CN112688761B - HARQ processing method and device - Google Patents
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- CN112688761B CN112688761B CN201910995462.4A CN201910995462A CN112688761B CN 112688761 B CN112688761 B CN 112688761B CN 201910995462 A CN201910995462 A CN 201910995462A CN 112688761 B CN112688761 B CN 112688761B
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Abstract
The embodiment of the invention provides a HARQ processing method and device, wherein the method comprises the following steps: sending a first data packet to a terminal; the first data packet includes retransmission indication RI information and/or feedback indication FI information, the RI information indicates whether the network device performs retransmission of the first data packet to the terminal, and the FI information indicates whether the terminal performs feedback for the first data packet. In the embodiment of the invention, the network equipment sends the first data packet carrying the retransmission and/or feedback indication information to the terminal, and indicates whether the terminal performs retransmission and/or feedback through the retransmission and/or feedback indication information, and the data transmission can be successfully received and decoded all the time under the conditions of a network with a longer single transmission distance, a service without HARQ feedback and retransmission or a better channel quality, and the transmission delay and the load expenditure are reduced by simplifying the HARQ retransmission and feedback mechanism.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a HARQ processing method and device.
Background
For a downlink hybrid automatic repeat request (Hybrid Automatic Repeat reQuest, HARQ), feedback information is carried in downlink control information (Downlink Control Information, DCI), as follows:
In DCI1_0, PDSCH-to-HARQ_ feedback timing indicator-3bits
In DCI1_1, PDSCH-to-HARQ_ feedback timing indicator-0,1,2, or 3bits;
for uplink HARQ, the base station performs the HARQ process directly by scheduling retransmissions or new transmissions.
According to the current third generation partnership project (3rd Generation Partnership Project,3GPP) discussion progress, the HARQ problem in node-to-node (NTN) networks has reached the following conclusion:
NTN must support retransmission of one or more layers and the network may be configured;
the network should be able to configure the UE and mention if HARQ is "off. If HARQ is turned off, no feedback is transmitted. Influence on other programs and how to configure;
if HARQ feedback is disabled, blind HARQ (re-) transmissions are still possible to improve robustness. The meaning of blind HARQ retransmissions will be captured in the email discussion;
even if the HARQ feedback is disabled, the HARQ process is still configured;
enabling/disabling HARQ feedback is a network decision;
disable HARQ feedback functionality may be supported in NTN networks.
For a network with a relatively long single transmission distance (such as an NTN network, >100 ms), the conventional HARQ has the problems of long feedback delay of a feedback distance, large HARQ process (process), possibly too many and the like; meanwhile, for the service which does not need HARQ feedback and retransmission or the situation that the channel quality is better, the data transmission can be successfully received and decoded, and the feedback or retransmission belongs to a redundancy process.
Disclosure of Invention
The embodiment of the invention provides a HARQ processing method and device, which solve the problem that the existing HARQ process is not simplified enough.
According to a first aspect of an embodiment of the present invention, there is provided an HARQ processing method, applied to a network device, the method including:
sending a first data packet to a terminal;
the first data packet includes retransmission indication RI information and/or feedback indication FI information, where the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet.
Optionally, the RI information and/or FI information are carried in a medium access control layer sub-header MAC subheader of a medium access control layer protocol data unit MAC PDU in the first data packet;
or alternatively
The RI information and/or the FI information are carried in reserved bits of a media access control layer sub-protocol data unit (MAC sub PDU) in the first data packet;
or alternatively
The RI information and/or FI information are carried in a medium access control layer control unit MAC CE in the first data packet.
Optionally, when the RI information and/or the FI information are carried in the MAC subheader, the MAC subheader further includes a logical channel identifier LCID;
When the RI information and/or FI information are carried in the MAC CE, the MAC CE further includes a radio bearer RB index, where the RB index indicates whether the RI information and/or FI information are activated by the terminal.
Optionally, before the sending the first data packet to the terminal, the method further includes:
receiving a channel quality measurement result from a terminal;
and when the channel quality measurement result is not lower than a preset threshold value, executing the step of sending the first data packet to the terminal.
Optionally, when the channel quality measurement result is lower than a preset threshold, retransmitting a plurality of data packets sent to the terminal, and the FI information indicates the terminal to perform feedback for the first data packet.
According to a second aspect of an embodiment of the present invention, there is provided an HARQ processing method, applied to a terminal, the method including:
receiving a first data packet from a network device;
determining whether to retransmit and/or feed back according to the first data packet;
the first data packet includes RI information and/or FI information, where the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet.
Optionally, the RI information and/or FI information are carried in a MAC subheader of a MAC PDU in the first data packet;
or alternatively
The RI information and/or the FI information are carried in reserved bits of the MAC subPDU in the first data packet;
or alternatively
The RI information and/or FI information is carried in a MAC CE in the first data packet.
Optionally, the determining whether to perform retransmission and/or feedback according to the RI information and/or FI information includes:
judging whether the MAC CE carries the RI information and/or the FI information or not;
when the MAC CE carries the RI information and/or the FI information, determining whether to retransmit and/or feed back according to the RI information and/or the FI information;
or alternatively
Judging whether the first MAC sub header of the MAC PDU carries the RI information and/or the FI information;
when the first MAC sub header of the MAC PDU carries the RI information and/or the FI information, determining whether to carry out retransmission and/or feedback according to the RI information and/or the FI information;
or alternatively
Judging whether the MAC subPDU carries the RI information and/or the FI information;
and when the RI information and/or the FI information are carried in the MAC subPDU, determining whether to carry out retransmission and/or feedback according to the RI information and/or the FI information.
Optionally, before the receiving the first data packet from the network device, the method further comprises:
transmitting the channel quality measurement result to the network device;
and when the channel quality measurement result is not lower than a preset threshold value, executing the step of receiving the first data packet from the network equipment.
Optionally, when the channel quality measurement result is lower than a preset threshold, a plurality of retransmitted data packets are received from the network device, and the FI information indicates the terminal to perform feedback for the first data packet.
According to a third aspect of an embodiment of the present invention, there is provided a network device, comprising: a first transceiver and a first processor, wherein,
the first transceiver is configured to send a first data packet to a terminal;
the first data packet includes retransmission indication RI information and/or feedback indication FI information, where the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet.
Optionally, the RI information and/or FI information are carried in a medium access control layer sub-header MAC subheader of a medium access control layer protocol data unit MAC PDU in the first data packet;
Or alternatively
The RI information and/or the FI information are carried in reserved bits of a media access control layer sub-protocol data unit (MAC sub PDU) in the first data packet;
or alternatively
The RI information and/or FI information are carried in a medium access control layer control unit MAC CE in the first data packet.
Optionally, when the RI information and/or the FI information are carried in the MAC subheader, the MAC subheader further includes a logical channel identifier LCID;
when the RI information and/or FI information are carried in the MAC CE, the MAC CE further includes a radio bearer RB index, where the RB index indicates whether the RI information and/or FI information are activated by the terminal.
Optionally, the first transceiver is further configured to receive a channel quality measurement result from the terminal, and when the channel quality measurement result is not lower than a preset threshold, perform the step of sending the first data packet to the terminal.
Optionally, the first transceiver is further configured to retransmit a plurality of data packets that have been sent to the terminal when the channel quality measurement result is below a preset threshold, and the FI information indicates the terminal to perform feedback for the first data packet.
According to a fourth aspect of an embodiment of the present invention, there is provided a terminal including: a second transceiver and a second processor, wherein,
the second transceiver is configured to receive a first data packet from a network device;
the second processor is configured to determine whether to retransmit and/or feed back according to the first data packet;
the first data packet includes RI information and/or FI information, where the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet.
Optionally, the RI information and/or FI information are carried in a MAC subheader of a MAC PDU in the first data packet;
or alternatively
The RI information and/or the FI information are carried in reserved bits of the MAC subPDU in the first data packet;
or alternatively
The RI information and/or FI information is carried in a MAC CE in the first data packet.
Optionally, the second processor is further configured to determine whether the MAC CE carries the RI information and/or the FI information, and determine whether to perform retransmission and/or feedback according to the RI information and/or the FI information when the MAC CE carries the RI information and/or the FI information;
The second processor is further configured to determine whether the first MAC subheader of the MAC PDU carries the RI information and/or the FI information, and determine whether to perform retransmission and/or feedback according to the RI information and/or the FI information when the first MAC subheader of the MAC PDU carries the RI information and/or the FI information;
the second processor is further configured to determine whether the MAC sub pdu carries the RI information and/or the FI information, and determine whether to perform retransmission and/or feedback according to the RI information and/or the FI information when the MAC sub pdu carries the RI information and/or the FI information.
Optionally, the second transceiver is further configured to send a channel quality measurement result to the network device, and when the channel quality measurement result is not lower than a preset threshold value, perform the step of receiving the first data packet from the network device.
Optionally, the second transceiver is further configured to receive a plurality of retransmitted data packets from the network device when the channel quality measurement result is below a preset threshold, and the FI information indicates the terminal to perform feedback for the first data packet.
According to a fifth aspect of an embodiment of the present invention, there is provided a network device, including:
The first sending module is used for sending a first data packet to the terminal;
the first data packet includes retransmission indication RI information and/or feedback indication FI information, where the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet.
Optionally, the RI information and/or FI information are carried in a medium access control layer sub-header MAC subheader of a medium access control layer protocol data unit MAC PDU in the first data packet;
or alternatively
The RI information and/or the FI information are carried in reserved bits of a media access control layer sub-protocol data unit (MAC sub PDU) in the first data packet;
or alternatively
The RI information and/or FI information are carried in a medium access control layer control unit MAC CE in the first data packet.
Optionally, when the RI information and/or the FI information are carried in the MAC subheader, the MAC subheader further includes a logical channel identifier LCID;
when the RI information and/or FI information are carried in the MAC CE, the MAC CE further includes a radio bearer RB index, where the RB index indicates whether the RI information and/or FI information are activated by the terminal.
Optionally, the network device further includes:
and the second receiving module is used for receiving the channel quality measurement result from the terminal, and when the channel quality measurement result is not lower than a preset threshold value, the first sending module is instructed to send a first data packet to the terminal.
Optionally, the network device further includes:
and the second sending module is used for retransmitting a plurality of data packets sent to the terminal when the channel quality measurement result is lower than a preset threshold value, and the FI information indicates the terminal to feed back the first data packet.
According to a sixth aspect of an embodiment of the present invention, there is provided a terminal including:
a first receiving module, configured to receive a first data packet from a network device;
the first determining module is used for determining whether retransmission and/or feedback are carried out according to the first data packet;
the first data packet includes RI information and/or FI information, where the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet.
Optionally, the RI information and/or FI information are carried in a MAC subheader of a MAC PDU in the first data packet;
Or alternatively
The RI information and/or the FI information are carried in reserved bits of the MAC subPDU in the first data packet;
or alternatively
The RI information and/or FI information is carried in a MAC CE in the first data packet.
Optionally, the first determining module includes:
a first judging unit, configured to judge whether the MAC CE carries the RI information and/or the FI information;
a first determining unit, configured to determine whether to perform retransmission and/or feedback according to the RI information and/or FI information when the MAC CE carries the RI information and/or FI information;
a second judging unit, configured to judge whether the RI information and/or the FI information are carried in a first MAC subheader of the MAC PDU;
a second determining unit, configured to determine whether to perform retransmission and/or feedback according to the RI information and/or the FI information when the RI information and/or the FI information are carried in the first MAC subheader of the MAC PDU;
a third judging unit, configured to judge whether the MAC subPDU carries the RI information and/or the FI information;
and the third determining unit is used for determining whether retransmission and/or feedback is carried out according to the RI information and/or the FI information when the RI information and/or the FI information are carried in the MAC subPDU.
Optionally, the terminal further includes:
and the third sending module is used for sending a channel quality measurement result to the network equipment, and when the channel quality measurement result is not lower than a preset threshold value, the first receiving module is instructed to receive the first data packet from the network equipment.
Optionally, the terminal further includes:
and the third receiving module is used for receiving a plurality of retransmitted data packets from the network equipment when the channel quality measurement result is lower than a preset threshold value, and the FI information indicates the terminal to feed back the first data packet.
According to a seventh aspect of embodiments of the present invention, there is provided a communication device comprising a processor, a memory and a program stored on the memory and executable on the processor, the program when executed by the processor implementing the steps of the HARQ processing method according to the first aspect or the steps of the HARQ processing method according to the second aspect.
According to an eighth aspect of embodiments of the present invention, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the HARQ processing method according to the first aspect, or the steps of the HARQ processing method according to the second aspect.
In the embodiment of the invention, the network equipment sends the first data packet carrying the retransmission and/or feedback indication information to the terminal, and indicates whether the terminal performs retransmission and/or feedback through the retransmission and/or feedback indication information, and the data transmission can be successfully received and decoded all the time under the conditions of a network with a longer single transmission distance, a service without HARQ feedback and retransmission or a better channel quality, and the transmission delay and the load expenditure are reduced by simplifying the HARQ retransmission and feedback mechanism.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of an HARQ processing method according to an embodiment of the present invention;
FIG. 2a is a schematic diagram of a MAC sub-header according to an embodiment of the present invention;
FIG. 2b is a schematic diagram of a second embodiment of a MAC sub-header according to the present invention;
Fig. 2c is a schematic structural diagram of a MAC CE according to an embodiment of the present invention;
fig. 3 is a second flowchart of a HARQ processing method according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of determining retransmission and feedback by a terminal according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a network device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 7 is a second schematic structural diagram of a network device according to an embodiment of the present invention;
FIG. 8 is a second schematic diagram of a terminal according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a communication device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In embodiments of the invention, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
Relational terms such as "first" and "second", and the like, are used solely to distinguish one from another, and do not necessarily imply a relationship or order between such names.
The techniques described herein are not limited to fifth generation mobile communication (5 th-generation, 5G) systems and subsequent evolution communication systems, and are not limited to LTE/LTE evolution (LTE-Advanced, LTE-a) systems, and may also be used for various wireless communication systems such as code division multiple access (Code Division Multiple Access, CDMA), time division multiple access (Time Division Multiple Access, TDMA), frequency division multiple access (Frequency Division Multiple Access, FDMA), orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access, OFDMA), single-carrier frequency division multiple access (Single-carrier Frequency-Division Multiple Access, SC-FDMA), and other systems.
The terms "system" and "network" are often used interchangeably. A CDMA system may implement radio technologies such as CDMA2000, universal terrestrial radio access (Universal Terrestrial Radio Access, UTRA), and the like. UTRA includes wideband CDMA (Wideband Code Division Multiple Access, WCDMA) and other CDMA variants. TDMA systems may implement radio technologies such as the global system for mobile communications (Global System for Mobile Communication, GSM). OFDMA systems may implement radio technologies such as ultra mobile broadband (Ultra Mobile Broadband, UMB), evolved UTRA (E-UTRA), IEEE 802.11 ((Wi-Fi)), IEEE 802.16 ((WiMAX)), IEEE 802.20, flash-OFDM, etc. UTRA and E-UTRA are parts of the universal mobile telecommunications system (Universal Mobile Telecommunications System, UMTS). LTE and higher LTE (e.g., LTE-a) are new UMTS releases that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-a and GSM are described in the literature from an organization named "third generation partnership project" (3rd Generation Partnership Project,3GPP). CDMA2000 and UMB are described in the literature from an organization named "third generation partnership project 2" (3 GPP 2). The techniques described herein may be used for the systems and radio technologies mentioned above as well as for other systems and radio technologies.
In the embodiment of the present invention, the network device may be a network device (for example, a next generation base station (next generation node base station, gNB) or a transmission and reception point (transmission and reception point, TRP)) in a 5G (Fifth generation mobile communication technology) system.
The terminal may be a cell phone, tablet computer, notebook computer, ultra mobile personal computer (Ultra-Mobile Personal Computer, UMPC), netbook, personal digital assistant (Personal Digital Assistant, PDA), or the like.
Referring to fig. 1, an embodiment of the present invention provides a HARQ processing method, where an execution body of the method is a network device, and specific steps of the method are as follows:
step 101: sending a first data packet to a terminal;
in the embodiment of the present invention, the first data packet includes retransmission indication (Retransmission Indication, RI) information and/or feedback indication (Feedback Indication, FI) information, where the RI information indicates whether the terminal performs retransmission of the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet.
In practical applications, the network device may determine whether to retransmit and feed back according to practical situations, for example, for a network with a relatively long single transmission distance (such as NTN network, >100 ms); the HARQ feedback and retransmission service is not needed; the channel quality is better, the data transmission can be successfully received and decoded, and the like, and the embodiment of the invention does not limit the process of determining whether to retransmit and feed back according to the actual situation.
In the embodiment of the invention, the network equipment sends the first data packet carrying the retransmission and/or feedback indication information to the terminal, and indicates whether the terminal performs retransmission and/or feedback through the retransmission and/or feedback indication information, and the data transmission can be successfully received and decoded all the time under the conditions of a network with a longer single transmission distance, a service without HARQ feedback and retransmission or a better channel quality, and the transmission delay and the load expenditure are reduced by simplifying the HARQ retransmission and feedback mechanism.
Optionally, the embodiment of the present invention provides several examples of adding RI information and FI information in the first data packet:
example one: RI information and/or FI information are carried in a MAC subheader (subheader) of a medium access control layer protocol data unit (Media Access Control Protocol Data Unit, MAC PDU) in the first data packet, which is hereinafter abbreviated as MAC PDU level for convenience of description;
in the embodiment of the invention, a MAC subheader is newly added to the header of the MAC PDU in the first data packet, and RI information and FI information are filled in the MAC subheader, so that after the terminal receives the first data packet, whether to retransmit and feed back is determined by the RI information and the FI information in the first MAC subheader of the MAC PDU.
Optionally, a logical channel identifier (Logical Channel Identity, LCID) may also be included in the MAC subheader.
Referring to fig. 2a, an embodiment of the present invention provides a structure of a newly added MAC subheader, which includes:
RI field: i.e., RI information, indicating to the terminal whether the MAC PDU is to be retransmitted or not, alternatively, a "1" indicates that retransmission is to be performed and a "0" indicates that retransmission is not to be performed.
FI field: i.e. FI information, for indicating to the terminal whether the PDU needs feedback, optionally, setting to "1" indicates that feedback is needed, and "0" indicates that feedback is not needed.
LCID field: the added MAC subheader is dedicated to HARQ feedback and retransmission indication, and a new LCID value needs to be defined, optionally, as shown in table 1, the added MAC subheader is selected from the reserved values 33-51 of the uplink LCID, for example, 33 may be selected as the LCID value in the added MAC subheader.
TABLE 1
Example two: RI information and/or FI information are carried in reserved bits of MAC subPDU in the first data packet, for convenience of description, simply called subPDU level hereinafter;
in the embodiment of the invention, a new field is introduced to fill the reserved bit R bits of the MAC sub PDU according to whether the retransmission and the feedback are needed by different LCH (Logical Channel) services, and the retransmission and the feedback demand information of the sub PDU are indicated to the terminal.
Referring to fig. 2b, taking a MAC CE including a short BSR (Buffer Status Report) in a MAC PDU as an example to introduce an RI field and an FI field by using two existing R bits in a MAC subheader, the meaning of the RI and FI fields are the same as that of the RI and FI fields in the level of the MAC PDU, which will not be described again.
Example three: RI information and/or FI information are carried in a medium access control layer control unit (Media Access Control Control Unit, MAC CE) in a first data packet, for convenience of description, the RI information and/or FI information are hereinafter referred to as RB level;
in the embodiment of the invention, a new MAC CE is designed for a certain Radio Bearer (RB) and is used for indicating the requirement information of the data packet transmitted by the terminal on the RB for HARQ retransmission and feedback. The MAC CE includes RI information and/or FI information. It should be noted that, when transmitting the MAC CE, the network device may transmit it as a separate data packet, and need not be included in a MAC PDU.
Optionally, the MAC CE further includes an RB index, where the RB index indicates whether the terminal activates RI information and/or FI information.
Referring to fig. 2c, an embodiment of the present invention provides a structure of a MAC CE, including:
D i fields: i.e. RB index, representing DRB i Whether or not the lightweight HARQ function of (1) is activated, optionally, "0" means not activated, and "1" means activated. When the Di field is 1, the following RI is read again i Fields, FI i A field;
RI i fields: i.e. RI information for indicating DRBs i Whether the upper data packet is retransmitted or not, optionally, "0" indicates no retransmission, and "1" indicates retransmission;
FIi field: i.e. FI information, for indicating whether the data packet on DRBi needs feedback, optionally, "0" indicates that feedback is not needed, and "1" indicates that feedback is needed.
Optionally, as shown in table 1, the LCID value in the MAC subheader of the new MAC CE is selected from the reserved values 33-51 of the uplink LCID, for example 33 may be selected.
Further, for downlink HARQ, in order to guarantee reliability without feedback, for example: in order to solve the problem that the network device needs to retransmit the data packet when the original terminal does not receive the data or does not decode the data successfully, the method further includes the following steps before the step 101:
(1) Receiving a channel quality measurement result from a terminal;
in the embodiment of the invention, the terminal reports the quality measurement result to the network equipment.
(2) When the channel quality measurement result is not lower than the preset threshold value, executing step 101; retransmitting a plurality of data packets which are transmitted to the terminal when the channel quality measurement result is lower than a preset threshold value, and enabling the FI information to instruct the terminal to feed back the first data packet;
In the embodiment of the invention, the network equipment does not discard a plurality of data packets which are recently sent to the terminal, judges according to the channel quality measurement result reported by the terminal, and retransmits the plurality of data packets which are recently sent to the terminal and indicates the terminal to feed back through the method once judging that the channel quality is lower than a preset threshold value; when the channel quality is judged not to be lower than the preset threshold, the network equipment decides whether to instruct the terminal to retransmit and feed back according to the actual situation according to the method.
Referring to fig. 3, an embodiment of the present invention provides another HARQ processing method, where an execution body of the method is a terminal, and specific steps of the method are as follows:
step 301: receiving a first data packet from a network device;
in the embodiment of the present invention, the first data packet includes RI information and/or FI information, where the RI information indicates whether the terminal performs retransmission of the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet.
The manner in which the RI information and the FI information are added to the first data packet may refer to the related description of the network device part, and will not be repeated here.
Step 302: determining whether retransmission and/or feedback is carried out according to the first data packet;
In the embodiment of the invention, the terminal determines whether the network device retransmits the first data packet according to the RI information in the first data packet, and determines whether to feed back the first data packet according to the FI information in the first data packet.
Further, according to the filling positions of the RI information and the FI information in the first data packet, the terminal determines whether to perform retransmission and feedback, including the following steps:
(1) Judging whether the MAC CE carries RI information and/or FI information or not;
for RB level, when the MAC CE carries RI information and/or FI information, determining whether to retransmit and/or feed back according to the RI information and/or the FI information;
(2) Judging whether the first MAC subheader of the MAC PDU carries RI information and/or FI information;
for the MAC PDU level, when the first MAC subheader of the MAC PDU carries RI information and/or FI information, determining whether to retransmit and/or feed back according to the RI information and/or the FI information;
(3) Judging whether the MAC subPDU carries RI information and/or FI information;
for the level of the sub-PDU, when the RI information and/or the FI information are carried in the MAC sub-PDU, whether retransmission and/or feedback are carried out is determined according to the RI information and/or the FI information.
It should be noted that, the steps (1) to (3) are mutually exclusive, the execution sequence of each judgment step can be adjusted, that is, any one judgment step can be executed as an initial judgment step, and if the judgment result is yes, retransmission and feedback are performed according to the indication of RI information and FI information; and when the judging result is negative, executing other judging steps.
Further, referring to fig. 4, considering that the terminal has a decoding order in the unpacking, the judgment is made in the order of RB level, MAC PDU level, subPDU level.
In the embodiment of the invention, a terminal receives a first data packet, judges whether an MAC CE of the data packet only carries RI and FI information, if so, firstly, judges whether Di of the MAC CE is 1, if so, starts to read RIi fields and FIi fields in the MAC CE, and carries out corresponding processing according to the instruction; if not, judging whether the first MAC sub header of the data packet carries the RI and FI information, if so, reading the RI field and the FI field in the sub header, and carrying out corresponding processing according to the instruction; if not, judging whether the data packet carries the MAC sub PDU containing RI and FI information, if so, starting to read the RI field and the FI field in the sub PDU, and carrying out corresponding processing according to the instruction, and for the sub PDU which is to be retransmitted, recombining the sub PDU into any PDU to be transmitted (not necessarily carrying the same information as the previous PDU) when the next transmission is carried out.
In the embodiment of the invention, the network equipment sends the first data packet carrying the retransmission and/or feedback indication information to the terminal, and indicates whether the terminal performs retransmission and/or feedback through the retransmission and/or feedback indication information, and the data transmission can be successfully received and decoded all the time under the conditions of a network with a longer single transmission distance, a service without HARQ feedback and retransmission or a better channel quality, and the transmission delay and the load expenditure are reduced by simplifying the HARQ retransmission and feedback mechanism.
Further, for downlink HARQ, in order to guarantee reliability without feedback, for example: in order to solve the problem that the network device needs to retransmit the data packet when the original terminal does not receive the data or does not decode the data successfully, the method further includes the following steps before the step 101:
(1) Receiving a channel quality measurement result from a terminal;
in the embodiment of the invention, the terminal reports the quality measurement result to the network equipment.
(2) When the channel quality measurement result is not lower than the preset threshold value, executing step 101; retransmitting a plurality of data packets which are transmitted to the terminal when the channel quality measurement result is lower than a preset threshold value, and enabling the FI information to instruct the terminal to feed back the first data packet;
in the embodiment of the invention, the network equipment does not discard a plurality of data packets (namely data packets) which are recently sent to the terminal, judges according to the channel quality measurement result reported by the terminal, and retransmits a plurality of data packets which are recently sent to the terminal and indicates the terminal to feed back through the method once judging that the channel quality is lower than a preset threshold value; when the channel quality is judged not to be lower than the preset threshold, the network equipment decides whether to instruct the terminal to retransmit and feed back according to the actual situation according to the method.
Referring to fig. 5, an embodiment of the present invention provides a network device 500, including: a first transceiver 501 and a first processor 502;
wherein, the first transceiver 501 is configured to send a first data packet to a terminal;
the first data packet includes retransmission indication RI information and/or feedback indication FI information, where the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet.
Optionally, the RI information and/or FI information are carried in a medium access control layer sub-header MAC subheader of a medium access control layer protocol data unit MAC PDU in the first data packet;
or alternatively
The RI information and/or the FI information are carried in reserved bits of a media access control layer sub-protocol data unit (MAC sub PDU) in the first data packet;
or alternatively
The RI information and/or FI information are carried in a medium access control layer control unit MAC CE in the first data packet.
Optionally, when the RI information and/or the FI information are carried in the MAC subheader, the MAC subheader further includes a logical channel identifier LCID;
When the RI information and/or FI information are carried in the MAC CE, the MAC CE further includes a radio bearer RB index, where the RB index indicates whether the RI information and/or FI information are activated by the terminal.
Optionally, the first transceiver 501 is further configured to receive a channel quality measurement result from the terminal, and when the channel quality measurement result is not lower than a preset threshold, perform the step of sending the first data packet to the terminal.
Optionally, the first transceiver 501 is further configured to retransmit a plurality of data packets that have been sent to the terminal when the channel quality measurement result is below a preset threshold, and the FI information indicates the terminal to perform feedback for the first data packet.
In the embodiment of the invention, the network equipment sends the first data packet carrying the retransmission and/or feedback indication information to the terminal, and indicates whether the terminal performs retransmission and/or feedback through the retransmission and/or feedback indication information, and the data transmission can be successfully received and decoded all the time under the conditions of a network with a longer single transmission distance, a service without HARQ feedback and retransmission or a better channel quality, and the transmission delay and the load expenditure are reduced by simplifying the HARQ retransmission and feedback mechanism.
Referring to fig. 6, an embodiment of the present invention provides a terminal 600, including: a second transceiver 601 and a second processor 602;
wherein the second transceiver 601 is configured to receive a first data packet from a network device;
the second processor 602 is configured to determine whether to retransmit and/or feedback according to the first data packet;
the first data packet includes RI information and/or FI information, where the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet.
Optionally, the RI information and/or FI information are carried in a MAC subheader of a MAC PDU in the first data packet;
or alternatively
The RI information and/or the FI information are carried in reserved bits of the MAC subPDU in the first data packet;
or alternatively
The RI information and/or FI information is carried in a MAC CE in the first data packet.
Optionally, the second processor is further configured to determine whether the MAC CE carries the RI information and/or the FI information, and determine whether to perform retransmission and/or feedback according to the RI information and/or the FI information when the MAC CE carries the RI information and/or the FI information;
The second processor 602 is further configured to determine whether the first MAC sub-header of the MAC PDU carries the RI information and/or the FI information, and determine whether to perform retransmission and/or feedback according to the RI information and/or the FI information when the first MAC sub-header of the MAC PDU carries the RI information and/or the FI information;
the second processor 602 is further configured to determine whether the MAC sub pdu carries the RI information and/or the FI information, and determine whether to perform retransmission and/or feedback according to the RI information and/or the FI information when the MAC sub pdu carries the RI information and/or the FI information.
Optionally, the second transceiver 601 is further configured to send a channel quality measurement result to the network device, and when the channel quality measurement result is not lower than a preset threshold, perform the step of receiving the first data packet from the network device.
Optionally, the second transceiver 601 is further configured to receive a plurality of retransmitted data packets from the network device when the channel quality measurement result is below a preset threshold, and the FI information indicates the terminal to perform feedback for the first data packet.
In the embodiment of the invention, the network equipment sends the first data packet carrying the retransmission and/or feedback indication information to the terminal, and indicates whether the terminal performs retransmission and/or feedback through the retransmission and/or feedback indication information, and the data transmission can be successfully received and decoded all the time under the conditions of a network with a longer single transmission distance, a service without HARQ feedback and retransmission or a better channel quality, and the transmission delay and the load expenditure are reduced by simplifying the HARQ retransmission and feedback mechanism.
Referring to fig. 7, an embodiment of the present invention provides another network device 700, including:
a first sending module 701, configured to send a first data packet to a terminal;
the first data packet includes retransmission indication RI information and/or feedback indication FI information, where the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet.
Optionally, the RI information and/or FI information are carried in a medium access control layer sub-header MAC subheader of a medium access control layer protocol data unit MAC PDU in the first data packet;
or alternatively
The RI information and/or the FI information are carried in reserved bits of a media access control layer sub-protocol data unit (MAC sub PDU) in the first data packet;
or alternatively
The RI information and/or FI information are carried in a medium access control layer control unit MAC CE in the first data packet.
Optionally, when the RI information and/or the FI information are carried in the MAC subheader, the MAC subheader further includes a logical channel identifier LCID;
when the RI information and/or FI information are carried in the MAC CE, the MAC CE further includes a radio bearer RB index, where the RB index indicates whether the RI information and/or FI information are activated by the terminal.
Optionally, the network device further includes:
and the second receiving module is used for receiving the channel quality measurement result from the terminal, and when the channel quality measurement result is not lower than a preset threshold value, the first sending module is instructed to send a first data packet to the terminal.
Optionally, the network device further includes:
and the second sending module is used for retransmitting a plurality of data packets sent to the terminal when the channel quality measurement result is lower than a preset threshold value, and the FI information indicates the terminal to feed back the first data packet.
In the embodiment of the invention, the network equipment sends the first data packet carrying the retransmission and/or feedback indication information to the terminal, and indicates whether the terminal performs retransmission and/or feedback through the retransmission and/or feedback indication information, and the data transmission can be successfully received and decoded all the time under the conditions of a network with a longer single transmission distance, a service without HARQ feedback and retransmission or a better channel quality, and the transmission delay and the load expenditure are reduced by simplifying the HARQ retransmission and feedback mechanism.
Referring to fig. 8, an embodiment of the present invention provides another terminal 800, including:
a first receiving module 801, configured to receive a first data packet from a network device;
A first determining module 802, configured to determine whether to retransmit and/or feed back according to the first data packet;
the first data packet includes RI information and/or FI information, where the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet.
Optionally, the RI information and/or FI information are carried in a MAC subheader of a MAC PDU in the first data packet;
or alternatively
The RI information and/or the FI information are carried in reserved bits of the MAC subPDU in the first data packet;
or alternatively
The RI information and/or FI information is carried in a MAC CE in the first data packet.
Optionally, the first determining module includes:
a first judging unit, configured to judge whether the MAC CE carries the RI information and/or the FI information;
a first determining unit, configured to determine whether to perform retransmission and/or feedback according to the RI information and/or FI information when the MAC CE carries the RI information and/or FI information;
a second judging unit, configured to judge whether the RI information and/or the FI information are carried in a first MAC subheader of the MAC PDU;
A second determining unit, configured to determine whether to perform retransmission and/or feedback according to the RI information and/or the FI information when the RI information and/or the FI information are carried in the first MAC subheader of the MAC PDU;
a third judging unit, configured to judge whether the MAC subPDU carries the RI information and/or the FI information;
and the third determining unit is used for determining whether retransmission and/or feedback is carried out according to the RI information and/or the FI information when the RI information and/or the FI information are carried in the MAC subPDU.
Optionally, the terminal further includes:
and the third sending module is used for sending a channel quality measurement result to the network equipment, and when the channel quality measurement result is not lower than a preset threshold value, the first receiving module is instructed to receive the first data packet from the network equipment.
Optionally, the terminal further includes:
and the third receiving module is used for receiving a plurality of retransmitted data packets from the network equipment when the channel quality measurement result is lower than a preset threshold value, and the FI information indicates the terminal to feed back the first data packet.
In the embodiment of the invention, the network equipment sends the first data packet carrying the retransmission and/or feedback indication information to the terminal, and indicates whether the terminal performs retransmission and/or feedback through the retransmission and/or feedback indication information, and the data transmission can be successfully received and decoded all the time under the conditions of a network with a longer single transmission distance, a service without HARQ feedback and retransmission or a better channel quality, and the transmission delay and the load expenditure are reduced by simplifying the HARQ retransmission and feedback mechanism.
Referring to fig. 9, an embodiment of the present invention provides a communication device 900 including: processor 901, transceiver 902, memory 903, and bus interfaces.
Among other things, the processor 901 may be responsible for managing the bus architecture and general processing. The memory 903 may store data used by the processor 901 in performing operations.
In an embodiment of the present invention, the communication device 900 may further include: a program stored on the memory 903 and executable on the processor 901, which when executed by the processor 901, implements the steps of the method provided by the embodiments of the present invention.
In fig. 9, a bus architecture may comprise any number of interconnected buses and bridges, with various circuits of the one or more processors, represented in particular by processor 901, and the memory, represented by memory 903, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., all as are well known in the art and, therefore, further description of embodiments of the present invention will not be provided. The bus interface provides an interface. The transceiver 902 may be a number of elements, i.e., include a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium.
The embodiment of the application also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the processes of the above method embodiment, and can achieve the same technical effects, and in order to avoid repetition, the description is omitted here. Wherein the computer readable storage medium is selected from Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely illustrative of specific embodiments of the present application, and the scope of the present application is not limited thereto, but any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (12)
1. A hybrid automatic repeat request, HARQ, processing method applied to a network device, the method comprising:
sending a first data packet to a terminal;
the first data packet includes retransmission indication RI information and/or feedback indication FI information, where the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet;
the RI information and/or the FI information are carried in a media access control layer sub-header (MAC subheader) of a media access control layer protocol data unit (MAC PDU) in the first data packet;
or alternatively
The RI information and/or the FI information are carried in reserved bits of a media access control layer sub-protocol data unit (MAC sub PDU) in the first data packet;
or alternatively
The RI information and/or the FI information are carried in a media access control layer control unit (MAC CE) in the first data packet;
when the RI information and/or the FI information are carried in the MAC sub-header, the MAC sub-header further comprises a logic channel identification LCID;
when the RI information and/or FI information are carried in the MAC CE, the MAC CE further includes a radio bearer RB index, where the RB index indicates whether the terminal activates the RI information and/or FI information function.
2. The method of claim 1, wherein prior to said sending the first data packet to the terminal, the method further comprises:
receiving a channel quality measurement result from a terminal;
and when the channel quality measurement result is not lower than a preset threshold value, executing the step of sending the first data packet to the terminal.
3. The method of claim 2, wherein the step of determining the position of the substrate comprises,
and retransmitting the plurality of data packets which are sent to the terminal when the channel quality measurement result is lower than a preset threshold value, wherein the FI information indicates the terminal to feed back the first data packet.
4. A HARQ processing method, applied to a terminal, characterized in that the method comprises:
receiving a first data packet from a network device;
determining whether to retransmit and/or feed back according to the first data packet;
the first data packet includes RI information and/or FI information, the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet;
the RI information and/or the FI information are carried in a MAC subheader of a MAC PDU in the first data packet;
Or alternatively
The RI information and/or the FI information are carried in reserved bits of the MAC subPDU in the first data packet;
or alternatively
The RI information and/or the FI information are carried in a MAC CE in the first data packet;
the determining whether to perform retransmission and/or feedback according to the RI information and/or FI information includes:
judging whether the MAC CE carries the RI information and/or the FI information or not;
when the MAC CE carries the RI information and/or the FI information, determining whether to retransmit and/or feed back according to the RI information and/or the FI information;
or alternatively
Judging whether the first MAC sub header of the MAC PDU carries the RI information and/or the FI information;
when the first MAC sub header of the MAC PDU carries the RI information and/or the FI information, determining whether to carry out retransmission and/or feedback according to the RI information and/or the FI information;
or alternatively
Judging whether the MAC subPDU carries the RI information and/or the FI information;
and when the RI information and/or the FI information are carried in the MAC subPDU, determining whether to carry out retransmission and/or feedback according to the RI information and/or the FI information.
5. The method of claim 4, wherein prior to the receiving the first data packet from the network device, the method further comprises:
Transmitting the channel quality measurement result to the network device;
and when the channel quality measurement result is not lower than a preset threshold value, executing the step of receiving the first data packet from the network equipment.
6. The method of claim 5, wherein the step of determining the position of the probe is performed,
and when the channel quality measurement result is lower than a preset threshold value, receiving a plurality of retransmitted data packets from the network equipment, and indicating the terminal to feed back the first data packets by the FI information.
7. A network device, comprising: a first transceiver and a first processor, wherein,
the first transceiver is configured to send a first data packet to a terminal;
the first data packet includes retransmission indication RI information and/or feedback indication FI information, where the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet;
the RI information and/or the FI information are carried in a MAC subheader of a MAC PDU in the first data packet;
or alternatively
The RI information and/or the FI information are carried in reserved bits of the MAC subPDU in the first data packet;
Or alternatively
The RI information and/or the FI information are carried in a MAC CE in the first data packet;
when the RI information and/or the FI information are carried in the MAC sub-header, the MAC sub-header further comprises an LCID;
when the RI information and/or the FI information are carried in the MAC CE, the MAC CE also comprises an RB index, and the RB index indicates whether the terminal activates the functions of the RI information and/or the FI information.
8. A terminal, comprising: a second transceiver and a second processor, wherein,
the second transceiver is configured to receive a first data packet from a network device;
the second processor is configured to determine whether to retransmit and/or feed back according to the first data packet;
the first data packet includes RI information and/or FI information, the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet;
the RI information and/or the FI information are carried in a MAC subheader of a MAC PDU in the first data packet;
or alternatively
The RI information and/or the FI information are carried in reserved bits of the MAC subPDU in the first data packet;
Or alternatively
The RI information and/or the FI information are carried in a MAC CE in the first data packet;
the second processor is further configured to:
judging whether the MAC CE carries the RI information and/or the FI information or not;
when the MAC CE carries the RI information and/or the FI information, determining whether to retransmit and/or feed back according to the RI information and/or the FI information;
or alternatively
Judging whether the first MAC sub header of the MAC PDU carries the RI information and/or the FI information;
when the first MAC sub header of the MAC PDU carries the RI information and/or the FI information, determining whether to carry out retransmission and/or feedback according to the RI information and/or the FI information;
or alternatively
Judging whether the MAC subPDU carries the RI information and/or the FI information;
and when the RI information and/or the FI information are carried in the MAC subPDU, determining whether to carry out retransmission and/or feedback according to the RI information and/or the FI information.
9. A network device, comprising:
the first sending module is used for sending a first data packet to the terminal;
the first data packet includes retransmission indication RI information and/or feedback indication FI information, where the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet;
The RI information and/or the FI information are carried in a MAC subheader of a MAC PDU in the first data packet;
or alternatively
The RI information and/or the FI information are carried in reserved bits of the MAC subPDU in the first data packet;
or alternatively
The RI information and/or the FI information are carried in a MAC CE in the first data packet;
when the RI information and/or the FI information are carried in the MAC sub-header, the MAC sub-header further comprises an LCID;
when the RI information and/or the FI information are carried in the MAC CE, the MAC CE also comprises an RB index, and the RB index indicates whether the terminal activates the functions of the RI information and/or the FI information.
10. A terminal, comprising:
a first receiving module, configured to receive a first data packet from a network device;
the first determining module is used for determining whether retransmission and/or feedback are carried out according to the first data packet;
the first data packet includes RI information and/or FI information, the RI information indicates to the terminal whether the network device retransmits the first data packet, and the FI information indicates whether the terminal performs feedback for the first data packet;
The RI information and/or the FI information are carried in a MAC subheader of a MAC PDU in the first data packet;
or alternatively
The RI information and/or the FI information are carried in reserved bits of the MAC subPDU in the first data packet;
or alternatively
The RI information and/or the FI information are carried in a MAC CE in the first data packet;
the first determining module includes:
a first judging unit, configured to judge whether the MAC CE carries the RI information and/or the FI information;
a first determining unit, configured to determine whether to perform retransmission and/or feedback according to the RI information and/or FI information when the MAC CE carries the RI information and/or FI information;
a second judging unit, configured to judge whether the RI information and/or the FI information are carried in a first MAC subheader of the MAC PDU;
a second determining unit, configured to determine whether to perform retransmission and/or feedback according to the RI information and/or the FI information when the RI information and/or the FI information are carried in the first MAC subheader of the MAC PDU;
a third judging unit, configured to judge whether the MAC subPDU carries the RI information and/or the FI information;
and the third determining unit is used for determining whether retransmission and/or feedback is carried out according to the RI information and/or the FI information when the RI information and/or the FI information are carried in the MAC subPDU.
11. A communication device comprising a processor, a memory and a program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the HARQ processing method of any of claims 1 to 3 or the steps of the HARQ processing method of any of claims 4 to 6.
12. A computer readable storage medium, characterized in that the computer readable storage medium stores thereon a computer program, which when executed by a processor, implements the steps of the HARQ processing method according to any of claims 1 to 3, or the steps of the HARQ processing method according to any of claims 4 to 6.
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