CN108337701B - Transmission path switching method - Google Patents
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- CN108337701B CN108337701B CN201710043171.6A CN201710043171A CN108337701B CN 108337701 B CN108337701 B CN 108337701B CN 201710043171 A CN201710043171 A CN 201710043171A CN 108337701 B CN108337701 B CN 108337701B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/12—Communication route or path selection, e.g. power-based or shortest path routing based on transmission quality or channel quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W36/08—Reselecting an access point
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Abstract
The application provides a transmission path switching method, which comprises the following steps: when a base station receives a path switching request sent by a transmission node, determining whether an alternative switching path capable of completing channel measurement exists in the effective switching time when determining that the alternative switching path exists according to the position information and the state information of the nodes in the network topology; if the alternative switching path can be used for completing the channel measurement within the effective switching time, selecting a predicted optimal alternative switching path from the alternative switching paths, allocating resources to indicate the optimal alternative switching path to perform channel measurement, updating the optimal alternative switching path according to the measurement result, performing channel measurement until the optimal alternative switching path is determined, and sending the optimal alternative switching path to the source node of the transmission path to perform path switching. The problem of redundant information transmission or transmission collision caused by searching for the switching path is effectively solved, and the optimal switching path can be quickly and efficiently searched.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a transmission path switching method.
Background
In a wireless network, due to the mobility of nodes and a dynamically changing channel environment, a multi-hop transmission path between two devices may be switched according to a change in a transmission environment. The existing transmission path switching is divided into the following two mechanisms:
path reselection: when the destination node/source node detects that the received data is interrupted, or the relay node of the transmission path detects that the link is interrupted or does not meet the transmission requirement, a path reselection process is initiated, that is, the source node needs to initiate a new routing process to select a new transmission path reaching the destination node, or select an alternative path stored locally for data transmission.
Local repair: when the relay node of the transmission path detects that the local link is interrupted or the transmission requirement is not met, a path repair request is sent to the adjacent node, the adjacent node forwards the request information until the node with the transmission path to the destination node receives the request, the node replies repair confirmation information, after the interrupted routing node receives the repair confirmation information, the repair path can be selected according to a certain path selection criterion, and the interrupted link is switched to the repair path to continue the data transmission to the destination node. The interruption of local repair is proposed mainly to reduce the overhead introduced by path reselection.
Disclosure of Invention
In view of the above, the present application provides a transmission path switching method to reduce the problem of redundant information transmission or transmission collision caused by searching for a switching path.
In order to solve the technical problem, the technical scheme of the application is realized as follows:
a transmission path switching method, the method comprising:
when detecting that the transmission path is interrupted or has been interrupted, the transmission node sends a path switching request to the base station, and the switching request carries effective switching time;
when a base station receives a path switching request sent by a transmission node, determining whether an alternative switching path exists according to the position information and the state information of the node in the network topology;
when determining that the alternative switching path exists, determining whether the alternative switching path capable of completing channel measurement exists within the effective time of switching;
when determining that alternative switching paths capable of completing channel measurement exist in the effective switching time, selecting a predicted optimal alternative switching path from the alternative switching paths, and allocating resources to indicate the optimal alternative switching path to perform channel measurement;
the base station updates the optimal alternative switching path according to the measurement result and allocates resources to indicate the path to carry out channel measurement until the optimal alternative switching path is determined and the optimal alternative switching path is sent to the source node of the transmission path;
and when the source node receives the switching path sent by the base station, the path switching is carried out.
According to the technical scheme, the optimal switching transmission path is found for the communication between the source node and the destination node within the set effective time of switching through the state measurement of the link channel between the target initiating device and the device of the base station, so that the problem of redundant information transmission or transmission collision caused by searching the switching path is effectively solved, and the optimal switching path can be quickly and efficiently found.
Drawings
Referring to fig. 1, fig. 1 is a schematic diagram of a transmission path switching process in the embodiment of the present application;
fig. 2 is a schematic diagram of an application scenario of multi-hop communication path switching of a base station auxiliary device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings and examples.
The application provides a transmission path switching method, which finds the optimal switching transmission path for the communication between a source node and a destination node within the set effective time of switching through the state measurement of a link channel between a target initiating device and a device of a base station, effectively reduces the problem of redundant information transmission or transmission collision caused by finding the switching path, and can quickly and efficiently find the optimal switching path.
The following describes a transmission path switching process in the embodiment of the present application in detail with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic diagram of a transmission path switching process in the embodiment of the present application. The method comprises the following specific steps:
The effective time of switching is configured according to actual needs.
The base station receives the position information and the state information periodically reported by the nodes in the network topology, and the obtained position information and the state information of the nodes, so that the channel quality among the nodes can be estimated, and whether the nodes can be used as candidate relay nodes for assisting other equipment in communication or not can be estimated.
In this step, whether an alternative switching path exists is determined according to the location information and the state information of the nodes in the network topology, and the specific implementation method is as follows:
if the source node and the destination node of the transmission path are the same, the link which is about to be interrupted or is interrupted in the transmission path is not included, and the channel quality of the link except the link which is overlapped with the transmission link in the link is larger than a preset link threshold, determining that an alternative switching path exists; otherwise, determining that no alternative switching path exists.
And when determining that the alternative switching path does not exist, informing the source node that the alternative switching path does not exist, and enabling the source node to wait for the preset time and then initiate a transmission path switching request to the base station again.
And the channel quality of the links except the links which are overlapped with the transmission links in the links is obtained according to the position information of the nodes and the prediction of a large-scale fading model.
The transmission node is a node on the transmission path, and may be a source node, a destination node, or an intermediate node.
In this step, determining whether there is an alternative handover path that can complete channel measurement within the effective time of the handover includes:
if an alternative switching path satisfies the following conditions:
and N.tau is less than or equal to T, determining that the alternative switching path can complete channel measurement in the effective time of the switching; otherwise, determining that the alternative switching path can not complete channel measurement within the effective time of the switching; wherein, M represents the number of links of the channel to be measured for the alternative switching path, N represents the number of times of channel measurement signaling sent by the base station, and QiIndicating base station initiationThe number of links which can perform channel measurement simultaneously and are supported in the ith channel measurement signaling, τ represents the time overhead from the base station initiating the channel measurement signaling for 1 time to receiving the channel measurement feedback result, and T represents the effective time of switching.
If determining that the alternative switching path capable of completing the channel measurement does not exist in the effective switching time, selecting an optimal alternative switching path from the alternative switching paths and performing the channel measurement;
and when the effective switching time is up, selecting an optimal alternative switching path according to the currently obtained measurement result, and feeding back the optimal alternative switching path to the source node.
And step 104, when determining that alternative switching paths capable of completing channel measurement exist in the effective switching time, the base station selects a predicted optimal alternative switching path from the alternative switching paths, and allocates resources to indicate the optimal alternative switching path to perform channel measurement.
The implementation method for selecting the optimal alternative switching path by the base station comprises the following steps:
optimal alternative handover path
Wherein A isjIndicates the number of links, R, included in the alternative handover path jjIndicating the available transmission rate, R, of the alternative handover path jj＝min(Rk,j),k＝1,2,…,Aj，Rk,jRepresents the transmission rate of the k link in the alternative switching path j, which is determined by the channel quality S of the linkk,jDetermining;
when the channel quality of the link is not actually measured and fed back, estimating the channel quality according to the position information of the node and the large-scale fading model to calculate the transmission rate of the corresponding link; and when the channel quality of the link is actually measured and fed back, calculating the transmission rate of the corresponding link according to the feedback result.
In this step, the specific implementation manner of the base station allocating resources to instruct the optimal alternative handover path to perform channel measurement includes:
base station rootThe resources which can be used for the current link to carry out channel measurement and feedback and the selected optimal alternative switching path j0The topology related to selecting the optimal alternative handover path
Each link carries out channel measurement;
base station to SiAnd DiRespectively transmitting channel measurement and feedback signaling, and allocating corresponding channel resources, wherein,
the sending end and the receiving end of the channel measurement signal corresponding to each link are respectively SiAnd Di(i＝1,2,…,
)。
Wherein the base station selects the optimal alternative switching path
Each link performs measurements, including:
according to path j0The number of nodes which can simultaneously transmit channel measurement signals in the link which is not subjected to channel measurement in the optimal alternative path is judged as
Corresponding to
The number of adjacent links for which each node needs to perform channel measurement is
Determining the maximum number of links P capable of supporting simultaneous measurement according to the resources currently available for channel measurement and feedback of the links, then
When in use
When is at
Randomly selecting P links to carry out channel measurement; otherwise, aim at
Each link performs channel measurements.
In a specific implementation, when it is determined that an alternative path exists, the alternative path may be further divided into two sets according to whether channel measurement can be completed within the effective time of handover, for example, the alternative path can be divided into the set a when the channel measurement can be completed, and the alternative path cannot be divided into the set B when the channel measurement cannot be completed, the alternative path in the set a is preferentially measured, the alternative path in the set B is measured when the set is empty, and the set a and the set B are updated according to the measurement result after each measurement is completed.
When the channel measurement is carried out aiming at the alternative switching paths in the set A, the channel measurement is finished until the effective time of the switching is reached or the channel measurement is finished through the measured best alternative switching path;
and when the channel measurement is carried out on the alternative switching paths in the set B until the effective time of the switching is up, selecting the optimal alternative switching path according to the actual measurement result and the prediction result for the links in the alternative switching paths.
And 105, the base station updates the optimal alternative switching path according to the measurement result, allocates resources to indicate the path to perform channel measurement until the optimal alternative switching path is determined, and sends the optimal alternative switching path to the source node of the transmission path.
The base station updates the optimal alternative switching path according to the measurement result and allocates resources to indicate the path to perform channel measurement until the optimal alternative switching path is determined, and the method comprises the following steps:
selecting an optimal switching path from the current alternative paths according to the measurement result, and if the channel measurement is finished by the currently selected optimal alternative switching path, determining the currently selected optimal alternative switching path as the optimal alternative switching path fed back to the source node;
otherwise, selecting the optimal alternative switching path again, and performing channel measurement on the optimal alternative switching path until the selected optimal path completes channel measurement or the effective switching time is up, and taking the currently determined optimal alternative switching path as the optimal alternative switching path fed back to the source node.
And 106, when the source node receives the switching path sent by the base station, switching the path.
In the embodiment of the present application, a multi-hop communication scenario among devices under the coverage of a cellular network is taken as an example. Referring to fig. 2, fig. 2 is a schematic diagram of an application scenario of multi-hop communication path switching of a base station auxiliary device.
In fig. 2, when a transmission path (a path shown by a dotted line in the figure) between a source node and a destination node is interrupted, taking an example that a transmission node a (any node on the transmission path) detects that a transmission link is interrupted, a path switching request is sent to a base station, and effective switching time is carried.
When receiving the request, the base station determines whether an alternative path exists according to the position information and the state information of the nodes in the network topology, determines the existing alternative switching path, such as an alternative switching path corresponding to the solid link in fig. 2, selects an optimal alternative switching path, such as a path L, according to the processing principle provided by the application, and sends the relevant information of the path L to the source node, so that the source node performs path switching.
In summary, according to the method and the device for switching the transmission path, the base station purposefully measures the channel state of the link between the initiating device and the device, and finds the optimal switching transmission path for the communication between the source node and the destination node within the set effective time of switching, so that the problem of redundant information transmission or transmission collision caused by finding the switching path is effectively reduced, and the optimal switching path can be quickly and efficiently found.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A transmission path switching method, comprising:
when detecting that the transmission path is interrupted or has been interrupted, the transmission node sends a path switching request to the base station, and the switching request carries effective switching time;
when a base station receives a path switching request sent by a transmission node, determining whether an alternative switching path exists according to the position information and the state information of the node in the network topology;
when determining that the alternative switching path exists, determining whether the alternative switching path capable of completing channel measurement exists within the effective time of switching;
when determining that alternative switching paths capable of completing channel measurement exist in the effective switching time, selecting a predicted optimal alternative switching path from the alternative switching paths, and allocating resources to indicate the optimal alternative switching path to perform channel measurement;
the base station updates the optimal alternative switching path according to the measurement result and allocates resources to indicate the path to carry out channel measurement until the optimal alternative switching path is determined and the optimal alternative switching path is sent to the source node of the transmission path;
when the source node receives a switching path sent by a base station, path switching is carried out;
wherein, the determining whether the alternative switching path exists according to the position information and the state information of the nodes in the network topology includes:
if a path which is the same as the source node and the destination node of the transmission path, does not contain a link which is about to be interrupted or is interrupted in the transmission path, and the channel quality of links except the link which is overlapped with the transmission path is larger than a preset link threshold exists, determining that an alternative switching path exists; otherwise, determining that no alternative switching path exists;
the base station updates the optimal alternative switching path according to the measurement result and allocates resources to indicate the path to perform channel measurement until the optimal alternative switching path is determined, and the method comprises the following steps:
if the currently selected optimal alternative switching path has finished channel measurement, determining the currently selected optimal alternative switching path as the optimal alternative switching path fed back to the source node;
otherwise, selecting the optimal alternative switching path again, and performing channel measurement on the optimal alternative switching path until the selected optimal path completes channel measurement or the effective switching time is up, and taking the currently determined optimal alternative switching path as the optimal alternative switching path fed back to the source node.
2. The method of claim 1, wherein the determining whether there is an alternative handover path that can complete channel measurement within the validity time of the handover comprises:
if an alternative switching path satisfies the following conditions:
and N.tau is less than or equal to T, determining that the alternative switching path can complete channel measurement in the effective time of the switching; otherwise, determining that the alternative switching path can not complete channel measurement within the effective time of the switching; wherein, M represents the number of links of the channel to be measured for the alternative switching path, N represents the number of times of channel measurement signaling sent by the base station, and QiThe number of links which can be simultaneously measured and are supported in the ith channel measurement signaling initiated by the base station is represented, tau represents the time overhead from the initiation of the channel measurement signaling of 1 time by the base station to the reception of the channel measurement feedback result, and T represents the effective time of switching.
3. The method of claim 1, wherein selecting the optimal candidate handover path comprises:
optimal alternative handover path
Wherein A isjIndicates the number of links, R, included in the alternative handover path jjIndicating the available transmission rate, R, of the alternative handover path jj＝min(Rk,j),k＝1,2,…,Aj，Rk,jRepresents the transmission rate of the k link in the alternative switching path j, which is determined by the channel quality S of the linkk,jDetermining;
when the channel quality of the link is not actually measured and fed back, estimating the channel quality according to the position information of the node and the large-scale fading model to calculate the transmission rate of the corresponding link; and when the channel quality of the link is actually measured and fed back, calculating the transmission rate of the corresponding link according to the feedback result.
4. The method of claim 1, wherein the allocating the resource to instruct the optimal alternative handover path to perform channel measurement comprises:
according to the resources which can be used for the current link to carry out channel measurement and feedback, and the selected optimal alternative switching path j0The topology related to selecting the optimal alternative handover path
Each link carries out channel measurement;
to SiAnd DiRespectively transmitting channel measurement and feedback signaling, and allocating corresponding channel resources, wherein,
the sending end and the receiving end of the channel measurement signal corresponding to each link are respectively SiAnd Di，
5. The method of claim 4, wherein the selecting the maximum is based on a predetermined rulePreferred alternative handover path dependent
Each link performs measurements, including:
according to path j0The number of nodes which can simultaneously transmit channel measurement signals in the link which is not subjected to channel measurement in the optimal alternative path is judged as
Corresponding to
The number of adjacent links for which each node needs to perform channel measurement is
Determining the maximum number of links P capable of supporting simultaneous measurement according to the resources currently available for channel measurement and feedback of the links, then
When in use
When is at
Randomly selecting P links to carry out channel measurement; otherwise, aim at
Each link performs channel measurements.
6. The method of claim 1, further comprising:
if the alternative switching path capable of completing the channel measurement does not exist in the effective switching time, selecting the optimal alternative switching path from the alternative switching paths and carrying out the channel measurement;
and when the effective switching time is up, selecting an optimal alternative switching path according to the currently obtained measurement result, and feeding back the optimal alternative switching path to the source node.
7. The method according to any one of claims 1-6, characterized in that the method further comprises:
and when determining that the alternative switching path does not exist, informing the source node that the alternative switching path does not exist, and enabling the source node to wait for the preset time and then initiate a transmission path switching request to the base station again.
8. The method according to any one of claims 1-6, characterized in that the method further comprises:
the base station receives the position information and the state information periodically reported by the nodes in the network topology, and the obtained position information and the state information of the nodes.
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| CN110636561B (en) * | 2018-06-21 | 2022-11-08 | 中兴通讯股份有限公司 | Information transmission method and device, storage medium and electronic device |
| CN111565424B (en) * | 2019-02-14 | 2021-03-16 | 电信科学技术研究院有限公司 | Method, device and storage medium for processing connection failure in dual-connection system |
| CN113038566B (en) * | 2019-12-25 | 2023-04-25 | 维沃移动通信有限公司 | Path selection method, terminal and network equipment |
| CN111555971A (en) * | 2020-04-26 | 2020-08-18 | 新分享科技服务(深圳)有限公司 | Information distribution platform, system and information distribution method |
| CN112134763B (en) * | 2020-09-25 | 2022-08-02 | 北京浪潮数据技术有限公司 | Method, system, equipment and medium for transmitting layered messages among cluster nodes |
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