Idle State Data Transmission via Contention Channel
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Solution Overview
Problem
In an evolved packet core (EPC) system, user equipment (UE) in an idle state requires multiple steps for data transmission, leading to excessive signaling consumption when sending small or occasional data packets.
Innovation Solution
A data sending method that uses an uplink contention data channel for UE to send a physical-layer-protocol-data-unit carrying a data packet, with optional inclusion of a synchronization code when uplink timing advance is unknown, and employs acknowledgement mechanisms to reduce the number of interaction steps and signaling required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE sequentially completes random access process, RRC connection establishment process, security activation process, radio bearer establishment process, data sending process, and RRC connection release process, then data transmission reliability is improved, but signaling consumption increases
Solution Approach 1:
The patent segments the data transmission process into two distinct modes: idle state data transmission using contention-based random access, and connected state data transmission using dedicated resources. This segmentation allows UE to choose the appropriate mode based on data transmission needs, avoiding unnecessary signaling steps for small or occasional data packets while maintaining reliability for larger transmissions
Solution Approach 2:
The patent implements preliminary action by pre-configuring contention-based random access resources and parameters before UE needs to transmit data in idle state. The network pre-allocates uplink contention data channel resources, timing advance values, and other transmission parameters, allowing UE to immediately transmit data packets without going through the complete six-step connection establishment process
2Measurement precision
If UE performs complete connection establishment process for each data packet transmission, then transmission accuracy is improved, but transmission time increases
Solution Approach 1:
The patent introduces dynamic state transitions between idle state and connected state based on data transmission requirements. UE can dynamically switch between contention-based random access for idle state transmissions and dedicated resource allocation for connected state transmissions, optimizing both accuracy and time based on real-time needs
Solution Approach 2:
The network performs preliminary actions by pre-configuring and maintaining contention-based random access resources available to UE in idle state. This preliminary preparation allows UE to quickly transmit data packets with acceptable accuracy without undergoing the time-consuming complete connection establishment process
Data Source
AI summary
In the embodiments of the present invention, UE can complete, by using only two interaction steps instead of six steps in the prior art, a process of sending a data packet to an eNodeB. Even a random access process in the six steps in the prior art includes four interaction steps, and by contrast, in the embodiments, signaling that needs to be consumed on an eNodeB when the UE sends data can be significantly reduced. This is relatively suitable for a scenario in which small data or occasional data is sent.