OFDM Resource Allocation for RedCap Receiver Processing Limits
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Solution Overview
Problem
Existing radio communication systems face challenges in efficiently utilizing computational resources and power consumption while facilitating coexistence with other radio protocols, particularly for Reduced Capability (RedCap) 5G devices, which have limited processing capabilities.
Innovation Solution
A method is introduced where a transmitter reserves and allocates time-frequency resource units for data channels while reserving others for legacy or different protocol signals, ensuring the number of resource units allocated exceeds the receiver's processing limit, thereby optimizing data transfer rates without exceeding processing constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of time-frequency resource units allocated for data channel exceeds the receiver's processing limit N, then the data transfer rate is improved, but the receiver cannot process all allocated resources
Solution Approach 1:
The allocated set of R time-frequency resource units is segmented into two groups: M units that are also in the reserved set (handled separately) and R-M units that are exclusively for the data channel. This segmentation allows the receiver to process only R-M units while the system achieves higher overall data transfer rate by utilizing all R allocated units through coordinated transmission and reservation information.
2Adaptability or versatility
If time-frequency resource units are reserved for legacy signals and other protocols, then coexistence with other radio protocols is improved, but the number of available resource units for data channel is reduced
Solution Approach 1:
The transmitter performs preliminary reservation of M time-frequency resource units in the reserved set before allocating the full set of R units for the data channel. By transmitting reservation information to the receiver in advance, the system enables the receiver to understand which units are reserved for legacy signals and other protocols, allowing efficient resource utilization while maintaining protocol coexistence.
3Productivity
If the receiver processes more resource units than its design limit N, then the data transfer rate increases, but the computational resources and power consumption are exceeded
Solution Approach 1:
The transmitter transmits reservation information to the receiver, providing feedback about which time-frequency resource units are reserved and which are allocated for data channel. This feedback mechanism enables the receiver to adjust its processing to handle exactly R-M units (where R is total allocated and M is reserved), optimizing the data transfer rate while keeping computational resources and power consumption within acceptable limits.
Data Source
AI summary
A radio transmitter is configured to operate in accordance with a first predetermined OFDM radio protocol. The transmitter reserves, within a timeslot with a predetermined timeslot duration, a reserved set of time-frequency resource units not available for an OFDM data channel defined by the first protocol. The transmitter allocates, within the timeslot, an allocated set of R time-frequency resource units for the OFDM data channel defined by the first protocol, wherein a number M of time-frequency resource units are included in both the allocated set and the reserved set, wherein the value R is such that R>N and R−M≤N, where N is a predetermined maximum number of time-frequency resource units that can be used to carry the data channel. The transmitter then transmits data indicative of the allocated set of R time-frequency resource units and data indicative of the reserved set of time-frequency resource units.