Base Station Beam Coordination with Shared Random-Access Resources
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Solution Overview
Problem
The prolonged time period for a terminal apparatus to connect to a network due to the increased number of beams in 5G cellular communication, which prolongs the cycle of arrival of radio resources for random-access channel transmission.
Innovation Solution
Assigning a shared radio resource for multiple beams with different sequences for generating random-access preambles, allowing the base station to specify the beam of transmission and establish connection efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of beams is increased to expand planar coverage, then the coverage area is improved, but the time period until terminal apparatus connects to the network is prolonged
Solution Approach 1:
Multiple beams share the same radio resource for random-access preamble transmission. Instead of allocating separate radio resources to each beam, the patent combines the resource usage across multiple beams, allowing terminals to connect faster while maintaining coverage across all beams.
Solution Approach 2:
The patent changes the parameter of random-access preamble by introducing beam-specific sequences that can be transmitted on shared radio resources. This allows the system to distinguish which beam a terminal selected even when multiple beams share the same time-frequency resource, thereby reducing connection time without losing beam identification capability.
2Area of stationary object
If the number of beams is increased to provide planar coverage, then the coverage area is improved, but the cycle of arrival of radio resource for random-access channel transmission is prolonged
Solution Approach 1:
The patent merges the radio resource allocation across multiple beams by allowing shared usage of the same time-frequency resources for random-access preamble transmission. This consolidation reduces the radio resource cycle duration while maintaining the ability to support multiple beams for expanded coverage.
Solution Approach 2:
The shared radio resource serves multiple beams simultaneously, making the resource universal across different beam directions. This multi-functionality allows a single radio resource to fulfill the random-access function for multiple beams, thereby shortening the resource cycle while supporting expanded coverage.
3Measurement precision
If separate radio resources are allocated to each beam, then beam identification is accurate, but the connection establishment time is prolonged
Solution Approach 1:
The patent changes the identification parameter from separate radio resource allocation to beam-specific sequence identification within shared radio resources. Terminals transmit preambles with sequences that indicate the selected beam, allowing accurate beam identification while using shared resources to reduce connection time.
Solution Approach 2:
The beam-specific sequence acts as an intermediary that carries beam identification information within the shared radio resource. Instead of requiring separate resources for identification, the sequence serves as a mediator that enables both shared resource usage and accurate beam identification simultaneously.
Data Source
AI summary
A base station apparatus that forms a plurality of beams notifies a terminal apparatus of setting information with respect to each of the plurality of beams, the setting information indicating a combination of a radio resource to be used by the terminal apparatus in transmission of a random-access preamble and a sequence of a random-access preamble to be transmitted in the radio resource, specifies, in a case where a random-access preamble has been detected in a radio resource corresponding to two or more beams among the plurality of beams, a beam corresponding to a sequence of the detected random-access preamble from among the two or more beams, and establishes connection with the terminal apparatus that has transmitted a detected random-access preamble.