Cell Group Handover Sequencing for Multi-Cell SRS Transmission
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Solution Overview
Problem
In 5G mobile communication systems, the imbalance between uplink and downlink service loads necessitates frequent cell handovers by terminal devices, leading to data transmission losses and reduced performance due to the limited uplink capability of terminal devices in sending sounding reference signals (SRS) across multiple cells.
Innovation Solution
A method for terminal devices to perform cell handovers based on configured cell groups, where handovers are sequenced to reduce the number of handovers by alternating between first-type cells (without PUCCH/PUSCH configuration) and second-type cells (with PUCCH/PUSCH configuration), ensuring timely and efficient transmission of reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device performs frequent cell handovers to obtain downlink channel information of multiple cells, then the downlink transmission performance is improved, but the data transmission loss increases and transmission performance deteriorates due to limited uplink capability
Solution Approach 1:
The patent segments the cell group into multiple first-type cells and second-type cells based on their functionality. First-type cells are used for obtaining downlink channel information through SRS measurement, while second-type cells maintain uplink capabilities for PUCCH/PUSCH transmission. This segmentation allows the terminal to efficiently obtain downlink channel information without requiring frequent handovers across all cells, thereby reducing data transmission loss while improving downlink transmission performance.
2Measurement precision
If the terminal device sends SRS in multiple cells to obtain downlink channel information, then the downlink precoding accuracy is improved, but the device complexity increases due to limited uplink sending capability
Solution Approach 1:
The patent divides cells into first-type cells (without PUCCH/PUSCH) and second-type cells (with PUCCH/PUSCH). The terminal device sends SRS only in first-type cells to obtain downlink channel information, while maintaining uplink capabilities in second-type cells. This segmentation reduces the number of cells where SRS needs to be transmitted, thereby reducing device complexity while still achieving accurate downlink channel information measurement.
Solution Approach 2:
Second-type cells serve multiple functions: they maintain uplink capabilities for PUCCH/PUSCH transmission and can also provide downlink channel information through SRS measurement when needed. This multi-functionality reduces the need for the terminal to frequently switch between different cell types, thereby reducing device complexity while maintaining measurement precision.
3Reliability
If the terminal device performs handover to another cell to send reference signal, then the downlink channel information is obtained, but the handover frequency increases and transmission performance decreases
Solution Approach 1:
The patent segments cells into first-type and second-type based on their configuration. By designating specific first-type cells for SRS transmission, the terminal can obtain downlink channel information without performing frequent handovers. The segmentation allows the terminal to remain connected to a second-type cell for stable uplink transmission while periodically obtaining downlink channel information from first-type cells, thereby maintaining high data transmission performance.
4Area of stationary object
If the terminal device supports downlink carrier aggregation in multiple cells, then the bandwidth is increased, but the uplink transmission capability is limited to single cell
Solution Approach 1:
The patent segments the cell group into first-type cells and second-type cells. Second-type cells are configured with PUCCH/PUSCH for uplink transmission, while first-type cells are used for SRS measurement. This segmentation allows the terminal to support downlink carrier aggregation across multiple cells for increased bandwidth while maintaining uplink transmission capability in second-type cells, thereby resolving the adaptability limitation.
Solution Approach 2:
Second-type cells act as intermediaries that provide uplink transmission capabilities (PUCCH/PUSCH) while the terminal obtains downlink channel information from first-type cells through SRS measurement. This intermediary role of second-type cells allows the system to maintain both wide downlink bandwidth and adequate uplink transmission capability.
Data Source
AI summary
This application discloses a cell handover method and a related apparatus, and relates to the communication field. The method includes a terminal device determining at least one cell group, where each cell group of the at least one cell group includes at least one first-type cell. The terminal device performs cell handover, and sends a reference signal in a cell to which the terminal device performs handover. That the terminal device performs cell handover, and sends the reference signal in the cell to which the terminal device performs handover includes: for the at least one cell group including a first cell group and a second cell group, after sending a reference signal in a first-type cell in the first cell group, the terminal device performs handover to at least one second-type cell, and performs handover to a first-type cell in the second cell group for sending a reference signal.