Dynamic Uplink Cell Activation for 5G Coverage
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Solution Overview
Problem
In communication systems, particularly in 5G and beyond, the simultaneous use of multiple uplink cells by user equipment leads to decreased uplink cell coverage due to the distribution of transmission power across multiple cells, resulting in reduced effectiveness of uplink transmissions.
Innovation Solution
A method and apparatus that dynamically manage uplink cells by activating or deactivating them based on information received from a base station, allowing for prioritization and optimization of uplink transmissions, thereby enhancing coverage by limiting the number of active cells during simultaneous transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple uplink cells are used simultaneously for uplink transmission, then transmission diversity and reliability are improved, but uplink cell coverage decreases due to distribution of transmission power
Solution Approach 1:
The patent implements dynamic activation and deactivation of uplink cells based on received power conditions. The base station receives uplink transmissions from multiple cells, evaluates the received power levels, and dynamically determines which cells should remain active or be deactivated. This dynamic adjustment resolves the contradiction by adapting the number of active cells to current channel conditions, maintaining reliability when needed while preserving coverage when power is limited.
Solution Approach 2:
The system changes the operational state parameter of uplink cells from static to dynamic based on received power thresholds. When received power exceeds certain thresholds, cells are deactivated to concentrate power and maintain coverage. When power conditions permit, more cells are activated to enhance reliability through diversity. This parameter change approach allows the system to optimize between coverage and reliability based on real-time conditions.
2Reliability
If the number of active uplink cells is increased, then transmission diversity is improved, but transmission power per cell is reduced
Solution Approach 1:
The base station dynamically adjusts the number of active uplink cells based on received power measurements. When channel conditions are good and received power is sufficient, more cells are activated to provide transmission diversity. When power is limited, fewer cells are kept active to concentrate the available transmission power. This dynamic control resolves the contradiction between diversity and power per cell.
Solution Approach 2:
The system implements a feedback mechanism where the base station measures received power from uplink cells and uses this information to control cell activation/deactivation decisions. The base station feeds back control signals to the user equipment indicating which cells should be active. This closed-loop feedback allows the system to optimize the trade-off between transmission diversity and power per cell based on actual channel conditions.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method for user equipment according to an embodiment of the present disclosure comprises the steps of: receiving, from a base station, first information indicating activation or deactivation of at least one uplink cell of a first cell group; transmitting, to the base station, second information indicating that the first information has been received; identifying, on the basis of the first information, whether or not, from among the at least one uplink cell, a first uplink cell has been activated; and if the first uplink cell has been activated, carrying out an uplink transmission via the first uplink cell.