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EP0568212A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Procedure for the handover of a radio connection

Assignee: Nokia Oyj
•
Filing: 1993-04-14
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Granted: —
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Expires: 2013-04-14
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Abstract

Abstract In a digital micro or pico cell network based on Time Division Multiple Access, comprising a Mobile Services Switching Center, Base Station Controllers with which a number of Base Transceiver Stations have been connected, and several Mobile Stations, a handover can be accomplished so that the parameters required in identifying a Mobile Station, and the frequency data, the data of the time interval to be used, as well as the frame number data of the channel are given to a new Base Transceiver Station to which a Mobile Station will be moved. The new Base Transceiver Station is tuned to listen to the channel determined by the data it received. The former Base Station transmits a handover command to the Mobile Station containing the frequency data, the data of the time interval to be used, as well as the frame number data of the channel to which the new Base Station has moved. After the command the Mobile Station turns the trafficing directly to said channel. The timing measurements between the Base Station and the Mobile Station are not carried out.

Inventors

  • 👤 Ilkka Keskitalo

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-03 22:38
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/0005; H04W36/0055; H04W36/0072; H04W36/08; H04W36/10

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 105 words
A procedure for the handover of a radio connection to a mobile radio station from a first base station to a second base station in a Time Division Multiple Acess (TDMA) cellular radio communications network, the procedure comprising; transmitting to the second base station identification information regarding the mobile station including frequency channel information enabling tuning of the second base station to the channel in which the mobile station shall transmit; transmitting to the mobile station a handover command not including information on the timing of the second base station; and correcting for deviation in signal timing caused by a change in timing during handover.
Claim 2
Dependent Claim 53 words
A procedure as claimed in claim 1, wherein the mobile station identification information transmitted to the second base station and the handover signal transmitted to the mobile station both include channel frequency information, and information regarding the time interval and frame number of the channel to which the mobile station will be moved.
Claim 3
Dependent Claim 28 words
A procedure as claimed in claim 1 or claim 2, wherein the mobile station may initiate trafficing immediately the mobile station moves to the new channel for handover.
Claim 4
Dependent Claim 42 words
A procedure as claimed in any of claims 1 to 3, wherein a channel equalizer is utilized to correct for both timing errors caused by the radio channel and deviation caused by a change in the timing during handover between base stations.
Claim 5
Dependent Claim 26 words
A procedure as claimed in any previous claim, wherein the timing difference between the first and second base stations is known by the second base station.
Claim 6
Dependent Claim 30 words
A procedure as claimed in claim 5, wherein the timing difference is known because the first and second base stations operate as part of a network which is partly synchronous.
Claim 7
Dependent Claim 30 words
A procedure as claimed in claim 5, wherein the timing difference is known because the first and second base stations operate as part of a network which is entirely synchronous.

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