CN113068272A - Terminal equipment for enhancing random access and access network equipment - Google Patents
Terminal equipment for enhancing random access and access network equipment Download PDFInfo
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Abstract
The present disclosure describes an access network device for enhancing random access, including a second transceiver unit and a second processing unit; the second processing unit generates a plurality of sending resources based on the first message, configures distance information, and sends a plurality of second messages by the second transceiver unit, if the terminal device sends a third message according to a target second message obtained based on the target path loss, the second processing unit generates a fourth message and sends the fourth message according to the distance information corresponding to the sending resource of the third message by the second transceiver unit, if the terminal device judges that the interference resolution ID of the fourth message is equal to the third message, and sends a confirmation message, the second processing unit allocates a resource for receiving a fifth message according to the distance information of the terminal device, generates a resource allocation message and sends the resource allocation message by the second transceiver unit, and if the terminal device sends a fifth message, the second transceiver unit receives the fifth message to realize random access of the terminal device. Therefore, the success rate of the random access of the terminal equipment can be improved.
Description
Technical Field
The present disclosure relates generally to the field of mobile communications, and in particular, to a terminal device and an access network device for enhancing random access.
Background
Wireless communication networks often include one or more Access nodes (e.g., base stations) that require a User Equipment (UE) to synchronize with an uplink of the wireless communication network via a Random Access Procedure (Random Access Procedure) before uplink transmission can occur. There are a number of scenarios in a wireless communication system that may trigger a random access procedure, such as when a UE in an idle state attempts to transmit uplink data. Currently, the random access procedure is generally that all UEs use the same processing scheme, for example, in the random access procedure of 5G fifth generation mobile communication technology (5th generation mobile networks), the MSG3, the MSG4, and the MSG5 generally use the same power control method and resource allocation policy.
However, in a real wireless communication network, characteristics such as signal strength of edge UEs and center UEs are often different due to differences in distances between the UEs and the base station. In this case, problems may arise with the same processing scheme. For example, when the central UE is close to the base station, a signal burst exceeding the linear range of the base station receiver is generated, which causes an uplink decoding error, and even if the edge UE reaches the maximum transmission power, it is difficult to ensure the uplink reception power, which increases the error rate. Therefore, the success rate of random access is lowered.
Disclosure of Invention
The present disclosure has been made in view of the above-described state of the art, and an object thereof is to provide a terminal device and an access network device for enhancing random access, which can improve the success rate of random access.
To this end, a first aspect of the present disclosure provides a terminal device for enhancing random access, where the terminal device includes a first processing unit and a first transceiver unit, the first processing unit generates a first message and sends the first message to the first transceiver unit, the first transceiver unit sends the first message to an access network device, if the access network device receives the first message and generates a plurality of second messages including distance information and resource allocation information corresponding to respective transmission resources, respectively, based on a plurality of transmission resources that are generated in advance and configured with distance information and the first message, the first transceiver unit transmits the plurality of received second messages from the access network device to the first processing unit, the first processing unit calculates a target path loss and selects, from the plurality of second messages, a second message that meets a preset requirement as a target second message based on the target path loss, then generating a third message and sending the third message to the first transceiver unit, where the first transceiver unit sends the third message to the access network device according to resource allocation information in a second message of the target, where the preset requirement is that the target path loss is within a path loss range corresponding to distance information of the second message, if the access network device receives the third message and generates a fourth message, then sends the fourth message according to distance information corresponding to a sending resource matched with the third message and takes the distance information as target distance information of the terminal device, the first transceiver unit transmits the received fourth message from the access network device to the first processing unit, and the first processing unit determines whether an interference solution ID in the fourth message is equal to the third message, and if the interference solution ID is equal to the third message, the first processing unit generates a confirmation message and sends the confirmation message to the first transceiver unit, the first transceiver unit sends the confirmation message to the access network device, if the access network device receives the confirmation message and allocates resources for receiving a fifth message according to the target distance information of the terminal device, and then sends a resource allocation message, the first transceiver unit transmits the received resource allocation message from the access network device to the first processing unit, the first processing unit generates the fifth message and sends the fifth message to the first transceiver unit, and the first transceiver unit sends the fifth message to the access network device to realize random access. In this case, the access network device can obtain the distance information of the terminal device as early as possible and allocate corresponding resources based on the distance information. Therefore, the success rate of random access of the terminal equipment can be improved, and the resources after the random access channel collision are increased.
In addition, in the terminal device according to the first aspect of the present disclosure, optionally, the access network device obtains a corresponding resource selection policy configured with resource allocation information based on the target distance information of the terminal device, and sends the fourth message and allocates resources for receiving the fifth message based on the resource selection policy, where the resource allocation information of the resource selection policy includes at least one of a modulation and coding policy, a time domain allocation, and a frequency domain allocation. In this case, the access network device can transmit the fourth message and allocate resources for receiving the fifth message based on the distance information of the terminal device. Therefore, the success rate of the terminal device for receiving the fourth message can be improved, and the success rate of the access network device for receiving the fifth message can be increased.
In addition, in the terminal device according to the first aspect of the present disclosure, optionally, if the fourth message is sent based on the resource selection policy, the resource selection policy further includes a downlink power burst; if the resource for receiving the fifth message is allocated based on the resource selection policy, the resource selection policy further includes transmit power adjustment. Therefore, the success rate of the terminal device receiving the fourth message can be further improved, and the success rate of the access network device receiving the fifth message can be further increased.
A second aspect of the present disclosure provides an access network device for enhancing random access, where the access network device includes a second transceiver unit and a second processing unit, the second transceiver unit receives a first message from a terminal device and sends the first message to the second processing unit, the second processing unit generates, based on a plurality of transmission resources that are generated in advance and configured with distance information and the first message, a plurality of second messages that respectively correspond to the respective transmission resources and include distance information and resource allocation information corresponding to the respective transmission resources and send the second messages to the second transceiver unit, the second transceiver unit sends the second message to the terminal device, and if the terminal device calculates a target path loss and selects, based on the target path loss, a second message that meets a preset requirement from the plurality of second messages as a target second message, then the terminal device generates a third message and sends the third message according to resource allocation information in a second message of the target, the second transceiver unit transmits the received third message from the terminal device to the second processing unit, where the preset requirement is that the target path loss is within a path loss range corresponding to distance information of the second message, the second processing unit generates a fourth message and sends the fourth message to the second transceiver unit, the second transceiver unit sends the fourth message to the terminal device according to distance information corresponding to a sending resource matched with the third message and takes the distance information as target distance information of the terminal device, if the terminal device determines whether an interference solution ID in the fourth message is equal to the third message, if the interference solution ID is equal to the third message, generating a confirmation message and sending the confirmation message, the second transceiver unit receiving the confirmation message from the terminal device and sending the confirmation message to the second processing unit, the second processing unit allocating resources for receiving a fifth message according to the target distance information of the terminal device and sending a resource allocation message to the second transceiver unit, the second transceiver unit sending the resource allocation message to the terminal device, and if the terminal device generates the fifth message and sends the fifth message, the second transceiver unit receiving the fifth message from the terminal device to realize random access of the terminal device. In this case, the access network device can obtain the distance information of the terminal device as early as possible and allocate corresponding resources based on the distance information. Therefore, the success rate of random access of the terminal equipment can be improved, and the resources after the random access channel collision are increased.
In addition, in the access network device according to the second aspect of the present disclosure, optionally, the second processing unit obtains a corresponding resource selection policy configured with resource allocation information based on the target distance information of the terminal device, and sends the fourth message and allocates resources for receiving the fifth message based on the resource selection policy, where the resource allocation information of the resource selection policy includes at least one of a modulation and coding policy, a time domain allocation, and a frequency domain allocation. In this case, the access network device can transmit the fourth message and allocate resources for receiving the fifth message based on the distance information of the terminal device. Therefore, the success rate of the terminal device for receiving the fourth message can be improved, and the success rate of the access network device for receiving the fifth message can be increased.
In addition, in the access network device according to the second aspect of the present disclosure, optionally, if the fourth message is sent based on the resource selection policy, the resource selection policy further includes a downlink power burst; if the resource for receiving the fifth message is allocated based on the resource selection policy, the resource selection policy further includes transmit power adjustment. Therefore, the success rate of the terminal device receiving the fourth message can be further improved, and the success rate of the access network device receiving the fifth message can be further increased.
In addition, in the terminal device according to the first aspect of the present disclosure and the access network device according to the second aspect of the present disclosure, optionally, the first message includes a preamble sequence, and the fourth message and the fifth message are scheduled by downlink control information.
In addition, in the terminal device according to the first aspect of the present disclosure and the access network device according to the second aspect of the present disclosure, optionally, the second message is an RAR message and is scheduled by downlink control information, and the access network device transmits the distance information by using a reserved bit of the downlink control information. Thus, compatibility can be maintained.
In addition, in the terminal device according to the first aspect of the present disclosure and the access network device according to the second aspect of the present disclosure, optionally, the target path loss is obtained based on a reference signal transmission power of the access network device and a reference signal reception power of the terminal device. Thereby, a target path loss can be obtained to select the second message based on the target path loss.
In addition, in the terminal device according to the first aspect of the present disclosure and the access network device according to the second aspect of the present disclosure, optionally, a lower path loss boundary and an upper path loss boundary are obtained based on the distance information, and the path loss range is an interval corresponding to the lower path loss boundary and the upper path loss boundary.
According to the disclosure, a terminal device and an access network device for enhancing random access capable of improving the success rate of random access are provided.
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Embodiments of the present disclosure will now be explained in further detail, by way of example only, with reference to the accompanying drawings, in which:
fig. 1 is a schematic diagram illustrating an application scenario of random access by a terminal device according to an example of the present disclosure.
Fig. 2 is a block diagram illustrating a communication system to which an example of the present disclosure relates.
Fig. 3 is a block diagram illustrating a terminal device for enhanced random access according to an example of the present disclosure.
Fig. 4 is a block diagram illustrating an enhanced random access network apparatus to which examples of the present disclosure relate.
Fig. 5 is a flow chart illustrating an enhanced random access method according to an example of the present disclosure.
Fig. 6 is an interaction diagram illustrating an enhanced random access method according to an example of the present disclosure.
Detailed Description
Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. The drawings are schematic and the ratio of the dimensions of the components and the shapes of the components may be different from the actual ones. It should be noted that the terms "first," "second," "third," and "fourth," etc. in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The disclosure relates to a terminal device for enhancing random access, an access network device for enhancing random access and a communication system. The terminal equipment for enhancing random access, the access network equipment for enhancing random access and the communication system can enable the access network equipment to obtain the distance information of the terminal equipment as early as possible and allocate corresponding resources based on the distance information. Therefore, the success rate of Random Access of the terminal equipment can be improved, and the resources after Random Access Channel (RACH) collision are increased. The communication system related to the present disclosure may include a terminal device for enhanced random access and an access network device for enhanced random access. The present disclosure is described in detail below with reference to the attached drawings. In addition, the application scenarios described in the examples of the present disclosure are for more clearly illustrating the technical solutions of the present disclosure, and do not constitute a limitation on the technical solutions provided by the present disclosure.
The present disclosure relates to a terminal device for enhanced random access, an access network device for enhanced random access and a communication system, which can be used for 5G random access.
Fig. 1 is a schematic diagram illustrating an application scenario of random access by a terminal device according to an example of the present disclosure. Fig. 2 is a block diagram illustrating a communication system to which an example of the present disclosure relates. In some examples, as shown in fig. 2, communication system 1 may include a terminal device 10 and an access network device 20. In some examples, as shown in fig. 1, the terminal device 10 and the access network device 20 may interact through an enhanced random access method (described later) related to the present disclosure to synchronize the terminal device 10 with an uplink of the wireless communication network for uplink transmission. The enhanced random access method may be applied to the communication system 1.
In some examples, the terminal Device 10 may be a smartphone, a laptop Computer, a Personal Computer (PC), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), or other electronic devices. In some examples, the access network device 20 may be a base station. In some examples, the Base Station may be a Base Transceiver Station (BTS) in GSM or CDMA, a Base Station (NodeB) in WCDMA, and an evolved Node B (NodeB or eNB or e-NodeB) in LTE.
As described above, the communication system 1 may include the terminal device 10 and the access network device 20. Fig. 3 is a block diagram showing the terminal device 10 according to the example of the present disclosure. In some examples, as shown in fig. 3, the terminal device 10 may include a first transceiving unit 11 and a first processing unit 12. In some examples, the first transceiver unit 11 may be configured to receive a message sent by the access network device 20 and send the message to the access network device 20, and the first processing unit 12 may be configured to process the message sent by the access network device 20, that is, the first processing unit 12 may be configured to process the message received by the first transceiver unit 11. However, examples of the present disclosure are not limited thereto, and in other examples, the terminal device 10 may include any one or more units capable of implementing the corresponding functions of the first transceiving unit 11 and the first processing unit 12.
In some examples, first processing unit 12 may generate and send a first message (MSG1) to first transceiver unit 11, and first transceiver unit 11 may send the first message to access network device 20. In some examples, the first message may include a Preamble sequence (Preamble).
In some examples, if the access network device 20 receives the first message and generates the plurality of second messages (MSG2), the first transceiving unit 11 may transmit the plurality of second messages received from the access network device 20 to the first processing unit 12.
In addition, in some examples, the second message may be a RAR (Random Access Response) message scheduled by Downlink Control Information (DCI), such as DCI 1-0. In some examples, access network equipment 20 may utilize reserved bits of the downlink control information to send the distance information. Thus, compatibility can be maintained.
In addition, in some examples, the access network device 20 may generate a plurality of transmission resources in advance and configure distance information of each transmission resource, that is, the plurality of transmission resources are configured with the distance information. In some examples, the transmission resources and the range information may correspond one-to-one. In some examples, terminal device 10 may transmit a third message (described later) using the transmission resource.
In addition, in some examples, the distance intervals corresponding to the respective transmission resources may be acquired based on the distance information. In some examples, the distance may be represented by a path loss. In this case, the lower path loss boundary and the upper path loss boundary may be obtained based on the distance information, and the distance section (which may also be referred to as a path loss range) may be a section corresponding to the lower path loss boundary and the upper path loss boundary. Thus, the path loss range corresponding to the transmission resource can be specified by the distance information. In some examples, the distance information may include a lower loss bound and an upper loss bound. In some examples, if both the lower and upper path loss bounds are 0, it may indicate that the access network device 20 does not perform the enhanced random access process. In other examples, the distance information may include a loss start value and a loss length.
In addition, in some examples, the plurality of second messages may be generated based on the plurality of transmission resources and the first message, and each of the second messages may include distance information and resource allocation information corresponding to each of the transmission resources. In some examples, each second message may correspond to each transmission resource, i.e., the second messages may correspond to the transmission resources one to one. In this way, a plurality of second messages each corresponding to a different transmission resource and including distance information can be generated. In this case, a plurality of second messages are generated based on the first message to provide a plurality of transmission resources. This makes it possible to increase resources after Random Access Channel (RACH) collision.
In some examples, the resource allocation information may include a Modulation and Coding Scheme (MCS), a time domain allocation, and a frequency domain allocation. In some examples, the resource allocation information may also include a downlink power burst or a transmission power adjustment, where the downlink power burst may be used for message transmission from the access network device 20 to the terminal device 10, and the transmission power adjustment may be used for message transmission from the terminal device 10 to the access network device 20. In some examples, the second message may include an uplink scheduling grant (UL grant) that may include resource allocation information for indicating one transmission resource.
In some examples, the first processing unit 12 may calculate a target path loss and select a second message that satisfies a preset requirement as a target second message from the plurality of second messages based on the target path loss. In some examples, the first processing unit 12 may generate and send a third message (MSG3) to the first transceiving unit 11. In some examples, the first transceiver unit 11 may send the third message to the access network device 20 according to the resource allocation information in the targeted second message. In this case, the subsequent access network device 20 may obtain the distance information of the terminal device 10 based on the transmission resources used by the terminal device 10 to transmit the third message.
In addition, in some examples, the target path loss may be obtained based on the reference signal transmit power of access network device 20 and the reference signal receive power of terminal device 10. Thereby, a target path loss can be obtained to select the second message based on the target path loss. In some examples, the target path loss may be a difference between a reference signal transmit power of access network device 20 and a reference signal receive power of terminal device 10. In addition, in some examples, the reference signal transmission power may be transmitted by the base station to the terminal device 10 through System Information Block (SIB). In addition, in some examples, the reference signal received power may be measured by the terminal device 10. In addition, in some examples, the preset requirement may be that the target path loss is within a path loss range corresponding to the distance information of the second message. It should be noted that in other examples, there may be a second message sent by an old version of the access network device, and the second message does not include the distance information. In this case, the first processing unit 12 may send a third message to the old version of the access network device based on the second message.
Specifically, the first processing unit 12 may obtain a second message responding to the first message and determine whether distance information, such as a lower path loss boundary and an upper path loss boundary, exists in the second message, if so, determine whether a target path loss is within a path loss range corresponding to the distance information, if so, generate a third message and send the third message according to a corresponding sending resource obtained by the first transceiving unit 11 according to the resource allocation information in the second message, and if not, continue monitoring. In some examples, if the distance information does not exist in the second message, the third message is sent according to the resource allocation information in the second message. Thus, the method can be compatible with the access network equipment of the old version.
In some examples, if the access network device 20 receives the third message and generates a fourth message (MSG4), and then sends the fourth message, the first transceiving unit 11 may transmit the received fourth message from the access network device 20 to the first processing unit 12. In some examples, access network device 20 may transmit the fourth message according to the range information corresponding to the transmission resource matching the third message. In some examples, the transmission resource matched with the third message may be a transmission resource used by the terminal device 10 to transmit the third message. In this case, the distance information of the terminal device 10 can be obtained by the transmission resource that transmits the third message, and the distance of the terminal device 10 can be determined as early as possible. Thereby, an appropriate resource can be selected to transmit the fourth message. In some examples, the fourth message may be scheduled by downlink control information, e.g., DCI 1-0.
In addition, in some examples, access network device 20 may obtain a corresponding resource selection policy based on the target distance information of terminal device 10 and send a fourth message based on the resource selection policy. In some examples, the resource selection policy may be configured with resource allocation information. In some examples, the resource allocation information of the resource selection policy may include at least one of a modulation and coding policy, a time domain allocation, and a frequency domain allocation. In this case, the fourth message can be transmitted based on the distance information of the terminal device 10. Thereby, the success rate of the terminal device 10 receiving the fourth message can be improved. In some examples, the distance of terminal device 10 may be inversely related to the interference corresponding to the time domain allocation and the interference corresponding to the frequency domain allocation. That is, the farther the terminal device 10 is, the smaller the interference corresponding to the time domain and the frequency domain allocated by the access network device 20 is. In some examples, the distance of the terminal device 10 may be inversely related to the modulation and coding strategy. That is, the farther the terminal device 10 is located, the smaller the modulation and coding strategy that is employed.
In addition, in some examples, if the access network device 20 transmits the fourth message based on the resource selection policy, the resource selection policy may further include a downlink power burst (burst). That is, the access network device 20 transmits the fourth message with higher downlink power under the designated transmission resource. Thereby, the success rate of the terminal device 10 receiving the fourth message can be further improved. In some examples, the distance of the terminal device 10 may be positively correlated with the downlink power burst. That is, the farther the terminal device 10 is located, the higher the downlink power burst.
In addition, in some examples, distance information corresponding to a transmission resource matching the third message may be taken as target distance information of the terminal device 10. In some examples, access network device 20 may store target range information for terminal device 10. Therefore, the subsequent access network device 20 can adopt different resource allocation strategies based on the target distance information conveniently. Additionally, in some examples, the fourth message may include an interference resolution ID for feeding back dispute resolution information. In some examples, the third message may be taken as an interference resolution ID.
In some examples, the first processing unit 12 may determine whether the interference solution ID in the fourth message is equal to the third message, and several interference solution IDs are equal to the third message, then the first processing unit 12 may generate an Acknowledgement (ACK) and send the ACK to the first transceiving unit 11, and the first transceiving unit 11 sends the ACK to the access network device 20.
In some examples, if the access network device 20 receives the acknowledgement message and allocates resources for receiving the fifth message (MSG5) and then sends a resource allocation message, the first transceiving unit 11 may transmit the received resource allocation message from the access network device 20 to the first processing unit 12. In this case, the terminal device 10 can obtain the resource allocation message to indicate the resources for transmitting the fifth message (for the access network device 20, equivalent to the resources for receiving the fifth message). In some examples, after the access network device 20 receives the confirmation message, the resource for receiving the fifth message may be allocated according to the target distance information of the terminal device 10. Thereby, the success rate of the access network device 20 receiving the fifth message can be increased. In some examples, if the access network device 20 does not receive the fifth message, the resource for receiving the fifth message may be reallocated according to the target distance information of the terminal device 10 and a new resource allocation message may be sent.
In addition, in some examples, access network device 20 may obtain a corresponding resource selection policy based on the target distance information of terminal device 10 and allocate resources for receiving the fifth message based on the resource selection policy. Thereby, the success rate of receiving the fifth message by the access network device 20 can be improved. In some examples, the resource selection policy may further include a transmit power adjustment if the resource to receive the fifth message is allocated based on the resource selection policy. This can further increase the success rate of receiving the fifth message by the access network device 20. In some examples, the distance of the terminal device 10 may be positively correlated with the transmission power adjustment. That is, the farther the terminal device 10 is located, the larger the transmission power adjustment.
In some examples, the first processing unit 12 may generate and send a fifth message to the first transceiving unit 11, and the first transceiving unit 11 may send the fifth message to the access network device 20 to implement random access. In some examples, the fifth message may be scheduled by downlink control information, e.g., DCI 1-0.
By using the terminal device 10 of the present disclosure, the access network device 20 can obtain the distance information of the terminal device 10 as early as possible and allocate corresponding resources based on the distance information. Therefore, the success rate of the random access of the terminal device 10 can be improved, especially the success rate of the random access of the edge terminal device 10 is enhanced, and the resource after the random access channel collision is increased.
Fig. 4 is a block diagram illustrating an access network device 20 according to an example of the present disclosure. In some examples, as shown in fig. 4, the access network device 20 may include a second transceiving unit 21 and a second processing unit 22. In some examples, the second transceiver unit 21 may be configured to receive a message sent by the terminal device 10 and send the message to the terminal device 10, and the second processing unit 22 may be configured to process the message sent by the terminal device 10, that is, the second processing unit 22 may be configured to process the message received by the second transceiver unit 21. However, examples of the present disclosure are not limited thereto, and in other examples, the access network device 20 may include any one or more units capable of implementing the corresponding functions of the second transceiving unit 21 and the second processing unit 22.
In some examples, the second transceiving unit 21 may receive the first message from the terminal device 10 and send the first message to the second processing unit 22. In some examples, the second processing unit 22 may generate and send a plurality of second messages to the second transceiving unit 21, and the second transceiving unit 21 may send the second messages to the terminal device 10. In some examples, the first message may include a Preamble sequence (Preamble).
In addition, in some examples, the second processing unit 22 may generate a plurality of transmission resources in advance and configure distance information of each transmission resource, that is, the plurality of transmission resources are configured with the distance information. In some examples, second processing unit 22 may generate second messages respectively corresponding to the respective transmission resources based on the plurality of transmission resources and the first message, and each of the second messages may include distance information and resource allocation information corresponding to the respective transmission resource. In addition, in some examples, the distance intervals corresponding to the respective transmission resources may be acquired based on the distance information. In some examples, the distance may be represented by a path loss. In this case, the lower path loss boundary and the upper path loss boundary may be obtained based on the distance information, and the distance section (which may also be referred to as a path loss range) may be a section corresponding to the lower path loss boundary and the upper path loss boundary. Thus, the path loss range corresponding to the transmission resource can be specified by the distance information. The description about generation and transmission of the second message and transmission of the resource may refer to the description about generation and transmission of the second message by the access network device 20 involved in the terminal device 10 described above.
In addition, in some examples, the second message may be a RAR (Random Access Response) message scheduled by Downlink Control Information (DCI), such as DCI 1-0. In some examples, the second transceiving unit 21 may transmit the distance information using reserved bits of the downlink control information. Thus, compatibility can be maintained.
In some examples, if the terminal device 10 calculates a target path loss and selects a second message that satisfies a preset requirement as a target from a plurality of second messages based on the target path loss, and then generates a third message and transmits the third message, the second transceiving unit 21 may transmit the received third message from the terminal device 10 to the second processing unit 22. In some examples, terminal device 10 may send the third message according to the resource allocation information in the targeted second message. In this case, the subsequent access network device 20 may obtain the distance information of the terminal device 10 based on the transmission resource for transmitting the third message. In addition, in some examples, the target path loss may be obtained based on the reference signal transmit power of access network device 20 and the reference signal receive power of terminal device 10. Thereby, a target path loss can be obtained to select the second message based on the target path loss. In addition, in some examples, the preset requirement may be that the target path loss is within a path loss range corresponding to the distance information of the second message. The relevant description may refer to the description of generating and transmitting the third message referred to in the terminal device 10 described above.
In some examples, the second processing unit 22 may generate and transmit a fourth message to the second transceiving unit 21, and the second transceiving unit 21 may transmit the fourth message to the terminal device 10. In some examples, the second transceiving unit 21 may transmit the fourth message to the terminal device 10 according to the distance information corresponding to the transmission resource matched with the third message. Thereby, the distance of the terminal device 10 can be determined as early as possible. In some examples, the second transceiving unit 21 may use the distance information as the target distance information of the terminal device 10. In some examples, the fourth message may be scheduled by downlink control information, e.g., DCI 1-0. The related description may refer to the description of generating and transmitting the fourth message referred to in the terminal device 10 described above.
In addition, in some examples, the second processing unit 22 may obtain a corresponding resource selection policy based on the target distance information of the terminal device 10 and transmit the fourth message based on the resource selection policy. In some examples, the resource selection policy may be configured with resource allocation information. In some examples, the resource allocation information of the resource selection policy may include at least one of a modulation and coding policy, a time domain allocation, and a frequency domain allocation. In this case, the fourth message can be transmitted based on the distance information of the terminal device 10. Thereby, the success rate of the terminal device 10 receiving the fourth message can be improved. Additionally, in some examples, if the second processing unit 22 transmits the fourth message based on the resource selection policy, the resource selection policy may further include a downlink power burst (burst). That is, the second processing unit 22 transmits the fourth message with higher downlink power under the designated transmission resource. Thereby, the success rate of the terminal device 10 receiving the fourth message can be further improved. The relevant description may refer to the description relating to the resource selection policy in the terminal device 10 described above.
In some examples, if the terminal device 10 determines whether the interference solution ID in the fourth message is equal to the third message, and generates and transmits an acknowledgement message in the case where the interference solution ID is equal to the third message, the second transceiving unit 21 may receive the acknowledgement message from the terminal device 10 and transmit the acknowledgement message to the second processing unit 22. The relevant description may refer to the description of generating and sending the acknowledgement message referred to in the above description of the terminal device 10.
In some examples, the second processing unit 22 may allocate resources for receiving the fifth message and send a resource allocation message to the second transceiving unit 21. In some examples, the second transceiving unit 21 may transmit the resource allocation message to the terminal device 10. That is, the resource for receiving the fifth message is allocated and the terminal device 10 is notified. Thereby, the terminal device 10 can obtain the resource allocation message. In some examples, the resource allocation message includes resource allocation information for transmission resources used to transmit the fifth message. In some examples, the resource allocation message may be scheduled by downlink control information.
In some examples, the second processing unit 22 may allocate a resource for receiving the fifth message according to the target distance information of the terminal device 10. Thereby, the success rate of the access network device 20 receiving the fifth message can be increased. In addition, in some examples, access network device 20 may obtain a corresponding resource selection policy based on the target distance information of terminal device 10 and allocate resources for receiving the fifth message based on the resource selection policy. Thereby, the success rate of receiving the fifth message by the access network device 20 can be improved. In some examples, the resource selection policy may further include a transmit power adjustment if the resource to receive the fifth message is allocated based on the resource selection policy. This can further increase the success rate of receiving the fifth message by the access network device 20. The relevant description may refer to the description above describing the generation and transmission of the resource allocation message involved in the terminal device 10.
In some examples, if the terminal device 10 generates the fifth message and transmits the fifth message, the second transceiving unit 21 may receive the fifth message from the terminal device 10 to implement the random access of the terminal device 10. In some examples, the fifth message may be scheduled by downlink control information, e.g., DCI 1-0.
With the access network device 20 of the present disclosure, it is possible to obtain the distance information of the terminal device 10 as early as possible and allocate corresponding resources based on the distance information. Therefore, the success rate of the random access of the terminal device 10 can be improved, especially the success rate of the random access of the edge terminal device 10 is enhanced, and the resource after the random access channel collision is increased.
As described above, a terminal device 10 and an access network device 20 may interact through the enhanced random access method, and specific steps may be described in detail with reference to fig. 5. Fig. 5 is a flow chart illustrating an enhanced random access method according to an example of the present disclosure. Fig. 6 is an interaction diagram illustrating an enhanced random access method according to an example of the present disclosure.
In some examples, as shown in fig. 5, the enhanced random access method may include the terminal device 10 transmitting a first message (step S100). In step S100, the terminal device 10 may generate a first message and transmit the first message. The relevant description may refer to the description of generating and sending the first message referred to in the terminal device 10 described above.
In some examples, as shown in fig. 5, the enhanced random access method may include the access network device 20 generating a plurality of second messages including different resource information and transmitting the second messages (step S110). In step S110, the access network device 20 may receive the first message and generate a plurality of second messages. In some examples, access network device 20 may pre-generate a plurality of transmission resources and configure distance information for each transmission resource. In some examples, access network device 20 may generate a plurality of second messages respectively corresponding to the respective transmission resources based on the plurality of transmission resources and the first message, and each of the second messages may include distance information and resource allocation information corresponding to the respective transmission resources. The description about generation and transmission of the second message and transmission of the resource may refer to the description about generation and transmission of the second message by the access network device 20 involved in the terminal device 10 described above.
In some examples, as shown in fig. 5, the enhanced random access method may include the terminal device 10 selecting a target second message from the plurality of second messages and transmitting a third message based on the target second message (step S120). In step S120, the terminal device 10 may calculate a target path loss and select a second message that satisfies a preset requirement as a target second message from the plurality of second messages based on the target path loss, and then the terminal device 10 generates a third message and transmits the third message. In some examples, terminal device 10 may send the third message according to the resource allocation information in the targeted second message. In some examples, the preset requirement may be that the target path loss is within a path loss range corresponding to the distance information of the second message. The relevant description may refer to the description of generating and transmitting the third message referred to in the terminal device 10 described above.
In some examples, as shown in fig. 5, the enhanced random access method may include the access network device 20 obtaining the distance information of the terminal device 10 according to the third message and transmitting a fourth message based on the distance information (step S130). In step S130, the access network device 20 may receive the third message and generate a fourth message, and in some examples, the access network device 20 may transmit the fourth message according to the distance information corresponding to the transmission resource matched with the third message. In some examples, the access network device 20 may use the distance information corresponding to the transmission resource matched with the third message as the target distance information of the terminal device 10. The related description may refer to the description of generating and transmitting the fourth message referred to in the terminal device 10 described above.
In some examples, as shown in fig. 5, the enhanced random access method may include the terminal device 10 judging an interference solution ID and transmitting an acknowledgement message (step S140). In step S140, the terminal device 10 may determine whether the interference solution ID in the fourth message is equal to the third message, generate an acknowledgement message and transmit the acknowledgement message in the case where the interference solution ID is equal to the third message. The relevant description may refer to the description of generating and sending the acknowledgement message referred to in the above description of the terminal device 10.
In some examples, as shown in fig. 5, the enhanced random access method may include the access network device 20 allocating resources for receiving the fifth message according to the distance information corresponding to the terminal device 10 and transmitting a resource allocation message (step S150). As described above, the access network device 20 may use the distance information corresponding to the transmission resource matching the third message as the target distance information of the terminal device 10, and in step S150, the access network device 20 may receive the acknowledgement message and allocate a resource for receiving the fifth message, and then transmit the resource allocation message. In some examples, access network device 20 may allocate resources for receiving the fifth message according to the target distance information of terminal device 10. The relevant description may refer to the description above describing the generation and transmission of the resource allocation message involved in the terminal device 10.
In some examples, as shown in fig. 5, the enhanced random access method may include the terminal device 10 transmitting a fifth message to implement random access (step S160). In step S160, the terminal device 10 may generate a fifth message and transmit the fifth message to implement random access of the terminal device 10.
In some examples, a process of interaction between the terminal device 10 and the access network device 20 by the enhanced random access method may be referred to fig. 6.
In the present disclosure, the enhanced random access method referred to above enables the access network device 20 to obtain the distance information of the terminal device 10 as early as possible and allocate corresponding resources based on the distance information. Therefore, the success rate of the random access of the terminal device 10 can be improved, especially the success rate of the random access of the edge terminal device 10 is enhanced, and the resource after the random access channel collision is increased.
In the present disclosure, the enhanced random access method described above may be applied to, for example, the communication system 1 shown in fig. 1. The communication system 1 may comprise a terminal device 10 and an access network device 20 (see fig. 1). In this case, the enhanced random access method to which the present disclosure relates may be applied to the terminal device 10 of the communication system 1, or the enhanced random access method may be applied to the access network device 20 of the communication system 1. In other words, the enhanced random access method to which the present disclosure relates may be an enhanced random access method applied to the terminal device 10 or an enhanced random access method applied to the access network device 20.
In some examples, all or part of the steps in the enhanced random access method may be performed by associated hardware instructed by a program (instructions) that may be stored in a computer-readable memory (storage medium), which may include: flash disks, Read-Only memories (ROMs), Random Access Memories (RAMs), magnetic or optical disks, and the like.
While the present disclosure has been described in detail in connection with the drawings and examples, it should be understood that the above description is not intended to limit the disclosure in any way. Those skilled in the art can make modifications and variations to the present disclosure as needed without departing from the true spirit and scope of the disclosure, which fall within the scope of the disclosure.
Claims (10)
1. A terminal device for enhancing random access, the terminal device comprising a first processing unit and a first transceiver unit, the first processing unit generating a first message and sending the first message to the first transceiver unit, the first transceiver unit sending the first message to an access network device, if the access network device receives the first message and generates a plurality of second messages including distance information and resource allocation information corresponding to each transmission resource, respectively, based on a plurality of transmission resources configured with distance information and the first message, the first transceiver unit transmitting the plurality of received second messages from the access network device to the first processing unit, the first processing unit calculating a target path loss and selecting a second message satisfying a preset requirement as a target second message from the plurality of second messages based on the target path loss, then generating a third message and sending the third message to the first transceiver unit, where the first transceiver unit sends the third message to the access network device according to resource allocation information in a second message of the target, where the preset requirement is that the target path loss is within a path loss range corresponding to distance information of the second message, if the access network device receives the third message and generates a fourth message, then sends the fourth message according to distance information corresponding to a sending resource matched with the third message and takes the distance information as target distance information of the terminal device, the first transceiver unit transmits the received fourth message from the access network device to the first processing unit, and the first processing unit determines whether an interference solution ID in the fourth message is equal to the third message, and if the interference solution ID is equal to the third message, the first processing unit generates a confirmation message and sends the confirmation message to the first transceiver unit, the first transceiver unit sends the confirmation message to the access network device, if the access network device receives the confirmation message and allocates resources for receiving a fifth message according to the target distance information of the terminal device, and then sends a resource allocation message, the first transceiver unit transmits the received resource allocation message from the access network device to the first processing unit, the first processing unit generates the fifth message and sends the fifth message to the first transceiver unit, and the first transceiver unit sends the fifth message to the access network device to realize random access.
2. The terminal device of claim 1,
and the access network equipment acquires a corresponding resource selection strategy configured with resource allocation information based on the target distance information of the terminal equipment, transmits the fourth message based on the resource selection strategy and allocates resources for receiving the fifth message, wherein the resource allocation information of the resource selection strategy comprises at least one of a modulation and coding strategy, time domain allocation and frequency domain allocation.
3. The terminal device of claim 2,
if the fourth message is sent based on the resource selection strategy, the resource selection strategy also comprises a downlink power burst; if the resource for receiving the fifth message is allocated based on the resource selection policy, the resource selection policy further includes transmit power adjustment.
4. An access network device for enhancing random access, the access network device comprising a second transceiver unit and a second processing unit, the second transceiver unit receiving a first message from a terminal device and sending the first message to the second processing unit, the second processing unit generating a plurality of second messages including distance information and resource allocation information corresponding to respective transmission resources and respectively corresponding to the respective transmission resources based on a plurality of transmission resources pre-generated and configured with distance information and the first message and sending the second messages to the second transceiver unit, the second transceiver unit sending the second messages to the terminal device, if the terminal device calculates a target path loss and selects a second message satisfying a preset requirement as a second message of a target from the plurality of second messages based on the target path loss, then the terminal device generates a third message and sends the third message according to resource allocation information in a second message of the target, the second transceiver unit transmits the received third message from the terminal device to the second processing unit, where the preset requirement is that the target path loss is within a path loss range corresponding to distance information of the second message, the second processing unit generates a fourth message and sends the fourth message to the second transceiver unit, the second transceiver unit sends the fourth message to the terminal device according to distance information corresponding to a sending resource matched with the third message and takes the distance information as target distance information of the terminal device, if the terminal device determines whether an interference solution ID in the fourth message is equal to the third message, if the interference solution ID is equal to the third message, generating a confirmation message and sending the confirmation message, the second transceiver unit receiving the confirmation message from the terminal device and sending the confirmation message to the second processing unit, the second processing unit allocating resources for receiving a fifth message according to the target distance information of the terminal device and sending a resource allocation message to the second transceiver unit, the second transceiver unit sending the resource allocation message to the terminal device, and if the terminal device generates the fifth message and sends the fifth message, the second transceiver unit receiving the fifth message from the terminal device to realize random access of the terminal device.
5. The access network device of claim 4,
the second processing unit obtains a corresponding resource selection policy configured with resource allocation information based on the target distance information of the terminal device, and sends the fourth message and allocates resources for receiving the fifth message based on the resource selection policy, wherein the resource allocation information of the resource selection policy includes at least one of a modulation and coding policy, a time domain allocation and a frequency domain allocation.
6. The access network device of claim 5,
if the fourth message is sent based on the resource selection strategy, the resource selection strategy also comprises a downlink power burst; if the resource for receiving the fifth message is allocated based on the resource selection policy, the resource selection policy further includes transmit power adjustment.
7. The terminal device according to any of claims 1-3 or the access network device according to any of claims 4-6,
the first message comprises a preamble sequence, and the fourth message and the fifth message are scheduled by downlink control information.
8. The terminal device according to any of claims 1-3 or the access network device according to any of claims 4-6,
and the second message is an RAR message and is scheduled by downlink control information, and the access network equipment utilizes the reserved bit of the downlink control information to send the distance information.
9. The terminal device according to any of claims 1-3 or the access network device according to any of claims 4-6,
the target path loss is obtained based on the reference signal transmission power of the access network device and the reference signal reception power of the terminal device.
10. The terminal device according to any of claims 1-3 or the access network device according to any of claims 4-6,
and obtaining a lower road loss boundary and an upper road loss boundary based on the distance information, wherein the road loss range is an interval corresponding to the lower road loss boundary and the upper road loss boundary.
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| CN202210433318.3A CN114828285A (en) | 2021-03-20 | 2021-03-20 | Method for enhancing random access, terminal equipment and access network equipment |
| CN202110298818.6A CN113068272B (en) | 2021-03-20 | 2021-03-20 | Terminal equipment for enhancing random access and access network equipment |
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| CN115002928A (en) | 2022-09-02 |
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