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Method of, and system for, reserving timeslots in a TDMA system

A time slot and time technology, applied in the field of centralized management of radio channels by base stations, can solve problems such as waste of transmission bandwidth and achieve efficient utilization

Inactive Publication Date: 2013-05-29
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this has the disadvantage that, with little transmission delay, this method of conflict resolution will result in a waste of transmission bandwidth

Method used

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  • Method of, and system for, reserving timeslots in a TDMA system
  • Method of, and system for, reserving timeslots in a TDMA system
  • Method of, and system for, reserving timeslots in a TDMA system

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Embodiment Construction

[0041] In order to better understand the present invention, the following table will first give the basic properties of various PN (pseudo-random noise) sequences. Here, in each case, for the various sequence types, the sequence length, number of available sequences, autocorrelation and peak cross-correlation are given. The quasi-synchronous timing of the received sequence in the receiver is a precondition for the representation of the autocorrelation and cross-correlation of the QS(OG-3) sequence, i.e. at + / -1.5 symbols for QS(OG-3) and for Bias within + / - 0.5 symbols of QS(OG-1). The M sequence is obtained from the feedback shift register using the XOR logic operation in the feedback branch. The "preferred gold" sequence is obtained by performing an XOR logic operation on two M sequences whose phases change relatively. The QS(OG-1) sequence is an Orthogonal Gold sequence (a "Preferred Gold" sequence extended with one base element). By selection, the QS(OG-3) sequence was ...

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Abstract

A method of, and system for, reserving timeslots in a TDMA system of a type in which a plurality of subscriber units (CPE) use the same radio channel for transmission during different timeslots to a base station and in which the base station administers the radio channel centrally enable subscriber units to transfer, if appropriate, a transmission request to the base station in the form of a PN (Pseudo-random noise) sequence (e.g., M-sequence, preferred gold, Katsami or orthogonal gold sequence). Transmission requests from different subscriber units can be identified at the base station using the PN sequence, reception time of the PN sequence and / or phase of the PN sequence.

Description

technical field [0001] The present invention relates to a method and system for reserving time slots in a TDMA (Time Division Multiple Access) system in which multiple subscriber units use the same radio channel to transmit during different time slots, and in particular to central management of radio channels by a base station . Background technique [0002] In a TDMA system, especially in a TDMA point-to-multipoint radio system (PMP), a general type of system and a general type of method are used to assign subscriber units ((CPE) customer premises equipment) in time sequence transmission over a limited range of radio channels. In a TDMA multipoint system, multiple users transmit in time sequence using the same radio channel in the uplink (ie, when transmitting from a subscriber unit to a base station). Since the data is sent in a burst-like fashion, this is especially inefficient when sending small amounts of data (e.g. only reservation requests), since a preamble or Int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26
CPCH04B7/2656
Inventor H·赫尔姆克
Owner TELEFON AB LM ERICSSON (PUBL)