Reserved Resource Pool Assisted Access for Small Data Transmission
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Solution Overview
Problem
In wireless communication systems, especially for 'Internet of Everything' (IOE) devices, the existing access request/grant mechanism for uplink communications is inefficient, leading to high power consumption and network interference, particularly for devices with low power resources and those located far from base stations, which increases the probability of collisions when selecting access resources from a common pool.
Innovation Solution
Implementing a grant-less transmission regime where IOE devices select access resources from a common pool and, if predicted metrics indicate a high likelihood of collision, request a second access resource from a reserved pool, reducing the probability of collisions without increasing search complexity for the base station by maintaining a smaller common pool and a larger reserved pool of access resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If IOE devices use grant-less transmission with a common pool of access resources, then energy efficiency is improved and access overhead is reduced, but the probability of collisions increases particularly for devices far from base stations
Solution Approach 1:
The access resource pool is segmented into two distinct pools: a common pool for initial access and a reserved pool for extended transmissions. This segmentation allows devices to first attempt access via the common pool (maintaining low energy consumption) and only transition to the reserved pool if collision risk is detected (improving reliability for distant devices).
Solution Approach 2:
The system dynamically changes transmission parameters based on predicted metrics. When collision probability exceeds a threshold, the device transitions from using common pool resources to reserved pool resources, effectively changing the resource allocation parameter to adapt to varying collision risks while maintaining overall system efficiency.
2Reliability
If the common pool of access resources is increased in size to reduce collision probability, then collision probability is reduced, but search complexity at the base station increases
Solution Approach 1:
The resource pool is divided into common and reserved segments with different sizes and purposes. The common pool remains relatively small to limit search complexity, while the reserved pool provides additional resources for high-risk scenarios. This segmentation resolves the contradiction by providing collision reduction capabilities without requiring a large common pool that would increase search complexity.
Solution Approach 2:
The base station pre-allocates and reserves specific resources in advance for potential extended transmissions, rather than dynamically searching for available resources during collisions. This preliminary action reduces the search complexity burden on the base station while ensuring resources are available when needed.
3Adaptability or versatility
If IOE devices located far from base stations use longer transmission times, then coverage is improved, but the probability of colliding with new transmissions from other devices increases
Solution Approach 1:
The transmission duration parameter is dynamically adjusted based on device location and channel conditions. Distant devices that require longer transmission times for adequate coverage are automatically transitioned to reserved pool resources, which have lower collision probability. This parameter change allows these devices to maintain extended transmission durations without proportionally increasing their collision risk.
Data Source
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AI summary
Wireless communications systems and methods related to the reduction in a probability of collision for grant-less transmissions from internet of everything (IOE) devices while not increasing search complexity at a base station are disclosed. A first wireless communications device includes a request for a reserved access resource from a reserved access pool into a first data transmission comprising a first set of data, in response to a metric exceeding a threshold. Then, the first wireless communications device transmits the first data transmission including the request to a second wireless communications device using a grant-less access resource from a common resource pool, the common resource pool being smaller than the reserved access pool. The first wireless communications device receives, from the second wireless communication device, a message identifying the reserved access resource, and transmits a second set of the data comprising a remaining amount of the data to the second wireless communications device using the reserved access resource.