Unlicensed Band Resource Allocation via Preliminary LBT
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Solution Overview
Problem
Existing resource allocation schemes for cellular communication in unlicensed bands face issues such as increased delay and signaling load due to listen before talk (LBT) failures, inaccuracy in channel measurement, non-continuous radio resource use, and delayed CQI reporting, which affect the efficiency and reliability of communication.
Innovation Solution
A method for allocating resources in a cellular network using an unlicensed band, which involves generating and transmitting resource assignment signals indicating consecutive uplink subframes, allowing for efficient use of frequency bands and minimizing losses by adapting to LBT successes and failures, and optimizing channel measurement and reporting processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing resource allocation schemes are used in unlicensed bands, then resource allocation can be performed, but delay increases and signaling load increases due to LBT failures
Solution Approach 1:
The patent performs preliminary Listen Before Talk (LBT) checks before allocating uplink resources to user equipment. By checking channel availability in advance and only allocating resources when the channel is confirmed available, the system avoids subsequent transmission failures and retransmission delays, thus reducing overall communication delay while maintaining reliability
Solution Approach 2:
The patent dynamically adjusts resource allocation based on real-time LBT results. When LBT succeeds, resources are allocated; when LBT fails, resource allocation is deferred or adjusted. This dynamic adaptation to changing channel conditions prevents wasted transmissions and optimizes the balance between reliability and delay
2Reliability
If existing resource allocation schemes are used in unlicensed bands, then resource allocation can be performed, but signaling load increases
Solution Approach 1:
The patent extracts and separates the LBT check function from the standard resource allocation procedure. By performing LBT checks independently before resource allocation and only proceeding when successful, the system eliminates unnecessary signaling exchanges that would occur with failed allocations, thereby reducing overall signaling load while maintaining reliability
3Adaptability or versatility
If channel measurement is performed in shared bands, then resource allocation can be adapted, but measurement accuracy decreases
Solution Approach 1:
The patent performs channel measurements and LBT checks preliminarily before final resource allocation decisions. By measuring channel conditions in advance and only proceeding with allocations when conditions are favorable, the system obtains more accurate measurements under stable conditions while maintaining the ability to adapt to changing channel states
4Reliability
If CQI reporting is performed in unlicensed bands, then link adaptation can be achieved, but reporting delay increases
Solution Approach 1:
The patent dynamically adjusts CQI reporting timing and frequency based on LBT success and channel conditions. When channel conditions are stable and LBT succeeds, CQI reporting proceeds at normal intervals for accurate link adaptation. When LBT fails or conditions are unstable, reporting is deferred or adjusted, preventing delayed or lost reports while maintaining adaptation reliability
Data Source
AI summary
Disclosed is a 5G or pre-5G communication system provided so as to support a data transmission rate higher than that of a 4G communication system, such as LTE. A method and a device for transmitting information in a communication system are disclosed. The method for allocating resources in a cellular network using an unlicensed band comprises the steps of: generating at least one resource allocation signal containing information indicating a plurality of continuous uplink subframes capable of communicating through the unlicensed band; transmitting the resource allocation signal to a user equipment (UE) through the unlicensed band for the duration of at least one downlink subframe; and receiving uplink data from the UE for the duration of the continuous uplink subframes.