Macro diversity using likelihood values
First Claim
1. A method in a serving base station comprising:
- receiving a signal transmitted from a user equipment for the serving base station, said signal conveying coded bits;
demodulating the signal to obtain demodulated soft bits corresponding to the coded bits;
decoding the demodulated soft bits to obtain first likelihood values for information data bits encoded by the coded bits;
receiving second likelihood values for the information data bits from a supporting base station that also received and decoded the signal transmitted from the user equipment for the serving base station;
determining binary values for the information data bits by making hard bit decisions on combined likelihood values obtained by combining the first and second likelihood values, or by selecting the first or the second likelihood values for use in making the hard bit decisions, in dependence on determining whether the serving base station or the supporting base station received the information data with the least distortion.
1 Assignment
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Accused Products
Abstract
Method and arrangement in a serving base station for determining a binary value of information data received from a user equipment, by using a supportive likelihood value received from a supporting base station. The user equipment transmits information data to be received both by the serving base station and the supporting base station base station. The method comprises: decoding information data bits received from the user equipment into a first likelihood value, without determining a binary value for each bit of the information data, a supportive likelihood value of the information data bits transmitted from the user equipment is received from the supporting base station, which supportive likelihood value is based on a decoding of the information data bits performed in the supporting base station. The first likelihood value of the decoded information bits is combined with the received supportive likelihood value of the decoded information bits. Thus a binary value for each bit of the information data transmitted from the user equipment is determined, based on the combined first and supportive likelihood values.
15 Citations
19 Claims
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1. A method in a serving base station comprising:
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receiving a signal transmitted from a user equipment for the serving base station, said signal conveying coded bits; demodulating the signal to obtain demodulated soft bits corresponding to the coded bits; decoding the demodulated soft bits to obtain first likelihood values for information data bits encoded by the coded bits; receiving second likelihood values for the information data bits from a supporting base station that also received and decoded the signal transmitted from the user equipment for the serving base station; determining binary values for the information data bits by making hard bit decisions on combined likelihood values obtained by combining the first and second likelihood values, or by selecting the first or the second likelihood values for use in making the hard bit decisions, in dependence on determining whether the serving base station or the supporting base station received the information data with the least distortion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An arrangement in a serving base station, said arrangement comprising:
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a receiver configured to receive a signal transmitted from a user equipment for the serving base station, said signal conveying coded bits; a demodulator configured to demodulate the signal to obtain demodulated soft bits for the coded bits; a decoder configured to decode the demodulated soft bits to obtain first likelihood values for information data bits encoded by the coded bits; an intra base station connection interface configured to receive second likelihood values for the information data bits from a supporting base station that also received and decoded the signal transmitted from the user equipment for the serving base station; and a determining unit configured to determine binary values for the information data bits by making hard bit decisions on combined likelihood values obtained by combining the first and second likelihood values, or by selecting the first or the second likelihood values for use in making the hard bit decisions, in dependence on determining whether the serving base station or the supporting base station received the information data with the least distortion. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method in a supporting base station that is configured to assist a serving base station in determining binary values of information data bits encoded in a signal transmitted by a user equipment for the serving base station, said method comprising:
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receiving, at the supporting base station, the signal transmitted by the user equipment for the serving base station; demodulating the signal to demodulated soft bits for coded bits conveyed in the signal; decoding the demodulated soft bits to obtain likelihood values for the information data bits encoded by the coded bits; and reducing an amount of assistance data sent from the supporting base station to the serving base station by transmitting the likelihood values for the information data bits to the serving base station without also including the demodulated soft bits, to assist the serving base station in making hard bit decisions on the information data bits. - View Dependent Claims (18)
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19. An arrangement in a supporting base station that is configured to assist a serving base station in determining binary values of information data bits encoded in a signal transmitted from a user equipment for the serving base station, said arrangement comprising:
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a receiver configured to receive the signal transmitted from the user equipment for the serving base station; a demodulator configured to demodulate the signal to obtain demodulated soft bits for coded bits conveyed in the signal; a decoder configured to decode the demodulated soft bits to obtain likelihood values for the information data bits encoded by the coded bits; and an intra base station connection interface configured to reduce the amount of assistance data sent from the supporting base station to the serving base station by transmitting the likelihood values for the information data bits to the serving base station without also including the demodulated soft bits, to assist the serving base station in making hard bit decisions on the information data bits.
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Specification