Dynamic User Sequence Space Adjustment for Massive MTC Collision Reduction
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Solution Overview
Problem
In massive machine-type communication scenarios, the existing user sequence space design in cellular mobile communications systems is inadequate, leading to increased collision probabilities due to limited sequence lengths and inflexible resource allocation, which affects system performance and efficiency.
Innovation Solution
A method for dynamically adjusting the size of the user sequence space by sending signaling information from a network device to terminal devices, allowing for flexible specification of the number of user sequences, enabling quasi-orthogonal or orthogonal sequences, and adapting based on network load and system parameters to optimize user detection and communication parameter estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed and small user sequence space is designed for MBB service, then device complexity is reduced and ease of operation is improved, but collision probability increases significantly in massive MTC scenarios
Solution Approach 1:
The patent implements dynamic adjustment of user sequence space size through signaling from the base station to terminal devices. The base station can flexibly configure the quantity of user sequences based on network conditions and service requirements, allowing the system to adapt between MBB and massive MTC scenarios. This resolves the contradiction by making the sequence space size variable rather than fixed, enabling high reliability in massive MTC while maintaining ease of operation in MBB scenarios.
Solution Approach 2:
The patent changes the parameter of user sequence space size from a fixed protocol-defined value to a dynamically configurable parameter. By introducing signaling mechanisms that allow the base station to indicate the quantity of user sequences to terminal devices, the system can adjust this parameter according to the service scenario, thereby reducing collision probability in massive MTC while maintaining simplicity in MBB scenarios.
2Reliability
If the user sequence space size is increased to reduce collision probability, then reliability improves, but additional time-frequency resources are required
Solution Approach 1:
The patent enables dynamic allocation of user sequence space size based on actual network needs. The base station configures the quantity of user sequences through signaling only when necessary, allowing the system to expand the sequence space for massive MTC to reduce collisions while maintaining resource efficiency in MBB scenarios where expansion is not needed. This dynamic approach resolves the resource consumption issue.
Solution Approach 2:
The patent introduces configurable parameters for user sequence space size that can be adjusted without permanently allocating additional time-frequency resources. By using signaling to indicate the quantity of user sequences, the system can virtually expand the sequence space through parameter configuration rather than physical resource allocation, thereby reducing collision probability without proportionally increasing resource consumption.
3Measurement precision
If orthogonal user sequences are used, then user detection accuracy is improved, but the user sequence space size is limited by sequence length
Solution Approach 1:
The patent implements dynamic configuration of user sequence space size while maintaining orthogonality properties. The base station can adjust the quantity of user sequences based on detection accuracy requirements and network conditions, allowing the system to optimize between detection precision and sequence space size adaptively. This resolves the contradiction by making the sequence space configurable rather than fixed by sequence length constraints.
Solution Approach 2:
The patent changes the approach from fixed orthogonal sequences limited by length to dynamically configurable sequence spaces. By introducing signaling mechanisms that allow flexible specification of user sequence quantities, the system can maintain orthogonality for accurate detection while adapting the sequence space size to match actual network requirements, thereby resolving the limitation imposed by fixed sequence lengths.
Data Source
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AI summary
This application discloses a user sequence transmission method, a network device, and a terminal device. The method includes: sending, by a network device, first signaling to a terminal device, where the first signaling includes first information used to indicate a quantity of user sequences in a first user sequence space, and the user sequences in the first user sequence space include a universal set of user sequences used by the terminal device served by the network device; receiving, by the network device, a first user sequence sent by the terminal device based on the first information; and performing, by the network device, user detection and/or communication parameter estimation based on the first user sequence. Therefore, in the method provided in this application, the network device may flexibly specify a size of a user sequence space that can be used by all terminal devices served by the network device, so that the size of the user sequence space can be adjusted, thereby improving accuracy of user detection or communication parameter estimation, and improving work efficiency of a system.