Simultaneous Access Shared Resources Wireless Network
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Solution Overview
Problem
Current wireless systems typically allow only one user to access the wireless spectrum resource at a time, leading to inefficient bandwidth usage due to excessive signaling for resource allocation and synchronization, especially in network-controlled frame-based protocols.
Innovation Solution
The implementation of a Physical Uplink Shared Simultaneous-access Channel (PUSSCH) enables multiple transmitters to access shared resources simultaneously, using techniques like Multi User Detection (MUD) and Successive Interference Cancellation (SIC) to separate transmissions, reducing the need for initial signaling and maintaining synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only one user accesses the spectrum resource at a time using frame-based protocol architecture, then resource allocation and synchronization are maintained through network control, but bandwidth usage efficiency deteriorates due to excessive signaling messages required for basic operations
Solution Approach 1:
The patent merges multiple user transmissions onto the same time-frequency resource by combining their signals at the receiver. Multiple users share the same spectrum resource simultaneously through signal superposition, eliminating the need for sequential access and reducing signaling overhead for resource allocation.
Solution Approach 2:
The patent creates a universal access mechanism where any number of users can access the shared resource simultaneously without requiring dedicated signaling for each user. The random access channel serves multiple functions: initial access, synchronization, and resource indication, reducing overall signaling requirements.
2Reliability
If network-controlled frame-based protocol is used for wireless communication, then basic operations like packet data transmission and synchronization are maintained, but signaling bandwidth may exceed actual data transmission bandwidth for certain applications
Solution Approach 1:
The patent extracts the essential synchronization and access information from complex signaling messages and embeds it directly in the random access preamble. Users convey resource selection and synchronization information through the physical layer preamble structure itself, eliminating the need for separate higher-layer signaling messages.
Solution Approach 2:
The patent performs resource allocation and synchronization actions in advance through the random access preamble transmission. Users select and indicate their desired resources beforehand through the preamble sequence and timing, allowing the network to prepare for data transmission without requiring extensive real-time signaling.
3Productivity
If multiple transmitters access shared resources simultaneously, then bandwidth usage is optimized and signaling requirements are reduced, but transmission collisions and interference increase
Solution Approach 1:
The patent implements feedback mechanisms where the network detects random access preambles from multiple users, determines successful detections, and provides feedback through downlink messages. This feedback allows users to know whether their transmission was successful and guides subsequent data transmission, reducing collisions through informed retransmission decisions.
Solution Approach 2:
The patent changes the physical parameters of transmission by using different preamble sequences, cyclic shifts, and time offsets for different users. These parameter variations allow the receiver to distinguish between simultaneous transmissions from multiple users through correlation-based detection, managing interference through parameter diversity.
Data Source
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AI summary
In some implementations, a method in a wireless network includes allocating a radio resource to a plurality of transmitters. The radio resource is configured for simultaneously transmitting and receiving user data with varying transmission delays. User data bursts are received, from the plurality of transmitters, with varying transmission delays transmitted over the allocated radio resource with varying resource identities.