Shared Scheduling Request Resource for LTE Uplink Latency
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Solution Overview
Problem
Current scheduling request mechanisms in LTE wireless communication systems face challenges with increasing connected-mode user populations, leading to high access latency and inefficient use of uplink resources, particularly due to the dedicated SR approach which does not scale well and results in underutilization of resources.
Innovation Solution
A method is introduced where a common or shared scheduling request resource is assigned to multiple users, allowing them to transmit a user ID on a contention-based basis using existing PUCCH formats, such as PUCCH format 2 or 3, to efficiently manage scheduling requests and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated scheduling request resources are assigned to each user, then each user can reliably transmit scheduling requests, but resource utilization becomes inefficient and access latency increases with growing user population
Solution Approach 1:
Multiple users are assigned to share common scheduling request resources instead of each user having dedicated resources. Users transmit their user IDs on these shared resources, allowing the base station to identify and schedule multiple users efficiently, thereby improving resource utilization while maintaining reliable scheduling request transmission.
Solution Approach 2:
Common scheduling request resources serve multiple users simultaneously rather than being dedicated to a single user. The resources are designed to handle scheduling requests from any assigned user by incorporating user ID transmission, making the resources universal and adaptable to multiple users' needs.
2Reliability
If dedicated scheduling request resources are assigned to each user, then scheduling requests can be transmitted without contention, but access latency increases and the system does not scale well with larger user populations
Solution Approach 1:
Multiple users share common scheduling request resources and transmit their user IDs simultaneously. The base station processes these shared resources to identify multiple users, reducing access latency while maintaining reliable transmission through user ID encoding and orthogonal resource allocation.
3Productivity
If common scheduling request resources are shared by multiple users, then resource utilization improves and access latency reduces, but user identification becomes more complex
Solution Approach 1:
User IDs serve as an intermediary mechanism that enables the base station to identify individual users on shared resources. The user IDs are encoded into the scheduling request transmissions, allowing the base station to distinguish between multiple users without requiring complex identification protocols or additional signaling overhead.
Data Source
AI summary
In some implementations, a method implemented in a user equipment UE for use in a wireless system for single carrier frequency division multiple access SC-FDMA, the method including receiving an assignment of a scheduling request resource in the wireless system comprising a plurality of subcarriers. A user ID is encoded. An uplink control channel signal comprising the encoded user ID is transmitted on the plurality of subcarriers of the assigned scheduling request resource.