CN107566378B - Data frame, data sending method and device - Google Patents
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- CN107566378B CN107566378B CN201710813632.3A CN201710813632A CN107566378B CN 107566378 B CN107566378 B CN 107566378B CN 201710813632 A CN201710813632 A CN 201710813632A CN 107566378 B CN107566378 B CN 107566378B
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Abstract
The invention provides a data frame, a data sending method and a data sending device. A data frame, comprising: a set number of transmission time intervals, each transmission time interval at least comprising 2 reference signal channels for transmitting pilot signals; the 1 st transmission time interval in the transmission time intervals of the set number further comprises a control channel, a main synchronous signal channel, an auxiliary synchronous signal channel, a broadcast channel, a shared channel and a guard interval; each transmission time interval except the 1 st transmission time interval respectively comprises a control channel, a discovery signal channel, a shared channel and a guard interval; wherein the 2 nd time slot of the last 1 transmission time interval further comprises a set number of access signal channels. By adopting the data frame format provided by the invention to transmit data, more pilot signals are sent, the position for sending the pilot signals is more flexible, the communication node can accurately obtain the channel estimation value through the pilot signals, and the network mobility is improved.
Description
Technical Field
The invention relates to the technical field of broadband MESH network communication, in particular to a data frame and data sending method and device.
Background
A wireless MESH network (MESH network) is widely used because of the advantages of high bandwidth, high speed, and high spectral efficiency based on the cooperation and cooperation among a plurality of wireless access points distributed in a MESH, and is one of key technologies for solving the problem of the last kilometer of a wireless network.
The pilot signal in the broadband MESH network signal can be used as a reference signal for synchronous positioning, and the pilot signal is transmitted in the broadband MESH network, so that the switching success rate of different carrier frequencies can be effectively improved, and the broadband MESH network has higher mobility. And the nodes in the broadband MESH network obtain channel estimation values according to the received pilot signals. In the prior art, the pilot signal is single and fixed based on the wideband MESH network data frame format design, and the channel value can be considered to be basically unchanged. When the channel doppler frequency shift is large, the channel estimation value obtained by the communication node through the pilot signal of the data packet header is not accurate, which causes the performance of the broadband MESH network to be seriously degraded and the mobility of the broadband MESH network to be low.
Disclosure of Invention
Based on the defects and shortcomings of the prior art, the invention provides a data frame, a data sending method and a data sending device.
A data frame, comprising:
a set number of transmission time intervals, each transmission time interval at least comprising 2 reference signal channels for transmitting pilot signals;
the 1 st transmission time interval in the transmission time intervals of the set number further comprises a control channel, a main synchronous signal channel, an auxiliary synchronous signal channel, a broadcast channel, a shared channel and a guard interval;
each transmission time interval except the 1 st transmission time interval respectively comprises a control channel, a discovery signal channel, a shared channel and a guard interval; wherein the 2 nd slot of the last 1 transmission time interval also includes an access signal channel.
Preferably, the reference signal channel in the last 1 transmission time interval of the data frame occupies frequency resources in the 1 st symbol and the 4 th symbol of the last 1 transmission time interval;
the reference signal channels of the transmission time intervals except the last 1 transmission time interval of the data frame respectively occupy frequency resources in the 1 st, 4 th, 8 th and 11 th symbols of the transmission time intervals except the last 1 transmission time interval.
Preferably, the reference signal channel of the data frame is a comb reference signal channel.
Preferably, the control channel in the 1 st transmission time interval occupies resource elements except the reference signal channel in the 1 st symbol in the 1 st transmission time interval;
the primary synchronization signal channel occupies frequency resources in the 2 nd symbol in the 1 st transmission time interval;
the secondary synchronization signal channel occupies a frequency resource in a 3 rd symbol in the 1 st transmission time interval;
the broadcast channel occupies frequency resources in the 6 th symbol in the 1 st transmission time interval;
a guard interval in the 1 st transmission time interval occupies frequency resources in the last 1 symbol in the 1 st transmission time interval;
the shared channel in the 1 st transmission time interval occupies frequency resources in the remaining symbols in the 1 st transmission time interval;
the control channels in the transmission time intervals except the 1 st transmission time interval respectively occupy the resource units except the reference signal channel in the 1 st symbol of the transmission time intervals except the 1 st transmission time interval;
the discovery signal channels respectively occupy frequency resources within a 2 nd symbol of a transmission time interval except the 1 st transmission time interval;
the guard intervals in the transmission time intervals except the 1 st transmission time interval respectively occupy frequency resources in the last 1 symbol of the transmission time intervals except the 1 st transmission time interval;
the shared channels in the transmission time intervals except the 1 st transmission time interval respectively occupy frequency resources in the rest symbols of the transmission time intervals except the 1 st transmission time interval.
Preferably, the control channel in the 1 st transmission time interval occupies resource elements except the reference signal channel in the 1 st symbol in the 1 st transmission time interval;
the primary synchronization signal channel occupies the middle 72 resource units of the 2 nd symbol in the 1 st transmission time interval;
the secondary synchronization signal channel occupies the middle 72 resource units of the 3 rd symbol in the 1 st transmission time interval;
the broadcast channel occupies the middle 180 resource units of the 6 th symbol in the 1 st transmission time interval;
the guard interval in the 1 st transmission time interval occupies all resource units of the last 1 symbol in the 1 st transmission time interval;
the shared channel in the 1 st transmission time interval occupies all resource units in the remaining symbols in the 1 st transmission time interval;
the control channels in the transmission time intervals except the 1 st transmission time interval respectively occupy the resource units except the reference signal channel in the 1 st symbol of the transmission time intervals except the 1 st transmission time interval;
the discovery signal channels respectively occupy the middle 72 resource units of the 2 nd symbol of the transmission time interval except the 1 st transmission time interval;
the guard intervals in the transmission time intervals except the 1 st transmission time interval respectively occupy all resource units of the last 1 symbol of the transmission time intervals except the 1 st transmission time interval;
the shared channels of the transmission time intervals except the 1 st transmission time interval respectively occupy all resource units in the rest symbols of the transmission time intervals except the 1 st transmission time interval.
A data transmission method is applied to a communication node of a broadband MESH network, and the communication node stores the format information of the data frame proposed by the invention and the transmission time interval information of the data frame available per se;
the method comprises the following steps:
determining the self-available data frame transmission time interval according to the stored self-available data frame transmission time interval information;
according to the format information of the data frame, sending data information in the self available data frame transmission time interval; wherein the sending data information in the self-available data frame transmission time interval comprises sending a pilot signal in a reference signal channel of the self-available data frame transmission time interval.
Preferably, when the communication node is a master node, the self-available data frame transmission time interval is the 1 st data frame transmission time interval;
wherein the sending data information in the self-available data frame transmission time interval further comprises:
and transmitting a broadcast signal in a broadcast channel of the self-available data frame transmission time interval.
Preferably, the transmitting a broadcast signal in a broadcast channel of the self-available data frame transmission time interval includes:
and transmitting transmission time interval scheduling information in a broadcast channel of the self-available data frame transmission time interval.
A data transmission apparatus applied to a communication node of a broadband MESH network, the apparatus comprising:
the data storage unit is used for storing the format information of the data frame and the self available data frame transmission time interval information;
the information confirming unit is used for confirming the self-available data frame transmission time interval according to the stored self-available data frame transmission time interval information;
the data sending unit is used for sending data information in the self available data frame transmission time interval according to the format information of the data frame; wherein the sending data information in the self-available data frame transmission time interval comprises sending a pilot signal in a reference signal channel of the self-available data frame transmission time interval.
Preferably, when the apparatus is applied to a master node of a broadband MESH network, the transmission time interval of the data frame stored in the data storage unit and available to the data storage unit is the 1 st transmission time interval of the data frame;
wherein, when the data sending unit sends data within the self-available data frame transmission time interval, the data sending unit is further specifically configured to:
and transmitting a broadcast signal in a broadcast channel of the self-available data frame transmission time interval.
Preferably, when the data sending unit sends the broadcast signal in the broadcast channel of the self-available data frame transmission time interval, the data sending unit is specifically configured to:
and transmitting transmission time interval scheduling information in a broadcast channel of the self-available data frame transmission time interval.
A data transmission apparatus applied to a communication node of a broadband MESH network, the apparatus comprising:
a memory and a processor;
the memory is connected with the processor and used for storing programs and data generated in the program running process;
the processor is used for realizing the following functions by running the program in the memory:
storing the format information of the data frame proposed by the invention and the self-available data frame transmission time interval information; determining the self-available data frame transmission time interval according to the stored self-available data frame transmission time interval information; according to the format information of the data frame, sending data information in the self available data frame transmission time interval; wherein the sending data information in the self-available data frame transmission time interval comprises sending a pilot signal in a reference signal channel of the self-available data frame transmission time interval.
Preferably, when the device is applied to a master node of a broadband MESH network, the transmission time interval of the data frame stored by the processor and available for the processor is the 1 st transmission time interval of the data frame;
wherein, when the processor sends data within the data frame transmission time interval available to itself, the processor is further specifically configured to:
and transmitting a broadcast signal in a broadcast channel of the self-available data frame transmission time interval.
The data frame provided by the invention comprises a set number of transmission time intervals, wherein each transmission time interval at least comprises 2 reference signal channels for transmitting pilot signals; the 1 st transmission time interval in the transmission time intervals of the set number further comprises a control channel, a main synchronous signal channel, an auxiliary synchronous signal channel, a broadcast channel, a shared channel and a guard interval; the transmission time intervals except the 1 st transmission time interval respectively comprise a control channel, a discovery signal channel, a shared channel and a guard interval; wherein the 2 nd time slot of the last 1 transmission time interval further comprises a set number of access signal channels. By adopting the data frame format provided by the invention to transmit data, at least 2 channels can be used for transmitting pilot signals in each transmission time interval, the transmitted pilot signals are more, the positions for transmitting the pilot signals are more flexible, a communication node can acquire a channel estimation value through the pilot signals, and the network mobility is improved. Moreover, the data frame provided by the invention can be used for transmitting synchronous signals, discovery signals and access signals, so that the construction of a synchronous MESH network is supported, and compared with an asynchronous MESH network, the network delay is smaller.
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 described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a data frame according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a data transmission method according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a data frame transmission time interval division according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a data frame transmission time interval configuration according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another data transmission apparatus according to an embodiment of the present invention.
Detailed Description
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 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 embodiment of the invention discloses a data frame, which is shown in figure 1 and comprises the following components:
a set number of transmission time intervals, each transmission time interval at least comprising 2 reference signal channels for transmitting pilot signals;
specifically, as shown in fig. 1, in the data frame structure design provided in the embodiment of the present invention, the Time length of each data frame is n milliseconds, and is specifically divided into a set number of Transmission Time Intervals (TTIs). In the embodiment of the present invention, as shown in fig. 1, the data frame is divided into n transmission time intervals T0-Tn-1, and each transmission time interval is 1 ms. Each TTI contains 2 slot slots, each slot having a time length of 0.5 ms. Each TTI corresponds to 1 sending node and a plurality of receiving nodes, the sending node sends a plurality of groups of data in the TTI occupied by the sending node in a frequency division multiplexing mode, and each group of data corresponds to one receiving node.
The value of the number n of transmission time intervals included in the data frame is limited by the following factors: 1. the value of n should be greater than the maximum number of nodes accommodated by the broadband MESH network, so as to ensure that each node can occupy at least 1 TTI to transmit data in each frame. 2. The larger the value of n, the larger the multi-hop network delay, and the longer it takes to detect the synchronization signal, the worse the performance, and therefore, in principle, n does not exceed 20.
It should be particularly noted that, based on the structural design of the data frame proposed by the above embodiment of the present invention, at least 2 Reference Signal (RS) channels are respectively set in each transmission time interval of the data frame proposed by the embodiment of the present invention, and are used for transmitting pilot signals. As shown in the figure by the comb-like shading in the 1 st and 4 th symbols of the last TTI, and by the comb-like shading in the 1/4/8/11 th symbol of the other TTI. Based on the above arrangement, at least 2 RS channels are used for transmitting pilot channels in each TTI. Because each TTI is used for one node to send data, each node can send a plurality of groups of pilot signals when sending data, compared with the prior art, the number of the pilot signals sent by the communication node is more, the position selection of the pilot signals is more flexible, and the node receiving the data packet can more accurately obtain the channel estimation value through the pilot signals, so that the mobility of the broadband MESH network is stronger, and the network transmission rate is higher.
The 1 st transmission time interval in the transmission time intervals of the set number further comprises a control channel, a main synchronous signal channel, an auxiliary synchronous signal channel, a broadcast channel, a shared channel and a guard interval;
each transmission time interval except the 1 st transmission time interval respectively comprises a control channel, a discovery signal channel, a shared channel and a guard interval; wherein the 2 nd slot of the last 1 transmission time interval also includes an access signal channel.
Specifically, the 1 st TTI of the data frame proposed in the embodiment of the present invention is generally allocated to the master node of the broadband MESH network. As shown in fig. 1, in the 1 st transmission time interval T0(TTi (i ═ 0)) of the data frame, there are further provided:
a Control Channel (CCH), a resource unit shown by a shaded part in a 1 st symbol in the figure, for carrying information such as a modulation and coding mode of a data Channel (shared Channel), a time-frequency resource position of the data Channel, a power difference between a pilot signal and a data signal, and the like;
primary Synchronization Signal (PSS) channel, as shown by the shaded part in the 2 nd symbol in the figure, the Primary node sends 1 secondary Primary Synchronization Signal in the PSS channel per frame, and the rest nodes acquire the MESH network frame boundary according to the received Primary Synchronization Signal;
an auxiliary Synchronization Signal (SSS) channel, as shown by a shaded portion in a 3 rd symbol in the figure, where each frame of a master node transmits 1-time auxiliary Synchronization Signal in the SSS channel, and the remaining nodes acquire MESH network ID numbers according to the received auxiliary Synchronization signals;
broadcast Channel (BCH), as shown by the shaded part in the 6 th symbol in the figure, the main node sends 1 Broadcast signal through the Broadcast Channel per frame, and the Broadcast signal carries basic information such as the frame number, the network bandwidth, whether the current network allows access, and the like;
a Shared Channel (SCH), as shown by a non-shaded portion in the figure, the SCH is used for carrying data information, supporting QPSK/16QAM/64QAM modulation, and transmitting antenna diversity and transmitting antenna spatial multiplexing;
guard Period (GP), located in the last 1 symbol of TTI, as shown by the shaded part of the last 1 symbol in the figure, is used as a Guard time interval between two TTIs, specifically for transmission-reception switching, to prevent data transmission of two consecutive TTIs from overlapping.
Correspondingly, TTIs of the data frame proposed by the embodiment of the present invention, except for the 1 st TTI, are respectively allocated to each slave node in the broadband MESH network for use. As shown in fig. 1, in the data frame transmission time intervals T1 through Tn-1 (specifically TTi (i is 1 through n-1)), there are further provided:
a Control Channel (CCH), as shown by a non-shaded portion of a 1 st symbol in a TTi (i ═ 1 to n-1) in the figure, is used for carrying information such as a modulation and coding scheme of a data Channel (shared Channel), a time-frequency resource position of the data Channel, and a power difference between a pilot signal and a data signal;
a Discovery Signal (DIS) channel, as shown by a shaded portion of a 2 nd symbol in TTi (i ═ 1 to n-1) in the figure, where each slave node transmits a Discovery Signal in the DIS channel of each TTi (the Discovery Signal is similar to a primary synchronization Signal, and if a master node has transmitted a synchronization Signal in a TTi occupied by itself, the master node does not need to transmit the Discovery Signal again), and a receiving node acquires a TTi boundary at a receiver according to the Discovery Signal, and determines whether a node in a network is a neighbor node;
a Shared Channel (SCH), as shown by a non-shaded portion in a TTi (i ═ 1 to n-1) in the figure, the SCH is used for carrying data information, supports QPSK/16QAM/64QAM modulation, and performs transmit antenna diversity and transmit antenna spatial multiplexing;
guard Period (GP), located in the last 1 symbol of TTi (i ═ 1 to n-1) in the figure, as shown by the shaded part of the last 1 symbol of TTi (i ═ 1 to n-1) in the figure, as a Guard time interval between two TTIs, specifically used for transmission-reception switching, to prevent data transmission of two consecutive TTIs from overlapping;
an Access Signal (Access Signal) channel is located in the 2 nd slot of the last 1 TTI of the data frame, and specifically, as shown in fig. 1, the 1 st slot of the last 1 TTI of the 1 frame transmits service data, the 2 nd slot transmits an Access Signal, and a guard interval is set between the Access Signal and the service data to avoid aliasing of interference between the Access Signal and the service data. The node to be added into the network sends an access signal through an access signal channel, the main node judges whether a new node is accessed according to the access signal, searches the position of a relevant peak value of the access signal and adjusts the frame boundary of the access node according to the position so as to enable the frame boundary of all the nodes in the network to be basically synchronous. Specifically, a master node sends a synchronization signal PSS/SSS and a broadcast signal in the 1 st TTI, a network node to be accessed acquires and receives synchronization information by detecting the PSS/SSS/broadcast signal, then randomly selects 1 Access signal channel and sends the Access signal in the 2 nd slot (from multiple sets of frequency division Access signal channels) of the last 1 TTI of the 1 frame, the master node detects the Access signal, calculates the time advance and forwards the time advance to the network node to be accessed, and finally the network node to be accessed acquires the same transmission synchronization information as the master node.
It should be noted that the length of each symbol, the subcarrier interval, the number of subcarrier resource units, the cyclic prefix length, and the like of the data frame proposed in the embodiment of the present invention are the same as the frame format of the LTE downlink common cyclic prefix, and the pilot interval setting is also the same as the LTE downlink pilot interval setting, which is not described in detail here. Based on the above arrangement, when the data frame provided by the embodiment of the invention is applied to the broadband MESH network to transmit data, the broadband MESH network has the performance of an LTE downlink communication network, the signal transmission distance is longer, the data transmission rate is higher, and the network mobility is better. The frame structure supports the construction of a self-organizing MESH network, and the corresponding point-to-point peak transmission rate is 70Mbps (the bandwidth is 10M).
In addition, the frame structure provided by the embodiment of the invention can transmit the synchronous signal, the discovery signal and the access signal, so that the frame structure supports the synchronous MESH network, and compared with the asynchronous WIFImesh network based on a competition mechanism, the network delay is relatively smaller.
The data frame provided by the embodiment of the invention comprises a set number of transmission time intervals, wherein each transmission time interval at least comprises 2 reference signal channels for transmitting pilot signals; the 1 st transmission time interval in the transmission time intervals of the set number further comprises a control channel, a main synchronous signal channel, an auxiliary synchronous signal channel, a broadcast channel, a shared channel and a guard interval; the transmission time intervals except the 1 st transmission time interval respectively comprise a control channel, a discovery signal channel, a shared channel and a guard interval; wherein the 2 nd time slot of the last 1 transmission time interval further comprises a set number of access signal channels. By adopting the data frame format provided by the invention to transmit data, at least 2 channels can be used for transmitting pilot signals in each transmission time interval, the transmitted pilot signals are more, the positions for transmitting the pilot signals are more flexible, a communication node can acquire a channel estimation value through the pilot signals, and the network mobility is improved.
Optionally, in another embodiment of the present invention, referring to fig. 1, a reference signal channel in the last 1 transmission time interval of the data frame occupies frequency resources in the 1 st symbol and the 4 th symbol of the last 1 transmission time interval;
the reference signal channels of the transmission time intervals except the last 1 transmission time interval of the data frame respectively occupy frequency resources in the 1 st, 4 th, 8 th and 11 th symbols of the transmission time intervals except the last 1 transmission time interval.
Specifically, in the embodiment of the present invention, a position of the reference signal channel within each transmission time interval of the data frame is further limited and explained. In each TTI of the data frame shown in fig. 1, except for the last TTI, TTI (i ═ 0 to n-2) includes two slots slot, and both slots can be used for transmitting data; and the 2 nd slot of the last TTI of the data frame is used as an access signal channel, so only the 1 st slot is left for data transmission.
In order to ensure that a node receiving data obtains a channel estimation value through a pilot signal, a data frame provided in the embodiment of the present invention sets a plurality of reference signal channels in each transmission time interval, and specifically, sets 2 reference signal channels in 2 time slots of each transmission time interval TTI. As shown in fig. 1, in TTi (i ═ 0 to n-2), a reference signal channel is set in the 1/4/8/11 th symbol of each transmission time interval, respectively; and for the last transmission time interval TTi (i ═ n-1), since its 2 nd slot is set as the access signal channel and cannot be used to transmit data, the reference signal channel is set only in the 1/4 th symbol of its 1 st slot.
It should be noted that the embodiment of the present invention is only used to exemplify a scheme for arranging and setting time-frequency resources occupied by each reference signal channel when a plurality of reference signal channels are set in a data frame transmission time interval, and by applying the scheme of the embodiment of the present invention, a good communication effect can be obtained in practical use. In the actual application process, the time-frequency resources of each reference signal channel can be flexibly set according to the application scene and the resource condition limitation. On the premise of setting a plurality of reference signal channels for a data frame transmission time interval, any setting scheme of time-frequency resources of the plurality of reference signal channels can be adopted by the embodiment of the invention in theory, and is within the protection scope of the embodiment of the invention.
Optionally, in another embodiment of the present invention, the reference signal channel of the data frame is a comb reference signal channel.
Specifically, referring to fig. 1, the embodiment of the present invention sets the reference signal channels in each transmission time interval of the data frame to be comb-distributed. Specifically, in a symbol where a reference signal channel is located, when a single antenna transmits, a pilot resource unit is set every 6 resource units in a frequency domain; when the dual-antenna transmission is carried out, a pilot frequency resource unit is arranged in every 3 resource units in the frequency domain.
Optionally, in another embodiment of the present invention, the control channel in the 1 st transmission time interval occupies resource elements except for the reference signal channel in the 1 st symbol in the 1 st transmission time interval;
the primary synchronization signal channel occupies frequency resources in the 2 nd symbol in the 1 st transmission time interval;
the secondary synchronization signal channel occupies a frequency resource in a 3 rd symbol in the 1 st transmission time interval;
the broadcast channel occupies frequency resources in the 6 th symbol in the 1 st transmission time interval;
a guard interval in the 1 st transmission time interval occupies frequency resources in the last 1 symbol in the 1 st transmission time interval;
the shared channel in the 1 st transmission time interval occupies frequency resources in the remaining symbols in the 1 st transmission time interval;
the control channels in the transmission time intervals except the 1 st transmission time interval respectively occupy the resource units except the reference signal channel in the 1 st symbol of the transmission time intervals except the 1 st transmission time interval;
the discovery signal channels respectively occupy frequency resources within a 2 nd symbol of a transmission time interval except the 1 st transmission time interval;
the guard intervals in the transmission time intervals except the 1 st transmission time interval respectively occupy frequency resources in the last 1 symbol of the transmission time intervals except the 1 st transmission time interval;
the shared channels in the transmission time intervals except the 1 st transmission time interval respectively occupy frequency resources in the rest symbols of the transmission time intervals except the 1 st transmission time interval.
Specifically, in the embodiment of the present invention, time domain resources occupied by a control channel, a primary synchronization signal channel, a secondary synchronization signal channel, a broadcast channel, a guard interval, a shared channel, and a discovery signal channel of a data frame are defined. According to the arrangement of the time domain resources of each channel, the frequency domain resources can be flexibly arranged and occupied by each channel in the occupied time domain resources without influencing the normal communication function.
Optionally, in another embodiment of the present invention, the control channel in the 1 st transmission time interval occupies resource elements except for the reference signal channel in the 1 st symbol in the 1 st transmission time interval;
the primary synchronization signal channel occupies the middle 72 resource units of the 2 nd symbol in the 1 st transmission time interval;
the secondary synchronization signal channel occupies the middle 72 resource units of the 3 rd symbol in the 1 st transmission time interval;
the broadcast channel occupies the middle 180 resource units of the 6 th symbol in the 1 st transmission time interval;
the guard interval in the 1 st transmission time interval occupies all resource units of the last 1 symbol in the 1 st transmission time interval;
the shared channel in the 1 st transmission time interval occupies all resource units in the remaining symbols in the 1 st transmission time interval;
the control channels in the transmission time intervals except the 1 st transmission time interval respectively occupy the resource units except the reference signal channel in the 1 st symbol of the transmission time intervals except the 1 st transmission time interval;
the discovery signal channels respectively occupy the middle 72 resource units of the 2 nd symbol of the transmission time interval except the 1 st transmission time interval;
the guard intervals in the transmission time intervals except the 1 st transmission time interval respectively occupy all resource units of the last 1 symbol of the transmission time intervals except the 1 st transmission time interval;
the shared channels of the transmission time intervals except the 1 st transmission time interval respectively occupy all resource units in the rest symbols of the transmission time intervals except the 1 st transmission time interval.
Specifically, in this embodiment, the time-frequency resources of each channel of the data frame are specifically set, and the time-frequency resources occupied by each channel are arranged in a lump. Wherein, for the control channel CCH, the control channel CCH and the reference signal channel are set to occupy the same time domain resource. In the aspect of frequency domain, in the case of single-antenna transmission, one pilot resource unit is set as a reference signal channel in every 6 resource units in the frequency domain, and in the case of dual-antenna transmission, one pilot resource unit is set as a reference signal channel in every 3 resource units in the frequency domain, and the remaining resource units are used as control channels CCH.
It should be noted that, the embodiment of the present invention only illustrates specific settings of time-frequency resources of each channel, and does not strictly limit the time-frequency resources occupied by each channel in the data frame provided in the embodiment of the present invention. In practical use, the time-frequency resources of each channel of the data frame provided by the embodiment of the invention can be set as a basis, and the time-frequency resources occupied by each channel can be flexibly adjusted.
The embodiment of the invention discloses a data transmission method, which is applied to a communication node of a broadband MESH network, wherein the communication node stores format information of a data frame provided by any one of the embodiments and available data frame transmission time interval information;
specifically, in the embodiment of the present invention, the communication node in the broadband MESH network stores the format information of the data frame proposed in any one of the embodiments, specifically including time-frequency resource information and the like occupied by each channel of the data frame. In addition, since the data frame proposed in the above embodiment includes a set number of transmission time intervals, each transmission time interval being allocated to one communication node for transmitting data, the communication nodes in the network need to simultaneously store the data frame transmission time interval information available to themselves, i.e. to specify which transmission time interval they can occupy to transmit data.
Referring to fig. 2, the data transmission method proposed in this embodiment includes:
s201, determining the transmission time interval of the self-available data frame according to the stored self-available data frame transmission time interval information;
specifically, in the broadband MESH network, the allocation of each transmission time interval of the data frame is executed by the network system and broadcast by the network master node, and after receiving the broadcast, each slave node stores the transmission time interval information available to itself and occupies the transmission time intervals in order according to the allocation. Therefore, when a communication node needs to send data, it needs to first determine which transmission time interval the communication node can occupy to send data through the stored data frame transmission time interval information available to the communication node itself, so as to avoid collision with other nodes.
It can be understood that, if the broadband MESH network is set such that each node occupies a fixed transmission time interval to transmit data, the data frame transmission time interval information that is available to the communication node itself and is acquired and stored by the communication node is fixed, and the transmission time interval occupied by each communication is also fixed, at this time, when the communication node transmits data, step S201 may be skipped, and step S202 may be directly executed.
S202, sending data information in the self available data frame transmission time interval according to the format information of the data frame; wherein the sending data information in the self-available data frame transmission time interval comprises sending a pilot signal in a reference signal channel of the self-available data frame transmission time interval.
Specifically, after determining the transmission time interval allocated to the communication node, the communication node transmits data in the transmission time interval, specifically, transmits corresponding data in each channel of the transmission time interval occupied by the communication node.
When transmitting data, the communication node transmits a pilot signal through the reference signal channel at the same time. In order to ensure that the data receiving side can accurately obtain the channel estimation value through the received data and improve the network mobility, when the communication node transmits data, pilot signals are transmitted in a plurality of reference signal channels as much as possible, and the number of the transmitted pilot signals is determined by negotiation between the two communication sides.
The data transmission method provided by the embodiment of the invention is applied to a communication node of a broadband MESH network, and the communication node stores the format information of the data frame provided by any one of the embodiments and the transmission time interval information of the data frame available for the communication node; the method comprises the following steps: determining the self-available data frame transmission time interval according to the stored self-available data frame transmission time interval information; according to the format information of the data frame, sending data information in the self available data frame transmission time interval; wherein the sending data information in the self-available data frame transmission time interval comprises sending a pilot signal in a reference signal channel of the self-available data frame transmission time interval. In the above technical solution, the communication node according to the above embodiment proposes that data is sent in a data frame format, and multiple sets of pilot signals can be sent in one data packet, thereby improving network mobility.
Optionally, in another embodiment of the present invention, when the communication node is a master node, the self-available data frame transmission time interval is a 1 st data frame transmission time interval;
wherein the sending data information in the self-available data frame transmission time interval further comprises:
and transmitting a broadcast signal in a broadcast channel of the self-available data frame transmission time interval.
Specifically, the transmission time interval 1 of the data frame proposed in the above embodiment is usually allocated to the master node of the broadband MESH network for use because it includes a synchronization signal channel. That is, the master node in the broadband MESH network occupies the 1 st transmission time interval of the data frame. When the master node transmits data, the master node may transmit a broadcast signal through a broadcast channel of an occupied transmission time interval. Specifically, the information carried in the broadcast signal is system setting information, such as information about a channel carrying frame number, a network bandwidth, whether the current network allows access, and the like. The master node transmits the system setting information to all nodes of the network through the broadcast signal.
Optionally, in another embodiment of the present invention, the sending a broadcast signal in a broadcast channel of the self-available data frame transmission time interval includes:
and transmitting transmission time interval scheduling information in a broadcast channel of the self-available data frame transmission time interval.
Specifically, for the data frame proposed in the above embodiment, the network system may further dynamically allocate the transmission time interval of the data frame, that is, dynamically allocate the transmission time interval to the communication node. Then, the system sends the distribution information to each node of the network through the main node broadcast channel, and the overall control of the network is realized.
For example, as described with reference to fig. 3, 1 data frame includes n TTIs, where the first n1 TTIs are statically allocated TTIs. By statically allocated TTI is meant that the network has pre-allocated the TTI to be transmitted by which MESH node. Statically allocated TTIs typically transport the necessary signaling messages to maintain the network and network delay sensitive traffic. Statically allocating TTIs can ensure the timeliness of signaling messages and network delay-sensitive traffic transmissions. The remaining TTIs in the data frame are dynamically scheduled TTIs. And the master node dynamically schedules TTI resources for the network nodes according to the cache state reports reported by the slave nodes. Dynamically scheduled TTI transmissions are typically data flow traffic.
The values of n, n1, n2 can be flexibly configured according to different practical application scenarios of the broadband MESH network. The configuration process is similar to the LTE TDD uplink and downlink matching process. A typical allocation scenario is shown in fig. 4, where different Configuration values correspond to different communication scenario configurations in fig. 4.
Based on the above setting, when the network system needs to perform scheduling configuration on the data frame transmission time interval, the network system sends the scheduling information to the network main node, and the network main node broadcasts the scheduling information through the broadcast channel, so that each node in the network acquires the scheduling information and occupies the transmission time interval according to the scheduling information.
Based on the above processing, the frame structure applied in the embodiment of the present invention is suitable for various application scenarios, for example, for a service scenario requiring a low network delay or a service scenario requiring a large number of nodes accommodated by a network and supporting multiple data streams, the requirement can be met only by adjusting the time interval distribution of the frame structure, and the frame structure applied in the embodiment of the present invention has a wider application range.
The embodiment of the invention discloses a data sending device, which is applied to a communication node of a broadband MESH network, and is shown in figure 5, and the device comprises:
a data storage unit 501, configured to store format information of the data frame proposed in the foregoing embodiment and data frame transmission time interval information available to itself;
an information confirming unit 502, configured to determine an available data frame transmission time interval according to the stored available data frame transmission time interval information;
a data sending unit 503, configured to send data information within the self-available data frame transmission time interval according to the format information of the data frame; wherein the sending data information in the self-available data frame transmission time interval comprises sending a pilot signal in a reference signal channel of the self-available data frame transmission time interval.
Specifically, please refer to the content of the corresponding method embodiment for the specific working content of each unit in this embodiment, which is not described herein again.
The data sending device provided by the embodiment of the invention is applied to a broadband MESH network communication node, and the data storage unit 501 stores the format information of the data frame provided by the embodiment and the transmission time interval information of the data frame available for the data storage unit; when sending data, the information confirming unit 502 determines the self available data frame transmission time interval according to the stored self available data frame transmission time interval information; then, the data sending unit 503 sends data information within the self available data frame transmission time interval according to the format information of the data frame; wherein the sending data information in the self-available data frame transmission time interval comprises sending a pilot signal in a reference signal channel of the self-available data frame transmission time interval. By adopting the technical scheme, the communication node sends data in a data frame format according to the embodiment, and can send a plurality of groups of pilot signals in one data packet, so that the network mobility is improved.
Optionally, in another embodiment of the present invention, when the apparatus is applied to a master node of a broadband MESH network, the transmission time interval of the data frame available to itself stored in the data storage unit 501 is the 1 st transmission time interval of the data frame;
when the data sending unit 503 sends data within the self-available data frame transmission time interval, it is further specifically configured to:
and transmitting a broadcast signal in a broadcast channel of the self-available data frame transmission time interval.
Specifically, please refer to the content of the corresponding method embodiment for the specific working content of the data sending unit 503 in this embodiment, which is not described herein again.
Optionally, in another embodiment of the present invention, when the data sending unit 503 sends the broadcast signal in the broadcast channel of the self-available data frame transmission time interval, specifically, the data sending unit is configured to:
and transmitting transmission time interval scheduling information in a broadcast channel of the self-available data frame transmission time interval.
Specifically, please refer to the content of the corresponding method embodiment for the specific working content of the data sending unit 503 in this embodiment, which is not described herein again.
The embodiment of the present invention further discloses another data sending apparatus, which is applied to a communication node of a broadband MESH network, and as shown in fig. 6, the apparatus includes:
a memory 601 and a processor 602;
the memory 601 is connected to the processor 602, and is used for storing programs and data generated during the program running process;
a processor 602, configured to implement the following functions by executing the program in the memory 601:
storing format information of the data frame proposed by the embodiment and self-available data frame transmission time interval information; determining the self-available data frame transmission time interval according to the stored self-available data frame transmission time interval information; according to the format information of the data frame, sending data information in the self available data frame transmission time interval; wherein the sending data information in the self-available data frame transmission time interval comprises sending a pilot signal in a reference signal channel of the self-available data frame transmission time interval.
The data sending device provided by the embodiment of the invention is applied to a communication node of a broadband MESH network, and a processor 602 of the data sending device stores format information of a data frame provided by the embodiment and available data frame transmission time interval information of the processor; when sending data, the processor 602 first determines a self available data frame transmission time interval according to the stored self available data frame transmission time interval information; then according to the format information of the data frame, sending data information in the self available data frame transmission time interval; wherein the sending data information in the self-available data frame transmission time interval comprises sending a pilot signal in a reference signal channel of the self-available data frame transmission time interval. By adopting the technical scheme, the communication node sends data in a data frame format according to the embodiment, and can send a plurality of groups of pilot signals in one data packet, so that the network mobility is improved.
Optionally, in another embodiment of the present invention, when the apparatus is applied to a master node of a broadband MESH network, the transmission time interval of the data frame available to the processor 602 is stored as the 1 st transmission time interval of the data frame;
when the processor 602 sends data in the available data frame transmission time interval, the processor is further specifically configured to:
and transmitting a broadcast signal in a broadcast channel of the self-available data frame transmission time interval.
Specifically, please refer to the contents of the corresponding method embodiment for the specific working contents of the processor 602 in this embodiment, which are not described herein again.
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.
Claims (12)
1. A data transmission method is characterized in that the method is applied to a communication node of a broadband MESH network, and the communication node stores format information of a data frame of the broadband MESH network and self-available data frame transmission time interval information; the data frame of the broadband MESH network comprises a set number of transmission time intervals, and each transmission time interval at least comprises 2 reference signal channels used for transmitting pilot signals; the 1 st transmission time interval in the transmission time intervals of the set number further comprises a control channel, a main synchronous signal channel, an auxiliary synchronous signal channel, a broadcast channel, a shared channel and a guard interval; each transmission time interval except the 1 st transmission time interval respectively comprises a control channel, a discovery signal channel, a shared channel and a guard interval; wherein the 2 nd time slot of the last 1 transmission time interval further comprises an access signal channel; the discovery signal channel is used for the slave node of the broadband MESH network to send a discovery signal so that a receiving node receiving the discovery signal can judge whether the node in the network is a neighbor node according to the discovery signal; the access signal channel is used for sending an access signal by a node to be added into the broadband MESH network, so that a main node judges whether a new node is accessed according to the access signal and adjusts the frame boundary of the new node according to the access signal under the condition that the new node is accessed so as to synchronize the sending frame boundaries of all nodes in the network;
the method comprises the following steps:
determining the self-available data frame transmission time interval according to the stored self-available data frame transmission time interval information;
according to the format information of the data frame, sending data information in the self available data frame transmission time interval; wherein the sending data information in the self-available data frame transmission time interval comprises sending a pilot signal in a reference signal channel of the self-available data frame transmission time interval.
2. The method according to claim 1, wherein when the communication node is a master node, the self-available data frame transmission time interval is the 1 st data frame transmission time interval;
wherein the sending data information in the self-available data frame transmission time interval further comprises:
and transmitting a broadcast signal in a broadcast channel of the self-available data frame transmission time interval.
3. The method of claim 2, wherein transmitting a broadcast signal in a broadcast channel of the self-available data frame transmission time interval comprises:
and transmitting transmission time interval scheduling information in a broadcast channel of the self-available data frame transmission time interval.
4. The method of claim 1, wherein a reference signal channel in a last 1 transmission time interval of a data frame of the wideband MESH network occupies frequency resources in a 1 st symbol and a 4 th symbol of the last 1 transmission time interval;
the reference signal channels of the transmission time intervals except the last 1 transmission time interval of the data frame respectively occupy frequency resources in the 1 st, 4 th, 8 th and 11 th symbols of the transmission time intervals except the last 1 transmission time interval.
5. The method of claim 4, wherein the reference signal channel of the data frame of the wideband MESH network is a comb reference signal channel.
6. The method of claim 4, wherein the control channel in the 1 st transmission time interval occupies resource elements other than the reference signal channel in the 1 st symbol in the 1 st transmission time interval;
the primary synchronization signal channel occupies frequency resources in the 2 nd symbol in the 1 st transmission time interval;
the secondary synchronization signal channel occupies a frequency resource in a 3 rd symbol in the 1 st transmission time interval;
the broadcast channel occupies frequency resources in the 6 th symbol in the 1 st transmission time interval;
a guard interval in the 1 st transmission time interval occupies frequency resources in the last 1 symbol in the 1 st transmission time interval;
the shared channel in the 1 st transmission time interval occupies frequency resources in the remaining symbols in the 1 st transmission time interval;
the control channels in the transmission time intervals except the 1 st transmission time interval respectively occupy the resource units except the reference signal channel in the 1 st symbol of the transmission time intervals except the 1 st transmission time interval;
the discovery signal channels respectively occupy frequency resources within a 2 nd symbol of a transmission time interval except the 1 st transmission time interval;
the guard intervals in the transmission time intervals except the 1 st transmission time interval respectively occupy frequency resources in the last 1 symbol of the transmission time intervals except the 1 st transmission time interval;
the shared channels in the transmission time intervals except the 1 st transmission time interval respectively occupy frequency resources in the rest symbols of the transmission time intervals except the 1 st transmission time interval.
7. The method of claim 4, wherein the control channel in the 1 st transmission time interval occupies resource elements other than the reference signal channel in the 1 st symbol in the 1 st transmission time interval;
the primary synchronization signal channel occupies the middle 72 resource units of the 2 nd symbol in the 1 st transmission time interval;
the secondary synchronization signal channel occupies the middle 72 resource units of the 3 rd symbol in the 1 st transmission time interval;
the broadcast channel occupies the middle 180 resource units of the 6 th symbol in the 1 st transmission time interval;
the guard interval in the 1 st transmission time interval occupies all resource units of the last 1 symbol in the 1 st transmission time interval;
the shared channel in the 1 st transmission time interval occupies all resource units in the remaining symbols in the 1 st transmission time interval;
the control channels in the transmission time intervals except the 1 st transmission time interval respectively occupy the resource units except the reference signal channel in the 1 st symbol of the transmission time intervals except the 1 st transmission time interval;
the discovery signal channels respectively occupy the middle 72 resource units of the 2 nd symbol of the transmission time interval except the 1 st transmission time interval;
the guard intervals in the transmission time intervals except the 1 st transmission time interval respectively occupy all resource units of the last 1 symbol of the transmission time intervals except the 1 st transmission time interval;
the shared channels of the transmission time intervals except the 1 st transmission time interval respectively occupy all resource units in the rest symbols of the transmission time intervals except the 1 st transmission time interval.
8. A data transmission apparatus, applied to a communication node of a broadband MESH network, the apparatus comprising:
the data storage unit is used for storing format information of a data frame of the broadband MESH network and self-available data frame transmission time interval information; the data frame of the broadband MESH network comprises a set number of transmission time intervals, and each transmission time interval at least comprises 2 reference signal channels used for transmitting pilot signals; the 1 st transmission time interval in the transmission time intervals of the set number further comprises a control channel, a main synchronous signal channel, an auxiliary synchronous signal channel, a broadcast channel, a shared channel and a guard interval; each transmission time interval except the 1 st transmission time interval respectively comprises a control channel, a discovery signal channel, a shared channel and a guard interval; wherein the 2 nd time slot of the last 1 transmission time interval further comprises an access signal channel; the discovery signal channel is used for the slave node of the broadband MESH network to send a discovery signal so that a receiving node receiving the discovery signal can judge whether the node in the network is a neighbor node according to the discovery signal; the access signal channel is used for sending an access signal by a node to be added into the broadband MESH network, so that a main node judges whether a new node is accessed according to the access signal and adjusts the frame boundary of the new node according to the access signal under the condition that the new node is accessed so as to synchronize the sending frame boundaries of all nodes in the network;
the information confirming unit is used for confirming the self-available data frame transmission time interval according to the stored self-available data frame transmission time interval information;
the data sending unit is used for sending data information in the self available data frame transmission time interval according to the format information of the data frame; wherein the sending data information in the self-available data frame transmission time interval comprises sending a pilot signal in a reference signal channel of the self-available data frame transmission time interval.
9. The apparatus of claim 8, wherein when the apparatus is applied to a master node of a broadband MESH network, the data storage unit stores a data frame transmission time interval available to itself as a data frame transmission time interval 1;
wherein, when the data sending unit sends data within the self-available data frame transmission time interval, the data sending unit is further specifically configured to:
and transmitting a broadcast signal in a broadcast channel of the self-available data frame transmission time interval.
10. The apparatus according to claim 9, wherein the data transmitting unit, when transmitting the broadcast signal in the broadcast channel of the self-available data frame transmission time interval, is specifically configured to:
and transmitting transmission time interval scheduling information in a broadcast channel of the self-available data frame transmission time interval.
11. A data transmission apparatus, applied to a communication node of a broadband MESH network, the apparatus comprising:
a memory and a processor;
the memory is connected with the processor and used for storing programs and data generated in the program running process;
the processor is used for realizing the following functions by running the program in the memory:
storing format information of a data frame of the broadband MESH network and self-available data frame transmission time interval information; the data frame of the broadband MESH network comprises a set number of transmission time intervals, and each transmission time interval at least comprises 2 reference signal channels used for transmitting pilot signals; the 1 st transmission time interval in the transmission time intervals of the set number further comprises a control channel, a main synchronous signal channel, an auxiliary synchronous signal channel, a broadcast channel, a shared channel and a guard interval; each transmission time interval except the 1 st transmission time interval respectively comprises a control channel, a discovery signal channel, a shared channel and a guard interval; wherein the 2 nd time slot of the last 1 transmission time interval further comprises an access signal channel; the discovery signal channel is used for the slave node of the broadband MESH network to send a discovery signal so that a receiving node receiving the discovery signal can judge whether the node in the network is a neighbor node according to the discovery signal; the access signal channel is used for sending an access signal by a node to be added into the broadband MESH network, so that a main node judges whether a new node is accessed according to the access signal and adjusts the frame boundary of the new node according to the access signal under the condition that the new node is accessed so as to synchronize the sending frame boundaries of all nodes in the network; determining the self-available data frame transmission time interval according to the stored self-available data frame transmission time interval information; according to the format information of the data frame, sending data information in the self available data frame transmission time interval; wherein the sending data information in the self-available data frame transmission time interval comprises sending a pilot signal in a reference signal channel of the self-available data frame transmission time interval.
12. The apparatus of claim 11 wherein when said apparatus is implemented in a master node of a broadband MESH network, said processor stores its own available data frame transmission time interval as the data frame transmission time interval # 1;
wherein, when the processor sends data within the data frame transmission time interval available to itself, the processor is further specifically configured to:
and transmitting a broadcast signal in a broadcast channel of the self-available data frame transmission time interval.
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