Contention-Based Uplink Resource Allocation via DM-RS Shift Signaling
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Solution Overview
Problem
Wireless communication systems face challenges in reducing latency and signaling overhead due to the need for scheduling requests in multiple-access systems, particularly in contention-based uplink transmissions, which can lead to delays and inefficiencies, especially during low system load conditions.
Innovation Solution
A method and apparatus for allocating a common contention-based resource for user equipment (UEs) and signaling transmission parameters, such as demodulation reference signal (DM-RS) shifts, to differentiate uplink transmissions, allowing UEs to transmit without prior scheduling requests, thereby reducing latency and signaling overhead while managing contention-based uplink channels to increase throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If scheduling requests are used for uplink transmissions, then resource allocation is controlled and reliable, but latency and signaling overhead increase
Solution Approach 1:
The patent extracts the scheduling request mechanism from the uplink transmission process, allowing UEs to directly access contention-based resources without going through the traditional scheduling request procedure. This removes the latency-inducing signaling steps while maintaining resource allocation through transmission parameters like DM-RS shifts that enable base station identification of transmitting UEs.
Solution Approach 2:
The patent enables UEs to self-select and transmit on contention-based resources autonomously without requiring base station scheduling grants. Each UE independently determines when to transmit using the allocated contention resources, eliminating the need for scheduling requests and reducing latency while the base station uses transmission parameters to identify and manage the transmitting UEs.
2Reliability
If scheduling requests are used for uplink transmissions, then resource allocation is controlled, but signaling overhead increases
Solution Approach 1:
The patent removes the scheduling request signaling mechanism from the uplink transmission process. Instead of exchanging multiple signaling messages between UE and base station for resource allocation, UEs directly transmit on contention-based resources using pre-configured transmission parameters, eliminating the associated signaling overhead while maintaining controlled resource allocation through parameters like DM-RS shifts.
3Productivity
If common contention-based resources are shared by multiple UEs, then resource utilization efficiency improves, but difficulty in identifying transmitting UE increases
Solution Approach 1:
The patent applies local quality by assigning unique transmission parameters, specifically DM-RS shifts, to different UEs using the same contention-based resources. This allows each UE's signal to have distinctive local characteristics (different DM-RS sequences) while sharing the common resource, enabling the base station to easily identify which UE is transmitting without reducing resource utilization efficiency.
Data Source
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AI summary
Certain aspects of the present disclosure relate to a technique for managing contention-based uplink data transmissions. According to certain aspects, a base station may allocate a common contention-based resource to a plurality of user equipment (UEs). The plurality of UEs may utilize the contention-based resource to transmit uplink data without prior scheduling, which may result in transmission collisions. Certain aspects of the present disclosure provide a mechanism for determining which UE sent an uplink transmissions based on one or more transmission parameter signaled to the UEs.