Contention-Based PUSCH Scheduling Request Acknowledgement
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently acknowledging scheduling request (SR) transmissions on contention-based physical uplink shared channels (PUSCH), particularly in scenarios where uplink grants are not immediately available, leading to delays and inefficiencies in resource allocation.
Innovation Solution
The described techniques enable User Equipment (UE) to transmit SRs on contention-based PUSCH without an uplink grant, allowing for faster access and enabling network access devices to determine availability of uplink resources, responding with either an uplink grant when resources are available or an acknowledgement when they are not, thereby optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If UEs transmit SR on contention-based PUSCH without uplink grant, then access speed is improved, but resource collision and interference increase
Solution Approach 1:
The network access device transmits an indication of available contention-based PUSCH resources to UEs in advance. UEs use these pre-configured resources for SR transmission without requiring real-time uplink grants, enabling faster access while avoiding collisions through predetermined resource allocation.
Solution Approach 2:
The indication message acts as an intermediary between the network access device and UEs, conveying resource availability information. This intermediary mechanism allows UEs to select appropriate resources for SR transmission, reducing interference while maintaining fast access capability.
2Productivity
If network access devices monitor and respond to each SR transmission, then resource allocation efficiency is improved, but system complexity increases
Solution Approach 1:
The network access device determines resource availability locally at each cell and transmits this information to UEs. This localized approach allows efficient resource allocation without requiring complex centralized coordination, reducing system complexity while maintaining allocation efficiency.
Solution Approach 2:
UEs autonomously select contention-based PUSCH resources based on the indication received from the network access device, without requiring detailed scheduling commands for each SR transmission. This self-service mechanism reduces the signaling overhead and system complexity while maintaining efficient resource allocation.
3Loss of time
If uplink resources are allocated immediately upon SR transmission, then latency is reduced, but resource waste increases when resources are not available
Solution Approach 1:
The network access device prepares and transmits indication information about available contention-based PUSCH resources in advance. This preliminary action allows UEs to immediately use pre-approved resources for SR transmission, reducing latency while avoiding resource waste by only allocating resources that are confirmed to be available.
Data Source
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AI summary
A method for wireless communication at a user equipment (UE) includes transmitting a scheduling request (SR) transmission in a radio frequency spectrum band on at least one resource of a contention-based physical uplink shared channel (PUSCH), and monitoring the radio frequency spectrum band for a response to the SR transmission. A method for wireless communication at a network access device includes receiving, from a UE, a SR transmission in a radio frequency spectrum band on at least one resource of a contention-based PUSCH; determining an availability of uplink resources allocable to the UE; selecting, based at least in part on the determined availability of uplink resources, the response to the SR transmission; and transmitting in the radio frequency spectrum band, to the UE, the selected response to the SR transmission. The response to the SR transmission includes an uplink grant or an acknowledgement of the SR transmission.