Spread Spectrum Scheduling Requests for Wireless Resource Allocation
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in spectral resource allocation for uplink transmissions, particularly in grant-based approaches, which lead to increased latency and underutilization of scarce spectral resources due to the need for scheduling requests, and existing methods preallocate resources even when UEs do not have data to transmit.
Innovation Solution
Implementing a system where the base station communicates with UEs without preallocating spectral resources for scheduling requests, using spread spectrum signals based on spreading sequences to detect and grant resources only when needed, allowing UEs to send scheduling requests as spread spectrum signals that indicate their identity without additional information, thereby reducing latency and improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If grant-based uplink transmissions are used where the base station grants spectral resources on an as-needed basis, then spectral resource allocation efficiency is improved, but latency increases due to the time associated with requesting and allocating resources
Solution Approach 1:
The base station pre-configures multiple contention resolution identities (CRIs) and their corresponding spreading sequences before the contention-based random access procedure. This preliminary preparation allows the UE to immediately transmit its CRI using the appropriate spreading sequence when data needs to be sent, eliminating the latency associated with real-time resource allocation while maintaining efficient spectral utilization.
2Loss of time
If grant-free or configured grant uplink transmissions are used where the base station preallocates uplink resources to UEs, then latency is reduced, but spectral resources are under-utilized when UEs don't have data to transmit
Solution Approach 1:
The system enables UEs to autonomously select and transmit their CRI using the appropriate spreading sequence from the pre-configured set without requiring base station scheduling or resource allocation. This self-service mechanism allows UEs to immediately access uplink resources when needed (reducing latency) while the base station only processes actual transmissions (improving spectral utilization by avoiding allocation to idle UEs).
3Productivity
If spectral resources are allocated for scheduling requests in grant-based approaches, then resource allocation can be efficient, but the spectral resources may be under-utilized when UEs do not have data to transmit
Solution Approach 1:
The invention extracts the scheduling request functionality from traditional grant-based approaches by using contention-based random access with CRI transmission. Instead of allocating dedicated spectral resources for SRs that may go unused, the system allows UEs to transmit CRIs using spreading sequences in a contention-based manner, thereby eliminating wasted spectral resources while maintaining efficient allocation for actual data transmissions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables low-latency, high-reliability communication by allowing UEs to request resources only when needed, reducing the inefficiencies associated with preallocation and increasing the utilization of spectral resources, while meeting the latency and reliability standards for URLLC applications.
Implementation Method 1
a scheduling request may include a spread spectrum signal based on a spreading sequence
Data Source
AI summary
Apparatuses, systems and methods are disclosed for wireless communication. A base station may communicate with a plurality of user equipments (UEs) without allocating spectral resources to the UEs for communicating scheduling requests. The base station may detect a scheduling request from a requesting UE of the plurality of UEs. The scheduling request may include a spread spectrum signal based on a spreading sequence. The scheduling request may indicate an identity for a requesting UE without indicating information other than the identity. The base station may grant spectral resources to the requesting UE in response to detecting a scheduling request.