Relay Station Wireless Access Control for WiMAX Coverage
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Solution Overview
Problem
WiMAX systems face limited coverage and reduced user data throughput in urban areas and shadowing regions due to high spectrum usage and complex wireless environments, with existing solutions being costly and ineffective for indoor coverage.
Innovation Solution
Integration of a relay station into the wireless access network to receive and forward uplink and downlink bearer data and control information between subscriber stations and base stations, maintaining centralized control and scheduling at the base station to enhance coverage and throughput without additional latency or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the density of base stations is increased to improve coverage area, then coverage area is improved, but device cost and network wiring cost increase
Solution Approach 1:
A relay station is introduced as an intermediary device between the base station and subscriber stations. The relay station receives signals from the base station and forwards them to subscriber stations in coverage areas that are difficult to reach directly, thereby extending the coverage area without requiring additional base stations and their associated high infrastructure costs.
Solution Approach 2:
The patent introduces a hierarchical network structure with multiple levels: base stations at the core level and relay stations at the extended level. This dimensional expansion of the network architecture allows coverage to be extended outward from the base station through relay nodes, effectively increasing coverage area without linearly increasing infrastructure investment.
2Area of stationary object
If relay station is introduced to extend coverage area, then coverage area and link budget are improved, but system complexity increases
Solution Approach 1:
The network is segmented into distinct functional components: base stations that provide core network connectivity and relay stations that provide extended coverage. This segmentation allows each component to have simplified, specialized functions - base stations handle complex network management while relay stations perform simpler signal forwarding operations, thereby managing overall system complexity.
Solution Approach 2:
The relay station acts as a transparent intermediary that simplifies the system architecture by handling only signal reception and forwarding between base stations and subscriber stations. This intermediary role avoids the need for complex intelligence at the relay level, keeping the relay station design simple while still achieving coverage extension.
3Area of stationary object
If relay station forwards all information including control information, then coverage is extended, but transmission latency increases
Solution Approach 1:
Control information is extracted from the relayed traffic stream and transmitted directly from the base station to the subscriber station via a separate control channel. This separation ensures that control signaling does not undergo the additional relay forwarding delay, thereby minimizing transmission latency for time-sensitive control operations while still allowing data traffic to benefit from relayed coverage extension.
Data Source
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AI summary
The present invention provides a wireless access control method, relay station and base station. The wireless access control method according to the present invention is characterized in that under the control of said base station, information of said subscriber station and said base station is received and forwarded via a wireless channel by using the relay station. Said method further comprises the steps of: uplink bearer data and control information from said subscriber station being first received by said relay station and then forwarded to said base station; downlink bearer data from said base station being first received by said relay station and then forwarded to said subscriber station. Said base station sends control information directly to the subscriber station. The present invention further comprises a relay station for implementing the above method and an improved base station. In the method and devices provided by the present invention, with the introduction of relaying access technique, subscriber stations located with the long distance to the base station or in shadowing areas may be connected by relaying.