Abstract:
Certain aspects of the present disclosure provide methods and apparatus that may determine operation for speed frame exchange. According to certain aspects, a method for wireless communications by an apparatus is provided. The operations may be performed by a station, for example, by an access point initiating a speed frame exchange. The method generally includes indicating, via a value of at least one bit of a field of a frame of a sequence of frames being exchanged between the apparatus and a device, whether the apparatus is initiating a subsequent exchange of a sequence of frames, and transmitting the frame to the device.
Abstract:
Systems, methods, and devices for high-efficiency wireless frequency division multiplexing are provided. A method includes determining, at an access point, a performance characteristic for each wireless device in a set of wireless devices associated with the access point. The method further includes categorizing each wireless device in the set into at least a first and second subset of wireless devices based on the performance characteristic. The method further includes receiving communications from the first subset of wireless devices on a first set of wireless frequencies. The method further includes receiving communications from the second subset of wireless devices on a second set of wireless frequencies, the second set of wireless frequencies being a subset of the first. The first set of wireless devices have a higher performance characteristic than the second set of wireless devices.
Abstract:
Systems, methods, and devices for high-efficiency wireless frequency division multiplexing are provided. A method includes exchanging, at an access point, at least one frame reserving a wireless medium with at least one of a first and second wireless device. The method further includes receiving a first communication on a first set of wireless frequencies from the first wireless device. The method further includes receiving a second communication, at least partially concurrent with the first communication, on a second set of wireless frequencies from the second wireless device. The method further includes transmitting at least one acknowledgment of the first and second communication. The first set and the second set are mutually exclusive subsets of a set of wireless frequencies available for use by both the first and second wireless device.
Abstract:
Systems, methods, and devices for high-efficiency wireless frequency division multiplexing are provided. A method includes receiving, at a first wireless device, a reference signal from an associated access point, the reference signal indicative of a time of joint transmission with at least a second wireless device. The method further includes transmitting a first communication to the access point based on the reference signal, the communication utilizing a first subset of wireless frequencies available for use. The first communication is concurrent with a second communication, from the second wireless device, utilizing a second subset of wireless frequencies, the second subset excluding the first subset.
Abstract:
본 발명은 무선 통신에 관한 것으로 더욱 상세하게는 무선통신 시스템에서 동기 채널 전송,셀 탐색 신호 전송 방법에 관한 것이다. 이를 위해 본 발명은, 다중 캐리어를 지원하는 다계층 셀에서 단말이 효과적으로 서로 다른 주파수에서의 셀을 탐색하고, 이를 구분하기 위한 동기 채널 및 셀 탐색 신호를 제안한다. 단말의 전력 소모를 최적화 하기 위해, 단말이 접속하고 있는 주파수를 통해 다른 주파수의 기지국이 정보를 전송함으로써, 단말이 주변 셀의 존재를 쉽게 파악하고, 추가적인 셀 탐색과정 수행 여부를 판단하도록 새로운 셀 탐색 신호 전송 방법을 제안한다. 또한, 다계층 셀에서 주파수간 측정 정보를 포함하여 셀간의 identification을 명확히 구분하기 위해서 매크로-스몰셀 간의 셀 ID pair를 제안하여, 셀간의 구분 및 스몰셀의 효율을 증대시킬 수 있다. 나아가, TDD를 기반으로 다계층 셀 지원을 위한 상향링크 집중 전송 프레임을 제안하고, 해당 프레임 내에서 동기신호 구성 방식을 제안하고 있다.
Abstract:
A system and method are provided for determining a communications schedule for routing data between a plurality of relay nodes forming a wireless relay network. The communications schedule interconnects the plurality of relay nodes by an ordered sequence of communications links, with the communications links being established over a wireless resource comprising a plurality of resource blocks. The method comprises generating a plurality of candidate connectivity patterns for the ordered sequence of communications links and, for each candidate connectivity pattern, generating a plurality of candidate resource allocations for providing the ordered sequence of communications links in accordance with that candidate connectivity pattern. For each candidate connectivity pattern, a level of a performance characteristic is then calculated for a selected combination of the candidate resource allocations associated with that candidate connectivity pattern. Based on a desired level of the performance characteristic, one of the candidate connectivity patterns and its associated selected combination of candidate resource allocations whose calculated level of the performance characteristic meets the desired level is then selected as the communications schedule to be used. In response to a trigger condition, the performance level evaluation process and the selection process are repeated in order to re- select one of the candidate connectivity patterns and its associated selected combination of candidate resource allocations to be used as the communications schedule. Such an approach provides a particularly flexible and adaptive mechanism for seeking to optimise the performance of a wireless relay network.
Abstract:
The present description relates to a method and apparatus for limiting a downlink subframe in a time division duplex (TDD) mode. The method for limiting a downlink subframe in a TDD mode according to one embodiment of the present description enables a base station, which controls a cell operating in a TDD scheme, to: transmit cell-specific TDD uplink-downlink configuration information and terminal-specific TDD uplink-downlink configuration information of the cell to a user terminal having low power consumption; and transmit uplink allocation information or response control information to the data previously received from the user terminal in a first downlink subframe according to the cell-specific TDD configuration information and terminal-specific TDD configuration information provided to the user terminal. The terminal-specific TDD configuration information indicates one or more candidate subframes which are portions of downlink subframes in the cell.
Abstract:
본 명세서는 TDD 모드에서 다운링크 서브프레임을 한정하는 방법 및 장치에 관한 것이다. 본 명세서의 일 실시예에 따른 TDD 모드에서 다운링크 서브프레임을 한정하는 방법은 TDD(Time Division Duplex) 방식으로 동작하는 셀을 제어하는 기지국에 있어서, 저전력 소비 사용자 단말에게 상기 셀의 셀특이적 TDD 설정 정보(Cell Specific TDD Uplink-Downlink configuration) 및 단말 특이적 TDD 설정 정보를 상기 사용자 단말에게 송신하는 단계; 및 상기 사용자 단말에게 제공된 상기 셀특이적 TDD 설정 정보 및 단말 특이적 TDD 설정 정보에 따른 제 1 다운링크 서브프레임에서 상기 사용자 단말에게 업링크 할당 정보 또는 이전에 상기 사용자 단말로부터 수신한 데이터에 대한 응답 제어 정보를 송신하는 단계를 포함하며, 상기 단말 특이적 TDD 설정 정보는 상기 셀에서의 다운링크 서브프레임 중 일부에 해당하는 다운링크 서브프레임인 후보 서브프레임 중 어느 하나 이상을 지시하는 것을 특징으로 한다.
Abstract:
An endpoint device may be operable to transmit and receive data wirelessly via a medium to which access is time-division multiplexed into a plurality of repeating windows. A first window of the plurality of repeating windows may be time-division multiplexed into a plurality of timeslots utilized for transmitting beacon signals. A second window of the plurality of repeating windows may be time-division multiplexed into a plurality of timeslots utilized for transmitting alarm signals. The endpoint may be assigned one of the first timeslots and, when an alarm condition is present, select one of the second timeslots for transmitting an alarm signal based on the assigned first timeslot, and based on a hash function. The endpoint may then transmit an alarm signal during the second timeslot. The endpoint may be operable to synchronize its local clock by listening to beacons transmitted by other endpoints.
Abstract:
Die Erfindung betrifft ein Verfahren zur Zuordnung von Zeitschlitzen (S0, S1,..., S16) zu Links (L1, L2, L16) zwischen Netzknoten (1, 2,..., 10) eines drahtlos vermaschten Netzes, wobei die Daten in dem Netz zeitschlitz-basiert mittels dieser Zuordnung über Hops bzw. entsprechende Hopebenen (h-2, h-1,..., h+2) von einem Quellknoten zu einem Zielknoten zu übertragen sind. In dem erfindungsgemäßen Verfahren wird zur Datenübertragung ein Hauptpfad (MP) mit jeweils einem Netzknoten (1, 2, 3, 4) pro Hopebene (h-2, h-1,..., h+2) und den entsprechenden Links (L1, L2, L3, L4) zwischen den Netzknoten (1, 2, 3, 4, 5) benachbarter Hopebenen (h-2, h-1,..., h+2) von dem Quellknoten zu dem Zielknoten festgelegt. Ferner werden alternative Netzknoten (6, 7, 8, 9, 10) mit entsprechenden alternativen Links (L5, L6,..., L14) festgelegt, welche anstatt des Hauptpfads (MP) zur Datenübertragung genutzt werden können. Über eine geeignete Zuweisung von Zeitschlitzen zu Links des Hauptpfads sowie alternativen Links wird eine energieeffiziente zeitschlitz-basierte Datenübertragung ermöglicht. Das Verfahren kann beispielsweise in Sensornetzen eingesetzt werden, welche in der Regel Sensoren mit autarker Energieversorgung umfassen. Darüber hinaus kann das erfindungsgemäße Verfahren im Rahmen einer Datenübertragung basierend auf dem an sich bekannten Standard WirelessHART verwendet werden.