CORESET #0 Resource Indication for Mixed-Bandwidth NR Access
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Solution Overview
Problem
In 5G New Radio (NR), UEs with relatively low communication speeds and small initial access bandwidths cannot determine Control Resource Set Zero (CORESET #0) when the bandwidth indicated by the base station exceeds their capabilities, leading to access failures and waste of communication resources due to repeated index broadcasting.
Innovation Solution
A method and apparatus for configuring and indicating different CORESET #0 resources to UEs with varying bandwidth capabilities, allowing both high and low bandwidth UEs to access the base station efficiently by using a single index, thereby reducing resource waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single bandwidth index is broadcast to all UEs, then resource broadcasting efficiency is improved, but low bandwidth UEs cannot determine CORESET #0 leading to access failure
Solution Approach 1:
The patent segments the bandwidth capability space into two groups: UEs with bandwidth less than the preset bandwidth and UEs with bandwidth greater than or equal to the preset bandwidth. Different CORESET #0 configurations are prepared for each segment, allowing the base station to broadcast a single index that maps to appropriate configurations for both segments through different determination methods.
Solution Approach 2:
The patent changes the parameter interpretation based on UE bandwidth capability. When the bandwidth capability is less than the preset bandwidth, the frequency domain resource index determines CORESET #0 within a limited range. When the bandwidth capability is greater than or equal to the preset bandwidth, the same index determines CORESET #0 in a broader range or with different mapping rules, enabling a single broadcast index to serve multiple UE types.
2Reliability
If different bandwidth indexes are broadcast for different UE types, then access success rate is improved, but communication resource waste increases due to repeated broadcasting
Solution Approach 1:
The patent makes a single frequency domain resource index universal by designing it to serve both low bandwidth and high bandwidth UEs simultaneously. The index is broadcast once in the MIB and can be interpreted differently by different UE types through their respective determination methods, eliminating the need for separate index broadcasts while ensuring access success for all UE categories.
3Productivity
If bandwidth indication is optimized for high bandwidth UEs, then high bandwidth access is improved, but low bandwidth UEs experience access failures
Solution Approach 1:
The patent introduces dynamic adaptability where the interpretation of the frequency domain resource index changes based on the UE's bandwidth capability. The system dynamically selects the appropriate determination method (first or second determination method) based on whether the UE supports bandwidth less than or greater than/equal to the preset bandwidth, allowing optimal resource indication for each UE type without compromising the other.
Data Source
AI summary
A method for indicating a resource is performed by a base station, and includes: configuring a first Control Resource Set Zero (CORESET #0) on a first time-frequency resource, and configuring a second CORESET #0 on a second time-frequency resource, in response to allowing a first terminal supporting a bandwidth greater than or equal to a preset bandwidth to access and allowing a second terminal supporting a bandwidth less than the preset bandwidth to access; and broadcasting a first index, to indicate the first time-frequency resource to the first terminal and to indicate the second time-frequency resource to the second terminal.