ES2602431T3 - Data communication method in a wireless communication system, which includes indicators to control the process - Google Patents

Abstract

A method of data transmission by a user equipment, UE, in a wireless communication system, the method comprising: receiving a first programming information from a network, the first programming information that includes a first resource allocation information uplink channel, UL, a first UE identifier and a first new data indicator, NDI, the first UE identifier indicating that the first programming information is associated with persistent programming; transmit an initial transmission data packet to the network using the first channel resource allocation information when the first NDI has a value of "0"; receive a negative acknowledgment, NACK, in response to the initial transmission data packet from the network; receiving a second programming information from the network, the second programming information that includes a second channel resource allocation information, an UE identifier and a second NDI; determine that the second programming information will be used to transmit a retransmission packet of the initial transmission data packet when the UE identifier included in the second programming information is identical to the first UE identifier and the second NDI has a value of "one"; and transmitting the relay packet to the network using the second channel resource allocation information.

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DESCRIPTION

Method of data communication in a wireless communication system, which includes indicators to control the process

Technical field

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

Background of the technique

In a wireless communication system that uses multiple carriers, such as an orthogonal frequency division multiple access (OFDMA) or a single carrier frequency division multiple access (SC-FDMA), the radio resources are a set of continuous subcarriers and are defined by a time-frequency region in a two-dimensional sphere. A time-frequency region is a rectangular shape sectioned by time and subcarrier coordinates. In other words, a time-frequency region could be a rectangular shape sectioned by at least one symbol on a time axis and a plurality of subcarriers on a frequency axis. Such a time-frequency region can be assigned to an uplink for a specific user equipment (UE) or a base station can transmit the time-frequency region to a specific user equipment on a downlink. In order to define such a time-frequency region in the two-dimensional sphere, the number of OFDM symbols and the number of continuous subcarriers must be given starting from a point that has a displacement from a reference point.

An evolved universal mobile telecommunications system (E-UMTS) that is currently being discussed uses a 10 ms radio frame comprising 10 subframes. That is, a subframe includes two continuous intervals. An interval is 0.5 ms long. Also, a subframe comprises a plurality of OFDM symbols and a part (eg, first symbol) of the plurality of OFDM symbols can be used for transmission of control information L1 / L2.

FIG. 1 illustrates an example of a physical channel structure used in the E-UMTS. In FIG. 1, a subframe comprises a region of transmission of control information L1 / L2 (shaded part) and a region of data transmission (unshaded part).

FIG. 2 illustrates a general method of data transmission in the E-UMTS. In the E-UMTS, a tubed automatic repetition request (HARQ) scheme, which is one of the data retransmission schemes, is used to improve the maximum flow, thereby allowing desirable communication.

With reference to FIG. 2, the base station transmits downlink programming information (hereinafter referred to as 'DL programming information') through DL control channel L1 / L2, for example, a physical downlink control channel (PDCCH), to transmit data to a user equipment according to the HARQ scheme. The DL programming information includes a user equipment identifier (UE ID) or group identifier (group ID) of the user equipment, location and duration information (resource allocation and allocation time) of radio resources assigned for downlink data transmission, modulation mode, payload size, transmission parameters such as MIMO related information, HARQ process information, redundancy version and new data indicator.

In order to notify that DL programming information is transmitted through the PDCCH for which user equipment, the user equipment identifier (or group identifier) is transmitted, for example, a temporary radio network identifier (RNTI). The RNTI can be classified into a dedicated RNTI and a common RNTI. The dedicated RNTI is used for transmission and reception of data to and from a user equipment of which information is registered with a base station. The common RNTI is used if the communication is made with user equipment, which is not assigned with a dedicated RNTI since its information is not registered with the base station. Alternatively, the common RNTI is used for transmission and reception of information commonly used for a plurality of user equipment, such as system information. For example, examples of the common RNTI include RA-RNTI and T-C-RNTI, which are used during a random access procedure through a random access channel (RACH). The user equipment identifier or group identifier can be transmitted in a type of CRC masking (Cyclic Redundancy Check) in DL programming information transmitted through the PDCCH.

User equipment located in a specific cell monitors the PDCCH through the L1 / L2 control channel using its RNTI information and receives DL programming information through the corresponding PDCCH if they successfully perform CRC decoding through their RNTI . The user equipment receives downlink data transmitted to them through a shared physical downlink channel (PDSCH) indicated by the received DL programming information.

A programming mode can be classified into a dynamic programming mode and a persistent or semi-persistent programming mode. The dynamic programming mode will transmit programming information to a

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Specific user equipment through the PDCCH provided that the allocation of uplink or downlink resources is required for the specific user equipment. Persistent programming mode means that the base station assigns downlink or uplink programming information to the user equipment statically during an initial call establishment such as a radio bearer establishment. In this document, the term "persistent programming" has the same meaning with "semi-persistent programming."

In case of persistent programming, the user equipment transmits or receives data using programming information previously assigned to the base station without using DL programming information or UL programming assigned from the base station. For example, if the base station previously sets a specific user equipment to allow the user equipment to receive downlink data through an RRC signal and a radio resource "A" according to a transport format "B" and a period " C "during the establishment of a radio bearer, the user equipment may receive downlink data transmitted from the base station using information" A "," B "and" C ". Similarly, even if the user equipment transmits data to the base station, the user equipment can transmit uplink data using a previously defined radio resource according to uplink programming information previously assigned. Persistent programming is a programming mode that can be applied well to a service of which traffic is regular, such as voice communication.

An AMR codec used in voice communication, that is, voice data generated through the voice codec has a special feature. That is, voice data is classified into a conversation broadcast and a period of silence. Conversation broadcasting involves a period of generated voice data while a person is actually speaking and the period of silence implies a period of generated voice data while a person does not speak. For example, voice packets, which include voice data in the conversation broadcast, are generated by 20 ms and silence packets (SID), which include voice data in the silence period, are generated by 160 ms.

If persistent programming is used for voice communication, the base station will establish radio resources according to the conversation broadcast. That is, the base station will previously establish radio resources to transmit and receive uplink or downlink data to and from the user equipment in a 20 ms interval during a call establishment using a feature of which voice packets are generated by 20 ms. The user equipment receives downlink data or transmits uplink data using radio resources, which are previously set for 20 ms.

The 3GPP Draft R2-0808293, entitled “Issues on VoIP support,” describes options for signaling persistent resource allocation using the PDCCH channel on 3GPP LTE systems.

The draft 3GPP R1-080299, entitled “Signaling of persistent allocation on PDCCH”, describes persistent allocation signaling in the downlink and uplink in 3GPP LTE systems.

The draft of 3GPP N ° R1-080008, entitled “LS on NDI vs. RV ”provides a comparison between an NDI approach and an RV approach for an indicator as to whether a new transmission or retransmission should be sent.

Description of the invention

As described above, when the uplink or downlink resources for voice communication are programmed using persistent programming, the period of silence is required to be converted to the conversation broadcast. On the other hand, if the conversation broadcast is converted to the silence period, it is required that the base station must quickly change radio resource allocation information, which is previously assigned, to reallocate adequate radio resources for a trait of the converted period. In addition to the mutual conversion between the silence period and the conversation broadcast, if an event, such as conversion between AMR codec modes during voice communication and conversion between a period in which complete header packets are generated in a PDCP entity and a period in which compressed header packets are generated within it, a problem occurs in which data generated after the event occurs cannot be transmitted or received efficiently using previously allocated radio resources according to persistent programming.

In the wireless communication system, communication can be carried out in such a way that dynamic programming and persistent programming are applied simultaneously to a user equipment. For example, if voice communication is performed according to a VoIP service according to the HARQ scheme, persistent programming is applied to initial transmission packets and dynamic programming is applied to retransmission packets. Also, if the user equipment simultaneously uses two or more services, persistent programming can be applied to one service and dynamic programming can be applied to the other service. In these cases, it is required that the user equipment must definitively identify if programming information transmitted to it depends on which programming mode or if the programming information is for the configuration of a persistent programming or for transmitting / receiving retransmission packets or If the programming information is for what service.

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Accordingly, the present invention is directed to a method of data communication in a wireless communication system, which substantially obviates one or more problems due to limitations and disadvantages of the related technique.

An object of the present invention is to provide a method of data communication in a wireless communication system, in which radio resources can be efficiently used in the wireless communication system.

Another object of the present invention is to provide a method of data communication in a wireless communication system, in which a user equipment can clearly differentiate programming information for the configuration of a persistent programming from programming information to transmit / Receive retransmission data packets.

Another additional object of the present invention is to provide a method of data communication in a wireless communication system, in which a user equipment can identify HARQ process identifiers for initial transmission data packets of data packets during HARQ transmission of link descending that is performed in an asmchronous mode when persistent programming is used.

In order to achieve these objects and other advantages and according to the purpose of the invention, as incorporated herein and described extensively herein, in one aspect of the present invention, data communication methods are provided in a user equipment, UE, in a wireless communication system as set forth in the appended claims.

In another aspect of the present invention, a user equipment configured to carry out a method according to any of the appended claims is provided.

In this specification, "programming information" means information transmitted from a network to a user equipment to allocate downlink and / or uplink resources to the user equipment. Programming information may be transmitted on a control channel and include downlink and / or uplink resource allocation information and information related to HARQ. The term "programming information" may be substituted with another term that has normally been used in the technique to which the present invention pertains, such as "resource allocation information", "downlink or uplink assignment information. "And" downlink / uplink assignment ", etc.

Brief description of the drawings

FIG. 1 is a diagram illustrating an example of a physical channel structure used in an E-UMTS (Universal Mobile Telecommunications System Evolved);

FIG. 2 is a diagram illustrating a general method of data transmission in an E-UMTS;

FIG. 3 is a diagram illustrating a network structure of an E-UMTS;

FIG. 4 is a schematic view illustrating an E-UTRAN (Universal Network of Evolved Terrestrial Radio Access).

FIG. 5A and FIG. 5B are diagrams illustrating a structure of a radio interface protocol between a user equipment (UE) and the E-UTRAN, in which FIG. 5A is a schematic view of a control plane protocol and FIG. 5B is a schematic view of a user plane protocol;

FIG. 6 is a flow chart illustrating a method of a method of data communication according to an embodiment of the present invention;

FIG. 7 is a flow chart illustrating a method of a method of data communication according to another embodiment of the present invention; Y

FIG. 8 is a flow chart illustrating a method of a method of data communication according to another embodiment of the present invention.

FIG. 9 is a flow chart illustrating a method of a method of data communication according to another embodiment of the present invention.

FIG. 10 is a flow chart illustrating a method of a method of data communication according to another embodiment of the present invention.

Best way to carry out the invention

Hereinafter, the structures, operations and other features of the present invention will be readily understood by the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. The

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Embodiments described later are examples in which the technical features of the present invention apply to an E-UMTS (Universal Mobile Telecommunications System Evolved).

FIG. 3 illustrates a network structure of an E-UMTS. An E-UMTS is a system that evolves from the conventional WCDMA UMTS and its basic standardization is currently managed by the 3GPP (3rd Generation Cooperation Project). The E-UMTS can also be called the LTE (Long Term Evolution) system.

With reference to FIG. 3, an E-UTRAN includes base stations (hereinafter, known as 'eNode B' or 'eNB'), in which the respective eNBs are connected to each other through the X2 interface. Also, each of the eNBs is connected to a user equipment (UE) through a radio interface and connected to an EPC (Evolved Packet Nucleus) through the S1 interface. The EPC includes a system architecture mobility / evolution management entity (MME / SAE) gateway.

The layers of a radio interface protocol between a user equipment and a network can be classified into a first layer L1, a second layer L2 and a third layer L3 based on the three lowest layers of the OSI standard model (interconnection of open systems) widely known in communication systems. A physical layer belonging to the first layer L1 provides an information transfer service that uses a physical channel. A radio resource control (hereinafter abbreviated as 'RRC') located in the third layer plays a role in controlling the radio resources between the user equipment and the network. For this, the RRC layer allows RRC messages to be exchanged between the UE and the network. The RRC layer can be placed distributively in network nodes that include a Node B, an AG and the like or it can be independently located either in Node B or in the AG.

FIG. 4 is a schematic view illustrating an E-UTRAN (UMTS terrestrial radio access network). In FIG. 4, a shaded part represents functional entities of a user plane and an unshaded part represents functional entities of a control plane.

FIG. 5A and FIG. 5B illustrate a structure of a radio interface protocol between the user equipment (UE) and the E-UTRAN, in which FIG. 5A is a schematic view of a control plane protocol and FIG. 3B is a schematic view of a user plane protocol. With reference to Fig. 5A and FIG. 5B, a radio interface protocol horizontally includes a physical layer, a data link layer and a network layer and vertically includes a user plane for data information transfer and a control plane for signal transfer. The protocol layers in FIG. 5A and FIG. 5B can be classified into L1 (first layer), L2 (second layer) and L3 (third layer) based on the three lowest layers of the open system interconnection standard (OSI) model widely known in communications systems.

The physical layer as the first layer provides an information transfer service to a higher layer using physical channels. The physical layer (PHY) is connected to a medium access control layer (hereinafter abbreviated as 'MAC') above the physical layer through transport channels. The data is transferred between the media access control layer and the physical layer through the transport channels. On the other hand, the data is transferred between different physical layers and, more particularly, between a physical layer of one transmission side and the other physical layer of a reception side through the physical channels. The physical channel of the E-UMTS is modulated according to an orthogonal frequency division multiplexing (OFDM) scheme and time and frequency are used as radio resources.

The media access control layer (hereinafter abbreviated as 'MAC') of the second layer provides a service to a radio link control layer (hereinafter abbreviated as 'RLC') above the layer MAC through logical channels. The RLC layer of the second layer supports reliable data transfer. In order to efficiently transmit data using IP packets (for example, IPv4 or IPv6) within a radiocommunication period that has a narrow bandwidth, a second layer PDCP layer (L2) performs header compression to reduce the size of unnecessary control information.

A radio resource control layer (hereinafter abbreviated as 'RRC') located in the lower part of the third layer is defined only in the control plane and is associated with configuration, reconfiguration and release of radio bearers (in hereafter, abbreviated as 'RB') to be in charge of the control of the logical, transport and physical channels. In this case, the RB assumes a service provided by the second layer for data transfer between the user equipment and the UTRAN.

As downlink transport channels that transport data from the network to user equipment, a broadcast channel (BCH) that conveys system information, a search channel (PCH) that carries a search message and a channel are provided Downlink shared (SCH) that carries user traffic or control messages. Traffic or control messages of a downlink multicast or broadcast service may be transmitted through the downlink SCH or an additional downlink multicast channel (MCH). Meanwhile, as uplink transport channels that transport data from user equipment to the network, a random access channel (RACH) that carries an initial control message and an uplink shared channel (UL-SCH) are provided. ) that carries user traffic or control message.

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As logical channels located above the transport channels and correlated with the transport channels, a broadcast control channel (BCCH), a search control channel (PCCH), a common control channel (CCCH) are provided, a multicast control channel (MCCH) and a multicast traffic channel (MTCH).

In the E-UMTS system, an OFDM is used in the downlink and a single carrier frequency division multiple access (SC-FDMA) in the uplink. The OFDM scheme that uses multiple carriers assigns resources per unit of multiple subcarriers including a group of carriers and uses orthogonal frequency division multiple access (OFDMA) as the access scheme.

FIG. 6 is a flow chart illustrating a method of a method of data transmission according to an embodiment of the present invention. According to the embodiment of FIG. 6, the user equipment (UE) receives an SRB packet according to dynamic programming while voice data (VoIP packet) is received according to persistent programming. Hereinafter, a description will be made only if it is necessary for the understanding of the realization of the present invention and a description of a general procedure required for communication between a network and a user equipment will be omitted.

With reference to FIG. 6, eNode B (eNB) assigns two user equipment identifiers to the user equipment [S61]. Examples of the two user equipment identifiers include a C-RNTI and an SPS-C-RNTI (Semi-Persistent Programming). However, the two user equipment identifiers will not be limited to the previous examples. For example, a temporary C-RNTI and RA-RNTI can be used as the two user equipment identifiers. The two user equipment identifiers can be assigned to the user equipment over the network during a random access procedure, call establishment procedure or radio bearer establishment procedure (RB). Also, the two user equipment identifiers can be assigned simultaneously or individually.

The eNode B transmits an initial transmission VoIP packet V1 to the user equipment through the PDSCH [S62]. The VoIP initial transmission packet V1 assumes a voice packet that is not a retransmission packet in case the HARQ scheme is used. If the user equipment successfully fails to receive the initial transmission VoIP packet V1, that is, if the user equipment stops decoding the initial transmission VoIP packet V1, the user equipment transmits a NACK signal to the eNode B through of a physical uplink control channel (PUCCH)

[563]. Persistent programming is used for the transmission and reception of the initial transmission VoIP packet V1 and the NACK signal. In other words, the user equipment uses programming information previously assigned to eNode B without receiving DL programming information or UL programming information from eNode B whenever the initial transmission VoIP packet V1 is received or the signal is transmitted. NACK (or ACK signal). Therefore, the user equipment does not need to receive programming information in steps S62 and S63.

As described above, when the user equipment receives the initial transmission VoIP packet V1 or transmits the NACK signal (or the ACK signal), persistent programming is used. However, dynamic programming is used for transmission of a VoIP retransmission packet through eNode B. Therefore, after transmitting the NACK signal, the user equipment must first receive the programming information to receive the retransmission packet. To this end, the user equipment monitors the PDCCH of the control channel L1 / L2.

In FIG. 6, eNode B transmits the first programming information to the user equipment through the PDCCH

[564]. The first programming information is to allocate uplink and / or downlink channel resources to the user equipment according to dynamic programming. The first programming information may include DL programming information and UL programming information. The first programming information is supposed to be programming information to transmit SRB packets to the user equipment.

Since the user equipment transmits a NACK for the initial transmission VoIP packet transmitted from eNode B in step S63, the user equipment monitors the PDCCH to receive a VoIP retransmission packet related to the initial transmission VoIP packet V1. However, if the programming information to receive the VoIP retransmission packet is not transmitted through the PDCCH but the first programming information to transmit the SRB packet is transmitted as step S64, according to the related technique, the user equipment You can misinterpret the first programming information as the programming information to receive the VoIP relay package. In this case, the user equipment determines the initial transmission SRB packet received as the VoIP retransmission packet using the first programming information and combines the packet with the initial transmission VoIP packet according to the HARQ scheme to attempt the recovery of the packet, whereby an error occurs.

In order to avoid the error, according to the embodiment of FIG. 6, the programming information transmitted through the PDCCH includes information indicating that the corresponding programming information is transmitted according to a specific programming mode. In the embodiment of FIG. 6, the two user equipment identifiers assigned in step S61 are used as the indication information. In other words, the C-RNTI can be used as information indicating that the programming information is transmitted according to dynamic programming while the SPS-C-RNTI can be used as information indicating that the information

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Programming to transmit the retransmission packet related to the initial transmission packet is transmitted according to persistent programming. That is, in FIG. 6, the SPS-RNTI is used to indicate that the corresponding programming information is programming information for transmitting the VoIP retransmission packet for the initial transmission VoIP packet transmitted according to persistent programming. The C-RNTI or SPS-C-RNTI can be transmitted either by being included in the programming information or by being masked with CRC with at least part of the programming information.

In FIG. 6, if the C-RNTI is included in the programming information received in step S64, the user equipment recognizes that the programming information is programming information according to the dynamic programming and receives an initial transmission SRB packet S1 transmitted from the eNode B using the programming information [S65].

The eNode B transmits a second programming information to the user equipment through the PDCCH to transmit a V2 retransmission packet associated with the initial transmission VoIP packet V1, in which the second programming information includes the SPS-C-RNTI [ S66]. If the user equipment receives the second programming information that includes the SPS-C-RNTI, the user equipment receives the VoIP retransmission packet V2, which is transmitted from the eNode B, using the second programming information [S67]. The user equipment combines the VoIP retransmission packet V2 received with the VoIP packet initial transmission V1 according to the HARQ scheme to retrieve the VoIP packet [S68]. If the user equipment successfully recovers the VoIP packet, the user equipment transmits an ACK signal to eNode B [S69]. The VoIP packet involves a data packet intended to be transmitted from eNode B to the user equipment. The VoIP package is divided into the initial transmission VoIP package V1 and the VoIP retransmission package V2 and then transmitted to the user equipment according to the HARQ scheme.

In the embodiment of FIG. 6, the first programming information and the second programming information may also include identification information that can identify whether the data packet transmitted from eNode B to the user equipment according to the first programming information and the second programming information is a Initial transmission package or retransmission package. The identification information may be included in the first programming information and the second programming information such that a specific field of the first programming information and the second programming information is set to a value that has been previously set. For example, a first retransmission packet, a second retransmission packet and a third retransmission packet can be identified such that specific values such as 1, 2 and 3 are set in a redundancy version (RV) field included in the first programming information and the second programming information. In addition to the RV field, other fields included in the first programming information and the second programming information, for example, at least one of a HARQ process ID field, a format field, an MCS field, an NDI (indicator of new data), a TPC field, a “DC Shift for DMRS” field, a “TX antenna” field and a CQI request field are set to a specific value, so that the value can be used as the information of identification.

In the embodiment of FIG. 6, if the specific field included in the programming information, for example, the HARQ process ID field is set to a specific value, which is previously defined, the user equipment, which has received the corresponding programming information, considers that the corresponding programming information is configuration information for persistent programming. Therefore, the user equipment that has received the programming information that includes the HARQ process ID field set to the specific value transmits or receives data according to the persistent programming using the corresponding programming information until a radio bearer establishment is released or call establishment or other programming information is updated.

In this case, the user equipment, which has received the programming information that includes the HARQ process ID field set to a value other than the specific value, uses the programming information for a corresponding transport time interval (TTI) or use the programming information until a HARQ processor related to the programming information reaches the maximum number of transmission times.

FIG. 7 is a flow chart illustrating a method of a method of data transmission according to another embodiment of the present invention. According to the embodiment of FIG. 7, in the same manner as the embodiment of FIG. 6, the user equipment (UE) receives SRB packets according to dynamic programming while voice data (VoIP packets) are received according to persistent programming. The embodiment of FIG. 7 is to identify the HARQ scheme according to dynamic programming from the HARQ scheme according to persistent programming. Hereinafter, a description will be made only if it is necessary for the understanding of the realization of the present invention and a description of a general procedure required for communication between the network and the user equipment will be omitted.

As described above, when the user equipment receives an initial transmission VoIP packet V1 or transmits the NACK signal (or ACK signal) for the initial transmission VoIP packet, persistent programming is used. However, dynamic programming is used for the transmission of VoIP relay packets by eNode B. Therefore, after transmitting the NACK signal for the initial transmission VoIP packet,

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The user team must first receive programming information through the PDCCH to receive a VoIP relay packet from eNode B.

If the user equipment receives the package according to dynamic programming, for example, an SRB package while voice communication is being made, the user equipment needs to receive the programming information identifying the programming information transmitted for the transmission and reception of the package VoIP retransmission based on the programming information transmitted to receive the SRB package. For this purpose, in the embodiment of FIG. 7, a HARQ process ID field included in the programming information transmitted for the transmission and reception of the VoIP retransmission packet is set to at least one specific value. In the embodiment of FIG. 7, if the HARQ process ID field is set to '101', '110' and '111', the corresponding programming information corresponds to programming information transmitted for the transmission and reception of the VoIP retransmission packet. The eNode B and the user equipment can program that the HARQ process ID field can be previously set to the specific values during an initial access procedure, a call establishment procedure or an RB establishment procedure, to represent the Programming information transmitted for the transmission and reception of the VoIP retransmission package.

With reference to FIG. 7, eNode B (eNB) transmits the initial transmission VoIP packet V1 to the user equipment (UE) [S71]. The initial transmission VoIP packet assumes a voice data packet is not a retransmission packet. If the user equipment stops receiving the initial transmission VoIP packet successfully, the user equipment transmits a NaCk to eNode B [S72].

The eNode B transmits the first programming information to the user equipment through the PDCCH to transmit an initial transmission SRB packet S1 [S73]. If the value set in the HARQ process ID field included in the first programming information is not a specific value, which was previously defined, the user equipment recognizes that the first programming information is not for the retransmission packet associated with the V1 initial transmission VoIP package. Since the HARQ process ID field of the first programming information is set to '000' not the value that was previously programmed, the user equipment receives the initial transmission SRB packet S1, which is transmitted from eNode B, using the first programming information [S74]. If the initial transmission SRB packet S1 is not successfully decoded, the user equipment transmits a NACK to eNode B [S75].

The eNode B transmits the second programming information to the user equipment through the PDCCH to transmit a first VoIP retransmission packet V2 associated with the initial transmission VoIP packet V1 to the user equipment, in which the second programming information includes the HARQ process ID field set to '101' which is one of the specific values previously defined [S76]. The user equipment may identify that the second programming information is programming information for a retransmission packet associated with the initial transmission VoIP packet V1 after identifying that the HARQ process ID field of the second programming information has been set. to the previously defined value.

The eNode B transmits the first VoIP relay V2 packet to the user equipment according to the second programming information and the user equipment receives the first VoIP relay packet V2 using the second programming information [S77]. The user equipment combines the first VoIP relay V2 packet with the VoIP initial transmission packet V1 according to the HARQ scheme and decodes the packet [S78]. If the user equipment stops decoding the VoIP packet successfully, the user equipment transmits a NACK to eNode B [S79].

The eNode B transmits the third programming information to the user equipment through the PDCCH to transmit the retransmission packet associated with the initial transmission SRB packet S1 to the user equipment, wherein the third programming information includes an ID field of HARQ process set to '000' [S80]. The eNode B transmits the SRB retransmission pack S2 to the user equipment according to the third programming information and the user equipment receives the first SRB retransmission pack S2 using the third programming information [S81]. The user equipment combines the received SRB retransmission packet S2 with the initial transmission SRB packet S1 and decodes an SRB packet [S82]. If the user equipment successfully decodes the packet, the user equipment transmits an ACK to eNode B [S83].

The eNode B transmits a fourth programming information to the user equipment through the PDCCH to transmit a retransmission packet associated with the first VoIP relay packet V2, wherein the fourth programming information includes the HARQ process ID field set to '110' [S84]. The user team may recognize that the fourth programming information is programming information for a retransmission packet associated with the first VoIP relay packet V2 after identifying that the HARQ process ID field of the fourth programming information has been set. to the previously defined value.

The eNode B transmits a second VoIP retransmission packet V3, which is a retransmission packet of the first VoIP retransmission packet V2, to the user equipment according to the fourth programming information and the user equipment receives the second VoIP retransmission packet V3 using the fourth programming information [S85]. The user equipment combines the second VoIP retransmission pack V3, the first VoIP retransmission packet

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V2 and the initial transmission VoIP packet V1 with each other according to the HARQ scheme and decodes the VoIP packet [S86]. If the user equipment successfully decodes the VoIP packet, the user equipment transmits an AcK to eNode B [S87].

In the same way as the embodiment of FIG. 7, if the HARQ process ID field is set to a plurality of specific values to represent the transmitted programming information for the transmission and reception of a VoIP retransmission packet, the plurality of specific values may be included in the ID field. of the HARQ process in consecutive order or a randomly selected specific value can be included in the HARQ process ID field. Instead of the HARQ process ID field, another field of programming information can be set to the specific value to indicate that the programming information has been transmitted for the transmission and reception of the VoIP retransmission packet.

In the embodiment of FIG. 7, the HARQ process ID field included in the programming information is set to the specific value to indicate that the corresponding programming information is programming information for the retransmission packet associated with the initial transmission VoIP packet transmitted according to persistent programming. .

According to another embodiment, if a specific field included in the programming information, for example, the HARQ process ID field is set to the previously defined value, the user equipment, which has received the corresponding programming information, considers the information of corresponding programming as configuration information for persistent programming. Therefore, the user equipment that has received the programming information that includes the HARQ process ID field set to the predefined value transmits or receives data according to the persistent programming using the corresponding programming information until a radio bearer establishment is released or a call establishment or other programming information is updated.

In this case, the user equipment, which has received the programming information that includes the HARQ process ID field set to a value other than the predefined values, uses the programming information for a transport time interval (TTI) corresponding or use the programming information until a HARQ processor related to the programming information reaches the maximum number of transmission times.

FIG. 8 is a flow chart illustrating a method of communicating data according to another embodiment of the present invention. The embodiment according to FIG. 8 is directed to a method of transmitting uplink data, for example voice data, from a user equipment (UE) to an eNode B (eNB). Hereinafter, a description will be made only if it is necessary for the understanding of the realization of the present invention and a description of a general procedure required for communication between the eNB and the EU will be omitted.

As described above, even in the case that an initial transmission data packet is transmitted in the persistent programming mode, the dynamic programming mode is used for a retransmission packet for the initial transmission data packet. In addition, an SPS-C-RNTI is used both for the first programming information for the configuration of persistent programming and for the second programming information to transmit a retransmission packet associated with an initial transmission packet that has been transmitted in the persistent programming mode. In this regard, a field or indicator included in the programming information can be used to differentiate the first programming information from the second programming information. In the embodiment of FIG. 8, a new data indicator (NDI) is used. However, another field or indicator other than the NDI can be used. For example, a redundancy version (RV) field can be set to a predefined value to indicate programming information for persistent programming configuration.

In this specification, the "initial transmission data packet" assumes a packet that is initially transmitted by a HARQ process in HARQ transmission. On the other hand, the "retransmission data packet" means a data packet that is retransmitted by a transmitting side after receiving a NACK from a receiving side in response to the initial transmission data packet or other data packet of Relay

With reference to FIG. 8, the eNB transmits a first programming information for the configuration of persistent programming to the UE in a physical data control channel (PDCCH) [S801]. The first programming information includes uplink resource allocation information and information related to HARQ. The first programming information includes an SPS-C-RNTI that has previously been assigned to the UE and an NDI that has the value of "0". The SPS-C-RNTI can be included in the first programming information in a type of CRC masking. The UE can realize on the basis of the SPS-C-RNTI that the first programming information is related to persistent programming and based on the NDI that has the value of "0" that the first programming information is for the configuration of persistent programming. The UE transmits uplink data packets periodically based on the uplink resource allocation information and the HARQ related information included in the first programming information. The first programming information is used until a related radio bearer (RB) is released or the first programming information is reconfigured with other programming information.

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After receiving the first programming information, the UE transmits a first initial transmission data packet to the eNB using the uplink resource allocation information [S802]. When the first initial transmission data packet is successfully decoded, the eNB transmits a NACK to the UE

[5803]. Thereafter, the eNB transmits a second programming information to the UE in the PDCCH

[5804]. The second programming information includes uplink resource allocation information and information related to HARQ for transmission of a retransmission data packet. In addition, the second programming information includes the SPS-C-RNTI and an NDI that has the value of "1" to indicate that the second programming information will be used for the transmission of a retransmission data packet.

The UE transmits a first retransmission data packet as a retransmission data packet for the first initial transmission data packet to the eNB using the uplink resource allocation information included in the second programming information [S805]. The eNB attempts to decode the first retransmission data packet by combining it with the first initial transmission data packet based on a HARQ scheme and transmits an ACK to the UE when the decoding of the packet is successful [S806].

The UE transmits a second initial transmission data packet to the eNB based on the uplink resource allocation information included in the first programming information [S807]. When the second initial transmission data packet is stopped decoding, the eNB transmits a NACK to the Ue [S808]. Thereafter, the eNB transmits a third programming information that includes the SPS-C-RNTI to the UE [S809]. The third programming information includes an NDI that has the value of "1" and the UE can realize based on the NDI that the third programming information will be used for transmission of a retransmission data packet. The UE transmits a second retransmission data packet using uplink resource allocation information included in the third programming information to the eNB as a retransmission packet for the second initial transmission data packet [S810]. The eNB attempts to decode the second retransmission data packet by combining it with the second initial transmission data packet based on the HARQ scheme and transmits an ACK to the UE when the decoding of the packet is successful [S811].

When it is necessary for the eNB to change the persistent programming configuration, the eNB transmits a fourth programming information to the UE [S812]. The fourth programming information includes the SPS-C-RNTI and an NDI that has the value of “0”. The UE can realize on the basis of the NDI that has the value of "0" that the fourth programming information will be used for configuration information of the persistent programming. After receiving the fourth programming information, the UE uses the uplink resource allocation information and the HARQ related information included in the fourth programming information to transmit initial transmission data packets to the eNB.

FIG. 9 is a flow chart illustrating a method of data communication according to another embodiment of the present invention. The embodiment according to FIG. 9 is directed to a method of receiving downlink data, for example voice data, in a user equipment (UE) from an eNode B (eNB). Hereinafter, a description will be made only if it is necessary for the understanding of the realization of the present invention and a description of a general procedure required for communication between the eNB and the EU will be omitted.

Except that the embodiment according to FIG. 9 relates to receiving downlink data while the embodiment according to FIG. 8 relates to transmitting uplink data, the basic structure of the embodiment according to FIG. 9 is similar to that of the embodiment according to FIG. 8. In spite of everything, in the embodiment according to FIG. 9, at least one HARQ process identifier (ID) among a plurality of available HARQ process identifiers (IDs) are previously assigned to the UE to be used to receive downlink data in persistent programming mode.

With reference to FIG. 9, the eNB assigns HARQ process IDs having the values of "0" and "1" between a plurality of available HARQ process IDs, for example, between the HARQ process IDs having the values of "0" to " 7 ”to the UE to receive downlink data packets according to persistent programming [S901]. HARQ process IDs can be assigned to the UE by being included in a radio resource control message (RRC) during a call establishment or radio bearer configuration (RB) procedure. Each of the HARQ process identifiers for initial downlink data packets received is set to each of the two HARQ process identifiers assigned one after another by the UE. Although two HARQ process IDs are assigned for persistent programming, a HARQ process ID or three or more HARQ process IDs can be previously assigned to a UE for persistent programming.

The eNB transmits a first programming information for the configuration of persistent programming to the UE in a physical data control channel (PDCCH) [S902]. The first programming information includes downlink resource allocation information and information related to HARQ. The first programming information includes an SPS-C-RNTI that has previously been assigned to the UE and an NDI that has the value of "0". The SPS-C-RNTI can be included in the first programming information in a type of CRC masking. The UE can realize on the basis of the SPS-C-RNTI that the first programming information is related to persistent programming and based on the NDI that has the value of "0" that the first programming information will be used for the configuration of persistent programming. The EU receives

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Periodically downlink data packets based on the downlink resource allocation information and the HARQ related information included in the first programming information. The first programming information may be used until a related radio bearer (RB) is released or the first programming information is reconfigured with other programming information.

After receiving the first programming information, the UE receives a first initial transmission data packet from the eNB using the downlink resource allocation information [S903]. The UE sets a HARQ process ID of the first initial transmission data packet to be the first HARQ process ID that has the value of "0" that was previously assigned in step S901 to decode the first transmission data packet. initial.

When the first initial transmission data packet is successfully decoded, the UE transmits a NACK to the eNB [S904]. The eNB transmits a second programming information to the UE in the PDCCH [S905]. The second programming information includes downlink resource allocation information and information related to HARQ to receive a retransmission data packet. A HARQ process ID included in the information related to HARQ has the value of “0”. The UE may realize based on the HARQ process ID that has the value of "0" that the second programming information will be used to receive a data packet that is a retransmission data packet associated with the first packet. of initial transmission data. In addition, the second programming information includes the SPS-C-RNTI and an NDI has the value of "1" to indicate that the second programming information will be used to receive a retransmission data packet.

The UE receives a first retransmission data packet as a retransmission data packet for the first initial transmission data packet from the eNB using the downlink resource allocation information and HARQ related information included in the second information. of programming [S906]. The UE attempts to decode the first retransmission data packet by combining it with the first initial transmission data packet based on a HARQ scheme and transmits a NACK to the eNB when the packet is stopped decoding [S907].

The UE receives a second initial transmission data packet from the eNB using the downlink resource allocation information and the HARQ related information included in the first programming information [S908]. The UE sets a HARQ process ID of the second initial transmission data packet to be the second HARQ process ID that has the value of "1" that was previously assigned in step S901 to decode the second transmission data packet. initial.

When the second initial transmission data packet is stopped decoding, the UE transmits a NACK to the eNB [S909]. The eNB transmits a third programming information that includes the SPS-C-RNTI to the UE [S910]. The third programming information includes an NDI that has the value of "1" and the UE may realize based on the NDI that the third programming information will be used to receive a retransmission data packet. In addition, the third programming information includes a HARQ process ID that has the value of “1”. The UE can realize based on the HARQ process ID that has the value of "1" that the third programming information is going to be used to receive a data packet that is a retransmission data packet associated with the second packet. of initial transmission data.

The UE receives a second retransmission data packet using downlink resource allocation information and HARQ related information included in the third programming information from the eNB as a retransmission packet for the second initial transmission data packet [S911 ]. The UE attempts to decode the second retransmission data packet by combining it with the second initial transmission data packet based on the HARQ scheme and transmits an ACK to the eNB when it is successful in decoding the packet [S912].

The eNB transmits a fourth programming information that includes the SPS-C-RNTI to the UE in the PDCCH [S913]. The fourth programming information includes an NDI that has the value of "1" to indicate that the fourth programming information will be used to receive a retransmission data packet. In addition, the fourth programming information includes a HARQ process ID that has the value of "0" and the UE can account based on the HARQ process ID that has the value of "0" that the fourth programming information goes to be used to receive a data packet that is a retransmission data packet associated with the first initial transmission data packet.

The UE receives a second retransmission data packet as a retransmission data packet for the first transmission data packet from the eNB using the downlink resource allocation information and the HARQ related information included in the fourth information of programming [S914]. The UE attempts to decode the second retransmission data packet by combining it with the first initial transmission data packet and the first retransmission data packet based on a HARQ scheme and transmits an ACK to the eNB when it is successful in decoding the packet. [S915].

When it is necessary for the eNB to change the persistent programming configuration, the eNB transmits a fifth programming information to the UE [S916]. The fifth programming information includes the SPS-C-RNTI and

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an NDI that has the value of "0". The UE can realize on the basis of the NDI that has the value of "0" that the fifth programming information will be used for the configuration of persistent programming. After receiving the fifth programming information, the UE uses downlink resource allocation information and HARQ related information included in the fifth programming information to receive initial transmission data packets from the eNB.

FIG. 10 is a flow chart illustrating a method of a method of data transmission according to another embodiment of the present invention. If a predetermined event occurs that is previously set while eNode B and the user equipment are transmitting and receiving data for communication, for example, voice communication according to the persistent programming mode, the embodiment of FIG. 10 is intended to quickly take follow-up measures regarding the corresponding event. Hereinafter, a description will be made only if it is necessary for the understanding of the realization of the present invention and a description of a general procedure required for communication between the network and the user equipment will be omitted.

With reference to FIG. 10, eNode B previously allocates radio resources to the user equipment according to the persistent programming mode [S1001]. The allocation of radio resources can be performed in such a way that eNode B transmits programming information for voice communication to the user equipment during the RB establishment procedure or the voice call establishment procedure. The user equipment performs voice communication with eNode B using the programming information previously received [S1002].

If a predetermined event occurs on the user equipment and / or eNode B while the user equipment is making voice communication according to the persistent programming mode [S1003], the user equipment performs a predetermined procedure [S1004]. The default event refers to a state that the user equipment cannot perform desirable communication using the previously assigned radio resources according to the persistent programming mode. The predetermined procedure performed by the user equipment is associated with taking measures such as reallocation of radio resources such that the user equipment notifies eNode B that the event has occurred.

Examples of the predetermined event include changing a codec mode used in voice communication, the generation of data that is unrelated to voice communication during voice communication, for example, SRB packets, RTCP data or TCP data, a case in that a complete header packet is generated while compressed header packets are generated, a case in which the amount of data that can be transmitted using the previously assigned radio resources according to the persistent programming mode is more than the amount of the data generated and a case in which a conversion occurs between a conversation broadcast and a period of silence.

Examples of the default procedure performed by the user equipment in step S81 are as follows.

First, the user equipment requests eNode B to allocate additional radio resources or new radio resources by transmitting predetermined information through a previously established channel, for example, a D-SR channel.

Second, if there is no previously established channel, the user team requests eNode B to allocate additional radio resources or new radio resources by performing a random access procedure through a random access channel (RACH) and transmitting predetermined information to eNode B .

Third, the user equipment transmits a temporary storage status report to eNode B. That is, the user equipment requests that eNode B allocate additional radio resources or new radio resources by transmitting information related to the amount of data stored in its temporary storage. .

The aforementioned embodiments are achieved by combining elements and structural features of the present invention in a predetermined type. Each of the structural elements or features should be considered selectively unless specified separately. Each of the structural elements or features can be carried out without being combined with other structural elements or features. Also, some structural elements and / or features may be combined with each other to constitute the embodiments of the present invention. The order of the operations described in the embodiments of the present invention can be changed. Some structural elements or features of one embodiment may be included in another embodiment or may be substituted with corresponding structural elements or features of another embodiment. On the other hand, it will be apparent that some claims that refer to specific claims can be combined with other claims with reference to other claims other than specific claims to constitute the embodiment or add new claims by means of correction after it is filed application.

The embodiments of the present invention have been described based on transmission and reception of data between eNode B and the user equipment. A specific operation that has been described as being performed by eNode B can be performed by a higher node of eNode B as the case may be. In other words, it will be apparent that various operations performed for communication with the user equipment in the network that includes a plurality of network nodes together with eNode B can be performed by eNode B or network nodes other than eNode B. The eNode B se

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You can substitute with terms such as a base station, a physical station, Node B and access point. Also, the user equipment can be replaced with terms such as mobile station (MS) and mobile subscriber station (MSS).

The embodiments according to the present invention can be implemented by various means, for example, hardware, microprogram, software or their combination. If the embodiment according to the present invention is implemented by hardware, the realization of the present invention can be implemented by one or more specific application integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD) , programmable logic devices (PLD), field programmable door arrangements (FPGA), processors, controllers, microcontrollers, microprocessors, etc.

If the embodiment according to the present invention is implemented by microprogram or software, the method of transmission and reception of data in the wireless communication system according to the realization of the present invention can be implemented by a type of a module, a procedure or a function , which performs functions or operations described as above. A software code can be stored in a memory unit and then operated by a processor. The memory unit can be placed inside or outside the processor to transmit and receive data to and from the processor through various means that are well known.

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 essential features of the invention. In this way, the above embodiments have to be considered in all aspects as illustrative and not restrictive. The scope of the invention should be determined by the reasonable interpretation of the appended claims and all changes that remain within the equivalent scope of the invention are included in the scope of the invention.

Industrial applicability

The present invention can be used in a wireless communication system such as a mobile communication system or a wireless Internet system.

Claims (3)

10 fifteen twenty 1. A method of data transmission by a user equipment, UE, in a wireless communication system, the method comprising: receive a first programming information from a network, the first programming information that includes a first uplink channel resource allocation information, UL, a first UE identifier and a first new data indicator, NDI, the first identifier from EU indicating that the first programming information is associated with persistent programming; transmit an initial transmission data packet to the network using the first channel resource allocation information when the first NDI has a value of "0"; receive a negative acknowledgment, NACK, in response to the initial transmission data packet from the network; receive a second programming information from the network, the second programming information that includes a second channel resource allocation information, an UE identifier and a second NDI; determine that the second programming information will be used to transmit a retransmission packet of the initial transmission data packet when the UE identifier included in the second programming information is identical to the first UE identifier and the second NDI has a value of "one"; Y transmit the retransmission packet to the network using the second channel resource allocation information. 2. The method of claim 1, wherein the first and second programming information also includes information related to HARQ. 3. A user equipment, UE, configured to carry out a method according to any one of claims 1 to 2.