RMSI Beam Group Scheduling to Cut Time Domain Overhead
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Solution Overview
Problem
The existing methods for transmitting Remaining Minimum System Information (RMSI) result in high time domain resource overheads, which limits the efficiency of downlink data transmission and increases power consumption in network devices.
Innovation Solution
The network device determines a first sending periodicity and corresponding time domain resources to transmit RMSI using only a selected beam group, repeatedly transmitting this group within the periodicity to reduce resource overheads and minimize impairment of combination gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device transmits RMSI by traversing each beam in the transmission repetition periodicity, then the coverage area requirement is satisfied, but the time domain resource overheads for transmitting RMSI becomes large
Solution Approach 1:
The patent segments the plurality of beams into a first beam group and other beam groups. The first beam group is selected based on the terminal device's capability to support multiple beams simultaneously, allowing RMSI to be transmitted only through this subset of beams rather than all beams, thereby reducing time domain resource overheads while maintaining coverage for supported terminal devices
Solution Approach 2:
The patent applies partial action by transmitting RMSI only through the first beam group instead of all beams in the plurality of beams. This partial transmission approach reduces the time domain resource overheads proportion while still providing adequate coverage for terminal devices that support multiple beam reception, achieving a balance between resource efficiency and coverage reliability
2Speed
If the transmission repetition periodicity is small, then the RMSI transmission frequency is high, but the proportion of time domain resource overheads for transmitting RMSI becomes large
Solution Approach 1:
The patent segments the beam set into a first beam group for RMSI transmission, allowing the system to maintain high transmission repetition frequency while reducing the proportion of time domain resources consumed. By limiting RMSI transmission to only the first beam group rather than all beams, the resource overhead proportion is reduced even when transmission occurs frequently
Solution Approach 2:
The patent changes the parameter of beam group selection based on terminal device capability. By dynamically determining which beams form the first beam group according to the terminal's multi-beam support capability, the system can optimize the balance between transmission frequency and resource overhead proportion, reducing waste when high-frequency transmission is required
Data Source
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Figure 1B
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AI summary
Embodiments of this application provide a system information sending method and a communication apparatus. The method includes: A network device determines, based on a transmission repetition periodicity of RMSI, a first sending periodicity and a time domain resource corresponding to the first sending periodicity, and sends the RMSI to a terminal device based on the first sending periodicity and the time domain resource corresponding to the first sending periodicity. The transmission repetition periodicity is a transmission repetition periodicity for transmission of the RMSI by using each of a plurality of beams. The time domain resource corresponding to the first sending periodicity includes: a time domain resource that is in a time domain resource corresponding to the transmission repetition periodicity and that is used for transmitting a first beam group in the plurality of beams and not for transmitting a beam other than the first beam group in the plurality of beams. That is, RMSI does not need to be sent by using each beam in one transmission repetition periodicity, thereby reducing a proportion of time domain resource overheads for transmitting the RMSI. Further, the first beam group is repeatedly transmitted in the first sending periodicity, so that a degree of impairment of an RMSI combination gain can be reduced.