RRC Idle Mode Single Transmission Preamble for LTE Network Efficiency
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Solution Overview
Problem
In LTE systems, UEs in RRC-idle mode can only send RRC messages by performing a contention-based random access procedure, which requires establishing an RRC connection, consuming many resources and reducing network efficiency.
Innovation Solution
The method involves providing single transmission preambles for UEs in RRC-idle mode to send RRC messages without establishing an RRC connection, using preamble groups C and D for uni-directional communication, allowing UEs to transmit RRC messages using a single transmission preamble and receiving a random access response from the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs in RRC-idle mode perform contention-based random access procedure to send RRC messages, then the messages can be transmitted reliably, but network resources are consumed excessively and efficiency is reduced
Solution Approach 1:
The patent segments the random access procedure into two distinct types: contention-based random access for multi-message scenarios and contention-free random access for single-message scenarios. This segmentation allows the system to select the appropriate access mode based on the specific transmission needs, avoiding unnecessary resource consumption while maintaining reliability.
Solution Approach 2:
The patent introduces a new parameter dimension by defining different random access types (contention-based vs. contention-free) with distinct resource allocation mechanisms. By changing the access mode parameter, the system can optimize between reliability and efficiency depending on the transmission scenario.
2Reliability
If UEs establish full RRC connection to send RRC messages in RRC-idle mode, then message transmission is ensured, but the complexity and resource overhead increase significantly
Solution Approach 1:
The patent extracts the essential function of RRC message transmission from the complete RRC connection establishment process. By allowing UEs to send RRC messages directly in RRC-idle mode through contention-free random access, the solution removes the unnecessary connection establishment steps while preserving the core messaging capability.
Solution Approach 2:
The patent prepares dedicated random access resources (specific preambles) in advance for UEs that need to send single RRC messages. This preliminary configuration of dedicated preambles allows UEs to immediately transmit messages without going through the complex connection establishment procedure.
3Ease of operation
If contention-based random access procedure is used for single RRC message transmission, then connection establishment is complete, but resource consumption and transmission time increase
Solution Approach 1:
The patent applies partial action by implementing a simplified random access procedure that performs only the necessary steps for single message transmission. Instead of completing the full connection establishment sequence, the contention-free approach executes just the essential preamble transmission and message sending steps, reducing time loss while maintaining operational effectiveness.
Data Source
AI summary
In a wireless communication system, different preambles are provided for transmitting RRC messages in the RRC-connected mode and in the RRC-idle mode. When a user equipment operating in the RRC-idle mode is required to transmit a single RRC message, the single-transmission preamble is used for transmitting the single RRC message without establishing an RRC connection.