Wireless Communication Fixed Channel Selection for DRS Transmission
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Solution Overview
Problem
In a multi-cell wireless communication scenario, network side devices often struggle to send Discovery Reference Signals (DRS) due to channel congestion, leading to reduced access efficiency for user terminals and impaired data transmission.
Innovation Solution
A wireless communication method where a network side device determines multiple fixed channels based on preconfigured frequencies, selects one or more channels to send DRS, and performs data transmission with user terminals through frequency hopping on channels other than the fixed channels, using Listen Before Talk (LBT) technology to assess channel availability and optimize DRS sending opportunities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fixed channel is used for DRS transmission, then channel access is simplified, but the probability of successful DRS transmission decreases due to channel congestion in multi-cell scenarios
Solution Approach 1:
The patent divides the single fixed channel into multiple fixed channels (first fixed channel, second fixed channel, etc.). Each network side device is assigned to use one or more of these channels for DRS transmission. This segmentation increases the total number of available channels, thereby reducing channel congestion and collision probability while maintaining relatively simple access procedures.
Solution Approach 2:
The patent changes the parameter of channel quantity from one to multiple (N≥2). By configuring multiple fixed channels with different frequency offsets, the system increases channel resources available for DRS transmission. Network side devices can select from multiple channels based on their cell IDs and configured offsets, thereby improving transmission success rate without significantly increasing access complexity.
2Productivity
If multiple network side devices use the same fixed channel for DRS transmission, then channel resource utilization is improved, but channel collision increases and access efficiency decreases
Solution Approach 1:
The patent assigns different local qualities (different frequency offsets) to different network side devices. Each device calculates its specific fixed channel based on its cell ID and a configured offset, creating a unique or semi-unique channel assignment. This local differentiation reduces collisions while maintaining overall channel resource utilization across the network.
Solution Approach 2:
The patent introduces dynamic channel selection based on cell IDs and configured offsets. Instead of all devices using a static single channel, each device dynamically determines its appropriate channel from the set of N fixed channels. This dynamic assignment reduces collisions and transmission delays while maintaining efficient channel utilization.
3Reliability
If channel detection is performed multiple times before DRS transmission, then channel availability is better assessed, but transmission delay increases for network side devices
Solution Approach 1:
The patent performs channel availability assessment in advance by configuring multiple fixed channels before actual DRS transmission. Network side devices can pre-determine their assigned channels based on cell IDs and configured offsets, so when transmission time arrives, they can quickly assess and transmit without extensive repeated detection. This preliminary configuration reduces preparation time while maintaining reliable channel assessment.
Data Source
AI summary
A method includes determining, by a network side device, N fixed channels. The method further includes determining, by the network side device, a first fixed channel from the N fixed channels, sending, by the network side device, a discovery reference signal on the first fixed channel, and performing data transmission on a data channel through frequency hopping. The data channel includes a channel other than the N fixed channels. N is an integer greater than or equal to 2.