name: HARQ
full_form: Hybrid Automatic Repeat Request
context: The purpose of DCA is, on one side, the limitation of the interference (keeping required QoS) and on the other side, to maximise the system capacity due to minimising the reuse distance. Therefore, DCA algorithm performs the channel reallocation based on the interference measurement report in order to maximize the system capacity. However, the purpose of channel reallocation for inter-RAT measurement is to enlarge the measurement window, which is the somewhat different criteria compared with the channel reallocation in DCA. Hence, the impact on DCA depends on the frequency and duration of inter-RAT measurement occurrence and also the frequency of DCA operation and update period. However, detailed DCA procedure is not exactly specified in the current specification, it also means that the a lot of flexibility can be provided to implement DCA procedure in order to reduce the impact on it. Hence the impact on DCA will be little because we can modify the DCA initiation and operation
description: The Hybrid Automatic Repeat Request (HARQ) is a protocol used in the Enhanced Dedicated Channel (E-DCH) to manage retransmissions and improve transmission efficiency. It consists of multiple parallel HARQ processes, each identified by a unique identifier, which enable continuous transmissions while resources are available. The HARQ entity plays a crucial role in routing receiver feedback to the appropriate HARQ process based on timing and MAC-e or MAC-i PDU transmission.
explanation: HARQ is classified as a Protocol because it defines rules for data transmission and retransmission, specifically in the context of E-DCH. The provided context highlights its functionality in managing parallel processes, routing feedback, and determining process usage, which are all characteristic of a protocol.
section_title: 11.9.1.1.1	HARQ entity
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