IDMA Interleaver Structure for Flexible Bit Sequence Lengths
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Solution Overview
Problem
Existing interleavers in IDMA systems increase the burden on terminal apparatuses and systems, reduce flexibility in data transmission, and can lead to memory shortages and delays, especially when the number of users increases, as they require transmitting and receiving interleavers, and often limit bit sequence lengths to powers of two.
Innovation Solution
An apparatus that acquires and processes information blocks with error correction coding, using interleavers unique to each user to interleave and de-interleave bit sequences into partial sequences of varying lengths, allowing for flexible transmission without the need to transmit interleavers, and using concatenated interleavers to achieve any desired bit sequence length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing interleavers (PRI, PI, HI, DI, LCI) are used in IDMA systems, then user-specific interleaving is achieved, but the burden on terminal apparatuses and systems increases
Solution Approach 1:
The patent extracts and eliminates the interleaver transmission requirement from the system. By using a predetermined interleaver generation rule known to both base station and terminal, the interleaver information is no longer transmitted over the air interface, directly reducing system burden and terminal processing complexity while maintaining user-specific interleaving capabilities
Solution Approach 2:
The patent implements a universal interleaver generation rule that can be applied to all users in the system. The base station and terminals use the same predetermined rule to generate interleavers locally, eliminating the need for separate interleaver transmission for each user while still providing user-specific interleaving through unique generation parameters
2Reliability
If interleavers are transmitted from base station to terminal, then correct de-interleaving is enabled, but memory requirements and radio resources increase
Solution Approach 1:
The patent removes the interleaver transmission component from the system architecture. Instead of transmitting interleaver data over radio resources and storing it in terminal memory, the interleaver is generated locally at both base station and terminal using a predetermined rule, eliminating the need for interleaver transmission and reducing memory requirements
Solution Approach 2:
The terminal apparatus is enabled to self-generate its interleaver using the predetermined rule and its own identification information, eliminating the need to receive and store interleaver data from the base station. This self-service approach reduces both radio resource consumption and terminal memory requirements
3Ease of manufacture
If fixed-length interleavers are used, then implementation is simplified, but flexibility in data transmission is reduced
Solution Approach 1:
The patent implements a dynamic interleaver length mechanism where the interleaver length is determined by the actual data length rather than being fixed. The predetermined generation rule adapts to different data lengths, allowing the interleaver to be as long as needed while maintaining implementation simplicity through the consistent generation algorithm
Solution Approach 2:
The patent changes the interleaver length parameter based on the data being transmitted. Instead of using a fixed interleaver length, the system adjusts the interleaver length to match the data length, providing transmission flexibility while maintaining implementation simplicity through the predetermined generation rule that handles variable lengths
4Reliability
If interleaver length is increased to reduce correlation between users, then BER/BLER performance improves, but system complexity increases
Solution Approach 1:
The patent extracts the interleaver management complexity from the system by eliminating the need for base station to generate, transmit, and manage interleavers for multiple users. The predetermined generation rule allows terminals to independently generate their own interleavers, reducing system complexity while maintaining long interleaver lengths for low correlation between users
Solution Approach 2:
The patent uses a copying approach where the predetermined interleaver generation rule is replicated at both base station and terminal apparatuses. This ensures both ends use the same rule to generate matching interleavers without requiring transmission of the actual interleaver data, maintaining performance while reducing complexity
Data Source
AI summary
There is provided an apparatus including an acquisition unit that acquires an information block generated from transmission data for a user and subjected to error correction coding, and an interleaving unit that interleaves a bit sequence of the information block using an interleaver unique to the user. The interleaving unit interleaves the bit sequence by interleaving each of two or more partial sequences obtained from the bit sequence.