Node B Autonomous HS-DSCH Code Allocation
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Solution Overview
Problem
The existing WCDMA-based wireless communication systems using HSDPA have inefficiencies in radio resource management, as the node B is not able to autonomously utilize unused HS-DSCH channelisation codes, leading to underutilization of radio resources and increased signalling overhead between the RNC and node B.
Innovation Solution
A method where the node B autonomously allocates unused HS-DSCH channelisation codes for servicing user equipment, identifying and utilizing the extended HS-DSCH code set to enhance resource efficiency without requiring frequent interventions from the RNC, thereby reducing signalling overhead and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the RNC explicitly signals all available HS-DSCH channelisation codes to the node B, then the node B can service user equipments with sufficient codes, but the signalling overhead between RNC and node B increases
Solution Approach 1:
The patent divides the total N HS-DSCH channelisation codes into two segments: a minimum code set (M codes) that is explicitly signaled by the RNC to the node B, and an extended code set (N-M codes) that the node B can autonomously identify and allocate. This segmentation reduces the signaling overhead from transmitting all N codes to only transmitting M codes, while still ensuring sufficient code availability for user equipment service.
2Productivity
If the node B autonomously allocates unused HS-DSCH channelisation codes, then the radio resource utilization increases, but the complexity of code management at the node B increases
Solution Approach 1:
The patent enables the node B to autonomously identify and allocate unused HS-DSCH channelisation codes without continuous intervention from the RNC. The node B monitors the usage status of codes in the extended code set and automatically allocates unused codes to user equipment, thereby improving radio resource utilization while maintaining manageable complexity through standardized procedures.
3Loss of information
If the RNC frequently updates the HS-DSCH code set allocation, then the node B has accurate code availability information, but the signalling frequency and overhead increase
Solution Approach 1:
The patent establishes a minimum HS-DSCH code set (M codes) in advance that is explicitly signaled by the RNC to the node B. This preliminary allocation ensures the node B always has sufficient codes for user equipment service without requiring frequent updates. The RNC only needs to update the minimum code set when necessary, reducing signaling frequency while maintaining code availability accuracy.
Data Source
AI summary
A method for allocating HS-DSCH channelization codes in WCDMA based wireless communication system using HSDPA in which a total number of N HS-DSCH channelization codes are available. M<N HS-DSCH channelization codes are allocated upon request by a RNC such that a node B can service UE's. The node B identifies which of the HS-DSCH channelization codes are currently unused for transmissions and autonomously allocates at least one of the unused HS-DSCH channelization codes for servicing UE's.