Multicast CRC Masking for Non-MBS Resource Allocation
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Solution Overview
Problem
Conventional communication systems lack an efficient multicast transmission method, particularly in non-MBS regions, restricting the use of multicast-based group calls.
Innovation Solution
A method and apparatus for managing multicast transmission by generating a cyclic redundancy check (CRC) mask using a multicast group identifier (MGID) or multicast group connection identifier (MGCID), and transmitting signaling messages for resource allocation and group management in unicast or multicast fashion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multicast transmission is applied in non-MBS regions, then resource utilization and call management efficiency are improved, but the system lacks sufficient definition and efficient multicast transmission methods
Solution Approach 1:
The patent applies universality by enabling multicast transmission functionality in non-MBS regions, allowing the same multicast mechanisms to operate across different region types (MBS and non-MBS). The base station and terminals use universal multicast procedures including CRC mask generation, message transmission, and acknowledgment handling that work consistently regardless of region type, thereby improving resource utilization without requiring separate complex definitions for each region.
2Ease of operation
If group call using multicast is implemented, then call management efficiency is improved, but restriction in use of multicast-based group call exists in non-MBS region
Solution Approach 1:
The patent applies segmentation by dividing the group call management into distinct message types and procedures: initial group call setup messages, ongoing call control messages, and termination messages. Each message type uses specific CRC mask generation methods and transmission procedures tailored to its function. This segmentation allows flexible adaptation of multicast group calls to different operational scenarios in both MBS and non-MBS regions, removing restrictions while maintaining efficient management.
3Measurement precision
If CRC mask is generated using MGID or MGCID for multicast message identification, then message identification accuracy is improved, but additional processing steps are required
Solution Approach 1:
The patent applies preliminary action by pre-defining CRC mask generation rules based on message type and region type. The base station determines the appropriate CRC mask generation method (using MGID for MBS regions, MGCID for non-MBS regions, or alternative methods) before transmitting multicast messages. Terminals are pre-configured with corresponding CRC mask verification procedures. This preliminary establishment of identification rules enables accurate message identification without requiring complex real-time processing during message transmission and reception.
Data Source
AI summary
A multicast management method of a base station is provided. The base station generates a CRC for a message including resource allocation information of a multicast group including a plurality of terminals, and masks the CRC by a CRC mask. The base station adds the masked CRC to the message, and then transmits the message to which the masked CRC is added to the multicast group.