Dynamic PDCCH Resource Allocation for LTE Data Transmission
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Solution Overview
Problem
In LTE systems, time-frequency resource waste occurs when the downlink control channel is not fully occupied, leading to inefficient resource utilization during data transmission.
Innovation Solution
The method involves a base station indicating unoccupied time-frequency resources in the preset control channel domain to the UE, allowing for reuse of these resources for downlink data channel scheduling, thereby improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a self-contained channel sending method is used to embed PDCCH into PDSCH, then resource overheads of PDCCH are reduced, but time-frequency resource waste occurs when PDCCH does not fully occupy the preset resource domain
Solution Approach 1:
The patent applies dynamics by making the PDCCH resource allocation flexible rather than fixed. The base station dynamically adjusts the occupation of time-frequency resources in the control channel domain based on actual control information transmission needs. When control information requires fewer resources, the PDCCH occupies only the necessary portion, and the remaining resources are released for PDSCH use, thereby eliminating resource waste while maintaining efficient resource utilization.
Solution Approach 2:
The patent changes the parameter of resource allocation from a fixed preset domain to a dynamically adjustable occupation ratio. By modifying how much of the control channel domain is occupied by PDCCH based on actual transmission requirements, the system optimizes both resource overhead reduction and time-frequency resource utilization, resolving the contradiction between these two objectives.
2Productivity
If the PDCCH is embedded into PDSCH for sending, then frequency domain interleaving is performed to reduce overheads, but the preset PDCCH time-frequency resource domain is not fully occupied causing resource waste
Solution Approach 1:
The patent makes the PDCCH resource occupation dynamic within the embedded structure. Instead of allocating a fixed portion of the time-frequency domain to PDCCH, the system adjusts the occupation based on actual control information size and requirements. This dynamic adjustment ensures that when control information is small, fewer resources are consumed by PDCCH, allowing more resources to be available for PDSCH, thus improving overall data transmission efficiency while eliminating resource waste.
Solution Approach 2:
The patent changes the resource allocation parameter from a static preset domain to a dynamic occupation ratio. By adjusting the proportion of time-frequency resources occupied by PDCCH based on actual transmission needs, the system optimizes the balance between control channel functionality and data channel efficiency, resolving the contradiction between maintaining data transmission efficiency and preventing resource waste.
3Speed
If a conventional TTI of 1 millisecond is used, then control region can be properly established, but transmission delay is reduced when using short TTI with fewer symbols
Solution Approach 1:
The patent applies multi-functionality by enabling the control channel domain to serve dual purposes: when PDCCH occupies the domain, it provides control functions; when PDCCH does not fully occupy the domain, the remaining resources automatically serve data transmission functions. This universal resource allocation mechanism works seamlessly with both conventional and short TTI structures, supporting fast transmission speeds while managing resource allocation complexity through a unified framework.
Data Source
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AI summary
Embodiments of the present invention provide a data transmission method and apparatus. The method includes: sending, by a base station to UE, a downlink control channel used to schedule downlink data; and indicating, by the base station, a first time-frequency resource domain and a second time-frequency resource domain by using the downlink control channel, where a downlink data channel is sent on a time-frequency resource that is in the first time-frequency resource domain and that does not belong to the second time-frequency resource domain. In the data transmission method provided in the embodiments of the present invention, time-frequency resource utilization can be improved.