Power Offset Determination in HSUPA MAC-e PDU Processing
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Solution Overview
Problem
In High Speed Uplink Packet Access (HSUPA) systems, the NodeB's inability to correctly decode received MAC-e PDUs due to poor channel quality leads to inaccurate determination of Power Offset (PO), affecting transmission power calculation and overall system performance.
Innovation Solution
Configuring a Power Offset (PO) corresponding to an information element constituting a MAC-e PDU for both the UE and NodeB, allowing them to determine the PO based on predefined rules, thereby avoiding the need for NodeB to decode the MAC-e PDU and ensuring consistent PO values for MAC-e PDUs using the same resource type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the NodeB decodes the received MAC-e PDU to determine the Power Offset, then the PO can be determined based on actual transmitted data, but the decoding fails under poor channel quality leading to inaccurate PO determination
Solution Approach 1:
The patent applies preliminary action by pre-configuring Power Offset values for different MAC-d flows before data transmission occurs. The NodeB and UE both have pre-stored PO tables that map MAC-d flow identifiers to their corresponding Power Offset values. This allows the NodeB to determine the PO directly from the MAC-e PDU header without needing to successfully decode the entire PDU payload, thereby avoiding decoding failures under poor channel conditions while maintaining accurate PO determination.
2Productivity
If the UE calculates transmission power using the Power Offset, then the power control can be performed, but frequent changes in MAC-d flow priorities cause frequent PO changes affecting stability
Solution Approach 1:
The patent applies preliminary action by pre-configuring Power Offset values for different MAC-d flows before data transmission occurs. The NodeB and UE both have pre-stored PO tables that map MAC-d flow identifiers to their corresponding Power Offset values. This allows the NodeB to determine the PO directly from the MAC-e PDU header without needing to successfully decode the entire PDU payload, thereby avoiding decoding failures under poor channel conditions while maintaining accurate PO determination.
3Adaptability or versatility
If the NodeB determines PO by decoding MAC-e PDU, then the system can adapt to actual transmitted data, but the complexity of decoding increases processing time
Solution Approach 1:
The patent applies the extraction principle by extracting only the necessary information (MAC-d flow identifier) from the MAC-e PDU header, which is already transmitted regardless of decoding success. The NodeB uses this extracted identifier to look up the corresponding Power Offset value from pre-configured tables, eliminating the need for complete PDU decoding. This maintains adaptability to actual transmitted data while significantly reducing processing time and avoiding decoding failures under poor channel conditions.
Data Source
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AI summary
A method for determining a Power Offset (PO) is disclosed. The method includes: configuring a PO corresponding to an information element for a NodeB and a UE; the UE and the NodeB determines a PO for a currently transmitted MAC-e PDU according to an information element constituting the MAC-e PDU, the PO configured and a predefined PO determining rule. A system, a UE and a NodeB for determining PO are also disclosed. According to the present invention, when MAC-d flows carrying a service to be transmitted at the UE are not changed, the PO corresponding to any MAC-e PDU which is transmitted at any time and uses the same type of resource as the above MAC-e PDU will not change. Thus, the NodeB needs not to decode a received MAC-e PDU to determine the PO corresponding to the MAC-e PDU, which improves power control performance of the NodeB.