Evolved Core Network Attachment Procedure Latency Reduction
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Solution Overview
Problem
Conventional wireless communication systems face inefficiencies in the attachment procedure, particularly in managing mobility and session contexts, which lead to increased latency and signaling complexities across different radio access technologies.
Innovation Solution
The evolved wireless communication system introduces a modified attachment procedure that includes a WTRU sending a modified Attach Request message to an evolved core network, performing authentication and authorization, and activating PDP contexts, which allocates and configures a default IP address, thereby constructing session and mobility management contexts that depend on IP address allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional GPRS attach procedure is used, then mobility management and session management are handled separately through multiple signaling steps, but this results in increased latency and signaling complexity
Solution Approach 1:
The patent combines mobility management (MM) and session management (SM) procedures into a single integrated attach process. The network constructs both SMM and PDP contexts during one attach procedure, eliminating the need for separate signaling exchanges for each management type, thereby reducing overall attachment latency while maintaining reliable mobility and session management.
Solution Approach 2:
The network performs preliminary construction of both SMM and PDP contexts during the initial attach procedure before actual data transmission begins. By pre-establishing both mobility and session management contexts in advance, the system avoids subsequent delays that would occur if these contexts needed to be established separately when data transmission is initiated.
2Adaptability or versatility
If separate MM and SM contexts are maintained as in conventional systems, then mobility and session management are independent, but this increases signaling complexity and setup delay
Solution Approach 1:
The patent merges the construction of SMM and PDP contexts into a unified process within the network. Both contexts are established simultaneously during the attach procedure rather than through separate independent procedures, reducing signaling complexity while preserving the adaptability needed for different mobility and session management scenarios.
Solution Approach 2:
The attach procedure is designed to serve multiple functions simultaneously: it establishes mobility management context, session management context, and default IP address allocation in a single universal process. This multi-functional approach reduces the need for multiple specialized procedures while maintaining the flexibility required for various management scenarios.
3Ease of manufacture
If conventional attach procedure without integrated context construction is used, then procedure implementation is simpler, but data rate handling and interoperation efficiency are reduced
Solution Approach 1:
The network performs preliminary construction of complete communication contexts including SMM, PDP, and default IP address allocation during the initial attach procedure. By preparing all necessary contexts in advance, the system enables more efficient data rate handling and interoperation from the outset, avoiding the need for additional setup steps that would delay productive data transmission.
Data Source
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Figure 2A~2B
Figure 3A
AI summary
A wireless communication system and method of implementing an evolved system attachment procedure are disclosed. The system includes a first core network and a second core network which is evolved from the first core network. A wireless transmit/receive unit (WTRU) sends an attach request message to the second core network. The second core network activates a packet data protocol (PDP) context and sends an attach accept message to the WTRU. The attach accept message includes information regarding the PDP context. The second core network constructs a session and mobility management (SMM) context for session management (SM) and mobility management (MM) for the WTRU.