摘要:
A dynamic carrier selection method and system permit units operating on a first carrier to change to a second carrier when performance of the first carrier becomes unacceptable. Carrier quality measurements are taken in which carrier quality is a function of interference and multi-path fading and carrier-signal strength. The carriers are ranked according to measured quality in a carrier candidate list. The carrier candidate list is used to permit units to determine which carrier they should switch to when the carrier there currently operating on is determined to have unacceptable performance. Carrier measurements are retaken in response to a carrier change by unit or a predetermined time period having elapsed.
摘要:
A dynamic carrier selection method and system permit units operating on a first carrier to change to a second carrier when performance of the first carrier becomes unacceptable. Carrier quality measurements are taken in which carrier quality is a function of interference and multi-path fading and carrier-signal strength. The carriers are ranked according to measured quality in a carrier candidate list. The carrier candidate list is used to permit units to determine which carrier they should switch to when the carrier there currently operating on is determined to have unacceptable performance. Carrier measurements are retaken in response to a carrier change by unit or a predetermined time period having elapsed.
摘要:
Method and apparatus for dynamically selecting a packet type based on the quality estimates of the channel are disclosed. From these channel quality estimates, specific properties of the packet may be selected including whether a coding scheme should be used, the packet length, and the modulation used. The packet type selection is then performed in a dynamic fashion based on updates or changes to the channel conditions.
摘要:
A method for public key certification in a local network environment, wherein a personal certification authority associated with the local network environment is connected with a first device needing to be certified. Responsive to the connection, a certificate is provided to the device to be certified from the personal certification authority. The devices receiving a certificate may then use the certificate to carry out secure information exchange within the local network environment with other devices having a similar certificate.
摘要:
An apparatus and method for transmitting packets having quality of service requirement wherein the quality of service requirements associated with the packets are received at an input, said quality of service parameters include at least one of delay, bandwidth, peak bandwidth and retransmission bandwidth. The received quality of service parameters are mapped to radio protocol parameters including at least one of a priority slot interval, a priority slot phase, a packet duration and modulation format for the radio channel. The packets are transmitted on a radio channel according to the mapped radio protocol parameters.
摘要:
To enhance in-building location determination of an electronic device, described is a system and a method that uses a blip access point to transfer location assistance information to the electronic device. The location assistance information may contain a map of dummy beacons that serve as reference points (e.g., landmarks) from which the electronic device may determine its location relative to the map information.
摘要:
Wireless communication terminals and methods are disclosed that determine acoustic ranging synchronized to RF communication signals. A communication terminal can include a RF transceiver, a microphone, and a controller. The controller synchronizes a clock in response to known timing characteristics of received RF communication signals. The controller determines an acoustic signal generation time relative to the RF communication signal synchronized clock at which the other communication terminal will generate an acoustic signal. The controller determines an acoustic signal receipt time relative to the RF signal synchronized clock when the acoustic signal from the other communication terminal is detected in the microphone signal. The controller further determines a propagation time of the acoustic signal from the other communication terminal to the microphone based on a difference between the acoustic signal generation time and the acoustic signal receipt time, and determines a range to the other communication terminal in response to the propagation time of the acoustic signal.
摘要:
Packet transmissions between a base station and terminals are performed using half-duplex uplink and downlink transmission intervals with adaptive intra-interval packet retransmission and packet expansion. The uplink and downlink transmission intervals used for communication with a terminal may be offset commensurate with a degree of symmetry of information flow between the terminal and the base station. The offset between the uplink and downlink transmission intervals may be adaptively adjusted based on a type of information being communicated between terminals and the base station. For example, different offsets may be used for voice and data communications. In some embodiments of the present invention, uplink and downlink transmission intervals for communications with a terminal have substantially equal durations. For example, voice packet transmissions between the base station and the terminal may use uplink and downlink transmission intervals having substantially equal durations.
摘要:
A method and control device for generating a transmit power level for a communication apparatus for operation in a wireless communication network having a network node. The control device comprises a controller adapted to generate a request message for requesting access to a communication channel, to be transmitted to the network node. The control device is also adapted to determine whether access to the communication channel has been granted in response to the request message. A transmit power control unit is adapted to generate a transmit power level for the communication apparatus in dependence of whether access to the communication channel has been granted.
摘要:
Transmitter and receiver functionality are separated in dual-mode radio transceivers to support high-rate services. Transceivers with highly asymmetric requirements that need only a high-rate transmission or only high-rate reception functionality are supported by including a high-rate transmitter to support pushing data out or a high-rate receiver to support pulling data into the transceiver at high data rates.