Group Call RACH Preamble Subset for Latency Reduction
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Solution Overview
Problem
Current telecommunication systems face inefficiencies in establishing group calls, particularly due to inadequate resource grants during the random access procedure, leading to increased latency and suboptimal resource utilization.
Innovation Solution
Implementing a subset of predetermined random access preambles specifically for group calls, which trigger a higher uplink resource grant than default RACH responses, enabling more efficient resource allocation and reduced latency in setting up group calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a default RACH response is used for group call setup, then the random access procedure is simple, but the uplink resource grant is insufficient leading to increased latency
Solution Approach 1:
The patent applies local quality by differentiating the RACH response based on the type of call setup. Instead of using a uniform default response for all RACH requests, the system provides a specialized uplink resource grant configuration specifically for group call setups. This localized optimization ensures that group calls receive the appropriate resource allocation (greater uplink resource grant) to reduce latency, while other call types continue to use the standard procedure.
Solution Approach 2:
The patent implements preliminary action by pre-configuring a subset of predetermined random access preambles that are specifically associated with group calls. When a wireless device sends a RACH preamble from this predefined subset, the access node is already prepared to provide the enhanced uplink resource grant. This advance preparation eliminates the need for complex real-time resource allocation decisions, thereby reducing setup latency while maintaining procedural simplicity.
2Productivity
If greater uplink resource grant is provided for group calls, then resource efficiency is improved, but the complexity of resource allocation increases
Solution Approach 1:
The patent applies segmentation by dividing the random access preambles into different subsets - a first subset for group calls and a second subset for other purposes. This segmentation allows the system to manage resource grants differently for different call types. By segmenting the preambles, the access node can selectively apply greater uplink resource grants only to group call setups without complicating the overall resource allocation process for other call types.
Solution Approach 2:
The patent utilizes parameter changes by modifying the uplink resource grant parameter based on the detected call type. When a group call is detected through the use of a predefined RACH preamble subset, the system changes the resource grant parameter from the default value to a greater value. This parameter adjustment optimizes resource allocation efficiency for group calls while maintaining a straightforward configuration approach, as the changes are based on predefined thresholds and conditions.
Data Source
AI summary
Systems and methods are described for reducing latency for a group call. A group call random access (RACH) preamble selected from a subset of predetermined random access preambles associated with a group call may be received at an access node from a first wireless device, wherein the group call random access preamble indicates to the access node that a group call is to be established. A RACH response may be transmitted to the first wireless device comprising an uplink resource grant associated with a group call setup, wherein the uplink resource grant is greater than uplink resource grant associated with a default RACH response. And the group call may be established by communicating with the first wireless device based on the uplink resource grant associated with group call setup, wherein the group call is established between at least the first wireless device and a second wireless device.