IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0294128
(2007-03-30)
|
등록번호 |
US-8155052
(2012-04-10)
|
우선권정보 |
EP-06251889 (2006-04-03) |
국제출원번호 |
PCT/GB2007/001184
(2007-03-30)
|
§371/§102 date |
20080923
(20080923)
|
국제공개번호 |
WO2007/113523
(2007-10-11)
|
발명자
/ 주소 |
- Gonzalez-Velazquez, Antonio E
|
출원인 / 주소 |
- British Telecommunications public limited company
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
1 |
초록
▼
A wireless device is operable to use received signals to divide time into a succession of frames, each frame having plural consecutive timeslots, and into a succession of four or more superframes. A transmitter is operated only in a single timeslot in one frame. A receiver is operated in the other t
A wireless device is operable to use received signals to divide time into a succession of frames, each frame having plural consecutive timeslots, and into a succession of four or more superframes. A transmitter is operated only in a single timeslot in one frame. A receiver is operated in the other timeslots in the frame and for all timeslots of immediately preceding and following frames, and in no other frames. This allows devices to predict periods in which to hibernate or carry out intensive tasks. The device determines which timeslots of the first frame are occupied to provide local awareness information, and transmits it as a code on its transmit timeslot along with payload data. This allows other devices in a network to obtain information about their local environment and about the environment of their neighbors. Routing decisions are made on this basis.
대표청구항
▼
1. A method of operating a plurality of wireless devices each including a receiver and a transmitter, the method comprising: controlling each device to divide time into a succession of frames, each frame having plural consecutive timeslots, and into a succession of superframes, each superframe compr
1. A method of operating a plurality of wireless devices each including a receiver and a transmitter, the method comprising: controlling each device to divide time into a succession of frames, each frame having plural consecutive timeslots, and into a succession of superframes, each superframe comprising at least four frames, wherein, within any superframe, each frame represents a respective hop distance from a base station;wherein one or more of the devices operates as the base station and selects a predetermined frame or frames as its transmission frame;for each device other than the base station, operating its receiver to detect transmissions from other devices and determine the frames on which they are transmitting;for each device other than the base station, operating its transmitter in one or more timeslots of a transmission frame within each superframe, selected according to the signals received from the other devices, and refraining from operating the transmitter in the other frames of the superframe;operating the receiver of each device in at least some of the timeslots of at least the two frames in each superframe that represent hop distances respectively one hop greater and one hop fewer than the hop distance represented by the transmission frame; andrefraining from operating the transmitter and the receiver in at least one further frame in each superframe. 2. A method as claimed in claim 1, wherein the receiver of each device is also operated in at least some of the timeslots of the first frame in which the transmitter is not operated. 3. A method as claimed in claim 1, wherein all the devices operate at the same frequency. 4. A method as claimed in claim 1, wherein, on correctly receiving a packet in a timeslot, a code of the received packet is separated from payload data to provide a received code and storing the received code according to the timeslot in which it was received. 5. A method as claimed in claim 4, comprising comparing the bits of the received code that relate to the timeslot in which it was received to corresponding bits of a code generated by the device relating to the same timeslot. 6. A method as claimed in claim 1, wherein at least one of the devices includes a scheduling function operable to control the device to perform calculations and other functions at times other than times when the transmitter and the receiver are in use. 7. A method as claimed in claim 1, wherein at least one of the devices includes a scheduling function operable to control the device to operate a sensor to perform a sensing operation at times other than times when the transmitter and the receiver are in use. 8. A method as claimed in claim 1, wherein at least one of the devices includes a scheduling function operable to control the device to hibernate between the frames in which the transmitter and the receiver are in use in two successive superframes. 9. A method as claimed in claim 1, wherein the number of frames in a superframe is between 10 and 50. 10. A non-transitory computer readable medium carrying a computer program which, when executed by a data processing apparatus, causes the apparatus to perform the method according to claim 1. 11. A wireless communications device comprising a receiver and a transmitter,a timer to divide time into a succession of frames in accordance with signals received by the receiver, each frame having plural consecutive timeslots, and into a succession of superframes, each superframe comprising at least four frames, wherein within any superframe, each frame represents a respective hop distance from a predetermined base station;a controller to operate the receiver to detect transmissions from other devices and determine the frames on which they are transmitting, and to control the transmitter to operate in one or more timeslots of a transmission frame within each superframe selected according to the transmissions so detected, whilst refraining from operating the transmitter in the other frames of the superframe, and to control the receiver in at least some of the timeslots of at least the two frames in each superframe that represent hop distances respectively one hop greater and one hop fewer than the hop distance represented by the transmission frame; and to refrain from operating the transmitter and the receiver in at least one further frame in each superframe.
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