Reciprocal channel sounding reference signal multiplexing
First Claim
1. A method for communicating with a base station, comprising:
- transmitting, by a user equipment (UE), a sounding reference signal (SRS) during a subframe, the subframe including an uplink period and a downlink period,wherein the SRS is configured using permutation or scrambling in order to avoid collision, wherein the SRS is transmitted using non-orthogonal physical resources via an uplink channel, and wherein the SRS is elongated such that the elongated SRS is transmitted during the uplink period of the subframe and during at least a portion of the downlink period of the subframe; and
receiving, by the UE from the base station, a beamformed downlink communication derived based on information corresponding to the uplink channel obtained from at least the elongated SRS and applied to a downlink channel.
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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 (SRS) to the base station. The base station characterizes the uplink channel based on the SRS received and, using reciprocity, applies the channel characterization for the downlink channel. As part of applying the channel information, the base station forms the beam to the UE based on the uplink channel information obtained from the SRS. The UE may include an array of antennas, each UE transmitting a different SRS that the base station receives and uses to characterize the downlink. Multiple UEs (or a single UE with multiple antennas) transmit SRS at the same time and frequency allocation (non-orthogonal), but with each sending its own unique SRS. Further, multiple UEs (or a single UE with multiple antennas) may send their SRS at unique time/frequency allocations (orthogonal).
11 Citations
13 Claims
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1. A method for communicating with a base station, comprising:
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transmitting, by a user equipment (UE), a sounding reference signal (SRS) during a subframe, the subframe including an uplink period and a downlink period, wherein the SRS is configured using permutation or scrambling in order to avoid collision, wherein the SRS is transmitted using non-orthogonal physical resources via an uplink channel, and wherein the SRS is elongated such that the elongated SRS is transmitted during the uplink period of the subframe and during at least a portion of the downlink period of the subframe; and receiving, by the UE from the base station, a beamformed downlink communication derived based on information corresponding to the uplink channel obtained from at least the elongated SRS and applied to a downlink channel. - View Dependent Claims (2, 3, 4, 5)
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6. A base station, comprising:
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a transceiver configured to receive a sounding reference signal (SRS) from a user equipment (UE) via an uplink channel during a subframe, the subframe including an uplink period and a downlink period, wherein the SRS is elongated such that the elongated SRS is received during the uplink period of the subframe and during at least a portion of the downlink period of the subframe; and a processor configured to obtain information corresponding to the uplink channel from at least the elongated SRS and apply the information to a downlink channel, wherein the transceiver is further configured to transmit a beamformed downlink communication to the UE via the downlink channel based on the information obtained from the elongated SRS. - View Dependent Claims (7, 8, 9, 10)
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11. 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 receive a sounding reference signal (SRS) from a user equipment (UE) via an uplink channel during a subframe, the subframe including an uplink period and a downlink period, wherein the SRS is elongated such that the elongated SRS is received during the uplink period of the subframe and during at least a portion of the downlink period of the subframe; code for causing the base station to obtain information corresponding to the uplink channel from at least the elongated SRS and apply the information to a downlink channel; and code for causing the base station to transmit a beamformed downlink communication to the UE via the downlink channel based on the information obtained from the elongated SRS. - View Dependent Claims (12, 13)
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Specification