Shared Scheduling Request Resources in LTE Uplink Control
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Solution Overview
Problem
Current LTE systems face challenges in managing scheduling requests due to increased connected-mode user populations, leading to high access latency and inefficient use of uplink resources, as existing methods struggle to scale effectively with the growing number of users.
Innovation Solution
Implementing a method where a common or shared scheduling request resource is assigned to multiple users, allowing them to transmit scheduling requests using existing PUCCH formats, which increases resource efficiency and reduces latency by enabling orthogonal multiple access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated scheduling request resources are assigned to each user in LTE systems, then each user can transmit scheduling requests reliably, but resource utilization becomes inefficient and access latency increases when the number of connected users grows
Solution Approach 1:
The patent merges multiple users' scheduling request transmissions into a shared uplink resource pool. Instead of dedicating separate resources to each user, multiple users share common PUCCH resources, allowing the system to serve more users with the same resource capacity while maintaining reliable scheduling request transmission through orthogonal code separation.
Solution Approach 2:
The patent makes uplink control resources universal by designing a shared scheduling request resource pool that can be accessed by multiple users. The same PUCCH resources serve multiple users simultaneously through code division multiplexing, increasing resource utilization efficiency while maintaining system reliability.
2Reliability
If dedicated scheduling request resources are assigned to each user, then scheduling requests can be transmitted without contention, but access latency increases due to resource scarcity when user population grows
Solution Approach 1:
The patent combines multiple users' scheduling request opportunities into shared time-frequency resources with orthogonal code separation. This merging approach increases the total capacity for scheduling requests within the same time window, reducing access latency while maintaining reliable transmission through code orthogonality.
Solution Approach 2:
The patent introduces code domain orthogonality as an additional dimension for resource separation. By using orthogonal codes in the code domain, the system can support multiple simultaneous scheduling requests without increasing time-frequency resource consumption, thereby reducing access latency while maintaining transmission reliability.
3Productivity
If common scheduling request resources are shared by multiple users, then resource utilization efficiency improves, but orthogonal resource allocation becomes more complex to manage
Solution Approach 1:
The patent segments the shared scheduling request resources into orthogonal code channels, with each user assigned a specific orthogonal code. This segmentation approach allows multiple users to share the same time-frequency resources while maintaining clear separation through code orthogonality, simplifying resource management despite the shared nature of the resources.
Solution Approach 2:
The patent implements feedback mechanisms where the base station monitors scheduling request transmissions from multiple users on shared resources and dynamically adjusts orthogonal code assignments. This feedback loop enables efficient management of shared resources by resolving conflicts and optimizing code allocation based on actual system conditions.
Data Source
AI summary
In some implementations, a method implemented in an eNodeB (eNB) base station for single carrier frequency division multiple access SC-FDMA within a wireless system includes assigning to a user equipment a plurality of uplink scheduling request resources each comprising a plurality of subcarriers. It is determined that change in scheduling request resource used by the UE should be made. Upon determining that a change in scheduling request resource should be made, a command is transmitted to the UE instructing the UE to transmit scheduling requests on another of the plurality of assigned scheduling request resources.