248results about How to "Reduce control overhead" patented technology

A real-time modular video processing system (VPS) which can be scaled smoothly from relatively small systems with modest amounts of hardware to very large, very powerful systems with significantly more hardware. The modular video processing system includes a processing module containing at least one general purpose microprocessor which controls hardware and software operation of the video processing system using control data and which also facilitates communications with external devices. One or more video processing modules are also provided, each containing parallel pipelined video hardware which is programmable by the control data to provide different video processing operations on an input stream of video data. Each video processing module also contains one or more connections for accepting one or more daughterboards which each perform a particular image processing task. A global video bus routes video data between the processing module and each video processing module and between respective processing modules, while a global control bus provides the control data to / from the processing module from / to the video processing modules separate from the video data on the global video bus. A hardware control library loaded on the processing module provides an application programming interface including high level C-callable functions which allow programming of the video hardware as components are added and subtracted from the video processing system for different applications.

The present description relates to a method for a terminal to transmit uplink (UL) data in a wireless access system, comprising the following steps: receiving uplink resource allocation information for uplink data transmission from a base station via a downlink control channel, wherein the uplink resource allocation information includes resource block allocation information for each slot of a subframe and modulation and coding scheme (MCS) information; receiving, from the base station, sequence information allocated to each terminal so as to transmit uplink data through a code division multiplexing (CDM) scheme in cooperation with other terminals in a resource block pair region of the subframe; and transmitting uplink data to the base station through the resource block pair region in accordance with the received sequence information.

Receiver-initiated collision avoidance methods for use in ad-hoc wireless networks in which carrier sensing is available. A number of protocol variants are described including RIMA-SP (simple polling), RIMA-DP (dual-purpose polling), and RIMA-BP (broadcast polling). These handshake methods according to the invention are capable of correctly avoiding collisions within a network that contains hidden nodes, and the RIMA-DP protocol provides higher performance levels than attainable with existing handshaking protocols within the ad-hoc wireless networks. The use of dual-purpose polling allows a control packet to be sent which has alternative functions, such as requesting data from the polled node, if available, and if not available then providing a transmission request from the polling node to send data to the polled node.

The present description relates to an apparatus and method for receiving a control channel in a multi-component carrier system. The method for performing random access disclosed in the present description comprises the steps of: transmitting a random access preamble to a base station from an activated sub-serving cell; monitoring physical downlink control channel candidates during a response window one the basis of a certain aggregation in a temporary search space in a control region of the activated sub-serving cell, wherein the control region consists of a group of control channel elements; and adjusting an uplink time of the activated sub-serving cell according to a time advance command indicated by a random access response when the random access response, including a random access identifier corresponding to the random access preamble, is received in the response window.

The invention provides a method for activating and deactivating an auxiliary carrier in a dual carrier HSDPA, which comprises the following steps: judging whether a terminal is scheduled on a main carrier or an auxiliary carrier in a preset scheduling period; according to a judgment result, calculating a historical throughput rate on a priority queue; under the condition of reaching a scheduling period with a preset quantity, sampling historical throughput to obtain a maximum value; comparing the maximum value of the historical throughput and a preset threshold; and according to a comparison result, selectively activating and deactivating the auxiliary carrier or keeping the state of the auxiliary carrier unchanged. The invention also provides a device for activating and deactivating the auxiliary carrier in the HSDPA. The method and the device achieve the aim of activating and deactivating the auxiliary carrier timely for UE according to the load condition of the UE, also reduce additional network control overhead brought by HS-SCCH order transmission, save the power consumption of the UE and improve the transmission rate of the UE.

The present description relates to a method for a terminal to transmit uplink (UL) data in a wireless access system, comprising the following steps: receiving uplink resource allocation information for uplink data transmission from a base station via a downlink control channel, wherein the uplink resource allocation information includes resource block allocation information for each slot of a subframe and modulation and coding scheme (MCS) information; receiving, from the base station, sequence information allocated to each terminal so as to transmit uplink data through a code division multiplexing (CDM) scheme in cooperation with other terminals in a resource block pair region of the subframe; and transmitting uplink data to the base station through the resource block pair region in accordance with the received sequence information.

The invention discloses a downlink data transmission control method, a system and equipment in a time division duplex high-speed downlink packet access system, which reduce the control overhead of a base station and further improve the transmission capacity of the downlink data. The method which controls the transmission of the downlink data comprises the following steps: after initial transmission of a data packet is carried out to user equipment on a pre-appointed initial transmission code channel, confirmed feedback information after the user equipment correctly receives the data packet iswaited for being received on a initial transmission feedback channel corresponding to the pre-appointed initial transmission code channel; moreover, when the confirmed information is not received on the initial feedback channel, retransmission control information is sent to the user equipment on a control channel which is configured for the user equipment, and the data packet is retransmitted. The downlink data transmission control system comprises user equipment and a base station. The embodiment of the invention also discloses a base station and user equipment.

Receiver-initiated collision avoidance methods for use in ad-hoc wireless networks in which carrier sensing is available. A number of protocol variants are described including RIMA-SP (simple polling), RIMA-DP (dual-purpose polling), and RIMA-BP (broadcast polling). These handshake methods according to the invention are capable of correctly avoiding collisions within a network that contains hidden nodes, and the RIMA-DP protocol provides higher performance levels than attainable with existing handshaking protocols within the ad-hoc wireless networks. The use of dual-purpose polling allows a control packet to be sent which has alternative functions, such as requesting data from the polled node, if available, and if not available then providing a transmission request from the polling node to send data to the polled node.

The invention relates to a data aggregation method in a wireless sensor network, in particular to a tree-based and time-controlled data aggregation (TBTCDA) method in the wireless sensor network. Under the situation that information on a node position is undetermined, the data aggregation is performed to fulfill the aim of reducing network traffic and node energy consumption and balancing a contradiction between data aggregation accuracy and communication time delay. The method specifically comprises the following steps of: firstly, initializing a network; secondly, initiating a notice of establishing an aggregation tree by Sink; and finally, controlling aggregation time, data acquisition and aggregation, wherein the third step comprises the following steps of: 31) evaluating unit time delay Ta when all nodes participate in aggregation; and 32), setting Ta and the aggregation accuracy P according to an application demand, or receiving data acquired by Ci nodes by a cluster and transmitting aggregated data to a father cluster by a cluster head.

The invention discloses a wireless ad-hoc emergency communication network based on network cluster and message ferrying. The network comprises an emergency on-site command center (ECC), multiple emergency rescue special communication nodes (ECNs), a great quantity of ordinary communication nodes (OCNs) and a moderate number of ferrying nodes, wherein the ECC can be used as a command coordination node of the whole emergency communication network and a cluster node of the ECNs in the coverage area of the ECC; the ECNs can be used as cluster nodes of the OCNs in the coverage area of the ECNs; the cluster nodes and gateway nodes are interconnected to form wireless backbone networks (WBNs), the OCNs are connected with handy WBNs to which the OCN belong; and relay communication can be realized among the OCNs in different WBNs through the ferrying nodes. The communication network provided by the invention dynamically integrates the network cluster mechanism and the message ferrying mechanism, thus enhancing the reliability and timeliness of information delivery.

The invention provides a semi-static interference coordination method based on a virtual subdistrict and is suitable for a broadband honeycomb mobile communication system based on OFDMA. The method uses strong mutual interference characteristics between sectors in the virtual subdistrict, takes the virtual district as a basic interference coordination unit, and uses a soft frequency reuse method of an edge frequency bank and a center frequency band being orthometric between the sectors in the virtual subdistrict; the reuse factor frf<C>=1 of a component channel of the center district of each sector and the reuse factor frf<E> of the component channel of the edge district are determined according to the average verge of each sector in the virtual subdistrict and the duty factor of the center district; frf<E> is more than one; the component channel quantity allocation of the centre and the edge of each sector in the virtual subdistrict is determined according to the duty factor of the center and the edge of each sector and is adjusted along with load distribution variation of the virtual subdistrict; the same frequency interference received by the edge area of the sector is reduced by forward planning order of priority of the component channel.

The invention relates to a distributed topology control realization method for wireless sensor network based on double clustering, which comprises a physical clustering step and a virtual clustering step, wherein, the physical clustering step is determining the cluster head or cluster member status of each node, so as to form a physical cluster; the virtual clustering step adopts distributed competitive mode; the cluster head of the physical cluster can generate own cycle dispatch table or follow the cycle dispatch table which is generated by the adjacent cluster head, so that the cluster heads of the adjacent physical clusters can form a virtual clustering which is run periodically and slept synchronously, and the communication between the cluster heads can be realized through an adaptivecommunication mechanism. The invention aims at the characteristics of the wireless sensor network on energy limitation, application specificity, and random dense distribution of nodes; on the basis of meeting the specific QoS requirement, the network load balancing can be realized effectively; the network energy consumption efficiency can be enhanced and the life time of network system can be extended.

Embodiments of the present invention include a method and apparatus for reducing control signaling overhead in a hybrid wireless network. The method comprises receiving a wireless frame in the hybrid wireless network at a first terminal, and determining whether the received wireless frame is a control frame for a wireless channel reservation; if the received wireless frame is a control frame for the wireless channel reservation, reading by the first terminal a value of Duration field in control frame, and updating a timer for a channel reservation period in the first terminal with the value of Duration field, instead of updating network allocation vector of the first terminal; determining whether the remaining time of the timer for the channel reservation period is longer than the time required for transmitting the data frame or not before transmitting a data frame by the first terminal; and transmitting the data frame directly by the first terminal without transmission of a control frame for the wireless channel reservation if the remaining time is longer than the time required for transmitting the data frame.

The invention provides a mobile sensor network clustering method based on geographical position information. According to the method, firstly, a network is divided into a plurality of cells, a cluster head is selected according to the distance from a node in a cluster to the geometrical center of the cells, and the whole network is initialized. If the rest energy of the current cluster head is lower than the average rest energy of the nodes in the cluster, or the condition that the current cluster head leaves away from the range of the current cluster is judged, the cluster head is triggered to be updated. The cluster head updating is carried out in a mode of combining the rest energy, the moving speed and the moving direction. The mobile sensor network clustering method has the characteristics that the cluster covering region division and the initial cluster head selection is simple and convenient; the data fusion is favorably realized, and the energy consumption is reduced; the cluster head is selected from the aspects of the energy consumption level and the mobility of the nodes, and the cluster structure and the cluster stability are enhanced; the special clustering control sub groups are not needed, and the control expenditure is reduced.

A method of power saving for a wireless transceiver (FIGS. 1 and 2) is disclosed. The transceiver has an active power mode (504) and a reduced power mode (510). The transceiver is operated in the reduced power mode (510) and monitors transmissions from a remote wireless transmitter while in the reduced power mode. The transceiver identifies a transmission from in the remote wireless transmitter by a transceiver identity included in the transmission (FIG. 6, UE identification). The transceiver transitions to the active power mode (512) in response to identifying the transmission.

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.

A radio access system, and more particularly, a frame structure and a map structure are provided. A communication method includes transmitting an uplink sub-map to a receiver at a first downlink sub-frame included in a predetermined frame, and receiving data via a data burst indicated by the uplink sub-map at a first uplink sub-frame included in the predetermined frame. If the suggested sub-frame structure is used, it is possible to reduce HARQ ACK delay and HARQ retransmission delay.

The invention provides a method for reducing the spending of a control signal in a mixed wireless network. The method comprises the following steps: a first terminal receives a wireless frame in the mixed wireless network and judges whether the received wireless frame is the reserved control frame of a wireless channel or not; if the received wireless frame is the reserved control frame of the wireless channel, the first terminal reads the value of a duration time domain in the reserved control frame of the wireless channel, utilizes the value of the duration time domain to update a channel reserved-time timer of the first terminal and does not update the network distribution vector of the first terminal; before the first terminal transmits a data frame, the condition that whether the remaining time of the channel reserved-time timer is larger than time required for transmitting the data frame or not is judged; and when the remaining time of the channel reserved-time timer is larger than the time required for transmitting the data frame, the first terminal directly transmits the data frame and does not transmit the reserved control frame of the wireless channel.

The invention relates to an intelligent configuration system and an intelligent configuration method for a wireless sensor network. The system comprises a sensor network module, a gateway module, an output module, an execution module and an application layer interface module. The system and the method solve problems of poor adaptability, poor reliability and relatively great control cost existing in a device and a method of a traditional sensor network. The system and the method for the wireless sensor network have advantages of intelligent performance, strong robustness, good versatility and small control cost.

The invention discloses a low-congestion communication method and a router for realizing the shared path transmission of an optical network on chip. By the method and the router, the problem of serious network congestion caused by single wavelength communication in the Mesh structure of the conventional optical network on chip is mainly solved. The router provided by the invention comprises optical waveguides, broadband micro-ring resonators and narrowband micro-ring resonator groups, and is used for constructing an optical transmission network of a network on chip. In the communication method, the shared path transmission of a plurality of pairs of communication nodes is realized by utilizing a wavelength division multiplexing technology; judgment in path sharing and the allocation of wavelengths are executed by utilizing a conventional electric control network; when a link establishment packet is congested by the locking of an output port, the judgment in the path sharing may be executed, available wavelengths are allocated for the link establishment packet capable of sharing a path, and then the link establishment packet is continuously forwarded and a plurality of data packets perform the shared optical path transmission by using different communication wavelengths. By the method and the router, the multi-wavelength communication of the Mesh structure of the network on chip can be effectively supported, network congestion can be reduced, network overhead can be decreased and network performance can be improved.

The invention relates to the technical field of mobile communication channel coding, in particular to a method and a device for generating code rate compatible with quasi-cyclic low density parity check (LDPC) codes. The method comprises the following steps that: the degree distribution of high-code-rate quasi-cyclic LDPC codes and the low-code-rate requirement of a system are obtained, and the degree distribution of low-code-rate quasi-cyclic LDPC codes is designed; variable nodes to be expanded and check nodes to be resolved in the high-code-rate quasi-cyclic LDPC codes in the low-code-rate quasi-cyclic LDPC code constructing process are determined; check matrixes of the low-code-rate quasi-cyclic LDPC codes are constructed on the basis of a constructing method and the limitation of the low-code-rate quasi-cyclic LDPC codes on the check matrix check part structure; and the check bits of the obtained quasi-cyclic LDPC codes are interwoven, and then, code rate compatible codes are obtained through residue deletion. The embodiment of the invention also provides the device for implementing the method and provides hybrid automatic repeat request (HARQ) schemes based on the code rate compatible quasi-cyclic LDPC codes.

The invention discloses an efficient routing method of a high rate-wireless personal area network (HR-WPAN) mesh network and relates to routing technology based on topology servers in the WPAN mesh network. According to the routing method, broadcasting Link State Registration information, converging the Link State Registration information, shortening the length of relay node lists, releasing optimal path information through self-adaptive routing and a routing mechanism based on node dump energy are adopted, and the problems that the unicast control information of an existing routing method of the WPAN Mesh network based on the topology servers can not release network topology information sufficiently, the number, the content and the forwarding path of the control information are redundant, node energy is not considered in a routing process under the multi-path conditions and the like are solved. Control overload is reduced, path constructing time is shortened, node energy consumption is balanced, network bandwidth is saved, the efficiency of the routing method and the performance including time delay and the like are improved, and service life of the network is prolonged.

The invention discloses an opportunity network routing method based on a social utility degree mechanism, relating to the technical field of network routing and proposing an opportunity network routing method based on social utility degree for the social performance of node movement in the network. During the encounter time interval utility copy phase, a source node copies the message to the bestcandidate node according to the utility of its encounter history information with the candidate node. During the time-to-live replication phase, the node copies the message to the candidate node basedon the remaining lifetime of the message. During the social ranking replication phase, nodes are replicated based on utility rankings. The scheme considers the encounter time interval utility betweennodes, and selects nodes with better delivery potential to forward messages, thereby improving the delivery performance of the route. In addition, according to the social ranking utility of the node,the number of copies of the messages is dynamically allocated, so that the node with high utility assumes more forwarding tasks, thereby balancing network overhead.

It is provided a processor system comprising at least one processor core including a processor, a memory and an accelerator. The memory includes an instruction area, a synchronization flag area and a data area. The accelerator starts, even if the processor is executing another processing, acceleration processing and executes read instruction in a case where the read instruction is a flag checking instruction and a flag indicating the completion of predetermined processing has been written; and stores the data subjected to the acceleration processing after completion of the acceleration processing, and further writes a flag indicating the completion of the acceleration processing. The processor starts, even if the accelerator is executing another processing, read instruction corresponding to a flag in a case where the read instruction is the flag checking instruction and it is confirmed that the flag indicating the completion of the acceleration processing has been written.

The invention relates to an opportunistic network routing method based on incremental transmission of a packet index. The method comprises the following seven steps of a node non-meeting stage and a node meeting stage, wherein the node non-meeting stage comprises a step of: periodically broadcasting Hello messages; and the node meeting stage comprises the following six steps of: sensing node meeting; sending data packets of target nodes to opposite nodes; sending SV messages; sending request messages; sending and processing the data packets; and broadcasting the Hello messages as required. Through the method, only increment information of the packet index is sent in the process of sending index information of the data packets during node meeting, so that resource loss is reduced; the method can reduce delay from one end to another end of the data packets, and can reduce loss risk of the packets; the method does not need special control packets to realize distribution of data packet information which reaches the target nodes, and avoids redundant cost of globally broadcasting and periodically sending the control packets; and meanwhile, the method reduces storage cost by deleting the data packets reaching the target nodes.

The invention discloses a method for confirming a relay node in a corresponding relay cluster of a multihop relay network and a corresponding candidate relay node in the corresponding relay cluster of the multihop relay network. The method comprises the following steps: receiving instant channel state information from the corresponding candidate relay node to a node of a next stage of the relay cluster or a target node, which is fed back by the node of the next stage of the relay cluster of the corresponding relay cluster or the target node, by the corresponding candidate relay node in the corresponding relay cluster; and at least based on the received instant channel state information, determining whether to be used as a relay node of the corresponding relay cluster by the corresponding candidate relay node. According to the method, the control overhead and the computation complexity can be reduced.

The invention relates to a method for realizing wireless personal area network routing protocols based on ultra-wide band positioning assist, comprising the following steps of: firstly acquiring the coordinate of each node in a network by utilizing an ultra-wide band positioning technique, then carrying out flooding routing discovery with a limited range by using the nodes based on positioning information, updating routing request areas by utilizing the middle node receiving a routing querying message according to the recording position information of the node, and then selecting fan-shaped areas with dynamically regulated ranges in the routing request areas. The simulated and analyzed results show that compared with LAR (Location-Aided Routing) protocols, after carrying out node positioning with low node energy consumption and calculation and updating on the routing request areas, the invention reduces the overheads of routing control messages, shortens the end-to-end average time delay of data messages, and obviously improves effects.

An embodiment of the invention discloses a ring network label switch path creation method and associated devices and a communication system. The ring network label switch path creation method comprises the steps of enabling a first node to receive first Path information coming from a second node and used for creating a first label switch path; distributing first labels for the first label switch path; sending first Resv information carrying the first labels to the second node; and if the first node receives second Path information coming from the second node and used for establishing a second label switch path, a destination node of the second label switch path and a destination node of the first label switch path are the same and the first node, the second node and the destination node are positioned on an identical ring network, enabling the first node to distribute the first labels for the second label switch path, and sending second Resv information carrying the first labels to the second node. According to the technical scheme, the ring network label switch path creation method is favorable for reducing creation quantity and maintenance complexity of ring network label switch paths.

The invention discloses a distributed self-adaptive clustering method suitable for a self-organizing network, and aims to provide a distributed self-adaptive clustering method capable of reducing thenetwork control overhead and improving the network spectrum utilization rate and the network energy efficiency. The invention is realized through the following technical scheme: the method comprises the following steps: in a self-organizing network, each network node constructing an environmental perception module, a self-learning module and a self-decision-making function module which periodically carry out control information interaction with neighbor nodes according to a self-organizing network protocol; each network node receiving the clustering control information of the neighbor nodes through the wireless receiving unit by utilizing the capability of the wireless transmission module to interact the control information with the neighbor nodes in the control period of the node, and reporting the clustering control information of the neighbor nodes obtained by the wireless receiving unit to the environment sensing function module; and circularly executing a cluster head selection process, a cluster head replacement process, a cluster head switching process, a clustering fission process and a clustering combination process, and optimizing cluster head selection in real time.

The invention discloses an SDN (Software Defined Network)-based space-ground integrated adaptive dynamic QoS (Quality of Service) routing method. The method comprises the following steps of: establishing an SDN-based hierarchical clustering network model; establishing network resource mapping; and establishing a multi-constraint QOS adaptive routing algorithm SDN-AD. According to the method, the control overhead can be effectively reduced by reducing long-distance transmission and shortest distance clustering of the control packet, and the transmission efficiency is improved. According to the method, the multi-constraint QoS problem is formulated into the optimization problem with the minimum transmission cost as the target, the transmission cost of links of different types can be effectively calculated, and the difference between satellites of different levels and a ground network is shielded. The method can better adapt to network changes, so that services meeting different service quality requirements are provided. According to the invention, the optimization problem is solved, and self-adaptive routing is realized. The method provided by the invention has better performance in the aspects of overhead control, network service quality and algorithm convergence speed.