246results about How to "Reduce control overhead" patented technology

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 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.

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.

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 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 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.