Joint Encoding of Channel Access Parameters for Uplink LBT
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Solution Overview
Problem
The shared channel occupancy time (COT) approach in wireless communication increases signaling overhead due to the need to convey multiple channel access parameters for listen-before-talk (LBT) procedures, especially in unlicensed frequency spectrum.
Innovation Solution
Joint encoding of channel access parameters, such as LBT procedure type, priorities, energy detection thresholds, and cyclic prefix extensions, minimizes signaling overhead by mapping different indices to combinations of parameter values, allowing for efficient transmission in shared COT contexts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple channel access parameters are individually signaled for LBT procedures in shared COT contexts, then the wireless device can accurately determine transmission parameters, but the signaling overhead increases
Solution Approach 1:
The patent combines multiple channel access parameters (LBT procedure type, priority, energy detection threshold, cyclic prefix extension) into a single unified indicator field in the downlink control information. This single field conveys all necessary parameter combinations, eliminating the need for separate signaling of each parameter and thereby reducing signaling overhead while maintaining complete parameter specification for accurate LBT procedure execution
Solution Approach 2:
The unified indicator field serves multiple functions simultaneously: it encodes LBT procedure type, priority level, energy detection threshold, and cyclic prefix extension requirements all in one signal element. This multi-functional approach allows the single indicator to replace what would otherwise require multiple separate signaling elements, directly addressing the overhead problem while preserving all necessary control information
2Loss of information
If channel access parameters are jointly encoded in a single field, then the signaling overhead is reduced, but the complexity of decoding and mapping increases
Solution Approach 1:
The patent pre-establishes a mapping relationship between the unified indicator field values and the corresponding combinations of channel access parameters before transmission occurs. This mapping is configured in advance through higher layer signaling or pre-defined in the specification, allowing the wireless device to simply look up the parameter combination corresponding to the received indicator value without performing complex real-time decoding or calculation, thus keeping implementation complexity manageable
Data Source
AI summary
A wireless device (30) receives control information (28) that jointly encodes respective values for two or more channel access parameters. The two or more channel access parameters govern performance by the wireless device (30) of a listen-before-talk, LBT, procedure prior to an uplink transmission (32) in a radio resource allocation (34). In some embodiments, a mapping (40) maps different indices to different combinations of values for the two or more channel access parameters. In this case, the control information (28) may comprise an index mapped by the mapping (40) to one of the different combinations of values for the two or more channel access parameters. Regardless, the wireless device (30) may perform the LBT procedure (or not) according to the received control information (28).