Random Access Procedure in Wireless Systems
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently performing random access procedures due to limitations in control channel management and interference mitigation, particularly in multi-node environments, which affect data transmission rates and user equipment performance.
Innovation Solution
The proposed method involves transmitting a random access preamble to one or more nodes, receiving a random access response message, and transmitting an uplink signal to a different node, with the random access response message including information for control channel scheduling and interference mitigation techniques, enabling efficient data transmission and contention resolution in a CoMP scheme.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If random access procedure is performed in conventional LTE system, then basic connectivity is established, but data transmission rate is limited and interference mitigation is insufficient in multi-node environments
Solution Approach 1:
The patent segments the random access response handling by separating the serving cell identification function from the uplink transmission function. The UE identifies the serving cell that sent the random access response message, then transmits the uplink signal to a different node based on scheduling information. This segmentation enables coordinated multi-point operations that improve data transmission rates while maintaining reliable interference mitigation through dedicated serving cell management.
Solution Approach 2:
The patent introduces the serving cell as an intermediary that mediates between the UE and the transmission node. The serving cell sends the random access response message to the UE and provides scheduling information for uplink transmission to a different node. This intermediary role enables the UE to establish connectivity while the network coordinates interference mitigation and optimizes data transmission rates through centralized control.
2Adaptability or versatility
If random access preamble is transmitted to one or more nodes, then access flexibility is improved, but control channel management complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific roles to different nodes. The serving cell that receives the random access preamble is responsible for sending the random access response message and providing scheduling information. Other nodes can be involved in uplink transmission based on network coordination. This differentiated role assignment maintains control channel management simplicity at each node while enabling flexible multi-node access operations.
Solution Approach 2:
The patent uses preliminary action by having the serving cell pre-configure and send scheduling information for uplink transmission within the random access response message. This preliminary configuration enables the UE to efficiently manage control channels by knowing in advance which node to transmit to and what resources to use, reducing the complexity of real-time control channel management while maintaining access flexibility.
3Productivity
If uplink signal is transmitted to a different node than the serving cell, then data transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The serving cell acts as an intermediary that provides scheduling information containing the identification and resource allocation for the different node to which the UE should transmit the uplink signal. This intermediary approach allows the UE to efficiently route signals to the appropriate node based on pre-configured information from the serving cell, improving data transmission efficiency while minimizing device complexity through centralized control.
Solution Approach 2:
The serving cell performs preliminary action by including scheduling information in the random access response message that pre-configures the UE with the necessary information to transmit the uplink signal to a different node. This preliminary configuration reduces the computational burden on the UE during actual transmission, improving data transmission efficiency while keeping device complexity manageable through advance preparation.
Data Source
AI summary
Disclosed is a method for a terminal to execute a random access procedure in a wireless communication system. Specifically, the method comprises the steps of: transmitting a random access preamble message to one or more nodes; receiving a random access response message from a serving cell from among the one or more nodes; and transmitting an uplink signal to a different node from among the one or more nodes, wherein the random access response message comprises information for transmitting the uplink signal to the different node.