = {5,6,7,8}, current subframe n may feed back response data to data sent for subframe n-5, subframe n-6, subframe n-7, and subframe n-8. Certainly, the node identifier corresponding to the target subframe may also be set in other manners in this embodiment, and this embodiment is not described one by one.
The data generating unit 30 is configured to obtain feedback data carrying the response data corresponding to the sending node based on a preset rule that the target subframe and the overlapping data between subframes adjacent to the target subframe are blank data and the response data corresponding to the sending node, and the overlapping portion of the multiple feedback data received by the sending node can be blank data through the feedback data designed by the preset rule, so that mutual influence between the multiple feedback data is prevented.
In this embodiment, an optional structure of the data generating unit is: the data generation unit includes: a calculation subunit, an obtaining subunit, and a generation subunit.
And the calculation subunit is used for calculating the round-trip time between each sending node and each receiving node and acquiring the maximum round-trip time and the minimum round-trip time from each round-trip time, wherein the maximum round-trip time is the round-trip time with the maximum value in each round-trip time, and the minimum round-trip time is the round-trip time with the minimum value in each round-trip time. The round trip time between the sending node and the receiving node is calculated as: RTT =2*d/c, RTT representing round trip time, d being the distance between the transmitting node and the receiving node, and c being the speed of light, and after calculating the round trip time between the transmitting node and the receiving node, the maximum round trip time and the minimum round trip time are selected from these round trip times.
An obtaining subunit, configured to obtain a maximum delay spread based on the maximum round trip time and the minimum round trip time. The maximum delay spread is a delay difference between the maximum round-trip time and the minimum round-trip time, and the maximum delay spread is obtained by calculating a difference between the maximum round-trip time and the minimum round-trip time.
And the generating subunit is used for obtaining feedback data based on the response data corresponding to the sending node, wherein each component in the feedback data sequentially comprises a cyclic prefix, the response data corresponding to the sending node and protection time, the protection time is greater than or equal to the maximum round-trip time, and the length of the cyclic prefix is greater than or equal to the sum of the maximum delay spread and the maximum round-trip time, so that the feedback data meets the preset rule that the overlapped data between the target subframe and the subframe adjacent to the target subframe is blank data.
In this embodiment, the transmission delay between nodes corresponding to the maximum round-trip time should be within the GT range, so as to prevent the response data carried in one subframe from interfering with other subframes, that is, GT > = the maximum round-trip time; the transmission delay between nodes corresponding to the maximum round-trip time plus the multipath delay spread should be within the CP range, so as to prevent the inter-symbol interference caused by the transmission delay and the multipath delay, that is, the CP length > = the maximum round-trip time + the maximum delay spread, and thus the guard time and the cyclic prefix may be added to the feedback data to prevent the mutual interference between the response data carried in different subframes.
And a sending unit 40, configured to send feedback data through the target subframe at the frequency domain position corresponding to the receiving node. The frequency domain position is a frequency domain adopted by the receiving node when the receiving node is used for sending the response data, so as to send the feedback data at the frequency domain position corresponding to the receiving node, and for the description of the frequency domain position, refer to the above method embodiment.
According to the technical scheme, after data sent by a sending node is received, a target subframe used for feeding back response data to the sending node in the receiving node and a node identifier corresponding to the target subframe are determined, the node identifier is used for indicating the sending node corresponding to the response data carried in the target subframe, the feedback data carrying the response data corresponding to the sending node is obtained based on a preset rule that overlapped data between the target subframe and subframes adjacent to the target subframe are blank data and the response data corresponding to the sending node, and the feedback data are sent through the target subframe at a frequency domain position corresponding to the receiving node. In the process of receiving the feedback data by the sending node, if a receiving node is far away from the sending node, so that the feedback data sent by the subframe used by the receiving node exceeds the receiving time of the sending node, the feedback data sent by the target subframe of the receiving node is overlapped with the feedback data sent by the subframe adjacent to the receiving node, but the overlapped data of the subframe is indicated to be blank data by the preset rule, the part of the feedback data exceeding the receiving time of the sending node is blank data, and interference to the feedback data of other subframes is avoided, so that the feedback data obtained based on the preset rule can avoid crosstalk among the response data of a plurality of receiving nodes, and the decoding success probability of the response data by the sending node is improved.
The points to be explained here are: if one receiving node corresponds to one frequency domain position, although each receiving node can send feedback data at the corresponding frequency domain position, the feedback data of other receiving nodes is not affected in the process of sending the feedback data at the frequency domain position, the time for the feedback data to reach the sending node is different due to different distances between different receiving nodes and the sending node, and therefore even if a one-to-one mode is adopted (one receiving node corresponds to one frequency domain position), the feedback data needs to be designed based on a preset rule that the overlapped data is blank data, so that the interference of the feedback data at the sending node is avoided.
In this embodiment, the response data is used to indicate the receiving situation of the data sent by the sending node by the receiving node, the data processing apparatus shown in fig. 7 shows a manner of obtaining the response data, and the data processing apparatus shown in fig. 6 may further include: an acquisition unit 50 and a data acquisition unit 60.
An obtaining unit 50, configured to obtain a decoding result of data transmitted to the transmitting node, and obtain a U value and a cyclic shift corresponding to the transmitting node based on the decoding result.
One way for the obtaining unit 50 to obtain the U value and the cyclic shift corresponding to the sending node is as follows: acquiring cyclic shift intervals according to the maximum single-hop distance between each sending node and each receiving node; determining the number of U values based on the cyclic shift interval, the number of ZC sequence points used for representing response data and the total number of sending nodes; and acquiring the U value and the cyclic shift corresponding to the sending node from the preset decoding result and U value cyclic shift relation based on the decoding result and the number of the U values.
If the cyclic shift interval is obtained according to the relation D < = ((Ncs/Nzc). Tseq-ds). C/2, wherein Tseq is the sequence length of a ZC sequence, nzc is the number of ZC sequence points, D is the maximum single-hop distance, ncs is the cyclic shift interval, c is the speed of light, and ds is the maximum delay spread. And determining the number of U values according to the formula ceil (2K/(Nzc/Ncs)), wherein ceil represents rounding up, and K is the total number of the sending nodes.
And a data obtaining unit 60, configured to obtain response data corresponding to the sending node based on the U value and the cyclic shift corresponding to the sending node. For example, the data obtaining unit 60 obtains a ZC sequence corresponding to the transmission node based on the U value and the cyclic shift corresponding to the transmission node, and uses the ZC sequence as response data for instructing the transmission node to send a decoding result of the data.
For the description of the obtaining unit 50 and the data obtaining unit 60, please refer to the above method embodiments, which are not described herein again.
According to the technical scheme, the data receiving condition of the data sent by the sending node at the receiving node side can be represented through the U value and the cyclic shift corresponding to the sending node, whether the data are correctly received or not and whether the data are received or not can be represented through the U value and the cyclic shift, the feedback accuracy is improved while the interference problem is solved, different receiving conditions can be reflected, compared with LTE TTI bundling, the two conditions of ACK and NACK can be accurately known through the U value and the cyclic shift, in addition, the DTX state can be distinguished, compared with the condition that the LTE cannot distinguish NACK and DTX, more receiving conditions can be reflected.
An embodiment of the present invention further provides a receiving node, where the receiving node includes: a processor and a communication module.
And the communication module is used for receiving the data sent by the sending node. And the processor is used for determining a target subframe used by the receiving node for feeding back the response data to the sending node and a node identifier corresponding to the target subframe, wherein the node identifier is used for indicating the sending node corresponding to the response data carried in the target subframe. And obtaining feedback data carrying the response data corresponding to the sending node based on a preset rule that the target subframe and the overlapping data between the subframes adjacent to the target subframe are blank data and the response data corresponding to the sending node. And the communication module is also used for sending feedback data at the frequency domain position corresponding to the receiving node through the target subframe.
For the description of the working process of the processor and the communication module, please refer to the above method embodiment, which is not described herein again.
The embodiment of the invention also provides a storage medium, wherein the storage medium stores computer program codes, and the data processing method is realized when the computer program codes are executed.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, features of the embodiments may be combined with or replaced with each other, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method of data processing, the method comprising:
receiving data sent by a sending node;
determining a target subframe used by a receiving node for feeding back response data to the sending node and a node identifier corresponding to the target subframe, wherein the node identifier is used for indicating the sending node corresponding to the response data carried in the target subframe;
obtaining feedback data carrying response data corresponding to the sending node based on a preset rule that overlapping data between the target subframe and a subframe adjacent to the target subframe are blank data and the response data corresponding to the sending node; the feedback data obtained by the preset rule can avoid crosstalk among response data of a plurality of receiving nodes;
and sending the feedback data through the target subframe at a frequency domain position corresponding to the receiving node, wherein the frequency domain position is a respective corresponding frequency domain position which is allocated to each receiving node in advance, the corresponding relationship between the receiving node and the frequency domain position is that one receiving node corresponds to one frequency domain position, and/or a plurality of receiving nodes correspond to one frequency domain position.
2. The method according to claim 1, wherein the obtaining feedback data carrying the response data corresponding to the sending node based on a preset rule that the target subframe and the subframe adjacent to the target subframe are overlapped data as blank data and the response data corresponding to the sending node comprises:
calculating round-trip time between each sending node and each receiving node, and acquiring maximum round-trip time and minimum round-trip time from each round-trip time, wherein the maximum round-trip time is the round-trip time with the maximum value in each round-trip time, and the minimum round-trip time is the round-trip time with the minimum value in each round-trip time;
obtaining a maximum delay spread based on the maximum round-trip time and the minimum round-trip time;
and obtaining the feedback data based on the response data corresponding to the sending node, wherein each component in the feedback data sequentially comprises a cyclic prefix, the response data corresponding to the sending node and a protection time, the protection time is greater than or equal to the maximum round-trip time, and the length of the cyclic prefix is greater than or equal to the sum of the maximum delay spread and the maximum round-trip time, so that the feedback data meets a preset rule that the overlapped data between the target subframe and the subframe adjacent to the target subframe is blank data.
3. The method of claim 1, further comprising:
acquiring a decoding result of data transmitted by a transmitting node;
acquiring a U value and cyclic shift corresponding to a sending node based on the decoding result;
and obtaining response data corresponding to the sending node based on the U value and the cyclic shift corresponding to the sending node.
4. The method of claim 3, wherein the obtaining the U value and the cyclic shift corresponding to the sending node based on the decoding result comprises:
acquiring cyclic shift intervals according to the maximum single-hop distance between each sending node and each receiving node;
determining the number of U values based on the cyclic shift interval, the number of ZC sequence points used for representing the response data and the total number of the sending nodes;
and acquiring the U value and the cyclic shift corresponding to the sending node from a preset decoding result and U value cyclic shift relation based on the decoding result and the number of the U values.
5. The method of claim 4, wherein obtaining the response data corresponding to the sending node based on the U value and the cyclic shift corresponding to the sending node comprises:
and obtaining a ZC sequence corresponding to the transmitting node based on the U value and the cyclic shift corresponding to the transmitting node, wherein the ZC sequence is used as the response data and is used for indicating the decoding result of the data transmitted by the transmitting node.
6. The method of claim 4, wherein obtaining cyclic shift intervals according to a maximum single-hop distance between each transmitting node and each receiving node comprises: acquiring the cyclic shift interval according to a relation D < = ((Ncs/Nzc) × Tseq-ds) × c/2, wherein Tseq is the sequence length of a ZC sequence, nzc is the number of ZC sequence points, D is the maximum single-hop distance, ncs is the cyclic shift interval, c is the speed of light, and ds is the maximum delay spread;
the determining the number of U values based on the cyclic shift interval, the number of ZC sequences used for characterizing the response data and the total number of the transmitting nodes comprises: and determining the number of U values according to the formula ceil (2K/(Nzc/Ncs)), wherein ceil represents rounding up, and K is the total number of the sending nodes.
7. A data processing apparatus, characterized in that the apparatus comprises:
a receiving unit, configured to receive data sent by a sending node;
a determining unit, configured to determine a target subframe used by a receiving node to feed back response data to the sending node and a node identifier corresponding to the target subframe, where the node identifier is used to indicate the sending node corresponding to the response data carried in the target subframe;
a data generating unit, configured to obtain feedback data carrying response data corresponding to the sending node based on a preset rule that overlapping data between the target subframe and a subframe adjacent to the target subframe is blank data and the response data corresponding to the sending node; the feedback data obtained by the preset rule can avoid crosstalk among the response data of a plurality of receiving nodes;
a sending unit, configured to send the feedback data through the target subframe at a frequency domain position corresponding to the receiving node, where the frequency domain position is a respective corresponding frequency domain position allocated to each receiving node in advance, and a corresponding relationship between the receiving node and the frequency domain position is that one receiving node corresponds to one frequency domain position, and/or multiple receiving nodes correspond to one frequency domain position.
8. The apparatus of claim 7, wherein the data generation unit comprises:
the calculating subunit is used for calculating round-trip time between each sending node and each receiving node, and acquiring maximum round-trip time and minimum round-trip time from each round-trip time, wherein the maximum round-trip time is the round-trip time with the maximum value in each round-trip time, and the minimum round-trip time is the round-trip time with the minimum value in each round-trip time;
an obtaining subunit, configured to obtain a maximum delay spread based on the maximum round-trip time and the minimum round-trip time;
and the generating subunit is configured to obtain the feedback data based on the response data corresponding to the sending node, where each component in the feedback data sequentially includes a cyclic prefix, the response data corresponding to the sending node, and a protection time, the protection time is greater than or equal to the maximum round-trip time, and the length of the cyclic prefix is greater than or equal to the sum of the maximum delay spread and the maximum round-trip time, so that the feedback data meets a preset rule that overlapping data between the target subframe and a subframe adjacent to the target subframe is blank data.
9. A receiving node, characterized in that the receiving node comprises: a processor and a communication module;
the communication module is used for receiving data sent by the sending node;
the processor is configured to determine a target subframe used by a receiving node to feed back response data to the sending node and a node identifier corresponding to the target subframe, where the node identifier is used to indicate the sending node corresponding to the response data carried in the target subframe; obtaining feedback data carrying response data corresponding to the sending node based on a preset rule that overlapping data between the target subframe and a subframe adjacent to the target subframe are blank data and the response data corresponding to the sending node; the feedback data obtained by the preset rule can avoid crosstalk among response data of a plurality of receiving nodes;
the communication module is further configured to send the feedback data through the target subframe at a frequency domain position corresponding to the receiving node, where the frequency domain position is a respective corresponding frequency domain position allocated to each receiving node in advance, and a corresponding relationship between the receiving node and the frequency domain position is that one receiving node corresponds to one frequency domain position, and/or multiple receiving nodes correspond to one frequency domain position.
10. A storage medium, characterized in that the storage medium has stored therein computer program code, which when executed by a processor implements the data processing method of any of the preceding claims 1 to 6.
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