Patent Description:
In a Long Term Evolution (Long Term Evolution, "LTE" for short) protocol, frame structures are classified into a frequency division duplex (Frequency Division Dual, "FDD" for short) frame structure and a time division duplex (Time Division Duplexing, "TDD" for short) frame structure, as shown in <FIG> and <FIG>. For the two types of frame structures, a basic unit is a <NUM> subframe including two timeslots (slot). Each timeslot occupies a time of <NUM>. A radio frame occupies a time of <NUM>. During transmission, a minimum time unit used to send data is a <NUM> subframe. That is, in a transmission process, to-be-transceived data of specific user equipment (User Equipment, "UE" for short) needs to be mapped onto a resource in a time unit of <NUM>, and data generated after mapping onto a <NUM> subframe is completed is transmitted. Further, in a design of an entire LTE system, considering limitations of a UE side on reception and a processing time delay of a maximum data packet of <NUM>, after receiving data on a subframe n, UE can perform corresponding sending only at a location of a subframe n + k, where k ≥ <NUM>. Therefore, during one uplink transmission, a round trip time (Round Trip Time, "RTT" for short) required from a time when a base station schedules uplink data, to a time when data is transmitted in downlink, and then to a time when the base station provides a corresponding feedback is not less than <NUM>.

In a TDD system, different subframes are occupied in uplink and downlink. Therefore, an RTT is generally greater than <NUM>. For example, the RTT reaches <NUM> or <NUM> for some TDD configurations. <NUM> is a minimum air interface time delay required for an RTT of single transmission. If a signaling interaction procedure of a service in a transmission process is considered, for example, M interactions are performed, a minimum time delay of <NUM> (ms) exists from a time when the service is initiated to a time when the service formally starts to be transmitted. If M = <NUM>, a time delay of <NUM> is required. This greatly affects user experience and radio network performance.

<CIT> relates to method for transmitting and receiving uplink/downlink data with MTC device.

The present disclosure provides a wireless communication method, a network device, user equipment, and a system, so that a transmission time delay can be shortened, and user experience and radio network performance can be improved.

Based on the foregoing technical features, according to the wireless communication method, the network device, the user equipment, and the system that are provided in the implementations of the present disclosure, the network device sends, to the user equipment, the control information including the first indication information that is used to indicate the time domain resource for the first transmission between the user equipment and the network device. The user equipment may obtain, according to the control information, the time domain resource for communicating with the network device by using the first transmission, and communicate with the network device on the obtained time domain resource. The time of occupying the resource by the one transmission of the first transmission is less than <NUM>. This can reduce a transmission time delay in a communication process, and improve user experience and radio network performance.

It should be understood that the technical solutions of the implementations of the present disclosure may be applied to various communications systems, such as a Global System for Mobile Communications (Global System of Mobile Communication, "GSM" for short) system, a Code Division Multiple Access (Code Division Multiple Access, "CDMA" for short) system, a Wideband Code Division Multiple Access (Wideband Code Division Multiple Access, "WCDMA" for short) system, a Long Term Evolution (Long Term Evolution, "LTE" for short) system, an LTE frequency division duplex (Frequency Division Duplex, "FDD" for short) system, an LTE time division duplex (Time Division Duplex, "TDD" for short), a Universal Mobile Telecommunications System (Universal Mobile Telecommunication System, "UMTS" for short), and a future <NUM> communications system.

It should be understood that, in the implementations of the present disclosure, user equipment may also be referred to as terminal equipment (Terminal Equipment), a mobile station (Mobile Station, "MS" for short), a mobile terminal (Mobile Terminal), or the like. The user equipment may communicate with one or more core networks by using a radio access network (Radio Access Network, "RAN" for short). For example, the user equipment may be a mobile phone (or referred to as a "cellular" phone) or a computer with a mobile terminal. For example, the user equipment may be a portable, pocket-sized, handheld, computer built-in, or in-vehicle mobile apparatus, a terminal device in a future <NUM> network, or a terminal device in a future evolved PLMN network.

It should be further understood that, in the implementations of the present disclosure, a network device may be a device configured to communicate with user equipment. The network device may be a base transceiver station (Base Transceiver Station, "BTS" for short) in a GSM system or a CDMA system, may be a NodeB (NodeB, "NB" for short) in a WCDMA system, or may be an evolved NodeB (Evolutional Node B, "eNB" or "eNodeB" for short) in an LTE system. Alternatively, the network device may be a relay station, an access point, an in-vehicle device, a wearable device, a network-side device in a future <NUM> network, a network device in a future evolved PLMN network, or the like.

<FIG> is a schematic diagram of an application scenario according to an implementation of the present disclosure. As shown in <FIG>, there are multiple user equipments UEs within a scope of a base station eNB. The base station performs wireless communication with the multiple UEs. The eNB may schedule, according to a service requirement, a resource, and a scheduling status, different transmission modes for UE <NUM> and UE <NUM>, to improve transmission performance and efficiency.

It should be noted that a case in which there is only one base station (an isolated base station) is shown in the scenario shown in <FIG>. However, the present disclosure is not limited thereto. The base station may further have an adjacent base station and user equipment that transmit a service on a same time-frequency resource.

It should be noted that a time-frequency resource may be generally a communication resource. For example, the time-frequency resource may be a communication resource having a time dimension and a frequency dimension. A minimum unit of the time-frequency resource is not limited in the implementations of the present disclosure. For example, the minimum unit of the time-frequency resource may be a subframe, a frame, or a timeslot from a time perspective, or may be a subband, an entire operating band, or a subcarrier from a frequency perspective. A time-frequency dimension may be a resource block (Resource Block, "RB" for short), a resource element (Resource Element, "RE"), or the like.

It should be noted that, for ease of description, in the implementations of the present disclosure, transmission in which a time of occupying a transmission resource by one transmission in an existing LTE system is referred to as transmission with a time delay not shortened, and a subframe in which all resources of a <NUM> subframe are used for transmission with a time delay not shortened is referred to as a subframe with a time delay not shortened. In the implementations of the present disclosure, first transmission is relative to the transmission with a time delay not shortened in the LTE system. In the implementations of the present disclosure, a time of occupying a transmission resource by one transmission of the first transmission is less than <NUM>. The first transmission in the implementations of the present disclosure may be referred to as transmission with a shortened time delay (Shorten Time Delay Transmission). One transmission (or referred to as "single transmission") means that a network device or user equipment performs sending or reception once on a resource actually occupied in a <NUM> subframe during the first transmission. A subframe in which all resources of the entire <NUM> subframe are used for transmission with a shortened time delay, or a subframe in which all physical downlink shared channel (Physical Downlink Shared Channel, "PDSCH" for short) resources of the entire <NUM> subframe are used for transmission with a shortened time delay may be referred to as a subframe with a shortened time delay. However, the protection scope of the present disclosure is not limited to the name.

The subframe with a shortened time delay in the implementations of the present disclosure may be all subframes in the existing LTE system. Preferably, a subframe in the implementations of the present disclosure is one or more subframes in a Multicast/Broadcast over Single Frequency Network (Multicast/Broadcast over Single Frequency Network, "MBSFN" for short) subframe set. In a frequency division duplex FDD mode, numbers of subframes included in the MBSFN are <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM>; and in a time division duplex TDD mode, numbers of subframes included in the MBSFN subframe set are <NUM>, <NUM>, <NUM>, <NUM>, and <NUM>. This can ensure that user equipment not performing transmission with a shortened time delay does not send data on a subframe with a shortened time delay.

Two cases are included when the subframe with a shortened time delay in the implementations of the present disclosure is actually used. In a case <NUM>, in a subframe, all resources that are in a frequency domain and that are on another symbol excluding a symbol of a control channel on which a physical downlink control channel (Physical downlink Control Channel, "PDCCH" for short) is located are used for transmission with a shortened time delay. In a case <NUM>, in a subframe, a part of a subband or bandwidth that is in a frequency domain and that is on another symbol excluding a symbol of a control channel on which a PDCCH is located is used for transmission with a shortened time delay. In the case <NUM>, the subframe may be referred to as a dedicated subframe with a shortened time delay. In the case <NUM>, the subframe may be referred to as a subframe with a subband whose time delay is shortened. During the transmission in the implementations of the present disclosure, a type of the so-called subframe with a shortened time delay may be any one of the foregoing subframes or a combination of the foregoing two subframes (that is, in configured subframes, some subframes are dedicated subframes with a shortened time delay, and some are subframes with a subband whose time delay is shortened).

<FIG> is a schematic flowchart of a wireless communication method according to an implementation of the present disclosure. The method may be executed by a network device. As shown in <FIG>, the method <NUM> includes the following steps:.

Specifically, the network device generates the control information including the first indication information that is used to indicate the time domain resource for the first transmission between the user equipment and the network device, and sends the control information to the user equipment. The duration of occupying the resource by the one transmission of the first transmission is less than <NUM>.

Therefore, according to the wireless communication method in this implementation of the present disclosure, the network device sends, to the user equipment, the control information including the first indication information that is used to indicate the time domain resource for the first transmission between the user equipment and the network device. The user equipment may obtain, according to the control information, the time domain resource for communicating with the network device by using the first transmission, and communicate with the network device on the obtained time domain resource. The time of occupying the resource by the one transmission of the first transmission is less than <NUM>. This can reduce a transmission time delay in a communication process, and improve user experience.

Optionally, in S1100, the control information further includes at least one of the following information: identification information used to indicate a process number of an automatic repeat request HARQ corresponding to the first transmission, or second indication information used to indicate a retransmission redundancy version corresponding to the first transmission.

Optionally, in S1100, the control information carries a radio network temporary identity (Radio Network Tempory Identity, "RNTI" for short) related to the first transmission. The user equipment may determine, according to the radio network temporary identity RNTI related to the first transmission, that the time domain resource indicated by the control information is a resource used for the first transmission.

Optionally, S1200 is specifically: sending physical downlink control channel PDCCH information to the user equipment by using the first M time domain symbols in a first subframe, where the PDCCH information includes the control information, M is a positive integer, and other time domain symbols, excluding the first M time domain symbols, in time domain symbols included in the first subframe are allocated to multiple user equipments.

That is, as shown in <FIG>, the network device may add the control information onto a PDCCH channel. In each <NUM> subframe, a symbol occupied by PDCCH signaling that carries the control information is included, and remaining symbols are allocated to at least two user equipments UEs to perform transmission with a shortened time delay. For example, in <FIG>, a part filled with slashes may be allocated to UE <NUM>, a part filled with vertical lines may be allocated to UE <NUM>, and a part filled with dots may be allocated to UE <NUM>. However, the present disclosure is not limited thereto.

In the prior art, when allocating a time domain resource, a network device allocates all non-PDCCH symbols in an entire <NUM> subframe to user equipment, and a resource occupation time in a time domain is too long. As a result, when receiving data, the user equipment needs to spend a corresponding time of <NUM> on completing data reception, thereby affecting a processing time of the user equipment. In this implementation of the present disclosure, all non-PDCCH symbols in a subframe may be allocated to multiple user equipments, and the multiple user equipments may occupy all of system bandwidth of allocated symbols or occupy a part of entire system bandwidth (a subcarrier or a subband). This reduces a time of receiving data by user equipment and increases a processing speed of the user equipment.

Optionally, S1200 is specifically: sending a physical downlink shared channel PDSCH to the user equipment by using N time domain symbols in a second subframe, where the first K time domain symbols of the N time domain symbols carry the control information, and N and K are positive integers.

That is, as shown in <FIG>, the control information may occupy all or a part of bandwidth of some symbols, excluding a PDCCH symbol, in a PDSCH area in a <NUM> subframe. To reduce complexity when the user equipment performs detection, a symbol occupied by the control information and a location, in a frequency domain, of a subband occupied by the control information are predefined, or are indicated by the network device to the user equipment by using signaling. This is not limited in the present disclosure.

Optionally, in S1100, the first indication information indicates time domain symbols that are in the first subframe and that are occupied by the time domain resource, and the time domain symbols indicated by the first indication information do not include the time domain symbols occupied by the PDCCH information.

For example, the symbols occupied by the PDCCH information are generally the first <NUM> to <NUM> downlink symbols in a subframe. Therefore, assuming that a quantity of symbols actually occupied by the PDCCH information is LDCI, locations of symbols occupied by different UEs are indicated by symbols excluding the LDCI symbols. For example, if a subframe has a total of L downlink OFDM symbols (in an LTE system, L = <NUM> for a normal (normal) subframe, and L = <NUM> for an extended (extended) subframe), a location indicating a shortened time delay is indicated in L - LDCI symbols. A bit mapping manner may be used for indication. For example, LDCI occupies three symbols (that is, occupies a total of three OFDM symbols: a symbol <NUM>, a symbol <NUM>, and a symbol <NUM>). Assuming that a total of three different user equipments with a shortened time delay are supported in the subframe and the three UEs are numbered UE <NUM> to UE <NUM> respectively, indication signaling for the three UEs in the subframe is as follows:.

Optionally, in S4100, the first indication information indicates time domain symbols that are in the second subframe and that are occupied by the time domain resource, and the time domain symbols indicated by the first indication information does not include numbers of time domain symbols occupied by a PDCCH or the first K time domain symbols.

That is, signaling that indicates, for different UEs, transmission with a shortened time delay is indicated at a location obtained after a downlink OFDM symbol occupied for transmission with a shortened time delay is further excluded, that is, is indicated on L - LDCI - LsDCI. LDCI is a quantity of symbols used for transmitting downlink control information (Downlink Control Information, "DCI" for short) in the prior art. That is, a location indicating a resource for transmission with a shortened time delay is determined according to the quantity of symbols occupied by the DCI and/or a quantity of time domain symbols occupied by the control information.

Optionally, in S <NUM>, the first indication information indicates a time domain symbol set corresponding to time domain symbols that are in a subframe and that are occupied by the time domain resource.

Specifically, a solution of dividing a subframe with a shortened time delay in uplink and downlink may be notified in advance by using signaling or may be predefined. Then the first indication information in the control information is used to indicate which part the time domain resource belongs to. For example, for uplink, symbols used for transmission on an uplink traffic channel may be predefined or may be notified by using signaling. For example, symbols in a subframe may be divided according to a division method shown in Table <NUM> or Table <NUM>. The first indication information may directly indicate a number of a set corresponding to a symbol. A set division method is not limited in the present disclosure.

To sum up, all or some of L symbols may be divided into K parts, and then such division is predefined or is notified by using signaling. Then the first indication information only needs to indicate, by using smaller signaling, a part to which a resource, for transmission with a shortened time delay, of current UE belongs. In this way, signaling can be saved.

For downlink, when division is indicated by using signaling or is being predefined, a symbol occupied by the DCI and/or a symbol that may be occupied by the control information needs to be excluded, and then division of remaining symbols is indicated by using signaling or is predefined.

In this implementation of the present disclosure, optionally, the network device may implicitly indicate a resource location that is occupied by a resource, for transmission with a shortened time delay, of each UE and that is in a downlink subframe and/or an uplink subframe. For example, a location in a time domain and/or a frequency domain may be used to indicate a location, in a subframe, of receiving and/or sending data with a shortened time delay by corresponding receiving UE. For example, frequency domain bandwidth is divided into three parts, and if the control information is at a frequency band i, corresponding data reception/sending with a shortened time delay is in the ith part. In addition, optionally, only a quantity of occupied symbols needs to be indicated in the control information. If time domain division that is based on a shortened time delay and that can be supported in a subframe is defined or is notified by using higher layer signaling, the quantity of occupied symbols does not need to be indicated.

The foregoing describes in detail the wireless communication method in the implementation of the present disclosure from a network device side with reference to <FIG>. The following describes in detail a wireless communication method in another implementation of the present disclosure from a user equipment side with reference to <FIG>. It should be understood that interaction between user equipment and a network device, related characteristics and functions, and the like that are described from the network device side are corresponding to descriptions from the user equipment side. For brevity, repeated descriptions are properly omitted.

<FIG> is a schematic flowchart of a wireless communication method according to another implementation of the present disclosure. The method may be executed by user equipment. As shown in <FIG>, the method <NUM> includes the following steps:.

Specifically, the user equipment receives the control information sent by the network device, and communicates with the network device according to the control information. The control information includes the first indication information used to indicate the time domain resource for the first transmission between the user equipment and the network device. Therefore, the user equipment may receive, according to the control information, downlink data that is sent by the network device by using the first transmission, and the user equipment may also send, according to the control information, uplink data to the network device by using the first transmission. The duration of occupying the resource by the one transmission of the first transmission is less than <NUM>.

Therefore, according to the wireless communication method in this implementation of the present disclosure, the user equipment receives the control information sent by the network device. The control information includes the first indication information used to indicate the time domain resource for the first transmission between the user equipment and the network device. Therefore, the user equipment may communicate with the network device by using the first transmission. This can reduce a transmission time delay in a communication process, and improve user experience.

Optionally, in S2100, the control information carries a radio network temporary identity RNTI related to the first transmission.

Optionally, S2100 is specifically: receiving, on the first M time domain symbols in a first subframe, physical downlink control channel PDCCH information sent by the network device, where the PDCCH information includes the control information, M is a positive integer, and other time domain symbols, excluding the first M time domain symbols, in time domain symbols included in the first subframe are allocated to multiple user equipments.

Optionally, S2100 is specifically: receiving, on N time domain symbols in a second subframe, a physical downlink shared channel PDSCH sent by the network device, where the first K time domain symbols of the N time domain symbols carry the control information, and N and K are positive integers.

Optionally, in S2100, the first indication information indicates time domain symbols that are in the first subframe and that are occupied by the time domain resource, and the time domain symbols indicated by the first indication information do not include the time domain symbols occupied by the PDCCH information.

Optionally, in S2100, the first indication information indicates time domain symbols that are in the second subframe and that are occupied by the time domain resource, and the time domain symbols indicated by the first indication information do not include time domain symbols occupied by a PDCCH or the first K time domain symbols.

Optionally, in S2100, the first indication information indicates a time domain symbol set corresponding to time domain symbols that are in a subframe and that are occupied by the time domain resource.

Optionally, in S2100, the control information further includes at least one of the following information: identification information used to indicate a process number of an automatic repeat request HARQ corresponding to the first transmission, or second indication information used to indicate a retransmission redundancy version corresponding to the first transmission.

The following describes in detail a wireless communication method in still another implementation of the present disclosure with reference to <FIG>. The method may be executed by a network device. As shown in <FIG>, the method <NUM> includes the following steps:.

Specifically, after sending the uplink transmission resource indication information to the user equipment, the network device receives the data packets that are sent by the user equipment on the at least two independent sub transmission resources included in the uplink transmission resource that is determined according to the uplink transmission resource indication information. The granularity, in the time domain, of each independent sub transmission resource is the preset symbol quantity.

Therefore, according to the wireless communication method in this implementation of the present disclosure, the network device sends the uplink transmission resource indication information to the user equipment, and receives the data packets that are sent by the user equipment on the at least two independent sub transmission resources included in the uplink transmission resource that is determined according to the uplink transmission resource indication information. This can resolve a resource use problem when uplink coverage of user equipment supporting transmission with a shortened time delay is limited, and does not greatly increase a transmission time delay.

Optionally, in a transmission time interval (Transmission Time Interval, "TTI" for short) binding technology in the prior art, a granularity of each independent sub transmission resource is a subframe. In comparison, in the present disclosure, the granularity, in the time domain, of each independent sub transmission resource may be one symbol, two symbols, three symbols, four symbols, or the like. Therefore, according to the method in this implementation of the present disclosure, a resource allocation manner is more flexible, and a processing time delay is shorter, thereby reducing a transmission time delay and improving user experience and network performance.

It should be understood that the method in this implementation of the present disclosure may also be applied to downlink transmission. In this case, a network device sends, to user equipment, downlink transmission resource indication information indicating a downlink transmission resource of the user equipment; the user equipment determines, according to the downlink transmission resource indication information, a transmission resource for receiving downlink data, where the transmission resource for receiving downlink data includes at least two independent sub transmission resources, and a granularity, in a time domain, of the at least independent sub transmission resources is a preset symbol quantity; the user equipment receives downlink data that is sent by the network device by using each independent sub transmission resource; and after receiving all downlink data sent by the network device, the user equipment sends feedback information to the network device.

It should be understood that, in S3200, the data packets sent on the at least two independent sub transmission resources may be different retransmission RVs of a same data packet (corresponding to IR (Incremental Redundancy incremental redundancy, "IR" for short) retransmission in an existing LTE protocol), or may be same copies of a same data packet (that is, content sent in each retransmitted packet is completely the same, corresponding to CC (Chase Combining chase combining, "CC" for short) retransmission in an existing LTE protocol). In this implementation of the present disclosure, optionally, a time, in the time domain, of occupying the uplink transmission resource is greater than <NUM>. In this case, the at least two independent sub transmission resources may be distributed in multiple consecutive subframes.

Optionally, in S3100, the uplink resource indication information includes at least one of the following information: allocation type information of the at least two independent sub transmission resources, subframe number information corresponding to each of the at least two independent sub transmission resources, or a time domain symbol and frequency domain location information that are in a subframe and that are corresponding to each of the at least two independent sub transmission resources. The allocation type information herein indicates continuous resource allocation or discontinuous resource allocation. The continuous resource allocation means that all non-PDCCH resources of multiple consecutive subframes, excluding a resource occupied by a PDCCH, are allocated, until all to-be-transmitted data and retransmission RVs of the data are completely transmitted. <FIG> is an implementation of continuous resource allocation. For to-be-transmitted data, some non-PDCCH resources of the first subframe are first allocated, and then a resource with a shortened time delay in a next subframe is occupied. The discontinuous resource allocation means that some non-PDCCH resources of multiple consecutive subframes, excluding a resource occupied by a PDCCH, are allocated, until all to-be-transmitted data and retransmission RVs of the data are completely transmitted. <FIG> is an implementation of discontinuous resource allocation. To-be-transmitted data occupies only some non-PDCCH resources each time, and three subframes are continuously occupied.

Optionally, in S3100, the uplink transmission resource indication information indicates that the uplink transmission resource is all or a part of a remaining resource, excluding a resource occupied by a physical downlink control channel PDCCH, in a first subframe.

For example, as shown in <FIG>, the network device may allocate, as a binding, multiple resources with a shortened time delay, excluding control signaling DCI, in a subframe to UE with a shortened uplink time delay to use. Likewise, a version number of an RV used for retransmission may be predefined, for example, [<NUM>, <NUM>, <NUM>, <NUM>]. If a time domain resource for retransmission exceeds four times, a predefined template may be used for repetition. If a quantity of retransmission times is <NUM>, RV versions corresponding to the <NUM> times are [<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>]. A subsequent feedback is a feedback for one bound transmission.

Further, when a time domain transmission resource that needs to be bound is less than a maximum resource provided in a <NUM> subframe, only a part of the time domain transmission resource may be used. As shown in <FIG>, only two resources for transmission with a shortened time delay are used. The remaining one resource may be allocated to UE <NUM> for transmission with a shortened time delay.

Optionally, in S3100, the uplink transmission resource indication information indicates that the uplink transmission resource includes a part of a remaining resource, excluding a resource occupied by a PDCCH, in each subframe of M consecutive subframes, where M is an integer greater than or equal to <NUM>.

Alternatively, the uplink transmission resource indication information indicates that the uplink transmission resource includes a remaining resource, excluding a resource occupied by a PDCCH, in each subframe of the first K subframes of N consecutive subframes, and a part of a remaining resource, excluding a resource occupied by the PDCCH, in each subframe of the last N - K subframes of the N consecutive subframes, where N and K are integers greater than or equal to <NUM>. For example, in <FIG>, a value of N is <NUM>, and a value of K is <NUM>. It should be noted that the value of N is a subframe quantity corresponding to a total quantity of time domain symbols occupied for initially transmitting a data packet and retransmitting the data packet.

For example, when a time domain transmission resource that needs to be bound is greater than a maximum resource provided in a <NUM> subframe, a resource provided in more than one subframe of multiple consecutive subframes may be allocated to UE to use. As shown in <FIG>, all three resources, in the first subframe, for transmission with a shortened time delay, and one resource, in a next adjacent subframe (a subframe that may be used for transmission with a shortened time delay), for transmission with a shortened time delay are used.

Therefore, according to the wireless communication method in this implementation of the present disclosure, in the foregoing method for continuously allocating at least two independent time-frequency resources with a shortened time delay to UE with a shortened uplink time delay to use, resource allocation is more flexible, and resource use of UE with limited coverage can be preferably ensured. In addition, compared with a prior-art resource allocation manner, this method is more flexible and has a shorter processing time delay.

Further, a resource binding method for transmission with a shortened time delay may be distributed. As shown in <FIG>, resources may be allocated to multiple consecutive available subframes with a shortened time delay. For example, one available resource is allocated to a subframe <NUM>, the second resource is allocated to a subframe <NUM>, and the third resource is allocated to a subframe <NUM>. Further, quantities of resources allocated to subframes may be the same or may be different, and there may be one or more resources.

Therefore, according to the wireless communication method in this implementation of the present disclosure, an uplink sending time delay of UE on which bound transmission needs to be performed together with a subframe with a shortened time delay is properly increased, but impact on sending of another UE with a shortened time delay is reduced because not all resources, in one subframe, for transmission with a shortened time delay are occupied, so that impact on a HARQ process of the another UE with a shortened time delay is reduced.

The foregoing describes in detail the wireless communication method in the still another implementation of the present disclosure from a network device side with reference to <FIG>. The following describes in detail a wireless communication method in still another implementation of the present disclosure from a user equipment side with reference to <FIG>. It should be understood that interaction between user equipment and a network device, related characteristics and functions, and the like that are described from the network device side are corresponding to descriptions from the user equipment side. For brevity, repeated descriptions are properly omitted.

<FIG> shows a wireless communication method according to still another implementation of the present disclosure. The method may be executed by user equipment. As shown in <FIG>, the method <NUM> includes the following steps:.

Specifically, after receiving the uplink transmission resource indication information sent by the network device, the user equipment sends the data packets to the network device on the at least two independent sub transmission resources included in the uplink transmission resource that is determined according to the uplink transmission resource indication information. The granularity, in the time domain, of each independent sub transmission resource is the preset symbol quantity.

Therefore, according to the wireless communication method in this implementation of the present disclosure, the user equipment receives the uplink transmission resource indication information sent by the network device, and sends the data packets to the network device on the at least two independent sub transmission resources included in the uplink transmission resource that is determined according to the uplink transmission resource indication information. This can resolve a resource use problem when uplink coverage of user equipment supporting transmission with a shortened time delay is limited, and does not greatly increase a transmission time delay.

Optionally, in S4100, the uplink resource indication information includes at least one of the following information: allocation type information of the at least two independent sub transmission resources, subframe number information corresponding to each of the at least two independent sub transmission resources, or a time domain symbol and frequency domain location information that are in a subframe and that are corresponding to each of the at least two independent sub transmission resources.

Optionally, in S4100, the uplink transmission resource indication information indicates that the uplink transmission resource is all or a part of a remaining resource, excluding a resource occupied by a physical downlink control channel PDCCH, in a first subframe.

Optionally, in S4100, the uplink transmission resource indication information indicates that the uplink transmission resource includes a part of a remaining resource, excluding a resource occupied by a PDCCH, in each subframe of M consecutive subframes, where M is an integer greater than or equal to <NUM>.

Alternatively, the uplink transmission resource indication information indicates that the uplink transmission resource includes a remaining resource, excluding a resource occupied by a PDCCH, in each subframe of the first K subframes of N consecutive subframes, and a part of a remaining resource, excluding a resource occupied by the PDCCH, in each subframe of the last N - K subframes of the N consecutive subframes, where N and K are integers greater than or equal to <NUM>. It should be noted that a value of N is a subframe quantity corresponding to a total quantity of time domain symbols occupied for initially transmitting a data packet and retransmitting the data packet.

Optionally, in S4300, quantities of symbols occupied, in the time domain, by the at least two independent sub transmission resources may be <NUM>, <NUM>, or the like. This is not limited in the present disclosure. In addition, symbols occupied by each independent sub resource may be consecutive symbols in a same subframe, may be non-consecutive symbols in a same subframe, or may be symbols in different subframes. This is not limited in the present disclosure.

The following specifically describes a network device in an implementation of the present disclosure with reference to <FIG>. As shown in <FIG>, the network device <NUM> includes:.

Therefore, the network device according to this implementation of the present disclosure sends, to the user equipment, the control information including the first indication information that is used to indicate the time domain resource for the first transmission between the user equipment and the network device. The user equipment may obtain, according to the control information, the time domain resource for communicating with the network device by using the first transmission, and communicate with the network device on the obtained time domain resource. The time of occupying the resource by the one transmission of the first transmission is less than <NUM>. This can reduce a transmission time delay in a communication process, and improve user experience.

It should be understood that, in this implementation of the present disclosure, a sending action performed by the sending module <NUM> may be performed by a transceiver module that has a sending function.

In this implementation of the present disclosure, optionally, the control information carries a radio network temporary identity RNTI related to the first transmission.

In this implementation of the present disclosure, optionally, that the sending module <NUM> sends the control information to the user equipment includes: sending physical downlink control channel PDCCH information to the user equipment by using the first M time domain symbols in a first subframe, where the PDCCH information includes the control information, M is a positive integer, and other time domain symbols, excluding the first M time domain symbols, in time domain symbols included in the first subframe are allocated to multiple user equipment.

In this implementation of the present disclosure, optionally, that the sending module <NUM> sends the control information to the user equipment includes: sending a physical downlink shared channel PDSCH to the user equipment by using N time domain symbols in a second subframe, where the first K time domain symbols of the N time domain symbols carry the control information, and N and K are positive integers.

In this implementation of the present disclosure, optionally, the first indication information indicates time domain symbols that are in the first subframe and that are occupied by the time domain resource, and the time domain symbols indicated by the first indication information do not include the time domain symbols occupied by the PDCCH information.

In this implementation of the present disclosure, optionally, the first indication information indicates time domain symbols that are in the second subframe and that are occupied by the time domain resource, and the time domain symbols indicated by the first indication information do not include time domain symbols occupied by a PDCCH or the first K time domain symbols.

In this implementation of the present disclosure, optionally, the first indication information indicates a time domain symbol set corresponding to time domain symbols that are in a subframe and that are occupied by the time domain resource.

In this implementation of the present disclosure, optionally, the control information further includes at least one of the following information: identification information used to indicate a process number of an automatic repeat request HARQ corresponding to the first transmission, or second indication information used to indicate a retransmission redundancy version corresponding to the first transmission.

It should be understood that the network device <NUM> according to this implementation of the present disclosure may correspondingly execute the wireless communication method <NUM> in the implementations of the present disclosure. In addition, the foregoing and other operations and/or functions of the modules in the network device <NUM> aim to implement the corresponding process in <FIG>. For brevity, details are not described herein again.

The following describes in detail user equipment in an implementation of the present disclosure with reference to <FIG>. As shown in <FIG>, the user equipment <NUM> includes:.

Therefore, the user equipment according to this implementation of the present disclosure receives the control information sent by the network device. The control information includes the first indication information used to indicate the time domain resource for the first transmission between the user equipment and the network device. Therefore, the user equipment may communicate with the network device by using the first transmission. This can reduce a transmission time delay in a communication process, and improve user experience.

It should be understood that, in this implementation of the present disclosure, a receiving action performed by the transceiver module <NUM> may be performed by a receiving module that has a receiving function, and a sending action performed by the transceiver module <NUM> may be performed by a sending module that has a sending function.

In this implementation of the present disclosure, optionally, that the receiving module <NUM> receives the control information sent by the network device includes: receiving, on the first M time domain symbols in a first subframe, physical downlink control channel PDCCH information sent by the network device, where the PDCCH information includes the control information, M is a positive integer, and other time domain symbols, excluding the first M time domain symbols, in time domain symbols included in the first subframe are allocated to multiple user equipment.

In this implementation of the present disclosure, optionally, that the receiving module <NUM> receives the control information sent by the network device includes: receiving, on N time domain symbols in a second subframe, a physical downlink shared channel PDSCH sent by the network device, where the first K time domain symbols of the N time domain symbols carry the control information, and N and K are positive integers.

It should be understood that the user equipment <NUM> according to this implementation of the present disclosure may correspondingly execute the wireless communication method <NUM> in the implementations of the present disclosure. In addition, the foregoing and other operations and/or functions of the modules in the user equipment <NUM> aim to implement the corresponding process in <FIG>. For brevity, details are not described herein again.

The following describes in detail a network device in another implementation of the present disclosure with reference to <FIG>. As shown in <FIG>, the network device <NUM> includes:.

Therefore, the network device in this implementation of the present disclosure sends the uplink transmission resource indication information to the user equipment, and receives the data packets that are sent by the user equipment on the at least two independent sub transmission resources included in the uplink transmission resource that is determined according to the uplink transmission resource indication information. This can resolve a resource use problem when uplink coverage of user equipment supporting transmission with a shortened time delay is limited, and does not greatly increase a transmission time delay.

It should be understood that, in this implementation of the present disclosure, a sending action performed by the sending module <NUM> and a receiving action performed by the receiving module <NUM> may be performed by a transceiver module that has receiving and sending functions.

In this implementation of the present disclosure, optionally, the uplink resource indication information includes at least one of the following information: allocation type information of the at least two independent sub transmission resources, subframe number information corresponding to each of the at least two independent sub transmission resources, or a time domain symbol and frequency domain location information that are in a subframe and that are corresponding to each of the at least two independent sub transmission resources.

In this implementation of the present disclosure, optionally, the uplink transmission resource indication information indicates that the uplink transmission resource is all or a part of a remaining resource, excluding a resource occupied by a physical downlink control channel PDCCH, in a first subframe.

In this implementation of the present disclosure, optionally, the uplink transmission resource indication information indicates that the uplink transmission resource includes a part of a remaining resource, excluding a resource occupied by a PDCCH, in each subframe of M consecutive subframes, where M is an integer greater than or equal to <NUM>; or
the uplink transmission resource indication information indicates that the uplink transmission resource includes a remaining resource, excluding a resource occupied by a PDCCH, in each subframe of the first K subframes of N consecutive subframes, and a part of a remaining resource, excluding a resource occupied by the PDCCH, in each subframe of the last N - K subframes of the N consecutive subframes, where N and K are integers greater than or equal to <NUM>.

The following describes in detail user equipment in another implementation of the present disclosure with reference to <FIG>. As shown in <FIG>, the user equipment <NUM> includes:.

The transceiver module <NUM> is further configured to send data packets to the network device on the at least two independent sub transmission resources.

Therefore, the user equipment in this implementation of the present disclosure receives the uplink transmission resource indication information sent by the network device, and sends the data packets to the network device on the at least two independent sub transmission resources included in the uplink transmission resource that is determined according to the uplink transmission resource indication information. This can resolve a resource use problem when uplink coverage of user equipment supporting transmission with a shortened time delay is limited, and does not greatly increase a transmission time delay.

An implementation of the present disclosure further provides a wireless communications system, including the network device <NUM> shown in <FIG> and the user equipment <NUM> shown in <FIG>. The network device <NUM> may correspondingly execute the wireless communication method <NUM> in the implementations of the present disclosure, and the foregoing and other operations and/or functions of modules in the network device <NUM> aim to implement the corresponding process in <FIG>. The user equipment <NUM> may correspondingly execute the wireless communication method <NUM> in the implementations of the present disclosure, and the foregoing and other operations and/or functions of modules in the user equipment <NUM> aim to implement the corresponding process in <FIG>. For brevity, details are not described herein again.

The present disclosure further provides a wireless communications system, including the network device <NUM> shown in <FIG> and the user equipment <NUM> shown in <FIG>. The network device <NUM> may correspondingly execute the wireless communication method <NUM> in the implementations of the present disclosure, and the foregoing and other operations and/or functions of modules in the network device <NUM> aim to implement the corresponding process in <FIG>. The user equipment <NUM> may correspondingly execute the wireless communication method <NUM> in the implementations of the present disclosure, and the foregoing and other operations and/or functions of modules in the user equipment <NUM> aim to implement the corresponding process in <FIG>. For brevity, details are not described herein again.

As shown in <FIG>, an implementation of the present disclosure further provides a network device <NUM>. The network device <NUM> includes a processor <NUM>, a memory <NUM>, a receiver <NUM>, a transmitter <NUM>, and a bus system <NUM>. The bus system <NUM> is optional. The processor <NUM>, the memory <NUM>, the receiver <NUM>, and the transmitter <NUM> may be connected by using the bus system <NUM>. The memory <NUM> is configured to store an instruction. The processor <NUM> is configured to execute the instruction stored in the memory <NUM>, to control the receiver <NUM> to receive a signal and control the transmitter <NUM> to send a signal. The processor <NUM> is configured to generate control information, where the control information includes first indication information used to indicate a time domain resource for first transmission between user equipment and the network device, and duration of occupying a resource by one transmission of the first transmission is less than <NUM> millisecond. The transmitter <NUM> is configured to send the control information to the user equipment.

It should be understood that, in this implementation of the present disclosure, the processor <NUM> may be a central processing unit (Central Processing Unit, "CPU" for short), or may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or another programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the like. The general-purpose processor may be a microprocessor, or the processor may be any conventional processor or the like.

The memory <NUM> may include a read-only memory and a random access memory, and provide an instruction and data for the processor <NUM>. A part of the memory <NUM> may further include a non-volatile random access memory. For example, the memory <NUM> may further store device type information.

In addition to a data bus, the bus system <NUM> may further include a power bus, a control bus, a status signal bus, and the like. However, for clarity of description, all buses are expressed as the bus system <NUM> in the figure.

In an implementation process, the steps in the foregoing method may be performed by using an integrated logic circuit of hardware in the processor <NUM> or an instruction in a form of software. The steps of the method disclosed with reference to the implementations of the present disclosure may be directly performed by a hardware processor, or may be performed by hardware in the processor and a software module. The software module may be located in a mature storage medium in the art, such as a random memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, or a register. The storage medium is located in the memory <NUM>. The processor <NUM> reads information from the memory <NUM> and performs the steps of the foregoing method by using the hardware of the processor <NUM>. To avoid repetition, details are not described herein again.

Optionally, in an implementation, the control information carries a radio network temporary identity RNTI related to the first transmission.

Optionally, in an implementation, that the transmitter <NUM> sends the control information to the user equipment includes: sending physical downlink control channel PDCCH information to the user equipment by using the first M time domain symbols in a first subframe, where the PDCCH information includes the control information, M is a positive integer, and other time domain symbols, excluding the first M time domain symbols, in time domain symbols included in the first subframe are allocated to multiple user equipments.

Optionally, in an implementation, that the transmitter <NUM> sends the control information to the user equipment includes: sending a physical downlink shared channel PDSCH to the user equipment by using N time domain symbols in a second subframe, where the first K time domain symbols of the N time domain symbols carry the control information, and N and K are positive integers.

Optionally, in an implementation, the first indication information indicates time domain symbols that are in the first subframe and that are occupied by the time domain resource, and the time domain symbols indicated by the first indication information do not include the time domain symbols occupied by the PDCCH information.

Optionally, in an implementation, the first indication information indicates time domain symbols that are in the second subframe and that are occupied by the time domain resource, and the time domain symbols indicated by the first indication information do not include time domain symbols occupied by a PDCCH or the first K time domain symbols.

Optionally, in an implementation, the first indication information indicates a time domain symbol set corresponding to time domain symbols that are in a subframe and that are occupied by the time domain resource.

Optionally, in an implementation, the control information further includes at least one of the following information: identification information used to indicate a process number of an automatic repeat request HARQ corresponding to the first transmission, or second indication information used to indicate a retransmission redundancy version corresponding to the first transmission.

It should be understood that the network device <NUM> according to this implementation of the present disclosure may be corresponding to the network device <NUM> in the implementation of the present disclosure, and may be corresponding to a corresponding body which performs the method in the implementations of the present disclosure. In addition, the foregoing and other operations and/or functions of the modules in the network device <NUM> aim to implement the corresponding process of each method in <FIG>. For brevity, details are not described herein again.

As shown in <FIG>, an implementation of the present disclosure further provides user equipment <NUM>. The user equipment <NUM> includes a processor <NUM>, a memory <NUM>, a receiver <NUM>, a transmitter <NUM>, and a bus system <NUM>. The bus system <NUM> is optional. The processor <NUM>, the memory <NUM>, the receiver <NUM>, and the transmitter <NUM> may be connected by using the bus system <NUM>. The memory <NUM> is configured to store an instruction. The processor <NUM> is configured to execute the instruction stored in the memory <NUM>, to control the receiver <NUM> to receive a signal and control the transmitter <NUM> to send a signal. The receiver <NUM> is configured to receive control information sent by a network device, where the control information includes first indication information used to indicate a time domain resource for first transmission between the user equipment and the network device, and duration of occupying a resource by one transmission of the first transmission is less than <NUM> millisecond. The processor <NUM> is configured to control the receiver <NUM> and the transmitter <NUM> to communicate with the network device according to the control information.

Optionally, in an implementation, that the receiver <NUM> receives the control information sent by the network device includes: receiving, on the first M time domain symbols in a first subframe, physical downlink control channel PDCCH information sent by the network device, where the PDCCH information includes the control information, M is a positive integer, and other time domain symbols, excluding the first M time domain symbols, in time domain symbols included in the first subframe are allocated to multiple user equipments.

Optionally, in an implementation, that the receiver <NUM> receives the control information sent by the network device includes: receiving, on N time domain symbols in a second subframe, a physical downlink shared channel PDSCH sent by the network device, where the first K time domain symbols of the N time domain symbols carry the control information, and N and K are positive integers.

It should be understood that the user equipment <NUM> according to this implementation of the present disclosure may be corresponding to the user equipment <NUM> in the implementation of the present disclosure, and may be corresponding to a corresponding body of the method in the implementations of the present disclosure. In addition, the foregoing and other operations and/or functions of the modules in the user equipment <NUM> aim to implement the corresponding process of the method in <FIG>. For brevity, details are not described herein again.

As shown in <FIG>, an implementation of the present disclosure further provides a network device <NUM>. The network device <NUM> includes a processor <NUM>, a memory <NUM>, a receiver <NUM>, a transmitter <NUM>, and a bus system <NUM>. The bus system <NUM> is optional. The processor <NUM>, the memory <NUM>, the receiver <NUM>, and the transmitter <NUM> may be connected by using the bus system <NUM>. The memory <NUM> is configured to store an instruction. The processor <NUM> is configured to execute the instruction stored in the memory <NUM>, to control the receiver <NUM> to receive a signal and control the transmitter <NUM> to send a signal. The transmitter <NUM> is configured to send uplink transmission resource indication information to user equipment. The receiver <NUM> is configured to receive data packets that are sent by the user equipment on at least two independent sub transmission resources included in an uplink transmission resource, where the uplink transmission resource is determined by the user equipment according to the uplink transmission resource indication information, and a granularity, in a time domain, of each of the at least two independent sub transmission resources is a preset symbol quantity.

Optionally, in an implementation, the uplink resource indication information includes at least one of the following information: allocation type information of the at least two independent sub transmission resources, subframe number information corresponding to each of the at least two independent sub transmission resources, or a time domain symbol and frequency domain location information that are in a subframe and that are corresponding to each of the at least two independent sub transmission resources.

Optionally, in an implementation, the uplink transmission resource indication information indicates that the uplink transmission resource is all or a part of a remaining resource, excluding a resource occupied by a physical downlink control channel PDCCH, in a first subframe.

Optionally, in an implementation, the uplink transmission resource indication information indicates that the uplink transmission resource includes a part of a remaining resource, excluding a resource occupied by a PDCCH, in each subframe of M consecutive subframes, where M is an integer greater than or equal to <NUM>; or
the uplink transmission resource indication information indicates that the uplink transmission resource includes a remaining resource, excluding a resource occupied by a PDCCH, in each subframe of the first K subframes of N consecutive subframes, and a part of a remaining resource, excluding a resource occupied by the PDCCH, in each subframe of the last N - K subframes of the N consecutive subframes, where N and K are integers greater than or equal to <NUM>.

It should be understood that the network device <NUM> according to this implementation of the present disclosure may be corresponding to the network device <NUM> in the implementation of the present disclosure, and may be corresponding to a corresponding body of the method in the implementations of the present disclosure. In addition, the foregoing and other operations and/or functions of the modules in the network device <NUM> aim to implement the corresponding process of the method in <FIG>. For brevity, details are not described herein again.

As shown in <FIG>, an implementation of the present disclosure further provides user equipment <NUM>. The user equipment <NUM> includes a processor <NUM>, a memory <NUM>, a receiver <NUM>, a transmitter <NUM>, and a bus system <NUM>. The bus system <NUM> is optional. The processor <NUM>, the memory <NUM>, the receiver <NUM>, and the transmitter <NUM> may be connected by using the bus system <NUM>. The memory <NUM> is configured to store an instruction. The processor <NUM> is configured to execute the instruction stored in the memory <NUM>, to control the receiver <NUM> to receive a signal and control the transmitter <NUM> to send a signal. The receiver <NUM> is configured to receive uplink transmission resource indication information sent by a network device. The processor <NUM> is configured to determine an uplink transmission resource according to the uplink transmission resource indication information, where the uplink transmission resource includes at least two independent sub transmission resources, and a granularity, in a time domain, of each of the at least two independent sub transmission resources is a preset symbol quantity. The transmitter <NUM> is configured to send data packets to the network device on the at least two independent sub transmission resources.

It should be understood that "an implementation" or "an implementation" mentioned in the whole specification means that particular features, structures, or characteristics related to the implementation are included in at least one implementation of the present disclosure. Therefore, "in an implementation" or "in an implementation" appearing throughout the specification does not necessarily mean a same implementation. In addition, these particular features, structures, or characteristics may be combined in one or more implementations by using any appropriate manner.

It should be understood that sequence numbers of the foregoing processes do not mean execution sequences in the implementations of the present disclosure. The execution sequences of the processes should be determined according to functions and internal logic of the processes, and should not be construed as any limitation on the implementation processes of the implementations of the present disclosure.

In addition, the terms "system" and "network" may be used interchangeably in this specification. It should be understood that the term "and/or" in this specification describes only an association relationship for describing associated objects and indicates that three relationships may exist. For example, A and/or B may indicate the following three cases: Only A exists, both A and B exist, and only B exists.

It should be understood that, in the implementations provided in this application, "B corresponding to A" indicates that B is associated with A, and B may be determined according to A. However, it should be further understood that determining B according to A does not mean that B is determined according to A only, and B may also be determined according to A and/or other information.

A person of ordinary skill in the art may be aware that, in combination with the examples described in the implementations disclosed in this specification, units and algorithm steps may be implemented by electronic hardware, computer software, or a combination thereof. To clearly describe interchangeability between the hardware and the software, the foregoing generally describes composition and steps of each example according to functions. A person skilled in the art may use different methods to implement the described functions for each particular application, but it should not be considered that the implementation goes beyond the scope of the present disclosure.

It may be clearly understood by a person skilled in the art that, for the purpose of convenient and brief description, for a detailed working process of the foregoing system, apparatus, and unit, reference may be made to a corresponding process in the foregoing method implementations, and details are not described herein again.

In the several implementations provided in this application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the described apparatus implementation is merely an example. In addition, the shown or discussed mutual couplings or direct couplings or communication connections may be implemented by using some interfaces. The indirect couplings or communication connections between the apparatuses or units may be implemented in electrical, mechanical, or other forms.

The units described as separate parts may or may not be physically separated, and parts shown as units may or may not be physical units, may be located in one position, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual requirements to achieve the objectives of the solutions of the implementations.

In addition, functional units in the implementations of the present disclosure may be integrated into one processing unit, or each of the units may exist alone physically, or two or more units are integrated into one unit.

When the integrated unit is implemented in a form of a software functional unit and sold or used as an independent product, the integrated unit may be stored in a computer-readable storage medium. Based on such an understanding, the technical solutions of the present disclosure essentially, or the part contributing to the prior art, or some of the technical solutions may be implemented in a form of a software product. The software product is stored in a storage medium, and includes several instructions for instructing a computer device (which may be a personal computer, a server, a network device, or the like) to perform all or some of the steps of the methods described in the implementations of the present disclosure. The foregoing storage medium includes: any medium that can store program code, such as a USB flash drive, a removable hard disk, a read-only memory (Read-Only Memory, "ROM" for short), a random access memory (Random Access Memory, "RAM" for short), a magnetic disk, or an optical disc.

Claim 1:
A wireless communication method performed by a network device, comprising:
sending (S3100) uplink transmission resource indication information to user equipment, wherein the uplink transmission resource indication information indicates an uplink transmission resource comprises a part of a remaining resource, excluding a resource occupied by a PDCCH, in each subframe of M consecutive subframes, wherein M is an integer greater than or equal to <NUM>; wherein the uplink transmission resource comprises at least two sub transmission resources which do not overlap in time domain, and a granularity, in a time domain, of each of the at least two sub transmission resources is a preset symbol quantity; and
receiving (S3200) data packets from the user equipment on the at least two sub transmission resources, wherein the data packets are different retransmission redundancy versions, RVs, of a same data packet, or the data packet are same copies of a same data packet.