Wireless Communication Node Buffer Management for NTN Latency
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Solution Overview
Problem
In wireless communication systems with large transmission latency, such as Non-Terrestrial Networks (NTN), the limited buffer capability of user equipment (UE) poses a challenge due to increased requirements for Hybrid Automatic Repeat Request (HARQ) processes and Transmission Time Interval (TTI) length, which complicates data transmission and rate guarantee.
Innovation Solution
A method where only X1 bits from a bit block are used to generate a radio signal, allowing X2 bits to be used for decoding upon channel failure, with signaling transmitted through the air interface to determine buffer usage and resource allocation, reducing the need for soft bit buffering and enhancing dynamic sharing between HARQ processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of HARQ processes or the length of TTI is increased to guarantee data rate in networks with large transmission latency, then the data rate is improved, but the buffer capability requirement of UE increases
Solution Approach 1:
The patent segments the buffer requirement by introducing soft bit flushing mechanism. Instead of requiring the UE to maintain a large buffer for all HARQ processes simultaneously, the system allows flushing of soft bits after successful decoding, effectively dividing the buffer usage across time rather than requiring all buffers to be available concurrently. This resolves the contradiction by reducing the peak buffer capability requirement while maintaining the ability to support multiple HARQ processes for improved data rate.
Solution Approach 2:
The patent implements dynamic buffer management through the soft bit flushing mechanism. The buffer usage is no longer static but dynamically adjusted based on decoding success. When decoding succeeds, soft bits are flushed; when decoding fails, soft bits are retained for combining. This dynamic approach allows the system to achieve improved data rate through multiple HARQ processes while reducing the average buffer capability requirement compared to static buffer allocation.
2Productivity
If the number of HARQ processes or the length of TTI is increased to guarantee data rate in networks with large transmission latency, then the data rate is improved, but the complexity of UE increases
Solution Approach 1:
The patent extracts the complex buffer management function from the UE by introducing network-side assistance through first information signaling. The network indicates whether soft bits should be flushed or retained, effectively moving the decision-making complexity from the UE to the network side. This allows the UE to maintain simpler buffer management logic while still benefiting from improved data rate through multiple HARQ processes.
Solution Approach 2:
The patent implements a feedback mechanism where the network provides first information to the UE about buffer management decisions. This feedback loop allows the UE to adjust its buffer usage behavior based on network instructions, reducing the complexity at the UE end while maintaining the capability to support multiple HARQ processes for improved data rate performance.
3Quantity of substance
If soft bit buffering is reduced to lower buffer requirements, then the buffer capability and complexity are reduced, but the link performance may deteriorate
Solution Approach 1:
The patent changes the parameter of soft bit retention strategy from a static UE-side decision to a dynamic network-controlled parameter. By using first information to indicate whether to flush or retain soft bits, the system optimizes the balance between buffer capability and link performance. This parameter change allows the system to reduce buffer requirements while maintaining link performance through network-coordinated soft bit management.
Solution Approach 2:
The patent introduces network-side signaling (first information) as an intermediary between the buffer management decision and the UE execution. This intermediary mechanism allows the network to coordinate soft bit flushing/retention decisions with overall link performance requirements, enabling reduced buffer capability at the UE while maintaining acceptable link performance through centralized coordination.
Data Source
AI summary
The disclosure provides a method and a device in a communication node for wireless communications. The communication node first receives first information and then receives a first radio signal; only X1 bit(s) in a first bit block is(are) used for generating the first radio signal, the first bit block is obtained as an output of channel coding of a first code block, the first code block includes a positive integer number of bit(s), and the first bit block includes a positive integer number of bit(s); when channel decoding fails, at least X2 bit(s) in the first bit block can be used for decoding of the first code block with combining, the first information is used for determining the X2 bit(s), and the X2 is a positive integer. The disclosure reduces requirements on a buffer and reduces complexity.