Group Scheduling for MTC Signaling Congestion
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Solution Overview
Problem
Current solutions for managing signaling congestion in radio access communication networks, such as those used in MTC communications, are inadequate, leading to inefficiencies and performance degradation due to high congestion levels, especially when a large number of MTC devices attempt to connect simultaneously.
Innovation Solution
Implementing a system where a base station broadcasts a group scheduling message to a terminal group, allowing for scheduled sequence transmissions and reducing collisions by designating a group delegate to complete access procedures on behalf of the group, thereby reducing signaling overhead and improving network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If backoff-based scheme is used to manage MTC device connections, then device connection management is simplified, but signaling congestion persists at high levels
Solution Approach 1:
Multiple MTC devices are merged into a single group represented by one group delegate. The base station communicates with the group delegate instead of individual devices, combining multiple signaling paths into one. This reduces signaling congestion while maintaining simplified management through the group structure.
Solution Approach 2:
A group delegate is introduced as an intermediary between MTC devices and the base station. The group delegate receives group scheduling messages from the base station and distributes them to group members, while also collecting group transmissions and forwarding them to the base station. This intermediary structure reduces direct signaling overhead to the base station.
2Productivity
If pull-based paging is used to page MTC devices, then network control over device access is improved, but contention-based RACH causes signaling congestion and access delays
Solution Approach 1:
Multiple MTC devices are merged into a single group for paging purposes. The base station sends a single group scheduling message to the group delegate representing multiple devices, combining multiple paging operations into one. This maintains network control while eliminating the need for contention-based RACH from multiple individual devices.
Solution Approach 2:
The group delegate is pre-configured with group membership information and scheduling parameters through group scheduling messages. When paging is needed, the base station can immediately page the group delegate who already has the necessary information to coordinate the group response, eliminating the need for contention-based random access procedures.
3Reliability
If RACH resources are separated or dynamically allocated for MTC devices, then access performance is improved, but system complexity and resource management overhead increase
Solution Approach 1:
MTC devices are merged into groups that share common RACH resources through a group delegate. Instead of allocating separate RACH resources to each MTC device or managing complex dynamic allocations, the group delegate represents the entire group using standard RACH procedures. This maintains reliable access performance while simplifying resource management.
4Quantity of substance
If group scheduling is implemented for MTC devices, then signaling overhead is reduced, but coordination complexity among group members increases
Solution Approach 1:
A group delegate is introduced as an intermediary that handles all coordination complexity among group members. The delegate receives group scheduling messages from the base station, determines which members should transmit, and coordinates their scheduled sequence transmissions. This concentrates coordination complexity in a single entity while reducing overall signaling overhead to the base station.
Data Source
AI summary
In an example embodiment, a system may include a base station configured to broadcast a group scheduling message configured to be received at a terminal group that includes a plurality of terminals. The base station may further be configured to receive group transmissions transmitted at the plurality of terminals in a scheduled sequence in response to the group scheduling message. The base station may further be configured to broadcast a group reply in response to receiving the group transmission.