Base station synchronisation
First Claim
1. A method for determining data enabling a plurality of base stations to time their transmissions to a mobile station within a timing range, the method comprising the steps of:
- obtaining, in the mobile station, time delays of transmissions from each of the plurality of base stations in reaching the mobile station, wherein the plurality of base stations includes a primary base station and one or more secondary base stations;
determining, in the mobile station, time delay differences between the time delays and a reference time delay, wherein the reference time delay is associated with the primary base station transmission and the time delays comprise time delays of the secondary base station transmissions;
transmitting the time delay differences from the mobile station to the plurality of base stations via at least one link that is specific to the mobile station in order to enable the timing of transmissions by the base stations to be corrected, wherein the mobile station transmits the time delay differences using a reference signal, and wherein the step of transmitting the time delay differences further comprises the steps of;
determining an adjustment factor corresponding to each determined time delay difference, andapplying the adjustment factor on the reference signal intended for each of the secondary base stations,wherein the reference signal includes a constant amplitude zero autocorrelation sequence, the adjustment factor comprises an angular adjustment factor corresponding to the determined time delay difference, and the step of applying the adjustment factor comprises shifting the reference signal for at least one secondary base station with an angle comprising the corresponding angular adjustment factor.
1 Assignment
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Accused Products
Abstract
A method for determining data enabling a plurality of secondary base stations to time their transmissions to a mobile station within a timing range. The mobile station obtains time delays of transmissions from each of the secondary base stations in reaching the mobile station, and determines time delay differences between the time delays and a reference time delay associated with a primary base station. The mobile station transmits the time delay differences to the plurality of secondary base stations. Each secondary base station receives the difference between its own transmission time delay and the reference time delay, compares the difference with a time range, and corrects the timing of its transmissions if the difference is outside of the time range.
5 Citations
16 Claims
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1. A method for determining data enabling a plurality of base stations to time their transmissions to a mobile station within a timing range, the method comprising the steps of:
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obtaining, in the mobile station, time delays of transmissions from each of the plurality of base stations in reaching the mobile station, wherein the plurality of base stations includes a primary base station and one or more secondary base stations; determining, in the mobile station, time delay differences between the time delays and a reference time delay, wherein the reference time delay is associated with the primary base station transmission and the time delays comprise time delays of the secondary base station transmissions; transmitting the time delay differences from the mobile station to the plurality of base stations via at least one link that is specific to the mobile station in order to enable the timing of transmissions by the base stations to be corrected, wherein the mobile station transmits the time delay differences using a reference signal, and wherein the step of transmitting the time delay differences further comprises the steps of; determining an adjustment factor corresponding to each determined time delay difference, and applying the adjustment factor on the reference signal intended for each of the secondary base stations, wherein the reference signal includes a constant amplitude zero autocorrelation sequence, the adjustment factor comprises an angular adjustment factor corresponding to the determined time delay difference, and the step of applying the adjustment factor comprises shifting the reference signal for at least one secondary base station with an angle comprising the corresponding angular adjustment factor. - View Dependent Claims (2, 3, 4)
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5. A mobile station for determining data allowing a plurality of base stations to time their transmissions to the mobile station within a timing range, the mobile station comprising:
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at least one radio communication unit for communicating with the plurality of base stations; and a control unit configured to; obtain time delays of transmissions from each of the plurality of base stations in reaching the mobile station, wherein the plurality of base stations includes a primary base station and one or more secondary base stations; determine time delay differences between the time delays and a reference time delay, wherein the reference time delay is associated with the primary base station transmission and the time delays comprise time delays of the secondary base station transmissions; and control the radio communication unit to transmit the time delay differences from the mobile station to the plurality of base stations via at least one link that is specific to the mobile station in order to enable the timing of transmissions by the base stations to be corrected, wherein the radio communication unit transmits the time delay differences using a reference signal, and wherein the control unit is further configured to control the radio communication unit to perform the following as part of transmitting the time delay differences; determine an adjustment factor corresponding to each determined time delay difference, and apply the adjustment factor on the reference signal intended for each of the secondary base stations, wherein the reference signal includes a constant amplitude zero autocorrelation sequence, the adjustment factor comprises an angular adjustment factor corresponding to the determined time delay difference, and the radio communication unit applies the adjustment factor by shifting the reference signal for at least one secondary base station with an angle comprising the corresponding angular adjustment factor. - View Dependent Claims (6)
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7. A method for controlling timing of transmissions to a mobile station from a base station, the method comprising the steps of:
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receiving, in a device for controlling the timing and from the mobile station via at least one link that is specific to the mobile station, a difference between a time delay of the transmissions of the base station to the mobile station and a reference time delay; comparing, in said device, the time delay difference with a time range within which the base station is to time its transmissions to the mobile station; and correcting, by said device, the timing of the base station transmissions to the mobile station if the difference is outside of the time range. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A device for controlling timing of transmissions to a mobile station from a base station, the device comprising:
a control unit configured to; receive, from the mobile station via at least one link that is specific to the mobile station, a difference between a time delay of the transmissions of the base station to the mobile station and a reference time delay; compare the time delay difference with a time range within which the base station is to time its transmissions to the mobile station; and correct the timing of the base station transmissions to the mobile station if the difference is outside of the time range. - View Dependent Claims (15, 16)
Specification