Radio access communication system capable of preventing packet loss
AssigneeNEC Corporation
InventorsYukinori Suda, Morihisa Momona
Life of this patent
Estimating the term…
Abstract
A radio terminal device informs a radio base station of entrance into a communication suppress mode such as a power saving mode by transmitting a state transition informing packet to the radio base station, when detecting deterioration of a communication. The packet received by the radio base station in this state is retained by the radio base station. When receiving an acknowledgment signal from the radio base station, the radio terminal device changes the setting of a receiver to a radio channel different from a radio channel used in the communication with the radio base station, and searches for other radio base stations.
Claims47
A radio access communication system including a plurality of radio base stations and a radio terminal device connectable with said plurality of radio base stations, wherein
- said radio terminal device includes judgment means for judging whether communication conditions have deteriorated;
- and
- when connected to a first radio base station included in said plurality of radio base stations, said radio terminal device transmits a transmission suppress signal for suppressing a communication with said radio terminal device to said first radio base station if the communication conditions with said first radio base station deteriorate, and said radio terminal device searches for the communication conditions with other radio base stations.
A radio access communication system including a plurality of radio base stations and a radio terminal device connectable with said plurality of radio base stations, wherein
- each of said radio base stations includes judgment means for judging whether communication conditions have deteriorated;
- and
- a first radio base station, which is included in said plurality of radio base stations and connected to said radio terminal device, controls a communication with said radio terminal device if the communication conditions with said radio terminal device deteriorate, and transmits a transmission suppress signal to said radio terminal device, and lets said radio terminal device search for the communication conditions with other radio base stations.
A radio access communication system including a plurality of radio base stations and a radio terminal device connectable with said plurality of radio base stations, wherein
- said radio terminal device includes judgment means for judging whether communication conditions have deteriorated;
- when connected to a first radio base station included in said plurality of radio base stations, said radio terminal device transmits a transmission suppress signal for suppressing a communication with said radio terminal device to said first radio base station if the communication conditions with said first radio base station deteriorate, and said radio terminal device searches for the communication conditions with other radio base stations;
- and
- said radio terminal device transmits a control information requesting signal to detect whether a radio base station exists, when searching for the communication conditions with said other radio base stations.
A radio terminal device connectable with a plurality of radio base stations, wherein
- said radio terminal device can operate in an operation mode of either a normal mode or a communication suppress mode;
- and
- said radio terminal device includes informing means for informing of communication conditions with a radio base station being connected to among said plurality of radio base stations, and control means for changing said operation mode to said communication suppress mode when detecting deterioration of said informed communication conditions.
A radio base station for communicating with a radio terminal device, including informing means for informing of communication conditions with said radio terminal device, and control means for instructing said radio terminal device to transmit a transmission suppress signal, when said communication conditions are monitored and deterioration of the communication conditions is detected.
A radio base station connectable with a radio terminal device capable of transmitting a transmission suppress signal, said radio base station including:
- receiving means for receiving said transmission suppress signal from said radio terminal device;
- and control means for transmitting a response signal directed to said transmission suppress signal to said radio terminal device and switching an operation mode for said radio terminal device to a communication suppress mode, when detecting said transmission suppress signal.
A radio access communication method between a plurality of radio base stations and a radio terminal device connectable with the plurality of radio base stations, said radio access communication method including the steps of:
- detecting deterioration of communication conditions between said radio terminal device in a connected state and said radio base stations;
- and
- suppressing the communication between said radio terminal device in a connected state and said radio base stations, and storing packets transmitted and received by said radio terminal device and said radio base stations, when deterioration of said communication conditions is detected.
A radio access communication method between a radio base station and a radio terminal device capable of communicating asynchronously with said radio base station, said radio access communication method including the steps of:
- detecting deterioration of communication conditions in one of said radio terminal device or said radio base station;
- and
- transmitting a transmission suppress signal for suppressing the communication to the other one of said radio base station or said radio terminal device;
- and wherein
- the step of searching for the communication conditions with other radio base station is executed in said radio terminal device, in connection with transmission and reception of said transmission suppress signal.
A program for a radio terminal device capable of operating in an operation mode of either a normal mode or a communication suppress mode, and connectable with a plurality of radio base stations, said program includes the steps of:
- judging which operation mode said radio terminal device is operating in, said normal mode or said communication suppress mode;
- judging whether communication conditions with a radio base station being connected to have deteriorated, among said plurality of radio base stations;
- and
- changing said operation mode to said communication suppress mode when said communication conditions are judged to have deteriorated.
A program for a radio base station connected to a radio terminal device capable of operating in an operation mode of either a normal mode or a communication suppress mode, said program including the steps of:
- judging the operation mode of said radio terminal device;
- buffering data for said radio terminal device when the operation mode of said radio terminal device is judged to be said communication suppress mode;
- and
- informing said radio terminal device that the data is buffered.
A program for a radio base station connectable with a radio terminal device capable of transmitting a transmission suppress signal, said program including the steps of:
- judging whether the transmission suppress signal from said radio terminal device is received;
- transmitting a response signal directed to said transmission suppress signal to said radio terminal device, when the transmission suppress signal from said radio terminal device is judged to be received;
- and
- switching an operation mode in said radio terminal device to a communication suppress mode.
Dependencies are inferred from the claim text.