Patent application number | Description | Published |
20080205352 | COMMUNICATION BETWEEN OVERLAPPING WRAN CELLS WORKING IN DIFFERENT CHANNELS - A common control channel for base station (“BS”)/consumer premise equipment (“CPE”) communication in areas of overlapping coverage by wireless regional area network (“WRAN”) cells operating on different working channels is disclosed. A common control channel is selected from among the various working channels sensed in each of a plurality of overlapping WRAN cells so as to enable BS/CPE and BS/BS communication. Once chosen, each CPE within the overlapping area communicates with the controlling BS via an enhanced coexistence beacon protocol messages. These messages include timing and other synchronization information. | 08-28-2008 |
20080205487 | CLEAN SENSING FOR DYNAMIC FREQUENCY HOPPING IN DYNAMIC SPECTRUM ACCESS NETWORKS - Clean and reliable channel sensing during dynamic frequency hopping over a plurality of overlapping wireless regional area network (WRAN) cells is conducted using a minimum number of channels. By coordinating a phase-shift of the operation periods of each WRAN cell over a minimum number of working channels, interruption-free communication and data transmission for each of the WRAN cells as well as interference-free channel sensing can be achieved. | 08-28-2008 |
20080207204 | RADIO FREQUENCY ARCHITECTURE FOR SPECTRUM ACCESS NETWORKS - Radio frequency (RF) architectures for spectrum access networks are provided. Embodiments of the invention generally provide a radio frequency (RF) architecture for customer premise equipment (CPE) for use in, for example, IEEE 802.22 wireless regional area networks (WRANs). In some embodiments, the CPE RF architecture includes two receive chains with a directional antenna and an omni-directional antenna, respectively. The CPE RF architecture facilitates opportunistic out-of-band spectrum sensing and WRAN signal receiving that are performed in parallel with data transmission. | 08-28-2008 |
20080279165 | MULTI-CHANNEL INTER BASE-STATION COMMUNICATION - The invention relates generally to communication systems and in particular to radio frequency (RF) architectures. Some embodiments of the invention are directed towards a multi-channel inter-BS communication system. The multi-channel inter-BS communication system includes a plurality of co-existing wireless regional area network (WRAN) cells, wherein each of the plurality of co-existing WRAN cells includes a plurality of data frames and at the end of each of the plurality of data frames is a slotted co-existence window. Additional embodiments of the invention include CB frames, fixed-slot host scheduling and modulo scheduling. | 11-13-2008 |
20080285525 | INTER-CELL DISCOVERY AND COMMUNICATION USING TIME DIVISION MULTIPLE ACCESS COEXISTENCE BEACONING PROTOCOL - A self-coexistence window reservation protocol for a plurality of Wireless Regional Area Network (WRAN) cells operating in a WRAN over a plurality of channels includes a sequence of self-coexistence windows that uniquely identifies a transmission period for each WRAN cell. A self-coexistence window reservation protocol is included within the first packet of a Coexistence Beaconing Protocol period identifying when each WRAN cell associated with a particular channel will transmit. When not actively transmitting, a WRAN cells remains in a passive, receiving mode to accept data. As the transmissions of each WRAN cell operating on a particular channel are scheduled, contention for a transmission period is eliminated. | 11-20-2008 |
20080298310 | CROSS CHANNEL COEXISTENCE BEACONING PROTOCOL FOR WIRELESS DYNAMIC SPECTRUM ACCESS NETWORKS - A wireless system including a plurality of WRAN's operating on different channels identifies and addresses a number of important issues relating to the current CBP mechanism (in D0.3) used for inter-cell discovery and communication. The present invention provides fundamental remedies to respectively resolve these issues. Moreover, an Enhanced Coexistence Beaconing Protocol (CBP) is provided that allows efficient, scalable, and backward-compatible cross-channel inter-cell communications for IEEE 802.22 systems. | 12-04-2008 |
20090147741 | PARALLEL DATA SERVICES AND SPECTRUM SENSING WITH COGNITIVE CHANNEL SWITCHING IN A WIRELESS AREA NETWORK - Data service transmission interruption is minimized by initially setting up a cluster of channels to transmit data services. As the need arises to switch channels due to the detection of an incumbent signal, the data services can be switched with substantially no delay. A group of channels from those available in a wireless network are chosen to form a cluster of channels. Each channel within the cluster is set up to convey data services with channel parameters being stored. A first operating channel is chosen from among the cluster of channels to transmit the data services. While the data services are being transmitted on the first operating channel, out-of-band spectrum sensing occurs on the other channels. Upon predetermined criteria a channel switch occurs. As each channel has already been set up the necessary channel parameters are retrieved from storage and restored without data service interruption. | 06-11-2009 |
20090180492 | ON-DEMAND SPECTRUM CONTENTION FOR INTER-CELL SPECTRUM SHARING IN COGNITIVE RADIO NETWORKS - A protocol for resolving shared spectrum contentions in cognitive radio wireless access networks is presented. Using medium access control level messaging a request for access to a shared spectrum is conveyed to the current occupier of the spectrum. Each request is associated with a unique and random spectrum access priority number. At the end of a request window the priority numbers associated with each request are compared and a winner is declared. The winning cell, informed of its newly gained access to the shared spectrum, sends a reply to the current occupier of the shared spectrum with a proposed time of acquisition/release of the shared spectrum. The proposed time is confirmed and announced, and upon arrival of the designated time the shared spectrum is released by the current occupier of the shared spectrum and acquired by the requesting cell. | 07-16-2009 |
20100142463 | FRAME-BASED ON-DEMAND SPECTRUM CONTENTION PROTOCOL-MESSAGING METHOD - The message flows of a distributed, cooperative, and real-time protocol for frame-based spectrum sharing called Frame-based On-Demand Spectrum Contention (FODSC) employs interactive MAC messaging on an inter-network communication channel to provide efficient, scalable, and fair inter-network spectrum sharing among the coexisting cognitive radio cells. | 06-10-2010 |
20100142559 | SUPER-FRAME STRUCTURE FOR DYNAMIC SPECTRUM SHARING IN WIRELESS NETWORKS - A coexistence communications method for use between wireless networks includes adopting a super-frame structure for use in a wireless network having a plurality of frames, wherein a first frame includes a super-frame preamble, a super-frame control header, a data portion, and a regular self-coexistence window, an intermediate frame includes an OFDM symbol, a data portion, and a regular self-coexistence window, and a last frame includes an OFDM symbol, a data portion, and a joining self-coexistence window, using the self-coexistence windows to exchange inter-wireless network co-existence messages, and using a last reserved self-coexistence window to announce intra-wireless network negotiation decisions. | 06-10-2010 |
20100232310 | FRAME BASED, ON-DEMAND SPECTRUM CONTENTION METHODOLOGY - A frame-based, on-demand spectrum contention protocol provides a fine grain allocation of a shared spectrum resource in a cognitive radio network. Each frame of a plurality of synchronized superframes is allocated independently based on contention criteria. As demands for increased spectrum resources are realized, targeted protocol is followed resulting in targeted requests issued to base stations currently occupying certain data frames. A contention resolution process occurs at the base station currently occupying the targeted spectrum resource in which spectrum contention numbers generated by each base station vying for access to a shared spectrum are compared. The base station winning the contention is announced and after a predetermined period of time, the contention winner occupies the contended spectrum resource. | 09-16-2010 |
20100232358 | FRAME BASED, ON-DEMAND SPECTRUM CONTENTION PROTOCOL VECTOR MESSAGING - A frame-based, on-demand spectrum contention protocol provides a fine grain allocation of a shared spectrum resource in a cognitive radio network. Each frame of a plurality of synchronized superframes is allocated independently based on contention criteria. As demands for increased spectrum resources are realized, targeted requests are issued to base stations currently occupying targeted data frames via vector messages. Such messages, carried by a beacon period within each data frame, identify to the current occupier of a data frame which data frames have been targeted for contention. A contention resolution occurs at the base station currently occupying the targeted spectrum resource and the results of which are communicated via other vector messages. After a predetermined period of time a vector message announces the release of the data allowing the contention winner to occupy the contended spectrum resource. | 09-16-2010 |
20100232359 | FRAME BASED, ON-DEMAND SPECTRUM CONTENTION DATA FRAME ACQUISITION - A frame-based, on-demand spectrum contention protocol provides a fine grain allocation of a shared spectrum resource in a cognitive radio network. Each frame of a plurality of synchronized superframes is allocated independently based on contention criteria. As demands for increased spectrum resources are realized, targeted requests are issued to base stations currently occupying targeted data frames. A contention resolution occurs at the base station currently occupying the targeted spectrum resource. The winner of the base station is announced and after a predetermined period of time, the contention winner occupies the contended spectrum resource. | 09-16-2010 |
20100232360 | FRAME-BASED, ON-DEMAND SPECTRUM CONTENTION SOURCE RESOLUTION - A frame-based, on-demand spectrum contention protocol provides a fine grain allocation of a shared spectrum resource in a cognitive radio network. Each frame of a plurality of synchronized superframes is allocated independently based on contention criteria. As demands for increased spectrum resources are realized targeted requests are issued to base stations currently occupying targeted data frames. A contention resolution occurs at the base station currently occupying the targeted spectrum resource. The winner of the base station is announced and after a predetermined period of time the contention winner occupies the contended spectrum resource. | 09-16-2010 |
20100232361 | FRAME BASED, ON-DEMAND SPECTRUM CONTENTION DESTINATION RESOLUTION - A frame-based, on-demand spectrum contention protocol provides a fine grain allocation of a shared spectrum resource in a cognitive radio network. Each frame of a plurality of synchronized superframes is allocated independently based on contention criteria. As demands for increased spectrum resources are realized targeted requests are issued to base stations currently occupying targeted data frames. A contention resolution occurs at the base station currently occupying the targeted spectrum resource. The winner of the base station is announced and after a predetermined period of time the contention winner occupies the contended spectrum resource. | 09-16-2010 |
20100232381 | FRAME-BASED, ON-DEMAND SPECTRUM CONTENTION PROTOCOL SPECIFICATIONS - A frame-based, on-demand spectrum contention protocol provides a fine grain allocation of a shared spectrum resource in a cognitive radio network. Each frame of a plurality of synchronized superframes is allocated independently based on contention criteria. As demands for increased spectrum resources are realized, targeted requests are issued to base stations currently occupying targeted data frames. A contention resolution occurs at the base station currently occupying the targeted spectrum resource. The winner of the base station is announced and after a predetermined period of time, the contention winner occupies the contended spectrum resource. | 09-16-2010 |
20110075586 | Method of Inter-System Coexistence and Spectrum Sharing for Dynamic Spectrum Access Networks-On-Demand Spectrum Contention - This invention relates to cognitive radio based wireless communications of dynamic spectrum access networks, and more particularly to a method of addressing inter-systems (cells) coexistence and spectrum sharing. The described method of spectrum sharing called On-Demand Spectrum Contention, integrates Dynamic Frequency Selection and Transmission Power Control with iterative on-demand spectrum contentions and provides fairness, adaptability, and efficiency of spectrum access for dynamic spectrum access systems using active inter-system coordination. | 03-31-2011 |
20110090847 | ENABLING INTEROPERABILITY OF DUAL-RADIO AND SINGLE-RADIO DEVICES FOR VEHICULAR MULTI-CHANNEL OPERATIONS - A method for interoperations between single-radio (channel switching) devices and single-radio (always-on) devices includes single-radio (always-on) devices keep announcing safety messages on the safety channel at any time and keep monitoring packet transmissions on the safety channel at all times when it not transmitting in a normal mode; single-radio (channel switching) devices announce safety messages on the safety channel and keep monitoring packet transmissions on the safety channel during a safety channel interval; and once a single-radio (always-on) device detects the existence of a single-radio (channel-switching) device after successfully receiving at least one safety message transmitted by the single-radio (channel-switching) device during the safety channel interval, it enters to an interoperation mode, in which the single-radio (always-on) device shall transmit safety messages at least during the safety channel interval of the single-radio (channel-switching) device. Methods for interoperations between single-radio devices and dual-radio devices, with and without a safety channel are also disclosed. | 04-21-2011 |
20110255520 | COMMUNICATION BETWEEN OVERLAPPING WRAN CELLS WORKING IN DIFFERENT CHANNELS - A common control channel for base station (“BS”)/consumer premise equipment (“CPE”) communication in areas of overlapping coverage by wireless regional area network (“WRAN”) cells operating on different working channels is disclosed. A common control channel is selected from among the various working channels sensed in each of a plurality of overlapping WRAN cells so as to enable BS/CPE and BS/BS communication. Once chosen, each CPE within the overlapping area communicates with the controlling BS via an enhanced coexistence beacon protocol messages. These messages include timing and other synchronization information. | 10-20-2011 |
20110286421 | SCHEDULING METHODS FOR CONNECTION-BASED, OVER-THE-AIR, INTER-SYSTEM COMMUNICATIONS FOR WIRELESS NETWORKS - A method for communications between neighboring wireless cells such as wireless regional area networks operating according to IEEE 802.22 specifications. The method involves scheduling inter-base station communications for over-the-air connections to allow neighboring base stations to communicate in environments where a single available channel is shared between the neighboring cells or where two or more channels used by two or more neighboring cells. In some embodiments, a bridge system, such as a bridge consumer premise equipment (CPE), positioned in an area of coverage overlap between two cells is used for inter-base station communications, and allocation and scheduling of bandwidth on the utilized channels is performed to provide interference free communications between the base stations. Existence announcements are provided in coexistence time slots and requests for bandwidth such as reserved and additional time slots are transmitted between the base stations using the coexistence time slots. | 11-24-2011 |
20110294424 | OPERATION PROCEDURES FOR INTEROPERABLE SAFETY AND NON-SAFETY COMMUNICATIONS IN WIRELESS ENVIRONMENTS - For enhanced interoperability of safety and non-safety communications, a dual-radio type T RSU for improving services includes a first radio dedicated to the control channel and a second radio dedicated to the safety channel. The control channel is divided into a number of synchronous intervals, each about 100 milliseconds in duration. The safety channel is also divided into a number of synchronous intervals, each about 100 milliseconds in duration. | 12-01-2011 |
20110294434 | CHANNEL SWITCHING FOR INTEROPERABLE SAFETY AND NON-SAFETY COMMUNICATIONS IN WIRELESS ENVIRONMENTS - For enhanced interoperability of safety and non-safety communications, a synchronous interval is divided into a safety channel interval and an open interval instead of a CCH (control channel) interval and SCH (service channel) interval. For a single-radio device, a control interval, in place of an open interval should be scheduled at least once every maximum service scheduling period. Such a control interval is dedicated for CCH (and SCH) operation. For a multi-radio device, a control interval is scheduled at least once every maximum control interval on one of the radios support non-safety services (e.g. tolling). | 12-01-2011 |
20110294447 | DISCOVERY OF SAFETY AND NON-SAFETY CAPABLE SINGLE-RADIO DEVICES IN WIRELESS ENVIRONMENTS - Discovery of safety and non-safety capable single-radio devices in vehicular wireless environments is made possible through the use a two-bit indicator. A first indicator is associated with a type C device. A second indicator is associated with a non-type C device within one hop of a type C device. A third indicator is associated with a non-type C device within two hops of a type C device. A fourth indicator is associated with a non-type C device within three hops or more (out of range) of a type C device. Discovery of safety and non-safety capable single-radio vehicular devices within a protection range in multiple-channel based wireless vehicular environments is thus made possible. | 12-01-2011 |
20110310767 | METHODS OF RF SENSING CONTROL AND DYNAMIC FREQUENCY SELECTION CONTROL FOR COGNITIVE RADIO BASED DYNAMIC SPECTRUM ACCESS NETWORK SYSTEMS-COGNITIVE DYNAMIC FREQUENCY HOPPING - This invention relates to cognitive radio based wireless communications of dynamic spectrum access networks, and more particularly to a method of addressing radio frequency sensing control and dynamic frequency selection control. A method called Cognitive Dynamic Frequency Hopping that is based on the selective Simultaneous Sensing and Data Transmissions is described. The Cognitive Dynamic Frequency Hopping method is further facilitated by a collision avoidance technique. The described method satisfies both reliable and timely RF sensing for guaranteeing licensed user protection, and QoS satisfaction for services of the dynamic spectrum access systems. | 12-22-2011 |
20120230283 | INTER-CELL DISCOVERY AND COMMUNICATION USING TIME DIVISION MULTIPLE ACCESS COEXISTENCE BEACONING PROTOCOL - A self-coexistence window reservation protocol for a plurality of Wireless Regional Area Network (WRAN) cells operating in a WRAN over a plurality of channels includes a sequence of self-coexistence windows that uniquely identifies a transmission period for each WRAN cell. A self-coexistence window reservation protocol is included within the first packet of a Coexistence Beaconing Protocol period identifying when each WRAN cell associated with a particular channel will transmit. When not actively transmitting, a WRAN cells remains in a passive, receiving mode to accept data. As the transmissions of each WRAN cell operating on a particular channel are scheduled, contention for a transmission period is eliminated. | 09-13-2012 |
20120300811 | ZERO DELAY FREQUENCY SWITCHING WITH DYNAMIC FREQUENCY HOPPING FOR COGNITIVE RADIO BASED DYNAMIC SPECTRUM ACCESS NETWORK SYSTEMS - This invention relates to cognitive radio based wireless communications of dynamic spectrum access networks, and in particular to a method of addressing zero-delay frequency switching for cognitive dynamic frequency hopping. The method combines regular (periodic) channel maintenance with dynamic frequency hopping over a cluster of vacated channels that are initially setup such that the switching delays for channel setup and channel availability check are eliminated. | 11-29-2012 |
20130215873 | MULTI-CHANNEL INTER BASE-STATION COMMUNICATION - The invention relates to systems and methods for spectrum sharing and communication among several wireless communication networks with overlapping service areas (or cells), especially to Wireless Regional Area Networks (WRANs). Particular embodiments of the invention disclose using a conference channel to communicate between base stations. Other embodiments use slotted coexistence windows within frames to transmit and receive information, including for reserving transmission times within subsequent frames. | 08-22-2013 |
20130244592 | RADIO FREQUENCY ARCHITECTURE FOR SPECTRUM ACCESS NETWORKS - Radio frequency (RF) architectures for spectrum access networks are provided. Embodiments of the invention generally provide a radio frequency (RF) architecture for customer premise equipment (CPE) for use in, for example, IEEE 802.22 wireless regional area networks (WRANs). In some embodiments, the CPE RF architecture includes two receive chains with a directional antenna and an omni-directional antenna, respectively. The CPE RF architecture facilitates opportunistic out-of-band spectrum sensing and WRAN signal receiving that are performed in parallel with data transmission. | 09-19-2013 |
20140023034 | Frame Based, On-Demand Spectrum Contention Protocol Vector Messaging - Systems and methods are disclosed by which base stations with overlapping service areas allocate frames within superframes of a channel in a cognitive radio communication network. The frames are assigned for sole use by a base station on a frame-by-frame basis using a Frame-Based, On-Demand Spectrum Contention process. The process resolves contentions for use of frames using equally probable random numbers. The results of the process are transmitted and received between base stations using vector messages. Applications of the methods and systems include Wireless Regional Area Networks (WRANs), including those using the standards of IEEE 802.22. | 01-23-2014 |