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Thursday, January 16, 2014

UMTS: Traffic Volume Measurement (HSDPA, HSUPA)

Traffic Volume Measurement is used for purpose of Rate reallocation at UE. The monitored traffic volume corresponds to the amount of data in number of bytes that is available for transmission and re-transmission in RLC layer- Buffer Occupancy.
When an UE supporting Release 5 and below release is used then rate adaptation can be achieved. As the buffer occupancy goes lower than the threshold, Timer will be started. If the buffer occupancy goes above the threshold then it will stopped. If the timer expires then data rate will be adapted to lower rate for the UE.
Event 4a: Transport Channel Traffic Volume exceeds an absolute threshold.
Event 4b: Transport Channel Traffic Volume becomes smaller than an absolute threshold.

Traffic volume measurements may be configured by RRC to assist with dynamic radio bearer control. In general, RLC buffer payload, Average of RLC buffer payload or Variance of RLC buffer payload will be configured to report.

Traffic volume measurement reports can be triggered periodically and event triggered based on the reporting criteria specified in the measurement control message.

Traffic volume measurement information will be communicated in SIB11 and during the radio bearer setup stage.

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