Patent Publication Number: US-2023163880-A1

Title: Methods, devices, and medium for communication

Description:
TECHNICAL FIELD 
     Embodiments of the present disclosure generally relate to the field of telecommunication, and in particular, to methods, devices, and medium for communication. 
     BACKGROUND 
     Generally, a power level at a terminal device may be not high. On one hand, low power can reduce cost of equipment, on the other hand low power means lower uplink coverage. In some embodiments, the terminal device may perform retransmission via radio resource control (RRC) signaling to address coverage issues. However, retransmission during an access procedure still needs to be discussed. 
     SUMMARY 
     In general, example embodiments of the present disclosure provide a solution of repetition of transmission during an access procedure. 
     In a first aspect, there is provided a method for communication. The method comprises receiving, at a terminal device and from a network device, information indicating at least one resource allocated for a repetition of transmission during an access procedure. The method further comprises in accordance with a determination that the repetition of transmission is applicable during the access procedure, determining a target resource based at least in part on the information. The method also comprises transmitting an access request for the access procedure on the target resource. 
     In a second aspect, there is provided a method for communication. The method comprises transmitting, at a network device and to a terminal device, information indicating at least one resource allocated for a repetition of transmission during an access procedure. The method also comprises receiving an access request from the terminal device on a target resource determined based at least in part on the information. 
     In a third aspect, there is provided a terminal device. The terminal device comprises a processing unit; and a memory coupled to the processing unit and storing instructions thereon, the instructions, when executed by the processing unit, causing the terminal device to perform receiving from a network device, information indicating at least one resource allocated for a repetition of transmission during an access procedure; in accordance with a determination that the repetition of transmission is applicable during the access procedure, determining a target resource based at least in part on the information; and transmitting an access request for the access procedure on the target resource. 
     In a fourth aspect, there is provided a network device. The network device comprises a processing unit; and a memory coupled to the processing unit and storing instructions thereon, the instructions, when executed by the processing unit, causing the network device to perform transmitting, to a terminal device, information indicating at least one resource allocated for a repetition of transmission during an access procedure; and receiving an access request from the terminal device on a target resource determined based at least in part on the information. 
     In a fifth aspect, there is provided a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to carry out the method according to any one of the first aspect or second aspect. 
     Other features of the present disclosure will become easily comprehensible through the following description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Through the more detailed description of some example embodiments of the present disclosure in the accompanying drawings, the above and other objects, features and advantages of the present disclosure will become more apparent, wherein: 
         FIG.  1    is a schematic diagram of a communication environment in which embodiments of the present disclosure can be implemented; 
         FIG.  2    is a signaling chart illustrating a process according to an embodiment of the present disclosure; 
         FIG.  3    is a flowchart of an example method in accordance with an embodiment of the present disclosure: 
         FIG.  4    is a flowchart of an example method in accordance with an embodiment of the present disclosure; and 
         FIG.  5    is a simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure. 
     
    
    
     Throughout the drawings, the same or similar reference numerals represent the same or similar element. 
     DETAILED DESCRIPTION 
     Principle of the present disclosure will now be described with reference to some example embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitations as to the scope of the disclosure. The disclosure described herein can be implemented in various manners other than the ones described below. 
     In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs. 
     As used herein, the term “network device” refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate. Examples of a network device include, but not limited to, a Node B (NodeB or NB), an Evolved NodeB (eNodeB or eNB), a NodeB in new radio access (gNB) a Remote Radio Unit (RRU), a radio head (RH), a remote radio head (RRH), a low power node such as a femto node, a pico node, a satellite network device, an aircraft network device, and the like. For the purpose of discussion, in the following, some example embodiments will be described with reference to eNB as examples of the network device. 
     As used herein, the term “terminal device” refers to any device having wireless or wired communication capabilities. Examples of the terminal device include, but not limited to, user equipment (UE), personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs), portable computers, tablets, wearable devices, internet of things (IoT) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, device on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure/network, or image capture devices such as digital cameras, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like. In the following description, the terms “terminal device”, “communication device”, “terminal”, “user equipment” and “UE” may be used interchangeably. 
     Communications discussed herein may use conform to any suitable standards including, but not limited to, New Radio Access (NR), Long Term Evolution (LTE), LTE-Evolution, LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), cdma2000, and Global System for Mobile Communications (GSM) and the like. Furthermore, the communications may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the first generation (1G), the second generation (2G), 2.5G, 2.85G, the third generation (3G), the fourth generation (4G), 4.5G, the fifth generation (5G) communication protocols. The techniques described herein may be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies. 
     As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term “includes” and its variants are to be read as open terms that mean “includes, but is not limited to.” The term “based on” is to be read as “based at least in part on.” The term “one embodiment” and “an embodiment” are to be read as “at least one embodiment.” The term “another embodiment” is to be read as “at least one other embodiment.” The terms “first,” “second,” and the like may refer to different or same objects. Other definitions, explicit and implicit, may be included below. 
     In some examples, values, procedures, or apparatus are referred to as “best,” “lowest,” “highest,” “minimum,” “maximum,” or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections. 
     In conventional communication systems, a power level at a terminal device may be not high. On one hand low power can reduce the cost of equipment, on the other hand low power means lower uplink coverage. In some embodiment, the terminal device may perform retransmission via radio resource control (RRC) signaling to address coverage issues. 
     When transmitting physical uplink shared channel (PUSCH) scheduled by downlink control information in physical downlink control channel (PDCCH), if the terminal device is configured with pusch-AggregationFactor, the same symbol allocation is applied across the pusch-AggregationFactor consecutive slots and the PUSCH is limited to a single transmission layer. The terminal device shall repeat the transport block across the pusch-AggregationFactor consecutive slots applying the same symbol allocation in each slot. 
     For PUCCH formats  1 ,  3 , or  4 , the terminal device can be configured a number of slots for repetitions of a PUCCH transmission by respective nrofSlots. Before dedicate RRC configuration, there is no repetition on PUSCH and PUCCH. 
     According to conventional technologies, the terminal device may determine a coverage enhancement level required for the terminal device; repeatedly transmitting a physical random access channel (PRACH) signal. However, it does not discuss how to determine the coverage enhancement level. 
     In other conventional technologies, the repetition may be determined based on a selected transport block size. However, it does not solve the low power issue at the terminal device. Therefore, how to signal more repetition of PUSCH/PUCCH in RRC signal and how to signal and perform repetition for message 3 PUSCH and HARQ-ACK feedback of msg4 on PUCCH needs to be further studied. 
     In order to solve at least part of the aforementioned problems, new technologies in repetition of transmission during an access procedure are needed. According to embodiments of the present disclosure, a network device is able to configure resources dedicated to repetition of transmission during the access procedure. If a terminal device determines to perform the repetition of transmission, the terminal device uses the dedicated resources for the transmission. The numbers of the repetition are determined based on a target power for the transmission and a maximum power at the terminal device. In this way, it improves coverage of the terminal device and success in accessing channel. 
       FIG.  1    illustrates a schematic diagram of a communication system in which embodiments of the present disclosure can be implemented. The communication system  100 , which is a part of a communication network, comprises a terminal device  110 - 1 , a terminal device  110 - 2 , . . . , a terminal device  110 -N, which can be collectively referred to as “terminal device(s)  110 .” 
     The communication system  100  further comprises a network device  120 . In the communication system  100 , the network devices  110  and the terminal devices  120  can communicate data and control information to each other. The numbers of terminal devices and network devices shown in  FIG.  1    are given for the purpose of illustration without suggesting any limitations. 
     Communications in the communication system  100  may be implemented according to any proper communication protocol(s), comprising, but not limited to, cellular communication protocols of the first generation (1G), the second generation (2G), the third generation (3G), the fourth generation (4G) and the fifth generation (5G) and on the like, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and/or any other protocols currently known or to be developed in the future. Moreover, the communication may utilize any proper wireless communication technology, comprising but not limited to: Code Divided Multiple Address (CDMA), Frequency Divided Multiple Address (FDMA), Time Divided Multiple Address (TDMA), Frequency Divided Duplexer (FDD), Time Divided Duplexer (TDD), Multiple-Input Multiple-Output (MIMO), Orthogonal Frequency Divided Multiple Access (OFDMA) and/or any other technologies currently known or to be developed in the future. 
     Embodiments of the present disclosure will be described in detail below. Reference is first made to  FIG.  2   , which shows a signaling chart illustrating interactions  200  among network devices according to some example embodiments of the present disclosure. Only for the purpose of discussion, the process  200  will be described with reference to  FIG.  1   . The process  200  may involve the terminal device  110 - 1  and the network device  120  in  FIG.  1   . 
     The network device  120  transmits  2005  information to the terminal device  110 - 1 . The information indicates one or more resources allocated for a repetition of transmission during the access procedure. The resources may be dedicated PRACH resources. Alternatively, the resources may be different preamble indexes. The information may be transmitted via RRC system information block. It should be noted that the information can be transmitted via any suitable signaling. 
     In some embodiments, the terminal device  110 - 1  may determine  2010  the number of repetition of transmission based on a target power of the transmission and an available power at the terminal device  110 - 1 . By way of example, the available power may be the maximum power of the terminal device  110 - 1 . For example, the margin power of the terminal device  110 - 1  may be determined based on the following: 
         S=P _target+ PL−P _available  (1)
 
     where P_target is the target power (for example, PREAMBLE_RECEIVED_TARGET_POWER) provided by higher layers, PL is the path loss, and P_available is the maximum power at the terminal device  110 - 1 . In this situation, the transmission power during the access procedure is minimum (P_available, P_target+PL). 
     By way of example, the repetition factor which is represented as “N” can be obtained from Table 1. It should be noted that the values in Table 1 are only examples not limitations. 
     
       
         
           
               
               
               
               
               
               
               
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                 S 
                 s &lt;= 0 
                 0 &lt; s &lt;= 3 
                 3 &lt; s &lt;= 4.77 
                 4.77 &lt; s &lt;= 6 
                 6 &lt; s &lt;= 7 
                 7 &lt; s &lt;= 7.78 
                 7.78 &lt; s &lt;= 8.85 
                 S &gt; 8.85 
               
               
                   
               
             
            
               
                 N 
                 1 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
                 8 
               
               
                   
               
            
           
         
       
     
     In some embodiments, the terminal device  110 - 1  may determine the number of repetitions “Nm” is equal to the selected repetition factor N. Alliteratively, the number of repetitions may be larger than the selected repetition factor N. The S may be calculated only for the first PRACH transmission and the selected N may be used for the rest PRACH procedure. 
     In some embodiments, the terminal device  110 - 1  may determine the repetition Nm that the minimum value configured by RRC which is equal or larger than selected N. The terminal device  110 - 1  may use the Nm in random access response (RAR) for the following transmission once the granted radio network temporary identifier (RNTI) is equal to temporary cell radio network temporary identifier (TC-RNTI) in RAR. 
     The terminal device  110 - 1  determines  2015  a target resource based at least in part on the information. In this way, the repetitions of transmission during the access procedure can be achieved. The repetition can be adjusted based on the power of the terminal device, thereby improving the success in access procedure. 
     In some embodiments, the resources may be configured per repetition. For example, the network device  120  may configure different preambles for different numbers of repetition. In other embodiment, the network device  120  may configure different PRACH resources for different numbers of repetition. By way of example, the information may comprise “Msg3-repetition4-preamble-list SEQUENCE of (1 . . . maxPreamblePerRepetation) integer (1 . . . 64)” which is used to configure the PRACH preamble for 4 times repetition PUSCH transmission. 
     In other example embodiments, the information may indicate that the preamble indexes  11 - 20  are used for 4 times repetition and the preamble indexes  21 - 30  are used for 8 times repetition. In this situation, if the terminal device  110 - 1  determines the number of repetitions to be 4 according to Table 1, the terminal device  110 - 1  may select a preamble from the preambles  11 - 20 . 
     Alternatively, the resources may be allocated for all repetitions. In this situation, if the terminal device  110 - 1  determines to perform the repetitions of the transmission, the terminal device  110 - 1  may determine the target resource based on the information. In this way, the network device  120  may understand that the terminal device  110 - 1  supports the repetitions. 
     The terminal device  110 - 1  transmits  2020  an access request to the network device  120 . In some embodiments, the terminal device  110 - 1  may transmit message 1 to the network device  120 . For example, if the terminal device  110 - 1  determines the number of repetitions to be 4, the terminal device  110 - 1  may transmit the preamble index in the Msg3-repetition4-preamble-list. Alternatively, the terminal device  110 - 1  may transmit message A to the network device  120 . Similarly, if the terminal device  110 - 1  determines the number of repetitions to be 4, the terminal device  110 - 1  may transmit the preamble index in a preamble list allocated for the message A. 
     In some embodiments, the network device  120  may determine  2025  the number of repetitions. For example, the network device  120  may estimate the available power at the terminal device  110 - 1  based on the received access request. The network device  120  may compare the estimated power with the target power and determine the number of repetitions based on the comparison. By way of example, the network device  120  may determine the number of repetitions according to Table 1 above. For example, if the difference between the target power and the estimated power is smaller than one and lager than zero, the network device  120  may determine the number of repetitions is two. 
     The network device  120  transmits  2030  an access response to the terminal device  110 - 1 . For example, the network device  120  may transmit message 2 to the terminal device  110 - 1 . Alternatively, the network device  120  may transmit message B to the terminal deice  110 - 1 . In some embodiments, the access response (for example, the message 2) may indicate the number of repetitions determined by the network device  120 . It should be noted that the access response may also indicate other resource allocation. For example, the access response may comprise one or more radio network temporary identifiers. 
     Alternatively or in addition, the terminal device  110 - 1  may transmit  2035  a connection request to the network device  120  based on the number of repetitions. For example, the terminal device  110 - 1  may retransmit message 3 to the network device  120  based on the number of repetitions. In some embodiments, the terminal device  110 - 1  may use the number of repetitions “Nm” as the pusch-AggregationFactor for message 3 PUSCH transmission. Alternatively, the terminal device  110 - 1  may use the number of repetitions “Nm” as nrofSlots for PUCCH transmission. 
     In an example embodiment, the terminal device  110 - 1  may determine a time resource for the connection request based on Table 2 below. For example, there may be 4 bits PUSCH time resource allocation filed. Table 2 may combine encoding the number of repetition and other PUSCH resource application parameters. It should be noted that the parameters in Table 2 are only examples not limitations. 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
                 TABLE 2 
               
               
                   
                   
               
               
                   
                   
                 PUSCH 
                   
                   
                   
                 The number  
               
               
                   
                 Row 
                 mapping 
                   
                 Start  
                   
                 of repetition 
               
               
                   
                 index 
                 type 
                 K2 
                 point 
                 Length 
                 (Nm) 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                   
                 1 
                 Type A 
                 j 
                 0 
                 14 
                 2 
               
               
                   
                 2 
                 Type A 
                 j 
                 0 
                 10 
                 2 
               
               
                   
                 3 
                 Type A 
                 j + 1 
                 0 
                 14 
                 2 
               
               
                   
                 4 
                 Type A 
                 j + 1 
                 0 
                 10 
                 2 
               
               
                   
                 5 
                 Type A 
                 j + 2 
                 0 
                 14 
                 2 
               
               
                   
                 6 
                 Type A 
                 j + 2 
                 0 
                 10 
                 7 
               
               
                   
                 7 
                 Type A 
                 j + 3 
                 0 
                 14 
                 2 
               
               
                   
                 8 
                 Type A 
                 j + 3 
                 0 
                 10 
                 2 
               
               
                   
                 9 
                 Type A 
                 j 
                 0 
                 14 
                 4 
               
               
                   
                 10 
                 Type A 
                 j 
                 0 
                 10 
                 4 
               
               
                   
                 11 
                 Type A 
                 j + 2 
                 0 
                 14 
                 4 
               
               
                   
                 12 
                 Type A 
                 j + 2 
                 0 
                 10 
                 4 
               
               
                   
                 13 
                 Type A 
                 j 
                 0 
                 14 
                 8 
               
               
                   
                 14 
                 Type A 
                 j 
                 0 
                 10 
                 8 
               
               
                   
                 15 
                 Type A 
                 j + 2 
                 0 
                 14 
                 8 
               
               
                   
                 16 
                 Type A 
                 j + 2 
                 0 
                 10 
                 8 
               
               
                   
                   
               
            
           
         
       
     
     In some embodiments, the network device  120  may transmit  2040  a connection response. For example, the network device  120  may transmit message 4 to the terminal device  110 - 1 . The terminal device  110 - 1  may transmit  2045  a feedback to the network device  120 . In some embodiments, the terminal device  110 - 1  may retransmit the feedback based on the number of repetitions. 
     The network device  120  may transmit  2050  an indication to the terminal device  110 - 1 . The indication may comprise the extended number of supported repetitions after the access procedure. For example, a new RRC parameter pusch-AggregationFactor-extend may be transmitted. 
     In some embodiments, the number of repetitions may be extended, for example, to 16, 32 or any suitable number. For example, if pusch-AggregationFactor-extend is present and pusch-AggregationFactor is not present, it means that the number of repetitions has been extended to 16 and 32. 
     Alternatively, if pusch-AggregationFactor is not present and pusch-AggregationFactor-extend is present, the number of repetitions may be up to 16. When both pusch-AggregationFactor and pusch-AggregationFactor-extend are present, the number of repetitions is pusch-AggregationFactor value multiplying pusch-AggregationFactor-extend value, for example, 32, 64 or 128. It should be noted that the number of repetitions can be any suitable number. 
     According to embodiments of the present disclosure, it can improve coverage of the terminal device. The terminal device is still able to access the channel even if the power at the terminal device may not be strong enough. Moreover, uplink coverage performance can be further improved for coverage limited scenario or lower power equipment. 
       FIG.  3    shows a flowchart of an example method  300  in accordance with an embodiment of the present disclosure. Only for the purpose of illustrations, the method  300  can be implemented at a terminal device  110 - 1  as shown in  FIG.  1   . 
     At block  310 , the terminal device  110 - 1  receives information from the network device  120 . The information indicates one or more resources allocated for repetitions of transmission during the access procedure. The resources may be dedicated physical random access channel (PRACH) resources. Alternatively, the resources may be different preamble indexes. The information may be transmitted via radio resource control (RRC) system information block. It should be noted that the information can be transmitted via any suitable signaling. 
     At block  320 , the terminal device  110 - 1  determines a target resource based at least in part on the information if the repetitions of the transmission are applicable during the access procedure. In this way, the repetitions of transmission during the access procedure can be achieved. The repetition can be adjusted based on the power of the terminal device, thereby improving the success in access procedure. 
     In some embodiments, the terminal device  110 - 1  may determine  2010  the number of repetitions of transmission based on a target power of the transmission and an available power at the terminal device  110 - 1 . By way of example, the available power may be the maximum power of the terminal device  110 - 1 . 
     In some embodiments, the resources may be configured per repetition. For example, the network device  120  may configure different preambles for different numbers of repetition. In other embodiment, the network device  120  may configure different PRACH resources for different numbers of repetition. By way of example, the information may comprise “Msg3-repetition4-preamble-list SEQUENCE of (1 . . . maxPreamblePerRepetation) integer (1 . . . 64)” which is used to configure the PRACH preamble for 4 times repetition PUSCH transmission. 
     In other example embodiments, the information may indicate that the preamble indexes  11 - 20  are used for 4 times repetition and the preamble indexes  21 - 30  are used for 8 times repetition. In this situation, if the terminal device  110 - 1  determines the number of repetitions to be 4 according to Table 1, the terminal device  110 - 1  may select a preamble from the preambles  11 - 20 . 
     Alternatively, the resources may be allocated for all repetitions. In this situation, if the terminal device  110 - 1  determines to perform the repetitions of the transmission, the terminal device  110 - 1  may determine the target resource based on the information. In this way, the network device  120  may understand that the terminal device  110 - 1  supports the repetitions. 
     In some embodiments, the terminal device  110 - 1  may determine the repetition Nm that the minimum value configured by RRC which is equal or larger than selected N. The terminal device  110 - 1  may use the Nm in RAR for the following transmission once the granted radio network temporary identifier (RNTI) is equal to temporary cell radio network temporary identifier (TC-RNTI) in RAR. 
     At block  330 , the terminal device  110 - 1  transmits an access request to the network device  120 . In some embodiments, the terminal device  110 - 1  may transmit message 1 to the network device  120 . For example, if the terminal device  110 - 1  determines the number of repetitions to be 4, the terminal device  110 - 1  may transmit the preamble index in the Msg3-repetition4-preamble-list. Alternatively, the terminal device  110 - 1  may transmit message A to the network device  120 . Similarly, if the terminal device  110 - 1  determines the number of repetitions to be 4, the terminal device  110 - 1  may transmit the preamble index in a preamble list allocated for the message A. In some embodiments, the terminal device  110 - 1  may receive an access response from the network device  120 . The access response may indicate the number of repetitions during the access procedure which is determined by the network device  120 . 
     Alternatively or in addition, the terminal device  110 - 1  may transmit a connection request to the network device  120  based on the number of repetitions. For example, the terminal device  110 - 1  may retransmit message 3 to the network device  120  based on the number of repetitions. In some embodiments, the terminal device  110 - 1  may use the number of repetitions “Nm” as the pusch-AggregationFactor for message 3 PUSCH transmission. Alternatively, the terminal device  110 - 1  may use the number of repetitions “Nm” as nrofSlots for PUCCH transmission. 
     In an example embodiment, the terminal device  110 - 1  may determine a time resource for the connection request based on Table 2 above. For example, there may be 4 bits PUSCH time resource allocation filed. 
     In some embodiments, the terminal device  110 - 1  may transmit a feedback to the network device  120 . In some embodiments, the terminal device  110 - 1  may retransmit the feedback based on the number of repetitions. 
     The terminal device  110 - 1  may receive an indication from the network device  120 . The indication may comprise the extended number of supported repetitions after the access procedure. For example, a new RRC parameter pusch-AggregationFactor-extend may be transmitted. 
     In some embodiments, the number of repetitions may be extended, for example, to 16, 32 or any suitable number. For example, if pusch-AggregationFactor-extend is present and pusch-AggregationFactor is not present, it means that the number of repetitions has been extended to 16 and 32. 
     Alternatively, if pusch-AggregationFactor is not present and pusch-AggregationFactor-extend is present, the number of repetitions may be up to 16. When both pusch-AggregationFactor and pusch-AggregationFactor-extend are present, the number of repetitions is pusch-AggregationFactor value multiplying pusch-AggregationFactor-extend value, for example, 32, 64 or 128. It should be noted that the number of repetitions can be any suitable number. 
       FIG.  4    shows a flowchart of an example method  400  in accordance with an embodiment of the present disclosure. Only for the purpose of illustrations, the method  400  can be implemented at a network device  120  as shown in  FIG.  1   . 
     At block  410 , the network device  120  transmit information to the terminal device  110 - 1 . The information indicates one or more resources allocated for repetitions of transmission during the access procedure. The resources may be dedicated PRACH resources. Alternatively, the resources may be different preamble indexes. The information may be transmitted via RRC system information block. It should be noted that the information can be transmitted via any suitable signaling. 
     In some embodiments, the resources may be configured per repetition. For example, the network device  120  may configure different preambles for different numbers of repetition. In other embodiment, the network device  120  may configure different PRACH resources for different numbers of repetition. Alternatively, the resources may be allocated for all repetitions. 
     In some embodiments, the network device  120  may determine  2025  the number of repetitions. For example, the network device  120  may estimate the available power at the terminal device  110 - 1  based on the received access request. The network device  120  may compare the estimated power with the target power and determine the number of repetitions based on the comparison. 
     At block  420 , the network device  120  transmits an access response to the terminal device  110 - 1 . For example, the network device  120  may transmit message 2 to the terminal device  110 - 1 . Alternatively, the network device  120  may transmit message B to the terminal deice  110 - 1 . In some embodiments, the access response may indicate the number of repetitions determined by the network device  120 . It should be noted that the access response may also indicate other resource allocation. For example, the access response may comprise one or more radio network temporary identifiers. 
     In some embodiments, the network device  120  may transmit a connection response. For example, the network device  120  may transmit message 4 to the terminal device  110 - 1 . The network device  120  may transmit an indication to the terminal device  110 - 1 . The indication may comprise the extended number of supported repetitions after the access procedure. For example, a new RRC parameter pusch-AggregationFactor-extend may be transmitted. 
     In some embodiments, the number of repetitions may be extended, for example, to 16, 32 or any suitable number. For example, if pusch-AggregationFactor-extend is present and pusch-AggregationFactor is not present, it means that the number of repetitions has been extended to 16 and 32. 
     Alternatively, if pusch-AggregationFactor is not present and pusch-AggregationFactor-extend is present, the number of repetitions may be up to 16. When both pusch-AggregationFactor and pusch-AggregationFactor-extend are present, the number of repetitions is pusch-AggregationFactor value multiplying pusch-AggregationFactor-extend value, for example, 32, 64 or 128. It should be noted that the number of repetitions can be any suitable number. 
       FIG.  5    is a simplified block diagram of a device  500  that is suitable for implementing embodiments of the present disclosure. The device  500  can be considered as a further example implementation of the terminal device  110  and the network device  120  as shown in  FIG.  1   . Accordingly, the device  500  can be implemented at or as at least a part of the terminal device  110  or the network device  120 . 
     As shown, the device  500  includes a processor  510 , a memory  520  coupled to the processor  510 , a suitable transmitter (TX) and receiver (RX)  540  coupled to the processor  510 , and a communication interface coupled to the TX/RX  540 . The memory  520  stores at least a part of a program  530 . The TX/RX  540  is for bidirectional communications. The TX/RX  540  has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this application may have several ones. The communication interface may represent any interface that is necessary for communication with other network elements, such as X2 interface for bidirectional communications between eNBs, is S1 interface for communication between a Mobility Management Entity (MME)/Serving Gateway (S-GW) and the eNB, Un interface for communication between the eNB and a relay node (RN), or Uu interface for communication between the eNB and a terminal device. 
     The program  530  is assumed to include program instructions that, when executed by the associated processor  510 , enable the device  500  to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to  FIG.  2  to  4   . The embodiments herein may be implemented by computer software executable by the processor  510  of the device  500 , or by hardware, or by a combination of software and hardware. The processor  510  may be configured to implement various embodiments of the present disclosure. Furthermore, a combination of the processor  510  and memory  520  may form processing means  550  adapted to implement various embodiments of the present disclosure. 
     The memory  520  may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory  520  is shown in the device  500 , there may be several physically distinct memory modules in the device  500 . The processor  510  may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples. The device  500  may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor. 
     Generally, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it will be appreciated that the blocks, apparatus, systems, techniques or is methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof. 
     The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium. The computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the process or method as described above with reference to any of  FIGS.  2 - 4   . Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various embodiments. Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media. 
     Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented. The program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server. 
     The above program code may be embodied on a machine readable medium, which may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine readable medium may be a machine readable signal medium or a machine readable storage medium. A machine readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the machine readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. 
     Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are contained in the above discussions, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to particular embodiments. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable sub-combination. 
     Although the present disclosure has been described in language specific to structural features and/or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.