CN112566161B - WLAN target wake-up time scheduling method under deterministic channel access condition - Google Patents
WLAN target wake-up time scheduling method under deterministic channel access condition Download PDFInfo
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Abstract
The invention discloses a WLAN target wake-up time scheduling method, a system and equipment under the condition of deterministic channel access, which comprises the following steps of 1, obtaining a deterministic channel access scheme DCA based on broadcast TWT scheduling by combining the uplink multi-user simultaneous transmission characteristic and a broadcast TWT mechanism in the IEEE 802.11ax standard; the AP uses a centralized scheduling strategy of the station uplink data traffic statistical characteristics to find optimized parameter values of a first beacon frame transmission time (TBTT) and a Listening Interval (LI), and controls the number of simultaneously active stations according to the number of available sub-channels; 3. setting constraint conditions; the DCA channel access scheme corresponds the tree structure to the LI setting of the site, and the LI optimal value of the corresponding site is obtained by finding the tree structure according with the heuristic search algorithm; 5. and determining a wakeup time schedule of the station by adjusting the first TBTT parameter value based on the obtained LI value. The invention can provide higher throughput, RU utilization rate and energy efficiency.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a WLAN target wake-up time scheduling method under the condition of deterministic channel access.
Background
The next generation wlan standard proposes a broadcast target wake-up time (TWT) mechanism for new uplink multiuser simultaneous transmission characteristics. The broadcast TWT mechanism is scheduled with beacon frame transmission time instants (TBTTs) as preambles and wakes up to receive specific broadcast TWT service period parameter information contained in the beacon frame by determining the TBTT packet of each station. Meanwhile, the awakened stations can participate in the same TWT service period together, and uplink multi-user simultaneous transmission is realized by using different sub-channels, so that the overall network performance in a dense environment is improved.
In the uplink random access process of the IEEE 802.11ax standard, a station with a backoff counter of 0 randomly selects a channel for data transmission. For example, fig. 1 shows an exemplary broadcast TWT operation, showing an embodiment of random access to a channel. For example, at the 2 nd TBTT, only the STA1 wakes up and participates in channel contention after receiving the corresponding TWT SP information. During the subsequent first TWT service, however, there are two randomly accessible Resource Units (RUs). STA1 randomly selects RU2 for data transmission, and the rest of RU1 is idle, which results in a waste of resources to some extent. For another example, at the time of the 4 th TBTT, the STA1 and the STA2 simultaneously select the RU2 to transmit data, and a collision occurs, so that the data cannot be successfully received, and on the other hand, the RU1 is idle, which causes a waste of resources to some extent. Furthermore, at time 6 TBTT, three stations wake up simultaneously, and the total number of available RUs is two, which inevitably results in a collision. Therefore, collision is caused by resource over-competition in part of time, resource waste is caused by channel idle in part of time, and the problems of throughput rate and energy efficiency exist in random access. Collisions may occur when the number of competing stations exceeds the number of available RUs.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method, a system and equipment for scheduling a WLAN target wake-up time under a deterministic channel access condition, which can provide higher throughput, RU utilization rate and energy efficiency.
In order to realize the purpose, the invention provides the following technical scheme:
a method, a WLAN target wake-up time scheduling method under the condition of deterministic channel access, includes
1. Combining the characteristics of multi-user simultaneous transmission in the IEEE 802.11ax standard and a broadcast TWT mechanism to obtain a deterministic channel access scheme DCA based on broadcast TWT scheduling;
2, the AP uses a station uplink data traffic statistic characteristic centralized scheduling strategy to find an optimized first TBTT and interception interval (LI) parameter value, and controls the number of simultaneously active stations according to the number of available sub-channels;
3. setting constraint conditions;
the DCA channel access scheme corresponds the tree structure to the LI setting of the site, and the LI optimal value of the corresponding site is obtained by finding the tree structure according with the heuristic search algorithm;
5. and determining a wakeup time schedule of the station by adjusting the first TBTT parameter value based on the obtained LI value.
Further, the LI optimum value of each site is obtained by:
1. determining a tree structure for representing an LI scheduling result, wherein the tree structure comprises tree height and the out degree of a tree root;
2. determining the number of binary subtrees in the tree structure as the number of subchannels;
3. determining the tree structure of each binary subtree and distributing the sites to leaf nodes;
4. determining that the sites on each binary subtree use the same sub-channel;
5. determining the LI value of each leaf node corresponding to the site to be 2/-1And/represents the level height in the subtree where the site is located.
The specific constraint conditions include that the number of active sites and the out-degree of a tree root are constrained according to the number of the subchannels, the tree height and the LI of each site are constrained according to the data volume which can be transmitted and completed by each subchannel in a TWT service period, the necessary delay constraint is set according to the data packets cached by all the sites, and the LI of each site is constrained to be the LI value corresponding to the maximum tree height of the corresponding subtree.
Further, the optimal LI is obtained using a heuristic search algorithm including
1. According to the uplink data flow characteristics of the sites and the particularity of a TWT mechanism, the time delay characteristics of each site are obtained based on a Markov chain, an LI set usable by each site is established, leaf nodes meeting the conditions maximally are distributed to the corresponding sites, and the setting of an initial value of the site LI is completed;
2. setting an LI heuristic search process of each site, and setting an LI value of each site to be gradually reduced according to a target of maximizing throughput during heuristic search until all the sites accord with all corresponding constraints;
3. the optimal LI for all sites is obtained.
More specifically, the scheme of the invention can be applied to a network node system and a network node device.
As a further preference for the apparatus, the apparatus includes a housing, a fitting provided in the housing for fitting the disposer, a fixing member provided in the housing for fixing the fitting; the assembly part comprises a first fastener and a second fastener which are matched with each other, grooves for inserting the processor substrate are formed in the inner side surfaces of the first fastener and the second fastener, the first fastener and the second fastener are inserted into the grooves through inserting slots and inserting rods, locking parts are arranged on the first fastener and the second fastener, each locking part comprises a buckling rod and a spring, one end of each buckling rod is connected to the first fastener in a turnover mode, a convex block for buckling is arranged at the other end of each buckling rod, the springs are connected with the buckling rods, and the springs are in a stretching state; the slot is positioned on the second fastener, and the inserted link is positioned on the first fastener; the second fastener is also provided with a fastening groove matched with the fastening rod, and when the fastening rod is turned inside and outside relative to the first fastener, the fastening rod enters or leaves the fastening groove.
Furthermore, an assembly groove for installing a buckling rod is formed in the first fastener, a blind hole for installing a spring is further formed in the bottom of the assembly groove, one end of the spring is fixedly connected into the blind hole, and the other end of the spring is connected with the buckling rod; one end of the buckling rod is connected in the assembling groove in an inward and outward turnable mode through the plug, the other end of the buckling rod extends out of the assembling groove to be used for buckling, a buckling groove corresponding to the buckling rod is formed in the second fastener, the buckling groove corresponds to the portion, extending out of the assembling groove, of the buckling rod in shape, and when the first fastener and the second fastener are assembled with each other and the buckling rod turns inward and outward in the assembling groove, the buckling rod is embedded into or separated from the buckling groove.
Furthermore, the fixing part comprises a locking part used for being fixed with the first fastener and the second fastener and a radiating fin arranged on the locking part and used for being attached to the processor, a thermoelectric generation assembly is arranged at the position where the radiating fin is attached to the processor, the thermoelectric generation assembly is embedded in the radiating fin, one side of the thermoelectric generation assembly is attached to the surface of the processor, the thermoelectric generation assembly is electrically connected with a threshold indicating assembly so as to transmit power to the threshold indicating assembly, and the threshold indicating assembly sends out different threshold indications according to power parameters; the threshold indicating assembly is further connected with an electric energy storage assembly, the threshold indicating assembly transmits a power supply provided by the thermoelectric generation assembly to the electric energy storage assembly, the threshold indicating assembly comprises a plurality of groups of indicating lamp circuits which are connected in parallel with each other and connected with the thermoelectric generation assembly, each group of indicating lamp circuits consists of a pair of resistors which are connected in series and used for voltage division and light emitting diodes which are connected between the two resistors, the resistors which are connected in series between each group are different in voltage division level, the voltage values obtained by the light emitting diodes which are connected with the resistors are different, and two ends of each pair of resistors which are connected in series are respectively connected to the thermoelectric generation assembly and the ground; the electric energy storage assembly comprises a PNP triode, an NPN triode and an energy storage capacitor; the collector of the NPN triode is connected to the thermoelectric power generation assembly, the emitter of the NPN triode is connected with the collector of the PNP triode, the base of the PNP triode is connected with the serial node of the resistor with the minimum voltage level in the indicator lamp circuit, the anode of the energy storage capacitor is connected to the emitter of the NPN triode, and the cathode of the energy storage capacitor is grounded; and the emitter of the PNP triode is connected to an external part, and the base of the PNP triode is connected to a series node of the maximum resistor of the voltage-dividing stage in the indicator lamp circuit.
Furthermore, the locking piece comprises a base used for being assembled with the first fastener and the second fastener, and an assembly component used for installing the cooling fin; the first fastener and the second fastener are both semi-circular ring type, the first fastener and the second fastener form a ring shape after being assembled, corresponding threads are arranged on the outer side surfaces of the first fastener and the second fastener, and complete threads are formed after the first fastener and the second fastener are assembled with each other; the locking part is provided with a groove corresponding to the ring shape of the assembled first fastener and second fastener, the groove is internally provided with threads for assembling the first fastener and the second fastener, and the first fastener and the second fastener are assembled with the groove on the locking part in a threaded connection mode after being assembled; the assembling component comprises a hook piece for fixing the radiating fins, the hook piece is in a rake shape, one side of the hook piece is hinged with the base, and the other side of the hook piece is used for being matched with the lock catches of the radiating fins for installation.
The invention has the beneficial effects that:
1. the idle sub-channels in the channel competition can be fully utilized;
2. adjusting the number of sub-channels, increasing the matching degree of the sub-channels and the number of stations, and reducing collision;
3. reducing random access leads to a problem of low throughput.
Drawings
Fig. 1 is a diagram of an example of a conventional broadcast TWT operation;
FIG. 2 is a schematic flow diagram of the method of the present invention;
FIG. 3 is a schematic view of the first and second clasp assembly of the present invention;
FIG. 4 is a schematic view of the first and second clasp of the present invention from another perspective;
FIG. 5 is a schematic view of the retaining member of the present invention;
fig. 6 is a schematic diagram of the circuit structure of the indicator light of the present invention.
Reference numerals: 2. an assembly member; 21. a first fastener; 22. a second fastener; 23. a slot; 24. inserting a rod; 3. a fixing member; 4. a locking member; 41. a buckling rod; 42. a spring; 43. a bump; 44. buckling grooves; 45. assembling a groove; 46. a fastening groove; 51. a locking member; 52. a thermoelectric generation assembly; 53. a threshold indication component; 54. an electrical energy storage assembly; 6. and a hook member.
Detailed Description
The invention will be further described in detail with reference to the following examples, which are given in the accompanying drawings.
As shown with reference to figures 2-6,
a method for scheduling a WLAN target wake-up time under a deterministic channel access condition includes
1. Combining the characteristic of multi-user simultaneous transmission in the IEEE 802.11ax standard and a broadcast TWT mechanism to obtain a deterministic channel access scheme DCA based on broadcast TWT scheduling;
2, the AP uses a station uplink data flow statistical characteristic centralized scheduling strategy to find an optimized first TBTT and LI parameter value, and controls the number of simultaneously active stations according to the number of available sub-channels;
3. setting constraint conditions;
the DCA channel access scheme corresponds the tree structure to the LI setting of the site, and the LI optimal value of the corresponding site is obtained by finding the tree structure according with the heuristic search algorithm;
5. the schedule is determined by the constraints, the first TBTT and LI parameter values, and the LI optimal value for each site.
The AP centralized scheduling method finds out the optimized first TBTT and LI parameter values, can optimize in a primary access scheme, enables the scheme to keep high throughput from the beginning, enables the number of active stations at the same time not to exceed the number of usable sub-channels, and provides convenience for realizing efficient deterministic channel access in a subsequent TWT service period. The definition of the constraint condition can ensure the stability of the scheme and reduce the interference. And then, obtaining the LI optimal value of each station through a heuristic search algorithm, so that each station is convenient to schedule, and the optimal value obtained by utilizing the heuristic search mode can be compared and analyzed based on each constraint condition to obtain a better combination effect. After constraint conditions are met and the first TBTT and the optimal LI of each site are obtained, a scheduling table is determined, data exchange is carried out according to the scheduling rule of the scheduling table, the data throughput rate can be ensured to be at a high level, and resource waste is avoided; the problems of collision, idle and low throughput in the prior art are effectively avoided, and the phenomenon of reducing resource waste is obviously improved.
Specifically, LI per site is constrained by the following method:
1. determining a tree structure for representing an LI scheduling result, wherein the tree structure comprises tree height and the out degree of a tree root;
2. determining the number of binary subtrees in the tree structure as the number of subchannels;
3. determining the tree structure of each binary subtree and distributing the sites to leaf nodes;
4. determining that the sites on each binary subtree use the same sub-channel;
5. determining the LI value of each leaf node corresponding to the site to be 2/-1And/represents the level height in the subtree where the site is located.
The constraint is used for obtaining a preliminary LI interval and is used for preliminarily establishing association, LI scheduling results are expressed by using a scheduling tree firstly, so that the LI scheduling results can be clearer, rules can be found more conveniently by using the correspondence between the number of binary subtrees and the number of subchannel scheduling results, and the constraint condition of the final LI can be determined to be a power of 2 by using the correspondence between leaf nodes and sites and the constraint of LI values. Based on the constraint condition, the optimal listening interval can be preliminarily determined, and the interval bottom number is selected to be 2, so that the method can be suitable for most occasions.
And further setting more detailed constraint conditions, wherein the set constraint conditions comprise the constraint of the number of simultaneously active sites and the out-degree of a tree root according to the number of the sub-channels, the constraint of the tree height and the LI of each site according to the data volume which can be transmitted and completed by each sub-channel in one TWT service period, the setting of necessary delay constraint according to data packets cached by all the sites, and the constraint of the LI of each site to be the LI value corresponding to the maximum tree height of the corresponding sub-tree.
The number of active stations at the same time is constrained by the number of sub-channels, so that collision can be avoided, channel allocation is ordered, and energy efficiency can be increased by reducing collision; the data volume in one LI is restricted, so that packet loss can be avoided, the integrity of data is ensured, and time sequence disorder caused by delay exceeding due to incomplete transmission is avoided; time delay constraint is set, time sequence can be stabilized, whole data transmission is effectively transmitted, constraint LI can enable LI to be subjected to unified centralized management, difficulty in control caused by unmatched base numbers is avoided, and collision is caused.
The specific scheme of the heuristic search algorithm is as follows, wherein the heuristic search algorithm comprises
1. According to the statistics characteristics of uplink data flow of the sites and the particularity of a TWT mechanism, the time delay characteristics of each site are obtained based on a Markov chain, an LI set usable by each site is established, leaf nodes meeting the conditions maximally are distributed to the corresponding sites, and the setting of an initial value of the site LI is completed;
2. setting an LI heuristic search process of each site, and setting an LI value of each site to be gradually reduced according to a target of maximizing throughput during heuristic search until all the sites accord with all corresponding constraints;
3. the optimal LI for all sites is obtained.
According to the statistical characteristics of the uplink data flow of the station and the particularity of a TWT mechanism, time slot division of LI is established, and when the time slot division is small enough, only one data packet can be guaranteed to arrive in each time slot; establishing a corresponding number of states for the arrival of the station data packets at different time slots, determining the probability of each packet arriving at each different small time slot by constructing a state transition diagram based on a Markov chain, and obtaining the time delay estimation of each packet; determining the maximum LI of each site under the time delay constraint condition according to the obtained time delay characteristics, and determining a listening interval set meeting the time delay constraint condition; the initialization process is utilized to enable each station to select the maximum available LI as an initial value, so that the dormancy duration is prolonged and the minimum energy consumption is used; let the subsequent operation take the maximum value of each station listening interval set step by step, and certainly the value must be taken to meet the overall constraint condition in the scheduling tree until all the constraint conditions are met. The heuristic search algorithm is combined with the LI according to the increment rule and the constraint characteristic of the target, so that the optimal LI values of all stations can be obtained; and scheduling and determining an overall wakeup scheduling table of all the sites through the LI value and the first TBTT, and enabling all the sites to be in an efficient operation state by executing a wakeup rule of the scheduling table.
Based on the above method, a new embodiment can be constructed.
The method is constructed into specific algorithm software, and then a software module is completed to construct a network node system. The method of a software system can be adopted, so that the scheduling table can be generated quickly and is convenient to implement continuously.
Based on the above method, another embodiment can be constructed.
The software program is written into a processor, the processor can automatically execute the software constructed by the method, all required parameters are obtained and analyzed by matching with other processors or other software programs in the processor, a scheduling table is generated according to the software program, the processor is enabled to carry out efficient processing, the network node equipment is enabled to distribute channels more efficiently, and data interaction is enabled to be more efficient.
As a further improvement of the network node device, the device comprises a shell, a mounting part 2 arranged in the shell and used for mounting a processor, and a fixing part 3 arranged in the shell and used for fixing the mounting part 2; the assembly part 2 comprises a first fastener 21 and a second fastener 22 which are matched with each other, grooves for inserting and connecting a processor substrate are formed in the inner side faces of the first fastener 21 and the second fastener 22, the first fastener 21 and the second fastener 22 are inserted and connected through a slot 23 and an insertion rod 24, locking parts 4 are arranged on the first fastener 21 and the second fastener 22, each locking part 4 comprises a buckling rod 41 and a spring 42, one end of each buckling rod 41 is connected to the first fastener 21 in a turnover mode, a convex block 43 for buckling is arranged at the other end of each buckling rod 41, the springs 42 are connected with the buckling rods 41, and the springs 42 are in a stretching state; the slot 23 is positioned on the second fastener 22, and the inserted rod 24 is positioned on the first fastener 21; the second fastening member 22 is further provided with a fastening groove 44 engaged with the fastening rod 41, and when the fastening rod 41 is turned inside and outside relative to the first fastening member 21, the fastening rod 41 enters or leaves the fastening groove 44.
Carry out the mode of pegging graft with first fastener 21 and second fastener 22 and carry out preliminary installation to the treater, through setting up the recess, can let the fixed more firm of base plate of treater to utilize inserted bar 24 and slot 23 to fix a position and peg graft, the in-process that can avoid preliminary installation appears the recess and does not aim at and lead to the treater damage. And through the buckling rod 41 and the catching groove 44 matched with the buckling rod, the buckling rod 41 can be tightly connected and positioned with the catching groove 44 under the action of the spring 42, so that the first fastener 21 and the second fastener 22 can be stably buckled, the length of the lug 43 can be set to be greater than the depth of the catching groove 44, at the moment, under the action of the spring 42, the lug 43 can be used for extruding the catching groove 44, the second fastener 22 and the first fastener 21 are attached more tightly in the vertical direction, and certain vibration influence is reduced.
In a further arrangement, an assembly groove 45 for installing a fastening rod 41 is arranged on the first fastener 21, a blind hole for installing a spring 42 is further arranged at the bottom of the assembly groove 45, one end of the spring 42 is fixedly connected in the blind hole, and the other end of the spring 42 is connected with the fastening rod 41; one end of the buckling rod 41 is connected in the assembling groove 45 in an inward-outward turnable manner through a plug, the other end of the buckling rod 41 extends out of the assembling groove 45 for buckling, a buckling groove 46 corresponding to the buckling rod 41 is formed in the second fastener 22, the shape of the buckling groove 46 corresponds to that of the part of the buckling rod 41 extending out of the assembling groove 45, and when the first fastener 21 and the second fastener 22 are assembled with each other and the buckling rod 41 is turned in the assembling groove 45 in an inward-outward turnable manner, the buckling rod 41 is embedded in or separated from the buckling groove 46. Through setting up assembly slot 45, the cramp pole 41 can hide in assembly slot 45 this moment, when installing the treater on the circuit board, and the cramp pole 41 just can not increase the installation degree of difficulty because of its own thickness.
In order to improve the electric energy recovery and the resource utilization, a feasible but not exclusive improvement is provided as follows, the fixing member 3 comprises a locking member 51 used for fixing with the first fastening member 21 and the second fastening member 22, and a heat sink mounted on the locking member 51 and used for jointing with the processor, the position where the heat sink is jointed with the processor is provided with a thermoelectric generation component 52, the thermoelectric generation component 52 is embedded in the heat sink, and one side of the thermoelectric generation component is jointed with the surface of the processor, the thermoelectric generation component 52 is electrically connected with a threshold value indicating component 53 to transmit power to the threshold value indicating component 53, and the threshold value indicating component 53 sends out different threshold value indications according to the power supply parameters; the threshold indicating assembly 53 is further connected with an electric energy storage assembly 54, the threshold indicating assembly 53 transmits a power supply provided by the temperature difference generating assembly 52 to the electric energy storage assembly 54, the threshold indicating assembly 53 comprises a plurality of groups of indicating lamp circuits which are mutually connected in parallel and connected with the temperature difference generating assembly 52, each group of indicating lamp circuits consists of a pair of resistors which are connected in series and used for voltage division and light emitting diodes which are connected between the two resistors, the voltage division levels of the resistors which are connected in series between each group are different, the voltage values obtained by the light emitting diodes which are connected with the pair of resistors are different, and two ends of each pair of resistors which are connected in series are respectively connected to the temperature difference generating assembly 52 and the ground; the electric energy storage component 54 comprises a PNP triode, an NPN triode, and an energy storage capacitor; the collector of the NPN triode is connected to the thermoelectric generation component 52, the emitter of the NPN triode is connected with the collector of the PNP triode, the base of the PNP triode is connected with the series node of the resistor with the minimum voltage level in the indicator lamp circuit, the anode of the energy storage capacitor is connected to the emitter of the NPN triode, and the cathode of the energy storage capacitor is grounded; and the emitter of the PNP triode is connected to an external part, and the base of the PNP triode is connected to a series node of the maximum resistor of the voltage-dividing stage in the indicator lamp circuit.
The first fastener 21 and the second fastener 22 are further fixed by the locking member 51, so that the pre-assembly of the processor can be more stable, and the processor can be mounted on a circuit board once after the pre-assembly is completed. In addition, the temperature of the processor can be maintained at a proper value for normal operation through the cooperation of the heat sink and the processor. The temperature difference generating component 52 is arranged at the position where the radiating fin is attached to the processor, the temperature difference between the temperature of one end of the radiating fin and one end of the processor, which is opposite to the processor, and the temperature of the side of the radiating fin, which is opposite to the processor, is subjected to rapid temperature reduction, in addition, the threshold value indicating component 53 is used for carrying out threshold value judgment on the electric energy generated by the temperature difference generating component 52, the working temperature of the processor can be fed back according to the electric energy condition generated by the temperature difference generating component 52, the radiating fin is kept rapidly cooled, the side attached to the processor is represented as the working temperature of the processor, the larger the temperature difference is, the larger the electric energy generated by the temperature difference generating component 52 is, and the electric energy conditions of different threshold values are indicated by utilizing a plurality of groups of indicating lamp circuits which are connected in parallel, specifically as follows, the indicating lamp circuit is formed by two resistors which are connected in series, generally, the resistance value of the resistor is larger, the consumption of electric energy on the resistor is reduced, the actual electric energy value can be calculated by obtaining the voltage of a serial node between two resistors, each group of indicator light circuits are set into circuits for detecting threshold values in a discrete component mode by setting each group of indicator light circuits into different voltage division levels, the electric energy obtained at the serial node is obtained at the moment, the electric energy of the node exceeds the lighting requirement of the light-emitting diode, the light-emitting diode emits light, the lighting threshold value of each indicator light circuit can be set by controlling the voltage division level of the serial node to be matched with the lighting requirement of the light-emitting diode, different indication conditions are further shown, two triodes are simultaneously arranged, namely a PNP triode and an NPN triode, wherein the base electrode of the PNP triode is connected to the lowest serial node of the voltage division levels, and the PNP triode can be firstly conducted at the moment, and then let thermoelectric generation subassembly 52's electric energy can transmit and carry out the energy storage on the energy storage electric capacity, because the one-way effect that switches on of triode, can let the electric energy on the energy storage electric capacity can not flow backward, therefore even the electric energy on the energy storage electric capacity is greater than the electric energy that thermoelectric generation subassembly 52 produced this moment, the condition that the energy storage electric capacity carried the electric energy to thermoelectric generation subassembly 52 can not appear yet, avoid the energy extravagant, but can ensure again when thermoelectric generation subassembly 52's electric energy is greater than the electric energy on the energy storage electric capacity, the very first time adopts minimum partial pressure level series node to switch on the triode, can let the electric energy carry the storage. In addition, the maximum voltage division level series node is connected with the base electrode of the NPN triode, at the moment, under the condition of large temperature difference, the NPN triode can be cut off through the electric energy provided by the maximum voltage division level series node, and further the electric energy of the energy storage capacitor is prevented from being output outwards, at the moment, the charging efficiency is favorably ensured, at the moment, the electric energy of the temperature difference power generation component 52 can also be supplied to the outside through the electric energy, at the moment, the charging and the normal power supply can be realized, when the electric energy output by the temperature difference power generation component 52 is reduced, the electric energy provided by the maximum voltage division level series node is not enough to cut off the NPN triode, at the moment, the NPN triode is conducted, and further, the electric energy output by the temperature difference power generation component 52 is supplemented by utilizing the energy storage capacitor receiving point, the electric energy can be reduced more gently, and the transition of electric equipment is ensured.
In a further arrangement, the retaining member 51 includes a base for mounting with the first and second retaining members 21, 22, a mounting assembly for mounting a heat sink; the first fastener 21 and the second fastener 22 are both semi-circular ring type, the first fastener 21 and the second fastener 22 form a ring shape after being assembled, and corresponding threads are arranged on the outer side surfaces of the first fastener 21 and the second fastener 22, and form complete threads after being assembled with each other; the base is provided with a groove corresponding to the ring shape of the assembled first fastener 21 and second fastener 22, the groove is internally provided with threads for assembling the first fastener 21 and second fastener 22, and the assembled first fastener 21 and second fastener 22 are assembled with the groove on the base in a threaded connection mode; the assembling component comprises a hook piece 6 used for fixing the radiating fins, the hook piece 6 is in a rake shape, one side of the hook piece is hinged with the base, and the other side of the hook piece is used for being matched with the lock catches of the radiating fins for installation.
The first fastener 21 and the second fastener 22 are assembled in a threaded connection mode through the annular groove, the processor can be reinforced and installed again after the first fastener 21 and the second fastener 22 are used for positioning and assembling the processor, and the installation mode is simple. After the assembly of the both, the assembly can be performed by using the locking member 51 to assemble with the circuit board or providing a part for the assembly with the circuit board on the first fastening member 21 and the second fastening member 22. Wherein the fin is installed through assembly subassembly and base, sets up on this fin and colludes 6 complex rings for the cooperation installation of piece 6 is colluded in the provision, and the ring on the fin lets collude and can fix after 6 collude, through setting up more colluding 6 and rings, can let whole inseparable lock joint. In addition, collude 6 and become the rake form to articulated with the base, this articulated mode can be carried and let collude 6 and have certain activity space, and it is more convenient to let the installation, when setting up a plurality of colluding 6, when a plurality of colluding 6 and catch on corresponding ring simultaneously, collude 6 and ring and be in the state of straining under the tension effect, and then provide stable fixed effect, consequently also can not weaken fixed effect when providing the effect of easy to assemble.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and all technical solutions that belong to the idea of the present invention belong to the scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (7)
1. A WLAN target wake-up time scheduling method under the condition of deterministic channel access is characterized in that: comprises that
Combining the characteristic of multi-user simultaneous transmission in the IEEE 802.11ax standard and a broadcast TWT mechanism to obtain a deterministic channel access scheme DCA based on broadcast TWT scheduling;
the AP uses a centralized scheduling strategy of station uplink data traffic statistical characteristics to find optimized parameters of a first beacon frame transmission time TBTT and an interception interval LI, and controls the number of simultaneously active stations according to the number of available sub-channels;
setting constraint conditions;
the DCA channel access scheme corresponds the tree structure to the LI setting of the site, and the LI optimal value of the corresponding site is obtained by finding the tree structure according with the heuristic search algorithm;
determining a wakeup time schedule table of the station by adjusting the first TBTT parameter value based on the obtained LI value;
LI per site is constrained by the following method:
determining a tree structure for representing an LI scheduling result, wherein the tree structure comprises tree height and the out degree of a tree root;
determining the number of binary subtrees in the tree structure as the number of subchannels;
determining the tree structure of each binary subtree and distributing the sites to leaf nodes;
determining that the sites on each binary subtree use the same subchannel;
determining the LI value of each leaf node corresponding to the site to be 2 l-1 ，lRepresenting the level height of a subtree in which the site is positioned;
the set constraint conditions comprise that the quantity of sites which are simultaneously active and the out-degree of a tree root are constrained according to the quantity of sub-channels, the height of a tree and the LI of each site are constrained according to the quantity of data which can be transmitted and finished by each sub-channel in a TWT service period, the necessary time delay constraint is set according to data packets cached by all the sites, and the LI of each site is constrained to be an LI value corresponding to the maximum tree height of a corresponding sub-tree;
the heuristic search algorithm comprises
According to the uplink data flow characteristics of the sites and the particularity of a TWT mechanism, the time delay characteristics of each site are obtained based on a Markov chain, an available LI set of each site is established, the largest eligible leaf nodes are distributed to the corresponding sites, and the setting of an initial value of the LI of the site is completed;
setting an LI heuristic search process of each site, and setting an LI value of each site to be gradually reduced according to a target of maximizing throughput during heuristic search until all the sites accord with all corresponding constraints;
the optimal LI for all sites is obtained.
2.A network node system, characterized by: comprising a software module constructed using the method of claim 1.
3. A network node device, characterized by: a processor comprising software constructed using the method of claim 1.
4. The apparatus of claim 3, wherein: comprises a shell, an assembly part (2) arranged in the shell and used for assembling a processor, and a fixing part (3) arranged in the shell and used for fixing the assembly part (2); the assembly part (2) comprises a first fastener (21) and a second fastener (22) which are matched with each other, grooves for inserting a processor substrate are formed in the inner side faces of the first fastener (21) and the second fastener (22), the first fastener (21) and the second fastener (22) are inserted through inserting grooves (23) and inserting rods (24), locking parts (4) are arranged on the first fastener (21) and the second fastener (22), each locking part (4) comprises a buckling rod (41) and a spring (42), one end of each buckling rod (41) is connected to the first fastener (21) in a turnover mode, a convex block (43) for buckling is arranged at the other end of each buckling rod (41), the springs (42) are connected with the buckling rods (41), and the springs (42) are in a stretching state; the slot (23) is positioned on the second fastener (22), and the inserted rod (24) is positioned on the first fastener (21); the second fastener (22) is also provided with a buckling groove (44) matched with the buckling rod (41), and when the buckling rod (41) is turned inside and outside relative to the first fastener (21), the buckling rod (41) enters or leaves the buckling groove (44).
5. The apparatus of claim 4, wherein: an assembly groove (45) for installing a buckling rod (41) is formed in the first fastener (21), a blind hole for installing a spring (42) is further formed in the bottom of the assembly groove (45), one end of the spring (42) is fixedly connected into the blind hole, and the other end of the spring is connected with the buckling rod (41); one end of the buckling rod (41) is connected in the assembling groove (45) in an inward-outward overturning mode through the plug bolt, the other end of the buckling rod extends out of the assembling groove (45) to be used for buckling, a buckling groove (46) corresponding to the buckling rod (41) is formed in the second fastener (22), the buckling groove (46) corresponds to the part, extending out of the assembling groove (45), of the buckling rod (41) in shape, and when the first fastener (21) and the second fastener (22) are assembled with each other and the buckling rod (41) overturns inward and outward in the assembling groove (45), the buckling rod (41) is embedded into or separated from the buckling groove (46).
6. The apparatus of claim 5, wherein: the fixing piece (3) comprises a locking piece (51) used for being fixed with the first fastener (21) and the second fastener (22) and a radiating fin arranged on the locking piece (51) and used for being attached to a processor, a thermoelectric generation assembly (52) is arranged at the position where the radiating fin is attached to the processor, the thermoelectric generation assembly (52) is embedded in the radiating fin, one side of the thermoelectric generation assembly is attached to the surface of the processor, the thermoelectric generation assembly (52) is electrically connected with a threshold indicating assembly (53) so as to transmit power to the threshold indicating assembly (53), and the threshold indicating assembly (53) sends out different threshold indications according to power parameters; the threshold indicating component (53) is further connected with an electric energy storage component (54), the threshold indicating component (53) transmits a power supply provided by the temperature difference power generation component (52) to the electric energy storage component (54), the threshold indicating component (53) comprises a plurality of groups of indicator light circuits which are connected in parallel with each other and connected with the temperature difference power generation component (52), each group of indicator light circuits consists of a pair of resistors which are connected in series and used for voltage division and light emitting diodes which are connected between the two resistors, voltage division levels of the resistors which are connected in series and used for voltage division between each group are different, voltage values obtained by the light emitting diodes which are connected with the pair of resistors are different, and two ends of each pair of resistors which are connected in series are respectively connected to the temperature difference power generation component (52) and the ground; the electric energy storage component (54) comprises a PNP triode, an NPN triode and an energy storage capacitor; the collector of the NPN triode is connected to the temperature difference power generation assembly (52), the emitter of the NPN triode is connected with the collector of the PNP triode, the base of the PNP triode is connected with the series node of the resistor with the minimum voltage division level in the indicator lamp circuit, the positive electrode of the energy storage capacitor is connected to the emitter of the NPN triode, and the negative electrode of the energy storage capacitor is grounded; and the emitter of the PNP triode is connected to an external part, and the base of the PNP triode is connected to a series node of the maximum resistor of the voltage-dividing stage in the indicator lamp circuit.
7. The apparatus of claim 6, wherein: the locking piece (51) comprises a base for assembling with the first fastener (21) and the second fastener (22) and an assembling component for installing a cooling fin; the first fastener (21) and the second fastener (22) are both semi-circular ring type, the first fastener (21) and the second fastener (22) form a ring after being assembled, corresponding threads are arranged on the outer side faces of the first fastener (21) and the second fastener (22), and complete threads are formed after the first fastener (21) and the second fastener (22) are assembled with each other; the base is provided with a groove corresponding to the ring shape of the assembled first fastener (21) and second fastener (22), the groove is internally provided with threads for assembling the first fastener (21) and second fastener (22), and the assembled first fastener (21) and second fastener (22) are assembled with the groove on the base in a threaded connection mode; the assembling component comprises a hook piece (6) used for fixing the radiating fins, the hook piece (6) is in a rake shape, one side of the hook piece is hinged with the base, and the other side of the hook piece is used for being matched with the locking buckle of the radiating fins for installation.
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