Limited Buffer Rate-Matching Reference Value Determination
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Solution Overview
Problem
In wireless communications, particularly in the New Radio (NR) standard, there is a challenge in managing peak data rates and coded bit throughput due to limited buffer rate-matching, which can lead to hardware constraints and inefficiencies, especially during retransmissions and numerology switching, where the peak rate may need to be supported at lower code rates than the hardware supports.
Innovation Solution
A method is introduced to determine a reference value X, representing the largest index within a circular buffer for a transport block, which is used to compute data rates and manage encoding and decoding operations, allowing for more flexible and efficient processing without exceeding the coded bit peak rate, thereby accommodating decoding constraints and minimizing scheduler restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If limited buffer rate-matching is applied to limit coded bit throughput, then peak data rate is controlled, but the system cannot accommodate smaller TBS transmitted over smaller durations that yield peak rate at lower code rates
Solution Approach 1:
The patent introduces dynamic reference TBS determination where the reference transport block size is adaptively selected based on the actual TBS and transmission duration. The network node dynamically calculates whether to use a first reference TBS (for initial transmission) or a second reference TBS (for retransmission) based on the circular buffer index and transmission characteristics, allowing the rate-matching to adapt to different operational scenarios rather than using a fixed reference value
Solution Approach 2:
The patent changes the parameter used for rate-matching by introducing a reference circular buffer index that is determined based on the actual TBS and transmission duration. Instead of using a fixed reference TBS, the system dynamically determines a reference circular buffer index from the actual circular buffer index, effectively changing the reference parameter to match the actual transmission conditions and enabling proper rate-matching for smaller TBS over shorter durations
2Quantity of substance
If reference TBS is used for rate-matching, then coded bit buffer is limited, but the specification does not limit coded bit buffer for smaller TBS transmitted over smaller durations
Solution Approach 1:
The patent implements feedback mechanisms where the network node determines a reference circular buffer index based on the actual circular buffer index and transmission characteristics. This feedback loop ensures that the rate-matching is continuously adjusted based on the actual transmission conditions, maintaining reliable peak rate support across different code rates and transmission scenarios
Solution Approach 2:
The patent performs preliminary determination of the reference circular buffer index before the actual rate-matching operation. By pre-calculating the reference circular buffer index based on the actual TBS and transmission duration, the system prepares the rate-matching parameters in advance, ensuring that the coded bit buffer is properly limited before transmission occurs, thereby maintaining reliability for peak rate support at lower code rates
3Ease of operation
If fixed rate-matching is applied, then scheduler restrictions are minimized, but encoding and decoding operations cannot be clearly specified
Solution Approach 1:
The patent changes the parameter specification by introducing a reference circular buffer index that is dynamically determined based on the actual circular buffer index and transmission characteristics. This parameter change allows the system to maintain clear and unambiguous specification of encoding and decoding operations while adapting to different transmission scenarios, resolving the contradiction between ease of operation and device complexity
Data Source
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AI summary
Methods and apparatuses are disclosed for buffer rate-matching. In one embodiment, a method for a wireless device (WD) includes determining a reference value, the reference value indicating a largest index corresponding to a bit within a circular buffer for at least one code block of a transport block, the at least one code block having been selected for transmission of the transport block; determining a condition based on the reference value; and based on the condition, performing an action related to processing of one or more code blocks of the transport block.