Terminal Two-Step Random Access Signaling with Separated Response Resources
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Solution Overview
Problem
The existing two-step random access procedure in wireless communication systems faces challenges in efficiently and reliably transmitting control information to multiple terminal apparatuses, particularly due to potential collisions in response signals and inefficient resource allocation.
Innovation Solution
A method where a base station apparatus multiplexes upper layer control information for multiple terminal apparatuses in a single physical packet, using different radio resources for response signals, and employs HARQ to ensure reliable transmission, with resource designation methods including separate PDCCHs or implicit designation based on multiplexing order.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If control information for multiple terminal apparatuses is transmitted in a multiplexed manner using a single signal, then transmission efficiency is improved, but the reliability of individual terminal reception deteriorates due to potential collisions and interference
Solution Approach 1:
The patent segments the control information transmission by allocating separate radio resources (time, frequency, or code domains) for response signals from different terminal apparatuses. This segmentation allows multiple terminals to receive and respond to control information simultaneously without collision, resolving the contradiction between multiplexed transmission efficiency and individual reception reliability.
Solution Approach 2:
The patent introduces an intermediary mechanism where the base station apparatus designates specific radio resources for response signals based on the multiplexed control information. This intermediary resource allocation acts as a mediator that ensures each terminal can reliably receive its designated control information while maintaining overall transmission efficiency through coordinated resource management.
2Reliability
If separate radio resources are allocated for response signals from different terminal apparatuses, then reception reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The patent applies preliminary action by having the base station apparatus pre-designate radio resources for response signals within the control information itself, before the actual response transmission occurs. This preliminary resource designation simplifies the allocation process by establishing a clear mapping between control information and response resources in advance, reducing the complexity of real-time resource management while ensuring reliable reception.
3Speed
If response signals from multiple terminal apparatuses are transmitted simultaneously, then communication speed is improved, but signal collisions increase reducing reliability
Solution Approach 1:
The patent resolves the collision issue by transitioning from a single-dimension simultaneous transmission to multi-dimensional resource allocation. Response signals from multiple terminals are separated across different time slots, frequency resources, or code sequences, allowing simultaneous communication without collision. This dimensional expansion maintains high communication speed while ensuring signal transmission reliability through orthogonal resource separation.
Data Source
AI summary
A terminal apparatus transmits a predetermined message to a base station apparatus based on a two-step random access procedure, upon receiving one signal that is transmitted from the base station apparatus in response to the predetermined message, and includes pieces of upper layer control information for the terminal apparatus and another terminal apparatus in a multiplexed manner, specifies a first radio resource for transmitting a first response signal indicating whether or not succeeded in receiving control information that is for the terminal apparatus and is included in the one signal, and is different from a second radio resource for transmitting a second response signal for the other terminal apparatus, based on at least one of a control signal that is used for transmitting the one signal and the one signal, and transmits the first response signal using the first radio resource.