Reciprocal channel sounding reference signal allocation and configuration
First Claim
1. A method of wireless communication, comprising:
- determining, at a user equipment (UE), channel correlation information for a channel between the UE and a base station;
receiving, at the UE, a sounding reference signal (SRS) instruction indicating a defined periodicity of transmission for an SRS based on the channel correlation information; and
transmitting, from the UE, the SRS in accordance with the defined periodicity.
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Accused Products
Abstract
Systems and techniques are disclosed to enhance the efficiency of available bandwidth between UEs and base stations. A UE transmits a sounding reference signal to the base station, which characterizes the uplink channel based on the SRS received and, using reciprocity, applies the channel characterization for the downlink channel. The base station may form the beam to the UE based on the uplink channel information obtained from the SRS. As the downlink channel changes the base station needs updated information to maintain its beamforming, meaning it needs a new SRS. Transmission of the SRS takes resources; to minimize this, the UE or the base station can determine a period during which the downlink channel will predictably remain coherent and set up a schedule for sending SRS. Alternatively, the UE or the base station can determine on demand that the channel is losing coherence and initiate an on demand SRS.
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Citations
40 Claims
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1. A method of wireless communication, comprising:
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determining, at a user equipment (UE), channel correlation information for a channel between the UE and a base station; receiving, at the UE, a sounding reference signal (SRS) instruction indicating a defined periodicity of transmission for an SRS based on the channel correlation information; and transmitting, from the UE, the SRS in accordance with the defined periodicity. - View Dependent Claims (2, 3, 4)
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5. A method of wireless communication, comprising:
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determining, at a base station, channel correlation information for a channel between the base station and a user equipment (UE), wherein the channel correlation information indicates an aperiodic decrease in channel correlation; transmitting, from the base station, a request for a sounding reference signal (SRS) from the UE based on the determined channel correlation information; receiving, at the base station, the requested SRS; and training, at the base station, beamforming to the UE based on the received SRS.
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6. A method of wireless communication, comprising:
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determining, at a user equipment (UE), a processing gain (PG) to communicate with a base station; receiving, at the UE, a sounding reference signal (SRS) transmission instruction to transmit an SRS with a minimum length based on the determined PG; and broadcasting, from the UE to the base station, the SRS having at least the minimum length. - View Dependent Claims (7, 8, 9)
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10. A method of wireless communication, comprising:
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determining, at a base station, a processing gain (PG) to communicate with a user equipment (UE) based on channel condition information; determining, at the base station, resources to send a sounding reference signal (SRS) with at least a minimum length of time for the SRS based on the determined PG; and transmitting, from the base station, a request to the UE for the SRS having at least the minimum length based on the determined resources. - View Dependent Claims (11, 12, 13)
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14. A user equipment (UE), comprising:
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a processor configured to; determine channel correlation information for a channel between the UE and a base station; and
/ordetermine a processing gain (PG) to communicate with the base station; and a transceiver in communication with the processor, the transceiver configured to; receive a sounding reference signal (SRS) instruction, the SRS instruction indicating a defined periodicity of transmitting for an SRS based on the channel correlation information and/or an instruction to transmit the SRS with a minimum length based on the determined PG; and transmit the SRS to the base station based on the defined periodicity for the SRS and/or the determined minimum length of the SRS. - View Dependent Claims (15, 16, 17, 18, 19, 20, 22, 24, 25, 26, 27)
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21. A base station, comprising:
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a processor configured to; determine channel correlation information for a channel between the base station and a user equipment (UE); and
/ordetermine a processing gain (PG) to communicate with a user equipment (UE) based on channel condition information and determine resources to send a sounding reference signal (SRS) with at least a minimum length based on the determined PG; and a transceiver in communication with the processer, the transceiver configured to; transmit a request for the SRS to the UE based on the determined channel correlation information and/or the determined minimum length of the SRS based on the determined resources; and receive the requested SRS from the UE, wherein the base station is further configured to beamform to the UE based on the received SRS. - View Dependent Claims (23)
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28. A non-transitory computer-readable medium having program code recorded thereon, the program code comprising:
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code for causing a user equipment (UE) to determine channel correlation information for a channel between the UE and a base station and receive a sounding reference signal (SRS) instruction, the SRS instruction indicating a defined a periodicity of transmission for an SRS based on the channel correlation information; and
/orcode for causing the UE to determine a processing gain (PG) to communicate with the base station and receive an SRS transmission instruction to transmit the SRS with a minimum length based on the determined PG; and code for causing the UE to transmit the SRS in accordance with the defined periodicity and/or having at least the minimum length. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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35. A non-transitory computer-readable medium having program code recorded thereon, the program code comprising:
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code for causing a base station to determine channel correlation information for a channel between the base station and a user equipment (UE); code for causing the base station to determine a processing gain (PG) to communicate with the UE based on channel condition information and determine resources to send a sounding reference signal (SRS) with at least a minimum length of time based on the determined PG; and code for causing the base station to transmit a request for the SRS having the minimum length from the UE based on the determined channel correlation information and the determined resources. - View Dependent Claims (36, 37, 38, 39, 40)
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Specification