Collision Detection in E-DCH Random Access Procedure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increased likelihood of collisions during the Enhanced Dedicated Channel (E-DCH) random access procedure in wireless communication systems, due to longer message lengths and higher data rates, leads to packet loss without an effective collision detection mechanism.
Innovation Solution
A method and apparatus for collision detection in the random access procedure, where a communication device transmits data on an uplink channel with selected random access parameters and interrupts the transmission if no permission signal is received from the network element within a predetermined time interval, using modules for scheduling and signal generation to manage the data transmission and detect collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the message length and data rate are increased in the E-DCH random access procedure, then the communication efficiency and data transfer capability are improved, but the likelihood of collision increases leading to packet loss
Solution Approach 1:
The patent applies preliminary action by implementing collision detection before the random access procedure completes. The system monitors the uplink channel during the message transmission phase and detects collisions early by checking for unexpected energy or signal patterns, allowing the system to abort the transmission before packet loss occurs.
Solution Approach 2:
The patent implements feedback by continuously monitoring the uplink channel during random access message transmission and providing real-time collision detection information back to the transmitting device. This feedback mechanism enables dynamic adjustment of transmission parameters or abort decisions based on detected collision conditions.
2Reliability
If a collision detection mechanism is implemented, then packet loss is reduced and transmission reliability is improved, but the system complexity increases
Solution Approach 1:
The patent applies self-service by enabling the random access procedure itself to provide collision detection functionality. The existing uplink channel monitoring and signal processing capabilities are leveraged to detect collisions, rather than introducing entirely separate detection infrastructure. The system uses its own transmission signals and channel knowledge to identify collision conditions.
Solution Approach 2:
The patent uses an intermediary approach by introducing a collision detection function that operates on the existing uplink channel signals. Rather than directly modifying the random access protocol, the patent inserts a monitoring layer that processes the same physical signals already present in the system, detecting collisions through energy measurement and signal pattern analysis.
Data Source
AI summary
A method, an apparatus and a communication system for collision detection for a random access procedure for an uplink data channel. In one embodiment, the apparatus includes a module configured to transmit a data transmission on the uplink data channel, and an uplink scheduling and signal generating module configured to select random access parameters for a random access procedure and schedule the data transmission using the random access parameters for the random access procedure. The uplink scheduling and signal generating module is also configured to interrupt the data transmission after a predetermined time interval if the apparatus does not receive a permission signal from a network element during the predetermined time interval.