Uplink Connection Processing via Adaptive Channel Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the EUTRA standard for mobile communication, there is a lack of regulation on the type of channel to be used for uplink connection processing between a mobile station and a base station, leading to inefficiencies in resource utilization and interference issues, particularly due to variations in transmission procedures and synchronization conditions.
Innovation Solution
A connection processing method that adaptively selects between asynchronous and synchronous random access channels, along with a control channel, based on the synchronization and resource allocation conditions of the mobile station, to efficiently utilize communication resources and follow the EUTRA standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a random access channel (RACH) is used before uplink resource allocation, then the mobile station can establish uplink connection, but interference occurs between RACH and data channel due to non-orthogonal transmission
Solution Approach 1:
The patent segments the random access procedure into two distinct phases: Phase 1 uses a non-orthogonal RACH for initial uplink establishment, while Phase 2 transitions to orthogonal RACH or control channel for subsequent access. This segmentation allows the system to benefit from non-orthogonal RACH simplicity in initial connection while avoiding its interference problems in ongoing communication.
Solution Approach 2:
The patent implements dynamic channel selection based on system conditions. The mobile station adaptively chooses between non-orthogonal RACH, orthogonal RACH, and control channel depending on whether uplink resources are allocated and what phase of communication is occurring. This dynamic adaptation resolves the contradiction by selecting the appropriate channel type for each specific operational context.
2Reliability
If power ramping is used to increase transmission power until base station receives data, then connection can be established, but transmission time and energy consumption increase
Solution Approach 1:
The patent applies preliminary action by having the mobile station transmit uplink data or control information immediately in Phase 1 using non-orthogonal RACH, without waiting for base station acknowledgment or performing power ramping. This preliminary transmission establishes the uplink connection faster, and subsequent phases handle resource optimization.
Solution Approach 2:
The patent extracts the power ramping procedure from the initial connection establishment process. Instead of requiring power ramping for every connection attempt, the system uses non-orthogonal RACH for rapid initial access, then transitions to orthogonal RACH or control channel for refined resource management, thereby eliminating unnecessary time delays.
3Object-affected harmful factors
If orthogonal RACH is used in OFDM system, then interference between RACH and data channel is eliminated, but resource allocation complexity and synchronization requirements increase
Solution Approach 1:
The patent segments the communication process into phases with different channel requirements. Phase 1 uses simple non-orthogonal RACH for initial access when complexity should be minimized. Phase 2 uses orthogonal RACH or control channel when the system is already synchronized and resource allocation is established, thereby reducing overall system complexity while maintaining interference-free operation when needed.
4Productivity
If different transmission procedures are used for synchronized and non-synchronized conditions, then connection processing can be optimized, but channel selection complexity increases
Solution Approach 1:
The patent implements a dynamic channel selection mechanism where the mobile station adaptively chooses between non-orthogonal RACH, orthogonal RACH, and control channel based on real-time system conditions including synchronization state and resource allocation status. This dynamic approach optimizes connection processing for each specific condition while providing clear selection criteria that manage complexity.
Solution Approach 2:
The patent establishes preliminary channel selection rules based on synchronization status. Non-synchronized conditions use non-orthogonal RACH with simple procedures, while synchronized conditions use orthogonal RACH or control channel with predefined resource allocation. These preliminary decisions simplify subsequent operations and reduce real-time complexity.
Data Source
AI summary
In a mobile station, correction information is obtained from a base station for correcting a transmission timing shift in an uplink line of the mobile station, and the transmission timing shift is corrected in accordance with the correction information. Within a period in which the correction information is valid, the mobile station requests communication resource allocation information from the base station, using a random access channel having guard time. In an alternate embodiment, if a communication resource for transmitting a control channel in the uplink line is assigned to the mobile station within a period during which the correction information is valid, the mobile station instead requests the communication resource allocation information from the base station using the control channel in an uplink line from the mobile station to the base station.