Shared Scheduling Request Resources for Wireless Uplink Grant Latency
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Solution Overview
Problem
In wireless communication systems, the latency associated with obtaining uplink grants for transmitting user plane data can be high due to the need for dedicated scheduling request (SR) resources, which also increases overhead on control channels, especially as the number of devices increases and collisions occur on shared resource channels.
Innovation Solution
Providing shared SR resources to devices, where identifiers related to these resources are signaled, allowing devices to transmit SRs over shared SR resources without waiting for dedicated resources, thereby reducing delay and overhead on control channels, and grouping devices to transmit over shared SR resources based on similar properties such as channel conditions or quality of service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If dedicated SR resources are configured at frequent time intervals, then latency for obtaining uplink grants is reduced, but overhead on control channels increases
Solution Approach 1:
The patent merges dedicated SR resources with shared uplink resources by allowing devices to transmit SRs on shared resources (e.g., PUSCH) without requiring separate dedicated SR opportunities. This combines the SR function with existing shared data resources, reducing control channel overhead while maintaining low latency for uplink grant acquisition.
Solution Approach 2:
The patent enables shared uplink resources to serve multiple purposes: both data transmission and SR transmission. By making the shared resources universal for both functions, the system eliminates the need for dedicated SR resources, thereby reducing control channel overhead while preserving the ability to quickly request uplink grants.
2Quantity of substance
If devices transmit SRs over shared resource channels, then control channel overhead is reduced, but collisions between devices increase
Solution Approach 1:
The patent segments the shared resources into different SR resources associated with different groups of devices (e.g., different CB-RNTI groups). By dividing the shared resources into multiple segmented SR resources, the collision probability is reduced while still utilizing shared resources instead of dedicated ones, thus maintaining low control channel overhead.
Solution Approach 2:
The patent introduces group identifiers (CB-RNTI groups) as intermediaries that mediate between devices and shared resources. Devices are assigned to specific groups, and each group has associated SR resources. This intermediary grouping mechanism organizes access to shared resources, reducing collisions while allowing efficient use of shared channels.
3Productivity
If the number of devices at a base station increases, then system capacity is improved, but collision recovery time increases
Solution Approach 1:
The patent implements dynamic SR resource allocation where devices can switch between different SR resources based on their group assignments and current transmission needs. This dynamic approach allows the system to handle increased device capacity while managing collision recovery efficiently, as devices can adaptively select appropriate SR resources rather than being stuck with fixed dedicated resources that may collide.
Data Source
AI summary
In accordance with one or more embodiments and corresponding disclosure thereof, various aspects are described in connection with providing shared scheduling request (SR) resources to devices for transmitting SRs. Identifiers related to the shared SR resources can be signaled to the devices along with indications of the shared SR resources in given time durations. Thus, devices can transmit an SR over shared SR resources related to one or more received identifiers for obtaining an uplink grant. This can decrease delay associated with receiving uplink grants since the device need not wait for dedicated SR resources before transmitting the SR. In addition, overhead can be decreased on control channels, as compared to signaling dedicated SR resources and/or uplink grants. Moreover, identifiers related to SR resources can correspond to a grouping of devices, such that a device can transmit over shared SR resources related to a group including the device.