Wireless Message Retransmission Based on Block Size
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Solution Overview
Problem
In wireless telecommunication systems, autonomous transmissions by mobile units can cause interference and rise-over-thermal issues, especially with the introduction of enhanced dedicated channels and reduced frame sizes in future generations, which may require higher data transmission rates and powers, potentially exceeding what mobile units can support without causing unacceptable interference.
Innovation Solution
A method is introduced where the number of retransmissions and transmission power for messages are determined based on the block size, with messages having a block size equal to or below a minimum transport block size being retransmitted multiple times at lower power and those above being transmitted once at higher power, to manage interference and power requirements effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If autonomous transmissions are performed at higher bit rates to support reduced frame sizes (e.g., 2 ms TTI), then data transmission rate is improved, but transmission power increases causing higher interference and rise-over-thermal
Solution Approach 1:
The patent implements dynamic adaptation of transmission parameters by determining the number of retransmissions based on the block size of the message. For smaller block sizes (e.g., 480 bits), more retransmissions are allowed, enabling the use of lower data rates and reduced transmission power. For larger block sizes, fewer retransmissions are permitted, requiring higher data rates but with correspondingly higher power control. This dynamic adjustment resolves the contradiction by matching transmission characteristics to message requirements.
Solution Approach 2:
The patent changes the parameter of transmission power and data rate based on the message block size. By establishing a relationship between block size and maximum allowed retransmissions, the system adjusts transmission parameters adaptively. Smaller messages use lower power and lower data rates with more retransmission opportunities, while larger messages use higher power and higher data rates with fewer retransmissions, thus managing interference while supporting reduced frame sizes.
2Object-generated harmful factors
If transmission power is limited to control rise-over-thermal, then interference is reduced, but the ability to support reduced frame sizes (2 ms TTI) is compromised
Solution Approach 1:
The patent segments the transmission process into multiple retransmission attempts, with the number of segments determined by the message block size. For small messages (480 bits), up to 10 retransmissions are permitted, allowing the use of lower transmission power per attempt while still achieving reliable delivery. This segmentation approach enables the system to support reduced frame sizes without requiring continuously high transmission power, thus controlling rise-over-thermal while maintaining productivity.
3Reliability
If more retransmissions are allowed for smaller block sizes, then successful decoding is improved, but effective data transport rate decreases
Solution Approach 1:
The patent applies parameter changes by adjusting the number of retransmissions based on message block size. For small messages (480 bits), the system allows up to 10 retransmissions to ensure reliable decoding, accepting a lower effective data transport rate. For large messages (2400 bits), only 1 retransmission is allowed, maintaining higher effective data transport rate. This parameter adaptation resolves the contradiction by matching reliability requirements to message characteristics.
Data Source
AI summary
The present invention provides a method of wireless telecommunication of a message having a block size. The method includes determining a number of retransmissions of the message based upon the block size.