40results about How to "Improve time slot utilization" patented technology

The invention discloses a self-adaption adjustment method of contention windows in an 802.11e wireless network. A network load state is determined according to a network conflict rate via a wireless access point, and the contention windows are adjusted in a self-adaption mode according to the network load state. If the conflict rate is detected to be greater than a given threshold value, the access probability between an AP of current network load and an site is calculated in a multiplicative decrease mode according to an actual conflict rate value; if the conflict rate is detected to be smaller than or equal to the given threshold value, the access probability adapted for the current network load is calculated in a linear increase mode according to the actual conflict rate value. On this basis, an AP access probability is optimized according to the length of an AP current queue. Finally, the largest contention windows and the smallest contention windows between the AP and the site are respectively calculated according to the relations between the access probability and the contention windows. According to the method, the values of the contention windows can be adjusted in a self-adaption mode on the basis of network load conditions, so that the effective availability of a wireless channel is improved, network throughput is increased, and network delay is reduced.

The invention discloses an MAC access method based on a terahertz ultra-high-speed wireless network. The method includes the following steps that a Beacon1 frame is broadcasted by a PNC at the Beacon1 period; timeslot applications of DEVs are received by the PNC at the CAP period or SAP period; timeslots are distributed and distribution results are broadcasted by the PNC at the Beacon2 period; after a Beacon2 broadcast frame is received, data transmission is carried out in the timeslot, of each DEV of the CTA timeslot, in the CTAP time frame in the TDMA mode; afterwards, operation in the superframe is finished, and operation in the next superframe is carried out. The MAC access method based on the terahertz ultra-high-speed wireless network solves the problems of redundant control expenses and data transmission time delay of existing relevant MAC access methods and timeslot resource waste.

The invention discloses a method and device for realizing dynamic time slot allocation. The method includes: a server sorts the nodes that need to allocate time slots according to the dynamic priority table, and when each node has a burst of emergency traffic, according to the priority The level dynamically allocates time slots for each node; the server selects the appropriate sending time slot for each node according to the message length of the burst emergency traffic. The dynamic allocation time slot of the present invention is based on the dynamic priority table, and the server allocates the time slot to each network node according to the priority; at the same time, the appropriate time slot can be selected according to the length information of the message sent by each node and the time slot used by the node last time. The transmission time slot greatly improves the utilization rate of the time slot, and ensures the timely and effective communication of the data link emergency node information; it also meets the transmission needs of the node emergency message information, and solves the existing problems in the network in the prior art. When sending business flows, it cannot adapt to the problem of a network with a dynamically changing scale.

The invention provides a method for realizing a wireless ad hoc network. The wireless ad hoc network is used for dividing in-cluster and inter-cluster control information to different areas in a wireless frame structure. Furthermore a control area and a data area which are specialized for each broadcast service are divided in the wireless frame structure. The method realizes overall scheduling on different types of services with different priorities through a specific frame structure. Furthermore through reserving a specialized control resource area and a data resource area for the high-priority broadcast service, service priority insurance is realized.

The invention discloses a semi-structured transmission dispatching method orienting wireless sensor network data collection. The method is characterized by comprising the steps that 1, breadth-first search is carried out on a network communication graph, so that a slack semi-structured data collection route topological graph is constructed; 2, a link interference graph is constructed according to the main interference and subsidiary interference relation between transmission links in a network; 3, link weight interference factors are defined, so that the interference intensity caused to other links of the network from transmission loads of sending nodes and sending links is comprehensively weighed; 4, the dynamic link selection and time slot allocation strategy based on preference of the minimum weight is carried out; 5, a node dormant state is controlled in an explicit mode, and a data collection period is adjusted in a self-adaptive mode. According to the method, routing and dispatching are designed in a unified mode on the basis of a cross-layer design idea, the time slot utilization rate of dispatching is increased by fully utilizing the redundancy of a path, time delay of data collection is shortened, and the handling capacity of the network is improved. The method is applied to the wireless sensor network with the high requirement for the real-time property.

The invention provides an access method with high time slot utilization rate of an implicit TDMA based terahertz wireless personal area network. The access method is composed of operation of a PNC and a DEV within three circularly occurred sequential periods, including, Beacon, CAP and CTAP, and comprises four new mechanisms, including, multiple-super-frame oriented time slot partial distribution, twice-auditing based time slot distribution information perception, data frame continuous situation self-adaption announcement and an implicit TDMA based super-frame idle time slot distribution. The first new mechanism works in the Beacon and the CAP; the second new mechanism works in the CAP; the third novel mechanism works in the CTAP; and the fourth new mechanism works in the CAP and the CTAP. By allocating and using available time slots of the super-frame CTAP more adequately, the new method reduces waste of idle time slots, increases time used for time transmission in the super-frame, accordingly can improve the channel time slot utilization rate, can improve the network throughput and can reduce the end-to-end average time delay of the data.

The invention provides a time-varying inter-satellite link network topology planning method for a satellite navigation system. The overall design thought comprises: solving the inter-satellite link topology in each time slot in sequence; every time the inter-satellite link topology solution of one time slot is completed, updating the algorithm parameters so as to solve the inter-satellite link topology of the next time slot, performing global optimization after the inter-satellite link network topology solution of all the time slots is completed, and finally outputting the topology planning ofone link establishment period.

The invention provides a reliable Terahertz wireless personal area network access method with high time slot utilization. The method comprises the following step: dividing the network running time into multiple superframes with different lengths, wherein each superframe consists of three ordered time periods that are Beacon, CAP and CTAP. The method includes the following three new mechanisms:'multi-dimensional bidirectional subframe body extraction', 'PNC adaptively using CTA time slots based on monitoring" and 'dynamization of the number of subframe head fields', and all the new mechanisms work in the CTAP time period of the superframes. Through the steps of maximally extracting subframe bodies in standard aggregation frames from three dimensions and two directions, enabling the PNCto adaptively use the CTA time slot that is allocated to DEV but is not used when the PNC has data to be transmitted but does not have allocated time slots, and dynamically adjusting the number of the subframe head fields in the standard aggregation frames according to the actual number of the subframe heads, the new access method achieves the effects of improving the reliability and time slot utilization of data frame transmission as well as reducing control fields, and thus the success rate and throughput of the data frame transmission can be improved, and the control overhead and the average delay of data frames can be reduced.

The invention discloses a time slot distribution method based on a multi-factor priority in a body area network. The method comprises two parts of a multi-factor design and time slot distribution. The method comprises the following steps of firstly, through calculating a multi-factor weight, acquiring an initial time slot distribution sequence; secondly, considering node heterogeneity, through a time delay restriction, setting a priority and calculating maximum time delay of data after time slot distribution so as to distribute a high priority node time slot occupation number again; then, under the condition that a time slot has a residual amount, according to a descending order, distributing a low priority node time slot occupation number, and changing the priority into a high grade; and finally, in an original sequence, removing the low priority node time slot occupation number so as to acquire an optimal time slot distribution scheme. In the invention, a node can fully use the time slot; and under the condition that a packet loss ratio and an overflow rate are guaranteed, sensor node power consumption is minimum and a service life of the node is prolonged.

The invention discloses a time slot on-demand distribution method based on a business load of a self-organizing network, which is characterized by including steps of step (1), calculating current business load Mu of a node according to the node information, and acquiring competition probability pb of the node calculated by a multi-jump bayesian algorithm within a current competition time slot; step (2), calculating mixed competition probability pc of the node; step (3), actively starting the participation in the time slot competition by the mixed competition probability; step (4), judging thecompetition result; step (5), adjusting the competition probability pb in a previous competition cycle according to the multi-jump bayesian algorithm so as to obtain a new competition probability pb;then performing step (6); step (6): re-calculating the mixed competition probability pc to be new mixed competition probability pc according to the current business load Mu and the new competition probability pb of the node; replacing the mixed competition probability pc of the previous competition time slot by the new mixed competition probability pc, and circularly carrying out the treating processes of steps (3), (4), (5), and (6).

The invention discloses a hybrid MAC protocol optimization design method based on wireless optical communication, and the method comprises the steps: S1, enabling a Sink node to carry out the instruction wake-up of other nodes, enabling the other nodes to wake up at a random time, and starting to carry out the competition of a cluster head, and carrying out the preemption of a time slot; S2, entering a downlink transmission stage, performing relative positioning between nodes and cluster head updating tasks, and finishing downlink instruction transmission and cluster head updating tasks in each odd number of turns; and S3, entering an uplink stage, and performing time slot optimization in the delay tolerant network based on a time slot transfer mechanism of link quality evaluation. According to the time slot transfer mechanism based on link quality evaluation, time slot optimization in the delay tolerant network is carried out, and the time slot utilization rate of networking is improved.

The invention relates to a method and device for receiving data in parallel. The method comprises the steps of: periodically acquiring a volume of data which is to be sent by WiFi; periodically judging whether to start a parallel receiving function according to the volume of the data which is to be sent by WiFi; when starting the parallel receiving function in a current period, allocating work time slices to WiFi and BT (BlueTooth) according to a preset first ratio, wherein the preset first ratio is a ratio of the work time slices of WiFi to the work time slices of BT; and when closing the parallel receiving function in the current period, allocating the work time slices to the WiFi and BT according to a preset second ratio, wherein the preset second ratio is a ratio of the work time slices of WiFi to the work time slices of BT, and the preset first ratio is greater than the preset second ratio. By applying the method, the data can be received in parallel, so that a time slot utilization rate is improved.

The invention discloses a signal emitting and receiving method based on signal compression and extrapolation technology and an implementation device of the signal emitting and receiving method based on the signal compression and extrapolation technology, and relates to the field of communication. The signal emitting and receiving method based on the signal compression and extrapolation technology solves the problems that a system is low in slot time use rate and incapable of transmitting more signals in limited time. The method comprises the steps of forming an input sequence in a pulse mode, compressing the input sequence in a wave form mode, conversing the input sequence in a parallel-to-serial mode, filtering the input sequence, sending the input sequence through an antenna, receiving a wave form signal through an antenna by a receiving end, filtering the signal, converting the signal in a parallel-to-serial mode, sampling the signal, processing the signal in an extrapolation mode, and obtaining an input symbol sequence of a sending end. The implementation device comprises a sending unit and a receiving unit. The sending unit enables the signal to be compressed by a sending end parallel-to-serial converter, a pulse forming circuit and a time window circuit and sends the signal to an information channel through an original communication method. The receiving unit enables the received signal to pass a sampling circuit and an extrapolation circuit, obtains an extrapolated signal sequence, and obtains the input symbol sequence of the sending end through a receiving end judging device. The signal emitting and receiving method based on the signal compression and extrapolation technology is applicable to the field of communication.

The invention provides a dynamic time slot allocation access method for the networking of a frequency-hopping radio station. The method comprises the following steps of: networking, which comprises dividing an integrated frame into a statement sub-frame, an answering sub-frame and a data transmission sub-frame; dividing the sub-frames into N sub time slots according the number N of network nodes; and determining a main time slot of each node; time-slot division; service statement; service answering; decision making; and data transmission. In the method, alternative time slots of active nodes are allocated by adopting a priority strategy, so that the problems of a concealed terminal and an exposed terminal are avoided, and the utilization ratio of the time slots is increased.

The invention discloses a terminal-oriented TDMA two-stage time slot management method, and the method is used for the time slot management according to the type of customer terminals. The method comprises the steps: classifying the actual application demands of the customer terminals into a high-stage class, a middle-stage class and a low-stage class according to the delay sensitive degree, bandwidth demands and priority; dividing the time slot distribution of each customer terminal into a high stage, a middle stage and a low stage according to the bandwidth demands; dividing the time slot scheduling of each customer terminal into a high stage, a middle stage and a low stage according to the delay sensitive degree and the priority; dividing all connected customer terminals into a first stage polling queue and a second stage polling queue according to the priority and the delay sensitive degree; carrying out the polling of the above two polling queues through employing a two-layer polling system; and enabling the customer terminal meeting a predetermined condition to move to or to be removed from a non-active queue when the polling is finished. The method improves the time slot utilization rate, optimizes the waiting time of the customer terminals with the low delay demands, solves a conflict between the number of time slots and the polling frequency, and improves the task adaptability.

The invention provides a low-voltage power line communication local area network performance optimization method based on a dynamic game and belongs to the communication field. Thus, channel access parameters are adaptively changed, and throughput of the communication local area network of power line carrier waves, band width utilization rate and time slot utilization rate are increased. The method comprises steps of step 1, when a time slot of a low-voltage power line communication local area network is started, entering step 2; step 2, judging whether a channel is in an idle state through a node, if yes, entering step 3 and if not, selecting other channels and repeating the step 2; step 3, using the hidden Markov prediction algorithm to predict a decision result to the channel state by a completion node through the node, and acquiring active node number n participating in the channel competition; step 4, acquiring the optimal access probability p of the channel; and step 5, requiring for accessing the channel with the acquired optimal access probability p, if the access is successful, sending a data group to a target node with the access probability p under a non-symmetric channel environment through the node, and if the access is not successful, entering the step 2.

A bluetooth service scheduling method, device, equipment and computer-readable storage medium, the method comprises: according to different requirements of the bluetooth service on the occurrence time point, dividing the bluetooth service into a common type of service and a key type of service; The common type of service and the key type of service are set with priority parameters, and time slices are allocated; based on the set priority parameters and the allocated time slices, the common type of service and the key type of service are dynamically scheduled. By applying the above solution, the time slot utilization rate can be improved on the basis of meeting the time delay requirement of the Bluetooth service.

The invention discloses a time slot occupation method based on delay tolerance assessment in an optical communication network. The time slot occupation method comprises the following steps: S1, starting a current node CH0 time slot; S2, obtaining an LQI value and APT response time corresponding to each j through parallel processing according to the signaling interaction between the current node CH0 and the next hop node CHj, and calculating to obtain the delay tolerance from CH0 to CHj; S3, judging whether the delay tolerance is greater than or equal to a preset threshold T, if so, entering astep S4, and if not, entering a step S7; S4, enabling the current node CH0 to abandon the time slot uplink transmission opportunity, and inform surrounding adjacent CH nodes of occupying the time slotby using LED broadcast; S5, judging whether the delay tolerance 'of the adjacent CH node satisfies' (T), if so, entering a step S6, and if not, entering a step S8, S6, adopting a conflict back-off mechanism to compete the time slot by the surrounding adjacent CH nodes meeting the condition, S7, carrying out uplink data transmission by the CH node, and S8, entering a next time slot.

The invention discloses an automatic AIS report frequency management method, and particularly relates to the field of ship communication navigation. The method comprises an automatic AIS report frequency management system which comprises a dynamic information acquisition unit, a dynamic information analysis unit, a report frequency distribution unit and a ship report configuration unit. According to the AIS report frequency automatic management method provided by the invention, automatic management of ship report frequency in a complex sea area is realized, the time slot utilization rate is improved, and the potential safety hazard of ship collision is greatly reduced; wherein the method is realized under the existing AIS framework, meets the AIS standard requirements, and solves the problems of over-high channel load and serious time slot conflict in a complex sea area; thus, the utilization rate of the AIS channel in the sea area can be obviously improved, and a powerful guarantee is provided for the safety of ships in a large-scale port.

The invention discloses a hybrid time slot reservation method in a distributed TDMA protocol, which mainly solves the problem that it is difficult to guarantee the time delay requirement in the case of service load changes in a wireless ad hoc network. The solution is: assign fixed time slots to nodes to meet basic business needs; if the load is high and the fixed time slots are not enough, then reserve dynamic time slots; because the dynamic time slot reservation process takes more time, it is not conducive to sudden Therefore, when there is a high-load burst business, nodes use competition to occupy idle time slots, and introduce priority competition and reservation negotiation mechanisms to reduce competition conflicts. The present invention combines fixed time slot division, dynamic time slot reservation, and non-reserved burst transmission together, provides data transmission capability adaptive to load changes, ensures the stability of system time delay, and improves the time slot utilization rate. It can be used in the TDMA protocol of the mobile ad hoc network.

The invention discloses a MAC access method based on a terahertz ultra-high-speed wireless network, comprising steps: PNC broadcasts Beacon1 frame during Beacon1 period; PNC receives DEV time slot application during CAP period or SAP period; and PNC allocates during Beacon2 period After receiving the broadcast frame of Beacon2, the DEVs that have obtained the CTA time slot will perform data transmission in the form of TDMA in their respective time slots within the CTAP period; after that, this superframe ends and the cycle enters the next superframe . The method provides a MAC access method based on a terahertz ultra-high-speed wireless network that solves redundant control overhead, data transmission delay and time slot resource waste in existing related MAC access methods.

The invention discloses a hybrid MAC protocol optimization design method based on wireless optical communication, which includes S1 and Sink nodes waking up other nodes with instructions, and the other nodes wake up at a random time, and start election for cluster head and preemption S2, enter the downlink transmission stage, perform relative positioning between nodes and cluster head update tasks, and complete the task of transmitting downlink instructions and updating cluster heads in each odd round; S3, enter the uplink stage, based on link quality evaluation The time slot transfer mechanism is used to optimize the time slot in the delay-tolerant network. The invention optimizes the time slot in the delay-tolerant network based on the time slot transfer mechanism of the link quality evaluation, and improves the time slot utilization rate of the networking.

The invention belongs to the field of Terahertz wireless personal area networks and specifically relates to a time period reduction-based fair access method. The time period reduction-based fair access method can be used for mainly solving problems that a random access time period becomes redundant when a time slot request quantity is greater than a time slot quantity provided by two super frames via a relevant access method, that distributable time slots can hardly be completely distributed via a conventional fair access method, and that subsequent subframes are retransmitted unnecessarily via a conventional low time delay frame aggregation mechanism when length information of a subframe head is damaged; the method comprises operation of the following three time periods: beacon broadcast, data transmission and random access; in the beacon broadcast time period, the random access time period can be cancelled in a self-adaptive manner according to the size of the time slot request quantity, and time slots can be distributed to nodes in an ordered and fair way according to the size of the request quantity; in the data transmission time period, a frame aggregation mode is used for subjecting a subframe with maximum length to reverse aggregation operation, and therefore time slot utilization rates, network throughputs and data time delay performance can be improved while normal access to a Terahertz wireless personal area network can remain unaffected and node access fairness can be enuserd.

A method and device for receiving data in parallel. The method includes: periodically acquiring the amount of data to be sent by WiFi; periodically judging whether to start the parallel receiving function according to the amount of data to be sent by WiFi; Assign working time slices with BT, the preset first ratio is WiFi working time slices / BT working time slices; when the parallel receiving function is turned off in the current cycle, assign working time slices to WiFi and BT according to the preset second ratio , the preset second ratio is the working time slice of WiFi / the working time slice of BT, and the preset first ratio is greater than the preset second ratio. By applying the above method, data can be received in parallel and the utilization rate of time slots can be improved.

The invention provides a method for realizing a wireless ad hoc network. The wireless ad hoc network is used for dividing in-cluster and inter-cluster control information to different areas in a wireless frame structure. Furthermore a control area and a data area which are specialized for each broadcast service are divided in the wireless frame structure. The method realizes overall scheduling on different types of services with different priorities through a specific frame structure. Furthermore through reserving a specialized control resource area and a data resource area for the high-priority broadcast service, service priority insurance is realized.

The invention discloses a self-adaption adjustment method of contention windows in an 802.11e wireless network. A network load state is determined according to a network conflict rate via a wireless access point, and the contention windows are adjusted in a self-adaption mode according to the network load state. If the conflict rate is detected to be greater than a given threshold value, the access probability between an AP of current network load and an site is calculated in a multiplicative decrease mode according to an actual conflict rate value; if the conflict rate is detected to be smaller than or equal to the given threshold value, the access probability adapted for the current network load is calculated in a linear increase mode according to the actual conflict rate value. On this basis, an AP access probability is optimized according to the length of an AP current queue. Finally, the largest contention windows and the smallest contention windows between the AP and the site are respectively calculated according to the relations between the access probability and the contention windows. According to the method, the values of the contention windows can be adjusted in a self-adaption mode on the basis of network load conditions, so that the effective availability of a wireless channel is improved, network throughput is increased, and network delay is reduced.

The invention discloses a semi-structured transmission scheduling method for wireless sensor network data collection. It is characterized in that the method includes: 1) constructing a loose semi-structured data collection routing topology graph by performing breadth-first search on the network communication graph; 2) according to the main interference and secondary interference between transmission links in the network 3) Define the link weight interference factor to comprehensively weigh the transmission load of the sending node and the interference intensity caused by the sending link to other links in the network; 4) Dynamic link selection based on the minimum weight priority and time slot allocation strategy; 5) Explicitly controlled node sleep state and adaptively adjusted data collection period. The invention jointly designs routing and scheduling based on cross-layer design ideas, and enhances scheduling time slot utilization by making full use of path redundancy, thereby reducing data collection time delay and improving network throughput. The invention is suitable for the application of the wireless sensor network with higher requirements on real-time performance.

The invention discloses a cluster routing method based on hexagonal centroid-based cluster head election and dynamic time slot allocation in the technical field of wireless sensor networks, comprising the following steps: S1: establish a network model; S2: establish an energy consumption model; S3: cluster Head candidate node set; S4: Set the node sequence value; S5: Elect cluster head; S6: Based on variable-length time slot allocation, reduce node energy consumption from the perspectives of cluster head election and time slot allocation. According to the hexagonal grid, the nodes that are close to the hexagonal centroid are preferentially selected as cluster heads. The cluster head then allocates time slots according to the state of the node in the previous round of time frames to improve the utilization of time slots. Simulation data show that the proposed HSDR routing balances the energy consumption and extends the network lifetime.