Section: 5.18 Recommended Bit Rate
Content: The recommended bit rate procedure is used to provide the MAC entity with information about the bit rate which the eNB recommends. The bit rate is the recommended bit rate of the physical layer. Averaging window of default value 2000 ms will apply, as specified in TS 26.114[ IP Multimedia Subsystem (IMS); Multimedia telephony; Media handling and interaction ]  [16]. The eNB may transmit the Recommended bit rate MAC control element to the MAC entity to indicate the recommended bit rate for the UE for a specific logical channel and a specific direction (either uplink or downlink). Upon reception of a Recommended bit rate MAC control element the MAC entity shall: - indicate to upper layers the recommended bit rate for the indicated logical channel and direction The MAC entity may request the eNB to indicate the recommended bit rate for a specific logical channel and a specific direction. If the MAC entity is requested by upper layers to query the eNB for the recommended bit rate for a logical channel and for a direction (i.e. for uplink or downlink), the MAC entity shall: - if a Recommended bit rate query for this logical channel and this direction has not been triggered: - trigger a Recommended bit rate query for this logical channel, direction, and desired bit rate. If the MAC entity has UL resources allocated for new transmission for this TTI the MAC entity shall: - for each Recommended bit rate query that the Recommended Bit Rate procedure determines has been triggered and not cancelled: - if bitRateQueryProhibitTimer for the logical channel and the direction of this Recommended bit rate query is configured, and it is not running; and - if the MAC entity has UL resources allocated for new transmission for this TTI and the allocated UL resources can accommodate a Recommended bit rate MAC control element plus its subheader as a result of logical channel prioritization: - instruct the Multiplexing and Assembly procedure to generate the Recommended bit rate MAC control element for the logical channel and the direction of this Recommended bit rate query; - start the bitRateQueryProhibitTimer for the logical channel and the direction of this Recommended bit rate query - cancel this Recommended bit rate query.