Broadcast Parameter Message TDM Multiplexing
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Solution Overview
Problem
In the CDMA2000 1× Rev. D standard, receiving broadcast services encoded with Reed-Solomon (RS) codes is inefficient due to the need to receive all data frames, including undesired ones, which complicates RS decoding and distinguishes between services, leading to unnecessary data reception and decoding processes.
Innovation Solution
The method involves generating and transmitting a broadcast parameter message that indicates TDM multiplexing, position, and validity within sub-buffers, allowing terminals to selectively receive only necessary data by setting fields for TDM multiplexing, position, and actual service data, thereby enabling efficient RS decoding and increasing the number of TDM channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If TDM multiplexing is used to transmit multiple broadcast services, then channel utilization is improved, but receiving terminals must receive all data frames including undesired ones, increasing reception complexity and data volume
Solution Approach 1:
The patent segments the sub-buffer into multiple service data units, each associated with a specific broadcast service. By assigning unique identifiers to each service data unit, the receiving terminal can selectively receive only the desired service segments rather than processing all segments in the sub-buffer, thus reducing reception complexity while maintaining efficient channel utilization.
2Reliability
If RS code is applied as outer code for broadcast service, then error correction capability is improved, but receiving terminals must receive and decode all frames in the sub-buffer, increasing unnecessary data processing
Solution Approach 1:
The patent extracts the service identification information from the broadcast parameter message and uses it to filter out undesired service data frames before RS decoding. This extraction approach allows the terminal to apply RS code error correction only to the necessary frames containing the desired service, eliminating unnecessary decoding operations on frames carrying other services.
3Adaptability or versatility
If broadcast parameter message includes detailed service information, then service selection capability is improved, but message size increases, requiring more transmission resources
Solution Approach 1:
The patent implements local quality by providing detailed service information only when necessary for service differentiation. The broadcast parameter message includes service-specific fields such as service ID, service type, and quality of service parameters only when multiple services are present in the sub-buffer, keeping the message compact for single-service scenarios while enabling comprehensive service selection when needed.
Data Source
AI summary
A method and apparatus provide a broadcast parameter message in a mobile communication system providing a broadcast service. If the provided broadcast service is time domain multiplex (TDM)-multiplexed, a message generator generates the broadcast parameter message by setting a field indicating the TDM multiplexing, setting a field indicating a position of the broadcast service in each sub-buffer, setting a field indicating whether one sub-buffer includes one service and a field indicating validity of the field, and setting a field exclusively indicating actual broadcast service data stored in one sub-buffer. A transmitter modulates the broadcast parameter message and provides the modulated broadcast parameter message to a terminal that receives the broadcast service.