Base Station Transceiver Allocation for Downlink Delay Diversity
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Solution Overview
Problem
Current wireless communication networks require twice as many transmitters and antennas to implement downlink transmit delay diversity (TDD) due to the need for each call to be handled by two transmitters, limiting their capacity and resource efficiency.
Innovation Solution
A method and apparatus that utilize a combination of simplex and duplex transceivers in base stations, where only those transceivers implementing downlink TDD are used when necessary, allowing for efficient allocation and reallocation of resources based on the need for TDD during call setup and handovers, reducing the overall number of transceivers required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink transmit delay diversity (TDD) is implemented using traditional methods with two transmitters per call, then signal reception reliability is improved, but the number of transceivers required increases significantly
Solution Approach 1:
The system segments transceivers into two distinct types: simplex transceivers (S-TRX) that do not implement downlink TDD and duplex transceivers (D-TRX) that do implement TDD. This segmentation allows the network to selectively deploy TDD capability only where needed, rather than requiring all transceivers to have full TDD functionality, thereby reducing the total number of transceivers required while maintaining signal reception reliability for users needing diversity.
Solution Approach 2:
The system dynamically allocates calls to either simplex or duplex transceivers based on real-time evaluation of downlink parameters. During call setup and handover, the system evaluates signal conditions and determines whether TDD is needed, then dynamically assigns the appropriate transceiver type. This dynamic allocation optimizes resource usage by deploying TDD functionality only when signal reception reliability requires it, rather than statically provisioning all transceivers with TDD capability.
2Reliability
If downlink TDD is implemented for all calls, then signal reception is improved for users in null regions, but resource efficiency and network capacity decrease
Solution Approach 1:
The system applies different transceiver configurations to different spatial locations and user conditions. Simplex transceivers serve users with adequate signal reception, while duplex transceivers with TDD serve users in null regions or with poor signal conditions. This local quality differentiation ensures that TDD resources are concentrated where they provide the most benefit, improving overall network capacity while maintaining signal reception for users who need it.
Solution Approach 2:
Instead of applying TDD universally to all calls (excessive action), the system applies TDD partially only to calls that evaluate it as needed based on downlink parameter thresholds. This partial application of TDD avoids the resource overhead of universal TDD deployment while still providing signal reception improvement for users who actually require it, thereby optimizing network capacity.
3Reliability
If twice as many transmitters are allocated for TDD, then each call receives diverse signal paths, but the complexity of transceiver management increases
Solution Approach 1:
Duplex transceivers are designed to perform multiple functions: they can operate with downlink TDD enabled when needed and without TDD when not needed. This multi-functionality allows a single transceiver type to replace what would otherwise require two separate transceiver types, simplifying management by reducing the variety of transceiver configurations that must be tracked and managed while still providing signal reception diversity where required.
Data Source
AI summary
A method and apparatus for providing downlink transmit delay diversity (TDD). In accordance with the invention, a BTS includes at least one simplex transceiver (S-TRX) that does not implement downlink TDD and at least one duplex transceiver (D-TRX) that does implement TDD. In accordance with the preferred embodiment, the BTS has “N” S-TRXs and “A” D-TRXs, where N and A are positive integers and A is less than N. When downlink TDD is implemented, a total of N+A transceivers may be used (i.e., N S-TRXs and A D-TRXs). When downlink TDD is not needed, as many as N S-TRXs may be used. When downlink TDD is not needed, typically no D-TRXs are used. Therefore, the present invention reduces the amount of resources that is required to implement downlink TDD. In addition, the present invention efficiently utilizes resources by preferably implementing downlink TDD only when it is needed.