WCDMA Uplink Gain Factor Configuration via Reference TF Selection
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Solution Overview
Problem
Current methods for configuring gain factors in WCDMA telecommunication systems require significant signaling resources, leading to increased overhead in E-DCH transmission, particularly in uplink services, as they need to notify all TFs and reference TFCs for gain factor calculation, which is inefficient.
Innovation Solution
A method that determines gain factors for E-DCH transmission by selecting a reference TF from signaled TFs using predefined rules, reducing the need for separate signaling of reference TFs for all available TFs, thereby minimizing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all TFs and reference TFCs are signaled for gain factor calculation, then gain factor configuration accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the necessary reference TFC information from the complete set of TFs, rather than signaling all TFs and their corresponding reference TFCs. By selecting a subset of reference TFCs (e.g., only the first reference TFC or reference TFCs at specific intervals), the system achieves sufficient gain factor calculation accuracy while significantly reducing signaling overhead.
Solution Approach 2:
Instead of providing complete gain factor information for all TFs (excessive action), the patent applies partial action by signaling gain factors only for a subset of reference TFCs. The UE then calculates gain factors for other TFs based on these partial reference values, achieving the necessary functionality with reduced signaling resources.
2Reliability
If separate signaling of reference TFs is performed for all available TFs, then gain factor calculation reliability is improved, but device complexity increases
Solution Approach 1:
The patent makes the reference TFC information universal by having a single reference TFC (or a small set of reference TFCs) serve multiple functions: it provides the basis for calculating gain factors for multiple different TFs. This multi-functional approach eliminates the need for separate reference TFC signaling for each TF, reducing complexity while maintaining calculation reliability.
Solution Approach 2:
The patent applies preliminary action by pre-configuring reference TFCs and their gain factors before actual data transmission. The UE stores these reference values and uses them to calculate gain factors for other TFs during operation, eliminating the need for real-time separate signaling of reference TFs for each TF and reducing procedural complexity.
Data Source
AI summary
A method for configuring gain factors in a WCDMA telecommunication system is provided in which the gain factor for defining power required for normal reception of uplink data in an environment supporting an uplink service over an E-DCH can be configured using minimal signaling information. First gain factors for first TFs corresponding to a part of a TF set including a plurality of TFs available for an uplink service are received. One of the first TFs is determined as a reference TF for a second TF other than the first TFs in the TF set. Then, a second gain factor for the second TF is calculated using the first gain factor for the determined reference TF. The second gain factor is used for transmitting or receiving uplink data.