CN111096030B - Method, apparatus and computer readable storage medium for unlicensed band communication - Google Patents
Method, apparatus and computer readable storage medium for unlicensed band communication Download PDFInfo
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- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
Embodiments of the present disclosure relate to methods, apparatuses, and computer-readable storage media for unlicensed band communication. According to embodiments described herein, a network device communicates with a terminal device over an unlicensed frequency band. The network device may configure the terminal device with information associated with channel energy detection. According to the information of the configuration, the terminal device performs energy detection to generate an energy detection report. Based on the received energy detection report, the network device determines whether the terminal device is allowed for uplink transmission. According to the embodiments described herein, the network device can know information related to the channel energy of the terminal device when allocating uplink transmission resources, thereby improving the success rate of uplink transmission and avoiding waste of uplink transmission resources.
Description
Technical Field
Embodiments of the present disclosure relate generally to wireless communication technology and, more particularly, relate to methods, apparatuses, and computer-readable storage media for communicating with unlicensed frequency bands.
Background
Unlicensed band communication is a key technology to improve the spectral efficiency of wireless networks and to increase network capacity. Currently, in unlicensed band communications based on the third generation partnership project long term evolution (3 GPP LTE), communication devices need to perform Listen Before Talk (LBT) procedures. Typically, a communication device measures channel energy prior to accessing an unlicensed frequency band to obtain energy of a wireless channel in which the communication device is currently located. If the measured wireless channel energy is below a certain threshold energy, the communication device considers the unlicensed frequency band to be in an idle state and accesses the frequency band for communication. If the measured wireless channel energy is above a certain threshold energy, the communication device considers the unlicensed frequency band to be in an occupied state and does not communicate on the frequency band.
In the LTE licensed assisted access (LTE-LAA) standard, downlink transmissions take on a fourth type LBT access rule based on channel energy detection, while uplink transmissions may take on a fourth type LBT access rule as well as a second type LBT access rule. Details of these two types of LBT access technologies are defined in the 3gpp 36.213 specifications. In particular, for a second type of LBT access, the terminal device first makes channel measurements for at least 25us measurement time before uplink transmission. If the channel energy measured by the terminal device is below a certain threshold energy, the terminal device performs uplink transmission. The second type of LBT access is mainly used for uplink transmission procedures within the Channel Occupation Time (COT) acquired by the network device. Furthermore, a Maximum Channel Occupancy Time (MCOT) may be defined to constrain the total duration of uplink and downlink transmissions.
Disclosure of Invention
In a first aspect of the present disclosure, a communication method implemented at a network device is provided. The method comprises the following steps: receiving an energy detection report from a terminal device, the network device in communication with the terminal device on an unlicensed frequency band, the energy detection report indicating channel energy measured by the terminal device for the unlicensed frequency band; determining whether to allow the terminal device to perform uplink transmission based on the received energy detection report; and in response to determining that the terminal device is allowed to perform uplink transmission, sending a first indication to the terminal device to cause the terminal device to perform uplink transmission.
In a second aspect of the present disclosure, a communication method implemented at a terminal device is provided. The method comprises the following steps: transmitting an energy detection report to a network device, the terminal device in communication with the network device over an unlicensed frequency band, the energy detection report indicating channel energy measured by the terminal device for the unlicensed frequency band; receiving a first indication from the network device; and in response to receiving the first indication, uplink transmissions to the network device.
In a third aspect of the present disclosure, a network device is provided. The network device includes: a processor, and a memory storing instructions that when executed by the processor cause the network device to: receiving an energy detection report from a terminal device, the network device in communication with the terminal device on an unlicensed frequency band, the energy detection report indicating channel energy measured by the terminal device for the unlicensed frequency band; determining whether to allow the terminal device to perform uplink transmission based on the received energy detection report; and in response to determining that the terminal device is allowed to perform uplink transmission, sending a first indication to the terminal device to cause the terminal device to perform uplink transmission.
In a fourth aspect of the present disclosure, a terminal device is provided. The terminal device includes: a processor, and a memory storing instructions that, when executed by the processor, cause the terminal device to: transmitting an energy detection report to a network device, the terminal device in communication with the network device over an unlicensed frequency band, the energy detection report indicating channel energy measured by the terminal device for the unlicensed frequency band; receiving a first indication from the network device; and in response to receiving the first indication, uplink transmissions to the network device.
In a fifth aspect, embodiments of the present disclosure provide a computer-readable storage medium. The computer readable storage medium comprises program code stored thereon which, when executed by an apparatus, causes the apparatus to perform the method according to the first or second aspect.
It should be understood that the description in this summary is not intended to limit key or critical features of the disclosed embodiments, nor is it intended to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
The objects, advantages and other features of the present invention will become more apparent from the following disclosure and claims. For purposes of illustration only, a non-limiting description of the preferred embodiments is given herein with reference to the accompanying drawings, in which:
FIG. 1 illustrates a schematic diagram of an example communication system supporting unlicensed band communications;
FIG. 2 illustrates an interaction diagram of communications according to some embodiments of the present disclosure;
FIG. 3 illustrates a flowchart of an example method implemented at a network device, according to some embodiments of the present disclosure;
fig. 4 illustrates a flowchart of an example method implemented at a terminal device, in accordance with certain embodiments of the present disclosure;
FIG. 5 illustrates a schematic diagram of an example communication process, according to some embodiments of the present disclosure;
fig. 6 shows a block diagram of an apparatus implemented at a network device, according to an embodiment of the disclosure;
fig. 7 shows a block diagram of an apparatus implemented at a terminal device according to an embodiment of the disclosure; and
fig. 8 shows a block diagram of a communication device according to an embodiment of the present disclosure.
The same or corresponding reference numbers will be used throughout the drawings to refer to the same or like elements.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure have been shown in the accompanying drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.
The term "network device" as used herein refers to any suitable entity or device capable of providing a cell or coverage such that a terminal device may access a network through or receive services from it. Examples of network devices include, for example, base stations. The term "base station" (BS) as used herein may refer to a node B (NodeB or NB), an evolved node B (eNodeB or eNB), a Remote Radio Unit (RRU), a Radio Head (RH), a Remote Radio Head (RRH), a repeater, or a low power node such as a pico base station, femto base station, etc.
The term "terminal device" or "user equipment" (UE) as used herein refers to any entity or device capable of wireless communication with a network device or with each other. As an example, the terminal device may include a Mobile Terminal (MT), a Subscriber Station (SS), a Portable Subscriber Station (PSS), a Mobile Station (MS) or an Access Terminal (AT), the above-mentioned devices on-vehicle, a machine or an electric appliance having a communication function, and the like.
The term "including" and variations thereof as used herein are intended to be open-ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like are used merely to distinguish one element from another element. Whereas in reality a first element could also be termed a second element and vice versa. Related definitions of other terms will be given in the description below.
For ease of explanation, some embodiments of the present disclosure are described herein in the context of wireless communications (e.g., cellular communications), and employ terminology such as in 3 GPP-made long term evolution/long term evolution-advanced (LTE/LTE-a) or 5G. However, as will be appreciated by those skilled in the art, embodiments of the present disclosure are in no way limited to wireless communication systems that follow the wireless communication protocols established by 3GPP, but may be applied to any communication system where similar problems exist, such as WLAN, wired communication systems, or other communication systems developed in the future, etc.
A schematic diagram of an example communication system 100 supporting unlicensed band communications is shown in fig. 1. In this example, the communication system 100 may include network devices 110, 120 and terminal devices 130, 140. Network device 110 provides wireless connectivity for terminal devices 130 that are within its coverage area. Network device 120 provides wireless connectivity for terminal devices 140 that are within its coverage area. It should be understood that the number of network devices, terminal devices shown in fig. 1 is for illustration purposes only and is not intended to be limiting. Communication system 100 may include any suitable number of network devices and terminal devices.
Communications in communication system 100 may conform to any suitable wireless communication technology and corresponding communication standards. Examples of communication technologies include, but are not limited to, long Term Evolution (LTE), LTE-advanced (LTE-a), wideband Code Division Multiple Access (WCDMA), code Division Multiple Access (CDMA), global system for mobile communications (GSM), orthogonal frequency division multiple access (OFDM), wireless Local Area Network (WLAN), worldwide Interoperability for Microwave Access (WiMAX), bluetooth, zigbee technology, machine Type Communication (MTC), D2D, or M2M, and so forth. Moreover, communications may be performed in accordance with any suitable communication protocol including, but not limited to, transmission Control Protocol (TCP)/Internet Protocol (IP), hypertext transfer protocol (HTTP), user Datagram Protocol (UDP), session Description Protocol (SDP), and the like.
The communication system 100 operates in an unlicensed frequency band that the network devices 110, 120 share to communicate with the terminal devices 130, 140. The term "unlicensed band" as used herein means that a plurality of communication devices can share the band for data transmission through a frequency coexistence technique. Typical frequency coexistence techniques are based, for example, on the LBT rules described above. As an example, assuming that network device 110 is far from network device 120, the downlink transmission signal power from network device 120 (or network device 110) received at network device 110 (or network device 120) is less than some threshold. That is, the network devices 110 and 120 cannot sense each other. Assuming that terminal device 130 is in an overlapping portion of the coverage areas of network devices 110 and 120, the downlink transmission signal power received at terminal device 130 from either network device 110 or 120 is above a certain threshold. That is, the terminal device 130 may sense both the network device 110 and the network device 120.
As an example, assume that network device 120 is in downlink communication with terminal device 140. Since network device 110 is remote from network device 120, network device 110 determines that the unlicensed band is in an idle state by performing LBT. The network device 110 sends an uplink grant to the terminal device 130 to instruct the terminal device 130 to make an uplink transmission. The terminal device 130 is within the coverage area of the network device 120. After receiving the uplink grant, the terminal device 130 performs an LBT procedure for uplink transmission. In this example, the terminal device 130 determines that the licensed band is currently in an occupied state according to the result of the LBT, and thus cannot perform uplink transmission. This results in wasted uplink transmission resources allocated by the network device 110 for the terminal device 130. Therefore, in the above application scenario (which may be referred to as a "hidden node" scenario), the spectrum efficiency of the existing unlicensed band communication system is low.
To at least partially address the above and other potential problems, embodiments of the present disclosure propose an unlicensed band communication scheme based on channel energy detection reporting. According to embodiments described herein, a terminal device measures wireless channels of unlicensed bands to obtain energy detection reports and sends the energy detection reports to a network device. The network device determines whether the terminal device is allowed to perform uplink transmission based on the energy detection report, and sends a corresponding indication to the terminal device if the terminal device is allowed to perform uplink transmission. By the method, the network equipment can be effectively prevented from distributing unnecessary uplink transmission resources for the terminal equipment, and therefore the frequency spectrum efficiency of the unlicensed band communication network can be improved.
Fig. 2 illustrates an interaction diagram 200 of communications according to some embodiments of the present disclosure. For convenience of description, the following description is made in connection with the network device 110 and the terminal device 130 in fig. 1.
In general, according to embodiments of the present disclosure, terminal device 130 measures unlicensed bands according to a relevant measurement configuration to generate a channel energy detection report. In operation, network device 110 may send 205 configuration information associated with channel measurements to terminal device 130. Note that the terminal device 130 does not have to receive the configuration information from the network device 110. For example, in some embodiments, the terminal device 130 may also obtain configuration information associated with channel energy detection through preconfigured system information. Based on the received configuration message, the terminal device 130 performs channel energy detection and generates 210 an energy detection report.
In some embodiments, the network device 110 sends 215 an indication to the terminal device 130. The indication triggers the terminal device 130 to send an energy detection report to the network device 110. Note that the network device 110 does not have to send the above indication to the terminal device 130 to trigger the terminal device 130 to send the energy detection report. In some embodiments, the terminal device may also periodically send channel measurement detection reports to the network device 110 according to a preconfigured system broadcast message. The terminal device 130 sends 220 an energy detection report to the network device 110 according to the received indication or according to a reporting period pre-configured with the system broadcast message. Based on the received energy detection report, the network device 110 determines 225 whether the terminal device 130 is allowed for uplink transmission. If the terminal device 130 is allowed to make uplink transmissions, the network device 110 sends 230 an indication to the terminal device 130. If an indication is received from the network device 110, the terminal device 130 performs 235 uplink transmission.
Note that according to the embodiment shown in fig. 2, the network device 110 determines whether to allocate uplink transmission resources for the terminal device 130 and sends an indication to the terminal device 130 based on the channel energy measured by the terminal device 130. That is, the network device 110 may know in advance the channel state (i.e., idle or occupied) in which the terminal device 130 to be scheduled is located. Therefore, the unlicensed band communication method according to the present disclosure may avoid a situation (i.e., a "hidden node" problem) in which the terminal device 130 scheduled by the network device 110 determines that the unlicensed band is in an occupied state in performing LBT, thereby improving the success rate of uplink transmission of the terminal device 130.
Fig. 3 illustrates a flowchart of an example method 300 implemented at network device 110, according to some embodiments of the present disclosure. The method 300 shown in fig. 3 may be performed, for example, at the network device 110 or other suitable device. According to an embodiment of the present disclosure, network device 110 communicates with terminal device 130 over an unlicensed frequency band.
As shown in fig. 3, at block 315, the network device 110 receives an energy detection report from the terminal device 130. The energy detection report indicates channel energy measured by the terminal device 130 for the unlicensed frequency band. The term "channel energy" as used herein may refer to channel energy measured by a terminal device, as well as channel energy information encoded according to a predetermined threshold energy.
In embodiments according to the present disclosure, the energy detection report may include channel energy measured during a predetermined period of time, and may be implemented in a variety of ways. In one embodiment, the energy detection report may include one or more of the following: channel energy, a predetermined period of time to detect the channel energy, average channel power measured during the predetermined period of time, maximum channel power and/or minimum channel power, and so forth. It should be understood that the above-described forms of energy detection reports are merely exemplary and not limiting. In embodiments according to the present disclosure, the energy detection report may be implemented to have other suitable forms or contain other suitable information according to different system configurations and application scenarios.
According to embodiments of the present disclosure, the network device 110 may receive the energy detection report from the terminal device 130 based on different policies. For example, optionally, in some embodiments, at block 310, the network device 110 may send an indication to the terminal device 130 to trigger the terminal device 130 to send an energy detection report to the network device 110.
In some embodiments, such an indication may be sent by means of an uplink grant (UL grant), for example by adding new information bits in the uplink grant to identify the indication. Alternatively or additionally, the indication may be carried in downlink control information specific to the terminal device 130. As another example, in one embodiment, network device 110 may use additional information bits in a common physical layer downlink control channel (C-PDCCH) as the indication. Alternatively, the network device 110 may send an indication through cell-specific or terminal device group-specific downlink control information, i.e. the terminal devices that successfully decoded the cell or group-specific downlink control information all send an energy detection report to the network device 110. In some embodiments, the indication may also be sent to one or more terminal devices by Radio Resource Control (RRC) signaling, media Access Control (MAC) Control Elements (CEs), or system broadcast messages. It should be understood that different implementations may be designed for different system configurations and application scenarios in accordance with the teachings and descriptions of the present disclosure, and that all variations and combinations of the embodiments of the present disclosure are within the scope of the present disclosure.
In particular, the network device 110 does not have to send an indication to the terminal device 130 triggering the energy detection report. For example, in some embodiments, network device 110 may pre-configure terminal device 130 to periodically send energy detection reports to network device 110. Such pre-configuration may be done, for example, by system broadcast messages or RRC signaling. In such an embodiment, the network device 110 need not explicitly send the trigger indication any more. Compared with periodically sending the energy detection report, the triggering instruction is adopted to trigger the sending of the energy detection report, so that the number of times of reporting the channel measurement report of the terminal equipment can be reduced, thereby saving the uplink transmission resource of the terminal equipment and reducing the power consumption of the terminal equipment.
According to embodiments of the present disclosure, the terminal device 130 may obtain configuration information associated with the energy detection report from the network device 110 based on different manners. For example, the terminal device 130 may acquire configuration information associated with the energy detection report according to pre-configured system information. In some embodiments, the terminal device 130 may also receive the configuration message from the network device, e.g., through RRC signaling. Optionally, at block 305, the network device 110 may send configuration information associated with the energy detection report to the terminal device 130. The terminal device 130 performs channel energy detection according to the received configuration to generate an energy detection report as described above. For example, the configuration information may indicate a payload of the energy detection report. In some embodiments, the payload of the energy detection report is associated with the size of the threshold energy set used to encode the measured channel energy. Thus, configuration information associated with the energy detection report may also indicate information associated with the threshold energy set described above.
In some embodiments, the configuration information may indicate time-frequency resources for energy detection report transmission. The time-frequency resource used for the transmission of the energy detection report refers to the location of the uplink time-frequency resource used by the terminal device 130 to transmit the energy detection report to the network device 110, including, but not limited to, a predetermined time (e.g., 16 us) after downlink transmission, a predetermined location in a downlink transmission subframe, and a special subframe of the uplink.
In particular, in some embodiments, the terminal device may send downlink data together with uplink ACK/NACK in at least a portion of the downlink transmission subframe, so that the network device knows the decoding result for the downlink shared channel as early as possible. The at least a portion of the downlink transmission subframes are referred to as downlink self-contained subframes (DL self-contained subframe). Accordingly, the terminal device 130 may transmit the energy detection report in the downlink self-contained subframe. The terminal device 130 may send the energy detection report in a downlink self-contained subframe, so the network device 110 may be aware of the energy detection report from the terminal device 130 earlier, and the network device 110 may then determine whether to allow the terminal device 130 for uplink transmission faster. For example, the energy detection report and the uplink ACK/NACK information may be multiplexed in the same time-frequency resource in the self-contained subframe. Alternatively, the energy detection report and the uplink ACK/NACK may be in different time-frequency resources in the self-contained subframe. For example, the energy detection report may be at an earlier time position in the self-contained subframe than the uplink ACK/NACK, so that the network device 110 may know the energy detection report from the terminal device 130 as early as possible and determine whether to allow the terminal device 130 to transmit uplink based thereon.
In some embodiments, the configuration information may indicate time and/or frequency information associated with energy detection. The time and/or frequency information refers to a measurement duration, a measurement period, and a measurement bandwidth for which the terminal device performs channel measurement. In some embodiments, the network device 110 may send the above configuration information to the terminal device 130 through RRC signaling, MAC CE, or system broadcast message, etc.
Returning to block 315, in some embodiments, the energy detection report may include the channel energy measured by the terminal device 130. Alternatively, the channel energy detection report may also include channel energy information encoded according to a predetermined set of threshold energies. For example, table 1 below shows an example of a 1-bit energy detection report, i.e., channel energy is encoded by 1 bit. As shown in table 1, the terminal device compares the measured channel energy with a certain threshold (i.e., a first threshold energy) to implement 1-bit encoding of the detected channel energy. Specifically, if the channel energy measured by the terminal device 130 is lower than the first threshold energy, the channel energy is encoded as "0". If the channel energy measured by the terminal device 130 is higher than the first threshold energy, the channel energy is encoded as "1".
TABLE 1
| Channel energy information | Information description |
| 0 | The measured channel energy is lower than the first threshold energy |
| 1 | The measured channel energy is above a first threshold energy |
For example, table 2 below shows an example of a 2-bit energy detection report, i.e. the channel energy is encoded by 2 bits. As shown in table 2, the terminal device 130 multi-bit encodes the detected channel energy (e.g., corresponding to 2-bit encoding in table 2) according to a predetermined set of threshold energies (e.g., the second, third, and fourth threshold energies described in table 2). For example, if the measured channel energy is above the second threshold energy and below the third threshold energy, the terminal device 130 encodes the channel energy as "01". In some embodiments, the first, second, third, and fourth threshold energies shown in tables 1 and 2 may be transmitted to the terminal device 130 through system broadcast information or RRC signaling.
TABLE 2
Note that the implementations shown in tables 1 and 2 are merely exemplary. Note that, compared to the channel energy coding scheme shown in table 2, the coding complexity of the terminal device 130 can be effectively simplified, so as to reduce the signaling overhead of the terminal device 130 for sending the energy detection report, for example, reduce the payload of the energy detection report. This is advantageous for reducing the power consumption of the terminal device. It should be understood that modifications, adaptations, or variations to the embodiments of the present disclosure, in light of the descriptions or teachings of the present disclosure, are intended to be within the scope of the present disclosure. For example, for different terminal devices and different application scenarios, the network device may configure the terminal device with different configuration information associated with the energy detection report for different types of terminal devices and different quality of service requirements.
Based on the received energy detection report, the network device 110 determines whether the terminal device 130 is allowed for uplink transmission, block 320. In some embodiments, the terminal device 130 may transmit the measured channel energy to the network device 110. The network device 110 receives an energy detection report containing channel energy and compares the channel energy to a certain threshold energy or a certain set of threshold energies to determine whether to allow the terminal device 130 to make uplink transmissions. For example, in some embodiments, network device 110 may compare the channel energy to some predetermined threshold energy. If the channel energy is below the threshold energy, the network device 110 determines to allow the terminal device 130 for uplink transmission. Alternatively, the network device 110 may also determine whether the channel energy is within a given energy range. If the channel energy is within the given energy range, it is determined at the network device 110 that the terminal device 130 is allowed for uplink transmission. By associating the channel energy with a given energy range, the network device 110 may take a more flexible way to control the terminal devices 130 that are allowed to make uplink transmissions. That is, the network device 110 may only allow the terminal device 130 having channel energy within a certain predetermined energy range to perform uplink transmission. One skilled in the art may choose to employ a single threshold energy or a certain energy range to determine whether to allow the terminal device 130 to uplink transmissions, depending on different application scenarios and specific system configurations.
As shown in table 1 or table 2, the terminal device 130 may also encode the measured channel energy. The terminal device 130 then transmits the encoded channel energy information to the network device 110 in an energy detection report. In such an embodiment, the network device 110 receives encoded channel energy information. In some embodiments, if network device 110 receives the predetermined channel energy information, network device 110 determines to allow terminal device 130 to make the uplink transmission. As an example, as shown in table 1, if the received channel energy information is "0", the network device 110 device determines to allow the terminal device 130 to perform uplink transmission. It should be understood that variations, modifications, and alterations of the implementations of the disclosure, based on the description, or the teachings of this disclosure, may occur to those skilled in the art depending on the particular system configuration and the application scenario, and that other implementations obtained based on this fall within the scope of this disclosure.
At block 325, if it is determined that the terminal device 130 is allowed for uplink transmission, the network device 110 sends an indication to the terminal device 130. The indication triggers the terminal device 130 to make the uplink transmission. For ease of discussion, the indication sent at block 325 may be referred to as a "first indication" and the indication sent at optional block 310 to trigger an energy detection report may be referred to as a "second indication".
According to some embodiments of the present disclosure, the network device 110 may send the first indication to the terminal device 130 in one trigger message. The trigger message is specific to the cell in which the terminal device 130 is located and is associated with the identity of the terminal device 130. For example, the trigger message may include an identification of the terminal device that is allowed to make the uplink transmission.
Alternatively or additionally, in some embodiments, the network device 110 may also send the first indication to the terminal device 130 in another trigger message. For ease of discussion, the one trigger message may be referred to as a "first trigger message" and the other trigger message may be referred to as a "second trigger message.
The second trigger message may be specific to the terminal device 130. For example, the second trigger message is an uplink grant for the terminal device 130. In some embodiments, the second trigger message may include a 1-bit first indication and be associated with a sequence specific to terminal device 130. The 1-bit first indication is whether the terminal device is allowed for uplink transmission. The terminal device 130 receives the first indication according to its specific sequence.
In some alternative embodiments, the network device 110 may not explicitly indicate that the terminal device is allowed to uplink transmissions as described above, but rather implicitly indicate it. For example, the second trigger message may be implemented as a sequence specific to the terminal device 130 to implicitly indicate whether the terminal device 130 is allowed for uplink transmission. In such an implementation, terminal device 130 attempts to receive the second trigger message from network device 110 according to its particular sequence at a predetermined time-frequency resource. In particular, if the terminal device 130 receives successfully, it means that the network device 110 allows the terminal device 130 to make uplink transmissions. If the terminal device 130 fails to receive, it means that the network device 110 does not allow the terminal device 130 to make uplink transmission. By employing the implicit transmission of the first indication in the second trigger message as described above, the network device 110 may save the number of bits required to transmit the first indication, thereby saving the signaling overhead of the network device 110.
In general, through the method 300 shown in fig. 3, the network device 110 may be aware of the energy detection report at the terminal device 130 during scheduling of the terminal device 130. Based on the channel energy from the terminal device 130, the network device 110 may determine whether to allow the terminal device 130 to perform uplink transmission. In this way, the success rate of the terminal device 130 performing LBT in uplink transmission can be improved, thereby avoiding waste of uplink transmission resources allocated to the terminal device 130 and effectively improving unlicensed band communication efficiency.
Fig. 4 illustrates a flowchart of an example method 400 implemented at a terminal device, according to some embodiments of the present disclosure. The method 400 shown in fig. 4 may be performed, for example, at the terminal device 130 or other suitable device.
At block 415, the terminal device 130 generates an energy detection report and sends the energy detection report to the network device 110. As described above, the energy detection report indicates the channel energy measured by the terminal device 130 for the unlicensed band. The channel energy may include, for example, channel energy measured by the terminal device 130. As yet another example, the channel energy may also include channel energy information obtained by the terminal device 130 encoding the measured channel energy in accordance with a threshold energy set. For specific implementation details of the energy detection report, reference may be made to the related description for fig. 3 above, and details are not repeated here.
According to embodiments of the present disclosure, the terminal device 130 may send the energy detection report to the network device 110 based on different manners. For example, optionally, in some embodiments, terminal device 130 receives a second indication from network device 110 at block 410. The second indication triggers the terminal device 130 to send an energy detection report to the network device 110. As an example, the terminal device 130 may receive the second indication in an uplink grant. As yet another example, the terminal device 130 may receive the second indication in the terminal device 130 specific downlink control information. As yet another example, the terminal device 130 may also receive a second indication in the common downlink control information. For example, the terminal device 130 may be in cell-specific or terminal device group-specific downlink control information. Alternatively, the second indication may be any one of RRC signaling, MAC CE, and downlink control information. For further details of the second indication, reference may be made to the relevant description for fig. 3 above, which is not repeated here.
In particular, the terminal device 130 does not have to receive a second indication from the network device 110 triggering the energy detection report. For example, the terminal device 130 may also obtain a period for transmitting the energy detection report to the network device 110 according to the preconfigured system configuration information. Based on the period, the terminal device 130 may periodically send an energy detection report to the network device 110 without requiring triggering of the above-described second indication.
According to some embodiments, optionally, terminal device 130 may also receive configuration information associated with the energy detection report from network device 110 at block 405. Based on the received configuration information, the terminal device 130 performs energy detection to generate an energy detection report that is sent to the network device. Alternatively, the terminal device 130 may also acquire configuration information associated with the energy detection report according to the related information preconfigured by the system broadcast message. As described above, the configuration information may, for example, indicate a payload of the energy detection report and/or a set of threshold energies for encoding channel energy. As an example, the configuration information may also indicate time-frequency resources for energy detection report transmission. As yet another example, the configuration information may indicate time and/or frequency information associated with energy detection. For further details regarding configuration information associated with the energy detection report, reference may be made to the relevant description for fig. 3 above, which is not repeated here.
At block 420, terminal device 130 receives an indication (referred to as a "first indication") from network device 110. The first indication triggers the terminal device 130 to make an uplink transmission. In some embodiments, the terminal device 130 may receive the first indication from the network device 110 in a first trigger message. The first trigger message is specific to the cell in which the terminal device 130 is located and is associated with the identity of the terminal device 130. In some embodiments, the terminal device 130 may receive the first indication from the network device 110 in a second trigger message. The second trigger message is specific to the identity or sequence of the terminal device 130. Alternatively, the second trigger message may be an uplink grant for the terminal device.
At block 425, if the terminal device 130 receives the first indication from the network device 110, an uplink transmission is made to the network device 110.
Fig. 5 illustrates a schematic diagram of an example communication process, according to some embodiments of the present disclosure. For ease of description, it is assumed that network device 110 communicates with three terminal devices (labeled UE1, UIE2, and UE3 in fig. 5) in an unlicensed frequency band. It should be appreciated that the embodiment illustrated in fig. 5 may include any number of terminal devices, the scope of the present disclosure is not limited in this respect.
In some embodiments, the unlicensed band communication process may be split into two communication phases. In a first communication phase, the network device 110 may send an uplink transmission grant 510 to three terminal devices. For a time-frequency transmission resource, the network device 110 may allocate one or more terminal devices, i.e. multiple terminal devices may multiplex the same time-frequency transmission resource. For example, in fig. 5, UE1 is scheduled to a certain time-frequency transmission resource TF1, while UE2 and UE3 are scheduled to the same time-frequency transmission resource TF2. Note that in the first communication phase, UE1, UE2, and UE3 only prepare data to be uplink-transmitted and determine transmission resources of the uplink, and do not perform LBT and uplink transmission procedures. That is, in the first communication phase, UE1, UE2 and UE3 are only prescheduled for uplink transmission, and no uplink transmission is actually performed. Thus, the first communication phase may be referred to as a "prescheduling phase". As shown in fig. 5, in some embodiments, at some predetermined time (e.g., 16 us) after the end of the downlink transmission, UE1, UE2, and UE3 send respective energy detection reports 520 to network device 110.
In the second communication phase, based on receiving the energy detection reports 520 from the three terminal devices, the network device 110 determines whether to allow uplink transmissions for UE1, UE2 and UE 3. In particular, for UE2 and UE3 they are scheduled to the same time-frequency transmission resource TF2 in the first communication phase. In the second communication phase, for UE2 and UE3, the network device 110 may determine that only one terminal device is allowed for uplink transmission, e.g. based on the energy detection reports sent by UE2 and UE3, the terminal device priorities of UE2 and UE3, and the quality of service requirements. As an example, in case the network device 110 determines that both UE2 and UE3 are allowed for uplink transmission, the network device 110 may determine that one terminal device is allowed for uplink transmission according to the terminal device priorities of UE2 and UE3 and the quality of service requirements. As another example, if network device 110 determines that only UE2 (or UE 3) is allowed for uplink transmission, network device 110 directly determines that UE2 (or UE 3) is allowed for uplink transmission. As shown in fig. 5, in some embodiments, assuming that network device 110 selects UE3 for uplink transmission, the network device sends a first indication 530 to UE1 and UE 3. After receiving the first indication, UE1 and UE3 perform uplink transmission using uplink transmission resources TF1 and TF2 determined in the pre-scheduling stage. Note that the two-phase communication process illustrated in fig. 5 is merely some example implementations described herein, and the scope of the present disclosure is not limited in this respect.
Fig. 6 illustrates a block diagram of an apparatus 600 implemented at a network device, according to an embodiment of the disclosure. In some embodiments, the apparatus 600 may be implemented at a network device 110, 120 such as shown in fig. 1. As shown, the apparatus 600 may include a receiving unit 610 configured to receive an energy detection report from a terminal device with which the network device communicates on an unlicensed frequency band, the energy detection report indicating channel energy measured by the terminal device for the unlicensed frequency band. The apparatus 600 may further comprise a determining unit 620 configured to determine whether to allow the terminal device for uplink transmission based on the received energy detection report. The apparatus 600 may further comprise a transmitting unit 630 configured to transmit a first indication to the terminal device to cause the terminal device to perform uplink transmission in response to determining that the terminal device is allowed to perform uplink transmission.
Fig. 7 shows a block diagram of an apparatus 700 implemented at a terminal device according to an embodiment of the disclosure. In some embodiments, the apparatus 700 may be implemented at a terminal device 130, 140, such as shown in fig. 1. As shown, the apparatus 700 comprises a transmitting unit 710 configured to transmit an energy detection report to a network device, the terminal device being in communication with the network device on an unlicensed frequency band, the energy detection report indicating channel energy measured by the terminal device for the unlicensed frequency band. The apparatus 700 further comprises a receiving unit 720 configured to receive a first indication from the network device. The apparatus 700 further comprises an uplink transmission unit 730 configured to transmit uplink to the network device in response to receiving the first indication.
For clarity, certain optional modules of apparatus 600 and/or 700 are not shown in fig. 6 and 7. However, it should be appreciated that the various features described above with reference to FIGS. 1-3 are equally applicable to the apparatus 600; similarly, the various features described above with reference to FIGS. 1-2 and 4 are equally applicable to the apparatus 700. Moreover, each module of apparatus 600 and/or 700 may be a hardware module or a software module. For example, in some embodiments, apparatus 600 and/or 700 may be implemented, in part or in whole, using software and/or firmware, such as a computer program product embodied on a computer readable medium. Alternatively or additionally, the apparatus 600 and/or 700 may be implemented in part or in whole on hardware, such as an Integrated Circuit (IC), an Application Specific Integrated Circuit (ASIC), a system on a chip (SOC), a Field Programmable Gate Array (FPGA), or the like. The scope of the present disclosure is not limited in this respect.
Fig. 8 shows a block diagram of a communication device 800 according to an embodiment of the disclosure. The communication device 800 may be used to implement the network devices 110, 120 or the terminal devices 130, 140 in embodiments of the present disclosure.
As shown in the example of fig. 8, communication device 800 includes a processor 810. Processor 810 controls the operation and functions of communication device 800. For example, in some embodiments, the processor 810 may perform various operations by way of instructions 830 stored in a memory 820 coupled thereto. Memory 820 may be of any suitable type suitable to the local technical environment and may be implemented using any suitable data storage technology including, but not limited to, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems. Although only one memory unit is shown in fig. 8, there may be multiple physically distinct memory units in communication device 800.
The processor 810 may be of any suitable type suitable to the local technical environment and may include, but is not limited to, one or more cores in a general purpose computer, a special purpose computer, a microcontroller, a digital signal controller (DSP), and a controller-based multi-core controller architecture. The communication device 800 may also include a plurality of processors 810. Processor 810 may also be coupled to a transceiver 840, which transceiver 840 may enable reception and transmission of information by means of one or more antennas 850 and/or other components.
According to embodiments of the present disclosure, processor 810 and memory 820 may operate cooperatively to implement methods 300 and/or 400 described above with reference to fig. 3 and/or 4. In particular, when the communication device 800 acts as a network device 110, 120, the instructions 830 in the memory 820, when executed by the processor 810, may cause the communication device 800 to perform the method 300. When the communication device 800 acts as a terminal device 130, 140, the instructions 830 in the memory 820, when executed by the processor 810, may cause the communication device 800 to perform the method 400. It will be appreciated that all of the features described above are applicable to the communication device 800 and are not described in further detail herein.
In general, the various example embodiments of the disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While aspects of the embodiments of the present disclosure are illustrated or described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
By way of example, embodiments of the present disclosure may also be described in the context of machine-executable instructions, such as program modules, being included in devices on a real or virtual processor of a target. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. In various embodiments, the functionality of the program modules may be combined or split between described program modules. Machine-executable instructions for program modules may be executed within local or distributed devices. In a distributed device, program modules may be located in both local and remote memory storage media.
Computer program code for carrying out methods of the present disclosure may be written in one or more programming languages. These computer program code may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus such that the program code, when executed by the computer or other programmable data processing apparatus, causes the functions/operations specified in the flowchart and/or block diagram to be implemented. The program code may execute entirely on the computer, partly on the computer, as a stand-alone software package, partly on the computer and partly on a remote computer or entirely on the remote computer or server.
In the context of this disclosure, a machine-readable medium may be any tangible medium that can contain, or store a program for or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More detailed examples of a machine-readable storage medium include an electrical connection with one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical storage device, a magnetic storage device, or any suitable combination thereof.
In addition, although operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In some cases, multitasking or parallel processing may be beneficial. Likewise, although the foregoing discussion contains certain specific implementation details, this should not be construed as limiting the scope of any invention or claims, but rather as describing particular embodiments that may be directed to particular inventions. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.
Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims (34)
1. A method implemented at a network device, comprising:
receiving an energy detection report from a terminal device, the network device communicating with the terminal device on an unlicensed frequency band, the energy detection report indicating channel energy measured by the terminal device for the unlicensed frequency band, wherein a communication procedure of the communication includes a first communication phase and a second communication phase, wherein the receiving the energy detection report from the terminal device is performed in the second communication phase,
in the first communication phase, the network device allocates a time-frequency transmission resource for uplink transmission to the terminal device, wherein the time-frequency transmission resource is also allocated to a further terminal device by the network device;
in the second communication phase, the network device:
determining whether to allow the terminal device to perform uplink transmission based on the received energy detection report; and
In response to determining that the terminal device is allowed to perform uplink transmission, a first indication is sent to the terminal device to cause the terminal device to perform the uplink transmission.
2. The method of claim 1, wherein determining whether to allow the terminal device for uplink transmission comprises:
in response to the channel energy indicated by the energy detection report being below a threshold energy, it is determined that the terminal device is allowed to make the uplink transmission.
3. The method of claim 1, wherein sending the first indication to the terminal device comprises:
the first indication is sent to the terminal device in a first trigger message, which is specific to the cell in which the terminal device is located and which is associated with the identity of the terminal device.
4. The method of claim 1, wherein sending the first indication to the terminal device comprises:
and sending the first indication to the terminal equipment in a second trigger message, wherein the second trigger message is specific to the terminal equipment.
5. The method of claim 4, wherein the second trigger message is an uplink grant for the terminal device.
6. The method of claim 1, further comprising:
and sending a second indication to the terminal equipment so that the terminal equipment sends the energy detection report to the network equipment.
7. The method of claim 6, wherein sending the second indication to the terminal device comprises: transmitting the second indication in one of:
an uplink grant is sent to the mobile device,
the terminal device-specific downlink control information,
common downlink control information, and
cell-specific or terminal device group-specific downlink control information.
8. The method of claim 1, further comprising:
transmitting a configuration associated with the energy detection report to the terminal device, the configuration indicating at least one of:
the payload of the energy detection report,
time-frequency resources for the transmission of the energy detection report, and
time and/or frequency information associated with energy detection.
9. A method implemented at a terminal device, comprising:
transmitting an energy detection report to a network device, the terminal device communicating with the network device on an unlicensed frequency band, the energy detection report indicating channel energy measured by the terminal device for the unlicensed frequency band, wherein a communication procedure of the communication includes a first communication phase and a second communication phase, wherein the transmitting the energy detection report to the network device is performed in the second communication phase,
In the first communication phase, the terminal device:
preparing data for uplink transmission; and
determining time-frequency transmission resources allocated by the network device for uplink transmission, wherein the time-frequency transmission resources are also allocated by the network device to further terminal devices;
in the second communication phase, the terminal device:
receiving a first indication from the network device; and
in response to receiving the first indication, uplink transmissions are made to the network device.
10. The method of claim 9, wherein receiving a first indication from the network device comprises:
the first indication from the network device is received in a first trigger message specific to the cell in which the terminal device is located and associated with an identity of the terminal device.
11. The method of claim 9, wherein receiving a first indication from the network device comprises:
the first indication from the network device is received in a second trigger message, the second trigger message being specific to the terminal device.
12. The method of claim 11, wherein the second trigger message is an uplink grant for the terminal device.
13. The method of claim 9, further comprising:
an energy detection report is sent to the network device in response to receiving a second indication from the network device.
14. The method of claim 13, further comprising: receiving the second indication in at least one of:
an uplink grant is sent to the mobile device,
the terminal device-specific downlink control information,
common downlink control information, and
cell-specific or terminal device group-specific downlink control information.
15. The method of claim 9, further comprising:
an energy detection report is periodically sent to the network device based on the preconfigured system information.
16. The method of claim 9, further comprising:
receiving a configuration associated with the energy detection report from the network device, the configuration indicating at least one of:
the payload of the energy detection report,
time-frequency resources for the transmission of the energy detection report, and
time and/or frequency information associated with energy detection; and
the energy detection report is generated based on the configuration.
17. A network device, comprising:
a processor; and
A memory storing instructions that, when executed by the processor, cause the network device to perform actions comprising:
receiving an energy detection report from a terminal device, the network device communicating with the terminal device on an unlicensed frequency band, the energy detection report indicating channel energy measured by the terminal device for the unlicensed frequency band, wherein a communication procedure of the communication includes a first communication phase and a second communication phase, wherein the receiving the energy detection report from the terminal device is performed in the second communication phase,
in the first communication phase, the network device allocates a time-frequency transmission resource for uplink transmission to the terminal device, wherein the time-frequency transmission resource is also allocated to a further terminal device by the network device;
in the second communication phase, the network device:
determining whether to allow the terminal device to perform uplink transmission based on the received energy detection report; and
in response to determining that the terminal device is allowed to perform uplink transmission, a first indication is sent to the terminal device to cause the terminal device to perform the uplink transmission.
18. The network device of claim 17, wherein determining whether to allow the terminal device for uplink transmission comprises:
in response to the channel energy indicated by the energy detection report being below a threshold energy, it is determined that the terminal device is allowed to make the uplink transmission.
19. The network device of claim 17, wherein sending the first indication to the terminal device comprises:
the first indication is sent to the terminal device in a first trigger message, which is specific to the cell in which the terminal device is located and which is associated with the identity of the terminal device.
20. The network device of claim 17, wherein sending the first indication to the terminal device comprises:
and sending the first indication to the terminal equipment in a second trigger message, wherein the second trigger message is specific to the terminal equipment.
21. The network device of claim 20, wherein the second trigger message is an uplink grant for the terminal device.
22. The network device of claim 17, wherein the actions further comprise:
and sending a second indication to the terminal equipment so that the terminal equipment sends an energy detection report to the network equipment.
23. The network device of claim 22, wherein sending the second indication to the terminal device comprises: transmitting the second indication in one of:
an uplink grant is sent to the mobile device,
the terminal device-specific downlink control information,
common downlink control information, and
cell-specific or terminal device group-specific downlink control information.
24. The network device of claim 17, wherein the actions further comprise:
transmitting a configuration associated with the energy detection report to the terminal device, the configuration indicating at least one of:
the payload of the energy detection report,
time-frequency resources for the transmission of the energy detection report, and
time and/or frequency information associated with energy detection.
25. A terminal device, comprising:
a processor; and
a memory storing instructions that, when executed by the processor, cause the terminal device to perform actions comprising:
transmitting an energy detection report to a network device, the terminal device communicating with the network device on an unlicensed frequency band, the energy detection report indicating channel energy measured by the terminal device for the unlicensed frequency band, wherein a communication procedure of the communication includes a first communication phase and a second communication phase, wherein the transmitting the energy detection report to the network device is performed in the second communication phase,
In the first communication phase, the terminal device:
preparing data for uplink transmission; and
determining time-frequency transmission resources allocated by the network device for uplink transmission, wherein the time-frequency transmission resources are also allocated by the network device to further terminal devices;
in the second communication phase, the terminal device:
receiving a first indication from the network device; and
in response to receiving the first indication, uplink transmissions are made to the network device.
26. The terminal device of claim 25, wherein receiving a first indication from the network device comprises:
the first indication from the network device is received in a first trigger message specific to the cell in which the terminal device is located and associated with an identity of the terminal device.
27. The terminal device of claim 25, wherein receiving a first indication from the network device comprises:
the first indication from the network device is received in a second trigger message, the second trigger message being specific to the terminal device.
28. The terminal device of claim 27, wherein the second trigger message is an uplink grant for the terminal device.
29. The terminal device of claim 25, wherein the actions further comprise:
an energy detection report is sent to the network device in response to receiving a second indication from the network device.
30. The terminal device of claim 29, wherein the actions further comprise: receiving the second indication in at least one of:
an uplink grant is sent to the mobile device,
the terminal device-specific downlink control information,
common downlink control information, and
cell-specific or terminal device group-specific downlink control information.
31. The terminal device of claim 25, wherein the actions further comprise:
an energy detection report is periodically sent to the network device based on the preconfigured system information.
32. The terminal device of claim 25, wherein the actions further comprise:
receiving a configuration associated with the energy detection report from the network device, the configuration indicating at least one of:
the payload of the energy detection report,
time-frequency resources for the transmission of the energy detection report, and
time and/or frequency information associated with energy detection; and
the energy detection report is generated based on the configuration.
33. A computer readable storage medium comprising program code stored thereon, which when executed by an apparatus, causes the apparatus to perform the method according to any of claims 1-8.
34. A computer readable storage medium comprising program code stored thereon, which when executed by an apparatus, causes the apparatus to perform the method according to any of claims 9-16.
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| CN104335661A (en) * | 2012-03-26 | 2015-02-04 | 诺基亚公司 | Methods, apparatuses, and computer program products for out-of-band sensing in a cognitive lte system |
| WO2015062014A1 (en) * | 2013-10-31 | 2015-05-07 | 华为技术有限公司 | Wireless communication method and device |
| CN106452705A (en) * | 2015-08-13 | 2017-02-22 | 索尼公司 | Electronic equipment and wireless communication method in wireless communication system |
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