MAC-PDU Format Checking for Immediate Wireless Retransmission
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Solution Overview
Problem
In wireless communication systems, particularly in 3G and beyond, the existing protocols face inefficiencies in data retransmission due to delayed retransmission requests when MAC-PDU formats are incorrect, leading to decreased throughput.
Innovation Solution
Implementing a wireless communication apparatus with a receiving section that uses a data check bit for error determination and a retransmission asking section to immediately request retransmission when the data format is incorrect, and embedding retransmission requests with reception time and antenna identification information in communication control information for MIMO communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the existing 3G protocol is used for data transmission, then communication coverage and basic connectivity are achieved, but retransmission requests are delayed when MAC-PDU formats are incorrect, leading to decreased throughput
Solution Approach 1:
The patent applies preliminary action by performing format determination of MAC-PDUs before they are processed by higher layers. The format determination is performed at the MAC layer itself, not waiting for upper layer processing to reveal format errors. This early detection enables immediate retransmission requests without delay, resolving the contradiction between maintaining productivity and avoiding time loss.
Solution Approach 2:
The patent implements feedback by having the MAC entity determine the format of received MAC-PDUs and immediately generate retransmission requests when format errors are detected. This feedback mechanism operates at the MAC layer, providing rapid detection and correction information back to the transmitting side, thereby improving throughput while minimizing time loss from delayed retransmission requests.
2Productivity
If format determination is performed at the MAC layer, then immediate retransmission requests can be made, but the complexity of the MAC entity increases
Solution Approach 1:
The patent applies universality by having the MAC entity perform multiple functions: it not only handles conventional MAC protocols but also integrates format determination capabilities. The MAC entity serves both as a protocol controller and as a format validator, eliminating the need for separate complex format checking modules while still achieving rapid retransmission requests.
Solution Approach 2:
The patent merges the format determination function into the existing MAC entity structure. Rather than adding a separate complex format checking system, the format determination is combined with the MAC protocol processing, allowing the MAC entity to simultaneously handle protocol control and format validation, thus improving productivity without proportionally increasing device complexity.
3Reliability
If retransmission requests are made for all format errors, then data integrity is improved, but unnecessary traffic increases when errors are transient
Solution Approach 1:
The patent applies partial action by selectively requesting retransmission only when format determination indicates actual errors that affect data integrity. The MAC entity determines whether retransmission is necessary based on the format determination results, avoiding unnecessary retransmission requests for transient or non-critical format issues, thus improving reliability while reducing unnecessary traffic.
Data Source
AI summary
A wireless communication apparatus that uses a communication protocol to transmit and receive data with a data check bit, including a received data determining section that performs a data check for received data by using the data check bit to determine whether the data is error; a received result transmitting section that, when determined to be error, discards the data and transmits a retransmission request to other wireless communication apparatus of the transmitting origin, whereas determined to be not error, transmits a message indicating that the data is normal to the other wireless communication apparatus of the transmitting origin; and a retransmission asking section that determines whether a format of the data is incorrect or normal, and when determined to be normal, passes the data to predetermined processing, whereas when determined to be incorrect, discards the data and asks the received result transmitting section to request retransmission of the data.