CN111818536A - Method and system for enhancing self-organizing network coverage - Google Patents
Method and system for enhancing self-organizing network coverage Download PDFInfo
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Abstract
The invention provides a method and a system for enhancing self-organizing network coverage, belonging to the technical field of communication. The method comprises the following steps: transmitting a transmission signal to an end node and starting a first timing; if the response frame information of the end node judges that the communication is successful before the first timing is finished, the communication process with the end node is finished, and if the result that the communication is not successful is returned before the first timing is finished, the network node which has a route with the end node is informed to be used as the proxy node of the end node; synchronizing the transmission signal to the agent node of the end node, then respectively sending the updated transmission signal after synchronization and the synchronized transmission signal to the end node by combining the agent node of the end node, and starting the second timing; the communication process with the end node is optionally ended earliest before the end of the second timing by receiving or not receiving the end node's response frame information. The invention is used for network coverage enhancement.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method for enhancing self-organizing network coverage, a system for enhancing self-organizing network coverage, an electronic device, and a computer-readable storage medium.
Background
The wireless communication system estimates the coverage radius through link budget, and generally performs coverage enhancement on poor signal coverage or signal coverage blind areas when the system is actually deployed, and the available technical means include a plurality of schemes as follows.
1) Increasing the transmission power of the central node: the scheme is simple to implement, but can cause the interference level among cells to be improved, and in addition, the coverage enhancement effect brought by increasing the transmitting power is very limited for some special coverage scenes such as basements, underground tunnels and the like; although this scheme can bring enhancement of coverage, the disadvantage is also obvious, firstly, interference among cells is increased, and problems such as handover coverage, frequent switching and the like are caused; secondly, the power efficiency is low, and the applicable scene is limited; thirdly, power consumption and cost are high; the performance requirement Of increasing the transmitting power on radio frequency front-end devices such as a Power Amplifier (PA) and the like is improved, the power consumption is high, and the cost Of BOM (Bill Of material) is improved.
2) A multiple retransmission mechanism: the scheme can maximally support 2048 downlink retransmissions at the cost of sacrificing the time delay of the system and replacing time or frequency or power/code channel resources for coverage enhancement, such as an NB-IoT system; however, the scheme has various defects, firstly, the resource utilization rate is low, and resources such as available time, available frequency, available power/code channels and the like of the system are sacrificed for retransmission, so that the system resources are greatly wasted; second, system capacity is limited, as previously mentioned, it is difficult to support user concurrency; and thirdly, the method is not suitable for the Internet of things or the self-organized network, the Internet of things system has the characteristics of low typical rate, a large number of concurrent users and low power consumption, and the frequent retransmission of the self-organized network causes the overload of the network.
3) The multi-antenna technology: the detection performance is improved by introducing a multi-antenna technology into a transmitting end (MISO, intelligent antenna beam forming), a receiving end (SIMO) or a transmitting end and a receiving end (MIMO), and the scheme is suitable for a cellular communication system and is not suitable for the Internet of things and a self-organizing network; in addition, the multi-antenna technology requires the support of multiple sets of transceiving channels, which may sharply increase the complexity, cost, power consumption, etc. of the device, while the internet of things system is sensitive to the cost, power consumption, etc.
4) Complex receiver algorithms: the scheme adopts algorithms with excellent performance and high complexity at a receiving end, such as maximum likelihood, Viterbi sequence equalization and the like, improves the sensitivity of a receiver by reducing the signal-to-noise ratio (SNR) required by a detection threshold, and increases the link budget of a system to equivalently enhance coverage; although the sensitivity can be reduced to increase the link budget, complex receiver algorithms can result in increased cost and power consumption.
5) Spread spectrum technology: spread spectrum techniques include Direct Sequence Spread Spectrum (DSSS) or Chip Spread Spectrum (CSS); a more typical system is LoRa, which is one of LPWAN communication technologies, and is an ultra-long distance wireless transmission scheme based on a spread spectrum technology adopted and popularized by Semtech corporation in America, and a simple system capable of realizing long distance, long battery life and large capacity is provided for users; LoRa improves the processing gain through direct sequence spread spectrum, however, for this scheme, the link budget of the system is more than 160dB, especially when the rate is less than 1kbps, the deep coverage effect is obvious; however, for this scheme, a large spreading factor is introduced to reduce the demodulation threshold of the receiver and improve the link budget of the system, so as to enhance the coverage, but the large spreading factor compromises the bandwidth and the rate, and sacrifices the bandwidth and the rate to improve the coverage performance, the working bandwidths of the internet of things and the wireless ad hoc network are generally narrow, the large spreading technology is adopted to not meet the rate requirement of the service, in addition, the spreading technology is defective, and the system performance is obviously deteriorated when the system capacity reaches a certain scale, such as self-interference, respiration effect, and the like.
Disclosure of Invention
The invention aims to provide a method and a system for enhancing the coverage of a self-organizing network, which solve the technical problems of difficult universality, reliability and the like of network coverage enhancement caused by harsh implementation conditions of the existing scheme.
In order to achieve the above object, an embodiment of the present invention provides a method for enhancing coverage of an ad hoc network, where the method includes:
transmitting a transmission signal to an end node and starting a first timing;
if the communication is determined to be successful by the response frame information of the end node before the first timing is finished, the communication process with the end node is finished,
if the result that the communication success is not obtained is returned before the first timing is finished, informing that the network node which has the route with the end node is taken as the proxy node of the end node;
synchronizing the transmission signal to the agent node of the end node, then combining the agent node of the end node to respectively send the updated transmission signal after synchronization and the synchronized transmission signal to the end node, and starting a second timing;
ending the communication process with the end node selectively earliest before the end of the second timing by receiving or not receiving the response frame information of the end node.
Specifically, if it is determined that the communication is successful by the response frame information of the end node before the end of the first timing, the ending of the communication process with the end node includes:
and if the positive feedback information responded by the end node is received before the first timing is finished, and the communication is judged to be successful, the communication process with the end node is finished.
Specifically, if a result of unsuccessful communication is returned before the end of the first timing, notifying that the network node having a route with the end node is used as a proxy node of the end node, includes:
if the negative feedback information responded by the end node is received before the first timing is finished, and the communication is judged to be failed, informing that a network node with a route with the end node is taken as a proxy node of the end node;
and if the positive feedback information or the negative feedback information responded by the end node is not received before the first timing is ended, judging that the response frame information of the end node is negative feedback information and judging that the communication fails, and informing a network node which has a route with the end node and is used as a proxy node of the end node after the first timing is ended.
Specifically, before the network node notifying that the end node has a route is used as a proxy node of the end node, the method further includes:
inquiring the adjacent node information corresponding to the end node according to the stored routing table;
and selecting the network node with the route with the tail end node according to the adjacent node information.
Specifically, after selecting the network node having the route with the end node according to the neighbor node information, and before notifying that the network node having the route with the end node is used as the proxy node of the end node, the method further includes:
taking the network node as a candidate agent node, and forming an agent node candidate set through the candidate agent node;
according to a network topology structure and the routing table, obtaining the proxy node sequence in the proxy node candidate set;
selecting a predefined number of agent nodes in sequence according to the order of the agent nodes, wherein,
the predefined number of proxy nodes is used for notification operations.
Specifically, the obtaining of the proxy node ranking in the proxy node candidate set according to the network topology and the routing table includes:
forming a proxy node default ordering in the proxy node candidate set according to a network topology structure and the routing table;
comparing the communication capacity of the agent nodes in the agent node candidate set with the communication capacity record of the end node;
and selectively adjusting the sequence corresponding to the proxy nodes in the proxy node candidate set in the default sequence according to the strength information of the communication capacity obtained after comparison.
Specifically, after the selecting a predefined number of proxy nodes in sequence and until the network node notifying that the end node has a route is used as the proxy node of the end node, the method includes:
generating an optimal proxy node set by the predefined number of proxy nodes;
notifying each proxy node in the optimal set of proxy nodes to be a proxy node for the end node.
Specifically, after synchronizing the transmission signal to the agent node of the end node, and before the agent node associated with the end node sends the updated transmission signal after synchronization and the synchronized transmission signal to the end node, respectively, and starts the second timing, the method further includes:
providing communication resource allocation information corresponding to the end node, and notifying the communication resource allocation information to a proxy node of the end node;
superimposing a random phase different from the proxy node of the end node.
Specifically, the sending, by the agent node associated with the end node, the updated transmission signal after synchronization and the synchronized transmission signal to the end node, and starting the second timing specifically includes:
and combining the proxy nodes of the end nodes, respectively sending the updated transmission signals after synchronization and the synchronized transmission signals to the end nodes at the same time, and starting second timing.
Specifically, the ending, by the receiving or not receiving the response frame information of the end node, of the communication process with the end node selectively earliest before the end of the second timing includes:
if the positive feedback information responded by the end node is received before the second timing is finished, and the communication is judged to be successful, the communication process with the end node is finished, and the agent node of the end node is released;
if the negative feedback information responded by the end node is received before the second timing is finished, and the communication is judged to be failed, releasing the proxy node of the end node, reselecting the network node with the route of the end node, and informing the reselected network node of being used as the current proxy node of the end node;
and if the negative feedback information responded by the end node is received or the positive feedback information or the negative feedback information responded by the end node is not received before the second timing of the last time is finished, and the reselected operation times reach the preset maximum times, judging that the response frame information of the end node is the negative feedback information and judging that the communication is failed, finishing the communication process with the end node, and releasing the proxy node of the end node.
The embodiment of the invention provides a method for enhancing the coverage of a self-organizing network, which comprises the following steps:
receiving a notification and a synchronous transmission signal of a proxy node as an end node, which is executed by the central node through the method;
and combining the central node to respectively send the synchronized transmission signal and the transmission signal updated after the synchronization of the central node to the end node.
The embodiment of the invention provides a method for enhancing the coverage of a self-organizing network, which comprises the following steps:
receiving the transmission signal sent by the central node through the aforementioned method, or,
receiving a synchronized updated transmission signal sent by the central node through the method and/or a synchronized transmission signal sent by the proxy node through the method;
and sending positive feedback information or negative feedback information to the central node in response to any received transmission signal.
The embodiment of the invention provides a system for enhancing the coverage of a self-organizing network, which comprises:
the central node sending module is used for sending a transmission signal to the end node and starting first timing;
a central node selection module for ending the communication process with the end node if the end node determines that the communication is successful by the response frame information of the end node before the first timing is ended,
if the result that the communication success is not obtained is returned before the first timing is finished, informing that the network node which has the route with the end node is taken as the proxy node of the end node;
a central node synchronization module, configured to synchronize the transmission signal to the agent node of the end node, and then combine the agent node of the end node to send a transmission signal updated after synchronization and a synchronized transmission signal to the end node, respectively, and start a second timing;
and the central node judging module is used for selecting the received or not received response frame information of the end node to finish the communication process with the end node earliest before the second timing is finished.
In another aspect, an embodiment of the present invention provides an electronic device, including:
at least one processor;
a memory coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, the at least one processor implements the aforementioned method by executing the instructions stored by the memory.
In yet another aspect, an embodiment of the present invention provides a computer-readable storage medium storing computer instructions, which, when executed on a computer, cause the computer to perform the foregoing method.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
FIG. 1 is a schematic diagram of the main method steps of an embodiment of the present invention;
fig. 2 is a communication network coverage diagram of exemplary nodes according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Example 1
The embodiment of the invention provides a method for enhancing the coverage of a self-organizing network, which can be used for a central node and comprises the following steps:
transmitting a transmission signal to an end node and starting a first timing;
if the communication is determined to be successful by the response frame information of the end node before the first timing is finished, the communication process with the end node is finished,
if the result that the communication success is not obtained is returned before the first timing is finished, informing that the network node which has the route with the end node is taken as the proxy node of the end node;
synchronizing the transmission signal to the agent node of the end node, then combining the agent node of the end node to respectively send the updated transmission signal after synchronization and the synchronized transmission signal to the end node, and starting a second timing;
ending the communication process with the end node selectively earliest before the end of the second timing by receiving or not receiving the response frame information of the end node.
The embodiment of the invention also provides a method for enhancing the coverage of the self-organizing network, which can be applied to the proxy node and comprises the following steps:
receiving a notification and a synchronized transmission signal of a proxy node as an end node, which are performed by the central node through the aforementioned method applied to the ad-hoc network coverage enhancement of the central node;
and combining the central node to respectively send the synchronized transmission signal and the transmission signal updated after the synchronization of the central node to the end node.
The embodiment of the invention also provides a method for enhancing the coverage of the self-organizing network, which can be applied to the terminal node and comprises the following steps:
receiving a transmission signal transmitted by a central node by the method of any one of claims 1 to 9, or,
receiving a transmission signal which is updated after synchronization and sent by the central node through the method applied to the coverage enhancement of the self-organization network of the central node and/or a synchronized transmission signal sent by the proxy node through the method applied to the coverage enhancement of the self-organization network of the proxy node;
and sending positive feedback information or negative feedback information to the central node in response to any received transmission signal.
In some specific implementations, the central node, the proxy node, and the end node provided in the embodiment of the present invention are all network nodes in a network, and in the embodiment of the present invention, a network node to be sent with service data may be a source network node, and at this time, the network node may be a central node, and a destination network node of the service data to be sent may be an end node, and the other network nodes may be alternative proxy nodes, and in addition, when the end node has new service data to be sent, a destination of the new service data to be sent is a central node, in this case, an original end node may be a new central node, and an original central node may be a new end node, and the foregoing method of the embodiment of the present invention is executed; in some cases, the central node may be a main control device (which may have a timer or a processor with a timing function) or an aggregation node of the ad hoc network, and is responsible for controlling and managing the whole network and aggregation of service data; the end node may be an end receiving device of the ad hoc network, and is generally located at the very end of the ad hoc network, and at this time, the end node may only support the functions of receiving the system broadcast information and sending its own data, and at this time, the end node may not have the functions of processing, forwarding, relaying, and the like of the system message and other end node data; the agent node can be a receiving device (which can have a timer or a processor with a timing function), the topological level in the network can be higher than that of the end node, the network has the functions of receiving system broadcast information and sending self data, and also has the capability of receiving, sending and forwarding non-self data assigned by the central node, the central node selects the agent node from the network nodes, and the agent node has certain timeliness.
The transmission signal can be a signal carrying service data to be sent by the central node to the end node and having a broadcast characteristic parameter; a first timing (a first type of timing operation) and a second timing (a second type of timing operation, where a time length of each first timing and a time length of each second timing may be the same or different, for example, a time length of the second timing may slightly increase relatively) may be configured as a timing operation that can be executed multiple times, and may be after the first timing is last after the first timing is ended and before the second timing is ended; the response frame information may be positive feedback information (ACK) or negative-feedback information (NAK or NACK) that the data frame has within the response signal; the route is a route selection process from a source address to a destination address in the network or between networks, and for an end node and a network node having a route with the end node, the network node can record an established route with the activity of the end node being subjected to historical routing, and the network node is adjacent to the end node and is in a neighboring node relationship.
For the transmission signal updated after synchronization and the transmission signal synchronized, part of frame information corresponding to the service data may be the same, but due to different devices and different network topology levels, broadcast characteristic parameters of the transmission signal may be different, such as power, signal field strength, and the like, but relative to the end node, corresponding data frames expressed by the two may be the same, and the transmission signal received by the end node may be an enhanced transmission signal (such as received signal strength enhancement) superimposed by the two, at least one of the two may enhance the transmission signal that can be received by the end node, compared with the transmission signal sent by the central node when operating at the first timing; the transmission signal updated after synchronization may be completely the same as the transmission signal sent by the central node during the first timing operation, or may be different from the transmission signal updated after synchronization, for example, the power of the transmission signal updated after synchronization may be larger.
For the judgment before using the proxy node, specifically, if the positive feedback information of the end node response is received before the first timing is ended, and the communication is judged to be successful, the communication process with the end node is ended.
If the result of obtaining the unsuccessful communication is returned before the end of the first timing, notifying the network node having the route with the end node as a proxy node of the end node, including:
if the negative feedback information responded by the end node is received before the first timing is finished, and the communication is judged to be failed, informing that a network node with a route with the end node is taken as a proxy node of the end node;
and if the positive feedback information or the negative feedback information responded by the end node is not received before the first timing is ended, judging that the response frame information of the end node is negative feedback information and judging that the communication fails, and informing a network node which has a route with the end node and is used as a proxy node of the end node after the first timing is ended.
The central node may locally store a routing table, and specifically, before the network node notifying that there is a route with the end node is used as a proxy node of the end node, the method further includes:
inquiring the adjacent node information corresponding to the end node according to the stored routing table;
and selecting the network node with the route with the tail end node according to the adjacent node information.
Further, the agent node may be selected through an agent node candidate set, where the agent node candidate set may be a set of agent nodes selected by the central node, and is defined as an agent node candidate set, and the number of the agent node candidate set and the number of the agent nodes in the agent node candidate set are not particularly limited, for example, the minimum number may be 1,2, 3, and the like.
Specifically, after selecting the network node having the route with the end node according to the neighbor node information, and before notifying that the network node having the route with the end node is used as the proxy node of the end node, the method further includes:
taking the network node as a candidate agent node, and forming an agent node candidate set through the candidate agent node;
according to a network topology structure and the routing table, obtaining the proxy node sequence in the proxy node candidate set;
and sequentially selecting a predefined number of agent nodes according to the sequence of the agent nodes, wherein the predefined number of agent nodes are used for notification operation.
Further, the selecting a predefined number of proxy nodes may be made to be optimal proxy nodes through comparison of communication capabilities, and specifically, the obtaining a proxy node ranking in the proxy node candidate set according to the network topology and the routing table includes:
forming a proxy node default ordering in the proxy node candidate set according to a network topology structure and the routing table;
comparing the communication capacity of the agent nodes in the agent node candidate set with the communication capacity record of the end node;
and selectively adjusting the sequence corresponding to the proxy nodes in the proxy node candidate set in the default sequence according to the strength information of the communication capacity obtained after comparison.
The default sorting can be sorting through characteristics such as network topology structure and delay and/or packet loss rate among network nodes in the routing table; the communication capacity records may be field strength information records, received signal to interference plus noise ratio information records, historical success rate information records, power supply capacity records of nodes, calculation capacity records and the like which are reported historically, for comparison, processing analysis can be completed locally in advance, total scores of all the communication capacity records under weight distribution can be compared, or single records respectively correspond to a ratio, for example, if the received signal to interference plus noise ratio in the received signal to interference plus noise ratio information record of one agent node is higher than the received signal to interference plus noise ratio in the received signal to interference plus noise ratio information record of another agent node, the communication capacity of the former can be called to be stronger than the communication capacity of the latter, the communication capacity can have sorting weight, and by analogy in turn, the strength information of all the agent nodes can be finally obtained, the agent node with the strongest communication capacity can be arranged at the first selected position (for example, the sorting sequence number is 0 and the like), the other proxy nodes may be sequentially ordered (the sequence number is greater than 0), and therefore, for the selected predefined number of proxy nodes, specifically, after the predefined number of proxy nodes is sequentially selected, and until the network node notifying that the end node has a route is taken as the proxy node of the end node, the method includes:
generating an optimal proxy node set by the predefined number of proxy nodes;
notifying each proxy node in the optimal set of proxy nodes to be a proxy node for the end node.
After the optimal proxy node set is generated, communication resource allocation information may be notified, specifically, communication resource allocation information corresponding to the end node is provided, and the communication resource allocation information is notified to the proxy node of the end node;
superimposing a random phase different from the proxy node of the end node.
At this time, the opposite end node may receive the transmission signals from the central node and the proxy node, and may perform signal frame alignment when transmitting, specifically, the central node may combine with the proxy node of the end node, respectively transmit the transmission signal updated after synchronization and the synchronized transmission signal to the end node at the same time, and start the second timing.
Further, said ending, by receiving or not receiving the response frame information of the end node, the communication procedure with the end node selectively earliest before the end of the second timing, comprises:
if the positive feedback information responded by the end node is received before the second timing is finished, and the communication is judged to be successful, the communication process with the end node is finished, and the agent node of the end node is released;
if the negative feedback information responded by the end node is received before the second timing is finished, and the communication is judged to be failed, releasing the proxy node of the end node, reselecting the network node with the route of the end node, informing the reselected network node to be used as the current proxy node of the end node, reselecting the proxy node in the current optimal proxy node set, and jumping to the step of executing and selecting the proxy node in the optimal proxy node set again, wherein the step can be configured with multiple jumps;
and if the negative feedback information responded by the end node is received or the positive feedback information or the negative feedback information responded by the end node is not received before the second timing of the last time is finished, and the reselected operation times reach the preset maximum times, judging that the response frame information of the end node is the negative feedback information and judging that the communication is failed, finishing the communication process with the end node, and releasing the proxy node of the end node.
Example 2
The embodiment of the present invention is the same inventive concept as embodiment 1, and provides a method for enhancing a self-organizing network coverage, which takes a case that a central node sends service data to an end node, and according to a specific application situation, the method is also applicable to a case that the end node sends the service data to the central node.
S1), firstly, the central node has service data to be sent to the end node, the service data conforms to the processing flow and format appointed by the system, information to be sent is generated and sent out on the allocated resources (time, frequency, power and the like), and simultaneously, an internal timer is started;
s2) if the positive feedback information (ACK) fed back by the end node is received before the timer is overtime, the communication process is ended; if the timer is over time or negative feedback information (NACK) fed back by the end node is received before the timer is over time, then go to the process S3;
s3) selecting the agent nodes by the central node and generating an optimal agent node set:
s301) the central node inquires the adjacent node information of the end node to be communicated according to a locally stored routing table, and a network node capable of establishing a route with the end node generates a proxy node candidate set;
s302) screening the agent node candidate set according to the following optimal routing criteria, wherein the optimal routing criteria are defined as follows:
optimal routing: and the central node sorts the candidate proxy nodes in the proxy node candidate set according to the communication capacity with the end node according to the network topology structure and the routing table information, and selects N (N is 1,2 … …) proxy nodes with strong communication capacity to add into the optimal proxy node set.
The communication capacity can be based on the field intensity information reported historically, the received signal-to-interference-and-noise ratio information, the historical success rate information, the power supply of the node, the calculation capacity and the like.
S303) the central node generates an optimal agent node set and informs the agent nodes.
S4) the central node communicates with the optimal proxy node set and completes synchronization:
s401) the central node sends service data to be sent and information data format requirements (such as modulation mode, channel coding and the like) to an optimal agent node set;
s402) the central node allocates resources (time slot, frequency, power and the like) for communicating with the end nodes and informs the optimal agent node set of the resource allocation information;
s5) the central node and each agent node (which can have a timing sending function) of the optimal agent node set are respectively superposed with different random phases, then the data sending to the end node is jointly completed at the same time distributed by the central node, and simultaneously the central node starts an internal timer;
s6) if the positive feedback information (ACK) fed back by the end node is received before the timer is overtime, ending the communication process and releasing the agent node;
s7) if the timer is over time or negative feedback information (NACK) fed back by the end node is received before the timer is over time, then go to the flow S3);
s8) repeating the above steps until the maximum number of times is reached.
Example 3
The embodiment of the invention belongs to the same inventive concept as the embodiments 1 and 2, and the embodiment of the invention provides a system for enhancing the coverage of a self-organizing network, which comprises the following steps:
the central node sending module is used for sending a transmission signal to the end node and starting first timing;
a central node selection module for ending the communication process with the end node if the end node determines that the communication is successful by the response frame information of the end node before the first timing is ended,
if the result that the communication success is not obtained is returned before the first timing is finished, informing that the network node which has the route with the end node is taken as the proxy node of the end node;
a central node synchronization module, configured to synchronize the transmission signal to the agent node of the end node, and then combine the agent node of the end node to send a transmission signal updated after synchronization and a synchronized transmission signal to the end node, respectively, and start a second timing;
and the central node judging module is used for selecting the received or not received response frame information of the end node to finish the communication process with the end node earliest before the second timing is finished.
The central node selection module is specifically configured to, if the positive feedback information of the end node response is received before the first timing is ended, determine that the communication is successful, and then end the communication process with the end node.
The central node selection module is specifically configured to:
if the negative feedback information responded by the end node is received before the first timing is finished, and the communication is judged to be failed, informing that a network node with a route with the end node is taken as a proxy node of the end node;
and if the positive feedback information or the negative feedback information responded by the end node is not received before the first timing is ended, judging that the response frame information of the end node is negative feedback information and judging that the communication fails, and informing a network node which has a route with the end node and is used as a proxy node of the end node after the first timing is ended.
The central node selection module is specifically configured to, before the network node notifying that there is a route with the end node is taken as a proxy node for the end node,
inquiring the adjacent node information corresponding to the end node according to the stored routing table;
and selecting the network node with the route with the tail end node according to the adjacent node information.
The central node selection module is specifically configured to, after selecting the network node having the route with the end node according to the neighbor node information and before notifying that the network node having the route with the end node is used as a proxy node of the end node,
taking the network node as a candidate agent node, and forming an agent node candidate set through the candidate agent node;
according to a network topology structure and the routing table, obtaining the proxy node sequence in the proxy node candidate set;
selecting a predefined number of agent nodes in sequence according to the order of the agent nodes, wherein,
the predefined number of proxy nodes is used for notification operations.
The central node selection module is specifically configured to form a default ordering of the proxy nodes in the proxy node candidate set according to a network topology and the routing table;
comparing the communication capacity of the agent nodes in the agent node candidate set with the communication capacity record of the end node;
and selectively adjusting the sequence corresponding to the proxy nodes in the proxy node candidate set in the default sequence according to the strength information of the communication capacity obtained after comparison.
The central node selection module is specifically configured to, after the selecting of the predefined number of proxy nodes in sequence and until the network node notifying that the end node has a route is taken as a proxy node of the end node,
generating an optimal proxy node set by the predefined number of proxy nodes;
notifying each proxy node in the optimal set of proxy nodes to be a proxy node for the end node.
The central node synchronization module is specifically configured to, after the synchronization of the transmission signal to the agent node of the end node, and before the agent node associated with the end node sends the updated transmission signal after synchronization and the synchronized transmission signal to the end node, respectively, and starts a second timing,
providing communication resource allocation information corresponding to the end node, and notifying the communication resource allocation information to a proxy node of the end node;
superimposing a random phase different from the proxy node of the end node.
The central node synchronization module is specifically configured to combine the proxy nodes of the end nodes, send the synchronized updated transmission signal and the synchronized transmission signal to the end nodes at the same time, and start the second timing.
The central node judgment module is specifically configured to, if the positive feedback information of the end node response is received before the second timing is ended, judge that the communication is successful, end the communication process with the end node, and release the proxy node of the end node;
if the negative feedback information responded by the end node is received before the second timing is finished, and the communication is judged to be failed, releasing the proxy node of the end node, reselecting the network node with the route of the end node, and informing the reselected network node of being used as the current proxy node of the end node;
and if the negative feedback information responded by the end node is received or the positive feedback information or the negative feedback information responded by the end node is not received before the second timing of the last time is finished, and the reselected operation times reach the preset maximum times, judging that the response frame information of the end node is the negative feedback information and judging that the communication is failed, finishing the communication process with the end node, and releasing the proxy node of the end node.
The system further comprises: the agent node receiving module is used for receiving the notice of the agent node serving as the end node executed by the central node selecting module and the transmission signal synchronized by the central node synchronizing module;
the system further comprises: and the agent node sending module is used for combining the central node to respectively send the synchronized transmission signal (of the agent node) and the transmission signal updated after synchronization of the central node to the end node.
The system further comprises: an end node receiving module, configured to receive the transmission signal sent by the central node sending module, or,
receiving a transmission signal which is updated after synchronization and sent by the central node through the central node synchronization module and/or a synchronized transmission signal sent by the agent node sending module;
the system further comprises: and the terminal node response module is used for responding to any received transmission signal and sending positive feedback information or negative feedback information to the central node.
Example 4
The embodiment of the present invention belongs to the same inventive concept as embodiments 1 to 3, and provides a communication network device, including:
a computing device having a function of executing an instruction corresponding to the method according to any one of embodiments 1 to 2, and configured to serve as the aforementioned central node, proxy node, or end node.
In a traditional scheme, a central node establishes a communication mode with an end node, the central node directly sends information to be sent to the end node or forwards the information to be sent to the end node through a relay node, only one node keeps communication (the central node or the relay node) at any time from the angle of the end node, the central node does not receive positive feedback information (ACK) of the end node within appointed time (generally, a timer), and the central node can decide whether to retransmit the information.
In the invention, a central node sends information to be sent to a terminal node (directly or through relay node forwarding), if no positive feedback information (ACK) of the terminal node is received in appointed time (generally adopting a timer), the central node generates a proxy node candidate set according to a network topology structure, routing information and a certain criterion and selects an optimal proxy node set; the central node synchronizes information to be sent, information data formats (such as modulation mode, channel coding and the like), resources (time slots, frequencies and the like) required by the information sending and the like with the agent node set; the central node and the agent node set jointly complete data transmission to the end node, and the central node starts an internal timer; if no positive feedback information (ACK) is received from the end node within the agreed time, the above process is repeated until the maximum number of times is reached. The maximum number of times is set according to the resources of the system and the amount of users, and preferably 2 to 4.
The invention provides a method for a central node to jointly send information to a terminal node by selecting an optimal agent node set; the invention provides a criterion for selecting an optimal routing agent node by a central node, and the criterion is based on communication capacities such as an optimal received signal-to-interference-and-noise ratio, a maximum received field intensity, a historical success rate and the like; the invention provides a mode that a central node and a proxy node set are sent at the same distributed moment.
The system has low complexity and obvious coverage enhancement effect, an independent signal propagation path is constructed through each optimal proxy node, signal combination is realized at a terminal node, and the signal-to-noise ratio of a received signal is improved; the system has small interference, the agent nodes complete the communication with the end nodes through the cooperation of the central node, the efficiency is high, and the power utilization rate is high; the invention can greatly improve the transmission reliability of small concurrent control services.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Those skilled in the art will understand that all or part of the steps in the method according to the above embodiments may be implemented by a program, which is stored in a storage medium and includes several instructions to enable a single chip, a chip, or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (15)
1. A method for ad hoc network coverage enhancement, the method comprising:
transmitting a transmission signal to an end node and starting a first timing;
if the communication is determined to be successful by the response frame information of the end node before the first timing is finished, the communication process with the end node is finished,
if the result that the communication success is not obtained is returned before the first timing is finished, informing that the network node which has the route with the end node is taken as the proxy node of the end node;
synchronizing the transmission signal to the agent node of the end node, then combining the agent node of the end node to respectively send the updated transmission signal after synchronization and the synchronized transmission signal to the end node, and starting a second timing;
ending the communication process with the end node selectively earliest before the end of the second timing by receiving or not receiving the response frame information of the end node.
2. The method of coverage enhancement for an ad hoc network according to claim 1, wherein if it is determined from the response frame information of the end node that the communication is successful before the end of the first timing, ending the communication procedure with the end node comprises:
and if the positive feedback information responded by the end node is received before the first timing is finished, and the communication is judged to be successful, the communication process with the end node is finished.
3. The method of enhancing coverage of an ad hoc network according to claim 2, wherein if a result of unsuccessful communication is returned before the end of the first timing, notifying a network node having a route with the end node as a proxy node of the end node comprises:
if the negative feedback information responded by the end node is received before the first timing is finished, and the communication is judged to be failed, informing that a network node with a route with the end node is taken as a proxy node of the end node;
and if the positive feedback information or the negative feedback information responded by the end node is not received before the first timing is ended, judging that the response frame information of the end node is negative feedback information and judging that the communication fails, and informing a network node which has a route with the end node and is used as a proxy node of the end node after the first timing is ended.
4. The method of ad hoc network coverage enhancement according to claim 3, further comprising, before said notifying that the network node having a route with said end node is acting as a proxy node for said end node:
inquiring the adjacent node information corresponding to the end node according to the stored routing table;
and selecting the network node with the route with the tail end node according to the adjacent node information.
5. The method of enhancing self-organizing network coverage according to claim 4, further comprising, after the selecting the network node having the route with the end node according to the neighbor node information and before the notifying the network node having the route with the end node is taken as a proxy node of the end node:
taking the network node as a candidate agent node, and forming an agent node candidate set through the candidate agent node;
according to a network topology structure and the routing table, obtaining the proxy node sequence in the proxy node candidate set;
and sequentially selecting a predefined number of agent nodes according to the sequence of the agent nodes, wherein the predefined number of agent nodes are used for notification operation.
6. The method of enhancing self-organizing network coverage according to claim 5, wherein the obtaining the rank of the proxy nodes in the candidate set of proxy nodes according to the network topology and the routing table comprises:
forming a proxy node default ordering in the proxy node candidate set according to a network topology structure and the routing table;
comparing the communication capacity of the agent nodes in the agent node candidate set with the communication capacity record of the end node;
and selectively adjusting the sequence corresponding to the proxy nodes in the proxy node candidate set in the default sequence according to the strength information of the communication capacity obtained after comparison.
7. The method of enhancing coverage in an ad hoc network of claim 6, wherein after said sequentially selecting a predefined number of proxy nodes and by the time said notifying that a network node having a route with said end node is a proxy node of said end node, comprising:
generating an optimal proxy node set by the predefined number of proxy nodes;
notifying each proxy node in the optimal set of proxy nodes to be a proxy node for the end node.
8. The method of any of claims 1 to 7, further comprising, after the synchronizing the transmission signals to the end node's proxy node and before the end node's proxy node in conjunction with the end node sends the end node a transmission signal updated after synchronization and a transmission signal synchronized after synchronization, respectively, and starts a second timing:
providing communication resource allocation information corresponding to the end node, and notifying the communication resource allocation information to a proxy node of the end node;
superimposing a random phase different from the proxy node of the end node.
9. The method according to claim 8, wherein the proxy node associated with the end node sends the updated transmission signal after synchronization and the synchronized transmission signal to the end node, respectively, and starts a second timing, specifically:
and combining the proxy nodes of the end nodes, respectively sending the updated transmission signals after synchronization and the synchronized transmission signals to the end nodes at the same time, and starting second timing.
10. The method of coverage enhancement for an ad hoc network according to claim 9, wherein said ending of the communication process with the end node by the received or non-received response frame information of the end node, optionally earliest before the end of the second timing, comprises:
if the positive feedback information responded by the end node is received before the second timing is finished, and the communication is judged to be successful, the communication process with the end node is finished, and the agent node of the end node is released;
if the negative feedback information responded by the end node is received before the second timing is finished, and the communication is judged to be failed, releasing the proxy node of the end node, reselecting the network node with the route of the end node, and informing the reselected network node of being used as the current proxy node of the end node;
and if the negative feedback information responded by the end node is received or the positive feedback information or the negative feedback information responded by the end node is not received before the second timing of the last time is finished, and the reselected operation times reach the preset maximum times, judging that the response frame information of the end node is the negative feedback information and judging that the communication is failed, finishing the communication process with the end node, and releasing the proxy node of the end node.
11. A method for ad hoc network coverage enhancement, the method comprising:
receiving a notification and synchronized transmission signal of a proxy node as an end node performed by a central node by the method of any one of claims 1 to 10;
and combining the central node to respectively send the synchronized transmission signal and the transmission signal updated after the synchronization of the central node to the end node.
12. A method for ad hoc network coverage enhancement, the method comprising:
receiving a transmission signal transmitted by a central node by the method of any one of claims 1 to 10, or,
receiving a transmission signal which is updated after synchronization and transmitted by the central node through the method of any one of claims 1 to 10 and/or a transmission signal which is synchronized and transmitted by the proxy node through the method of claim 11;
and sending positive feedback information or negative feedback information to the central node in response to any received transmission signal.
13. A system for ad hoc network coverage enhancement, the system comprising:
the central node sending module is used for sending a transmission signal to the end node and starting first timing;
a central node selection module for ending the communication process with the end node if the end node determines that the communication is successful by the response frame information of the end node before the first timing is ended,
if the result that the communication success is not obtained is returned before the first timing is finished, informing that the network node which has the route with the end node is taken as the proxy node of the end node;
a central node synchronization module, configured to synchronize the transmission signal to the agent node of the end node, and then combine the agent node of the end node to send a transmission signal updated after synchronization and a synchronized transmission signal to the end node, respectively, and start a second timing;
and the central node judging module is used for selecting the received or not received response frame information of the end node to finish the communication process with the end node earliest before the second timing is finished.
14. An electronic device, comprising:
at least one processor;
a memory coupled to the at least one processor;
wherein the memory stores instructions executable by the at least one processor, the at least one processor implementing the method of any one of claims 1 to 12 by executing the instructions stored by the memory.
15. A computer readable storage medium storing computer instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1 to 12.
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