Uplink Group Grant for Two-Step Random Access
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Solution Overview
Problem
Current two-step random access procedures in wireless communication systems face inefficiencies in spectral efficiency, power consumption, and signaling overhead due to the design of uplink grants, which do not effectively support multiple UEs sharing resources or providing additional uplink data without explicit requests.
Innovation Solution
Incorporating an uplink group grant in both success and fallback random access responses, allowing multiple UEs to share time-frequency resources and modulation and coding schemes, reducing the need for individual grants and explicit resource requests, thereby enhancing spectral efficiency and reducing power consumption and signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual uplink grants are provided for each UE in random access response, then each UE can be addressed individually, but signaling overhead increases and spectral efficiency decreases
Solution Approach 1:
The patent merges multiple individual uplink grants into a single uplink group grant that can be shared by multiple UEs. The group grant includes resource allocation information that can be applied by multiple UEs simultaneously, reducing the number of separate grant signals needed while maintaining individual UE service capability through UE-specific parameters within the group structure.
Solution Approach 2:
The uplink group grant is designed to serve multiple functions: it can be received by multiple UEs simultaneously, applied by different UEs for different transmissions, and configured with UE-specific parameters. This universal grant structure eliminates the need for separate dedicated grants for each UE while preserving individualized service through configurable parameters.
2Productivity
If uplink group grant is provided in random access response, then spectral efficiency improves and power consumption reduces, but UE must determine if grant is intended for itself
Solution Approach 1:
The group grant incorporates UE-specific parameters such as a first identifier associated with the UE, first resource allocation information specific to the UE, and first modulation and coding scheme. These localized parameters within the universal group grant structure enable each UE to identify whether the grant is intended for it while maintaining the efficiency benefits of shared resources.
3Productivity
If explicit resource requests are required from UE, then resource allocation can be optimized, but procedure complexity increases and time is consumed
Solution Approach 1:
The base station performs preliminary action by proactively including uplink group grant information in the random access response before the UE needs to transmit additional data. This preliminary provision of resource allocation information eliminates the need for separate explicit resource requests from the UE, reducing procedure time while maintaining optimized resource allocation through base station-based scheduling.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. A user equipment (UE) may transmit a random access message including a preamble and a payload. A base station may detect the preamble of the random access message. The base station, and may fail or succeed to decode the payload of the random access message. The base station may transmit, based at least in part on detecting the preamble and the different decoding outcome for the payload, a random access response. The random access response may include an uplink group grant and an indication for a type of the uplink group grant for a plurality of UEs whose preamble transmission share the same time and frequency occasion. UEs may monitor the type and the contents of the uplink group grant and transmit data subsequently on a set of shared time frequency resources. Numerous other aspects are provided.