name: IHR
full_form: Improved HARQ Retransmission
context: scenarios where the Node-B uses beamforming mode âgrid âof fixed beamsâ or âflexible beamâ with one SCPICH assigned per beam, there are additional considerations. For this particular case, a UE transition from one beam to another require higher layer signalling, since the UE needs to get informed that it should use another SCPICH. To be able to handle this the following signalling between Node-B and RNC is needed for the case where beamforming is applied with a SCPICH per beam: For each UE, the Node-B should measure the uplink received power of the of the pilot symbols in all the beams where a SCPICH is assigned. These measurements should be locally averaged in the Node-B before they are reported to the RNC. The length of the power averaging window is selected by the RNC. In order to reduce the Iub signalling load, we could chose to only report the strongest measurements to the RNC. Based on these measurements, the RNC determines whether a beam handover is needed or not. Hence, the
description: Improved HARQ Retransmission (IHR) is a procedure in the 3GPP specification that aims to enhance the efficiency of Hybrid Automatic Repeat Request (HARQ) retransmissions. It is designed to reduce call drop ratios, especially in poor radio conditions. The IHR mechanism involves adjusting the number of retransmissions and transmission power to optimize system capacity and user experience.
explanation: IHR is classified as a Procedure because it outlines a specific sequence of operations (retransmissions and power adjustments) to achieve improved call drop ratios. The context highlights its impact on system capacity, radio conditions, and the benefits of adjusting retransmission numbers and transmission power.
section_title: 5.3.1.4	Evaluation
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biotag_Description: B-Procedure,I-Procedure,I-Procedure,O,O,O,O,O,O,B-Organization,O,O,O,O,O,O,O,O,B-Protocol,I-Protocol,I-Protocol,I-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Procedure,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O