摘要:
An adaptive file delivery system and method transmits a data file, such as an audio-video file, over a network or collection of networks in segments, each segment transmitted during a different time period. Each time period has a transmission portion to transmit its associated file segment and a wait portion in which no further interaction with the network occurs regarding the transmitted segment. In some implementations, the duration of the transmission portion of each time period is sufficient to reach a steady-state throughput condition, which allows the traffic load status of the network or networks to be determined from rate measurements of file segment transmissions. The duration of the wait portion of each time period is at least long enough to limit the average rate of file segment transmission to adapt to network traffic load variations while causing the entire file to be delivered in a predetermined delivery deadline.
摘要:
Polling methods for use in a communication system, such as a fixed wireless communication system, are described. The fixed wireless communication system includes at least one wireless base unit and a plurality of fixed-location wireless transceiver units, where each transceiver unit is, for example, located at a home residence and coupled to a personal computer (PC). In one particular polling method, a wireless transceiver unit detects a failure of a primary energy source, switches to a battery backup for power, and sends a message to the wireless base unit indicating such failure. The message initiates the wireless base unit to poll the wireless transceiver unit on a periodic basis for status information. During the failure, a data traffic channel established between the units is torn down to conserve power at the wireless transceiver unit. Once the primary energy source is restored, the data traffic channel is brought back up and the periodic polling is terminated. Similar methods are applied in connection with the detection of a communication failure over the data traffic channel.
摘要:
A data link layer tunneling technique improves the throughput of high speed data in noisy wireless environments. Recovering lost frames transmitted between a packet sending unit and a packet receiving unit in a data communications system generally comprises (a) identifying a failure to successfully receive a missed frame at the packet receiving unit; (b) establishing a logical tunnel channel at the packet receiving unit to acknowledge the next successfully received frame; (c) starting a first timer at the packet receiving unit; (c) upon receiving a tunnel establishment request from the packet receiving unit, the packet sending unit resending the missed frame on the logical tunnel channel and starting a second timer; and (d) the packet sending unit resending the missed frame a specified number of times until receiving an acknowledgement from the packet receiving unit.
摘要:
In one example, a network device stores a mapping of application operation modes to vehicle conditions such as a first condition of the vehicle powered but not moving and a second condition of the vehicle moving. The network device receives a wirelessly transmitted request for a particular application to utilize an interface powered by the vehicle. The network device compares an application identifier specified by the received request to the mapping. The network device then identifies a portion of the vehicle interface according to the comparison and signals control software on the vehicle to grant the particular application access to only the identified portion of the vehicle interface itself. The application can reside on the mobile device and utilize the vehicle interface as an extended interface, or the application can reside on the vehicle.
摘要:
In one example, a network device stores a mapping of application operation modes to vehicle conditions such as a first condition of the vehicle powered but not moving and a second condition of the vehicle moving. The network device receives a wirelessly transmitted request for a particular application to utilize an interface powered by the vehicle. The network device compares an application identifier specified by the received request to the mapping. The network device then identifies a portion of the vehicle interface according to the comparison and signals control software on the vehicle to grant the particular application access to only the identified portion of the vehicle interface itself. The application can reside on the mobile device and utilize the vehicle interface as an extended interface, or the application can reside on the vehicle.
摘要:
Polling methods for use in a communication system, such as a fixed wireless communication system, are described. The fixed wireless communication system includes at least one wireless base unit and a plurality of fixed-location wireless transceiver units, where each transceiver unit is, for example, located at a home residence and coupled to a personal computer (PC). In one particular polling method, a wireless transceiver unit detects a failure of a primary energy source, switches to a battery backup for power, and sends a message to the wireless base unit indicating such failure. The message initiates the wireless base unit to poll the wireless transceiver unit on a periodic basis for status information. During the failure, a data traffic channel established between the units is torn down to conserve power at the wireless transceiver unit. Once the primary energy source is restored, the data traffic channel is brought back up and the periodic polling is terminated. Similar methods are applied in connection with the detection of a communication failure over the data traffic channel.
摘要:
A method of operating a communication system is disclosed. The method includes transmitting from a remote unit to a base station remote unit channel data. The remote unit channel is generated at the remote unit and includes data about a first portion of communication channels on which the call can be executed. The method also includes applying a channel selection method to the remote unit channel data and to base station channel data so as to select a communication channel from among the first portion of communication channels. The base station channel data is generated at the base station and includes data about a second portion of the communication channels. The method further includes executing a call on the selected communication channel.
摘要:
An adaptive file delivery system and method transmits a data file, such as an audio-video file, over a network or collection of networks in segments, each segment transmitted during a different time period. Each time period has a transmission portion to transmit its associated file segment and a wait portion in which no further interaction with the network occurs regarding the transmitted segment. In some implementations, the duration of the transmission portion of each time period is sufficient to reach a steady-state throughput condition, which allows the traffic load status of the network or networks to be determined from rate measurements of file segment transmissions. The duration of the wait portion of each time period is at least long enough to limit the average rate of file segment transmission to adapt to network traffic load variations while causing the entire file to be delivered in a predetermined delivery deadline.
摘要:
Methods and apparatus are disclosed for implementing a mobile digital radio playlist system. The playlist need not be maintained in a vehicle; preferably it is maintained on a user's equipment such as a computer, PDA, MP3 player or the like. The system enables a method of updating such a playlist conveniently, for example while traveling in a vehicle, by capturing indicia of a current song in a mobile digital radio receiver in response to a user capture input; transmitting the captured indicia from the digital radio receiver to a wireless telecommunication device; in the wireless telecommunication device, forwarding the captured indicia to a playlist server; and in the playlist server, forwarding the received indicia to the user's equipment to update the playlist.
摘要:
In one example, a network device stores a mapping of application operation modes to vehicle conditions such as a first condition of the vehicle powered but not moving and a second condition of the vehicle moving. The network device receives a wirelessly transmitted request for a particular application to utilize an interface powered by the vehicle. The network device compares an application identifier specified by the received request to the mapping. The network device then identifies a portion of the vehicle interface according to the comparison and signals control software on the vehicle to grant the particular application access to only the identified portion of the vehicle interface itself. The application can reside on the mobile device and utilize the vehicle interface as an extended interface, or the application can reside on the vehicle.