Shared Scheduling Request Resource for LTE User Identification
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Solution Overview
Problem
Current scheduling request approaches in LTE wireless communication systems face challenges with high access latency and inefficient resource utilization, particularly as the connected-mode user population increases, leading to excessive resource reservation and degraded SR latency performance.
Innovation Solution
Implementing a method where a common or shared scheduling request resource is assigned to multiple users, allowing them to send user IDs using existing PUCCH formats like PUCCH format 2 or 3, which increases resource efficiency and reduces latency by enabling explicit user ID communication during initial SR messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated scheduling request resources are assigned to each user, then user identification is implicit and reliable, but resource utilization becomes inefficient and access latency increases as user population grows
Solution Approach 1:
Multiple users are assigned to share the same scheduling request resource (time-frequency-code combination) instead of each user having a dedicated resource. This merging of resources allows efficient utilization while maintaining user identification through explicit signaling in the SR message format.
Solution Approach 2:
An explicit user ID field is introduced as an intermediary element within the scheduling request message format. This intermediary carries user identification information directly in the SR message, replacing the implicit identification method that relied on dedicated resources, thereby enabling resource sharing while maintaining reliable user identification.
2Ease of operation
If dedicated scheduling request resources are assigned to each user, then user identification is implicit, but access latency increases due to excessive resource reservation
Solution Approach 1:
Multiple users share the same scheduling request resource, reducing the total number of reserved resources and eliminating waste from unused dedicated allocations. This directly reduces access latency by freeing up resources for faster scheduling decisions.
Solution Approach 2:
The explicit user ID field acts as a mediator that enables efficient resource sharing while maintaining clear user identification. Users can quickly access shared resources without the overhead of dedicated resource management, reducing latency while preserving identification capability.
3Productivity
If common scheduling request resources are shared by multiple users, then resource utilization efficiency improves, but explicit user ID communication capability is required
Solution Approach 1:
An explicit user ID field is embedded in the SR message format as an intermediary element. This addition enables multiple users to share resources while maintaining clear identification, with the user ID field serving as the necessary complexity addition that enables resource sharing.
Solution Approach 2:
The enhanced SR message format with explicit user ID field serves multiple functions: it identifies users, requests scheduling, and enables resource sharing. This multi-functional design allows the same signal format to handle resource-efficient multi-user access without requiring separate mechanisms.
Data Source
AI summary
In some implementations, a method implemented in an eNodeB base station (eNB) for a single carrier frequency division multiple access SC-FDMA wireless system includes receiving an uplink control channel signal on an assigned scheduling request resource. A user ID is decoded from the received uplink control channel signal. A message assigning a portion of a resource of the wireless system to a UE associated with the decoded user ID is transmitted.