Patent Publication Number: US-2023134248-A1

Title: Electronic equipment, user equipment, wireless communication method, and storage medium

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application is a continuation of U.S. application Ser. No. 17/045,761, filed Oct. 7, 2020, which is based on PCT filing PCT/CN2019/090805, filed Jun. 12, 2019, which claims priority to Chinese Patent Application No. 201810631484.8, filed Jun. 19, 2018 with the Chinese Patent Office, each of which are incorporated herein by reference in its entirety. 
    
    
     FIELD 
     Embodiments of the present disclosure generally relates to the field of wireless communications, and in particular to an electronic equipment, a user equipment, a wireless communication method and a computer readable storage medium. More particularly, the present disclosure relates to an electronic equipment serving as a network side equipment in a wireless communication system, a user equipment in a wireless communication system, a wireless communication method performed by a network side equipment in a wireless communication system, a wireless communication method performed by a user equipment in a wireless communication system and a computer readable storage medium. 
     BACKGROUND 
     In a satellite communication system, a user equipment may directly communicate with a satellite equipment so as to exchange control information and data information. That is, the user equipment may send uplink control information and uplink data information to the satellite equipment via an uplink and the satellite equipment may send downlink control information and downlink data information to the user equipment via a downlink. 
     As is well-known, the satellite equipment is far from the ground. That is, the satellite equipment is far from the user equipment. Therefore, communications between the user equipment and the satellite equipment may consume relatively large transmission power and result in relatively large time delay, which are more obvious in uplink transmission. Before performing data transmission with the satellite equipment, the user equipment is required to acquire control information related to the data transmission from the satellite equipment, resulting in large transmission power consumption and a large time delay. In addition, multiple user equipments in close proximity to each other may acquire the same or similar control information related to data transmission. Therefore, a case that each of multiple users acquires the control information from the satellite equipment may result in unnecessary overhead. 
     Therefore, it is required to provide a technical solution, to assist a user equipment in a satellite communication system in acquiring control information related to data transmission quickly and effectively, thereby improving transmission between the user equipment and the satellite equipment. 
     SUMMARY 
     The summary part provides a general summary of the present disclosure, rather than a comprehensive disclosure of a full scope or all features of the present disclosure. 
     An object of the present disclosure is to provide an electronic equipment, a user equipment, a wireless communication method and a computer readable storage medium, to assist a user equipment in a satellite communication system in acquiring control information related to data transmission quickly and effectively, thereby improving transmission between the user equipment and a satellite equipment. 
     According to an aspect of the present disclosure, an electronic equipment is provided. The electronic equipment includes processing circuitry. The processing circuitry is configured to: receive, from a user equipment, a random access request message of desiring to access a satellite equipment; and send a time advance between the user equipment and a satellite equipment to be accessed, to the user equipment, in response to the random access request message. 
     According to another aspect of the present disclosure, a user equipment is provided. The user equipment includes processing circuitry. The processing circuitry is configured to: send, to a network side equipment, a random access request message of desiring to access a satellite equipment; and receive, from the network side equipment, a time advance between the user equipment and a satellite equipment that the user equipment is to access. 
     According to another aspect of the present disclosure, a wireless communication method performed by an electronic equipment is provided. The method includes: receiving, from a user equipment, a random access request message of desiring to access a satellite equipment; and sending, to the user equipment, a time advance between the user equipment and a satellite equipment to be accessed in response to the random access request message. 
     According to another aspect of the present disclosure, a wireless communication method performed by a user equipment is provided. The method includes: sending, to a network side equipment, a random access request message of desiring to access a satellite equipment; and receiving, from the network side equipment, a time advance between the user equipment and a satellite equipment that the user equipment is to access. 
     According to another aspect of the present disclosure, a computer readable storage medium is provided. The computer readable storage medium includes executable computer instructions that, when executed by a computer, cause the computer to perform the wireless communication method according to the present disclosure. 
     With the electronic equipment, the user equipment, the wireless communication method and the computer readable storage medium according to the present disclosure, the electronic equipment may configure control information related to data transmission between the user equipment and a satellite equipment and send the configured control information to the user equipment. In this way, the electronic equipment may assist the user equipment in acquiring the control information related to the data transmission, thereby preventing the user equipment from acquiring the control information from the satellite equipment with large transmission power and large time delay. In addition, the electronic equipment may assist multiple user equipments in acquiring the control information, thereby avoiding redundant acquisition. In view of the above, with the electronic equipment, the user equipment, the wireless communication method and the computer readable storage medium according to the present disclosure, a user equipment in a satellite communication system can acquire the control information related to uplink transmission quickly and effectively, thereby improving transmission between the user equipment and the satellite equipment. 
     A further applicable field becomes apparent from the description herein. The description and specific examples in the summary are only illustrative and are not intended to limit the scope of the present disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The drawings described herein are used for illustrating the selected embodiments only rather than all of possible embodiments, and are not intended to limit the scope of the present disclosure. In the drawings: 
         FIG.  1    is a schematic diagram showing communications between a UE (User Equipment) and a satellite equipment; 
         FIG.  2 ( a )  is a schematic diagram showing communications between a UE and a satellite equipment according to an embodiment of the present disclosure; 
         FIG.  2 ( b )  is a schematic diagram showing communications between a UE and a satellite equipment according to an embodiment of the present disclosure; 
         FIG.  3    is a block diagram showing a configuration example of an electronic equipment according to an embodiment of the present disclosure; 
         FIG.  4    is a schematic diagram showing a process of sending control information in a time division multiplexing manner by a network side equipment and a satellite equipment according to an embodiment of the present disclosure; 
         FIG.  5    is a flowchart showing signaling for acquiring a time advance by a UE according to an embodiment of the present disclosure; 
         FIG.  6 ( a )  is a flowchart showing signaling for acquiring a time advance by a UE according to an embodiment of the present disclosure; 
         FIG.  6 ( b )  is a flowchart showing signaling for acquiring a time advance by a UE according to another embodiment of the present disclosure; 
         FIG.  6 ( c )  is a flowchart showing signaling for acquiring a time advance by a UE according to another embodiment of the present disclosure; 
         FIG.  7 ( a )  is a flowchart showing signaling for acquiring an updated time advance by a UE according to an embodiment of the present disclosure; 
         FIG.  7 ( b )  is a flowchart showing signaling for acquiring an updated time advance by a UE according to another embodiment of the present disclosure; 
         FIG.  7 ( c )  is a flowchart showing signaling for acquiring an updated time advance by a UE according to another embodiment of the present disclosure; 
         FIG.  8 ( a )  is a flowchart showing signaling for acquiring uplink resources by a UE according to an embodiment of the present disclosure; 
         FIG.  8 ( b )  is a flowchart showing signaling for acquiring uplink resources by a UE according to another embodiment of the present disclosure; 
         FIG.  8 ( c )  is a flowchart showing signaling for acquiring uplink resources by a UE according to another embodiment of the present disclosure; 
         FIG.  9 ( a )  is a flowchart showing signaling for acquiring uplink transmission power by a UE according to an embodiment of the present disclosure; 
         FIG.  9 ( b )  is a flowchart showing signaling for acquiring uplink transmission power by a UE according to another embodiment of the present disclosure; 
         FIG.  9 ( c )  is a flowchart showing signaling for acquiring uplink transmission power by a UE according to another embodiment of the present disclosure; 
         FIG.  10 ( a )  is a flowchart showing signaling for acquiring uplink transmission power for a UE by a network side equipment according to an embodiment of the present disclosure; 
         FIG.  10 ( b )  is a flowchart showing signaling for acquiring uplink transmission power for a UE by a network side equipment according to another embodiment of the present disclosure; 
         FIG.  11 ( a )  is a flowchart showing signaling for selecting a satellite equipment for a UE according to an embodiment of the present disclosure; 
         FIG.  11 ( b )  is a flowchart showing signaling for selecting a satellite equipment for a UE according to another embodiment of the present disclosure; 
         FIG.  11 ( c )  is a flowchart showing signaling for selecting a satellite equipment for a UE according to another embodiment of the present disclosure; 
         FIG.  12 ( a )  is a flowchart showing signaling for switching a satellite equipment of a UE according to an embodiment of the present disclosure; 
         FIG.  12 ( b )  is a flowchart showing signaling for switching a satellite equipment of a UE according to another embodiment of the present disclosure; 
         FIG.  12 ( c )  is a flowchart showing signaling for switching a satellite equipment of a UE according to another embodiment of the present disclosure; 
         FIG.  13    is a block diagram showing a configuration example of a user equipment according to an embodiment of the present disclosure; 
         FIG.  14    is a flowchart of a wireless communication method performed by an electronic equipment according to an embodiment of the present disclosure; 
         FIG.  15    is a flowchart of a wireless communication method performed by a user equipment according to an embodiment of the present disclosure; 
         FIG.  16    is a block diagram showing a first example of exemplary configuration of an eNB (Evolved Node B); 
         FIG.  17    is a block diagram showing a second example of the exemplary configuration of the eNB; 
         FIG.  18    is a block diagram showing exemplary configuration of a smartphone; and 
         FIG.  19    is a block diagram showing exemplary configuration of a vehicle navigation equipment. 
     
    
    
     Although the present disclosure is susceptible to various modifications and substitutions, specific embodiments thereof are shown in the drawings as examples and are described in detail herein. However, it should be understood that the description of specific embodiments herein is not intended to limit the present disclosure into a disclosed specific form. Instead, the present disclosure aims to cover all modifications, equivalents and substitutions within the spirit and the scope of the present disclosure. It should be noted that, corresponding reference numerals indicate corresponding components throughout the drawings. 
     DETAILED DESCRIPTION OF EMBODIMENTS 
     Examples of the present disclosure are described more fully with reference to the drawings. The following description is merely illustrative in nature and is not intended to limit the present disclosure, application or use. 
     Exemplary embodiments are provided so that the present disclosure can become exhaustive and the scope of the present disclosure can be fully conveyed to those skilled in the art. Examples of various specific details such as specific components, apparatuses, and methods are set forth to provide detailed understanding of the embodiments of the present disclosure. It is apparent to those skilled in the art that without specific details, the exemplary embodiments may be implemented in multiple different forms, none of which is construed as limiting the scope of the present disclosure. In some exemplary embodiments, well-known processes, well-known structures, and well-known technologies are not described in detail. 
     Exemplary embodiments are described in the following order:
         1. Description of a scenario   2. Configuration example for a network side equipment   3. Configuration example for a user equipment   4. Method embodiment   5. Application example       

     1. Description of a Scenario 
       FIG.  1    is a schematic diagram showing communications between a UE and a satellite equipment. As shown in  FIG.  1   , a solid line between the UE and the satellite equipment represents transmission of data information and a dotted line between the UE and the satellite equipment represents transmission of control information. That is, the user equipment may send uplink control information and uplink data information to the satellite equipment via an uplink and the satellite equipment may send downlink control information and downlink data information to the user equipment via a downlink. As described above, when the user equipment acquires control information related to data transmission from the satellite equipment, large transmission power may be consumed and large time delay may be caused. In addition, a case that each of multiple user equipments in close proximity to each other acquires the control information from the satellite equipment may result in unnecessary overhead. 
     A solution is provided according to the present disclosure to expect a network side equipment on the ground to assist a user equipment in acquiring control information, thereby preventing the user equipment from acquiring control information from the satellite equipment with large transmission power and large time delay. In addition, the network side equipment may assist multiple user equipments in acquiring the control information, thereby avoiding redundant acquisition. 
       FIG.  2 ( a )  is a schematic diagram showing communications between a UE and a satellite equipment according to an embodiment of the present disclosure. As shown in  FIG.  2 ( a ) , the UE sends and receives data information via a link between the UE and the satellite equipment. Further, the UE may acquire control information between the UE and the satellite equipment via information interaction between the UE and the network side equipment.  FIG.  2 ( b )  is a schematic diagram showing communications between a UE and a satellite equipment according to an embodiment of the present disclosure. In the example shown in  FIG.  2 ( b ) , the UE may not only acquire partial control information between the UE and the satellite equipment via a network side equipment, but also directly acquire partial control information from the satellite equipment. 
     According to an embodiment of the present disclosure, each of the user equipment, the network side equipment and the satellite equipment may be arranged in a wireless communication system. The wireless communication system herein may be a satellite communication system. The satellite equipment may have all functions of a base station equipment. In addition, the satellite equipment may only have a function of transmitting and receiving. The satellite equipment may process information via a processor arranged on the ground. 
     Further, the network side equipment according to the present disclosure may be a network side equipment having a function of transmitting and receiving information on the ground. For example, the network side equipment may be a transceiver on the ground. In this case, the network side equipment may be a transmitting-receiving equipment specifically for assisting a UE in acquiring control information related to data communications between the UE and the satellite equipment. That is, multiple transmitting-receiving equipments may be arranged on the ground based on geographic positions. Each of the multiple transmitting-receiving equipments may assist a UE in a certain range around the transmitting-receiving equipment in acquiring control information related to data communications between the UE and the satellite equipment. In addition, the network side equipment may also be, for example, a TRP (Transmit and Receive Port) or a base station equipment. The TRP may have a function of transmitting and receiving. For example, the TRP may receive information from a user equipment and a base station equipment and may further send information to a user equipment and a base station equipment. In an example, the TRP may serve a user equipment and may be controlled by a base station equipment. That is, the base station equipment serves the user equipment via the TRP. The base station equipment, for example, may be an eNB or a gNB (a base station in a fifth generation communication system). 
     The user equipment according to the present disclosure may be a mobile terminal (such as a smartphone, a tablet personal computer (PC), a notebook PC, a portable game terminal, a portable/dongle mobile router and a digital camera) or a vehicle terminal (such as a vehicle navigation equipment). The user equipment may further be implemented as a terminal performing machine to machine (M2M) communications (which is also referred to as a machine type communication (MTC) terminal). In addition, the user equipment may further be a wireless communication module (such as an integrated circuitry module including a single wafer) mounted on each of the above terminals. 
     2. Configuration Example for a Network Side Equipment 
       FIG.  3    is a block diagram showing a configuration example of an electronic equipment  300  according to an embodiment of the present disclosure. The electronic equipment  300  may serve as a network side equipment in a wireless communication system. Specifically, the electronic equipment  300  may serve as a network side equipment having a function of transmitting and receiving information on the ground in a wireless communication system, such as a base station equipment or a TRP. 
     As shown in  FIG.  3   , the electronic equipment  300  may include a communicating unit  310  and a configuring unit  320 . 
     Here, units of the electronic equipment  300  may be included in processing circuitry. It should be noted that the electronic equipment  300  may include one processing circuitry or multiple processing circuitry. Further, the processing circuitry may include various separate functional units to perform various functions and/or operations. It should be noted that these functional units may be physical entities or logical entities, and units with different names may be implemented by one physical entity. 
     According to an embodiment of the present disclosure, the configuring unit  320  may configure control information related to data transmission between a user equipment and a satellite equipment. 
     According to an embodiment of the present disclosure, the electronic equipment  300  may send the configured control information to the user equipment via the communicating unit  310 . 
     According to an embodiment of the present disclosure, the user equipment may be within a service coverage of the electronic equipment  300 . That is, the electronic equipment  300  may be a network side equipment and may send, to each user equipment within the service coverage of the electronic equipment  300 , control information configured for the user equipment. 
     It can be seen that the electronic equipment  300  according to the embodiment of the present disclosure may configure control information related to data transmission between a user equipment and a satellite equipment and send the configured control information to the user equipment. In this way, the electronic equipment  300  may assist the user equipment in acquiring control information related to data transmission, thereby preventing the user equipment from acquiring control information from the satellite equipment with large transmission power and large time delay. In addition, the electronic equipment  300  may assist multiple user equipments in acquiring the control information, thereby avoiding redundant acquisition. 
     According to an embodiment of the present disclosure, the control information related to data transmission between the user equipment and the satellite equipment may include control information related to uplink data transmission between the user equipment and the satellite equipment. 
     For example, the control information may include a physical layer parameter related to uplink data transmission between the user equipment and the satellite equipment. The physical layer parameter includes but is not limited to uplink transmission power for the user equipment, a Time Advance (TA) for the user equipment, a Modulation and Coding Scheme (MCS) for the user equipment and uplink resources for the user equipment. 
     Preferably, the control information may further include information related to a satellite equipment that the user equipment is to access, including but not limited to a satellite equipment initially accessed by the user equipment and a satellite equipment to which the user equipment is to switch. 
     In addition, according to an embodiment of the present disclosure, the electronic equipment  300  may send all control information related to data transmission between the user equipment and the satellite equipment to the user equipment. That is, the user equipment acquires control information from the electronic equipment  300  rather than the satellite equipment. Further, according to an embodiment of the present disclosure, the electronic equipment  300  may send partial control information related to data transmission between the user equipment and the satellite equipment to the user equipment. That is, the satellite equipment may also send partial control information related to data transmission between the user equipment and the satellite equipment to the user equipment. 
     Further, according to an embodiment of the present disclosure, the communicating unit  310  may send the control information by resources different from those used by a satellite equipment. Here the satellite equipment may be a satellite equipment that the user equipment is to access or a satellite equipment currently accessed by the user equipment. Here, different resources include different time resources and different frequency resources. 
       FIG.  4    is a schematic diagram showing a process of sending control information in a time division multiplexing manner by a network side equipment and a satellite equipment according to an embodiment of the present disclosure.  FIG.  4    shows time domain resources for sending the control information to the user equipment. For example, each square in  FIG.  4    represents a subframe. In a conventional design, all subframes are used for the satellite equipment to send the control information to the user equipment. According to the embodiment of the present disclosure, the satellite equipment may select one or more blank subframes (represented by squares with oblique lines) from all subframes. In the blank subframes, the satellite equipment does not send the control information to the user equipment. In this way, the electronic equipment  300  may send the control information to the user equipment by using the blank subframes. That is, the electronic equipment  300  and the satellite equipment send the control information to the user equipment in the time division multiplexing manner. 
     In addition, the electronic equipment  300  and the satellite equipment may also send the control information to the user equipment in a frequency division multiplexing manner or another multiplexing manner, which is not limited in the present disclosure. 
     According to an embodiment of the present disclosure, the electronic equipment  300  may use control information related to uplink data transmission between the electronic equipment  300  and the satellite equipment as control information related to uplink data transmission between the user equipment and the satellite equipment. That is, the electronic equipment  300  may instead the user equipment calculating or acquiring the control information related to data transmission between the electronic equipment  300  and the satellite equipment. The measured or acquired control information serves as the control information related to data transmission between the user equipment and the satellite equipment. 
     A process of acquiring the control information by the user equipment is described below based on types of the control information. 
     According to an embodiment of the present disclosure, the control information may include a TA for the user equipment. That is, the configuring unit  320  may configure a TA for the user equipment. According to an embodiment of the present disclosure, when initially accessing a satellite equipment, the user equipment may acquire a TA and update the TA based on a certain rule. 
     According to an embodiment of the present disclosure, the electronic equipment  300  may receive, from a user equipment, a random access request message of desiring to access a satellite equipment via the communicating unit  310 . 
     Further, according to an embodiment of the present disclosure, in response to the random access request message, the configuring unit  320  may configure control information including a TA between the user equipment and a satellite equipment to be accessed, and send the TA between the user equipment and the satellite equipment to be accessed to the user equipment via the communicating unit  310 . 
     According to an embodiment of the present disclosure, the communicating unit  310  of the electronic equipment  300  may send the TA via a random access response message. 
       FIG.  5    is a flowchart showing signaling for acquiring a time advance by a UE according to an embodiment of the present disclosure. As shown in  FIG.  5   , in step S 501 , the UE sends a random access request message to a network side equipment. Next, in step S 502 , the network side equipment acquires a TA of an uplink between the network side equipment and a satellite equipment from the satellite equipment or calculates a TA of the uplink between the network side equipment and the satellite equipment. Next, in step S 503 , the network side equipment sends a random access response message to the UE. The random access response message includes the calculated or acquired TA. 
     According to an embodiment of the present disclosure, the random access request message may include a random access code representing that the user equipment desires to access a satellite equipment. As shown in  FIG.  3   , the electronic equipment  300  may further include a decoding unit  330 . The decoding unit  330  is configured to decode the random access request message to acquire the random access code in the random access request message. Further, the decoding unit  330  may determine that the user equipment desires to access a satellite equipment based on the acquired random access code, such that the configuring unit  320  may configure a TA of a data link between the user equipment and the satellite equipment for the user equipment. In addition, in a case that the decoding unit  330  determines that the user equipment desires to access the electronic equipment  300  based on the acquired random access code, the configuring unit  320  may configure a TA of a data link between the user equipment and the electronic equipment  300  for the user equipment. 
     As described above, the electronic equipment  300  may instead the user equipment calculating or acquiring the control information related to the data transmission between the electronic equipment  300  and the satellite equipment, and use the control information related to data transmission between the electronic equipment  300  and the satellite equipment as the control information related to data transmission between the user equipment and the satellite equipment. Therefore, according to an embodiment of the present disclosure, the configuring unit  320  may use a TA between the electronic equipment  300  and the satellite equipment to be accessed as a TA between the user equipment and the satellite equipment to be accessed. 
     According to an embodiment of the present disclosure, the TA between the electronic equipment  300  and the satellite equipment that the user equipment is to access may be calculated by the satellite equipment that the user equipment is to access. The communicating unit  310  of the electronic equipment  300  may receive the TA between the electronic equipment  300  and the satellite equipment that the user equipment is to access from the satellite equipment that the user equipment is to access. Further, the electronic equipment  300  may send pilot frequency information to the satellite equipment, such that the satellite equipment may calculate the TA between the electronic equipment  300  and the satellite equipment based on the pilot frequency information. 
     According to an embodiment of the present disclosure, the TA between the electronic equipment  300  and the satellite equipment that the user equipment is to access may be calculated by the electronic equipment  300 . For example, the configuring unit  320  may calculate the TA based on a position of the satellite equipment that the user equipment is to access. According to an embodiment of the present disclosure, the electronic equipment  300  may send a satellite position request message to the satellite equipment and receive a satellite position response message from the satellite equipment. The response message carries the position of the satellite. Specifically, the configuring unit  320  may calculate the TA between the electronic equipment  300  and the satellite equipment based on a distance between the electronic equipment  300  and the satellite equipment that the user equipment is to access. For example, the configuring unit  320  may acquire the TA by dividing the distance between the electronic equipment  300  and the satellite equipment that the user equipment is to access by the velocity of light. 
     In addition, according to an embodiment of the present disclosure, as shown in  FIG.  3   , the electronic equipment  300  may further include a storing unit  340 . The storing unit  340  is configured to store a correspondence between time information and a TA. As is well-known, orbit information of a satellite equipment is fixed. Therefore, a position of the satellite equipment at every time instant is fixed and there is a correspondence between time information and a position of the satellite equipment. According to an embodiment of the present disclosure, the electronic equipment  300  may calculate, based on a position of the satellite equipment at each time instant, a TA between the electronic equipment  300  and the satellite equipment at the time instant, thereby establishing a correspondence table representing a correspondence between a time instant and a TA between the electronic equipment  300  and the satellite equipment. According to an embodiment of the present disclosure, the configuring unit  320  may acquire the TA between the electronic equipment  300  and the satellite equipment by looking up the table based on current time information. 
     Further, according to an embodiment of the present disclosure, the electronic equipment  300  may serve multiple user equipments. If another user equipment acquires a TA between the electronic equipment  300  and the satellite equipment from the electronic equipment  300  in a predetermined time period before a current time instant, the electronic equipment  300  may directly use the TA as the TA between the electronic equipment  300  and the satellite equipment without recalculation. 
       FIG.  6 ( a )  to  FIG.  6 ( c )  each is a flowchart showing signaling for acquiring a time advance by a UE according to an embodiment of the present disclosure. 
     As shown in  FIG.  6 ( a ) , in step S 601 , a UE sends a random access request message to a network side equipment. Next, in step S 602 , the network side equipment sends a satellite position request message to a satellite equipment to request a position of the satellite equipment. Next, in step S 603 , the satellite equipment sends a satellite position response message to the network side equipment. The satellite position response message carries position information of the satellite equipment. Next, in step S 604 , the network side equipment calculates a TA between the network side equipment and the satellite equipment based on the position information of the satellite equipment. Next, in step S 605 , the network side equipment sends a random access response message to the UE. The random access response message includes the calculated TA. In this way, the UE acquires the TA for uplink data transmission. 
     As shown in  FIG.  6 ( b ) , in step S 601 , a UE sends a random access request message to a network side equipment. Next, in step S 602 , the network side equipment sends a pilot frequency to a satellite equipment. Next, in step S 603 , the satellite equipment sends a TA between the network side equipment and the satellite equipment to the network side equipment. Next, in step S 604 , the network side equipment sends a random access response message to the UE. The random access response message includes the TA acquired from the satellite equipment. In this way, the UE acquires the TA for uplink data transmission. 
     As shown in  FIG.  6 ( c ) , in step S 601 , a UE sends a random access request message to a network side equipment. Next, in step S 602 , the network side equipment determines, based on current time information, a TA between the network side equipment and the satellite equipment by looking up the corresponding table representing a correspondence between a time instant and a TA between the network side equipment and the satellite equipment. Next, in step S 603 , the network side equipment sends a random access response message to the UE. The random access response message includes the TA acquired by looking up the table. In this way, the UE acquires the TA for uplink data transmission. 
     According to an embodiment of the present disclosure, the configuring unit  320  may periodically configure an updated TA for a user equipment. The communicating unit  310  may periodically send the updated TA to the user equipment. The communicating unit  310  may periodically broadcast, unicast or multicast the updated TA to the user equipment. For example, the communicating unit  310  may carry information for unicasting via DCI (Downlink Control Information) and carry information for multicasting via GC-PDCCH (Group Common-Physical Downlink Control Channel). 
     According to an embodiment of the present disclosure, before each uplink transmission of the user equipment or when the user equipment is in a desynchronizing state, the configuring unit  320  may configure an updated TA for the user equipment. According to an embodiment of the present disclosure, before each time the user equipment is required to perform uplink transmission or when the user equipment determines that the user equipment is in a desynchronizing state, the electronic equipment  300  may receive a TA update request massage from the user equipment, and the configuring unit  320  may configure an updated TA in response to the TA update request massage. The communicating unit  310  may sends the updated TA to the user equipment. Further, according to an embodiment of the present disclosure, the electronic equipment  300  may unicast the updated TA to the user equipment sending the TA update request massage. In addition, the electronic equipment  300  may also broadcast the updated TA until receiving a broadcast stopping request message. 
       FIG.  7 ( a )  to  FIG.  7 ( c )  each is a flowchart showing signaling for acquiring an updated time advance by a UE according to an embodiment of the present disclosure. 
     As shown in  FIG.  7 ( a ) , in step S 701 , a UE may send a TA update request message to a network side equipment. Here when the UE is required to perform uplink transmission or the UE determines that the UE is in a desynchronizing state, the UE sends the TA update request message to the network side equipment. Alternatively, the UE sends the TA update request message to the network side equipment in another case that the UE determines that the UE requires an updated TA. Next, in step S 702 , the network side equipment sends the updated TA to the UE. Here the network side equipment may acquire or calculate an updated UE in any one of manners described above. In this way, the UE may acquire the updated TA. 
     As shown in  FIG.  7 ( b ) , in step S 701 , a network side equipment periodically broadcasts/unicasts/multicasts an updated TA. Similarly, the network side equipment may acquire or calculate the updated TA in any one of manners described above. In this way, the UE may periodically acquire the updated TA. 
     As shown in  FIG.  7 ( c ) , in step S 701 , a UE sends a TA update request message to a network side equipment. Here, when the UE is required to perform uplink transmission or the UE determines that the UE is in a desynchronizing state, the UE may send the TA update request message to the network side equipment. Alternatively, the UE may send the TA update request message to the network side equipment in another case that the UE determines that the UE requires an updated TA. Next, in step S 702 , the network side equipment broadcasts the updated TA. Here the network side equipment may periodically broadcast the updated TA. Next, in step S 703 , the UE sends a broadcast stopping request message to the network side equipment, such that the network side equipment stops broadcasting the updated TA. In this way, the UE may periodically acquire the updated TA. 
     According to an embodiment of the present disclosure, the electronic equipment  300  may send an initial TA by resources different from those used by a satellite equipment to be accessed. The resources may include time resources and frequency resources. The electronic equipment  300  may send an updated TA by resources different from those used by a satellite equipment currently accessed. The resources may include time resources and frequency resources. 
     As described above, when initially accessing the satellite equipment, the UE may acquire the TA related to uplink data transmission from the network side equipment. In this way, the UE is not required to calculate the TA between the UE and the satellite equipment, thereby avoiding time delay and power loss. Further, the network side equipment measures the TA between the network side equipment and the satellite equipment as the TA between the user equipment and the satellite equipment, thereby avoiding repeated measurement for multiple user equipments. Further, after accessing the satellite equipment, the UE may acquire the updated TA from the network side equipment. In this way, the UE is not required to calculate the TA between the UE and the satellite equipment, thereby avoiding time delay and power loss. Further, the network side equipment measures the TA between the network side equipment and the satellite equipment as the TA between the user equipment and the satellite equipment, thereby avoiding repeated measurement for multiple user equipments. 
     According to an embodiment of the present disclosure, the control information may include uplink resources for the user equipment. The configuring unit  320  may configure the control information including the uplink resources. 
     According to an embodiment of the present disclosure, the communicating unit  310  may receive Buffer Status Report (BSR) information from the user equipment and send the Buffer Status Report information to a satellite equipment currently accessed by the user equipment. 
     According to an embodiment of the present disclosure, the communicating unit  310  may further receive uplink resource information for the user equipment from the satellite equipment currently accessed by the user equipment and send the uplink resource information to the user equipment. 
     Here, the BSR may represent a magnitude of resources for uplink data transmission of the user equipment. Therefore, the satellite equipment may determine the uplink resource information for the user equipment based on the BSR of the user equipment. 
     According to an embodiment of the present disclosure, when only receiving a BSR from one user equipment, the electronic equipment  300  may directly send the BSR to the satellite equipment. When receiving BSRs from multiple user equipments accessing one satellite equipment, the electronic equipment  300  may directly send the multiple BSRs from the multiple user equipments together to the satellite equipment without processing the BSRs from the multiple user equipments. For example, it is assumed that a user equipment  1  and a user equipment  2  currently access one satellite equipment, the user equipment  1  sends a BSR of 10 bits, and the user equipment  2  sends a BSR of 20 bits, the electronic equipment  300  may send the BSR of 10 bits and the BSR of 20 bits together to the satellite equipment. In addition, when receiving BSRs from multiple user equipments accessing one satellite equipment, the electronic equipment  300  may merge the BSRs from the multiple user equipments and send a merged BSR to the satellite equipment. That is, the electronic equipment  300  processes the BSRs from the multiple user equipments. The electronic equipment  300  merges the multiple BSRs from the multiple user equipments into a merged BSR and sends the merged BSR to the satellite equipment. For example, it is assumed that a user equipment  1  and a user equipment  2  currently access one satellite equipment, the user equipment  1  sends a BSR of 10 bits, and the user equipment  2  sends a BSR of 20 bits, the electronic equipment  300  may send a merged BSR of 30 bits to the satellite equipment. 
     According to an embodiment of the present disclosure, when only receiving a BSR from one user equipment, the satellite equipment may allocate uplink transmission resources for the user equipment based on the BSR. When receiving BSRs not merged from multiple user equipments, the satellite equipment may allocate uplink transmission resources respectively for the multiple user equipments. Further, when receiving BSRs not merged from multiple user equipments, the satellite equipment may allocate uplink transmission resources for the multiple user equipment as a whole. Further, when receiving a merged BSR from multiple user equipments, the satellite equipment may allocate uplink transmission resources for the multiple user equipment as a whole. 
     According to an embodiment of the present disclosure, when receiving uplink resource information for one user equipment from the satellite equipment, the electronic equipment  300  may directly send the uplink resource information to the user equipment. According to an embodiment of the present disclosure, when receiving merged uplink resource information for multiple user equipments from the satellite equipment, the electronic equipment  300  may determine uplink resource information for each of the multiple user equipments based on the merged uplink resource information. That is, the configuring unit  320  may allocate uplink resources for each user equipment based on the merged uplink resource information, so as to determine uplink resources for each user equipment. 
       FIG.  8 ( a )  to  FIG.  8 ( c )  each is a flowchart showing signaling for acquiring uplink resources by a UE according to an embodiment of the present disclosure. 
     As shown in  FIG.  8 ( a ) , in step S 801 , a UE sends BSR information to a network side equipment. Next, in step S 802 , the network side equipment sends the BSR information to a satellite equipment currently accessed by the UE. Next, in step S 803 , the satellite equipment allocates uplink resources for the UE and directly sends the uplink resources to the UE. In this example, the satellite equipment may directly determine the uplink resources for the UE and the network side equipment is not required to allocate the uplink resources. Further, the satellite equipment directly sends the allocated uplink resources to the UE. 
     As shown in  FIG.  8 ( b ) , in step S 801 , a UE sends BSR information to a network side equipment. Next, in step S 802 , the network side equipment sends the BSR information to a satellite equipment currently accessed by the UE. Next, in step S 803 , the satellite equipment allocates uplink resources for the UE and sends the uplink resources to the network side equipment. Next, in step S 804 , the network side equipment sends the uplink resources to the UE. In this example, the satellite equipment may directly determine the uplink resources for the UE and the network side equipment is not required to allocate the uplink resources. Further, the satellite equipment sends the allocated uplink resources to the UE via the network side equipment. 
     As shown in  FIG.  8 ( c ) , in step S 801 , a UE sends BSR information to a network side equipment. Here, it is assumed that the network side equipment receives BSR information from multiple UEs. Next, in step S 802 , the network side equipment merges the BSRs from the multiple UEs and sends a merged BSR to a satellite equipment. Next, in step S 803 , the satellite equipment allocates uplink resources for the multiple UEs as a whole and sends merged uplink resources to the network side equipment. Next, in step S 804 , the network side equipment allocates, from the merged uplink resources, uplink resources for the UE. Next, in step S 805 , the network side equipment sends, to the UE, the uplink resources allocated for the UE. In this example, the satellite equipment does not directly determine uplink resources for each UE, and the network side equipment allocates uplink resources for each UE. 
     According to an embodiment of the present disclosure, the electronic equipment  300  may send the uplink resource information by resources different from those used by the satellite equipment currently accessed. The resources may include time resources and frequency resources. 
     As described above, after accessing the satellite equipment, the UE may acquire uplink resource information from the network side equipment. The UE acquires uplink resource information from the network side equipment before each uplink transmission of the UE. In this way, the UE is not required to acquire the uplink resources from the satellite equipment, thereby avoiding time delay and power loss. 
     According to an embodiment of the present disclosure, the control information may include uplink transmission power for the user equipment. The configuring unit  320  may configure the control information including the uplink transmission power for uplink data transmission between the user equipment and the satellite equipment. 
     According to an embodiment of the present disclosure, the configuring unit  320  may periodically configure uplink transmission power information for the user equipment. The communicating unit  310  may periodically send the uplink transmission power information to the user equipment. Here, the communicating unit  310  may periodically broadcast, unicast or multicast the uplink transmission power information. For example, the communicating unit  310  may carry information for unicasting via the DCI and carry information for multicasting via the GC-PDCCH. 
     According to an embodiment of the present disclosure, the electronic equipment  300  may send uplink transmission power information to the user equipment in response to uplink transmission power request information from the user equipment. According to an embodiment of the present disclosure, the user equipment may send the uplink transmission power request information before each uplink transmission of the user equipment. That is, the electronic equipment  300  may receive the uplink transmission power request information from the user equipment and send the uplink transmission power information to the user equipment before each uplink transmission of the user equipment. 
       FIG.  9 ( a )  to  FIG.  9 ( c )  each is a flowchart showing signaling for acquiring uplink transmission power by a UE according to an embodiment of the present disclosure. 
     As shown in  FIG.  9 ( a ) , in step S 901 , a UE sends uplink transmission power request information to a network side equipment. Next, in step S 902 , the network side equipment sends uplink transmission power response information to the UE in response to the uplink transmission power request information from the UE. The uplink transmission power response information includes uplink transmission power for the UE. Here the network side equipment may unicast the uplink transmission power response information to the UE. 
     As shown in  FIG.  9 ( b ) , in step S 901 , a network side equipment periodically broadcasts/unicasts/multicasts uplink transmission power for a UE. 
     As shown in  FIG.  9 ( c ) , in step S 901 , a UE sends uplink transmission power request information to a network side equipment. Next, in step S 902 , the network side equipment broadcasts uplink transmission power for the UE in response to the uplink transmission power request information from the UE. Next, in step S 903 , the UE sends a broadcast stopping request to the network side equipment, such that the network side equipment stops broadcasting the uplink transmission power for the UE. 
     As described above, the electronic equipment  300  may calculate or acquire the control information related to data transmission between the electronic equipment  300  and the satellite equipment for the user equipment and use the control information related to data transmission between the electronic equipment  300  and the satellite equipment as the control information related to data transmission between the user equipment and the satellite equipment. According to an embodiment of the present disclosure, the configuring unit  320  may use the uplink transmission power information for uplink transmission between the electronic equipment  300  and the satellite equipment currently accessed by the user equipment as the uplink transmission power information for the user equipment. 
     According to an embodiment of the present disclosure, the uplink transmission power for uplink transmission between the electronic equipment  300  and the satellite equipment currently accessed by the user equipment may be calculated by the satellite equipment currently accessed by the user equipment. The communicating unit  310  of the electronic equipment  300  may receive the uplink transmission power for uplink transmission between the electronic equipment  300  and the satellite equipment currently accessed by the user equipment from the satellite equipment currently accessed by the user equipment. Further, the electronic equipment  300  may send pilot frequency information to the satellite equipment for the satellite equipment to calculate uplink transmission power for uplink transmission between the electronic equipment  300  and the satellite equipment based on the pilot frequency information. 
     According to an embodiment of the present disclosure, the uplink transmission power for uplink transmission between the electronic equipment  300  and the satellite equipment currently accessed by the user equipment may also be calculated by the electronic equipment  300 . For example, the configuring unit  320  may calculate the uplink transmission power based on a position of the satellite equipment currently accessed by the user equipment. According to an embodiment of the present disclosure, the electronic equipment  300  may send a satellite position request massage to the satellite equipment and receive a satellite position response massage from the satellite equipment. The response massage carries the position of the satellite. Specifically, the configuring unit  320  may calculate the uplink transmission power for the electronic equipment  300  based on a distance between the electronic equipment  300  and the satellite equipment currently accessed by the user equipment. 
     In addition, according to an embodiment of the present disclosure, the storing unit  340  of the electronic equipment  300  may further store a correspondence between time information and an uplink transmission power. As is well-known, orbit information of a satellite equipment is fixed. Therefore, a position of the satellite equipment at every time instant is fixed and there is a correspondence between time information and a position of the satellite equipment. According to an embodiment of the present disclosure, the electronic equipment  300  may calculate, based on a position of the satellite equipment at each time instant, uplink transmission power for the electronic equipment  300  at the time instant, thereby establishing a corresponding table representing a correspondence between a time instant and uplink transmission power of the electronic equipment  300 . According to an embodiment of the present disclosure, the configuring unit  320  may acquire the uplink transmission power for the electronic equipment  300  by looking up the table based on current time information. 
     Further, according to an embodiment of the present disclosure, the electronic equipment  300  may serve multiple user equipments. If another user equipment acquires uplink transmission power for the electronic equipment  300  from the electronic equipment  300  in a predetermined time period before a current time instant, the electronic equipment  300  may directly use the uplink transmission power as uplink transmission power for the electronic equipment  300  without recalculation. 
       FIG.  10 ( a )  to  FIG.  10 ( b )  each is a flowchart showing signaling for acquiring uplink transmission power for a UE by a network side equipment according to an embodiment of the present disclosure. 
     As shown in  FIG.  10 ( a ) , in step S 1001 , a network side equipment sends a satellite position request message to a satellite equipment to request a position of the satellite equipment. Next, in step S 1002 , the satellite equipment sends a satellite position response message to the network side equipment. The satellite position response message carries position information of the satellite equipment. Next, in step S 1003 , the network side equipment calculates uplink transmission power for the network side equipment based on the position information of the satellite equipment. 
     As shown in  FIG.  10 ( b ) , in step S 1001 , a network side equipment sends a pilot frequency to a satellite equipment. Next, in step S 1002 , the satellite equipment sends uplink transmission power for the network side equipment to the network side equipment. 
       FIG.  10 ( a )  and  FIG.  10 ( b )  do not show signaling for acquiring, by the electronic equipment  300 , uplink transmission power for the electronic equipment  300  by looking up the corresponding table representing a correspondence between time information and uplink transmission power and based on the uplink transmission power for the electronic equipment  300  in the predetermined time period before a current time instant. After acquiring the uplink transmission power for the electronic equipment  300  as described above, the electronic equipment  300  may use the uplink transmission power as uplink transmission power for the user equipment. Then, as shown in step S 902  in  FIG.  9 ( a ) , step S 901  in  FIG.  9 ( b )  and step S 902  in  FIG.  9 ( c ) , the electronic equipment  300  sends the uplink transmission power for the UE to the UE. 
     According to an embodiment of the present disclosure, the electronic equipment  300  may send the uplink transmission power information by resources different from those used by the satellite equipment currently accessed. The resources may include time resources and frequency resources. 
     As described above, after accessing the satellite equipment, the UE may acquire the uplink transmission power from the network side equipment. The UE may acquire the uplink transmission power from the network side equipment before each uplink transmission of the UE. In this way, the UE is not required to acquire the uplink transmission power from the satellite equipment, thereby avoiding time delay and power loss. Further, the network side equipment measures the uplink transmission power for the network side equipment as the uplink transmission power for the user equipment, thereby avoiding repeated measurement for multiple user equipments. 
     As described above, after accessing the satellite equipment, the UE may acquire, from the network side equipment, the TA, the uplink resource information and the uplink transmission power. Each of the TA, the uplink resource information and the uplink transmission power may be acquired before each uplink transmission of the UE. Further, the network side equipment may send the TA, the uplink resource information and the uplink transmission power to the UE in response to request information from the UE. Therefore, according to an embedment of the present disclosure, the UE may merge request information for requesting two or more of the TA, the uplink resource information and the uplink transmission power and send merged request information. The network side equipment may merge two or more of the TA, the uplink resource information and the uplink transmission power and send merged information to the UE, which is not limited in the present disclosure. For example, the UE may send a piece of request information that carries uplink transmission power request information, TA request information and BSR information to the network side equipment before each uplink transmission, then the network side equipment sends uplink transmission power, a TA and uplink resources to the UE. 
     According to an embodiment of the present disclosure, the control information may further include information related to a satellite equipment that the user equipment is to access, including a satellite equipment initially accessed by the user equipment. The configuring unit  320  may configure the control information including the satellite equipment initially accessed by the user equipment. 
     According to an embodiment of the present disclosure, the electronic equipment  300  may receive information related to a communication demand from the user equipment. Further, the electronic equipment  300  may send information on a satellite equipment that the user equipment is to access to the user equipment, in response to the received information related to the communication demand. 
     Here, the information related to the communication demand includes demand information related to uplink data transmission between the user equipment and the satellite equipment. For example, the information related to the communication demand may include information such as a total data size that the user equipment is required to send, a data transmission rate that the user equipment desires, transmission efficiency that the user equipment desires and energy efficiency that the user equipment desires. 
     According to an embodiment of the present disclosure, a determination result may be determined by the satellite equipment. That is, the electronic equipment  300  may send the information related to the communication demand received from the user equipment to one or more satellite equipments and receive the determination result from at least one of the one or more satellite equipments. Here the determination result may include, for example, that the satellite equipment allows to be accessed and that the satellite equipment does not allow to be accessed. Further, the electronic equipment  300  may determine, based on the determination result from at least one satellite equipment, a satellite equipment that the user equipment is to access, and send information on the satellite equipment to be accessed, for example, identity information of the satellite equipment to be accessed to the user equipment. Here, the electronic equipment  300 , for example, may select one satellite equipment from multiple satellite equipments that allow to be accessed indicated in the determination result, such that the configuring unit  320  may configure the control information including the identity information of the satellite equipment. In addition, the electronic equipment  300  may directly send the received determination result of all satellite equipments to the user equipment, and the user equipment selects a satellite equipment to be accessed. In this example, the configuring unit  320  may configure the control information including the determination result of all satellite equipments received by the electronic equipment  300 . 
     In addition, according to an embodiment of the present disclosure, a satellite equipment that receives the information related to the communication demand may also directly send a determination result of the satellite equipment to the user equipment without sending to the electronic equipment  300 . 
     According to an embodiment of the present disclosure, the determination result may also be determined by the electronic equipment  300 . As shown in  FIG.  3   , the electronic equipment  300  may further include a selecting unit  350  configured to select a satellite equipment that the user equipment is to access based on the information related to the communication demand. Further, according to an embodiment of the present disclosure, the selecting unit  350  may select a satellite equipment for the user equipment based on the information related to the communication demand, orbit information of multiple satellites and the like. Further, the electronic equipment  300  may send identity information of the selected satellite equipment to the user equipment. 
       FIG.  11 ( a )  to  FIG.  11 ( c )  each is a flowchart showing signaling for selecting a satellite equipment for a UE according to an embodiment of the present disclosure. 
     As shown in  FIG.  11 ( a ) , in step S 1101 , a UE sends information related to a communication demand to a network side equipment. Next, in step S 1102 , the network side equipment sends the information related to the communication demand to a satellite equipment. Next, in step S 1103 , a satellite equipment that receives the information related to the communication demand performs determination. Next, in step S 1104 , the satellite equipment sends a determination result to the UE. Next, in step S 1105 , the UE determines a satellite equipment to be accessed based on the received determination result. 
     As shown in  FIG.  11 ( b ) , in step S 1101 , a UE sends information related to a communication demand to a network side equipment. Next, in step S 1102 , the network side equipment sends the information related to the communication demand to a satellite equipment. Next, in step S 1103 , a satellite equipment that receives the information related to the communication demand performs determination. Next, in step S 1104 , the satellite equipment sends a determination result to the network side equipment. Next, in step S 1105 , the network side equipment sends a determination results from one or more satellite equipments to the UE. Next, in step S 1106 , the UE determines a satellite equipment to be accessed based on the determination result. Alternatively, in step S 1105 , the network side equipment determines a satellite equipment that the UE is to access based on the determination result from one or more satellite equipments. Next, in step S 1106 , the network side equipment sends identity information of the satellite equipment that the UE is to access to the UE. 
     As shown in  FIG.  11 ( c ) , in step S 1101 , a UE sends information related to a communication demand to a network side equipment. Next, in step S 1102 , the network side equipment selects a satellite equipment that the UE is to access. Next, in step S 1103 , the network side equipment sends identity information of the satellite equipment that the UE is to access to the UE. 
     As described above, the network side equipment may determine a satellite equipment that the UE is to access in an initial access process, that is, before the UE accesses a satellite equipment. In this way, the UE is not required to exchange information of determination result with all satellite equipments, thereby avoiding time delay and power loss. 
     According to an embodiment of the present disclosure, the control information may further include information related to the satellite equipment that the user equipment is to access, including a satellite equipment to which the user equipment is to switch. The configuring unit  320  may configure the control information including the satellite equipment to which the user equipment is to switch. 
     According to an embodiment of the present disclosure, the communicating unit  310  may send, to the user equipment, switching instruction information representing switching a satellite equipment currently accessed by the user equipment to another satellite equipment. 
     According to an embodiment of the present disclosure, the switching may be performed by the user equipment or the electronic equipment  300 . For example, in an embodiment in which the user equipment performs the switching, when determining that channel quality between the user equipment and the satellite equipment is poor, the user equipment may be determined to switch from the satellite equipment currently accessed to another satellite equipment. For another example, in an embodiment in which the electronic equipment  300  performs the switching, the electronic equipment  300  may determine, based on a distance between the user equipment and the satellite equipment currently accessed, that the user equipment is required to switch from the satellite equipment currently accessed to another satellite equipment. For example, in a case that the distance between the user equipment and the satellite equipment currently accessed is far, the electronic equipment  300  may determine that the user equipment is required to switch to another satellite equipment. 
     According to an embodiment of the present disclosure, the another satellite equipment to which the user equipment is to switch may be determined by the satellite equipment currently accessed by the user equipment or may be determined by the electronic equipment  300 . 
     According to an embodiment of the present disclosure, the communicating unit  310  may receive channel quality information between the user equipment and each of multiple satellite equipments from the user equipment. That is, the user equipment may calculate channel quality between the user equipment and each of the multiple satellite equipments around the user equipment and send the channel quality information to the electronic equipment  300 . 
     Further, in a case that the satellite equipment currently accessed by the user equipment determines a satellite equipment to which the user equipment is to switch, the electronic equipment  300  may send received channel quality information to the satellite equipment currently accessed by the user equipment, such that the satellite equipment selects, based on the channel quality information, a satellite equipment to which the user equipment is to switch. In this case, the communicating unit  310  may receive the switching instruction information from the satellite equipment currently accessed by the user equipment. The switching instruction information may include identity information of another satellite equipment to which it is required to switch. In addition, the satellite equipment currently accessed may further directly send the switching instruction information to the user equipment. 
     According to an embodiment of the present disclosure, the selecting unit  350  may further determine another satellite equipment to which the user equipment is to switch based on the channel quality information between the user equipment and each of the multiple satellite equipments. In this case, the configuring unit  350  may configure the control information including the switching instruction information, which includes the identity information of the another satellite equipment to which the user equipment is to switch. 
       FIG.  12 ( a )  to  FIG.  12 ( c )  each is a flowchart showing signaling for switching a satellite equipment for a UE according to an embodiment of the present disclosure. 
     As shown in  FIG.  12 ( a ) , in step S 1201 , a UE sends measured channel quality information between the user equipment and each of multiple satellite equipments to the network side equipment. Next, in step S 1202 , the network side equipment sends the channel quality information to a satellite equipment currently accessed by the user equipment. Next, in step S 1203 , the satellite equipment currently accessed by the user equipment selects a satellite equipment to which the user equipment is to switch. Next, in step S 1204 , the satellite equipment directly sends, to the UE, identity of the satellite equipment to which the user equipment is to switch. 
     As shown in  FIG.  12 ( b ) , in step S 1201 , a UE sends measured channel quality information between the UE and each of multiple satellite equipments to a network side equipment. Next, in step S 1202 , the network side equipment sends the channel quality information to a satellite equipment currently accessed by the user equipment. Next, in step S 1203 , the satellite equipment currently accessed by the user equipment selects a satellite equipment to which the user equipment is to switch. Next, in step S 1204 , the satellite equipment sends, to the network side equipment, identity of the satellite equipment to which the user equipment is to switch. Next, in step S 1205 , the network side equipment sends the identity information of the switched satellite equipment to the UE. 
     As shown in  FIG.  12 ( c ) , in step S 1201 , a UE sends measured channel quality information between the UE and each of multiple satellite equipments to a network side equipment. Next, in step S 1202 , the network side equipment selects a satellite equipment to which the UE is to switch. Next, in step S 1203 , the network side equipment sends, to the UE, identity information of the satellite equipment to which the user equipment is to switch. 
     According to an embodiment of the present disclosure, the electronic equipment  300  may send switching instruction information by resources different from those used by the satellite equipment currently accessed. The resources may include time resources and frequency resources. 
     As described above, when accessing a satellite equipment, the UE may determine a satellite equipment to which the user equipment is to switch via the network side equipment, thereby avoiding time delay and power loss. 
     It can be seen that, the electronic equipment  300  according to the embodiment of the present disclosure may configure control information related to data transmission between the user equipment and the satellite equipment and send the configured control information to the user equipment. The control information includes but is not limited to these kinds of control information described above. It should be noted that, the electronic equipment  300  may assist the user equipment in acquiring any control information related to data transmission between the user equipment and the satellite equipment, thereby preventing the user equipment from acquiring control information from the satellite equipment with large transmission power and large time delay. In addition, the electronic equipment  300  may assist multiple user equipments in acquiring the control information, thereby avoiding redundant acquisition. 
     3. Configuration Example for a User Equipment 
       FIG.  13    is a block diagram showing a structure of a user equipment  1300  in a wireless communication system according to an embodiment of the present disclosure. As shown in  FIG.  13   , the user equipment  1300  may include a communicating unit  1310  and a decoding unit  1320 . 
     Here, units of the user equipment  1300  may be included in processing circuitry. It should be noted that the user equipment  1300  may include one processing circuitry or multiple processing circuitry. Further, the processing circuitry may include various separate functional units to perform various functions and/or operations. It should be noted that these functional units may be physical entities or logical entities, and units with different names may be implemented by one physical entity. 
     According to an embodiment of the present disclosure, the user equipment  1300  may receive control information related to data transmission between the user equipment and the satellite equipment via the communicating unit  1310 . 
     According to an embodiment of the present disclosure, the decoding unit  1320  may decode received control information, such that the user equipment  1300  may perform data transmission with the satellite equipment based on the decoded control information. 
     Preferably, the control information includes a physical layer parameter related to data transmission between the user equipment and the satellite equipment. The physical layer parameter includes but is not limited to uplink transmission power for the user equipment, a Time Advance (TA) for the user equipment, a Modulation and Coding Scheme (MCS) for the user equipment and uplink resources for the user equipment. 
     Preferably, the control information may further include information related to a satellite equipment that the user equipment is to access, which includes but is not limited to a satellite equipment initially accessed by the user equipment and a satellite equipment to which the user equipment is to switch. 
     Here, the user equipment  1300  may receive the control information from the network side equipment, for example, the electronic equipment  300  as described above. Here the network side equipment may serve the user equipment  1300 . 
     According to an embodiment of the present disclosure, the user equipment  1300  may send a random access request message of desiring to access a satellite equipment to a network side equipment and receive a time advance between the user equipment and a satellite equipment that the user equipment is to access from the network side equipment. 
     According to an embodiment of the present disclosure, as shown in  FIG.  13   , the user equipment  1300  may further include a coding unit  1330  configured to select a proper random access code and code the random access code to generate a random access request message. Here, the coding unit  1330  may select a random access code representing that the user equipment desires to access a satellite equipment. According to an embodiment of the present disclosure, there may be multiple kinds of access codes at a side of the user equipment. Different kinds of access codes have different meanings. For example, there may be the random access code representing that the user equipment desires to access a satellite equipment and a random access code representing that the user equipment desires to access a base station equipment at the side of the user equipment. In addition, the random access code representing that the user equipment desires to access a base station equipment may include a random access code representing that the user equipment is located at an edge of a cell, a random access code representing that the user equipment is located at a center of a cell and the like. The network side equipment may determine whether the user equipment  1300  desires to access the satellite equipment or the network side equipment by decoding the random access code. 
     According to an embodiment of the present disclosure, the user equipment  1300  may receive the time advance by a random access response message. 
     According to an embodiment of the present disclosure, the user equipment  1300  may receive an updated time advance from the network side equipment before each uplink transmission of the user equipment  1300  or when the user equipment  1300  is in a desynchronizing state. 
     According to an embodiment of the present disclosure, the user equipment  1300  may send information related to a communication demand to the network side equipment and receive information on a satellite equipment that the user equipment is to access from the network side equipment or the satellite equipment that the user equipment  1300  is to access. 
     According to an embodiment of the present disclosure, the user equipment  1300  may receive switching instruction information representing switching a satellite equipment currently accessed to another satellite equipment from the network side equipment or the satellite equipment that the user equipment  1300  is to access. 
     According to an embodiment of the present disclosure, as shown in  FIG.  13   , the user equipment  1300  may further include a measuring unit  1340  configured to measure channel quality information between the user equipment and the satellite equipment. Further, the user equipment  1300  may send channel quality information between the user equipment and each of multiple satellite equipments to the network side equipment, such that the network side equipment or the satellite equipment currently accessed determines another satellite equipment to which the user equipment is to switch according to the channel quality information between the user equipment  1300  and each of the multiple satellite equipments. 
     According to an embodiment of the present disclosure, the user equipment  1300  may send buffer status report information to the network side equipment and receive uplink resource information for the user equipment from the network side equipment or a satellite equipment currently accessed by the user equipment. 
     According to an embodiment of the present disclosure, the user equipment  1300  may receive uplink transmission power information from the network side equipment before each uplink transmission of the user equipment  1300 . 
     According to an embodiment of the present disclosure, the user equipment  1300  may send uplink transmission power request information to the network side equipment, such that the network side equipment determines uplink transmission power for the user equipment  1300  in response to the power request information. 
     The electronic equipment  300  according to the embodiment of the present disclosure may serve as a network side equipment. That is, the electronic equipment  300  may serve the user equipment  1300 . Therefore, all embodiments of the electronic equipment  300  described above are applicable to the user equipment  1300 . 
     4. Method Embodiment 
     Next, a wireless communication method performed by an electronic equipment  300  serving as a network side equipment in a wireless communication system according to an embodiment of the present disclosure is described in detail. 
       FIG.  14    is a flowchart of the wireless communication method performed by the electronic equipment  300  serving as a network side equipment in a wireless communication system according to an embodiment of the present disclosure. 
     As shown in  FIG.  14   , in step S 1410 , control information related to data transmission between a user equipment and a satellite equipment is configured. 
     Next, in step S 1420 , the control information is sent to the user equipment. 
     Preferably, the control information includes a physical layer parameter related to data transmission between the user equipment and the satellite equipment. The physical layer parameter includes but is not limited to uplink transmission power for the user equipment, a time advance for the user equipment, a modulation and coding scheme for the user equipment and uplink resources for the user equipment. 
     Preferably, the control information may further include information related to a satellite equipment that the user equipment is to access, which includes but is not limited to a satellite equipment initially accessed by the user equipment and a satellite equipment to which the user equipment is to switch. 
     Preferably, the wireless communication method further includes: receiving a random access request message of desiring to access a satellite equipment from a user equipment; and sending a time advance between the user equipment and a satellite equipment to be accessed to the user equipment, in response to the random access request message. 
     Preferably, the random access request message includes a random access code representing that the user equipment desires to access a satellite equipment. 
     Preferably, the wireless communication method further includes: using the time advance between the electronic equipment and the satellite equipment to be accessed as a time advance between the user equipment and the satellite equipment to be accessed. 
     Preferably, the wireless communication method further includes: receiving a time advance between the electronic equipment and the satellite equipment to be accessed from the satellite equipment to be accessed. 
     Preferably, the wireless communication method further includes: calculating, according to a position of the satellite equipment to be accessed or current time information, the time advance between the electronic equipment and the satellite equipment to be accessed. 
     Preferably, the sending a time advance between the user equipment and a satellite equipment to be accessed to the user equipment includes: sending the time advance by a random access response message. 
     Preferably, the wireless communication method further includes: sending an updated time advance to the user equipment, before each uplink transmission of the user equipment or when the user equipment is in a desynchronizing state. 
     Preferably, the sending a time advance between the user equipment and a satellite equipment to be accessed to the user equipment includes: sending the time advance by resources different from those used by the satellite equipment to be accessed. 
     Preferably, the sending a time advance between the user equipment and a satellite equipment to be accessed to the user equipment includes: sending the time advance by time resources different from those used by the satellite equipment to be accessed or by frequency resources different from those used by the satellite equipment to be accessed. 
     Preferably, the wireless communication method further includes: receiving information related to a communication demand from the user equipment; and sending information on a satellite equipment that the user equipment is to access to the user equipment, in response to the received information related to the communication demand. 
     Preferably, the wireless communication method further includes: selecting a satellite equipment that the user equipment is to access according to the information related to a communication demand. 
     Preferably, the wireless communication method further includes: sending, to the user equipment, switching instruction information representing switching a satellite equipment currently accessed by the user equipment to another satellite equipment. 
     Preferably, the wireless communication method further includes: determining, according to a distance between the user equipment and the satellite equipment currently accessed, that the user equipment switches from the satellite equipment currently accessed to another satellite equipment. 
     Preferably, the wireless communication method further includes: receiving the switching instruction information from the satellite equipment currently accessed. 
     Preferably, the wireless communication method further includes: receiving, from the user equipment, channel quality information between the user equipment and each of multiple satellite equipments; and determining, according to the channel quality information between the user equipment and each of the multiple satellite equipments, another satellite equipment to which the user equipment is to switch. 
     Preferably, the wireless communication method further includes: receiving buffer status report information from the user equipment and sending the buffer status report information to a satellite equipment currently accessed by the user equipment; and receiving uplink resource information for the user equipment from the satellite equipment currently accessed by the user equipment and sending the uplink resource information to the user equipment. 
     Preferably, the wireless communication method further includes: merging buffer status report information from multiple user equipments that currently access one satellite equipment and sending the merged information to the satellite equipment currently accessed. 
     Preferably, the wireless communication method further includes: receiving, from the satellite equipment currently accessed by the user equipment, merged uplink resource information for multiple user equipments; and determining, according to the merged uplink resource information, uplink resource information for each of the multiple user equipments. 
     Preferably, the sending the uplink resource information to the user equipment includes: sending the uplink resource information by resources different from those used by the satellite equipment currently accessed. 
     Preferably, the sending the uplink resource information to the user equipment includes: sending the uplink resource information by time resources different from those used by the satellite equipment currently accessed or by frequency resources different from those used by the satellite equipment currently accessed. 
     Preferably, the wireless communication method further includes: sending uplink transmission power information to the user equipment before each uplink transmission of the user equipment. 
     Preferably, the wireless communication method further includes: receiving uplink transmission power request information from the user equipment. 
     Preferably, the wireless communication method further includes: using uplink transmission power information for uplink transmission between the electronic equipment and the satellite equipment currently accessed by the user equipment, as the uplink transmission power information for the user equipment. 
     Preferably, the wireless communication method further includes: receiving, from the satellite equipment currently accessed, the uplink transmission power information for the electronic equipment. 
     Preferably, the wireless communication method further includes: calculating, according to a position of the satellite equipment currently accessed or current time information, uplink transmission power information for the electronic equipment. 
     Preferably, the sending uplink transmission power information to the user equipment includes: sending the uplink transmission power information by resources different from those used by the satellite equipment currently accessed. 
     Preferably, the sending uplink transmission power information to the user equipment includes: sending the uplink transmission power information by time resources different from those used by the satellite equipment currently accessed or by frequency resources different from those used by the satellite equipment currently accessed. 
     According to an embodiment of the present disclosure, the above method may be performed by the electronic equipment  300  according to the embodiment of the present disclosure. Therefore, all embodiments of the electronic equipment  300  described above are applicable to this method. 
     Next, a wireless communication method performed by a user equipment  1300  in a wireless communication system according to an embodiment of the present disclosure is described in detail. 
       FIG.  15    is a flowchart of a wireless communication method performed by the user equipment  1300  in a wireless communication system according to an embodiment of the present disclosure. 
     As shown in  FIG.  15   , in step S 1510 , control information of data transmission between a user equipment and a satellite equipment is received. 
     Next, in step S 1520 , the received control information is demodulated so as to perform data transmission between the user equipment and the satellite equipment based on the control information. 
     Preferably, the wireless communication method further includes: sending, to a network side equipment, a random access request message of desiring to access a satellite equipment; and receiving, from the network side equipment, a time advance between the user equipment and a satellite equipment that the user equipment is to access. 
     Preferably, the random access request message includes a random access code representing that the user equipment desires to access a satellite equipment. 
     Preferably, the receiving, from the network side equipment, a time advance includes: receiving the time advance by a random access response message. 
     Preferably, the wireless communication method further includes: receiving an updated time advance from the network side equipment, before each uplink transmission of the user equipment or when the user equipment is in a desynchronizing state. 
     Preferably, the wireless communication method further includes: sending, to the network side equipment, information related to a communication demand; and receiving, from the network side equipment or a satellite equipment that the user equipment is to access, information on the satellite equipment that the user equipment is to access. 
     Preferably, the wireless communication method further includes: receiving, from the network side equipment or a satellite equipment currently accessed by the user equipment, switching instruction information representing switching the satellite equipment currently accessed to another satellite equipment. 
     Preferably, the wireless communication method further includes: sending channel quality information between the user equipment and each of multiple satellite equipments to the network side equipment, such that the network side equipment or the satellite equipment currently accessed determines another satellite equipment to which the user equipment is to switch according to the channel quality information between the user equipment and each of the multiple satellite equipment. 
     Preferably, the wireless communication method further includes: sending buffer status report information to the network side equipment and receiving uplink resource information for the user equipment from the network side equipment or a satellite equipment currently accessed by the user equipment. 
     Preferably, the wireless communication method further includes: receiving uplink transmission power information from the network side equipment before each uplink transmission of the user equipment. 
     Preferably, the wireless communication method further includes: sending uplink transmission power request information to the network side equipment. 
     According to an embodiment of the present disclosure, the above method may be performed by the user equipment  1300  according to the embodiment of the present disclosure. Therefore, all embodiments of the user equipment  1300  described above are applicable to this method. 
     5. Application Example 
     The technology according to the present disclosure may be applicable to various productions. 
     The network side equipment according to the present disclosure may be a network side equipment having a function of transmitting and receiving on the ground. For example, the network side equipment may be a transceiver on the ground. In this case, the network side equipment may be a transmitting-receiving equipment specifically for assisting the UE in acquiring control information related to data communications between the UE and the satellite equipment. That is, multiple transmitting-receiving equipments may be arranged on the ground based on geographic positions. Each of the multiple transmitting-receiving equipments may assist a UE in a certain range around the transmitting-receiving equipment in acquiring control information related to data communications between the UE and the satellite equipment. In addition, the network side equipment may also be, for example, a TRP or a base station equipment. The TRP may have a function of transmitting and receiving. For example, the TRP may receive information from a user equipment and a base station equipment and may further send information to a user equipment and a base station equipment. In an example, the TRP may serve a user equipment and may be controlled by a base station equipment. That is, the base station equipment serves the user equipment via the TRP. The base station equipment, for example, may be an eNB or a gNB (a base station in a fifth generation communication system). Further, the network side equipment may have a structure similar to that of a base station equipment described below or only have a structure related to information sending and receiving in the base station equipment. 
     The network side equipment may be implemented as any types of base station equipment, such as a macro eNB and a small eNB. The network side equipment may further be implemented as any types of gNB (a base station in a 5G system). The small eNB may be an eNB of a cell having a smaller coverage than a macro cell, such as a pico eNB, a micro eNB and a home (femto) eNB. Alternatively, the base station may be implemented as any other types of base stations, such as a NodeB and a base transceiver station (BTS). The base station may include: a main body (also referred to as a base station equipment) configured to control the wireless communication; and one or more remote radio heads (RRH) arranged at a different position from the main body. 
     The user equipment may be implemented as a mobile terminal (such as a smartphone, a tablet personal computer (PC), a notebook PC, a portable game terminal, a portable/dongle mobile router and a digital camera) or a vehicle terminal (such as a vehicle navigation equipment). The user equipment may further be implemented as a terminal performing machine to machine (M2M) communications (which is also referred to as a machine type communication (MTC) terminal). In addition, the user equipment may further be a wireless communication module (such as an integrated circuitry module including one wafer) mounted on each of the above terminals. 
     Application Example for a Base Station 
     First Application Example 
       FIG.  16    is a block diagram showing a first example of exemplary configuration of an eNB to which technology according to the present disclosure may be applied. An eNB  1600  includes one or more antennas  1610  and a base station equipment  1620 . Each of the antennas  1610  is connected to the base station equipment  1620  via a radio frequency (RF) cable. 
     Each of the antennas  1610  includes a single antenna element or multiple antenna elements (such as multiple antenna elements included in a multiple-input multiple-output (MIMO) antenna), and is used for the base station equipment  1620  to send and receive a wireless signal. The eNB  1600  may include multiple antennas  1610 , as shown in  FIG.  16   . For example, the multiple antennas  1610  may be compatible with multiple frequency bands used by the eNB  1600 . Although  FIG.  16    shows an example in which the eNB  1600  includes the multiple antennas  1610 , the eNB  1600  may also include a single antenna  1610 . 
     The base station equipment  1620  includes a controller  1621 , a memory  1622 , a network interface  1623  and a wireless communication interface  1625 . 
     The controller  1621  may be, for example, a CPU or a DSP, and operate various functions of a high layer of the base station equipment  1620 . For example, the controller  1621  generates a data packet based on data in a signal processed by the wireless communication interface  1625  and sends the generated packet via the network interface  1623 . The controller  1621  may bundle data from multiple baseband processors to generate a bundled packet and send the generated bundled packet. The controller  1621  may have a logic function that performs control such as wireless resource control, wireless bearer control, mobility management, admission control, and scheduling. The control may be performed in combination with a nearby eNB or core network node. The memory  1622  includes an RAM and an ROM, and stores a program executed by the controller  1621  and various types of control data (such as a terminal list, transmission power data and scheduling data). 
     The network interface  1623  is a communication interface via which the base station equipment  1620  is connected to a core network  1624 . The controller  1621  may communicate with a core network node or another eNB via the network interface  1623 . In this case, the eNB  1600  may be connected to the core network node or another eNB via a logical interface (such as an interface S1 and an interface X2). The network interface  1623  may also be a wired communication interface or a wireless communication interface for wireless backhaul line. If the network interface  1623  is the wireless communication interface, the network interface  1623  may use a frequency band for wireless communication higher than a frequency band used by the wireless communication interface  1625 . 
     The wireless communication interface  1625  supports any cellular communication scheme (such as long term evolution (LTE) and LTE-Advanced), and provides wireless connection to a terminal positioned in a cell of the eNB  1600  via an antenna  1610 . The wireless communication interface  1625  may include, for example, a (base band) BB processor  1626  and RF circuitry  1627 . The BB processor  1626  may perform, for example, encoding/decoding, modulating/demodulating and multiplexing/de-multiplexing, and various types of signal processing of layers (such as L1, medium access control (MAC), radio link control (RLC) and packet data convergence protocol (PDCP)). Instead of the controller  1621 , the BB processor  1626  may have a part or all of the above logic functions. The BB processor  1626  may be implemented as a memory storing a communication control program, or a module including a processor configured to execute a program and related circuitry. The function of the BB processor  1626  may be changed by updating the program. The module may be a card or blade inserted into a slot of the base station equipment  1620 . Alternatively, the module may be a chip mounted on the card or the blade. Further, the RF circuitry  1627  may include, for example, a mixer, a filter or an amplifier, and sends and receives a wireless signal via the antenna  1610 . 
     As shown in  FIG.  16   , the wireless communication interface  1625  may include multiple BB processors  1626 . For example, the multiple BB processors  1626  may be compatible with multiple frequency bands used by the eNB  1600 . As shown in  FIG.  16   , the wireless communication interface  1625  may include multiple RF circuitry  1627 . For example, the multiple RF circuitry  1627  may be compatible with multiple antenna elements. Although  FIG.  16    shows an example in which the wireless communication interface  1625  includes multiple BB processors  1626  and multiple RF circuitry  1627 , the wireless communication interface  1625  may include a single BB processor  1626  or single RF circuitry  1627 . 
     Second Application Example 
       FIG.  17    is a block diagram showing a second example of the exemplary configuration of an eNB to which the technology of the present disclosure may be applied. An eNB  1730  includes one or more antennas  1740 , a base station equipment  1750  and an RRH  1760 . The RRH  1760  may be connected to each of the antennas  1740  via an RF cable. The base station equipment  1750  may be connected to the RRH  1760  via a high speed line such as an optical fiber cable. 
     Each of the antennas  1740  includes a single antenna element or multiple antenna elements (such as multiple antenna elements included in a MIMO antenna), and is used for the RRH  1760  to send and receive a wireless signal. As shown in  FIG.  17   , the eNB  1730  may include multiple antennas  1740 . For example, the multiple antennas  1740  may be compatible with multiple frequency bands used by the eNB  1730 . Although  FIG.  17    shows an example in which the eNB  1730  includes the multiple antennas  1740 , the eNB  1730  may also include a single antenna  1740 . 
     The base station equipment  1750  includes a controller  1751 , a memory  1752 , a network interface  1753 , a wireless communication interface  1755 , and a connection interface  1757 . The controller  1751 , the memory  1752 , and the network interface  1753  are respectively the same as the controller  1621 , the memory  1622 , and the network interface  1623  described with reference to  FIG.  16   . 
     The wireless communication interface  1755  supports any cellular communication schemes (such as LTE and LTE-advanced), and provides wireless communication with a terminal located in a sector corresponding to the RRH  1760  via the RRH  1760  and the antenna  1740 . The wireless communication interface  1755  may generally include, for example, a BB processor  1756 . Except for the BB processor  1756  being connected to RF circuitry  1764  of the RRH  1760  via the connection interface  1757 , the BB processor  1756  is the same as the BB processor  1626  described with reference to  FIG.  16   . The wireless communication interface  1755  may include multiple BB processors  1756 , as shown in  FIG.  17   . For example, the multiple BB processors  1756  may be compatible with multiple frequency bands used by the eNB  1730 . Although  FIG.  17    shows an example in which the wireless communication interface  1755  includes multiple BB processors  1756 , the wireless communication interface  1755  may also include a single BB processor  1756 . 
     The connection interface  1757  is an interface for connecting the base station equipment  1750  (the wireless communication interface  1755 ) to the RRH  1760 . The connection interface  1757  may also be a communication module for communication in the above high speed line that connects the base station equipment  1750  (the wireless communication interface  1755 ) to the RRH  1760 . 
     The RRH  1760  includes a connection interface  1761  and a wireless communication interface  1763 . 
     The connection interface  1761  is an interface for connecting the RRH  1760  (the wireless communication interface  1763 ) to the base station equipment  1750 . The connection interface  1761  may also be a communication module for communication in the above-described high speed line. 
     The wireless communication interface  1763  sends and receives a wireless signal via the antenna  1740 . The wireless communication interface  1763  may generally include, for example, the RF circuitry  1764 . The RF circuitry  1764  may include, for example, a mixer, a filter, and an amplifier, and sends and receives a wireless signal via the antenna  1740 . The wireless communication interface  1763  may include multiple RF circuitry  1764 , as shown in  FIG.  17   . For example, the multiple RF circuitry  1764  may support multiple antenna elements. Although  FIG.  17    shows an example in which the wireless communication interface  1763  includes the multiple RF circuitry  1764 , the wireless communication interface  1763  may also include single RF circuitry  1764 . 
     In the eNB  1600  and the eNB  1730  respectively shown in  FIG.  16    and  FIG.  17   , the configuring unit  320 , the decoding unit  330 , the storing unit  340  and the selecting unit  350  shown in  FIG.  3    may be implemented by the controller  1621  and/or the controller  1751 . At least a part of functions may also be implemented by the controller  1621  and the controller  1751 . For example, the controller  1621  and/or the controller  1751  may configure control information, decode the random access code and select the satellite equipment by executing instructions stored in a corresponding memory. 
     Application Example for a Terminal Equipment 
     First Application Example 
       FIG.  18    is a block diagram showing an exemplary configuration of a smartphone  1800  to which technology according to the present disclosure may be applied. The smartphone  1800  includes a processor  1801 , a memory  1802 , a storage apparatus  1803 , an external connection interface  1804 , a camera  1806 , a sensor  1807 , a microphone  1808 , an input apparatus  1809 , a display apparatus  1810 , a loudspeaker  1811 , a wireless communication interface  1812 , one or more antenna switches  1815 , one or more antennas  1816 , a bus  1817 , a battery  1818  and an auxiliary controller  1819 . 
     The processor  1801  may be, for example, a CPU or a system on chip (SoC), and controls functions of an application layer and another layer of the smartphone  1800 . The memory  1802  includes an RAM and an ROM, and stores data and a program executed by the processor  1801 . The storage apparatus  1803  may include a storage medium such as a semiconductor memory and a hard disk. The external connection interface  1804  is an interface for connecting an external apparatus (such as a memory card and a universal serial bus (USB) apparatus) to the smartphone  1800 . 
     The camera  1806  includes an image sensor (such as a charge coupled device (CCD) and a complementary metal oxide semiconductor (CMOS)), and generates a captured image. The sensor  1807  may include a group of sensors such as a measurement sensor, a gyro sensor, a geomagnetic sensor, and an acceleration sensor. The microphone  1808  converts sound inputted to the smartphone  1800  into an audio signal. The input apparatus  1809  includes, for example, a touch sensor configured to detect a touch on a screen of the display apparatus  1810 , a keypad, a keyboard, a button, or a switch, and receives an operation or information inputted from a user. The display apparatus  1810  includes a screen (such as a liquid crystal display (LCD) and an organic light-emitting diode (OLED) display), and displays an output image of the smartphone  1800 . The loudspeaker  1811  is configured to convert an audio signal outputted from the smartphone  1800  into sound. 
     The wireless communication interface  1812  supports any cellular communication scheme (such as LTE and LTE-Advanced), and performs wireless communications. The wireless communication interface  1812  may include, for example, a BB processor  1813  and RF circuitry  1814 . The BB processor  1813  may perform, for example, coding/decoding, modulating/demodulating and multiplexing/de-multiplexing, and perform various types of signal processing for wireless communications. The RF circuitry  1814  may include, for example, a mixer, a filter and an amplifier, and sends and receives a wireless signal via an antenna  1816 . The wireless communication interface  1812  may be a chip module having the BB processor  1813  and the RF circuitry  1814  integrated thereon. As shown in  FIG.  18   , the wireless communication interface  1812  may include multiple BB processors  1813  and multiple RF circuitry  1814 . Although  FIG.  18    shows an example in which the wireless communication interface  1812  includes the multiple BB processors  1813  and the multiple RF circuitry  1814 , the wireless communication interface  1812  may include a single BB processor  1813  or single RF circuitry  1814 . 
     Besides the cellular communication scheme, the wireless communication interface  1812  may support an additional type of wireless communication scheme, such as a short-distance wireless communication scheme, a near field communication scheme and a wireless local area network (LAN) scheme. In this case, the wireless communication interface  1812  may include the BB processor  1813  and the RF circuitry  1814  for each wireless communication scheme. 
     Each of the antenna switches  1815  switches a connection destination of the antenna  1816  among multiple circuitry (such as circuitry for different wireless communication schemes) included in the wireless communication interface  1812 . 
     Each of the antennas  1816  includes a single antenna element or multiple antenna elements (such as multiple antenna elements included in an MIMO antenna), and is used for the wireless communication interface  1812  to send and receive a wireless signal. The smartphone  1800  may include multiple antennas  1816 , as shown in  FIG.  18   . Although  FIG.  18    shows an example in which the smartphone  1800  includes the multiple antennas  1816 , the smartphone  1800  may also include a single antenna  1816 . 
     In addition, the smartphone  1800  may include an antenna  1816  for each type of wireless communication scheme. In this case, the antenna switches  1815  may be omitted from the configuration of the smartphone  1800 . 
     The processor  1801 , the memory  1802 , the storage apparatus  1803 , the external connection interface  1804 , the camera  1806 , the sensor  1807 , the microphone  1808 , the input apparatus  1809 , the display apparatus  1810 , the loudspeaker  1811 , the wireless communication interface  1812 , and the auxiliary controller  1819  are connected to each other via the bus  1817 . The battery  1818  supplies power to blocks of the smartphone  1800  shown in  FIG.  18    via feeders that are partially shown with dashed lines in the drawings. The auxiliary controller  1819 , for example, operates a minimum necessary function of the smartphone  1800  in a sleep mode. 
     In the smartphone  1800  shown in  FIG.  18   , the decoding unit  1320 , the coding unit  1330  and the measuring unit  1340  shown in  FIG.  13    may be implemented by the processor  1801  or the auxiliary controller  1819 . At least a part of functions may also be implemented by the processor  1801  or the auxiliary controller  1819 . For example, the processor  1801  or the auxiliary controller  1819  may decode downlink information, code the random access code and calculate the channel quality by executing instructions stored in the memory  1802  or the storage apparatus  1803 . 
     Second Application Example 
       FIG.  19    is a block diagram showing an example of schematic configuration of a vehicle navigation equipment  1920  to which the technology according to the present disclosure may be applied. The vehicle navigation equipment  1920  includes a processor  1921 , a memory  1922 , a global positioning system (GPS) module  1924 , a sensor  1925 , a data interface  1926 , a content player  1927 , a storage medium interface  1928 , an input apparatus  1929 , a display apparatus  1930 , a loudspeaker  1931 , a wireless communication interface  1933 , one or more antenna switches  1936 , one or more antennas  1937 , and a battery  1938 . 
     The processor  1921  may be, for example, a CPU or a SoC, and controls a navigation function and another function of the vehicle navigation equipment  1920 . The memory  1922  includes an RAM and an ROM, and stores a program executed by the processor  1921 , and data. 
     The GPS module  1924  uses a GPS signal received from a GPS satellite to calculate a position (such as a latitude, a longitude, and an altitude) of the vehicle navigation equipment  1920 . The sensor  1925  may include a group of sensors such as a gyro sensor, a geomagnetic sensor, and an air pressure sensor. The data interface  1926  is connected to, for example, a vehicle network  1941  via a terminal that is not shown, and acquires data (such as vehicle speed data) generated by the vehicle. 
     The content player  1927  reproduces content stored in a storage medium (such as a CD and a DVD) inserted into the storage medium interface  1928 . The input apparatus  1929  includes, for example, a touch sensor configured to detect a touch on a screen of the display apparatus  1930 , a button, or a switch, and receives an operation or information inputted by a user. The display apparatus  1930  includes a screen such as a LCD or an OLED display, and displays an image of the navigation function or reproduced content. The loudspeaker  1931  outputs sound of the navigation function or the reproduced content. 
     The wireless communication interface  1933  supports any cellular communication scheme (such as LTE and LTE-Advanced), and performs wireless communications. The wireless communication interface  1933  may generally include, for example, a BB processor  1934  and RF circuitry  1935 . The BB processor  1934  may perform, for example, encoding/decoding, modulating/demodulating, and multiplexing/de-multiplexing, and performs various types of signal processing for wireless communications. In addition, the RF circuitry  1935  may include, for example, a mixer, a filter, and an amplifier, and sends and receives a wireless signal via the antenna  1937 . The wireless communication interface  1933  may also be a chip module having the BB processor  1934  and the RF circuitry  1935  integrated thereon. The wireless communication interface  1933  may include multiple BB processors  1934  and multiple RF circuitry  1935 , as shown in  FIG.  19   . Although  FIG.  19    shows an example in which the wireless communication interface  1933  includes the multiple BB processors  1934  and the multiple RF circuitry  1935 , the wireless communication interface  1933  may include a single BB processor  1934  or single RF circuitry  1935 . 
     In addition to a cellular communication scheme, the wireless communication interface  1933  may support another type of wireless communication scheme such as a short-distance wireless communication scheme, a near field communication scheme, and a wireless LAN scheme. In that case, the wireless communication interface  1933  may include a BB processor  1934  and RF circuitry  1935  for each wireless communication scheme. 
     Each of the antenna switches  1936  switches a connection destination of the antenna  1937  among multiple circuitry (such as circuitry for different wireless communication schemes) included in the wireless communication interface  1933 . 
     Each of the antennas  1937  includes a single antenna element or multiple antenna elements (such as multiple antenna elements included in an MIMO antenna), and is used for the wireless communication interface  1933  to send and receive a wireless signal. The vehicle navigation equipment  1920  may include multiple antennas  1937 , as shown in  FIG.  19   . Although  FIG.  19    shows an example in which the vehicle navigation equipment  1920  includes the multiple antennas  1937 , the vehicle navigation equipment  1920  may include a single antenna  1937 . 
     Furthermore, the vehicle navigation equipment  1920  may include an antenna  1937  for each wireless communication scheme. In that case, the antenna switches  1936  may be omitted from the configuration of the vehicle navigation equipment  1920 . 
     The battery  1938  supplies power to blocks of the vehicle navigation equipment  1920  shown in  FIG.  19    via feeders that are partially shown as dashed lines in  FIG.  19   . The battery  1938  accumulates power supplied from the vehicle. 
     In the vehicle navigation equipment  1920  shown in  FIG.  19   , the decoding unit  1320 , the coding unit  1330  and the measuring unit  1340  shown in  FIG.  13    may be implemented by the processor  1921 . At least a part of the functions may also be implemented by the processor  1921 . For example, the processor  1921  may decode the downlink information, code the random access code and calculate the channel quality by executing instructions stored in the memory  1922 . 
     The technology of the present disclosure may also be implemented as a vehicle system (or a vehicle)  1940  including one or more blocks in the vehicle navigation equipment  1920 , the vehicle network  1941 , and a vehicle module  1942 . The vehicle module  1942  generates vehicle data (such as a vehicle speed, an engine speed, and fault information), and outputs the generated data to the vehicle network  1941 . 
     Preferred embodiments of the present disclosure are described above with reference to the drawings. However, the present disclosure is not limited to the above examples. Those skilled in the art may obtain various modifications and changes within the scope of the appended claims. It should understand that these modifications and changes fall within the technical scope of the present disclosure. 
     For example, a unit shown with a dashed-line block in functional block diagrams shown in the drawings is optional in a corresponding equipment. Further, optional functional units may be combined in a suitable manner to achieve required functions. 
     For example, in the above embodiments, multiple functions included in one unit may be achieved by separate apparatuses. Alternately, in the above embodiments, multiple functions achieved by multiple units may be achieved by separate apparatuses. In addition, one of the above functions may be achieved by multiple units. These configurations should be included in the technical scope of the present disclosure. 
     In this specification, the steps described in the flowcharts include not only processing performed in time series in the described order but also processing performed in parallel or individually instead of in time series. In addition, the steps performed in time series may be performed in a different order. 
     Although the embodiments of the present disclosure are described above in detail with reference to the drawings, it should be understood that the above-described embodiments are merely used for illustrating the present disclosure rather than intended to limit the present disclosure. Those skilled in the art can make various modifications and variations to the above-described embodiments without departing from the substance and scope of the present disclosure. Therefore, the scope of the present disclosure is defined only by the appended claims and their equivalents.