Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

System and method for radio channel communication in CDMA communication system

A wireless channel and code division multiple access technology, which is applied in the field of code division multiple access mobile communication systems, can solve the problems of reducing communication efficiency and difficulty in obtaining accurate synchronization of time slots between sending and receiving parties

Inactive Publication Date: 2003-08-13
NEC CORP
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to obtain precise synchronization of the sending and receiving side slots
As will be described later, it is necessary to set a large guard time to offset the synchronization deviation, which will reduce the communication efficiency

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • System and method for radio channel communication in CDMA communication system
  • System and method for radio channel communication in CDMA communication system
  • System and method for radio channel communication in CDMA communication system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] For a better understanding of the present invention, reference will first be made to figure 1 The prior art CDMA mobile communication system is described.

[0042] The CDMA mobile communication system includes a base station 500 and a plurality of mobile units 510, 520 and 530 located in the service area of ​​the base station 500. When the mobile units 510, 520 and 530 are communicating at the same time, in order to assign radio channels to the mobile units in the CDMA system, different radio channels are allocated using different spreading codes. Specifically, wireless channel 515 with spreading code #1 is assigned to mobile unit 510, wireless channel 525 with spreading code #2 is assigned to mobile unit 520, and wireless channel 535 with spreading code #3 is assigned to mobile unit 530 .

[0043] exist figure 1 In the traditional CDMA mobile communication system, the number of wireless channels in the service area is determined by the number of spreading codes. Th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

In a code division multiple access mobile communication system, a communication signal is modulated and multiplexed with different diffusion codes and is used in date communication between a base station (30) and each of mobile units (40, 41, 42). The communication signal is a time division multiplex signal with a repeated frame having a plurality of time slots (TS0, TS1, TS2) assigned to different radio channels, respectively. A slot synchronous signal is produced in accordance with a reference clock signal of a global positioning system. The time slots are synchronized between the base station and each of the mobile units in accordance with the slot synchronous signal.

Description

technical field [0001] The present invention relates to a code division multiple access (CDMA) mobile communication system, and more specifically relates to a wireless channel multiplexing communication method, a mobile unit and a base station used in the CDMA mobile communication system. Background technique [0002] The known mobile communication system comprises a base station control device connected with the mobile communication switching unit through a wired channel, a plurality of base stations connected with the base station control device through wired channels, and a plurality of wireless channels located in the service area of ​​each base station Mobile units connected to the base station. [0003] Therefore, together with frequency division multiple access (FDMA) and time division multiple access (TDMA) methods, as a method of multiplexing wireless channels between each base station and multiple mobile units to obtain multiple channels The method, code division ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04W16/02H04B7/216H04B7/26H04J3/00H04J13/00H04L7/08H04W56/00H04W64/00H04W72/04
CPCH04B7/2618H04B7/216H04W56/00H04W72/04
Inventor 石本伸明本吉彦
Owner NEC CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com