Apparatus and method for mode transition of a transmit diversity scheme in a mobile communication system for using transmit diversity scheme in a mobile communication system for using transmit
First Claim
1. A method for controlling a Node B to change a Transmit Diversity scheme to another scheme in a mobile communication system including the Node B for transmitting data using the Transmit Diversity scheme and a Mobile Station (MS) for transmitting weights of antennas to the Node B to provide the Node B with maximum Transmit Diversity performance, such that it can implement a maximum Transmit Diversity, the method comprising the steps of:
- determining whether there is a mode transition in the Transmit Diversity scheme upon receiving Transmit Diversity information, wherein the mode transition comprises a transition between a Mode1 scheme and a Mode2 scheme comprised in an open loop transmit diversity scheme or a Mode1 scheme and a Mode2 scheme comprised in a closed loop transmit diversity scheme, or a transition between the open loop transmit diversity scheme and the closed loop transmit diversity scheme;
generating weights associated with individual antennas using a predetermined relationship between weights selected for use depending on the determined mode transition, if it is determined that the mode transition occurs in the Transmit Diversity scheme;
transmitting data using the generated weights; and
associating a weight of a Transmit Diversity scheme used before the mode transition with a weight of a Transmit Diversity scheme to be used after the mode transition, such that the weights of the Transmit Diversity schemes are positioned in a same quadrant included in a constellation indicative of weight information.
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Accused Products
Abstract
An apparatus and method for Transmit Diversity mode transition in a mobile communication system for use with transmit diversity is disclosed. In a mobile communication system including a Node B comprising one or more antennas and a Mobile Station (MS) for transmitting Transmit Diversity information to the Node B to enable the plurality of antennas to implement the maximum Transmit Diversity. The apparatus and method for assigning weights to transmission data of the antennas to enable the Node B to implement the maximum Transmit Diversity when the mode transition occurs in the Transmit Diversity modes comprise determining whether the mode transition occurs using the Transmit Diversity information; and assigning a weight generated considering the relationship between a current weight and a previous weight used before the mode transition time to the data transmitted over the antennas if it is determined that the mode transition occurs.
31 Citations
16 Claims
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1. A method for controlling a Node B to change a Transmit Diversity scheme to another scheme in a mobile communication system including the Node B for transmitting data using the Transmit Diversity scheme and a Mobile Station (MS) for transmitting weights of antennas to the Node B to provide the Node B with maximum Transmit Diversity performance, such that it can implement a maximum Transmit Diversity, the method comprising the steps of:
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determining whether there is a mode transition in the Transmit Diversity scheme upon receiving Transmit Diversity information, wherein the mode transition comprises a transition between a Mode1 scheme and a Mode2 scheme comprised in an open loop transmit diversity scheme or a Mode1 scheme and a Mode2 scheme comprised in a closed loop transmit diversity scheme, or a transition between the open loop transmit diversity scheme and the closed loop transmit diversity scheme; generating weights associated with individual antennas using a predetermined relationship between weights selected for use depending on the determined mode transition, if it is determined that the mode transition occurs in the Transmit Diversity scheme; transmitting data using the generated weights; and associating a weight of a Transmit Diversity scheme used before the mode transition with a weight of a Transmit Diversity scheme to be used after the mode transition, such that the weights of the Transmit Diversity schemes are positioned in a same quadrant included in a constellation indicative of weight information. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A data transmission apparatus for implementing a maximum Transmit Diversity when changing a current Transmit Diversity scheme to another scheme in a mobile communication system including a Node B for transmitting data using a Transmit Diversity scheme and a Mobile Station (MS) for transmitting weights of a plurality of antennas to the Node B to provide the Node B with maximum Transmit Diversity performance, the apparatus comprising:
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a mode transition determination unit for determining whether there is a mode transition in the Transmit Diversity scheme upon receiving Transmit Diversity information, wherein the mode transition comprises a transition between a Mode1 scheme and a Mode2 scheme comprised in an open loop transmit diversity scheme or a Mode1 scheme and a Mode2 scheme comprised in a closed loop transmit diversity scheme, or a transition between the open loop transmit diversity scheme and the closed loop transmit diversity scheme; a weight generator for generating weights associated with individual antennas using a predetermined relationship between weights selected for use according to the determination result of the mode transmission determination unit, and transmitting the generated weights to a signal processor; and the signal processor for transmitting data using the generated weights, wherein the weight generator determines whether the mode transition occurs in the Transmit Diversity scheme, selectively generates a weight in response to the mode transition from among a constellation including a weight of a Transmit Diversity scheme used before the mode transition and a weight of a Transmit Diversity scheme to be used after the mode transition in a same quadrant if it is determined that the mode transition occurs in the Transmit Diversity scheme, and generates a new weight using received weight information if it is determined that no mode transition occurs in the Transmit Diversity scheme. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for changing a Transmit Diversity scheme to another scheme in a mobile communication system including a Node B for transmitting data using the Transmit Diversity scheme and a Mobile Station (MS) for transmitting weights of a plurality of antennas to the Node B so as to provide the Node B with maximum Transmit Diversity performance, the method comprising the steps of:
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receiving, by the MS, transmission signals from the plurality of antennas, and estimating channel state of the Node B; determining weights of the antennas having the maximum Transmit Diversity using the estimated channel state, including the determined weights in Transmit Diversity information, and transmitting the Transmit Diversity information containing the determined result; and determining, by the Node B, whether a mode transition occurs in the Transmit Diversity scheme on the basis of the Transmit Diversity information, wherein the mode transition comprises a transition between a Mode1 scheme and a Mode2 scheme comprised in an open loop transmit diversity scheme or a Mode1 scheme and a Mode2 scheme comprised in a closed loop transmit diversity scheme, or a transition between the open loop transmit diversity scheme and the closed loop transmit diversity scheme, and generating weights associated with individual antennas by considering a predetermined relationship between weights selected for use depending on the determined mode transition if it is determined that the mode transition occurs in the Transmit Diversity scheme; and transmitting data over the plurality of antennas using the generated weights, wherein the relationship between predetermined Transmit Diversity schemes associates a weight of a Transmit Diversity scheme used before the mode transition with a weight of a Transmit Diversity scheme to be used after the mode transition, such that the weights of the Transmit Diversity schemes are positioned in a same quadrant included in a constellation indicative of weight information. - View Dependent Claims (16)
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Specification