name: SCM
full_form: Spacial Channel Model
context: payload may be changed but care should be taken to preserve the higher layer data order. - Indicates the Queue ID and TSN to the HARQ entity for each MAC-hs PDU to be transmitted; - Schedules new transmissions and retransmissions: - Based on the status reports from HARQ Processes the scheduler determines if either a new transmission or a retransmission should be made. A new transmission can however be initiated on a HARQ process at any time. Based on a delay attribute provided by upper layers, the scheduler may decide to discard any 'out-of-date' MAC-hs SDU. - Determines the redundancy version: - The scheduler determines a suitable redundancy version for each transmitted and retransmitted MAC-hs PDU and indicates the redundancy version to lower layer. - Determines the TDD HCSN: - Increment UE specific HCSN for each HS-SCCH transmission. In 1.28Mcps TDD multi-frequency HS-DSCH cell, UE maintains the respective HCSN for each carrier independently. NOTE: For TDD, the scheduler should not
description: The Spatial Channel Model (SCM) is a technology used to simulate the behavior of radio channels in wireless communication systems, particularly for Multiple Input Multiple Output (MIMO) schemes. It takes into account transmitter and receiver antenna correlation, allowing for more accurate modeling of spatial sub-channels and beamforming techniques.
explanation: The context describes SCM as a channel model used for simulating MIMO performance, indicating its role as a technology standard for wireless communication systems. The mention of its extension (SCME) for higher bandwidths further solidifies its classification under the Technology category.
section_title: A.2.1.2.2	Spatial channel model (SCM)
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