Abstract:
PROBLEM TO BE SOLVED: To provide an improved beacon signaling method for facilitating accurate energy detection and timing synchronization with a transmitter. SOLUTION: Beacon signals of a narrow band are transmitted on the same tone in at least two consecutive symbol periods with at least 60% power against a transmitter power during the relevant periods. Further, a wideband signal is transmitted during at least one of at least two consecutive symbol periods with 40% or less power of the transmitter power during the relevant period. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To allow a wireless terminal's receiver to remain on its current operating frequency band, and still identify the carrier frequency used by the neighboring sector or cell. SOLUTION: A base station sector transmitter in a multi-carrier wireless communication system transmits ordinary signaling, such as user data, in its own assigned band. In addition, the sector base station sector transmitter periodically transmits beacon signals into the frequency band used by adjacent sector transmitters for their ordinary signaling. Each beacon signal, being a short duration high power signal having the sector's transmission power and concentrated on one or a few tones, is easily detectable, and may be identified as to the source base station sector transmitter based on the tone. A mobile node, tuned to a single carrier band, receives a plurality of beacon signals, identifies the sources of the received beacons, compares the received intensity of the beacons, and makes handoff decisions, without having to switch carrier band. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide methods and apparatus related to peer to peer communications.SOLUTION: A first peer to peer wireless device, having transmitted a request to a second peer to peer device to transmit traffic data using a corresponding air link resource, monitors a response from the second device and responses from other devices during a monitoring period. The first device makes a decision whether or not to transmit as a function of the received power of the received response signals. The first device, although authorized to transmit by the second device, may decide not to transmit and yield the traffic air link resource. The second device monitors reception of transmission requests, determines a power level of a request from the first device to transmit to the second device and a request to transmit to a third device, and determines whether or not to authorize the first device to transmit.
Abstract:
PROBLEM TO BE SOLVED: To provide efficient management of air link resources and interference control in peer to peer communication networks.SOLUTION: A first peer to peer wireless communications device, having determined to transmit traffic data signals to a second peer to peer wireless communications device, (i) transmits a pilot signal to the second device, (ii) receives a corresponding rate information signal from the second device, and (iii) transmits traffic data to the second device at a rate and/or power level determined on the basis of the received signal. The second device, subsequently having received traffic signals from the first device, (i) receives a peer to peer pilot signal, performs a rate determination as a function of the received signal, (iii) generates a rate information signal providing information to be used by the first device in determining a maximum permitted data traffic transmission rate, and (iv) transmits the generated signal to the first device.
Abstract:
PROBLEM TO BE SOLVED: To provide a new improved method allowing wireless devices in a cognitive radio network to detect availability of a locally usable spectrum for communication.SOLUTION: A wireless terminal, which may have entered a new area and been powered up, monitors to detect for the presence of beacon signals in a communications band. When the wireless terminal fails to detect a beacon, the wireless terminal assumes that the spectrum is available and transmits its user beacon signal into the area thereby providing notification of its presence to other wireless terminals. The wireless terminal maintains a coordinated timing relationship between its beacon transmit interval and beacon detect interval, which are performed on an ongoing basis. Its beacon TX interval and beacon monitoring interval represent a small fraction of total time, allowing for power conservation. The coordinated timing relationship, known to peers, facilitates efficient peer-to-peer communications session establishment.
Abstract:
PROBLEM TO BE SOLVED: To provide a system and method that facilitate handing off from a first sector to a second sector.SOLUTION: An established link to the first sector is employed to communicate with the second sector. A handoff request from a wireless terminal to the second sector and an associated handoff response from the second sector to the wireless terminal both traverse the first sector.
Abstract:
PROBLEM TO BE SOLVED: To provide techniques to transmit data in a manner to improve throughput and reduce interference.SOLUTION: In transmission techniques using configurable channels for downlink and/or uplink, the downlink channel and/or uplink channel may be independently selected for a terminal. The terminal may establish a connection with a base station on default downlink and uplink channels. Another downlink channel and/or another uplink channel may be selected based on various factors such as channel quality, loading, and interference. The terminal would then switch to the new downlink and/or uplink channel for communication.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and an apparatus for sharing of wide area network (WAN) uplink bandwidth with peer to peer communication signaling usage.SOLUTION: A base station regulates the level of interference from a peer to peer signaling by generating and transmitting peer to peer transmission power control signals intended for peer to peer wireless terminals in the local vicinity. A base station transmits, into a downlink frequency band, a signal, e.g., a beacon or broadcast channel signal, to be used by a peer to peer wireless terminal in controlling its peer to peer transmit power level into the corresponding uplink frequency band. The peer to peer wireless terminal receives and evaluates the base station signal. The determined information from the evaluation is used in determining whether or not peer to peer signal transmission is permitted and/or in determining a peer to peer transmission power level.
Abstract:
PROBLEM TO BE SOLVED: To provide a multi-mode base station having a transmission standby mode that is a low power/low interference level of operation.SOLUTION: A multi-mode base station includes a transmission standby mode and an active mode. Transmission standby mode (1322) of base station operation is a low power/low interference level of operation as compared to active mode. In transmission standby mode at least some of the synchronization signaling such as pilot tone signaling is reduced in power level and/or rate with respect to the active mode. In the transmission standby mode, the base station may have some sleep state registered wireless terminals being serviced. Mode transitions (1320) from active to transmission standby may be in response to: a detected period of inactivity, scheduling information, base station mode change signals, and/or detected wireless terminal state transition. Mode transitions from transmission standby to active may be in response to: scheduling information, access signals, wake-up signals, hand-off signals, wireless terminal state change signals, and/or base station mode change signals.
Abstract:
PROBLEM TO BE SOLVED: To provide methodologies that facilitate transmitting beacon symbols of a beacon message such that a sequence of symbols can satisfy a linear constraint over a field where the field elements can be identified with carriers.SOLUTION: A coding scheme can be applied to a beacon message; the coding scheme can produce a plurality of beacon symbols to transmit on given subcarriers. A receiving device of the beacon symbols decodes a beacon message by receiving less than the total number of symbols in a beacon message and determining the remaining symbol subcarriers based on the linear constraint. Thus, more efficient decoding of beacons is facilitated as well as resolving beacon ambiguity by figuring out which symbols satisfy linear constraints for the symbols, and resolving time and frequency shift by detecting an offset that would result in satisfaction of the linear constraint.