CN108400843B

CN108400843B - Retransmission feedback and triggering method and device

Info

Publication number: CN108400843B
Application number: CN201710068023.XA
Authority: CN
Inventors: 王文焕; 杨瑾; 黄双红; 陈杰; 卢有雄
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2017-02-07
Filing date: 2017-02-07
Publication date: 2024-03-05
Anticipated expiration: 2037-02-07
Also published as: CN108400843A; WO2018145502A1

Abstract

The invention discloses a retransmission feedback and triggering method and device, comprising the following steps: a control channel for receiving the broadcast message; if the decoding check of the control channel is correct, decoding and checking a service channel on the resource indicated by the control channel; obtaining feedback information corresponding to the broadcast message according to the decoding verification result of the service channel; measuring channel parameters; judging whether feedback of feedback information is needed on a feedback channel or not according to the feedback information and the channel parameters; and if necessary, carrying out code modulation on the feedback information, and then carrying out spread spectrum mapping on a time-frequency domain to a feedback channel for transmission. Receiving feedback information on a feedback channel and decoding the feedback information, and measuring the energy of the feedback channel; judging whether the retransmission process needs to be triggered according to at least one of the following steps: the decoding result of the feedback information, the energy of the feedback channels, the number of the feedback channels and the type of the broadcast message.

Description

Retransmission feedback and triggering method and device

Technical Field

The present invention relates to the field of mobile communications, and in particular, to a retransmission feedback and triggering method and apparatus for a broadcast system.

Background

In the field of mobile communications, broadcast communications are typically one-to-many communications, and there are mainly one-to-many communications in which a base station broadcasts messages and an internet of vehicles system. The broadcasting communication of the internet of vehicles system requires higher reliability, so that the reliability of the broadcasting communication needs to be further improved through feedback and retransmission.

The internet of vehicles system is a system for providing vehicle information through devices such as sensors, vehicle-mounted terminals and electronic tags which are arranged on vehicles, realizing interconnection and intercommunication among vehicles (V2V, vehicle to Vehicle), vehicles and people (V2P, vehicle to Person) and vehicles and infrastructures (V2I, vehicle to Infrastructure) by adopting various communication technologies, extracting and sharing information on an information network platform, and effectively utilizing the information and the like, and effectively controlling the vehicles and providing comprehensive services. The vehicle networking can realize vehicle information notification and collision danger early warning based on communication, and real-time information interaction among vehicles, vehicles and road side facilities is realized by utilizing an advanced wireless communication technology and a new generation information processing technology, so that the vehicle networking informs each other of the current state (comprising the position, speed, acceleration and running path of the vehicle) and the known road environment information, cooperatively senses the road danger condition, provides various collision early warning information in time, prevents the occurrence of road traffic safety accidents, and becomes a new idea for solving the road traffic safety problem at present.

In the V2X communication system, mainly the broadcast communication mode is used, each UE sends its own broadcast message to be notified, and it is known that the broadcast system generally cannot know the status of the receiving UE, and generally uses a lower code rate and a fixed retransmission technique to ensure the reliability of the receiving.

Disclosure of Invention

In order to solve the technical problems, the embodiment of the invention provides a retransmission feedback and triggering method and device.

The retransmission feedback method provided by the embodiment of the invention comprises the following steps:

at least one of the following feedback information corresponding to the broadcast message is obtained: ACK information, NACK information;

measuring at least one of the following channel parameters: the energy of the control channel, the energy of the service channel and the distance between the broadcast message receiving end and the broadcast message transmitting end;

judging whether feedback of feedback information is needed on a feedback channel or not according to the feedback information and the channel parameters;

and if feedback of feedback information is needed on a feedback channel, performing code modulation on the feedback information, and then performing spread spectrum mapping on a time-frequency domain to the feedback channel for transmission.

In the embodiment of the present invention, at least one of the following feedback information corresponding to the broadcast message is obtained: positive acknowledgement, ACK, information, negative acknowledgement, NACK, information, including:

receiving a control channel of a broadcast message, and performing decoding verification on the control channel;

if the decoding check of the control channel is correct, decoding and checking a service channel on the resource indicated by the control channel;

according to the decoding check result of the service channel, at least one of the following feedback information corresponding to the broadcast message is obtained: ACK information, NACK information.

In the embodiment of the present invention, the determining whether feedback information needs to be fed back on a feedback channel includes: judging whether feedback information feedback is needed on a feedback channel by adopting a judgment criterion; wherein the decision criteria includes at least one of:

feeding back ACK information on an ACK feedback channel if at least one of the following conditions is met: decoding and checking the service channel to be ACK information, wherein the energy of the service channel is larger than a first energy threshold value, and the distance between a broadcast message receiving end and a broadcast message sending end is smaller than a first distance threshold value;

feeding back NACK information on a first NACK feedback channel if at least one of the following conditions is met: decoding and checking the service channel to be NACK information, wherein the energy of the service channel is larger than a first energy threshold value, and the distance between a broadcast message receiving end and a broadcast message transmitting end is smaller than a first distance threshold value;

Feeding back NACK information on a second NACK feedback channel if at least one of the following conditions is met: the decoding check control channel is NACK information, the energy of the control channel is larger than a second energy threshold value, the distance between the broadcast message receiving end and the broadcast message transmitting end is smaller than a second distance threshold value, and a second NACK feedback channel exists.

In the embodiment of the present invention, the spreading mapping of the feedback information on the time-frequency domain after the code modulation is performed to the feedback channel for transmission includes:

multiplying the feedback information after code modulation in the frequency domain by the following orthogonal sequences: fixed orthogonal sequences, or orthogonal sequences randomly selected from within a set of orthogonal sequences.

multiplying the feedback information after code modulation by the following orthogonal sequences in the time domain: the method comprises the steps of selecting fixed orthogonal sequences, or orthogonal sequences randomly selected from an orthogonal sequence group, selecting corresponding orthogonal sequences according to PSCCH indication of a transmitting terminal UE, or selecting corresponding orthogonal sequences according to characteristics of a receiving UE.

The retransmission triggering method provided by the embodiment of the invention comprises the following steps:

Receiving feedback information on a feedback channel and decoding the feedback information, and measuring the energy of the feedback channel;

judging whether the retransmission process needs to be triggered according to at least one of the following steps: the decoding result of the feedback information, the energy of the feedback channels, the number of the feedback channels and the type of the broadcast message.

In the embodiment of the present invention, the determining whether the retransmission process needs to be triggered includes: judging whether a retransmission process needs to be triggered or not by adopting a judgment criterion; wherein the decision criteria includes at least one of:

if the energy of the NACK feedback channel is larger than a first preset value, triggering a retransmission process;

if the ratio of the energy of the NACK feedback channel to the energy of the ACK feedback channel is larger than a second preset value, triggering a retransmission process;

if the number of NACK information in the feedback information is larger than a third preset value, triggering a retransmission process;

if the ratio of the number of NACK information in the feedback information to the number of ACK feedback channels is larger than a fourth preset value, triggering a retransmission process;

if the ratio of the number of NACK information in the feedback information to the number of required feedback channels is greater than a fifth preset value, triggering a retransmission process;

And if the ratio of the number of the required feedback channels to the sum of the number of NACK information and the number of ACK information in the feedback information is greater than a sixth preset value, triggering a retransmission process.

In the embodiment of the present invention, the feedback channel satisfies at least one of the following configurations:

the resources of the feedback channel have a one-to-one correspondence with the control channel and/or the data channel of the broadcast message;

the control channels and/or the data channels of the broadcast messages correspond to the resources of one NACK message, and the code words adopted by the feedback information have one-to-one correspondence with the control channels and/or the data channels of the broadcast messages;

wherein the one-to-one correspondence is determined by at least one of: a pre-configuration mode, a negotiation mode and a mode indicated by a broadcast message sending end.

In an embodiment of the present invention, the feedback channel includes at least one of: one NACK channel, a pair of ACKs, a NACK channel, a second NACK channel.

In the embodiment of the present invention, the indication manner of the broadcast message sending end includes at least one of the following:

the broadcast message sending end indicates whether feedback is needed on the resources of the feedback information corresponding to one by one;

The broadcast message sending end indicates the feedback information and the resource of the feedback information.

In the embodiment of the present invention, the resource of the feedback information is indicated by at least one of the following indication modes:

index of feedback resource with fixed time domain bias is used for indication, time domain is used for indication, frequency domain is used for indication, and time-frequency domain combination is used for indication.

In the embodiment of the present invention, the feedback information resource is a set of orthogonal code groups, where each code word in the orthogonal code groups corresponds to a sequence number.

In the embodiment of the present invention, the broadcast message is a periodic broadcast message, and the method further includes:

in the next transmission period of the broadcast message, adjusting the transmission times, modulation and coding strategies or power parameters; or,

in the present period of the broadcast message, re-selecting resources for the broadcast message, and adjusting the transmission times, modulation and coding strategies or power parameters.

The retransmission feedback device provided by the embodiment of the invention comprises:

an obtaining unit, configured to obtain at least one of the following feedback information corresponding to the broadcast message: ACK information, NACK information;

a measurement unit for measuring at least one of the following channel parameters: the energy of the control channel, the energy of the service channel and the distance between the broadcast message receiving end and the broadcast message transmitting end;

The decision unit is used for judging whether feedback of the feedback information is needed on a feedback channel according to the feedback information and the channel parameters;

and the sending unit is used for carrying out spread spectrum mapping on the time-frequency domain after the feedback information is coded and modulated to the feedback channel for sending if the feedback of the feedback information is needed on the feedback channel.

In an embodiment of the present invention, the apparatus further includes:

a receiving unit for receiving a control channel of the broadcast message;

a decoding and checking unit, configured to perform decoding and checking on the control channel; if the decoding check of the control channel is correct, decoding and checking a service channel on the resource indicated by the control channel;

the acquiring unit is specifically configured to obtain at least one of the following feedback information corresponding to the broadcast message according to a decoding verification result of the service channel: ACK information, NACK information.

In the embodiment of the present invention, the decision unit is specifically configured to: judging whether feedback information feedback is needed on a feedback channel by adopting a judgment criterion; wherein the decision criteria includes at least one of:

In an embodiment of the present invention, the apparatus further includes:

the processing unit is used for spreading and mapping the feedback information after code modulation on a time-frequency domain to a feedback channel for transmission, and multiplying the code modulated feedback information on the frequency domain by the following orthogonal sequences: fixed orthogonal sequences, or orthogonal sequences randomly selected from within a set of orthogonal sequences.

In the embodiment of the present invention, the processing unit is further configured to multiply the feedback information after the code modulation by the following orthogonal sequences in the time domain: the method comprises the steps of selecting fixed orthogonal sequences, or orthogonal sequences randomly selected from an orthogonal sequence group, selecting corresponding orthogonal sequences according to PSCCH indication of a transmitting terminal UE, or selecting corresponding orthogonal sequences according to characteristics of a receiving UE.

The retransmission triggering device provided by the embodiment of the invention comprises the following components:

a receiving unit for receiving feedback information on a feedback channel and decoding the feedback information;

a measuring unit for measuring energy of the feedback channel;

the decision unit is used for judging whether the retransmission process needs to be triggered according to at least one of the following steps: the decoding result of the feedback information, the energy of the feedback channels, the number of the feedback channels and the type of the broadcast message.

In the embodiment of the present invention, the decision unit is specifically configured to: judging whether a retransmission process needs to be triggered or not by adopting a judgment criterion; wherein the decision criteria includes at least one of:

In an embodiment of the present invention, the broadcast message is a periodic broadcast message, and the apparatus further includes:

the processing unit is used for adjusting the sending times, the modulation and coding strategy or the power parameter in the next sending period of the broadcast message; or, during the present period of the broadcast message, re-selecting resources for the broadcast message, and adjusting the transmission times, modulation and coding strategy or power parameters.

In the technical scheme of the embodiment of the invention, at least one of the following feedback information corresponding to the broadcast message is obtained: ACK information, NACK information; measuring at least one of the following channel parameters: the energy of the control channel, the energy of the service channel and the distance between the broadcast message receiving end and the broadcast message transmitting end; judging whether feedback of feedback information is needed on a feedback channel or not according to the feedback information and the channel parameters; and if feedback of feedback information is needed on a feedback channel, performing code modulation on the feedback information, and then performing spread spectrum mapping on a time-frequency domain to the feedback channel for transmission. Receiving feedback information on a feedback channel and decoding the feedback information, and measuring the energy of the feedback channel; judging whether the retransmission process needs to be triggered according to at least one of the following steps: the decoding result of the feedback information, the energy of the feedback channels, the number of the feedback channels and the type of the broadcast message. By adopting the technical scheme of the embodiment of the invention, the reliability of the broadcasting system and the utilization efficiency of system resources are improved.

Drawings

The drawings illustrate generally, by way of example and not by way of limitation, various embodiments discussed herein.

Fig. 1 is a flow chart of a retransmission feedback method according to an embodiment of the present invention;

fig. 2 is a flow chart of a retransmission triggering method according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a retransmission feedback device according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a retransmission trigger device according to an embodiment of the present invention;

fig. 5 is a schematic view of a scenario according to an embodiment of the present invention.

Detailed Description

For a more complete understanding of the nature and the technical content of the embodiments of the present invention, reference should be made to the following detailed description of embodiments of the invention, taken in conjunction with the accompanying drawings, which are meant to be illustrative only and not limiting of the embodiments of the invention.

The existing broadcasting system does not support the feedback technology, is generally designed in an open loop structure, has lower transmission efficiency and lower reliability, and the V2X system requires higher reliability, and the TR22.886 provides that the reliability of some scenes is required to be 99.999%, so that the improvement of the reliability and the transmission efficiency of a broadcasting mechanism becomes a research hotspot.

The invention provides a retransmission feedback and triggering method and device for a broadcasting system, referring to fig. 5, a receiving end in a broadcasting message receiving coverage feeds back on a feedback channel through a receiving end decision feedback condition, a broadcasting message sending end receives and measures energy or/and quantity on feedback channel resources, and by combining the type of sent information, parameters such as code rate, power control and the like of the next period transmission of semi-constant scheduling are triggered and adjusted or retransmission resource selection is triggered in the period, parameters such as code rate, power control and the like are adjusted, and the reliability of the broadcasting system and the utilization efficiency of system resources are improved.

In an LTE-based V2V communication system, a system uplink subframe is used as a physical link control channel (PSCCH, physical Sidelink Control Channel) subframe and a physical link shared channel (PSSCH, physical Sidelink Shared Channel) subframe for transmitting V2V control and data traffic. The transmitting UE indicates the used PSSCH resource through link control information (SCI, sidelink Control Information) in a link (i.e., a Sidelink link) control channel and transmits V2V data information on the corresponding data channel resource.

All RBs contained in each V2V resource subframe are divided into a plurality of sub-channels (sub-channels), each sub-channel contains a plurality of continuous RBs, and 2 RBs with the smallest index (index) among the RBs are taken as PSCCH resources, namely PSCCH resource pools (PSCCH resource pool) are distributed in a discrete mode on the whole in the frequency domain, and PSCCH resource pool can be understood to be embedded in PSSCH resource pool. In actual use, if the PSCCH resource in the sub-channel is not used to carry SCI, the PSCCH resource can be used as a PSCCH resource to carry V2V data (V2V data). Or PSCCH is distributed in a centralized way, PSCCH and PSSCH are independent in the same subframe resource pool, and each PSCCH corresponds to one sub channel one by one.

The technical scheme of the embodiment of the invention is also applicable to a New generation wireless communication (NR) system.

Fig. 1 is a flow chart of a retransmission feedback method according to an embodiment of the present invention, which is applied to a broadcast message receiving end, as shown in fig. 1, and the method includes the following steps:

step 101: at least one of the following feedback information corresponding to the broadcast message is obtained: ACK information, NACK information.

Step 102: measuring at least one of the following channel parameters: the energy of the control channel, the energy of the traffic channel, and the distance between the broadcast message receiving end and the broadcast message transmitting end.

Step 103: judging whether feedback of feedback information is needed on a feedback channel or not according to the feedback information and the channel parameters.

Here, a decision criterion is adopted to determine whether feedback of feedback information on a feedback channel is required; wherein the decision criteria includes at least one of:

Step 104: and if feedback of feedback information is needed on a feedback channel, performing code modulation on the feedback information, and then performing spread spectrum mapping on a time-frequency domain to the feedback channel for transmission.

Here, the spreading mapping of the feedback information on the time-frequency domain after the code modulation to the feedback channel is transmitted, including:

The step of spreading and mapping the feedback information code modulated on a time-frequency domain to a feedback channel for transmission comprises the following steps: multiplying the feedback information after code modulation by the following orthogonal sequences in the time domain: the method comprises the steps of selecting fixed orthogonal sequences, or orthogonal sequences randomly selected from an orthogonal sequence group, selecting corresponding orthogonal sequences according to PSCCH indication of a transmitting terminal UE, or selecting corresponding orthogonal sequences according to characteristics of a receiving UE. Here, the UE is characterized by, for example, a UE identity (UEID).

Fig. 2 is a flow chart of a retransmission triggering method according to an embodiment of the present invention, which is applied to a broadcast message transmitting end, as shown in fig. 2, and the method includes the following steps:

step 201: receiving and decoding feedback information on a feedback channel, and measuring energy of the feedback channel.

Step 202: judging whether the retransmission process needs to be triggered according to at least one of the following steps: the decoding result of the feedback information, the energy of the feedback channels, the number of the feedback channels and the type of the broadcast message.

Judging whether the retransmission process needs to be triggered or not by adopting a judgment criterion; wherein the decision criteria includes at least one of:

Here, the feedback channel satisfies at least one of the following configurations:

Here, the feedback channel includes at least one of: one NACK channel, a pair of ACKs, a NACK channel, a second NACK channel.

Here, the manner of the broadcast message transmitting end indication includes at least one of the following:

Here, the resource of the feedback information is indicated by at least one of the following indication means:

Here, the resource of the feedback information is a set of orthogonal code groups, where each codeword in the orthogonal code groups corresponds to a sequence number.

Here, the broadcast message is a periodic broadcast message, and the method further includes:

The technical scheme of the embodiment of the invention is further described in detail below in connection with a specific application scene.

Example 1

The location of the feedback channel resources may include the following:

1) PSCCH/PSSCH one-to-one correspondence with feedback channel

Specifically, the resources of the feedback channel are at a fixed time-frequency domain position after PSCCH/PSSCH selection.

Here, the index of the feedback channel in the feedback channel resource pool is consistent with the frequency domain starting index of the PSCCH/PSSCH, and the time domain is fixed. The feedback channel resource pool can be located at any defined position of the frequency domain and is in a frequency division mode with the PSCCH/PSSCH resource pool or a sub-channel is designated as feedback channel resource or is in a time division mode with the PSCCH/PSSCH resource pool.

2) Feedback channel information is indicated by PSCCH

The type of feedback channel is a pair of feedback channels including a positive Acknowledgement (ACK) channel resource and a Negative Acknowledgement (NACK) channel resource. Wherein the information resources of the feedback channel may be in several ways.

1) The ACK channel resources and NACK channel resources are in units of RBs (e.g., 12 15k subcarriers in the frequency domain and 14 symbols in the time domain), i.e., the ACK channel resources and NACK channel resources each occupy one RB. The location relationship between the ACK channel resources and the NACK channel resources may be time-domain adjacent or frequency-domain adjacent, or may be determined according to a fixed pattern (pattern), i.e., the time-frequency location of one feedback resource (e.g., ACK channel resource) is known, and the time-frequency location of another feedback resource (e.g., NACK channel resource) may be obtained.

2) The same RB is divided by time slots, and the ACK channel resource and the NACK channel resource occupy one time slot respectively.

3) The ACK channel resources and NACK channel resources are in units of one or several symbols and the frequency is in units of N subcarriers (e.g., subcarrier parameters may be 15k,30k,60k,120k, etc. to accommodate NR systems).

In the first embodiment, the spreading scheme of the feedback channel uses a fixed orthogonal sequence, where the fixed sequence is known to both parties.

In the second embodiment, the spreading scheme of the feedback channel uses orthogonal sequences randomly selected from the orthogonal sequence group.

In the third embodiment, the spreading manner of the feedback channel adopts an orthogonal sequence randomly selected from the orthogonal sequence group, wherein the transmitting end device obtains the counted number of receiving UEs in a limited range according to the pre-mutual hearing result.

Transmitting terminal equipment:

the first step: the resources used to transmit PSCCH/PSSCH are selected on the V2X resource pool by listening or randomly selecting or based on the configuration of the base station.

And a second step of: and transmitting PSCCH/PSSCH on the selected resource, wherein PSCCH refers to resource allocation for transmitting PSSCH and related control information.

And a third step of: feedback information is received on a feedback channel.

In the first embodiment, the transmitting end checks ACK/NACK channel energy on the feedback channel, and selects retransmission (i.e. reselecting and selecting resource retransmission or transmitting on the resource scheduled by the next SPS resource) and adjusts parameters such as modulation and coding strategy (MCS, modulation and Coding Scheme), power control, etc. according to the ratio of the reference signal received power (RSRP, reference Signal Receiving Power) of ACK and NACK and the type of transmitted information, wherein the type of transmitted information may be information such as priority information type or service type, and the parameters of ACK/NACK ratio selection retransmission and adaptive adjustment corresponding to different information types may be different ratio intervals.

In a second embodiment, the transmitting end detects ACK and NACK on the resources of the feedback channel according to the orthogonal code group sequence, counts and decodes the correct ACK number and NACK number, calculates the ACK/NACK ratio, and according to the ratio and the type of the transmission information, selects retransmission (i.e. reselecting and selecting the resources to retransmit or transmit on the resources scheduled by the next SPS resource), and adjusts parameters such as MCS and power control, wherein the orthogonal code group includes N orthogonal code sequences, and ACK and NACK are randomly selected in the same orthogonal code group.

In a third embodiment, the transmitting end detects and counts the number of correct ACKs, the number of NACKs and the number of ACKs plus NACKs in the resources of the feedback channel according to the orthogonal code group sequence, calculates the ratio of ACKs to NACKs and the number of ACKs plus NACKs, counts the number of receiving UEs in a limited range according to the mutual listening result in advance, if the ratio of the number of receiving UEs to the number of ACKs plus NACKs is greater than a predefined ratio, judges whether to retransmit according to the ratio, the ratio and the type of transmission information, and reselects the resources to retransmit or transmit on the resources scheduled by the next SPS resources if retransmitting, and adjusts parameters such as MCS, power control and the like. The limited range refers to an area with a certain distance from the transmitting end UE.

In the fourth embodiment, the transmitting end detects and counts the number of correct ACKs and/or NACKs for decoding according to the orthogonal code group sequence at the resource of the feedback channel, and counts the number of receiving UEs within a limited range according to the pre-mutually listening result. If the ratio of the number of the detected feedback NACKs to the number of the required feedback channels is larger than a preset value or the ratio of the number of the detected feedback ACKs to the number of the required feedback channels is smaller than the preset value, judging whether to retransmit or not according to the ratio, the ratio and the type of the transmitted information, if retransmitting, reselecting the resource to retransmit or transmitting on the resource scheduled by the next SPS resource, and adjusting parameters such as the transmitted MCS, power control and the like.

The retransmission and adjustment of the next SPS transmission parameters adjusts the transmission parameter range according to the importance, priority and other information of the transmission information, the ratio of the obtained ACK and NACK, or the list of the receiving UE and other parameters.

Receiving end equipment:

because of the broadcast message, a plurality of receiving devices receive the broadcast message in the coverage of the broadcast message, and a plurality of receiving design processes are consistent.

The first step: the PSCCH and RSRP of all sub-channels on the subframe are measured.

And a second step of: the receiving end user blindly detects all PSCCHs.

And a third step of: decoding the PSCCH on the indicated resources based on the decoded PSCCH information if the PSCCH decoding is correct, and selecting further processing based on the decoding result, wherein the processing includes one or any combination of the following:

the fourth step is performed if the decoding is correct,

the decoding error then performs the fifth step.

No feedback is performed.

Here, if the PSCCH decoding is wrong, the sixth step is performed.

Fourth step: based on the average value of RSPR of sub-channel occupied by PSSCH resource and the set threshold value of RSPR (the threshold value can be set to-128 dBm at minimum), when RSRP is greater than the threshold value or the measured distance is smaller than the threshold value, the correct information is fed back on the configured ACK channel resource, wherein the measured distance refers to the distance between receiving UE and transmitting UE, and the meaning is the same unless otherwise specified in the following

In the first embodiment, after the ACK information is modulated and coded, the ACK information is mapped onto ACK feedback channel resources (the codewords in the scrambling code word group are orthogonal) after being subjected to time domain and frequency domain spreading according to the fixed orthogonal codewords, where the fixed codewords can be obtained through PSCCH indexes (one-to-one correspondence with PSCCH) or obtained through PSCCH decoding, and at this time, multiple users decoding into ACK by multiple receiving users send on the same feedback resources by adopting the same code.

In the second and third embodiments, the ACK information is modulated and encoded, then orthogonal sequence codewords are selected from the orthogonal sequence group in a random manner, a plurality of users receiving the same broadcast channel decode the orthogonal sequence codewords into ACKs, the orthogonal sequence is randomly selected from the orthogonal code group, and after time-frequency domain spreading, the orthogonal sequence is mapped onto ACK feedback channel resources, that is, a plurality of users are mapped onto ACK feedback channel physical resources corresponding to the same transmitted broadcast channel through orthogonal code spreading.

Fifth step: and feeding back receiving error information on the configured NACK channel resource when the RSRP is larger than the threshold value or the sum measurement distance is smaller than the threshold value according to the average value of the RSPRs of the sub-channels occupied by the PSSCH resource and the set threshold value of the RSPR (the minimum threshold value can be set to be minus 128 dBm). In the first embodiment, NACK information is modulated and encoded, and then subjected to time domain and frequency domain spreading according to a fixed orthogonal codeword, and mapped onto NACK feedback channel resources (the codewords in a scrambling code word group are orthogonal), where the fixed codeword can be obtained through PSCCH index or obtained through PSCCH decoding, and at this time, multiple users receiving NACK decoding are transmitted on the same feedback resource by using the same code.

In the second and third embodiments, NACK information is modulated and encoded, then orthogonal sequence codewords are randomly selected from the orthogonal sequence group, a plurality of users receiving the same broadcast channel decode the NACK information into NACK, the orthogonal code sequences are randomly selected from the orthogonal code group, and the NACK information is mapped to NACK feedback channel resources corresponding to the broadcast channel for the same transmission after time-frequency domain spreading.

Sixth step: when PSCCH decoding errors or the average value of RSPR of sub-channels occupied by PSCCH resources are detected to be larger than a threshold value or the sum measurement distance is smaller than the threshold value, if a special PSCCH feedback channel exists, NACK information is modulated and coded and then is mapped onto NACK feedback channel resources (the code words in a scrambling code word group are orthogonal) after orthogonal code words are randomly selected according to a predefined code word or a scrambling code word group to carry out time domain and frequency domain spread, and the process is similar to the fifth step, or feedback is carried out on the PSSCH feedback channel according to the fifth step.

Embodiment two: informing that feedback is needed

Transmitting terminal equipment:

the first step: the PSCCH/psch resources used for transmission are selected on the V2X resource pool by listening or random selection and whether feedback is required or indicated by the PSCCH. The indication scheme is as follows:

1) 1bit indicates whether or not to feed back

One-to-one correspondence of feedback resources and PSCCH

Wherein the feedback channel resources are configured with NACK only;

wherein the feedback channel resources configure ACK and NACK resource pairs.

2) Indication method of feedback resource

For feedback sub-channels (feedback resource number=sub-channel size/RB occupied by feedback channel, the indication method is the low-frequency to high-frequency resource sequence number or the high-frequency to low-frequency resource sequence number of the feedback channel), the feedback sub-channels can be the feedback set of the previous sub-frame channels, or one sub-frame corresponds to one feedback sub-channel.

Feedback resource pools (one index for each feedback resource pair, the feedback resource pairs may be configured to be less than or equal to the number of control channels).

All available resources (one is time domain fixed and one is indication time-frequency two-dimensional)

And a second step of: and transmitting PSCCH/PSSCH on the resource selected in the step one, wherein the PSCCH transmits the resource allocation of the PSSCH and related control information. And indicates whether feedback is needed or indicates feedback resources over the PSCCH.

And a third step of: feedback information is received on feedback resources corresponding to the PSCCH indication.

If PSCCH indicates that configuration needs feedback, i.e. 1bit feedback information is indicated

And when the PSCCH configuration needs feedback, receiving the feedback on the resources corresponding to one, otherwise, the feedback is not needed to be considered.

In the first embodiment, for each PSCCH/PSSCH, a NACK and/or ACK channel resource may be corresponding, a transmitting end of the PSCCH/PSSCH may receive information on a feedback channel resource corresponding to the PSCCH/PSSCH, decode NACK and/or ACK resource information to obtain NACK information and/or ACK information, measure energy of the corresponding feedback channel or descramble one by one according to index of an orthogonal code group, and establish the number of users receiving errors and/or the number of users receiving correct reception.

The second embodiment configures one NACK resource for a plurality of transmitters to receive information on the corresponding resource, each transmitter decodes the corresponding resource according to a predefined orthogonal code sequence (signaling configuration) or an orthogonal code sequence corresponding to PSCCH/PSSCH

If the PSCCH indicates to configure the feedback resource, the sending end receives information on the feedback channel resource indicated by the PSCCH/PSSCH, and decodes NACK and or ACK resource information to obtain NACK information.

Fourth step:

for the second embodiment, when the transmitting end receives NACK on the corresponding feedback channel resource or the indicated feedback channel resource, decoding is performed to obtain NACK, that is, a user receiving the broadcast channel with a reception error, selecting retransmission is to reselect the resource or select transmission on the resource scheduled by the next SPS resource, and the transmitted MCS, power parameters and the like are adjusted.

For the first embodiment, if only NACK channel resources are configured, according to the number of NACK decoding users or the energy of the detected feedback channel, and the type of information to be transmitted, that is, the number of error users receiving their broadcast channels is greater than a predefined value, for example, a plurality of NACK users feedback on their feedback channels, the energy superposition is greater than or the number of feedback users is greater than a predefined threshold, retransmission is selected, i.e., retransmission of the selected resources is reselected or transmitted on the resources scheduled by the next SPS resources, and parameters such as MCS, power control, etc. are adjusted. I.e. the number of NACKs is greater than a predefined threshold or the energy of the NACK channel is greater than a predefined threshold, retransmission is selected.

For the first embodiment, if a pair of MACK and ACK resources are configured, according to the number of users decoding NACK and ACK or detecting the energy of the feedback channel, and the type of information transmitted, that is, the number of error users and/or the energy ratio of the number of error users and the number of correct users received by the NACK and/or the energy ratio of the error users is greater than a predefined value, if multiple NACK users feed back on their NACK feedback channels, the energy superposition of the NACK users is greater than that of multiple ACK users, and/or the number of error users receiving their broadcast channels is greater than that of multiple ACK users, retransmission, that is, reselection, selection of resource retransmission, or transmission on the resource scheduled by the next SPS resource is selected, and parameters such as MCS, power control and the like are adjusted.

Receiving end equipment:

And a second step of: the receiving end user blindly detects all PSCCHs.

And a third step of: and decoding PSSCH on the indicated resources according to the decoded PSCCH information when PSCCH decoding is correct, executing the fourth step when decoding is correct, and executing the fifth step when decoding is wrong.

Fourth step: determining whether to feed back according to the PSCCH decoding feedback domain, calculating the average value of RSPRs of sub-channels occupied by PSSCH resources and a set threshold value (the minimum threshold value can be set to be minus 128 dBm) of the RSPRs when the PSCCH indicates to feed back, feeding back to receive correct information on a preconfigured ACK resource when the RSRP is larger than the threshold value or the measured distance is smaller than the threshold value, and randomly selecting scrambling codes (orthogonal codes in a scrambling code word group) at a scrambling code word group according to a predefined scrambling or receiving end.

When the PSCCH indicates that feedback is not required, then there is no feedback procedure.

Fifth step: and feeding back the receiving error information on the pre-configured NACK resource when the RSRP is larger than the threshold value or the sum measurement distance is smaller than the threshold value according to the average value of the RSPRs of the sub-channels occupied by the PSSCH resource and the set threshold value of the RSPRs (the minimum threshold value can be set to be minus 128 dBm). The code modulated time domain and/or frequency domain are spread and mapped to the feedback resource, wherein the spreading code can be informed in the received broadcast control channel, or has one-to-one correspondence with the broadcast control channel, or is randomly selected in the spreading code sequence group.

Embodiment III: configuring NACK channel resources only

Transmitting terminal equipment:

configuring NACK channel resources

In the first embodiment, PSCCH/PSSCH channel resources correspond to one NACK channel resource, and index of an orthogonal code in an orthogonal code group may correspond to PSCCH/PSSCH one by one, or one orthogonal code may be randomly selected from the orthogonal code group; the corresponding orthogonal sequence is selected according to the PSCCH indication of the sending UE or according to the characteristics of the receiving UE such as the UEID.

In the second embodiment, a plurality of PSCCH/PSSCH channel resources are configured with one NACK channel resource, and the transmitting end indicates the sequence number of the orthogonal code sequence of the spreading code through signaling, or index of the orthogonal code in the orthogonal code group may be in one-to-one correspondence with the PSCCH/PSSCH. For example: index of the resources of the PSCCH channel coincides with index in the orthogonal code group.

In the third embodiment, PSCCH/PSSCH channel resources correspond to one NACK resource each

The index of the orthogonal code in the orthogonal code group can be in one-to-one correspondence with the PSCCH/PSSCH, or one orthogonal code can be randomly selected in the orthogonal code group.

The first step: the PSCCH/PSSCH resources used for transmission or resources configured based on the base station for transmission are selected on the V2X resource pool by listening or randomly selecting.

And a second step of: and transmitting PSCCH/PSSCH on the resource selected in the step one, wherein the PSCCH transmits the resource allocation of the PSSCH and related control information.

And a third step of: feedback information is received on feedback resources corresponding to the PSCCH/psch.

In the first embodiment, for each PSCCH/PSSCH corresponding to one NACK resource, the transmitting end receives information on the feedback channel resource corresponding to the PSCCH/PSSCH, decodes the NACK resource information to obtain NACK information, measures the energy of the corresponding feedback channel or descrambles the information one by one according to the index of the orthogonal code group, and establishes the number of error feedback UEs.

In the second embodiment, one NACK resource is configured for a plurality of transmitting ends to receive information on the corresponding resource, and each transmitting end decodes on the corresponding resource according to a predefined orthogonal code sequence (signaling configuration) or an orthogonal code sequence corresponding to PSCCH/PSSCH. Information of whether feedback errors exist or not is obtained.

In the third embodiment, each PSCCH/pscsch channel resource corresponds to a NACK resource, information is received on a PSCCH or pscsch corresponding channel, NACK resource information is decoded to obtain a PSCCH, and NACK information of the pscsch is measured or energy of its corresponding feedback channel is measured or descrambled one by one according to index of an orthogonal code group, so as to establish the number of error feedback.

Fourth step:

based on the first embodiment, the retransmission, i.e. the retransmission of the reselection selection resource or the transmission on the resource scheduled by the next SPS resource is selected according to the number of users decoding NACK or the energy of the detection feedback channel and the type of the transmitted information, and parameters such as MCS, power control and the like are adjusted. I.e. the number of NACKs is greater than a predefined threshold or the energy of the NACK channel is greater than a predefined threshold, retransmission is selected.

Based on the second embodiment, when the transmitting end receives NACK on the corresponding feedback channel resource, that is, if decoding obtains NACK, the transmitting end selects retransmission, that is, reselects the resource or selects transmission on the resource scheduled by the next SPS resource, and adjusts the MCS, power parameters, and the like of the transmission.

Based on the third embodiment, according to the number of users decoding NACK and NACK1 or detecting the energy of the feedback channel and the type of information transmitted, statistics is made on whether the PSCCH of the receiving end is received in error or whether the PSCCH is decoded in error, whether the PSCCH resource is collided is analyzed, retransmission is selected, that is, the retransmission is selected again, or the retransmission is transmitted on the resource scheduled by the next SPS resource, and parameters such as MCS and power control are adjusted. I.e. the number of NACKs is greater than a predefined threshold or the energy of the NACK channel is greater than a predefined threshold, retransmission is selected.

Receiving end equipment:

The first step: the receiving end user blindly detects all PSCCHs.

And a second step of: and if the PSCCH decoding is correct, decoding the PSSCH on the indicated resource according to the decoded PSCCH information, and performing a third step by PSSCH decoding error. And if the decoding is correct, ending the receiving process.

And a third step of: and each transmitting end corresponding to the receiving end carries out PSSCH decoding detection errors.

For the first and third embodiments, according to the measured RSRP or the measured distance from the transmitting end, or/and the information category, a NACK is fed back on the corresponding resource at the corresponding NACK resource, and the orthogonal code sequence is randomly selected to spread in a predefined manner or in a set of orthogonal resource groups, and mapped to the corresponding NACK resource. Criterion for specific feedback NACK

The RSRP is larger than or the distance between the measuring and the transmitting end is smaller than a predefined value;

predefined values according to information category and its corresponding specific RSRP and measurement;

the decoding information is verified as NACK.

For the second embodiment, a NACK resource is configured for multiple transmitting ends, a control channel of each transmitting end corresponds to a sequence number of an orthogonal code group, and NACK is spread in time-frequency domain according to the orthogonal code of the sequence number corresponding to the control channel of the transmitting end, and receiving users of multiple different transmitting ends multiplex and use different orthogonal code sequences on the same resource.

Fig. 3 is a schematic structural diagram of a retransmission feedback device according to an embodiment of the present invention, as shown in fig. 3, where the device includes:

an obtaining unit 301, configured to obtain at least one of the following feedback information corresponding to the broadcast message: ACK information, NACK information;

a measurement unit 302 for measuring at least one of the following channel parameters: the energy of the control channel, the energy of the service channel and the distance between the broadcast message receiving end and the broadcast message transmitting end;

a decision unit 303, configured to determine whether feedback of feedback information on a feedback channel is required according to the feedback information and the channel parameter;

and the sending unit 304 is configured to code-modulate the feedback information and spread-spectrum-map the feedback information on a time-frequency domain to a feedback channel for sending if feedback of the feedback information is required on the feedback channel.

In an embodiment of the present invention, the apparatus further includes:

a receiving unit 305 for receiving a control channel of the broadcast message;

a decoding and checking unit 306, configured to perform decoding and checking on the control channel; if the decoding check of the control channel is correct, decoding and checking a service channel on the resource indicated by the control channel;

the obtaining unit 301 is specifically configured to obtain at least one of the following feedback information corresponding to the broadcast message according to a decoding verification result of the traffic channel: ACK information, NACK information.

In the embodiment of the present invention, the decision unit 303 is specifically configured to: judging whether feedback information feedback is needed on a feedback channel by adopting a judgment criterion; wherein the decision criteria includes at least one of:

In an embodiment of the present invention, the apparatus further includes:

A processing unit 307, configured to code-modulate according to the feedback information, spread-spectrum-map the feedback information on a time-frequency domain, and transmit the code-modulated feedback information on a feedback channel, and multiply the code-modulated feedback information on the frequency domain by the following orthogonal sequence: fixed orthogonal sequences, orthogonal sequences randomly selected from within the set of orthogonal sequences.

In the embodiment of the present invention, the processing unit 307 is further configured to multiply the feedback information after the code modulation by the following orthogonal sequences in the time domain: fixed orthogonal sequences, or orthogonal sequences randomly selected from within a set of orthogonal sequences.

In the embodiment of the present invention, the processing unit 307 is further configured to multiply the feedback information after the code modulation by the following orthogonal sequences in the time domain: the method comprises the steps of selecting fixed orthogonal sequences, or orthogonal sequences randomly selected from an orthogonal sequence group, selecting corresponding orthogonal sequences according to PSCCH indication of a transmitting terminal UE, or selecting corresponding orthogonal sequences according to characteristics of a receiving UE.

Those skilled in the art will appreciate that the implementation functions of the units in the retransmission feedback device shown in fig. 3 can be understood with reference to the foregoing description of the retransmission feedback method.

Fig. 4 is a schematic structural diagram of a retransmission trigger device according to an embodiment of the present invention, as shown in fig. 4, where the device includes:

A receiving unit 401, configured to receive feedback information on a feedback channel and decode the feedback information;

a measuring unit 402 for measuring energy of the feedback channel;

a decision unit 403, configured to determine whether the retransmission process needs to be triggered according to at least one of: the decoding result of the feedback information, the energy of the feedback channels, the number of the feedback channels and the type of the broadcast message.

In the embodiment of the present invention, the decision unit 403 is specifically configured to: judging whether a retransmission process needs to be triggered or not by adopting a judgment criterion; wherein the decision criteria includes at least one of:

The feedback channel includes at least one of: one NACK channel, a pair of ACKs, a NACK channel, a second NACK channel.

a processing unit 404, configured to adjust the number of transmissions, modulation and coding strategy or power parameter in the next transmission period of the broadcast message; or, during the present period of the broadcast message, re-selecting resources for the broadcast message, and adjusting the transmission times, modulation and coding strategy or power parameters.

Those skilled in the art will appreciate that the implementation functions of the units in the retransmission trigger device shown in fig. 4 can be understood with reference to the foregoing description of the retransmission trigger method.

According to the technical scheme provided by the embodiment of the invention, for the equipment without a gesture recognition component (such as the equipment without a camera), a user does not need to face the equipment, the equipment can be controlled by gestures (such as selection functions, configuration parameters and the like), and the equipment per se increases the cost to be low.

It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. A retransmission feedback method, the method comprising:

at least one of the following feedback information corresponding to the broadcast message is obtained: positive acknowledgement, ACK, information, negative acknowledgement, NACK, information;

the determining whether feedback information needs to be fed back on a feedback channel includes: judging whether feedback information feedback is needed on a feedback channel by adopting a judgment criterion; wherein the decision criteria includes at least one of:

feeding back NACK information on a second NACK feedback channel if at least one of the following conditions is met: decoding and checking the control channel to be NACK information, wherein the energy of the control channel is larger than a second energy threshold value, the distance between a broadcast message receiving end and a broadcast message transmitting end is smaller than a second distance threshold value, and a second NACK feedback channel exists; if feedback of feedback information is needed on a feedback channel, the feedback information is code modulated and then spread and mapped on a time-frequency domain to the feedback channel for transmission;

The feedback channel satisfies at least one of the following configurations:

wherein the one-to-one correspondence is determined by at least one of: a pre-configuration mode, a negotiation mode and a mode for indicating a broadcast message sending end;

the feedback channel includes at least one of: one NACK channel, a pair of ACKs, a NACK channel, a second NACK channel;

the step of spreading and mapping the feedback information code modulated on a time-frequency domain to a feedback channel for transmission comprises the following steps:

multiplying the feedback information after code modulation by the following orthogonal sequences in the time domain: the method comprises the steps of selecting a fixed orthogonal sequence, or an orthogonal sequence randomly selected from an orthogonal sequence group, or selecting a corresponding orthogonal sequence according to PSCCH indication of a transmitting terminal UE, or selecting a corresponding orthogonal sequence according to characteristics of a receiving UE; the method for spreading and mapping the feedback information on the time-frequency domain after code modulation to the feedback channel for transmission further comprises the following steps:

Multiplying the feedback information after code modulation in the frequency domain by the following orthogonal sequences: a fixed orthogonal sequence or an orthogonal sequence randomly selected from the group of orthogonal sequences;

determining feedback resources according to the positions of the indicated feedback resources or according to the corresponding relation between the resources of the feedback channels and the control channels and/or the data channels of the broadcast messages;

the transmitting end selects PSCCH/PSSCH resources used for transmitting on a V2X resource pool through interception or random selection, and indicates whether feedback is needed or indicates the feedback resources through PSCCH; or selecting a resource determination for transmitting the PSCCH/PSCCH based on a configuration of the base station and indicating whether feedback is needed or indicating feedback resources over the PSCCH, including:

receiving feedback information on a feedback resource that corresponds to or is indicated by the PSCCH;

2. The method according to claim 1, wherein at least one of the following feedback information corresponding to the broadcast message is obtained: positive acknowledgement, ACK, information, negative acknowledgement, NACK, information, including:

3. A retransmission triggering method, the method comprising:

judging whether the retransmission process needs to be triggered according to at least one of the following steps: the decoding result of the feedback information, the energy of the feedback channels, the number of the feedback channels and the type of the broadcast message; the judging whether the retransmission process needs to be triggered or not comprises the following steps: judging whether a retransmission process needs to be triggered or not by adopting a judgment criterion; wherein the decision criteria includes at least one of:

if the ratio of the number of the required feedback channels to the sum of the number of NACK information and the number of ACK information in the feedback information is greater than a sixth preset value, triggering a retransmission process;

the feedback channel satisfies at least one of the following configurations:

the indication mode of the broadcast message sending end comprises at least one of the following steps:

the broadcast message sending end indicates the feedback information and the resource of the feedback information;

the resource of the feedback information is indicated by at least one of the following indication modes:

index of feedback resource adopting fixed time domain bias is used for indication, time domain is used for indication, frequency domain is used for indication, and time-frequency domain combination is used for indication;

the resource of the feedback information is a group of orthogonal code groups, wherein each code word in the orthogonal code groups corresponds to a sequence number;

determining feedback resources by determining the feedback resources according to the positions of the indicated feedback resources, or according to the corresponding relation between the resources of the feedback channels and control channels and/or data channels of broadcast messages, or selecting resources for transmitting PSCCH/PSSCH based on the configuration of the base station;

receiving feedback on one-to-one resources when the PSCCH configuration requires feedback, otherwise, the feedback is not needed to be considered _。

4. A method according to claim 3, wherein the broadcast message is a periodic broadcast message, the method further comprising:

5. A retransmission feedback device, the device comprising:

the decision unit is specifically configured to: judging whether feedback information feedback is needed on a feedback channel by adopting a judgment criterion; wherein the decision criteria includes at least one of:

feeding back NACK information on a second NACK feedback channel if at least one of the following conditions is met: decoding and checking the control channel to be NACK information, wherein the energy of the control channel is larger than a second energy threshold value, the distance between a broadcast message receiving end and a broadcast message transmitting end is smaller than a second distance threshold value, and a second NACK feedback channel exists; a sending unit, configured to code-modulate feedback information and spread-spectrum-map the feedback information on a time-frequency domain to a feedback channel for sending if feedback of the feedback information is required on the feedback channel;

the feedback channel satisfies at least one of the following configurations:

the apparatus further comprises:

a processing unit, configured to multiply the feedback information after the code modulation by the following orthogonal sequences in a time domain: the method comprises the steps of selecting a fixed orthogonal sequence, or an orthogonal sequence randomly selected from an orthogonal sequence group, or selecting a corresponding orthogonal sequence according to PSCCH indication of a transmitting terminal UE, or selecting a corresponding orthogonal sequence according to characteristics of a receiving UE;

the processing unit is further configured to code-modulate according to the feedback information, spread-spectrum-map the feedback information on a time-frequency domain to transmit the feedback information, and multiply the code-modulated feedback information on the frequency domain by the following orthogonal sequence: a fixed orthogonal sequence or an orthogonal sequence randomly selected from the group of orthogonal sequences;

6. The apparatus of claim 5, wherein the apparatus further comprises:

a receiving unit for receiving a control channel of the broadcast message;

7. A retransmission trigger device, the device comprising:

a measuring unit for measuring energy of the feedback channel;

the decision unit is used for judging whether the retransmission process needs to be triggered according to at least one of the following steps: the decoding result of the feedback information, the energy of the feedback channels, the number of the feedback channels and the type of the broadcast message;

the decision unit is specifically configured to: judging whether a retransmission process needs to be triggered or not by adopting a judgment criterion; wherein the decision criteria includes at least one of:

the feedback channel satisfies at least one of the following configurations:

wherein the one-to-one correspondence is determined by at least one of: a pre-configuration mode, a negotiation mode and a mode for indicating a broadcast message sending end; the feedback channel includes at least one of: one NACK channel, a pair of ACKs, a NACK channel, a second NACK channel;

Indication is carried out by adopting index of feedback resources with fixed time domain bias, indication is carried out by adopting time domain, indication is carried out by adopting frequency domain, and indication is carried out by adopting time-frequency domain combination;

8. The apparatus of claim 7, wherein the broadcast message is a periodic broadcast message, the apparatus further comprising: