Common Uplink Resource Handling for Idle UE Collision Detection
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Solution Overview
Problem
In cellular radio communications, UEs in idle mode without a Radio Network Temporary Identifier (RNTI) face challenges in managing common uplink radio resources, particularly the common enhanced-dedicated channel (E-DCH) resources, due to potential collisions when multiple UEs use the same preamble, leading to errors in data transmission and assembly at higher protocol layers.
Innovation Solution
The solution involves adding error detection bits, such as cyclic redundancy code (CRC) bits, to data units transmitted over the common uplink radio resource. These bits are used to segment and reassemble data at lower protocol layers, allowing the network to determine the correctness and origin of the data, ensuring that only correctly assembled data units are passed to higher protocol layers, thus preventing collisions and errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If common uplink E-DCH resources are shared among multiple UEs in idle mode, then resource utilization efficiency is improved, but collision and errors occur due to lack of unique identification
Solution Approach 1:
The data unit is segmented into multiple segments at a lower protocol layer, with each segment being transmitted separately over the common uplink radio resource. This segmentation allows the network to identify and correctly assemble segments from the same UE using error detection bits, preventing collisions while enabling efficient resource sharing.
Solution Approach 2:
Error detection bits (such as CRC bits) are introduced as an intermediary mechanism between the data unit and the segmentation process. These bits are added to the data unit before segmentation and transmitted with the segments, enabling the network to verify segment origin and ensure reliable reassembly without requiring unique UE identification in idle mode.
2Reliability
If error detection bits are added to data units, then data transmission reliability is improved, but protocol overhead increases
Solution Approach 1:
Error detection bits are added only to data units that require segmentation and transmission over common uplink resources, rather than to all data units in the system. This partial application of the error detection mechanism reduces unnecessary overhead while maintaining reliability where it is most needed.
Data Source
AI summary
The technology in this application provides for efficient use of a common uplink radio resource, like the common E-DCH resource. A UE lacking a valid radio network identifier, e.g., a UE in an idle mode, receives a data unit and adds error detection bits to generate a new data unit. The new data unit is divided into segments at a lower protocol layer which are provided for transmission to the network via the common uplink radio resource. A network node detects lower protocol layer data unit segments received on the common uplink radio resource and assembles them into an assembled data unit at a higher protocol layer. Error detection bits included with the assembled data unit are used to determine if the assembled data unit includes correctly received data unit segments, e.g., data unit segments from the same UE.