Abstract
Transmitting an ACK/NACK response in a wireless cellular network by mapping the data value into a cyclic shifted version of a reference signal. A subframe is formed (704) with a plurality of symbols with certain symbols designated as reference signal (RS) symbols. The receiver and transmitter both know when an ACK/NACK response is expected. If an ACK/NACK response is not expected (706) then an RS is inserted (708) in the duration of symbols designated as RS symbols. If an ACK/NACK response is expected then the ACK/NACK response is embedded (710) in one or more of the symbols designated as RS symbols. The subframe is transmitted (712) to a receiver and the receiver can determine the ACK/NACK value in the RS symbol if present and also use the RS symbol for coherent demodulation of a CQI (channel quality indicator) or data.
Technologies
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Use Cases
Wireless communication
Services
Claim
1. A method for transmitting in a wireless cellular network, comprising: determining a data value for one or more data bits; mapping the data value to a cyclic shift amount; constructing a pre-defined base signal using orthogonal frequency-division multiplexing (OFDM) modulation, where OFDM modulation comprises mapping a constant amplitude sequence onto a set of tones; cyclically shifting the base signal in the time-domain by the mapped cyclic shift amount representative of the data value to form a cyclic shifted base signal; and transmitting the cyclic shifted base signal to a receiver, whereby the receiver can determine the data value by determining the shift amount.
2. The method of Claim 1, further comprising transmitting a channel quality indicator (CQI) in conjunction with the cyclic shifted CAZAC-like sequence, whereby the receiver may use the cyclic shifted CAZAC-like sequence as a reference signal for coherent demodulation of the CQI.
3. The method of Claim 2, further comprising: receiving a signal at the receiver that includes the transmitted cyclic shifted CAZAC-like sequence; determining the shift amount of the transmitted cyclic shifted CAZAC-like sequence; and extracting the data value in accordance with the shift amount.
4. The method of Claim 3, wherein determining the shift amount comprises: demodulating the received signal with the base CAZAC-like sequence to obtain the estimated channel taps; and estimating the shift amount based on at least one of: a) a location of a maximum channel tap; b) a maximum section energy wherein a length of the CAZAC-like sequence is divided into N sections.
5. The method of Claim 3, 4 or 5, further comprising using the cyclic shifted CAZAC-like sequence as a reference signal for coherent demodulation of the CQI.
6. A method for transmitting in a wireless cellular network, comprising: forming a subframe with a plurality of symbols with certain symbols designated as reference signal (RS) symbols; determining if an ACK/NACK response is expected; if ACK/NACK response is not expected, inserting a pre-defined reference signal in the duration of symbols designated as RS symbols; if an ACK/NACK response is expected, embedding the ACK/NACK response in one or more of the symbols designated as RS symbols; and transmitting the subframe to a receiver, whereby the receiver can determine the ACK/NACK in the RS symbol, if present, and also use the RS symbol for coherent demodulation of a CQI (channel quality indicator) or data.
7. The method of Claim 6, wherein the RS comprises a base CAZAC-like sequence and embedding the ACK/NACK response comprises: determining a data value for the ACK/NACK response; mapping the data value to a cyclic shift amount; and cyclic shifting the base CAZAC-like sequence by the mapped cyclic shift amount representative of the data value to form a cyclic shifted CAZAC-like sequence.
8. A method for receiving in a wireless cellular network, comprising: receiving a signal at the receiver that includes a transmitted cyclic shifted base signal; determining the shift amount of the transmitted cyclic shifted base signal; and extracting a data value in accordance with the shift amount if a data value is expected; and using the cyclic shifted base signal as a reference signal for coherent demodulation of a data symbol.
9. The method of Claim 8, wherein determining the shift amount comprises: demodulating the received signal with a base CAZAC-like sequence to obtain the estimated channel taps; and estimating the shift amount based on at least one of: a) a location of a maximum channel tap; b) a maximum section energy wherein a length of the CAZAC-like sequence is divided into N sections
10. A user equipment (UE) device for use in a wireless cellular network, comprising: means for forming a subframe with a plurality of symbols with certain symbols designated as reference signal (RS) symbols; means for determining if an ACK/NACK response is expected; means for inserting an RS in the duration of symbols designated as RS symbols if ACK/NACK response is not expected; means for embedding the ACK/NACK response in one or more of the symbols designated as RS symbols if an ACK/NACK response is expected; and means for transmitting the subframe to a receiver, whereby the receiver can determine the ACK/NACK in the RS symbol, if present, and also use the RS symbol for coherent demodulation of a CQI (channel quality indicator) or data
11. The UE of Claim 10, wherein the RS comprises a base CAZAC-like sequence and wherein the means for embedding the ACK/NACK response comprises: means for determining a data value for the ACK/NACK response; means for mapping the data value to a cyclic shift amount; and means for cyclic shifting the base CAZAC-like sequence by the mapped cyclic shift amount representative of the data value to form a cyclic shifted CAZAC-like sequence
12. A receiver for use in a wireless cellular network, comprising: a radio receiver operable to receive a signal that includes a transmitted cyclic shifted base signal; circuitry operable to determine the shift amount of the transmitted cyclic shifted base signal; and circuitry operable to extract a data value in accordance with the shift amount if a data value is expected; and circuitry operable to use the cyclic shifted base signal as a reference signal for coherent demodulation of a data symbol.']
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SUMMARY
ClaimChart-WO2008036977A2-STO
Patent number:WO2008036977A2
Claim Chart Type : SEP Claim Chart
Price: 200 €
Note:
The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.