MME UE ID Indication for eNB Context Setup
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Solution Overview
Problem
In wireless communication systems, especially in LTE-A, machine-type communications (MTC) face challenges in efficiently transmitting user equipment (UE) identities, particularly when initial context setup procedures are not performed, leading to issues in recognizing UE IDs by the eNB, which affects data transmission and reception, especially for UEs with multiple data packets.
Innovation Solution
The solution involves improved S1 signaling where the MME transmits the UE ID to the eNB, either through a connection establishment indication message or a UE ID indication message, ensuring the eNB can identify the UE even when initial context setup is not performed, allowing for efficient data transmission and reception by associating the correct UE with uplink and downlink data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If initial context setup procedure is not performed to reduce signaling overhead, then signaling efficiency is improved, but eNB cannot recognize UE ID leading to data transmission failure
Solution Approach 1:
The MME performs preliminary action by determining the UE ID before data transmission and proactively notifying the eNB of the UE ID in advance through indication messages. This allows the eNB to have the UE ID ready before actual data transmission occurs, eliminating the need for initial context setup procedure while ensuring reliable UE ID recognition.
Solution Approach 2:
The MME acts as an intermediary between the UE and eNB by extracting and forwarding the UE ID information to the eNB through indication messages. This intermediary action enables the eNB to obtain necessary UE identification information without performing the complete initial context setup procedure, thus reducing signaling overhead while maintaining reliability.
2Device complexity
If UE ID transmission is skipped to simplify the protocol, then device complexity is reduced, but data association between UE and eNB fails
Solution Approach 1:
The MME extracts only the essential UE ID information from the complete initial context setup procedure and transmits it separately through indication messages to the eNB. This extraction approach allows the system to skip the complex initial context setup procedure while still delivering the critical UE ID information needed for data association.
Solution Approach 2:
The UE ID information is determined and transmitted in advance through indication messages before actual data transmission. This preliminary transmission of essential information simplifies the protocol by eliminating the need for complex initial context setup while ensuring the eNB has the necessary UE ID for proper data association.
3Productivity
If multiple data packets are transmitted without UE ID notification, then data throughput is improved, but correct data routing to UE becomes impossible
Solution Approach 1:
The MME notifies the eNB of the UE ID in advance through indication messages before multiple data packets are transmitted. This preliminary notification ensures the eNB has the correct UE ID information ready, enabling accurate data routing for multiple packets while maintaining high data throughput without routing errors.
Data Source
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AI summary
Provided are a method for receiving, by a base station, a user equipment identity (UE ID) in a wireless communication system, and a device for supporting the same. The base station transmits, to a mobility management entity (MME), uplink data and release assistance information transmitted by the UE and receives the UE ID from the MME, wherein the release assistance information can indicate whether transmission of downlink data according to transmission of uplink data is expected.