Contention Channel Data Transmission Using Transmit Identifier Segmentation
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Solution Overview
Problem
Conventional contention-based radio channels face challenges in reducing latency and energy consumption while maintaining spectral efficiency, particularly in scenarios requiring soft-combining of data transmissions, as they often rely on bidirectional negotiation and scheduling grants, which can lead to increased latency and prevent soft-combining due to the inability to determine the transmitting UE.
Innovation Solution
A method where a wireless device obtains a transmit identifier from a set of identifiers, includes this identifier in the control information, and transmits data, allowing the base station to detect and combine transmissions from multiple stations without sacrificing spectral efficiency, by using pseudo-random numbers or hash values to generate unique identifiers for each station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a CRC value scrambled with station identifier is included in control information for contention-based access, then the receiving station can identify the transmitting station, but the number of CRC attempts and false associations increase as station density increases
Solution Approach 1:
The patent divides the identification function into two separate components: a transmit identifier (TI-RNTI) for initial detection and association in control information, and a station identifier (C-RNTI) for final identification. This segmentation allows the receiving station to process control information with fewer attempts using the TI-RNTI, while maintaining accurate station identification through the separate C-RNTI field in the data payload.
Solution Approach 2:
The patent introduces a transmit identifier (TI-RNTI) as an intermediary element that facilitates initial association between the receiving station and transmitting station without requiring the full station identifier. This intermediary reduces the computational burden by enabling quick filtering and association before final identification, thereby improving processing efficiency while maintaining identification accuracy.
2Measurement precision
If the station identifier is included explicitly in control information, then the receiving station can identify the transmitting station, but spectral efficiency is reduced
Solution Approach 1:
The patent segments the identification information into two parts: a compact transmit identifier (TI-RNTI) placed in the control information, and the full station identifier (C-RNTI) placed in the data payload. This segmentation allows the control information to remain concise (preserving spectral efficiency) while still enabling accurate station identification through the combination of both identifiers.
Solution Approach 2:
The patent moves the full station identifier from the control information dimension to the data payload dimension. By placing the C-RNTI in the data portion rather than the control portion, the patent maintains spectral efficiency in control signaling while ensuring accurate station identification is achieved through the multi-dimensional approach of using both TI-RNTI and C-RNTI together.
3Reliability
If bidirectional negotiation and scheduling grants are used in contention-based access, then reliable data transmission is achieved, but latency and energy consumption increase
Solution Approach 1:
The patent performs preliminary actions by pre-configuring the transmit identifier (TI-RNTI) and establishing the association between the UE and base station before actual data transmission begins. This preliminary setup eliminates the need for bidirectional negotiation during the transmission phase, allowing the UE to transmit data immediately using the pre-established TI-RNTI, thereby reducing latency while maintaining reliability through the pre-configured identification mechanism.
Solution Approach 2:
The patent enables the UE to autonomously select and use a TI-RNTI from a predefined set without requiring scheduling grants or negotiation with the base station. This self-service approach allows the UE to independently access the contention-based channel, eliminating the need for grant-based coordination and significantly reducing transmission latency while maintaining reliable identification through the self-selected TI-RNTI.
Data Source
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AI summary
A technique for transmitting data (504) from a first station to a second station on a contention-based radio channel is described. As to a method aspect of the technique, the first station obtains a transmit identifier (506) for the first station from a set of transmit identifiers; transmits control information (502) including the transmit identifier (506) to the second station; and transmits the data (504) to the second station according to the control information (502), wherein the data includes a station identifier (508) for the first station, the station identifier (508) or a combination of the station identifier and the transmit identifier (506) being indicative of the first station.