Base Station Bandwidth Allocation for Uplink Throughput Control
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Solution Overview
Problem
In communication systems, particularly in UMTS with FDD enhanced uplink, managing high-throughput dedicated channels (E-DCH) to balance transmission throughput and reception quality is challenging, especially in macrodiversity situations where each Node B has unique interference and reception capacity criteria, leading to difficulties in coordinating maximum throughput thresholds across multiple base stations.
Innovation Solution
A method where each base station determines available bandwidth based on its reception capacity and interference level, transmitting this information on a common downlink channel, and then provides a percentage-based throughput limit to each radio terminal on a dedicated channel, allowing for independent updates and flexible resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the Node B transmits maximum throughput information to each UE on a dedicated downlink channel by puncturing bits, then the UE receives individualized throughput control, but the reception quality of downlink information degrades
Solution Approach 1:
The patent segments the throughput control information transmission into two parts: common maximum throughput information transmitted on shared downlink channels, and individual UE-specific adjustments transmitted through uplink channel quality feedback. This avoids puncturing downlink traffic channels while still providing personalized throughput control.
Solution Approach 2:
The patent introduces the uplink channel quality feedback as an intermediary mechanism. Instead of directly transmitting throughput limits on downlink channels, the Node B uses uplink channel conditions as a mediator to indirectly control UE transmission throughput, thereby avoiding downlink channel puncturing.
2Ease of operation
If the RNC assigns communication resources on conventional dedicated and common channels in a prior manner, then resource allocation is centralized and controlled, but the available bandwidth for E-DCH channels cannot be dynamically adjusted based on Node B reception capacity
Solution Approach 1:
The patent applies preliminary action by having the RNC pre-assign communication resources on conventional channels, then using the uplink channel quality feedback mechanism to dynamically adjust E-DCH bandwidth allocation based on actual Node B reception capacity and interference conditions.
Solution Approach 2:
The patent introduces dynamics by enabling continuous adjustment of E-DCH bandwidth allocation based on real-time uplink channel quality measurements. The system transitions from static RNC-assigned resources to dynamic Node B-controlled scheduling that adapts to changing reception conditions.
3Productivity
If the Node B controls E-DCH resources directly based on interference levels and reception capacity, then throughput optimization is improved, but coordination complexity increases in macrodiversity situations with multiple Node Bs
Solution Approach 1:
The patent applies universality by using a unified uplink channel quality feedback mechanism that serves multiple Node Bs simultaneously. Each Node B independently measures uplink channel quality and determines throughput limits, but all use the same feedback channel and coordination protocol, reducing overall system complexity.
Solution Approach 2:
The patent implements feedback by having UEs continuously report uplink channel quality measurements to Node Bs. This feedback loop enables each Node B to autonomously adjust E-DCH resource allocation based on actual reception conditions, simplifying coordination in macrodiversity scenarios compared to centralized control.
Data Source
AI summary
A base station (2a,2b,2c) which can communicate with radio terminals on common and dedicated channels according to specific speeds, is provided with a band-pass which is available according to the use of the common and dedicated channels in order to receive data from a radio terminal on a high-speed uplink channel. An available band-pass is determined in the base station in order to receive the data from at least one radio terminal (1) on at least one high-speed dedicated uplink channel. A first indication relating to the available band-pass is subsequently transmitted on a common downlink channel. At least one second indication relating to a percentage of the available band-pass which should not be exceeded by the radio terminal during a forthcoming transmission on said high-speed dedicated uplink channel is then transmitted independently for each radio terminal.