CN109937548B - Apparatus, method and computer program for unlicensed wireless communication - Google Patents
Apparatus, method and computer program for unlicensed wireless communication Download PDFInfo
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- CN109937548B CN109937548B CN201680090505.9A CN201680090505A CN109937548B CN 109937548 B CN109937548 B CN 109937548B CN 201680090505 A CN201680090505 A CN 201680090505A CN 109937548 B CN109937548 B CN 109937548B
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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
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
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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
- H04L1/1664—Details of the supervisory signal the supervisory signal being transmitted together with payload signals; piggybacking
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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
- H04L2001/125—Arrangements for preventing errors in the return channel
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Abstract
According to a first aspect, there is provided a client device comprising: a transceiver to send a first data transmission to a network node device via unlicensed wireless communication; and the processor is configured to perform feedback signaling detection on the sent first data transmission on a predetermined downlink time-frequency resource, where the feedback signaling detection includes determining a first decision metric value and comparing the determined first decision metric value with a first threshold and a second threshold. The processor is further configured to cause the transceiver to send a device activity detection error indication to the network node device if a value range of the determined first decision metric value is between the first threshold and the second threshold.
Description
Technical Field
The present application relates to the field of wireless communications, and in particular, to a client device, a network node device, and related methods and computer programs.
Background
In wireless systems, grant-based mechanisms are typically used for Uplink (UL) transmissions. In grant-based transmission schemes, a client device sends a Scheduling Request (SR) for data transmission to a network node device (e.g., a base station). After receiving the SR, the network node device sends a Scheduling Grant (SG) to the client device in a Downlink (DL) manner. After receiving the SG, the client device transmits its data in the UL. After receiving the data from the client device, if the network node device successfully decodes the data, the network node device sends an Acknowledgement (ACK) feedback to the client device using downlink control signaling. If the network node device fails to decode the data, the network node device sends Negative Acknowledgement (NACK) feedback to the client device using downlink control signaling. The client device then attempts to identify ACK or NACK feedback sent from the network node device.
Disclosure of Invention
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
It is an object of the present invention to provide improved unlicensed wireless communication. The foregoing and other objects are achieved by the features of the independent claims. Further embodiments are apparent from the claims, specification and drawings.
According to a first aspect, there is provided a client device for unlicensed wireless communication, wherein the client device comprises: a transceiver to send a first data transmission to a network node device via unlicensed wireless communication; a processor, configured to perform feedback signaling detection on the sent first data transmission on a predetermined downlink time-frequency resource, where the feedback signaling detection includes determining a first decision metric value and comparing the determined first decision metric value with a first threshold and a second threshold, where the first threshold represents a lower limit of an indication that the sent first data transmission is successfully processed, and the second threshold represents an upper limit of an indication that the sent first data transmission is not successfully processed. The processor is further configured to cause the transceiver to send a device activity detection error indication to the network node device if the determined value range of the first decision metric value is between the first threshold and the second threshold. The client device may detect a feedback signal from the network node relating to the unlicensed transmission and notify the network node device when a no feedback condition is detected, thereby making efficient use of resources and reducing latency.
In a first possible implementation form of the client device according to the first aspect, the processor is further configured to adjust at least one of the first threshold or the second threshold based on at least one of: a target error rate or a predetermined criterion of device activity detection error (no feedback condition) statistics. The threshold is adjusted to optimize the decision region for detecting a no feedback condition.
In a second possible implementation form of the client device according to the first aspect or the first implementation form of the first aspect, the processor is further configured to perform feedback signaling detection on the sent device activity detection error indication on a predetermined downlink time-frequency resource, where the feedback signaling detection for the sent device activity detection error indication includes determining a second decision metric value. The client device may detect a feedback signal from the network node relating to a previously transmitted device activity detection error indication, so that it may determine whether a data retransmission is required.
In a third possible implementation form of the client device according to the first aspect as such or according to any of the preceding implementation forms of the first aspect, the processor is further configured to perform a soft combining of the determined first and second decision metric values. Soft combining may improve detection performance of the client device.
In a fourth possible implementation form of the client device according to the first aspect as such or according to any of the preceding implementation forms of the first aspect, the processor is further configured to: causing the transceiver to re-transmit the first data transmission to the network node device if the second decision metric value does not correspond to successful processing of the transmitted first data transmission. The client device can perform data retransmission only when needed, thereby effectively utilizing resources.
In a fifth possible implementation form of the client device according to the first aspect as such or according to any of the preceding implementation forms of the first aspect, the processor is further configured to cause the transceiver to transmit the device activity detection error indication to the network node device connected to a second data transmission. The client device may send a device activity detection error indication along with the new data transmission to make efficient use of resources.
In a sixth possible implementation form of the client device according to the first aspect as such or according to any of the preceding implementation forms of the first aspect, the processor is further configured to perform feedback signaling detection on the sent second data transmission on the predetermined downlink time-frequency resource, where the feedback signaling detection on the sent second data transmission includes determining a third decision metric value. The client device may detect a feedback signal from the network node relating to a previously transmitted device activity detection error indication, so that it may determine whether a data retransmission is required.
In a seventh possible implementation form of the client device according to the first aspect as such or according to any of the preceding implementation forms of the first aspect, the processor is further configured to: causing the transceiver to retransmit the second data transmission to the network node device if the third decision metric value does not correspond to successful processing of the transmitted second data transmission. The client device can perform data retransmission only when needed, thereby effectively utilizing resources.
According to a second aspect, a method for unlicensed wireless communication is provided, wherein the method comprises: the client device sends a first data transmission to the network node device via the unlicensed wireless communication; the client device performs feedback signaling detection on the sent first data transmission on a predetermined downlink time-frequency resource, wherein the feedback signaling detection includes determining a first decision metric value and comparing the determined first decision metric value with a first threshold value and a second threshold value, the first threshold value represents a lower limit of an indication that the sent first data transmission is successfully processed, and the second threshold value represents an upper limit of an indication that the sent first data transmission is not successfully processed; and if the value range of the determined first decision metric value is between the first threshold value and the second threshold value, the client device sends a device activity detection error indication to the network node device. The client device may detect a feedback signal from the network node relating to the unlicensed transmission and notify the network node device when a no feedback condition is detected, thereby efficiently utilizing resources and reducing latency.
In a first possible implementation form of the method according to the second aspect, the method further comprises: the client device adjusts at least one of the first threshold or the second threshold based on at least one of: a target error rate or a predetermined criterion of device activity detection error (no feedback condition) statistics. The threshold is adjusted to optimize the decision region for detecting a no feedback condition.
In a second possible implementation form of the method according to the second aspect as such or according to the first implementation form of the second aspect, the method further comprises: and the client equipment performs feedback signaling detection on the sent equipment activity detection error indication on a preset downlink time-frequency resource, wherein the feedback signaling detection aiming at the sent equipment activity detection error indication comprises determining a second decision metric value. The client device may detect a feedback signal from the network node relating to a previously transmitted device activity detection error indication, so that it may determine whether a data retransmission is required.
In a third possible implementation form of the method according to the second aspect as such or according to any of the preceding implementation forms of the second aspect, the method further comprises: the client device performs a soft combining of the determined first and second decision metric values. Soft combining may improve detection performance of the client device.
In a fourth possible implementation form of the method according to the second aspect as such or according to any of the preceding implementation forms of the second aspect, the method further comprises: the client device resends the first data transmission to the network node device if the second decision metric value does not correspond to successful processing of the sent first data transmission. The client device can perform data retransmission only when needed, thereby effectively utilizing resources.
In a fifth possible implementation form of the method according to the second aspect as such or according to any of the preceding implementation forms of the second aspect, the device activity detection error indication is transmitted to the network node device connected to a second data transmission. The client device may send a device activity detection error indication along with the new data transmission to make efficient use of resources.
In a sixth possible implementation form of the method according to the second aspect as such or according to any of the preceding implementation forms of the second aspect, the method further comprises: and the client device performs feedback signaling detection on the sent second data transmission on the predetermined downlink time-frequency resource, wherein the feedback signaling detection on the sent second data transmission comprises determining a third decision metric value. The client device may detect a feedback signal from the network node relating to a previously transmitted device activity detection error indication, so that it may determine whether a data retransmission is required.
In a seventh possible implementation form of the method according to the second aspect as such or any of the preceding implementation forms of the second aspect, the method further comprises: the client device re-transmits the second data transmission to the network node device if the third decision metric value does not correspond to successful processing of the transmitted second data transmission. The client device can perform data retransmission only when needed, thereby effectively utilizing resources.
In an eighth possible implementation form of the method according to the second aspect as such or any of the preceding implementation forms of the second aspect, a computer program comprising program code is adapted to perform the method when the computer program runs on a computer. The client device may detect a feedback signal from the network node relating to the unlicensed transmission and notify the network node device when a no feedback condition is detected, thereby making efficient use of resources and reducing latency.
According to a third aspect, there is provided a network node device, wherein the network node device comprises: a detector to detect a device activity detection error indication for unlicensed wireless communication sent by a client device; a processor configured to determine a status of a first data transmission associated with the detected device activity detection error indication on the network node device. In response to the determined status indicating that the first data transmission has been detected and successfully processed, the processor is further configured to cause the transceiver to send an indication to the client device that the first data transmission was successfully processed; in response to the determined status indicating that the first data transmission has been detected but not successfully processed, the processor is further configured to cause the transceiver to send an indication to the client device that the first data transmission was not successfully processed. The network node device may send a feedback signal to the client device such that the client device may detect a feedback signal from the network node relating to the unlicensed transmission and notify the network node device when no feedback condition is detected, thereby efficiently utilizing resources and reducing latency.
According to a third aspect, in a first possible implementation form of the network node device, in response to the network node device detecting receipt of a second data transmission associated with the device activity detection error indication from the client device: the processor is further configured to cause the transceiver to send an indication to the client device whether to successfully process the second data transmission. The network node device may send a feedback signal to the client device such that the client device may detect a feedback signal from the network node relating to the unlicensed transmission and notify the network node device when no feedback condition is detected, thereby efficiently utilizing resources and reducing latency.
In a second possible implementation form of the network node device according to the third aspect as such or according to the first implementation form of the third aspect, the processor is further configured to cause the transceiver to transmit the indication of whether the second data transmission was successfully processed to the client device together with the indication of whether the first data transmission was successfully processed. The network node device may send a feedback signal to the client device such that the client device may detect a feedback signal from the network node relating to the unlicensed transmission and notify the network node device when no feedback condition is detected, thereby efficiently utilizing resources and reducing latency.
According to a fourth aspect, there is provided a method for handling a device activity detection error indication, wherein the method comprises: the method comprises the steps that a network node device detects a device activity detection error indication which is sent by a client device and used for the authorization-free wireless communication; determining, by the network node device, a status of a first data transmission associated with the detected device activity detection error indication on the network node device; in response to the determined status indicating that the first data transmission has been detected and successfully processed, the network node device sending an indication to the client device that the first data transmission was successfully processed; in response to the determined status indicating that the first data transmission has been detected but not successfully processed, the network node device sends an indication to the client device that the first data transmission was not successfully processed. The network node device may send a feedback signal to the client device such that the client device may detect a feedback signal from the network node relating to the unlicensed transmission and notify the network node device when no feedback condition is detected, thereby efficiently utilizing resources and reducing latency.
In a first possible implementation manner of the method according to the fourth aspect, the method further includes: if the network node device detects receipt of a second data transmission associated with the device activity detection error indication from the client device: the network node device sends an indication to the client device whether to successfully process the second data transmission. The network node device may send a feedback signal to the client device such that the client device may detect a feedback signal from the network node relating to the unlicensed transmission and notify the network node device when no feedback condition is detected, thereby efficiently utilizing resources and reducing latency.
In a second possible implementation form of the method according to the fourth aspect as such or according to the first implementation form of the fourth aspect, the indication of whether the second data transmission was successfully processed is sent to the client device together with the indication of whether the first data transmission was successfully processed. The network node device may send a feedback signal to the client device such that the client device may detect a feedback signal from the network node relating to the unlicensed transmission and notify the network node device when no feedback condition is detected, thereby efficiently utilizing resources and reducing latency.
In a third possible implementation form of the method according to the fourth aspect as such or according to any of the preceding implementation forms of the fourth aspect, a computer program comprising program code is adapted to perform the method when the computer program runs on a computer. The network node device may send a feedback signal to the client device such that the client device may detect a feedback signal from the network node relating to the unlicensed transmission and notify the network node device when no feedback condition is detected, thereby efficiently utilizing resources and reducing latency.
Many of the attendant features will be more readily appreciated as the same becomes better understood by reference to the following detailed description considered in connection with the accompanying drawings.
Drawings
The specification will be better understood from the following detailed description read in light of the accompanying drawings, in which:
fig. 1A is a signaling diagram of a method according to an example;
fig. 1B is a signaling diagram of a method according to an example;
fig. 1C is a signaling diagram of a method according to an example;
FIG. 2A is a block diagram of a client device according to one embodiment;
fig. 2B is a block diagram of a network node device according to one embodiment;
fig. 3 illustrates a threshold value according to an example.
Similar references are used to designate similar components in the accompanying drawings.
Detailed Description
The detailed description provided below in connection with the appended drawings is intended as a description of the embodiments and is not intended to represent the only forms in which the embodiments may be constructed or utilized. However, the same or equivalent functions and structures may be accomplished by different embodiments.
Unlicensed uplink transmissions are being developed, for example, to reduce the signaling overhead and transmission delay associated with data transmissions from client devices to network node devices (e.g., macro, pico, or home enodebs). For example, unlicensed UL transmission may be used, thereby providing large-scale machine type communication (mtc) and high-reliable low-latency communication (URLLC) services.
On the time-frequency resources allocated for the unlicensed UL, there may be more than one client device that may transmit its data on a given time-frequency resource in a contention-based manner. Multiple client devices transmitting on the same time-frequency Resource Unit (RU) in the unlicensed transmission mode typically use orthogonal signatures for data transmission and reference signal transmission. After receiving transmissions from multiple client devices simultaneously, the network node device needs to identify whether a particular client device is active (i.e., has sent data). For this purpose, the network node device conducts a client device activity test, which may for example comprise calculating a correlation coefficient between the received reference signal and a set of known client device signatures, and comparing the resulting value with a threshold value. The result of the test performed by the network node device corresponding to the client device may be negative even if the client device has sent data to the network node device. Here, such an error event is denoted as a client device activity detection error. If a client device activity detection error occurs, the network node device will not send any ACK or NACK signals to the client device. This situation is referred to as a no feedback scenario.
The client devices may include various devices, such as User Equipment (UE), directly used by the end user entity to enable communication in the wireless network. These devices include, but are not limited to, smart phones, tablets, smart watches, laptops, Internet of Things (IoT) devices, and the like. Although embodiments may be described in terms of client devices, this is by way of example only and not by way of limitation. Further embodiments may include a network node device, such as a base station. Also, although embodiments may be described in terms of network node devices, this is by way of example only and not by way of limitation. The network node device may comprise, for example, a macro eNodeB, a pico eNodeB, a home eNodeB, a fifth generation base station (gNB), or any such device that provides an air interface for client devices to connect to the wireless network through unlicensed uplink transmissions.
In the following description of fig. 1A to 1C, three different exemplary scenarios will be used to describe the functionality of the client device 200 and the network node device 210 according to embodiments of the present invention. Some of the features of the apparatus are optional features which provide further advantages. Further, the client device 200 and optional features thereof will be described in more detail later using FIG. 2A. Further, network node device 210 and its optional features will be described in more detail later using fig. 2B.
Fig. 1A is a signaling diagram of a method according to one example. For example, the example of fig. 1A may be used when no immediate data (e.g., its send buffer is empty) may be sent to network node device 210 by client device 200 after the first data transmission of operation 101.
In operation 101, client device 200 sends a first data transmission to network node device 210 via unlicensed wireless communication. As described above, there may be multiple client devices transmitting their data on a given time-frequency resource, e.g., in a contention-based manner. For clarity, only one client device is shown in FIG. 1A. Multiple client devices may use orthogonal signatures for data transmission and/or reference signal transmission, for example. Here, the data transmission may include one or more data packets.
In operation 102, the network node device 210 conducts a client device activity test, which may include, for example, calculating a correlation coefficient between the received reference signal and a set of known client device signatures, and comparing the resulting value to a threshold.
If network node device 210 successfully identifies that client device 200 sent data (i.e., that client device 200 is included in the set of active client devices), network node device 210 estimates channel coefficients associated with the active client devices including client device 200 and decodes its data (operation 103).
If the data decoding associated with the client device 200 is successful, the network node device 210 sends ACK feedback to the client device 200 based on the identity established during the client device activity test (operation 104). If the data decoding associated with the client device 200 fails, the network node device 210 sends NACK feedback to the client device 200 based on the identity established during the client device activity test in operation 104. However, it should be appreciated that due to the wireless channel between client device 200 and network node device 210, the ACK or NACK feedback sent in operation 104 may not reach client device 200 (e.g., due to the received feedback signal strength falling below the receiver sensitivity level of client device 200) or may not be properly detected in client device 200.
If a client device activity detection error occurs in operation 102, network node device 210 will not send any ACK or NACK signals to client device 200 in operation 104. In one example, in the event of a client device activity detection error in operation 102, network node device 210 does not send any feedback to client device 200 at all.
In operation 105, the client device 200 performs feedback signaling detection on the first data transmission sent on the predetermined downlink time-frequency resource in operation 101. The feedback signaling detection in operation 105 comprises determining a first decision metric value and comparing the determined first decision metric value with a first threshold value and a second threshold value. The first threshold value represents a lower limit for successfully processing the transmitted indication of the first data transmission and the second threshold value represents an upper limit for unsuccessfully processing the transmitted indication of the first data transmission.
In one embodiment, the first threshold represents a lower limit for successfully processing the transmitted indication of the first data transmission and the second threshold represents an upper limit for unsuccessfully processing the transmitted indication of the first data transmission. In another embodiment, the first threshold represents a lower limit for an indication that the transmitted first data transmission was not successfully processed and the second threshold represents an upper limit for an indication that the transmitted first data transmission was successfully processed.
Fig. 3 illustrates these thresholds according to one embodiment. In the example 300 of fig. 3, the ACK signal is mapped to the +1 symbol, the NACK signal is mapped to the-1 symbol, and no feedback is mapped to the symbol 0.
After determining the first decision metric value M over signals received on predetermined time-frequency resources (which may be specified, for example, by the communication standard as a resource for feedback signaling between the network node and the client device and thus known to both the network node device 210 and the client device 200), the client device 200 may compare the determined decision metric value with two thresholds T 1301, and T 2302, a comparison is made. The determination of the decision metric value may for example comprise calculating a probability or log-likelihood ratio value for receiving an ACK or NACK or no feedback signal. Client device 200 may select T based on a target error rate and/or feedback-free detection statistics for initial unlicensed transmissions, and/or the like1And T2And then adjusted in operation 113. For example, in selecting T1And T2If the client device observes only a small number (e.g., less than 1%) of no-feedback detection decisions within a particular time period after the initial value of (a), the client device may select a different T in operation 1131And T2Thereby reducing the decision area for detecting no feedback signal.
During detection, if M ≧ T, as shown in FIG. 31Then it may be determined that an ACK signal is sent from network node device 210. If M is<T2Then a NACK signal may be determined to have originated from network node device 210. If T is2≤M<T1Then the client device 200 may conclude that it corresponds to a no feedback scenario. In other words, the client device 200 assumes a network nodeThe device 210 does not send any feedback (although it may have completed, the client device 200 cannot properly detect the feedback). Thus, in operation 102, client device 200 determines that a client device activity detection error may have occurred on network node device 210.
If the determined value of the first decision metric value ranges between the first threshold and the second threshold, the client device 200 sends a device activity detection error indication to the network node device 210 (operation 106 a). For a device activity detection error indication, client device 200 may, for example, send a single bit to indicate that the client device detected a device activity detection error on the network node. For device activity detection error indications, client device 200 may use, for example, UL data channel resources (grant-less or grant-based) or control channel resources.
In operation 107, the network node device 210 detects a device activity detection error indication sent from the client device.
In operation 108, network node device 210 determines a status of a first data transmission in network node device 210 associated with the detected device activity detection error indication (i.e., the first data transmission in operation 101).
In operation 109a, if the status determined in operation 108 indicates that the first data transmission in the network node apparatus 210 has been detected and successfully processed, the network node apparatus 210 sends an indication (e.g., an ACK signal) to the client device 200 that the first data transmission was successfully processed. If the status determined in operation 108 indicates that the first data transmission in network node device 210 has been detected but not successfully processed, network node device 210 sends an indication (e.g., a NACK signal) to client device 200 that the first data transmission was not successfully processed in operation 109 a. Both of these situations may occur, for example, if the client device 200 does not receive the ACK/NACK feedback signaling sent in operation 104 (e.g., because the received feedback signal strength is below the receiver sensitivity level of the client device 200), or the client device 200 erroneously detects a no feedback situation in operation 105. If the status determined in operation 108 indicates that the first data transmission was not detected in the network node device 210, the network node device 210 may not send feedback to the client device 200 in operation 109 a. Network node device 210 may, for example, use downlink control signaling when sending an indication of whether the first data transmission was successfully processed.
In operation 110a, the client device 200 performs feedback signaling detection on the device activity detection error indication transmitted on the predetermined downlink time-frequency resource. The predetermined downlink time-frequency resource used in operation 110a may be the same as the downlink time-frequency resource used in operation 105. Feedback signaling detection for the transmitted device activity detection error indication includes determining a second decision metric value. Feedback signaling detection for the transmitted device activity detection error indication may also include comparing the determined second decision metric value to a threshold, e.g., similar to operation 105.
In optional operation 111, the client device 200 may perform soft combining of the determined first and second decision metric values, e.g., to improve detection performance of the client device 200.
In operation 112a, if the determined second decision metric value corresponds to unsuccessful processing of the first data transmission sent in operation 101 (i.e. if the determined second decision metric value indicates that network node device 210 sent a NACK signal in operation 109a, or if the determined second decision metric value indicates that network node device 210 did not send any feedback signal in operation 109a, and thus a no feedback situation occurred), client device 200 resends the first data transmission to network node device 210. When the first data transmission is resent in operation 112a, the client device 200 may use the same or a different redundancy version.
Fig. 1B is a signaling diagram of a method according to another example. The example of fig. 1B may be used, for example, when the client device 200 has another data to send to the network node 210 after the first data transmission of operation 101.
In the example of fig. 1B, operations 101-105 are substantially similar to corresponding operations in the example of fig. 1A. Therefore, it will not be described in detail here.
In operation 106b, the client device 200 sends a device activity detection error to the network node device 210 if the determined value range of the first decision metric value is between the first threshold and the second threshold. However, in operation 106b, a device activity detection error indication is transmitted by the unlicensed wireless communication in combination with the second data transmission. For example, to send a device activity detection error indication, the client device 200 may send additional bits carrying this information. The additional bits may be sent in an implicit or explicit manner. Here, the implicit way may e.g. comprise that additional bits are embedded, e.g. as part of the antenna selection for the second data transmission or that a different channel code is used for the second data transmission. If the additional bits are explicitly transmitted, they may be transmitted together with the second data transmission or separately. The second data transmission may use the time-frequency resources allocated for the grant-free transmission and may, for example, transmit additional bits on control channel resources if the additional bits are explicitly transmitted using separate time-frequency resources.
In operation 106c, network node device 210 conducts another client device activity test, which may be similar to the client device activity test in operation 102. In the example of fig. 1B, assume that network node device 210 failed to detect the second data transmission (i.e., the second data transmission experienced a client device activity detection error). Further, in the example of fig. 1B, it is assumed that network node device 210 successfully detected the device activity detection error indication sent in operation 106B.
In the example of fig. 1B, operations 107-109 a are substantially similar to corresponding operations in the example of fig. 1A. Therefore, it will not be described in detail here.
In operation 110b, the client device 200 performs feedback signaling detection on the transmitted device activity detection error indication and the transmitted second data transmission on a predetermined downlink time-frequency resource. The predetermined downlink time-frequency resource used in operation 110b may be the same as the downlink time-frequency resource used in operation 105. The feedback signaling detection for the transmitted second data transmission includes determining a third decision metric value. The feedback signaling detection for the transmitted device activity detection error indication and/or the transmitted second data transmission may further comprise comparing the determined decision metric value to a threshold, similar to operation 105.
The feedback signaling detection of operation 110b may further include: for example, the client device 200 first performs blind detection to determine whether the feedback signaling contains multiplexed (corresponding to the first and second transmissions) or non-multiplexed (corresponding to the first transmission only) feedback information. The multiplexed feedback information will be used for the example of fig. 1C and will be described in more detail below. In the example of fig. 1B, non-multiplexed feedback information is used, similar to the example of fig. 1A.
The following operations 111 to 113 are substantially similar to the corresponding operations in the example of fig. 1A. Therefore, it will not be described in detail here.
Fig. 1C is a signaling diagram of a method according to another example. The example of fig. 1C may be used, for example, when the client device 200 has another data to send to the network node 210 after the first data transmission of operation 101. In the example of fig. 1C, it is assumed that network node device 210 successfully detected the second data transmission and device activity detection error indication sent in operation 106 b.
In the example of fig. 1C, operations 101-105 are substantially similar to corresponding operations in the example of fig. 1A and 1B. Therefore, it will not be described in detail here. Further, operation 106B is substantially similar to the corresponding operation in the example of fig. 1B. Therefore, it will not be described in detail here.
In operation 106c, network node device 210 conducts another client device activity test, which may be similar to the client device activity test in operation 102. In the example of fig. 1C, network node device 210 detects the second data transmission. Accordingly, in operation 106d, the network node device 210 data decodes the second data transmission, similar to operation 103.
In operation 107, the network node device 210 detects a device activity detection error indication sent from the client device. In operation 108, network node device 210 determines a status of a first data transmission in network node device 210 associated with the detected device activity detection error indication (i.e., the first data transmission in operation 101).
Because in the example of fig. 1C, network node device 210 detected the device activity detection error indication and the second unlicensed data transmission from client device 200, the following scenario may occur in the network node:
a. successful decoding of the first and second transmissions;
b. the first transmission is successfully decoded, but the second transmission is decoded incorrectly;
c. the first transmission is in client device activity detection error, but the second transmission is successfully decoded;
d. the first transmission has a client device activity detection error and the second transmission has a data decoding error;
e. the first transmission sends a data decode error, but the second transmission decodes successfully; or
f. Data decoding errors occurred for both the first and second transmissions.
If scenario c or e occurs, network node device 210 sends a feedback signal to indicate that only the first data packet needs to be retransmitted.
If scenario d or f occurs, network node device 210 sends a feedback signal to indicate that both data packets need to be retransmitted.
If scenario a occurs, network node device 210 sends a feedback signal to indicate that both data packets were successfully decoded.
If scenario b occurs, the network node device 210 sends a feedback signal to indicate that only the second data message needs to be retransmitted.
Since four possible types of feedback signals are to be sent to the client device 200, the network node device 210 may send the feedback signals using, for example, two bits. For example, network node device 210 may use bit pattern 01 for event c or e, bit pattern 00 for event d or f, bit pattern 11 for event a, and bit pattern 10 for event b.
In operation 109b, the network node device 210 sends feedback signaling to the client device 200. The feedback signaling may include multiplexed feedback corresponding to the two transmissions from the client device 200 as described above.
In operation 110c, the client device 200 performs feedback signaling detection on the transmitted device activity detection error indication and the transmitted second data transmission on a predetermined downlink time-frequency resource. The feedback signaling detection of operation 110c comprises: for example, the client device 200 first performs blind detection to determine whether the feedback signaling contains multiplexed (corresponding to the first and second transmissions) or non-multiplexed (corresponding to the first transmission only) feedback information.
The predetermined downlink time-frequency resource used in operation 110c may be the same as the downlink time-frequency resource used in operation 105. The feedback signaling detection for the transmitted second data transmission includes determining a third decision metric value. The feedback signaling detection for the transmitted device activity detection error indication and/or the transmitted second data transmission may further comprise comparing the determined decision metric value to a threshold, similar to operation 105. More specifically, in the example of fig. 1C, the client device 200 determines whether: i) retransmitting the two data transmissions; ii) retransmitting only the first data transmission; iii) retransmitting only the second data transmission; or iv) no retransmission is required.
Accordingly, in operation 112b, the client device 200 retransmits the first data transmission and/or the second data transmission to the network node device 210 based on the result of the feedback signaling detection of operation 110 c.
Fig. 2A is a block diagram of a client device 200 according to one embodiment. Client device 200 includes a transceiver 202 for sending a first data transmission to a network node device 210 via unlicensed wireless communication.
The client device 200 further comprises a processor 201, configured to perform feedback signaling detection on the first data transmission sent on the predetermined downlink time-frequency resource. The feedback signaling detection comprises determining a first decision metric value and comparing the determined first decision metric value with a first threshold value and a second threshold value. The first threshold value represents a lower limit for successfully processing the transmitted indication of the first data transmission and the second threshold value represents an upper limit for unsuccessfully processing the transmitted indication of the first data transmission.
The client device 200 may also include a memory 203 for storing computer programs and the like.
The processor 201 is further configured to cause the transceiver 202 to send a device activity detection error indication to the network node device 210 if the determined value of the first decision metric value ranges between the first threshold and the second threshold.
According to one embodiment, the processor 201 is further configured to adjust at least one of the first threshold or the second threshold based on at least one of: a target error rate or a predetermined criterion of device activity detection error statistics.
According to an embodiment, the processor 201 is further configured to perform feedback signaling detection on the device activity detection error indication sent on the predetermined downlink time-frequency resource. Feedback signaling detection for the transmitted device activity detection error indication includes determining a second decision metric value.
According to an embodiment, the processor 201 is further configured to perform a soft combining of the determined first decision metric value and second decision metric value.
According to one embodiment, the processor 201 is further configured to: if the second decision metric value does not correspond to successful processing of the transmitted first data transmission, causing the transceiver 202 to retransmit the first data transmission to the network node device 210.
According to an embodiment, the processor 201 is further configured to cause the transceiver 202 to transmit a device activity detection error indication to a network node device 210 connected to the second data transmission.
According to an embodiment, the processor 201 is further configured to perform feedback signaling detection on the second data transmission sent on the predetermined downlink time-frequency resource. The feedback signaling detection for the transmitted second data transmission includes determining a third decision metric value.
According to one embodiment, the processor 201 is further configured to: causing the transceiver 202 to retransmit the second data transmission to the network node device 210 if the third decision metric value does not correspond to successful processing of the transmitted second data transmission.
Fig. 2B is a block diagram of network node device 210 according to one embodiment. Network node device 210 includes a detector 214 to detect a device activity detection error indication sent by client device 200 for unlicensed wireless communication.
In response to the determined status indicating that the first data transmission has been detected and successfully processed, the processor 211 is further configured to cause the transceiver 212 to send an indication of successful processing of the first data transmission to the client device 200. In response to the determined status indicating that the first data transmission has been detected but not successfully processed, the processor 211 is further configured to cause the transceiver 212 to send an indication to the client device 200 that the first data transmission was not successfully processed.
According to one embodiment, in response to the network node device 210 detecting receipt of the second data transmission associated with the device activity detection error indication from the client device 200: the processor 211 is further configured to cause the transceiver 212 to send an indication to the client device 200 whether the second data transmission was successfully processed. According to one embodiment, the processor 211 is further configured to cause the transceiver 212 to transmit an indication of whether the second data transmission was successfully processed to the client device 200 together with an indication of whether the first data transmission was successfully processed.
The functions described herein may be performed, at least in part, by one or more computer program product components, such as software components. According to the present embodiment, the client device 200 and/or the network node device 210 comprise a processor, which when executed is configured by program code, for performing the described embodiments of operations and functions. Alternatively, or in addition, at least some of the functions described herein may be performed by one or more hardware logic components. For example, illustrative types of hardware logic components that may be used include, but are not limited to, Field-Programmable Gate arrays (FPGAs), Application-specific Integrated circuits (ASICs), Program-specific Standard products (ASSPs), System-On-a-chips (SOCs), Complex Programmable Logic Devices (CPLDs), and Graphics Processing Units (GPUs).
Any range or device value given herein can be extended or altered without losing the effect sought, and any embodiment can be combined with another embodiment unless explicitly prohibited.
Although the subject matter herein has been described in language specific to structural features and/or acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as examples of implementing the claims, and other equivalent features and acts are intended to be within the scope of the claims.
It is to be understood that the benefits and advantages described above may relate to one embodiment, or may relate to multiple embodiments. Embodiments are not limited to embodiments that solve any or all of the problems or embodiments having any or all of the benefits and advantages described. It is further understood that the terms "a" and "an" may refer to one or more.
The steps of the methods described herein may be performed in any suitable order, or simultaneously where appropriate. In addition, individual blocks may be deleted from any of the methods without departing from the spirit and scope of the subject matter described herein. Aspects of any of the embodiments described above may be combined with aspects of any of the other embodiments described to further form an embodiment without detracting from the effects sought.
The term "comprising" is used herein to mean including the stated method, block or element, but that such block or element does not include the exclusive list, and that the method or apparatus may include additional blocks or elements.
It should be understood that the above description is given by way of example only and that various modifications may be made by those skilled in the art. The above specification, examples and data provide a complete description of the structure and use of the exemplary embodiments. Although various embodiments have been described above with a certain degree of particularity, or with reference to one or more individual embodiments, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the spirit or scope of this disclosure.
Claims (14)
1. A client device (200) for unlicensed wireless communication, comprising:
a transceiver (202) for sending a first data transmission to a network node device by unlicensed wireless communication;
a processor (201) configured to perform feedback signaling detection on the transmitted first data transmission on a predetermined downlink time-frequency resource, wherein the feedback signaling detection includes determining a first decision metric value and comparing the determined first decision metric value with a first threshold (301) and a second threshold (302), the first threshold representing a lower limit for an indication that the transmitted first data transmission is successfully processed, and the second threshold representing an upper limit for an indication that the transmitted first data transmission is not successfully processed; wherein
If the determined first decision metric value ranges between the first threshold (301) and the second threshold (302), the processor (201) is further configured to cause the transceiver (202) to send a device activity detection error indication to the network node device, the device activity detection error indication being configured to indicate to the network node device to determine a status of the first data transmission;
the processor (201) is further configured to adjust at least one of the first threshold (301) or the second threshold (302) based on at least one of: a target error rate or a predetermined criterion of device activity detection error statistics.
2. The client device (200) according to claim 1, wherein the processor (201) is further configured to perform feedback signaling detection on the transmitted device activity detection error indication on a predetermined downlink time-frequency resource, wherein the feedback signaling detection for the transmitted device activity detection error indication comprises determining a second decision metric value.
3. The client device (200) of claim 2, wherein the processor (201) is further configured to perform a soft combining of the determined first and second decision metric values.
4. The client device (200) of claim 2 or 3, wherein the processor (201) is further configured to: causing the transceiver (202) to re-transmit the first data transmission to the network node device if the second decision metric value does not correspond to successful processing of the transmitted first data transmission.
5. A client device (200) according to any of claims 1-3, wherein the processor (201) is further configured to cause the transceiver (202) to transmit the device activity detection error indication to the network node device connected to a second data transmission.
6. The client device (200) of claim 5, wherein the processor (201) is further configured to perform feedback signaling detection on the transmitted second data transmission on the predetermined downlink time-frequency resource, wherein the feedback signaling detection on the transmitted second data transmission comprises determining a third decision metric value.
7. The client device (200) of claim 6, wherein the processor (201) is further configured to: causing the transceiver (202) to retransmit the second data transmission to the network node device if the third decision metric value does not correspond to successful processing of the transmitted second data transmission.
8. A method for unlicensed wireless communication, comprising:
the client device sends (101) a first data transmission to the network node device via the unlicensed wireless communication;
the client device performs (105) a feedback signaling detection on the transmitted first data transmission on a predetermined downlink time-frequency resource, wherein the feedback signaling detection comprises determining a first decision metric value and comparing the determined first decision metric value with a first threshold value and a second threshold value, wherein the first threshold value represents a lower limit for an indication that the transmitted first data transmission was successfully processed, and the second threshold value represents an upper limit for an indication that the transmitted first data transmission was not successfully processed;
if the determined value range of the first decision metric value is between the first threshold and the second threshold, the client device sending (106 a, 106 b) a device activity detection error indication to the network node device, the device activity detection error indication being used to indicate to the network node device to determine the state of the first data transmission;
wherein at least one of the first threshold or the second threshold is adjusted based on at least one of: a target error rate or a predetermined criterion of device activity detection error statistics.
9. A storage device of a computer for storing a computer program for performing the method of claim 8 when the computer program runs on the computer.
10. A network node device (210), comprising:
a detector (214) for detecting a device activity detection error indication sent by the client device for unlicensed wireless communication; wherein the client device performs (105) a feedback signaling detection on the sent first data transmission on a predetermined downlink time-frequency resource, wherein the feedback signaling detection comprises determining a first decision metric value and comparing the determined first decision metric value with a first threshold value and a second threshold value, wherein the first threshold value represents a lower limit for an indication that the sent first data transmission was successfully processed, and the second threshold value represents an upper limit for an indication that the sent first data transmission was not successfully processed; if the determined value range of the first decision metric value is between the first threshold and the second threshold, the client device sending (106 a, 106 b) a device activity detection error indication to the network node device, the device activity detection error indication being used to indicate to the network node device to determine the state of the first data transmission; wherein at least one of the first threshold or the second threshold is adjusted based on at least one of: a predetermined criterion of a target error rate or device activity detection error statistic;
a processor (211) for determining a status of a first data transmission associated with the detected device activity detection error indication on the network node device;
a transceiver (212);
wherein
In response to the determined status indicating that the first data transmission has been detected and successfully processed, the processor (211) is further configured to cause the transceiver (212) to send an indication to the client device that the first data transmission was successfully processed;
in response to the determined status indicating that the first data transmission has been detected but not successfully processed, the processor (211) is further configured to cause the transceiver (212) to send an indication to the client device that the first data transmission was not successfully processed.
11. The network node device (210) of claim 10, wherein, in response to the network node device (210) detecting receipt of a second data transmission associated with the device activity detection error indication from the client device:
the processor (211) is further configured to cause the transceiver (212) to send an indication to the client device whether the second data transmission was successfully processed.
12. The network node apparatus (210) of claim 11, wherein the processor (211) is further configured to cause the transceiver (212) to send the indication of whether the second data transmission was successfully processed to the client device along with the indication of whether the first data transmission was successfully processed.
13. A method for processing a device activity detection error indication, comprising:
the network node device detects (107) a device activity detection error indication sent by the client device for unlicensed wireless communication; wherein the client device performs (105) a feedback signaling detection on the sent first data transmission on a predetermined downlink time-frequency resource, wherein the feedback signaling detection comprises determining a first decision metric value and comparing the determined first decision metric value with a first threshold value and a second threshold value, wherein the first threshold value represents a lower limit for an indication that the sent first data transmission was successfully processed, and the second threshold value represents an upper limit for an indication that the sent first data transmission was not successfully processed; if the determined value range of the first decision metric value is between the first threshold and the second threshold, the client device sending (106 a, 106 b) a device activity detection error indication to the network node device, the device activity detection error indication being used to indicate to the network node device to determine the state of the first data transmission; wherein at least one of the first threshold or the second threshold is adjusted based on at least one of: a predetermined criterion of a target error rate or device activity detection error statistic;
determining (108), by the network node device, a status of a first data transmission associated with the detected device activity detection error indication on the network node device;
in response to the determined status indicating that the first data transmission has been detected and successfully processed, the network node device sending (109 a, 109 b) an indication to the client device that the first data transmission was successfully processed;
in response to the determined status indicating that the first data transmission has been detected but not successfully processed, the network node device sends (109 a, 109 b) an indication to the client device that the first data transmission was not successfully processed.
14. A storage device of a computer for storing a computer program for performing the method of claim 13 when the computer program runs on the computer.
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| PCT/EP2016/076128 WO2018077430A1 (en) | 2016-10-28 | 2016-10-28 | Devices, methods and computer programs for grant-free wireless communication |
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| WO1998015140A1 (en) * | 1996-09-30 | 1998-04-09 | Motorola Inc. | Two-way radio communication system |
| CN105557047A (en) * | 2013-07-12 | 2016-05-04 | 康维达无线有限责任公司 | Communication system, mobile station device, and communication method |
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| US8233932B2 (en) * | 2007-02-02 | 2012-07-31 | Qualcomm Incorporated | Method and apparatus for improving signaling reliability in wireless communications |
| US7885238B2 (en) * | 2007-08-03 | 2011-02-08 | Alcatel-Lucent Usa Inc. | Methods for detecting acknowledgement channels using probabilities |
| US20110019529A1 (en) * | 2009-07-23 | 2011-01-27 | Qualcomm Incorporated | Interference suppression in uplink acknowledgement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998015140A1 (en) * | 1996-09-30 | 1998-04-09 | Motorola Inc. | Two-way radio communication system |
| CN105557047A (en) * | 2013-07-12 | 2016-05-04 | 康维达无线有限责任公司 | Communication system, mobile station device, and communication method |
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