UE Scheduling Request Resource Sharing via User ID Encoding
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Solution Overview
Problem
Current LTE systems face challenges in efficiently managing scheduling requests due to increased connected-mode user populations, leading to high access latency and sub-optimal resource utilization, particularly with the dedicated SR approach which results in excessive resource reservation and scarce SR opportunities.
Innovation Solution
Implementing a contention-based scheduling request method using a common or shared SR resource, where multiple users share PUCCH or PUSCH resources, allowing for explicit user ID transmission within PUCCH format 2 or 3, reducing the need for physical layer redesign and enhancing resource efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated SR resources are allocated to each user, then each user can send scheduling requests reliably, but resource reservation becomes excessive and resource utilization deteriorates
Solution Approach 1:
Multiple users share common SR resources (PUCCH or PUSCH) instead of each user having dedicated resources. Users transmit their SRs on shared resources, and the eNB identifies individual users through explicit user ID transmission in the SR message, combining multiple users' SR functions into common resources while maintaining individual user identification
Solution Approach 2:
Common SR resources serve multiple users simultaneously for scheduling requests. The same PUCCH or PUSCH resources are universally used by multiple users, with user identification achieved through explicit user ID fields in the SR message rather than dedicated resource allocation
2Reliability
If dedicated SR resources are allocated to each user, then SR transmission is guaranteed, but SR opportunities become scarce and access latency increases
Solution Approach 1:
Multiple users share common SR resources (PUCCH or PUSCH) instead of each user having dedicated resources. Users transmit their SRs on shared resources, and the eNB identifies individual users through explicit user ID transmission in the SR message, combining multiple users' SR functions into common resources while maintaining individual user identification
Solution Approach 2:
The SR resource allocation transitions from static dedicated assignment to dynamic shared access. Users can access common SR resources when needed, with the eNB dynamically identifying users through user ID fields in the SR messages, allowing flexible resource utilization based on actual SR needs
3Quantity of substance
If common SR resources are shared by multiple users, then resource utilization improves, but user identification complexity increases
Solution Approach 1:
An explicit user ID field is introduced as an intermediary element in the SR message structure. This user ID (or portion thereof) is transmitted within the PUCCH format 2 or 3 signal, serving as a mediator that enables the eNB to identify which user is sending the SR on the common resources without requiring dedicated physical layer resources for each user
Solution Approach 2:
The SR message structure is modified to include explicit user ID parameters. By changing the parameter structure of the SR transmission to include user identification information, the system enables multiple users to share common resources while maintaining the ability to identify and schedule individual users
Data Source
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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.