Scheduling Request Transmission via Semi-Persistent Scheduling Resources
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in 3GPP LTE, the existing method for transmitting scheduling requests incurs significant latency due to the need for connection setup before data transmission, which is inefficient for large data transfers and increases signaling overhead, especially in scenarios requiring low latency and high reliability.
Innovation Solution
The proposed method allocates scheduling request resources within semi-persistent scheduling (SPS) resources for uplink data transmission, allowing the UE to transmit scheduling requests using SPS resources, which reduces the need for dedicated scheduling request resources and enables cyclic shifting and dynamic allocation, thereby minimizing latency and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection setup (RRC connection and data connection) is performed before data transmission in idle state, then reliable communication is established, but transmission latency increases significantly
Solution Approach 1:
The base station pre-allocates uplink resources (PUCCH and PUSCH) to the UE in idle state before data transmission occurs. This preliminary resource allocation eliminates the need for connection setup procedures when data needs to be transmitted, reducing latency while maintaining reliability through pre-established resource availability.
2Reliability
If dedicated scheduling request resources are allocated separately from data resources, then scheduling requests can be transmitted reliably, but resource overhead and system complexity increase
Solution Approach 1:
The patent merges scheduling request resources with uplink data resources by allowing UEs to transmit scheduling requests on pre-allocated PUSCH resources alongside data transmissions. This integration eliminates the need for separate dedicated scheduling request resource management, reducing overhead and simplifying the resource allocation system while maintaining reliable scheduling request transmission.
3Loss of time
If scheduling request resources are allocated at frequent intervals, then scheduling request latency is reduced, but resource consumption increases
Solution Approach 1:
The base station allocates uplink resources periodically to UEs in idle state, creating predictable transmission opportunities. This periodic allocation allows UEs to transmit scheduling requests at regular intervals without requiring continuous resource availability, reducing scheduling request latency while optimizing resource consumption through efficient periodic rather than continuous allocation.
Data Source
AI summary
Provided are a method and an apparatus for transmitting a scheduling request in a wireless communication system. Particularly, a terminal receives, from a base station, allocation information for an SR resource and allocation information for an SPS resource. The terminal transmits a scheduling request through the SR resource or the SPS resource. The allocation information for the SR resource indicates that the SR resource is allocated to a first period. The allocation information for the SPS resource indicates that the SPS resource is allocated to a second period. When the scheduling request is transmitted through the SPS resource, the scheduling request is not transmitted through a predetermined plurality of subframes including the SPS resource.