Uplink Interlace Allocation for Shared Spectrum Collision Avoidance
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently configuring uplink channel transmissions over shared radio frequency spectrum bands, particularly in ensuring effective bandwidth occupancy and minimizing collisions with other devices, especially in unlicensed bands.
Innovation Solution
The configuration involves allocating uplink resources into interlaces of resource blocks, demultiplexing data streams, and mapping them onto resource elements using techniques like SC-FDMA or OFDMA, with additional processing steps such as discrete Fourier transforms and spreading to optimize transmission across the shared spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple devices transmit simultaneously in shared radio frequency spectrum band, then data transmission capacity is improved, but collision likelihood increases
Solution Approach 1:
The patent implements Listen Before Talk (LBT) procedure where devices perform Clear Channel Assessment (CCA) before transmitting. This preliminary action detects whether the channel is occupied by other transmissions, allowing the device to defer its transmission if the channel is busy, thereby preventing collisions while enabling multiple devices to access the shared spectrum efficiently
2Reliability
If channel access procedures are performed frequently to avoid collisions, then collision likelihood is reduced, but channel access time increases
Solution Approach 1:
The patent implements periodic Clear Channel Assessment (CCA) procedures at defined intervals and synchronized CCA opportunities where multiple devices perform channel sensing simultaneously. This periodic approach balances collision avoidance with efficient channel access by establishing regular assessment points rather than continuous or ad-hoc sensing, reducing unnecessary delays
3Ease of operation
If synchronized CCA procedures are implemented across multiple base stations and UEs, then channel access coordination is improved, but system complexity increases
Solution Approach 1:
The patent implements autonomous CCA procedures where each User Equipment (UE) and base station independently performs Clear Channel Assessment based on pre-configured parameters and synchronization signals. Devices self-manage their channel access decisions using local measurements and predefined rules, eliminating the need for complex centralized coordination while achieving synchronized operation through common reference signals and timing structures
Data Source
AI summary
Techniques for wireless communications over a shared radio frequency spectrum band, may include techniques for transmitting uplink data transmissions using allocated uplink resources. Allocated uplink resources may include an uplink channel comprising a number of allocated interlaces of resource blocks (RBs) for use by a user equipment (UE). An incoming data stream may be processed and data separated into each of the allocated interlaces of RBs for the UE. Such separation may be through demultiplexing the data stream to obtain data for the allocated interlaces of RBs. The demultiplexed data may be mapped onto associated resource elements associated with the allocated interlaces of RBs, and transmitted. Different types of uplink channels, such as a physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH) and/or a physical random access channel (PRACH) may be allocated to interlaces of RBs in one or more subframes of a transmitted radio frame.