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967results about How to "Reduce conflict" patented technology

Access method for periodic contention-free sessions

An access method for periodic contention-free sessions (PCFS) reduces interference between overlapping first and second wireless LAN cells contending for the same medium. Each cell includes a respective plurality of member stations and an access point (AP) station. The access method for periodic contention-free sessions (PCFS) includes a fixed cycle time that reduces conflicts with PCFS from other cells. The PCFS from several cells are repeated in cycles of cycle period (CP), which is the contention-free period (CFP) of an access point times a factor that is a function of the number of overlapping cells. Periodic contention-free sessions (PCFSs) are generated, one from each overlapping cell. PCFS transmission attempts occur at the fixed specified time spacing following the start of the previous cycle. Each active AP sets a timer at CP and a PCFS is initiated when the timer expires. The timer is then reset to CP and this starts a new cycle. Contention transmissions are attempted by stations based on their assigned priority. If a channel is busy at the designated start time for transmitting a PCFS, the PCFS is shortened by the time lost. Interleaving PCFSs and CFSs reduces conflicts with CFSs from other cells. To lessen the contention between APs of different cells, each station's Network Allocation Vector (NAV) and Inter-BSS Network Allocation Vector (IBNAV) is updated by an increased value of the next CFS length, the increment being the inter-BSS contention period (IBCP). APs will attempt to access the channel during the IBCP only for transmitting a PCFS, while they will wait for the NAV and IBNAV expirations before attempting to transmit a CFS. Interleaving PCFSs and CFSs also enables maintaining quality of service (QoS).
Owner:AT&T INTPROP II L P

Fixed deterministic post-backoff for cyclic prioritized multiple access (CPMA) contention-free sessions

A cyclic prioritized multiple access (CPMA) method is disclosed which includes Fixed Deterministic Post-Backoff. Fixed deterministic post-backoff reduces conflicts between access points of overlapping cells. Contention-free sessions (CFSs) can be generated, one from each overlapping cell. Each active access point engages in a fixed deterministic post-backoff. A fixed deterministic backoff delay (Bkoff times a fixed number of idle time slots) is used by all access points, with the value of Bkoff being greater than the number of overlapping cells. The Bkoff should be large enough to enable the traffic that needs to be accommodated by the channel. Each access point has a backoff timer that is counted down using the shortest interframe space possible, typically the Priority Interframe Space (PIFS). A contention-free session (CFS) is initiated when the backoff timer expires, and it is then reset to the value of Bkoff to start a new cycle. A cycle is measured in terms of idle time slots instead of a fixed time interval. Contention-based transmissions can be attempted by an access point or other stations in the cell using their assigned priority while the access point is counting down its backoff timer. A new access point can get started and resolve possible collisions by a small random backoff. Subsequent contention-free sessions (CFSs) will not conflict, given an existing sequence of non-conflicting CFSs, since the follower access point's backoff delay exceeds that of the leader's by at least one times the fixed number of idle time slots. In this manner, contention-free sessions can be conducted without interference in the first and second cells.
Owner:AT&T INTPROP I L P

Staggered startup for cyclic prioritized multiple access (CPMA) contention-free sessions

A staggered startup method and system for a cyclic prioritized multiple access (CPMA) system reduce interference between overlapping first and second wireless LAN cells contending for the same medium. Each cell includes a respective plurality of member stations. A first member station in the first cell coordinates a periodic sequence of first contention-free sessions. Each contention-free session includes multiple bursts with other member stations in the first cell. The first member station retains control of the medium by using interframe spaces sufficiently short between the bursts so that the multiple bursts appear to contending stations to be a single instance of activity in the medium during a session until an end of a session. A second member station in the second cell listens to the activity in the medium and detects an end to one of the first contention-free sessions indicated by an interval longer than a PIFS idle interval following an end to the activity in the medium. The second member station then sets a post-backoff delay to periodically transmit a minimal interval after the first contention-free sessions of the first member station. The second member station coordinates in the second cell a periodic sequence of second contention-free sessions. In this manner, contention-free sessions are interleaved on a periodic basis in the first and second cells.
Owner:AT&T INTPROP I L P

Auto-allocation method of addresses of mobile ad hoc networks

An auto-allocation method of addresses of mobile ad hoc networks adopts an IP address stratified allocation mode based on neighbour proxy collision-free detection, address allocation information is provided with hereditary property; usable IP address control word which can become long is adopted to control the process of IP address allocation; the method comprises mobile ad hoc network address initialization configuration, an IP address auto-allocation protocol, an IP address allocation control process, an IP address trunking protocol, an IP address pool recover protocol, network merger and transformation and network partitioning and transformation; the invention adopts the IP address stratified allocation mode based on neighbour proxy collision-free detection, the address allocation information is provided with hereditary property, the usable IP address control word which can become long is adopted to flexibly control the allocation process of IP address space, thus effectively avoiding address allocation conflict, dispensing with address conflict detection, improving address allocation efficiency, reducing use of multicast or broadcast message in the process of address allocation, lowering resource consumption, and being applicable to allocation of IP addresses of multiple versions.
Owner:NANJING UNIV OF POSTS & TELECOMM

RFID management system for site construction worker safety

InactiveCN104700211ACrack liquidityCracking difficultyCo-operative working arrangementsResourcesWireless routerHand held
The invention discloses an RFID management system for site construction worker safety. The RFID management system comprises a pair of safety shoes, a safety helmet, a gate, a camera, a wireless router, an optical transmitter and receiver, an interchanger, a hand-held terminal, an intelligent terminal, a server, a PC and a television wall; the safety shoes, safety helmet, gate and hand-held terminal are connected in a wireless mode through an RFID mode; the hand-held terminal, intelligent terminal, gate and server are connected in a wireless mode; the interchanger, television wall, PC and server have communication connection; the camera is electrically connected with the wireless router and optical transmitter and receiver; the wireless router, optical transmitter and receiver and interchanger are electrically connected; the hand-held terminal comprises a violation information acquiring module, a violation processing module and a data updating module; the violation processing module is connected with the data updating module; the server comprises a management inquiry platform and a central service platform; the management inquiry platform is connected with the central service platform; the management inquiry platform comprises a verification module, a personnel registration module, an attendance inquiry module, a violation inquiry module and a user management module.
Owner:SHANGHAI JINNENG SAFETY TECH

Staggered startup for cyclic prioritized multiple access (CPMA) contention-free sessions

A staggered startup method and system for a cyclic prioritized multiple access (CPMA) system reduce interference between overlapping first and second wireless LAN cells contending for the same medium. Each cell includes a respective plurality of member stations. A first member station in the first cell coordinates a periodic sequence of first contention-free sessions. Each contention-free session includes multiple bursts with other member stations in the first cell. The first member station retains control of the medium by using interframe spaces sufficiently short between the bursts so that the multiple bursts appear to contending stations to be a single instance of activity in the medium during a session until an end of a session. A second member station in the second cell listens to the activity in the medium and detects an end to one of the first contention-free sessions indicated by an interval longer than a PIFS idle interval following an end to the activity in the medium. The second member station then sets a post-backoff delay to periodically transmit a minimal interval after the first contention-free sessions of the first member station. The second member station coordinates in the second cell a periodic sequence of second contention-free sessions. In this manner, contention-free sessions are interleaved on a periodic basis in the first and second cells.
Owner:AT & T INTPROP II LP

Method for implementing frequency spectrum cavity-pocket efficient utilization based on existing honeycomb communication signaling transmission

The invention discloses a method for realizing effective utilization of spectrum holes based on available cellular communication signaling, which is characterized in that the available cellular communication mode and the cognitive communication mode adopt a same clock source, a user terminal keeps the synchronization of the carrier frequency and the frame timing of the cognitive communication mode by locking on the carrier frequency and the frame timing of the available cellular communication mode. Signaling messages for allocating the frequency point, the bandwidth and the perceived spectrum holes of the cognitive communication mode are added in the available cellular communication signaling. A base station determines the cognitive manner including working parameters of the frequency, the bandwidth and the perceived spectrum holes based on the perception result, and notifies a terminal in time via the signaling of the available cellular communication mode. The terminal allocates the cognitive communication mode thereof according to the effective time. The perceived spectrum results interact among base stations, and the user terminal transmits and reports the perceived spectrum information to the base stations via the signaling of the available cellular communication mode. The method can effectively adopt cognitive radio technology in the radio cellular communication system, take full use of spectrum holes resource, and reduce possible conflicts with authorized users.
Owner:UNIV OF SCI & TECH OF CHINA +1
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