eNodeB Shared Scheduling Request Resource Allocation
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Solution Overview
Problem
Current LTE systems face challenges in managing the increasing population of connected-mode users, leading to high access latency and inefficient use of uplink resources due to the dedicated scheduling request (SR) approach, which results in sub-optimal resource utilization and increased latency.
Innovation Solution
Implementing a common or shared SR resource using existing PUCCH formats, such as PUCCH format 2 or 3, to explicitly convey user IDs, allowing multiple users to share the same resource and reducing the need for physical layer redesign, thereby enhancing resource efficiency and lowering access latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If dedicated scheduling request (SR) resources are assigned to each user, then access latency is reduced for individual users, but resource efficiency deteriorates and access latency increases for the overall system
Solution Approach 1:
Multiple users are merged into a single group that shares common scheduling request resources. Instead of assigning dedicated SR resources to each user, the patent combines multiple users into groups where users within the same group share the same SR resources, thereby improving resource efficiency while managing access latency through group-based scheduling.
Solution Approach 2:
Common SR resources are designed to serve multiple users simultaneously. The scheduling request resources are made universal by allowing any user within a group to utilize the same SR resources, transforming dedicated resources into multi-functional shared resources that can handle requests from multiple users.
2Ease of operation
If dedicated SR resources are assigned to each user, then individual user access is improved, but system capacity deteriorates
Solution Approach 1:
Users are merged into groups that share common SR resources. By combining multiple users into single groups with shared resources, the system increases overall capacity to handle more users with the same resource pool, while individual users within each group maintain ease of access through their group's dedicated SR resources.
Solution Approach 2:
The patent introduces a group dimension to the resource allocation hierarchy. Instead of flat individual user-to-resource mapping, it creates a two-dimensional structure where users are organized into groups, and each group is assigned SR resources. This dimensional change allows the system to scale capacity by creating more groups rather than requiring more individual resources.
3Loss of energy
If common SR resources are shared by multiple users, then resource efficiency is improved, but access latency increases due to contention
Solution Approach 1:
The user population is segmented into multiple groups, each with its own set of common SR resources. By dividing users into segments (groups) rather than having all users compete for a single pool of resources, the contention within each group is reduced, thereby lowering access latency while maintaining resource efficiency through shared resources within each segment.
Solution Approach 2:
The patent implements dynamic group-based scheduling where users can be assigned to different groups and utilize different SR resources based on current system conditions and user activity patterns. This dynamic allocation allows the system to adapt to varying loads and minimize contention-induced latency while optimizing resource efficiency in real-time.
Data Source
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Figure 3~4
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.