摘要:
A wait-time acquisition unit measures a wait time before transmission of data in an exposed terminal, and an interference-amount inferring unit infers the amount of interference in the exposed terminal based on the wait-time information. A channel-utilization calculation unit calculates an amount of channel utilization based on the inferred amount of interference. A call admission controller controls call admission based on the amount of channel utilization that is considered with the amount of interference in the exposed terminal.
摘要:
A radio communication method, a radio communication system and a wireless terminal by which low power consumption and the flexibility of a network can be realized. A base station and wireless terminals change an intermittent receive period and the preamble length of data on the basis of characteristics of the multihop radio network to carry out the intermittent receiving of data. Thus, a wireless terminal relaying data can receive the data reliably and a useless boot-up of a receiving part and standby time can be largely reduced to achieve low power consumption.
摘要:
The present invention is to provide a wireless communication system that is capable of preventing occurrence of radio interference caused by radio wave used by a radio wave generator without requiring any improvement of existing wireless devices. The wireless communication system of the present invention includes: a radio wave generator (1) that uses at least a radio wave in a frequency band that overlaps a frequency band used by a wireless standard; and wireless devices (AP, STA) each of which uses a radio wave conforming to the wireless standard. The radio wave generator (1) transmits a dummy frame conforming to the wireless standard to the wireless devices near the radio wave generator (1) before generating the radio wave in the same frequency band as the frequency band used by the wireless standard. When the wireless devices (AP, STA) receive the dummy frame, the wireless devices (AP, STA) control themselves to stop using the radio wave in the frequency band that has radio interference caused by the radio wave generated from the radio wave generator (1).
摘要:
The present invention is to provide a wireless communication system that is capable of preventing occurrence of radio interference caused by radio wave used by a radio wave generator without requiring any improvement of existing wireless devices. The wireless communication system of the present invention includes: a radio wave generator (1) that uses at least a radio wave in a frequency band that overlaps a frequency band used by a wireless standard; and wireless devices (AP, STA) each of which uses a radio wave conforming to the wireless standard. The radio wave generator (1) transmits a dummy frame conforming to the wireless standard to the wireless devices near the radio wave generator (1) before generating the radio wave in the same frequency band as the frequency band used by the wireless standard. When the wireless devices (AP, STA) receive the dummy frame, the wireless devices (AP, STA) control themselves to stop using the radio wave in the frequency band that has radio interference caused by the radio wave generated from the radio wave generator (1).
摘要:
In order to settle a problem of suppressing degradation of a throughput of a communication system, a communication device is provided with a reception means which receives and accumulates a first datum which a first device transmits addressing a second device and a second datum which the second device transmits, a transmission means which transmits the first datum to the second device, a quality index acquisition means which acquires a first index which is a quality of communication between the first device and the second device and a second index which is a quality of communication between the communication device and the second device, and a judgment means which forces to transmit the accumulated first datum to the second device using the transmission means in the case of judging that the second index is better than the first index and a reception condition of the second datum shows that the second device does not receive normally the first datum.
摘要:
A path control system according to the present invention includes a network including a communication device (202) that communicates via a radio link that uses adaptive modulation, and a path control device (201) predicting a future modulation mode for the radio link and setting a communication path for the network based on a predicted mode that is the predicted modulation mode.
摘要:
A traffic performance in a tree type multi-hop wireless network of a CSMA/CA method is evaluated easily and highly precisely. A traffic performance evaluation system in the multi-hop wireless network includes: a performance index estimation unit regarding the multi-hop wireless network as a combination of a plurality of single-hop wireless networks and estimating a traffic performance index around each node of the network; and a performance index determination unit determining a traffic performance index of the whole multi-hop wireless network based on an estimation result of all the nodes by the performance index estimation unit.
摘要:
There is provided a packet joining method, program, and apparatus with an increased wireless utilization efficiency and a reduced packet delay. The packet joining method includes a step of performing Neighbor Discovery within a range reachable in one hop to detect neighboring audio terminals which are connectable over short-range radio and acquiring call information including audio session information such as whether the detected audio terminals are busy with respective calls and packetization period information and wireless transmission rate information, a step of selecting one as a joining destination from the list of detected connectable audio terminals on the basis of the call information by the criteria that occupancy time of wireless transmission becomes short and that a packet delay at the time of joining becomes small, a step of requesting packet joining of the selected audio terminal as the joining destination, and a step in which an audio terminal as a joining source starts a voice call upon receipt of a positive response from the audio terminal as the joining destination in response to the request for joining.
摘要:
A path control system according to the present invention includes a network including a communication device (202) that communicates via a radio link that uses adaptive modulation, and a path control device (201) predicting a future modulation mode for the radio link and setting a communication path for the network based on a predicted mode that is the predicted modulation mode.
摘要:
The present invention aims at providing a wireless communication system capable of lowering the load of the overload channel in the overload state in consideration of the allocation states of radio channels of adjacent base stations adjacent to the wireless base station. The wireless communication system in accordance with the present invention includes a plurality of wireless base stations (AP) capable of allocating a plurality of radio channels to be used for wireless communication and a load distribution apparatus (1) to conduct load distribution for a radio channel being used in the wireless base stations (AP) wherein the apparatus (1) obtains allocation states of radio channels of the respective wireless base stations (AP) to detect, on the basis of the obtained allocation states, an overload wireless base station (AP) which is using an overload radio channel in an overload state. Thereafter, the apparatus (1) allocates, on the basis of the obtained allocation states, a new channel to the overload wireless base stations (AP) to thereby conduct load distribution for the overload radio channel.