Multi-Frequency Communication Cell Coordination for Energy-Saving Access
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Solution Overview
Problem
In communication systems like the new radio (NR) system, the transmission of synchronization signals, system information blocks, and paging messages necessitates continuous downlink slots, preventing base stations from achieving energy savings through symbol power saving methods due to high power consumption.
Innovation Solution
Coordination and cooperation among co-coverage cells in different frequency bands to reduce the number of system broadcast messages, allowing one cell to enter an energy-saving state with assistance from another cell, thereby reducing the need for camping and initial access functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous downlink slots are allocated for transmitting synchronization signals, system information blocks, and paging messages, then communication reliability is improved, but power consumption increases exponentially
Solution Approach 1:
The patent segments the cell coverage area into multiple frequency bands (first frequency band and second frequency band). The first frequency band cell transmits synchronization signals and system information, while the second frequency band cell provides assistance for initial access. This segmentation allows the first frequency band cell to reduce downlink slot transmission while maintaining communication reliability through coordinated multi-band operation.
Solution Approach 2:
The second frequency band cell acts as an intermediary to assist terminal devices in accessing the first frequency band cell. By providing assistance information and enabling cross-band access, the second frequency band cell allows the first frequency band cell to enter energy-saving states without compromising initial access functionality, thus resolving the contradiction between reliability and power consumption.
2Use of energy by moving object
If a cell enters energy-saving state by stopping RMSI/OSI/paging message transmission, then power consumption is reduced, but initial access functionality is affected
Solution Approach 1:
The patent separates the initial access functionality into two frequency bands: the first frequency band cell focuses on transmitting synchronization signals and system information, while the second frequency band cell provides assistance for initial access. This segmentation allows the first frequency band cell to stop transmitting RMSI/OSI/paging messages and enter energy-saving state without affecting initial access, as terminal devices can utilize the second frequency band cell for assistance.
Solution Approach 2:
The second frequency band cell serves as an intermediary that provides assistance information to terminal devices, enabling them to access the first frequency band cell even when it is in energy-saving state. This intermediary mechanism preserves initial access functionality while allowing the first frequency band cell to reduce power consumption by stopping routine message transmissions.
3Loss of energy
If downlink slots are reserved for symbol power saving, then energy saving is achieved, but system broadcast message transmission is reduced
Solution Approach 1:
The patent segments the broadcast message transmission function between two frequency bands. The first frequency band cell transmits synchronization signals and system information blocks, while the second frequency band cell provides paging messages and assistance information. This segmentation allows the first frequency band cell to reserve downlink slots for symbol power saving without completely losing system broadcast message transmission capability, as the second frequency band cell compensates for the reduced transmission.
4Productivity
If co-coverage cells in different frequency bands coordinate for energy saving, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent divides the coverage area into two frequency bands with clearly defined functions: the first frequency band cell handles synchronization and system information, while the second frequency band cell provides assistance for initial access and paging. This functional segmentation simplifies the coordination mechanism compared to full multi-band operation, as each band has specific responsibilities, thereby improving energy saving efficiency without excessive complexity increase.
Data Source
AI summary
This application provides a communication method and apparatus. The method may include: A cell in a first frequency range determines to enter an energy saving state. A terminal device accesses a cell in a second frequency range through cell selection. When the terminal device needs to enter the cell in the first frequency range, the cell in the second frequency range assists the terminal device in accessing the cell in the first frequency range. In this application, energy saving can be implemented through assistance between a plurality of cells. For example, the cell in the first frequency range may enter the energy saving state. Communication performance can be ensured. For example, the cell in the second frequency range may assist the terminal device in accessing the cell in the first frequency range in the energy saving state.