Base Station Resource Reservation for 5G Random Access
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Solution Overview
Problem
The 5G communication system faces challenges in supporting efficient random access procedures, especially in idle mode, and achieving forward compatibility for future services, particularly in high-frequency bands above 6 GHz, where directional beam-based transmission is necessary but difficult due to lack of status information for UEs attempting initial access.
Innovation Solution
A method where a base station transmits information on reserved resources to a terminal, determining whether to map signals based on overlapped resources, and the terminal receives signals on non-overlapped resources, enabling effective beam-based random access and resource allocation for dynamic TDD operations, supporting 5G-oriented communication services and channel estimation in both high and low frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If directional beam-based transmission is used in high-frequency bands above 6 GHz, then data rates are improved, but random access procedures become difficult due to lack of status information for UEs attempting initial access
Solution Approach 1:
The base station performs preliminary beam sweeping to identify suitable beams for idle mode UEs before random access procedures. The BS transmits synchronization signals and system information using multiple directional beams in different time slots, allowing UEs to detect and select an appropriate beam without requiring prior status information about the UE
Solution Approach 2:
The random access procedure is segmented into multiple steps with dedicated beam management functions. The procedure includes beam detection phase where UEs identify suitable beams, beam selection phase where UEs choose from detected beams, and random access phase where UEs complete access using selected beams. This segmentation allows directional beam-based transmission to support random access in high-frequency bands
2Productivity
If reserved resources are allocated for specific purposes, then resource allocation efficiency is improved, but resource overlap occurs when signals need to be transmitted on the same resources
Solution Approach 1:
The base station dynamically determines whether to map signals to reserved resources based on current transmission needs. When a signal needs to be transmitted and resources overlap with reserved resources, the base station evaluates whether to apply rate matching (adjusting the signal to fit around reserved resources) or puncturing (transmitting the signal and overwriting reserved resources). This dynamic decision-making maintains both resource allocation efficiency and signal transmission reliability
Solution Approach 2:
The system changes transmission parameters such as modulation and coding scheme (MCS) when rate matching is applied to accommodate reserved resources. By adjusting these parameters, the base station can maintain reliable signal transmission while respecting reserved resource allocations, thus resolving the conflict between resource efficiency and transmission reliability
3Reliability
If resources are reserved for specific functions, then service quality is improved, but frequency utilization efficiency decreases due to dedicated resource allocation
Solution Approach 1:
Reserved resources are designed to serve multiple functions. For example, certain time-frequency resources are reserved for both synchronization signal transmission and random access preamble reception. This multi-functionality allows the system to maintain high service quality for critical functions while improving overall frequency utilization efficiency by reducing the total amount of dedicated resources needed
Data Source
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AI summary
Disclosed are a communication method for merging, with an IoT technology, a 5G communication system for supporting a data transmission rate higher than that of a 4G system, and a system therefor. The present disclosure can be applied to an intelligent service (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety-related services, and the like) on the basis of a 5G communication technology and an IoT-related technology. Disclosed are a method and an apparatus for supporting a reservation resource, and according to the present invention, a method for a base station in a communication system comprises a step of transmitting reservation resource-related information to a terminal, determining, on the basis of the reservation-related information, whether a first signal is mapped to the reservation resource and a resource, in which the first signal to be transmitted to the terminal is overlapped, and transmitting the first signal to the terminal on the basis of the determination.