Patent Publication Number: US-2023142210-A1

Title: Communication for user equipment groups

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to U.S. Provisional Application No. 63/278,438, filed Nov. 11, 2021, entitled “COOPERATIVE COORDINATION SCHEMES FOR MULTI-NODE DEVICES,” the disclosure of which is hereby incorporated by reference in its entirety for all purposes. 
    
    
     BACKGROUND 
     The present disclosure relates generally to wireless communication, and more specifically to cooperative communication for user equipment in a group of user equipment. 
     User equipment density has increased rapidly over the years. As such, user equipment may support several radio access technologies (RATs) simultaneously in close proximity to one another. Moreover, with the use of high spectrum frequencies (e.g., the millimeter wave (mmW) frequency range, the terahertz (THz) frequency range, and so on), coverage range of wireless communication networks may be limited by signal loss. Additionally, communication between each user equipment and a wireless communication network may be performed through point-to-point connections without cooperation of nearby user equipment. 
     SUMMARY 
     A summary of certain embodiments disclosed herein is set forth below. It should be understood that these aspects are presented merely to provide the reader with a brief summary of these certain embodiments and that these aspects are not intended to limit the scope of this disclosure. Indeed, this disclosure may encompass a variety of aspects that may not be set forth below. 
     In yet another embodiment, an electronic device includes a transmitter, a receiver, and a processor coupled to the transmitter and the receiver. The processor transmits an access signal to a set of user equipment within a group of user equipment, transmits a set of transmission attributes associated with the access signal to the set of user equipment, and causes the set of user equipment to transmit the access signal to a base station of a wireless communication network based on the set of transmission attributes. 
     In another embodiment, a method includes receiving an access signal from a group of user equipment, transmitting an acknowledgement message to the group of user equipment via a first channel, transmitting a response message to the group of user equipment via a second channel, and causing at least one user equipment of the group of user equipment to receive the response message based on the acknowledgement message. 
     In another embodiment, one or more non-transitory, tangible, computer-readable media store instructions that cause a processor to receive a set of reference signals associated with a group of user equipment, each reference signal associated with a corresponding phase, select a reference signal from the set of reference signals based at least in part on a signal strength associated with the reference signal, transmit information associated with the reference signal to at least one user equipment of the group of user equipment, and cause the at least one user equipment to transmit the information to the group of user equipment. 
     Various refinements of the features noted above may exist in relation to various aspects of the present disclosure. Further features may also be incorporated in these various aspects as well. These refinements and additional features may exist individually or in any combination. For instance, various features discussed below in relation to one or more of the illustrated embodiments may be incorporated into any of the above-described aspects of the present disclosure alone or in any combination. The brief summary presented above is intended only to familiarize the reader with certain aspects and contexts of embodiments of the present disclosure without limitation to the claimed subject matter. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Various aspects of this disclosure may be better understood upon reading the following detailed description and upon reference to the drawings described below in which like numerals refer to like parts. 
         FIG.  1    is a block diagram of user equipment, according to embodiments of the present disclosure; 
         FIG.  2    is a functional diagram of the user equipment of  FIG.  1   , according to embodiments of the present disclosure; 
         FIG.  3    is a schematic diagram of a communication system including the user equipment of  FIG.  1    communicatively coupled to a wireless communication network supported by base stations, according to embodiments of the present disclosure; 
         FIG.  4    is a schematic diagram of a communication system including a group of user equipment communicatively coupled to the wireless communication network of  FIG.  3   , according to embodiments of the present disclosure; 
         FIG.  5    is a flowchart of a method to synchronize the group of user equipment in  FIG.  4    using the wireless communication network, according to embodiments of the present disclosure; 
         FIG.  6    is a flowchart of a method to synchronize the group of user equipment of  FIG.  4    using active user equipment of the group of user equipment, according to embodiments of the present disclosure; 
         FIG.  7    is a flowchart of a method to adjust membership of the group of user equipment of  FIG.  4   , according to embodiments of the present disclosure; 
         FIG.  8    is a flowchart of a method to share synchronization attributes with the group of user equipment of  FIG.  4    to communicate with the wireless communication network of  FIG.  3   , according to embodiments of the present disclosure; 
         FIG.  9    is a flowchart of a method to share phase synchronization data with user equipment in the group of user equipment of  FIG.  4   , according to embodiments of the present disclosure; 
         FIG.  10    is a flowchart of a method to receive radio synchronization signals from the wireless communication network of  FIG.  3   , according to embodiments of the present disclosure; 
         FIG.  11    is a flowchart of a method to receive an access response message from the wireless communication network of  FIG.  3   , according to embodiments of the present disclosure; and 
         FIG.  12    is a flowchart of a method to receive the access response message using active user equipment of the group of user equipment of  FIG.  4   , according to embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS 
     One or more specific embodiments will be described below. In an effort to provide a concise description of these embodiments, not all features of an actual implementation are described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers&#39; specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure. 
     When introducing elements of various embodiments of the present disclosure, the articles “a,” “an,” and “the” are intended to mean that there are one or more of the elements. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements. Additionally, it should be understood that references to “one embodiment” or “an embodiment” of the present disclosure are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Use of the terms “approximately,” “near,” “about,” “close to,” and/or “substantially” should be understood to mean including close to a target (e.g., design, value, amount), such as within a margin of any suitable or contemplatable error (e.g., within 0.1% of a target, within 1% of a target, within 5% of a target, within 10% of a target, within 25% of a target, and so on). Moreover, it should be understood that any exact values, numbers, measurements, and so on, provided herein, are contemplated to include approximations (e.g., within a margin of suitable or contemplatable error) of the exact values, numbers, measurements, and so on. Additionally, the term “set” may include one or more. That is, a set may include a unitary set of one member, but the set may also include a set of multiple members. Furthermore, as used herein, a set may include a portion (e.g., a subset, all) of data and/or information. While the data is described herein as including two data sets or three data sets, this is intended to be illustrative of certain embodiments. As such, the data may include any suitable number of data sets (e.g., two data sets, three data sets, four data sets, eight data sets, and so forth). Additionally, as used herein, a first set of user equipment may include the same user equipment as another set of user equipment, different user equipment than another set of user equipment, additional user equipment than another set of user equipment, fewer user equipment than another set of user equipment, and so forth. 
     The present disclosure relates generally to wireless communication, and more specifically to cooperative communication for user equipment in a group of user equipment. Wireless device density has increased rapidly over the years. Wireless communication between user equipment (UE) and wireless communication networks may occur directly through a point-to-point connection without regards to nearby user equipment. Wireless UE may also support several radio access technologies (RATs) simultaneously in close proximity to one another. Moreover, with the use of high spectrum frequencies (the millimeter wave (mmW) frequency range, the terahertz (THz) frequency range, and so on), the range of communication may be limited due to signal dissipation. Employing local communications (e.g., device-to-device communications, sidelink, peer-to-peer) may facilitate and improve the range, coverage, reliability and efficiency of communications between user equipment and wireless communication networks. This disclosure relates to systems, apparatuses, and techniques to enable user equipment to cooperate with adjacent user equipment to improve coverage and capacity. 
     User equipment may establish groups to facilitate and coordinate communication with wireless communication networks. Cooperative communication between user equipment may be beneficial for offloading data and controlling transmissions to one or more designated user equipment within a group of user equipment. Data sharing (e.g., via a device-to-device communication link) may also reduce power consumption for user equipment in the group when compared to directly (e.g., without an intervening or intermediate device) communicating with a network. Embodiments herein provide various systems, apparatuses, and techniques to provide cooperative communication for a group of user equipment. In particular, a communication network (e.g., a 5 th  generation (5G)/New Radio (NR) network, a 4 th  generation (4G)/long term evolution (LTE®) network, a 6 th  generation (6G) or greater than 6G network, and so on), via a base station, may communicate with the group of user equipment via one or more active user equipment (e.g., user equipment connected to or directly connected to the communication network). The active user equipment may communicate with passive user equipment (e.g., user equipment disconnected from the communication network). In particular, the user equipment in the group may communicate using a personal area network (PAN), a local area network (LAN) or wireless local area network (WLAN), and/or a wide area network (WAN). User equipment may establish and/or join any number of groups and may be a member of any number of groups simultaneously. 
     User equipment in close proximity with one another may transfer data and control information. For example, the user equipment may exchange data or data sets between each other. Each user equipment may receive and transmit data using RATs. The user equipment may transmit and receive data from a wireless communication network via any number of base stations or access points. A group of user equipment may include active user equipment and passive user equipment. An active user equipment connects with one or more base stations and transfers data on a wireless communication network via the base station. That is, the active user equipment may be directly connected with one or more base stations. Additionally, the active user equipment may communicate with other active user equipment and passive user equipment. Passive user equipment may not connect to any base station and/or the wireless communication network and may communicate with other passive user equipment and active user equipment (e.g., via a sidelink, peer-to-peer, or device-to-device channel). That is, the passive user equipment may communicate indirectly with the base station and/or the wireless communication network via an active user device. 
     One or more of the active user equipment may be designated as a primary user equipment. The primary user equipment may control the group membership, define configuration for a device-to-device communication link, and may add or release user equipment from the group. In particular, primary user equipment may control roles for other user equipment in a local network. For example, a first user equipment, such as a portable electronic device, may control and communicate with secondary user equipment, such as a television, a tablet, a computer, and so forth. In some instances, one or more active user equipment and one or more passive user equipment may act as relay user equipment. A relay user equipment may act as an intermediary device and may transfer data from one user equipment to another user equipment in the group. Additionally, the relay user equipment may facilitate communication with the wireless communication network by transferring (e.g., tunneling) data from the base station to other user equipment in the group. In certain embodiments, user equipment may have the same, similar, or different roles and/or responsibilities in different groups of user equipment. For example, one or more user equipment may be designated as active user equipment in a first group and may be designated as passive user equipment in a second group. Additionally or alternatively, one or more user equipment may be designated as primary user equipment and/or active user equipment in a first group and may be designated as passive user equipment and/or relay user equipment in a second group. Furthermore, one or more user equipment may have the same roles and/or responsibilities for multiple groups of user equipment. Moreover, one or more user equipment may have different roles and/or responsibilities within a group of user equipment at different times. For example, one or more user equipment may be designated as a primary user equipment and/or active user equipment at a first time and may be designated as passive user equipment and/or relay user equipment at a second time. 
     The base stations of the wireless communication network may facilitate communication and provide access for active user equipment to receive and transfer data to and from an application server and/or a communication network. In certain instances, the base stations may be operated and/or controlled by separate carriers or operators. Additionally, the base stations may operate using the same or different communication technologies, such as one or more RATs and/or local networks. 
     One or more active user equipment may receive data or a data set. The active user equipment may transmit the data or the sets of data to other active user equipment and passive user equipment in the group. That is, the active user equipment may receive the data and/or the data sets and may cooperate and coordinate to facilitate communication of the data from a base station to other user equipment. In certain instances, each active user equipment may connect to one or more base stations. Moreover, the active user equipment may receive the same and/or different data or data sets from different base stations. Additionally, the different base stations may communicate with the active user equipment using the same or different communication technologies. The passive user equipment may receive the data or the data sets from other passive user equipment and/or the active user equipment. As such, a set of the user equipment (e.g., any number of active user equipment, any number of passive user equipment, or any combination thereof) may receive the data sets either directly (e.g., from the base station) and/or indirectly (e.g., from one or more active user equipment, from one or more passive user equipment, or any combination thereof) from the wireless communication network. The user equipment in the group may assemble the data based on the data sets. 
     In certain instances, the application server may split data into one or more data sets and may transfer the one or more sets to one or more base stations. The active user equipment may receive the sets from the base stations. For example, a first active user equipment may receive a first set from a first base station and a second active user equipment may receive a second set from the second base station. The active user equipment may exchange the data sets between each other and each active user equipment may reassemble the sets to form the data. Additionally or alternatively, the base stations may split data into data sets and/or may split data sets into data subsets. 
     In some instances, a first set of the active user equipment may utilize a second set of the active user equipment to receive and transfer one or more data sets or portions of the data. In particular, the first set of the active user equipment may cooperate and coordinate to transmit the same data and/or the same data sets. Additionally or alternatively, the first set of the active user equipment may not transmit its received data set to other sets of the user equipment and may assemble multiple data sets received from the other sets of the user equipment. The first set of the active user equipment may receive one or more data sets from the second set of the active user equipment. Accordingly, only the first set of the active user equipment may receive all data sets and may reassemble the data from the data sets. Additionally, the first set of the active user equipment may transmit one or more data sets to one or more passive user equipment. Alternatively, the first set of the active user equipment may transmit the data to one or more passive user equipment. In some instances, a first passive user equipment may transmit one or more data sets or the data to a second passive user equipment. Additionally, the active user equipment may cooperate to transmit the same data set to one or more base stations simultaneously, concurrently, consecutively, overlapping, separately, and so forth. Moreover, a passive user equipment may transmit the same data set to several active user equipment for transmission to the base stations. In certain instances, the passive user equipment may transmit the same data set sequentially or broadcast concurrently to several active user equipment. 
     In order to transfer data and/or data sets consistently and efficiently, the base stations and/or the active user equipment may split the data into data sets and may transfer the data sets to user equipment within the group. The user equipment may then transfer the data and/or the data sets to other user equipment in the group using local networks and local connections. Once received, the user equipment may assemble the data sets. Data transfer, data splitting, and/or data assembly may be implemented in different layers of various communication protocols. 
     Additionally, the data may be steered to particular or target active user equipment. For example, the application server may determine a first data set to transmit to a first active user equipment, a second data set to transmit to a second active user equipment, and so forth. Additionally or alternatively, a first base station may determine a third data set to transmit to a second base station based on a connection status between the second base station and the application server. 
     In certain embodiments, the application server and/or the base stations may generate and/or provide routing information associated with the data. The routing information may include a path (e.g., sequence of user equipment that receive the data, ordering of user equipment that receive the data, and so forth). For example, the base station may generate and/or receive the routing information based on information associated with the group of user equipment. The information may include a list of device-to-device communication links (e.g., current communication links, historical communication links, available communication links, and so forth) between the user equipment. The base station may generate and/or receive a path for transmission of the data to the target user equipment. The base station may first transmit the routing information to one or more active user equipment communicatively coupled to the base station. The routing information may specify one or more active user equipment to receive the data and/or the routing information from the base station. In certain embodiments, the routing information may specify one or more passive user equipment to receive the data and/or the routing information from the one or more active user equipment. Additionally or alternatively, the routing information may specify one or more active user equipment and/or one or more passive user equipment to transmit the data and/or the routing information to the target user equipment. As such, the routing information may specify a path or routing for the data and/or the routing information to take from the application server to the base stations to the user equipment (e.g., active user equipment, passive user equipment, target user equipment). 
     In some embodiments, the routing information may specify a first set of active user equipment to transmit the data and/or the routing information to from a first base station. Additionally or alternatively, the routing information may specify a second set of active user equipment to transmit the data and/or the routing information to from a second base station. As such, the routing information may include a path or routing for the data and/or the routing information from the application server to one or more active user equipment within the group of user equipment via the base stations. In certain embodiments, the routing information may specify a first set of passive user equipment to transmit the data and/or the routing information to from the first set of active user equipment. Additionally or alternatively, the routing information may specify a second set of passive user equipment to transmit the data and/or the routing information to from the second set of active user equipment. The routing information may also specify active user equipment transmit the data and/or the routing information to other active user equipment. The routing information may also specify passive user equipment transmit the data and/or the routing information to other passive user equipment. The routing information may also specify the target user equipment to receive the data and/or the routing information. While the above describes paths or routing for data from an application server to target user equipment, routing information may also be used to specify a path or routing for data from any user equipment to the application server via active user equipment, passive user equipment, base stations, and so forth. Additionally or alternatively, the routing information may be transmitted (e.g., by the base stations, by the user equipment) concurrently with the data, subsequently to transmission of the data, prior to transmission of the data, or any other suitable timing. 
     Active user equipment may be controlled or configured using control channels based on the direct connection to the base station. Passive user equipment may have an indirect connection to the base station and may be accessible via an updated control channel path. Control channels provide configuration data to user equipment for paging the user equipment and scheduling data reception and transmission. Active user equipment may identify that a paging message, a configuration message, and/or control data is intended for passive user equipment. The active user equipment may perform the identification based on an identifier associated with a protocol layer format. 
     A Radio Resource Control (RRC) message may provide configuration data to user equipment. The base station may transmit the RRC message to an active user equipment that in turn transmits the message to a passive user equipment. Responses may be transmitted to the base station via the active user equipment (e.g., in some cases, from passive user equipment). Downlink Control Information (DCI) and Uplink Control Information (UCI) may be utilized to control physical layer operation. 
     Moreover, the user equipment may utilize various criteria for entering and/or leaving a group of user equipment. The criteria may include a network signal quality of the user equipment, a power connection, a battery level of the user equipment, a time window, a geographic area of the user equipment, user equipment capabilities (e.g., communication capabilities, computing and/or processing capabilities, sensing capabilities, and so forth), a device-to-device connection, a trust level between user equipment, and so forth. The network signal quality of the user equipment may be compared to a threshold. When below the threshold, there may be a risk that service is interrupted. If another user equipment or a group of user equipment are in close proximity, the user equipment may attempt to form a group or enter the previously formed group. If a user equipment is connected to an electrical grid (e.g., such that it is not powered via its battery), it may no longer require the benefits of shared resources within a group and may leave the group. Alternatively, when connected to electrical grid, the user equipment may receive additional tasks within the group. Additionally, the criteria may be selected based on user preferences and/or user equipment history. 
     Formation of the group of user equipment may begin with user equipment discovery. The user equipment may receive an input to begin user equipment discovery. Additionally or alternatively, the user equipment may begin discovery based on satisfaction of any number of discovery criteria. For example, the discovery criteria may include a power connection, a battery level of the user equipment, a signal strength (e.g., Received Signal Strength Indicator, signal to noise ratio (SNR), or other signal characteristics) associated with the wireless communication network, a time window, a geographic area of the user equipment, and so forth. User equipment may discover other nearby user equipment using wired communications, such as power-line communication (PLC), such as a broadband over power lines (BPL) communication, and/or wireless communications, such as personal area network (PAN), such as an ultra-wideband (UWB) or a BLUETOOTH® network, a local area network (LAN) or wireless local area network (WLAN), and/or a wide area network (WAN). User equipment may be permitted to search for and join a group of user equipment during a particular time window. Additionally, the user equipment may search for and enter a group of user equipment when within a particular geographic area or in proximity or range of a set of user equipment, such as a home or an office. Alternatively, the user equipment may leave a group when leaving the particular geographic area or the proximity or range of the set of user equipment. User equipment that lacks radio technology or does not support particular frequencies may search for and enter a group of user equipment with different and/or greater user equipment capabilities. Additionally, the user equipment may determine whether the user equipment capabilities permit the user equipment to communicate with other user equipment in the group. The user equipment may determine whether a stable device-to-device connection is available with one or more user equipment in the group based on the Received Signal Strength Indicator (RSSI) and signal to noise ratio (SNR), or other signal characteristics. User equipment trust may be established based on previously entering the group of user equipment. 
     User equipment may save power by causing a cellular modem or transceiver to enter a power saving state, such that the cellular modem does not send or receive signals. When it is time to send or receive signals, the user equipment may activate or wake the cellular modem up to enter an operational state. However, there may be complications in waking up the modem to receive signals when the modem is in the power saving state. 
     User equipment may continuously or periodically activate a receiver (e.g., a receiver of a cellular modem) to ensure that wireless (e.g., cellular) signals are received. However, this continuous or periodic activation of the receiver may consume excessive power. Instead, the user equipment may include a wake-up or low power receiver that may consume less power than the cellular receiver as it is lower in complexity (e.g., may not demodulate a received signal, may not amplify a received signal, may not filter a received signal, or so on). If the user equipment is not actively receiving a wireless signal, or not receiving a wireless signal for a threshold period of time, the user equipment may cause the receiver to enter a sleep or power-saving mode, or be deactivated (e.g., powered off), and activate the wake-up signal receiver. The wake-up signal receiver may then periodically scan for a wireless wake-up signal sent from a wireless (e.g., cellular) network. 
     Upon receiving the wake-up signal, the wake-up signal receiver may activate or wake up the cellular receiver, which may begin receiving wireless signals (e.g., cellular signals having user data). The wake-up signal receiver may then enter a sleep or power-saving mode, or be deactivated. However, embedding the wake-up signal in a cellular signal (e.g., having a frequency between 700 megahertz (MHz) and 71 gigahertz (GHz)) may include several drawbacks, such as causing interference with the cellular signal and/or other cellular signals and/or reducing overall spectrum efficiency of a cell or base stations. That is, an increase in traffic of the cell may negatively impact coordination between the wake-up signal receiver and the cell. 
     The wake-up signals may have low frequencies (e.g., 1 gigahertz or less, 800 megahertz (MHz) or less, within a range of 500 MHz to 680 MHz, and so on), such as by using a television whitespace spectrum. In some embodiments, the cellular network may determine that the user equipment should enter the sleep mode (e.g., due to inactivity of the cellular receiver), and the network (e.g., via a Next Generation NodeB (gNodeB or gNB) base station) may request resources for the user equipment and activate the wake-up signal receiver of the user equipment. In additional or alternative embodiments, when the cellular receiver of the user equipment enters an idle state (e.g., an RRC Idle or Inactive state), the cellular network (e.g., via the gNodeB base station) may request resources for the user equipment and activate the wake-up signal receiver of the user equipment. 
     In the event that that the network has data to send to the user equipment, a threshold time has expired, and so on, the network may request a wake-up signal, which broadcasts the wake-up signal that may be received by the user equipment Similarly, if the user equipment has data (e.g., user data) to transmit to the network, the user equipment may acquire a cell supported by a base station of the network. In this manner, the user equipment may cause its cellular receiver to enter a power-saving mode and activate its wake-up signal receiver when it is not actively receiving data, ensuring that the wake-up signal receiver activates its cellular receiver when there is data to send or receive, while saving power. 
     Entering a group of user equipment may begin with group discovery. One or more user equipment within the group may transmit reference signals on a local communications frequency. The reference signals may include the specialized wake-up signals that reduce power consumption. The user equipment may transmit and/or receive the wake-up signals via a device-to-device connection. Additionally or alternatively, the reference signals may include a first reference signal that includes a specialized wake-up signal and a second reference signal that includes additional information. The user equipment may transmit the second reference signal based on an acknowledgement from another user equipment of the first reference signal. The user equipment may select one or more reference signals based on various transmission criteria. For example, the transmission criteria may include a power connection, a battery level of the user equipment, a time window, a geographic area of the user equipment, user equipment capabilities (e.g., communication capabilities, computing and/or processing capabilities, sensing capabilities, and so forth), and so forth. 
     User equipment outside the group may periodically search for and attempt to detect the reference signals. Additionally or alternatively, any number of user equipment may receive a synchronization signal from one or more base stations via the wireless communication network. The user equipment may receive the synchronization signal and may scan for reference signals and/or transmit reference signals. The user equipment may measure the reference signals and join the group. The next step of entering the group includes establishing device-to-device connections. The device-to-device connection may be direct or through a local network connection. The user equipment may also exchange user equipment capabilities. The user equipment capabilities may be utilized to determine preferred communication frequencies, the types of communication technologies of the group and the new user equipment, a current battery status of the user equipment, a current thermal status of the user equipment, and so forth. Each user equipment may periodically send a keep alive message to at least one primary user equipment and/or active user equipment in the group. Additionally, the user equipment may send an exit message to at least one primary user equipment and/or active user equipment in the group. For example, the user equipment may send the exit message based on failing to satisfy any number of group criteria, such as a signal strength associated with a device-to-device connection to at least one primary user equipment and/or active user equipment. 
     To maintain the group, the number of active user equipment and/or the number of passive user equipment may be controlled (e.g., by the primary user equipment). For example, if an active user equipment leaves coverage of a base station, the active user equipment may be reassigned as a passive user equipment. A primary user equipment may fall below a battery threshold and a new primary user equipment may be assigned. The primary user equipment may receive regular updates from other user equipment in the group regarding battery status, thermal status, and link status of the user equipment. Additionally, the primary user equipment may maintain a list of candidates from the active user equipment to be assigned as a new primary user equipment. The primary user equipment may send a request to one of the candidates to become a new primary user equipment. Additionally, the primary user equipment may determine elapsed times from receiving keep alive messages and/or from receiving data from any of the user equipment within the group. The primary user equipment may compare the elapsed times to a threshold time duration and may transmit an exit message based on one or more of the elapsed times exceeding the threshold time duration. The primary user equipment may remove a device identifier associated with the user equipment based on the elapsed time. Additionally, the user equipment may determine elapsed times from receiving keep alive messages and/or from receiving data from at least one primary user equipment and/or active user equipment. The user equipment may compare the elapsed times to a second threshold time duration and may transmit an exit message based on one or more of the elapsed times. 
     The group of user equipment may cooperate to communicate with the wireless communication network. The user equipment may receive synchronization signals to facilitate communication with the wireless communication network. The user equipment may be synchronized in one or more of time, frequency, and/or phase. The synchronization signal may include timing information that assists the user equipment in transmission and/or reception of data via the wireless communication network. The synchronization signal may also include frequency information that reduces phase drift. The synchronization signal may also include phase information that provides coherent (e.g., in-phase) signal transmission to the wireless communication network. Additionally, the primary user equipment may transmit a selected time, a selected frequency, and/or a selected phase to other user equipment in the group. The primary user equipment may also select one or more of a carrier frequency, a bandwidth, a sub-carrier spacing, and so forth associated with the wireless communication network. 
     One or more base stations may transmit the synchronization signals to any number of user equipment. The user equipment may also receive synchronization signals from a source external from the wireless communication network, such as a global navigation satellite system (GNSS) signal. Alternatively, any user equipment may transmit synchronization signals to other user equipment within the group. The user equipment may receive the synchronization signals and may determine timing synchronization and/or frequency synchronization based on the synchronization signals. The primary user equipment may select a bandwidth associated with the synchronization signals. Additionally, the primary user equipment may select a transmission duration associated with the synchronization signals based on the frequency. The primary user equipment may also select a periodicity associated with the synchronization signals. 
     Each user equipment may transmit sounding reference signals to one or more base stations via the wireless communication network. The base stations may receive the sounding reference signals and may determine phase relationships (e.g., phase differences) between the user equipment. Additionally, the base stations may determine and/or may select a set of phases that provides optimized signal strength for communications between the group of user equipment and the wireless communication network. The base stations may transmit the set of phases to any number of user equipment, such as the primary user equipment. The primary user equipment may transmit the set of phases to other user equipment within the group. 
     Establishing communication with the wireless communication network may begin with receiving system synchronization signals, such as a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and so forth. The user equipment may receive the synchronization signals and may determine radio frame boundaries based on the synchronization signals. The user equipment may also receive system information transmitted via one or more base stations of the wireless communication network. The primary user equipment may transmit user equipment capabilities associated with the primary user equipment to one or more active user equipment. The user equipment capabilities may include communication capabilities, computing and/or processing capabilities, sensing capabilities, radio frequency bands, carrier frequencies, cell identifiers, radio access technologies, and so forth associated with the primary user equipment. The active user equipment may receive the synchronization signals and/or the system information from the wireless communication network based on the user equipment capabilities associated with the primary user equipment. The active user equipment may receive a portion of the synchronization signals and/or a portion of the system information. The primary user equipment may receive these portions from the active user equipment and may assemble these portions to form the synchronization signals and/or the system information. 
     The primary equipment may select a set of communication parameters, such as a frequency, a time, a cell identifier, and so forth, for communication with the wireless communication network based on the synchronization signals and/or the system information. The primary equipment may transmit the set of communication parameters to the active user equipment within the group. The primary user equipment may transmit a random access signal to the active user equipment within the group. The primary user equipment may also instruct the active user equipment to transmit the random access signal based on the set of communication parameters. The primary user equipment may also transmit the random access signal based on the set of communication parameters. One or more base stations may receive the random access signal and may transmit an acknowledgement message to the primary user equipment and/or the active user equipment. The primary user equipment may retransmit the random access signal if the acknowledgement message is not received within a threshold time duration. The primary user equipment may also instruct the active user equipment to retransmit the random access signal. The group of user equipment may retransmit the random access signal with various relative phases. The group of user equipment may periodically retransmit the random access signal until the acknowledgement message is received. Alternatively, the group of user equipment may retransmit the random access signal until a threshold number of transmissions is reached. Additionally, each user equipment may adjust a transmission power associated with the random access signal for subsequent transmissions. The random access signal may include an orthogonal signal. 
     The base stations may transmit the acknowledgement message to the group of user equipment. The acknowledgement message may include communication information associated with the wireless communication network. The base station may transmit an indication of the acknowledgement message on a downlink control channel. The base station may also transmit information associated with downlink shared channel. The user equipment may monitor the downlink control channel and may receive control channel information from the base stations via the downlink control channel. The active user equipment may transmit control channel signals to the primary user equipment that aggregates and/or assembles the control channel signals for processing and decoding control channel information. The active user equipment may receive and/or decode the control channel information and may transmit the control channel information to the primary user equipment. The control channel information may include downlink control information that identifies information associated with a transmission (e.g., the acknowledgement message) on the downlink shared channel. The user equipment may utilize the information to receive the acknowledgement message via the downlink shared channel. Additionally, the user equipment may receive access message information associated with transmission of an access message to the base stations. 
     The primary user equipment may receive the access message information and may determine communication parameters (e.g., time, frequency, temporary identifier, timing adjustment, and so forth) associated with transmission of the access message. The primary user equipment may transmit the communication parameters to the active user equipment. The primary user equipment may instruct the active user equipment to transmit the access message based on the communication parameters. The user equipment may transmit the access message via an uplink shared channel. The user equipment may transmit the access message using a space time block code (STBC) or orthogonal signal. Each user equipment may transmit a row of a STBC via an antenna. Additionally or alternatively, the primary user equipment may transmit a set of phases to the active user equipment. Each phase may be associated with a corresponding active user equipment. The active user equipment may transmit the access message based on the set of phases. 
     The base stations may receive the access message from one or more active user equipment. The base station may transmit a transition message in response to the access message. The transition message may cause the user equipment to adjust an operational mode to a connected mode. In the connected mode, the user equipment may communicate with the base stations via the downlink control channel, downlink shared channel, uplink control channel, and uplink shared channel. The user equipment may utilize multiple-input and multiple-output (MIMO) techniques for data communication with the wireless communication network. On the downlink channels, the active user equipment within the group may receive MIMO orthogonal frequency-division multiplexing (MIMO-OFDM) signals and/or time domain samples and may transmit the same to the primary user equipment. The primary user equipment may demodulate the MIMO-OFDM signals. On the uplink channels, active user equipment within the group identify multiple sounding reference signal phase combinations for transmission of MIMO signals. 
     The user equipment may receive reconfiguration messages that reconfigure the user equipment to allow local communication between the user equipment. The reconfiguration messages may include an additional delay for a user equipment within the group of user equipment to allow for local communication. That is, user equipment that join the group may be reconfigured to include the additional delay. 
       FIG.  1    is a block diagram of user equipment  10  (e.g., a mobile electronic device), according to embodiments of the present disclosure. The user equipment  10  may include, among other things, one or more processors  12  (collectively referred to herein as a single processor for convenience, which may be implemented in any suitable form of processing circuitry), memory  14 , nonvolatile storage  16 , a display  18 , input structures  22 , an input/output (I/O) interface  24 , a network interface  26 , and a power source  29 . The various functional blocks shown in  FIG.  1    may include hardware elements (including circuitry), software elements (including machine-executable instructions) or a combination of both hardware and software elements (which may be referred to as logic). The processor  12 , memory  14 , the nonvolatile storage  16 , the display  18 , the input structures  22 , the input/output (I/O) interface  24 , the network interface  26 , and/or the power source  29  may each be communicatively coupled directly or indirectly (e.g., through or via another component, a communication bus, a network) to one another to transmit and/or receive data between one another. It should be noted that  FIG.  1    is merely one example of a particular implementation and is intended to illustrate the types of components that may be present in the user equipment  10 . 
     By way of example, the user equipment  10  may include any suitable computing device, including a desktop or notebook computer (e.g., in the form of a MacBook®, MacBook® Pro, MacBook Air®, iMac®, Mac® mini, or Mac Pro® available from Apple Inc. of Cupertino, Calif.), a portable electronic or handheld electronic device such as a wireless electronic device or smartphone (e.g., in the form of a model of an iPhone® available from Apple Inc. of Cupertino, Calif.), a tablet (e.g., in the form of a model of an iPad® available from Apple Inc. of Cupertino, Calif.), a wearable electronic device (e.g., in the form of an Apple Watch® by Apple Inc. of Cupertino, Calif.), and other similar devices. It should be noted that the processor  12  and other related items in  FIG.  1    may be embodied wholly or in part as software, hardware, or both. Furthermore, the processor  12  and other related items in  FIG.  1    may be a single contained processing module or may be incorporated wholly or partially within any of the other elements within the user equipment  10 . The processor  12  may be implemented with any combination of general-purpose microprocessors, microcontrollers, digital signal processors (DSPs), field programmable gate array (FPGAs), programmable logic devices (PLDs), controllers, state machines, gated logic, discrete hardware components, dedicated hardware finite state machines, or any other suitable entities that may perform calculations or other manipulations of information. The processors  12  may include one or more application processors, one or more baseband processors, or both, and perform the various functions described herein. 
     In the user equipment  10  of  FIG.  1   , the processor  12  may be operably coupled with a memory  14  and a nonvolatile storage  16  to perform various algorithms. Such programs or instructions executed by the processor  12  may be stored in any suitable article of manufacture that includes one or more tangible, computer-readable media. The tangible, computer-readable media may include the memory  14  and/or the nonvolatile storage  16 , individually or collectively, to store the instructions or routines. The memory  14  and the nonvolatile storage  16  may include any suitable articles of manufacture for storing data and executable instructions, such as random-access memory, read-only memory, rewritable flash memory, hard drives, and optical discs. In addition, programs (e.g., an operating system) encoded on such a computer program product may also include instructions that may be executed by the processor  12  to enable the user equipment  10  to provide various functionalities. 
     In certain embodiments, the display  18  may facilitate users to view images generated on the user equipment  10 . In some embodiments, the display  18  may include a touch screen, which may facilitate user interaction with a user interface of the user equipment  10 . Furthermore, it should be appreciated that, in some embodiments, the display  18  may include one or more liquid crystal displays (LCDs), light-emitting diode (LED) displays, organic light-emitting diode (OLED) displays, active-matrix organic light-emitting diode (AMOLED) displays, or some combination of these and/or other display technologies. 
     The input structures  22  of the user equipment  10  may enable a user to interact with the user equipment  10  (e.g., pressing a button to increase or decrease a volume level). The I/O interface  24  may enable user equipment  10  to interface with various other electronic devices, as may the network interface  26 . In some embodiments, the I/O interface  24  may include an I/O port for a hardwired connection for charging and/or content manipulation using a standard connector and protocol, such as the Lightning connector provided by Apple Inc. of Cupertino, Calif., a universal serial bus (USB), or other similar connector and protocol. The network interface  26  may include, for example, one or more interfaces for a personal area network (PAN), such as an ultra-wideband (UWB) or a BLUETOOTH® network, a local area network (LAN) or wireless local area network (WLAN), such as a network employing one of the IEEE  802 . 11 x family of protocols (e.g., WI-FI®), and/or a wide area network (WAN), such as any standards related to the Third Generation Partnership Project (3GPP), including, for example, a 3 rd  generation (3G) cellular network, universal mobile telecommunication system (UMTS), 4 th  generation (4G) cellular network, long term evolution (LTE®) cellular network, long term evolution license assisted access (LTE-LAA) cellular network, 5 th  generation (5G) cellular network, and/or New Radio (NR) cellular network, a 6 th  generation (6G) or greater than 6G cellular network, a satellite network, a non-terrestrial network, and so on. In particular, the network interface  26  may include, for example, one or more interfaces for using a Release- 15  cellular communication standard of the 5G specifications that include the millimeter wave (mmWave) frequency range (e.g., 24.25-300 gigahertz (GHz)) and/or any other cellular communication standard release (e.g., Release-16, Release-17, any future releases) that define and/or enable frequency ranges used for wireless communication. The network interface  26  of the user equipment  10  may allow communication over the aforementioned networks (e.g., 5G, Wi-Fi, LTE-LAA, and so forth). 
     The network interface  26  may also include one or more interfaces for, for example, broadband fixed wireless access networks (e.g., WIMAX®), mobile broadband Wireless networks (mobile WIMAX®), asynchronous digital subscriber lines (e.g., ADSL, VDSL), digital video broadcasting-terrestrial (DVB-T®) network and its extension DVB Handheld (DVB-H®) network, ultra-wideband (UWB) network, alternating current (AC) power lines, and so forth. 
       FIG.  2    is a functional diagram of the user equipment  10  of  FIG.  1   , according to embodiments of the present disclosure. As illustrated, the processor  12 , the memory  14 , the transceiver  30 , a transmitter  52 , a receiver  54 , and/or antennas  55  (illustrated as  55 A- 55 N, collectively referred to as an antenna  55 ) may be communicatively coupled directly or indirectly (e.g., through or via another component, a communication bus, a network) to one another to transmit and/or receive data between one another. 
     The user equipment  10  may include the transmitter  52  and/or the receiver  54  that respectively enable transmission and reception of data between the user equipment  10  and an external device via, for example, a network (e.g., including base stations or access points) or a direct connection. As illustrated, the transmitter  52  and the receiver  54  may be combined into the transceiver  30 . The user equipment  10  may also have one or more antennas  55 A- 55 N electrically coupled to the transceiver  30 . The antennas  55 A- 55 N may be configured in an omnidirectional or directional configuration, in a single-beam, dual-beam, or multi-beam arrangement, and so on. Each antenna  55  may be associated with a one or more beams and various configurations. In some embodiments, multiple antennas of the antennas  55 A- 55 N of an antenna group or module may be communicatively coupled a respective transceiver  30  and each emit radio frequency signals that may constructively and/or destructively combine to form a beam. The user equipment  10  may include multiple transmitters, multiple receivers, multiple transceivers, and/or multiple antennas as suitable for various communication standards. In some embodiments, the transmitter  52  and the receiver  54  may transmit and receive information via other wired or wireline systems or means. 
     The user equipment  10  may include the wake-up or low power receiver that, in operation, consumes less power than the receiver  54  as it is lower in complexity (e.g., may not demodulate a received signal, may not amplify a received signal, may not filter a received signal, or so on). That is, the wake-up WUS receiver may include fewer or less complex components than the receiver  54 , such that, in operation, it uses less power than the receiver  54 . For example, the wake-up signal receiver may not include a demodulator, an amplifier, a filter, or the like, where the receiver  54  does include such a component. Moreover, the various components of the user equipment  10  may be coupled together by a bus system  58 . The bus system  58  may include a data bus, for example, as well as a power bus, a control signal bus, and a status signal bus, in addition to the data bus. The components of the user equipment  10  may be coupled together or accept or provide inputs to each other using some other mechanism. 
     Moreover, the various components of the user equipment  10  may be coupled together by a bus system  56 . The bus system  56  may include a data bus, for example, as well as a power bus, a control signal bus, and a status signal bus, in addition to the data bus. The components of the user equipment  10  may be coupled together or accept or provide inputs to each other using some other mechanism. 
       FIG.  3    is a schematic diagram of a communication system  100  including the user equipment  10  of  FIG.  1    communicatively coupled to a wireless communication network  102  supported by base stations  104 A,  104 B (collectively  104 ), according to embodiments of the present disclosure. In particular, the base stations  104  may include Next Generation NodeB (gNodeB or gNB) base stations and may provide 5G/NR coverage via the wireless communication network  102  to the user equipment  10 . The base stations  104  may include any suitable electronic device, such as an access point, a communication hub or node, and so on, that facilitates, supports, and/or implements the network  102 . In some embodiments, the base stations  104  may include Evolved NodeB (eNodeB) base stations and may provide 4G/LTE coverage via the wireless communication network  102  to the user equipment  10 . Each of the base stations  104  may include at least some of the components of the user equipment  10  shown in  FIGS.  1  and  2   , including one or more processors  12 , the memory  14 , the storage  16 , the transceiver  30 , the transmitter  52 , and the receiver  54 . It should be understood that while the present disclosure may use 5G/NR as an example specification or standard, the embodiments disclosed herein may apply to other suitable specifications or standards (e.g., such as the 4G/LTE specification, a personal area network (PAN), a local area network (LAN), wireless local area network (WLAN) such as Wi-Fi, a metropolitan area network (MAN), a wide area network (WAN), and so on). Moreover, the network  102  may include any suitable number of base stations  104  (e.g., one or more base stations  104 , four or more base stations  104 , ten or more base stations  104 , and so on). Additionally or alternatively, the base stations  104  may include any number of user equipment  10  that communicatively couple to the wireless communication network  102 . 
       FIG.  4    is a schematic diagram of a communication system  200  including the base stations  104  (e.g., base stations  104 A,  104 B,  104 C), an application server  202 , and a group of user equipment  206 . The application server  202  may include any suitable electronic device (e.g., a desktop personal computer, a laptop, a mobile electronic device, a tablet, a smartphone, a wearable device, or any other suitable computing device) and may include at least some of the components of the user equipment  10  shown in  FIGS.  1  and  2   , including one or more processors  12 , the memory  14 , the storage  16 , the transceiver  30 , the transmitter  52 , and the receiver  54 . The communication system  200  may include any suitable number of application servers  202  (e.g., one or more application servers  202 , four or more application servers  202 , and so on). The base stations  104  may provide access for the group of user equipment  206  to transfer data and/or control information to and from the application server  202 . In certain embodiments, a first base station  104 A may be associated with a different carrier or operator from a second base station  104 B. Additionally or alternatively, one or more of the base stations  104  may operate using the same carrier. The group of user equipment  206  may cooperate for transferring data and/or control information. The group of user equipment  206  may include any number of active user equipment  208 A,  208 B,  208 C (referred to collectively as active user equipment  208 ) and/or any number of passive user equipment  210 A,  210 B (referred to collectively as passive user equipment  210 ). Each user equipment (e.g., active user equipment  208 , passive user equipment  210 ) may include any suitable electronic device and may be an example of the user equipment  10  shown in  FIGS.  1  and  2   . As such, each of the user equipment may include at least some of the components of the user equipment  10 , such as one or more processors  12 , the memory  14 , the storage  16 , the transceiver  30 , the transmitter  52 , and the receiver  54 . Additionally, the group of user equipment  206  may include any suitable number of user equipment (e.g., any suitable number of active user equipment  208 , any suitable number of passive user equipment  210 ). 
     Each of the active user equipment  208  may be communicatively coupled to the wireless communication network  102  (e.g., via at least one of the base stations  104 ). Additionally or alternatively, the active user equipment  208  may be communicatively coupled to other active user equipment  208  and/or at least one passive user equipment  210 . For example, the active user equipment  208  may be communicatively coupled via any suitable communication technique, such as a device-to-device communication link, sidelink communication, peer-to-peer communication, and so forth. In certain embodiments, the active user equipment  208 A may serve as a relay for at least one active user equipment  208  and/or at least one passive user equipment  210 . For example, the active user equipment  208 A may transfer data and/or control information received from one user equipment (e.g., active user equipment  208 B, passive user equipment  210 A) in the group  206  to another user equipment (e.g., active user equipment  208 C, passive user equipment  210 B) in the group  206 . 
     In certain embodiments, any suitable number of active UE  208  may be communicatively coupled with any number of base stations  104 . A target UE (e.g., first active UE  208 A, first passive UE  210 B) may request data from the wireless communication network  102 . The group of UE  206  may coordinate and cooperate to transmit the request to the wireless communication network  102 . Each active UE  208  may receive the data  204  and/or one or more sets  204 A,  204 B (e.g., a portion, a subset) of the data from the wireless communication network  102  via base stations  104 . The active UEs  208  may transfer the sets of data to other active UEs  208  within the group of user equipment  206 . The active UEs  208  may assemble the data based at least in part on the received sets of the data. The group of user equipment  206  may coordinate and cooperate to provide the data to the target UE. Accordingly, the target UE may receive the data and/or the data sets and may assemble the data based on the data sets. 
     With the foregoing in mind,  FIG.  5    is a flowchart of a method  300  to synchronize the group of user equipment  206  of  FIG.  4    using the wireless communication network  102 , according to embodiments of the present disclosure. Any suitable device (e.g., a controller) that may control components of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , such as one or more respective processors  12  of these devices, may perform the method  300 . In some embodiments, the method  300  may be implemented by executing instructions stored in a tangible, non-transitory, computer-readable medium, such as the one or more respective memories  14  or storages  16  of these devices, using the processors  12 . For example, the method  300  may be performed at least in part by one or more software components, such as one or more respective operating systems of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , one or more software applications of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210  and the like. While the method  300  is described using steps in a specific sequence, it should be understood that the present disclosure contemplates that the described steps may be performed in different sequences than the sequence illustrated, and certain described steps may be skipped or not performed altogether. 
     In process block  302 , the network  102  and/or the application server  202  broadcasts or transmits one or more synchronization signals to the base stations  104 . The base stations  104  may receive the one or more synchronization signals and may transmit (block  304 ) the one or more synchronization signals to active UE  208 A and active UE  208 B. Alternatively, the base stations  104  may generate the one or more synchronization signals. The first active UE  208 A may receive (block  306 ) the one or more synchronization signals from the base stations  104 . The first active UE  208 A may transmit (block  308 ) a reference signal based on the one or more synchronization signals. In certain embodiments, the first active UE  208 A may generate and/or may transmit the reference signal in response to receiving the synchronization signal. As such, the synchronization signal may cause the first active UE  208 A to transmit the reference signal. 
     A second active UE  208 B may receive (block  310 ) one or more synchronization signals. After receiving the one or more synchronization signals, the second active UE  208 B may scan (block  312 ) for one or more reference signals based on the one or more synchronization signals. For example, the synchronization signal may cause the second active UE  208 B to scan for the reference signal. The second active UE  208 B may receive (block  314 ) the reference signal. The second active UE  208 B may measure the reference signal. The second active UE  208 B may establish (block  316 ) a device-to-device communication link with the first active UE  208 A based on the reference signal. 
     With the foregoing in mind,  FIG.  6    is a flowchart of a method  400  to forming the group of user equipment  206  of  FIG.  4   , according to embodiments of the present disclosure. Any suitable device (e.g., a controller) that may control components of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , such as one or more respective processors  12  of these devices, may perform the method  400 . In some embodiments, the method  400  may be implemented by executing instructions stored in a tangible, non-transitory, computer-readable medium, such as the one or more respective memories  14  or storages  16  of these devices, using the processors  12 . For example, the method  400  may be performed at least in part by one or more software components, such as one or more respective operating systems of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , one or more software applications of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210  and the like. While the method  400  is described using steps in a specific sequence, it should be understood that the present disclosure contemplates that the described steps may be performed in different sequences than the sequence illustrated, and certain described steps may be skipped or not performed altogether. 
     In process block  402 , the active UE  208  may receive a request for group formation. For example, the active UE  208  may receive an input indicative of the request to form the group of UE  206 . The input structures  22  may receive the input and may transmit a signal indicative of the input to the processor  12 . The active UE  208  may receive (block  404 ) a set of UE attributes associated with the active UE  208 . The active UE  208  may utilize the set of UE attributes to determine preferred communication frequencies, the types of communication technologies associated with the active UE  208 , a current battery status of the active UE  208 , a current thermal status of the active UE  208 , and so forth. The set of UE attributes may include a power connection, a battery level of the active UE  208 , a signal characteristic such as a signal strength (e.g., Received Signal Strength Indicator) or signal quality (e.g., signal to noise ratio (SNR)) associated with the wireless communication network  102 , a time window, a geographic area of the active UE  208 , and so forth. The active UE  208  may receive (block  406 ) a set of connection criteria. The set of connection criteria may include any number of thresholds associated with corresponding UE attributes. For example, the network signal quality of the active UE  208  may be compared to a threshold. When below the threshold, there may be a risk that service is interrupted. If another UE  10  or a group of UE  206  are in close proximity, the active UE  208  may attempt to form a group or enter the previously formed group of UE  206 . Additionally, the criteria may be selected based on user preferences and/or user equipment history. The active UE  208  may determine whether a stable device-to-device connection is available with one or more user equipment  10  in the group of UE  206  based on the Received Signal Strength Indicator (RSSI) and signal to noise ratio (SNR), or other signal characteristics. User equipment trust may be established based on previously entering the group of user equipment  206 . 
     The active UE  208  may determine (block  408 ) whether the set of UE attributes satisfy at least one criteria of the set of the connection criteria. If the active UE  208  is connected to an electrical grid (e.g., such that it is not powered via its battery), it may not require the benefits of shared resources within the group of UE  206  and may not join the group of UE  206 . Alternatively, when connected to the electrical grid, the active UE  206  may join the group of UE  206  to receive additional tasks. The active UE  208  may be permitted to search for and join the group of UE  206  during a particular time window. Additionally, the active UE  208  may search for and enter the group of UE  206  when within a particular geographic area or in proximity or range of a set of UE  10 , such as a home or an office. The active UE  208  may lack radio technology or does not support particular frequencies. As such, the active UE  208  may search for and enter the group of UE  206  with different and/or greater UE attributes. Additionally, the active UE  208  may determine whether the UE attributes permit the active UE  208  to communicate with other user equipment in the group of UE  206 . In response to failing to satisfy at least one criteria of the set of connection criteria (NO path of block  408 ), the active UE  208  may return to receive (block  402 ) a subsequent request for group formation. 
     Based on satisfaction of at least one criteria of the set of connection criteria (YES path of block  408 ), the active UE  208  may receive (block  410 ) one or more synchronization signals. For example, the active UE  208  may scan for the synchronization signals based on satisfying the at least one criteria. The active UE  208  may receive the synchronization signals via the base stations  104 . At block  412 , the active UE  208  may transmit a reference signal based on the one or more synchronization signals. The active UE  208  may transmit reference signals on a local communications frequency. The reference signals may include specialized wake-up signals that reduce power consumption. Additionally or alternatively, the reference signals may include a first reference signal that includes a specialized wake-up signal and a second reference signal that includes additional information. The active UE  208  may transmit the second reference signal based on an acknowledgement from another UE  10  of the first reference signal. In certain embodiments, the active UE  208  may select one or more reference signals based on various transmission criteria. For example, the transmission criteria may include a power connection, a battery level of the user equipment, a time window, a geographic area of the user equipment, user equipment capabilities (e.g., communication capabilities, computing and/or processing capabilities, sensing capabilities, and so forth), and so forth. The active UE  208  may establish (block  414 ) a device-to-device communication link with another UE  10 . For example, the active UE  208  may receive an acknowledgment message from the UE  10  based on receiving the reference signals. The active UE  208  may establish the device-to-device communication link in response to receiving the acknowledgment message from the UE  10 . 
     With the foregoing in mind,  FIG.  7    is a flowchart of a method  500  to adjust membership of the group of user equipment  206  of  FIG.  4   , according to embodiments of the present disclosure. Any suitable device (e.g., a controller) that may control components of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , such as one or more respective processors  12  of these devices, may perform the method  500 . In some embodiments, the method  500  may be implemented by executing instructions stored in a tangible, non-transitory, computer-readable medium, such as the one or more respective memories  14  or storages  16  of these devices, using the processors  12 . For example, the method  500  may be performed at least in part by one or more software components, such as one or more respective operating systems of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , one or more software applications of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210  and the like. While the method  500  is described using steps in a specific sequence, it should be understood that the present disclosure contemplates that the described steps may be performed in different sequences than the sequence illustrated, and certain described steps may be skipped or not performed altogether. 
     The UE  10  may receive (block  502 ) a set of UE attributes associated with the UE  10 . The set of UE attributes may include an elapsed time from a previous keep-alive message, an elapsed time from receiving a task from a primary UE, and the like. The UE  10  may also receive (block  504 ) a set of connection criteria associated with the group of UE  206 . In response to failing to satisfy at least one criteria of the set of connection criteria (NO path of block  506 ), the UE  10  may transmit (block  508 ) an exit message. The UE  10  may compare the elapsed times to a threshold time duration and may transmit the exit message based on one or more of the elapsed times exceeding the threshold time duration. As such, the UE  10  may terminate (block  510 ) one or more device-to-device communication links with other UE  10  in the group of UE  206 . 
     Based on satisfaction of at least one criteria of the set of connection criteria (YES path of block  506 ), the UE  10  may transmit (block  512 ) a keep-alive message. The UE  10  may periodically send a keep alive message to at least one primary user equipment and/or active user equipment in the group of UE  206 . As such, the primary UE may maintain membership of the UE  10  within the group of UE  206 . Additionally or alternatively, the primary UE may transmit one or more keep-alive messages to UE  10  within the group of UE  206 . The primary UE may maintain membership of the UE  10  that transmit an acknowledgment of the keep-alive message. Additionally, the primary UE may terminate one or more device-to-device communication links if no acknowledgment message is received from one or more UE  10  within the group of UE  206 . The primary UE may also transmit an exit message to one or more UE  10 . 
     With the foregoing in mind,  FIG.  8    is a flowchart of a method  600  to synchronize the group of user equipment  206  using synchronization signals from the wireless communication network  102 , according to embodiments of the present disclosure. Any suitable device (e.g., a controller) that may control components of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , such as one or more respective processors  12  of these devices, may perform the method  600 . In some embodiments, the method  600  may be implemented by executing instructions stored in a tangible, non-transitory, computer-readable medium, such as the one or more respective memories  14  or storages  16  of these devices, using the processors  12 . For example, the method  600  may be performed at least in part by one or more software components, such as one or more respective operating systems of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , one or more software applications of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210  and the like. While the method  600  is described using steps in a specific sequence, it should be understood that the present disclosure contemplates that the described steps may be performed in different sequences than the sequence illustrated, and certain described steps may be skipped or not performed altogether. 
     One or more base stations may transmit (block  602 ) one or more synchronization signals to active UEs  208 A and  208 B. For example, the base stations  104  may generate the synchronization signals. The synchronization signals may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and so forth. The synchronization signals may include timing information that assists the user equipment in transmission and/or reception of data via the wireless communication network. The synchronization signals may also include frequency information that reduces phase drift. The synchronization signals may also include phase information that provides coherent (e.g., in-phase) signal transmission to the wireless communication network. At block  604 , the first active UE  208 A may receive the one or more synchronization signals. The first active UE  208 A may also determine (block  606 ) a first set of synchronization attributes based on the one or more synchronization signals. The synchronization attributes may include a time, a frequency, a phase, a carrier frequency, a bandwidth, a sub-carrier spacing, and so forth based on the one or more synchronization signals, the timing information, the frequency information, and the phase information. At block  608 , the second active UE  208 B may receive (block  608 ) the one or more synchronization signals. The second active UE  208 B may also determine (block  610 ) a second set of synchronization attributes based on the one or more synchronization signals. 
     The second active UE  208 B may transmit (block  612 ) the second set of synchronization attributes to the first active UE  208 A. The first active UE  208 A may receive (block  614 ) the second set of synchronization attributes from the second active UE  208 B. The first active UE  208 A may determine (block  616 ) whether the first set of synchronization attributes correlates with the second set of synchronization attributes. In certain embodiments, the first active UE  208 A may determine one or more of the first set of synchronization attributes are within threshold values of the second set of synchronization attributes. For example, the first active UE  208 A may determine a first frequency is within a threshold frequency value of a second frequency. If the first set of synchronization attributes does not correlate with the second set of synchronization attributes (NO path of block  616 ), the first active UE  208 A may return to block  604  to receive one or more additional synchronization signals. If the first set of synchronization attributes does correlate with the second set of synchronization attributes (YES path of block  616 ), the first active UE  208 A may establish a connection with the wireless communication network based on the first set of synchronization attributes, the second set of synchronization attributes, or both. 
     The active UEs  208  may also receive synchronization signals from a source external from the wireless communication network, such as a global navigation satellite system (GNSS) signal. Alternatively, the primary UE may transmit synchronization signals to UE  10  within the group of UE  206 . The UE  10  may receive the synchronization signals and may determine timing synchronization and/or frequency synchronization based on the synchronization signals. The primary user equipment may select a bandwidth associated with the synchronization signals. Additionally, the primary user equipment may select a transmission duration associated with the synchronization signals based on the frequency. The primary user equipment may also select a periodicity associated with the synchronization signals 
     With the foregoing in mind,  FIG.  9    is a flowchart of a method  700  for phase synchronization of the group of UE  206 , according to embodiments of the present disclosure. Any suitable device (e.g., a controller) that may control components of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , such as one or more respective processors  12  of these devices, may perform the method  700 . In some embodiments, the method  700  may be implemented by executing instructions stored in a tangible, non-transitory, computer-readable medium, such as the one or more respective memories  14  or storages  16  of these devices, using the processors  12 . For example, the method  700  may be performed at least in part by one or more software components, such as one or more respective operating systems of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , one or more software applications of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210  and the like. While the method  700  is described using steps in a specific sequence, it should be understood that the present disclosure contemplates that the described steps may be performed in different sequences than the sequence illustrated, and certain described steps may be skipped or not performed altogether. 
     At block  702 , the first active UE  208 A may transmit a first set of reference signals to base stations  104 . Each active UE  208  may transmit sounding reference signals to one or more base stations  104  via the wireless communication network  102 . The second active UE  208 B may transmit (block  704 ) a second set of reference signals to the base stations  104 . The base stations  104  may receive (block  706 ) a first set of reference signals from active UEs  208  and a second set of reference signals from passive UEs  210 . The base stations  104  may determine (block  708 ) a set of phases based on the first and second sets of reference signals. The base stations  104  may receive the sets of reference signals and may determine phase relationships (e.g., phase differences) between the UE  10  within the group of UE  206 . The base stations  104  may transmit (block  710 ) the set of phases to active UEs  208 . The first active UE  208 A may receive (block  712 ) the set of phases. The first active UE  208 A may transmit (block  714 ) the set of phases to the second active UE  208 B. The second active UE  208 B may receive (block  716 ) the set of phases. As such, the active UEs  208  may transmit and/or receive data and/or signals using the set of phases. Each active UE  208  may transmit and/or receive data using a corresponding phase of the set of phases. 
     With the foregoing in mind,  FIG.  10    is a flowchart of a method  800  to receive system information associated with the wireless communication network  102 , according to embodiments of the present disclosure. Any suitable device (e.g., a controller) that may control components of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , such as one or more respective processors  12  of these devices, may perform the method  800 . In some embodiments, the method  800  may be implemented by executing instructions stored in a tangible, non-transitory, computer-readable medium, such as the one or more respective memories  14  or storages  16  of these devices, using the processors  12 . For example, the method  800  may be performed at least in part by one or more software components, such as one or more respective operating systems of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , one or more software applications of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210  and the like. While the method  800  is described using steps in a specific sequence, it should be understood that the present disclosure contemplates that the described steps may be performed in different sequences than the sequence illustrated, and certain described steps may be skipped or not performed altogether. 
     At block  802 , the base stations  104  may transmit a radio synchronization signal to active UEs  208 . The radio synchronization signal may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and so forth. The first active UE  208 A may receive (block  804 ) the radio synchronization signal from the base stations  104 . The first active UE  208 A may determine (block  808 ) a set of network attributes based on the radio synchronization signal. The set of network attributes may include radio frame boundaries, a frequency, a timing, a cell identifier, and so forth. The first active UE  208 A may determine (block  810 ) a first set of synchronization attributes based on the radio synchronization signal. At block  812 , the first active UE  208 A may transmit the set of network attributes to the second active UE  208 B. At block  816 , the base stations  104  may transmit system information to active UEs  208 . The first active UE  208 A may receive (block  818 ) system information from base stations  104  based on the set of network attributes. The first active UE  208 A may also transmit the system information to the second active UE  208 B. The second active UE  208 B may receive (block  820 ) system information based on the set of network attributes and may establish a connection with the wireless communication network  102  based on the system information. 
     With the foregoing in mind,  FIG.  11    is a flowchart of a method  900  to receive system information associated with the wireless communication network  102 , according to embodiments of the present disclosure. Any suitable device (e.g., a controller) that may control components of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , such as one or more respective processors  12  of these devices, may perform the method  900 . In some embodiments, the method  900  may be implemented by executing instructions stored in a tangible, non-transitory, computer-readable medium, such as the one or more respective memories  14  or storages  16  of these devices, using the processors  12 . For example, the method  900  may be performed at least in part by one or more software components, such as one or more respective operating systems of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , one or more software applications of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210  and the like. While the method  900  is described using steps in a specific sequence, it should be understood that the present disclosure contemplates that the described steps may be performed in different sequences than the sequence illustrated, and certain described steps may be skipped or not performed altogether. 
     The first active UE  208 A may transmit (block  902 ) transmission attributes to one or more active UE  208 , such as second active UE  208 B. The transmission attributes may include a time associated with transmission to the wireless communication network  102 , a frequency associated with transmission to the wireless communication network  102 , a signature associated with transmission to the wireless communication network  102 , a cell identifier, and so forth. The first active UE  208 A may transmit (block  904 ) a random access signal to the base stations  104 . Additionally, the first active UE  208 A may transmit the random access signal to one or more active UE  208 . The second active UE  208 B may receive (block  906 ) transmission attributes. The second active UE  208 B may also receive (block  908 ) the random access signal from the first active UE  208 A and may transmit (block  910 ) the random access signal to the base stations  104 . The base stations  104  may receive (block  912 ) the random access signal from the first active UE  208 A and/or the second active UE  208 B. At block  914 , the base stations  104  may transmit an acknowledgement message based on the one or more random access signals. The base stations  104  may also transmit (block  916 ) an access response message to first active UE  208 A and second active UE  208 B. The first active UE  208 A may receive (block  918 ) the access response message from the base stations  104 . The first active UE  208 A may adjust (block  920 ) an operating state associated with the first active UE  208 A based on the access response message. For example, the first active UE  208 A may begin a connected mode. The second active UE  208 B may receive (block  920 ) the access response message from the base stations  104 . The second active UE  208 A may adjust (block  922 ) an operating state associated with the second active UE  208 A based on the access response message. For example, the second active UE  208 A may begin the connected mode. 
       FIG.  12    is a flowchart of a method  1000  to establish a connection between the group of user equipment  206  and the wireless communication network, according to embodiments of the present disclosure. Any suitable device (e.g., a controller) that may control components of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , such as one or more respective processors  12  of these devices, may perform the method  1000 . In some embodiments, the method  1000  may be implemented by executing instructions stored in a tangible, non-transitory, computer-readable medium, such as the one or more respective memories  14  or storages  16  of these devices, using the processors  12 . For example, the method  1000  may be performed at least in part by one or more software components, such as one or more respective operating systems of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210 , one or more software applications of the network  102 , the base stations  104 , the application server  202 , the group of user equipment (UE)  206 , the active UEs  208 , and/or the passive UEs  210  and the like. While the method  1000  is described using steps in a specific sequence, it should be understood that the present disclosure contemplates that the described steps may be performed in different sequences than the sequence illustrated, and certain described steps may be skipped or not performed altogether. 
     The base station may transmit an indication of an access response message on a downlink control channel. At block  1002 , the active UE  208  may receive an indication of the access response message via a first downlink channel from the base stations  104 . The base stations  104  may transmit the access response message to any number of active UE  208 . The access response message may include communication information associated with the wireless communication network  102 . The base stations  104  may also transmit information associated with a downlink shared channel. The active UE  208  may receive (block  1004 ) the control information via the first downlink channel. Any number of active UE  208  may monitor the downlink control channel and may receive the control channel information from the base stations  104  via the downlink control channel. The active UE  208  may transmit (block  1006 ) the control information to a set of active UEs  208 . In certain embodiments, the active UE  208  may transmit the control information to the primary UE. The primary user equipment may aggregate and/or assemble control channel signal for processing and decoding control channel information. The active UE  208  may receive and/or decode the control channel information and may transmit the control channel information to the primary user equipment. The control channel information may include downlink control information that identifies information associated with a transmission (e.g., the acknowledgement message) on the downlink shared channel. The active UE  208  may utilize the information to receive the access response message via the downlink shared channel. The active UE  208  may receive (block  1008 ) the access response message via a second downlink channel based on the control information. The active UE  208  may receive (block  1010 ) an acknowledgement based on the access response message. The active UE  208  may receive (block  1012 ) second control information based on the access response message. The primary user equipment may receive the second control information and may determine communication parameters (e.g., time, frequency, temporary identifier, timing adjustment, and so forth) associated with transmission of an access message. The primary user equipment may transmit the communication parameters to the active UE  208 . The active UE  208  may transmit (block  1014 ) the access message via a second uplink channel based on the second control information. The active UE  208  may receive (block  1016 ) a transition message. In certain embodiments, the primary user equipment may transmit the transition message to any number of active UE  208 . The active UE  208  may adjust (block  1018 ) an operating state based on the transition message. For example, the active UE  208  may begin the connected mode. The active UE  208  may establish a connection with the wireless communication network  102 . 
     In an embodiment, an electronic device includes a transmitter, a receiver, and a processor coupled to the transmitter and the receiver. The processor receives a synchronization signal via a wireless communication network, transmits a reference signal based on the synchronization signal, receives a message from a first user equipment based on the reference signal, and establishes a device-to-device communication link between the first user equipment and a second user equipment. 
     The processor also performs a configuration based on the message. 
     The processor also selects the reference signal from a set of reference signals based on a set of communication factors. 
     The processor also transmits a wake-up signal to the first user equipment via the device-to-device communication link The wake-up signal causes the first user equipment to activate a cellular receiver. Each reference signal of the set of reference signals includes a corresponding frequency. 
     The set of communication factors includes a location factor associated with the second user equipment. 
     The processor also scans for a second reference signal based on the synchronization signal. 
     The synchronization signal includes a frame boundary associated with the wireless communication network. 
     In another embodiment, a method includes receiving, at a first user equipment, a set of user equipment attributes associated with the first user equipment, receiving at the first user equipment, a set of connection criteria associated with a wireless communication network, and establishing a device-to-device communication link with a second user equipment based on the set of user equipment attributes satisfying at least one of the set of connection criteria. 
     The method also includes broadcasting a reference signal to one or more user equipment based on the set of user equipment attributes satisfying the at least one of the set of connection criteria. 
     The method also includes receiving, at the first user equipment, a message from the second user equipment based on the reference signal. 
     The method also includes scanning for a second reference signal based on the set of user equipment attributes satisfying the at least one of the set of connection criteria. 
     The method also includes receiving the second reference signal from a third user equipment and establishing a second device-to-device communication link with the third user equipment. 
     The set of connection criteria includes a signal strength threshold associated with the wireless communication network, a battery threshold associated with the first user equipment, a geographic area, a time window, or any combination thereof. 
     The set of user equipment attributes includes a battery level associated with the first user equipment, a location associated with the first user equipment, a power connection associated with the first user equipment, a signal strength associated with the wireless communication network, or any combination thereof. 
     In yet another embodiment, one or more non-transitory, tangible, computer-readable media store instructions that cause a processor to receive a message from a first user equipment associated with membership in a group of user equipment, wherein the group of user equipment comprises the first user equipment and a second user equipment, adjust a set of device identifiers associated with the group of user equipment based on the message, and transmit the set of device identifiers to a base station associated with a wireless communication network. 
     The instructions also cause the processor to determine a signal strength associated with a device-to-device communication link between the second user equipment and a third user equipment, the group of user equipment comprising the third user equipment. 
     The instructions also cause the processor to transmit an exit message to the third user equipment based on the signal strength failing to satisfy a signal strength threshold. 
     The instructions also cause the processor to terminate the device-to-device communication link between the second user equipment and the third user equipment based on the signal strength failing to satisfy the signal strength threshold. 
     The instructions also cause the processor to update the set of device identifiers associated with the group of user equipment based on the signal strength failing to satisfy the signal strength threshold. 
     The instructions also cause the processor to determine an elapsed time from receiving a previous message associated with a third user equipment, the group of user equipment comprising the third user equipment and terminate the device-to-device communication link between the second user equipment and the third user equipment based on the elapsed time exceeding a threshold time duration. 
     In an embodiment, an electronic device includes a transmitter, a receiver, and a processor coupled to the transmitter and the receiver. The processor receives a synchronization signal associated with a wireless communication network from a base station, receives a first set of synchronization attributes based on the synchronization signal, and receives a second set of synchronization attributes from a second user equipment, the second user equipment being configured to receive the synchronization signal from the base station. The processor also transmits the first set of synchronization attributes to the second user equipment based on the first set of synchronization attributes correlating with the second set of synchronization attributes. 
     The processor also causes the second user equipment to establish a connection with the wireless communication network based on the first set of synchronization attributes. 
     The processor also transmits the first set of synchronization attributes to a third user equipment. 
     The processor causes the third user equipment to establish a connection with the wireless communication network based on the first set of synchronization attributes. 
     The processor transmits a first set of reference signals to the base station, the base station receiving a second set of reference signals from the second user equipment. 
     The processor also receives a set of phases associated with the first set of reference signals or the second set of reference signals from the base station and transmits the set of phases to the second user equipment. 
     The first set of synchronization attributes comprises a synchronization frequency, a synchronization time, or both. 
     In another embodiment, a method includes receiving, at a first user equipment, a first portion of system information associated with a wireless communication network from a base station, receiving, at the first user equipment, a second portion of system information associated with the wireless communication network from a second user equipment via a device-to-device communication link, and establishing a connection with the wireless communication network based at least in part on the first portion of system information and the second portion of system information. 
     The method also includes transmitting the first portion of system information to the second user equipment. 
     The method also includes causing the second user equipment to establish a connection with the wireless communication network based at least in part of the first portion of system information and the second portion of system information. 
     The method also includes receiving a frequency associated with the wireless communication network, a cell identifier associated with the wireless communication network, or both based at least in part on the first portion of system information and the second portion of system information. 
     The method also includes transmitting the first portion of system information and the second portion of system information to a third user equipment via a second device-to-device communication link 
     The method also includes causing the third user equipment to establish a connection with the wireless communication network based on the first portion of system information and the second portion of system information. 
     The method also includes transmitting a set of user equipment attributes associated with the first user equipment to the second user equipment and causing the second user equipment to receive a synchronization signal based on the set of user equipment attributes. 
     In yet another embodiment, one or more non-transitory, tangible, computer-readable media store instructions that cause a processor to receive a first synchronization signal from a base station via a wireless communication network, receive a second synchronization signal from a second user equipment via a device-to-device communication link, receive a set of system information based on the first synchronization signal and the second synchronization signal, and establish a connection with the wireless communication network based at least in part on the set of system information. 
     The instructions also cause the processor to transmit the set of system information to the second user equipment and cause the second user equipment to establish a connection with the wireless communication network based on the set of system information. 
     The instructions also cause the processor to receive a second set of system information associated with the wireless communication network from a third user equipment and establish a second connection with the wireless communication network based on the second set of system information. 
     The instructions also cause the processor to transmit the second set of system information to a fourth user equipment and cause the fourth user equipment to establish a connection with the wireless communication network based on the second set of system information. 
     The instructions also cause the processor to receive a set of network attributes associated with the wireless communication network based on the set of system information. 
     The instructions also cause the processor to establish the connection with the wireless communication network based on the set of network attributes. 
     In yet another embodiment, an electronic device includes a transmitter, a receiver, and a processor coupled to the transmitter and the receiver. The processor transmits an access signal to a set of user equipment within a group of user equipment, transmits a set of transmission attributes associated with the access signal to the set of user equipment, and causes the set of user equipment to transmit the access signal to a base station of a wireless communication network based on the set of transmission attributes. 
     The processor also receives an acknowledgment message from the base station via a first channel and receives control information associated with a second channel based on the acknowledgement message. 
     The processor also receives a response message via the second channel based on the control information. 
     The processor also transmits the control information to the set of user equipment and causes at least one user equipment of the set of user equipment to receive a response message via the second channel based on the control information. 
     The processor also receives second control information from the base station based on the response message and transmits an access message to the base station via the second channel. 
     The processor also transmits the second control information to the set of user equipment and causes the set of user equipment to transmit the access message to the base station based on the second control information. 
     The processor also causes the base station to transmit a transition message based on the access message and adjusts an operational mode based on the transition message. 
     In another embodiment, a method includes receiving an access signal from a group of user equipment, transmitting an acknowledgement message to the group of user equipment via a first channel, transmitting a response message to the group of user equipment via a second channel, and causing at least one user equipment of the group of user equipment to receive the response message based on the acknowledgement message. 
     The acknowledgement message comprises information associated with the second channel. 
     The method also includes causing the at least one user equipment to transmit an access message based on the response message. 
     The response message includes a frequency associated with the access message, a time associated with the access message, or both. 
     The method also includes receiving the access message, transmitting a transition message based on the access message, and causing the at least one user equipment to adjust an operational mode based on the transition message. 
     The method also includes receiving a set of reference signals from a set of user equipment, each reference signal associated with a corresponding phase, selecting a first reference signal from the set of reference signals based on a signal strength associated with the first reference signal, and transmitting information associated with the first reference signal to the at least one user equipment. 
     In another embodiment, one or more non-transitory, tangible, computer-readable media store instructions that cause a processor to receive a set of reference signals associated with a group of user equipment, each reference signal associated with a corresponding phase, select a reference signal from the set of reference signals based at least in part on a signal strength associated with the reference signal, transmit information associated with the reference signal to at least one user equipment of the group of user equipment, and cause the at least one user equipment to transmit the information to the group of user equipment. 
     The instructions also cause the processor to receive an access message from the group of user equipment based on a first phase associated with the reference signal. 
     The instructions also cause the processor to transmit data to the at least one user equipment of the group of user equipment and cause the at least one user equipment to transmit the data to the group of user equipment. 
     The instructions also cause the processor to transmit a transition message to the at least one user equipment, the transition message adjusting an operational mode of the at least one user equipment. 
     The instructions also cause the processor to transmit a configuration message associated with a timing for the group of user equipment to the at least one user equipment and cause the at least one user equipment to transmit one or more messages based on the timing. 
     The timing includes a delay associated with a device-to-device communication link between the at least one user equipment and a second user equipment of the group of user equipment. 
     The instructions also cause the processor to retransmit the configuration message to the at least one user equipment based on an elapsed time meeting or exceeding the delay. 
     The specific embodiments described above have been shown by way of example, and it should be understood that these embodiments may be susceptible to various modifications and alternative forms. It should be further understood that the claims are not intended to be limited to the particular forms disclosed, but rather to cover all modifications, equivalents, and alternatives falling within the spirit and scope of this disclosure. 
     The techniques presented and claimed herein are referenced and applied to material objects and concrete examples of a practical nature that demonstrably improve the present technical field and, as such, are not abstract, intangible or purely theoretical. Further, if any claims appended to the end of this specification contain one or more elements designated as “means for [perform]ing [a function] . . . ” or “step for [perform]ing [a function] . . . ,” it is intended that such elements are to be interpreted under 35 U.S.C. 112(f). However, for any claims containing elements designated in any other manner, it is intended that such elements are not to be interpreted under 35 U.S.C. 112(f). 
     It is well understood that the use of personally identifiable information should follow privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy of users. In particular, personally identifiable information data should be managed and handled so as to minimize risks of unintentional or unauthorized access or use,