Uplink Scrambling for Random Access Interference Reduction
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Solution Overview
Problem
In mobile communication systems, especially during random access procedures, mobile stations face challenges in scrambling uplink signals, leading to potential interference with neighboring cells, as the radio base station cannot specify the mobile station transmitting the signal, and uplink interference increases when scrambling is not performed.
Innovation Solution
A method and apparatus that enable mobile stations to perform scrambling processing on uplink signals before being specified by the radio base station, by transmitting a random access preamble, assigning an uplink resource, notifying the resource through a random access response signal, and using an uplink scrambling sequence for transmission, with the radio base station performing descrambling processing using corresponding sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the mobile station transmits the uplink signal before being specified by the radio base station during random access procedure, then the communication initiation process can be completed, but the mobile station cannot perform proper scrambling processing which causes uplink interference to neighboring cells
Solution Approach 1:
The patent applies preliminary action by having the mobile station perform scrambling processing in advance before the radio base station completes the specification process. The mobile station uses a default or preliminary scrambling sequence that is assigned before full identification, allowing the uplink signal to be transmitted with proper scrambling from the beginning of the random access procedure, thus preventing interference while enabling communication initiation.
2Device complexity
If the mobile station does not perform scrambling processing on the uplink signal during random access, then the transmission process is simplified, but uplink interference to neighboring cells increases
Solution Approach 1:
The patent applies self-service by enabling the mobile station to autonomously perform scrambling processing using a default scrambling sequence that is pre-configured or assigned independently of the complete identification process. This allows the mobile station to self-manage the scrambling function during random access without requiring continuous control from the radio base station, thereby reducing overall system complexity while preventing uplink interference.
3Reliability
If the radio base station waits until specifying the mobile station before allowing uplink signal transmission, then proper identification is ensured, but the communication establishment time is extended
Solution Approach 1:
The patent applies preliminary action by allowing the mobile station to perform scrambling processing and transmit uplink signals during the random access procedure before the radio base station completes the full specification process. The mobile station uses a preliminary or default scrambling sequence that is assigned early in the process, enabling parallel execution of identification and signal transmission operations, thus reducing communication establishment time while maintaining identification accuracy through subsequent confirmation steps.
Data Source
AI summary
A radio base station apparatus (10) according to the present invention includes: an uplink resource assignor unit (13) configured to assign an uplink resource to a mobile station (01) in response to a random access signal which the mobile station (01) transmits by use of a random access preamble; a random access response signal transmitter unit (14) configured to notify the mobile station (01) of the uplink resource by using a random access response signal; and an uplink scramble decoder unit (16) configured to perform descrambling processing on an uplink signal transmitted from the mobile station (01) by use of the uplink resource, by using an uplink scrambling sequence corresponding to the uplink resource.