Random Access Parameter Selection for Cross Band Pairing
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Solution Overview
Problem
Wireless communication systems face challenges in performing random access procedures across different frequency bands, particularly in cross band downlink/uplink pairings, due to varying signal attenuation and device capabilities, leading to difficulties in establishing reliable connections.
Innovation Solution
A base station transmits two sets of random access parameters in a cross band pairing deployment, allowing user equipment (UE) to autonomously select the appropriate band for the random access procedure based on its capabilities and environmental metrics, ensuring reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cross band pairing is implemented to support both mmW and sub-6 GHz bands, then adaptability and communication flexibility are improved, but device complexity and access procedure difficulty increase
Solution Approach 1:
The base station segments the random access parameters into separate sets for different frequency bands (mmW band parameters and sub-6 GHz band parameters). Each set contains band-specific configuration information, allowing UEs to selectively apply parameters appropriate to their capabilities and the selected band, thereby managing complexity through structured organization
Solution Approach 2:
The base station performs preliminary action by broadcasting multiple sets of random access parameters in advance through system information blocks before the UE needs to perform random access. This allows the UE to have all necessary parameters available autonomously without requiring additional interactive configuration, reducing access procedure complexity
2Reliability
If random access parameters are broadcast for both bands, then access reliability is improved, but information transmission overhead increases
Solution Approach 1:
The broadcast message structure is designed with universal applicability, where a single system information block contains multiple sets of random access parameters that can serve different UE types and different frequency bands. This multi-functional broadcast approach ensures all UEs can find their required parameters without requiring separate broadcasts for each band or UE type
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. A user equipment (UE) may receive, from a base station, a broadcast message comprising a first set of random access parameters for a first uplink band supported by the base station and a second set of random access parameters associated with a second uplink band supported by the base station. The UE may select one of the first set of random access parameters or the second set of random access parameters for a random access signal. The UE may transmit a random access signal over one of the first uplink band or the second uplink band using the selected one of the first set of random access parameters or the second set of random access parameters.