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Communications system handoff operation combining turbo coding and soft handoff techniques

A mobile communication system and mobile receiver technology are applied in the field of communication systems to achieve the effect of reliable handover

Inactive Publication Date: 2004-06-16
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The BERROU patent suggests that TURBO coding should only be used for Gaussian channels and not for channels affected by fading

Method used

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  • Communications system handoff operation combining turbo coding and soft handoff techniques
  • Communications system handoff operation combining turbo coding and soft handoff techniques
  • Communications system handoff operation combining turbo coding and soft handoff techniques

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Embodiment Construction

[0090] Compared with the conventional technology, the present invention uses diversity and soft handover technology to improve the call reliability during the handover operation. Performance enhancements are provided by implementing code diversity combining and packet combining combined with iterative decoding processing during handover operations. Improved communication can be used for the forward link or the reverse link or both. The invention can also be applied to terrestrial cellular systems and satellite-based cellular systems.

[0091] A system for satellite digital audio broadcasting using TURBO coding technology is described in US Patent 08 / 908045 "Method and System for TURBO Encoding Satellite Digital Audio Broadcasting" invented by the same inventor of the present invention and assigned to the same assignee of the present invention. The disclosure of the above-mentioned application is incorporated herein by reference.

[0092] As shown in FIG. 4, if the mobile station 4...

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Abstract

Communication systems, including, for example, cell-based mobile communication systems, multiple satellite communication systems, or multibeam satellite systems, require reliable handoff methods between cell-to-cell, beam-to-beam, or satellite-to-satellite respectively. Recent measurement of a CDMA cellular system indicates that the system is in handoff about 30 % to 50 % of an average call period. Therefore, system reliability during handoff is one of the major system performance parameters and eventually becomes a factor in the overall system capacity. The present invention advantageously relates to novel and improved techniques for handoff in cellular communications, multibeam and multisatellite systems. The present invention combines the soft handoff mechanism with a code diversity combining technique(i.e., combining signals from multiple sources), a packet combining technique(i.e., combining multiple signals), and an iterative decoding algorithm (e.g., Turbo Coding (502)).

Description

Technical field [0001] The invention relates to a communication system. More specifically, the present invention relates to a new and improved system for providing communication with mobile stations during handovers between cell base stations or between sectors or between satellite beams and / or between satellites. The present invention combines soft handoff technology with code diversity combining technology, subgroup combining technology and iterative decoding algorithm (referred to as TURBO coding). The system works in code division multiple access (CDMA), frequency division multiple access (FDMA) or time division multiple access (TDMA) communication systems. Background technique [0002] In a communication system with geographically fixed stations and mobile stations, when the mobile station moves away from the first fixed station and approaches the second fixed station, it is necessary to handover the communication with the mobile station from the first fixed station to the s...

Claims

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Application Information

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IPC IPC(8): H04B7/185H04B7/26H04L1/00H04L1/06H04L1/20H04W36/18
CPCH04L2001/0092H04L1/0066H04L1/005H04L1/02H04B7/18541H04L1/0069H04L1/0077H03M13/6381H04W36/18H04L1/20H04W36/00692H04B7/26
Inventor 易炳宽
Owner LG ELECTRONICS INC
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