ACK/NACK/SR Resource Mapping for Dynamic TDD Systems
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Solution Overview
Problem
In TDD systems, especially in dynamic environments with varying uplink-downlink service requirements, existing techniques face challenges in managing ACK/NACK/SR resources, leading to conflicts between users with different protocol versions, such as R11 and low version users, due to static or semi-static configuration and complex signaling procedures.
Innovation Solution
The proposed method involves dynamically allocating ACK/NACK/SR resources for terminals using different protocols by reserving specific areas for each protocol version, using a predefined rule to determine resource indices and start points, ensuring that resources do not overlap, and informing terminals of their respective resource allocations via higher layer signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic uplink-downlink configuration is implemented to adapt to changing service requirements, then system adaptability is improved, but resource allocation complexity increases due to protocol version conflicts
Solution Approach 1:
The patent segments the ACK/NACK/SR resource space into distinct regions for different protocol versions. Specifically, it divides resources into those allocated according to TDD uplink-downlink configuration and those allocated according to HARQ timing, allowing R11 and earlier version users to operate in separate resource domains, thereby eliminating conflicts while maintaining dynamic configuration capability
Solution Approach 2:
The patent introduces a resource separation mechanism as an intermediary layer between dynamic TDD configuration and HARQ timing requirements. This intermediary resource allocation strategy prevents direct interaction between conflicting protocol version requirements, enabling dynamic adaptation without version conflicts
2Productivity
If ACK/NACK/SR resources are allocated dynamically to support protocol version diversity, then system performance is improved, but resource conflict occurs between different protocol versions
Solution Approach 1:
The patent segments the ACK/NACK/SR resource space into distinct regions for different protocol versions. Specifically, it divides resources into those allocated according to TDD uplink-downlink configuration and those allocated according to HARQ timing, allowing R11 and earlier version users to operate in separate resource domains, thereby eliminating conflicts while maintaining dynamic configuration capability
Solution Approach 2:
The patent applies different resource allocation strategies to different protocol version groups. R11 users receive resources allocated based on TDD configuration, while earlier version users receive resources allocated based on HARQ timing. This localized quality differentiation ensures each protocol version operates with optimized, conflict-free resources
3Device complexity
If static uplink-downlink slot ratio is used to simplify configuration, then device complexity is reduced, but adaptability to dynamic service requirements deteriorates
Solution Approach 1:
The patent implements dynamic uplink-downlink configuration where the slot ratio can be adjusted in real-time based on service requirements. The base station can dynamically change the TDD configuration, and the resource allocation method adapts accordingly by segmenting resources based on the new configuration, maintaining both simplicity and adaptability
Data Source
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AI summary
Examples of the present disclosure provide an ACK/NACK/SR resource mapping method and an apparatus. According to the technical solution provided by the examples of the present disclosure, in a system including a terminal utilizing a first type protocol and a terminal utilizing a second type protocol, the base station allocates the ACK/NACK/SR resources corresponding to the second type protocol in an area outside of the ACK/NACK/SR resource area reserved for the terminal utilizing the first type protocol, and informs the terminal utilizing the second type protocol of the allocation information of the corresponding ACK/NACK/SR resources. Thus, the terminal utilizing the second type protocol may transmit feedback information via the corresponding ACK/NACK/SR resources. In a dynamic system, conflict between ACK/NACK/SR resources of terminals utilizing different types of protocols can be avoided, especially conflict between ACK/NACK/SR resources of R11 and/or following version users and low version users.