Multiplexing UGS Users via Orthogonal Patterns
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Solution Overview
Problem
Current radio resource management in packet-based communications systems, particularly for unsolicited grant service (UGS), is inefficient for stochastic-type traffic as it wastes resources due to constant request and grant messages, even during silence periods, and introduces complexity in handling multi-user packets and error tolerance.
Innovation Solution
Implementing stochastic multiplexing of users onto unsolicited grant service-based resources, where multiple users share the same radio resources using user-specific patterns, reducing the need for explicit requests and minimizing overhead, especially suitable for delay-sensitive, low-rate, and error-tolerant traffic like voice communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple users are allocated separate dedicated radio resources for UGS, then each user gets guaranteed quality of service, but radio resource utilization efficiency deteriorates due to wasted resources during silence periods
Solution Approach 1:
Multiple UGS users are merged onto the same radio resource (UGS slot) and multiplexed using user-specific orthogonal patterns (e.g., orthogonal codes, frequency patterns, or time patterns). This combining allows the system to serve multiple users simultaneously on shared resources while maintaining their individual QoS requirements through the orthogonality of their patterns.
Solution Approach 2:
The same UGS radio resource (time slot, frequency resources) is made universal to serve multiple different users at different times or through different orthogonal patterns. The resource transitions from being dedicated to a single user to being multi-functional, accommodating multiple users dynamically based on their activity patterns.
2Loss of energy
If multiple users share the same radio resource for UGS, then radio resource utilization improves, but interference management and error control complexity increases
Solution Approach 1:
The shared radio resource is segmented into multiple orthogonal channels or patterns, each assigned to a specific user. Users transmit on the same physical resource but with different orthogonal signatures (codes, frequencies, or time patterns), which segments the interference space and allows the receiver to separate user signals through correlation or filtering operations.
Solution Approach 2:
The system changes the transmission parameters (orthogonal codes, frequency offsets, or time patterns) for each user to ensure orthogonality. By varying these parameters systematically, the system manages interference through parameter differentiation rather than physical resource separation, reducing overall system complexity.
3Measurement precision
If explicit request and grant messages are used for resource allocation, then resource allocation accuracy improves, but signaling overhead increases for stochastic traffic
Solution Approach 1:
Radio resources for UGS users are pre-allocated and configured in advance without requiring explicit request-grant exchanges for each transmission. The scheduler configures users with their specific orthogonal patterns and resource assignments beforehand, allowing them to transmit immediately when data arrives, eliminating the need for continuous signaling.
Solution Approach 2:
UGS users autonomously transmit their data using pre-configured resources and patterns without needing to request resources or receive grants for each transmission. The system enables self-service transmission where users independently utilize their allocated orthogonal patterns, significantly reducing signaling overhead for stochastic traffic patterns.
Data Source
AI summary
The technology in this application multiplexes transmission associated with multiple users onto the same unsolicited grant service (UGS) radio resource(s) in a packet-based, radio communications system. Normally, the radio resources in a packet-based communications system are dynamically scheduled in response to radio resource requests associated with specific user devices, and the scheduled communications are designed not to use the same radio resource at the same time. However, an unsolicited grant of radio resources for communication between multiple user devices and the packet-based communications system is also established. The communications between those multiple user devices and the packet-based communications system use at least some of the same radio resources associated with the unsolicited grant at the same time. Because of this at least partial radio resource overlap/collision, each of the multiple user's data to be transmitted via the UGS is associated with a user-specific radio resource pattern. A user's radio resource pattern permits a radio receiver to extract that user's data from the received UGS signal that include multiple user transmissions.