CN110392406B - Method, apparatus and computer readable medium for handover in a communication system - Google Patents
Method, apparatus and computer readable medium for handover in a communication system Download PDFInfo
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Abstract
Embodiments of the present disclosure relate to methods, apparatuses, and computer-readable media for handoff in a communication system. According to the embodiments of the present disclosure, the controller can clarify the transmission performance of the communication network and the change of the communication network (e.g., movement of the terminal device, etc.), and store the transmission performance information. According to an embodiment of the present disclosure, the controller determines a target network device for handover of the terminal device. Further, the controller may compare the current state information of the terminal device with the history switching information stored in the transmission performance information, thereby rapidly determining whether the terminal device is switched and to which network device.
Description
Technical Field
Embodiments of the present disclosure relate generally to communication technology and, more particularly, relate to a method, apparatus, and computer readable medium for handoff in a communication system.
Background
In a communication network, as a terminal device moves, a network device to which the terminal device is connected needs to be switched. In communication networks such as Wireless Mesh Networks (WMNs), it is very challenging to perform a handoff. For handover in a wireless communication network, studies have been conducted to provide fast and seamless handover of a terminal device between two network devices, and an optimal network device can be selected for handover. In the current technology, research on handover in a communication network is mainly focused on terminal devices, not network devices. Therefore, further research on the network device is also required in order to further improve the handover technology.
Disclosure of Invention
Embodiments of the present disclosure relate generally to a method for terminal device handover in a communication system and a corresponding network device.
In a first aspect, embodiments of the present disclosure provide a communication method. The method comprises the following steps: transmission performance information of a plurality of network devices of a communication system is obtained. The method further comprises the steps of: and determining the terminal equipment meeting the switching condition in the communication system. The method further comprises determining current state information of the terminal device. The current state information includes current location information of the terminal device. The method further comprises the steps of: based on the location information and the transmission performance information, a target network device is determined from the plurality of network devices for switching the terminal device.
In a second aspect, embodiments of the present disclosure provide a communication device. The network device includes: at least one processor; and a memory coupled to the at least one processor, the memory having instructions stored therein, which when executed by the at least one processor, cause the terminal device to perform actions comprising: the act of obtaining transmission performance information for a plurality of network devices of the communication system further comprises: and determining the terminal equipment meeting the switching condition in the communication system. The actions further include: the method comprises the steps of determining current state information of the terminal equipment, wherein the current state information comprises current position information of the terminal equipment. The actions further include: based on the location information and the transmission performance information, a target network device is determined from the plurality of network devices for switching the terminal device.
In a third aspect, embodiments of the present disclosure provide a communication device. The device comprises: means for obtaining transmission performance information of a plurality of network devices of the communication system. The apparatus further comprises: means for determining a terminal device in the communication system that satisfies a handover condition. The apparatus further comprises: means for determining current state information of the terminal device, the current state information comprising current location information of the terminal device. The apparatus further comprises: and means for determining a target network device from the plurality of network devices for switching the terminal device based on the location information and the transmission performance information.
In a fourth aspect, embodiments of the present disclosure provide a computer-readable storage medium. The computer readable storage medium comprises program code stored thereon which, when executed by an apparatus, causes the apparatus to perform the method according to the first aspect.
It should be understood that the description in this summary is not intended to limit key or critical features of the disclosed embodiments, nor is it intended to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
The above and other features, advantages, and aspects of embodiments of the present disclosure will become more apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings in which:
fig. 1 shows a block diagram of a communication system that may be used for handover;
FIG. 2 illustrates a block diagram of an example communication system in which embodiments of the present disclosure may be implemented;
FIG. 3 illustrates a flowchart of an example method according to certain embodiments of the present disclosure;
FIG. 4 illustrates a flowchart of an example method according to some embodiments of the present disclosure; and
fig. 5 illustrates a block diagram of a communication device in accordance with certain embodiments of the present disclosure.
The same or similar reference numbers will be used throughout the drawings to refer to the same or like elements.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure have been shown in the accompanying drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.
The term "circuitry" as used herein refers to one or more of the following:
(a) Hardware-only circuit implementations (such as analog-only and/or digital-circuit implementations); and
(b) A combination of hardware circuitry and software, such as (if applicable): (i) A combination of analog and/or digital hardware circuitry and software/firmware, and (ii) any portion of a hardware processor and software (including digital signal processors, software, and memory that work together to cause an apparatus, such as an OLT or other computing device, to perform various functions); and
(c) Hardware circuitry and/or a processor, such as a microprocessor or a portion of a microprocessor, that requires software (e.g., firmware) for operation, but may not have software when software is not required for operation.
The definition of circuit applies to all scenarios in which this term is used in this application, including in any claims. As another example, the term "circuitry" as used herein also covers an implementation of only a hardware circuit or processor (or multiple processors), or a portion of a hardware circuit or processor, or its accompanying software or firmware. For example, if applicable to the particular claim element, the term "circuitry" also covers a baseband integrated circuit or processor integrated circuit or similar integrated circuit in an OLT or other computing device.
The term "network device" as used herein refers to any suitable entity or device capable of providing a cell or coverage such that a terminal device may access a network through or receive services from it. Examples of network devices include, for example, base stations. The term "base station" (BS) as used herein may refer to a node B (NodeB or NB), an evolved node B (eNodeB or eNB), a gNB, a Remote Radio Unit (RRU), a Radio Head (RH), a Remote Radio Head (RRH), a repeater, an Access Point (AP), or a low power node such as a pico base station, femto base station, etc.
The term "terminal device" or "user equipment" (UE) as used herein refers to any entity or device capable of wireless communication with a network device or with each other. As an example, the terminal device may include a Mobile Terminal (MT), a Subscriber Station (SS), a Portable Subscriber Station (PSS), a Mobile Station (MS) or an Access Terminal (AT), the above-mentioned devices on-vehicle, a machine or an electric appliance having a communication function, and the like.
The term "including" and variations thereof as used herein are intended to be open-ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment". Related definitions of other terms will be given in the description below.
As described above, the researches on handover in the related art are mainly focused on the terminal device. The network device selected by the terminal device to be handed over may not be optimal due to the presence of non-managed neighboring nodes controlled by different operators. Furthermore, in communication networks such as WMNs, the network environment changes rapidly, and thus the target network device selected using current techniques may not be optimal in the changed environment. In addition, the selection of the target network device introduces additional costs (such as neighborhood scanning at the location of the terminal device and/or control message exchange between the terminal device and the currently connected network device), which may reduce overall performance. Thus, to provide an efficient handoff procedure, changes in the non-managed neighboring access points and communication environment (e.g., user behavior) must be accounted for.
Furthermore, in e.g. WMNs, the handover procedure in WMNs is more challenging because there is only one Access Point (AP) accessing the internet, and thus the overlapping coverage of APs in the network is much larger than in public and enterprise wireless networks.
Fig. 1 illustrates an example block diagram of a communication system 100 that can be employed to implement a handoff. Communication system 100 includes network device 130-1, network device 130-2, and terminal device 110. It is understood that the number of network devices and terminal devices shown in communication system 100 is merely exemplary. Typically, roaming from one network device to another network device in a terminal device requires four phases to go through. The description will be made below with reference to fig. 1.
(1) And triggering a stage. As shown in fig. 1, terminal device 110 is connected to network device 130-2. Terminal device 110 may trigger the handover procedure if terminal device 110 determines that the link condition between it and network device 130-2 is poor. For example, terminal device 110 may determine the link condition based on a Received Signal Strength (RSSI).
(2) And (3) a discovery stage. The terminal device 110 gathers information about neighboring APs and their associated performance metrics. Since the discovery phase takes the longest time, the terminal device 110 can be provided with a short list of neighboring network devices so that it does not need to perform a full scan over all available channels.
(3) Network device selection. Terminal device 110 may select an appropriate network device from the list of network devices for handover. For example, terminal device 110 may select the network device with the strongest RSSI. Terminal device 110 may also select a network device based on quality of service (QoS), distance, etc. Handover typically considers load balancing solutions in wireless networks. For example, the target network device is selected based on path metrics (from associated/connected network device to gateway) and access link quality (from final terminal device to connected AP). The path metrics are sent by the beacons to the terminal device and are determined by the routing protocol. For example, hop count, desired transmission time, desired number of transmissions, and wireless and bandwidth aware routing path metrics may be selected as path metrics in a multi-hop wireless network.
In the prior art, however, the discovery and selection phase of the network device may introduce significant delays in the handover procedure and none take into account the dynamic environment of the communication network.
Fig. 2 illustrates an example communication system 200 in which embodiments of the present disclosure may be implemented. In this example, communication system 100 includes terminal device 210-1, terminal device 210-2, terminal device 210-N (collectively, "terminal device 210", where N is a positive integer), controller 220, network device 230-1, network device 230-2, network device 230-M (collectively, "network device 230", where M is a positive integer). It will be appreciated that the number of terminal devices, controllers, and network devices shown in fig. 2 is merely exemplary and not limiting. Communication system 200 may include any suitable number of terminal devices and network devices. Communication system 200 may also include other network elements such as gateway devices (not shown).
In some embodiments, the controller 220 may be implemented at a network device for handover. For example, any network device may be randomly selected as the controller 220. The controller 220 may also be implemented at a gateway device. In other embodiments, the controller 220 may be implemented on the cloud. It will be appreciated that implementations of the present disclosure are not limited in this respect. The controller 220 may be in communication with the terminal device 210 and the network device 230.
According to the embodiment of the present disclosure, the controller 220 can clarify the transmission performance of the communication network 200 and the change of the communication network 200 (e.g., movement of the terminal device 210, etc.), and store the transmission performance information. According to an embodiment of the present disclosure, the controller 220 determines a target network device for handover of the terminal device. Further, the controller 220 may compare the current state information of the terminal device with the history switching information stored in the transmission performance information, thereby rapidly determining whether and to which network device the terminal device is switched.
In this way, since the controller 220 determines the target network device for handover instead of the terminal device, the controller 220 can determine an optimal target network device based on the overall situation of the network and the stored information, thereby improving the efficiency and performance of handover.
Fig. 3 illustrates a flowchart of an example method 300 according to some embodiments of the present disclosure. The method 300 may be implemented at the controller 220 as shown in fig. 1.
At block 310, the controller 220 obtains transmission performance information for a plurality of network devices (e.g., network device 230-1, network device 230-2, etc.) in the communication system 200. In some embodiments, the transmission capability information of the network device may include a location of the network device. The transmission performance information of the network device may also include channel utilization of the network device. Alternatively or additionally, the transmission performance information of the network device may be a transmission error rate and/or a retransmission rate of the network device. Fig. 4 illustrates a flowchart of a method 400 for obtaining transmission performance of a plurality of network devices, according to an embodiment of the present disclosure. It is to be understood that the method 400 is merely exemplary and not limiting.
At block 410, the controller 220 obtains transmission environment information for a plurality of network devices. In some embodiments, controller 220 may determine network devices present in communication system 200, such as network device 230-1, network device 230-2. For illustrative purposes only, the presence of network device 230-1 and network device 230-2 in a communication system will be described below as examples.
In some embodiments, controller 220 may periodically inform network device 230-1 and network device 230-2 to send their transmission environment information to controller 220. The network device 230-1 and the network device 230-2 may also update the changed transmission environment information to the controller 220 based on the change in their own transmission environment. Network device 230-1 and network device 230-2 may send the transmission environment information directly to controller 220. Network device 230-1 and network device 230-2 may also store the transmission environment information in a memory (e.g., cloud memory) accessible by controller 220.
In some embodiments, the transmission environment information may include transmission information of a channel with the network device and transmission information of a terminal device connected with the network device. For example, the network device 230-1 and may transmit information of an index of a channel it is occupied, a time period the channel is occupied, an amount of data transmitted on the channel, a noise level on the channel, and the like as transmission information of the channel to the controller 220. It will be appreciated that the transmission information of the channel may be any combination of one or more of the above, and that the transmission information of the channel may also include other information (e.g., signal-to-noise ratio) indicative of the transmission of the channel. Embodiments of the disclosure are not limited in this respect.
In other embodiments, the network device 230-1 may transmit information such as received signal strength, transmission error rate, retransmission rate, etc. of the terminal device connected thereto as transmission information of the terminal device to the controller 220. It will be appreciated that the transmission information of the terminal device may be any combination of one or more of the above information, and the transmission information of the terminal device may also include other information indicating the transmission situation of the terminal device. If the network device 230-1 is connected to the terminal device 210-1 and the terminal device 210-2, the network device 230-1 transmits transmission information of both the terminal device 210-1 and the terminal device 210-2 to the controller 220.
At block 420, the controller 220 determines transmission performance information for the plurality of network devices based on the transmission environment information. For example only, the controller 220 may determine the channel occupancy of the network device according to the following equation (1).
Wherein u is h Representing the channel occupancy.
Alternatively or additionally, the controller 220 may determine that the network device is on a certain channel (e.g., channel d) according to the following equation (2) k i ) Average error rate over time.
Wherein d k i Representing the identity of the channel, s representing the terminal device,
representing channel d k i Average error rate over error rate s Represented on channel d k i Error rate of terminal device s (e.g., terminal device 210-1).
In some embodiments, the controller 220 may determine that the network device is on a certain channel (e.g., channel d) according to the following equation (3) k i ) Average retransmission rate over the same.
Wherein d k i Representing the identity of the channel, s representing the terminal device,
representing channel d k i Average retransmission rate on a retry_rate s Represented on channel d k i Retransmission rate of terminal device s (e.g., terminal device 210-1).
Alternatively or additionally, the network device 230-1 may determine the location of the terminal device 210-1 to which it is connected. The network device 230-1 may determine one or more of the information of the received signal strength, the transmission error rate, and the retransmission rate of the terminal device 210-1 at the location. If the terminal device 210-2 is also connected to a network device, the network device 230-1 may also determine the location of the terminal device 210-2 and one or more of the information of received signal strength, transmission error rate, and retransmission rate at the location.
In some embodiments, the controller 220 may utilize a machine learning method to obtain transmission performance information for a plurality of network devices. For example, the controller 220 may determine a priority of a particular terminal device to switch to a particular network device at a particular location based on the transmission environment information. The following exemplarily describes that the controller 220 may obtain transmission performance information using a machine learning method. For illustrative purposes only, the terminal device 210-1 connected to the network device 230-1 will be exemplified below.
As described above, the location of the terminal device 210-1 relative to the network device 230-1 may be determined. The received signal strength, transmission error rate, and retransmission rate of the terminal device 210-1 at that location may all be determined. The above information of the terminal device 210-1 may be referred to as status information. In this example, terminal device 210-1 may switch to other network devices, such as network device 230-2. The terminal device 210-1 may not perform handover. The terminal device 210-1 may have different transmission conditions to switch to a different network device. The instantaneous prize with different transmission conditions can be expressed by the following equation (4):
r t (s,a,v i )＝∑R k (4)
where s denotes the state of the terminal device 210-1, a denotes the switching actions that the terminal device 210-1 can perform, v i Representing the ith network device, R k Representing end-to-end user throughput.
Since in the communication network, the terminal device 210-1 performs different handovers with different effects on the whole communication network, rewards of the whole communication network can be defined (formula (5) below).
Wherein Q(s) t ,a t ,v i ) Is the jackpot for state s to take action a at time t; r is (r) t+1 By taking action a t Then from state S t To state S t+1 And a prize obtained by conversion of the number of the game. The parameters η and γ are the learning factor and the detraction rate, respectively, with values between 0 and 1. The learning factor η controls the convergence rate of learning. The detraction rate gamma is used to measure recent rewards. Specifically, the closer γ is to 1, the greater the weight of the future awards.
In this way, the controller will learn the relationship between the weight value of the target network device and its corresponding reward when the terminal device 210-1 switches to the target network device. The handover decision will take advantage of this relationship and perform a handover to the current target network device only if its weight value would result in a higher prize than the current prize. When rewards of the plurality of network devices are higher than that of the current network, the network device with the highest rewards is set to be the highest switching priority, so that the optimal target network device is effectively ensured to be selected.
At block 430, the controller 220 stores the transmission performance information of the network device. For example, the controller 220 may store transmission performance information of the network device in the form of a table. The controller 220 may also store transmission performance information of the network device in the form of a tree. Table 1 below shows one example storage of transmission performance information.
TABLE 1
Where b represents transmission performance information of the network device, which may be stored as table 2 below, and q represents rewards, which may be stored as table 3 below. It is to be understood that the values shown in tables 2 and 3 below are exemplary only and not limiting.
TABLE 2
TABLE 3 Table 3
Returning to fig. 3, at block 320, the controller 220 may determine terminal devices in the communication system 200 that satisfy the handoff condition. For example, the controller 220 may determine a terminal device having a received signal strength lower than a certain threshold strength as a terminal device satisfying the handover condition. In some embodiments, the controller 220 may also determine a terminal device having an error rate higher than the threshold error rate as a terminal device satisfying the handover condition. Additionally or alternatively, the controller 220 may also determine a terminal device having a retransmission rate higher than the threshold retransmission as a terminal device satisfying the handover condition. The threshold may be preset according to the network transmission requirements.
In some embodiments, the controller 220 may also determine problems that may exist in the communication system 200 based on conditions satisfied by the terminal device. For example, if the received signal strength of the terminal device is below a threshold strength, it is indicated that there is a problem with the signal coverage area of the network device. If the error rate of the terminal device is above the threshold error rate, it is indicated that there may be a hidden network device in the communication system 200. If the retransmission rate of the terminal device is above the threshold retransmission, it is indicated that there may be an exposed network device in the communication system 200.
In some embodiments, the controller 220 may also determine whether it satisfies the handover condition according to the location information of the terminal device. For example, whether the terminal device is closer to another network device than the network device to which the terminal device is connected.
At block 330, the controller 220 determines current state information for the terminal device. For example, the controller 220 may determine the current location of the terminal device. The current status information may also include one or any combination of a current received signal strength, a current error rate, and a current retransmission rate of the terminal device.
At block 340, the controller 220 determines a target network device from the plurality of network devices based on the location information and the transmission capability information. In some embodiments, the controller 220 determines that the location of the terminal device is close to the location of the terminal device in the stored transmission capability information, e.g., the distance is below a threshold distance, the controller 220 may select a target network device for the terminal device based on the transmission capability information for handover. If there is no similar situation in the transmission capability information, the controller 220 needs to select a target network device for the terminal device according to the current state information of the terminal device and the transmission capability information, and update the transmission capability information with the current state information of the terminal device.
By way of example only, assume that terminal device 210-1 is located at a location (x STA ,y STA ) The network device 230-1 connected thereto is located at a position (x 1 ,y 1 ) Network device 230-2 is located at a location (x 2 ,y 2 ). If equation (7) below is satisfied, it is illustrated that network device 230-2 may be the target network device.
If there are a plurality of network devices satisfying the above formula (7), the controller selects a target network device according to the priorities (i.e., weights) of the network devices. In some embodiments, the controller 220 may also calculate a reward for the target network device, and if the reward for switching to the target network device is lower than the currently connected network device, the controller 220 will not switch.
In some embodiments, an apparatus (e.g., controller 220) capable of performing method 300 may include corresponding components for performing the various steps of method 300. These components may be implemented in any suitable manner. For example, it may be implemented by a circuit or a software module.
In some embodiments, an apparatus includes means for obtaining transmission performance information for a plurality of network devices of a communication system; means for determining a terminal device in the communication system that satisfies a handover condition; means for determining current state information of the terminal device, the current state information including current location information of the terminal device; and means for determining a target network device from the plurality of network devices for switching the terminal device based on the location information and the transmission performance information.
In some embodiments, the means for obtaining transmission performance information for a plurality of network devices of the communication system comprises: means for obtaining transmission environment information for a plurality of network devices, the transmission environment information comprising at least one of: transmission information on channels of a plurality of network devices, and transmission information of terminal devices connected to the plurality of network devices; means for determining transmission performance information of a plurality of network devices based on the transmission environment information; and means for storing transmission performance information of the plurality of network devices.
In some embodiments, the transmission performance information of the plurality of network devices includes at least one of: location information of a plurality of network devices, channel utilization of the plurality of network devices, transmission error rates of the plurality of network devices, and retransmission rates of the plurality of network devices.
In some embodiments, the means for obtaining transmission performance information for a plurality of network devices of the communication system comprises: means for determining, for a first network device of the plurality of network devices, a first location of a first terminal device connected to the first network device relative to the first network device; means for determining that the first terminal device is at the first location at least one of: the received signal strength of the first terminal device, the transmission error rate of the first terminal device, and the retransmission rate of the first terminal device; and means for determining a priority for the first terminal device to switch to other network devices of the plurality of network devices at the first location.
In some embodiments, the means for determining a terminal device in the communication system that satisfies the handover condition comprises: means for determining that the terminal device meets at least one of: the received signal strength of the terminal device is lower than a first predetermined threshold strength; the error rate of the terminal equipment is higher than a second preset threshold error rate; and the retransmission rate of the terminal device is higher than a third predetermined threshold retransmission rate.
In some embodiments, the means for determining current state information of the terminal device comprises: means for determining current location information of the terminal device; and means for determining at least one of the following at the current location of the terminal device: the current received signal strength of the terminal device; the current error rate of the terminal equipment; and the current retransmission rate of the terminal device.
In some embodiments, the means for determining the target network device from the plurality of network devices comprises: means for determining, from the plurality of network devices, network devices that are adjacent to the terminal device as candidate network devices based on the current location; and means for determining the network device having the optimal transmission performance as the target node based on the transmission performance information and the current state information of the candidate network device.
In certain embodiments, the apparatus further comprises: and means for updating the transmission performance information based on the current state information.
Fig. 5 is a block diagram of a device 500 in which embodiments in accordance with the present disclosure may be implemented. As shown in fig. 5, the device 500 includes one or more processors 510, one or more memories 520 coupled to the processors 510, one or more transmitters and/or receivers 540 coupled to the processors 510.
The instructions 530 are assumed to include program instructions that, when executed by the associated processor 610, cause the apparatus 500 to operate in accordance with the embodiments described in the present disclosure with reference to fig. 2-4. That is, embodiments of the present disclosure may be implemented by computer software execution by the processor 510 of the device 500, or by hardware, or by a combination of software and hardware.
In general, the various example embodiments of the disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While aspects of the embodiments of the present disclosure are illustrated or described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
By way of example, embodiments of the present disclosure may be described in the context of machine-executable instructions, such as program modules, being included in devices on a real or virtual processor of a target. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. In various embodiments, the functionality of the program modules may be combined or split between described program modules. Machine-executable instructions for program modules may be executed within local or distributed devices. In a distributed device, program modules may be located in both local and remote memory storage media.
Computer program code for carrying out methods of the present disclosure may be written in one or more programming languages. These computer program code may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus such that the program code, when executed by the computer or other programmable data processing apparatus, causes the functions/operations specified in the flowchart and/or block diagram to be implemented. The program code may execute entirely on the computer, partly on the computer, as a stand-alone software package, partly on the computer and partly on a remote computer or entirely on the remote computer or server.
In the context of this disclosure, computer program code or related data may be carried by any suitable carrier to enable an apparatus, device, or processor to perform the various processes and operations described above. Examples of carriers include signals, computer readable media, and the like.
Examples of signals may include electrical, optical, radio, acoustical or other form of propagated signals, such as carrier waves, infrared signals, etc.
In the context of this disclosure, a machine-readable medium may be any tangible medium that can contain, or store a program for or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More detailed examples of a machine-readable storage medium include an electrical connection with one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical storage device, a magnetic storage device, or any suitable combination thereof.
In addition, although operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In some cases, multitasking or parallel processing may be beneficial. Likewise, although the foregoing discussion contains certain specific implementation details, this should not be construed as limiting the scope of any invention or claims, but rather as describing particular embodiments that may be directed to particular inventions. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.
Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims (22)
1. A communication method implemented in a Wireless Mesh Network (WMN), implementing a controller at any network device, gateway device, or cloud for handoff, the method comprising:
the controller obtains transmission environment information of a plurality of network devices, determines transmission performance information of the plurality of network devices based on the transmission environment information, wherein,
determining, for a first network device of the plurality of network devices, a first location of a first terminal device connected to the first network device relative to the first network device;
determining that the first terminal device is at a first location at least one of:
the received signal strength of the first terminal device,
the transmission error rate of the first terminal device
The retransmission rate of the first terminal device;
and
Determining a priority for the first terminal device to switch to other network devices of the plurality of network devices at the first location;
storing the transmission performance information of the plurality of network devices;
wherein the transmission environment information is obtained by periodically notifying the plurality of network devices, or the transmission environment information stored by the plurality of network devices is obtained by an accessible memory;
The controller determines terminal equipment meeting a switching condition in the communication system;
the controller determines current state information of the terminal equipment, wherein the current state information comprises current position information of the terminal equipment; and
the controller selects a target network device to be handed over to from the plurality of network devices for the terminal device based on the location information and the transmission performance information.
2. The method of claim 1, wherein the transmission environment information comprises at least one of: transmission information related to channels of the plurality of network devices and transmission information of terminal devices connected to the plurality of network devices.
3. The method of claim 1, wherein the transmission performance information of the plurality of network devices comprises at least one of:
location information of the plurality of network devices,
channel utilization of the plurality of network devices,
transmission error rates of the plurality of network devices
Retransmission rates of the plurality of network devices.
4. The method of claim 1, wherein determining the terminal device in the communication system that satisfies a handover condition comprises:
determining that the terminal device satisfies at least one of the following:
The received signal strength of the terminal device is lower than a first predetermined threshold strength;
the error rate of the terminal equipment is higher than a second preset threshold error rate; and
the retransmission rate of the terminal device is higher than a third predetermined threshold retransmission rate.
5. The method of claim 1, wherein determining current state information of the terminal device comprises:
determining the current position information of the terminal equipment; and
determining at least one of the following of the terminal device at the current location:
the current received signal strength of the terminal equipment;
the current error rate of the terminal equipment; and
and the current retransmission rate of the terminal equipment.
6. The method of claim 1, wherein selecting a target network device from the plurality of network devices to which to hand-off the terminal device comprises:
determining, from the plurality of network devices, network devices that are adjacent to the terminal device as candidate network devices based on the current location; and
and determining the network device with the optimal transmission performance as a target node based on the transmission performance information of the candidate network device and the current state information.
7. The method of claim 1, further comprising:
And updating the transmission performance information based on the current state information.
8. A communication device in a Wireless Mesh Network (WMN), implemented at any network device, gateway device, or cloud for handoff, comprising
At least one processor; and
a memory coupled with the at least one processor, the memory having instructions stored therein, which when executed by the at least one processor, cause the communication device to perform actions comprising:
obtaining transmission environment information of a plurality of network devices, determining transmission performance information of the plurality of network devices based on the transmission environment information, wherein,
determining, for a first network device of the plurality of network devices, a first location of a first terminal device connected to the first network device relative to the first network device;
determining that the first terminal device is at a first location at least one of:
the received signal strength of the first terminal device,
the transmission error rate of the first terminal device
The retransmission rate of the first terminal device;
and
Determining a priority for the first terminal device to switch to other network devices of the plurality of network devices at the first location;
Storing the transmission performance information of the plurality of network devices;
wherein the transmission environment information is obtained by periodically notifying the plurality of network devices, or the transmission environment information stored by the plurality of network devices is obtained by an accessible memory;
determining terminal equipment meeting a switching condition in a communication system;
determining current state information of the terminal equipment, wherein the current state information comprises current position information of the terminal equipment; and
and selecting a target network device to be switched to for the terminal device from the plurality of network devices based on the position information and the transmission performance information.
9. The communication device of claim 8, the transmission environment information comprising at least one of: transmission information related to channels of the plurality of network devices and transmission information of terminal devices connected to the plurality of network devices.
10. The communication device of claim 8, wherein the transmission performance information of the plurality of network devices comprises at least one of:
location information of the plurality of network devices,
channel utilization of the plurality of network devices,
Transmission error rates of the plurality of network devices
Retransmission rates of the plurality of network devices.
11. The communication device according to claim 8, wherein determining that the terminal device in the communication system satisfies a handover condition comprises:
determining that the terminal device satisfies at least one of the following:
the received signal strength of the terminal device is lower than a first predetermined threshold strength;
the error rate of the terminal equipment is higher than a second preset threshold error rate; and
the retransmission rate of the terminal device is higher than a third predetermined threshold retransmission rate.
12. The communication device of claim 8, wherein determining current state information of the terminal device comprises:
determining the current position information of the terminal equipment; and
determining at least one of the following of the terminal device at the current location:
the current received signal strength of the terminal equipment;
the current error rate of the terminal equipment; and
and the current retransmission rate of the terminal equipment.
13. The communication device of claim 8, wherein selecting a target network device for the terminal device to handover to comprises:
determining, from the plurality of network devices, network devices that are adjacent to the terminal device as candidate network devices based on the current location; and
And determining the network device with the optimal transmission performance as a target node based on the transmission performance information of the candidate network device and the current state information.
14. The communication device of claim 8, the acts further comprising:
and updating the transmission performance information based on the current state information.
15. A communication apparatus in a Wireless Mesh Network (WMN), implemented at any network device, gateway device, or cloud for handoff, comprising:
means for obtaining transmission performance information for a plurality of network devices of a communication system, comprising: means for obtaining transmission environment information of a plurality of network devices, means for determining transmission performance information of the plurality of network devices based on the transmission environment information, and means for storing the transmission performance information of the plurality of network devices, the means for determining the transmission performance information of the plurality of network devices comprising:
means for determining, for a first network device of the plurality of network devices, a first location of a first terminal device connected to the first network device relative to the first network device;
means for determining at least one of a received signal strength of the first terminal device at a first location, a transmission error rate of the first terminal device, and a retransmission rate of the first terminal device; and
Means for determining a priority for the first terminal device to switch to other network devices of the plurality of network devices at the first location;
wherein the transmission environment information is obtained by periodically notifying the plurality of network devices, or the transmission environment information stored by the plurality of network devices is obtained by an accessible memory;
means for determining a terminal device in the communication system that satisfies a handover condition;
means for determining current state information of the terminal device, the current state information including current location information of the terminal device; and
and means for selecting a target network device to be handed over to from the plurality of network devices for the terminal device based on the location information and the transmission performance information.
16. The apparatus of claim 15, wherein the transmission environment information comprises at least one of: transmission information related to channels of the plurality of network devices and transmission information of terminal devices connected to the plurality of network devices.
17. The apparatus of claim 15, wherein the transmission performance information of the plurality of network devices comprises at least one of:
Location information of the plurality of network devices,
channel utilization of the plurality of network devices,
transmission error rates of the plurality of network devices
Retransmission rates of the plurality of network devices.
18. The apparatus of claim 15, wherein the means for determining the terminal device in a communication system that satisfies a handover condition comprises:
means for determining that the terminal device meets at least one of:
the received signal strength of the terminal device is lower than a first predetermined threshold strength;
the error rate of the terminal equipment is higher than a second preset threshold error rate; and
the retransmission rate of the terminal device is higher than a third predetermined threshold retransmission rate.
19. The apparatus of claim 15, wherein the means for determining current state information of the terminal device comprises:
means for determining the current location information of the terminal device; and
means for determining that the terminal device is at the current location at least one of:
the current received signal strength of the terminal equipment;
the current error rate of the terminal equipment; and
and the current retransmission rate of the terminal equipment.
20. The apparatus of claim 15, wherein the means for selecting a target network device from the plurality of network devices to which to hand-off for the terminal device comprises:
Means for determining, from the plurality of network devices, network devices that are adjacent to the terminal device as candidate network devices based on the current location; and
and means for determining a network device having an optimal transmission performance as a target node based on the transmission performance information of the candidate network device and the current state information.
21. The apparatus of claim 15, further comprising:
and means for updating the transmission performance information based on the current state information.
22. A computer readable medium having instructions stored thereon, which when executed by at least one processing unit of a machine, cause the machine to implement the method of any of claims 1-7.
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| CN113872791A (en) * | 2020-06-30 | 2021-12-31 | 虫极科技（北京）有限公司 | Network control method, store network system and computer readable storage medium |
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| CN102244908B (en) * | 2010-05-10 | 2015-10-21 | 北京三星通信技术研究有限公司 | The ambulant changing method of support terminal |
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| CN106454961B (en) * | 2015-08-07 | 2019-11-15 | 中国电信股份有限公司 | For the cell switching method of flexible bandwidth, system and equipment |
| CN107438276A (en) * | 2016-05-27 | 2017-12-05 | 西安中兴新软件有限责任公司 | A kind of control method and mobile terminal |
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