HARQ Soft Buffer Handling in HS-SCCH-Less Retransmissions
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Solution Overview
Problem
In the HS-SCCH less operation of wireless communications systems, unnecessary data combination occurs when a user equipment (UE) sends an ACK but the Node-B does not receive it or decodes it as a NAK, leading to reduced transmission efficiency in HARQ operations due to combining retransmission data with successfully decoded data.
Innovation Solution
A method and apparatus that determine the decoding result of data stored in a first soft buffer and only combine retransmission data with the first soft buffer's data when it has not been successfully decoded, using specific rules to manage the first and second soft buffers, thereby avoiding unnecessary data combination and enhancing transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmission data is always combined with data in soft buffer, then decoding reliability is improved, but transmission efficiency deteriorates due to unnecessary combinations
Solution Approach 1:
The patent applies preliminary action by checking the decoding result of previously transmitted data before combining retransmission data with soft buffer data. The UE determines whether the previous data was successfully decoded in advance, and only performs combination when necessary (when decoding failed). This prevents unnecessary combination operations while ensuring reliability when needed.
2Loss of energy
If HS-SCCH is not transmitted with first HARQ transmission, then control channel overhead is reduced, but system complexity increases due to predefined control information management
Solution Approach 1:
The patent extracts the control information transmission from the first HARQ transmission by implementing HS-SCCH less operation. The control information is transmitted separately before the data transmission, allowing the first HARQ transmission to carry only data without control overhead. This separates control and data channels to reduce overall overhead while managing complexity through predefined rules.
Data Source
AI summary
A method of improving Hybrid Automatic Repeat Request operation for a user equipment operating in HS-SCCH less operation in a wireless communications system includes receiving a retransmission data in an HARQ procedure, determining a decoding result of data stored in a first soft buffer, combining the retransmission data with the data stored in the first soft buffer for generating a combined data when the UE determines that the data stored in the first soft buffer has not been successfully decoded, and performing a decoding process on the combined data and a store process corresponding to a second soft buffer. The first soft buffer is obtained by a first rule and the second soft buffer is obtained by a second rule.