Initializing Reference Signal Generation in Wireless Networks
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Abstract
A transmitting node uses different reference signal sequences for different types of enhanced control channels. An example method begins with generating (1410) a first reference signal sequence, from a first initialization value, and generating (1420) a second reference signal sequence, from a second initialization value. These reference signal sequences are associated with two corresponding enhanced control transmissions. A first enhanced control channel and reference symbols taken from the first reference signal sequence are transmitted (1430), using first time-frequency resources and a first set of transmission points or a first set of antenna ports or both, and a second enhanced control channel and reference symbols taken from the second reference signal sequence are also transmitted (1440), using a differing second set of transmission points and/or a differing second set of antenna ports and/or a differing second set of time-frequency resources, in the same subframe or group of subframes.
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Citations
76 Claims
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1-38. -38. (canceled)
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39. A method, implemented by a wireless base station, for transmitting reference signals in a wireless network, the method comprising:
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generating a first reference signal sequence from a first initialization value; and generating a second reference signal sequence from a second initialization value; transmitting a first enhanced control channel and reference symbols taken from the first reference signal sequence, using a first set of time-frequency resources and using a first set of transmission points or a first set of antenna ports or both; and transmitting a second enhanced control channel and reference symbols taken from the second reference signal sequence, using a second set of transmission points, differing from the first set of transmission points, or a second set of antenna ports, differing from the first set of antenna ports, or a second set of time-frequency resources, differing from the first set of time-frequency resources, or using any combination of these second sets, in the same subframe in which the first enhanced control channels and reference symbols from the first reference signal sequence are transmitted. - View Dependent Claims (40, 41, 42, 43, 44, 45)
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46. A method, implemented by a wireless device, for demodulating an enhanced control channel, the method comprising:
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selecting from a first reference signal sequence generated from a first initialization value and a second reference signal sequence generated from a second initialization value; performing channel estimation for a received signal, using reference symbols taken from the selected reference signal sequence; and demodulating an enhanced control channel using the channel estimation results. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
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58. A wireless base station, comprising:
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a reference signal generation unit adapted to generate a first reference signal sequence from a first initialization value and to generate a second reference signal sequence from a second initialization value; and a transmission control unit adapted to transmit both a first enhanced control channel and reference symbols taken from the first reference signal sequence, using a first set of time-frequency resources and using a first set of transmission points or a first set of antenna ports or both, and, in the same subframe, to transmit both a second enhanced control channel and reference symbols taken from the second reference signal sequence, using a second set of transmission points, differing from the first set of transmission points, or a second set of antenna ports, differing from the first set of antenna ports, or a second set of time-frequency resources, differing from the first set of time-frequency resources, or using any combination of these second sets. - View Dependent Claims (59, 60, 61, 62, 63, 64)
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65. A wireless device, comprising:
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a reference signal selection circuit adapted to select from a first reference signal sequence generated from a first initialization value and a second reference signal sequence generated from a second initialization value; a channel estimator circuit adapted to perform channel estimation for a received signal, using reference symbols taken from the selected reference signal sequence; and a demodulator circuit adapted to demodulate an enhanced control channel using the channel estimation results. - View Dependent Claims (66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76)
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Specification