Dynamic Time Domain Resource Allocation for NB-IoT Downlink
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Solution Overview
Problem
In narrowband Internet of Things (NB-IoT) systems, the existing downlink transmission resource allocation method often results in relatively large time domain resources being allocated, leading to idle resource fragments and a low downlink peak rate due to inefficient allocation of time domain resources.
Innovation Solution
The method involves determining initial time domain resource lengths and adjusting them based on preset thresholds and actual resource availability to ensure that adjacent resources can meet the requirements for downlink data transmission, thereby reducing resource fragments and increasing peak rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station increases the candidate T2 to ensure the next time domain resource length is sufficient for downlink data transmission, then the reliability of downlink data transmission is improved, but the time domain resource length T2 becomes larger, creating idle resource fragments and reducing the downlink peak rate
Solution Approach 1:
The patent applies dynamics by making the time domain resource length T2 adjustable rather than fixed. The base station dynamically selects T2 from a candidate set based on the actual length of the next time domain resource, ensuring T2 is sufficiently large to accommodate downlink data transmission while minimizing idle resource fragments. This dynamic adjustment resolves the contradiction between ensuring transmission reliability and maximizing downlink peak rate.
Solution Approach 2:
The patent changes the parameter T2 (time domain resource length) based on system conditions. By selecting T2 from a candidate set according to the next time domain resource length, the system optimizes resource allocation. This parameter change allows the system to adapt T2 to match actual transmission needs, reducing resource waste while ensuring sufficient resources for data transmission, thereby balancing reliability and productivity.
2Quantity of substance
If the base station allocates larger time domain resources to ensure sufficient resources for downlink data transmission, then the resource sufficiency is improved, but the resource allocation efficiency deteriorates due to increased idle fragments
Solution Approach 1:
The patent optimizes resource allocation efficiency by dynamically adjusting the time domain resource length T2 based on the next time domain resource length. The base station selects T2 from a candidate set to ensure sufficient resources for downlink data transmission while minimizing idle fragments. This parameter optimization resolves the contradiction between ensuring resource sufficiency and improving resource allocation efficiency.
3Adaptability or versatility
If the base station selects a larger T2 from the candidate set to accommodate variable downlink data amounts, then the adaptability to different data volumes is improved, but the resource waste increases due to larger idle fragments
Solution Approach 1:
The patent applies dynamics by making T2 adjustable from a candidate set based on actual system conditions. The base station dynamically selects the appropriate T2 value according to the next time domain resource length, ensuring adaptability to different downlink data volumes while minimizing resource waste. This dynamic selection resolves the contradiction between adaptability and resource waste.
Solution Approach 2:
The patent optimizes the parameter T2 to balance adaptability and resource efficiency. By selecting T2 from a candidate set based on the next time domain resource length, the system adapts to varying data volumes without consistently allocating excessive resources. This parameter optimization reduces idle fragments and resource waste while maintaining the ability to handle different data volumes.
Data Source
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AI summary
This application provides a downlink transmission resource allocation method and apparatus, and relates to the field of communications technologies, to increase a downlink peak rate of a cell. The method includes: determining, by a base station, a first time domain resource length and a second time domain resource length; adjusting, by the base station, the second time domain resource length if the first time domain resource length is greater than or equal to a preset threshold; and if a third time domain resource length is greater than or equal to a decreased second time domain resource length, determining, by the base station, the first time domain resource length as a first target time domain resource length, and determining, by the base station, the decreased second time domain resource length as a second target time domain resource length, where a first time domain resource is used by a terminal to switch from a first state to a second state, the first state is a state in which the terminal receives scheduling information, the second state is a state in which the terminal receives downlink data, a second time domain resource is used by the terminal to receive the downlink data, and a third time domain resource is a next time domain resource that is adjacent to the first time domain resource and that is used to transmit the downlink data.