Random Access Channel Transmission Format Adaptation
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Solution Overview
Problem
Conventional orthogonal code transmission schemes in random access channels of mobile communication systems experience time delays and radio resource wastage due to additional resource allocation processes, leading to inefficiencies in data transmission.
Innovation Solution
A method is introduced to dynamically adjust the transmission format of messages in a random access channel based on measured system load levels, allowing for efficient bandwidth allocation and reduced time delays by selecting appropriate transmission modes and formats according to the load conditions, thereby optimizing channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If orthogonal code transmission scheme is used in random access channel, then data reception probability in base station is improved, but additional resource allocation process causes time delay and radio resource wastage
Solution Approach 1:
The patent combines the data transmission and resource allocation processes into a single step by allowing mobile terminals to directly transmit data through the random access channel without separate resource allocation procedures. This merging eliminates the time delay caused by sequential operations while maintaining the reliability benefits of orthogonal code transmission.
Solution Approach 2:
The patent implements preliminary resource allocation by pre-configuring multiple transmission formats with different payload sizes and coding rates. The base station prepares response messages in advance for various possible data transmissions, enabling immediate acknowledgment without additional resource allocation delays.
2Reliability
If orthogonal code transmission scheme is used in random access channel, then data reception probability in base station is improved, but additional resource allocation process causes radio resource wastage
Solution Approach 1:
The patent introduces dynamic transmission format selection where the mobile terminal chooses among multiple pre-configured formats based on the actual data size and channel conditions. This dynamic adaptation eliminates the need for fixed resource allocation, reducing radio resource wastage while maintaining the reliability advantages of orthogonal code transmission through adaptive coding and modulation.
Solution Approach 2:
The patent changes key transmission parameters including payload size, coding rate, and modulation scheme based on actual data requirements. By adjusting these parameters dynamically rather than using fixed resource allocation, the system achieves both high data reception probability and efficient radio resource utilization without waste.
3Ease of manufacture
If fixed transmission format is used in random access channel, then implementation is simplified, but channel usage efficiency is reduced
Solution Approach 1:
The patent implements a dynamic transmission format selection mechanism where mobile terminals choose among multiple pre-configured formats based on actual data size and channel conditions. This dynamic approach significantly improves channel usage efficiency by matching transmission parameters to actual needs, while the base station maintains implementation simplicity through pre-configured format templates that require no complex real-time processing.
Data Source
AI summary
A random access channel operating method in a mobile communication system is provided. The random access channel operating method includes: (a) selecting a transmission mode according to a load of random access channel and performing transmission to a mobile terminal; (b) receiving a message having a format corresponding to the selected transmission mode from the mobile terminal; (c) determining whether or not a preamble or data is included in the message received in (b) receiving of the message; and (d) if the data is determined to be included in the (c) determining, transmitting a response message for data reception to the mobile terminal. Accordingly, use efficiency of a random access channel can be increased by measuring a system load of the random access channel in a base station and changing a transmission format of a burst transmitted through the random access channel according to the measured load level.