CN109429294B - Communication method, base station, relay node and device with storage performance - Google Patents
Communication method, base station, relay node and device with storage performance Download PDFInfo
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- 238000004891 communication Methods 0.000 title claims abstract description 192
- 238000000034 method Methods 0.000 title claims abstract description 68
- 230000005540 biological transmission Effects 0.000 claims description 17
- 238000012545 processing Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 13
- 238000012790 confirmation Methods 0.000 claims description 7
- 230000004044 response Effects 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 claims 2
- 239000002699 waste material Substances 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 10
- 238000012216 screening Methods 0.000 description 8
- 230000006870 function Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000013468 resource allocation Methods 0.000 description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
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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
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
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Abstract
The invention discloses a communication method, a base station, a relay node and a device with storage performance, wherein the communication method comprises the following steps: a base station receives communication condition information transmitted from at least one relay node; the base station selects the backhaul link path matching the communication condition information among a selectable set of backhaul link paths; and the base station sends the selected backhaul link path to a relay node to be adopted by the relay node. Through the mode, the invention can dynamically select the proper return link path, so that the relay node transmits the service according to the selected return link path, the use efficiency of resources is improved, and the waste of resources is reduced.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a communication method, a base station, a relay node, and a device with storage capability.
Background
In a 5G communication network, backhaul link connection must be able to support mobile services of each cell, and since the cells are very densely distributed, the cost of using wired backhaul links is too high, and the problem can be effectively solved using wireless self-backhaul links.
The self-backhaul link defines that the access link and the backhaul link share the same frequency resource, and when the access link and the backhaul link are close to or coincide with each other, interference may be caused to the services transmitted by each other, which may affect the quality of communication.
Disclosure of Invention
The invention mainly aims to provide a communication method which can improve the communication quality of a self-backhaul link.
In order to achieve the purpose, the invention adopts a technical scheme that: there is provided a communication method including: the base station receives communication condition information sent by at least one relay node; the base station selects the backhaul link path matching the communication condition information among a selectable set of backhaul link paths; and the base station sends the selected backhaul link path to a relay node to be adopted by the relay node.
In order to achieve the purpose, the invention adopts another technical scheme that: there is provided a communication method including: transmitting communication condition information to a base station; the backhaul link path selected and transmitted by the base station is received and employed.
In order to achieve the purpose, the invention adopts another technical scheme that: there is provided a base station comprising first processing circuitry and first communication circuitry electrically coupled to each other, the predetermined processing circuitry being operable to execute instructions to implement a method as described above.
In order to achieve the purpose, the invention adopts another technical scheme that: there is provided a relay node comprising second processing circuitry and second communication circuitry electrically coupled to each other, the second processing circuitry being operable to execute instructions to implement a method as described above.
In order to achieve the purpose, the invention adopts another technical scheme that: there is provided an apparatus having memory capability storing instructions which, when executed, implement any of the above methods.
The invention has the beneficial effects that: different from the prior art, the base station receives the communication condition information of all the backhaul link paths participating in the relay node, the backhaul link paths matched with the communication condition information are selected according to the communication condition information, and the selected backhaul link paths are notified to the relay node, so that the relay node transmits information services according to the selected backhaul link paths, the appropriate backhaul link paths can be effectively and reasonably selected, the use efficiency of resources is improved, and the communication quality of the self-backhaul links is improved.
Drawings
Fig. 1 is a schematic flow chart of a first embodiment of a communication method provided by the present invention;
fig. 2 is a frequency resource allocation diagram of a relay node provided in the present invention;
fig. 3 is a flowchart illustrating a second embodiment of the communication method provided by the present invention;
fig. 4 is a flowchart illustrating a third embodiment of the communication method provided by the present invention;
fig. 5 is a schematic flow chart of a fourth embodiment of the communication method provided by the present invention;
fig. 6 is a flowchart illustrating a fifth embodiment of the communication method provided by the present invention;
fig. 7 is a flowchart illustrating a sixth embodiment of the communication method provided by the present invention;
fig. 8 is a flowchart illustrating a seventh embodiment of the communication method provided by the present invention;
fig. 9 is a schematic diagram of a connection relationship between a base station and a relay node provided in the present invention;
fig. 10 is a schematic structural diagram of an embodiment of a base station provided in the present invention;
fig. 11 is a schematic structural diagram of an embodiment of a relay node provided in the present invention;
fig. 12 is a schematic structural diagram of an embodiment of an apparatus with storage capability according to 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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a communication method according to a first embodiment of the present invention. The communication method provided by the invention comprises the following steps:
s101: the base station receives the communication condition information transmitted from the at least one relay node.
Please refer to fig. 2, which is a schematic diagram of resource allocation of a relay node for convenience of description. As shown in fig. 2, the resources 10 of the relay node include a control message transmission band 11, a backhaul link dedicated band 12, a shared band 13, and a terminal dedicated band 14. Of course, the resource allocation in other embodiments of the present invention is not limited to that shown in fig. 2, and all embodiments of the present invention are applicable as long as there is an implementation scenario of the shared frequency band 13.
In this implementation scenario, there is no sub-6GHz frequency, and a reliable and stable link is required as a link for exchanging control layer messages, so the control message transmission band 11 is not a band that can be shared by the backhaul link and the access link, but is a dedicated band for transmitting control messages between the base station and the relay node or multiple relay nodes.
The backhaul link dedicated band 12 is only used for the backhaul link, and when the traffic that needs to be transmitted by the backhaul link has a high requirement on the communication quality or is delay sensitive traffic, the backhaul link dedicated band 12 may be used. In this embodiment, the bandwidth of the backhaul link dedicated band 12 is variable, and in other embodiment, the bandwidth 12 of the backhaul link dedicated band may be fixed.
The shared band 13 is a band shared by the backhaul link and the access link, and occupies most of the resources 10 of the relay node. The shared frequency band 13 can be used for transmitting traffic as a backhaul link and also can be used for transmitting traffic as an access link.
The terminal-specific frequency band 14 is a frequency band dedicated to an access link. When the shared frequency band 13 is used as both the backhaul link and the access link to transmit services, it will cause certain interference to the transmitted services, and the base station will determine whether the user terminal needs to use the terminal-dedicated frequency band 14 according to the strength of the interference-carrying capability of the user terminal. For example, the base station may preset a threshold value (e.g., 5 degrees, 10 degrees, etc.) of an included angle between the backhaul link and the access link, and when the included angle between the backhaul link and the access link is within the threshold value, which indicates that mutual interference between the backhaul link and the access link is large, the terminal-dedicated frequency band 14 is enabled.
In a specific implementation scenario, the base station sends a communication condition information detection request to at least one relay node, so that the relay nodes start to detect the communication conditions of all backhaul link paths starting from the relay nodes in response to the communication condition detection request, and send the detected communication condition information to the base station.
Specifically, the communication condition information includes at least one of communication quality of all backhaul link paths starting from the backhaul link, a traffic type to be transmitted, a resource requirement of the backhaul link, and an access link sharing the same frequency band as the backhaul link. In the implementation scenario, the communication quality of all backhaul link paths starting from the backhaul link path is mainly represented by the signal-to-noise ratio of the backhaul link path, which reflects the case of signal interference, and during the test, the maximum SINR value is 30, and the minimum SINR value is even a negative value. Generally speaking, the signal quality is considered to be excellent when the SINR is more than or equal to 25, the signal quality is considered to be good when the SINR is more than 25 and more than 20, the signal quality is considered to be general when the SINR is more than or equal to 20 and more than or equal to 10, and the signal quality is considered to be poor when the SINR is less than 5. In other implementation scenarios, parameters such as reference signal received power, reference signal received quality, and received signal strength may also be used as reference indicators.
In this embodiment, the service type to be transmitted includes at least one of whether the service is a delay sensitive type and a communication quality requirement of the service, and in other implementation scenarios, priorities of different services may also be directly preset. The requirement of communication quality is determined according to whether the service is easily interfered in the transmission process, if the service is easily interfered, the requirement of communication quality is high, and if the service has strong interference carrying capacity or has a certain fault-tolerant space and can accept certain interference, the requirement of communication quality is lower.
In this implementation scenario, the resource requirements of the backhaul link and the access link sharing the same frequency band as the backhaul link include at least one of traffic volume to be transmitted by the backhaul link and the access link and a resource reuse rate of the frequency band shared by the backhaul link and the access link. When a relay node transmits a large amount of services at the same time on the backhaul link and the access link, the resource reuse rate of the shared frequency band of the backhaul link and the access link is high, which means that the probability of interference and delay on the path using the backhaul link is high at the same time.
In another implementation scenario, the base station may receive the communication status information obtained by detecting the communication statuses of all the backhaul link paths with the relay node as a starting point at regular time intervals according to a preset cycle, and transmitting the detected communication status information.
S102: the base station selects the backhaul link path matching the communication condition information among a selectable set of backhaul link paths.
In a specific implementation scenario, a multi-hop technique is supported, i.e. one relay node may transmit traffic to a base station through another relay node or multiple relay nodes. A specific relay node may be configured to transmit traffic to the base station through several relay nodes. Or if no setting is made, the number of the relay nodes connected with the base station is reduced by 1 to form an upper limit. The single hop is that the relay node directly transmits service with the base station.
In this implementation scenario, the base station selects the most appropriate backhaul link path from the set of single-hop and multi-hop backhaul link paths according to the received communication condition information. Specifically, the most suitable backhaul link path is selected for the traffic according to the type of the traffic that needs to be transmitted. If the service needing to be transmitted is a delay sensitive type, the priority of the service is highest, the base station selects a return link path with the highest signal to noise ratio for the service, the lowest traffic quantity of the return link and the access link needing to be transmitted and the lowest resource reuse rate of a shared frequency band of the return link and the access link, if the requirement of the service needing to be transmitted on the communication quality is high, the service has higher priority, the base station selects a return link path with higher signal to noise ratio for the service, the lower traffic quantity of the return link and the access link needing to be transmitted and the lower resource reuse rate of the shared frequency band of the return link and the access link. If the service needing to be transmitted is not a delay sensitive type and has low requirement on communication quality, the base station selects a backhaul link path for other service with high priority and then selects a suitable backhaul link path for the service on the remaining backhaul link path.
Since the present embodiment selects suitable backhaul link paths for different types of services, even if the services are transmitted by the same relay node, the base station may select different backhaul link paths according to different priorities corresponding to different types of the services.
In another implementation scenario, before selecting different backhaul link paths for different services, the base station updates the candidate backhaul link paths according to the communication quality of the backhaul link paths in the received communication condition information. Specifically, the base station presets a screening condition for the communication quality of the backhaul link paths, if the communication quality of one backhaul link path does not meet the preset screening condition, if the backhaul link path is in the original candidate backhaul link path, the backhaul link path is deleted from the candidate backhaul link path, and if the backhaul link path is not in the original candidate backhaul link path, the backhaul link path is ignored. If the communication quality of one backhaul link path meets the preset screening condition, if the backhaul link path is in the original candidate backhaul link path, the backhaul link path is maintained, and if the backhaul link path is not in the original candidate backhaul link path, the backhaul link path is added to the candidate backhaul link path.
In this implementation scenario, the preset screening condition is that the communication signal-to-noise ratio of the backhaul link path is greater than or equal to a preset threshold. In other embodiments, the parameters such as the reference signal received power, the reference signal received quality, and the received signal strength may be greater than a preset threshold. Therefore, the backhaul link path with serious interference caused by the fact that the backhaul link and the access link share the same frequency band cannot be used as the candidate backhaul link path, the number of the backhaul link paths to be selected by the base station can be effectively reduced, and the quality of service transmission is improved.
S103: and the base station sends the selected backhaul link path to a relay node to be adopted by the relay node.
In a specific implementation scenario, after selecting different backhaul link paths for different services, the base station sends the selected backhaul link paths to corresponding relay nodes that need to send the services. After receiving the selected backhaul link paths, the relay node transmits different services through different backhaul link paths according to the selection of the base station.
In other implementation scenarios, in order to reduce the complexity of the scheduling backhaul link path, before the base station sends the selected backhaul link path to the relay node, the relay node is notified to unload at least part of the scheduling subtasks, thereby reducing the workload.
In other implementation scenarios, the candidate backhaul link path is updated according to the communication quality of the backhaul link path in the received communication status information, and it is ensured that the capacity of transmitting the service meets the minimum requirement.
In this implementation scenario, millimeter waves are used as a way to transmit traffic. The millimeter wave has strong anti-interference performance, is suitable for being used in a communication mode of a multilink shared frequency band, has high isolation and good directivity when being transmitted in different links, and supports a multi-hop communication mode. In other implementation scenarios, other electromagnetic waves may also be selected to transmit traffic.
As can be seen from the above description, in this embodiment, the base station receives the communication status information of all backhaul link paths participating in the relay node, selects a backhaul link path matching the communication status information according to the communication status information, and notifies the relay node of the selected backhaul link path, so that the relay node transmits information traffic according to the selected backhaul link path, and can dynamically select an appropriate backhaul link path, thereby improving the utilization efficiency of resources and reducing the waste of resources. Before the base station sends the selected backhaul link path to the relay node, the relay node is informed to unload at least part of the scheduling subtasks, so that the workload can be reduced.
Referring to fig. 3, fig. 3 is a flowchart illustrating a communication method according to a second embodiment of the present invention. The communication method provided by the invention comprises the following steps:
s201: the base station maintains a backhaul link path list of a control layer and broadcasts the list to the relay nodes.
In a specific implementation scenario, transmission of control messages for backhaul links between a base station and a relay node or a plurality of relay nodes is known or slowly changes, so that the base station needs to maintain a backhaul link path list of a control layer and broadcast the backhaul link path list to a plurality of relay nodes wirelessly connected with the base station. The backhaul link path of the control layer refers to a link path through which the base station transmits a message to the relay node. After the base station broadcasts the backhaul link path of the control layer to the relay node, the subsequent control information is sent to the relay node through the backhaul link path.
S202: the base station receives the communication condition information transmitted from the at least one relay node.
S203: the base station selects the backhaul link path matching the communication condition information among a selectable set of backhaul link paths.
S204: and the base station sends the selected backhaul link path to a relay node to be adopted by the relay node.
Steps S202 to S204 are substantially similar to steps S101 to S103 of the second embodiment of the communication method provided by the present invention, and are not described again here.
As can be seen from the above description, in this embodiment, the base station broadcasts the backhaul link path of the control layer to the relay node, so that the relay node can receive the control information sent by the base station according to the fixed link path, thereby improving the reliability of communication.
Referring to fig. 4, fig. 4 is a flowchart illustrating a communication method according to a third embodiment of the present invention. The communication method provided by the invention comprises the following steps:
s301: the base station receives the communication condition information transmitted from the at least one relay node.
S302: the base station selects the backhaul link path matching the communication condition information among a selectable set of backhaul link paths.
S303, the base station selects the backhaul link path which is matched with the communication condition information from the selectable backhaul link path set.
Steps S301 to S303 are substantially similar to steps S101 to S103 of the first embodiment of the communication method provided by the present invention, and are not described again here.
S304: receiving a backhaul link path re-planning request sent by the at least one relay node based on the selected backhaul link path.
In a specific implementation scenario, if the backhaul link path selected by the base station is different from the default backhaul link path of the original relay node, the relay node needs to confirm the new backhaul link path.
S305: transmitting an acknowledgement backhaul link path re-planning message to the at least one relay node.
In a specific implementation scenario, the base station receives a backhaul link path replanning request sent by the relay node based on the selected backhaul link path, confirms a new backhaul link path, and notifies the relay node to transmit a service according to the selected backhaul link path.
As can be seen from the above description, in this embodiment, when the backhaul link path selected by the base station is different from the default backhaul link path, secondary confirmation is performed to ensure the correctness of the selection and avoid error and leakage or delay in service transmission.
Referring to fig. 5, fig. 5 is a flowchart illustrating a communication method according to a fourth embodiment of the present invention. The communication method provided by the invention comprises the following steps:
s401: and transmitting the communication condition information to the base station.
In a specific implementation scenario, the relay node starts to detect the communication statuses of all backhaul link paths starting from itself in response to a communication status detection request sent by the base station based on the reception of the communication status information detection request, and sends the detected communication status information to the base station.
Specifically, after responding to the communication condition detection request, the relay node detects at least one of the communication quality of all backhaul link paths starting from the relay node, the type of traffic to be transmitted, the backhaul link, and the resource requirement of an access link sharing the same frequency band as the backhaul link. And summarizing the detection result into communication condition information and sending the communication condition information to the base station.
In the implementation scenario, the communication quality of all backhaul link paths starting from the backhaul link path is mainly represented by the signal-to-noise ratio of the backhaul link path, which reflects the case of signal interference, and during the test, the maximum SINR value is 30, and the minimum SINR value is even a negative value. Generally speaking, the signal quality is considered to be excellent when the SINR is more than or equal to 25, the signal quality is considered to be good when the SINR is more than 25 and more than 20, the signal quality is considered to be general when the SINR is more than or equal to 20 and more than or equal to 10, and the signal quality is considered to be poor when the SINR is less than 5. In other implementation scenarios, parameters such as reference signal received power, reference signal received quality, and received signal strength may also be used as reference indicators.
In this embodiment, the service type to be transmitted includes at least one of whether the service is a delay sensitive type and a communication quality requirement of the service, and in other implementation scenarios, priorities of different services may also be directly preset. The requirement of communication quality is determined according to whether the service is easily interfered in the transmission process, if the service is easily interfered, the requirement of communication quality is high, and if the service has strong interference carrying capacity or has a certain fault-tolerant space and can accept certain interference, the requirement of communication quality is lower.
In this implementation scenario, the resource requirements of the backhaul link and the access link sharing the same frequency band as the backhaul link include at least one of traffic volume that needs to be transmitted by the backhaul link and the access link connected to the same relay node and a resource reuse rate of the shared frequency band of the backhaul link and the access link. When a relay node transmits a large amount of services at the same time on the backhaul link and the access link, the resource reuse rate of the shared frequency band of the backhaul link and the access link is high, which means that the probability of interference and delay on the path using the backhaul link is high at the same time.
In another implementation scenario, the relay node may detect the communication status of all backhaul link paths starting from itself at regular time intervals according to a preset cycle, and transmit the detected communication status information to the base station.
S402: receiving and adopting the backhaul link path selected and sent by the base station, wherein the backhaul link path can be selected from the backhaul link paths in the backhaul link path set, and the backhaul link path is matched with the communication condition information.
In a specific implementation scenario, the base station selects a matched backhaul link path for different transmission services according to the received communication condition information, and sends the selected backhaul link path to the relay node. The relay node transmits different traffic over the matched backhaul link paths selected by the base station.
As can be seen from the above description, in this embodiment, the relay node sends the communication status information of all backhaul link paths starting from itself to the base station, so that the base station can select a matched backhaul link path according to the communication status information, and transmit traffic according to the backhaul link path selected by the base station, thereby dynamically selecting an appropriate backhaul link path, improving the utilization efficiency of resources, and reducing the waste of resources.
Referring to fig. 6, fig. 6 is a flowchart illustrating a communication method according to a fifth embodiment of the present invention. The communication method provided by the invention comprises the following steps:
s501: receiving a backhaul link path list of a control layer broadcast by the base station.
In a specific implementation scenario, the transmission of control messages for the backhaul links between the base station and the relay node or relay nodes is known or slowly changes, so the base station needs to maintain a backhaul link path list of a control layer, and the relay node receives the backhaul link path list broadcast by the base station. The backhaul link path of the control layer refers to a link path through which the base station transmits a message to the relay node. After the relay node receives the backhaul link path of the control layer broadcasted by the base station, the control information sent by the base station will be received through the backhaul link path.
S502: and transmitting the communication condition information to the base station.
And S503, receiving and adopting the backhaul link path selected and sent by the base station, wherein the backhaul link path can be selected from the backhaul link paths matched with the communication condition information in the backhaul link path set.
Steps S502 to S503 are substantially similar to steps S401 to S402 of the fourth embodiment of the communication method provided by the present invention, and are not described again here.
As can be seen from the above description, in the present embodiment, the control information sent by the base station is received according to the fixed link path, so as to improve the reliability of communication, and the control information is transmitted according to the fixed link path, so that the reliability of transmission and the transmission rate can be effectively improved.
Referring to fig. 7, fig. 7 is a flowchart illustrating a communication method according to a sixth embodiment of the present invention. The communication method provided by the invention comprises the following steps:
s601: and transmitting the communication condition information to the base station.
And S602, receiving and adopting the backhaul link path selected and sent by the base station, wherein the backhaul link path can be selected from the backhaul link paths matched with the communication condition information in the backhaul link path set.
Steps S601 to S602 are substantially similar to steps S401 to S402 in the fourth embodiment of the communication circuit provided in the present invention, and are not described herein again.
S603: a request for backhaul link path reconfiguration sent to the base station.
In a specific implementation scenario, if the backhaul link path received by the relay node and selected by the base station is different from the default backhaul link path of the original relay node, the new backhaul link path needs to be confirmed.
S604: receiving confirmation information of resetting of the return link path sent by the base station
In a specific implementation scenario, the base station receives a backhaul link path replanning request sent by the relay node, confirms a new backhaul link path, and notifies the relay node to transmit a service according to the selected backhaul link path. After receiving the confirmation information, the relay node transmits the service according to the backhaul link path selected by the base station.
As can be seen from the above description, in this embodiment, when the received backhaul link path selected by the base station is different from the default backhaul link path, a secondary confirmation is performed to the base station, so as to ensure the correctness of the selection and avoid error and leakage or delay in service transmission.
Please refer to fig. 8 and fig. 9. Fig. 8 is a flowchart illustrating a communication method according to a seventh embodiment of the present invention, and fig. 9 is a schematic diagram illustrating a connection relationship between a base station and a relay node according to the present invention. As shown in fig. 9, the base station 20 is wirelessly connected with three relay nodes 31, 32, and 33, and the base station 20 transmits traffic with the three relay nodes 31, 32, and 33 by millimeter waves. In other embodiments, traffic may also be transmitted via other electromagnetic waves. The backhaul of the three relay nodes 31, 32, and 33 with the base station 20 in this embodiment is defined to support single-hop (relay nodes directly wirelessly connect the base station) and dual-hop (one relay node connects the base station through another relay node) modes.
As shown in fig. 8, the communication method provided by the present invention includes:
the base station maintains a backhaul link path list of a control layer, and in a specific implementation scenario, transmission of a control message of a backhaul link between the base station and a relay node or a plurality of relay nodes is known or slowly changes, so the base station needs to maintain a backhaul link path list of a control layer. The backhaul link path of the control layer refers to a link path through which the base station transmits a message to the relay node. As shown in the connection relationship in fig. 9, the backhaul link path of the control layer includes the base station 20 → the relay node 31, the base station 20 → the relay node 32, and the base station 20 → the relay node 33.
And the base station broadcasts the return link path list to the relay node, and after broadcasting the return link path of the control layer to the relay node, the subsequent control information is sent to the relay node through the return link path.
The base station transmits a communication status information detection request to the relay node, and the relay node starts detection of the communication status of all the backhaul link paths starting from the relay node in response to the communication status detection request, and transmits the detected communication status information to the base station.
Specifically, the communication condition information includes at least one of communication quality of all backhaul link paths starting from the backhaul link, a traffic type to be transmitted, a resource requirement of the backhaul link, and an access link sharing the same frequency band as the backhaul link. In this implementation scenario, the communication quality of all backhaul link paths starting from the backhaul link path is mainly represented by the Signal-to-Noise Ratio of the backhaul link path, which reflects the case of Signal Interference, and during the test, the maximum SINR (Signal-to-Interference plus Noise Ratio) is 30, and the minimum SINR reaches a negative value. Generally speaking, the signal quality is considered to be excellent when the SINR is more than or equal to 25, the signal quality is considered to be good when the SINR is more than 25 and more than 20, the signal quality is considered to be general when the SINR is more than or equal to 20 and more than or equal to 10, and the signal quality is considered to be poor when the SINR is less than 5. In other implementation scenarios, parameters such as reference signal received power, reference signal received quality, and received signal strength may also be used as reference indicators.
In this embodiment, the service type to be transmitted includes at least one of whether the service is a delay sensitive type and a communication quality requirement of the service, and in other implementation scenarios, priorities of different services may also be directly preset. The requirement of communication quality is determined according to whether the service is easily interfered in the transmission process, if the service is easily interfered, the requirement of communication quality is high, and if the service has strong interference carrying capacity or has a certain fault-tolerant space and can accept certain interference, the requirement of communication quality is lower.
In this implementation scenario, the resource requirements of the backhaul link and the access link sharing the same frequency band as the backhaul link include at least one of traffic volume that needs to be transmitted by the backhaul link and the access link connected to the same relay node and a resource reuse rate of the shared frequency band of the backhaul link and the access link. When a relay node transmits a large amount of services at the same time on the backhaul link and the access link, the resource reuse rate of the shared frequency band of the backhaul link and the access link is high, which means that the probability of interference and delay on the path using the backhaul link is high at the same time.
In another implementation scenario, the base station may receive the communication status information obtained by detecting the communication statuses of all the backhaul link paths with the relay node as a starting point at regular time intervals according to a preset cycle, and transmitting the detected communication status information.
The base station selects a backhaul link path matching the communication condition information among the selectable set of backhaul link paths. In this implementation scenario, the base station selects the most appropriate backhaul link path from the set of single-hop and multi-hop backhaul link paths according to the received communication condition information. In the connection relationship shown in fig. 9, the set of backhaul link paths for single hop and multi-hop includes: relay node 31 → base station 20, relay node 31 → relay node 32 → base station 20, relay node 31 → relay node 33 → base station 20, relay node 32 → relay node 31 → base station 20, relay node 32 → relay node 33 → base station 20, relay node 33 → relay node 31 → base station 20, relay node 33 → relay node 32 → base station 20.
Specifically, the most suitable backhaul link path is selected for the traffic according to the type of the traffic that needs to be transmitted. If the service needing to be transmitted is a delay sensitive type, the priority of the service is highest, the base station selects a return link path with the highest signal to noise ratio for the service, the lowest traffic quantity of the return link and the access link needing to be transmitted and the lowest resource reuse rate of a shared frequency band of the return link and the access link, if the requirement of the service needing to be transmitted on the communication quality is high, the service has higher priority, the base station selects a return link path with higher signal to noise ratio for the service, the lower traffic quantity of the return link and the access link needing to be transmitted and the lower resource reuse rate of the shared frequency band of the return link and the access link. If the service needing to be transmitted is not a delay sensitive type and has low requirement on communication quality, the base station selects a backhaul link path for other service with high priority and then selects a suitable backhaul link path for the service on the remaining backhaul link path.
Since the present embodiment selects suitable backhaul link paths for different types of services, even if the services are transmitted by the same relay node, the base station may select different backhaul link paths according to different priorities corresponding to different types of the services.
In another implementation scenario, before selecting different backhaul link paths for different services, the base station updates the candidate backhaul link paths according to the communication quality of the backhaul link paths in the received communication condition information. Specifically, the base station presets a screening condition for the communication quality of the backhaul link paths, if the communication quality of one backhaul link path does not meet the preset screening condition, if the backhaul link path is in the original candidate backhaul link path, the backhaul link path is deleted from the candidate backhaul link path, and if the backhaul link path is not in the original candidate backhaul link path, the backhaul link path is ignored. If the communication quality of one backhaul link path meets the preset screening condition, if the backhaul link path is in the original candidate backhaul link path, the backhaul link path is maintained, and if the backhaul link path is not in the original candidate backhaul link path, the backhaul link path is added to the candidate backhaul link path.
For example, if the backhaul link path SINR (relay node 31 → base station 20) in fig. 9 is 18, the preset threshold is 20, and the communication quality of the backhaul link path of the relay node 31 → base station 20 does not meet the preset condition, the backhaul link path of the relay node 31 → base station 20 is deleted from the candidate backhaul link paths. If the backhaul link path SINR (relay node 31 → base station 20) ═ 22 in another test, and the communication quality of the backhaul link path of the relay node 31 → base station 20 meets the preset condition, the backhaul link path of the relay node 31 → base station 20 is added to the candidate backhaul link paths.
In this implementation scenario, the preset screening condition is that the communication signal-to-noise ratio of the backhaul link path is greater than or equal to a preset threshold. In other embodiments, the parameters such as the reference signal received power, the reference signal received quality, and the received signal strength may be greater than a preset threshold. Therefore, the backhaul link path with serious interference caused by the fact that the backhaul link and the access link share the same frequency band cannot be used as the candidate backhaul link path, the number of the backhaul link paths to be selected by the base station can be effectively reduced, and the quality of service transmission is improved.
In order to reduce the complexity of scheduling backhaul link paths, in this implementation scenario, before the base station sends the selected backhaul link path to the relay node, the relay node is notified to unload at least part of scheduling subtasks, thereby reducing the workload.
The base station transmits the selected backhaul link path to the relay node. After selecting different backhaul link paths for different services, the base station sends the selected backhaul link paths to corresponding relay nodes that need to send the services. After receiving the selected backhaul link paths, the relay node transmits different services through different backhaul link paths according to the selection of the base station.
The relay node sends a backhaul link path re-planning request based on the selected backhaul link path. If the backhaul link path selected by the base station is different from the default backhaul link path of the original relay node, the relay node needs to confirm the new backhaul link path.
And sending a return link path replanning confirmation message to the relay node, receiving a return link path replanning request sent by the relay node based on the selected return link path by the base station, confirming the new return link path, and informing the relay node of transmitting the service according to the selected return link path.
And after receiving the confirmation message of the base station, the relay node transmits the service according to the return link path selected by the base station.
As can be seen from the above description, in this embodiment, the base station receives the communication status information sent by the relay node, and selects a matched backhaul link path for the traffic to be transmitted based on the received communication status information, and sends the selected backhaul link path to the relay node. The relay node transmits the service according to the received backhaul link path, and can dynamically select a suitable backhaul link path, thereby improving the utilization efficiency of resources and reducing the waste of resources.
Referring to fig. 10, fig. 10 is a schematic structural diagram of a base station according to an embodiment of the present invention. The base station 40 comprises a first processing circuit 41 and a first communication circuit 42 electrically coupled to each other. Referring to fig. 11, fig. 11 is a schematic structural diagram of a relay node according to an embodiment of the present invention. The relay node 50 comprises a second processing circuit 51 and a second communication circuit 52 electrically coupled to each other. The base station 40 mutually transmits information with the second communication circuit 52 of the relay node 50 through the first communication circuit 42. The first communication circuit 42 of the base station 40 and the second communication circuit 52 of the relay node 50 are also used for communicating information with the user terminal. In the present embodiment, the frequency used for transmitting information between the base station 40 and the relay node 50 is equal to the frequency used for transmitting information between the relay node 50 and the terminal.
In actual operation, the first processing circuit 41 of the base station 40 controls the first communication circuit 42, and the second processing circuit 51 of the relay node 50 controls the second communication circuit 52, thereby implementing the communication method shown in any one of the embodiments of fig. 1, 3 to 8.
As can be seen from the above description, the first processing circuit of the base station of the present embodiment controls the first communication circuit to receive the communication state information transmitted by the second processing circuit of the relay node, and selects a matched backhaul link path according to the communication state information, and transmits the backhaul link path to the relay node through the first communication circuit. And the second processing circuit of the relay node controls the second communication circuit to receive the selected backhaul link path and transmits services according to the backhaul link path, so that a method for dynamically selecting a suitable backhaul link path can be used, the use efficiency of resources is improved, and the waste of resources is reduced.
Referring to fig. 12, fig. 12 is a schematic structural diagram of an embodiment of a device with a storage function according to the present invention, in which at least one program or instruction 61 is stored in the device with a storage function 60, and the program 61 or instruction is used to execute the communication method shown in fig. 1 and fig. 3 to fig. 8. In one embodiment, the apparatus with storage function may be a storage chip in a terminal, a hard disk, or a removable hard disk or other readable and writable storage tool such as a flash disk, an optical disk, or the like, and may also be a server or the like.
As can be seen from the above description, the program or the instruction stored in the embodiment of the apparatus with storage function according to the present invention may be used to implement a method for dynamically selecting an appropriate backhaul link path, so as to improve the utilization efficiency of resources and reduce the waste of resources.
Different from the prior art, the relay node sends the communication state information of the relay node to the base station, the base station selects the matched return link path according to the received communication state information and sends the selected return link path to the relay node, and the relay node transmits services according to the received return link path, so that a method for dynamically selecting a proper return link path can be realized, the use efficiency of resources is improved, and the waste of resources is reduced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (26)
1. A method of communication, comprising:
the base station receives communication condition information sent by at least one relay node, wherein the communication condition information comprises: the communication quality of all backhaul link paths of which the at least one relay node takes the at least one relay node as a starting point, the type of traffic which needs to be transmitted by the at least one relay node, and the resource requirements of the backhaul link and an access link sharing the same frequency band with the backhaul link;
the base station selects a backhaul link path matched with the type of service to be transmitted by the current relay node from an optional backhaul link path set corresponding to the relay node based on the communication quality of all backhaul link paths of which the relay node uses the base station as a starting point, and the resource requirements of the backhaul link and an access link sharing the same frequency band with the backhaul link;
and the base station sends the selected backhaul link path to a relay node to be adopted by the relay node.
2. The method of claim 1, wherein the step of the base station receiving the communication condition information sent from at least one relay node comprises:
the base station receives communication condition information periodically transmitted by the at least one relay node.
3. The method of claim 1, wherein the step of the base station receiving the communication condition information sent from at least one relay node comprises:
the base station sends a communication condition information detection request to the at least one relay node;
receiving communication condition information sent by the at least one relay node in response to the detection request.
4. The method of claim 1, wherein the step of the base station sending the selected backhaul link path to a relay node is preceded by:
informing the at least one relay node to offload at least part of the scheduling subtasks.
5. The method of claim 1,
the communication quality of all backhaul link paths of which the at least one relay node starts from itself includes: a signal-to-noise ratio of communications of the backhaul link path.
6. The method of claim 1,
the service types include: whether the service is of a delay sensitive type and at least one of a communication quality requirement of the service.
7. The method according to claim 6, wherein the step of the base station selecting the backhaul link path matching the traffic type required to be transmitted by the current relay node from the set of selectable backhaul link paths corresponding to the relay node comprises:
the traffic with the delay sensitivity has the highest priority, and the base station allocates the backhaul link path with the best communication quality to the traffic with the delay sensitivity.
8. The method of claim 1,
the resource requirements of the backhaul link and the access link sharing the same frequency band as the backhaul link include: at least one of an amount of traffic that needs to be transmitted by both the backhaul link and the access link, and a resource reuse rate of a frequency band shared by both.
9. The method according to any one of claims 1 to 3,
the optional backhaul link path set comprises a relay node single-hop backhaul link path and a multi-hop backhaul link path which adopt millimeter waves as transmission modes.
10. The method according to any of claims 1-3, wherein the step of the base station receiving the communication condition information transmitted from at least one relay node is preceded by:
the base station maintains a backhaul link path list of a control layer and broadcasts the list to the relay nodes.
11. The method according to any of claims 1-3, wherein the step of the base station selecting, based on the communication quality of all backhaul link paths from which the relay node starts, the resource requirements of the backhaul link and an access link sharing the same frequency band as the backhaul link, a backhaul link path matching the traffic type that needs to be transmitted by the current relay node from among the set of selectable backhaul link paths corresponding to the relay node, comprises:
deleting the backhaul link path of which the communication condition information does not satisfy a preset condition from the selectable backhaul links; and/or
And adding a new backhaul link path of which the communication condition information meets a preset condition in the selectable backhaul link.
12. The method of claim 11,
the preset condition is that the communication signal-to-noise ratio of the return link path is greater than or equal to a preset threshold value.
13. The method according to any of claims 1-3, wherein the step of the base station sending the selected backhaul link path to a relay node for the relay node comprises:
receiving a backhaul link path re-planning request sent by the at least one relay node based on the selected backhaul link path;
transmitting an acknowledgement backhaul link path re-planning message to the at least one relay node.
14. A method of communication, comprising:
transmitting communication condition information to a base station, the communication condition information comprising: the communication quality of all the backhaul link paths, the type of traffic to be transmitted, and the resource requirements of the backhaul links and the access links sharing the same frequency band with the backhaul links;
receiving and adopting a backhaul link path selected and sent by a base station, wherein the backhaul link path is a backhaul link path which is selected in an optional backhaul link path set and matched with the service type to be transmitted, and the backhaul link path shares the resource requirement of an access link of the same frequency band based on the communication quality of all the backhaul link paths by the base station.
15. The method of claim 14, wherein the step of transmitting the communication condition information to the base station comprises:
and sending the communication condition information to the base station at a preset period.
16. The method of claim 14, wherein the step of transmitting the communication condition information to the base station comprises:
receiving a communication condition information detection request transmitted by the base station;
and responding to the communication condition information sent to the base station by the detection request.
17. The method of claim 14, wherein the step of receiving and employing the backhaul link path selected and transmitted by the base station is preceded by:
and unloading at least part of the scheduling subtasks according to the notification of the base station.
18. The method of claim 14,
the communication quality of all backhaul link paths includes: a signal-to-noise ratio of communications of the backhaul link path.
19. The method of claim 14,
the service types include: whether the service is of a delay sensitive type and at least one of a communication quality requirement of the service.
20. The method of claim 14,
the resource requirements of the backhaul link and the access link sharing the same frequency band as the backhaul link include: at least one of the amount of traffic that needs to be transmitted by both the backhaul link and the access link and the resource reuse rate of the frequency band shared by both.
21. The method according to any one of claims 14 to 17,
the optional backhaul link path set comprises a relay node single-hop backhaul link path and a multi-hop backhaul link path which adopt millimeter waves as transmission modes.
22. The method according to any of claims 14-17, wherein the step of sending communication condition information to the base station is preceded by:
receiving a backhaul link path list of a control layer broadcast by the base station.
23. The method of any of claims 14-17, wherein the step of receiving and employing the backhaul link path selected and transmitted by the base station is followed by:
a request for backhaul link path reconfiguration sent to the base station;
and receiving confirmation information of the reset of the backhaul link path sent by the base station.
24. A base station comprising first processing circuitry and first communication circuitry electrically coupled to each other, the first processing circuitry being operable to execute instructions to implement a method as claimed in any one of claims 1 to 13.
25. A relay node comprising second processing circuitry and second communication circuitry electrically coupled to each other, the second processing circuitry being operable to execute instructions to implement the method of any of claims 14 to 23.
26. An apparatus having storage capability, wherein instructions are stored which, when executed, implement the method of any of claims 1-13, 14-23.
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| CN201710738593.5A CN109429294B (en) | 2017-08-24 | 2017-08-24 | Communication method, base station, relay node and device with storage performance |
| PCT/CN2017/110117 WO2019037283A1 (en) | 2017-08-24 | 2017-11-09 | Method, base station, relay node, and device with storage function for communication |
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| CN103220116A (en) * | 2013-05-16 | 2013-07-24 | 东南大学 | Distributed resource distribution method for multiple input multiple output (MIMO)-orthogonal frequency division multiple access (OFDMA) wireless relay system |
| CN104618934A (en) * | 2015-01-14 | 2015-05-13 | 西安交通大学 | Throughput forecast-based global optimization relay node selection method |
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| EP2494729B1 (en) * | 2009-10-30 | 2017-03-29 | BlackBerry Limited | Downlink mcs selection in a type 2 relay network |
| KR101790041B1 (en) * | 2011-06-24 | 2017-11-20 | 삼성전자주식회사 | Method and apparatus for setting transmission power of relay node |
| US9072000B2 (en) * | 2012-10-19 | 2015-06-30 | Qualcomm Incorporated | Power efficient relay discovery protocol |
| CN106162764A (en) * | 2015-04-03 | 2016-11-23 | 电信科学技术研究院 | A kind of routing resource and device |
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| CN102905309A (en) * | 2012-11-06 | 2013-01-30 | 重庆邮电大学 | Relay communication method based on cooperated multi-access control (MAC) protocol in vehicular automatic organization network |
| CN103220116A (en) * | 2013-05-16 | 2013-07-24 | 东南大学 | Distributed resource distribution method for multiple input multiple output (MIMO)-orthogonal frequency division multiple access (OFDMA) wireless relay system |
| CN106797602A (en) * | 2014-10-02 | 2017-05-31 | 高通股份有限公司 | Repeated link communicates |
| CN104618934A (en) * | 2015-01-14 | 2015-05-13 | 西安交通大学 | Throughput forecast-based global optimization relay node selection method |
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