Wireless Relay Station Pre-Encoding Signal Processing
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Solution Overview
Problem
Conventional wireless communication systems face limitations in increasing system capacity gain without adding time resources, particularly in relaying methods like TDD, coded bi-directional, and multi-user SDMA, which consume excessive resources and have limitations in maximizing overall system capacity.
Innovation Solution
The method involves pre-encoding transmission signals with channel information and transmitting them to a Relay Station (RS) using the same time resources, allowing the RS to detect and relay signals by eliminating noise, thereby improving capacity gain without requiring additional time resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional TDD relaying is used, then link performance of MSs is improved, but time resources are excessive (four independent time resources required)
Solution Approach 1:
The patent merges bidirectional communication into a single time resource by having the BS and MS simultaneously transmit signals to the RS in the same time slot. The RS receives both downlink and uplink signals concurrently, eliminating the need for separate time resources for each direction, thus reducing time resource consumption from four slots to two slots while maintaining link performance.
Solution Approach 2:
The patent enables continuous useful action by allowing the RS to receive signals from both BS and MS in every time resource without idle periods. The RS continuously processes and relays signals in both downlink and uplink directions within the same time framework, maximizing resource utilization and eliminating wasted time slots.
2Loss of time
If coded bi-directional relaying is used, then time resources are reduced (three independent time resources), but system capacity gain is not maximized
Solution Approach 1:
The patent further reduces time resources from three to two slots by merging the third time resource used in coded bi-directional relaying into the existing two-time-resource framework. The RS performs signal processing and relay functions within these two time resources, achieving both time efficiency and maximum system capacity gain by optimizing the use of each resource slot.
3Loss of time
If multi-user SDMA relaying is used, then time resources are optimized (two independent time resources), but device complexity increases due to multi-user detection scheme
Solution Approach 1:
The patent extracts and eliminates the complex multi-user detection scheme from the RS by using pre-encoding at the BS and MS. The signals are pre-processed before transmission, allowing the RS to simply relay the combined signal without performing complex detection, thus reducing device complexity while maintaining the two-time-resource efficiency.
Solution Approach 2:
The patent applies preliminary action by pre-encoding transmission signals at the BS and MS before they reach the RS. This pre-processing prepares the signals in advance, allowing the RS to handle them with simpler processing requirements, thereby reducing the complexity of the relay station while maintaining optimal time resource utilization.
4Area of stationary object
If relay scheme is implemented, then service coverage is expanded, but resource consumption increases
Solution Approach 1:
The patent merges multiple communication functions into the relay scheme, allowing the RS to handle both downlink and uplink traffic for multiple MSs within the same service area using only two time resources. This consolidated approach expands service coverage to multiple users simultaneously while minimizing time resource consumption compared to conventional methods that require separate resources for each user or direction.
Data Source
AI summary
An apparatus and method for supporting relaying in a wireless communication system are provided. The apparatus and method include a transmitting apparatus which acquires channel information between the transmitting apparatus and an RS, pre-encodes a transmission signal to be transmitted to the RS with the channel information, transmits the pre-coded signal to the RS, and acquires, upon receipt of a signal from the RS, a signal transmitted by a receiving apparatus by eliminating the transmission signal transmitted to the RS from the received signal. Accordingly, the apparatus and method improve system capacity gain without adding time resources.