Semi-Persistent Scheduling QCL Management in Multi-Cell Wireless Systems
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently transmitting and receiving downlink signals due to limitations in scheduling information and quasi co-location (QCL) management, which affect signal processing and interference mitigation across multiple cells.
Innovation Solution
Implementing a semi-persistent scheduling (SPS) scheme that uses first and second type scheduling information to manage QCL information for downlink signal transmission and reception, allowing for resource assignment and default QCL settings to optimize signal processing across multiple cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-persistent scheduling is implemented with multiple scheduling information types, then resource allocation efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments scheduling information into two distinct types: first type scheduling information for initial resource allocation and second type scheduling information for subsequent allocations. This segmentation allows the system to optimize resource allocation efficiency by using different information types for different scheduling scenarios, while managing complexity through clear differentiation of functions.
Solution Approach 2:
The patent implements dynamic switching between first and second type scheduling information based on system conditions and requirements. The network can dynamically select which type of scheduling information to use for different downlink transmissions, enabling flexible resource allocation that adapts to changing traffic patterns and system states.
2Reliability
If QCL information is dynamically changed based on scheduling information type, then signal processing performance is improved, but processing complexity increases
Solution Approach 1:
The patent pre-configures QCL information associations with different scheduling information types. Before actual downlink signal reception, the user equipment is provided with indications of which QCL information to apply based on the received scheduling information type. This preliminary configuration enables efficient signal processing during reception without requiring complex real-time QCL determination.
Solution Approach 2:
The patent introduces scheduling information type as an intermediary that links the network's transmission configuration to the user equipment's reception processing. This intermediary mechanism simplifies QCL management by providing a clear mapping between scheduling information types and corresponding QCL information, reducing the complexity of direct QCL configuration management.
3Object-affected harmful factors
If multiple QCL information configurations are supported, then interference mitigation capability is improved, but information management complexity increases
Solution Approach 1:
The patent applies different QCL information configurations locally to different downlink signal receptions based on the scheduling information type. Instead of using a single uniform QCL configuration for all transmissions, the system tailors the QCL information to match the specific scheduling scenario, improving interference mitigation for each case while managing information overhead through targeted application.
Data Source
AI summary
Disclosed is a method for a terminal for receiving a downlink signal from a plurality of cells according to the semi-persistent scheduling (SPS) method in a wireless communication system. Specifically, the method comprises the steps of: receiving, in a first subframe, a first or second type scheduling information indicating an activation, according to the SPS method, from a serving cell from among the plurality of cells; and, in the first subframe and a second subframe configured via a higher layer after the first subframe, receiving the downlink signal from one cell from among the plurality of cells in accordance with resource allocation information comprised in the first or the second type scheduling information, wherein the first type scheduling information comprises quasi co-location (QCL) information for the serving cell and the one cell, and the QCL information applied in the first and second subframes is updated in accordance with the type of the scheduling information.