JP5039237B2 - Data communication method in wireless communication system - Google Patents

Description

  The present invention relates to a wireless communication system, and more particularly to a data communication method in a wireless communication system.

  In a wireless communication system that uses a multi-carrier scheme such as OFDMA (Orthogonal Frequency Division Multiple Access) or SC-FDMA (Single Carrier-Frequency Multiple Access), the radio resource is er c. And is defined by a time-frequency region in a two-dimensional space. One time-frequency region is divided by a rectangular shape divided by time coordinates and subcarrier coordinates. That is, one time-frequency region can be divided into a rectangular shape partitioned by at least one symbol on the time axis and subcarriers on a number of frequency axes. Such a time-frequency domain can be allocated to the uplink of a specific UE, or can be transmitted to a specific user by a base station in the downlink. In order to define such a time-frequency domain in a two-dimensional space, the number of OFDM symbols in the time domain and the number of consecutive subcarriers starting from a position separated by an offset from the reference point in the frequency domain. Must be given.

  In E-UMTS (Evolved Universal Mobile Communications System) currently being discussed, a radio frame of 10 ms is used, and one radio frame is composed of 10 subframes. One subframe is composed of two consecutive slots. One slot length is 0.5 ms. In addition, one subframe includes a large number of OFDM symbols, and some symbols (for example, the first symbol) among the large number of OFDM symbols can be used to transmit L1 / L2 control information. .

  FIG. 1 is a diagram illustrating an example of a physical channel structure used in an E-UMTS system. One subframe includes an L1 / L2 control information transmission area (hatched part) and a data transmission area (unhatched part). ).

  FIG. 2 is a diagram for explaining a general method of transmitting data in E-UMTS. In E-UMTS, a hybrid automatic repeat request (HARQ) technique, which is one of data retransmission techniques, is used for the purpose of improving throughput and performing smooth communication.

  Referring to FIG. 2, the base station transmits downlink scheduling information (hereinafter referred to as downlink scheduling information) through a DL L1 / L2 control channel, for example, a PDCCH (Physical Downlink Control Channel), in order to transmit data to the terminal using the HARQ method. 'DL scheduling information'). The DL scheduling information includes a terminal identifier or a terminal group identifier (UE Id or Group Id), a position of a radio resource allocated for transmission of downlink data (Resource assignment), a section (Duration of assignment) information, and modulation. System, payload size, transmission parameters such as MIMO related information (transmission parameters), HARQ process information, redundancy version (Redundancy Version), and identification information (New Data Indicator) indicating whether the data is new Can be included.

  In the above process, a terminal identifier (or group identifier), for example, RNTI (Radio Network Temporary Identifier), is transmitted in order to notify which terminal the DL scheduling information transmitted through the PDCCH is for. The RNTI is classified into a dedicated RNTI and a common RNTI. The dedicated RNTI is used for data transmission / reception to / from a terminal whose information is registered in the base station. The shared RNTI is used for communication with a terminal for which no information is registered in the base station and no dedicated RNTI is assigned, or for transmission / reception of information commonly used by a plurality of terminals such as system information. Is called. For example, RA-RNTI or TC-RNTI used in a random access process through RACH (Random Access Channel) is included in the shared RNTI. This terminal identifier or group identifier can be transmitted in a form of CRC (Cyclic Redundancy Check) masking on DL scheduling information transmitted through PDCCH.

  A terminal located in a specific cell monitors the PDCCH through the L1 / L2 control channel using its own RNTI information, and when it succeeds in CRC decoding with its own RNTI, DL scheduling information is transmitted through the corresponding PDCCH. Receive. This terminal receives downlink data transmitted to itself through PDSCH (Physical Downlink Shared Channel) indicated by the received DL scheduling information.

  Scheduling schemes can be distinguished between dynamic scheduling schemes and persistent or semi-persistent scheduling schemes. The dynamic scheduling scheme is a scheme in which scheduling information is transmitted to a terminal through the DPCCH whenever it is necessary to allocate uplink or downlink resources for a specific terminal. The persistent scheduling method is a method in which a base station statically allocates downlink or uplink scheduling information to a terminal at the initial stage of call setup, for example, when a radio bearer is set up. Say. In this document, “persistent scheduling” has the same meaning as “semi-persistent scheduling”.

  In the case of the persistent scheduling method, each time data is transmitted or received, the terminal does not receive DL scheduling information or UL scheduling information from the base station, but uses scheduling information assigned in advance to the base station. For example, the base station has set in advance a specific terminal to receive downlink data with a cycle of “C” in a transmission format of “B” through a radio resource of “A” via an RRC signal in a radio bearer setting process Then, this terminal can receive downlink data transmitted from the base station using the “A”, “B”, and “C” information. Similarly, when the terminal transmits data to the base station, uplink data can be transmitted using a predetermined radio resource according to uplink scheduling information assigned in advance. This persistent scheduling method is a scheduling method that can be often applied to a service having regular traffic characteristics such as a voice call.

  The AMR codec used in the voice call, that is, the voice data generated through the voice codec has special characteristics. That is, the audio data is classified into two sections, a voice section (talk spurt) and a silent period (silent period). The voice section means a voice data section generated while a person is actually speaking, and the silent section is a voice data section generated while a person is not speaking. For example, a voice packet including voice data in a voice section is generated every 20 ms, and a silence packet (SID) including voice data in a silent section is generated every 160 ms.

  When the persistent scheduling method is used for a voice call, the base station can set radio resources in accordance with the voice interval. That is, the base station pays attention to the characteristic that a voice packet is generated every 20 ms, and pre-sets radio resources for transmitting / receiving uplink or downlink data to the terminal at 20 ms intervals at the call setting stage. The terminal receives downlink data or transmits uplink data using radio resources set in advance at intervals of 20 ms.

  As described above, when scheduling uplink or downlink resources for a voice call using the persistent scheduling method, when the base station switches from the silent period to the voice period or vice versa, There is a demand for a method of quickly changing the assigned radio resource assignment information and reassigning the radio resources suitable for the switched section characteristics. In addition to mutual switching between silent and voice sections, switching between AMR codec modes during voice calls, switching between full header packet generation section and compressed header packet generation section in PDCP entity When an event such as the above occurs, radio resources allocated in advance by the persistent scheduling method cannot efficiently transmit or receive data generated after the event occurs.

  In a wireless communication system, communication can be performed by simultaneously applying a dynamic scheduling method and a persistent scheduling method to one terminal. For example, when a voice call based on the VoIP service is performed by the HARQ method, the persistent scheduling method is applied to the initial transmission packet, and the dynamic scheduling method is applied to the retransmission packet. When the terminal uses two or more services at the same time, the persistent scheduling method can be applied to one service, and the dynamic scheduling method can be applied to other services. In these cases, for the terminal, the scheduling information transmitted to itself is based on what scheduling method, whether it is for the initial transmission packet or the retransmission packet, or what service It is necessary to have a system that can clearly distinguish whether it is for the purpose. In addition, in the case of persistent scheduling, is it setting information for persistent scheduling that is continuously used for the initial transmission packet, or is scheduling information that is temporarily used for the retransmission packet? A clear distinction about is required.

  The present invention has been devised to solve the above-described problems in the prior art, and an object thereof is to provide a data communication method in a wireless communication system that can efficiently use wireless resources in the wireless communication system. It is in.

  Another object of the present invention is to provide a data communication method in a wireless communication system in which a terminal can clearly distinguish scheduling information for persistent scheduling and scheduling information for transmission / reception of retransmission data packets. .

  Still another object of the present invention is to provide a wireless communication system in which a terminal can distinguish a HARQ process identifier of an initial transmission data packet in a downlink data transmission process in which HARQ transmission is performed in an asynchronous manner when a persistent scheduling method is applied. A data communication method is provided.

  The technical problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned can be derived from the following detailed description of the invention from the technical field to which the present invention belongs. It is clearly understood by those who have ordinary knowledge in.

  According to another aspect of the present invention, there is provided a data communication method according to an aspect of the present invention, comprising: receiving from a network first scheduling information including a first terminal identifier and having a specific field set to a specific value in a data communication method at a terminal in a wireless communication system; And receiving a first data packet transmitted from the network according to a persistent scheduling scheme using the first scheduling information. When receiving from the network second scheduling information including the first terminal identifier and having the specific field set to a value other than the specific value, the terminal uses the second scheduling information from the network. The transmitted second data packet is received. The second scheduling information is used only in the corresponding transmission time interval.

  According to another aspect of the present invention, there is provided a data communication method according to another aspect of the present invention, comprising: receiving from a network first scheduling information including a first terminal identifier and having a specific field set to a specific value. And transmitting a first data packet to the network using a persistent scheduling scheme using the first scheduling information. When receiving from the network second scheduling information including the first terminal identifier and having the specific field set to a value other than the specific value, the terminal uses the second scheduling information to transmit the second scheduling information to the network. A second data packet is transmitted. The second scheduling information is used only in the corresponding transmission time interval.

  According to still another aspect of the present invention, there is provided a data communication method in a data communication method at a terminal in a wireless communication system, receiving scheduling information including downlink channel resource allocation information and a specific indicator from a network, and the scheduling information. Receiving a downlink data packet transmitted from the network using the scheduling information as setting information of a persistent scheduling method when the first indicator includes a first terminal identifier and the specific indicator has a first value; Receiving a retransmission data packet transmitted from the network using the scheduling information when the scheduling information includes a first terminal identifier and the specific indicator has a second value. Composed.

  According to another aspect of the present invention, there is provided a data communication method comprising: receiving scheduling information including uplink channel resource allocation information and a specific indicator from a network in a data communication method at a terminal in a wireless communication system; Transmitting the uplink data to the network using the scheduling information as setting information of a persistent scheduling method when the first indicator includes a first terminal identifier and the specific indicator has a first value; and the scheduling information Includes a first terminal identifier, and when the specific indicator has a second value, transmitting retransmission data from the network using the scheduling information.

  A data communication method according to still another aspect of the present invention is a data communication method at a terminal in a wireless communication system, the step of receiving downlink channel resource setting information for persistent scheduling from a network; Receiving at least two downlink data packets using link channel resource configuration information, wherein a HARQ process identifier of each received downlink data packet is assigned to at least two HARQ pre-assigned from the network. It is characterized by sequentially setting each HARQ process identifier among the process identifiers (HARQ Process IDs).

  According to still another aspect of the present invention, there is provided a data communication method in a network in a wireless communication system, wherein at least two HARQ process identifiers for downlink data reception by a persistent scheduling method are allocated to a terminal, Transmitting scheduling information for setting persistent scheduling to the terminal, and transmitting at least two downlink data packets according to the scheduling information to the terminal. The HARQ process identifier of the link data packet is sequentially set to each HARQ process identifier among at least two HARQ process identifiers allocated in advance from the network. To.

  In this document, “scheduling information” means information transmitted from a network to a terminal in order to allocate downlink and / or uplink channel resources to the terminal. This scheduling information is transmitted to the terminal through the control channel, and may include downlink and / or uplink channel resource allocation information and HARQ related information. The term “scheduling information” may be replaced with a term normally used in the technical field to which the present invention belongs, such as “resource allocation information” and “uplink / downlink allocation information”.

  According to the present invention, the following effects can be obtained.

  First, radio resources can be efficiently used in a radio communication system.

  Second, when communication is performed between the network and the terminal in the wireless communication system, the scheduling information received by the terminal from the network is the setting information for persistent scheduling, or the retransmission data packet It can be clearly distinguished whether it is scheduling information for transmission and reception.

  Third, when a persistent scheduling communication is performed between a network and a terminal in a wireless communication system, the terminal clearly identifies the HARQ process identifier of the initial data packet in the downlink data transmission process in which HARQ transmission is performed in an asynchronous manner. Can be distinguished.

The effects of the present invention are not limited to the above effects, and other effects not mentioned will be apparent to those having ordinary knowledge in the technical field to which the present invention belongs from the following detailed description of the invention.
For example, the present invention provides the following items.
(Item 1)
A data communication method at a terminal in a wireless communication system,
Receiving scheduling information including downlink channel resource allocation information and a specific indicator from the network;
When the scheduling information includes a first terminal identifier and the specific indicator has a first value, a downlink data packet transmitted from the network is received using the scheduling information as persistent scheduling configuration information. And the stage of
Receiving the retransmission data packet transmitted from the network using the scheduling information when the scheduling information includes a first terminal identifier and the specific indicator has a second value;
Including a data communication method.
(Item 2)
Item 2. The data communication method according to Item 1, wherein when the scheduling information includes a second terminal identifier, the scheduling information is used as channel resource allocation information by a dynamic scheduling method.
(Item 3)
The data communication according to item 1, wherein when the scheduling information includes a first terminal identifier and the specific indicator has a first value, the scheduling information is used in at least two transmission time intervals. Method.
(Item 4)
If the scheduling information includes a first terminal identifier and the specific indicator has a second value or the scheduling information includes a second terminal identifier, the scheduling information is used in one transmission time interval. Item 3. The data communication method according to Item 2.
(Item 5)
Item 2. The data communication method according to Item 1, wherein the first terminal identifier is SPS (Semi-Persistent Scheduling) -C-RNTI.
(Item 6)
Item 2. The data communication method according to Item 1, wherein the specific indicator is NDI (New Data Indicator).
(Item 7)
Item 3. The data communication method according to Item 2, wherein the second terminal identifier is C-RNTI or temporary C-RNTI.
(Item 8)
The data communication method according to item 1, wherein the scheduling information is received through a PDCCH (Physical Downlink Control Channel).
(Item 9)
The data communication method according to item 1, wherein the downlink data packet is an initial transmission data packet.
(Item 10)
10. The data communication method according to item 9, wherein the retransmission data packet is a retransmission packet for an initial transmission data packet according to a persistent scheduling scheme.
(Item 11)
A data communication method at a terminal in a wireless communication system,
Receiving scheduling information including uplink channel resource allocation information and a specific indicator from the network;
When the scheduling information includes a first terminal identifier and the specific indicator has a first value, transmitting the uplink data to the network using the scheduling information as setting information for a persistent scheduling scheme;
Transmitting the retransmission data to the network using the scheduling information when the scheduling information includes a first terminal identifier and the specific indicator has a second value;
Including a data communication method.
(Item 12)
Item 12. The data communication method according to Item 11, wherein when the first scheduling information includes a second terminal identifier, the scheduling information is used as channel resource allocation information by a dynamic scheduling method.
(Item 13)
Item 12. The data communication according to Item 11, wherein when the scheduling information includes a first terminal identifier and the specific indicator has a first value, the scheduling information is used in at least two transmission time intervals. Method.
(Item 14)
If the scheduling information includes a first terminal identifier and the specific indicator has a second value or the scheduling information includes a second terminal identifier, the scheduling information is used in one transmission time interval. Item 12. The data communication method according to Item 11, wherein
(Item 15)
Item 12. The data communication method according to Item 11, wherein the first terminal identifier is SPS-C-RNTI.
(Item 16)
Item 12. The data communication method according to Item 11, wherein the specific indicator is NDI (New Data Indicator).
(Item 17)
Item 13. The data communication method according to Item 12, wherein the second terminal identifier is C-RNTI or temporary C-RNTI.
(Item 18)
12. The data communication method according to item 11, wherein the scheduling information is received through a PDCCH.
(Item 19)
Item 12. The data communication method according to Item 11, wherein the uplink data packet is an initial transmission data packet.
(Item 20)
Item 20. The data communication method according to Item 19, wherein the retransmission data packet is a retransmission packet for an initial transmission data packet by a persistent scheduling method.
(Item 21)
A data communication method at a terminal in a wireless communication system,
Receiving scheduling information for setting up persistent scheduling from the network;
Receiving at least two downlink data packets from the network using the scheduling information;
Including
The HARQ process identifier of each received downlink data packet is sequentially set to each HARQ process identifier of at least two HARQ process identifiers (HARQ Process IDs) allocated in advance from the network. , Data communication method.
(Item 22)
Item 22. The data communication method according to Item 21, wherein the received at least two downlink data packets are initial transmission data packets.
(Item 23)
Item 22. The data communication method according to Item 21, wherein the scheduling information includes SPS-C-RNTI for identifying the terminal and NDI set to a specific value.
(Item 24)
Item 22. The data communication method according to Item 21, wherein the scheduling information includes downlink channel resource allocation information and HARQ related information.
(Item 25)
A data communication method in a network in a wireless communication system,
Assigning the terminal with at least two HARQ process identifiers for downlink data reception according to a persistent scheduling scheme;
Transmitting scheduling information for setting of persistent scheduling to the terminal;
Transmitting at least two downlink data packets to the terminal according to the scheduling information;
Including
The HARQ process identifier of each downlink data packet received by the terminal is sequentially set to each HARQ process identifier among at least two HARQ process identifiers allocated in advance from the network. Communication method.
(Item 26)
26. The data communication method according to item 25, wherein the at least two downlink data packets are initial transmission data packets.
(Item 27)
26. The data communication method according to item 25, wherein the scheduling information includes SPS-C-RNTI for identifying the terminal and NDI set to a specific value.
(Item 28)
26. The data communication method according to item 25, wherein the scheduling information includes downlink channel resource allocation information and HARQ related information.

It is a figure which shows an example of the physical channel structure used with an E-UMTS system. It is a figure for demonstrating the general method which transmits data by E-UMTS. It is a figure which shows the network structure of E-UMTS. It is a schematic block diagram of E-UTRAN (Evolved Universal Terrestrial Radio Access Network). FIG. 5A is a control plane protocol configuration diagram, and FIG. 5B is a user plane protocol configuration diagram, illustrating a structure of a radio interface protocol between a terminal (UE) and an E-UTRAN. FIG. 5A is a control plane protocol configuration diagram, and FIG. 5B is a user plane protocol configuration diagram, illustrating a structure of a radio interface protocol between a terminal (UE) and an E-UTRAN. 3 is a flowchart illustrating a procedure of a data transmission method according to an embodiment of the present invention. 6 is a flowchart illustrating a procedure of a data transmission method according to another embodiment of the present invention. 6 is a flowchart illustrating a procedure of a data transmission method according to another embodiment of the present invention. 6 is a flowchart illustrating a procedure of a data transmission method according to another embodiment of the present invention. 6 is a flowchart illustrating a procedure of a data transmission method according to another embodiment of the present invention.

  Hereinafter, the configuration, operation, and other features of the present invention will be easily understood by the embodiments of the present invention described with reference to the accompanying drawings. The embodiment described below is an example in which the technical features of the present invention are applied to E-UMTS (Evolved Universal Mobile Telecommunications System).

  FIG. 3 is a diagram illustrating a network structure of E-UMTS. The E-UMTS system is an evolved system from the existing WCDMA UMTS system, and basic standardization work is currently underway in 3GPP (3rd Generation Partnership Project). E-UMTS can also be referred to as a LTE (Long Term Evolution) system.

Referring to FIG. 3, E-UTRAN is configured with base stations (hereinafter abbreviated as “eNode B” or “eNB”), and the eNBs are connected to each other through an X2 interface. The eNB is connected to a terminal (User Equipment; hereinafter, abbreviated as “UE”) through a wireless interface, and EPC (Evolved
(Packet Core). EPC is MME (Mobility Management Entity) / SAE (System Architecture).
Evolution) gateway.

The radio interface protocol layer between the terminal and the network is based on L1 (first) based on the lower three layers of the Open System Interconnection (OSI) standard model widely known in communication systems. Layer), L2 (second layer), and L3 (third layer). Among these, the physical layer belonging to the first layer is an information transfer service (Information Transfer) using a physical channel.
The radio resource control (Radio Resource Control; hereinafter, abbreviated as 'RRC') layer provided in the third layer plays a role of controlling radio resources between the terminal and the network. For this, the RRC layer exchanges RRC messages between the terminal and the network. The RRC layer can be distributed among network nodes such as Node B and AG, or can be independently positioned at Node B or AG.

  FIG. 4 is a schematic configuration diagram of E-UTRAN (Evolved Universal Terrestrial Radio Access Network). In FIG. 4, a hatched portion indicates a functional entity of a user plane, and a non-hatched portion indicates a functional entity of a control plane.

5A and 5B are diagrams illustrating a structure of a radio interface protocol between the terminal (UE) and the E-UTRAN, FIG. 5A is a control plane protocol configuration diagram, and FIG. 5B is a user plane protocol configuration diagram. FIG. 5A and 5B includes a physical layer (Physical Layer), a data link layer (Data Link Layer), and a network layer (Network Layer), and vertically for data information transmission. A user plane and a control plane for transmitting a control signal (Signaling) are distinguished. The protocol layer of FIGS. 5A and 5B is an open system interconnection (Open) widely known in communication systems.
Based on the lower three layers of the System Interconnection (OSI) reference model, L1 (first layer), L2 (second layer), and L3 (third layer) can be distinguished.

  The physical layer, which is the first layer, provides an information transfer service (Information Transfer Service) to an upper layer using a physical channel. The physical layer is connected to an upper medium access control layer through a transmission channel, and data between the medium connection control layer and the physical layer moves through the transmission channel. Data moves between different physical layers, that is, between the physical layer on the transmission side and the physical layer on the reception side through the physical channel. In E-UMTS, a physical channel is modulated by an OFDM (Orthogonal Frequency Division Multiplexing) scheme, thereby using time and frequency as radio resources.

  The second layer medium connection control (Medium Access Control; hereinafter abbreviated as 'MAC') layer is a radio link control (Radio Link Control; hereinafter abbreviated as 'RLC') which is a higher layer through a logical channel (Logical Channel). Serving the tier. The second RLC layer supports reliable data transmission. The PDCP layer of the second layer uses header compression (Header Compression) to reduce unnecessary control information in order to efficiently transmit data in a wireless section with a relatively small bandwidth using IP packets such as IPv4 and IPv6. ) Fulfill the function.

  The radio resource control (Radio Resource Control; hereinafter abbreviated as 'RRC') layer located at the bottom of the third layer is defined only in the control plane, and is defined as a radio bearer (hereinafter referred to as 'RB'). It is responsible for control of logical channels, transmission channels, and physical channels for setting (Configuration), resetting (Re-configuration), and releasing (Release). Here, RB means a service provided by the second layer for data transmission between the terminal and the UTRAN.

In a downlink transmission channel for transmitting data to a terminal in a network, BCH (Broadcast Channel) for transmitting system information, PCH (Paging Channel) for transmitting a paging message, other downlink SCH (Shared Channel) for transmitting user traffic and control messages ) The downlink multicast or broadcast service traffic or the control message may be transmitted through the downlink SCH, or may be transmitted through another downlink MCH (Multicast Channel). On the other hand, an uplink transmission channel for transmitting data from the terminal to the network includes a RACH (Random Access) for transmitting an initial control message.
There is an uplink SCH (Shared Channel) that transmits user traffic and control messages.

  The logical channel (Logical Channel) provided above the transmission channel and mapped to the transmission channel includes BCCH (Broadcast Channel), PCCH (Paging Control Channel), CCCH (Common Control Channel), MCCH (Multicast Control). MTCH (Multicast Traffic Channel) is available.

The E-UMTS system uses the OFDM scheme in the downlink, and the uplink uses SC-FDMA (Single Carrier-Frequency Division).
(Multiple Access) method is used. An OFDM system that is a multi-carrier scheme is a system that allocates resources in units of a large number of subcarriers in which a part of carrier waves is grouped, and uses OFDMA (Orthogonal Frequency Division Multiple Access) as a connection scheme.

  FIG. 6 is a flowchart illustrating a procedure of a data transmission method according to an embodiment of the present invention. The embodiment of FIG. 6 relates to an example in which a terminal (UE) receives an SRB packet by a dynamic scheduling method while receiving voice data (VoIP packet) by a persistent scheduling method. Hereinafter, description will be made only within the limits necessary for understanding the embodiment of the present invention, and description of other general procedures necessary for communication between the network and the terminal will be omitted.

  Referring to FIG. 6, the base station (eNB) allocates two terminal identifiers to the terminal [S61]. Examples of these two terminal identifiers include, but are not limited to, C-RNTI and SPS-C-RNTI (Semi-Persistent Scheduling), and other terminal identifiers such as temporary C-RNTI or RA-RNTI. Etc. are also possible. These two terminal identifiers can be assigned to the terminal by a network in a random access process, a call setup process, or a radio bearer (RB) setup process. Moreover, these two terminal identifiers may be assigned simultaneously or individually.

  The base station transmits the initial transmission VoIP packet (V1) to the terminal through the PDSCH [S62]. The initial transmission VoIP packet (V1) means a voice packet that is not a retransmission packet when the HARQ scheme is applied. If the terminal cannot successfully receive the initial transmission VoIP packet (V1), that is, if the terminal fails to decode the initial transmission VoIP packet, the terminal sends a negative acknowledgment signal (NACK) to the PUCCH (Physical Uplink Control Channel). The data is transmitted to the base station through [S63]. A persistent scheduling method is applied to the transmission and reception of the initial transmission VoIP packet (V1) and NACK. That is, each time the terminal receives the initial transmission VoIP packet (V1) or transmits NACK (or ACK), the terminal does not receive DL scheduling information or UL scheduling information from the base station, and is assigned to the base station in advance. Use scheduling information. Therefore, the terminal does not need to receive scheduling information in steps S62 and S63.

  As described above, when the terminal receives the initial transmission VoIP packet (V1) or transmits the NACK (or ACK), the persistent scheduling method is applied, but the base station dynamically transmits the retransmission VoIP packet. A scheduling scheme is applied. Therefore, after the terminal transmits a NACK to the base station, scheduling information must first be received in order to receive a retransmission packet, and for this purpose, the terminal monitors the PDCCH of the L1 / L2 control channel.

  In FIG. 6, the base station transmits the first scheduling information to the terminal through the PDCCH [S64]. The first scheduling information is information for allocating uplink and downlink channel resources to a terminal by a dynamic scheduling scheme, and can include DL scheduling information and UL scheduling information. The first scheduling information is assumed to be scheduling information for the base station to transmit the SRB packet to the terminal.

  Since the terminal is in a state of transmitting a NACK to the initial transmission VoIP packet transmitted from the base station in step S63, the terminal monitors the PDCCH to receive the retransmission VoIP packet for the initial transmission VoIP packet (V1). To do. However, when the scheduling information for receiving the retransmission VoIP packet is not transmitted through the PDCCH and the first scheduling information for transmitting the SRB packet is transmitted as in step S64, according to the prior art, The terminal may misunderstand this first scheduling information as scheduling information for receiving a retransmission VoIP packet. In this case, the terminal determines that the initial transmission SRB packet received using the first scheduling information is a retransmitted VoIP packet, combines the initial transmission VoIP packet with the HARQ scheme, and tries to restore the packet. As an error.

  In order to prevent such an error, in the embodiment of FIG. 6, the scheduling information transmitted through the PDCCH is transmitted by including instruction information for instructing that the corresponding scheduling information is transmitted by a specific scheduling method. To do. In the embodiment of FIG. 6, two terminal identifiers assigned in step S61 are used as the instruction information. That is, the C-RNTI is used as information indicating that scheduling information is transmitted by the dynamic scheduling method, and the SPS-C-RNTI is a retransmission packet for the initial transmission packet transmitted by the persistent scheduling method. It can be used as information for instructing that scheduling information for transmission is transmitted. That is, in FIG. 6, the SPS-C-RNTI indicates that the corresponding scheduling information is scheduling information for transmission of the retransmitted VoIP packet with respect to the initial transmission VoIP packet transmitted by the persistent scheduling method. used. The C-RNTI or SPS-C-RNTI can be included in the corresponding scheduling information and transmitted, or can be transmitted in the form of CRC masking in the scheduling information.

  In FIG. 6, when the C-RNTI is included in the scheduling information received in step S64, the terminal recognizes that the scheduling information is scheduling information based on a dynamic scheduling method, and uses the scheduling information. The initial transmission SRB packet (S1) transmitted from the base station is received [S65].

  The base station transmits the second scheduling information including the SPS-C-RNTI to the terminal through the PDCCH to transmit the retransmission packet (V2) for the initial transmission VoIP packet (V1) [S66]. When receiving the second scheduling information including the SPS-C-RNTI, the terminal receives the retransmitted VoIP packet (V2) transmitted from the base station using the second scheduling information [S67]. The terminal combines the received retransmission VoIP packet (V2) and the initial transmission VoIP packet (V1) by the HARQ method to restore the VoIP packet [S68]. If the restoration of the VoIP packet is successful, the terminal transmits a reception acknowledgment signal (ACK) to the base station [S69]. The VoIP packet means a data packet to be transmitted from the base station to the terminal, and is divided into an initial transmission VoIP packet (V1) and a re-transmission VoIP packet (V2) for transmission by the HARQ method. Is transmitted.

  In the embodiment of FIG. 6, the first and second scheduling information can identify whether the data packet transmitted from the base station to the terminal is an initial transmission packet or a retransmission packet according to the first and second scheduling information. Identification information can be further included. This identification information can be included in the first and second scheduling information by setting the specific fields of the first scheduling information and the second scheduling information to values that have already been set. For example, by setting specific values such as 1, 2, 3, etc. in the redundancy version (RV) field included in the first and second scheduling information, the first retransmission packet, the second retransmission packet, It can be displayed that it is a transmission packet and a third retransmission packet. In addition to the RV field, other fields included in the first and second scheduling information, for example, the HARQ process ID field, the format field, the MCS field, the NDI (New data indicator) field, the TPC field, “Cyclic” It can be used as identification information by setting at least one field such as a “shift for DMRS” field, a “TX antenna” field, and a CQI request field to a specific value.

  In the embodiment of FIG. 6, when a specific field included in the scheduling information, for example, the HARQ process ID field, is set to a specific value promised in advance, the terminal that has received the scheduling information It is regarded as setting information for the stent scheduling method. Therefore, a terminal that has received scheduling information including the HARQ process ID field set to this specific value until the radio bearer (RB) or call setup is canceled or updated to another scheduling information. Data is transmitted or received by the persistent scheduling method using this scheduling information.

  In this case, a terminal that has received scheduling information including a HARQ process ID field set to a value other than a specific value may use this scheduling information only in a corresponding transmission time interval (TTI), Only used until the maximum number of transmissions is reached in the HARQ processor associated with this scheduling information.

  FIG. 7 is a flowchart illustrating a procedure of a data transmission method according to another embodiment of the present invention. The embodiment of FIG. 7 relates to an example in which the terminal (UE) receives the SRB packet by the dynamic scheduling method while the terminal (UE) receives the voice data (VoIP packet) by the persistent scheduling method, similarly to the embodiment of FIG. In this embodiment, the HARQ method based on the dynamic scheduling method and the HARQ method based on the persistent scheduling method are distinguished. In the following, description will be made only to the extent necessary for understanding the embodiment of the present invention, and description of other general procedures necessary for communication between the network and the terminal will be omitted.

  As described above, when the terminal receives the initial transmission VoIP packet or transmits a NACK (or ACK) for the initial transmission VoIP packet, the persistent scheduling method is applied, but the base station transmits the retransmission VoIP packet. A dynamic scheduling scheme is applied. Therefore, in order to receive a retransmission VoIP packet from the base station after the terminal transmits a NACK for the initial transmission VoIP packet to the base station, scheduling information must first be received through the PDCCH.

  When a terminal receives a packet based on a dynamic scheduling method, for example, an SRB packet, during a voice call, scheduling information transmitted for transmission / reception of a retransmission VoIP packet and scheduling information transmitted for reception of an SRB packet It is necessary to distinguish and receive. For this purpose, in the embodiment of FIG. 7, the HARQ process ID field included in the scheduling information transmitted for transmission / reception of the retransmitted VoIP packet is set to at least one specific value. In the embodiment of FIG. 7, when the HARQ process ID field is set to '101', '110', or '111', the corresponding scheduling information is scheduling information transmitted for transmission / reception of a retransmitted VoIP packet. It is an example representing the effect. The base station and the terminal set the HARQ process ID field to indicate the scheduling information transmitted for transmission / reception of the retransmitted VoIP packet in the initial connection process, the call setting process, or the RB setting process. Can be promised to set in advance.

  Referring to FIG. 7, the base station (eNB) transmits an initial transmission VoIP packet (V1) to the terminal (UE) [S71]. This initial transmission VoIP packet means a voice data packet that is not a retransmission packet. If the terminal cannot successfully receive the initial transmission VoIP packet, the terminal transmits a negative acknowledgment signal (NACK) to the base station [S72].

  In order to transmit the initial transmission SRB packet (S1), the base station transmits the first scheduling information to the terminal through the PDCCH [S73]. When the setting value of the HARQ process ID field included in the received first scheduling information is not a specific value promised in advance, the terminal determines that the first scheduling information is the retransmission packet for the initial transmission VoIP packet (V1). Recognize that it is not for. Since the HARQ process ID field of the first scheduling information is set to '000' instead of a value promised in advance, the terminal transmits an initial transmission SRB packet (S1) transmitted from the base station using the first scheduling information. ) Is received [S74]. If the initial transmission SRB packet (S1) cannot be successfully decoded, the terminal transmits a NACK to the base station [S75].

  In order to transmit the first retransmission VoIP packet (V2) corresponding to the initial transmission VoIP packet (V1) to the terminal, the base station sets the HARQ process ID field to '101' which is one of the specific values promised in advance. The second scheduling information is transmitted to the terminal through the PDCCH [S76]. The terminal confirms that the HARQ process ID field of the received second scheduling information is set to a specific value promised in advance, and then the second scheduling information indicates the retransmission packet for the initial transmission VoIP packet (V1). It is possible to grasp that the scheduling information is for this purpose.

  The base station transmits the first retransmission VoIP packet (V2) to the terminal using the second scheduling information, and the terminal receives the first retransmission VoIP packet (V2) using the second scheduling information [S77]. The terminal combines and decodes the first retransmission VoIP packet (V2) and the initial transmission VoIP packet (V1) according to the HARQ scheme [S78]. If the terminal cannot successfully restore the VoIP packet, the terminal transmits a NACK to the base station [S79].

  In order to transmit a retransmission packet for the initial transmission SRB packet (S1), the base station transmits the third scheduling information in which the HARQ process ID is set to '000' to the terminal through the PDCCH [S80]. The base station transmits the retransmission SRB packet (S2) to the terminal using the third scheduling information, and the terminal receives the retransmission SRB packet (S2) using the third scheduling information [S81]. The terminal combines and decodes the received retransmission SRB packet (S2) and the initial transmission SRB packet (S1) [S82], and when the decoding is successful, transmits an ACK to the base station [S83].

  In order to transmit a retransmission packet for the first retransmission VoIP packet (V2), the base station transmits fourth scheduling information in which the HARQ process ID field is set to '110' to the terminal through the PDCCH [S84]. . After confirming that the HARQ process ID field of the received fourth scheduling information is set to a specific value promised in advance, the terminal retransmits the fourth scheduling information for the first retransmission VoIP packet (V2). It can be understood that this is scheduling information for a packet.

  The base station transmits a second retransmission VoIP packet (V3), which is a retransmission packet for the first retransmission VoIP packet (V2), to the terminal according to the fourth scheduling information, and the terminal uses the fourth scheduling information. The second retransmission VoIP packet (V3) is received [S85]. The terminal combines and decodes the second retransmission VoIP packet (V3), the first retransmission VoIP packet (V2), and the initial transmission VoIP packet (V1) according to the HARQ scheme [S86]. If the VoIP packet is successfully restored, the terminal transmits an ACK to the base station [S87].

  When the HARQ process ID field can be set to a number of specific values to indicate that the scheduling information is transmitted for transmission / reception of a retransmitted VoIP packet as in the embodiment of FIG. Specific values may be sequentially included in the HARQ process ID field, and arbitrarily selected specific values may be included in the HARQ process ID field. In order to indicate that the scheduling information is transmitted for transmission / reception of the retransmitted VoIP packet, it is possible to set another field of the scheduling information to a specific value instead of the HARQ process ID field.

  In the embodiment of FIG. 7, the HARQ process ID field included in the scheduling information is set to a specific value, so that the scheduling information for the retransmission packet for the initial transmission VoIP packet in which the scheduling information is transmitted by the persistent scheduling method. It is an example showing that.

  As another embodiment, when a specific field included in the scheduling information, for example, a HARQ process ID field is set to a specific value promised in advance, a terminal that has received the scheduling information may receive the scheduling information as a persistent scheduling. It is considered as setting information for the method. Therefore, a terminal that has received scheduling information including the HARQ process ID field set to this specific value until the radio bearer (RB) or call setup is canceled or updated to other scheduling information. The data is transmitted or received by the persistent scheduling method using the scheduling information.

  In this case, a terminal that has received scheduling information including a HARQ process ID field set to a value other than the specific value may use the scheduling information only in a corresponding transmission time interval (TTI). The HARQ processor associated with this scheduling information is used only until the maximum number of transmissions is reached.

FIG. 8 is a flowchart showing a procedure of a data communication method according to still another embodiment of the present invention. The embodiment of FIG. 8 relates to an example in which a terminal transmits uplink data, for example, data for a voice call, to a base station by a persistent scheduling method. In the following, description will be made only to the extent necessary for understanding the embodiment of the present invention, and description of other general procedures necessary for communication between the network and the terminal will be omitted.

  As described above, even when the initial transmission data packet is transmitted by the persistent scheduling method, the dynamic scheduling method is used for transmission of the retransmission packet for the initial transmission data packet. Also, the same SPS-C-RNTI is used for the first scheduling information for setting the persistent scheduling and the second scheduling information for transmitting the retransmission packet for the initial transmission data packet by the persistent scheduling method. Therefore, a specific field or indicator included in the scheduling information can be used to distinguish the first scheduling information and the second scheduling information. In the embodiment of FIG. 8, NDI (New Data Indicator) is used. However, this specific field or indicator is not limited to NDI. For example, in order to distinguish scheduling information for setting persistent scheduling, it is possible to set a RV (redundancy version) included in the scheduling information to a value designated in advance.

  In this document, “initial transmission data packet” means a packet that is transmitted for each HARQ process for the first time in HARQ transmission. The “retransmission data packet” means a packet that is retransmitted when a NACK is received from the reception side for the initial transmission data packet or another retransmission data packet.

  Referring to FIG. 8, the base station (eNB) transmits first scheduling information for configuration of persistent scheduling to a terminal (UE) through a PDCCH [S801]. The first scheduling information includes uplink channel resource allocation information and HARQ related information. The first scheduling information is CRC masked using the SPS-C-RNTI assigned to the terminal, and the NDI included in the first scheduling information is set to “0”. From the SPS-C-RNTI, the terminal knows that the first scheduling information is information related to persistent scheduling. From the NDI set to “0”, the first scheduling information is the persistent scheduling setting information. I know that there is. The UE periodically transmits uplink data packets using the uplink channel resource allocation information and HARQ related information included in the first scheduling information. The terminal continues to use the first scheduling information until the radio bearer (RB) is released or replaced with another setting information.

  The terminal that has received the first scheduling information transmits the first initial transmission data packet to the base station using the uplink channel resource allocation information [S802]. If the base station fails to decode the first initial transmission data packet, the base station transmits a NACK to the terminal [S803]. After transmitting the NACK to the terminal, the base station transmits the second scheduling information to the terminal through the PDCCH [S804]. The second scheduling information includes uplink channel resource allocation information and HARQ related information for retransmission packet transmission. The second scheduling information includes SPS-C-RNTI, and NDI is set to “1” to indicate that the second scheduling information is related to transmission of a retransmission packet.

  The terminal transmits the first retransmission data packet as a retransmission packet for the first initial transmission data packet to the base station using the uplink channel resource allocation information included in the second scheduling information [S805]. The base station combines the first retransmission data packet with the first initial transmission data packet and decodes it. If the decoding is successful, the base station transmits ACK to the terminal [S806].

  The terminal transmits the second initial transmission data packet to the base station [S807]. At this time, the terminal transmits the second initial transmission data packet through the uplink channel resource according to the uplink channel resource allocation information included in the first scheduling information. If the base station fails to decode the second initial transmission data packet, the base station transmits a NACK to the terminal [S808]. Thereafter, the base station transmits the third scheduling information to the terminal using the SPS-C-RNTI assigned to the terminal [S809]. The third scheduling information includes the NDI set to “1”, and the terminal can recognize from the NDI that the third scheduling information is information for transmission of the retransmission data packet. The terminal transmits the second retransmission data packet as a retransmission packet for the second initial transmission data packet to the base station using the uplink channel resource allocation information included in the third scheduling information [S810]. The base station decodes the second retransmission data packet combined with the second initial transmission data packet, and transmits the ACK to the terminal when the decoding is successful [S811].

  When the base station needs to change the setting information for persistent scheduling, the base station transmits the fourth scheduling information to the terminal [S812]. The fourth scheduling information includes the SPS-C-RNTI assigned to the terminal, and the NDI included in the fourth scheduling information is set to “0”. The terminal can grasp from the NDI set to “0” that the fourth scheduling information is information for setting persistent scheduling. Thereafter, in order for the terminal to transmit the initial transmission data packet to the base station, the uplink channel resource allocation information and HARQ related information included in the fourth scheduling information are used.

  FIG. 9 is a flowchart illustrating a procedure of a data communication method according to still another embodiment of the present invention. The embodiment of FIG. 9 relates to an example in which a terminal receives downlink data, for example, data for a voice call, from a base station according to a persistent scheduling scheme. In the following, description will be made only to the extent necessary for understanding the embodiment of the present invention, and description of other general procedures necessary for communication between the network and the terminal will be omitted.

  The basic structure of the embodiment of FIG. 9 is the same as the embodiment of FIG. 9 except that the embodiment of FIG. 8 is related to the transmission of uplink data and the embodiment of FIG. This is substantially the same as that of the embodiment of FIG. However, in the embodiment of FIG. 9, at least one of a large number of HARQ process IDs is pre-assigned to the terminal as for persistent scheduling.

  Referring to FIG. 9, the base station (eNB), for example, sets “0” and “1” among 8 HARQ process IDs from “0” to “7” to the HARQ process ID for persistent scheduling. To the terminal (UE) [S901]. These HARQ process IDs can be assigned from a base station to a terminal through an RRC message in a call setup or radio bearer setup process. The terminal sequentially sets the HARQ process ID of the initial transmission data packet to each HARQ process ID among the HARQ process IDs assigned in advance from the base station. In the embodiment of FIG. 9, two HARQ process IDs are assigned for persistent scheduling, but in some cases, one HARQ process ID or three or more HARQ process IDs are pre-assigned for persistent scheduling. Is also possible.

  The base station transmits first scheduling information for persistent scheduling configuration to the terminal (UE) through the PDCCH [S902]. The first scheduling information includes downlink channel resource allocation information and HARQ related information. The first scheduling information is CRC masked using the SPS-C-RNTI assigned to the terminal, and the NDI included in the first scheduling information is set to “0”. The terminal knows from SPS-C-RNTI that this first scheduling information is information related to persistent scheduling, and from NDI set to “0”, the first scheduling information is persistent scheduling setting information. It can be seen that it is. The terminal receives a downlink data packet from the base station using the downlink channel resource allocated by the downlink channel resource allocation information included in the first scheduling information. The terminal uses the first scheduling information continuously until the radio bearer (RB) is released or replaced with another setting information.

  The terminal that has received the first scheduling information receives the first initial transmission data packet from the base station using the downlink channel resource allocation information [S903]. The terminal assumes that the HARQ process ID for the first initial transmission data packet is the first ID of the HARQ process IDs assigned in advance in step S901, that is, “0”, and the first initial transmission data. Decrypt the packet.

  If the terminal fails to decode the first initial transmission data packet, the terminal transmits a NACK to the base station [S904]. The base station transmits the second scheduling information to the terminal through the DPCCH [S905]. The second scheduling information includes downlink channel resource allocation information and HARQ related information for receiving retransmission packets. The HARQ process ID included in the HARQ related information is set to “0”. From the HARQ process ID set to “0”, the terminal can recognize that the data packet received using the second scheduling information is a retransmission packet for the first initial transmission data packet. The second scheduling information includes SPS-C-RNTI, and NDI is set to “1” to indicate that the second scheduling information is related to reception of a retransmission packet.

  The terminal receives the first retransmission data packet as a retransmission packet for the first initial transmission data packet from the base station using the downlink channel resource allocation information and the HARQ related information included in the second scheduling information [S906. ]. The terminal combines the first retransmission data packet with the first initial transmission data packet and decodes it. If the decoding fails, the terminal transmits NACK to the base station [S907].

  The terminal receives the second initial transmission data packet from the base station [S908]. At this time, the terminal receives the second initial transmission data packet using the downlink channel resource allocation information and the HARQ related information included in the first scheduling information. The terminal assumes that the HARQ process ID for the second initial transmission data packet is the second ID of the HARQ process IDs assigned in advance in step S901, that is, “1”, and sets the second initial transmission data packet. Decode the transmitted data packet.

  If the decoding of the second initial transmission data packet fails, the terminal transmits a NACK to the base station [S909]. The base station transmits the third scheduling information to the terminal using the SPS-C-RNTI assigned to the terminal [S910]. The third scheduling information includes the NDI set to “1”, and the terminal can recognize from the NDI that the third scheduling information is information for transmission of the retransmission data packet. The third scheduling information includes a HARQ process ID set to “1”, and the terminal receives a second data packet received using the third scheduling information from the HARQ process ID set to “1”. It can be seen that this is a retransmission packet of the initial transmission data packet.

  The terminal receives the second retransmission data packet as a retransmission packet for the second initial transmission data packet from the base station using the downlink channel resource allocation information and the HARQ related information included in the third scheduling information [S911. ]. The terminal combines and decodes the second retransmission data packet with the second initial transmission data packet, and if the decoding is successful, transmits the ACK to the terminal [S912].

  The base station transmits the fourth scheduling information to the terminal using the SPS-C-RNTI assigned to the terminal [S913]. The fourth scheduling information includes NDI set to “1”. The fourth scheduling information includes a HARQ process ID set to “0”, and the terminal receives a data packet received using the fourth scheduling information from the HARQ process ID set to “0”. It can be seen that this is a retransmission packet of one initial transmission data packet.

  The terminal receives a third retransmission data packet as a retransmission packet for the first initial transmission data packet from the base station using downlink channel resource allocation information and HARQ related information included in the fourth scheduling information [S914]. . The terminal combines and decodes the third retransmission data packet with the first initial transmission data packet and the first retransmission data packet, and transmits the ACK to the terminal if the decoding is successful [S915].

  When the base station needs to change the setting information for persistent scheduling, the base station transmits fifth scheduling information to the terminal [S916]. The fifth scheduling information includes the SPS-C-RNTI assigned to the terminal, and the NDI included in the fifth scheduling information is set to “0”. The terminal can grasp from the NDI set to “0” that the fifth scheduling information is information for setting persistent scheduling. Thereafter, the downlink channel resource allocation information and HARQ related information included in the fifth scheduling information are used for the terminal to receive the initial transmission data packet from the base station.

  FIG. 10 is a flowchart illustrating a procedure of a data transmission method according to still another embodiment of the present invention. In the embodiment of FIG. 10, when a predetermined event that has already been set occurs in the process of communication between the base station and the terminal, for example, data transmission / reception for a voice call, according to the persistent scheduling method, It is related to an example that makes it possible to take a quick. In the following, description will be made only to the extent necessary for understanding the embodiment of the present invention, and description of other general procedures necessary for communication between the network and the terminal will be omitted.

  Referring to FIG. 10, the base station allocates radio resources to the terminal in advance by a persistent scheduling method [S1001]. This radio resource allocation can be performed by the base station transmitting scheduling information for a voice call to a terminal in an RB setting process or a voice call setting process. The terminal performs a voice call using the scheduling information received in advance with the base station [S1002].

  When a predetermined event occurs in the terminal and / or base station during a voice call by the persistent scheduling method [S1003], the terminal performs a predetermined process [S1004]. The predetermined event relates to a situation in which smooth communication cannot be performed only with the radio resources already allocated to the terminal by the persistent scheduling method. The predetermined process performed by the terminal is related to enabling the terminal to take measures such as reallocation of radio resources by notifying the base station of the occurrence of the event.

  Examples of the predetermined event include a change in the codec mode used in the voice call, generation of data unrelated to the voice call during the voice call, for example, generation of SRB packet, RTCP or TCP data, full header packet in the middle of generation of the compressed header packet When the amount of generated data is larger than the amount of data that can be transmitted using radio resources allocated in advance by the persistent scheduling method, mutual switching between a voice interval and a silent interval occurred. Cases can be mentioned.

  Examples of the predetermined process performed by the terminal in step S1001 include the following.

  The first is that the terminal requests the base station to allocate additional radio resources or to allocate new radio resources by transmitting predetermined information through a channel that has already been set, for example, a D-SR channel. It is to do.

  Second, when there is no channel that has already been set, the terminal performs a random access process through a random access channel (RACH) and transmits predetermined information to the base station, thereby transmitting additional radio resources. Requesting assignment or requesting assignment of a new radio resource.

  Third, the terminal reports a buffer status report to the base station. That is, the terminal transmits information about the amount of data stored in its own buffer to the base station, thereby requesting additional radio resource allocation or requesting new radio resource allocation.

  In the embodiment described above, the components and features of the present invention are combined in a predetermined form. Each component or feature should be considered optional unless stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features, and some components and / or features may be combined to form an embodiment of the present invention. The order of operations described in the embodiments of the present invention can be changed. Some configurations or features of one embodiment may be included in another embodiment or may replace a corresponding configuration or feature of another embodiment. It is obvious that claims which are not explicitly cited in the claims can be combined to constitute an embodiment, or new claims can be made by amendment after application.

In this document, the embodiments of the present invention have been described mainly on the data transmission / reception relationship between the terminal and the base station. The specific operation assumed to be performed by the base station in this document may be performed by an upper node in some cases. That is, it is apparent that various operations performed for communication with a terminal in a network including a large number of network nodes including a base station can be performed by the base station or another network node other than the base station. It is. The term “base station” may be replaced with terms such as a fixed station, Node B, eNode B (eNB), access point, and the like. In addition, the “terminal” may be a UE (User Equipment), an MS (Mobile Station), an MSS (Mobile
It is possible to substitute terms such as Subscriber Station).

  Embodiments according to the present invention may be implemented by various means such as hardware, firmware, software, or a combination thereof. In the case of implementation by hardware, one embodiment of the present invention includes one or more ASICs (application specific integrated circuits), DSPs (digital signal processing), DSPDs (digital signal processing), DSPs (digital signal processing), DSPs (digital signal processing). , FPGAs (Field Programmable Gate Arrays), processors, controllers, microcontrollers, microprocessors, and the like.

  In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, or the like that performs the functions or operations described above. The software code is stored in a memory unit and can be driven by a processor. The memory unit is provided inside or outside the processor, and can exchange data with the processor by various known means.

  It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the characteristics of the present invention. Therefore, the above detailed description should not be construed as limiting in any way, and should be considered exemplary. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes that come within the equivalent scope of the invention are included in the scope of the invention.

Claims (14)

A data communication method for user equipment (UE) in a wireless communication system, comprising:
The method
Receiving at a user equipment first scheduling information from a network, wherein the scheduling information includes a new data indicator (NDI) and allocation information;
If the NDI related to the value of the first scheduling information is the first value, determining that the allocation information is initial allocation information according to semi-persistent scheduling;
Receiving an initial transmission data packet according to the first scheduling information, wherein a HARQ process identifier associated with the initial transmission data packet is pre-assigned by the network before receiving the scheduling information; And that
Receiving second scheduling information from the network, wherein the second scheduling information includes NDI and allocation information;
If the NDI associated with the second scheduling information has a second value, determining that the next received data packet is a retransmission data packet;
Receiving the retransmission data packet, wherein the second scheduling information further comprises a HARQ process identifier associated with the retransmission data packet.   The method according to claim 1, wherein the second scheduling information includes downlink resource allocation information and HARQ related information. The HARQ process identifier associated with the received initial transmission data packet is sequentially set to each HARQ process identifier of two or more corresponding HARQ process identifiers when two or more HARQ process identifiers exist. The method of claim 1, wherein:   The method of claim 1, wherein the first and second scheduling information is received for a first UE. The first and second scheduling information is Semi-Persistent Scheduling. C-RNTI is included, and the first UE identification is the Semi-Persistent Scheduling. The method of claim 4, defined by C-RNTI.   When the first and second scheduling information is received for second UE identification, the scheduling information is used as resource allocation information according to dynamic scheduling to receive a downlink data packet from the network. The method according to claim 4, wherein the method is used. Wherein the first and second scheduling information comprises Semi-Persistent Scheduling C-RNTI, the second UE identity is defined by C-RNTI, the method according to claim 6. A user equipment (UE) for use in a wireless communication system,
The user equipment is
Means for receiving first scheduling information from the network, wherein the scheduling information includes a new data indicator (NDI) and allocation information;
Means for determining that the allocation information is initial allocation information according to semi-persistent scheduling when the NDI associated with the value of the first scheduling information is the first value;
Means for receiving an initial transmission data packet according to the first scheduling information, wherein a HARQ process identifier associated with the initial transmission data packet is pre-assigned by the network before receiving the scheduling information; Means, and
Means for receiving second scheduling information from the network, wherein the second scheduling information includes NDI and allocation information;
Means for determining that the next received data packet is a retransmitted data packet if the NDI associated with the second scheduling information has a second value;
Means for receiving a retransmission data packet, wherein the second scheduling information further comprises a HARQ process identifier associated with the retransmission data packet.   The user equipment according to claim 8, wherein the second scheduling information includes downlink resource allocation information and HARQ related information. The HARQ process identifier associated with the received initial transmission data packet is sequentially set to each HARQ process identifier of two or more corresponding HARQ process identifiers when two or more HARQ process identifiers exist. 9. The user equipment according to claim 8, wherein: The user equipment according to claim 8, wherein the first and second scheduling information is received for a first UE. The first and second scheduling information is Semi-Persistent Scheduling. C-RNTI is included, and the first UE identification is the Semi-Persistent Scheduling. The user equipment according to claim 11, defined by C-RNTI. If the first and second scheduling information is received for second UE identification, the scheduling information is used as resource allocation information according to dynamic scheduling to receive downlink data packets from the network. The user equipment according to claim 11, which is used. The first and second scheduling information is Semi-Persistent Scheduling. It includes a C-RNTI, the second UE identity is defined by C-RNTI, the user equipment according to claim 13.

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