Random Access Procedure Synchronization and Resource Allocation
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Solution Overview
Problem
Current random access procedures in wireless networks are inefficient, leading to resource wastage and performance degradation due to misaligned uplink transmission parameters, dimension-limited user capacity, and increased inter-user interference, especially during initial connections or handovers.
Innovation Solution
A method for performing a random access procedure that involves transmitting a synchronization request, receiving and adjusting transmission parameters, and initiating a synchronization timer to ensure accurate symbol alignment and resource allocation, allowing for efficient resource usage and reduced interference by separating synchronization and resource admission aspects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a straightforward orthogonal resource allocation scheme is used for random access, then resource reservation is simple, but resources are wasted when terminals do not use reserved channels to full extent and the scheme is dimension-limited
Solution Approach 1:
The patent implements dynamic resource allocation where the base station assigns time slots and frequency bands on demand rather than reserving them in advance. The base station sends allocation information to the terminal before data transmission, allowing flexible and efficient use of radio resources without waste from pre-reserved but unused channels.
Solution Approach 2:
The patent changes the resource allocation parameters from static reservations to dynamic assignments. The base station determines and communicates specific time slots and frequency bands for each terminal's data transmission, optimizing resource utilization based on actual transmission needs rather than fixed pre-allocated resources.
2Reliability
If reserved resources are allocated for random access, then terminal identification and access control are enabled, but resources are blocked for other terminals and synchronization accuracy is compromised
Solution Approach 1:
The patent segments the random access procedure into distinct phases: first, the terminal transmits a random access signal to obtain temporary identification and synchronization information; second, the base station sends allocation information for data transmission. This separation allows reliable terminal identification without blocking resources or compromising synchronization accuracy.
Solution Approach 2:
The patent introduces synchronization information as an intermediary element. The base station provides this information to the terminal during the random access phase, enabling accurate synchronization and proper resource utilization in subsequent data transmission phases without requiring reserved resources that would block other terminals.
3Adaptability or versatility
If non-orthogonal resources are used for uplink transmission, then dimension-limitation is removed and more users can connect, but inter-user interference increases and fast power control is required
Solution Approach 1:
The patent dynamically assigns orthogonal time slots and frequency bands to different terminals based on actual transmission needs. The base station sends allocation information to each terminal, enabling multiple users to connect simultaneously without fixed reservations, thus increasing user capacity while managing interference through dynamic resource sharing rather than static non-orthogonal access.
Data Source
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AI summary
The invention relates to a technique for performing a random access procedure over a radio interface (106), for example between a mobile terminal (102) and a radio base station (104) of a mobile network (108). A method aspect of the invention comprises the steps of transmitting a synchronization request (112) for synchronization information; receiving synchronization information (114) in response to the synchronization request; and transmitting, based on at least one transmission parameter adjusted in accordance with the synchronization information, a resource request (116) for data transmission resources.