Abstract:
The present disclosure relates to a communication method and system for converging a 5 th  Generation (5G) communication system for supporting higher data rates beyond a 4 th  Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A cell selection/re-selection method and an apparatus adapted thereto is provided. The cell selection method of a terminal includes: receiving, from a base station, first maximum power information, PEMAX1 and second maximum power information, PEMAX2, related to maximum transmission power levels of the terminal on the uplink; calculating a compensation parameter, Pcompensation, related to uplink transmission power of the terminal, using the first maximum power information and the second maximum power information; calculating a cell selection reception level value, Srxlev, using the compensation parameter; and selecting a cell based on the calculated cell selection reception level value.

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) AND CLAIM OF PRIORITY 
       [0001]    The present application is related to and claims the benefit under 35 U.S.C. §119(e) of U.S. Provisional application No. 62/246,898 filed on Oct. 27, 2015, in the U.S. Patent and Trademark Office, the entire disclosure of which is hereby incorporated by reference. 
     
    
     TECHNICAL FIELD 
       [0002]    The present invention relates to wireless communication systems, and more particularly, to a method and apparatus for user equipment (UE) to perform the cell selection and re-selection, using P MAX  parameters. 
       BACKGROUND 
       [0003]    In order to meet the increase in the demand for wireless data traffic after the commercialization of 4G communication systems, considerable effort has been made to develop pre-5G communication systems or improved 5G communication systems. In order to achieve a high data transmission rate, 5G communication systems are being developed to be implemented in a band of extremely high frequency, or millimeter wave (mmWave), e.g., a band of 60 GHz. This is one reason why ‘5G communication systems’ or ‘pre-5G communication systems’ are called ‘beyond 4G network communication systems’ or ‘post LTE systems.’ In order to reduce the occurrence of stray electric waves in a band of extremely high frequency energy and to increase the transmission distance of electric waves in 5G communication systems, various technologies being explored, for example: beamforming, massive MIMO, Full Dimensional MIMO (FD-MIMO), array antennas, analog beam-forming, large scale antennas, etc. In order to improve system networks for 5G communication systems, various technologies have been developed, e.g.: evolved small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network, Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), interference cancellation, etc. In addition, for 5G communication systems, other technologies have been developed, e.g., Hybrid FSK and QAM Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), as Advanced Coding Modulation (ACM), Filter Bank Multi Carrier (FBMC), non-orthogonal multiple access (NOMA), sparse code multiple access (SCMA), etc. 
         [0004]    The Internet has evolved from a human-based connection network, where humans create and consume information; to the Internet of Things (IoT) where distributed configurations, such as objects, exchange information with each other to process the information. The technology related to the IoT is starting to be combined with, for example, a technology for processing big data through connection with a cloud server, and this is called an Internet of Everything (IoE) technology. In order to manifest the IoT, various technical components are required, such as, a sensing technology, wired/wireless communication and network infra technology, a service interfacing technology, a security technology, etc. In recent years, a sensor network for connecting objects, Machine to Machine (M2M), Machine Type Communication (MTC), etc. have been researched. Under the IoT environment, intelligent Internet Technology (IT) services may be provided to collect and analyze data obtained from objects connected to each other and thus to create new value for human life. As existing IT technologies are fused and combined with various industries, the IoT may also be applied within various fields, such as: smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, health care, smart home appliances, high quality medical services, etc. 
         [0005]    To this end, various attempts have been made to apply 5G communication systems to the IoT. For example, various technologies related to sensor networks, Machine to Machine (M2M), Machine Type Communication (MTC), etc., have been implemented by beam-forming, MIMO, array antenna, etc., as 5G communication technology. The application of the cloud RAN as a big data processing technology described above may be an example of a hybrid of 5G technology and IoT technology. 
         [0006]    As such, in order to meet the increase in the demand for wireless data traffic, research has been undertaken to develop communication systems in various technical fields. Examples of the communication systems are device to device (D2D) communication, a carrier aggregation system for operating a number of cells, a multiple antenna system using large scale antennas, etc. 
       SUMMARY 
       [0007]    To address the above-discussed deficiencies, it is a primary object to provide a method and apparatus that enables user equipment (UE) to perform the cell selection and re-selection using a number of PMAX parameters. 
         [0008]    The present invention further provides a method and apparatus for increasing the reliability of a Semi-Persistent Scheduling (SPS) activation signal and an SPS deactivation signal in the shared SPS operation. 
         [0009]    In accordance with an aspect of the present invention, a cell selection method of a terminal is provided. The method includes: receiving, from a base station, first maximum power information, PEMAX1, and second maximum power information, PEMAX2, related to the maximum transmission power level of the terminal on the uplink; calculating a compensation parameter, Pcompensation, related to uplink transmission power of the terminal, using the first maximum power information and the second maximum power information; calculating a cell selection reception level value, Srxlev, using the compensation parameter; and selecting a cell based on the calculated cell selection reception level value. 
         [0010]    Preferably, the first maximum power information and the second maximum power information is contained in system information transmitted from the base station. 
         [0011]    Preferably, the compensation parameter is calculated by the following Equation 1: 
         [0000]        P compensation=max( PE MAX1 −P PowerClass,0)−{min( PE MAX2, P PowerClass)−min( PE MAX1, P PowerClass)}  Equation (1)
 
         [0000]    where Pcompensation denotes the compensation parameter, PEMAX1 denotes the first maximum power information, PEMAX2 denotes the second maximum power information, and PPowerClass denotes the maximum RF output power of the terminal. 
         [0012]    Preferably, the cell selection reception level value, Srxlev, is calculated by the following Equation 2: 
         [0000]        Srxlev=Qrxlevmeas− ( Qrxlev min +Qrxlev minoffset)− P compensation  Equation (2)
 
         [0000]    where Srxlev denotes cell selection reception level value, Qrxlevmeas denotes a measured received strength value, and Qrxlevminoffset denotes a power offset value for base stations with priority. 
         [0013]    Preferably, selecting a cell includes: periodically selecting a cell, based on the calculated cell selection reception level value, to discover a public land mobile network (PLMN) with high priority. 
         [0014]    Preferably, the first maximum power information is a value used by a terminal that does not support a number of frequency bands, and the second maximum power information corresponds to at least one of a number of frequency bands supported by the terminal. 
         [0015]    In accordance with another aspect of the present invention, a terminal configured to perform the cell selection is provided. The terminal includes: a transceiver for performing the transmission/reception of signals; and a controller for: controlling the transceiver to receive, from a base station, first maximum power information, PEMAX1, and second maximum power information, PEMAX2, related to the maximum transmission power level of the terminal on the uplink; calculating a compensation parameter, Pcompensation, related to uplink transmission power of the terminal, using the first maximum power information and the second maximum power information; calculating a cell selection reception level value, Srxlev, using the compensation parameter; and selecting a cell based on the calculated cell selection reception level value. 
         [0016]    Before undertaking the DETAILED DESCRIPTION below, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document: the terms “include” and “comprise,” as well as derivatives thereof, mean inclusion without limitation; the term “or,” is inclusive, meaning and/or; the phrases “associated with” and “associated therewith,” as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, or the like; and the term “controller” means any device, system or part thereof that controls at least one operation, such a device may be implemented in hardware, firmware or software, or some combination of at least two of the same. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0017]    For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts: 
           [0018]      FIG. 1  illustrates a configuration of an LTE system according to an embodiment of the present invention; 
           [0019]      FIG. 2  illustrates a radio protocol stack in an LTE system according to embodiments of the present invention; 
           [0020]      FIG. 3  illustrates a flow diagram of operations between UE and eNB according to embodiment of the present invention; 
           [0021]      FIG. 4  illustrates a flowchart of a method for UE to perform a cell selection or re-selection according to embodiment of the present invention; 
           [0022]      FIG. 5  illustrates a configuration of UE according to embodiments of the present invention; 
           [0023]      FIG. 6  illustrates a configuration of a primary eNB according to embodiments of the present invention; 
           [0024]      FIG. 7  illustrates a flow diagram of operations between UE and eNB according to embodiment of the present invention; 
           [0025]      FIG. 8  illustrates a format of a buffer status report (BSR) according to embodiment of the present invention; 
           [0026]      FIG. 9  illustrates a flowchart of operations of UE according to embodiment of the present invention; and 
           [0027]      FIG. 10  illustrates a flowchart of operations of an eNB according to embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0028]      FIGS. 1 through 10 , discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged electronic device. 
         [0029]    Hereinafter, embodiments of the present invention are described in detail with reference to the accompanying drawings. The same reference numbers are used throughout the drawings to refer to the same or similar parts. Detailed descriptions of well-known functions and structures incorporated herein may be omitted to avoid obscuring the subject matter of the invention. 
         [0030]    Although the following disclosure describes embodiments of the present invention based on Long Term Evolution (LTE) defined in the specification of 3GPP, it should be understood that the subject matter of the present invention can also be applied to other communication systems that have similar technical backgrounds to the present invention. It will be also appreciated to those skilled in the art that the embodiments may be modified and the modifications may also be applied to other communication systems, without departing from the scope of the present invention. 
         [0031]    In the following description, LTE system and carrier aggregation are briefly explained. 
         [0032]      FIG. 1  illustrates a configuration of an LTE system according to an embodiment of the present invention. 
         [0033]    With reference to  FIG. 1 , the LTE system configures the wireless access network, including evolved Node Bs (called eNBs, Node Bs or base stations)  105 ,  110 ,  115 , and  120 , a mobility management entity (MME)  125 , and a serving-gateway (S-GW)  130 . User equipment (UE) (which is also called a terminal)  135  is connected to an external network via the eNB  105 ,  110 ,  115 , or  120  and the S-GW  130 . 
         [0034]    eNBs  105  to  120  correspond to existing Node B of the Universal Mobile Telecommunications System (UMTS). eNBs  105  to  120  are connected to UE  135  via wireless channels, performing more complicated functions than existing Node B. 
         [0035]    In an LTE system, since real-time services such as a Voice over IP (VoIP) service and all user traffic are serviced via shared channels, devices are required to collect information regarding states, such as buffer states of UE devices, available transmission power states, channel states, etc., and to make a schedule. This task is performed via eNBs  105  to  120 . 
         [0036]    One eNB controls a number of cells. For example, in order to implement a transmission rate of 100 Mbps, an LTE system employs orthogonal frequency division multiplexing (OFDM) as a wireless access technology at a bandwidth of 20 MHz. It also employs adaptive modulation &amp; coding (AMC) to determine modulation scheme and channel coding rate, meeting with the channel state of UE. 
         [0037]    The S-GW  130  is an entity that provides data bearers. The S-GW  130  establishes or removes data bearers according to the control of the MME  125 . The MME  125  manages the mobility of UE and controls a variety of functions. The MME  125  connects to a number of ENBs. 
         [0038]      FIG. 2  illustrates a radio protocol stack in an LTE system according to embodiments of the present invention. 
         [0039]    With reference to  FIG. 2 , UE and eNB have packet data convergence protocol (PDCP)  205  and  240 , radio link control (RLC)  210  and  235 , and medium access control (MAC)  215  and  230 , respectively. PDCP  205  and  240  compress/decompress the IP header. RLC  210  and  235  reconfigure PDCP packet data unit (PDU) in proper size and perform an automatic repeat request (ARQ) operation. 
         [0040]    MAC  215  and  230  connect to a number of RLC layer devices configured in one UE device. MAC  215  and  230  multiplex RLC PUDs to MAC PDU, and de-multiplex RLC PDUs from MAC PDU. Physical layers (PHY)  220  and  225  in UE and eNB channel-code and modulate data from the upper layers, create OFDM symbols, and transmit them via a wireless channel. In addition, PHY  220  and  225  demodulate and channel-decode OFDM symbols transmitted via a wireless channel, and transfer them to the upper layers. 
         [0041]    In some embodiments, user equipment (UE) enables to perform the cell selection and re-selection using a number of PMAX parameters. 
         [0042]    In LTE communication systems, the mobility of UE are divided into a type of mobility according to an instruction of eNB and a type of mobility that UE determines for itself. UE controls the UE′ mobility for itself in an idle state, i.e., performs the cell selection and cell re-selection. A process of UE to select/re-select a cell is also expressed as UE camps on a corresponding cell. UE is capable of determining whether it may camp on a corresponding cell, considering the downlink signal strength, the uplink transmission power of a cell, etc. 
         [0043]    With the development of hardware/software and the radio frequency (RF) technology of UE, UE is capable of satisfying the spectrum emission standard requiring a relatively large amount of transmission power. For example, in order to satisfy a specified emission standard, legacy UE has used transmission power of a maximum of 17 dBm. New UE is capable of satisfying the emission standard using transmission power of 23 dBm. 
         [0044]    When UE 1 maintaining a relatively low level of transmission power and UE 2 capable of using a relatively high level of transmission power coexist in a cell in order to satisfy the emission output standard, the present invention is capable of applying corresponding maximum levels of transmission power that differ from each other to the two UE devices respectively. 
         [0045]    The present invention transmits, to UE, a number of levels of uplink maximum transmission power, P MAX , allowed in a cell, so that the UE selects one of the levels of P MAX , based on the UE&#39;s condition. 
         [0046]    In particular, when UE: determines whether it camps on a specified cell; or detects a minimum fitness of using a neighboring cell and a serving cell in the cell re-selection (considering both the allowed uplink transmission power and the received strength of the downlink reference signal, which is denoted by Srxlevmin), the UE is capable of selecting part of a number of P MAX  parameters. The UE is capable of camping on a proper cell based on the selected P MAX  parameters. 
         [0047]    In some embodiments, following steps are included. 
         [0048]    1. Periodic cell selection
       Q rxlevmin,SIB1  and Pcompensation are used to calculate Srxlev; and P EMAX,SIB1 , P EMAX,SIB2 , and P PowerClass  are used to calculate Pcompensation; or   Q rxlevmin,SIB2  and Pcompensation are used to calculate Srxlev; and P PowerClass  and one of   P EMAX,SIB1  and P EMAX,SIB2  are used to calculate Pcompensation       
 
         [0052]    2-1. Determination as to whether to measure an intra-frequency non-serving cell for the cell re-selection; or 
         [0053]    2-2. Determination as to whether to measure an inter-frequency with equal or lower priority non-serving cell for the cell re-selection; or 
         [0054]    2-3. In order to determine whether to perform the cell re-selection to the inter-frequency with higher priority non-serving cell
       Q rxlevmin,SIB1  and Pcompensation are used to calculate Srxlev of a serving cell; and P EMAX,SIB1 , P EMAX,SIB2 , and P PowerClass  are used to calculate Pcompensation;   Q rxlevmin,SIB2  and Pcompensation are used to calculate Srxlev of a serving cell; and P PowerClass  and one of P EMAX,SIB1  and P EMAX,SIB2  are used to calculate Pcompensation; or   Q rxlevmin,SIB5  and Pcompensation are used to calculate Srxlev of a non-serving cell; and P EMAX,SIB5  and P PowerClass  are used to calculate Pcompensation       
 
         [0058]      FIG. 3  illustrates a flow diagram of operations between UE and eNB according to embodiment of the present invention. 
         [0059]    In a mobile communication system configured with UE  301  and eNB/cell  302 , UE  301  in an idle state receives system information in a cell in operation  305 . The system information may contain information regarding a number of levels of P MAX . 
         [0060]    Pmax_SIB1: Pmax broadcast via SIB1. Only one Pmax_SIB1 is within one cell. 
         [0061]    Pmax_SIB2: Pmax broadcast via SIB2. A number of Pmax_SIB2 may be within one cell. 
         [0062]    Pmax_SIB5: Pmax broadcast via SIB5. A number of Pmax_SIB5 may be within one cell. 
         [0063]    UE  301  performs the periodic cell selection, part of the processes of searching for a higher priority PLMN, in operation  310 . In this case, UE  301  calculates the use fitness (Srxlevmin) of a serving cell as in the following Equation 1-1. TABLE 1 shows some parameters indicated in Equation 1-1. 
         [0000]        Srxlev=Q   rxlevmeas −( Q   rxlevmin,SIB1   +Q   rxlevminoffset )− P compensation  Equation 1-1
 
         [0000]    
       
         
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
             
             
               
                 Srxlev 
                 Cell selection RX level value (dB) 
               
               
                 Q rxlevmeas   
                 Measured cell RX level value (RSRP) 
               
               
                 Q rxlevmin, SIB1   
                 Minimum required RX level in the cell (dBm) 
               
               
                   
                 Three different values are provided via SIB1, SIB3, 
               
               
                   
                 and SIB5. 
               
               
                   
                 A value, obtained from the equation, via SIB 1, is 
               
               
                   
                 used. 
               
               
                 Q rxlevminoffset   
                 Offset to the signalled Q rxlevmin  taken into account 
               
               
                   
                 in the Srxlev evaluation as a result of a periodic 
               
               
                   
                 search for a higher priority PLMN while camped 
               
               
                   
                 normally in a VPLMN [23.122] 
               
               
                 P EMAX, SIB1   
                 Maximum TX power level an UE may use when 
               
               
                   
                 transmitting on the uplink in the cell (dBm) 
               
               
                   
                 defined as P EMAX  in [TS 36.101] 
               
               
                   
                 A value, obtained via SIB 1 and used by UE that 
               
               
                   
                 does not support multiple band. 
               
               
                 P EMAX, SIB2   
                 Maximum TX power level an UE may use when 
               
               
                   
                 transmitting on the uplink in the cell (dBm) 
               
               
                   
                 defined as P EMAX  in [TS 36.101] 
               
               
                   
                 A number of pairs are obtained via SIB2. One 
               
               
                   
                 maximum per Frequency Band. 
               
               
                   
                 UE uses, as P EMAX, SIB2 , P EMAX  corresponding to a band 
               
               
                   
                 with the highest priority from among the bands 
               
               
                   
                 that the UE supports 
               
               
                 P PowerClass   
                 Maximum RF output power of the UE (dBm) according 
               
               
                   
                 to the UE power class as defined in [TS 36.101] 
               
               
                   
               
             
          
         
       
     
         [0000]        Srxlev=Q   rxlevmeas −( Q   rxlevmin,X   +Q   rxlevminoffset )− P compensation  Equation 1-2
 
         [0064]    In the equation 1-2, when Q rxlevmin,SIB2  is not broadcast in the serving cell (or UE supports none of Q rxlevmin,SIB2  in the serving cell), Q rxlevmin,X  is Q rxlevmin, SIB1 . When UE supports at least one of Q rxlevmin,SIB2  in the serving cell, Q rxlevmin,X  is Q rxlevmin, SIB2 . TABLE 2 shows a parameter indicated in Equation 1-2. 
         [0000]    
       
         
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
             
             
               
                 Q rxlevmin, SIB2   
                 Minimum required RX level in the cell (dBm). 
               
               
                   
                 A number of pairs are obtained via SIB2. One maximum 
               
               
                   
                 per Frequency Band. 
               
               
                   
                 UE uses, as P EMAX, SIB2 , Qrxlevmin, SIB2 corresponding 
               
               
                   
                 to a band with the highest priority from among the 
               
               
                   
                 bands that the UE supports 
               
               
                   
               
             
          
         
       
     
         [0000]        P compensation=max( P   EMAX,SIB1   −P   PowerClass ,0)−[min( P   EMAX,SIB2   ,P   PowerClass )−min( P   EMAX,SIB1   ,P   PowerClass )]  Equation 2-1
 
         [0065]    In the equation 2-1, when P EMAX,SIB2  is not broadcast in the serving cell (or UE does not support none of P EMAX,SIB2  in the serving cell), P EMAX,SIB2  is 0. 
         [0000]        P compensation=max( P   EMAX,X   −P   PowerClass ,0)  Equation 2-2
 
         [0066]    In the equation 2-2, when P EMAX,SIB2  is not broadcast in the serving cell (or UE does not support none of P EMAX,SIB2  in the serving cell), P EMAX,X  is P EMAX,SIB1 . When UE supports at least one of P EMAX,SIB2  in the serving cell, P EMAX,X  is P EMAX,SIB2 . 
         [0067]    In the periodic cell selection, Equations 1-1 and 2-1 or Equations 1-2 and 2-2 are used to calculate the cell fitness.
       In some embodiments of Equation 2-1, Pcompensation is negative in a cell where P PowerClass &gt;P EMAX,SIB2 , and a relatively high
           level of cell fitness for the same Qrxlevmeas is calculated, thereby resulting in the extension of coverage, Pcompensation is negative in a cell where P EMAX,SIB2 &gt;P PowerClass &gt;P EMAX,SIB1 ,   resulting in the extension of coverage. The extent of the extension of coverage is less   than that of the first case described above, and Pcompensation is positive when P PowerClass &lt;P EMAX,SIB1 , thereby resulting in the   reduction of coverage.   
               
 
         [0073]    When Srxlev of a serving cell is greater than ‘0’ and Squal is greater than ‘0,’ the UE  301  considers the serving cell to be a selectable cell. When there is a PLMN cell satisfying the conditions from among PLMN cells with higher priority, the UE selects the cell. 
         [0074]    The UE  301  is capable of measuring intra-frequency neighboring cells to perform the cell re-selection, while performing the periodic cell selection, in operation  315 . When the UE  301  ascertains that the following condition is satisfied, it is capable of measuring the intra-frequency neighboring cells. 
         [0075]    When the serving cell satisfies the conditions, Srxlev&gt;S IntraSearchP  and Squal&gt;S IntraSearchQ , the UE  301  may choose not to perform the measurement of intra-frequency neighboring cells. 
         [0076]    Otherwise, the UE may perform the measurement of intra-frequency neighboring cells.
       S IntraSearchP  and S IntraSearchQ  are provided via system information of a serving cell. The UE  301  calculates Srxlev of a serving cell by using either Equations 3-1 and 2-1 or Equations 3-2 and 2-2 as follows:       
 
         [0000]        Srxlev=Q   rxlevmeas   −Q   rxlevmin,SIB1   −P compensation  Equation 3-1
 
         [0000]        Srxlev=Q   rxlevmeas   −Q   rxlevmin,SIB2   −P compensation  Equation 3-2
 
         [0078]    The UE  301  is capable of performing the inter-frequency measurement for the cell re-selection. The inter-frequency measurement by the UE  301  is controlled by the cell re-selection priority (also called the priority). 
         [0079]    With respect to a frequency with a priority higher than that of a current serving cell/frequency, the UE  301  performs the periodic measurement for neighboring cells. On the other hand, with respect to a frequency with a priority less than or equal to that of a current serving cell/frequency, the UE  301  performs the measurement for neighboring cells only when a specified condition is satisfied. 
         [0080]    More specifically, the UE  301  determines whether the UE  301  measures neighboring cells whose frequency has a priority less than or equal to that of a serving cell/frequency, based on the following conditions in operation  320 . 
         [0081]    If the serving cell fulfils Srxlev&gt;S nonIntraSearchP  and Squal&gt;S nonIntraSearchQ , the UE may choose not to perform measurements of E-UTRAN inter-frequencies or inter-RAT frequency cells of equal or lower priority. 
         [0082]    Otherwise, the UE shall perform measurements of E-UTRAN inter-frequencies or inter-RAT frequency cells of equal or lower priority according to [10]. 
         [0083]    The UE  301  calculates Srxlev of a serving cell by using either Equations 3-1 and 2-1 or Equations 3-2 and Equation 2-2. 
         [0084]    When the UE  301  ascertains that a cell re-selection condition is satisfied from the neighboring cell measurement result, the UE  301  re-selects a new cell. When the UE  301  ascertains that the following condition is satisfied, the UE  301  re-selects a neighboring cell with a higher priority in operation  325 . The cell re-selection to a cell on a higher priority E-UTRAN frequency or inter-RAT frequency than the serving frequency shall be performed if: 
         [0085]    A cell of a higher priority RAT/frequency fulfils Srxlev&gt;Thresh X,HighP  during a time interval Tre-selection RAT ; and
       More than 1 second has elapsed since the UE camped on the current serving cell.       
 
         [0087]    The UE  301  calculates Srxlev of a neighboring cell under the conditions, by using Equations 4-1 and 5-1 as follows: 
         [0000]        Srxlev=Q   rxlevmeas   −Q   rxlevmin,SIB5   −P compensation  Equation 4-1
 
         [0000]        P compensation=max( P   EMAX,SIB5   −P   PowerClass ,0)  Equation 5-1
 
         [0088]    P EMAX,SIB5  is values each of which is signalled per frequency via SIB5. When P EMAX,SIB5  is not signalled for a frequency, UE uses P PowerClass  as P EMAX,SIB5  of the frequency. 
         [0089]    When the UE  301  ascertains that the following condition is satisfied, the UE  301  re-selects a cell with a priority less than or equal to that of a serving cell/frequency in operation  330 . 
         [0090]    The serving cell fulfils Srxlev&lt;Thresh Serving,LowP  and a cell of a lower priority RAT/frequency fulfils Srxlev&gt;Thresh X,LowP  during a time interval Treslection RAT ; and 
         [0091]    More than 1 second has elapsed since the UE camped on the current serving cell. 
         [0092]    The UE  301  calculates Srxlev of a neighboring cell by using Equations 4-1 and 5-1, and also Srxlev of a serving cell by using either Equations 3-1 and 2-1 or Equations 3-2 and 2-2. 
         [0093]      FIG. 4  illustrates a flowchart of a method for UE to perform the cell selection or re-selection according to embodiment of the present invention. 
         [0094]    A UE is powered on and performs the cell selection in operation  405 . 
         [0095]    When the UE has stored valid system information, the UE performs the stored information cell selection. Otherwise, the UE performs the initial cell selection. 
         [0096]    In the initial cell selection, the UE calculates Srxlev by using Equation 6 as follows. 
         [0000]        Srxlev=Qrxlevmeas−Qrxlev min, ini   Equation (6)
 
         [0097]    Qrxlevmin,ini is a value defined in the specification. It is used when the UE does not obtain system information regarding a corresponding cell. 
         [0098]    In the stored information cell selection, the UE calculates Srxlev by using either Equations 1-1 and 2-1 or Equations 1-2 and 2-2. 
         [0099]    The UE selects a cell whose Srxlev and Squal are greater than or equal to ‘0,’ and camps on the cell. 
         [0100]    The UE receives system information regarding the selected cell, and obtains the following parameters in operation  410 . 
         [0101]    One P EMAX, SIB1 , n P EMAX,SIB2 , one P EMAX, SIB3 , m P EMAX, SIB5 , one Q rxlevmin,SIB1 , n Q rxlevmin,SIB2 , one Q rxlevmin,SIB3 , and m Q rxlevmin,SIB5 , where m and n are positive integers. 
         [0102]    n is related to the number of frequency bands supported by a corresponding serving cell. When the number of frequency bands supported by a corresponding serving cell is n′, n and n′ has a relationship, n≦n′. 
         [0103]    m is related to the number of inter-frequency bands provided via SIB5. When the number of inter-frequency bands provided via SIB5 is m′, m and m′ has a relationship, m≦m′. 
         [0104]    The UE determines whether the UE measures neighbouring cells of the same frequency, considering Srxlev of a current serving cell in operation  415 . UE calculates Srxlev of a serving cell by using either Equations 3-1 and 2-1 or Equations 3-2 and 2-2. 
         [0105]    The UE determines whether the UE searches for neighboring cells of another frequency in operation  420 . The other frequency means not all frequencies except for the current frequency but only a frequency that is related to information provided via SIB5. 
         [0106]    The UE performs the periodic measurement for frequencies with a priority higher than that of the current frequency. UE determines whether the UE performs the measurement for frequencies with a priority less than or equal to that of the current frequency, considering Srxlev of a serving cell. 
         [0107]    The UE calculates Srxlev of a serving cell by using either Equations 3-1 and 2-1 or Equations 3-2 and 2-2. 
         [0108]    When the UE ascertains that a specified condition is satisfied, the UE re-selects a new cell in operation  425 . When UE re-selects a cell with high priority, the UE calculates Srxlev of neighboring cells by using Equations 4-1 and 5-1. 
         [0109]    When the UE re-selects a cell with priority less than or equal to that of a serving cell/frequency, the UE calculates Srxlev of neighboring cells by using Equations 4-1 and 5-1, and Srxlev of a serving cell by using either Equations 3-1 and 2-1 or Equations 3-2 and 2-2. 
         [0110]    Using Equations 1-1 and 2-1 to calculate Srxlev of a serving cell means that: Srxlev of a serving cell is calculated by using Q rxlevmin,SIB1  and Pcompensation; and Pcompensation is calculated by using P EMAX,SIB1 , P EMAX,SIB2 , and P PowerClass . 
         [0111]    Using Equations 1-2 and 2-2 to calculate Srxlev of a serving cell means that: Srxlev of a serving cell is calculated by using Pcompensation and either Q rxlevmin,SIB2  or Q rxlevmin,SIB1 ; and Pcompensation is calculated by using P PowerClass  and either P EMAX,SIB1  or P EMAX,SIB2 . 
         [0112]    Using Equations 3-1 and 2-1 to calculate Srxlev of a serving cell means that: Srxlev of a serving cell is calculated by using Q rxlevmin,SIB1  and Pcompensation; and Pcompensation is calculated by using P EMAX,SIB1 , P EMAX,SIB2 , and P PowerClass . 
         [0113]    Using Equations 3-2 and 2-2 to calculate Srxlev of a serving cell means that: Srxlev of a serving cell is calculated by using Q rxlevmin,SIB2  and Pcompensation; and Pcompensation is calculated by using P PowerClass  and either P EMAX,SIB1  or P EMAX,SIB2 . 
         [0114]    Using Equations 4-1 and 5-1 to calculate Srxlev of a neighboring cell means that: Srxlev of a corresponding cell is calculated by using Q rxlevmin,SIB5  and Pcompensation; and Pcompensation is calculated by using P EMAX,SIB5  and P PowerClass . 
         [0115]      FIG. 5  illustrates a configuration of UE according to embodiments of the present invention. 
         [0116]    With reference to  FIG. 5 , UE includes a Radio Frequency (RF) interface  510 , a baseband interface  520 , a storage  530 , and a controller  540 . 
         [0117]    The RF interface  510  performs functions relates to the transmission/reception of signals via a wireless channel, e.g., the conversion of frequency band, the amplification, etc. The RF interface  510  up-converts baseband signals output from the baseband interface  520  into RF band signals and transmits the RF signals via an antenna. The RF interface  510  down-converts RF band signals received via the antenna into baseband signals. 
         [0118]    The RF interface  510  is capable of including a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), an analog to digital convertor (ADC), etc. 
         [0119]    Although the embodiment is shown in  FIG. 5  so that UE includes only one antenna, it should be understood that the UE may be implemented to include a number of antennas. The RF interface  510  may also be implemented to include a number of RF chains. The RF interface  510  is capable of performing a beamforming operation. 
         [0120]    In order to perform a beamforming function, the RF interface  510  is capable of adjusting the phase and amplitude of individual signals transmitted/received via a number of antennas or antenna elements. The RF interface  510  is capable of performing MIMO and receiving a number of layers in MIMO. 
         [0121]    The baseband interface  520  performs the conversion between baseband signals and bitstream according to a physical layer rule of the system. For example, in data transmission, the baseband interface  520  encodes and modulates a transmission bitstream, thereby creating complex symbols. 
         [0122]    In the data reception, the baseband interface  520  demodulates and decodes baseband signals output from the RF interface  510 , thereby restoring a reception bitstream. For example, in data transmission according to the orthogonal frequency division multiplexing (OFDM), the baseband interface  520  encodes and modulates a transmission bitstream to create complex symbols, maps the complex symbols to sub-carriers, and configures OFDM symbols through the inverse fast Fourier transform (IFFT) operation and the cyclic prefix (CP) insertion. 
         [0123]    In the data reception, the baseband interface  520  splits baseband signals output from the RF interface  510  into OFDM symbol units, restores signals mapped to sub-carriers through the fast Fourier transform (FFT) operation, and then restores a reception bitstream through the demodulation and decoding operation. 
         [0124]    The baseband interface  520  and the RF interface  510  perform the transmission and reception of signals as described above. Accordingly, the baseband interface  520  and the RF interface  510  may also be called a transmitter, a receiver, a transceiver, a communication interface, etc. 
         [0125]    In addition, the baseband interface  520  and/or the RF interface  510  may include a number of communication modules to support wireless access technologies that differ from each other. Alternatively, the baseband interface  520  and/or the RF interface  510  may include different communication modules to process signals of different frequency bands. 
         [0126]    Examples of the wireless access technologies are: wireless LAN (e.g., IEEE 802.11), a cellular network (e.g., LTE), etc. Examples of the different frequency bands are: super high frequency (SHF) (e.g., 2.5 GHz band, 5 GHz band, etc.), millimeter wave (mmW) (e.g., 60 GHz band), etc. 
         [0127]    The storage  530  stores a default program for operating the UE, applications, settings, data, etc. In particular, the storage  530  is capable of storing information related to a second access node which performs wireless communication using a second wireless access technology. The storage  530  provides the stored data according to the request of the controller  540 . 
         [0128]    The controller  540  controls all operations of the UE. For example, the controller  540  controls the baseband interface  520  and the RF interface  510  to perform the transmission/reception of signals. The controller  540  controls the storage  540  to store/read data therein/therefrom. the controller  540  may be a circuit, an application-specific integrated circuit or at least one processor. 
         [0129]    To this end, the controller  540  is capable of including at least one processor. For example, the controller  540  is capable of including a communication processor (CP) for controlling the communication and an application processor (AP) for controlling upper layers such as applications. According to embodiments of the present invention, the controller  540  is capable of controlling the UE to perform the functions and the procedure described above referring to  FIGS. 3 and 4 . 
         [0130]      FIG. 6  illustrates a configuration of a primary eNB according to embodiments of the present invention. 
         [0131]    As shown in  FIG. 6 , the eNB includes an RF interface  610 , a baseband interface  620 , a backhaul communication interface  630 , a storage  640 , and a controller  650 . 
         [0132]    The RF interface  610  performs functions related to the transmission/reception of signals via a wireless channel, e.g., the conversion of frequency band, the amplification, etc. The RF interface  610  up-converts baseband signals output from the baseband interface  620  into RF band signals and transmits the RF signals via an antenna. The RF interface  610  down-converts RF band signals received via the antenna into baseband signals. 
         [0133]    The RF interface  610  is capable of including a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Although the embodiment is shown in  FIG. 6  so that the embodiment includes only one antenna, it should be understood that the first access node may be implemented to include a number of antennas. 
         [0134]    The RF interface  610  may also be implemented to include a number of RF chains. The RF processing unit  610  is capable of performing a beamforming operation. In order to perform a beamforming function, the RF interface  610  is capable of adjusting the phase and amplitude of individual signals transmitted/received via a number of antennas or antenna elements. The RF interface  610  is capable of transmitting one or more layers, thereby performing the downlink MIMO function. 
         [0135]    The baseband interface  620  performs the conversion between baseband signals and bitstream according to a physical layer rule of a first wireless access technology. For example, in the data transmission, the baseband interface  620  encodes and modulates a transmission bitstream, thereby creating complex symbols. 
         [0136]    In the data reception, the baseband interface  620  demodulates and decodes baseband signals output from the RF interface  610 , thereby restoring a reception bitstream. For example, in the data transmission according to the orthogonal frequency division multiplexing (OFDM), the baseband interface  620  encodes and modulates a transmission bitstream to create complex symbols, maps the created complex symbols to sub-carriers, and configures OFDM symbols through the inverse fast Fourier transform (IFFT) operation and the cyclic prefix (CP) insertion. 
         [0137]    In the data reception, the baseband interface  620  splits baseband signals output from the RF interface  610  into OFDM symbol units, restores signals mapped to sub-carriers through the fast Fourier transform (FFT) operation, and then restores a reception bitstream through the demodulation and decoding operation. The baseband interface  620  and the RF interface  610  perform the transmission and reception of signals as described above. Accordingly, the baseband interface  620  and the RF interface  610  may also be called a transmitter, a receiver, a transceiver, a communication interface, a wireless communication interface, etc. 
         [0138]    The backhaul communication interface  630  provides interfaces to communicate with other nodes in the network. That is, the backhaul communication interface  630  converts: a bitstream into a physical signal to be transmitted to other nodes of the primary eNB, e.g., an auxiliary eNB, a core network, etc.; and a physical signal from the other nodes into a bitstream. 
         [0139]    The storage  640  stores a default program for operating the primary eNB, applications, settings, data, etc. In particular, the storage  640  is capable of storing information regarding a bearer allocated to the connected UE, a measurement result reported from the connected UE, etc. The storage  640  is capable of providing the dual connectivity function to UE or storing information to determine whether to terminate the dual connectivity operation. The storage  640  provides the stored data according to the request of the controller  650 . 
         [0140]    The controller  650  controls all operations of the primary eNB. For example, the controller  650  controls the baseband interface  620 , the RF interface  610  and the backhaul communication interface  630  to perform the transmission/reception of signals. The controller  650  controls the storage  640  to store/read data therein/therefrom. To this end, the controller  650  is capable of including at least one processor.
       The controller  650  is capable of including a dual connectivity controller  652  which provides UE with a dual connectivity function. For example, the controller  650  is capable of controlling the primary eNB to perform the functions and procedure described above referring to  FIG. 3 .       
 
         [0142]    In some embodiments, the reliability of a Semi-Persistent Scheduling (SPS) activation signal and an SPS deactivation signal in the shared SPS operation are increased. 
         [0143]    In such embodiments, a UE enables to receive a signal for activating or releasing a shared SPS to transmit, to the eNB, a regular BSR for the ACK/NACK signaling in response to the received signal. 
         [0144]    With the evolution of mobile communication systems, the minimization of the uplink delay has become as an important issue. The present invention provides a shared SPS scheme for reducing the uplink relay. 
         [0145]    Most of the uplink delay is caused in processes where the UE requests the allocation of a transmission resource and the transmission resource is allocated. In a state where the UE is successively allocated an SPS transmission resource, when data is created, the UE is capable of performing the rapid transmission of the data. However, when SPS transmission resources are dedicatedly allocated to all UE devices, the transmission resources are excessively consumed. 
         [0146]    In order to resolve the problem, the present invention introduces a shared SPS scheme that allocates the same SPS transmission resource to a number of UE devices. UE devices configured with shared SPS perform the transmission of data only when the UE devices have the data to be transmitted. UE devices configured with shared SPS monitor PDCCH and apply different UE identifiers to the uplink scrambling, so that the eNB can identify uplink data from UE devices, respectively. 
         [0147]    Since the shared SPS scheme uses only a small part of the given resources, it is preferable that the scheme is applied to a small cell abundant in transmission resources. Therefore, the shared SPS scheme is used for a serving cell specified by an eNB, unlike general SPS schemes. 
         [0148]    The SPS is configured via RRC, and then activated or deactivated by using PDCCH. That is, when UE receives ‘0’ for the NDI value, along with SPS C-RNTI provided via RRC, the UE considers SPS to be activated. On the other hand, when a pre-defined value, e.g., all values, are set to ‘0,’ along with SPS C-RNTI, UE considers SPS to be deactivated. 
         [0149]    Alternatively, the SPS may also be deactivated by an implicit release. The implicit release refers to a scheme that enables UE to release the configured uplink grant when the transmission of MAC PDU without MAC SDU (hereafter called ‘Zero MAC SDU MAC PDU’) is performed successively a number of times, n, via an SPS transmission resource. The implicit release is introduced to provide against the loss of SPS release signals. 
         [0150]    However, when a shared SPS is applied, the implicit release needs to be ignored. This is because, when there is no data to be transmitted, MAC PDU without including MAC SDU needs not to be transmitted via a shared SPS resource, so that another UE can use the shared SPS resource. 
         [0151]    In some embodiments, when UE receives an RRCConnectionReconfiguration message, using IE defined in the form of ENUMERATED {SETUP}, named SkipUplinkTX, and SkipUplinkTX, indicated by SETUP, is contained in sps-ConfigUL or MAC-MainConfig of the received RRCConnectionReconfiguration message, the UE ignores the implicit release. 
         [0152]    When the shared SPS is activated or deactivated, the shared SPS scheme has a problem where the shared SPS scheme does not check whether UE correctly has received the activation (deactivation) signal. 
         [0153]    An existing SPS technology uses HARQ ACK/NACK; however, the shared SPS scheme does not uses HARQ ACK/NACK since SPS C-RNTI for the monitoring is an identifier commonly applied to a number of UE devices. Therefore, an additional device that differs from existing devices is required to increase the reception reliability of an activation (deactivation) signal. 
         [0154]    In some embodiments, when activating/deactivating a shared SPS, the transmission of regular buffer status report (BSR) to check whether UE has correctly received the activation (deactivation) signal is performed. The BSR is used to report an amount of data that UE needs to transmit to the eNB. When a BSR satisfies one of the following conditions, the BSR is reported to an eNB. 
         [0155]    A buffer status report (BSR) shall be triggered if any of the following events occur:
       UL data, for a logical channel which belongs to a LCG, becomes available for transmission in the RLC entity or in the PDCP entity (the definition of what data shall be considered as available for transmission is specified in [3] and [4] respectively) and either the data belongs to a logical channel with higher priority than the priorities of the logical channels which belong to any LCG and for which data is already available for transmission, or there is no data available for transmission for any of the logical channels which belong to a LCG, in which case the BSR is referred below to as “Regular BSR”;   UL resources are allocated and number of padding bits is equal to or larger than the size of the Buffer Status Report MAC control element plus subheader, in which case the BSR is referred below to as “Padding BSR”;   retxBSR-Timer expires and the MAC entity has data available for transmission for any of the logical channels which belong to a LCG, in which case the BSR is referred below to as “Regular BSR”;   periodicBSR-Timer expires, in which case the BSR is referred below to as “Periodic BSR”.       
 
         [0160]      FIG. 7  illustrates a flow diagram of operations between UE and eNB according to embodiment of the present invention. 
         [0161]    With reference to  FIG. 7 , a mobile communication system includes UE  705 , an eNB  710  and nodes. The UE  705  establishes RRC connection with the eNB  710  in operation  715 . 
         [0162]    Establishing RRC connection between UE  705  and the eNB  710  means a state/condition where a Signaling Radio Bearer (SRB) is configured between the UE  705  and the eNB  710  so that the UE  705  and eNB  710  can transmit/receive RRC control messages to each other. 
         [0163]    The RRC connection is established via a random access process in such a way that: UE  705  transmits an RRC connection establishment request message to the eNB  710 ; the eNB  710  transmits an RRC connection establishment message to the UE  705 ; and the UE  705  transmits an RRC connection establishment complete message to the eNB  710 . 
         [0164]    After establishing the RRC connection, the eNB  710  is capable of transmitting, to the UE  705 , a control message, UECapabilityEnquiry, instructing UE to report the UE capability, if the UE capability is necessary, in operation  720 . The control message contains the field of a radio access technology (RAT) type, indicating a capability regarding an RAT, from among the capabilities of UE. When the eNB  710  receives a report of a capability regarding EUTRA, the eNB  710  sets the RAT Type to EUTRA. 
         [0165]    When the UE  705  receives the UECapabilityEnquiry message where the RAT Type is set to EUTRA, the UE transmits, to the eNB  710 , a control message, UECapabilityInformation, containing the UE&#39;s capability for EUTRA in operation  725 . 
         [0166]    The control message contains UE-EUTRA-Capability. The UE-EUTRA-Capability contains a name list of features supported by UE, categories of UE (ue-Category), a combination of frequency bands supported by UE (supportedBandCombination), etc. UE supports a shared SPS function and has completed the inter-Operability Test for the function. The control message may contain IE representing that UE supports a shared SPS function. 
         [0167]    When the eNB  710  ascertains that the latency reduction needs to be applied to the UE  705 , it is capable of instructing the UE  705  to perform the RRC connection reconfiguration in operation  730 . The eNB  710  is capable of transmitting the shared SPS configuration information to the UE  705 , via the RRC connection reconfiguration message. The shared SPS configuration information is formed with SPS-Config information and SPS-Config-ext. 
         [0168]    Alternatively, in order to configure a shared SPS, Config-ext may be contained in the lower level information of sps-ConfigUL or MAC-MainConfig of an RRCConnectionReconfiguration message. The SkipUplinkTX may be contained in the lower level information of sps-ConfigUL or MAC-MainConfig or SPS-Config-ext. 
         [0169]    The structure of the SPS-Config is as follows. 
         [0000]    
       
         
               
               
             
               
               
             
               
               
             
               
             
               
               
               
             
               
               
             
               
               
             
               
               
             
           
               
                   
               
             
             
               
                 SPS-Config ::= SEQUENCE { 
                   
               
               
                  semiPersistSchedC-RNTI 
                 C-RNTI       OPTIONAL,   -- 
               
               
                 Need OR 
               
             
          
           
               
                  sps-ConfigDL 
                 SPS-ConfigDL   OPTIONAL,   -- Need ON 
               
               
                  sps-ConfigUL 
                 SPS-ConfigUL   OPTIONAL    -- Need ON 
               
               
                 } 
               
               
                 ... 
               
               
                 SPS-ConfigUL ::= CHOICE { 
               
               
                  release 
                 NULL, 
               
               
                  setup 
                 SEQUENCE { 
               
             
          
           
               
                   semiPersistSchedIntervalUL 
                  ENUMERATED { 
               
               
                   
                  sf10, sf20, sf32, sf40, sf64, sf80, 
               
               
                   
                  sf128, sf160, sf320, sf640, spare6, 
               
               
                   
                  spare5, spare4, spare3, spare2, 
               
               
                   
                  spare1}, 
               
               
                   implicitReleaseAfter 
                 ENUMERATED {e2, e3, e4, e8}, 
               
               
                   p0-Persistent 
                 SEQUENCE { 
               
               
                    p0-NominalPUSCH-Persistent 
                   INTEGER (−126..24), 
               
               
                    p0-UE-PUSCH-Persistent 
                   INTEGER (−8..7) 
               
             
          
           
               
                   }  OPTIONAL,                     -- Need OP 
               
             
          
           
               
                   twoIntervalsConfig 
                 ENUMERATED {true} 
                 OPTIONAL, 
               
               
                  -- Cond TDD 
               
               
                   ..., 
               
               
                   [[ p0-PersistentSubframeSet2-r12 
                  CHOICE { 
               
               
                     release 
                   NULL, 
               
               
                     setup 
                   SEQUENCE { 
               
             
          
           
               
                      p0-NominalPUSCH-PersistentSubframeSet2-r12 
                 INTEGER 
               
               
                 (−126..24), 
               
               
                      p0-UE-PUSCH-PersistentSubframeSet2-r2 
                 INTEGER (−8..7) 
               
               
                     } 
               
             
          
           
               
                    } 
                 OPTIONAL  -- Need 
               
               
                 ON 
               
               
                   ]] 
               
               
                  } 
               
               
                 } 
               
             
          
           
               
                 N1PUCCH-AN-PersistentList ::= 
                 SEQUENCE (SIZE (1..4)) OF INTEGER (0..2047) 
               
               
                  -- ASN1STOP 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
             
           
               
                   
               
               
                 SPS-Config field descriptions 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 implicitReleaseAfter 
               
               
                   
                 Number of empty transmissions before implicit release, see 
               
               
                   
                 TS 36.321 [6, 5.10.2]. Value e2 corresponds to 2 
               
               
                   
                 transmissions, e3 corresponds to 3 transmissions and so on. 
               
               
                   
                 n1PUCCH-AN-PersistentList, n1PUCCH-AN-PersistentListP1 
               
               
                   
                 List of parameter: n PUCCH   (1, p)  for antenna port P0 and for 
               
               
                   
                 antenna port P1 respectively, see TS 36.213 [23, 10.1]. 
               
               
                   
                 Field n1-PUCCH-AN-PersistentListP1 is applicable only if 
               
               
                   
                 the twoAntennaPortActivatedPUCCH-Format1a1b in 
               
               
                   
                 PUCCH-ConfigDedicated-v1020 is set to true. Otherwise the 
               
               
                   
                 field is not configured. 
               
               
                   
                 numberOfConfSPS-Processes 
               
               
                   
                 The number of configured HARQ processes for Semi-Persistent 
               
               
                   
                 Scheduling, see TS 36.321 [6]. 
               
               
                   
                 p0-NominalPUSCH-Persistent 
               
               
                   
                 Parameter: P O     —     NOMINAL     —      PUSCH  (0). See TS 36.213 [23, 5.1.1.1], 
               
               
                   
                 unit dBm step 1. This field is applicable for persistent 
               
               
                   
                 scheduling, only. If choice setup is used and p0-Persistent 
               
               
                   
                 is absent, apply the value of p0-NominalPUSCH for 
               
               
                   
                 p0-NominalPUSCH-Persistent. If uplink power control 
               
               
                   
                 subframe sets are configured by tpc-SubframeSet, this field 
               
               
                   
                 applies for uplink power control subframe set 1. 
               
               
                   
                 p0-NominalPUSCH-PersistentSubframeSet2 
               
               
                   
                 Parameter: P O     —     NOMINAL     —      PUSCH  (0). See TS 36.213 [23, 5.1.1.1], 
               
               
                   
                 unit dBm step 1. This field is applicable for persistent 
               
               
                   
                 scheduling, only. If p0-PersistentSubframeSet2-r12 is not 
               
               
                   
                 configured, apply the value of p0-NominalPUSCH-SubframeSet2- 
               
               
                   
                 r12 for p0-NominalPUSCH-PersistentSubframeSet2. E-UTRAN 
               
               
                   
                 configures this field only if uplink power control subframe 
               
               
                   
                 sets are configured by tpc-SubframeSet, in which case this 
               
               
                   
                 field applies for uplink power control subframe set 2. 
               
               
                   
                 p0-UE-PUSCH-Persistent 
               
               
                   
                 Parameter: P O     —     UE     —     PUSCH  (0). See TS 36.213 [23, 5.1.1.1], unit 
               
               
                   
                 dB. This field is applicable for persistent scheduling, 
               
               
                   
                 only. If choice setup is used and p0-Persistent is absent, 
               
               
                   
                 apply the value of p0-UE-PUSCH for p0-UE-PUSCH-Persistent. 
               
               
                   
                 If uplink power control subframe sets are configured by 
               
               
                   
                 tpc-SubframeSet, this field applies for uplink power 
               
               
                   
                 control subframe set 1. 
               
               
                   
                 p0-UE-PUSCH-PersistentSubframeSet2 
               
               
                   
                 Parameter: P O     —     UE     —     PUSCH  (0). See TS 36.213 [23, 5.1.1.1], unit 
               
               
                   
                 dB. This field is applicable for persistent scheduling, 
               
               
                   
                 only. If p0-PersistentSubframeSet2-r12 is not configured, 
               
               
                   
                 apply the value of p0-UE-PUSCH-SubframeSet2 for 
               
               
                   
                 p0-UE-PUSCH-PersistentSubframeSet2. E-UTRAN configures 
               
               
                   
                 this field only if uplink power control subframe sets are 
               
               
                   
                 configured by tpc-SubframeSet, in which case this field 
               
               
                   
                 applies for uplink power control subframe set 2. 
               
               
                   
                 semiPersistSchedC-RNTI 
               
               
                   
                 Semi-persistent Scheduling C-RNTI, see TS 36.321 [6]. 
               
               
                   
                 semiPersistSchedIntervalDL 
               
               
                   
                 Semi-persistent scheduling interval in downlink, see 
               
               
                   
                 TS 36.321 [6]. Value in number of sub-frames. Value sf10 
               
               
                   
                 corresponds to 10 sub-frames, sf20 corresponds to 20 
               
               
                   
                 sub-frames and so on. For TDD, the UE shall round this 
               
               
                   
                 parameter down to the nearest integer (of 10 sub-frames), 
               
               
                   
                 e.g. sf10 corresponds to 10 sub-frames, sf32 corresponds 
               
               
                   
                 to 30 sub-frames, sf128 corresponds to 120 sub-frames. 
               
               
                   
                 semiPersistSchedIntervalUL 
               
               
                   
                 Semi-persistent scheduling interval in uplink, see 
               
               
                   
                 TS 36.321 [6]. Value in number of sub-frames. Value sf10 
               
               
                   
                 corresponds to 10 sub-frames, sf20 corresponds to 20 
               
               
                   
                 sub-frames and so on. For TDD, the UE shall round this 
               
               
                   
                 parameter down to the nearest integer (of 10 sub-frames), 
               
               
                   
                 e.g. sf10 corresponds to 10 sub-frames, sf32 corresponds 
               
               
                   
                 to 30 sub-frames, sf128 corresponds to 120 sub-frames. 
               
               
                   
                 twoIntervalsConfig 
               
               
                   
                 Trigger of two-intervals-Semi-Persistent Scheduling in 
               
               
                   
                 uplink. See TS 36.321 [6, 5.10]. If this field is present, 
               
               
                   
                 two-intervals-SPS is enabled for uplink. Otherwise, 
               
               
                   
                 two-intervals-SPS is disabled. 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
               
             
           
               
                   
               
               
                 Conditional presence 
                 Explanation 
               
               
                   
               
             
             
               
                 TDD 
                 This field is optional present for TDD, need 
               
               
                   
                 OR; it is not present for FDD and the UE 
               
               
                   
                 shall delete any existing value for this field. 
               
               
                   
               
             
          
         
       
     
         [0170]    The structure of the SPS-Config-ext is as follows. 
         [0000]    
       
         
               
               
               
             
               
               
             
               
               
               
             
           
               
                   
                   
               
             
             
               
                   
                   SPS-Config-ext ::= SEQUENCE { 
                   
               
               
                   
                   semiPersistSchedC-RNTI2 
                 C-RNTI 
               
               
                   
                   OPTIONAL, 
               
             
          
           
               
                   
                   semiPersistSchedIntervalUL2ENUMERATED { 
               
               
                   
                   sf1, sf2, sf4, sf6, sf8, spare3, spare2, 
               
               
                   
                   spare1}, 
               
             
          
           
               
                   
                   logicalChannelIdList 
                 ... 
               
               
                   
                   SharedSPSenabledCell 
                   ServCellIndex 
               
               
                   
                 } 
               
               
                   
                 ... 
               
               
                   
                   
               
             
          
         
       
     
         [0171]    In summary, SPS-config is formed with the following IEs:
       First SPS C-RNTI (semiPersistSchedC-RNTI)   First interval (semiPersistSchedIntervalUL)   Automatic release parameter (semiPersistSchedC-RNTI)       
 
         [0175]    SPS-Config-ext is formed with the following IEs:
       Shared SPS indicator (SPS-Config-ext may serve as a shared SPS indicator or an additional indicator may be used)   Second SPS C-RNTI (semiPersistSchedC-RNTI2)   Second interval (semiPersistSchedIntervalUL2)   Logical channel list (logicalChannelIdList): a name list of logical channels capable of using a shared SPS   serving cell id (SharedSPSenabledCell): an identifier of a serving cell where a shared SPS is activated/employed   SkipUplinkTX: Implicit release is ignored when indicated by SETUP. (A corresponding IE may serve as a shared SPS indicator)       
 
         [0182]    The UE  705  monitors whether the SPS function is activated in operation  735 . The UE  705  monitors whether a general SPS and a shared SPS are activated, respectively. 
         [0183]    Setting a general SPS function to a UE device means that: only SPS-config is set to UE at a corresponding timing but SPS-config-ext is not set thereto. In this case, the UE has received an rrcConnectionReconfiguration message containing valid SPS-config from the eNB. The UE has not released the received SPS-config. The UE has not received the SPS-Config-ext. Although the UE received the SPS-Config-ext, the UE has already released the SPS-Config-ext. For example, when UE, not set with an SPS, receives an rrcConnectionReconfiguration control message that contains only SPS-config but does not contain SPS-Config-ext, rrcConnectionReconfiguration control message is set with a general SPS. 
         [0184]    Setting a shared SPS function to a UE device means that: SPS-config and SPS-config-ext are set to UE at a corresponding timing. In this case, the UE has received an rrcConnectionReconfiguration message containing valid SPS-config and valid SPS-Config-ext from the eNB. The UE has not released the received SPS-config and the received SPS-Config-ext. 
         [0185]    For example, when a UE, not set with an SPS, receives an rrcConnectionReconfiguration control message wherein SPS-config and SPS-Config-ext are contained, it means that the UE has been set with a shared SPS. 
         [0186]    A UE sets with a general SPS monitors PDCCH of PCell or PSCell (hereafter called SpCell) and determines whether SPS is activated. When the UE receives uplink grant through a first SPS C-RNTI via the PDCCH of SpCell, the UE monitors a new data indicator (NDI) of the uplink grant. When the NDI is ‘0’ and information regarding the PDCCH is not information specifying the release, the UE stores the uplink grant and the associated HARQ information as configured uplink grant and initiates the SPS operation.
       else, if this Serving Cell is the SpCell and if an uplink grant for this TTI has been received for the SpCell on the PDCCH of the SpCell for the MAC entity&#39;s Semi-Persistent Scheduling C-RNTI:   if the NDI in the received HARQ information is 1:   consider the NDI for the corresponding HARQ process not to have been toggled;   deliver the uplink grant and the associated HARQ information to the HARQ entity for this TTI.   else if the NDI in the received HARQ information is 0:   if PDCCH contents indicate SPS release:   clear the configured uplink grant (if any).   else:   store the uplink grant and the associated HARQ information as configured uplink grant;   initialize (if not active) or re-initialize (if already active) the configured uplink grant to start in this TTI and to recur according to rules in subclause 5.10.2 (according to semiPersistSchedIntervalUL);   consider the NDI bit for the corresponding HARQ process to have been toggled;   deliver the configured uplink grant and the associated HARQ information to the HARQ entity for this TTI.       
 
         [0199]    HARQ information: HARQ information for DL-SCH or for UL-SCH transmissions consists of New Data Indicator (NDI), Transport Block (TB) size. For DL-SCH transmissions the HARQ information also includes HARQ process ID. For UL-SCH transmission the HARQ information also includes Redundancy Version (RV). In case of spatial multiplexing on DL-SCH the HARQ information comprises a set of NDI and TB size for each transport block. HARQ information for SL-SCH and SL-DCH transmissions consists of TB size only. 
         [0200]    Via a PDCCH of a serving cell specified as SharedSPSenabledCell; or via a PDCCH of a scheduling cell of the serving cell (refer to the cell CrossCarrierSchedulingConfig which provides scheduling information regarding the serving cell) in a state where the cross-carrier scheduling is employed, when UE set with a shared SPS receives uplink grant through an SPS C-RNTI, the UE monitors an NDI of the uplink grant. When the NDI is ‘0’ and information regarding the PDCCH is not information specifying the release, UE stores the uplink grant and the associated HARQ information as configured uplink grant and initiates the shared SPS operation. 
         [0201]    The SPS C-RNTI for the monitoring may be first SPS C-RNTI or second SPS C-RNTI. The following operations are explained, assuming the second SPS C-RNTI.
       else, if this Serving Cell is the SharedSPSenabledCell and if an uplink grant for this TTI has been received for the SharedSPSenabledCell on the PDCCH of the SharedSPSenabledCell for the MAC entity&#39;s Semi-Persistent Scheduling C-RNTI2:   if the NDI in the received HARQ information is 1:   consider the NDI for the corresponding HARQ process not to have been toggled;   deliver the uplink grant and the associated HARQ information to the HARQ entity for this TTI.   else if the NDI in the received HARQ information is 0:   if PDCCH contents indicate SPS release:   clear the configured shared uplink grant (if any).   else:   store the uplink grant and the associated HARQ information as configured shared uplink grant;   initialize (if not active) or re-initialize (if already active) the configured shared uplink grant to start in this TTI and to recur according to semiPersistSchedIntervalUL2;   consider the NDI bit for the corresponding HARQ process to have been toggled;   deliver the configured shared uplink grant and the associated HARQ information to the HARQ entity for this TTI.       
 
         [0214]    In a general SPS operation, the SPS C-RNTI for monitoring an SPS activation signal is identical to the SPS C-RNTI for scrambling PUSCH. That is, UE monitors the PDCCH by using one SPS C-RNTI as a first SPS C-RNTI, and scrambles the uplink data. 
         [0215]    In a shared SPS operation, an SPS C-RNTI for monitoring PDCCH and an SPS C-RNTI for scrambling the uplink data are separated from each other. For example, PDCCH is monitored by a first SPS-CRNTI and PUSCH is scrambled by a second SPS C-RNTI. Alternatively, PDCCH is monitored by a second SPS-CRNTI and PUSCH is scrambled by a first SPS C-RNTI. These operations are separately performed because an SPS C-RNTI for the monitoring is an identifier which is commonly applied to a number of UE devices, and thus an eNB cannot identify, when uplink data is scrambled with the SPS C-RNTI for the monitoring, UE transmitting the uplink data. 
         [0216]    Therefore, an SPS C-RNTI for the uplink scrambling employs a UE specific SPS C-RNTI. That is, an eNB allocates the same value to an SPS C-RNT for the monitoring for a number of UE devices in a shared SPS. On the other hand, the eNB allocates unique values to SPS C-RNTIs for the scrambling for UE devices, respectively. 
         [0217]    Scrambling PUSCH by using an SPS C-RNTI is defined in the TS 36.212 and TS 36.213. 
         [0218]    When the UE  705  receives an uplink grant instructing the UE to initiate a general SPS operation or a shared SPS operation in operation  740 , the UE initiates a general SPS operation or a shared SPS operation in operation  745 . 
         [0219]    More specifically, when the NDI is ‘0,’ and PDCCH addressed by an SPS C-RNTI does not indicates an SPS release in operation  740 , the UE  705  activates an SPS for the indicated transmission resource on the PDCCH and transmits a regular BSR to the eNB. 
         [0220]    When the eNB  710  has not received the BSR for a pre-set period of time since the transmission of an SPS signal for the pre-scheduling, the eNB ascertains that the signal is lost. 
         [0221]    When a shared SPS is activated or deactivated to transmit a regular BSR, the present invention checks whether UE correctly receives an activation (deactivation) signal. Therefore, a condition for triggering an existing regular BSR is added as follows.
       SkipUplinkTx is configured and PDCCH addressed by SPS C-RNTI with NDI set to 0 is received, in which case the BSR is referred below to as “Regular BSR”.       
 
         [0223]    The present invention includes a new BSR trigger condition. That is, when a specified UE device is set with a shared SPS and receives PDCCH addressed by an SPS C-RNTI where the NDI is ‘0,’ the UE transmits a regular BSR to the eNB  710 . In an embodiment of the present invention, the following methods may be considered so that the eNB  710  can identify the regular BSR transmitted as an ACK in response to the shared SPS. 
         [0224]    1) A value of a buffer storing a BSR is set to a pre-defined value; 
         [0225]    2) The BSR is transmitted as a truncated BSR; or 
         [0226]    3) The BSR is transmitted in a newly defined BSR format. 
         [0227]    Based on the methods, the BSR may have Buffer Status (BS) index values as in the following table. Each index value represents a range of buffer size that UE needs to use in the transmission. A specified one of the values may be used for only the ACK of a shared SPS as shown in TABLE 3. 
         [0000]    
       
         
               
               
               
             
               
               
               
             
           
               
                   
                 TABLE 3 
               
               
                   
                   
               
               
                   
                   
                 Buffer Size (BS) value 
               
               
                   
                 Index 
                 [bytes] 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 0 
                 BS = 0    
               
               
                   
                 1 
                  0 &lt; BS &lt;= 10 
               
               
                   
                 2 
                 10 &lt; BS &lt;= 12 
               
               
                   
                 3 
                 12 &lt; BS &lt;= 14 
               
               
                   
                 4 
                 14 &lt; BS &lt;= 17 
               
               
                   
                 5 
                 17 &lt; BS &lt;= 19 
               
               
                   
                 6 
                 19 &lt; BS &lt;= 22 
               
               
                   
                 7 
                 22 &lt; BS &lt;= 26 
               
               
                   
                 8 
                 26 &lt; BS &lt;= 31 
               
               
                   
                 9 
                 31 &lt; BS &lt;= 36 
               
               
                   
                 10 
                 36 &lt; BS &lt;= 42 
               
               
                   
                 11 
                 42 &lt; BS &lt;= 49 
               
               
                   
                 12 
                 49 &lt; BS &lt;= 57 
               
               
                   
                 13 
                 57 &lt; BS &lt;= 67 
               
               
                   
                 14 
                 67 &lt; BS &lt;= 78 
               
               
                   
                 15 
                 78 &lt; BS &lt;= 91 
               
               
                   
                 16 
                  91 &lt; BS &lt;= 107 
               
               
                   
                 17 
                 107 &lt; BS &lt;= 125 
               
               
                   
                 18 
                 125 &lt; BS &lt;= 146 
               
               
                   
                 19 
                 146 &lt; BS &lt;= 171 
               
               
                   
                 20 
                 171 &lt; BS &lt;= 200 
               
               
                   
                 21 
                 200 &lt; BS &lt;= 234 
               
               
                   
                 22 
                 234 &lt; BS &lt;= 274 
               
               
                   
                 23 
                 274 &lt; BS &lt;= 321 
               
               
                   
                 24 
                 321 &lt; BS &lt;= 376 
               
               
                   
                 25 
                 376 &lt; BS &lt;= 440 
               
               
                   
                 26 
                 440 &lt; BS &lt;= 515 
               
               
                   
                 27 
                 515 &lt; BS &lt;= 603 
               
               
                   
                 28 
                 603 &lt; BS &lt;= 706 
               
               
                   
                 29 
                 706 &lt; BS &lt;= 826 
               
               
                   
                 30 
                 826 &lt; BS &lt;= 967 
               
               
                   
                 31 
                  967 &lt; BS &lt;= 1132 
               
               
                   
                 32 
                 1132 &lt; BS &lt;= 1326 
               
               
                   
                 33 
                 1326 &lt; BS &lt;= 1552 
               
               
                   
                 34 
                 1552 &lt; BS &lt;= 1817 
               
               
                   
                 35 
                 1817 &lt; BS &lt;= 2127 
               
               
                   
                 36 
                 2127 &lt; BS &lt;= 2490 
               
               
                   
                 37 
                 2490 &lt; BS &lt;= 2915 
               
               
                   
                 38 
                 2915 &lt; BS &lt;= 3413 
               
               
                   
                 39 
                 3413 &lt; BS &lt;= 3995 
               
               
                   
                 40 
                 3995 &lt; BS &lt;= 4677 
               
               
                   
                 41 
                 4677 &lt; BS &lt;= 5476 
               
               
                   
                 42 
                 5476 &lt; BS &lt;= 6411 
               
               
                   
                 43 
                 6411 &lt; BS &lt;= 7505 
               
               
                   
                 44 
                 7505 &lt; BS &lt;= 8787 
               
               
                   
                 45 
                  8787 &lt; BS &lt;= 10287 
               
               
                   
                 46 
                 10287 &lt; BS &lt;= 12043 
               
               
                   
                 47 
                 12043 &lt; BS &lt;= 14099 
               
               
                   
                 48 
                 14099 &lt; BS &lt;= 16507 
               
               
                   
                 49 
                 16507 &lt; BS &lt;= 19325 
               
               
                   
                 50 
                 19325 &lt; BS &lt;= 22624 
               
               
                   
                 51 
                 22624 &lt; BS &lt;= 26487 
               
               
                   
                 52 
                 26487 &lt; BS &lt;= 31009 
               
               
                   
                 53 
                 31009 &lt; BS &lt;= 36304 
               
               
                   
                 54 
                 36304 &lt; BS &lt;= 42502 
               
               
                   
                 55 
                 42502 &lt; BS &lt;= 49759 
               
               
                   
                 56 
                 49759 &lt; BS &lt;= 58255 
               
               
                   
                 57 
                 58255 &lt; BS &lt;= 68201 
               
               
                   
                 58 
                 68201 &lt; BS &lt;= 79846 
               
               
                   
                 59 
                 79846 &lt; BS &lt;= 93479 
               
               
                   
                 60 
                  93479 &lt; BS &lt;= 109439 
               
               
                   
                 61 
                 109439 &lt; BS &lt;= 128125 
               
               
                   
                 62 
                 128125 &lt; BS &lt;= 150000 
               
               
                   
                 63 
                 BS &gt; 150000 
               
               
                   
                   
               
             
          
         
       
     
         [0228]      FIG. 8  illustrates a format of a BSR according to embodiment of the present invention. 
         [0229]    The truncated BSR may have a format as follows. The format of the truncated BSR is 1 byte in size where the first two bits indicate an LCG ID value and the remaining six bits indicates a BS index value as described above in the table. When the remaining size of the MAC PDU is less than 4 bytes and thus a general padding BSR does not receive a Long BSR of 4 bits, the truncated BSR is used to transmit an LCG BS index value with the highest priority. The truncated BSR is identical in format to the short BSR. In an embodiment of the present invention, although the remaining size of the MAC PDU has space, when an eNB receives a BSR of 1 bit, the eNB considers the BSR to be the ACK of a shared SPS. 
         [0230]    It should be understood that the present invention is not limited to the BSR format shown in  FIG. 8  but may define various formats of BSR according to design specifications.
       In some embodiments of general SPS operation, a UE performs the uplink transmission, using an SPS resource, at a cycle of semiPersistSchedIntervalUL (a cycle included in the SPS-config) in SpCell, based on a sub-frame initiating an SPS operation. For example, UE ascertains that the N th  grant has been created in a lower sub-frame of an SpCell, and performs the uplink transmission by applying a corresponding grant to the sub-frame.   consider sequentially that the N th  grant occurs in the subframe for which:       
 
         [0000]      (10 *SFN +subframe)=[(10 *SFN   start time +subframe start time )+ N *semiPersistSchedInterval UL +Subframe_Offset*( N modulo2)]modulo10240. 
         [0233]    Where SFN start time  and subframe start time  are the SFN and subframe, respectively, at the time the configured uplink grant were (re-)initialised. 
         [0234]    Although the UE does not have data to be transmitted at a corresponding timing when transmitting an MAC PDU via the SPS resource, the UE creates and transmits a padding MAC PDU including BSR MAC CE and Padding MAC CE. The UE performs the scrambling for the uplink transmission by employing a first SPS C-RNTI. 
         [0235]    When only MAC PDU without MAC SDU is transmitted for a number of times, implicitReleaseAfter, the UE releases the configured uplink grant.
       In some embodiments of shared SPS operation, a UE performs the uplink transmission, using a shared SPS resource, at a cycle of semiPersistSchedIntervalUL2 (a cycle included in the SPS-config-ext) in the SharedSPSenabledCell, based on a sub-frame initiating an SPS operation. For example, the UE ascertains that the N th  grant has been created in a lower sub-frame of an SpCell, and performs the uplink transmission by applying a corresponding grant to the sub-frame.   consider sequentially that the N th  grant occurs in the subframe for which:       
 
         [0000]      (10 *SFN +subframe)=[(10 *SFN   start time +subframe start time )+ N *semiPersistSchedInterval UL 2]modulo10240. 
         [0238]    Where SFN start time  and subframe start time  are the SFN and subframe, respectively, at the time the configured shared uplink grant were (re-)initialised. 
         [0239]    Referring back to  FIG. 7 , when the UE  705  does not have ‘data that can be transmitted via a shared SPS transmission resource’ at a corresponding timing in transmitting MAC PDU via the SPS resource, the UE  705  does not perform the uplink transmission. When the UE  705  has transmittable data in operation  743 , the UE  705  performs the uplink transmission in operation  744 . 
         [0240]    Although only MAC PDU without MAC SDU has been transmitted for a number of times, implicitReleaseAfter, UE  705  does not release the configured uplink grant. The MAC PDU without MAC SDU refers to MAC PDU that contains only MAC CE but does not contain MAC SDU containing high layer data. 
         [0241]    The UE  705  performs the scrambling for the uplink transmission by employing an SPS C-RNTI that differs from an SPS C-RNTI used to monitor PDCCH. The SPS C-RNTI applied to the scrambling may be a C-RNTI of the UE  705 . That is, the identifier may be formed in various combinations as in the following table 4. 
         [0000]    
       
         
               
               
               
             
           
               
                   
                 TABLE 4 
               
               
                   
                   
               
               
                   
                 Identifier for monitoring 
                 Identifier for scrambling 
               
               
                   
                 PDCCH 
                 uplink 
               
               
                   
                   
               
             
             
               
                   
                 semiPersistSchedC-RNTI of 
                 semiPersistSchedC-RNTI2 of 
               
               
                   
                 SPS-config 
                 SPS-config-ext 
               
               
                   
                 semiPersistSchedC-RNTI2 of 
                 semiPersistSchedC-RNTI of 
               
               
                   
                 SPS-config-ext 
                 SPS-config 
               
               
                   
                 semiPersistSchedC-RNTI of 
                 C-RNTI allocated in the RRC 
               
               
                   
                 SPS-config 
                 connection configuration or 
               
               
                   
                   
                 C-RNTI of mobilityControlInfo 
               
               
                   
                   
               
             
          
         
       
     
         [0242]    The last case is a state where SPS C-RNTI 2 is not allocated in SPS-config-ext. In this case, UE performs the scrambling for the shared SPS uplink transmission, using the UE&#39;s C-RNTI as a UE specific identifier. 
         [0243]    As described above, a UE is capable of transmitting only data of a logical channel, logicalChannelIdList, via a shared SPS transmission resource. Although UE has data of other logical channels (e.g., RRC messages, etc.), except for the data of the logicalChannelIdList, the UE does not consider the data to be ‘data that can be transmitted via a shared SPS transmission resource’ but considers only data of a logical channel of the logicalChannelIdList to be ‘data that can be transmitted via a shared SPS transmission resource.’ 
         [0244]    When the UE  705  receives the uplink grant indicating the SPS release in operation  750 , the UE  705  terminates the SPS operation and releases the configured uplink grant or the configured shared uplink grant. 
         [0245]    More specifically, when the NDI is ‘0’ and PDCCH addressed by an SPS C-RNTI indicates the SPS release, the UE  705  deactivates the SPS for the indicated transmission resource on the PDCCH and transmits a regular BSR to the eNB  710  in operation  755 . 
         [0246]      FIG. 9  illustrates a flowchart of operations of UE according to embodiment of the present invention. 
         [0247]    When the UE has not received valid SPS-config, or, although the UE received valid SPS-config, the UE has already released the SPS-config, the UE receives a control message, RRCConnectionReconfiguration, in operation  905 . The UE determines whether the control message contains SPS-config and SPS-config-ext in operation  910 . 
         [0248]    When the UE ascertains that the control message contains only SPS-config in operation  910 , the UE performs operations related to a general SPS in operation  915 . When the UE ascertains that the control message contains both SPS-config and SPS-config-ext in operation  910 , the UE performs operations related to a shared SPS in operation  920  as shown in TABLE 5. 
         [0000]    
       
         
               
               
             
           
               
                 TABLE 5 
               
               
                   
               
               
                 Operations related to 
                 Operations related to 
               
               
                 general SPS 
                 shared SPS 
               
               
                   
               
             
             
               
                 Monitor PDCCH of SpCell 
                 Monitor PDCCH of 
               
               
                   
                 SharedSPSenabledCell 
               
               
                 Determine whether to receive 
                 Determine whether to receive an 
               
               
                 an uplink grant instructing 
                 uplink grant instructing to 
               
               
                 to initiate a general SPS 
                 initiate operations related to 
               
               
                 operation by using 
                 a shared SPS operation by using 
               
               
                 semiPersistSchedC-RNTI 
                 an identifier for monitoring 
               
               
                 allocated in SPS-config 
                 PDCCH 
               
               
                 Apply an SPS cycle to 
                 Apply an SPS cycle to 
               
               
                 semiPersistSchedIntervalUL 
                 semiPersistSchedIntervalUL2 of 
               
               
                 of SPS-config 
                 SPS-config-ext 
               
               
                 Scramble the transmission of 
                 Scramble the transmission of 
               
               
                 PUSCH via an SPS resource, 
                 PUSCH via an SPS resource, by 
               
               
                 by using 
                 using an ‘identifier for 
               
               
                 ‘semiPersistSchedC-RNTI 
                 uplink scrambling’ 
               
               
                 allocated in SPS-config’ 
               
               
                 Transmit uplink data via 
                 Transmit uplink data via PUSCH 
               
               
                 PUSCH of SpCell 
                 of SharedSPSenabledCell 
               
               
                 Transmit padding MAC PDU 
                 Omit the transmission when there 
               
               
                 when there is no data 
                 is no data available for 
               
               
                 available for transmission 
                 transmission 
               
               
                 Release an SPS transmission 
                 Maintain an SPS transmission 
               
               
                 resource when ‘MAC PDU 
                 resource although ‘MAC PDU 
               
               
                 without SDU’ is successively 
                 without SDU’ is successively 
               
               
                 transmitted a preset number of 
                 transmitted a preset number of 
               
               
                 times 
                 times 
               
               
                   
               
             
          
         
       
     
         [0249]    Alternatively, the UE may perform another operations as shown in TABLE 6. 
         [0000]    
       
         
               
               
             
           
               
                 TABLE 6 
               
               
                   
               
               
                 Operations related to 
                 Operations related to 
               
               
                 general SPS 
                 shared SPS 
               
               
                   
               
             
             
               
                 Monitor PDCCH of SpCell 
                 Monitor PDCCH of SpCell 
               
               
                 Monitor Dedicate Search 
                 Monitor Common Search Space of 
               
               
                 Space of SpCell PDCCH 
                 SpCell PDCCH 
               
               
                 Determine whether to 
                 Determine whether to receive 
               
               
                 receive uplink grant 
                 uplink grant instructing to 
               
               
                 instructing to initiate a 
                 initiate operations related 
               
               
                 general SPS operation by 
                 to a shared SPS operation by 
               
               
                 using semiPersistSchedC-RNTI 
                 using an identifier for 
               
               
                 allocated in SPS-config 
                 monitoring PDCCH 
               
               
                 The same as described above 
                 The same as described above 
               
               
                 The same as described above 
                 The same as described above 
               
               
                 The same as described above 
                 The same as described above 
               
               
                 The same as described above 
                 The same as described above 
               
               
                   
               
             
          
         
       
     
         [0250]    The UE receives PDCCH instructed by an SPS C-RNTI, and determines whether the NDI is set to ‘0’ in operation  925 . The UE determines whether the PDCCH instructs the SPS activation or deactivation (release) in operation  930 . 
         [0251]    When the UE ascertains that the PDCCH instructs the SPS activation in operation  930 , the UE activates the SPS for the transmission resource instructed by the PDCCH and transmits a regular BSR to the eNB in operation  935 . On the other hand, when the UE ascertains that the PDCCH instructs the SPS deactivation in operation  930 , the UE releases the SPS and transmits a regular BSR to the eNB in operation  940 . 
         [0252]      FIG. 10  illustrates a flowchart of operations of an eNB according to embodiment of the present invention. 
         [0253]    The eNB determines to configure a shared SPS to a specified UE device in operation  1000 . The eNB transmits an RRC connection reconfiguration message to the UE in order to configure a shared SPS to the UE in operation  1005 . The RRC message contains information required to configure a shared SPS. 
         [0254]    The eNB activates or deactivates the shared SPS by using PDCCH in operation  1010 . To this end, the PDCCH is addressed by an SPS C-RNTI where the NDI is a value of ‘0.’ After transmitting the PDCCH to the UE, the eNB determines whether the eNB receives a regular BSR from the UE for a specified period of time in operation  1015 . 
         [0255]    When the eNB receives a regular BSR from the UE before a specified period of time elapses in operation  1015 , the eNB considers that the UE has successfully received the activation (deactivation) signal in operation  1020 . In order to indicate that the regular BSR has the purpose of acknowledging failure or success of the reception of activation (deactivation) signal, the regular BSR may have a specified buffer status (BR) index value or a truncated BSR or a new BSR format may be used. When the eNB has not received a regular BSR from the UE in operation  1015 , the eNB considers that the UE has not activated or deactivated a shared SPS in operation  1025 . 
         [0256]    In some embodiments, an eNB enables to use a regular BSR on the uplink in order to determine whether UE has correctly received an activation (deactivation) signal of a shared SPS. 
         [0257]    In some embodiments, a new MAC CE to comply with the purpose described above is defined. For example, a newly defined MAC CE may be assigned a new uplink LCID that differs from that allocated to an existing MAC CE. The newly defined MAC CE has a sub-header containing the LCID, but does not have an MAC CE in the MAC payload of the MAC PDU (zero bits). 
         [0258]    The eNB transmits PDCCH to activate or deactivate a shared SPS, and then determines whether the LCID is contained in the sub-header of the specified MAC PDU for a specified period of time, x. When the eNB ascertains that the LCID is contained in the sub-header of the specified MAC PDU, the eNB considers that the UE has successfully received the PDCCH. 
         [0259]    As described above, Aforementioned embodiments are capable of increasing the reliability of an activation/release signal of the SPS for prescheduling during the latency reduction SI 
         [0260]    In some embodiments, a regular BSR is triggered when an activation/release signal of the SPS for prescheduling is received. 
         [0261]    A buffer status report (BSR) may be triggered if any of the following events occur:
       UL data, for a logical channel which belongs to an LCG, becomes available for transmission in the RLC entity or in the PDCP entity and either the data belongs to a logical channel with higher priority than the priorities of the logical channels which belong to any LCG and for which data is already available for transmission, or there is no data available for transmission for any of the logical channels which belong to an LCG, in which case the BSR is referred below to as “Regular BSR”;   UL resources are allocated and number of padding bits is equal to or larger than the size of the buffer status report MAC control element and a subheader, in which case the BSR is referred below to as “Padding BSR”;   retxBSR-Timer expires and the MAC entity has data available for transmission for any of the logical channels which belong to a LCG, in which case the BSR is referred below to as “Regular BSR”;   periodicBSR-Timer expires, in which case the BSR is referred below to as “Periodic BSR”.   SkipUplinkTx is configured and PDCCH addressed by SPS C-RNTI with NDI set to 0 is received, in which case the BSR is referred below to as “Regular BSR”.       
 
         [0267]    When an eNB has not received a BSR for a preset period of time since the transmission of a signal for the SPS for pre-scheduling, the eNB ascertains that the signal is lost. 
         [0268]    The aforementioned embodiments of the present invention operate as follows. 
         [0269]    Configure RRC connection with eNB; 
         [0270]    Receive an RRC connection reconfiguration message from an eENB; 
         [0271]    SPS configuration information; 
         [0272]    Pre-scheduling indicator; 
         [0273]    Monitor SPS C-RNTI in a serving cell; 
         [0274]    Receive NDI=0 and PDCCH addressed by SPS C-RNTI; and the SPS release is not indicated; 
         [0275]    Activate an SPS for an indicated transmission resource on the PDCCH and trigger a regular BSR; 
         [0276]    Transmit data using the SPS resource; 
         [0277]    Transmit transmittable data except for a padding BSR; otherwise, omit the transmission; 
         [0278]    Receive NDI=0 and PDCCH addressed by an SPS C-RNTI; and the SPS release is not indicated; 
         [0279]    Replace an existing SPS transmission resource with the newly indicated transmission resource and trigger a regular BSR; 
         [0280]    Transmit data using the SPS resource; 
         [0281]    Receive NDI=0 and PDCCH addressed by an SPS C-RNTI; and the SPS release is indicated; and 
         [0282]    Releases the SPS transmission resource and trigger a regular BSR. 
         [0283]    In some embodiments, a BRS is a regular BSR for the SPS ACK; e.g., BS is set to a specified value; a truncated BSR is transmitted; a new BSR format is defined, etc. 
         [0284]    In aforementioned embodiments, the cell selection and re-selection using a number of PMAX parameters are effectively performed. 
         [0285]    In aforementioned embodiments, the reliability of a semi-persistent scheduling (SPS) activation signal and an SPS deactivation signal in the shared SPS operation are increased. 
         [0286]    Although the present disclosure has been described with an exemplary embodiment, various changes and modifications may be suggested to one skilled in the art. It is intended that the present disclosure encompass such changes and modifications as fall within the scope of the appended claims.