Uplink Power Allocation for WCDMA High-Speed Packet Transmission
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Solution Overview
Problem
In WCDMA systems, high-speed packet transmission is hindered by interference and noise rise, leading to decreased reception quality and throughput, particularly due to irregular power requirements for control signals like ACK/NACK, which can cause line cut-offs and increased transmission delays.
Innovation Solution
A radio communication system that dynamically adjusts power allocation for uplink channels based on the number of downlink packet transmission notification signals, ensuring sufficient power for control signals while optimizing power usage for high-speed packet transmission by prioritizing control signal transmission over data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission power is increased to support high-speed transmission, then transmission rate is improved, but power exceeds maximum limits causing line cut-offs and increased delays
Solution Approach 1:
The patent implements dynamic power allocation where the power control unit adjusts the power of the first channel (E-DPCH) in real-time based on the power sum of other uplink channels. This dynamic adjustment allows the system to adapt power distribution to changing transmission conditions, enabling high-speed transmission when power is available while preventing line cut-offs when power limits are approached.
Solution Approach 2:
The patent changes the power parameter of the first channel based on the calculated power sum of other channels. By modifying the power allocation parameter dynamically rather than using fixed power levels, the system can optimize transmission rate while staying within maximum power limits, thus improving productivity without sacrificing reliability.
2Reliability
If power is allocated to control signals, then reception quality of control channels is improved, but power for data transmission is reduced
Solution Approach 1:
The patent dynamically changes the power parameter of the first channel (E-DPCH) based on the power sum of other uplink channels. This allows flexible power allocation that can prioritize control signals when needed while maximizing data transmission power when power headroom is available, resolving the contradiction between control signal quality and data throughput.
Solution Approach 2:
The power control unit provides dynamic power adjustment for the first channel, enabling the system to adapt power distribution between control and data channels based on real-time conditions. This dynamic approach allows the system to optimize the balance between control signal reception quality and data transmission throughput.
3Device complexity
If base station control device manages retransmission, then system control is simplified, but retransmission delay increases
Solution Approach 1:
The patent extracts the retransmission control function from the base station control device and relocates it to the mobile station. The mobile station's transmission unit directly controls retransmission of the first channel based on power sum conditions, eliminating the need for base station intervention in rapid power adjustments. This reduces control system complexity for time-critical operations and significantly reduces retransmission delay.
Solution Approach 2:
The mobile station performs self-service by autonomously controlling the power and retransmission of the first channel based on local power sum calculations. This self-service approach eliminates dependency on base station control for rapid power adjustments, reducing both system complexity and retransmission delay while maintaining effective power management.
Data Source
AI summary
The mobile station 2-1 determines whether a current maximum transmission rate is sufficient or not in a predetermined cycle by using a maximum transmission rate R indicated by a pointer, a volume Q of data accumulated in the buffer 22-1 and a requested delay T determined according to service of data. The mobile station 2-1 transmits a determination result as an RR signal in a predetermined control signal field within an uplink E-DPCH to the base station 1. The base station 1 receives an RR signal from the mobile station 2-1, determines an increment/decrement of the maximum transmission rate allowed for the mobile station 2-1 to use such that a noise rise fails to exceed a predetermined threshold value and notifies the mobile station 2-1 of the determination as an RG signal by a downlink E-DPCCH. The mobile station 2-1 ups or downs the position of the pointer according to the RG signal.