Uplink Data Transmission in Handover Areas Using E-DCH and DCH
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Solution Overview
Problem
In WCDMA communication systems, User Equipment (UE) faces challenges in efficiently transmitting uplink data when moving between cells that support Enhanced Uplink Dedicated Channels (E-DCH) and those that do not, as existing technologies lack a seamless method to switch between E-DCH and Uplink Dedicated Channels (DCH) for optimal data transmission.
Innovation Solution
A method and apparatus that configure first and second radio bearers for uplink data transmission, using E-DCH if at least one cell supports it and DCH otherwise, allowing the UE to dynamically select the appropriate transmission channel based on cell capabilities and radio network controller instructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE frequently switches between E-DCH and DCH when moving between cells with different capabilities, then the transmission path can be optimized for current cell support, but the signaling overhead and delay increase due to frequent radio bearer reconfigurations
Solution Approach 1:
The patent configures both E-DCH radio bearer and DCH radio bearer in advance before the UE moves between cells. The network pre-configures multiple radio bearers with different transport channels (E-DCH and DCH) so that when the UE moves to a cell supporting E-DCH, the enhanced bearer is already available for immediate use, and when moving to a non-E-DCH cell, the legacy bearer can be used without reconfiguration delay. This preliminary configuration eliminates the need for frequent radio bearer reconfiguration during mobility.
Solution Approach 2:
The patent creates a universal communication mechanism where the UE is equipped with multiple radio bearers that can function across different cell types. The E-DCH radio bearer and DCH radio bearer are both configured and maintained, allowing the UE to universally operate in both E-DCH supporting cells and non-E-DCH cells without requiring channel switching or reconfiguration. This multi-functionality approach ensures seamless mobility across heterogeneous networks.
2Adaptability or versatility
If the UE maintains only DCH for backward compatibility, then operation in non-E-DCH cells is ensured, but transmission efficiency is reduced when in E-DCH supporting cells
Solution Approach 1:
The patent segments the radio bearer configuration into two distinct bearers: an E-DCH radio bearer optimized for enhanced uplink transmission in E-DCH supporting cells, and a DCH radio bearer for backward compatibility in non-E-DCH cells. Each bearer is independently configured with appropriate transport channels, allowing the UE to select the appropriate bearer based on the current cell capabilities. This segmentation enables the system to achieve both high transmission efficiency in E-DCH cells and broad compatibility across all cell types.
Data Source
AI summary
A method and an apparatus for uplink data transmission using an enhanced uplink dedicated channel (E-DCH) in a mobile telecommunication system which employs a code division multiple access (CDMA) scheme are provided. User equipment (UE) located in a handover area related to a cell supporting the E-DCH and a cell not supporting the E-DCH configures a radio bearer including the E-DCH and a radio bearer including an uplink dedicated channel (DCH) such that they are mapped to one uplink logical channel, and transmits uplink data through any one radio bearer selected by the UE or a serving radio network controller (SRNC). Thus, a delay time due to radio bearer reconfigurations and signaling overhead for the radio bearer reconfigurations are reduced.