Base Station Receive Beam Sweeping for Random Access Latency
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Solution Overview
Problem
In wireless communications, particularly in 5G systems, the random access latency is increased due to the need for receive beam polling, where the base station sequentially traverses all beams to detect the random access preamble, leading to additional delay in establishing uplink synchronization and access.
Innovation Solution
Adjusting the sweeping parameter of the receive beam based on historical and handover information to optimize the beam sweeping process, such as increasing sweeping frequency, adding beams in new directions, or modifying beam widths, to reduce the latency introduced by beam sweeping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the base station sequentially traverses all beams to detect the random access preamble (beam polling), then the base station can receive the random access preamble from any direction, but the random access latency is increased due to the sequential scanning process
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple receive beams in different directions before the random access process begins. Instead of sequentially scanning beams starting from an arbitrary position, the base station has multiple beams ready to detect preambles simultaneously, reducing the time required to capture preambles from terminals in different locations.
Solution Approach 2:
The patent implements dynamics by making the beam selection adaptive based on terminal locations and movement patterns. The base station dynamically adjusts which receive beams are active and how they are configured based on historical data, current traffic conditions, and predicted terminal movements, rather than using a fixed sequential scanning approach.
2Ease of manufacture
If the base station uses a fixed beam polling pattern, then the beam sweeping process is simple to implement, but the random access latency cannot be optimized for different scenarios
Solution Approach 1:
The patent transforms the static beam polling pattern into a dynamic one by introducing adaptability based on terminal behavior. The system adjusts beam configurations, sweeping frequencies, and detection priorities based on historical data about terminal locations, movement patterns, and random access timing, thereby optimizing performance for different scenarios while maintaining implementation feasibility.
Solution Approach 2:
The patent applies parameter changes by modifying beam-related parameters such as beam directions, sweeping frequencies, and detection windows based on observed terminal patterns. Instead of using fixed parameters, the system adjusts these parameters dynamically to match actual terminal behavior, improving random access efficiency without overcomplicating the implementation.
3Reliability
If the base station increases the number of beams for receiving preambles, then the coverage and detection capability are improved, but the complexity of the beam management increases
Solution Approach 1:
The patent applies local quality by concentrating beam resources on directions and time periods where terminals are most likely to initiate random access. Instead of uniformly distributing beam resources across all possible directions and times, the system identifies high-probability regions based on historical data and allocates more beam resources locally to those areas, improving detection capability where needed while reducing complexity elsewhere.
Solution Approach 2:
The patent reduces beam management complexity through preliminary action by pre-configuring beams in directions where terminals are historically most active. This allows the system to have multiple beams ready in advance for high-probability directions without needing to dynamically manage all possible beam configurations, thereby improving detection capability while keeping management complexity manageable.
Data Source
AI summary
The present disclosure relates to random access methods, apparatus, and devices. One example method includes adjusting a sweeping parameter of a receive beam when at least one target receive beam is determined based on prior information, and sweeping the receive beam based on the adjusted sweeping parameter. The prior information includes at least one of cell historical information or cell handover information. The sweeping parameter includes at least one of a sweeping frequency, a sweeping sequence, a beam direction, or a beam width. The receive beam includes the at least one target receive beam. The receive beam is used to receive a random access preamble sent by a terminal. After a base station receives, on the receive beam, the random access preamble sent by the terminal, the terminal randomly accesses the base station for data communication.