Uplink Common Channel Resource Allocation for W-CDMA Load Balancing
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Solution Overview
Problem
In W-CDMA mobile communications systems, the uplink common channel experiences overload and quality degradation due to concentrated preamble transmissions from mobile stations, leading to frequent data transmission failures, especially at high transmission rates.
Innovation Solution
A resource allocation method that involves transmitting resource allocation information to mobile stations, allowing them to perform data transmission based on predetermined resource allocation profiles, thereby spreading data transmissions and maintaining uniform loads and stable quality on the common channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mobile stations perform preamble transmissions on the uplink common channel without dedicated channels, then mobile stations can transmit data using common channels, but the common channel experiences overload and quality degradation due to concentrated transmissions
Solution Approach 1:
The patent segments the common channel resources by introducing dedicated physical channels (DPCH) for specific mobile stations. This segmentation divides the overloaded common channel into dedicated resources, reducing concentration of transmissions and improving reliability while maintaining adaptability for mobile stations without dedicated channels.
Solution Approach 2:
The patent changes the resource allocation parameters by dynamically assigning dedicated physical channels based on transmission rates and channel conditions. This parameter change allows mobile stations to switch between common channel and dedicated channel resources, resolving the contradiction between versatility and reliability.
2Reliability
If resource allocation information is transmitted to mobile stations, then data transmissions are spread and uniform loads are maintained, but system complexity increases due to resource management overhead
Solution Approach 1:
The patent implements self-service mechanisms where mobile stations autonomously select preambles and determine transmission parameters based on received resource allocation information. This reduces base station complexity while maintaining reliable resource distribution across the network.
Solution Approach 2:
The patent uses preliminary action by pre-configuring resource allocation profiles and transmitting resource allocation information in advance before actual data transmissions occur. This allows mobile stations to prepare transmission parameters beforehand, simplifying real-time resource management while ensuring channel stability.
Data Source
AI summary
A resource allocation method and device are provided that can achieve uniform loads on and stable quality of a common channel available to mobile stations having no dedicated channels. A method for allocating common channel resources in a system in which a plurality of first radio communication devices transmit data to a second radio communication device over a common channel, based on first resource allocation information, includes: by the second radio communication device, transmitting second resource allocation information to at least one of the first radio communication devices; and by each of the first radio communication devices, transmitting data to the second radio communication device over the common channel, based on any one of the first resource allocation information and the second resource allocation information.