Transmission system for transmitting digital signals on a radio subscriber line network

• US 6,577,612 B1
• Filed: 11/25/1998
• Issued: 06/10/2003
• Est. Priority Date: 11/25/1997
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Zirwas, Wolfgang
• Primary Examiner(s): Yao, Kwang Bin
• Assistant Examiner(s): Harper, Kevin C.
• Application Number:
  US09/200,112
• Time in Patent Office: 1,658 Days
• Field of Search: 370/319, 370/321, 370/329-330, 370/336, 370/337, 370/347, 455/422, 455/450, 455/522, 455/451, 455/452, 375/295, 375/298
• US Class Current: 370/336
• CPC Class Codes: H04B 7/2659 for data rate control
• CPC Class Codes: H04J 4/00 Combined time-division and frequency-division multiplex systems H04J13/00 takes precedence ; data transmission H04L5/26; telemetry G08C15/00
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04W 16/00 Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
• CPC Class Codes: H04W 84/14 WLL [Wireless Local Loop]; RLL [Radio Local Loop]

Abstract

In a radio subscriber line network, the overall transmission power of the base station for the digital signal transmission from the base station to the radio subscribers is divided onto a number of radio channels having a differing bit number per symbol, the digital signals intended for radio subscribers located at a greater or smaller distance from the base station are transmitted with correspondingly higher or lower bit number per symbol, whereby the multiply transmitted bits are respectively recombined to a single bit at the reception side.

Claims

1. A system for transmitting digital signals in a broadband RLL (radio in the local loop) subscriber line network comprising:

a radio cell having a base station and at least one radio subscriber located in the radio cell;

a transmitter means in said base station for transmitting digital signals from said base station to said radio subscriber in time-division multiplex radio channels with a differing bit number per message signal element according to an aggregate bit clock, said transmitter means including means for allocating a radio channel having a required bit number per message signal element to every transmission from said base station to said radio subscribers dependent on a distance from said base station to said radio subscriber, with digital signals to radio subscribers at a greater distance from said base station being transmitted in radio channels having a higher number of bits per message signal element, and digital signals to radio subscribers at a smaller distance from said base station being transmitted in radio channels having a lower number of bits per message signal element; and

means in said radio subscriber for recombining said transmitted bits per message signal element to a single bit.

2. A system for transmitting digital signals as claimed in claim 1, wherein said radio channels include a radio channel to a radio subscriber at a smaller distance from said base station having an inadequate signal-to-noise ratio and wherein said transmitter means includes means for transmitting said digital signals on said radio channel with an inadequate signal-to-noise ratio with a correspondingly higher bit number per message signal element.