# US 2018/0062709 A1 · Tiered control of iterative mimo receivers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0062709 A1 - Document ID: US20180062709A1 - Status: Published application - Kind: A1 - Application number: 15/684,685 - Filed: 2017-08-23 - Published: 2018-03-01 - Earliest claimed: 2016-08-26 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Chinmay VAZE; Prashant Udupa SRIPATHI; Supratik BHATTACHARJEE; Michael MCCLOUD - Web page: https://patentgrep.com/patent/US20180062709A1 ## CPC - H04B 7/0413: MIMO systems - H04B 7/08: at the receiving station - H04B 17/29: Performance testing - H04L 1/005: {Iterative decoding, including iteration between signal detection and decoding operation} - H04L 25/03006: {Arrangements for removing intersymbol interference} - H04L 2025/03732: {according to the convergence state} - H04L 2025/03764: {only during predefined intervals} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract In order to balance the power requirements of a MIMO receiver with the gains that may be achieved through its use, an apparatus determines whether a current configuration of the UE supports iterative MIMO reception. When it is determined that the current configuration of the UE supports iterative MIMO reception, the apparatus determines whether at least one parameter of the received signal is within a corresponding target condition, respectively, for each of the at least one parameters, e.g., including determining whether a scheduling percentage meets a scheduling threshold and whether an error rate is within an error rate range. When both the configuration supports iterative MIMO reception and the signal parameter(s) meet the corresponding target condition(s), the apparatus uses the iterative MIMO receiver. If not, the apparatus uses a serial receiver. ## Claims ### Claim 1 A method of wireless communication for performing tiered control of an iterative Multiple-Input Multiple-Output (MIMO) receiver at a user equipment (UE), comprising: determining whether a current configuration of the UE supports iterative MIMO reception; and when it is determined that the current configuration of the UE supports iterative MIMO reception, determining whether at least one parameter of the received signal is within a corresponding target condition, respectively, for each of the at least one parameters. ### Claim 2 (depends on 1) The method of claim 1, wherein when it is determined that the current configuration of the UE does not support iterative MIMO, the method includes receiving a signal using serial reception. ### Claim 3 (depends on 1) The method of claim 1, wherein when it is determined that the at least one parameter of the received signal is not within a corresponding target condition, the method includes receiving a signal using serial reception. ### Claim 4 (depends on 1) The method of claim 1, wherein determining whether at least one parameter of the received signal is within the corresponding target condition comprises determining whether a percentage of scheduling is above a first threshold. ### Claim 5 (depends on 4) The method of claim 4, wherein determining whether at least one parameter of the received signal is within the corresponding target condition comprises determining whether an error rate is within a target range. ### Claim 6 (depends on 5) The method of claim 5, wherein the received signal comprises multiple streams, and the method further comprises determining whether the error rate is within the target range individually for each of the multiple streams, and wherein if the error rate for at least one of the multiple streams is within the target range, the iterative MIMO receiver is used. ### Claim 7 (depends on 5) The method of claim 5, further comprising: determining whether a difference between a first error rate at a first iteration and an overall error rate meets an error rate change threshold, using the iterative MIMO receiver when the difference meets the error rate change threshold and using a serial receiver when the difference does not meet the error rate change threshold. ### Claim 8 (depends on 1) The method of claim 1, further comprising: transitioning between iterative MIMO reception and serial reception depending on a periodic determination of whether at least one parameter of the received signal is within the corresponding target condition. ### Claim 9 (depends on 1) The method of claim 1, wherein the determination of whether the current configuration of the UE supports iterative MIMO reception is based on at least one of a number of reception antennas, a transmission mode, and a call type. ### Claim 10 (depends on 1) The method of claim 1, wherein an updated determination of whether the current configuration of the UE supports iterative MIMO reception is repeated when the current configuration of the UE changes. ### Claim 11 An apparatus for wireless communication for performing tiered control of an iterative Multiple-Input Multiple-Output (MIMO) receiver at a user equipment (UE), comprising: means for determining whether a current configuration of the UE supports iterative MIMO reception; and means for determining whether at least one parameter of the received signal is within a corresponding target condition, respectively, for each of the at least one parameters, when it is determined that the current configuration of the UE supports iterative MIMO reception. ### Claim 12 (depends on 11) The apparatus of claim 11, further comprising: means for receiving a signal using serial reception, when it is determined that the current configuration of the UE does not support iterative MIMO or that the at least one parameter of the received signal is not within a corresponding target condition, the method includes receiving a signal using serial reception. ### Claim 13 (depends on 11) The apparatus of claim 11, wherein the means for determining whether at least one parameter of the received signal is within the corresponding target condition comprises: means for determining whether a percentage of scheduling is above a first threshold. ### Claim 14 (depends on 11) The apparatus of claim 11, wherein the means for determining whether at least one parameter of the received signal is within the corresponding target condition comprises: means for determining whether an error rate is within a target range. ### Claim 15 (depends on 14) The apparatus of claim 14, further comprising: means for determining whether a difference between a first error rate at a first iteration and an overall error rate meets an error rate change threshold, wherein the iterative MIMO receiver is used when the difference meets the error rate change threshold and a serial receiver is used when the difference does not meet the error rate change threshold. ### Claim 16 (depends on 11) The apparatus of claim 11, further comprising: means for transitioning between iterative MIMO reception and serial reception depending on a periodic determination of whether at least one parameter of the received signal is within the corresponding target condition. ### Claim 17 An apparatus for wireless communication for performing tiered control of an iterative Multiple-Input Multiple-Output (MIMO) receiver at a user equipment (UE), comprising: a memory; and at least one processor coupled to the memory and configured to: determine whether a current configuration of the UE supports iterative MIMO reception; and when it is determined that the current configuration of the UE supports iterative MIMO reception, determine whether at least one parameter of the received signal is within a corresponding target condition, respectively, for each of the at least one parameters. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein determining whether at least one parameter of the received signal is within the corresponding target condition comprises determining whether a percentage of scheduling is above a first threshold. ### Claim 19 (depends on 17) The apparatus of claim 17, wherein determining whether at least one parameter of the received signal is within the corresponding target condition comprises determining whether an error rate is within a target range. ### Claim 20 (depends on 19) The apparatus of claim 19, wherein the received signal comprises multiple streams, and the at least one processor is further configured to determine whether the error rate is within the target range individually for each of the multiple streams, and wherein if the error rate for at least one of the multiple streams is within the target range, the iterative MIMO receiver is used. ### Claim 21 (depends on 19) The apparatus of claim 19, wherein the at least one processor is further configured to: determine whether a difference between a first error rate at a first iteration and an overall error rate meets an error rate change threshold; use the iterative MIMO receiver when the difference meets the error rate change threshold; and use a serial receiver when the difference does not meet the error rate change threshold. ### Claim 22 (depends on 17) The apparatus of claim 17, wherein the at least one processor is further configured to: transition between iterative MIMO reception and serial reception depending on a periodic determination of whether at least one parameter of the received signal is within the corresponding target condition. ### Claim 23 A computer-readable medium storing computer executable code for performing tiered control of an iterative Multiple-Input Multiple-Output (MIMO) receiver at a user equipment (UE), comprising code to: determine whether a current configuration of the UE supports iterative MIMO reception; and when it is determined that the current configuration of the UE supports iterative MIMO reception, determine whether at least one parameter of the received signal is within a corresponding target condition, respectively, for each of the at least one parameters. ### Claim 24 (depends on 23) The computer-readable medium of claim 23, wherein determining whether at least one parameter of the received signal is within the corresponding target condition comprises determining whether a percentage of scheduling is above a first threshold. ### Claim 25 (depends on 23) The computer-readable medium of claim 23, wherein determining whether at least one parameter of the received signal is within the corresponding target condition comprises determining whether an error rate is within a target range. ### Claim 26 (depends on 25) The computer-readable medium of claim 25, wherein the received signal comprises multiple streams, the computer-readable medium further comprising code to: determine whether the error rate is within the target range individually for each of the multiple streams, and wherein if the error rate for at least one of the multiple streams is within the target range, the iterative MIMO receiver is used. ### Claim 27 (depends on 25) The computer-readable medium of claim 25, further comprising code to: determine whether a difference between a first error rate at a first iteration and an overall error rate meets an error rate change threshold, use the iterative MIMO receiver when the difference meets the error rate change threshold and use a serial receiver when the difference does not meet the error rate change threshold. ### Claim 28 (depends on 23) The computer-readable medium of claim 23, further comprising code to: transition between iterative MIMO reception and serial reception depending on a periodic determination of whether at least one parameter of the received signal is within the corresponding target condition.