F-DPCH Timing Offset Segmentation for Channel Capacity
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Solution Overview
Problem
Current wireless communication systems, such as W-CDMA, face limitations in channel capacity due to the requirement that all base stations in a mobile's active-set transmit power control bits with the same timing offset, leading to restricted support for the number of mobiles and reduced channel capacity.
Innovation Solution
Introducing base station-specific slot formats for the Fractional Dedicated Physical Channel (F-DPCH) with varying timing offsets for power control bits, allowing each base station to use the best available offset and increasing channel capacity by packing more F-DPCHs on the same code channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all base stations transmit power control bits with the same timing offset, then the mobile's processing time and frame timing remain simple and synchronized, but the channel capacity is limited and the number of supported mobiles is restricted
Solution Approach 1:
The patent segments the single timing offset parameter into multiple base station-specific timing offsets. Each base station in the active set is assigned a distinct timing offset value, allowing independent optimization of power control bit transmission timing for each base station. This segmentation enables multiple F-DPCHs to be packed on the same code channel by distributing them across different timing offsets, thereby increasing channel capacity without affecting mobile processing complexity.
2Quantity of substance
If base station-specific slot formats with varying timing offsets are introduced, then more F-DPCHs can be packed on the same code channel, but the system complexity increases
Solution Approach 1:
The patent applies local quality by allowing each base station to have its own specific slot format characteristics, particularly regarding timing offsets for power control bits. Rather than enforcing a uniform slot format across all base stations, the system permits local variations in timing offset values while maintaining overall frame structure compatibility. This enables each base station to optimize its power control transmission timing independently, maximizing the number of mobiles that can be supported on the same code channel.
Data Source
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AI summary
In accordance with a method for increasing the capacity of a channel in a communications system, characteristics of a channel may be evaluated. The channel may include a plurality of slots, and the slots may have a slot format among a set of slot formats. A slot format among the set of slot formats may be selected. The selection may be based on the evaluated characteristics of the channel. Selecting the slot format may include selecting the position of a signal within each of the plurality of slots. The position of the signal may be different for each of the slot formats. The signal may be transmitted in each of the plurality of slots over the channel.