Random Access Preamble and CCCH SDU Transmission via MAC Subheader Indicators
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Solution Overview
Problem
In wireless communication systems, there is a challenge in efficiently managing uplink and downlink data and control information due to limited resources, particularly in reducing latency to enhance performance in applications sensitive to delay.
Innovation Solution
A method for performing a random access procedure in a wireless communication system involving the transmission of a random access preamble on a physical random access channel and a common control channel service data unit on a physical uplink shared channel, with a medium access control protocol data unit containing a subheader that includes indicators for RAP identity and backoff, allowing for efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional random access procedure is used, then communication can be established, but latency is high and resource utilization is inefficient
Solution Approach 1:
The patent combines the random access preamble transmission and CCCH SDU transmission into a single uplink message (MsgA), eliminating the need for separate transmissions. This merging reduces the number of communication steps and associated latency, while improving resource utilization by transmitting control information and access signaling simultaneously rather than sequentially.
Solution Approach 2:
The patent enables the UE to transmit both the random access preamble and the CCCH SDU (containing uplink data or control information) in advance as a single combined message. This preliminary action allows the base station to receive both access signaling and user data simultaneously, reducing overall procedure latency and improving resource efficiency compared to traditional sequential transmission.
2Productivity
If separate transmission of RAP and CCCH SDU is performed, then resource allocation is simple, but communication efficiency is reduced and latency increases
Solution Approach 1:
The patent segments the MAC PDU into distinct subheaders: a first subheader for the random access preamble and a second subheader for the CCCH SDU. This segmentation allows the base station to efficiently parse and process different types of information separately while maintaining the benefits of combined transmission, thus improving communication efficiency without excessive complexity.
Solution Approach 2:
The patent introduces dynamic indicator fields within the MAC subheader that can indicate the presence or absence of specific elements (such as backoff indicator or RAP identity). This dynamic structure allows the MAC PDU to adapt its format based on actual transmission needs, improving communication efficiency while managing complexity through conditional inclusion of elements rather than fixed structure.
3Loss of information
If MAC PDU includes all possible fields, then information completeness is ensured, but overhead increases and resource efficiency decreases
Solution Approach 1:
The patent employs dynamic indicator fields in the MAC subheader that signal whether specific elements (such as backoff indicator or RAP identity) are present in the current transmission. This dynamic approach ensures information completeness by including only necessary elements based on actual transmission requirements, thereby reducing MAC PDU overhead and improving resource efficiency compared to always including all possible fields.
Data Source
AI summary
In the present disclosure, a UE transmits a random access preamble (RAP) on a physical random access channel (PRACH) and a control channel (CCCH) service data unit (SDU) on a physical uplink shared channel (PUSCH); and receives a medium access control (MAC) protocol data unit (PDU) based on transmitting the RAP and the CCCH SDU. The MAC PDU includes a MAC subheader. The MAC subheader includes a first indicator field regarding whether the MAC subheader include an RAP identity (ID) or not. The MAC subheader further includes a second indicator field regarding whether the MAC subheader includes a backoff indicator field or not, based on the first indicator field set to a value indicating that the MAC subheader does not include an RAP ID.