Relay Station Bandwidth Request Latency Reduction
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Solution Overview
Problem
Conventional wireless relay systems experience increased latency in bandwidth request procedures, especially in multi-hop networks, due to the need for RSs to contend multiple times using Contention-based CDMA ranging codes to obtain bandwidth for forwarding bandwidth requests from subordinate network entities.
Innovation Solution
A bandwidth request method where relay stations (RSs) judge their available bandwidth and either use it directly to send bandwidth requests to a superordinate network entity or send CDMA ranging codes if bandwidth is not available, thereby reducing the need for multiple contentions and signaling exchanges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If relay stations use Contention-based CDMA ranging codes to request bandwidth allocation in multi-hop networks, then bandwidth allocation can be achieved, but latency in bandwidth request procedures increases due to multiple contentions and signaling exchanges
Solution Approach 1:
The patent applies preliminary action by having relay stations pre-obtain uplink bandwidth allocation before needing to forward bandwidth requests. The base station provides relay stations with bandwidth resources in advance through dedicated signaling, so when bandwidth requests need to be forwarded, the relay stations can do so immediately without entering contention-based ranging procedures, thereby reducing latency and signaling overhead.
2Productivity
If relay stations forward bandwidth requests through multiple hops using conventional CDMA ranging codes, then bandwidth allocation can be achieved, but the number of signaling exchanges and contentions increases
Solution Approach 1:
The patent extracts the bandwidth request forwarding function from the contention-based ranging procedure. Instead of using CDMA ranging codes for bandwidth request forwarding, the system separates this function by providing relay stations with dedicated uplink bandwidth allocation and specific resource indicators, allowing relay stations to forward bandwidth requests directly on allocated resources without contention or ranging overhead.
3Loss of time
If relay stations use dedicated uplink bandwidth allocation with resource indicators, then bandwidth request latency is reduced, but bandwidth allocation complexity increases
Solution Approach 1:
The patent introduces resource indicators as intermediaries between the base station's bandwidth allocation decisions and the relay stations' transmission actions. The base station provides resource indicators that explicitly tell relay stations which time-frequency resources to use for forwarding bandwidth requests, eliminating the need for relay stations to independently manage complex bandwidth allocation while still achieving low-latency direct transmission.
Data Source
AI summary
The present invention provides a bandwidth method and a relay station (RS). After receiving the bandwidth request message sent by subordinate network entity, RS judges whether it has available bandwidth; if it has available bandwidth, sending a bandwidth request message to superordinate network entity based on the available bandwidth; otherwise, requesting bandwidth from superordinate network entity using CDMA ranging codes.