TFRC Selection Maximizing Leftover Codes and Power
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Solution Overview
Problem
Current methods for selecting transport format resource combinations in downlink communication between a base station and mobile terminals do not efficiently optimize resource allocation, leading to suboptimal use of resources and potential interference issues.
Innovation Solution
A method that determines and selects transport format resource combinations (TFRCs) to maximize the product of leftover channelisation codes and transmission power for each mobile terminal, ensuring minimal resource usage while maintaining nearly optimal resources for further terminals, and considers interference reduction by selecting the lowest transmission power when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If transport format resource combinations are selected to maximize data transmission for individual mobile terminals, then data transmission rate is improved, but resource allocation efficiency deteriorates
Solution Approach 1:
The patent changes the selection criterion from maximizing individual terminal data rate to maximizing the product of leftover channelisation codes and transmission power. This parameter transformation enables the system to achieve better overall resource allocation efficiency while still maintaining high data transmission rates for individual terminals by selecting TFRCs that leave optimal residual resources.
2Reliability
If transmission power is increased to improve signal quality and data rate, then communication reliability is improved, but interference to other terminals increases
Solution Approach 1:
The patent implements a feedback mechanism where the selection of TFRC for one terminal automatically determines the leftover resources available for subsequent terminals. By maximizing the product of leftover channelisation codes and transmission power, the system dynamically adjusts transmission power to achieve optimal signal quality while minimizing interference to other terminals through efficient resource reservation.
3Speed
If resources are allocated aggressively to maximize individual terminal performance, then data rate is improved, but available resources for other terminals are reduced
Solution Approach 1:
The patent performs preliminary action by calculating and maximizing the leftover resources (channelisation codes and transmission power) before allocating them to subsequent terminals. This approach ensures that each terminal receives optimal resources while preserving maximum remaining resources for other terminals, thereby maintaining high data rates across multiple terminals simultaneously.
Data Source
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AI summary
A method of selecting Transport Format Resource Combinations (TFRCs) for usage during a transmission time interval (TTI) in a transmission channel is disclosed. The transmission channel is used for downlink communication between a base station (112) and mobile terminals (106, 108). According to an embodiment, the method comprises the steps: - determining a first set of TFRCs (128) from a given TFRC table (126) for a first mobile terminal (106) served by the base station (112), each TFRC of the set of TFRCs specifying the same transport block size (TBS), a specific number of channelisation codes and a specific transmission power for the downlink communication with the first mobile terminal; - selecting for the first mobile terminal a first TFRC from the set of TFRCs such that a product (132) of the left-over number of channelisation codes and the left-over transmission power is maximal, the left-over number of channelisation codes being determined by the difference between the number of channelisation codes available for the first mobile terminal in the TTI and the number of the channelisation codes specified by the first TFRC, the left-over transmission power being determined by the difference between the transmission power available for the downlink communication with the first mobile terminal in the TTI and the transmission power specified by the first TFRC.