JP2018064190A - User device and data transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique that allows a user device in a radio communication system to generate a data unit by using an appropriate data unit generation method and transmit the data unit.SOLUTION: A radio communication system includes a user device and a base station. The user device of the radio communication system includes: a determination unit that determines on the basis of a prescribed condition which process it will perform, a first process of performing a coupling process of coupling a plurality of first data units to generate a second data unit, and generating a transmission data unit including the second data unit as a payload, or a second process of generating the transmission data unit including the plurality of first data units as a payload without performing the coupling process; and a transmission unit for performing the first process or the second process determined by the determination unit and transmitting the transmission data unit to the base station.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a radio communication system having a user equipment and a base station.

  At present, in 3GPP (3rd Generation Partnership Project), a next-generation system called 5G, which is a successor of LTE (Long Term Evolution) -Advanced, which is one of the fourth generation radio communication systems, is in progress. In 5G, there are mainly three use cases of eMBB (extended Mobile Broadband), mMTC (massible Machine Type Communication), and URLLC (Ultra Reliability and Low Latency Communication).

  For example, URLLC aims to realize wireless communication with low delay and high reliability. As specific measures for realizing a low delay in URLLC, introduction of a Short TTI length (also referred to as a subframe length or a subframe interval), shortening of a control delay from packet generation to data transmission, and the like are being studied.

  In 5G, for example, a high-speed peak data rate such as 20 Gbps downstream and 10 Gbps upstream is a requirement (Non-Patent Document 1).

3GPP TR 38.913 V14.0.0 3GPP TS 36.321 V13.2.0 3GPP TS 36.322 V13.2.0 3GPP TS 36.323 V13.2.1

  In existing LTE (including LTE-Advanced), the radio interface protocol of the U-Plane (user plane) between the base station (eNB) and the user equipment (UE) is layer 1 (PHY) and layer 2 It is configured. Layer 2 includes MAC (Medium Access Control) (see Non-Patent Document 2), RLC (Radio Link Control) (see Non-Patent Document 3), and PDCP (Packet Data Convergence Protocol) (see Non-Patent Document 4). It consists of sub-layers. C-Plane is composed of the same protocol as U-Plane and RRC which is layer 3.

  Considering the requirements studied in 5G, high-speed processing is required for each layer 2 function. However, in the current LTE, since RLC concordation can be performed only after receiving UL grant, it takes time to generate RLC PDU, and as a result, it takes time to generate MAC PDU. In order to increase the processing speed, it is conceivable to generate a MAC PDU without performing RLC concatenation. In this case, overhead increases. It is desirable that the user apparatus can select an appropriate RLC PDU generation method according to the situation. Such a problem is a problem that may occur in the generation of data units of various layers, not limited to RLC.

  The present invention has been made in view of the above points, and enables a user apparatus in a wireless communication system to generate a data unit using an appropriate data unit generation method and transmit the data unit. The purpose is to provide technology.

According to the disclosed technology, the user apparatus in a wireless communication system including a user apparatus and a base station,
A first process for generating a second data unit by connecting a plurality of first data units to generate a transmission data unit including the second data unit as a payload, and without performing the connection process A determination unit that determines which one of the second processes for generating the transmission data unit including the plurality of first data units as a payload is to be performed based on a predetermined condition;
A user apparatus comprising: a transmission unit that executes the first process or the second process determined by the determination unit and transmits the transmission data unit to the base station.

  According to the technique of an indication, the technique which enables the user apparatus in a radio | wireless communications system to generate a data unit using the appropriate data unit generation method, and to transmit the said data unit is provided.

It is a block diagram of the radio | wireless communications system in embodiment of this invention. It is a figure which shows the structural example of the layer 2 in the user apparatus 10 (base station 20). It is a figure which shows the example of the data flow of LTE. It is a figure for demonstrating the operation example of the user apparatus 10 when not performing RLC connection. It is a figure for demonstrating the operation example of the user apparatus 10 in the case of performing RLC connection. It is a figure which shows the structural example of RLC PDU. FIG. 6 is a diagram for explaining an outline of an operation in the first embodiment. 6 is a flowchart illustrating an operation example of the user apparatus 10 according to the first embodiment. 6 is a flowchart illustrating an operation example of the user apparatus 10 according to the first embodiment. FIG. 10 is a diagram for explaining an operation example in the second embodiment. 3 is a functional configuration diagram of a user device 10. FIG. 2 is a functional configuration diagram of a base station 20. FIG. 2 is a hardware configuration diagram of a user apparatus 10 and a base station 20. FIG.

  Hereinafter, an embodiment (this embodiment) of the present invention will be described with reference to the drawings. The embodiment described below is only an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

  The wireless communication system according to the present embodiment is assumed to support at least the LTE communication method. Therefore, when the wireless communication system operates, an existing technology defined by LTE can be used as appropriate. However, the existing technology is not limited to LTE. In addition, “LTE” used in the present specification has a broad meaning including LTE-Advanced and LTE-Advanced and other systems unless otherwise specified. The present invention is also applicable to communication methods other than LTE.

  In the following description, terms such as MAC, RLC, and PDCP used in the existing LTE are used for convenience. Similar functions are referred to by other names. May be.

  In addition, the “data unit” in this specification may be referred to as “packet”, “frame”, “datagram”, or the like. Each of the PDUs and SDUs of each layer described below is an example of a “data unit”.

  In the following description, data units of a specific layer are targeted, but these are examples, and the present invention is not limited to the layer described in the embodiment, and can be applied to other layers. .

  In the following description, “greater than” may be replaced with “more than”. Further, “less than” or “less than” may be replaced with “below”.

(Whole system configuration)
FIG. 1 shows a configuration diagram of a wireless communication system according to the present embodiment (common to Examples 1 and 2). The radio communication system according to the present embodiment includes a user apparatus 10 and a base station 20, as shown in FIG. In FIG. 1, one user apparatus 10 and one base station 20 are shown, but this is an example, and there may be a plurality of each. Further, although the operation described below is described as the operation of the user apparatus 10, the base station 20 can perform the same operation as that of the user apparatus 10 regarding layer 2 (particularly, RLC connection ON / OFF control). is there.

(Configuration example of layer 2)
Regarding processing in layer 2 focused on in the present embodiment (common to both example 1 and example 2), user apparatus 10 performs processing described below based on the operation of layer 2 defined by LTE. First, the basic functional configuration of layer 2 included in the user apparatus 10 will be described with reference to FIG. The PDCP sublayer (or PDCP layer) may be referred to as a PDCP entity or a PDCP processing unit. The RLC sublayer (or RLC layer) may be referred to as an RLC entity or an RLC processing unit. The MAC sublayer (or MAC layer) may be referred to as a MAC entity or a MAC processing unit.

<PDCP>
On the transmission side indicated by Tx (for example, transmission from the user apparatus 10 to the base station 20), header compression processing (ROHC) and concealment processing (security) of the IP packet are performed in the PDCP sublayer, and PDCP PDU is performed in the RLC sublayer. Is passed. On the receiving side indicated by Rx, processing such as header restoration, deciphering, and integrity check corresponding to the transmitting side is performed. Also, at the time of handover, packet data is avoided by retransmitting unacknowledged user data on the transmission side, and duplication detection and order correction are performed on the reception side.

<RLC>
In the RLC sublayer, there are three modes of AM (acknowledged mode), UM (acknowledged mode), and TM (Transparent mode). On the transmission side of RLC-AM / UM, the TB size for each TTI is obtained by performing segmentation and concatenation of PDCP PDUs based on the total size of RLC PDU (s) notified from the MAC layer. RLC PDU corresponding to the above is generated and passed to the MAC sublayer. On the receiving side, PDCP PDU reconstruction is performed.

  In RLC-AM, ARQ control is performed in which the transmission side retransmits the RLC PDU based on a delivery confirmation signal (STATUS PDU) from the reception side. Further, on the RLC-AM / UM reception side, duplicate detection and order correction are further performed.

<MAC>
Shared channel resources are scheduled in the MAC sublayer. That is, on the downlink, the scheduler of the base station 20 determines which bearer RLC PDU for which user apparatus is multiplexed and transmitted on the TB (transport block). In the uplink, the scheduler of the base station 20 determines which user apparatus is to transmit data on the PUSCH (physical uplink shared channel), and the user apparatus 10 determines which bearer's RLC PDU is multiplexed on the TB. . The transmitting side MAC entity and the receiving side MAC entity transmit the TB using HARQ, and the receiving side extracts the RLC PDU from the TB and passes it to the RLC entity.

  FIG. 3 shows an example of data flow in PDCP, RLC, MAC, and PHY. As shown in FIG. 3, the PDU is passed from the upper layer to the lower layer on the transmitting side, and the SDU is passed from the lower layer to the upper layer on the receiving side.

  In particular, in the RLC layer, a plurality of RLC SDUs in the same bearer are concatenated, and in the MAC layer, RLC PDUs of different bearers are multiplexed, and processing equivalent to concatenation is performed.

(Basic processing operation in the present embodiment)
As described above, 5G requires a high peak data rate to be realized, and high-speed processing is required for each functional unit of the PDCP layer / RLC layer / MAC layer that transmits U-plane data.

  In particular, the RLC layer concatenation in the user apparatus 10 can be performed only after the UL grant is received and the size of the transmittable data (TB size) is determined. That is, it is determined whether or not the concatenation needs to be performed based on the transmittable TB size, and the RLC PDU generated by the concatenation process including the RLC header generation is sent to the MAC layer. As described above, when RLC layer concatenation is performed, it takes time from receiving UL grant until RLC PDU can be transmitted by MAC PDU, and there is a possibility that peak data rate assumed in 5G cannot be achieved.

  Therefore, in the present embodiment, the user apparatus 10 can multiplex RLC PDUs into the payload of the MAC PDU without performing RLC connection. By not performing RLC concatenation, it is possible to generate an RLC PDU by creating an RLC header before receiving UL grant.

  However, if the RLC connection is not performed, the processing speed can be improved, but the overhead of the MAC header increases as will be described later. Therefore, when the wireless quality is poor and the amount of data that can be transmitted wirelessly is limited, a method that does not perform RLC connection is not preferable.

  On the other hand, when RLC coordination is performed as in the conventional LTE, the overhead of the MAC header is small, so that it is effective when the wireless quality is poor and the amount of data that can be transmitted is limited. However, when the wireless quality is high and high-speed transmission is possible with PHY, the processing speed becomes a bottleneck as described above, and the method of performing RLC coordination is not preferable.

  Therefore, in the present embodiment, when the first predetermined condition is satisfied, the user apparatus 10 does not perform RLC concatenation (referred to as “OFF”), and the second predetermined condition is satisfied. In this case, RLC connection is performed (referred to as “ON”).

  The first predetermined condition is, for example, that the wireless quality is equal to or higher than a certain threshold A (good) and / or the amount of data to be transmitted is equal to or larger than a certain threshold B. The second predetermined condition is, for example, that the wireless quality is less than the threshold value B (not good) and / or the amount of data to be transmitted is less than the threshold value B.

<Example of operation when RLC connection is OFF>
An operation example (operation for UL data transmission in the user apparatus 10) in the RLC layer and the MAC layer of the user apparatus 10 when the RLC connection is OFF will be described with reference to FIG.

  In the example of FIG. 4, the user apparatus 10 generates PDCP PDUs 1 to 3 of bearer 1 (identified by LCID1 in the MAC layer) and PDCP PDUs 1 to 2 of bearer 2 (identified by LCID2 in the MAC layer). Is generated. For convenience, a MAC SDU including PDCP PDU1 is referred to as MAC SDU1. The same applies to PDCP PDUs 2 and 3.

  The user apparatus 10 generates each RLC PDU by attaching an RLC header to each PDCP PDU regardless of whether or not the UL grant is received (that is, before receiving the UL grant). And passed to the MAC layer as a MAC SDU. Until the user apparatus 10 receives the UL grant, the MAC SDU is stored in a buffer (storage unit) of the MAC layer, for example.

  After that, when the user apparatus 10 receives the UL grant and determines the TB size based on the resource information included in the UL grant, the user apparatus 10 acquires the MAC SDU from the buffer and multiplexes the MAC SDU in the MAC layer. By doing so, a TB-sized MAC PDU is generated.

  Until the user apparatus 10 receives the UL grant, the RLC PDU is stored in the buffer (storage unit) of the RLC layer, and when the TB size is obtained by receiving the UL grant, the RLC PDU is converted into the MAC layer as the MAC SDU. And a MAC PDU may be generated.

  In the example of FIG. 4, the MAC payload includes “MAC SDU 1 of bearer 1, MAC SDU 2 of bearer 1, MAC SDU 3 of bearer 1, 2 MAC SDU1 and bearer 2 MAC SDU2 "are stored in this order. Also, the MAC header corresponding to the MAC SDU is stored in the MAC header area in the same order as the order of the MAC SDU in the MAC payload. Note that “L1” or the like in the MAC header indicates the length (size) of the corresponding MAC SDU. Then, the user apparatus 10 transmits the data of MAC PDU by radio | wireless using PUSCH.

<Example of operation when RLC connection is ON>
An example of operation in the RLC layer and MAC layer of the user apparatus 10 when RLC connection is ON (operation for UL data transmission in the user apparatus 10) will be described with reference to FIG. In the present embodiment, the operation when the RLC connection is ON is the same as the operation in the existing LTE. However, the operation when RLC connection is ON may be different from the operation in the existing LTE.

  In the example of FIG. 5, the user apparatus 10 generates PDCP PDUs 1 to 3 of bearer 1 (identified by LCID 1 in the MAC layer) and PDCP PDUs 1 to 2 of bearer 2 (identified by LCID 2 in the MAC layer). Is generated. These PDCP PDUs (RLC SDUs) are temporarily stored in a buffer in the user apparatus 10.

  After the user apparatus 10 receives the UL grant and the total size of the RLC PDU (s) is determined, the user apparatus 10 performs concurrency of PDCP PDU (RLC SDU) for each bearer as shown in FIG. To generate an RLC PDU for each bearer. Then, the user apparatus 10 passes each RLC PDU as a MAC SDU to the MAC layer, and the MAC PDU is generated in the MAC layer.

  In the example of FIG. 5, “MAC SDU of bearer 1 (concatenation of PDCP PDUs 1 to 3) and MAC SDU of bearer 2 (concatenation of PDCP PDUs 1 to 2)” are stored in this order in the MAC payload. Also, the MAC header corresponding to the MAC SDU is stored in the MAC header area in the same order as the order of the MAC SDU in the MAC payload.

  For reference, FIG. 6 shows an example of an RLC PDU (here, an AMD PDU which is a PDU of RLC-AM) (Non-Patent Document 3). D / C in the header means Data or Control, and indicates whether this RLC PDU is a Data PDU or a Control PDU. RF is a Re-segmentation Flag and indicates whether this RLC PDU is an AMD PDU or an AMD PDU segment. P is a polling bit, which indicates the presence or absence of a STATUS report request. FI is Frame Info and indicates whether the first / last bit of Data is the first / last of the SDU. E is an extension bit, and indicates whether a pair of E and LI or Data follows. SN is a Sequence Number, which is a serial number assigned to each PDU.

  LI is a Length Indicator, and indicates a boundary of RLC SDUs in a data field (which may be called a payload). That is, LI indicates the length (data size) of the corresponding RLC SDU in the data field. In the RLC layer on the transmission side, the user apparatus 10 (base station 20) uses the LI so that the boundary of the RLC SDUs (concatenated) in the RLC layer on the reception side can be recognized when performing the concatenation. The length of the SDU is notified in the RLC header.

<Comparison between RLC connection OFF and ON>
When RLC connection is OFF, the processing speed is improved as described above, but the overhead of the MAC header is increased as compared with the case where RLC connection is ON. In the case where the same amount of data (RLC SDU) is transmitted, the total MAC PDU length is longer in the case of OFF than in the case of ON.

  On the other hand, when the RLC connection is ON, the overhead of the MAC header is smaller than when the RLC connection is OFF, and the MAC PDU length is also small. However, when ON, the RLC connection can be performed only after receiving UL grant. Therefore, as the data rate increases, the processing speed becomes a bottleneck.

  Therefore, in the present embodiment, the user apparatus 10 appropriately switches between RLC connection ON and OFF. Hereinafter, examples of more specific processing operations in the present embodiment will be described as Example 1 and Example 2.

Example 1
When the user apparatus 10 receives UL grant from the base station 20, the user apparatus 10 is notified of transmission opportunity from the MAC layer to the RLC layer, and at the same time, RLC PDU (s) that can be transmitted from the MAC layer to the RLC layer. The total size of is notified. This total size is a value determined based on the TB size determined from the resource information in UL grant. The total size may be a TB size. Further, the total size of RLC PDU (s) may be determined by the MAC layer, or the RLC layer may be determined based on the TB size upon receiving the TB size notification from the MAC layer. Note that the notification of the total size of the RLC PDU (s) is performed both when the RLC connection is ON and when it is OFF.

  The user apparatus 10 averages the total size of the RLC PDU (s) in a certain cycle, and when the averaged RLC PDU (s) is larger than a predetermined threshold, the user device 10 turns off the RLC connection and sets the total size. Is smaller than the predetermined threshold value, RLC connection is turned ON. When the total size of the RLC PDU (s) is the same as the predetermined threshold, for example, it may not be switched on / off, or may be determined to be switched on or off. Good.

  The predetermined threshold is a value transmitted from the base station 20 to the user apparatus 10 by, for example, system information or RRC signaling for individual radio setting.

  In the present embodiment, the determination of RLC connection ON / OFF including the averaging process is performed in the RLC layer, but this is only an example. The above averaging process and determination of RLC connection ON / OFF may be performed in a layer other than the RLC layer. Also in other examples, the determination of RLC connection ON / OFF may be performed in the RLC layer or in another layer.

  An example of operation will be described with reference to FIG. In FIG. 7, the user apparatus 10 performs the averaging process and determines ON / OFF of the RLC connection every time UL grant is received from the base station 20 (example: S101, S104).

  For example, it is assumed that RLC connection is OFF in the period before S103 in FIG. Then, for example, as a result of the deterioration of radio quality and a decrease in allocated resources slightly before the time of S103, the average value of the total size of RLC PDU (s) becomes smaller than a predetermined threshold at the time of S103. If so, the user apparatus 10 switches RLC continuation from OFF to ON. Note that the timing of switching from OFF to ON (start timing of processing after switching) may be the timing of the UL grant at which the result of ON is obtained, or may be the timing next to the UL grant. In addition, switching may be performed when the determination result of RLC connection ON continues for a predetermined number of UL grants. Further, switching may be performed when the determination result of RLC connection ON is continued for a predetermined time.

  After the time of S103, the operation of RLC connection ON is executed.

  The above is an example, and an operation as shown in parentheses in FIG. 7 may be performed. In this case, RLC connection ON is performed in the period before S103 in FIG. Then, for example, as a result of the radio quality being improved and the allocated resources increased slightly before the time of S103, the average value of the total size of RLC PDU (s) is larger than a predetermined threshold value at the time of S103. If it becomes, the user apparatus 10 switches RLC connection from ON to OFF. Then, after the time of S103, the operation of RLC connection OFF is executed. Note that the timing of switching from ON to OFF (start timing of processing after switching) may be the timing of UL grant at which the result of OFF is obtained, or may be the timing next to the UL grant. In addition, switching may be performed when the determination result of RLC connection OFF continues for a predetermined number of UL grants. Further, switching may be performed when the determination result of RLC connection OFF continues for a predetermined time.

<Example of averaging process>
The averaging process described above is performed by, for example, totaling RLC PDU (s) from the past time point that is back by a certain length of time (average period: T msec) from the current time point (the latest UL grant reception time point). This is a process for calculating the average size. For example, if there are 10 UL grant receptions in the averaging interval, the total size is 100 times, the total size is 200 times, and the total size is 200 times, the average is calculated as 150. The value of the averaging section is a value transmitted from the base station 20 to the user apparatus 10 by system information, RRC signaling for individual radio setting, or the like, for example. In addition, the user device 10 may perform the averaging calculation and the ON / OFF determination every time UL grant is received, or may be performed at a predetermined time interval. The predetermined time interval may be the averaging interval.

  Further, the user device 10 may perform an averaging process using a forgetting factor. In this case, for example, the RLC layer of the user apparatus 10 performs an averaging process using the forgetting factor every time the transmission opportunity notification (and the total size of the RLC PDU (s)) is received from the MAC layer. The forgetting factor is a value instructed from the base station 20, for example. Then, the RLC layer of the user apparatus 10 compares the value obtained by the averaging process with a predetermined threshold value, and determines RLC concurrency ON / OFF as described above.

The calculation using the forgetting factor can be performed by, for example, Expression 1: “X _n = (1−α) × X _n−1 + α × M _n ” (n is an integer of 1 or more). This may be called a moving average process using a forgetting factor. In Equation 1, _Xn is an average value up to the nth (n-th) sample, _Xn-1 is an average value up to (n-1) samples, and _Mn is the nth (n-th) sample. It is a measured value (total size) in a sample, and α (a real number between 0 and 1) is a forgetting factor.

  In any case of the averaging process using the averaging interval and the averaging process using the forgetting factor, Time-to-Trigger and / or hysteresis may be added.

  An example of the operation of the user device 10 will be described with reference to the flowchart of FIG. In the example illustrated in FIG. 8, the user apparatus 10 repeatedly executes the process between A and B every time the RLC PDU total size is notified from the MAC layer to the RLC layer.

  Immediately before step S201, the user apparatus 10 receives UL grant from the base station 20, and the RLC layer receives a notification of the RLC PDU total size from the MAC layer. In step S <b> 201, the user apparatus 10 performs a data transmission process with RLC contination ON or OFF based on the previous determination result (determination result when receiving the previous UL grant).

  In step S202, the user apparatus 10 calculates the average of the RLC PDU total size (performs averaging processing) using the current RLC PDU total size (and the previous value). In step S203, the user apparatus 10 compares the averaged RLC PDU total size with a predetermined threshold, and determines whether the averaged RLC PDU total size is larger than the predetermined threshold. If the determination result in step S203 is Yes, the process proceeds to step S204. If the determination result in step S203 is No, the process proceeds to step S205.

  In step S204, the user apparatus 10 determines to turn off RLC connection. In this case, if the current RLC connection is ON, the RLC connection is switched OFF in the data transmission process at the next UL grant reception. Also, if the current RLC connection is OFF, the process is performed while the RLC connection is OFF in the data transmission process at the next UL grant reception.

  In step S205, the user apparatus 10 determines that the RLC connection is to be turned ON. In this case, if the current RLC connection is OFF, the RLC connection is switched OFF in the data transmission process at the next UL grant reception. If the current RLC connection is ON, the process is performed while the RLC connection is ON in the data transmission process at the next UL grant reception.

  In the example described above, the total size of the RLC PDU (s) is used. However, this is an example of the data size that can be transmitted, and other data sizes may be used. For example, a TB size that is a source of the total size of RLC PDU (s) may be used.

  Further, the user apparatus 10 may determine ON / OFF of the RLC connection by using a value other than the transmittable data size as described above. For example, the user apparatus 10 may determine ON / OFF of the RLC connection based on the data amount (buffer retention amount) that stays in the UL data buffer. The buffer may be a PDCP SDU buffer, a PDCP PDU buffer, an RLC SDU buffer, an RLC PDU buffer, a MAC SDU buffer, or another data buffer. Good. Further, the total amount of data staying in a plurality of buffers may be used as the “data amount staying in the buffer”.

  For example, when the amount of data staying in the buffer is larger than a predetermined threshold (for example, when the wireless quality is bad and the amount of data transmission is small), the user apparatus 10 turns on RLC connection and the amount of data staying in the buffer Is smaller than a predetermined threshold value (for example, when the radio quality is good), RLC connection is turned OFF. The comparison with the threshold value of the amount of data staying in the buffer and the ON / OFF determination of RLC concurrency may be performed at a predetermined time interval, or may be performed every time UL grant is received. It may be performed at the timing. The predetermined threshold is, for example, a value notified from the base station 20 to the user apparatus 10.

  With reference to FIG. 9, the operation example of the user apparatus 10 when using the data amount staying in the buffer will be described.

  In step S301, the user apparatus 10 determines whether the amount of data staying in the buffer is greater than a predetermined threshold (step S301). If the determination result in step S301 is Yes, the process proceeds to step S302. If the determination result in step S301 is No, the process proceeds to step S303.

  In step S302, the user apparatus 10 determines that RLC connection is ON. In this case, if the current RLC connection is OFF, the RLC connection is switched ON in the data transmission process at the next UL grant reception. If the current RLC connection is ON, the process is performed while the RLC connection is ON in the data transmission process at the next UL grant reception.

  In step S303, the user apparatus 10 determines that the RLC connection is OFF. In this case, if the current RLC connection is ON, the RLC connection is switched OFF in the data transmission process at the next UL grant reception. Also, if the current RLC connection is OFF, the process is performed while the RLC connection is OFF in the data transmission process at the next UL grant reception.

  Further, the user apparatus 10 may determine ON / OFF of the RLC connection using values other than the transmittable data size and the buffer retention amount as described above. For example, the user apparatus 10 may determine ON / OFF of RLC connection based on a value representing the radio quality. The values are, for example, CQI (Channel Quality Indicator), RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), and RS-SINR (signied Ref. one or more of (interference ratio).

  For example, when the value indicating the radio quality is smaller than a predetermined threshold (for example, when the radio quality is worse than the threshold), the user apparatus 10 turns on RLC connection, and the value indicating the radio quality is lower than the predetermined threshold. Is larger (eg, when the radio quality is better than the threshold value), RLC concration is set to OFF. The comparison of the value representing the wireless quality with the threshold value and the ON / OFF determination of the RLC connection may be performed at a predetermined time interval, may be performed every time UL grant is received, or other timings may be used. It is good also to do in. The predetermined threshold is, for example, a value notified from the base station 20 to the user apparatus 10.

  In each process described above, a parameter such as a threshold for determining ON / OFF of RLC connection may be set for each UE (for each user apparatus), or for each bearer of each user apparatus (for each RLC entity). May be set for each cell, or may be set in other units.

(Example 2)
Next, Example 2 will be described. In the second embodiment, the user apparatus 10 determines ON or OFF of RLC Connection in accordance with an instruction from the NW (base station 20) (may be referred to as setting information). For example, as illustrated in FIG. 10, in step S401, the user apparatus 10 receives an RLC Connection ON / OFF instruction from the base station 20. In step S402, the user apparatus 10 turns RLC Connection on or off according to the instruction.

  The signal used for the instruction in step S401 is not limited to a specific signal. For example, the instruction can be performed by a DL physical control channel (that is, UL grant), MAC CE, RLC control PDU, or PDCP control PDU.

  In addition, ON / OFF of RLC connection may be set for each UE (for each user apparatus), may be set for each bearer (for each RLC entity) of each user apparatus, or may be set for each cell. Alternatively, it may be set in other units.

  Instead of explicitly instructing RLC Connection ON / OFF from the base station 20 to the user apparatus 10 as described above, according to the setting contents from the base station 20 to the user apparatus 10, the user apparatus 10 may perform RLC Connection ON / OFF determination. That is, the base station 20 may implicitly instruct the user apparatus 10 to perform RLC Connection ON / OFF.

  For example, the user apparatus 10 determines RLC Connection ON / OFF according to the communication bandwidth specified by the base station 20. The communication bandwidth is a UL communication bandwidth. However, when the same communication bandwidth is used for UL and DL, the communication bandwidth specified by the base station 20 may be the DL communication bandwidth. Further, the communication bandwidth may be designated by broadcast of system information from the base station 20 to the user apparatus 10, or may be designated by individual signaling (RRC, MAC, or PHY). Further, the communication bandwidth used for the determination uses the communication bandwidth when a single carrier communication bandwidth is set, and when a plurality of carriers (cells) are set like CA. The sum of the bandwidths of a plurality of carriers may be used.

  As an example, when the communication bandwidth is smaller than a predetermined threshold, the user apparatus 10 turns on RLC concurrence, and when the communication bandwidth is larger than a predetermined threshold, turns off RLC continuation.

  In addition, when the communication bandwidth is a certain specific value A, the user apparatus 10 turns on RLC concurrence, and when the communication bandwidth is another specific value B (> A), the RLC continuation is turned off. It is good.

  Moreover, the user apparatus 10 may determine ON / OFF of RLC concordation based on the TTI length, the subframe length, or the OFDM symbol length used by the user apparatus 10 in the cell (carrier) in which the user apparatus 10 is located. For example, the TTI length, the subframe length, or the OFDM symbol length is notified from the base station 20 to the user apparatus 10 as setting information.

  For example, when the TTI length (or the subframe length or the OFDM symbol length) is smaller than a predetermined threshold, the user apparatus 10 turns off RLC connection and sets the TTI length (or the subframe length or the OFDM symbol length). ) Is larger than a predetermined threshold value, RLC connection is turned ON.

  Further, when the TTI length (or the subframe length or the OFDM symbol length) is a specific value A, the user apparatus 10 turns off the RLC connection and sets the TTI length (or the subframe length or the OFDM symbol). The RLC connection may be set to ON when the (long) is another specific value B (> A).

  Moreover, the user apparatus 10 may determine RLC connection ON / OFF for the bearer based on the QoS of the bearer set from the base station 20 with respect to the user apparatus 10. For example, RLC connection ON / OFF may be predetermined for each QoS. The user apparatus 10 holds correspondence information indicating the relationship between QoS and RLC connection ON / OFF, and determines RLC connection ON / OFF for the bearer based on the correspondence information. As an example, the user apparatus 10 turns off RLC continuation for a bearer of a service (QoS) requiring low delay (lower than a predetermined value). Further, the user apparatus 10 may determine RLC concurrency ON / OFF for the bearer according to the value of the PDCP Discard timer specified from the base station 20 for the bearer.

  For example, when the value of the PDCP Discard timer is smaller than a predetermined threshold (when a low delay is required), the user apparatus 10 sets the RLC connection to OFF and the value of the PDCP Discard timer is larger than the predetermined threshold And RLC connection is set to ON.

  Moreover, the user apparatus 10 may determine RLC connection ON / OFF according to the connected base station. For example, the user apparatus 10 receives RAT, service, 3GPP release, or information indicating that a specific function is supported from the connected base station (these are collectively referred to as base station information). To do. The user apparatus 10 holds correspondence information between base station information and RLC connection ON / OFF in advance, and the user apparatus 10 determines RLC connection ON / OFF based on the base station information and the correspondence information.

  In addition, you may implement combining Example 1 and Example 2. FIG. For example, when the user apparatus 10 determines that RLC connection is OFF (or ON) in the second embodiment, the user apparatus 10 performs RLC connection OFF (or ON) when the RLC connection is OFF (or ON) in the mechanism of the first embodiment. It may be carried out.

  As described above, according to the technology according to the present embodiment, RLC connection ON is selected when the communication state is suitable for RLC connection ON, and RLC connection OFF is selected when the communication state is suitable for RLC connection OFF. Therefore, efficient data communication suitable for the communication state can be performed.

(Device configuration)
A functional configuration example of the user apparatus 10 and the base station 20 that execute the operation of the present embodiment described above will be described. Each of the user apparatus 10 and the base station 20 may have only the function of the first embodiment regarding the layer 2, or may have only the function of the second embodiment, and the function and the embodiment of the first embodiment. It is good also as including both of 2 functions. Hereinafter, it is assumed that each of the user apparatus 10 and the base station 20 includes both the functions of the first embodiment and the second embodiment unless otherwise specified.

<User device>
FIG. 11 is a diagram illustrating an example of a functional configuration of the user device 10. As illustrated in FIG. 11, the user apparatus 10 includes a signal transmission unit 101, a signal reception unit 102, a layer 2 processing unit 103, and an upper layer processing unit 104. The layer 2 processing unit 103 includes a buffer 113. The functional configuration shown in FIG. 11 is merely an example. As long as the operation according to the present embodiment can be executed, the function classification and the name of the function unit may be anything. For example, the layer 2 processing unit 103 may be divided into a reception side and a transmission side, the transmission side layer 2 processing unit may be included in the signal transmission unit 101, and the reception side layer 2 processing unit may be included in the signal reception unit 102.

  The signal transmission unit 101 corresponds to a function unit of a physical layer on the transmission side, and is configured to wirelessly transmit a signal passed from the layer 2 processing unit 103. The signal receiving unit 102 corresponds to a function unit of the physical layer on the receiving side, and is configured to wirelessly receive various signals and pass the received signals to the layer 2 processing unit 103.

  The layer 2 processing unit 103 includes the configuration of the layer 2 described with reference to FIG. 2 as a basic configuration, and the processing function in the layer 2 described in the first embodiment and the processing function of the layer 2 described in the second embodiment. Have.

  Further, for example, the layer 2 processing unit 103 generates a second data unit (for example, RLC PDU) by performing a concatenation process for concatenating a plurality of first data units (for example, RLC SDU), and the second data A first process for generating a transmission data unit (eg, MAC PDU) including a unit as a payload, and a second process for generating the transmission data unit including the plurality of first data units as a payload without performing the concatenation process Any one of the above may be determined based on a predetermined condition (e.g., the size of transmittable data). Note that the layer 2 processing unit 103 may be rephrased as a determination unit.

  Further, as described above, the signal transmission unit 101 may perform layer 2 processing. In this case, the signal transmission unit 101 performs the first process or the second process determined by the layer 2 processing unit 103, and transmits the transmission data unit to the base station.

  The layer 2 processing unit 103 determines whether to perform the first process or the second process based on the size of transmittable data determined based on the resource allocation information received from the base station 20 It is good as well. The layer 2 processing unit 103 compares the average value of the size of the transmittable data in a predetermined period with a predetermined threshold, or performs a moving average process using a forgetting factor for the size of the transmittable data. It is good also as determining which of the said 1st process and the said 2nd process is performed by comparing the average value obtained by giving and a predetermined threshold value. The layer 2 processing unit 103 compares the buffer retention amount of data to be transmitted to the base station 20 (data retention amount in the buffer 113) with a predetermined threshold value, or sets a value indicating radio quality and a predetermined threshold value. It is good also as determining which of the said 1st process and the said 2nd process is performed by comparing. The layer 2 processing unit 103 may determine which of the first processing and the second processing is to be performed based on setting information received from the base station 20.

  The upper layer processing unit 104 is configured to perform processing of a layer higher than layer 2. The upper layer processing unit 104 executes, for example, IP packet transmission (generation) / reception processing, RRC processing as C-plane processing (eg, management of setting information received from the base station 20). It is configured.

<Base station 20>
FIG. 12 is a diagram illustrating an example of a functional configuration of the base station 20. As illustrated in FIG. 12, the base station 20 includes a signal transmission unit 201, a signal reception unit 202, a layer 2 processing unit 203, and an upper layer processing unit 204. The layer 2 processing unit 203 includes a buffer 213 that temporarily stores downlink data and the like. The functional configuration shown in FIG. 12 is merely an example. As long as the operation according to the present embodiment can be executed, the function classification and the name of the function unit may be anything. For example, the layer 2 processing unit 203 may be divided into a reception side and a transmission side, the transmission side layer 2 processing unit may be included in the signal transmission unit 201, and the reception side layer 2 processing unit may be included in the signal reception unit 202.

  The signal transmission unit 201 corresponds to a function unit of a physical layer on the transmission side, and is configured to wirelessly transmit a signal passed from the layer 2 processing unit 203. The signal receiving unit 202 corresponds to a functional unit of the physical layer on the receiving side, and is configured to wirelessly receive various signals and pass the received signals to the layer 2 processing unit 203.

  The layer 2 processing unit 203 includes the layer 2 configuration described with reference to FIG. 2 as a basic configuration, and the processing function similar to that of the layer 2 of the user apparatus 10 described in the first embodiment and the second embodiment. It has the same processing function as the layer 2 of the user apparatus 10.

  For example, the layer 2 processing unit 203 generates a second data unit (for example, RLC PDU) by performing a concatenation process for concatenating a plurality of first data units (for example, RLC SDU). A first process for generating a transmission data unit including a payload (eg, MAC PDU) and a second process for generating the transmission data unit including the plurality of first data units as a payload without performing the concatenation process It may be configured to determine which to perform based on a predetermined condition (eg, wireless quality). Note that the layer 2 processing unit 203 may be rephrased as a determination unit.

  Further, as described above, the signal transmission unit 201 may perform layer 2 processing. In that case, the signal transmission unit 201 executes the first process or the second process determined by the layer 2 processing unit 203 and transmits the transmission data unit to the user apparatus 10.

  The upper layer processing unit 204 is configured to perform processing of a layer higher than layer 2. The upper layer processing unit 204 is configured to execute, for example, IP packet transmission (generation) / reception processing and RRC processing as processing in C-plane. The upper layer processing unit 204 is configured to create setting information for the user apparatus 10 and transmit the setting information from the signal transmission unit 201 to the user apparatus 10.

<Hardware configuration>
The block diagrams (FIGS. 11 and 12) used in the description of the above embodiment show functional unit blocks. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one device in which a plurality of elements are physically and / or logically combined, or two or more devices physically and / or logically separated may be directly and directly. It may be realized by a plurality of these devices connected indirectly (for example, wired and / or wirelessly).

  Further, for example, both the user apparatus 10 and the base station 20 in an embodiment of the present invention may function as a computer that performs processing according to the present embodiment. FIG. 13 is a diagram illustrating an example of a hardware configuration of the user apparatus 10 and the base station 20 according to the present embodiment. Each of the above-described user apparatus 10 and base station 20 may be physically configured as a computer apparatus including a processor 1001, a memory 1002, a storage 1003, a communication apparatus 1004, an input apparatus 1005, an output apparatus 1006, a bus 1007, and the like. Good.

  In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configurations of the user apparatus 10 and the base station 20 may be configured to include one or a plurality of apparatuses indicated by 1001 to 1006 shown in the figure, or may be configured not to include some apparatuses. May be.

  Each function in the user apparatus 10 and the base station 20 is obtained by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs an operation and performs communication by the communication apparatus 1004 and memory 1002. This is realized by controlling reading and / or writing of data in the storage 1003.

  For example, the processor 1001 controls the entire computer by operating an operating system. The processor 1001 may be configured by a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.

  In addition, the processor 1001 reads a program (program code), software module, or data from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the signal transmission unit 101, the signal reception unit 102, the layer 2 processing unit 103, and the upper layer processing unit 104 of the user apparatus 10 may be realized by a control program stored in the memory 1002 and operating on the processor 1001. Further, the signal transmission unit 201, the signal reception unit 202, the layer 2 processing unit 203, and the upper layer processing unit 204 of the base station 20 may be realized by a control program stored in the memory 1002 and operating on the processor 1001. Although the above-described various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

  The memory 1002 is a computer-readable recording medium, for example, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), and the like. May be. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to perform the processing according to the embodiment of the present invention.

  The storage 1003 is a computer-readable recording medium such as an optical disc such as a CD-ROM (Compact Disc ROM), a hard disc drive, a flexible disc, a magneto-optical disc (eg, a compact disc, a digital versatile disc, a Blu-ray). (Registered trademark) disk, smart card, flash memory (for example, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. The storage 1003 may be referred to as an auxiliary storage device. The storage medium described above may be, for example, a database, server, or other suitable medium including the memory 1002 and / or the storage 1003.

  The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. For example, the signal transmission unit 101 and the signal reception unit 102 of the user device 10 may be realized by the communication device 1004. Further, the signal transmission unit 201 and the signal reception unit 202 of the base station 20 may be realized by the communication device 1004.

  The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, or the like) that accepts an external input. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

  Each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.

  In addition, the user apparatus 10 and the base station 20 are respectively a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), an FPGA (GRAM), an FPGA (G). It may be configured including hardware, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.

(Summary of embodiment)
As described above, according to the present embodiment, the user apparatus in the wireless communication system including the user apparatus and the base station can perform the connection process by connecting a plurality of first data units. A first process for generating two data units and generating a transmission data unit including the second data unit as a payload; and the transmission data unit including the plurality of first data units as a payload without performing the concatenation process. A determination unit that determines which of the generated second processes is to be performed based on a predetermined condition; and the transmission data unit that executes the first process or the second process determined by the determination unit And a transmission unit that transmits the message to the base station.

  According to said structure, the technique which enables a user apparatus to produce | generate a data unit using the appropriate data unit production | generation method, and to transmit the said data unit is provided.

  The determination unit determines whether to perform the first process or the second process based on the size of transmittable data determined based on the resource allocation information received from the base station. Also good. Since the size of transmittable data can be acquired using an existing mechanism, this configuration can easily implement the implementation.

  The determining unit compares the average value of the size of the transmittable data in a predetermined period with a predetermined threshold, or performs a moving average process using a forgetting factor on the size of the transmittable data. It may be determined which of the first process and the second process is performed by comparing the obtained average value with a predetermined threshold value. With this configuration, since an average value is used, excessively frequent ON / OFF switching can be suppressed.

  The determination unit compares the buffer retention amount of data to be transmitted to the base station with a predetermined threshold value, or compares the value indicating radio quality with a predetermined threshold value, It may be determined which of the second processes is performed. According to this configuration, since the average value or the like is not calculated, the first process / second process determination process can be realized with a low load.

  The determination unit may determine which of the first process and the second process is performed based on setting information received from the base station. According to this configuration, since the average value or the like is not calculated, the first process / second process determination process can be realized with a low load.

  Further, according to the present embodiment, there is provided a data transmission method executed by the user apparatus in a wireless communication system including the user apparatus and a base station, and the second is performed by performing a connection process for connecting a plurality of first data units. A first process for generating a data unit and generating a transmission data unit including the second data unit as a payload, and generating the transmission data unit including the plurality of first data units as a payload without performing the concatenation process A determination step for determining which of the second processing to be performed is performed based on a predetermined condition, the first processing or the second processing determined by the determination step is performed, and the transmission data unit is A data transmission method comprising: a transmission step of transmitting to the base station.

  According to said structure, the technique which enables the user apparatus in a radio | wireless communications system to produce | generate a data unit using the appropriate data unit production | generation method, and to transmit the said data unit is provided.

(Supplement of embodiment)
Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, and the like. I will. Although specific numerical examples have been described in order to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified. The classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, or the items described in one item may be used in different items. It may be applied to the matters described in (if not inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to physical component boundaries. The operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components. About the processing procedure described in the embodiment, the processing order may be changed as long as there is no contradiction. For convenience of processing description, the user apparatus 10 and the base station 20 have been described using functional block diagrams. However, such an apparatus may be realized by hardware, software, or a combination thereof. The software operated by the processor of the user apparatus 10 according to the embodiment of the present invention and the software operated by the processor of the base station 20 according to the embodiment of the present invention are random access memory (RAM), flash memory, and read-only, respectively. The data may be stored in a memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

  The notification of information is not limited to the aspect / embodiment described in the present specification, and may be performed by other methods. For example, notification of information may be physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling). It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. The RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.

  Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Fureure Radio Access), W-CDMA. (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), The present invention may be applied to a Bluetooth (registered trademark), a system using another appropriate system, and / or a next generation system extended based on the system.

  As long as there is no contradiction, the order of the processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be changed. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

  The specific operation assumed to be performed by the base station 20 in this specification may be performed by an upper node in some cases. In a network composed of one or more network nodes having a base station 20, various operations performed for communication with the user equipment 10 may be performed by the base station 20 and / or other than the base station 20. Obviously, it can be done by a network node (for example, but not limited to MME or S-GW). Although the case where there is one network node other than the base station 20 in the above is illustrated, a combination of a plurality of other network nodes (for example, MME and S-GW) may be used.

  Each aspect / embodiment described in this specification may be used independently, may be used in combination, or may be switched according to execution.

  User equipment 10 can be used by those skilled in the art to subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, It may also be referred to as a wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terminology.

  Base station 20 may also be referred to by those skilled in the art as NB (NodeB), eNB (enhanced NodeB), base station (Base Station), or some other suitable terminology.

  As used herein, the terms “determining” and “determining” may encompass a wide variety of actions. “Judgment” and “determination” are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (investigation), investigation (investigation), search (loking up) (for example, table) , Searching in a database or another data structure), considering ascertaining “determining”, “determining”, and the like. Further, “determination” and “determination” are reception (for example, receiving information), transmission (for example, transmitting information), input (input), output (output), and access. (Accessing) (for example, accessing data in a memory) may be considered as “determining” or “determining”. In addition, “determination” and “determination” means that “resolving”, selection (selecting), selection (choosing), establishment (establishing), comparison (comparing), etc. are regarded as “determination” and “determination”. May be included. In other words, “determination” and “determination” may include considering some operation as “determination” and “determination”.

  As used herein, the phrase “based on” does not mean “based only on,” unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

  As long as the terms “including”, “including”, and variations thereof are used herein or in the claims, these terms are similar to the term “comprising”. It is intended to be comprehensive. Furthermore, the term “or” as used herein or in the claims is not intended to be an exclusive OR.

  Throughout this disclosure, if articles are added by translation, for example, a, an, and the in English, these articles are not clearly indicated otherwise from the context, Multiple can be included.

  Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

10 user apparatus 20 base station 101 signal transmission unit 102 signal reception unit 103 layer 2 processing unit 113 buffer 104 upper layer processing unit 201 signal transmission unit 202 signal reception unit 203 layer 2 processing unit 213 buffer 204 upper layer processing unit 1001 processor 1002 memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device

Claims (6)

The user apparatus in a wireless communication system comprising a user apparatus and a base station,
A first process for generating a second data unit by connecting a plurality of first data units to generate a transmission data unit including the second data unit as a payload, and without performing the connection process A determination unit that determines which one of the second processes for generating the transmission data unit including the plurality of first data units as a payload is to be performed based on a predetermined condition;
A user apparatus comprising: a transmission unit that executes the first process or the second process determined by the determination unit and transmits the transmission data unit to the base station. The determination unit determines whether to perform the first process or the second process based on a size of transmittable data determined based on resource allocation information received from the base station. The user device according to claim 1, characterized in that: The determining unit compares the average value of the size of the transmittable data in a predetermined period with a predetermined threshold, or performs a moving average process using a forgetting factor on the size of the transmittable data. The user apparatus according to claim 2, wherein it is determined which of the first process and the second process is performed by comparing the obtained average value and a predetermined threshold value. The determination unit compares the buffer retention amount of data to be transmitted to the base station with a predetermined threshold value, or compares the value indicating radio quality with a predetermined threshold value, The user apparatus according to claim 1, wherein which of the second processes is to be performed is determined. The user apparatus according to claim 1, wherein the determination unit determines which of the first process and the second process is performed based on setting information received from the base station. A data transmission method executed by the user apparatus in a wireless communication system including a user apparatus and a base station,
A first process for generating a second data unit by connecting a plurality of first data units to generate a transmission data unit including the second data unit as a payload, and without performing the connection process A determination step of determining which of the second processes for generating the transmission data unit including the plurality of first data units as a payload is performed based on a predetermined condition;
A data transmission method comprising: a transmission step of executing the first process or the second process determined by the determination step and transmitting the transmission data unit to the base station.

Images