Local BM-SC Deployment for Group Communication Delay Reduction
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Solution Overview
Problem
In group communication systems, data transmission delays are significant due to the need for determining a synchronization cycle for multiple eNBs in multicast transmission, which affects the efficiency of data delivery in LTE networks.
Innovation Solution
Deploying a local broadcast/multicast service center (L-BM-SC) at the location of an evolved NodeB (eNB) to establish a direct bearer between the L-BM-SC and the GCS AS, allowing packets to be sent directly to the eNB, thereby eliminating the need for synchronization cycle determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a synchronization cycle is determined for multicast transmission to multiple eNBs, then data can be transmitted simultaneously to multiple eNBs, but data transmission delay becomes relatively large
Solution Approach 1:
The patent segments the multicast transmission path by introducing a local BM-SC at each eNB location. Instead of one centralized BM-SC transmitting to all eNBs simultaneously (which requires long synchronization cycles), the system divides transmission into local segments where each eNB receives data from its own local BM-SC, eliminating the need forč·¨-site synchronization and reducing transmission delay while maintaining simultaneous delivery capability
Solution Approach 2:
The patent introduces local BM-SC instances as intermediaries between the core network and individual eNBs. These local BM-SCs act as mediators that receive data from the GCS AS and deliver it to local eNBs without requiring coordination with remote eNBs, thus eliminating synchronization delays while enabling simultaneous multicast transmission to multiple locations
2Device complexity
If a centralized BM-SC is used for multicast transmission, then data can be managed centrally, but transmission delay increases due to path length variations
Solution Approach 1:
The patent applies local quality by deploying BM-SC functionality locally at each eNB site rather than maintaining a single centralized BM-SC. Each local BM-SC is optimized for its specific location, managing data transmission locally without being constrained by variations in path lengths from a remote centralized BM-SC, thus reducing transmission delay while maintaining centralized management capabilities through coordination with the GCS AS
Data Source
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AI summary
The present invention relates to the communications field and provides a group communication method, apparatus, and system. The method includes: obtaining location information of UE; when determining that an L-BM-SC is deployed at a location of an eNB to which the UE belongs, determining, according to the location information of the UE, an MCE that manages the eNB to which the UE belongs; and sending a first bearer activation request to the MCE, where the first bearer activation request includes the location information of the UE, so that the MCE determines, according to the location information of the UE, a first L-BM-SC deployed at the location of the eNB to which the UE belongs, and establishes a bearer between the first L-BM-SC and a GCS AS, where the bearer between the first L-BM-SC and the GCS AS is used by the GCS AS to send a packet to the first L-BM-SC. In this way, a problem that a data transmission delay is relatively large in existing group communication is resolved, and the data transmission delay is shortened.