Contention-Based Access Control for Mobile Uplink Transmission
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Solution Overview
Problem
In mobile communication systems, contention-based uplink transmission resources face inefficiencies and reliability issues due to collisions during data transmission, particularly in LTE systems where dedicated resource allocation leads to increased transmission delay and low reliability.
Innovation Solution
A method and apparatus for a terminal in a mobile communication system that detects allowed contention-based access, receives a contention-based uplink grant, and transmits data only on logical channels permitted for contention-based access, avoiding collisions by terminating transmissions when they collide with Random Access Preamble or message 3 transmissions, and prioritizing data transmission based on channel conditions and resource availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated resource allocation is used for uplink transmission, then transmission reliability is improved, but transmission delay increases due to resource allocation requests
Solution Approach 1:
The uplink transmission resources are segmented into two distinct types: dedicated resources for high-reliability transmissions and contention-based resources for low-delay transmissions. This segmentation allows the system to select the appropriate resource type based on the specific transmission requirements, thereby resolving the contradiction between reliability and delay
Solution Approach 2:
The system dynamically selects between dedicated and contention-based resources based on real-time conditions such as buffer status, channel quality, and QoS requirements. This dynamic resource selection enables the system to adapt to changing transmission needs and optimize the trade-off between reliability and delay
2Loss of time
If contention-based access is allowed for all data types, then transmission delay is reduced, but transmission reliability deteriorates due to collisions
Solution Approach 1:
Different QoS parameters and reliability requirements are assigned to different logical channels. The system applies local quality control by allowing contention-based access only for logical channels with specific QoS characteristics (e.g., low priority, tolerance for retransmission), while dedicated resources are allocated to channels requiring high reliability
Solution Approach 2:
The system changes the access mode parameter based on logical channel identification. When a terminal has data on a logical channel that permits contention-based access, it uses contention resources; otherwise, it uses dedicated resources. This parameter change resolves the contradiction by making the access mode adaptive to the data type
3Reliability
If contention-based transmission is restricted to specific logical channels, then transmission reliability is improved for critical data, but device complexity increases due to access control mechanisms
Solution Approach 1:
The network pre-configures each logical channel with QoS parameters and access permissions before data transmission begins. The terminal stores this configuration information and uses it to automatically determine the appropriate access mode without real-time network intervention, thereby improving reliability for critical data while minimizing access control complexity
Solution Approach 2:
The terminal autonomously determines whether to use contention-based or dedicated resources based on the logical channel configuration and current transmission requirements. This self-service mechanism eliminates the need for complex real-time access control signaling, reducing device complexity while maintaining reliability through pre-configured QoS parameters
Data Source
AI summary
The present invention relates to a method and apparatus in which a terminal performs contention-based access in a mobile communication system, wherein the method comprises: a sensing step of sensing whether or not contention-based access is allowed for at least one logical channel; a receiving step of receiving a contention-based reverse grant from a base station; and a transmitting step of transmitting data to the base station through the logical channel for which the contention-based access is allowed. According to the present invention, contention-based access can be efficiently performed, and the reliability of transmission can be ensured.