ADAPTING COMMUNICATION PARAMETERS TO ACCOMMODATE SRS SUSPENSION FOR A MULTI-SIM / eSIM WIRELESS DEVICE
By adapting communication parameters to suspend SRS transmission and adjust network settings, multi-SIM/eSIM devices maintain efficient communication across multiple networks, addressing interruptions and improving resource utilization and throughput.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2026-03-12
AI Technical Summary
Multi-SIM/eSIM wireless devices face challenges in optimizing resource usage and performance due to interruptions in sounding reference signal (SRS) transmission when monitoring for paging messages from multiple cellular networks, leading to inefficiencies in uplink and downlink communication.
Adapting communication parameters by periodically suspending SRS transmission for a default data subscription SIM/eSIM profile to allow monitoring for paging messages from another network, with the network base station detecting SRS interruptions and adjusting parameters accordingly to maintain communication quality.
Enhances network resource usage and throughput performance by compensating for SRS interruptions, ensuring seamless communication across multiple networks without significant degradation.
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Figure CN2024116775_12032026_PF_FP_ABST
Abstract
Description
ADAPTING COMMUNICATION PARAMETERS TO ACCOMMODATE SRS SUSPENSION FOR A MULTI-SIM / eSIMWIRELESS DEVICEFIELD
[0001] The described embodiments relate to wireless communications, including methods and apparatus for adapting communication parameters of a device that includes multiple subscriber identity modules (SIMs) and / or electronic SIMs (eSIMs) during select scenarios. A multi-SIM / eSIM wireless device can include at least two SIM / eSIM profiles that each provide access to cellular wireless services; however, hardware resources of the multi-SIM / eSIM wireless device may be limited and shared among two distinct SIM / eSIM profiles associated with different cellular wireless networks. A network base station associated with a first SIM / eSIM profile can adapt communication parameters to improve network resource usage and throughput performance on a cellular wireless access link to accommodate interruptions in sounding reference signal (SRS) transmission by the multi-SIM / eSIM wireless device.BACKGROUND
[0002] Newer generation, fifth generation (5G) , cellular wireless networks that implement one or more 3rd Generation Partnership Project (3GPP) standards are rapidly being developed and deployed by mobile network operators (MNOs) worldwide. In addition, sixth generation (6G) standards are in active development. The newer cellular wireless networks provide a range of packet-based services, with 5G (and 6G) technology providing increased data throughput and lower latency connections that promise enhanced mobile broadband services for 5G-capable (and 6G-capable) wireless devices. Access to cellular services provided by an MNO can require use to cellular credentials and / or secure processing provided by a secure element (SE) , such as a universal integrated circuit card (UICC) , an embedded UICC (eUICC) , or an integrated UICC (iUICC) included in the wireless device.
[0003] Typically, wireless devices have been configured to use removable UICCs, that include at least a microprocessor and a read-only memory (ROM) , where the ROM is configured to store an MNO profile, also referred to as subscriber identity module (SIM) or SIM profile, which the wireless device can use to register and interact with an MNO to obtain wireless services via a cellular wireless network. The SIM profile hosts subscriber data, such as a digital identity and one or more cryptographic keys, to allow the wireless device to communicate with a cellular wireless network. Typically, a UICC takes the form of a small removable card, commonly referred to as a SIM card or physical SIM (pSIM) card, which can be inserted into a UICC-receiving bay of a mobile wireless device. In more recent implementations, UICCs are being embedded directly into system boards of wireless devices as eUICCs or integrated with other system components as iUICCs, which can provide advantages over traditional, removable UICCs. The eUICCs and / or iUICCs can include a rewritable memory that can facilitate installation, modification, and / or deletion of one or more electronic SIMs (eSIMs) on the eUICC / iUICC, where the eSIMs can provide for new and / or different services and / or updates for accessing extended features provided by MNOs. An eUICC / iUICC can store a number of MNO profiles-also referred to herein as eSIMs-and can eliminate the need to include UICC-receiving bays in wireless devices. The use of multiple SIMs and / or eSIMs is expected to offer flexibility for access to multiple services of multiple wireless networks.
[0004] A multi-SIM / eSIM wireless device can register for access to wireless services of two different cellular wireless networks using two different SIMs / eSIMs in parallel. The wireless circuitry of the multi-SIM / eSIM wireless device can limit configuration of a cellular wireless modem in the multi-SIM / eSIM wireless device to allow full communication with a cellular wireless network associated with one SIM / eSIM at a time. The wireless circuitry of the multi-SIM / eSIM wireless device can be shared intermittently with a second SIM / eSIM to monitor for signals from a second cellular wireless network, which can interrupt communication with a first cellular wireless network associated with a first SIM / eSIM. There is a need to adapt communication parameters to improve resource usage and performance on a cellular wireless access link to accommodate interruptions in communication by the multi-SIM / eSIM wireless device.SUMMARY
[0005] The described embodiments relate to wireless communications, including methods and apparatus for adapting communication parameters of a device that includes multiple subscriber identity modules (SIMs) and / or electronic SIMs (eSIMs) during select scenarios. A multi-SIM / eSIM wireless device can include two SIM / eSIM profiles that each provide access to cellular wireless services, where a first SIM / eSIM profile can be designated as a default data subscription (DDS) SIM / eSIM profile and a second SIM / eSIM profile can be designated as a non-DDS SIM / eSIM profile. The hardware resources of the multi-SIM / eSIM wireless device may be limited and shared among the DDS SIM / eSIM profile and the non-DDS SIM / eSIM profile, each of which can be associated with different cellular wireless networks. When the DDS SIM / eSIM profile is used for an active data connection with a first cellular wireless network, communication of a sounding reference signal (SRS) for the DDS SIM / eSIM profile can be suspended periodically to allow the non-DDS SIM / eSIM profile to monitor for paging messages from a second cellular wireless network. In some embodiments, the DDS SIM / eSIM profile connection with the first cellular wireless network uses multiple parallel streams via multiple antennas to communicate in the SRS in the uplink direction to estimate the channel and determine communication parameters for the downlink direction. At least some of the multiple antennas can be allocated periodically by the multi-SIM / eSIM wireless device to the non-DDS SIM / eSIM profile to monitor for paging messages according to a paging cycle for the second cellular wireless network. Switching the antennas of the multi-SIM / eSIM wireless device from use by the DDS SIM / eSIM profile to the non-DDS SIM / eSIM profile can interfere with uplink transmission of the SRS to the first cellular wireless network. In some embodiments, a network base station of the first cellular wireless network accumulates an SRS sequence of multiple repetitions of the SRS received from the multi-SIM / eSIM wireless device and determines whether the SRS sequence includes a repeated pattern of errant SRS at periodical intervals indicating gaps in the uplink SRS transmission from the multi-SIM / eSIM wireless device. The network base station can determine characteristics of the repeated pattern to predict a time duration and periodic interval spacing of gaps in the uplink SRS and adapt communication parameters for downlink and / or uplink accordingly. In some embodiments, the network base station disallows scheduling of higher rank downlink data to the multi-SIM / eSIM wireless device during predicted gaps in uplink SRS transmission. In some embodiments, the network base station measures signal quality values for SRS instances received via different parallel antenna ports. When the signal quality for the SRS via an antenna port does not satisfy an SRS quality criterion, the network base station can exclude one or more SRS instances that were most recently from being used for channel estimation and re-use previously received SRS instances instead for the channel estimation.
[0006] Other aspects and advantages of the invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the described embodiments.
[0007] This Summary is provided merely for purposes of summarizing some example embodiments so as to provide a basic understanding of some aspects of the subject matter described herein. Accordingly, it will be appreciated that the above-described features are merely examples and should not be construed to narrow the scope or spirit of the subject matter described herein in any way. Other features, aspects, and advantages of the subject matter described herein will become apparent from the following Detailed Description, Figures, and Claims.BRIEF DESCRIPTION OF THE DRAWINGS
[0008] The disclosure will be readily understood by the following detailed description in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements.
[0009] FIG. 1 illustrates a block diagram of different components of an exemplary system configured to adapt communication parameters for a wireless device, according to some embodiments.
[0010] FIG. 2 illustrates a block diagram of a more detailed view of exemplary components of a mobile wireless device of the system of FIG. 1, according to some embodiments.
[0011] FIG. 3A illustrates a block diagram of an exemplary dual SIM wireless device in communication with two different wireless networks, according to some embodiments.
[0012] FIG. 3B illustrates block diagrams of exemplary multi-SIM and multi-SIM / eSIM wireless devices, according to some embodiments.
[0013] FIG. 4A illustrates a block diagram of an exemplary dual SIM dual active (DSDA) wireless device, according to some embodiments.
[0014] FIG. 4B illustrates block diagrams of exemplary dual SIM dual standby (DSDS) wireless devices, according to some embodiments.
[0015] FIG. 5A illustrates block diagrams of an exemplary multiple-input multiple-output (MIMO) communication channel between a base station and a wireless device, according to some embodiments.
[0016] FIG. 5B illustrates block diagrams of exemplary power density for an uplink sounding reference signal (SRS) , according to some embodiments.
[0017] FIG. 6A illustrates a diagram of communication states for a multi-SIM / eSIM wireless device and a network base station that includes an interruption in uplink SRS transmission impacting downlink MIMO communication, according to some embodiments.
[0018] FIGS. 6B, 6C, and 6D illustrate diagrams of communication states for a multi-SIM / eSIM wireless device and a network base station that includes an interruption in uplink SRS transmission with different compensating adaptions of communication parameters by the network base station, according to some embodiments.
[0019] FIG. 7A illustrates a flow diagram of an exemplary technique to adapt communication parameters to accommodate suspension of an uplink SRS transmission, according to some embodiments.
[0020] FIG. 7B illustrates a flow diagram of another exemplary technique to adapt communication parameters to accommodate suspension of an uplink SRS transmission, according to some embodiments.
[0021] FIG. 8 illustrates a flow chart of an exemplary method to adapt communication parameters to accommodate suspension of an uplink SRS transmission, according to some embodiments.
[0022] FIG. 9 illustrates a flow chart of another exemplary method to adapt communication parameters to accommodate suspension of an uplink SRS transmission, according to some embodiments.
[0023] FIG. 10 illustrates a block diagram of exemplary elements of a wireless device, according to some embodiments.DETAILED DESCRIPTION
[0024] Representative applications of methods and apparatus according to the present application are described in this section. These examples are being provided solely to add context and aid in the understanding of the described embodiments. It will thus be apparent to one skilled in the art that the described embodiments may be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order to avoid unnecessarily obscuring the described embodiments. Other applications are possible, such that the following examples should not be taken as limiting.
[0025] The described embodiments relate to wireless communications, including methods and apparatus for adapting communication parameters of a device that includes multiple subscriber identity modules (SIMs) and / or electronic SIMs (eSIMs) during select scenarios. A multi-SIM / eSIM wireless device can include two SIM / eSIM profiles that each provide access to cellular wireless services, where a first SIM / eSIM profile can be designated as a default data subscription (DDS) SIM / eSIM profile and a second SIM / eSIM profile can be designated as a non-DDS SIM / eSIM profile. The DDS SIM / eSIM profile can be used for data communication with a first cellular wireless network, while the non-DDS SIM / eSIM profile can be used for non-data communication with a second cellular wireless network. The hardware resources of the multi-SIM / eSIM wireless device may be limited and shared among the DDS SIM / eSIM profile and the non-DDS SIM / eSIM profile, each of which can be associated with different cellular wireless networks. When the DDS SIM / eSIM profile is used for an active data connection with the first cellular wireless network, the multi-SIM / eSIM wireless device can interrupt the active data connection periodically to monitor for paging messages from the second cellular wireless network.
[0026] Communication between a network base station of the first cellular wireless network and the multi-SIM / eSIM wireless device can be configured to use multiple parallel streams, e.g., for multiple-input multiple-output (MIMO) communication. For a time-division duplex (TDD) configuration in which the same frequency region is used in both the uplink and downlink directions, the network base station can estimate the communication channel between the network base station and the multi-SIM / eSIM wireless device using a sounding reference signal (SRS) transmitted in the uplink direction via multiple antennas of the multi-SIM / eSIM wireless device and received via multiple antenna ports of the network base station. Communication of the uplink SRS for the DDS SIM / eSIM profile via multiple antennas can be suspended periodically to allow the non-DDS SIM / eSIM profile to monitor for paging messages from a second cellular wireless network via at least some of the multiple antennas of the multi-SIM / eSIM wireless device, i.e., some of the antennas are re-allocated from the DDS SIM / eSIM profile to the non-DDS SIM / eSIM profile. The periodicity of the paging cycle of the second cellular wireless network can be independent of the periodicity of transmission of the SRS for the first cellular wireless network. At least some of the multiple antennas can be allocated periodically by the multi-SIM / eSIM wireless device to the non-DDS SIM / eSIM profile to monitor for paging messages according to a paging cycle for the second cellular wireless network. Switching the antennas of the multi-SIM / eSIM wireless device from use by the DDS SIM / eSIM profile to the non- DDS SIM / eSIM profile can interfere with uplink transmission of the SRS to the first cellular wireless network. To compensate for this interruption, the network base station can monitor for SRS interruption and / or changes in SRS quality and change communication parameters for downlink and / or uplink communication with the multi-SIM / eSIM wireless device accordingly.
[0027] The network base station of the first cellular wireless network can accumulate an SRS sequence that includes multiple repetitions of the SRS received from the multi-SIM / eSIM wireless device. The network base station can examine the SRS sequence and determine whether the SRS sequence includes a repeated pattern of errant SRS at periodical intervals, which can indicate gaps in the uplink SRS transmission from the multi-SIM / eSIM wireless device to the network base station. The network base station can determine characteristics of the repeated pattern of errant SRS to predict a time duration and periodic interval spacing of gaps in the uplink SRS and adapt communication parameters for downlink and / or uplink communication with the multi-SIM / eSIM wireless device accordingly. In some embodiments, the network base station disallows scheduling of higher rank downlink data to the multi-SIM / eSIM wireless device during predicted gaps in uplink SRS transmission, as the network base station can assume that the multi-SIM / eSIM wireless device cannot receive the higher rank downlink data during time periods when at least some of the antennas of the multi-SIM / eSIM wireless device are re-allocated for another purpose, e.g., to monitor for paging from another cellular wireless network. In some embodiments, the network base station measures signal quality values for SRS instances received via different parallel antenna ports. When the signal quality for the SRS via an antenna port does not satisfy an SRS quality criterion, the network base station can exclude one or more SRS instances that were most recently from being used for channel estimation and re-use previously received SRS instances instead for the channel estimation.
[0028] These and other embodiments are discussed below with reference to FIGS. 1 through 10; however, those skilled in the art will readily appreciate that the detailed description given herein with respect to these figures is for explanatory purposes only and should not be construed as limiting.
[0029] FIG. 1 illustrates a block diagram of different components of a system 100 that includes i) a wireless device 102, which can also be referred to as a mobile wireless device, a cellular wireless device, a wireless communication device, a mobile device, a user equipment (UE) , a device, a primary wireless device, a secondary wireless device, an accessory wireless device, a cellular-capable wearable device, and the like, ii) a group of base stations 112-1 to 112-N, which are managed by different Mobile Network Operators (MNOs) 114, and iii) a set of provisioning servers 116 that are in communication with the MNOs 114. The wireless device 102 can represent a mobile computing device (e.g., a phone, a tablet, a peripheral device, etc. ) , the base stations 112-1 to 112-N can represent cellular radio access network (RAN) entities including fourth generation (4G) Long Term Evolution (LTE) evolved NodeBs (eNodeBs or eNBs) , fifth generation (5G) NodeBs (gNodeBs or gNBs) , and / or sixth generation (6G) NodeBs that are configured to communicate with the wireless device 102. Each of the base stations 112-1 to 112-n can be a single entity, quasi-collocated entities, or separated among multiple units (e.g., Central Units (CUs) , Distributed Units (DUs) , Remote Units (RUs) ) . The MNOs 114 can represent different wireless service providers that provide specific services (e.g., voice, data, video, messaging) to which a user of the wireless device 102 can subscribe to access the services via the wireless device 102. Applications resident on the wireless device 102 can advantageously access services of a cellular wireless network provided by a wireless service provider using 4G LTE connections, 5G connections, and / or 6G connections (when available) via one or more base stations 112.
[0030] As shown in FIG. 1, the wireless device 102 can include processing circuitry, which can include one or more processors 104 and a memory 106, an embedded Universal Integrated Circuit Card (eUICC) 108, and / or integrated UICC (iUICC) (not shown) and baseband component 110 used for transmission and reception of cellular wireless radio frequency signals. In some embodiments, the wireless device 102 can include one or more universal integrated circuit cards (UICCs) 118, also referred to as physical SIM cards, each UICC 118 including a SIM, in addition to or in place of the eUICC 108 providing one or more electronic SIMs (eSIMs) and / or an iUICC providing one or more eSIMs. A wireless device 102 that includes multiple active (enabled) SIMs and / or eSIMs can be referred to generally herein as a multi-SIM / eSIM wireless device. The one or more processors 104 can include one or more wireless processors, such as a cellular baseband component, a wireless local area network processor, a wireless personal area network processor, a near-field communication processor, and one or more system-level application processors. The components of the wireless device 102 work together to enable the wireless device 102 to provide useful features to a user of the wireless device 102, such as cellular wireless network access, non-cellular wireless network access, localized computing, location-based services, and Internet connectivity. Although depicted as distinct blocks, the various components (e.g., memory 106, processor (s) 104, eUICC 108, baseband component 110, and UICC 118) can be arranged and combined in any number of configurations.
[0031] The eUICC 108 can be configured to store multiple eSIMs for accessing services offered by one or more different MNOs 114 via communication through base stations 112-1 to 112-N. To be able to access services provided by the MNOs, one or more eSIMs can be provisioned to the eUICC 108 of the wireless device 102. The wireless device 102 can include wireless circuitry, including the baseband component 110 and at least one transmitter / receiver, also referred to as a transceiver. In some embodiments, the wireless device 102 includes two or more transceivers. In some embodiments, the wireless device 102 can be configured to operate in a dual SIM, dual standby (DSDS) mode, with two SIMs, one SIM and one eSIM, or two eSIMs enabled and active simultaneously, but allowing active connections to only one cellular wireless network via a single, active transceiver at a time. In some embodiments, the transceiver of the wireless device 102 includes multiple receivers to allow reception of signals from multiple wireless networks and only one transmitter for transmitting signals to one of the multiple wireless networks at a time. In some embodiments, the baseband component 110 is communicatively coupled to multiple antennas to allow for multiple-input multiple-output (MIMO) communication between the wireless device 102 and a network base station 112.
[0032] FIG. 2 illustrates a block diagram 200 of a more detailed view of exemplary components of a wireless device 102 of the system 100 of FIG. 1. The one or more processors 104, in conjunction with the memory 106, can implement a main operating system (OS) 202 that is configured to execute applications 204 (e.g., native OS applications and user applications) . The one or more processors 104 can include applications processing circuitry and, in some embodiments, wireless communications control circuitry. The applications processing circuitry can monitor application requirements and usage to determine recommendations about communication connection properties, such as bandwidth and / or latency, and provide information to the communications control circuitry to determine suitable wireless connections for use by particular applications. The communications control circuitry can process information from the applications processing circuitry as well as from additional circuitry, such as the baseband component 110, and other sensors (not shown) to determine states of components of the wireless device 102, e.g., reduced power modes, as well as of the wireless device 102 as a whole, e.g., mobility states, activity / inactivity states. The wireless device 102 further includes an eUICC 108 that can be configured to implement an eUICC OS 206 to manage the hardware resources of the eUICC 108 (e.g., a processor and a memory embedded in the eUICC 108) . The eUICC OS 206 can also be configured to manage eSIMs 208 that are stored by the eUICC 108, e.g., by enabling, disabling, modifying, updating, or otherwise performing management of the eSIMs 208 within the eUICC 108 and providing the baseband component 110 with access to the eSIMs 208 to provide access to wireless services for the wireless device 102. The eUICC OS 206 can include an eSIM manager 210, which can perform management functions for various eSIMs 208. Each eSIM 208 can include a number of applets 212 that define the manner in which the eSIM 208 operates. For example, one or more of the applets 212, when implemented by the baseband component 110 and the eUICC 108, can be configured to enable the wireless device 102 to communicate with an MNO 114 and provide useful features (e.g., phone calls and internet) to a user of the wireless device 102.
[0033] The baseband component 110 of the wireless device 102 can include a baseband OS 214 that is configured to manage hardware resources of the baseband component 110 (e.g., a processor, a memory, different radio components, etc. ) . The baseband component 110 (or a portion thereof) can also be referred to as a baseband component, a wireless baseband component, a baseband wireless processor, a cellular baseband component, a cellular component, and the like. According to some embodiments, the baseband component 110 can implement a baseband manager 216 that is configured to interface with the eUICC 108 to establish a secure channel with a provisioning server 116 and obtain information (such as eSIM data) from the provisioning server 116 for purposes of managing eSIMs 208. The baseband manager 216 can be configured to implement services 218, which represent a collection of software modules that are instantiated by way of the various applets 212 of enabled eSIMs 208 that are included in the eUICC 108. For example, services 218 can be configured to manage different connections between the wireless device 102 and MNOs 114 according to the different eSIMs 208 that are enabled within the eUICC 108.
[0034] FIG. 3A illustrates a block diagram 300 of components of an exemplary dual SIM wireless device 302 including one or more processor (s) 104 and wireless circuitry 308 that provides for wireless radio frequency (RF) connections between the dual SIM wireless device 302 and a first wireless network 310A and a second wireless network 310B. In some embodiments, the wireless circuitry 308 can include the baseband component 110, and a set of RF analog front-end circuitry. In some embodiments, the wireless circuitry 308 and / or a portion thereof can include or be referred to as a wireless transmitter / receiver or a transceiver or a radio. The terms circuit, circuitry, component, and component block may be used interchangeably herein, in some embodiments, to refer to one or more operational units of a wireless device that process and / or operate on digital signals, analog signals, or digital data units used for wireless communication. For example, representative circuits can perform various functions that convert digital data units to transmitted radio frequency analog waveforms and / or convert received analog waveforms into digital data units including intermediate analog forms and intermediate digital forms. The wireless circuitry 308 can include components of RF analog front-end circuitry, e.g., a set of one or more antennas, which can be interconnected with additional supporting RF circuitry that can include filters and other analog components that can be “configured” for transmission and / or reception of analog signals via one or more corresponding antennas to one or more of the first and second wireless networks 310A / B. The processor (s) 104 and the wireless circuitry 308 can be configured to perform and / or control performance of one or more functionalities of the dual SIM wireless device 302, in accordance with various implementations. The processor (s) 104 and the wireless circuitry 308 can provide functionality for coordinating hardware / software resources in the dual SIM wireless device 302 to improve performance for mobility management of connections to one or more of the wireless networks 310A / B.
[0035] The dual SIM wireless device 302 includes two removable UICCs 118A / B, which can be inserted and removed from the dual SIM wireless device 302 together or independently. Each UICC 118A / B includes at least one software identity module (SIM) , which can be embodied as a software / firmware program installed on the UICC 118A / B. Removable UICCs 118A / B can provide a user of the dual SIM wireless device 302 the ability to replace a UICC to change services, provided the dual SIM wireless device 302 supports such flexibility (e.g., an “unlocked” device that is not “locked” to a particular wireless network operator or service provider) . Hardware complexity and / or a size of a wireless device can limit the ability to include multiple UICC slots, and thus additional arrangements for wireless devices are can include multiple SIMs on a single UICC 118 and / or eSIMs 208 on an eUICC 108 or combinations thereof. The dual SIM wireless device 302, in some embodiments, can register with two different wireless networks, e.g., the first and second wireless networks 310A / B, simultaneously. The first wireless network 310A can operate in accordance with a first wireless communication protocol, e.g., a 5G NR wireless communication protocol, while the second wireless network 310B can operate with a second wireless communication protocol that can be the same as the first wireless communication protocol or a different wireless communication protocol, e.g., a 4G LTE wireless communication protocol. The first and second wireless networks 310A / B can operate using different radio frequency bands in accordance with their respective wireless communication protocols. The first and second wireless network 310A / B can operate using different radio frequency bands of a common wireless communication protocol, e.g., using an FR1 RF band and an FR2 band of a 5G NR wireless communication protocol. The wireless circuitry 308 of the dual SIM wireless device 302 can be configured to register with and / or establish a connection with the first wireless network 310A via access network equipment 312A, which interfaces with a core network 314A. The wireless circuitry 308 of the dual SIM wireless device 302 can also be configured to register with and / or establish a connection with the second wireless network 310B via access network equipment 312B, which interfaces with a core network 314B. In some embodiments, the wireless circuitry 308 of the dual SIM wireless device 302 supports transmission and reception to only one of the first and second wireless networks 310A / B at a time. In some embodiments, the wireless circuitry 308 of the dual SIM wireless device 302 supports transmission to only one of the first and second wireless networks 310A / B at a time and reception from one or both of the first and second wireless networks 310A / B. A dual SIM wireless device 302 that can connect to only one wireless network at a time, but can monitor and / or receive communication from two wireless networks with which it is registered, can be referred to as a “Dual SIM, Dual Standby” (DSDS) wireless device. A dual SIM wireless device 302 that can connect to two wireless networks simultaneously using two different subscriber identities can be referred to as a “Dual SIM, Dual Active” (DSDA) wireless device.
[0036] FIG. 3B illustrates diagrams 360, 370, 380, 390 of additional exemplary multi-SIM / eSIM wireless devices 320, 322, 326, 328 that support multiple subscriber identities using removable UICCs 118 and / or eUICCs 108 with SIMs or eSIMs 208 implemented respectively thereon. As illustrated in diagram 360, a multi-SIM / eSIM wireless device 320 includes multiple UICCs 118, which can be inserted and removed individually or together, and communicate with one or more processors 104 that connect to wireless circuitry 308 that provides for wireless communication with one or more wireless networks 310. As the physical size and design of the multi-SIM / eSIM wireless device 320 can limit the number of UICCs 118 that can be supported, alternatively as shown by diagram 370, a multi-SIM / eSIM wireless device 322 can include an eUICC 108 connected with the processor (s) 104 and to the wireless network (s) 310 via the wireless circuitry 308. The eUICC 108 can be built into the multi-SIM / eSIM wireless device 322 and can be not removable from the multi-SIM / eSIM wireless device 322, e.g., permanently affixed to a circuit board in the multi-SIM / eSIM wireless device 322. The eUICC 108 can be programmed such that one or more eSIMs 208 can be implemented on the eUICC 108. Each eSIM 208 can be associated with a distinct subscriber identity and / or provide distinct services or subscriptions for a user of the multi-SIM / eSIM wireless device 322. Diagram 380 illustrates a multi-eSIM / SIM wireless device 326 that includes a removable UICC 118, on which can be installed one or more SIMs, and an eUICC 108 on which one or more eSIMs 208 can be installed. The combination of SIMs on the UICC 118 and / or eSIMs 208 on the eUICC 108 can provide for connections to one or more wireless networks 310 using the wireless circuitry 308 under the control of the processor (s) 104 of the multi-SIM / eSIM wireless device 326. Diagram 390 illustrates another multi-eSIM / SIM wireless device 328 that includes multiple UICCs 118, on which one or more SIMs can be installed, and an eUICC 108, on which one or more eSIMs 208 can be installed. A combination of one or more SIMs on a UICC 118 and / or eSIMs on an eUICC 108 can provide for connections to one or more wireless networks 310 using the wireless circuitry 308 under the control of the processor (s) 104 of the multi-SIM / eSIM wireless device 328. In general, a wireless device 102 that supports multiple subscriber identities can include (i) at an eUICC 108 and / or (ii) one or more UICCs 118. Each UICC 118 can support one or more SIMs, and each eUICC 108 can support one or more eSIMs 208. A wireless device 102 that supports multiple subscriber identities, e.g., 302, 320, 322, 326, 328, can include a combination of SIMs and / or eSIMs 208 to support communication with one or more wireless networks 310.
[0037] FIG. 4A illustrates a diagram 400 of a DSDA wireless device 402 that includes two removable UICCs 118A / B, on which at least two SIMs are installed, e.g., one SIM on each of the UICCs 118A / B. (While the DSDA wireless device 402 illustrated in FIG. 4A includes two UICCs 118A / B, alternative architectures for the DSDA wireless device 402 can include combinations of UICCs 118 and / or an eUICC 108 as discussed herein. ) Each UICC 118A / B can communicate with one or more baseband components 110, e.g., via another processor 104 and / or directly. A first cellular wireless protocol software (SW) stack 404A on the one or more baseband component (s) 110 can communicate with a first wireless network 310A (not shown) via wireless circuitry 308A, while a second cellular wireless protocol SW stack 404B can communicate with a second wireless network 310B (not shown) via wireless circuitry 308B. With parallel wireless circuitry 308A / B, the DSDA wireless device 402 can interact with two wireless networks 310A / B independently without requiring an interface or interaction between the cellular wireless protocol SW stacks 304A / B. Each of the cellular wireless protocol SW stacks 404A / B can support communication using one or more wireless communication protocols. With sufficient parallel wireless circuitry 308A / B and parallel cellular wireless protocol SW stacks 404A / B, the DSDA wireless device 402 can be registered with two different wireless networks 310A / B and can form connections with the two different wireless networks 310A / B in parallel and independently. The DSDA wireless device 402 can receive notifications (e.g., paging messages and / or paging indications) from a second wireless network 310B while connected to a first wireless network 310A, as the parallel wireless circuitry 308A / B permits parallel, simultaneous communication to two different wireless networks 310A / B. While the DSDA wireless device 402 advantageously can communicate with multiple wireless networks 310A / B, a DSDS wireless device can require less wireless circuitry and be more cost effective and power efficient.
[0038] FIG. 4B illustrates a diagram 410 of two exemplary configurations of DSDS wireless devices 412 / 414. (While the DSDS wireless devices 412 / 414 illustrated in FIG. 4B include two UICCs 118A / B, alternative architectures for the DSDS wireless devices 412 / 414 can include combinations of UICCs 118 and / or an eUICC 108 as discussed herein. ) A DSDS wireless device 412 includes two removable UICCs 118A / B, on which at least two SIMs are installed, and each UICC 118A / B can communicate with one or more baseband components 110, on which two cellular wireless protocol software stacks 404A / B operate. Each cellular wireless protocol software stack 404A / B can communicate with a respective wireless network 310A / B (not shown) via a set of common transmit / receive (Tx / Rx) wireless circuitry 406. In some embodiments, the set of common Tx / Rx wireless circuitry 406 provides for transmission and / or reception by one cellular wireless protocol SW stack 404A or 404B at a time, and thus the DSDS wireless device 412 can be associated with two (or more) wireless networks 310A / B at the same time but not be able to communicate with both wireless networks 310A / B simultaneously. For example, the DSDS wireless device 412 can be configured to operate in a time division mode that shares the Tx / Rx wireless circuitry 406 among the cellular wireless protocol SW stacks 404A / B. In some embodiments, the cellular wireless protocol SW stacks 404A / B can both operate in a radio resource control (RRC) idle mode and listen for paging messages from each of two different wireless networks 310A / B (e.g., alternate listening for paging messages from each wireless network 310A / B by reconfiguring if required the Tx / Rx wireless circuitry 406 to receive signals from each wireless network 310A / B. ) The DSDS wireless device 412 can permit associations with two different wireless networks 310A / B using two different subscriber identities but can allow only one active connection at any time. In some cases, one cellular wireless protocol SW stack 404A can operate in a RRC connected mode with an active voice or data connection with cellular wireless network 310A, while the other cellular wireless protocol SW stack 404B can operate in an RRC idle mode with cellular wireless network 310B and listen for paging messages from 310B.
[0039] In a second configuration of a DSDS wireless device 414, a shared set of wireless circuitry 408 / 410A / B provides for one transmit path and two parallel receive paths that can be used simultaneously. Each cellular wireless protocol software stack 404A / B can be configured to transmit via a set of transmit (Tx) wireless circuitry 408, but only one cellular wireless protocol software stack 404A / B can communicate at any one time via the Tx wireless circuitry 408. Both cellular wireless protocol software stacks 404A / B can receive radio frequency wireless signals via respective receive (Rx) wireless circuitry 410A / B in parallel. The DSDS wireless device 414 can share transmit wireless circuitry 408 between two cellular wireless protocol SW stacks 404A / B, while permitting simultaneous reception via dedicated (and / or configurable) receive wireless circuitry 410A / B. The DSDS wireless device 414 can provide for a connection (e.g., bi-directional data and / or signaling communication) with only one wireless network at a time; however, paging messages (or other control signaling) can be received (e.g., in a downlink direction) from two wireless networks 310A / B at the same time. Similarly, the parallel Rx wireless circuitry 410A / B can provide for reception of broadcast channels, signaling channels, synchronization channels, or other signals from two parallel wireless networks, e.g., for measurements of cells, as part of reselection and / or handover processes, when searching for wireless networks with which to establish connections, to perform downlink (DL) synchronization processes, and / or for associating or registering with wireless networks, etc. The DSDS wireless device 414 can be connected to a first wireless network 310A, e.g., in a voice call, data connection, video call, or other bi-directional connection with the first wireless network 310A, and advantageously can receive paging messages from a second wireless network 310B at the same time. However, if the cellular wireless protocol SW stack 404A of the DSDS wireless device 414 is connected to the first wireless network 310A with an active data connection via multiple antennas, e.g., a MIMO connection, in order for the other cellular wireless protocol SW stack 404B of the DSDS wireless device 414 to monitor paging messages from the second wireless network 310B, some of the multiple antennas may be reallocated from the active MIMO connection with the first wireless network 310A to receive signals from the second wireless network 310B. In some circumstances, while monitoring for paging messages from the second wireless network 310B using some of the antennas, the DSDS wireless device 414 may be unable to transmit a sounding reference signal (SRS) in the uplink direction to the first wireless network 310A via multiple antennas. The lack of an uplink SRS can result in an errant estimation of the communication channel between the first wireless network 310A and the DSDS wireless device 414, which can impact downlink performance from the first wireless network 310A to the DSDS wireless device 414, particularly when using a time division duplex (TDD) mode in which reciprocity of the communication channel is assumed so that measurements of the uplink communication channel from the DSDS wireless device 414 to the first wireless network 310A can be used for estimation of the downlink communication channel from the first wireless network 310A to the DSDS wireless device 414.
[0040] FIG. 5A illustrates a first diagram 500, in which a MIMO cellular wireless transceiver 502 of a network base station 112 transmits signals via a downlink (forward) channel HF to a MIMO cellular wireless transceiver 518 of a wireless device 102, and a second diagram 520, in which the MIMO cellular wireless transceiver 502 of the network base station 112 receives signals via an uplink (reverse) channel HR from the MIMO cellular wireless transceiver 518 of the wireless device 102. In some systems, e.g., when using a TDD communication scheme with identical frequency bands in the uplink and downlink directions, the base station MIMO cellular wireless transceiver 502 can estimate a transfer function matrix HF for the downlink channel based on measurements of uplink SRS transmitted by an MIMO SRS transmitter 516 of the wireless device MIMO cellular wireless transceiver 518 through the uplink channel. Based on an assumed reciprocity, the base station MIMO cellular wireless transceiver 502 can estimate the transfer function matrix HF to be related to the transfer function matrix HR determined from measurements of the uplink SRS received via the TX / RX connection matrix 510 and processed in a channel estimation module 508. In some embodiments, HF = (HR) T. The base station MIMO cellular wireless transceiver 502 can use the channel estimate when determining a schedule for downlink transmissions by a scheduler module 506 and for determining coefficients of a precoding matrix to be applied to downlink data via a precoder module 504. While the communication channel between the network base station 112 and the wireless device 102 can be time varying, the network base station 112 can use estimate the downlink channel based on the uplink channel when downlink transmissions occur relatively close in time to when the uplink SRS is received. A time required to measure the uplink channel can depend on the bandwidth used for the uplink SRS (how much of the frequency bandwidth is measured for each SRS) as well as on the number of separate MIMO paths need to be measured. The TX / RX connection matrix 510 can allow for switching between transmission and reception. In some embodiments, separate antennas (not shown) can be used for transmission and reception by the base station MIMO cellular wireless transceiver 502. Downlink data that is transmitted via the downlink channel to the wireless device 102 can be received via the TX / RX connection matrix 512 and processed in a MIMO receiver 514.
[0041] FIG. 5B illustrates a first block diagram 530 of a narrow bandwidth uplink SRS 532 that measures a portion of a total system bandwidth used for the uplink (and downlink) communication channel between a network base station 112 and a wireless device 102 and a second block diagram 540 of a wide bandwidth uplink SRS 542 that measures the total system bandwidth for the uplink channel. The amount of transmit power available and allowed for the wireless device 102 to use for the uplink SRS is limited, e.g., by hardware and by SAR requirements, and can be much less than available for the network base station 112 to use for downlink transmissions. As such, the wireless device 102 can transmit using a higher power density for the SRS over a narrower range of frequencies and sweep the narrow bandwidth UL SRS 532 across the total system bandwidth over time. In some cases, the wireless device 102 can transmit via different antenna ports at different times as well to measure different paths between antenna ports of the wireless device 102 and antenna ports of the network base station 112. The narrow bandwidth UL SRS 532 can provide a higher SRS transmit power density and therefore a higher quality received signal, e.g., higher signal-to-noise-plus-interference (SINR) , at the network base station 112, but can require more time to perform a complete measurement of the radio frequency band. Alternatively the wireless device 102 can transmit the SRS at a lower SRS transmit power density using a wide bandwidth UL SRS 542 that covers the entire range of frequencies in the frequency band used by the communication channel between the wireless device 102 and the network base station 112. There is a tradeoff between time to acquire a channel estimate and the quality of signals received with which to estimate the communication channel.
[0042] FIG. 6A illustrates a diagram 600 of communication states for a wireless device 102 and a network base station 112 where an interruption in uplink SRS transmission impacts downlink MIMO communication. The horizontal axis represents time advancing, while various states for both the wireless device 102 and the network base station 112 are time aligned. The wireless device 102 can include a first SIM / eSIM that is designated as a default data subscription (DDS) SIM / eSIM to be used by default for data communication between the wireless device 102 an associated cellular wireless network, labeled as NW1. The wireless device 102 can further include a second SIM / eSIM that is designated as a non-default data subscription (non-DDS) SIM / eSIM. In some embodiments, the non-DDS SIM / eSIM may be used for data communication, but not by default. In some embodiments, the non-DDS SIM / eSIM may be designated as a default voice subscription SIM / eSIM. The wireless device 102 can be registered with the first cellular wireless network, NW1, associated with the DDS SIM / eSIM and also can be registered with a second cellular wireless network, NW2, associated with the non-DDS SIM / eSIM. The wireless device 102 can have an active data connection via the DDS SIM / eSIM with the first cellular wireless network NW1 and be in an idle state via the non-DDS SIM / eSIM with the second cellular wireless network NW2. At 602, the wireless device 102 periodically transmits an uplink (UL) SRS via multiple (e.g., four) antenna ports to the first cellular wireless network NW1, while at 608, none of the antenna ports of the wireless device 102 are allocated for transmission (TX) or reception (RX) via the non-DDS SIM / eSIM. At 628, the network base station can estimate the DL communication channel to the wireless device 102 based at least in part on channel estimation using the UL SRS received from the wireless device 102 via multiple (e.g., four) antenna ports. At 614, the network base station can transmit downlink (DL) MIMO data to the wireless device 102 via multiple (e.g., four) antenna ports for the DDS SIM / eSIM connection using channel estimates derived from the UL SRS to determine precoding and other adaptive communication parameters for the MIMO DL communication link to the wireless device 102. At 620, the wireless device 102 receives the MIMO DL data for the DDS SIM / eSIM connection via multiple (e.g., four) antenna ports. Communication between the network base station and the wireless device 102 can be in accordance with a time division duplex (TDD) communication protocol such that DL MIMO data communication to the wireless device 102 and UL SRS communication for the DDS SIM / eSIM connection do not overlap in time.
[0043] Periodically, in accordance with a paging cycle of the second cellular wireless network associated with the non-DDS SIM / eSIM connection, the wireless device 102 can suspend transmission of the UL SRS associated with the DDS SIM / eSIM connection, as indicated at 604, in order to allocate at least some (e.g., two) of the multiple (e.g., four) antenna ports of the wireless device 102 to listen for paging messages from the second cellular wireless network, as indicated at 610. When the two antenna ports are allocated for paging reception for the non-DDS SIM / eSIM association with the second cellular wireless network, the wireless device 102 does not provide an indication to the network base station of the first cellular wireless network associated with the DDS SIM / eSIM connection that the UL SRS is suspended, and the base station of the first cellular wireless network continues to estimate the communication channel based on signals received during time periods when the UL SRS is expected from the wireless device 102. As such, at 630, the network base station can errantly estimate the communication channel based on random noise received in place of the UL SRS from the wireless device 102. In addition, the wireless device 102 can be unable to receive DL MIMO data that is transmitted by the network base station of the first cellular wireless network via the DDS SIM / eSIM connection, e.g., rank four DL MIMO data will not be able to be received and decoded by the two antenna ports available for the DDS SIM / eSIM connection, as the other two antenna ports are reallocated to the non-DDS SIM / eSIM. As indicated at 622, the DL MIMO data from the network base station of the first cellular wireless network therefore may be dropped by the wireless device 102, which can require retransmission and consume network resources that could otherwise be used for transmission successfully to another wireless device 102 or via a different configuration as discussed further herein.
[0044] The network base station of the first cellular wireless network can detect that the UL SRS is likely missing, e.g., based on low signal quality for the errant received UL SRS and can suspend DL MIMO data transmission to the wireless device 102, as indicated at 616. At 632, the network base station can initiate a channel estimation recovery procedure that correctly detects the UL SRS from the wireless device 102 and subsequently restart, at 618, DL MIMO data transmission to the wireless device 102 after completion of the channel estimation recovery procedure. In addition to the DL MIMO data that is dropped at 622, the wireless device 102, at 624, will not receive DL MIMO data from the network base station 112 of the first cellular wireless network will DL MIMO data transmission is suspended at 616. The wireless device 102, at 612, can reallocate the antenna ports previously used for paging reception at 610 to be used for periodic UL SRS transmission via the multiple (e.g., four) antenna ports at 606. After successful recovery of the UL SRS and channel estimation, the network base station 112 of the first cellular wireless network can reinitiate DL MIMO data transmission to the wireless device 102 at 618. While the multiple (e.g., four) antenna ports are allocated to the DDS SIM / eSIM connection, the network base station, at 634, continues to estimate the communication channel using the UL SRS, and the wireless device 102 can receive DL MIMO data via the DDS SIM / eSIM connection at 626.
[0045] Depending on the radio frequency bands used for communication via the DDS SIM / eSIM and via the non-DDS SIM / eSIM, the time period when the DDS UL SRS is suspended can vary. In some cases the DDS SIM / eSIM and the non-DDS SIM / eSIM can use the same radio frequency band, e.g., the N41 TDD radio frequency band, while in other cases, the DDS SIM / eSIM and the non-DDS SIM / eSIM can use different radio frequency bands, e.g., the N41 and N78 TDD radio frequency bands. Field observations and laboratory testing indicate that multiple distinct instances of the UL SRS can be missing during the UL SRS suspension period at 604. The resulting interruption in DL MIMO data for the DDS SIM / eSIM, at 622, when the DL MIMO data cannot be properly received, and at 624, when no DL MIMO data is sent, can result in a substantial drop in DL data throughput from the network base station of the first cellular wireless network to the wireless device 102 compared to a single SIM / eSIM scenario where only the DDS SIM / eSIM is being used (and there is no interruption of the UL SRS for a non-DDS SIM / eSIM) .
[0046] FIG. 6B illustrates a diagram 650 of communication states for a wireless device 102 and a network base station 112 where the network base station 112 identifies an interruption in UL SRS transmission that can impact DL MIMO communication and adjusts communication parameters to accommodate the interruption in the UL SRS. As in FIG. 6A, the wireless device 102 can be registered with a first cellular wireless network, NW1, associated with a DDS SIM / eSIM and also can be registered with a second cellular wireless network, NW2, associated with a non-DDS SIM / eSIM. The wireless device 102 can have an active data connection via the DDS SIM / eSIM with the first cellular wireless network NW1 and be in an idle state via the non-DDS SIM / eSIM with the second cellular wireless network NW2. The network base station 112 can identify a repetitive pattern of suspension of the UL SRS from the wireless device 102, e.g., based on observation a sequence of received UL SRS, and can determine that the wireless device 102 is unable to receive higher rank DL MIMO data transmissions that require reception via all (or a higher number) (e.g., four) antennas during time periods when the UL SRS is suspended. The network base station 112 can determine instead that the wireless device 102 is able (or more likely able) to receive lower rank DL MIMO data transmission that requires less than all (or a lower number of) (e.g., two) antennas for proper reception during the time periods when the UL SRS is suspended. In some embodiments, the network base station 112 schedules lower rank DL MIMO data transmission to the wireless device 102 during predicted time periods when the UL SRS is expected to be suspended by the wireless device 102, i.e., during UL SRS gap time periods. In some embodiments, the network base station 112 refrains from allocating DL MIMO data transmission (of any rank) to the wireless device 102 during the UL SRS gap time periods. When the UL SRS for the DDS SIM / eSIM from the wireless device 102 is suspended, at 604, and at least some, e.g., two of four, antenna ports of the wireless device 102 are allocated for paging reception for the non-DDS SIM / eSIM at 610, the network base station, at 652, can transmit to the wireless device 102 lower rank DL MIMO data, e.g., via two antenna ports, for the DDS SIM / eSIM connection rather than higher rank DL MIMO data, e.g., via four antenna ports, as transmitted at 614. The network base station 112 can also suspend channel estimation, at 660, while the UL SRS is suspended, and the wireless device 102 can receive the lower rank DL MIMO data, e.g., via two antenna ports, for the DDS SIM / eSIM connection at 656. In this scenario, the network base station 112 alternates between transmission of higher rank (e.g., rank four) DL MIMO data during time periods when the UL SRS is not suspended, e.g., at 614 and 654, and transmission of lower rank (e.g., rank two) DL MIMO data during time periods when the UL SRS is suspended, e.g., at 652. Additionally, the network base station 112 can perform channel estimation using the UL SRS received via multiple (e.g., four) antenna ports, at 628 and 662, when the UL SRS is present, and can suspend channel estimation, e.g., at 660, when the UL SRS is not present. Similarly, the wireless device 102 can receive higher rank (e.g., rank four) DL MIMO data when a higher number of antenna ports are available for reception for the DDS SIM / eSIM connection, e.g., at 620 and 658, and can receive lower rank (e.g., rank two) DL MIMO data when a lower number of antenna ports are available for the DDS SIM / eSIM connection, e.g., at 656, while some of the antenna ports are allocated for paging reception, at 610, for the non-DDS SIM / eSIM.
[0047] FIG. 6C illustrates a diagram 670 of communication states for a wireless device 102 and a network base station 112 where the network base station 112 identifies variability in the UL SRS transmission that can impact DL MIMO communication and adjusts communication parameters to improve performance of channel estimation based on the UL SRS. As in FIGS. 6A and 6B, the wireless device 102 can be registered with a first cellular wireless network, NW1, associated with a DDS SIM / eSIM and also can be registered with a second cellular wireless network, NW2, associated with a non-DDS SIM / eSIM. The wireless device 102 can have an active data connection via the DDS SIM / eSIM with the first cellular wireless network NW1 and be in an idle state via the non-DDS SIM / eSIM with the second cellular wireless network NW2. The network base station 112 can identify the signal quality for the UL SRS does not satisfy a quality criterion at times and can reconfigure communication parameters of the wireless device 102 to use an UL SRS that has shorter periodicity, e.g., less time between successive SRS instances, and / or to use an UL SRS with a wider bandwidth signal that allows for more rapid channel estimation across the entire radio frequency band of interest. The network base station 112 can transmit higher rank (e.g., via four antenna ports) DL MIMO data to the wireless device 102 for the DDS SIM / eSIM connection at 672 with data suspension and / or data retransmission as required responsive to a negative acknowledgement (NACK) or when no acknowledgement (positive or negative) is received. The network base station 112 can have previously recognized variability in the quality of the UL SRS and reconfigured to the wireless device 102 to transmit the UL SRS more frequently and / or with a wider bandwidth to allow for more rapid (and more frequent updates to) channel estimation. The network base station 112 can measure signal quality for UL SRS signals received via multiple antenna ports from the wireless device 102. At 674, the network base station can detect a lower quality UL SRS, e.g., received via one or more antenna ports, and can re-use a previously received valid UL SRS in place of the lower quality (presumed invalid) UL SRS. In some embodiments, the network base station measures UL SRS via each antenna port separately and determines whether to use the UL SRS most recently received via the corresponding antenna port or to discard the UL SRS most recently received and re-use a preceding most recently received (and valid) UL SRS instead. In the scenario depicted in FIG. 6C, the network base station sends higher rank DL MIMO data or suspends transmission of higher rank DL MIMO data to the wireless device 102 based on detection of changes in signal quality, e.g., measured signal-to-interference-plus-noise (SINR) values for the UL SRS. The wireless device 102 can discard DL MIMO data received (or ignore DL signals received) at 622 during time periods that the UL SRS for the DDS SIM / eSIM is suspended (because of antenna reconfiguration to listen for paging messages for the non-DDS SIM / eSIM) . The network base station 112, at 676, can detect when a valid UL SRS has been received and resume channel estimation with the most recently received valid UL SRS that satisfies the signal quality criterion.
[0048] FIG. 6D illustrates a diagram 680 of communication states for a wireless device 102 and a network base station 112 that combines the ideas of both FIG. 6B and 6C together, where the network base station identifies a repeated pattern of interrupted (and resulting poor quality) in UL SRS transmission by the wireless device 102 and adjusts communication parameters for both DL MIMO transmission by the network base station and communication parameters of the wireless device 102 for UL SRS to improve downlink data throughput performance and adapt channel estimation based on observed and measured variability in the UL SRS. As in FIGS. 6A, 6B, and 6C, the wireless device 102 can be registered with a first cellular wireless network, NW1, associated with a DDS SIM / eSIM and also can be registered with a second cellular wireless network, NW2, associated with a non-DDS SIM / eSIM. The wireless device 102 can have an active data connection via the DDS SIM / eSIM with the first cellular wireless network NW1 and be in an idle state via the non-DDS SIM / eSIM with the second cellular wireless network NW2. The wireless device 102 can split use of multiple antenna ports to allow for simultaneous reception of lower rank DL MIMO data from the network base station 112 for the DDS SIM / eSIM and to listen for paging indications for the non-DDS SIM / eSIM during time periods, at 604, when the UL SRS is suspended. As in FIG. 6B, the network base station 112 can identify a repetitive pattern of suspension of the UL SRS from the wireless device 102, e.g., based on observation a sequence of received UL SRS, and can determine that the wireless device 102 is unable to receive higher rank DL MIMO data transmissions that require reception via all (or a higher number) (e.g., four) antennas during time periods when the UL SRS is suspended. The network base station 112 can determine instead that the wireless device 102 is able (or more likely able) to receive lower rank DL MIMO data transmission that requires less than all (or a lower number of) (e.g., two) antennas for proper reception during the time periods when the UL SRS is suspended. In some embodiments, the network base station 112 schedules lower rank DL MIMO data transmission to the wireless device 102 during predicted time periods when the UL SRS is expected to be suspended by the wireless device 102, i.e., during UL SRS gap time periods. In some embodiments, the network base station 112 refrains from allocating DL MIMO data transmission (of any rank) to the wireless device 102 during the UL SRS gap time periods. When the UL SRS for the DDS SIM / eSIM from the wireless device 102 is suspended, at 604, and at least some, e.g., two of four, antenna ports of the wireless device 102 are allocated for paging reception for the non-DDS SIM / eSIM at 610, the network base station, at 652, can transmit to the wireless device 102 lower rank DL MIMO data, e.g., via two antenna ports, for the DDS SIM / eSIM connection rather than higher rank DL MIMO data, e.g., via four antenna ports, as transmitted at 614. Furthermore, as in FIG. 6C, the network base station 112 can identify the signal quality for the UL SRS does not satisfy a quality criterion at times and can reconfigure communication parameters of the wireless device 102 to use an UL SRS that has shorter periodicity, e.g., less time between successive SRS instances, and / or to use an UL SRS with a wider bandwidth signal that allows for more rapid channel estimation across the entire radio frequency band of interest. The network base station 112 can have previously recognized variability in the quality of the UL SRS and reconfigured to the wireless device 102 to transmit the UL SRS more frequently and / or with a wider bandwidth to allow for more rapid (and more frequent updates to) channel estimation. The network base station 112 can measure signal quality for UL SRS signals received via multiple antenna ports from the wireless device 102. At 674, the network base station can detect a lower quality UL SRS, e.g., received via one or more antenna ports, and can re-use a previously received valid UL SRS in place of the lower quality (presumed invalid) UL SRS. In some embodiments, the network base station measures UL SRS via each antenna port separately and determines whether to use the UL SRS most recently received via the corresponding antenna port or to discard the UL SRS most recently received and re-use a preceding most recently received (and valid) UL SRS instead. The network base station 112, at 676, can detect when a valid UL SRS has been received and resume channel estimation with the most recently received valid UL SRS that satisfies the signal quality criterion. In the scenario illustrated in FIG. 6D, the network base station 112 alternates between transmission of higher rank (e.g., rank four) DL MIMO data during time periods when the UL SRS is not suspended, e.g., at 614 and 654, and transmission of lower rank (e.g., rank two) DL MIMO data during time periods when the UL SRS is suspended, e.g., at 652. Similarly, the wireless device 102 can receive higher rank (e.g., rank four) DL MIMO data when a higher number of antenna ports are available for reception for the DDS SIM / eSIM connection, e.g., at 620 and 658, and can receive lower rank (e.g., rank two) DL MIMO data when a lower number of antenna ports are available for the DDS SIM / eSIM connection, e.g., at 656, while some of the antenna ports are allocated for paging reception, at 610, for the non-DDS SIM / eSIM.
[0049] FIG. 7A illustrates a flow diagram 700 of an exemplary technique to adapt communication parameters used by a wireless device 102 and for a communication channel between the wireless device 102 and a network base station 112 to accommodate suspension of an uplink SRS transmission by the wireless device 102. The wireless device 102 can be registered with a first cellular wireless network associated with a first SIM / eSIM, e.g., a DDS SIM / eSIM designated as a default SIM / eSIM for data communication, and also can be registered with a second cellular wireless network associated with a second SIM / eSIM, e.g., a non-DDS SIM / eSIM. The wireless device 102 can have an active data connection via the DDS SIM / eSIM with a network base station 112 of the first cellular wireless network and be in an idle state via the non-DDS SIM / eSIM with a corresponding network base station 112 the second cellular wireless network. The wireless device 102 can periodically send an UL SRS to the network base station 112 of the first cellular wireless network for measurement of the communication channel between the wireless device 102 and the network base station 112 for the DDS SIM / eSIM connection. The wireless device 102 can suspend transmission of the UL SRS during separate time periods to monitor paging activity for the non-DDS SIM / eSIM connection with the second cellular wireless network. Paging cycles of a cellular wireless network can occur at one of several enumerated number of frames in accordance with wireless cellular communication standards, e.g., once every 32, 64, 128, or 256 radio frames. The network base station 112, at 702, can have knowledge of different possible paging cycles and can monitor received UL SRS signals to recognize a pattern of periodicity during which UL SRS signal quality can be substantially lower, which can indicate the network base station 112 is measuring noise in place of a genuine UL SRS signal from the wireless device 102. When a particular pattern of changes in UL SRS signal quality, which can indicate gaps in transmission of the UL SRS, is identified by the network base station 112, transmission of DL MIMO data can be changed for such identified gaps, e.g., to suspend DL MIMO data scheduling to the wireless device 102 or to schedule lower rank DL MIMO data that can be expected to be received properly with fewer antenna ports by the wireless device 102 rather than higher rank DL MIMO data that can require use of all (or a higher number of) antenna ports of the wireless device 102, as some of the antenna ports at the wireless device 102 will be diverted for paging reception for the non-DDS SIM / eSIM connection and not available for reception of the DL MIMO data for the DDS SIM / eSIM connection. Network resources that would otherwise be wasted, if allocated to the wireless device 102 during the UL SRS gap time periods, can be scheduled for other wireless devices 102 improving network capacity utilization. Scheduling of higher rank DL MIMO data can resume outside of the UL SRS gap time periods, which can reduce time to recover afterwards and reduce data throughput loss that could occur when not recognizing the periodic UL SRS gap time periods.
[0050] As illustrated in the flow diagram 700, at 702, the network base station 112 can collect a sequence of UL SRS signals received over multiple frames, e.g., for N =M*32 frames, where the network base station 112 recognizes that paging cycles can occur periodically at an integer multiple of 32 frames. The network base station 112 can determine whether a pattern of UL SRS suspension by the wireless device 102 can be identified from the received sequence of UL SRS signals. When a regular pattern of UL SRS gap time periods is identified, the network base station 112, at 706, can schedule lower rank DL MIMO data (or schedule no DL MIMO data) for the wireless device 102 during UL SRS gap time periods (which can be predicted based the previous identified pattern of UL SRS suspension) . After detecting return of the UL SRS following UL SRS gap time periods, the network base station 112, at 708, can resume higher rank DL MIMO data scheduling for the wireless device 102. When a regular pattern of UL SRS gap time periods is not identified, e.g., for a wireless device 102 that does not have a second idle connection for the non-DDS SIM / eSIM, the network base station 112, at 710, can continue to scheduler higher rank MIMO data for the wireless device 102.
[0051] FIG. 7B illustrates a flow diagram 750 of another exemplary technique to adapt communication parameters used by a wireless device 102 and for a communication channel between the wireless device 102 and a network base station 112 to accommodate suspension of an uplink SRS transmission by the wireless device 102. The network base station 112 can maintain a signal quality metric, e.g., an SINR value, for reception of the UL SRS, e.g., for reception via each individual antenna port, and when a large drop in the signal quality metric occurs, e.g., a negative change in SINR value having a magnitude that exceeds a signal quality metric threshold, the network base station 112 can determine to ignore (e.g., discard) the received UL SRS with the poor signal quality metric and substitute a previously received (most recent) valid UL SRS for the antenna port in place of the errant UL SRS. In some embodiments, the network base station 112 can adjust communication parameters that configure the UL SRS for the wireless device 102 to improve the validity of the most recent valid SRS, e.g., by reconfiguring the UL SRS to have a shorter periodicity (more frequent transmissions) to increase the time domain relevance, and / or by reconfiguring the UL SRS to use a wider radio frequency bandwidth to allow for measuring the communication channel across all radio frequencies used more rapidly. By substituting a most recently received valid UL SRS in place of an errant UL SRS, the network base station 112 can mitigate the impact of the UL SRS gaps on channel estimation, which impacts downlink precoding for DL MIMO data transmission to the wireless device 102.
[0052] As illustrated in the flow diagram 750 of FIG. 7B, the network base station 112, at 752, can calculate an average signal quality, e.g., SINR value, for each UL SRS antenna port (based on received signal during time periods when UL SRS is expected from the wireless device 102) , where averaging can use a sliding window or other time-averaging technique. The network base station 112, at 754, can determine whether a change in the average signal quality for an UL SRS antenna port satisfies a threshold criterion, e.g., decreases in magnitude by more than a signal quality change threshold, e.g., average (or instantaneous measured) SINR decreases more than an SINR delta threshold value. When there is no determination of a decrease in UL SRS signal quality of a magnitude exceeding the SINR delta threshold for the antenna port, the network base station 112 can use the UL SRS for channel estimation and can update the SINR metric for the UL SRS antenna port, at 760, based on the received UL SRS. When there is a determination of a decrease in UL SRS signal quality above the SINR delta threshold for the antenna port, the network base station 112, at 756, can discard the receive UL SRS instance received and reuse a previous valid (e.g., most recently received valid UL SRS that satisfied the SINR signal quality) in place of the errant received UL SRS instance. In some cases, the network base station 112 considers each SRS antenna port individually. In some cases, the network base station 112 maintains an SINR value for each SRS antenna port individually. In some cases, the network base station 112 retains and uses (or discards) received UL SRS individually for each UL SRS antenna port. In some cases, the network base station 112 discards received UL SRS instances for all UL SRS antenna ports when an average SINR value for at least one antenna port decreases by more than the SINR delta threshold value. In some cases, the network base station 112 only discards the received UL SRS instance for the individual UL SRS antenna port. In some cases, the network base station maintains an SINR value for a combination of the UL SRS antenna ports and determines whether to retain and use received UL SRS signals from one or more of the UL SRS antenna ports based on the combined SINR value. When there is a determination of a decrease in UL SRS signal quality above the SINR delta threshold for an antenna port or for a group of antenna ports, the network base station 112, at 758, can reconfigure the wireless device 102 to transmit the UL SRS more frequently (shorter periodicity) and / or to use a wider bandwidth UL SRS signal (rather than a narrower bandwidth UL SRS signal that can require sweeping through the entire radio frequency band of the communication channel) . Subsequently to updating the SINR metric at y60 or to reconfiguring the wireless device 102 (if not already done previously) at 758, the network base station 112, at 762, can continue to schedule DL MIMO data for transmission to the wireless device 102.
[0053] FIG. 8 illustrates a flow chart 800 of an exemplary method performed by a network base station 112 to adapt communication parameters to accommodate suspension of an uplink SRS transmission by a wireless device 102. At 802, the network base station 112, receives, from the wireless device 102, an uplink transmission that includes repetitions of an SRS. At 804, the network base station 112 accumulates consecutive instances of the SRS to form an SRS sequence. At 806, the network base station 112 determines whether the SRS sequence includes a repeated pattern of errant SRS at periodic time intervals, the errant SRS indicating gaps in uplink SRS transmission from the wireless device 102 to the network base station 112. At 808, when the SRS sequence includes the repeated pattern of errant SRS, the network base station 112: i) determines characteristics of the repeated pattern of errant SRS to predict a time duration and a periodical interval spacing of the gaps in uplink SRS transmission, and ii) disallows scheduling of higher rank downlink data to the wireless device 102 during predicted gaps in uplink SRS transmission.
[0054] In some embodiments, the method further includes the network base station 112 allowing scheduling of higher rank downlink data to the wireless device 102 when the SRS sequence does not include the repeated pattern of errant SRS. In some embodiments, the method further includes the network base station 112 allowing scheduling of higher rank downlink data to the wireless device outside the predicted gaps in uplink SRS transmission when the SRS sequence includes the repeated pattern of errant SRS. In some embodiments, the method further includes the network base station 112 allowing scheduling of higher rank downlink data to the wireless device when an SRS quality metric satisfies a quality threshold after a most recent predicted gap in uplink SRS transmission when the SRS sequence includes the repeated pattern of errant SRS. In some embodiments, the higher rank downlink data includes MIMO data transmitted with a maximum rank supported by the wireless device 102. In some embodiments, the method further includes the network base station 112 allowing scheduling of lower rank downlink data to the wireless device during the predicted gaps in uplink SRS transmission when the SRS sequence includes the repeated pattern of errant SRS. In some embodiments, the lower rank downlink data includes MIMO data transmitted with a rank less than a maximum rank supported by the wireless device 102. In some embodiments, the network base station 112 receives the uplink transmission that includes repetitions of the SRS via multiple antenna ports, and the method further includes the network base station 112: i) calculating an average signal-to-interference-plus-noise ratio (SINR) SRS value for each antenna port based on SRS instances received via the antenna port, and ii) for each antenna port, when the average SINR SRS value for the antenna port does not satisfy an SRS quality criterion, excluding one or more SRS instances most recently received via the antenna port from channel estimation, and reusing one or more previous SRS instances received via the antenna port for the channel estimation. In some embodiments, when the average SINR SRS value for at least one antenna port of the multiple antenna ports does not satisfy the SRS quality criterion, the network base station 112 reconfigures the wireless device 102 to transmit the SRS more frequently and with a wider bandwidth signal when possible. In some embodiments, for each antenna port of the multiple antenna ports, when the average SINR SRS value for the antenna port satisfies the SRS quality criterion, the network base station 112 uses the one or more SRS instances most recently received via the antenna port for channel estimation and for updating the average SINR SRS value.
[0055] FIG. 9 illustrates a flow chart 900 of an exemplary method performed by a network base station 112 to adapt communication parameters to accommodate suspension of an uplink SRS transmission by a wireless device 102. At 902, the network base station 112 receives, from a wireless device 102 via multiple antenna ports, an uplink transmission that includes multiple SRS instances. At 904, the network base station 112 calculates an average SINR SRS value for each antenna port based on SRS instances received via the antenna port. At 906, the network base station 112, for each antenna port of the multiple antenna ports, when the average SINR SRS value for the antenna port does not satisfy an SRS quality criterion: i) excludes one or more SRS instances most recently received via the antenna port from channel estimation, and ii) reuses one or more previous SRS instances received via the antenna port for the channel estimation.
[0056] In some embodiments, the method further includes the network base station 112, when the average SINR SRS value for at least one antenna port of the multiple antenna ports does not satisfy the SRS quality criterion, reconfiguring the wireless device 102 to transmit the SRS more frequently and with a wider bandwidth signal when possible. In some embodiments, the method further includes the network base station 112, for each antenna port of the multiple antenna ports, when the average SINR SRS value for the antenna port satisfies the SRS quality criterion, using the one or more SRS instances most recently received via the antenna port for updating the average SINR SRS value.
[0057] Representative Exemplary Apparatus
[0058] FIG. 10 illustrates in block diagram format an exemplary computing device 1000 that can be used to implement the various components and techniques described herein, according to some embodiments. In particular, the detailed view of the exemplary computing device 1000 illustrates various components that can be included in the wireless device 102. As shown in FIG. 10, the computing device 1000 can include one or more processors 1002 that represent microprocessors or controllers for controlling the overall operation of computing device 1000. In some embodiments, the computing device 1000 can also include a user input device 1008 that allows a user of the computing device 1000 to interact with the computing device 1000. For example, in some embodiments, the user input device 1008 can take a variety of forms, such as a button, keypad, dial, touch screen, audio input interface, visual / image capture input interface, input in the form of sensor data, etc. In some embodiments, the computing device 1000 can include a display 1010 (screen display) that can be controlled by the processor (s) 1002 to display information to the user (for example, information relating to incoming, outgoing, or active communication sessions) . A data bus 1016 can facilitate data transfer between at least a storage device 1040, the processor (s) 1002, and a controller 1013. The controller 1013 can be used to interface with and control different equipment through an equipment control bus 1014. The computing device 1000 can also include a network / bus interface 1011 that couples to a data link 1012. In the case of a wireless connection, the network / bus interface 1011 can include wireless circuitry, such as a wireless transceiver and / or baseband component. The computing device 1000 can also include a secure element 1024. The secure element 1024 can include an eUICC 108, an iUICC, and / or one or more UICCs 118.
[0059] The computing device 1000 also includes a storage device 1040, which can include a single storage or a plurality of storages (e.g., hard drives and / or solid-state drives) , and includes a storage management module that manages one or more partitions within the storage device 1040. In some embodiments, storage device 1040 can include flash memory, semiconductor (solid state) memory or the like. The computing device 1000 can also include a Random-Access Memory (RAM) 1020 and a Read-Only Memory (ROM) 1022. The ROM 1022 can store programs, utilities or processes to be executed in a non-volatile manner. The RAM 1020 can provide volatile data storage, and stores instructions related to the operation of the computing device 1000.
[0060] Wireless Terminology
[0061] In accordance with various embodiments described herein, the terms “wireless communication device, ” “wireless device, ” “mobile device, ” “mobile station, ” “mobile wireless device, ” and “user equipment” (UE) may be used interchangeably herein to describe one or more consumer electronic devices that may be capable of performing procedures associated with various embodiments of the disclosure. In accordance with various implementations, any one of these consumer electronic devices may relate to: a cellular phone or a smart phone, a tablet computer, a laptop computer, a notebook computer, a personal computer, a netbook computer, a media player device, an electronic book device, a device, a wearable computing device, as well as any other type of electronic computing device having wireless communication capability that can include communication via one or more wireless communication protocols such as used for communication on: a wireless wide area network (WWAN) , a wireless metro area network (WMAN) a wireless local area network (WLAN) , a wireless personal area network (WPAN) , a near-field communication (NFC) , a cellular wireless network, a fourth generation (4G) LTE, LTE Advanced (LTE-A) , 5G, and / or 6G or other present or future developed advanced cellular wireless networks.
[0062] The wireless device, in some embodiments, can also operate as part of a wireless communication system, which can include a set of client devices, which can also be referred to as stations, client wireless devices, or client wireless communication devices, interconnected to an access point (AP) , e.g., as part of a WLAN, and / or to each other, e.g., as part of a WPAN and / or an “ad hoc” wireless network. In some embodiments, the client device can be any wireless device that is capable of communicating via a WLAN technology, e.g., in accordance with a wireless local area network communication protocol. In some embodiments, the WLAN technology can include a Wi-Fi (or more generically a WLAN) wireless communication subsystem or radio, the Wi-Fi radio can implement an Institute of Electrical and Electronics Engineers (IEEE) 802.11 technology, such as one or more of: IEEE 802.11a; IEEE 802.11b; IEEE 802.11g; IEEE 802.11-2007; IEEE 802.11n; IEEE 802.11-2012; IEEE 802.11ac; or other present or future developed IEEE 802.11 technologies.
[0063] Additionally, it should be understood that the UEs described herein may be configured as multi-mode wireless devices that are also capable of communicating via different radio access technologies (RATs) . In these scenarios, a multi-mode user equipment (UE) can be configured to prefer attachment to a 5G wireless network offering faster data rate throughput, as compared to other 4G LTE legacy networks offering lower data rate throughputs. For instance, in some implementations, a multi-mode UE may be configured to fall back to a 4G LTE network or a 3G legacy network, e.g., an Evolved High Speed Packet Access (HSPA+) network or a Code Division Multiple Access (CDMA) 2000 Evolution-Data Only (EV-DO) network, when 5G wireless networks are otherwise unavailable.
[0064] It is well understood that the use of personally identifiable information should follow privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy of users. In particular, personally identifiable information data should be managed and handled so as to minimize risks of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to users.
[0065] The various aspects, embodiments, implementations or features of the described embodiments can be used separately or in any combination. Various aspects of the described embodiments can be implemented by software, hardware or a combination of hardware and software. The described embodiments can also be embodied as computer readable code on a non-transitory computer readable medium. The non-transitory computer readable medium is any data storage device that can store data which can thereafter be read by a computer system. Examples of the non-transitory computer readable medium include read-only memory, random-access memory, CD-ROMs, HDDs, DVDs, magnetic tape, and optical data storage devices. The non-transitory computer readable medium can also be distributed over network-coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.
[0066] The foregoing description, for purposes of explanation, used specific nomenclature to provide a thorough understanding of the described embodiments. However, it will be apparent to one skilled in the art that the specific details are not required in order to practice the described embodiments. Thus, the foregoing descriptions of specific embodiments are presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the described embodiments to the precise forms disclosed. It will be apparent to one of ordinary skill in the art that many modifications and variations are possible in view of the above teachings.
Claims
1.A method to adapt communication parameters for communication with a wireless device, the method comprising:by a network base station:receiving, from the wireless device, an uplink transmission that includes repetitions of a sounding reference signal (SRS) ;accumulating multiple consecutive instances of the SRS to form an SRS sequence;determining whether the SRS sequence includes a repeated pattern of errant SRS at periodic time intervals, the errant SRS indicating gaps in uplink SRS transmission from the wireless device to the network base station; andwhen the SRS sequence includes the repeated pattern of errant SRS:determining characteristics of the repeated pattern of errant SRS to predict a time duration and a periodic interval spacing of the gaps in uplink SRS transmission; anddisallowing scheduling of higher rank downlink data to the wireless device during predicted gaps in uplink SRS transmission.2.The method of claim 1, further comprising:by the network base station:when the SRS sequence does not include the repeated pattern of errant SRS:allowing scheduling of higher rank downlink data to the wireless device.3.The method of claim 1, further comprising:by the network base station:when the SRS sequence includes the repeated pattern of errant SRS:allowing scheduling of higher rank downlink data to the wireless device outside the predicted gaps in uplink SRS transmission.4.The method of claim 1, further comprising:by the network base station:when the SRS sequence includes the repeated pattern of errant SRS:allowing scheduling of higher rank downlink data to the wireless device when an SRS quality metric satisfies a quality threshold after a most recent predicted gap in uplink SRS transmission.5.The method of any one of claims 1 to 4, wherein the higher rank downlink data comprises multiple input multiple output (MIMO) data transmitted with a maximum rank supported by the wireless device.6.The method of claim 1, further comprising:by the network base station:when the SRS sequence includes the repeated pattern of errant SRS:allowing scheduling of lower rank downlink data to the wireless device during the predicted gaps in uplink SRS transmission.7.The method of claim 6, wherein the lower rank downlink data comprises MIMO data transmitted with a rank less than a maximum rank supported by the wireless device.8.The method of claim 1, wherein:the network base station receives the uplink transmission that includes repetitions of the SRS via multiple antenna ports; andthe method further comprises the network base station:calculating an average signal-to-interference-plus-noise ratio (SINR) SRS value for each antenna port based on SRS instances received via the antenna port; andfor each antenna port of the multiple antenna ports, when the average SINR SRS value for the antenna port does not satisfy an SRS quality criterion:excluding one or more SRS instances most recently received via the antenna port from channel estimation; andreusing one or more previous SRS instances received via the antenna port for the channel estimation.9.The method of claim 8, further comprising:when the average SINR SRS value for at least one antenna port of the multiple antenna ports does not satisfy the SRS quality criterion:reconfiguring the wireless device to transmit the SRS more frequently and with a wider bandwidth signal when possible.10.The method of claim 8, further comprising:for each antenna port of the multiple antenna ports, when the average SINR SRS value for the antenna port satisfies the SRS quality criterion:using the one or more SRS instances most recently received via the antenna port for channel estimation and for updating the average SINR SRS value.11.A method to adapt communication parameters for communication with a wireless device, the method comprising:by a network base station:receiving, from the wireless device via multiple antenna ports, an uplink transmission that includes multiple sounding reference signal (SRS) instances;calculating an average signal-to-interference-plus-noise ratio (SINR) SRS value for each antenna port based on SRS instances received via the antenna port; andfor each antenna port of the multiple antenna ports, when the average SINR SRS value for the antenna port does not satisfy an SRS quality criterion:excluding one or more SRS instances most recently received via the antenna port from channel estimation; andreusing one or more previous SRS instances received via the antenna port for the channel estimation.12.The method of claim 11, further comprising:when the average SINR SRS value for at least one antenna port of the multiple antenna ports does not satisfy the SRS quality criterion:reconfiguring the wireless device to transmit the SRS more frequently and with a wider bandwidth signal when possible.13.The method of claim 11, further comprising:for each antenna port of the multiple antenna ports, when the average SINR SRS value for the antenna port satisfies the SRS quality criterion:using the one or more SRS instances most recently received via the antenna port for updating the average SINR SRS value.14.A network base station comprising:one or more processors coupled to memory, the one or more processors configured to:receive, from a wireless device, an uplink transmission that includes repetitions of a sounding reference signal (SRS) ;accumulate multiple consecutive instances of the SRS to form an SRS sequence;determine whether the SRS sequence includes a repeated pattern of errant SRS at periodic time intervals, the errant SRS indicating gaps in uplink SRS transmission from the wireless device to the network base station; andwhen the SRS sequence includes the repeated pattern of errant SRS:determine characteristics of the repeated pattern of errant SRS to predict a time duration and a periodic interval spacing of the gaps in uplink SRS transmission; anddisallow scheduling of higher rank downlink data to the wireless device during predicted gaps in uplink SRS transmission.15.The network base station of claim 14, wherein the one or more processors are further configured to:when the SRS sequence does not include the repeated pattern of errant SRS:allow scheduling of higher rank downlink data to the wireless device.16.The network base station of claim 14, wherein the one or more processors are further configured to:when the SRS sequence includes the repeated pattern of errant SRS:allow scheduling of higher rank downlink data to the wireless device outside the predicted gaps in uplink SRS transmission.17.The network base station of claim 14, wherein the one or more processors are further configured to:when the SRS sequence includes the repeated pattern of errant SRS:allow scheduling of higher rank downlink data to the wireless device when an SRS quality metric satisfies a quality threshold after a most recent predicted gap in uplink SRS transmission.18.The network base station of any one of claims 14 to 17, wherein the higher rank downlink data comprises multiple input multiple output (MIMO) data transmitted with a maximum rank supported by the wireless device.19.The network base station of claim 14, wherein the one or more processors are further configured to:when the SRS sequence includes the repeated pattern of errant SRS:allow scheduling of lower rank downlink data to the wireless device during the predicted gaps in uplink SRS transmission.20.The network base station of claim 19, wherein the lower rank downlink data comprises MIMO data transmitted with a rank less than a maximum rank supported by the wireless device.21.The network base station of claim 14, wherein:the network base station receives the uplink transmission that includes repetitions of the SRS comprises via multiple antenna ports; andthe one or more processors are further configured to:calculate an average signal-to-interference-plus-noise ratio (SINR) SRS value for each antenna port based on SRS instances received via the antenna port; andfor each antenna port of the multiple antenna ports, when the average SINR SRS value for the antenna port does not satisfy an SRS quality criterion:exclude one or more SRS instances most recently received via the antenna port from channel estimation; andreuse one or more previous SRS instances received via the antenna port for the channel estimation.22.The network base station of claim 21, wherein the one or more processors are further configured to:when the average SINR SRS value for at least one antenna port of the multiple antenna ports does not satisfy the SRS quality criterion:reconfigure the wireless device to transmit the SRS more frequently and with a wider bandwidth signal when possible.23.The network base station of claim 21, wherein the one or more processors are further configured to:for each antenna port of the multiple antenna ports, when the average SINR SRS value for the antenna port satisfies the SRS quality criterion:use the one or more SRS instances most recently received via the antenna port for channel estimation and for updating the average SINR SRS value.24.A network base station comprising:one or more processors coupled to memory, the one or more processors configured to:receive, from a wireless device via multiple antenna ports, an uplink transmission that includes multiple sounding reference signal (SRS) instances;calculate an average signal-to-interference-plus-noise ratio (SINR) SRS value for each antenna port based on SRS instances received via the antenna port; andfor each antenna port of the multiple antenna ports, when the average SINR SRS value for the antenna port does not satisfy an SRS quality criterion:exclude one or more SRS instances most recently received via the antenna port from channel estimation; andreuse one or more previous SRS instances received via the antenna port for the channel estimation.25.The network base station of claim 24, wherein the one or more processors are further configured to:when the average SINR SRS value for at least one antenna port of the multiple antenna ports does not satisfy the SRS quality criterion:reconfigure the wireless device to transmit the SRS more frequently and with a wider bandwidth signal when possible.26.The network base station of claim 24, wherein the one or more processors are further configured to:for each antenna port of the multiple antenna ports, when the average SINR SRS value for the antenna port satisfies the SRS quality criterion:use the one or more SRS instances most recently received via the antenna port for updating the average SINR SRS value.
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