Node B HARQ Process Reallocation via Parameter Update
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Solution Overview
Problem
In HSUPA systems, the Node B lacks the ability to efficiently manage HARQ processes due to limitations in reallocating reserved HARQ processes, leading to inefficient hardware resource management and spectral inefficiency.
Innovation Solution
A method is introduced where the Node B initiates a RL PARAMETER UPDATE INDICATION message to the SRNC for re-allocating HARQ processes, including HARQ process allocations for 2ms non-scheduled and scheduled transmissions, allowing for dynamic re-allocation of HARQ processes through new information elements in RNSAP/NBAP signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the Node B reserves HARQ processes for NST, then the Node B can manage HARQ processes based on local hardware resource knowledge, but the Node B cannot re-allocate the reserved HARQ processes efficiently
Solution Approach 1:
The patent introduces dynamic re-allocation of HARQ processes by enabling the Node B to send RL PARAMETER UPDATE INDICATION messages to the SRNC when re-allocation is needed. This transforms the static HARQ process reservation into a dynamic system where processes can be re-assigned based on changing hardware resource conditions, resolving the contradiction between initial allocation flexibility and subsequent management efficiency.
2Loss of time
If the SRNC controls HARQ process reservation, then Iub/Iur signaling is simpler and fewer delays occur, but the SRNC lacks knowledge of available hardware resources at the Node B
Solution Approach 1:
The patent uses the RL PARAMETER UPDATE INDICATION message as an intermediary mechanism that allows the Node B to communicate hardware resource status and re-allocation needs to the SRNC. This intermediary enables the SRNC to make informed decisions about HARQ process re-allocation without requiring the SRNC to have direct knowledge of hardware resources, thus resolving the information loss while maintaining signaling efficiency.
3Ease of manufacture
If the Node B cannot re-allocate HARQ processes except through serving cell change or new NST connection, then the current architecture is simpler to implement, but hardware resources are not managed efficiently
Solution Approach 1:
The patent changes the parameter control mechanism by introducing the RL PARAMETER UPDATE INDICATION message that allows dynamic modification of HARQ process allocation parameters. This enables the system to transition from a static parameter configuration to a dynamic one, improving spectral efficiency while maintaining implementation simplicity through the use of existing signaling frameworks.
Data Source
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AI summary
A method, apparatus, and computer program for re-allocating a hybrid automatic repeat request HARQ process is described where a Node B initiates HARQ re-allocation by sending to a radio network controller RNC a RL PARAMETER UPDATE INDICATION message that includes at least one of a HARQ process allocation for 2 ms non-scheduled transmission NST GRANT information element IE and a HARQ process allocation for 2 ms scheduled transmission ST GRANT IE indicating a value for HARQ process re-allocation. The Node B then receives from the RNC a RL RECONFIGURATION PREPARE or REQUEST message that contains the NST or ST GRANT IE. Responsive to receiving the RL RECONFIGURATION PREPARE or REQUEST message, the Node B sends to the RNC a RL RECONFIGURATION READY or RESPONSE message, then receives from the RNC a RL RECONFIGURATION COMMIT message. Responsive to the COMMIT message, the Node B re-allocates the HARQ process according to the RL RECONFIGURATION PREPARE or REQUEST message.