Random Access Using SBFD Resources to Cut Uplink Delay
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Solution Overview
Problem
In TDD communication systems, the limited number of uplink resources due to increased downlink resources leads to uplink access delays for user equipment (UE), resulting in poor user experience and failure to meet service continuity requirements during random access.
Innovation Solution
Implementing a random access method that utilizes sub-band full-duplex (SBFD) resources, allowing simultaneous uplink and downlink data transmission, and selecting valid RO resources for preamble reporting to increase the number of available uplink resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If more downlink resources are configured to improve network throughput, then downlink capacity is improved, but uplink resources become fewer leading to increased uplink access delay
Solution Approach 1:
The patent introduces sub-band full-duplex (SBFD) resources as a new dimension in resource allocation, allowing simultaneous uplink and downlink transmission in the same time slot but different frequency sub-bands. This transforms the traditional time-division resource structure into a frequency-division full-duplex structure, effectively creating additional uplink resources without reducing downlink capacity.
Solution Approach 2:
The patent enables certain time slots to serve dual purposes by configuring them as SBFD resources that can simultaneously support both uplink and downlink transmissions. This multi-functionality allows the same time resource to contribute to both uplink access and downlink data transmission, resolving the trade-off between the two.
2Device complexity
If traditional half-duplex mode is used with strict time division between uplink and downlink, then implementation simplicity is maintained, but uplink resources are limited when downlink resources are increased
Solution Approach 1:
The patent segments the frequency band into multiple sub-bands, allowing different sub-bands to be allocated for uplink and downlink transmissions simultaneously within the same time slot. This segmentation enables the system to increase uplink resource quantity by utilizing previously underutilized frequency resources without significantly increasing overall system complexity.
Data Source
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AI summary
Examples of the present disclosure provide a random access method and apparatus, a base station, and UE, which relate to the field of communication technology. The method is applied to the base station, comprising: receiving a preamble reported by the UE on a valid RO resource, wherein the valid RO resource is selected from all of RO resources by the UE, and there is a first RO resource overlapping with an SBFD resource in all of the RO resources; sending a RA response to the UE based on the preamble, so that the UE randomly access the base station through CBRA or CFRA. The solution provided by the examples of the present disclosure can be applied to reduce an uplink access delay of the UE, thereby improving the user experience of the UE and meeting the performance requirements for service continuity.