Uplink Transmission Control via Dynamic RACH Resource Scheduling
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Solution Overview
Problem
In dynamic TDD environments, statically or semi-statically configured RACH resources can become unavailable for random access, leading to failed access requests and interference with downlink data transmissions, as they are dynamically adjusted for uplink/downlink transmission direction changes, affecting the availability of uplink resources in cells.
Innovation Solution
The network device explicitly or implicitly indicates dynamic scheduling information of RACH resources via control signaling, allowing UEs to select available RACH resources for random access, ensuring normal access and reducing interference by dynamically adjusting RACH resource configurations based on control signaling feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RACH resources are statically or semi-statically configured, then random access can proceed normally, but the RACH resources may become unavailable when dynamically adjusted into downlink transmissions, causing access failures and interference
Solution Approach 1:
The patent applies dynamics by enabling the RACH resource configuration to adapt dynamically to changing TDD configurations. The network device determines whether RACH resources are available based on the current TDD configuration and dynamically adjusts or indicates unavailability to UEs, allowing the system to balance between random access reliability and dynamic configuration flexibility.
Solution Approach 2:
The patent implements feedback by having the network device monitor the TDD configuration state and provide indications to UEs about RACH resource availability. This feedback mechanism allows UEs to adjust their random access behavior based on current network conditions, resolving the contradiction between maintaining reliable access and adapting to dynamic configurations.
2Productivity
If RACH resources are dynamically adjusted to match uplink/downlink transmission directions, then resource utilization efficiency improves, but random access requests may fail when resources are adjusted into downlink transmissions
Solution Approach 1:
The patent applies preliminary action by having the network device determine RACH resource availability in advance before UEs attempt random access. By proactively identifying and indicating unavailable resources based on upcoming TDD configurations, the system prevents access failures before they occur while maintaining efficient resource utilization through dynamic adjustment.
3Adaptability or versatility
If UEs transmit random access requests on dynamically adjusted resources, then resource flexibility is maximized, but interference with downlink data transmissions occurs when uplink transmission interferes with other UEs receiving downlink data
Solution Approach 1:
The patent applies preliminary anti-action by having the network device identify and mark RACH resources as unavailable before UEs can transmit on them. By preemptively preventing transmissions on resources that would cause interference with downlink transmissions, the system maintains resource flexibility while eliminating harmful interference effects.
Data Source
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AI summary
An uplink transmission control method and apparatus and a communication system. The network device explicitly or implicitly indicates dynamic scheduling information of RACH resources via control signaling. After selecting RACH resources, the user equipment (UE) monitors control signaling corresponding to the RACH resources. According to situations of receiving the control signaling, when the selected RACH resources are available, the UE directly transmits a random access request matched with the RACH resources; and when the selected RACH resources are unavailable, the UE further selects RACH resources according to configuration or indication of a base station, and until an RACH resource is available, the UE transmits a random access request matched with the RACH resource. Hence, normal random access of the UE may be ensured, and interference to other UEs may be reduced.