PATENT DOCUMENT

Publication Number: US-10917222-B2
Application Number: US-201414503280-A
Country: US
Kind Code: B2

Title: Simultaneous operation of multiple time division duplex links using a single transceiver

Abstract:
Apparatus and methods for performing simultaneous time division duplex (TDD) communications are disclosed. A wireless communication device can be configured to establish both a first TDD communication link and a second TDD communication link with a network, such as a telecommunication network. Thereafter, the wireless communication device can send TDD uplink data to the network via the first TDD communication link, and receive TDD downlink data from the network via the second TDD communication link, such that a portion of the TDD uplink data is sent to the network at the same time a portion of the TDD downlink data is received from the network. In this manner, the transmissions of TDD uplink data and the TDD downlink data can occur simultaneously, via multiple communication links. Further, the TDD downlink data can be received in multiple, coordinated data transmissions using Long Term Evolution (LTE) multiple-input and multiple-output (MIMO) antenna diversity.

Claims:
What is claimed is: 
     
       1. A method for performing simultaneous time division duplex (TDD) communications with a mobile device, the method comprising:
 by the mobile device:
 establishing a first TDD communication link with a wireless network; 
 establishing a second TDD communication link with the wireless network; and 
 alternating between a first configuration and a second configuration in consecutive sequential time periods corresponding to subframe transmission time intervals (TTIs) of time-division Long Term Evolution (TD-LTE) data frames while listening for a Global System for Mobile (GSM) paging communication addressed to the mobile device; 
 wherein:
 during first time periods, the first configuration comprises configuring wireless circuitry including a transceiver and switchable radio frequency front end coupled to multiple antennas to:
 send TDD uplink data to the wireless network via the first TDD communication link through a first antenna of the multiple antennas; and 
 receive first TDD downlink data from the wireless network via the second TDD communication link through a second antenna of the multiple antennas; and 
 
 during second time periods, the second configuration comprises reconfiguring the wireless circuitry to:
 receive second TDD downlink data from the wireless network via the first TDD communication link through the first and second antennas; and 
 refrain from transmitting uplink data to the wireless network via the second TDD communication link, 
 
 wherein a portion of the TDD uplink data is transmitted from the mobile device at the same time a portion of the first TDD downlink data is received at the mobile device during the first time periods, and 
 wherein the first TDD downlink data is the GSM paging communication, the TDD uplink data is a TD-LTE data transmission to the wireless network, the second TDD downlink data is a TD-LTE data transmission from the wireless network, and communication by the wireless network of the GSM paging communication to the mobile device is coordinated to align with TDD uplink subframe TTIs of the TD-LTE data frames. 
 
 
 
     
     
       2. The method of  claim 1 , wherein the second TDD downlink data is received at the mobile device in multiple coordinated data transmissions using Long Term Evolution (LTE) multiple-input and multiple-output (MIMO) antenna diversity. 
     
     
       3. The method of  claim 1 , further comprising:
 responsive to receipt of the GSM paging communication addressed to the mobile device: 
 establishing a GSM voice call at the mobile device via the second TDD communication link; and 
 discontinuing TD-LTE uplink and downlink communication via the first TDD communication link during the GSM voice call. 
 
     
     
       4. The method of  claim 1 , wherein the first TDD communication link is established using a first radio communication channel and the second TDD communication link is established using a second radio communication channel having different assigned radio frequency spectrum than the first radio communication channel. 
     
     
       5. A wireless communication device comprising:
 wireless circuitry including a radio transceiver configured to support simultaneous time division duplex (TDD) communications and a switchable radio frequency front end coupled to multiple antennas; 
 one or more processors; and 
 a storage device storing computer-executable instructions that, when executed by the one or more processors, causes the wireless communication device to: 
 establish a first TDD communication link and a second TDD communication link with a wireless network; and 
 alternate between a first configuration and a second configuration in consecutive sequential time periods corresponding to subframe transmission time intervals (TTIs) of time-division Long Term Evolution (TD-LTE) data frames while listening for a Global System for Mobile (GSM) paging communication addressed to the wireless communication device; 
 wherein: 
 during first time periods, the first configuration comprises configuring the wireless circuitry to: 
 send TDD uplink data to the wireless network via the first TDD communication link through a first antenna of the multiple antennas; and 
 receive first TDD downlink data from the wireless network via the second TDD communication link through a second antenna of the multiple antennas; and 
 during second time periods, the second configuration comprises reconfiguring the wireless circuitry to: 
 receive second TDD downlink data from the wireless network via the first TDD communication link through the first and second antennas; and 
 refrain from transmitting uplink data to the wireless network via the second TDD communication link, 
 wherein the TDD uplink data is transmitted from the wireless communication device at the same time the first TDD downlink data is received at the wireless communication device during the first time periods, and 
 wherein the first TDD downlink data is the GSM paging communication, the TDD uplink data is a time-division Long Term Evolution (TD-LTE) data transmission to the wireless network, the second TDD downlink data is a TD-LTE data transmission from the wireless network, and communication by the wireless network of the GSM paging communication to the mobile device is coordinated to align with TDD uplink subframe TTIs of the TD-LTE data frames. 
 
     
     
       6. The wireless communication device of  claim 5 , wherein the first TDD communication link is established using a first radio communication channel and the second TDD communication link is established using a second radio communication channel having different assigned radio frequency spectrum than the first radio communication channel. 
     
     
       7. The wireless communication device of  claim 5 , wherein the second TDD downlink data is received at the wireless communication device in multiple coordinated data transmissions using Long Term Evolution (LTE) multiple-input and multiple-output (MIMO) antenna diversity. 
     
     
       8. The wireless communication device of  claim 5 , wherein execution of the computer-executable instructions by the one or more processors further cause the wireless communication device to:
 responsive to receipt of the GSM paging communication addressed to the wireless communication device: 
 establish a GSM voice call via the second TDD communication link; and 
 discontinue TD-LTE uplink and downlink communication via the first TDD communication link during the GSM voice call. 
 
     
     
       9. A non-transitory storage device storing computer-executable instructions that, when executed by one or more processors, causes a wireless communication device to:
 establish a first time division duplex (TDD) communication link and a second TDD communication link with a wireless network; and 
 alternate between a first configuration and a second configuration in consecutive sequential time periods corresponding to subframe transmission time intervals (TTIs) of time-division Long Term Evolution (TD-LTE) data frames while listening for a Global System for Mobile (GSM) paging communication addressed to the wireless communication device; 
 wherein: 
 during first time periods, the first configuration comprises configuring wireless circuitry including a transceiver and switchable radio frequency front end coupled to multiple antennas to: 
 send TDD uplink data to the wireless network via the first TDD communication link through a first antenna of the multiple antennas; and 
 receive first TDD downlink data from the wireless network via the second TDD communication link through a second antenna of the multiple antennas; and 
 during second time periods, the second configuration comprises reconfiguring the wireless circuitry to: 
 receive second TDD downlink data from the network via the first TDD communication link through the first and second antennas; and 
 refrain from transmitting uplink data to the network via the second TDD communication link, 
 wherein a portion of the TDD uplink data is transmitted from the wireless communication device at the same time a portion of the first TDD downlink data is received at the wireless communication device during the first time periods, and 
 wherein the first TDD downlink data is the GSM paging communication, the TDD uplink data is a time-division Long Term Evolution (TD-LTE) data transmission to the wireless network, the second TDD downlink data is a TD-LTE data transmission from the wireless network, and communication by the wireless network of the GSM paging communication to the mobile device is coordinated to align with TDD uplink subframe TTIs of the TD-LTE data frames. 
 
     
     
       10. The non-transitory storage device of  claim 9 , wherein the second TDD downlink data is received in multiple coordinated data transmissions using Long Term Evolution (LTE) multiple-input and multiple-output (MIMO) antenna diversity. 
     
     
       11. The method of  claim 1 , wherein:
 the second TDD downlink data comprises a first TD-LTE data transmission and a second TD-LTE data transmission; 
 the mobile device receives the first TD-LTE data transmission at the first antenna of the multiple antennas via the first TDD communication link; and 
 the mobile device receives the second TD-LTE data transmission at the second antenna of the multiple antennas via the first TDD communication link. 
 
     
     
       12. The wireless communication device of  claim 5 , wherein:
 the second TDD downlink data comprises a first TD-LTE data transmission and a second TD-LTE data transmission; 
 the wireless communication device receives the first TD-LTE data transmission at the first antenna of the multiple antennas via the first TDD communication link; and 
 the wireless communication device receives the second TD-LTE data transmission at a second antenna of the multiple antennas via the first TDD communication link. 
 
     
     
       13. The non-transitory storage device of  claim 9 , wherein:
 the second TDD downlink data comprises a first TD-LTE data transmission and a second TD-LTE data transmission; 
 the wireless communication device receives the first TD-LTE data transmission at the first antenna of the multiple antennas via the first TDD communication link; and 
 the wireless communication device receives the second TD-LTE data transmission at the second antenna of the multiple antennas via the first TDD communication link. 
 
     
     
       14. The non-transitory storage device of  claim 9 , wherein the execution of the computer-executable instructions by the one or more processors further cause the wireless communication device to:
 responsive to receipt of the GSM paging communication addressed to the wireless communication device: 
 establish a GSM voice call via the second TDD communication link; and 
 discontinue TD-LTE uplink and downlink communication via the first TDD communication link during the GSM voice call.

Description:
FIELD 
     The described embodiments generally relate to wireless communications, and more particularly, to apparatus and methods for efficiently transmitting synchronous data within time division duplex (TDD) telecommunication networks. 
     BACKGROUND 
     In digital communications, time division duplexing (TDD) typically emulates full-duplex communication over a half-duplex communication link, where uplink (UL) and downlink (DL) communications can be transmitted at different times, in a coordinated manner. Some telecommunication radio access technologies (RATs) that support TDD include devices and technologies that are compatible with Global System for Mobile (GSM) communications, Universal Mobile Telecommunications Systems (UMTS), Code Division Multiple Access (CDMA), Long Term Evolution (LTE), and extensions, advancements, or derivations thereof. Regardless of a selected RAT deployment, TDD bit stream communications occur within sequential data frames having individual, alternating time slots that can be scheduled for UL or DL data transmissions using the same frequency resource. 
     More recently, TD-LTE (i.e., TDD LTE) was standardized by an international coalition of companies, in an effort to migrate time division synchronous code division multiple access (TD-SCDMA, developed in the People&#39;s Republic of China) RATs to fourth generation (4G) LTE, as specified by the third generation partnership project (3GPP). Modern LTE protocols support frequency division duplexing (FDD) using paired spectrum and TDD using unpaired spectrum. Dual-mode mobile devices are being developed to support both FDD and TDD within a single RAT. However, mobile devices are presently limited to performing TDD operations using a single RAT per device transceiver, without performing time division switching operations between RATs, a procedure which is not “simultaneous” by definition. 
     Accordingly, there remains a need for developing technologies that support simultaneous TDD transmissions across multiple RATs at a mobile device that is configured with a single transceiver. Further, it would be beneficial if TD-LTE technologies were developed to support carrier aggregation in the time domain for similar devices using multiple TDD communication links. Numerous communication scenarios exist that would benefit from these technological advancements, some of which are described further herein. 
     SUMMARY 
     Various embodiments disclosed herein provide for apparatus and methods that perform simultaneous time division duplex (TDD) communications. In accordance with some scenarios, a procedure can be performed at a wireless communication device, e.g., a mobile device, which includes, but is not limited to including, establishing a first TDD communication link and a second TDD communication link with a network, e.g., a telecommunication network. In some scenarios, the first TDD communication link may be established with the network before, after, or at the same time that the second TDD communication link is established with the network, depending on various network and/or device communication considerations. Thereafter, TDD uplink (UL) data can be sent to the network via the first TDD communication link or the second TDD communication link, and TDD downlink (DL) data can be received from the network via the first TDD communication link or the second TDD communication link. 
     In some configurations, a portion of (a subset of, or all of) the TDD UL data may be transmitted from the mobile device to the network at the same time a portion of (a subset of, or all of) the TDD DL data can be received at the mobile device from the network, via different communication links, i.e., either via the first TDD communication link or via the second TDD communication link. In this instance, the transmission of TDD UL data can occur simultaneously with the transmission of TDD DL data, by utilizing multiple TDD communication links for the corresponding TDD communications, e.g., at the same time. 
     In accordance with one aspect, the TDD DL data can be received at a mobile device in multiple, coordinated data transmissions using Long Term Evolution (LTE) multiple-input and multiple-output (MIMO) antenna diversity. For example, in some configurations, a mobile device may be configured with multiple antennas, and the TDD DL data can include both a first time division Long Term Evolution (TD-LTE) data transmission and a second TD-LTE data transmission. In such an arrangement, the mobile device may receive the first TD-LTE data transmission at a first antenna of the multiple antennas via the first TDD communication link, and the mobile device can also receive the second TD-LTE data transmission at a second antenna of the multiple antennas via the first TDD communication link, e.g., at the same time. 
     In some aspects, the TDD UL data may include a TD-LTE data transmission or a time division Synchronous Code Division Multiple Access (TD-SCDMA) data transmission, and the mobile device can further send the TDD UL data from a third antenna of the multiple antennas via the second TDD communication link, at the same time the mobile device receives both the first TD-LTE data transmission and the second TD-LTE data transmission. 
     In accordance with some scenarios, the TDD DL data may be a Global System for Mobile (GSM) paging communication that is received via the second TDD communication link, and the TDD UL data may be a TD-LTE communication that is sent via the first TDD communication link. In this arrangement, the mobile device can establish a GSM voice call via the second TDD communication link in response to receiving the GSM paging communication, and the mobile device can discontinue the TD-LTE communication via the first TDD communication link during the GSM voice call, when technologically necessary, e.g., based on a mobile device&#39;s hardware and firmware capability. 
     In accordance with various aspects, the TDD DL data may include a first TD-LTE data transmission and a second TD-LTE data transmission, and the TDD UL data may include a third TD-LTE data transmission. In this configuration, the mobile device can receive the first TD-LTE data transmission and the second TD-LTE data transmission via the first TDD communication link, and send the third TD-LTE data transmission via the second TDD communication link, e.g., at the same time. 
     In some configurations, in response to a TDD switching operation, e.g., during subsequent, consecutive TD-LTE time slots on the DL and on the UL, the mobile device can receive the first TD-LTE data transmission and the second TD-LTE data transmission via the second TDD communication link, and send the third TD-LTE data transmission via the first TDD communication link. As would be understood by those having ordinary skill in the art, this configuration can enable carrier aggregation in the time domain for TD-LTE compliant wireless communication devices. 
     In one scenario, a wireless communication device may be configured with a radio transceiver that supports simultaneous TDD communications using multiple TDD communication links, one or more processors, and a storage device storing computer-executable instructions. In this arrangement, the one or more processors may execute the computer-executable instructions to cause the wireless communication device to establish a first TDD communication link and a second TDD communication link with a network, send TDD UL data to the network via the first TDD communication link, and then receive TDD DL data from the network via the second TDD communication link. The TDD UL data (or a portion thereof) can be transmitted from the wireless communication device at the same time the TDD DL data (or a portion thereof) is received at the wireless communication device, using similar TDD time slot resources of the first TDD communication link and the second TDD communication link. 
     In accordance with various aspects, the first TDD communication link may be established using a first radio communication channel and the second TDD communication link may be established using a second radio communication channel having different assigned radio frequency spectrum than the first radio communication channel. 
     In some configurations, the TDD DL data may be a Global System for Mobile (GSM) paging communication that is received via the second TDD communication link, and the execution of the computer-executable instructions by the one or more processors can cause the wireless communication device to establish a GSM voice call via the second TDD communication link in response to receiving the GSM paging communication. 
     In accordance with another scenario, a non-transitory storage device can store computer-executable instructions that, when executed by one or more processors of the wireless communication device, causes a wireless communication device to establish a first TDD communication link and a second TDD communication link with a network, send TDD UL data to the network via the first TDD communication link, and receive TD-LTE downlink data from the network via the second TDD communication link. In this configuration, a portion of (a subset of, or all of) the TDD UL data may be transmitted from the wireless communication device at the same time a portion of (a subset of, or all of) the TD-LTE DL data is received at the wireless communication device, via different TDD communication links. 
     In various configurations, the TD-LTE DL data may be received in multiple coordinated data transmissions using LTE MIMO antenna diversity. 
     In accordance some aspects of the disclosure, the TDD UL data can include a TD-LTE data transmission or a TD-SCDMA data transmission. Further, the TD-LTE DL data may include a first TD-LTE data transmission and a second TD-LTE data transmission, and the TDD UL data may include a third TD-LTE data transmission. In this arrangement, the execution of the computer-executable instructions can cause the wireless communication device to receive the first TD-LTE data transmission and the second TD-LTE data transmission via the first TDD communication link, and send the third TD-LTE data transmission via the second TDD communication link, e.g., at the same time. 
     Thereafter, and in response to a TDD switching operation, the execution of the computer-executable instructions can cause the wireless communication device to receive the first TD-LTE data transmission and the second TD-LTE data transmission via the second TDD communication link, and send the third TD-LTE data transmission via the first TDD communication link, e.g., at the same time. 
     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 
       The described embodiments, and the attendant advantages thereof, may best be understood by referencing the corresponding description for the figures identified below, in conjunction with the illustrations in the accompanying drawings. The subject matter depicted in the drawings, is included solely for illustrative purposes, and is in no way intended to overly limit the scope or meaning of this disclosure. As such, it should be understood that various changes in form and detail can be made to the drawings, as would be anticipated by those having ordinary skill in the art, and such modification would not depart from the spirit and scope of the corresponding disclosure. 
         FIG. 1  illustrates a heterogeneous Long Term Evolution (LTE) wireless communication system, in accordance with some embodiments of the disclosure. 
         FIG. 2  depicts a block diagram of a network apparatus, in accordance with various embodiments of the disclosure. 
         FIG. 3  illustrates a block diagram of a mobile device, in accordance with some embodiments of the disclosure. 
         FIG. 4  depicts an LTE-Uu Interface, in accordance with various embodiments of the disclosure. 
         FIG. 5  illustrates a diagram of a single Time Division Duplex (TDD) data frame for the uplink (UL) and the downlink (DL), in accordance with some embodiments of the disclosure. 
         FIG. 6A  depicts a first state of a dual TDD link paging scan operation for a mobile device with two or more antennas, in accordance with various embodiments of the disclosure. 
         FIG. 6B  illustrates a second state of the dual TDD link paging scan operation for the mobile device with two or more antennas of  FIG. 6A , in accordance with some embodiments of the disclosure. 
         FIG. 6C  depicts a timing diagram showing the first and the second states of the dual TDD link paging scan operation of  FIGS. 6A-B , in accordance with various embodiments of the disclosure. 
         FIG. 7A  illustrates a first state of a dual TDD link data transmission for a mobile device with two or more antennas, in accordance with some embodiments of the disclosure. 
         FIG. 7B  depicts a second state of the dual TDD link data transmission for the mobile device with two or more antennas of  FIG. 7A , in accordance with various embodiments of the disclosure. 
         FIG. 7C  illustrates a timing diagram showing the first and the second states of the dual TDD link data transmission of  FIGS. 7A-B , in accordance with some embodiments of the disclosure. 
         FIG. 8A  depicts a first state of a dual TDD link data transmission for a mobile device with three or more antennas, in accordance with various embodiments of the disclosure. 
         FIG. 8B  illustrates a second state of the dual TDD link data transmission for the mobile device with three or more antennas of  FIG. 8A , in accordance with some embodiments of the disclosure. 
         FIG. 8C  depicts a timing diagram showing the first and the second states of the dual TDD link data transmission of  FIGS. 8A-B , in accordance with various embodiments of the disclosure. 
         FIG. 9A  illustrates a first state of an Inter-Band time division LTE (TD-LTE) carrier aggregation data transmission for a mobile device with three or more antennas, in accordance with some embodiments of the disclosure. 
         FIG. 9B  depicts a second state of the Inter-Band TD-LTE carrier aggregation data transmission for the mobile device with three or more antennas of  FIG. 9A , in accordance with various embodiments of the disclosure. 
         FIG. 9C  illustrates a timing diagram showing the first and second states of the Inter-Band TD-LTE carrier aggregation data transmission of  FIGS. 9A-B , in accordance with some embodiments of the disclosure. 
         FIG. 10  depicts a flow diagram of a procedure for a dual TDD link paging scan operation, in accordance with various embodiments of the disclosure. 
         FIG. 11  illustrates a flow diagram of a procedure for a dual TDD link data transmission, in accordance with some embodiments of the disclosure. 
         FIG. 12  depicts a flow diagram of another procedure for a dual TDD link data transmission, in accordance with various embodiments of the disclosure. 
         FIG. 13  depicts a flow diagram of a procedure for Inter-Band TD-LTE carrier aggregation, in accordance with various embodiments of the disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Representative examples for implementing simultaneous operation of multiple time division duplex (TDD) communication links at a single-transceiver device are described within this section. Additionally, various examples for performing legacy TDD paging operations during TDD data transmissions and time division Long Term Evolution (TD-LTE) multiple-input and multiple-output (MIMO) based data transmissions, including TD-LTE carrier aggregation communications, are also described herein. These examples are provided to add context to, and to aid in the understanding of, the cumulative subject matter of this disclosure. It should be apparent to one having ordinary skill in the art that the present disclosure may be practiced with or without some of the specific details described herein. Further, various modifications or alterations can be made to the subject matter described herein, and illustrated in the corresponding figures, to achieve similar advantages and results, without departing from the spirit and scope of the disclosure. 
     Further, references are made in this section to the accompanying figures, which form a part of the disclosure and in which are shown, by way of illustration, various implementations corresponding to the described embodiments herein. Although the embodiments and scenarios of this disclosure are described in sufficient detail to enable one having ordinary skill in the art to practice the described implementations, it should be understood that these examples are not to be construed as being overly-limiting or all-inclusive. 
     In accordance with various embodiments described herein, the terms “wireless communication device,” “wireless device,” “mobile device,” “mobile station,” and “user equipment” (UE) may be used interchangeably herein to describe one or more common 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 MiFi® 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), and/or 5G or other present or future developed advanced cellular wireless networks. 
     The wireless communication 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 communication 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. 
     In various implementations, a UE that is compliant with multiple, different communication protocols (e.g., including various TDD communication protocols) can operate as a multi-mode device by communicating within a 4G network cell employing any common type of LTE or LTE-A radio access technology (RAT), as well as within a 3G or 2G network cell employing any common type of legacy RAT. In some scenarios, a corresponding multi-mode communication device can be configured to prefer attachment to an LTE network offering faster data rate throughput, as compared to other 3G or 2G legacy networks offering lower data rate throughput. In other scenarios, a mobile device may be configured to communicate with any conceivable mixture of 4G, 3G, and 2G network RATs at the same time or in a time-varying manner. 
     As will be described in further detail, in some embodiments, a TDD-compliant wireless communication device may be able to conduct more than one data transmission at a time using different radio communication channel resources that can be associated with different TDD RAT types. By way of example, in some embodiments, different TDD RAT types may include devices and technologies that are compatible with TD-LTE, time division Synchronous Code Division Multiple Access (TD-SCDMA), Global System for Mobile (GSM), Enhanced Data rates for GSM Evolution (EDGE), etc. Further, in various implementations, a TDD-compliant mobile device may be configured to simultaneously utilize multiple TDD communication channels corresponding to the same RAT type, to support carrier aggregation in the time domain. This adaptation is particularly beneficial for TD-LTE devices, which have a MIMO antenna diversity requirement on the downlink (DL). 
     For example, two or more antennas are required at a TD-LTE compliant UE for the UE to be able to receive multi-path MIMO DL communications (e.g., by employing spatial multiplexing techniques) from a network base station, i.e., an enhanced NodeB (eNodeB), such that a DL throughput requirement associated with the LTE telecommunication standard can be theoretically achieved. In this regard, a mobile device must utilize at least two of its antennas at the same time (e.g., during the same time slot resources) to cumulatively receive LTE DL data (e.g., downlink shared channel (DL-SCH) data) in the time domain. Accordingly, in some embodiments, a TD-LTE wireless communication device may be configured with two, three, or four antennas to support various MIMO spatial multiplexing communication techniques. It should be understood that the TD-LTE mobile devices described herein are not limited to being configured with only four antennas; in various implementations TD-LTE UEs may have more than four antennas to support increased data throughput rates and/or improved wireless data communication redundancy. 
       FIG. 1  depicts a heterogeneous wireless communication system  100  that is compliant with the 3GPP Evolved Universal Terrestrial Radio Access (E-UTRA) air interface, and includes, but is not limited to including, multiple LTE and/or LTE-A network cells  102   a - c  respectively having at least one eNodeB network base station. In various network arrangements, the eNodeB base stations of the LTE/LTE-A cells  102   a - c  can be configured to communicate between and amongst each other using an LTE-X2 interface(s). Further, the E-UTRA compliant communication system  100  can include any number of mobility management entities (MMEs) and serving gateways (S-GWs)  106   a - c , PDN gateways (P-GWs)  108 , etc., which, as part of the evolved packet core (EPC), can communicate with any of the LTE/LTE-A cell  102   a - c  eNodeBs using an LTE-S1 interface(s). 
     In various embodiments, the heterogeneous system  100  may also be compliant with any number of 3G or 2G air interfaces, and as such, the system  100  can include any number of 3G legacy network cells  112   a - b , as well as any number 2G legacy network cells  114 . Additionally, the heterogeneous wireless communication system  100  may include multiple UEs  104  that can be respectively provided wireless telecommunication service by any of the LTE/LTE-A network cells  102   a - c , as well as by any of the 3G or 2G legacy network cells,  112   a - b  and  114 , at any particular time, based in part on a corresponding UE&#39;s  104  geographic location within the heterogeneous wireless communication system  100 . 
     By way of example, a TD-LTE compliant UE  104  may be located within an LTE/LTE-A network cell  102   a  when the UE  104  initiates an Internet Protocol (IP) data download. The UE  104  can thereby establish communications with a serving TD-LTE eNodeB within its LTE/LTE-A network cell  102   a . Then, the corresponding eNodeB can coordinate a data transfer through the EPC,  106   a - c  and  108 , from the Internet  110  to allow the TD-LTE compliant UE  104  to download the requested packet-based IP data. In various implementations, the data transmitted from the eNodeB of LTE/LTE-A cell  102   a  to the UE  104  is transmitted over an LTE-Uu interface, and this data may be transmitted using MIMO spatial multiplexing techniques, such that multiple radio frequency (RF) chains associated with multiple DL data streams can be communicated to the UE via the same TDD communication link, at the same time. 
       FIG. 2  depicts a block diagram of a network apparatus  200  (e.g., an eNodeB, a NodeB, or another common type of network entity), in accordance with various embodiments of the disclosure. In various implementations, the network apparatus  200  may be configured with a network resource manager  212  having a timing control component  214 , a UL/DL transmission scheduling component  216 , and optionally, a carrier coordination/assignment component  218  that can be employed by the network apparatus  200  in various carrier aggregation arrangements, described further herein with respect to  FIGS. 9 a - c   . In some configurations, the network apparatus  200  may utilize the timing controller component  214  of its network resource manager  212  to coordinate time slot assignments while scheduling data transmissions for multiple TDD communication links. 
     In various embodiments, the network apparatus  200  may employ the UL/DL transmission scheduling component  216  of its network resource manager  212  to schedule TDD data transmissions over sequential TDD data frames that have individual, alternating time slots. As will be described further herein with respect to  FIGS. 5, 6   c ,  7   c ,  8   c  and  9   c , these TDD time slots can be allocated for alternating DL and UL data transmissions using the same frequency resource on the same TDD communication link. Additionally, the UL/DL transmission scheduling component  216  of the network resource manager  212  may also be configured to schedule the TDD time slots of multiple TDD communication links, in such a manner that multiple TDD communications can occur at the same time for a designated wireless communication device (e.g., to communicate with a UE using two TDD links, simultaneously). 
     In some configurations, the network apparatus  200  (e.g., an eNodeB) may include processing circuitry  202  that can perform various TDD scheduling actions, in accordance with one or more embodiments disclosed herein. In this regard, the processing circuitry  202  can be configured to perform and/or control performance of one or more functionalities of the network apparatus  200  in accordance with various embodiments, and thus, the processing circuitry  202  can perform various network resource and communication scheduling procedures of the network apparatus  200  in accordance with various implementations of the disclosure. The processing circuitry  202  may further be configured to perform data processing, application execution and/or other control and management functions according to one or more embodiments of the disclosure. 
     The network apparatus  200 , or portions or components thereof, such as the processing circuitry  202 , may also include one or more chipsets that can respectively include any number of coupled microchips thereon. The processing circuitry  202  and/or one or more other components of the network apparatus  200  may also be configured to implement functions associated with various TDD communication link scheduling procedures and TDD communications using its multiple chipsets. In some embodiments, the network apparatus  200  may be associated with, or employed as, an eNodeB of an LTE/LTE-A network cell  102   a - c  to operate within the heterogeneous wireless communication system  100  of  FIG. 1 . In this arrangement, the network apparatus  200  may include one or more chipsets configured to enable the network apparatus  200  to operate within the heterogeneous system  100  as a network base station, providing wireless communications service to any number of UEs  104  located within its corresponding wireless coverage area(s) (e.g., coverage areas associated with the LTE/LTE-A network cells  102   a - c ). 
     In some configurations, the processing circuitry  202  of the network apparatus  200  may include one or more processor(s)  204  and a memory component  206 . Further, the processing circuitry  202  may be in communication with, or otherwise coupled to, a radio frequency (RF) circuit  208  having a TDD compliant modem and one or more wireless communication transceivers  210 . In various implementations, the RF circuit  208  including the modem and the one or more transceivers  210  may be configured to communicate using different TDD RAT types. For instance, in some embodiments the RF circuit  208  may be configured to communicate using an LTE RAT, and in other embodiments, the RF circuit  208  may be configured to communicate using a TD-SCDMA RAT, an EDGE RAT, a GSM RAT, or any other TDD RAT type. 
     In various implementations, the processor(s)  204  may be configured and/or employed in a variety of different forms. For example, the processor(s)  204  may be associated with any number of microprocessors, co-processors, controllers, or various other computing or processing implements, including integrated circuits such as, for example, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or any combination thereof. In various arrangements, multiple processors  204  can be coupled to and/or configured in operative communication with each other, and these hardware components may be collectively configured to perform one or more procedures of the network apparatus  200  as described herein, in the form of an eNodeB, a MME, or another network entity having corresponding control capability. 
     In some scenarios, the processor(s)  204  can be configured to execute instructions (e.g., computer-executable instructions) that may be stored in the memory  206 , or that is otherwise accessible to the processor(s)  204  at some other device storage location. As such, whether configured as, or in conjunction with, hardware or a combination of hardware and software, the processor(s)  204  of the processing circuitry  202  may be capable of performing TDD communication operations according to various embodiments described herein, when configured accordingly. 
     In some implementations, the memory  206  of the processing circuitry  202  may include multiple memory devices that can be associated with any common volatile or non-volatile memory type. In some scenarios, the memory  206  may be associated with a non-transitory computer-readable storage medium that can store various computer program instructions which may be executed by the processor(s)  204  during normal firmware or application executions. In this regard, the memory  206  can be configured to store information, data, applications, instructions, or the like, for enabling the network apparatus  200  to carry out various TDD communication functions in accordance with one or more embodiments of the disclosure. In some configurations, the memory  206  may be in communication with, and coupled to, the processor(s)  204  of the processing circuitry  202 , as well as to one or more system buses for passing information between and amongst the different device components of the network apparatus  200 . 
     It should be appreciated that not all of the components, device elements, and hardware illustrated in, and described with respect to, the network apparatus  200  of  FIG. 2  may be essential to this disclosure, and thus, some of these items may be omitted, consolidated, or otherwise modified within reason. Additionally, in some implementations, the subject matter associated with the network apparatus  200  can be configured to include additional or substitute components, device elements, or hardware, beyond those that are shown within  FIG. 2 . 
       FIG. 3  illustrates a block diagram of a wireless communication device  300  (e.g., a TDD compliant UE), having an RF circuit  308  with a transceiver and a TDD compliant modem  310 , as well as, a device resource manager  312  including an antenna switch control component  314  and an UL transmission scheduling component  316 , in accordance with some embodiments of the disclosure. In various configurations, the wireless communication device  300  may include processing circuitry  302  that can perform various TDD communication operations, described further herein with respect to  FIGS. 6 a   - 13 . In some embodiments, the processing circuitry  302  can employ the antenna switch control component  314  of its device resource manager  312  to switch between multiple antennas (e.g., two, three, or four antennas) to transmit (Tx) and/or receive (Rx) various TDD communications on the UL or the DL. 
     However, it should be understood that this antenna switching functionality may likewise be incorporated within the RF circuit  308  of the mobile device  300 , in any particular arrangement, without departing from the spirit and scope of the disclosure. Further, the processing circuitry  302  of the wireless communication device  300  can be configured to employ the UL transmission scheduling component  316  of its device resource manager  312  to perform various UL TDD data transmissions over one or more TDD communication link(s), in coordination with various DL TDD data transmissions that can be scheduled at a corresponding network apparatus  200  (e.g., via the UL/DL transmission scheduling component  216  of the network resource manager  212 ). 
     In some embodiments, the wireless communication device  300  (e.g., a TD-LTE compliant UE) may include processing circuitry  302  that can perform various TDD communications, in accordance with various device configurations disclosed herein. In this regard, the processing circuitry  302  can be configured to perform and/or control performance of one or more functionalities of the wireless communication device  300 , and thus, the processing circuitry  302  can perform various antenna switching (e.g., via the antenna switch control component  314 ) and TDD data communication procedures of the wireless communication device  300 , optionally, in collaboration with instructions or feedback from the network apparatus  200 . The processing circuitry  302  may further be configured to perform data processing, application execution and/or other control and management functions according to one or more embodiments of the disclosure. 
     The wireless communication device  300 , or portions or components thereof, such as the processing circuitry  302 , may also include one or more chipsets that can respectively include any number of coupled microchips thereon. The processing circuitry  302  and/or one or more other components of the wireless communication device  300  may also be configured to implement functions associated with various TDD communication link data transmissions using its multiple chipsets. Additionally, in some embodiments, the wireless communication device  300  may be associated with a multi-mode, TD-LTE compliant UE  104  that is configured to operate within the heterogeneous wireless communication system  100  of  FIG. 1 . In this arrangement, the wireless communication device  300  may include one or more chipsets configured to enable the mobile device  300  to operate within its corresponding wireless coverage area (e.g., within a coverage area associated with an LTE/LTE-A network cell(s)  102   a - c ). 
     In some configurations, the processing circuitry  302  of the wireless communication device  300  may include one or more processor(s)  304  and a memory component  306 . In various implementations, the RF circuit  308 , including a modem and a single transceiver, may be configured to communicate using different TDD RAT types. For example, in some embodiments, the RF circuit  308  may be configured to communicate using an LTE RAT, and in other embodiments, the RF circuit  308  may be configured to communicate using a TD-SCDMA RAT, an EDGE RAT, a GSM RAT, or any other TDD RAT type. It should be understood that being able to perform communications using multiple TDD RATs qualify the wireless communication device  300  as a multi-mode communication device. 
     In various implementations, the processor(s)  304  may be configured and/or employed in a variety of different forms. For example, the processor(s)  304  may be associated with any number of microprocessors, co-processors, controllers, or various other computing or processing implements, including integrated circuits such as, for example, an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or any combination thereof. In various arrangements, multiple processors  304  can be coupled to and/or configured in operative communication with each other, and these hardware components may be collectively configured to perform one or more procedures of the wireless communication device  300 , as described herein, in the form of TDD compliant multi-mode communication device. 
     In some scenarios, the processor(s)  304  can be configured to execute instructions (e.g., computer-executable instructions) that may be stored in the memory  306 , or that is otherwise accessible to the processor(s)  304  at some other device storage location. As such, whether configured as, or in conjunction with, hardware or a combination of hardware and software, the processor(s)  304  of the processing circuitry  302  may be capable of performing TDD communication operations according to various embodiments described herein, when configured accordingly. 
     In some implementations, the memory  306  of the processing circuitry  302  may include multiple memory devices that can be associated with any common volatile or non-volatile memory type. In some scenarios, the memory  306  may be associated with a non-transitory computer-readable storage medium that can store various computer program instructions which may be executed by the processor(s)  304  during normal firmware or application executions. In this regard, the memory  306  can be configured to store information, data, applications, instructions, or the like, for enabling the wireless communication device  300  to carry out various TDD communication functions in accordance with one or more embodiments of the disclosure. In some configurations, the memory  306  may be in communication with, and coupled to, the processor(s)  304  of the processing circuitry  302 , as well as to one or more system buses for passing information between and amongst the different device components of the wireless communication device  300 . 
     It should be appreciated that not all of the components, device elements, and hardware illustrated in, and described with respect to, the wireless communication device  300  of  FIG. 3  may be essential to this disclosure, and thus, some of these items may be omitted, consolidated, or otherwise modified within reason. Additionally, in some implementations, the subject matter associated with the wireless communication device  300  can be configured to include additional or substitute components, device elements, or hardware, beyond those that are shown within  FIG. 3 . 
       FIG. 4  depicts an LTE-Uu interface  400  between a network apparatus  406  (e.g., an eNodeB) and a wireless communication device  402  (e.g., a TD-LTE compliant UE), in accordance with various embodiments of the disclosure. By way of example, in some implementations, the network apparatus  406  (corresponding to the network apparatus of  200  of  FIG. 2 ) may schedule one or more TDD DL data transmission(s) for a UE  402  (corresponding to the wireless communication device  300  of  FIG. 3 ) using a first TDD communication link  408 , at the same time one or more TDD UL data transmission(s) are scheduled for the same UE  402  using a second TDD communication link  410 . In accordance with various embodiments, the first TDD communication link  408  and the second TDD communication link  410  may correspond to/utilize different radio communication channels. 
     In this arrangement, multiple TDD data transmissions (for both UL and DL data) can occur at the same time using different TDD RAT types. As such, it should be understood that the network apparatus  406  may have multiple air interfaces, one of which can be associated with an E-UTRA air interface for the LTE telecommunication standard (as shown in  FIG. 4 ). In this implementation, the network apparatus  406  may be configured to support MIMO-based spatial multiplexing so that DL data transmissions comply with the LTE MIMO diversity requirement, as understood by those skilled in the art. By way of example, in some embodiments, a UE  402  can be configured with three or more antennas, and the UE  402  may be able to receive multiple MIMO DL data transmissions from the network apparatus  406  using two antennas, at the same time the UE  402  transmits an independent UL data transmission using a third antenna. However, it should be understood that numerous alternative antenna configurations can be employed at the UE  402  without departing from the spirit and scope of the disclosure. 
       FIG. 5  illustrates a diagram of a single TDD data frame  500  (e.g., a TD-LTE data frame) for both the UL  502  and the DL  504 , in accordance with some embodiments of the disclosure. As depicted in  FIG. 5 , a TDD data frame  500  consists of ten independent subframes, labeled from #0 through #9. The time duration of a standard TDD data frame  500  lasts for 10 milliseconds (ms), and as such, each subframe within a TDD data frame  500  has a transmission time interval (TTI) duration that lasts for 1 ms. Similar to frequency division duplex (FDD) data frame subframes, each TDD data frame subframe consists of two time slots having time durations of 0.5 ms each. In TD-LTE, subframes #0 and #5 are always allocated for DL transmissions, and subframes #1 and #6 are always used for synchronization between the DL  504  and the UL  502 . These subframes are considered to be “special subframes.” The remaining subframes, #2, #3, #4, #7, #8, and #9, are considered to be variable/allocatable subframes for scheduling purposes. 
     Further, a TD-LTE data frame  500  can be configured with one or two switching points or special subframe(s) for switching from the DL  504  to the UL  502 , in a coordinated manner. In this regard, some TD-LTE data frames  500  have a 5 ms switch-point periodicity, whereas other TD-LTE data frames are configured with a 10 ms switch-point periodicity, depending on a particular LTE RAT implementation. In TD-LTE communications, the same carrier frequency is used for DL  504  and UL  502  communications, and as such, both the network apparatus  200  (e.g., an eNodeB) and the wireless communication device  300  (e.g., a TD-LTE compliant UE) must periodically, and collaboratively, switch from Tx to Rx, and vice versa (from Rx to Tx), in a time-varying manner. However, it should be understood that two distinct TDD communication links can be configured to operate using different carrier frequencies corresponding to the same RAT or different RAT types. Various applications of this principal are elucidated further herein. 
     The special subframe of a TD-LTE data frame  500  is divided into three parts, consisting of a downlink part (DwPTS)  506 , a guard period (GP)  508 , and an uplink part (UpPTS)  510 . The DwPTS  506  acts as a normal downlink subframe with the exception that the DwPTS  506  has a reduced time duration (less than 1 ms), as compared to a normal subframe. The UpPTS  510  may be utilized for channel sounding or random access procedures, but not for UL data transmissions, due to the short time duration of the UpPTS  510  (which is substantially less than 1 ms). This reduced time allocation effectively provides the coordinated time resources that are necessary for the GP  508  and the UpPTS  510 . During the GP  508  neither UL nor DL data transmissions can occur, as a physical device (e.g., a network apparatus  200  or a mobile device  300 ) requires a certain amount of time to switch its RF circuitry from the DL  504  to the UL  508  (e.g., via the antenna switch control component  312 ). 
     In real-world telecommunication deployments, the GP  508  should be set in a manner such that DL  504  and UL  502  transitions do not interfere with one another at a network apparatus  200 , by advancing UL timing at a mobile device  300  (e.g., via the UL transmission scheduling component  316 ) such that, at the network apparatus  200 , the last UL subframe transmission prior to a UL/DL switch will end before the first DL subframe transmission is initiated. In various situations, the UL timing of each UE  300  can be controlled by the network apparatus  300  using a timing advance mechanism, as would be understood by those skilled in the art. Further, the GP  508  must designated in such a manner as to provide a wireless communication device  300  enough time to receive a DL transmission and then switch from Rx to Tx, before the mobile device  300  starts a subsequent UL transmission, while at the same time accounting for inter-cell interference. 
       FIG. 6A  depicts a first state (State  1 )  600  of a dual TDD link legacy paging scan operation that occurs during a TDD data transmission for a mobile device  300  with two or more antennas  608   a - b , in accordance with various embodiments of the disclosure. The RF circuit  602  of a multi-mode UE  300  is depicted in isolation to show how the switching mechanism, i.e., the RF frontend switch  606 , functions during different states of operation. In various implementations, the RF circuit  602  includes, but is not limited to including, a single transceiver and a baseband circuit  604 , which may comprise any number of RF baseband processors, and a RF front end switch  606 . It should be understood that the state diagram of  FIG. 6A  is a simplified circuit-level block diagram that does not show all of the hardware components that may be necessary for causing a UE  300  to function as described with respect to  FIGS. 6A-B . 
     In an embodiment, the RF circuit  602 , including the transceiver/baseband  604  and the RF frontend switch  606  may be configured to operate using multiple TDD RAT types (e.g., GSM and TD-LTE RAT types). For instance, in various implementations, the RF frontend switch  606  can selectively switch each of the two antennas  608   a - b  to one of a single TD-LTE transmit configuration, TD-LTE Tx1, a dual TD-LTE receive configuration, TD-LTE Rx1 and TD-LTE Rx2, a single GSM transmit configuration, GSM Tx, and a single GSM receive configuration, GSM Rx. In the first operational state (State  1 )  600 , the UE RF circuit  602  can be configured to utilize a first antenna  608   a  to receive a first TD-LTE DL data transmission utilizing the TD-LTE Rx1 configuration, and a second antenna  608   b  to receive a second TD-LTE DL data transmission utilizing the TD-LTE Rx2 configuration, from a network apparatus  612  via the same TDD communication link (Link A)  610 , at the same time (e.g., in accordance with a TD-LTE MIMO antennas diversity requirement). 
       FIG. 6B  depicts a second state (State  2 )  700  of the dual TDD link legacy paging scan operation for the mobile device  300  with two or more antennas  608   a - b  of  FIG. 6A . In the second operational state (State  2 )  700 , the UE RF circuit  602  can be configured to utilize a first antenna  608   a  to receive a GSM paging communication utilizing the GSM Rx configuration from a network apparatus  612  via a second TDD communication link (Link B)  702 , and a second antenna  608   b  to send a TD-LTE UL data transmission utilizing the TD-LTE Tx configuration from a network apparatus  612  via a first TDD communication link (Link A)  704 , at the same time. Upon receiving the GSM paging communication (e.g., a paging communication associated with a voice call), a UE  300  associated with the RF circuit  602  can accept and conduct the GSM communication (e.g., the voice call) using the GSM Rx and GSM Tx configurations. Consequently, the UE  300  may need to halt all TD-LTE data communications on the DL and the UL to switch from a packet-switched domain (associated with TD-LTE data communications) to a circuit-switched domain for handling the GSM communication (e.g., the voice call). 
       FIG. 6C  depicts a timing diagram  800  showing the first (State  1 ,  600 ) and the second states (State  2 ,  700 ) of the dual TDD link paging scan operation of  FIGS. 6A-B , in accordance with various embodiments of the disclosure. It should be understood that the UE Tx time slot allocation  802 , which is segmented as consecutive TDD UL subframe TTIs, corresponds to the TD-LTE Tx configuration of the RF circuit  602  depicted in  FIGS. 6A-B . Further, the UE Rx1 time slot allocation  804 , which is segmented as consecutive TDD DL subframe TTIs, corresponds to both the GSM Rx configuration and the TD-LTE Rx1 configuration of the RF circuit  602 , and the UE Rx2 time slot allocation  806 , which is segmented as consecutive TDD DL subframe TTIs, corresponds to the TD-LTE Rx2 configuration of the RF circuit  602 . 
     In accordance with various embodiments, while in the first state (State  1 ,  600 ), the UE Rx1 time slot allocation  804  is in a TD-LTE DL data reception mode (corresponding to the TD-LTE Rx1 configuration), and at the same time, the UE Rx2 time slot allocation  806  is also in a TD-LTE DL data reception mode (corresponding to the TD-LTE Rx2 configuration). In this arrangement, the RF circuit  602  is configured to receive a TD-LTE MIMO DL data transmission from the network apparatus  612  using both of its two antennas  608   a - b . Subsequently, while in the second state (State  2 ,  700 ), the UE Tx time slot allocation  802  is in a TD-LTE UL data transmission mode (corresponding to the TD-LTE Tx configuration), when the UE Rx1 time slot allocation  804  is a GSM DL reception mode (corresponding to the GSM Rx configuration), e.g., when the UE  300  is listening for a GSM paging communication. In this arrangement, the RF circuit  602  is configured to transmit one TD-LTE UL data transmission at the same time the RF circuit  602  is configured to receive one GSM DL data transmission. 
       FIG. 7A  illustrates a first state (State  1 )  900  of a dual TDD link data transmission for a mobile device  300  configured with two or more antennas  908   a - b , in accordance with some embodiments of the disclosure. The RF circuit  902  of a multi-mode UE  300  is depicted in isolation to show how the switching mechanism, i.e., the RF frontend switch  906 , functions during different states of operation. In various implementations, the RF circuit  902  includes, but is not limited to including, a single transceiver and a baseband circuit  904 , which may comprise any number of RF baseband processors, and a RF front end switch  906 . It should be understood that the state diagram of  FIG. 7A  is a simplified circuit-level block diagram that does not show all of the hardware components that may be necessary for causing a UE  300  to function as described with respect to  FIGS. 7A-B . 
     In an embodiment, the RF circuit  902 , including the transceiver/baseband  904  and the RF frontend switch  906  may be configured to operate using multiple TDD RAT types (e.g., GSM and TD-SCDMA RAT types). For instance, in various implementations, the RF frontend switch  906  can selectively switch each of the two antennas  908   a - b  to one of a single TD-SCDMA transmit configuration, TD-SCDMA Tx, a dual TD-SCDMA receive configuration, TD-SCDMA Rx1 and TD-SCDMA Rx2, a single GSM transmit configuration, GSM Tx, and a single GSM receive configuration, GSM Rx. In the first operational state (State  1 )  900 , the UE RF circuit  902  can be configured to utilize a first antenna  908   a  to receive a GSM DL data transmission utilizing the GSM Rx configuration from a network apparatus  914  via a second TDD communication link (Link B)  910 , and a second antenna  908   b  to send a TD-SCDMA UL data transmission utilizing the TD-SCDMA Tx configuration to a network apparatus  914  via a first TDD communication link (Link A)  912 , at the same time. 
       FIG. 7B  depicts a second state (State  2 )  1000  of the dual TDD link data transmission for the mobile device  300  configured with two or more antennas  908   a - b  of  FIG. 7A . In the second operational state (State  2 )  1000 , the UE RF circuit  902  can be configured to utilize a first antenna  908   a  to send a GSM UL data transmission utilizing the GSM Tx configuration to a network apparatus  914  via a second TDD communication link (Link B)  1002 , and a second antenna  908   b  to receive a TD-SCDMA DL data transmission utilizing the TD-SCDMA Rx1 configuration from a network apparatus  914  via a first TDD communication link (Link A)  1004 , at the same time. 
       FIG. 7C  depicts a timing diagram  1100  showing the first (State  1 ,  900 ) and the second states (State  2 ,  1000 ) of the dual TDD link data transmission of  FIGS. 7A-B , in accordance with various embodiments of the disclosure. It should be understood that the UE Tx time slot allocation  1102 , which is segmented as consecutive TDD UL subframe TTIs, corresponds to both the GSM Tx configuration and the TD-SCDMA Tx configuration of the RF circuit  902  depicted in  FIGS. 7A-B . Further, the UE Rx1 time slot allocation  1104 , which is segmented as consecutive TDD DL subframe TTIs, corresponds to both the GSM Rx configuration and the TD-SCDMA Rx1 configuration of the RF circuit  902 . In this configuration, UE Rx2 time slot allocation  1006  is inactive on all TDD DL subframe TTIs. 
     In accordance with various embodiments, while in the first state (State  1 ,  900 ), the UE Tx time slot allocation  1102  is in TD-SCDMA UL data transmission mode (corresponding to the TD-SCDMA Tx configuration), at the same time the UE Rx1 time slot allocation  1104  is in a GSM DL data reception mode (corresponding to the GSM Rx configuration). Then, while in the second state (State  2 ,  1000 ) the UE Tx time slot allocation  1102  is in GSM UL data transmission mode (corresponding to the GSM Tx configuration), at the same time the UE Rx1 time slot allocation  1104  is in a TD-SCDMA DL data reception mode (corresponding to the TD-SCDMA Rx1 configuration). 
     In this arrangement, the RF circuit  902  is configured to alternate between transmitting/receiving simultaneous GSM DL data and TD-SCDMA UL data, and then after a state switch (e.g., at the RF frontend switch  906 ), receiving/transmitting simultaneous TD-SCDMA UL data and GSM DL data, in consecutive TDD subframes utilizing dual TDD communication links (Link A and Link B), at the same time. Accordingly, in this configuration, TDD DL data is always capable of being received at the RF circuit  902 , while at the same time, TDD UL data is always capable of being transmitted from the RF circuit  902 , by employing two or more TDD communication links  910  and  912 . 
       FIG. 8A  depicts a first state (State  1 )  1200  of a dual TDD link data transmission for a mobile device  300  configured with three or more antennas  1208   a - c , in accordance with various embodiments of the disclosure. The RF circuit  1202  of a multi-mode UE  300  is depicted in isolation to show how the switching mechanism, i.e., the RF frontend switch  1206 , functions during different states of operation. In various implementations, the RF circuit  1202  includes, but is not limited to including, a single transceiver and a baseband circuit  1204 , which may comprise any number of RF baseband processors, and a RF front end switch  1206 . It should be understood that the state diagram of  FIG. 8A  is a simplified circuit-level block diagram that does not show all of the hardware components that may be necessary for causing a UE  300  to function as described with respect to  FIGS. 8A-B . 
     In an embodiment, the RF circuit  1202 , including the transceiver/baseband  1204  and the RF frontend switch  1206  may be configured to operate using multiple TDD RAT types (e.g., TD-SCDMA and TD-LTE RAT types). For instance, in various implementations, the RF frontend switch  1206  can selectively switch each of the three antennas  1208   a - c  to one of a single TD-SCDMA transmit configuration, TD-SCDMA Tx, a dual TD-SCDMA receive configuration, TD-SCDMA Rx1 and TD-SCDMA Rx2, a single TD-LTE transmit configuration, TD-LTE Tx, and a dual TD-LTE receive configuration, TD-LTE Rx1 and TD-LTE Rx1. 
     In the first operational state (State  1 )  1200 , the UE RF circuit  1202  can be configured to utilize a first antenna  1208   a  to transmit a TD-SCDMA UL data transmission utilizing the TD-SCDMA Tx configuration to a network apparatus  1214  via a second TDD communication link (Link B)  1210 , a second antenna  1208   b  to receive a first TD-LTE DL data transmission utilizing the TD-LTE Rx1 configuration from a network apparatus  1214 , as well as, a third antenna  1208   c  to receive a second TD-LTE DL data transmission utilizing the TD-LTE Rx2 configuration from a network apparatus  1214  via a first TDD communication link (Link A)  1212 , at the same time (e.g., in accordance with a TD-LTE MIMO antennas diversity requirement). It should be understood that the first and second TD-LTE data transmissions, utilizing the TD-LTE Rx1 and TD-LTE Rx2 configurations, correspond to a single MIMO DL transmission. 
       FIG. 8B  depicts a second state (State  2 )  1300  of the dual TDD link data transmission for the mobile device  300  configured with three or more antennas  1308   a - b  of  FIG. 8A . In the second operational state (State  2 )  1300 , the UE RF circuit  1202  can be configured to utilize a first antenna  1208   a  to receive a first TD-SCDMA DL data transmission utilizing the TD-SCDMA Rx1 configuration from a network apparatus  1214  via a second TDD communication link (Link B)  1302 , a second antenna  1208   b  to receive a second TD-SCDMA DL data transmission utilizing the TD-SCDMA Rx2 configuration from the network apparatus  1214  via the second TDD communication link (Link B)  1302 , and a third antenna  1208   c  to transmit a TD-LTE UL data transmission utilizing the TD-LTE Tx configuration to the network apparatus  1214  via a first TDD communication link (Link A)  1304 , at the same time. 
       FIG. 8C  depicts a timing diagram  1400  showing the first (State  1 ,  1200 ) and the second states (State  2 ,  1300 ) of the dual TDD link data transmission of  FIGS. 8A-B , in accordance with various embodiments of the disclosure. It should be understood that the UE Tx time slot allocation  1402 , which is segmented as consecutive TDD UL subframe TTIs, corresponds to both the TD-SCDMA Tx configuration and the TD-LTE Tx configuration of the RF circuit  1202  depicted in  FIGS. 8A-B . Further, the UE Rx1 time slot allocation  1404 , which is segmented as consecutive TDD DL subframe TTIs, corresponds to both the TD-LTE Rx1 configuration and the TD-SCDMA Rx1 configuration of the RF circuit  1202 . Whereas the UE Rx2 time slot allocation  1406 , which is segmented as consecutive TDD DL subframe TTIs, corresponds to both the TD-LTE Rx2 configuration and the TD-SCDMA Rx2 configuration of the RF circuit  1202 . 
     In accordance with various embodiments, while in the first state (State  1 ,  1200 ), the UE Tx time slot allocation  1402  is in TD-SCDMA transmission mode (corresponding to the TD-SCDMA Tx configuration), at the same time the UE Rx1 time slot allocation  1404  is in a TD-LTE DL data reception mode (corresponding to the TD-LTE Rx1 configuration) and the UE Rx2 time slot allocation  1406  is in a TD-LTE DL data reception mode (corresponding to the TD-LTE Rx2 configuration). Then, while in the second state (State  2 ,  1300 ) the UE Tx time slot allocation  1402  is in TD-LTE transmission mode (corresponding to the TD-LTE Tx configuration), at the same time the UE Rx1 time slot allocation  1404  is in a TD-SCDMA DL data reception mode (corresponding to the TD-LTE Rx1 configuration) and the UE Rx2 time slot allocation  1406  is in a TD-SCDMA DL data reception mode (corresponding to the TD-LTE Rx2 configuration). In this arrangement, the RF circuit  1202  is configured to alternate between transmitting simultaneous TD-SCDMA UL data along with receiving dual TD-LTE DL data, and then after a switch event, transmitting simultaneous TD-LTE UL data along with receiving dual TD-SCDMA DL data, in consecutive TDD subframes utilizing dual TDD communication links (Link A and Link B), at the same time. 
       FIG. 9A  illustrates a first state (State  1 )  1500  of an Inter-Band TD-LTE carrier aggregation data transmission for a mobile device  300  that is configured with three or more antennas  1508   a - c , in accordance with some embodiments of the disclosure. The RF circuit  1502  of a multi-mode UE  300  is depicted in isolation to show how the switching mechanism, i.e., the RF frontend switch  1506 , functions during different states of operation. In various implementations, the RF circuit  1502  includes, but is not limited to including, a single transceiver and a baseband circuit  1504 , which may comprise any number of RF baseband processors, and a RF front end switch  1506 . It should be understood that the state diagram of  FIG. 9A  is a simplified circuit-level block diagram that does not show all of the hardware components that may be necessary for causing a UE  300  to function as described with respect to  FIGS. 9A-B . 
     In an embodiment, the RF circuit  1502 , including the transceiver/baseband  1504  and the RF frontend switch  1506  may be configured to operate using a single TDD RAT type (e.g., TD-LTE) over multiple communication channels (ChA and ChB, e.g., on TD-LTE channel B 38  and TD-LTE channel  41 ). For instance, in various implementations, the RF frontend switch  1506  can selectively switch each of the three antennas  1508   a - c  to one of two TD-LTE transmit configurations, TD-LTE Tx ChA and TD-LTE Tx ChB, and two of four TD-LTE receive configurations, TD-LTE Rx1 ChA, TD-LTE Rx2 ChB, TD-LTE Rx1 ChB, and TD-LTE Rx2 ChA, while in different operational states to support TD-LTE carrier aggregation over dual TDD communication links  1510  (Link B) and  1512  (Link A). 
     In the first operational state (State  1 )  1500 , the UE RF circuit  1502  can be configured to utilize a first antenna  1508   a  to transmit a TD-LTE UL data transmission utilizing the TD-LTE Tx ChA configuration to a network apparatus  1514  via a second TDD communication link (Link B)  1510 , a second antenna  1508   b  to receive a first TD-LTE DL data transmission utilizing the TD-LTE Rx1 ChB configuration from a network apparatus  1514 , as well as, a third antenna  1508   c  to receive a second TD-LTE DL data transmission utilizing the TD-LTE Rx2 ChB configuration from a network apparatus  1514  via a first TDD communication link (Link A)  1512 , at the same time (e.g., in accordance with a TD-LTE MIMO antennas diversity requirement). It should be understood that the first and second TD-LTE data transmissions, utilizing the TD-LTE Rx1 ChB and TD-LTE Rx2 ChB configurations, correspond to a single MIMO DL transmission. 
       FIG. 9B  depicts a second state (State  2 )  1600  of the Inter-Band TD-LTE carrier aggregation data transmission for a mobile device  300  that is configured with three or more antennas  1508   a - c  of  FIG. 8A . In the second operational state (State  2 )  1600 , the UE RF circuit  1502  can be configured to utilize a first antenna  1508   a  to receive a first TD-LTE DL data transmission utilizing the TD-LTE Rx1 ChA configuration from a network apparatus  1514 , as well as, a second antenna  1508   b  to receive a second TD-LTE DL data transmission utilizing the TD-LTE Rx2 ChA configuration from a network apparatus  1514  via a second TDD communication link (Link B)  1602 , at the same time (e.g., in accordance with a TD-LTE MIMO antennas diversity requirement), as well as to send a TD-LTE UL data transmission utilizing the TD-LTE Tx ChB configuration to a network apparatus  1514  via a first TDD communication link (Link A)  1604 , simultaneously. It should be understood that the first and second TD-LTE data transmissions, utilizing the TD-LTE Rx1 ChA and TD-LTE Rx2 ChA configurations, correspond to a single MIMO DL transmission. 
       FIG. 9C  depicts a timing diagram  1700  showing the first (State  1 ,  1500 ) and the second states (State  2 ,  1600 ) of the Inter-Band TD-LTE carrier aggregation data transmission of  FIGS. 9A-B , in accordance with various embodiments of the disclosure. It should be understood that the UE Tx time slot allocation(s)  1702 , which is segmented as consecutive TDD UL subframe TTIs, corresponds to both the TD-LTE Tx ChA and the TD-LTE Tx ChB configurations of the RF circuit  1502  depicted in  FIGS. 9A-B . Further, the UE Rx1 time slot allocation  1704 , which is segmented as consecutive TDD DL subframe TTIs, corresponds to both the TD-LTE Rx1 ChA and the TD-LTE Rx2 ChB configurations of the RF circuit  1502 . Whereas the UE Rx2 time slot allocation  1706 , which is segmented as consecutive TDD DL subframe TTIs, corresponds to both the TD-LTE Rx1 ChB and TD-LTE Rx2 ChA configurations of the RF circuit  1702 . 
     In accordance with various embodiments, while in the first state (State  1 ,  1500 ), the UE Tx time slot allocation  1702  is in a TD-LTE UL data transmission mode (corresponding to the TD-LTE Tx ChA configuration), at the same time the UE Rx1 time slot allocation  1704  is in a TD-LTE DL data reception mode (corresponding to the TD-LTE Rx1 ChB configuration) and the UE Rx2 time slot allocation  1706  is in a TD-LTE DL data reception mode (corresponding to the TD-LTE Rx2 ChA configuration). Then, while in the second state (State  2 ,  1600 ) the UE Tx time slot allocation  1702  is in a TD-LTE UL data transmission mode (corresponding to the TD-LTE Tx ChB configuration), at the same time the UE Rx1 time slot allocation  1704  is in a TD-LTE DL data reception mode (corresponding to the TD-LTE Rx1 ChA configuration) and the UE Rx2 time slot allocation  1706  is in a TD-LTE DL data reception mode (corresponding to the TD-LTE Rx2 ChB configuration). 
     In this arrangement, the RF circuit  1502  is configured to alternate between transmitting simultaneous TD-LTE UL data using a first LTE communication channel (ChA) along with receiving dual TD-LTE DL data using a second LTE communication channel (ChB), and then after a switch event, transmitting simultaneous TD-LTE UL data along using a second LTE communication channel (ChB) along with receiving dual TD-LTE DL data using a first LTE communication channel (ChA), in consecutive TDD subframes utilizing dual TDD communication links (Link A and Link B), at the same time. 
       FIG. 10  depicts a flow diagram depicting various procedures  1800  for performing a dual TDD link paging scan operation during a TD-LTE data transmission, in accordance with various embodiments of the disclosure. In this regard, it should be understood that any or all of the procedures  1800  depicted in  FIG. 10  may be associated with a method, or methods, that can be implemented by the execution of computer-executable instructions (e.g., computer program code) stored in a non-transitory computer-readable memory  306  of a wireless communication device  300 , optionally in conjunction with the execution of computer-executable instructions (e.g., computer program code) stored in a non-transitory computer-readable memory  206  of an eNodeB  200  and/or any other common telecommunication network entity. 
     Initially, at operation block  1802  one or more TDD data transmission(s) may be initiated for a wireless communication device  300 . Then, at operation block  1804 , the wireless communication device  300  can receive TDD DL data via a first TDD link (e.g., via Link A) at a first antenna  608   a  using a first TDD RAT (e.g., via the TD-LTE communication standard), while at the same time, at operation block  1806 , the wireless communication device  300  can receive TDD DL data via the first TDD link (e.g., via Link A) at a second antenna  608   b  using the first TDD RAT (e.g., in accordance with a TD-LTE MIMO antennas diversity requirement). Then, at operation block  1808 , the wireless communication device  300  (and the network) can perform a TDD state switch (e.g., using the RF frontend switch  906 ). 
     Subsequently, at operation blocks  1810  and  1812 , DL paging data (e.g., relating to voice call indication) may be received via a second TDD link (e.g., via Link B) at the first antenna  608   a  using a second TDD RAT (e.g., the GSM telecommunication standard), while at the same time, TDD UL data is transmitted from the wireless communication device  300  to the network via the first TDD link (e.g., via Link A) at the second antenna  608   b , using the first TDD RAT (e.g., TD-LTE). Thereafter, at decision block  1814 , a determination is made (e.g., by a network entity  200  and/or the wireless communication device  300 ) as to whether all TDD UL and DL transmission(s) are complete. 
     In a scenario where a determination is made that all TDD UL and DL transmission(s) are complete, at decision block  1814 , the process proceeds to operation block  1818 , where all corresponding TDD data transmissions for the wireless communication device  300  are stopped. However, in a scenario, where a determination is made that all TDD UL and DL transmission(s) are not complete, at decision block  1814 , the process proceeds to operation block  1816 , where the wireless communication device  300  (and the network) can perform another TDD state switch (e.g., using the RF frontend switch  906 ). Thereafter, the procedure loops back to the simultaneous TDD Rx transmission of operation blocks  1804  and  1806 , such that further TDD DL and/or UL data transmissions can be performed for the wireless communication device  300 . It should be understood that at operation block  1810 , when an indication of a voice call has been received, TD-LTE communications may be halted so that the received voice call can be conducted. 
       FIG. 11  depicts a flow diagram showing various procedures  1900  for performing a dual TDD link data transmission, in accordance with some embodiments of the disclosure. In this regard, it should be understood that any or all of the procedures  1900  depicted in  FIG. 11  may be associated with a method, or methods, that can be implemented by the execution of computer-executable instructions (e.g., computer program code) stored in a non-transitory computer-readable memory  306  of a wireless communication device  300 , optionally in conjunction with the execution of computer-executable instructions (e.g., computer program code) stored in a non-transitory computer-readable memory  206  of network base station  200  and/or any other common telecommunication network entity. 
     Initially, at operation block  1902  one or more TDD data transmission(s) may be initiated for a wireless communication device  300 . Next, at operation block  1904 , the wireless communication device  300  may send TDD UL data to a network entity  200  (e.g., a network base station  914  of  FIG. 7A ) via a first TDD link (e.g., Link A of 912) using a first TDD RAT (e.g., the TD-SCDMA telecommunication standard), at the same time, the wireless communication device  300  receives a TDD DL data from a network entity  200  (e.g., a network base station) using a second TDD RAT (e.g., GSM). Subsequently, at operation block  1908 , the wireless communication device  300  (and the network) can perform a TDD state switch (e.g., using the RF frontend switch  906 ). 
     Then, at operation block  1910 , the wireless communication device  300  can receive TDD DL data via the first TDD link (e.g., Link A  912 ) using the first TDD RAT (e.g., TD-SCDMA), while at the same time, the wireless communication device  300  sends TDD UL data via the second TDD link (e.g., Link B  912 ) using the second TDD RAT (e.g., GSM). Next, at decision block  1914 , a determination is made (e.g., by a network entity  200  and/or the wireless communication device  300 ) as to whether all TDD UL and DL transmission(s) are complete. 
     In a scenario where a determination is made that all TDD UL and DL transmission(s) are complete, at decision block  1914 , the process proceeds to operation block  1918 , where all corresponding TDD data transmissions for the wireless communication device  300  are stopped. Alternatively, in a scenario, where a determination is made that all TDD UL and DL transmission(s) are not complete, at decision block  1914 , the process proceeds to operation block  1916 , where the wireless communication device  300  (and the network) can perform another TDD state switch (e.g., using the RF frontend switch  906 ). Thereafter, the procedure loops back to the simultaneous Tx/Rx TDD transmission of operation blocks  1904  and  1906 , such that further TDD UL and DL data transmissions are performed for the wireless communication device  300 . 
       FIG. 12  depicts a flow diagram showing other procedures  2000  for performing a dual TDD link data transmission at a mobile device  300  with three antennas, in accordance with various embodiments of the disclosure. In this regard, it should be understood that any or all of the procedures  2000  depicted in  FIG. 12  can be associated with a method, or methods, that can be implemented by the execution of computer-executable instructions (e.g., computer program code) stored in a non-transitory computer-readable memory  306  of a wireless communication device  300 , optionally in conjunction with the execution of computer-executable instructions (e.g., computer program code) stored in a non-transitory computer-readable memory  206  of an eNodeB  200  and/or any other common telecommunication network entity. 
     Initially, at operation block  2002  a first (e.g., Link A  1212  of  FIG. 8A ) and a second TDD communication link (e.g., Link B  1210 ) may be established for a mobile device  300 . Next, at operation block  2006 , the mobile device  300  may send TDD UL data to a network entity  200  (e.g., a network base station  1214 ) via the second TDD link (e.g., Link B) using a first TDD RAT (e.g., TD-SCDMA), at the same time, the wireless communication device  300  receives first and second TDD DL data from a network entity  200  via the first TDD link (e.g., Link A) using a second TDD RAT (e.g., TD-LTE), at operation blocks  2006  and  2008  (e.g., in accordance with a TD-LTE MIMO antennas diversity requirement). 
     Subsequently, at operation block  2010 , the wireless communication device  300  (and the network) can perform a TDD state switch (e.g., using the RF frontend switch  1206 ). Then, the wireless communication device  300  can receive first and second TDD DL data from a network entity  200  via the second TDD link (e.g., Link B) using the second TDD RAT (e.g., TD-LTE), at operation blocks  2012  and  2014  (e.g., in accordance with a TD-LTE MIMO antennas diversity requirement), at the same time, the wireless communication device  300  sends TDD UL data to a network entity  200  (e.g., a network base station  1214 ) via the first TDD link (e.g., Link A) using the first TDD RAT (e.g., TD-SCDMA). 
     Next, at decision block  2018 , a determination is made (e.g., by a network entity  200  and/or the wireless communication device  300 ) as to whether all TDD UL and DL transmission(s) are complete. In a scenario, where a determination is made that all TDD UL and DL transmission(s) are complete, at decision block  2018 , the process proceeds to operation block  2022 , where all corresponding TDD data transmissions for the wireless communication device  300  are stopped. Alternatively, in a scenario, where a determination is made that all TDD UL and DL transmission(s) are not complete, at decision block  2018 , the process proceeds to operation block  2020 , where the wireless communication device  300  (and the network) can perform another TDD state switch (e.g., using the RF frontend switch  1206 ). Thereafter, the procedure loops back to the simultaneous Tx/Rx TDD transmission of operation blocks  2004 ,  2006  and  2008 , such that further TDD UL and DL data transmissions are performed for the wireless communication device  300 . 
       FIG. 13  depicts a flow diagram showing various procedures  2100  for performing Inter-Band TD-LTE carrier aggregation for a UE  300 , in accordance with various embodiments of the disclosure. In this regard, it should be understood that any or all of the procedures  2100  depicted in  FIG. 13  may be associated with a method, or methods, that can be implemented by the execution of computer-executable instructions (e.g., computer program code) stored in a non-transitory computer-readable memory  306  of a UE device  300 , optionally in conjunction with the execution of computer-executable instructions (e.g., computer program code) stored in a non-transitory computer-readable memory  206  of an eNodeB  200  and/or any other common telecommunication network entity, such as an LTE MME. 
     Initially, at operation block  2102  a first (e.g., Link A  1512  of  FIG. 9A ) and a second TD-LTE communication link (e.g., Link B  1510 ) may be established for a UE  300 . Next, at operation block  2104 , the UE  300  may send TD-LTE UL data to a network entity  200  (e.g., an eNodeB  1514 ) via the second TD-LTE link (e.g., Link B  1510 ) using a first TD-LTE channel (ChA, e.g., channel B 38 ), at the same time, the UE  300  receives first and second TD-LTE DL data from the network entity  200  via the first TD-LTE link (Link A  1508 ) using a second TD-LTE channel (ChB, e.g., channel B 41 ), at operation blocks  2106  and  2108  (e.g., in accordance with a TD-LTE MIMO antennas diversity requirement). 
     Subsequently, at operation block  2110 , the UE  300  (and the network) can perform a TD-LTE state switch (e.g., using the RF frontend switch  1506 ). Then, the UE device  300  can receive first and second TD-LTE DL data from a network entity  200  via the second TD-LTE link (e.g., Link B  1602 ) using the second TD-LTE channel (ChB, e.g., channel B 41 ), at operation blocks  2112  and  2114  (e.g., in accordance with a TD-LTE MIMO antennas diversity requirement), at the same time, the UE  300  sends TD-LTE UL data to a network entity  200  via the first TD-LTE link (e.g., Link A  1604 ) using the first TD-LTE channel (ChA, e.g., channel B 38 ). 
     Next, at decision block  2118 , a determination is made (e.g., by a network entity  200  and/or the UE  300 ) as to whether all TD-LTE UL and DL transmission(s) are complete. In a scenario where a determination is made that all TD-LTE UL and DL transmission(s) are complete, at decision block  2118 , the process proceeds to operation block  2122 , where all corresponding TD-LTE data transmissions for the wireless communication device  300  are stopped. Alternatively, in a scenario, where a determination is made that all TD-LTE UL and DL transmission(s) are not complete, at decision block  2118 , the process proceeds to operation block  2120 , where the UE  300  (and the network) can perform another TDD state switch (e.g., using the RF frontend switch  1506 ). Thereafter, the procedure loops back to the simultaneous Tx/Rx TD-LTE transmission of operation blocks  2104 ,  2106  and  2108 , such that further TD-LTE UL and DL data transmissions are performed for the UE  300 . 
     It should be understood that 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-executable code/instructions that can be stored on a non-transitory computer-readable medium. The non-transitory computer-readable medium can be any data storage device that can store data, which can thereafter be read by a computer system. Examples of such a computer-readable medium include a read-only memory (ROM), a random-access memory (RAM), a compact disc (CD), a digital versatile disc (DVD), a hard disk drive (HDD), magnetic tape, or another optical data storage device. 
     The foregoing description, for purposes of explanation, used specific nomenclature to provide a comprehensive understanding of the described embodiments. However, it should be apparent to one skilled in the art that all of 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.

Metadata:
Filing Date: 20140930
Publication Date: 20210209
Grant Date: 20210209
Priority Date: 20140930
Inventors: MCDONNELL, NICHOLAS M.
LIU, HSIN-YUO
Assignee: APPLE INC
CPC Classifications: [{"code": "H04L5/001", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04W84/042", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04L5/14", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04L5/14", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04W84/042", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04B7/0413", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04B1/56", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04B7/0413", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04B7/0413", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04L5/001", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04L5/1469", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04L5/1469", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04L5/001", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04W88/06", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04B7/04", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04W84/042", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04L5/14", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04B7/0413", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04L5/001", "inventive": true, "first": false, "tree": "[]"}]
Family ID: 54200325