Soft Combining Scheduling Signals Uplink Packet Data
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Solution Overview
Problem
In mobile communication systems, especially in soft or softer handover regions, the reliability of scheduling signals and ACK/NACK signals is compromised due to reduced transmission power, leading to inefficiencies in uplink packet data service performance.
Innovation Solution
The implementation of a method and apparatus that allow for soft combining of scheduling signals and ACK/NACK signals across multiple cells, utilizing cell group information to improve detection performance and data rate determination for user equipment (UE) in a mobile communication system, involving a UE apparatus with a scheduling signal reception controller, demodulators, and a soft combiner, as well as Node B and RNC apparatuses for transmitting and managing these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soft or softer handover is implemented to improve connection continuity, then reliability is improved, but scheduling signal detection performance deteriorates due to reduced transmission power
Solution Approach 1:
The patent applies soft combining technique to merge multiple scheduling signals received from different cells into a single combined signal. The UE combines these signals based on cell group information to improve detection performance. This resolving mechanism merges the signals in a way that maintains the reliability benefits of soft handover while compensating for the reduced transmission power through constructive combination of signal components.
2Object-generated harmful factors
If transmission power is reduced for scheduling signals in soft handover regions, then interference is reduced, but signal reliability deteriorates
Solution Approach 1:
The patent uses soft combining to merge multiple lower-power scheduling signals from different cells into a combined signal that achieves sufficient reliability. By combining the energy from multiple cells, the system can operate at lower individual transmission power levels (reducing interference) while maintaining overall signal reliability through the cumulative effect of multiple signals.
3Area of stationary object
If multiple cells transmit scheduling signals independently, then coverage is improved, but signaling overhead increases
Solution Approach 1:
The patent combines multiple scheduling signals from different cells into cell groups, where signals within the same group are soft-combined. This approach maintains wide coverage by having multiple cells transmit signals while reducing redundancy and signaling overhead through the combining process, as the UE only needs to process one combined signal per cell group rather than independently processing each cell's signal.
Data Source
AI summary
A mobile communication system using an Enhanced Uplink Dedicated transport Channel (EUDCH) for uplink data transmission, wherein a user equipment (UE) receives cell group information from a radio network controller (RNC), and soft-combines scheduling signals or acknowledge/negative-acknowledge (ACK/NACK) signals received from cells belonging to the same cell group according to the cell group information, thereby improving detection performance.