Uplink pilot and signaling transmission in wireless communication systems
First Claim
1. A method for transmitting pilot signals on an uplink in a wireless communication system, comprising:
- partitioning a plurality of usable subbands suitable for use for data transmission into at least two disjoint groups of subbands;
assigning a first group in the at least two disjoint groups to a terminal; and
receiving pilot transmission from the terminal on the subbands in the first group.
1 Assignment
0 Petitions
Accused Products
Abstract
Techniques to more efficiently transmit pilot and signaling on the uplink in an OFDM system. With subband multiplexing, M usable subbands in the system are partitioned into Q disjoint groups of subbands. Each subband group may be assigned to a different terminal for uplink pilot transmission. Multiple terminals may transmit simultaneously on their assigned subbands. The transmit power for the pilot may be scaled higher to attain the same total pilot energy even though S instead of M subbands are used for pilot transmission by each terminal. Pilot transmissions from the terminals are received, and a channel estimate is derived for each terminal based on the pilot received on the assigned subbands. The channel estimate comprises a response for additional subbands not included in the assigned group. Subband multiplexing may also be used for uplink signaling transmission.
104 Citations
30 Claims
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1. A method for transmitting pilot signals on an uplink in a wireless communication system, comprising:
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partitioning a plurality of usable subbands suitable for use for data transmission into at least two disjoint groups of subbands;
assigning a first group in the at least two disjoint groups to a terminal; and
receiving pilot transmission from the terminal on the subbands in the first group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for transmitting pilot signals on an uplink in an orthogonal frequency division multiplexing (OFDM) communication system, comprising:
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partitioning a plurality of usable subbands suitable for use for data transmission into a plurality of disjoint groups of subbands, wherein each group in the plurality of disjoint groups includes the same number of subbands;
assigning one group in the plurality of disjoint groups to each of at least two terminals, wherein the at least two terminals are assigned at least two groups of subbands; and
receiving pilot transmission from the at least two terminals on the at least two groups of subbands. - View Dependent Claims (16)
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17. A method for transmitting a pilot signal on an uplink in a wireless communication system, comprising:
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receiving an assignment of a group of subbands to use for the pilot signal on the uplink, wherein the group includes a subset of a plurality of usable subbands suitable for use for data transmission;
determining transmit power to use for each of the subbands in the group, wherein the transmit power for each subband is scaled higher than the average transmit power per subband that would be used if pilot transmission were done on all subbands, by a scaling factor that is greater than one; and
transmitting the pilot signal on the subbands in the group at the determined transmit power.
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18. A method for transmitting signaling information on an uplink in a wireless communication system, comprising:
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partitioning a plurality of usable subbands suitable for use for data transmission into a plurality of disjoint groups of subbands;
assigning one group in the plurality of disjoint groups to each of at least two terminals, wherein the at least two terminals are assigned at least two groups of subbands; and
receiving signaling transmission, within a same time interval, from the at least two terminals on the at least two groups of subbands. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. An apparatus in a wireless communication system with a plurality of subbands, comprising:
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means for partitioning a plurality of usable subbands suitable for use for data transmission into at least two disjoint groups of subbands;
means for assigning a first group in the at least two disjoint groups to a terminal; and
means for receiving pilot transmission from the terminal on the subbands in the first group.
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26. The apparatus of 25, further comprising:
means for deriving a channel estimate for the terminal based on the pilot transmission received on the subbands in the first group, wherein the channel estimate covers at least one subband not included in the first group.
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27. An apparatus in a wireless communication system, comprising:
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means for receiving an assignment of a group of subbands to use for uplink pilot transmission, wherein the group includes a subset of a plurality of usable subbands suitable for use for data transmission; and
means for transmitting a pilot signal on the subbands in the group, wherein transmit power used for the pilot signal in each of the subbands in the group is scaled higher than the average transmit power per subband that would be used if pilot transmission were done on all subbands, by a scaling factor that is greater than one.
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28. An access point in a wireless communication system, comprising:
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a demodulator operative to receive pilot transmission from a terminal, wherein a plurality of disjoint groups of subbands are formed from a plurality of usable subbands suitable for use for data transmission, and wherein the pilot transmission is received on a first group of subbands selected from the plurality of disjoint groups and assigned to the terminal; and
a controller operative to derive a channel estimate for the terminal based on the received pilot transmission, wherein the channel estimate covers at least one subband not included in the group assigned to the terminal. - View Dependent Claims (29)
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30. An access point in a wireless communication system, comprising:
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a demodulator operative to receive signaling transmission, within the same time interval, from at least two terminals, wherein a plurality of disjoint groups of subbands are formed from a plurality of usable subbands suitable for use for data transmission, wherein each of the at least two terminals is assigned one group in the plurality of disjoint groups, wherein at least two groups are assigned to the at least two terminals, and wherein the signaling transmission from the at least two terminals is received on the at least two groups of subbands; and
a controller operative to process the signaling transmission received from the at least two terminals.
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Specification