Wireless Access Method for Narrow Beam Coverage in High-Frequency Networks
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Solution Overview
Problem
In high-frequency scenarios, the narrow beams generated by massive MIMO systems cannot cover all user equipment in a cell, leading to delayed network access due to increased path loss, as the beams are very narrow and cannot encompass all users.
Innovation Solution
A wireless access method involving the transmission of multiple signal sets on various resources, allowing user equipment to establish synchronization and access the network in a timely manner by sending synchronization signals on multiple resources and system information on corresponding resources, thereby reducing interference and signaling overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If massive MIMO beamforming is used to generate high antenna gain and compensate path loss, then signal coverage is improved, but beam width becomes very narrow and cannot cover all users in a cell
Solution Approach 1:
The patent segments the cell into multiple beam coverage areas by transmitting different signal sets (first signal sets and second signal sets) on different resources. The first signal sets are transmitted on first resources to enable synchronization for outer-loop beam communication, while second signal sets are transmitted on second resources for inner-loop beam communication. This segmentation allows the system to serve multiple users in different beam directions simultaneously without requiring a single wide beam.
Solution Approach 2:
The patent introduces a resource dimension (time, frequency, or code resources) to differentiate between signal sets. By multiplexing first signal sets and second signal sets on different resources, the system extends the coverage capability from a single beam direction to multiple beam directions without increasing the physical beam width, effectively adding a dimensional approach to coverage expansion.
2Loss of time
If multiple signal sets are transmitted on multiple resources to ensure synchronization, then access timeliness is improved, but signaling overhead and resource consumption increase
Solution Approach 1:
The first signal sets serve multiple functions: they enable synchronization across the cell, provide information for outer-loop beam communication, and facilitate user equipment to determine their location in the beam scanning sequence. The second signal sets similarly serve multiple purposes for inner-loop beam communication. This multi-functionality reduces the need for separate dedicated signals for each purpose, thereby reducing overall overhead.
Solution Approach 2:
The patent employs feedback mechanisms where user equipment feeds back information about received signal sets and their corresponding resources. This feedback allows the network to dynamically adjust subsequent signal transmission, ensuring that only necessary resources are allocated and that synchronization is achieved efficiently without redundant signaling.
Data Source
AI summary
A wireless access method and apparatus, the method including sending N first signal sets on N first resources, where N is an integer greater than 1, receiving Z response signals from a terminal for the N first signal sets, where each response signal of the response signals comprises indication information of a resource on which the respective first signal set of the N first signal sets is located, Z is an integer greater than or equal to 1, and Z is less than or equal to N, and sending M second signal sets on M second resources according to the Z response signals, where M is an integer greater than or equal to 1, and each second signal set of the M second signal sets corresponds to at least one of the N first signal sets.