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WO2018145502A1 - Procédé de rétroaction et de déclenchement de retransmission, dispositif et support de stockage informatique - Google Patents

Procédé de rétroaction et de déclenchement de retransmission, dispositif et support de stockage informatique Download PDF

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Publication number
WO2018145502A1
WO2018145502A1 PCT/CN2017/112878 CN2017112878W WO2018145502A1 WO 2018145502 A1 WO2018145502 A1 WO 2018145502A1 CN 2017112878 W CN2017112878 W CN 2017112878W WO 2018145502 A1 WO2018145502 A1 WO 2018145502A1
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Prior art keywords
feedback
channel
information
broadcast message
nack
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PCT/CN2017/112878
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English (en)
Chinese (zh)
Inventor
王文焕
杨瑾
黄双红
陈杰
卢有雄
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals

Definitions

  • the present application relates to the field of mobile communications, and in particular, to a retransmission feedback and triggering method and apparatus for a broadcast system, and a computer storage medium.
  • broadcast communication is usually one-to-many communication, mainly one-to-many communication of base station broadcast messages and car networking systems.
  • base station broadcast messages mainly one-to-many communication of base station broadcast messages and car networking systems.
  • car networking systems For the broadcast communication of the Internet of Vehicles system, due to the high reliability, it is necessary to further improve the reliability of the broadcast communication through feedback and retransmission.
  • the vehicle networking system refers to providing vehicle information through sensors, vehicle terminals, and electronic tags mounted on the vehicle, and adopts various communication technologies to realize V2V (Vehicle to Vehicle) and Vehicle to Person (V2P, Vehicle to Person). ), the interconnection between the vehicle and the infrastructure (V2I, Vehicle to Infrastructure), and the effective use of information extraction and sharing on the information network platform, effective control of the vehicle and provision of integrated services.
  • Vehicle networking can realize communication-based vehicle information notification and collision hazard warning.
  • State including vehicle position, speed, acceleration, driving route
  • learned road environment information collaboratively aware of road hazard conditions, timely provide a variety of collision warning information to prevent road traffic safety accidents, and become the current road traffic safety A new idea of the problem.
  • the broadcast communication mode is mainly used, and each UE separately transmits a broadcast message to be notified by itself. It is well known that the broadcast system usually cannot know the state of the receiving UE, and usually has a lower code rate and a fixed retransmission technology. To ensure the reliability of the reception, since there are many receiving devices, there are UEs that receive the correct UE, and UEs that receive the error, so the feedback cannot be effectively performed, and it is difficult to use the adaptive retransmission to improve the reliability.
  • the embodiment of the present application provides a retransmission feedback and triggering method, device, and computer storage medium.
  • the feedback information is coded and modulated and then spread-spread on the time-frequency domain to be transmitted on the feedback channel.
  • the at least one of the following feedback information corresponding to the broadcast message is obtained: the positive acknowledgement ACK information and the negative acknowledgement NACK information, including:
  • the determining whether the feedback of the feedback information needs to be performed on the feedback channel includes: determining, by using a decision criterion, whether feedback of the feedback information needs to be performed on the feedback channel; wherein the decision criterion includes at least one of the following :
  • the ACK information is fed back on the ACK feedback channel: the decoded check traffic channel is ACK information, the energy of the traffic channel is greater than the first energy threshold, and the distance between the broadcast message receiving end and the broadcast message sending end is less than First distance threshold;
  • the NACK information is fed back on the first NACK feedback channel: the decoded check traffic channel is NACK information, the energy of the traffic channel is greater than the first energy threshold, and the broadcast message receiving end and the broadcast message sending end The distance is less than the first distance threshold;
  • the NACK information is fed back on the second NACK feedback channel: the decoding check control channel is NACK information, the energy of the control channel is greater than the second energy threshold, and the broadcast message receiving end and the broadcast message sending end The distance is less than the second distance threshold and there is a second NACK feedback channel.
  • the feedback information is coded and modulated, and then spread-spread on the time-frequency domain to be sent to the feedback channel, where:
  • the coded modulated feedback information is multiplied in the frequency domain by the following orthogonal sequence: a fixed orthogonal sequence, or an orthogonal sequence randomly selected from within the orthogonal sequence group.
  • the feedback information is coded and modulated, and then spread-spread on the time-frequency domain to be sent to the feedback channel, where:
  • Multiplying the coded modulated feedback information by the following orthogonal sequence in the time domain a fixed orthogonal sequence, or an orthogonal sequence randomly selected from within the orthogonal sequence group, or selecting a corresponding orthogonal according to a PSCCH indication of the transmitting UE
  • the sequence, or the corresponding orthogonal sequence is selected according to the characteristics of the receiving UE.
  • Determining whether a retransmission process needs to be triggered according to at least one of the following: a decoding result of the feedback information, an energy of the feedback channel, a quantity of the feedback channel, and a type of a broadcast message.
  • the determining whether the retransmission process needs to be triggered includes: determining, by using a decision criterion, whether a retransmission process needs to be triggered; wherein the decision criterion includes at least one of the following:
  • the retransmission process is triggered.
  • 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;
  • control channel and/or the data channel of the plurality of broadcast messages correspond to a resource of the NACK information, and the codeword used by the feedback information has a one-to-one correspondence with the control channel and/or the data channel of the broadcast message;
  • the one-to-one correspondence is determined by at least one of the following manners: a pre-configuration mode, a negotiation mode, and a manner indicated by a broadcast message sending end.
  • the feedback channel includes at least one of: a NACK channel, a pair of ACKs, a NACK channel, a pair of ACKs, a NACK channel, and a second NACK channel.
  • the manner indicated by the sending end of the broadcast message includes at least one of the following:
  • the broadcast message sending end indicates whether it is required to perform feedback on the resources of the one-to-one corresponding feedback information
  • the broadcast message sender indicates the resources of the feedback information and the feedback information.
  • the resource of the feedback information is indicated by at least one of the following indication manners:
  • the index index of the feedback resource with fixed time domain offset is used for indication, the time domain is used for indication, the frequency domain is used for indication, and the time-frequency domain combination is used for indication.
  • the resource of the feedback information is a set of orthogonal code groups, where each codeword in the orthogonal code group corresponds to a sequence number.
  • the broadcast message is a periodic broadcast message
  • the method further includes:
  • resources are re-selected for the broadcast message, and the number of transmissions, modulation and coding strategies, or power parameters are adjusted.
  • An obtaining unit configured to obtain at least one of the following feedback information corresponding to the broadcast message: ACK information, NACK information;
  • a measuring unit configured to measure at least one of the following channel parameters: energy of the control channel, energy of the traffic channel, distance between the broadcast message receiving end and the broadcast message sending end;
  • a decision unit configured to determine, according to the feedback information, the channel parameter, whether feedback of feedback information needs to be performed on a feedback channel
  • the sending unit is configured to: if feedback of the feedback information needs to be performed on the feedback channel, the feedback information is coded and modulated and then spread-spread on the time-frequency domain and transmitted to the feedback channel for transmission.
  • the device further includes:
  • a receiving unit configured to receive a control channel of a broadcast message
  • a decoding check unit configured to perform decoding check on the control channel; if the decoding of the control channel is correctly verified, decoding a check traffic channel on a resource indicated by the control channel;
  • the acquiring unit is configured to obtain at least one of the following feedback information corresponding to the broadcast message according to the decoding and verification result of the traffic channel: ACK information and NACK information.
  • the determining unit is configured to determine, by using a decision criterion, whether feedback of feedback information needs to be performed on a feedback channel, where the decision criterion includes at least one of the following:
  • the ACK information is fed back on the ACK feedback channel: the decoded check traffic channel is ACK information, the energy of the traffic channel is greater than the first energy threshold, and the distance between the broadcast message receiving end and the broadcast message sending end is less than First distance threshold;
  • the NACK information is fed back on the first NACK feedback channel: the decoded check traffic channel is NACK information, the energy of the traffic channel is greater than the first energy threshold, and the broadcast message receiving end and the broadcast message sending end The distance is less than the first distance threshold;
  • the NACK information is fed back on the second NACK feedback channel: the decoding check control channel is NACK information, the energy of the control channel is greater than the second energy threshold, and the broadcast message receiving end and the broadcast message sending end The distance is less than the second distance threshold and there is a second NACK feedback channel.
  • the device further includes:
  • the processing unit is configured to perform coded modulation on the time-frequency domain according to the feedback information and transmit to the feedback channel, and multiply the coded and modulated feedback information in the frequency domain by the following orthogonal sequence: a fixed orthogonal sequence, Or orthogonal sequences randomly selected from within the orthogonal sequence set.
  • the processing unit is configured to multiply the coded and modulated feedback information in the time domain by the following orthogonal sequence: a fixed orthogonal sequence, or randomly selected from the orthogonal sequence group.
  • the orthogonal sequence, or the corresponding orthogonal sequence is selected according to the PSCCH indication of the transmitting UE, or the corresponding orthogonal sequence is selected according to the characteristics of the receiving UE.
  • a receiving unit configured to receive feedback information on a feedback channel and decode the feedback information
  • a measuring unit configured to measure energy of the feedback channel
  • the decision unit is configured to determine whether a retransmission process needs to be triggered according to at least one of: a decoding result of the feedback information, an energy of the feedback channel, a quantity of the feedback channel, and a type of a broadcast message.
  • the determining unit is configured to determine, by using a decision criterion, whether a retransmission process needs to be triggered, where the decision criterion includes at least one of the following:
  • the retransmission process is triggered.
  • 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;
  • control channel and/or the data channel of the plurality of broadcast messages correspond to a resource of the NACK information, and the codeword used by the feedback information has a one-to-one correspondence with the control channel and/or the data channel of the broadcast message;
  • the one-to-one correspondence is determined by at least one of the following manners: a pre-configuration mode, a negotiation mode, and a manner indicated by a broadcast message sending end.
  • the feedback channel includes at least one of: a NACK channel, a pair of ACKs, a NACK channel, a pair of ACKs, a NACK channel, and a second NACK channel.
  • the manner indicated by the sending end of the broadcast message includes at least one of the following:
  • the broadcast message sending end indicates whether it is required to perform feedback on the resources of the one-to-one corresponding feedback information
  • the broadcast message sender indicates the resources of the feedback information and the feedback information.
  • the resource of the feedback information is indicated by at least one of the following indication manners:
  • the index of the feedback resource with fixed time domain offset is used for indication, the time domain is used for indication, the frequency domain is used for indication, and the time-frequency domain combination is used for indication.
  • the resource of the feedback information is a set of orthogonal code groups, where each codeword in the orthogonal code group corresponds to a sequence number.
  • the broadcast message is a periodic broadcast message
  • the device further includes:
  • the processing unit is configured to adjust the number of transmissions, the modulation and coding strategy, or the power parameter in the next transmission period of the broadcast message; or, in the current period of the broadcast message, re-select resources for the broadcast message, adjust the number of transmissions, modulation, and coding strategy Or power parameters.
  • the embodiment of the present application further provides a computer storage medium storing a computer program configured to execute the above-mentioned retransmission feedback method or retransmission trigger method.
  • At least one of the following feedback information corresponding to the broadcast message is obtained: ACK information, NACK information; and at least one of the following channel parameters is measured: a control signal The energy of the channel, the energy of the traffic channel, the distance between the broadcast message receiving end and the broadcast message sending end; determining whether feedback of the feedback information needs to be performed on the feedback channel according to the feedback information and the channel parameter; if needed on the feedback channel After the feedback of the feedback information is performed, the feedback information is coded and modulated, and then spread-spread on the time-frequency domain and transmitted to the feedback channel for transmission.
  • FIG. 1 is a schematic flowchart diagram of a retransmission feedback method according to an embodiment of the present application
  • FIG. 2 is a schematic flowchart of a retransmission triggering method according to an embodiment of the present application
  • FIG. 3 is a schematic structural diagram of a retransmission feedback apparatus according to an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a retransmission triggering device according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a scenario according to an embodiment of the present application.
  • the existing broadcast system does not support feedback technology, usually designed in an open-loop structure, with low transmission efficiency and low reliability, while the V2X system requires high reliability.
  • TR22.886 proposes that the reliability requirements of some scenarios are 99.999%. Therefore, improving the reliability and transmission efficiency of the broadcasting mechanism has become a research hotspot.
  • the present application provides a retransmission feedback and triggering method and apparatus for a broadcast system, and a reference is made to 5, the feedback feedback condition of the receiving end in the broadcast message receiving coverage is fed back on the feedback channel, and the broadcast message transmitting end receives and measures the energy or/and the quantity on the feedback channel resource, and triggers the adjustment semi-constant according to the type of the transmitted information.
  • the coding rate, power control and other parameters transmitted in the next cycle of the scheduling may trigger the selection of retransmission resources in the current period, adjust the coding rate, power control and other parameters, and improve the reliability of the broadcasting system and the utilization efficiency of the system resources.
  • the system uplink subframe is used as a Physical Link Control Channel (PSCCH) subframe and a Physical Sidelink Shared Channel (PSSCH) subframe for transmitting V2V. Control and data services.
  • the transmitting UE indicates the used PSSCH resource through link control information (SCI, Sidelink Control Information) in the link (ie, Sidelink link) control channel, and transmits V2V data information on the corresponding data channel resource.
  • SCI link control information
  • Sidelink Control Information Sidelink Control Information
  • Each RBs included in each V2V resource sub-frame is divided into a plurality of sub-channels, each sub-channel includes a plurality of consecutive RBs, and the two RBs with the smallest index in the RBs are used as PSCCH resources. That is, the PSCCH resource pool is discretely distributed in the frequency domain as a whole, and it can also be understood that the PSCCH resource pool is embedded in the PSSCH resource pool.
  • the PSCCH resource in the sub-channel is not used to carry the SCI, it can be used as a PSSCH resource and carry V2V data (V2V data).
  • the PSCCH is distributed in a centralized manner, and the PSCCH and the PSSCH are independent in the same subframe resource pool, and each PSCCH has a one-to-one correspondence with a sub channel.
  • the technical solutions of the embodiments of the present application are also applicable to a new generation wireless communication (NR, New Radio) system.
  • NR New Radio
  • FIG. 1 is a schematic flowchart of a retransmission feedback method according to an embodiment of the present disclosure, which is applied to a broadcast message receiving end, as shown in FIG. 1 , the method includes the following steps:
  • Step 101 Obtain at least one of the following feedback information corresponding to the broadcast message: ACK information, NACK information.
  • the at least one of the following feedback information corresponding to the broadcast message is obtained: the positive acknowledgement ACK information and the negative acknowledgement NACK information, including:
  • Step 102 Measure at least one of the following channel parameters: energy of the control channel, energy of the traffic channel, distance between the broadcast message receiving end and the broadcast message sending end.
  • Step 103 Determine, according to the feedback information and the channel parameter, whether feedback of feedback information needs to be performed on a feedback channel.
  • the decision criterion is used to determine whether feedback of the feedback information needs to be performed on the feedback channel; wherein the decision criterion includes at least one of the following:
  • the ACK information is fed back on the ACK feedback channel: the decoded check traffic channel is ACK information, the energy of the traffic channel is greater than the first energy threshold, and the distance between the broadcast message receiving end and the broadcast message sending end is less than First distance threshold;
  • the NACK information is fed back on the first NACK feedback channel: the decoded check traffic channel is NACK information, the energy of the traffic channel is greater than the first energy threshold, and the broadcast message receiving end and the broadcast message sending end The distance is less than the first distance threshold;
  • the NACK information is fed back on the second NACK feedback channel: the decoding check control channel is NACK information, the energy of the control channel is greater than the second energy threshold, and the broadcast message receiving end and the broadcast message sending end The distance is less than the second distance threshold and there is a second NACK feedback channel.
  • Step 104 If feedback of the feedback information needs to be performed on the feedback channel, the feedback information is code-modulated and then spread-spread on the time-frequency domain to be transmitted on the feedback channel.
  • the coding information is coded and modulated and then spread-spread on the time-frequency domain to be transmitted on the feedback channel, including:
  • the coded modulated feedback information is multiplied in the frequency domain by the following orthogonal sequence: a fixed orthogonal sequence, or an orthogonal sequence randomly selected from within the orthogonal sequence group.
  • the method includes: multiplying the coded and modulated feedback information in the time domain by the following orthogonal sequence: a fixed orthogonal sequence, or The orthogonal sequence randomly selected from the orthogonal sequence group, or the corresponding orthogonal sequence is selected according to the PSCCH indication of the transmitting UE, or the corresponding orthogonal sequence is selected according to the characteristics of the receiving UE.
  • the feature of the UE is, for example, a UE identity (UEID).
  • FIG. 2 is a schematic flowchart of a retransmission triggering method according to an embodiment of the present disclosure, which is applied to a broadcast message sending end, as shown in FIG. 2, the method includes the following steps:
  • Step 201 Receive feedback information on the feedback channel and decode the feedback information, and measure energy of the feedback channel.
  • Step 202 Determine whether a retransmission process needs to be triggered according to at least one of the following: a decoding result of the feedback information, an energy of the feedback channel, a quantity of the feedback channel, and a type of a broadcast message.
  • the decision criterion is used to determine whether a retransmission process needs to be triggered; wherein the decision criterion includes at least one of the following:
  • the retransmission process is triggered.
  • 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;
  • control channel and/or the data channel of the plurality of broadcast messages correspond to a resource of the NACK information, and the codeword used by the feedback information has a one-to-one correspondence with the control channel and/or the data channel of the broadcast message;
  • the one-to-one correspondence is determined by at least one of the following manners: a pre-configuration mode, a negotiation mode, and a manner indicated by a broadcast message sending end.
  • the feedback channel includes at least one of: a NACK channel, a pair of ACKs, a NACK channel, a pair of ACKs, a NACK channel, and a second NACK channel.
  • the manner indicated by the broadcast message sending end includes at least one of the following:
  • the broadcast message sending end indicates whether it is required to perform feedback on the resources of the one-to-one corresponding feedback information
  • the broadcast message sender indicates the resources of the feedback information and the feedback information.
  • the resource of the feedback information is indicated by at least one of the following indication manners:
  • the index index of the feedback resource with fixed time domain offset is used for indication, the time domain is used for indication, the frequency domain is used for indication, and the time-frequency domain combination is used for indication.
  • the resource of the feedback information is a set of orthogonal code groups, wherein each codeword in the orthogonal code group corresponds to a sequence number.
  • the broadcast message is a periodic broadcast message
  • the method further includes:
  • Rate parameter Adjust the number of transmissions, modulation and coding strategies, or work during the next transmission cycle of the broadcast message.
  • resources are re-selected for the broadcast message, and the number of transmissions, modulation and coding strategies, or power parameters are adjusted.
  • the location of the feedback channel resource can include the following:
  • the resources of the feedback channel are fixed time-frequency domain locations after PSCCH/PSSCH selection.
  • the index of the feedback channel in the feedback channel resource pool is consistent with the frequency domain start index of the PSCCH/PSSCH, and the time domain is fixed.
  • the feedback channel resource pool may be located at any defined location in the frequency domain and the PSCCH/PSSCH resource pool frequency division manner or specify a subchannel as a feedback channel resource, or a PSCCH/PSSCH resource pool time division manner.
  • the type of feedback channel is a pair of feedback channels, including positive acknowledgment (ACK) channel resources and negative acknowledgment (NACK) channel resources.
  • ACK positive acknowledgment
  • NACK negative acknowledgment
  • the information resources of the feedback channel may be in the following manners.
  • the ACK channel resource and the NACK channel resource are in units of RBs (for example, 12 15k subcarriers are included in the frequency domain, and 14 symbols are included in the time domain), that is, the ACK channel resource and the NACK channel resource each occupy one RB.
  • the positional relationship between the ACK channel resource and the NACK channel resource may be adjacent to the time domain or adjacent to the frequency domain, or determined by a fixed pattern, that is, the time-frequency position of a feedback resource (such as an ACK channel resource) is known.
  • the time-frequency location of another feedback resource such as a NACK channel resource.
  • the same RB is divided by time slots, and ACK channel resources and NACK channel resources are each occupied. Time slots.
  • the ACK channel resource and the NACK channel resource are in units of one or several symbols, and the frequency is in units of N subcarriers (for example, the subcarrier parameters may be 15k, 30k, 60k, 120k, etc. to adapt to the NR system).
  • the spreading mode of the feedback channel adopts a fixed orthogonal sequence, wherein the fixed sequence is known to both parties.
  • the spreading scheme of the feedback channel employs an orthogonal sequence randomly selected from within the orthogonal sequence group.
  • the spreading mode of the feedback channel adopts an orthogonal sequence randomly selected from the orthogonal sequence group, wherein the transmitting end device obtains the statistics of the number of receiving UEs within a limited range according to the pre-interleaving result.
  • Step 1 Select a resource for transmitting PSCCH/PSSCH by listening or random selection on the V2X resource pool, or select a resource for transmitting PSCCH/PSSCH based on the configuration of the base station.
  • the second step transmitting PSCCH/PSSCH on the selected resource, where PSCCH refers to resource allocation and related control information for transmitting the PSSCH.
  • the third step receiving feedback information on the feedback channel.
  • the transmitting end checks the ACK/NACK channel energy on the feedback channel, and selects retransmission according to the ratio of the reference signal received power (RSRP, Reference Signal Receiving Power) of the ACK and the NACK, and the type of the transmitted information. Selecting a resource retransmission or sending on a resource scheduled by the next SPS resource, and adjusting parameters such as a modulation and coding scheme (MCS), power control, and the like, wherein the type of the transmission information may be priority information.
  • MCS modulation and coding scheme
  • Information such as type or service type, ACK/NACK ratio corresponding to different information types, and parameters for retransmission and adaptive adjustment may be different ratio intervals.
  • the transmitting end detects the ACK in the orthogonal code group sequence on the resource of the feedback channel, and ACKs and NACKs on the NACK resource, and statistically decodes the correct number of ACKs, the number of NACKs, calculates the ACK/NACK ratio, and according to the ratio and the transmission.
  • Type of information select retransmission (ie, reselect to select resource retransmission or send on the resource of the next SPS resource scheduling) and adjust parameters such as MCS, power control, etc., where the orthogonal code group contains N orthogonal code sequences, ACK The NACK is randomly selected in the same orthogonal code group.
  • the transmitting end detects and statistically decodes the correct number of ACKs, the number of NACKs, calculates the ACK/NACK ratio, and the number of ACKs and NACKs in the resources of the feedback channel according to the orthogonal code group sequence, according to the statistics of the pre-interference results.
  • the number of receiving UEs in a limited range such as the ratio of the number of receiving UEs to the number of ACKs plus NACKs, is greater than a predefined ratio.
  • the ratio and the type of sending information it is determined whether to retransmit, and if retransmission, the resource retransmission is reselected or under An SPS resource is scheduled to be transmitted on the resource, and parameters such as the transmitted MCS and power control are adjusted.
  • the limited range refers to an area that is a certain distance from the transmitting end UE.
  • the transmitting end detects and statistically decodes the correct number of ACKs and/or the number of NACKs in the orthogonal code group sequence in the resources of the feedback channel, and counts the number of receiving UEs within a limited range according to the pre-interesting result.
  • the ratio of the number of detected feedback NACKs to the number of required feedback channels is greater than a predetermined value, or the ratio of the number of detected feedback ACKs to the number of required feedback channels is less than a predetermined value, whether to retransmit according to the ratio, the ratio, and the type of the transmitted information If retransmission, reselect the resource retransmission or send on the resource scheduled by the next SPS resource, and adjust the parameters of the transmitted MCS, power control, and the like.
  • the retransmission and the adjustment of the next SPS transmission parameter adjust the transmission parameter range according to the importance of the information to be transmitted, the priority and the like, the obtained ratio of the ACK, the NACK, and the parameter of the receiving UE.
  • Step 1 Measure the PSCCH and the RSRP of all subchannels on the subframe.
  • Step 2 The receiving end user blindly checks all PSCCHs.
  • the third step the PSCCH decoding is correct, the PSSCH is decoded on the indicated resource according to the decoded PSCCH information, and further processing is selected according to the decoding result, wherein the processing includes one or any combination of the following processes:
  • the decoding error is performed in the fifth step.
  • the sixth step is performed.
  • Step 4 According to the average value of the RSPR of the subchannel occupied by the PSSCH resource and the set threshold of the RSPR (the threshold value may be set to -128 dBm), when the RSRP is greater than the threshold or the measurement distance is less than When the threshold value is received, the correct information is fed back on the configured ACK channel resource, where the measured distance refers to the distance between the receiving UE and the transmitting UE, and the meaning is the same unless otherwise specified.
  • the threshold value may be set to -128 dBm
  • the ACK information is modulated and coded, and then spread in a time domain frequency domain according to a fixed orthogonal codeword, and then mapped to an ACK feedback channel resource (the codeword orthogonal in the scrambling codeword group), where
  • the fixed codewords can be obtained through the PSCCH index (one-to-one correspondence with the PSCCH), or obtained by PSCCH decoding.
  • users who are decoded by the multiple receiving users into ACKs are transmitted on the same feedback resource by using the same code.
  • the ACK information is modulated and encoded, and the orthogonal sequence codeword is selected from the orthogonal sequence group in a random manner, and the plurality of users receiving the same broadcast channel are decoded into ACK, in the orthogonal code group.
  • the orthogonal code sequence is randomly selected and then spread in the time-frequency domain and then mapped to the ACK feedback channel resource, that is, multiple users are mapped by the orthogonal code to the physical resources of the ACK feedback channel corresponding to the same transmitted broadcast channel. .
  • Step 5 According to the average value of the RSPR of the subchannel occupied by the PSSCH resource and the set threshold of the RSPR (the threshold value can be set to -128 dBm minimum), when the RSRP is greater than the threshold or the measurement distance is less than The threshold error is received on the configured NACK channel resource.
  • the NACK information is modulated and encoded, and then spread in a time domain frequency domain according to a fixed orthogonal codeword, and then mapped to a NACK feedback channel resource (the codeword orthogonal in the scrambling codeword group), where The fixed codeword can be obtained through the PSCCH index or obtained by PSCCH decoding. At this time, users who are decoded by the multiple receiving users into NACKs are sent on the same feedback resource by using the same code.
  • the NACK information is modulated and encoded, and the orthogonal sequence codeword is selected from the orthogonal sequence group in a random manner, and the plurality of users receiving the same broadcast channel are decoded into NACK, and are randomly selected in the orthogonal code group.
  • the orthogonal code sequence is selected, and the time-frequency domain is spread, and then mapped to the NACK feedback channel resource corresponding to the same transmitted broadcast channel.
  • Step 6 When the PSCCH decoding error or the average value of the RSPR of the subchannel occupied by the PSCCH resource is greater than the threshold or the measurement distance is less than the threshold, if there is a dedicated PSCCH feedback channel, the NACK information is modulated and encoded. Defining a codeword or randomly selecting an orthogonal codeword in a scrambling codeword block for time domain frequency domain spreading, and mapping to a NACK feedback channel resource (the codeword orthogonal in the scrambling codeword group), the process and the fifth The steps are similar, or feedback is performed in the fifth step on the feedback channel of the PSSCH.
  • Embodiment 2 Notification requires feedback
  • Step 1 Select the PSCCH/PSSCH resource for transmission by listening or randomly selecting on the V2X resource pool, and indicate whether the feedback resource needs to be fed back or indicated through the PSCCH.
  • the indication scheme is as follows:
  • the feedback channel resource is only configured with a NACK
  • the feedback channel resource configures an ACK and a NACK resource pair.
  • the sub-frame channel feedback set may also be one sub-frame corresponding to one feedback sub-channel).
  • Feedback resource pool (each feedback resource pair corresponds to one index, and the feedback resource pair can be configured to be less than or equal to the number of control channels).
  • Step 2 Send PSCCH/PSSCH on the resource selected in step 1.
  • the PSCCH sends the PSSCH resource allocation and related control information. And through the PSCCH to indicate whether feedback or indication feedback resources are needed.
  • the third step receiving feedback information on the feedback resource indicated or corresponding to the PSCCH.
  • the PSCCH indicates that the configuration requires feedback, it indicates 1 bit feedback information.
  • the first embodiment may correspond to one NACK and or ACK channel resource for each PSCCH/PSSCH, and the transmitting end receives information on the feedback channel resource corresponding to the PSCCH/PSSCH, and decodes the NACK and or ACK resource information to obtain NACK information and or ACK information.
  • the energy of the corresponding feedback channel is measured or descrambled one by one according to the index of the orthogonal code group, and the number of users receiving the error and the number of receiving the correct receiving users are established.
  • the second embodiment configures one NACK resource for multiple senders to receive information on the corresponding resource, and each sender performs a predefined orthogonal code sequence (signaling configuration) or an orthogonal code sequence corresponding to the PSCCH/PSSCH. Decode on the corresponding resource
  • the ACK resource information obtains NACK information.
  • the transmitting end when the transmitting end receives the NACK on the corresponding feedback channel resource or the indicated feedback channel resource, the user obtains the NACK by decoding, that is, receives the user whose receiving channel has the receiving error, and selects retransmission to restart. Select the resource or select the transmission on the resource scheduled by the next SPS resource, and adjust the transmitted MCS, power parameters, and so on.
  • the number of users decoding the NACK or the energy of the feedback feedback channel, and the type of information transmitted that is, the number of users receiving their broadcast channel errors is greater than a predefined value, such as The NACK users feed back on their feedback channels, whose energy superposition is greater than or the number of feedback users is greater than a predefined threshold.
  • ACK resources are configured, according to the decoded NACK, the number of users of the ACK or the energy of the feedback feedback channel, and the type of information transmitted, that is, the number and or energy of users who receive their broadcast channel errors.
  • the number of correct users and the energy ratio are greater than a predefined value, such as multiple NACK users feeding back on their NACK feedback channel, whose energy superposition is greater than the energy superposition of multiple ACK users, and the number of users receiving their broadcast channel errors If the number of ACK users is greater than the number of ACKs, the reselection, that is, reselection, the resource retransmission is selected or sent on the resource scheduled by the next SPS resource, and the parameters of the transmitted MCS, power control, and the like are adjusted.
  • Step 1 Measure the PSCCH and the RSRP of all subchannels on the subframe.
  • Step 2 The receiving end user blindly checks all PSCCHs.
  • Step 3 If the PSCCH decoding is correct, the PSSCH is decoded on the indicated resource according to the decoded PSCCH information. If the decoding is correct, the fourth step is performed, and the decoding error is performed in the fifth step.
  • the fourth step determining whether to feedback according to the PSCCH decoding feedback field, calculating the average value of the RSPR of the subchannel occupied by the PSSCH resource and the threshold of the set RSPR when the PSCCH indicates the feedback (the minimum threshold value may be set to - 128dBm), when the RSRP is greater than the threshold or the measured distance is less than the threshold, the correct information is fed back on the pre-configured ACK resource, and the scrambling code word is randomly selected in the scrambling codeword group according to the predefined scrambling or receiving end.
  • the codewords within the scrambling block are orthogonal.
  • Step 5 According to the average value of the RSPR of the subchannel occupied by the PSSCH resource and the set threshold of the RSPR (the threshold value can be set to -128 dBm minimum), when the RSRP is greater than the threshold or the measurement distance is less than
  • the threshold information is fed back to the pre-configured NACK resource to receive error information.
  • the coded modulated time domain and or the frequency domain spread spectrum are mapped to the feedback resources, wherein the spread code can be notified on the received broadcast control channel, or have a one-to-one correspondence with the broadcast control channel, or in the spread code sequence. Random selection within the group.
  • Embodiment 3 Configuring only NACK channel resources
  • the PSCCH/PSSCH channel resource corresponds to one NACK channel resource
  • the index of the orthogonal code in the orthogonal code group may be in one-to-one correspondence with the PSCCH/PSSCH, or one orthogonality is randomly selected in the orthogonal code group. And selecting a corresponding orthogonal sequence according to the PSCCH indication of the transmitting UE or according to the characteristics of the receiving UE, such as the UEID.
  • a plurality of PSCCH/PSSCH channel resources are configured with one NACK channel resource, and the transmitting end indicates the orthogonal code sequence number of the spreading code by signaling, or the index of the orthogonal code in the orthogonal code group may be One-to-one correspondence with PSCCH/PSSCH.
  • the index of the resource of the PSCCH channel is consistent with the index in the orthogonal code group.
  • the PSCCH/PSSCH channel resources respectively correspond to one NACK resource.
  • the index of the orthogonal code in the orthogonal code group may be in one-to-one correspondence with the PSCCH/PSSCH, or one orthogonal code may be randomly selected in the orthogonal code group.
  • Step 1 Select a PSCCH/PSSCH resource for transmission or a resource for transmitting PSCCH/PSSCH based on the configuration of the base station by listening or randomly selecting on the V2X resource pool.
  • Step 2 Send PSCCH/PSSCH on the resource selected in step 1.
  • the PSCCH sends the PSSCH resource allocation and related control information.
  • the third step receiving feedback information on the feedback resource corresponding to the PSCCH/PSSCH.
  • the transmitting end receives information on the feedback channel resource corresponding to the PSCCH/PSSCH, decodes the NACK resource information, obtains NACK information, or measures the energy of the corresponding feedback channel or orthogonally.
  • the index of the code group is descrambled one by one, and the number of error feedback UEs is established.
  • Embodiment 2 configuring a NACK resource for multiple senders to receive information on a corresponding resource, and each sender performs a predefined orthogonal code sequence (signaling configuration) or an orthogonal code sequence corresponding to PSCCH/PSSCH. Decode on the corresponding resource. Get information on whether there is a feedback error.
  • the PSCCH/PSSCH channel resources respectively correspond to one NACK resource, receive information on the channel corresponding to the PSCCH and the PSSCH, decode the NACK resource information, obtain the PSCCH, and the NACK information of the PSSCH or measure the energy of the corresponding feedback channel or orthogonally.
  • the index of the code group is descrambled one by one, establishing the number of error feedbacks.
  • the retransmission that is, the reselection, the resource retransmission is selected or transmitted on the resource of the next SPS resource scheduling, and the transmitted MCS is adjusted.
  • Control parameters That is, if 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.
  • the transmitting end selects the retransmission, that is, re-selects the resource, selects the transmission on the resource scheduled by the next SPS resource, and adjusts the sent MCS. Power parameters, etc.
  • Embodiment 3 Based on Embodiment 3, according to the number of users decoding NACK and NACK1 or the energy of the feedback feedback channel, and the type of information to be transmitted, whether the reception is a PSCCH reception error or a PSSCH decoding error, and whether the PSCCH resource collision is selected, and the retransmission is selected.
  • the reselection selects the resource to be retransmitted or sent on the resource scheduled by the next SPS resource, and adjusts the parameters of the transmitted MCS, power control, and the like. That is, if 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.
  • the first step the receiving end user blindly checks all PSCCHs.
  • Step 2 If the PSCCH decoding is correct, the PSSCH is decoded on the indicated resource according to the decoded PSCCH information, and the PSSCH decoding error is performed in the third step. If the decoding is correct, the receiving process ends.
  • the third step each sender corresponding to the receiving end performs a PSSCH decoding detection error.
  • the NACK is fed back to the corresponding resource on the corresponding resource, in a predefined manner or in a set of orthogonal resources.
  • the orthogonal code sequence is randomly selected and spread, and mapped to the corresponding NACK resource.
  • the RSRP is greater than or the distance between the measurement and the transmitting end is less than a predefined value
  • the decoding information is verified as NACK.
  • a NACK resource is configured for multiple senders, and the control channel of each sender corresponds to a sequence number of an orthogonal code group, and the sequence number corresponding to the control channel of the sender is positive.
  • the cross-code performs frequency-frequency domain spreading on the NACK, and the receiving users of different different transmitting ends use different orthogonal code sequences on the same resource.
  • FIG. 3 is a schematic structural diagram of a retransmission feedback apparatus according to an embodiment of the present application. As shown in FIG. 3, the apparatus includes:
  • the obtaining unit 301 is configured to obtain at least one of the following feedback information corresponding to the broadcast message: ACK information, NACK information;
  • the measuring unit 302 is configured to measure at least one of the following channel parameters: energy of the control channel, energy of the traffic channel, distance between the broadcast message receiving end and the broadcast message sending end;
  • the determining unit 303 is configured to determine, according to the feedback information and the channel parameter, whether feedback of feedback information needs to be performed on the feedback channel;
  • the sending unit 304 is configured to: if feedback of the feedback information needs to be performed on the feedback channel, the feedback information is coded and modulated, and then spread-spread on the time-frequency domain to be transmitted on the feedback channel.
  • the device further includes:
  • the receiving unit 305 is configured to receive a control channel of the broadcast message
  • the decoding check unit 306 is configured to perform decoding and verification on the control channel; if the decoding of the control channel is correctly verified, decoding the verification service channel on the resource indicated by the control channel;
  • the obtaining unit 301 is configured to obtain at least one of the following feedback information corresponding to the broadcast message according to the decoding and verification result of the traffic channel: ACK information and NACK information.
  • the determining unit 303 is configured to determine, by using a decision criterion, whether feedback of the feedback information needs to be performed on the feedback channel, where the decision criterion includes at least one of the following:
  • the ACK information is fed back on the ACK feedback channel: the decoded check traffic channel is ACK information, the energy of the traffic channel is greater than the first energy threshold, and the distance between the broadcast message receiving end and the broadcast message sending end is less than First distance threshold;
  • the NACK information is fed back on the first NACK feedback channel: the decoded check traffic channel is NACK information, the energy of the traffic channel is greater than the first energy threshold, and the broadcast message receiving end and the broadcast message sending end The distance is less than the first distance threshold;
  • the NACK information is fed back on the second NACK feedback channel: the decoding check control channel is NACK information, the energy of the control channel is greater than the second energy threshold, and the broadcast message receiving end and the broadcast message sending end The distance is less than the second distance threshold and there is a second NACK feedback channel.
  • the device further includes:
  • the processing unit 307 is configured to perform coded modulation on the time-frequency domain according to the feedback information and transmit to the feedback channel, and multiply the coded and modulated feedback information in the frequency domain by the following orthogonal sequence: a fixed orthogonal sequence. Orthogonal sequences randomly selected from orthogonal sequence groups.
  • the processing unit 307 is configured to multiply the coded and modulated feedback information in the time domain by the following orthogonal sequence: a fixed orthogonal sequence, or an orthogonal sequence randomly selected from the orthogonal sequence group. .
  • the processing unit 307 is configured to multiply the coded and modulated feedback information in the time domain by the following orthogonal sequence: a fixed orthogonal sequence, or an orthogonal sequence randomly selected from the orthogonal sequence group. Or selecting a corresponding orthogonal sequence according to the PSCCH indication of the transmitting UE, or selecting a corresponding orthogonal sequence according to the characteristics of the receiving UE.
  • each unit in the retransmission feedback device may be implemented by a central processing unit (CPU, Central Processing Unit) or a microprocessor (MPU, Micro Processor Unit) located in the retransmission feedback device. ), or a digital signal processor (DSP, Digital Signal Processor), or Field Programmable Gate Array (FPGA).
  • CPU Central Processing Unit
  • MPU Micro Processor Unit
  • DSP Digital Signal Processor
  • FPGA Field Programmable Gate Array
  • FIG. 4 is a schematic structural diagram of a retransmission triggering apparatus according to an embodiment of the present application. As shown in FIG. 4, the apparatus includes:
  • the receiving unit 401 is configured to receive feedback information on the feedback channel and decode the feedback information
  • the measuring unit 402 is configured to measure energy of the feedback channel
  • the determining unit 403 is configured to determine, according to at least one of the following, whether to trigger a retransmission process: a decoding result of the feedback information, an energy of the feedback channel, a quantity of the feedback channel, and a type of a broadcast message.
  • the determining unit 403 is configured to determine, by using a decision criterion, whether a retransmission process needs to be triggered, where the decision criterion includes at least one of the following:
  • the retransmission process is triggered.
  • 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 codeword used in the feedback information has a one-to-one correspondence with the control channel and/or the data channel of the broadcast message;
  • the one-to-one correspondence is determined by at least one of the following manners: a pre-configuration mode, a negotiation mode, and a manner indicated by a broadcast message sending end.
  • the feedback channel includes at least one of: a NACK channel, a pair of ACKs, a NACK channel, a pair of ACKs, a NACK channel, and a second NACK channel.
  • the manner indicated by the sending end of the broadcast message includes at least one of the following:
  • the broadcast message sending end indicates whether it is required to perform feedback on the resources of the one-to-one corresponding feedback information
  • the broadcast message sender indicates the resources of the feedback information and the feedback information.
  • the resource of the feedback information is indicated by at least one of the following indication manners:
  • the index of the feedback resource with fixed time domain offset is used for indication, the time domain is used for indication, the frequency domain is used for indication, and the time-frequency domain combination is used for indication.
  • the resource of the feedback information is a set of orthogonal code groups, where each codeword in the orthogonal code group corresponds to a sequence number.
  • the broadcast message is a periodic broadcast message
  • the device further includes:
  • the processing unit 404 is configured to adjust the number of transmissions, the modulation and coding strategy, or the power parameter in the next transmission period of the broadcast message; or, in the current period of the broadcast message, re-select resources for the broadcast message, adjust the number of transmissions, modulation, and coding. Policy or power parameters.
  • each unit in the retransmission triggering device may be implemented by a CPU, or an MPU, or a DSP, or an FPGA, etc., located in the retransmission triggering device.
  • the technical solution of the embodiment of the present application is for a device that does not have a gesture recognition component (for example, not equipped
  • the camera device can control the device by gestures (such as selecting functions, configuration parameters, etc.) without the user facing the device, and the device itself has a lower cost.
  • embodiments of the present application can be provided as a method, system, or computer program product. Accordingly, the application can take the form of a hardware embodiment, a software embodiment, or an embodiment in combination with software and hardware. Moreover, the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
  • an embodiment of the present invention further provides a computer storage medium in which a calculation is stored.
  • the computer program is configured to perform the retransmission feedback method or the retransmission trigger method of the embodiment of the present invention.
  • the technical solution of the embodiment of the present application obtains at least one of the following feedback information corresponding to the broadcast message: ACK information, NACK information; and measures at least one of the following channel parameters: energy of the control channel, energy of the traffic channel, and broadcast message receiving end a distance from the transmitting end of the broadcast message; determining, according to the feedback information, the channel parameter, whether feedback of the feedback information needs to be performed on the feedback channel; if feedback of the feedback information needs to be performed on the feedback channel, encoding the feedback information After modulation, the spread spectrum is mapped to the feedback channel and transmitted on the time-frequency domain.

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Abstract

La présente invention concerne un procédé de rétroaction et de déclenchement de retransmission, un dispositif et un support de stockage informatique, consistant : à recevoir un canal de commande pour un message de diffusion ; à décoder et à vérifier un canal de service dans une ressource indiquée par le canal de commande si le décodage et la vérification du canal de commande sont corrects ; à obtenir des informations de rétroaction correspondant au message de diffusion en fonction du résultat du décodage et de la vérification du canal de service ; à mesurer un paramètre de canal ; à déterminer s'il est nécessaire de renvoyer les informations de rétroaction dans le canal de rétroaction selon les informations de rétroaction et le paramètre de canal ; lorsqu'il est nécessaire, à coder et à moduler des informations de rétroaction, puis à mapper la modulation à spectre étalé de celles-ci vers le canal de rétroaction dans un domaine temps-fréquence et la transmission. La réception des informations de rétroaction dans le canal de rétroaction, le décodage des informations de rétroaction et la mesure de l'énergie du canal de rétroaction; et la détermination s'il est nécessaire de déclencher un processus de retransmission selon au moins l'un des éléments suivants : un résultat de décodage des informations de rétroaction, l'énergie du canal de rétroaction, le nombre des canaux de rétroaction et le type du message de diffusion.
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