Multi-Beam Random Access Preamble Scheme for Faster 5G Connection
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Solution Overview
Problem
The increase in the number of beams in 5G cellular communication systems leads to an increased time period for a terminal apparatus to connect to a network due to the non-overlapping radio resources assigned to each beam, resulting in inefficiency.
Innovation Solution
Implementing a common sequence of random access preambles that can be used across multiple beams, allowing the terminal apparatus to transmit the preamble using any of the radio resources corresponding to those beams, thereby increasing the opportunities for connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of beams is increased to expand area coverage, then the coverage area is improved, but the time period for radio resource arrival and connection establishment is increased
Solution Approach 1:
The patent applies universality by enabling a single random access preamble sequence to be used across multiple beams instead of assigning dedicated sequences to each beam. The terminal apparatus can transmit the same preamble on any beam's radio resources, making the preamble sequence universal across multiple beams. This reduces the time to establish connection while maintaining expanded coverage area, as the terminal doesn't need to wait for beam-specific resources but can use any available beam's resources.
2Area of stationary object
If the number of beams is increased to provide area coverage, then the coverage area is improved, but the time period for arrival of radio resources for transmitting random access preamble is increased
Solution Approach 1:
The patent makes radio resources universal by allowing the same random access preamble to be transmitted on radio resources associated with any beam. Instead of having terminal apparatus wait for beam-specific resources in sequence, the terminal can use any beam's radio resources immediately, effectively reducing the duration of the radio resource arrival time period while maintaining the expanded coverage provided by multiple beams.
3Strength
If beamforming is used with multiple beams to expand high-frequency coverage, then the signal gain is improved, but the connection establishment time is increased
Solution Approach 1:
The patent applies universality by allowing the terminal apparatus to transmit random access preambles using radio resources from any beam in the beamformed system. This maintains the signal gain benefits of beamforming while reducing connection establishment time, as the terminal can immediately use any available beam's resources rather than waiting for specific beam resources or performing sequential beam sweeping.
Data Source
AI summary
A base station apparatus that forms a plurality of beams notifies a terminal apparatus of information indicating radio resources to be used in transmission of a random access preamble by the terminal apparatus for each of the plurality of beams and information of a predetermined sequence of a random access preamble allowed for transmission using any of the radio resources of the plurality of beams, and establishes, in a case where a random access preamble generated using the predetermined sequence is detected using the radio resource corresponding to one beam included in the plurality of beams, a connection with the terminal apparatus that transmitted the random access preamble.