Mobile communication system
AssigneeNEC Corporation
InventorsHiroyuki Tomishima, Hirofumi Shiotsuki
Life of this patent
Estimating the term…
Abstract
By detecting a degraded state of wireless transmission quality due to steady occurrence of re-transmission in an early stage to lead to a call connection, a service quality is made sure, an excess time charge on an end user is prevented and wireless resources are utilized efficiently. A base station controller monitors a PDU transmission state in a wireless link to a mobile station in call unit, calculates an occurrence rate of re-transmission as an evaluation value of wireless transmission quality, determines a degradation of the wireless transmission quality when the occurrence rate of re-transmission becomes equal to or larger than a predetermined threshold value and performs a disconnection processing for the call.
Claims8
A mobile communication system comprising:
- a base station controller for performing an acknowledged mode wireless link control protocol processing with respect to a mobile station,
- wherein said base station controller:
- monitors a (protocol data unit) transmission state in a wireless link to said mobile station in call unit,
- calculates an occurrence rate of re-transmission as an evaluation value of wireless transmission quality,
- determines that the wireless transmission quality is degraded when the occurrence rate of re-transmission becomes equal to or larger than a predetermined threshold value, and
- performs a disconnection processing for the call,
- wherein said occurrence rate of re-transmission is calculated according to [total number of re-transmission states (number of PDUs of managed PDUs, which are in re-transmission state)]/[total number of the managed PDUs].
A mobile communication system comprising:
- a base station controller for performing an acknowledged mode wireless link control protocol processing with respect to a mobile station,
- wherein said base station controller:
- monitors a (protocol data unit) transmission state in a wireless link to said mobile station in call unit,
- calculates an occurrence rate of re-transmission as an evaluation value of wireless transmission quality,
- determines that the wireless transmission quality is degraded when the occurrence rate of re-transmission becomes equal to or larger than a predetermined threshold value, and
- performs a disconnection processing for the call,
- wherein said occurrence rate of re-transmission is calculated according to [total number of re-transmission states (number of PDUs of managed PDUs, which are in re-transmission state)]/[PDU transmission window size].
A mobile communication system comprising:
- a base station controller for performing an acknowledged mode wireless link control protocol processing with respect to a mobile station,
- wherein said base station controller:
- monitors a (protocol data unit) transmission state in a wireless link to said mobile station in call unit,
- calculates an occurrence rate of re-transmission as an evaluation value of wireless transmission quality,
- determines that the wireless transmission quality is degraded when the occurrence rate of re-transmission becomes equal to or larger than a predetermined threshold value, and
- performs a disconnection processing for the call, a maintenance terminal connected to said base station controller, for setting the threshold value of the occurrence rate of re-transmission and receiving the report of the degraded state of the wireless transmission quality.
A mobile communication system comprising a base station controller for performing an acknowledged mode wireless link control protocol processing with respect to a mobile station, wherein said base station controller monitors a (protocol data unit) transmission state in a wireless link to said mobile station in unit of all calls covered by every base station, calculates a total number of re-transmission states as an evaluation value of wireless transmission quality for every call, determines a degradation of the wireless transmission quality when the total number of re-transmission states becomes equal to or larger than a predetermined threshold value, calculates a call rate of quasi degraded state of all calls covered by said base station, determines a degradation of the wireless transmission quality in unit of all calls when the call rate becomes equal to or larger than a predetermined threshold value and performs a report processing for reporting the quasi degraded state.
Dependencies are inferred from the claim text.