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Communication system

A communication system and communication signal technology, applied in wireless communication, transmission system, relay system monitoring and other directions, can solve problems such as poor correspondence

Inactive Publication Date: 2006-12-20
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, even when predictions are based on more accurate reflections of path loss parameters that might be encountered in the real world, simulations of multi-hop systems unexpectedly reveal discrepancies between predicted and simulated gains. poor correspondence

Method used

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Embodiment Construction

[0331] A first example of an algorithm implementing an embodiment of the first aspect of the present invention is described below with reference to FIG. 3 , wherein the source device includes a Node B (NB), and the intermediate device includes a relay node ( RN), while the destination device includes user equipment (UE). The user equipment continuously monitors the RSS and derives an indicator of the received signal strength and its difference relative to the target received signal strength. The destination device is equipped with index deviation detection means for detecting changes in one or both of these indexes. The Node B is equipped with control means having first computing means according to an embodiment of the first aspect of the invention.

[0332] The details of the algorithm are summarized as follows:

[0333] Downlink Algorithm 1: Part 1

[0334] Trigger: NB receives a request from UE to change RN transmit power

[0335] Algorithm Input Demand Side Source

[...

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Abstract

The present application relates to a wireless communication system and related methods and apparatuses for transmitting a signal from a source apparatus to a destination apparatus, via at least one intermediate apparatus. In particular, the present invention relates to techniques which seek to improve the throughput of data in multi-hop communication systems.

Description

technical field [0001] The present invention relates to wireless communication systems and related methods for transmitting signals from a source device to a destination device through at least one intermediate device. In particular, the present invention relates to techniques that attempt to increase data throughput in multi-hop communication systems. Background technique [0002] It is well known that propagation loss (or "path loss") that occurs in radio communications due to scattering or absorption as it propagates through space results in a reduction in the strength of the signal. Factors that affect the path loss between the transmitter and receiver include: transmitter antenna height, receiver antenna height, carrier frequency, clutter type (urban, suburban, rural), terrain details (e.g. height, density, spacing, Terrain type (hills, flat)). The path loss L(dB) between the transmitter and receiver can be modeled by: [0003] L=b+10nlogd (A) [0004] whe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04B7/26H04B17/40
CPCH04W52/46H04B7/2606H04B17/006H04W88/04H04W28/08H04B17/0057Y02B60/50H04B17/318H04B17/336H04W28/0942H04W28/0983H04W28/18H04W84/18Y02D30/70
Inventor 迈克尔·约翰·哈特
Owner FUJITSU LTD