WO2021128353A1 - Random access method and network node - Google Patents

Abstract

Disclosed are a random access method and a network node, related to the technical field of radio communication, capable of balancing a network load. In the present application, a network node (such as a first node) about to launch a random access request to a second node, combined with a guard time (GT) (such as a first GT) of an uplink signal acquired by the first node from a second node, can determine a random access type of a mobile phone on the basis of a first TA acquired by a first node. By means of such method, the first node is allowed to determine the random access type on the basis of the actual condition of a network, thus solving the problem of a conventional random access type determination method causing network overload, resulting in network congestion, and impacting user experience.

Description

Random access method and network node Technical field

The embodiments of the present application relate to the field of wireless communication technologies, and in particular, to a random access method and a network node.

Background technique

Random access is a necessary process for establishing wireless links between nodes in the network (such as between mobile phones and base stations). When an existing network node (such as the first node) initiates random access, it usually adopts the four-step random access (4-step random access channel, 4-step RACH) method shown in (a) in Figure 1 or Figure 1 (b) shows a two-step random access (2-step RACH) method to access another network node (such as the second node).

Among them, as shown in Figure 1, the difference between 4-step RACH and 2-step RACH is that in 4-step RACH, the first node needs to send a physical random access channel (PRACH) preamble to the second node. Code (preamble). Then the second node estimates the timing advance (TA) of the first node by detecting the PRACH preamble, and sends the estimated TA and the authorization information of the second node to the message 3 (Msg3) through the random access response message (ie Msg2). ) Feedback to the first node. Then, according to the received TA and Msg3 authorization information, it sends an uplink shared channel (physical uplink shared channel, PUSCH) carrying uplink data to the second node (Msg3 as shown in (a) in FIG. 1). In the 2-step RACH, the first node can simultaneously send an uplink signal carrying PRACH preamble and PUSCH to the second node (MsgA as shown in (b) in Figure 1).

Before a conventional first node initiates a random access request, it will first determine according to the random access type configured by the network device for the first node and the reference signal received rower (RSRP) received by the first node The random access type of the first node. For example, if the network device configures a 2-step RACH for the first node, and the RSRP meets a preset threshold, the first node uses the 2-step RACH method to access the second node. However, when the mobile phones managed by the access network equipment are in positions with good signal quality, all mobile phones with the random access type configured as 2-step RACH will use the 2-step RACH method to simultaneously access the access network equipment.

This may cause excessive load, which may further cause network congestion and affect user experience.

Summary of the invention

This application provides a random access method and network node, which can balance network load.

The embodiments of this application adopt the following technical solutions:

In a first aspect, a random access method is provided. The method includes: a first node obtains a first timing advance TA; A broadcast message of the first guard time GT; and, the first node determines the random access type of the first node according to the first GT and the first TA; wherein the random access type is two-step random access or four-step random access Access.

In the technical solution provided by the above first aspect, the first node determines the random access type of the first node by combining the TA obtained by the first node for sending the uplink signal and the GT obtained by the first node from the second node. It solves the problem that the conventional random access technology easily causes the second node to be overloaded, causes network congestion, and responds to the problem that affects the user experience.

With reference to the first aspect, in a possible implementation manner, the first node determining the random access type of the first node according to the first GT and the first TA includes: the first node determining whether the first TA is greater than the first GT ; If the first TA is greater than the first GT, the first node determines that the random access type of the first node is four-step random access. The first node determines that the first TA is greater than the first GT, which indicates that the first GT cannot guarantee to avoid mutual interference between uplink signals in the two-step random access. In order to avoid the problem of mutual interference between uplink signals from different first nodes on the base station side, in this case, the first node will choose four-step random access. In order to solve the problem that the conventional random access technology is likely to cause the second node to be overloaded, cause network congestion, and respond to the problem that affects the user experience.

With reference to the first aspect, in a possible implementation manner, if the first TA is less than or equal to the foregoing first GT, the foregoing method further includes: the first node determines that the random access type of the first node is two-step random access . The first node determines that the first TA is less than or equal to the first GT, which means that the guard interval provided by the first GT can overcome the problem of uplink signal mutual interference on the second node side caused by the first node not sending uplink signals in advance. In this case, the first node will choose two-step random access. In order to solve the problem that the conventional random access technology is likely to cause the second node to be overloaded, cause network congestion, and respond to the problem that affects the user experience.

With reference to the first aspect, in a possible implementation manner, if the first TA is less than or equal to the foregoing first GT, the foregoing method further includes: the first node determines whether the received power of the reference signal received by the first node is greater than the reference signal Received power RSRP threshold; if the received power of the reference signal received by the first node is greater than the RSRP threshold, the first node determines that the random access type of the first node is two-step random access; if the reference signal received by the first node The received power of is less than or equal to the RSRP threshold, and the first node determines that the random access type of the first node is four-step random access. When the first node determines that the first TA is less than or equal to the first GT, in order to further improve the accuracy of the first node in determining the random access type, the first node can also introduce RSRP judgment conditions, and further determine whether to use two-step random access Entry is still four-step random access.

With reference to the first aspect, in a possible implementation manner, before the first node determines whether the first TA is greater than the first GT, the above method further includes: the first node determines the received power of the reference signal received by the first node Whether it is greater than the RSRP threshold of the reference signal received power; and, the first node determines that the received power of the reference signal received by the first node is greater than the RSRP threshold. In order to further improve the accuracy of the first node in determining the random access type, the first node may also introduce RSRP judgment conditions. Specifically, the judgment condition of judging whether the first TA is greater than the first GT is actually performed after the first node determines that the received power of the reference signal received by the first node is greater than the RSRP threshold.

With reference to the first aspect, in a possible implementation manner, the above-mentioned first TA is calculated by the first node according to the first position information; wherein, the first position information is used to characterize the relationship between the first node and the second node. distance. Through this method, the problem of mutual interference between multiple uplink signals from multiple first nodes at the second node side caused by the failure to negotiate and determine the TA value when the two-step random access is initiated in the conventional technology can be solved.

With reference to the first aspect, in a possible implementation manner, the above-mentioned first position information is based on the measurement result of the positioning reference signal PRS by the first node, the arrival time TOA of the measured received signal, the demodulation reference signal DMRS, and the sounding reference signal At least one of SRS, synchronization signal and physical broadcast channel block SSB or channel state information CSI is determined. The present application does not limit the positioning method used to obtain the first position information, for example, it may be obtained according to at least one of PRS, TOA, DMRS, SRS, SSB, or CSI.

With reference to the first aspect, in a possible implementation manner, the measurement result of the PRS by the first node is obtained by measuring multiple PRSs by the first node; wherein the measurement result of the PRS by the first node includes one of the following information or Multiple: Reference signal received power RSRP, reference signal received quality RSRQ, reference signal time difference RSTD, narrowband reference signal received power NRSRP or narrowband reference signal received quality NRSRQ. This application does not limit the specific content of the measurement result reported by the first node for positioning the first node, for example, it may be at least one of RSRP, RSRQ, RSTD, NRSRP, or NRSRQ.

With reference to the first aspect, in a possible implementation manner, the first node acquiring the first timing advance TA includes: the first node acquiring the second timing advance TA and the second position information; the first node compares the first The location information and the second location information; if the distance between the location indicated by the first location information and the location indicated by the second location information is less than a preset threshold, the first node determines that the first TA is the second TA. Wherein, the second location information is the last location information of the first node saved by the first node before the first node enters the idle state from the connected state; the second TA is the first node before the first node enters the idle state from the connected state. The last one used by the first node saved by a node and the time advance corresponding to the second location information. After the first node determines that the location of the first node has not moved or the range of movement is small, the first node can use the TA value determined last time by the first node as a basis for judging the random access type, which saves computing power.

With reference to the first aspect, in a possible implementation manner, the above-mentioned first location information is obtained by the first node from a positioning management device; wherein, the positioning management device includes either a positioning management network element LMF or a positioning management component LMC . The first location information in this application may be obtained based on positioning technology, and this application does not limit the structure of the location management device used to locate the first node. For example, the location management device may be an LMF or LMC. Either.

In a second aspect, a random access method is provided. The method includes: a first node obtains first location information used to characterize a distance between the first node and a second node; the first node according to the first location information, The first timing advance TA is calculated; the first node sends a random access request to the second node according to the first TA.

In the technical solution provided by the above second aspect, the first node obtains first location information used to characterize the distance between the first node and the second node, so as to initiate a random access request according to the first location information. Furthermore, when the two-step random access is initiated in the conventional technology, the TA value is not negotiated and determined, which causes the mutual interference of multiple uplink signals from multiple first nodes on the side of the second node.

With reference to the second aspect, in a possible implementation manner, the first location information obtained by the first node includes: the first node obtains the first location from the location management device by the location management device based on the location of the first node information. Through this method, the first location information can be obtained based on the positioning technology, so as to solve the problem that when the two-step random access in the conventional technology is initiated, the TA value is not negotiated and determined, resulting in multiple uplink signals from multiple first nodes in the first node. The problem of mutual interference between the two nodes.

With reference to the second aspect, in a possible implementation manner, before the first node calculates the first TA according to the first location information, the method further includes: the first node obtains the second timing advance TA and the second TA and the second TA. Location information; the first node calculates the first TA according to the first location information, including: the first node compares the first location information with the second location information; if the location indicated by the first location information and the location indicated by the second location information The distance of is less than the preset threshold, and the first node determines that the first TA is the second TA. Among them, the second location information is the last location information of the first node saved by the first node before the first node enters the idle state from the connected state; the second TA is the first node before the first node enters the idle state from the connected state. The last one used by the first node saved by the node, and the time advance corresponding to the second location information. After the first node determines that the location of the first node has not moved or the range of movement is small, the first node can use the TA value determined last time by the first node as a basis for judging the type of random access, which saves computing power.

With reference to the second aspect, in a possible implementation manner, the above method further includes: the first node receives a broadcast message from the second node; the broadcast message carries a first node used to determine the random access type of the first node. Guard time GT: The first node determines the random access type of the first node according to the first GT and the first TA; wherein, the above-mentioned random access type is two-step random access or four-step random access. The first node determines the random access type of the first node by combining the TA obtained by the first node for sending the uplink signal and the GT obtained by the first node from the second node. It solves the problem that the conventional random access technology easily causes the second node to be overloaded, causes network congestion, and responds to the problem that affects user experience.

With reference to the second aspect, in a possible implementation manner, the first node determining the random access type of the first node according to the first GT and the first TA includes: the first node determining whether the first TA is greater than the first TA A GT; if the first TA is greater than the first GT, the first node determines that the random access type of the first node is four-step random access. The first node determines that the first TA is greater than the first GT, which indicates that the first GT cannot guarantee to avoid mutual interference between uplink signals in the two-step random access. In order to avoid the problem of mutual interference between uplink signals from different first nodes on the base station side, in this case, the first node will choose four-step random access. In order to solve the problem that the conventional random access technology is likely to cause the second node to be overloaded, cause network congestion, and respond to the problem that affects the user experience.

With reference to the second aspect, in a possible implementation manner, the above method further includes: if the first TA is less than or equal to the first GT, the first node determines that the random access type of the first node is two-step random access. The first node determines that the first TA is less than or equal to the first GT, which means that the guard interval provided by the first GT can overcome the problem of uplink signal mutual interference on the second node side caused by the first node not sending uplink signals in advance. In this case, the first node will choose two-step random access. In order to solve the problem that the conventional random access technology is likely to cause the second node to be overloaded, cause network congestion, and respond to the problem that affects the user experience.

With reference to the second aspect, in a possible implementation manner, if the first TA is less than or equal to the first GT, the method further includes: the first node determines whether the received power of the reference signal received by the first node is greater than the reference Signal received power RSRP threshold; if the received power of the reference signal received by the first node is greater than the RSRP threshold, the first node determines that the random access type of the first node is two-step random access; if the first node receives The received power of the reference signal is less than or equal to the RSRP threshold, and the first node determines that the random access type of the first node is four-step random access. When the first node determines that the first TA is less than or equal to the first GT, in order to further improve the accuracy of the first node in determining the random access type, the first node can also introduce RSRP judgment conditions, and further determine whether to use two-step random access Entry is still four-step random access.

With reference to the second aspect, in a possible implementation manner, before the first node determines whether the first TA is greater than the first GT, the method further includes: the first node determines the received power of the reference signal received by the first node Whether it is greater than the RSRP threshold of the reference signal received power; and the first node determines that the received power of the reference signal received by the first node is greater than the RSRP threshold. In order to further improve the accuracy of the first node in determining the random access type, the first node may also introduce RSRP judgment conditions. Specifically, the judgment condition of judging whether the first TA is greater than the first GT is actually performed after the first node determines that the received power of the reference signal received by the first node is greater than the RSRP threshold.

With reference to the second aspect, in a possible implementation manner, the above-mentioned first position information is based on the measurement result of the positioning reference signal PRS by the first node, the measured arrival time TOA of the received signal, the demodulation reference signal DMRS, and the sounding reference signal At least one of SRS, synchronization signal and physical broadcast channel block SSB or channel state information CSI is determined. The present application does not limit the positioning method used to obtain the first position information, for example, it may be obtained according to at least one of PRS, TOA, DMRS, SRS, SSB, or CSI.

With reference to the second aspect, in a possible implementation manner, the measurement result of the PRS by the first node is obtained by measuring multiple PRSs by the first node; wherein the measurement result of the PRS by the first node includes one of the following information or Multiple: Reference signal received power RSRP, reference signal received quality RSRQ, reference signal time difference RSTD, narrowband reference signal received power NRSRP or narrowband reference signal received quality NRSRQ. This application does not limit the specific content of the measurement result reported by the first node for positioning the first node, for example, it may be at least one of RSRP, RSRQ, RSTD, NRSRP, or NRSRQ.

With reference to the second aspect, in a possible implementation manner, the foregoing location management device includes any one of a location management network element LMF or a location management component LMC. The first location information in this application may be obtained based on positioning technology, and this application does not limit the structure of the location management device used to locate the first node. For example, the location management device may be an LMF or LMC. Either.

In a third aspect, a random access method is provided. The method includes: a first node determines whether the received power of a reference signal received by the first node is greater than a reference signal received power RSRP threshold; If the received power is greater than the RSRP threshold, the first node obtains the first timing advance TA; the first node receives the broadcast message from the second node; the broadcast message carries the first guard time GT; the first GT is used to determine The random access type of the first node; the first node determines the random access type of the first node according to the first GT and the first TA; wherein, the random access type is two-step random access or four-step random access.

In the technical solution provided by the above third aspect, the first node determines whether to access the second node in a four-step random access mode by determining whether the received power of the reference signal received by the first node is greater than the RSRP threshold. Avoid the problem of resource and computing power wasted caused by obtaining the first TA when the second node should be accessed in the four-step random access mode. And, when the first node determines not to access the second node in a four-step random access mode, obtain first location information that is used to characterize the distance between the first node and the second node, so as to obtain the first location information according to the first location information Initiate a random access request. Furthermore, when the two-step random access is initiated in the conventional technology, the TA value is not negotiated and determined, which causes the mutual interference of multiple uplink signals from multiple first nodes on the side of the second node.

With reference to the third aspect, in a possible implementation manner, the above method further includes: if the received power of the reference signal received by the first node is less than or equal to the RSRP threshold, the first node determines the random access of the first node The type is four-step random access. Through this method, it is possible to avoid the problem of resource and computing power wasted caused by obtaining the first TA when the second node should be accessed in a four-step random access mode.

With reference to the third aspect, in a possible implementation manner, the first node determining the random access type of the first node according to the first GT and the first TA includes: the first node determining whether the first TA is greater than the first GT ; If the first TA is greater than the first GT, the first node determines that the random access type of the first node is four-step random access; if the first TA is less than or equal to the first GT, the first node determines the first node's The random access type is two-step random access. The first node determines that the first TA is greater than the first GT, which indicates that the first GT cannot guarantee to avoid mutual interference between uplink signals in the two-step random access. In order to avoid the problem of mutual interference between uplink signals from different first nodes on the base station side, in this case, the first node will choose four-step random access. The first node determines that the first TA is less than or equal to the first GT, which means that the guard interval provided by the first GT can overcome the problem of uplink signal mutual interference on the second node side caused by the first node not sending uplink signals in advance. In this case, the first node will choose two-step random access. In order to solve the problem that the conventional random access technology is likely to cause the second node to be overloaded, cause network congestion, and respond to the problem that affects the user experience.

With reference to the third aspect, in a possible implementation manner, the above-mentioned first TA is calculated by the first node according to the first position information used to characterize the distance between the first node and the second node. The first node acquires first location information used to characterize the distance between the first node and the second node, so as to initiate a random access request according to the first location information. Furthermore, when the two-step random access is initiated in the conventional technology, the TA value is not negotiated and determined, which causes the mutual interference of multiple uplink signals from multiple first nodes on the side of the second node.

With reference to the third aspect, in a possible implementation manner, the above-mentioned first position information is based on the measurement result of the positioning reference signal PRS by the first node, the arrival time TOA of the measured received signal, the demodulation reference signal DMRS, and the sounding reference signal At least one of SRS, synchronization signal and physical broadcast channel block SSB or channel state information CSI is determined. The present application does not limit the positioning method used to obtain the first position information, for example, it may be obtained according to at least one of PRS, TOA, DMRS, SRS, SSB, or CSI.

With reference to the third aspect, in a possible implementation manner, the measurement result of the PRS by the first node is obtained by measuring multiple PRSs by the first node; wherein the measurement result of the PRS by the first node includes one of the following information or Multiple: Reference signal received power RSRP, reference signal received quality RSRQ, reference signal time difference RSTD, narrowband reference signal received power NRSRP or narrowband reference signal received quality NRSRQ. This application does not limit the specific content of the measurement result reported by the first node for positioning the first node, for example, it may be at least one of RSRP, RSRQ, RSTD, NRSRP, or NRSRQ.

With reference to the third aspect, in a possible implementation manner, the first node acquiring the first timing advance TA includes: the first node acquiring the second timing advance TA and the second location information; the first node acquires the second timing advance TA and the second location information; The position information is calculated to obtain the first TA, including: the first node compares the first position information with the second position information; if the distance between the position indicated by the first position information and the position indicated by the second position information is less than a preset threshold, the first TA A node determines that the first TA is the second TA. Among them, the second location information is the last location information of the first node saved by the first node before the first node enters the idle state from the connected state; the second TA is the first node before the first node enters the idle state from the connected state. The last one used by the first node saved by the node, and the time advance corresponding to the second location information. After the first node determines that the location of the first node has not moved or the range of movement is small, the first node can use the TA value determined last time by the first node as a basis for judging the random access type, which saves computing power.

With reference to the third aspect, in a possible implementation manner, the above-mentioned first location information is obtained by the first node from a location management device; wherein, the location management device includes either a location management network element LMF or a location management component LMC . The first location information in this application may be obtained based on positioning technology, and this application does not limit the structure of the location management device used to locate the first node. For example, the location management device may be an LMF or LMC. Either.

In a fourth aspect, a first node is provided. The first node includes: a processing unit, configured to obtain a first timing advance TA; a receiving unit, configured to receive a broadcast message from a second node; the broadcast message carries useful information The first guard time GT for determining the random access type of the first node; the processing unit is further configured to determine the random access type of the first node according to the first GT and the first TA; wherein, the random access The type is two-step random access or four-step random access.

In the technical solution provided by the above fourth aspect, the first node determines the random access type of the first node by combining the TA obtained by the first node for sending the uplink signal and the GT obtained by the first node from the second node. It solves the problem that the conventional random access technology easily causes the second node to be overloaded, causes network congestion, and responds to the problem that affects user experience.

With reference to the fourth aspect, in a possible implementation manner, the foregoing processing unit determines the random access type of the first node according to the first GT and the first TA, including: the processing unit determines whether the first TA is greater than the first GT; if The first TA is greater than the foregoing first GT, and the processing unit determines that the random access type of the first node is four-step random access. The first node determines that the first TA is greater than the first GT, which indicates that the first GT cannot guarantee to avoid mutual interference between uplink signals in the two-step random access. In order to avoid the problem of mutual interference between uplink signals from different first nodes on the base station side, in this case, the first node will choose four-step random access. In order to solve the problem that the conventional random access technology is likely to cause the second node to be overloaded, cause network congestion, and respond to the problem that affects the user experience.

With reference to the fourth aspect, in a possible implementation manner, if the first TA is less than or equal to the foregoing first GT, the foregoing processing unit is further configured to determine that the random access type of the first node is two-step random access. The first node determines that the first TA is less than or equal to the first GT, which means that the guard interval provided by the first GT can overcome the problem of uplink signal mutual interference on the second node side caused by the first node not sending uplink signals in advance. In this case, the first node will choose two-step random access. In order to solve the problem that the conventional random access technology is likely to cause the second node to be overloaded, cause network congestion, and respond to the problem that affects the user experience.

With reference to the fourth aspect, in a possible implementation manner, if the first TA is less than or equal to the first GT, the processing unit is further configured to: determine whether the received power of the reference signal received by the first node is greater than the reference signal received Power RSRP threshold; if the received power of the reference signal received by the first node is greater than the RSRP threshold, the processing unit determines that the random access type of the first node is two-step random access; if the reference signal received by the first node is received If the power is less than or equal to the RSRP threshold, the processing unit determines that the random access type of the first node is four-step random access. When the first node determines that the first TA is less than or equal to the first GT, in order to further improve the accuracy of the first node in determining the random access type, the first node can also introduce RSRP judgment conditions, and further determine whether to use two-step random access Entry is still four-step random access.

With reference to the fourth aspect, in a possible implementation manner, before the first node determines whether the first TA is greater than the first GT, the processing unit is further configured to: determine the received power of the reference signal received by the first node Whether it is greater than the RSRP threshold of the reference signal received power; and the processing unit determines that the received power of the reference signal received by the first node is greater than the RSRP threshold. In order to further improve the accuracy of the first node in determining the random access type, the first node may also introduce RSRP judgment conditions. Specifically, the judgment condition of judging whether the first TA is greater than the first GT is actually performed after the first node determines that the received power of the reference signal received by the first node is greater than the RSRP threshold.

With reference to the fourth aspect, in a possible implementation manner, the above-mentioned first TA is calculated by the processing unit according to the first position information; wherein, the first position information is used to characterize the distance between the first node and the second node . Through this method, the problem of mutual interference between multiple uplink signals from multiple first nodes at the second node side caused by the failure to negotiate and determine the TA value when the two-step random access is initiated in the conventional technology can be solved.

With reference to the fourth aspect, in a possible implementation manner, the above-mentioned first position information is based on the measurement result of the positioning reference signal PRS by the first node, the measured arrival time TOA of the received signal, the demodulation reference signal DMRS, and the sounding reference signal At least one of SRS, synchronization signal and physical broadcast channel block SSB or channel state information CSI is determined. The present application does not limit the positioning method used to obtain the first position information, for example, it may be obtained according to at least one of PRS, TOA, DMRS, SRS, SSB, or CSI.

With reference to the fourth aspect, in a possible implementation manner, the measurement result of the PRS by the first node is obtained by measuring multiple PRSs by the first node; wherein the measurement result of the PRS by the first node includes one of the following information or Multiple: Reference signal received power RSRP, reference signal received quality RSRQ, reference signal time difference RSTD, narrowband reference signal received power NRSRP or narrowband reference signal received quality NRSRQ. This application does not limit the specific content of the measurement result reported by the first node for positioning the first node, for example, it may be at least one of RSRP, RSRQ, RSTD, NRSRP, or NRSRQ.

With reference to the fourth aspect, in a possible implementation manner, the first node further includes a storage unit; the processing unit acquiring the first timing advance TA includes: the processing unit acquiring the second timing advance TA and second location information The above processing unit is also used to compare the first position information and the second position information; if the distance between the position indicated by the first position information and the position indicated by the second position information is less than a preset threshold, the processing unit determines that the first TA is The second TA. Among them, the second location information is the last location information of the first node saved by the storage unit before the first node enters the idle state from the connected state; the second TA is the storage unit saves the first node before the first node enters the idle state from the connected state The last one used by the first node, and the timing advance corresponding to the second location information. After the first node determines that the location of the first node has not moved or the range of movement is small, the first node can use the TA value determined last time by the first node as a basis for judging the random access type, which saves computing power.

With reference to the fourth aspect, in a possible implementation manner, the above-mentioned first position information is obtained by the above-mentioned receiving unit from a positioning management device; wherein, the positioning management device includes either a positioning management network element LMF or a positioning management component LMC . The first location information in this application may be obtained based on positioning technology, and this application does not limit the structure of the location management device used to locate the first node. For example, the location management device may be an LMF or LMC. Either.

In a fifth aspect, a first node is provided. The first node includes: a receiving unit, configured to obtain first position information used to characterize the distance between the first node and the second node; and a processing unit, configured according to The first location information is calculated to obtain the first timing advance TA; the sending unit is configured to send a random access request to the second node according to the first TA.

In the technical solution provided by the above fifth aspect, the first node obtains first location information used to characterize the distance between the first node and the second node, so as to initiate a random access request according to the first location information. Furthermore, when the two-step random access is initiated in the conventional technology, the TA value is not negotiated and determined, which causes the mutual interference of multiple uplink signals from multiple first nodes on the side of the second node.

With reference to the fifth aspect, in a possible implementation manner, the first location information obtained by the receiving unit includes: the receiving unit obtains from the location management device the first location information obtained by the location management device based on the location of the first node. Through this method, the first location information can be obtained based on the positioning technology, so as to solve the problem that when the two-step random access in the conventional technology is initiated, the TA value is not negotiated and determined, resulting in multiple uplink signals from multiple first nodes in the first node. The problem of mutual interference between the two nodes.

With reference to the fifth aspect, in a possible implementation manner, the above-mentioned first node further includes: a storage unit; before the above-mentioned processing unit calculates the first TA according to the first position information, the above-mentioned processing unit is further configured to: Acquire the second timing advance TA and the second position information; the processing unit calculates the first TA according to the first position information, including: the processing unit compares the first position information with the second position information; if the position indicated by the first position information If the distance from the position indicated by the second position information is less than the preset threshold, the processing unit determines that the first TA is the second TA. Among them, the second location information is the last location information of the first node saved by the storage unit before the first node enters the idle state from the connected state; the second TA is the storage unit saves the first node before the first node enters the idle state from the connected state The last one used by the first node, and the timing advance corresponding to the second location information. After the first node determines that the location of the first node has not moved or the range of movement is small, the first node can use the TA value determined last time by the first node as a basis for judging the random access type, which saves computing power.

With reference to the fifth aspect, in a possible implementation manner, the above-mentioned receiving unit is further configured to receive a broadcast message from the second node; the broadcast message carries a first protection for determining the random access type of the first node Time GT; the above-mentioned processing unit is further configured to determine the random access type of the first node according to the first GT and the first TA; wherein, the above-mentioned random access type is two-step random access or four-step random access. The first node determines the random access type of the first node by combining the TA obtained by the first node for sending the uplink signal and the GT obtained by the first node from the second node. It solves the problem that the conventional random access technology easily causes the second node to be overloaded, causes network congestion, and responds to the problem that affects user experience.

With reference to the fifth aspect, in a possible implementation manner, the foregoing processing unit determines the random access type of the first node according to the first GT and the first TA, including: the processing unit determines whether the first TA is greater than the first GT ; If the first TA is greater than the first GT, the processing unit determines that the random access type of the first node is four-step random access. The first node determines that the first TA is greater than the first GT, which indicates that the first GT cannot guarantee to avoid mutual interference between uplink signals in the two-step random access. In order to avoid the problem of mutual interference between uplink signals from different first nodes on the base station side, in this case, the first node will choose four-step random access. In order to solve the problem that the conventional random access technology is likely to cause the second node to be overloaded, cause network congestion, and respond to the problem that affects the user experience.

With reference to the fifth aspect, in a possible implementation manner, if the first TA is less than or equal to the first GT, the above-mentioned fox cleaning unit is also used to determine that the random access type of the first node is two-step random access. The first node determines that the first TA is less than or equal to the first GT, which means that the guard interval provided by the first GT can overcome the problem of uplink signal mutual interference on the second node side caused by the first node not sending uplink signals in advance. In this case, the first node will choose two-step random access. In order to solve the problem that the conventional random access technology is likely to cause the second node to be overloaded, cause network congestion, and respond to the problem that affects the user experience.

With reference to the fifth aspect, in a possible implementation manner, if the first TA is less than or equal to the first GT, the processing unit is further configured to determine whether the received power of the reference signal received by the first node is greater than the reference signal The received power RSRP threshold; if the received power of the reference signal received by the first node is greater than the RSRP threshold, the processing unit determines that the random access type of the first node is two-step random access; if the reference signal received by the first node The received power of the signal is less than or equal to the RSRP threshold, and the processing unit determines that the random access type of the first node is four-step random access. When the first node determines that the first TA is less than or equal to the first GT, in order to further improve the accuracy of the first node in determining the random access type, the first node can also introduce RSRP judgment conditions, and further determine whether to use two-step random access Entry is still four-step random access.

With reference to the fifth aspect, in a possible implementation manner, before the first node determines whether the first TA is greater than the first GT, the processing unit is further configured to determine whether the received power of the reference signal received by the first node is Is greater than the RSRP threshold of the reference signal received power; and the processing unit determines that the received power of the reference signal received by the first node is greater than the RSRP threshold. In order to further improve the accuracy of the first node in determining the random access type, the first node may also introduce RSRP judgment conditions. Specifically, the judgment condition of judging whether the first TA is greater than the first GT is actually performed after the first node determines that the received power of the reference signal received by the first node is greater than the RSRP threshold.

With reference to the fifth aspect, in a possible implementation manner, the above-mentioned first position information is based on the measurement result of the positioning reference signal PRS by the first node, the arrival time TOA of the measured received signal, the demodulation reference signal DMRS, and the sounding reference signal At least one of SRS, synchronization signal and physical broadcast channel block SSB or channel state information CSI is determined. The present application does not limit the positioning method used to obtain the first position information, for example, it may be obtained according to at least one of PRS, TOA, DMRS, SRS, SSB, or CSI.

With reference to the fifth aspect, in a possible implementation manner, the measurement result of the PRS by the first node is obtained by measuring multiple PRSs by the first node; wherein the measurement result of the PRS by the first node includes one of the following information or Multiple: Reference signal received power RSRP, reference signal received quality RSRQ, reference signal time difference RSTD, narrowband reference signal received power NRSRP or narrowband reference signal received quality NRSRQ. This application does not limit the specific content of the measurement result reported by the first node for positioning the first node, for example, it may be at least one of RSRP, RSRQ, RSTD, NRSRP, or NRSRQ.

With reference to the fifth aspect, in a possible implementation manner, the foregoing location management device includes any one of a location management network element LMF or a location management component LMC. The first location information in this application may be obtained based on positioning technology, and this application does not limit the structure of the location management device used to locate the first node. For example, the location management device may be an LMF or LMC. Either.

In a sixth aspect, a first node is provided, the first node includes: a processing unit configured to determine whether the received power of a reference signal received by the first node is greater than a reference signal received power RSRP threshold; and, if the first node receives The received power of the reference signal is greater than the RSRP threshold, and the first timing advance TA is obtained; the receiving unit is used to receive the broadcast message from the second node; the broadcast message carries the first guard time GT; the first GT is used To determine the random access type of the first node; the above processing unit is further configured to determine the random access type of the first node according to the first GT and the first TA; wherein the random access type is two-step random access or four Step random access.

In the technical solution provided by the above sixth aspect, the first node determines whether to access the second node in a four-step random access mode by determining whether the received power of the reference signal received by the first node is greater than the RSRP threshold. Avoid the problem of resource and computing power wasted caused by obtaining the first TA when the second node should be accessed in the four-step random access mode. And, when the first node determines not to access the second node in a four-step random access mode, obtain first location information that is used to characterize the distance between the first node and the second node, so as to obtain the first location information according to the first location information Initiate a random access request. Furthermore, when the two-step random access is initiated in the conventional technology, the TA value is not negotiated and determined, which causes the mutual interference of multiple uplink signals from multiple first nodes on the side of the second node.

With reference to the sixth aspect, in a possible implementation manner, if the received power of the reference signal received by the first node is less than or equal to the RSRP threshold, the processing unit is further configured to determine that the random access type of the first node is Four-step random access. Through this method, it is possible to avoid the problem of resource and computing power wasted caused by obtaining the first TA when the second node should be accessed in a four-step random access mode.

With reference to the sixth aspect, in a possible implementation manner, the foregoing processing unit determines the random access type of the first node according to the first GT and the first TA, including: the processing unit determines whether the first TA is greater than the first GT; if If the first TA is greater than the first GT, the first node determines that the random access type of the first node is four-step random access; if the first TA is less than or equal to the first GT, the processing unit determines the random access of the first node The type is two-step random access. The first node determines that the first TA is greater than the first GT, which indicates that the first GT cannot guarantee to avoid mutual interference between uplink signals in the two-step random access. In order to avoid the problem of mutual interference of uplink signals from different first nodes on the base station side, in this case, the first node will choose four-step random access. The first node determines that the first TA is less than or equal to the first GT, which means that the guard interval provided by the first GT can overcome the problem of uplink signal mutual interference on the second node side caused by the first node not sending uplink signals in advance. In this case, the first node will choose two-step random access. In order to solve the problem that the conventional random access technology is likely to cause the second node to be overloaded, cause network congestion, and respond to the problem that affects the user experience.

With reference to the sixth aspect, in a possible implementation manner, the above-mentioned first TA is calculated by the processing unit according to first position information used to characterize the distance between the first node and the second node. The first node acquires first location information used to characterize the distance between the first node and the second node, so as to initiate a random access request according to the first location information. Furthermore, when the two-step random access is initiated in the conventional technology, the TA value is not negotiated and determined, which causes the mutual interference of multiple uplink signals from multiple first nodes on the side of the second node.

With reference to the sixth aspect, in a possible implementation manner, the above-mentioned first position information is based on the measurement result of the positioning reference signal PRS by the first node, the measured arrival time TOA of the received signal, the demodulation reference signal DMRS, and the sounding reference signal At least one of SRS, synchronization signal and physical broadcast channel block SSB or channel state information CSI is determined. The present application does not limit the positioning method used to obtain the first position information, for example, it may be obtained according to at least one of PRS, TOA, DMRS, SRS, SSB, or CSI.

With reference to the sixth aspect, in a possible implementation manner, the measurement result of the PRS by the first node is obtained by measuring multiple PRSs by the first node; wherein the measurement result of the PRS by the first node includes one of the following information or Multiple: Reference signal received power RSRP, reference signal received quality RSRQ, reference signal time difference RSTD, narrowband reference signal received power NRSRP or narrowband reference signal received quality NRSRQ. This application does not limit the specific content of the measurement result reported by the first node for positioning the first node, for example, it may be at least one of RSRP, RSRQ, RSTD, NRSRP, or NRSRQ.

With reference to the sixth aspect, in a possible implementation manner, the foregoing first node further includes: a storage unit; the foregoing processing unit acquiring the first timing advance TA includes: the processing unit acquiring the second timing advance TA and the second position The above processing unit is also used to calculate the first TA according to the first position information, including: the processing unit compares the first position information with the second position information; if the position indicated by the first position information and the second position information indicate The distance of the position of is smaller than the preset threshold, and the processing unit determines that the first TA is the second TA. Among them, the second location information is the last location information of the first node saved by the storage unit before the first node enters the idle state from the connected state; the second TA is the storage unit saves the first node before the first node enters the idle state from the connected state The last one used by the first node, and the timing advance corresponding to the second location information. After the first node determines that the location of the first node has not moved or the range of movement is small, the first node can use the TA value determined last time by the first node as a basis for judging the random access type, which saves computing power.

With reference to the sixth aspect, in a possible implementation manner, the above-mentioned first location information is obtained by the above-mentioned receiving unit from a positioning management device; wherein, the positioning management device includes either a positioning management network element LMF or a positioning management component LMC . The first location information in this application may be obtained based on positioning technology, and this application does not limit the structure of the location management device used to locate the first node. For example, the location management device may be an LMF or LMC. Either.

In a seventh aspect, a first node is provided. The first node includes: a memory, a radio frequency circuit, and a processor connected to each other; wherein the memory is used to store computer program code, and the computer program code includes instructions; the radio frequency circuit is used to perform Sending and receiving of wireless signals; the processor is configured to execute the foregoing instructions, so that the first node executes the random access method in any one of the possible implementation manners of the first aspect, the second aspect, or the third aspect.

In an eighth aspect, a second node is provided. The second node includes: a receiving unit, a sending unit, and a processing unit. The foregoing receiving unit, sending unit, and processing unit are used in conjunction with the fourth, fifth, or sixth aspect. The first node interaction in any possible implementation manner implements the random access method in any possible implementation manner of the first aspect, the second aspect, or the third aspect.

In a ninth aspect, a second node is provided. The second node includes: a memory, a radio frequency circuit, and a processor connected to each other; wherein the memory is used to store computer program code, and the computer program code includes instructions; the radio frequency circuit is used to perform Sending and receiving of wireless signals; the processor is used to execute the above-mentioned instructions, so that the second node interacts with the first node in any one of the possible implementation manners of the fourth, fifth, sixth, or seventh aspect to realize Such as the random access method in any possible implementation manner of the first aspect, the second aspect, or the third aspect.

In a tenth aspect, a communication system is provided, the communication system including: the first node in any one of the possible implementation manners of the fourth aspect, the fifth aspect, the sixth aspect, or the seventh aspect, and the eighth aspect or the seventh aspect; The second node in the nine aspects.

With reference to the tenth aspect, in a possible implementation manner, the communication system may further include a positioning management device configured to determine the first location information in any one of the possible implementation manners of the first aspect to the ninth aspect.

In an eleventh aspect, a computer-readable storage medium is provided, and a computer program is stored on the computer-readable storage medium. When the computer program is run, any one of the first aspect, the second aspect, or the third aspect is possible. The random access method in the implementation mode.

In a twelfth aspect, a chip system is provided. The chip system includes a processor and a memory, and instructions are stored in the memory; when the instructions are executed by the processor, the first aspect, the second aspect, or the The random access method in any possible implementation manner in the third aspect. The chip system can be composed of chips, or it can include chips and other discrete devices.

In a thirteenth aspect, a computer program product is provided, which when running on a computer, enables the random access method in any one of the possible implementation manners of the first aspect, the second aspect or the third aspect to be implemented.

Description of the drawings

Figure 1 is a schematic flow diagram of two conventional random access methods.

Fig. 2 is a schematic diagram of four network architecture examples for random access provided by an embodiment of the application.

FIG. 3 is a schematic diagram of a hardware result of a second node (such as an access network device) provided by an embodiment of the application.

FIG. 4 is a schematic diagram of the hardware structure of a first node (such as a mobile phone) provided by an embodiment of the application.

Fig. 5 is an example of two random access scenarios provided by an embodiment of the application.

FIG. 6 is a schematic diagram of a TA-based uplink transmission mechanism provided by an embodiment of the application.

FIG. 7 is a flowchart of a random access method provided by an embodiment of the application.

FIG. 8 is a flowchart of an example of a method for a mobile phone to determine a random access type according to an embodiment of the application.

FIG. 9 is a flowchart of another example of a method for determining a random access type by a mobile phone according to an embodiment of the application.

Fig. 10 is a flow chart of another example of a method for determining a random access type by a mobile phone according to an embodiment of the application.

FIG. 11 is a flowchart of another random access method provided by an embodiment of this application.

FIG. 12 is a flowchart of two examples of methods for obtaining the first TA provided by the embodiments of the application.

FIG. 13 is a schematic structural diagram of a first node provided by an embodiment of this application.

FIG. 14 is a schematic structural diagram of another first node provided by an embodiment of this application.

FIG. 15 is a schematic structural diagram of a second node provided by an embodiment of this application.

FIG. 16 is a schematic block diagram of a communication device provided by an embodiment of the application.

FIG. 17 is another schematic block diagram of a communication device provided by an embodiment of this application.

FIG. 18 is a schematic block diagram of a processing device provided by an embodiment of the application.

FIG. 19 is still another schematic block diagram of the communication device provided by an embodiment of this application.

Detailed ways

The embodiment of the present application provides a random access method, which is applied to a process in which a first node (such as a mobile phone) sends a random access request to a second node (such as an access network device). In the embodiment of the present application, the first node may advance the uplink signal transmission time obtained by the first node in combination with the guard time (GT) of the uplink signal obtained from the second node by monitoring the broadcast message. Quantify TA to determine the random access type of the first node.

Among them, in this application, random access types include but are not limited to the four-step random access (4-step RACH) shown in Figure 1 (a) or the two-step random access shown in Figure 1 (b) Access (2-step RACH).

The random access method provided in this application can be applied to various communication systems. For example: long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (WiMAX) communication system, fifth generation (5G) system or new radio (NR), etc., the 5G mobile communication system involved in this application Including non-standalone (NSA) 5G mobile communication system or standalone (SA) 5G mobile communication system. The technical solution provided in this application can also be applied to future communication systems, such as the sixth-generation mobile communication system. The communication system can also be a public land mobile network (PLMN) network, a device-to-device (D2D) communication system, a machine-to-machine (M2M) communication system, and a device-to-device (D2D) communication system. Internet of things (IoT) communication system or other communication systems.

Please refer to FIG. 2. FIG. 2 uses the first node as a user equipment (UE) and the second node as an access network device, showing four example schematic diagrams of network architectures suitable for random access. As shown in (a) in Figure 2, the UE is connected to the access network equipment NG-RAN through the LTE-Uu and/or NR-Uu interfaces, respectively. Among them, NG-RAN may include base stations. For example, the base station may be a next-generation base station (next-generation eNodeB, ng-eNB) and/or gNB shown in (a) in FIG. 2. NG-RAN may include one or more ng-eNBs; NG-RAN may also include one or more gNBs; NG-RAN may also include one or more ng-eNBs and gNBs; NG-RAN may also include one or more A transmission/reception point (trasmission/reception point, TRP). Among them, Ng-eNB is a base station in the LTE communication system. The gNB is a base station in the NR communication system. The Ng-eNB and gNB communicate through the Xn interface. The NG-RAN communicates with the access and mobility management function (AMF) through the NG-C interface. In the process of UE random access, AMF is used to implement functions such as access management.

In this application, when the TA obtained by the UE for sending the uplink signal by the UE is determined by the UE according to the positioning information, the AMF may also be equivalent to a router for communication between a base station and a location management function (location management function, LMF). Among them, LMF is used to implement functions such as positioning management, including managing the reporting process of UE positioning information, and obtaining UE positioning information. The AMF and LMF communicate through the NLs interface.

Optionally, an LMF can also have a signaling connection with an enhanced serving mobile location center (E-SMLC), which is the core network entity responsible for processing positioning requests in the E-UTRA positioning architecture For example, positioning a specific UE and sending auxiliary data to the UE, etc. Therefore, the signaling connection between the LMF and the E-SMLC can enable the LMF to obtain positioning data from the E-UTRA system.

Optionally, an LMF may also have a signaling connection with a secure user plane location platform (SLP). Among them, the SLP is a SUPL (secure user plane location) entity responsible for positioning in the user plane positioning. Therefore, the signaling connection between the LMF and the SLP can enable the LMF to extend the support of user plane positioning solutions. Among them, SUPL is the positioning protocol framework specified by the Open Mobile Alliance (OMA).

Or, as shown in (b) in FIG. 2, a location management component (location management component, LMC) may also be integrated in the gNB and/or ng-eNB.

Or, as shown in (c) of FIG. 2, the LMC can be integrated into the NG-RAN independently of the gNB and ng-eNB, as a node of the NG-RAN. Among them, as a node of NG-RAN, LMC can undertake part of the functions of LMF.

In some possible structures, the access network equipment may be composed of a centralized unit (CU) and a distributed unit (DU). Among them, the CU may also be referred to as a control unit (control unit). Through the structure of CU-DU, the protocol layer of the access network equipment can be separated, part of the protocol layer functions are placed under the centralized control of the CU, and some or all of the protocol layer functions are distributed in the DU, and the CU centrally controls the DU . For example, radio resource control (radio resource control, RRC), service data adaptation protocol (service data adaptation protocol, SDAP), and packet data convergence protocol (packet data convergence protocol, PDCP) layers can be deployed in the CU; the rest of the wireless links The radio link control (RLC) layer, the media access control (MAC) layer, and the physical layer (Physical) are deployed in the DU. The CU and DU are connected through the F1 interface. CU stands for gNB to connect to the core network through the NG interface.

Optionally, the CU may also adopt a structure in which a control plane (control plane) entity and a user plane (UP) network element are separated, and one control plane network element manages multiple user plane network elements.

In an example, one gNB may have one gNB-CU-CP, multiple gNB-CU-UPs, and multiple gNB-DUs. One gNB-CU-CP connects to multiple gNB-CU-UPs through the E1 interface, one gNB-CU-CP can connect to multiple gNB-DUs through the F1-C interface, and one gNB-DU can connect to multiple gNB-DUs through the F1-U interface gNB-CU-UP.

As shown in (d) in FIG. 2, the gNB may include gNB-DU and gNB-CU. Among them, the gNB-DU and gNB-CU are connected through the F1 interface, and the gNB-CU is connected with the ng-eNB through the Xn-C interface. LMC is also integrated in gNB.

It should be understood that in the network architectures shown in Figure 2 (a), Figure 2 (b), Figure 2 (c), and Figure 2 (d), the network architecture may include one or more gNB, one or more UEs. A single gNB can accept random access requests from a single UE or multiple UEs.

It should also be understood that the devices or functional nodes included in the network architecture shown in Figure 2 (a), Figure 2 (b), Figure 2 (c), and Figure 2 (d) are only exemplary The description does not limit this application. In fact, in the network architecture shown in Figure 2 (a), Figure 2 (b), Figure 2 (c) and Figure 2 (d) It may also include other network elements or equipment or functional nodes that have an interactive relationship with the equipment or functional nodes illustrated in the figure, which is not specifically limited here.

It should also be understood that, in this application, the location management device may be the LMF shown in Figure 2 (a), Figure 2 (b), Figure 2 (c) or Figure 2 (d), It may also be the LMC shown in Fig. 2(b), Fig. 2(c) or Fig. 2(d). The location management device may also be a location management unit (LMU), or other network devices with a location management function. Fig. 2(a), Fig. 2(b), Fig. 2(c), and Fig. 2(d) only take the location management device as an example of LMF or LMC. This application does not apply to the location management device. Make specific restrictions.

The second node in this application may be Ng-eNB, gNB or as shown in Figure 2 (a), Figure 2 (b), Figure 2 (c) and Figure 2 (d) TRP. It may also be a base station defined by the 3rd generation partnership project (3GPP). For example, the base station equipment in the LTE system, that is, evolved NodeB (evolved NodeB, eNB/eNodeB) and so on.

In addition, when the eNB accesses the NR core network or next generation core network (NGC) or 5G core network (5th generation core network, 5GC), the eNB may also be referred to as eLTE eNB. Specifically, the eLTE eNB is an evolved LTE base station equipment based on the eNB, which can be directly connected to the 5G CN, and the eLTE eNB also belongs to the base station equipment in the NR.

Or, the second node may also be a wireless terminal (wireless terminal, WT). For example, an access point (access point, AP) or an access controller (access controller, AC), or other network equipment that has the ability to communicate with the UE and the core network. For example, relay equipment, in-vehicle equipment, etc. This application does not limit the type of the second node.

Please refer to FIG. 3, which shows a schematic diagram of a hardware result of a second node. As shown in FIG. 3, the second node may include a processor 301, a communication line 302, a memory 303, and at least one communication interface (in FIG. 3, the communication interface 304 is included as an example for illustration).

The processor 301 may be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more programs for controlling the execution of the program of this application. integrated circuit.

The communication line 302 may include a path to transmit information between the aforementioned components.

The communication interface 304 uses any device such as a transceiver to communicate with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. .

The memory 303 may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), or other types that can store information and instructions The dynamic storage device can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disk storage, optical disc storage (Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program codes in the form of instructions or data structures and can be used by a computer Any other media accessed, but not limited to this. The memory can exist independently and is connected to the processor through the communication line 302. The memory can also be integrated with the processor.

Among them, the memory 303 is used to store computer execution instructions for executing the solution of the application. The memory 303 can store instructions for implementing two modular functions: sending instructions, receiving instructions and processing instructions, and the processor 301 controls the execution. . The processor 301 is configured to execute computer-executable instructions stored in the memory 303, so as to implement the random access method provided in the following embodiments of the present application. The memory 303 shown in FIG. 3 is only a schematic diagram, and the memory may also include other functional instructions, which is not limited by the present invention.

Optionally, the computer-executable instructions in this application may also be referred to as application program code, which is not specifically limited in this application.

In a specific implementation, as an embodiment, the processor 301 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 3.

It should be noted that FIG. 3 is only used as an example of a network device, and does not limit the specific structure of the second node. For example, the second node may also include other functional modules. In addition, the core network equipment (for example, the positioning management equipment or the access and mobility management equipment, etc.) in this application may all have the same or similar hardware structure as in FIG. 3.

The first node in this application may be a desktop device, a laptop device, a handheld device, a wearable device, a smart home device, a computing device, a vehicle-mounted device, etc., with wireless connection function. For example, netbooks, tablet computers, smart watches, ultra-mobile personal computers (UMPC), smart cameras, netbooks, personal digital assistants (PDAs), portable multimedia players (PMPs) ), AR (augmented reality)/VR (virtual reality) devices, wireless devices on aircraft, wireless devices on robots, wireless devices in industrial control, wireless devices in telemedicine, wireless devices in smart grids, smart cities Wireless devices in the (smart city), wireless devices in the smart home (smart home), etc. Or the first node may also be a wireless device in narrowband (narrowband, NB) technology.

The first node in this application may also refer to an access terminal, a user unit, a user station, a mobile station, a mobile station, a relay station, a remote station, a remote terminal, a mobile device, a user terminal, and a user equipment (user equipment, UE), terminal (terminal), wireless communication equipment, user agent or user device. The first node can also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), and a wireless local loop (WLL) station. Communication function handheld devices, computing devices, or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices, terminal devices in the future 5G network, or the public land mobile network (PLMN) that will evolve in the future Terminal equipment or terminal equipment in the future Internet of Vehicles.

In addition, in this application, the first node can also be a terminal device in the IoT system. IoT is an important part of the development of information technology in the future. Its main technical feature is to connect objects to the network through communication technology to realize human-machine interaction. Connect, an intelligent network of interconnected things. In the embodiment of the present application, the IOT technology can achieve massive connections, deep coverage, and power saving of the terminal through, for example, narrowband (NB) technology.

In addition, in this application, the first node may also include sensors such as smart printers, train detectors, gas stations, etc. The main functions include collecting data, receiving control information and downlink data from the second node, and sending electromagnetic waves to the second node. Transmit upstream data. This application does not limit the specific type and structure of the first node.

Please refer to FIG. 4, which uses a mobile phone as an example to show a schematic diagram of the hardware structure of a first node. As shown in Figure 4, the first node 400 may specifically include: a processor 401, a radio frequency (RF) circuit 402, a memory 403, a touch screen 404 (including a touch pad 404-1 and a display 404-2), a Bluetooth device 405, a Or multiple sensors 406, a WIFI device 407, a positioning device 408, an audio circuit 409, a peripheral interface 410, a power supply device 411, a fingerprint collection device 412 and other components. These components can communicate through one or more communication buses or signal lines (not shown in Figure 4). Those skilled in the art can understand that the hardware structure shown in FIG. 4 does not constitute a limitation on the first node 400, and the first node 400 may include more or less components than those shown in the figure, or combine certain components, or Different component arrangements.

The components of the first node 400 will be specifically introduced below in conjunction with FIG. 2:

The processor 401 is the control center of the first node 400. It uses various interfaces and lines to connect various parts of the first node 400, runs or executes the application client program (hereinafter referred to as App) stored in the memory 403, and calls The data stored in the memory 403 executes various functions of the first node 400 and processes data. In some embodiments, the processor 401 may be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more for control For the integrated circuit executed by the program program of this application, the processor 401 may include one or more CPUs; for example, the processor 401 may be a Kirin 460 chip.

The radio frequency circuit 402 can be used to receive and send wireless signals during the process of sending and receiving information or talking. In particular, the radio frequency circuit 402 may receive the downlink data of the base station and send it to the processor 401 for processing; in addition, it may send the uplink data to the base station. Generally, the radio frequency circuit includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency circuit 402 can also communicate with other devices through wireless communication. The wireless communication can use any communication standard or protocol, including but not limited to Global System for Mobile Communications, General Packet Radio Service, Code Division Multiple Access, Wideband Code Division Multiple Access, Long Term Evolution, Email, Short Message Service, etc.

The memory 403 is used to store application programs and data. The memory 403 can be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions. Random access memory (RAM) ) Or other types of dynamic storage devices that can store information and instructions. They can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory, CD -ROM) or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store instructions or data structures The form of the desired program code and any other medium that can be accessed by the computer, but not limited to this. The processor 401 executes various functions and data processing of the first node 400 by running application programs and data stored in the memory 403. The memory 403 mainly includes a storage program area and a storage data area. The storage program area can store an operating system and at least one application program required by at least one function (such as a sound playback function, an image playback function, etc.); Data created when a node 400 (such as audio data, phone book, etc.). The memory 403 may store instructions for implementing two modular functions: receiving instructions and connection instructions, and the processor 401 controls the execution. The processor 401 is configured to execute computer-executable instructions stored in the memory 403, so as to implement the random access method provided in the following embodiments of the present application. In addition, the memory 403 may include a high-speed random access memory, and may also include a non-volatile memory, such as a magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices. The memory 403 can store various operating systems, for example, an iOS operating system, an Android operating system, and so on.

The first node 400 may also include at least one sensor 406, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor. The ambient light sensor can adjust the brightness of the display of the touch screen 404 according to the brightness of the ambient light, and the proximity sensor can turn off the display when the first node 400 is moved to the ear. Power supply. As a kind of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in various directions (usually three-axis), and can detect the magnitude and direction of gravity when it is stationary. It can be used for applications that recognize the smart phone's posture (such as horizontal and vertical screen switching, Related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, percussion), etc.; as for the first node 400, you can also configure other sensors such as gyroscope, barometer, hygrometer, thermometer, infrared sensor, etc. I won't repeat them here.

The positioning device 408 is configured to provide a geographic location for the first node 400. It is understandable that the positioning device 408 may specifically be a receiver of a positioning system such as a Global Positioning System (GPS), Beidou satellite navigation system, or Russian GLONASS. After the positioning device 408 receives the geographic location sent by the above-mentioned positioning system, the information is sent to the processor 401 for processing, or sent to the memory 403 for storage. In some other embodiments, the positioning device 408 may also be an assisted global satellite positioning system (AGPS) receiver. The AGPS system acts as an auxiliary server to assist the positioning device 408 in completing ranging and positioning services. In this case The assisted positioning server may communicate with the positioning device 408 (ie, GPS receiver) of the first node 400 through a wireless communication network to provide positioning assistance. In some other embodiments, the positioning device 408 may also be a positioning technology based on a Wi-Fi access point. Since each Wi-Fi access point has a globally unique MAC address, the first node can scan and collect the broadcast signals of surrounding Wi-Fi access points when Wi-Fi is turned on, so it can be obtained The MAC address broadcasted by the Wi-Fi access point; the first node sends the data (such as MAC address) that can identify the Wi-Fi access point to the location server through the wireless communication network, and the location server retrieves each Wi-Fi The geographic location of the Fi access point is combined with the strength of the Wi-Fi broadcast signal to calculate the geographic location of the first node and send it to the positioning device 408 of the first node.

Although not shown in FIG. 4, the first node 400 may also include a camera (a front camera and/or a rear camera), a flash, a micro-projection device, a near field communication (NFC) device, etc., which will not be repeated here.

It should be understood that the hardware modules included in the first node shown in FIG. 4 are only described as examples, and do not constitute a limitation to the present application. In fact, the first node shown in FIG. 4 may also include other hardware modules as shown in the figure. The hardware modules have other hardware modules that have an interactive relationship, which is not specifically limited here.

For ease of understanding, the concepts and terms that may appear in this application are explained below.

1. Connected state: also called connected state. The connection state refers to the establishment of a radio resource control (radio resource control, RRC) connection, so it is also called RRC_CONNECTED. Taking a mobile phone as an example, when the mobile phone is in a connected state, the connection between the mobile phone and the access network (such as a base station) and the core network (such as AMF) are established. If there is data to be transmitted, it can be completed directly through the established connection. Among them, the RRC connection is used to process control plane messages between the mobile phone and the access network.

2. Idle state: also called idle state (RRC_IDLE). Taking a mobile phone as an example, the idle state means that the RRC connection between the mobile phone and the access network (such as the base station) is not established, and the connection between the mobile phone's access network (such as the base station) and the core network (such as AMF) is not established. When the mobile phone is in an idle state, if there is data to be transmitted, random access needs to be initiated first to restore the connection between the mobile phone and the access network (e.g. base station), as well as the mobile phone’s access network (e.g. base station) and core network ( For example, the connection between AMF) can be used for data transmission.

3. Time advance TA: It can be understood that there is a delay in signal transmission in space.

For example, if the mobile phone moves away from the base station during data transmission with the base station, the downlink signal sent from the base station will arrive at the mobile phone "later and later". At the same time, the uplink signal sent by the mobile phone will also "increasingly". Arrive at the base station sooner. If the delay is too long, the signal from the mobile phone received by the base station in this time slot will overlap with the time slot in which the base station receives an uplink signal from another mobile phone, causing inter-symbol interference.

For another example, the distances between different mobile phones and base stations are different, and the propagation of signals in space is delayed. For example, the mobile phone 510 shown in (a) of FIG. 5 is closer to the base station 530, and the mobile phone 520 is farther from the base station 530. In order to initiate a two-step random access to the base station 530, the mobile phone 510 and the mobile phone 520 may simultaneously send an uplink signal carrying the PRACH preamble and PUSCH to the base station 530 (at time t ₀ as shown in (a) in FIG. 5). As shown in (a) of FIG. 5, the uplink signal sent by the mobile phone 510 _{arrives at the base station 530 at time t A} , and the uplink signal sent by the mobile phone 520 arrives at the base station at time _{t B , where t A is} earlier than t _B. However, the time when different uplink signals arrive at the base station is not synchronized, which will cause multiple uplink signals to overlap each other and cause inter-symbol interference.

In order to solve this problem, TA is introduced, which is used for mobile phones to send uplink signals according to the timing advance indicated by the TA. From the perspective of the mobile phone, the TA is essentially a negative offset (negative offset) between the start time of receiving the downlink subframe and the time of transmitting the uplink subframe. The mobile phone sends uplink signals according to different TAs, which can make the time for the uplink signals from different mobile phones to reach the base station to be basically aligned. Specifically, a mobile phone that is far from the base station has a greater transmission delay, so it must send an uplink signal earlier than a mobile phone that is closer to the base station.

Exemplarily, FIG. 6 shows a schematic diagram of a TA-based uplink transmission mechanism. As shown in Figure 6, suppose that the base station 530 sends the downlink synchronization frame timing to the mobile phone 510 at time t1. Since the transmission of the downlink signal from the base station 530 to the mobile phone 510 is delayed, the mobile phone 510 will receive the downlink synchronization from the base station 530 at time t2. Frame timing. t2=t1+△t, △t is the transmission time delay. The mobile phone 510 sends a random access request to the base station 530 while receiving the timing of the downlink synchronization frame from the base station 530 (that is, at time t2). Since the transmission of the uplink signal from the mobile phone 510 to the base station 530 is also delayed, the base station 530 will receive the random access request from the mobile phone 510 at time t3. Among them, t3=t2+△t. In order to compensate for the delay of the timing of the downlink synchronization frame and the delay of the uplink random access request, the mobile phone 510 may send the random access request 2×Δt in advance, that is, send the random access request at time t4. Among them, t4=t2-2×△t.

4. Random access: Random access is a necessary process for establishing a wireless link between the first node (such as a mobile phone) and the network. Only after the random access is completed, the first node can exchange data with the second node (such as a base station) normally.

Random access includes contention-based random access and non-contention-based random access. Among them, contention-based random access means that in order to improve the utilization rate of the spectrum, multiple first nodes can use the same PRACH resource in the same subframe to send PRACH preamble to the second node to obtain the spectrum of the second node. Resource authorization. Non-contention-based random access is random access initiated by the first node using a designated PRACH preamble on a designated PRACH channel resource according to an instruction of the second node.

Among the random access methods provided in this application, contention-based random access is mainly involved. More specifically, it mainly involves the selection of the access type of two-step random access or four-step random access in contention-based random access.

Please refer to FIG. 5, which takes the first node as a mobile phone as an example, showing two examples of random access scenarios provided by the embodiments of the present application. The random access method of the embodiment of the present application can be applied to the process in which the mobile phone (including the mobile phone 510, the mobile phone 520, etc.) shown in Figure 5 (a) accesses the base station 530, and can also be applied to (b) in Figure 5 ) The mobile phone (including the mobile phone 540, the mobile phone 550, etc.) in the process of accessing the base station 570 through the router 560.

It should be noted that FIG. 5 is only used as an example of two random access scenarios, and the random access method provided in the embodiment of the present application can also be applied to any other scenarios with random access requirements. In addition, the random access method in the embodiment of the present application may be applicable to any event that triggers random access. For example, the initial random access initiated when the UE is powered on or in an idle state. Or, when the UE is in the connected state, the link is reestablished due to the link drop, the handover is initiated due to the position movement, and the uplink synchronization is resumed due to the out-of-synchronization. The embodiment of this application does not limit the specific scenario of the random access method.

It can be understood that the random access method provided in the embodiment of the present application is performed when the mobile phone 510 determines that the mobile phone 510 has a random access requirement (if there is a data transmission requirement).

The random access methods provided in the embodiments of the present application can all be implemented in a first node having a hardware structure as shown in FIG. 4 or an electronic device having a similar structure. The following takes the mobile phone 510 shown in (a) in FIG. 5 to access the base station 530 as an example, and the mobile phone 510 with the hardware structure shown in FIG. 4 is taken as an example to introduce the random access method of the embodiment of the present application.

As shown in FIG. 7, the random access method provided by the embodiment of the present application may include steps S701-S703:

S701. The mobile phone 510 obtains the first timing advance TA.

The first TA is used by the mobile phone 510 to send a random access request to the base station 530 according to the uplink signal sending time indicated by the first TA.

In some embodiments, the first TA may be determined by the mobile phone 510 according to the path loss between the mobile phone 510 and the base station 530 to be accessed by the mobile phone 510, combined with the signal transmission rate and the relative distance between the mobile phone 510 and the base station 530. The path loss between the mobile phone 510 and the base station 530 can be calculated by the mobile phone 510 using the maximum transmit power of the base station 530 and the RSRP of the reference signal received by the mobile phone 510.

In other embodiments, the first TA may also be determined by the mobile phone 510 according to the positioning result of the mobile phone 510 by the positioning management device obtained by the mobile phone 510 from a positioning management device (such as an LMF or LMC). The specific process of the mobile phone 510 determining the first TA according to the positioning result of the positioning management device on the mobile phone 510 obtained by the mobile phone 510 from the positioning management device will be described below. For details, please refer to the introduction and description of FIG. 12 below.

S702. The mobile phone 510 receives the broadcast message from the base station 530. The broadcast message carries the first guard time (guard time, GT).

Among them, the first GT is used by the mobile phone 510 to increase the guard time in the uplink signal according to the duration indicated by the first GT. The introduction of the first GT can prevent the uplink signals (such as PRACH preamble and/or PUSCH) sent by the mobile phone 510 from causing mutual interference with uplink signals from other first nodes.

Exemplarily, as described above, the uplink signal in the two-step random access (ie, the MsgA shown in (b) in FIG. 1) includes the PRACH preamble and the PUSCH. The mobile phone 510 can introduce GT into the uplink signal used to send the PRACH preamble and PUSCH. For example, the PRACH preamble may include a preamble sequence of _{T SEQ duration and a GT} of T GT duration. The PUSCH may include a PUSCH sequence with a duration of _{T SEQ 'and a GT} with a duration of T GT'. Among them, GT does not carry any information.

In this embodiment of the application, the first GT is used for the mobile phone 510 to determine the random access type of the mobile phone 510. Therefore, the GT in this application can be flexibly configured based on specific actual conditions. The GT may be determined by the base station 530 based on the load, or the GT may also be the base station 530 based on the actual location of each first node (such as a mobile phone) that resides on the base station, or the GT may also be determined by the base station 530 based on its The hardware configuration or channel state is determined, or may also be determined by the base station 530 based on other factors. The embodiment of the application does not limit this.

S703. The mobile phone 510 determines the random access type of the mobile phone 510 according to the first GT and the first TA.

In a possible implementation manner, as shown in FIG. 8, the foregoing step S703 may include the following steps S801 and S802-1, or the foregoing step S703 may include the following steps S801 and S802-2:

S801. The mobile phone 510 determines whether the first TA is greater than the first GT.

If the first TA is greater than the first GT, go to S802-2. If the first TA is less than or equal to the first GT, go to S802-1.

It can be understood that if the first TA is less than or equal to the first GT, the guard interval provided by the first GT can overcome the problem of uplink signal mutual interference on the base station side caused by the mobile phone 510 not sending uplink signals in advance. In this case, the mobile phone 510 can adjust the uplink timing according to the first TA, and send the PUSCH sequence according to the adjusted uplink timing, which can ensure that the uplink signal will not interact with the uplink signal from other first nodes on the base station 530 side. interference. Alternatively, because the guard interval provided by the first GT is sufficient and will not cause interference problems, the mobile phone 510 may not send the PUSCH sequence in advance according to the first TA, but add the first GT at the front end of the PUSCH sequence. In this way, it can also be ensured that the uplink signal will not interfere with the uplink signals from other first nodes on the side of the base station 530. In this case, the mobile phone 510 can directly use two-step random access.

In a possible situation, assuming that it is greater than the first GT, it means that the first GT cannot guarantee to avoid mutual interference between uplink signals in two-step random access. In order to avoid the problem of mutual interference between uplink signals from different first nodes on the base station side, therefore, in this case, the mobile phone 510 will select four-step random access.

S802-1. The mobile phone 510 determines that the random access type of the mobile phone 510 is two-step random access.

It can be understood that according to the above explanation, when the mobile phone 510 determines to use two-step random access, the mobile phone 510 can adjust the uplink timing according to the first TA, and send the PUSCH sequence according to the adjusted uplink timing.

Or, as a possible implementation manner, the mobile phone 510 may not send the PUSCH sequence in advance according to the first TA, but add the first GT at the front end of the PUSCH sequence, and send the uplink signal to the base station 530.

S802-2. The mobile phone 510 determines that the random access type of the mobile phone 510 is the four-step random access.

Alternatively, as shown in FIG. 9, before step S801, the above step S703 may further include step S803:

S803. The mobile phone 510 determines whether the received power of the reference signal received by the mobile phone 510 is greater than the RSRP threshold.

The RSRP threshold may be a preset threshold obtained by the mobile phone 510 from the base station 530.

In some embodiments, the RSRP threshold may be determined by the base station 530 based on its consideration of two-step random access and four-step random access to the mobile phone. The RSRP threshold may be determined by the base station 530 based on the load, or the RSRP threshold may also be determined by the base station 530 based on its hardware configuration. Or it may be determined by the base station 530 based on other factors. The embodiment of the application does not limit this.

If the mobile phone 510 determines that the received power of the reference signal received by the mobile phone 510 is greater than the RSRP threshold, the mobile phone 510 executes S801. If the mobile phone determines that the received power of the reference signal received by the mobile phone 510 is less than or equal to the RSRP threshold, then go to S802-2.

Alternatively, S803 may also include: the mobile phone 510 determines whether the received power of the reference signal received by the mobile phone 510 is less than the RSRP threshold. If the mobile phone 510 determines that the received power of the reference signal received by the mobile phone 510 is greater than or equal to the RSRP threshold, the mobile phone 510 executes S801. If the mobile phone determines that the received power of the reference signal received by the mobile phone 510 is less than or equal to the RSRP threshold, then go to S802-2.

Alternatively, if the mobile phone 510 determines that the first TA is less than or equal to the first GT, as shown in FIG. 10, after step S801, the above step S703 may further include step S804:

S804: The mobile phone 510 determines whether the received power of the reference signal received by the mobile phone 510 is greater than the RSRP threshold.

If the mobile phone 510 determines that the received power of the reference signal received by the mobile phone 510 is greater than the RSRP threshold, then go to S802-1. If the mobile phone determines that the received power of the reference signal received by the mobile phone 510 is less than or equal to the RSRP threshold, then go to S802-2.

Alternatively, S804 may also include: the mobile phone 510 determines whether the received power of the reference signal received by the mobile phone 510 is less than the RSRP threshold. If the mobile phone 510 determines that the received power of the reference signal received by the mobile phone 510 is greater than or equal to the RSRP threshold, then go to S802-1. If the mobile phone determines that the received power of the reference signal received by the mobile phone 510 is less than the RSRP threshold, then go to S802-2.

Alternatively, as shown in FIG. 11, before step S701, the random access method provided in the embodiment of the present application may further include:

S704. The mobile phone 510 determines that the received power of the reference signal received by the mobile phone 510 is greater than the RSRP threshold.

It can be understood that the trigger condition for the mobile phone 510 to acquire the first TA is that the received power of the reference signal received by the mobile phone 510 is greater than the RSRP threshold. Since the received power of the reference signal received by the mobile phone 510 is at a relatively high level, the mobile phone 510 will consider accessing the base station 530 in a two-step random access manner. In order to further determine the random access type of the mobile phone 510, the mobile phone 510 may obtain the first TA, and further determine the random access type of the mobile phone 510 based on the first TA and the first GT obtained by the mobile phone 510 from the base station 530. When the received power of the reference signal received by the mobile phone 510 is at a poor level, in order to avoid further inter-code interference caused by the overlap of multiple uplink signals, the mobile phone 530 can access the base station in a four-step random access mode. 530.

Alternatively, the foregoing step S704 may also include: the mobile phone 510 determines that the received power of the reference signal received by the mobile phone 510 is greater than or equal to the RSRP threshold. Correspondingly, if the mobile phone 510 determines that the received power of the reference signal received by the mobile phone 510 is less than the RSRP threshold before step S701, the mobile phone 510 determines that the random access type of the mobile phone 510 is four-step random access. Wherein, if the mobile phone 510 determines that the received power of the reference signal received by the mobile phone 510 is less than the RSRP threshold before step S701, the mobile phone 510 does not need to perform the subsequent steps S701, S702, and S703.

It should be noted that when the mobile phone 510 executes the above step S704, the step S703 in the embodiment of the present application may include the steps S801 and S802-1 shown in FIG. 8, or the step S703 may include the step S801 shown in FIG. And S802-2. Regarding the specific execution process of step S703, reference may be made to the introduction and description of FIG. 8 above, which will not be repeated here.

It can be understood that the random access method provided in the embodiment of the present application determines the random access type of the mobile phone according to the TA obtained by the mobile phone for sending the uplink signal and the GT obtained by the mobile phone from the base station. Can balance the network load. Solve the problem that the conventional random access technology easily causes the network equipment to be overloaded, causes network congestion, and responds to the problem that affects the user experience.

Further, the mobile phone can also comprehensively analyze the pre-configured RSRP threshold, the TA obtained by the mobile phone to send uplink signals, and the GT obtained by the mobile phone from the base station to determine the random access type of the mobile phone. Further improve the degree of matching between the determination of the random access type and the actual network conditions, and obtain a better balance between network equipment load and user experience.

Further, in this embodiment of the present application, after the mobile phone 510 performs step S703, if the mobile phone 510 determines that the random access type of the mobile phone 510 is two-step random access according to the first GT and the first TA, the random During the access process, the mobile phone 510 may send the PRACH preamble and PUSCH (ie, MsgA) at the uplink signal sending moment indicated by the first TA. In order to solve the problem that the time when different uplink signals arrive at the base station is not synchronized, it will cause multiple uplink signals to overlap each other and cause inter-symbol interference.

It can be understood that in the conventional four-step random access technology, the second node will send to the first node the TA corresponding to the first node estimated by the second node based on the received PRACH preamble via Msg2 (as shown in (a) in Figure 1) Shown) to obtain a timing advance command (TAC). The second node informs the first node of the timing advance by sending Msg2 carrying the TAC to the first node.

Therefore, after the mobile phone 510 executes step S703, if the mobile phone 510 determines that the random access type of the mobile phone 510 is four-step random access according to the first GT and the first TA, the mobile phone 510 can send to the base station 530 in advance according to the first TA Uplink signal. Alternatively, the mobile phone 510 may also send an uplink signal to the base station 530 in advance according to the received TAC from the base station 530.

In the embodiment of the present application, for the mobile phone 510, steps S701, S702, and S703 are executed, and after the mobile phone 510 performs step S703, the mobile phone 510 determines that the random access type of the mobile phone 510 is four-step random access. The first TA sends an uplink signal to the base station 530 in advance, or can access the base station 530 in a four-step random access manner, and sends the uplink signal to the base station 530 in advance according to the TAC received from the base station 530 by the mobile phone 510.

For the case where the mobile phone 510 performs step S704, and the mobile phone 510 determines that the random access type of the mobile phone 510 is four-step random access after the mobile phone 510 performs step S704, the mobile phone 510 can access the base station 530 in a four-step random access manner , And according to the TAC received from the base station 530 by the mobile phone 510, the uplink signal is sent to the base station 530 in advance.

Since the second node estimates the TA corresponding to the first node based on the PRACH preamble received from the first node, the TA corresponding to the first node is determined according to the specific uplink transmission situation. Therefore, usually, the second node estimates the first node in the four-step random access process The corresponding TA is more accurate than the first TA determined by the first node based on the positioning technology. Therefore, preferably, when the mobile phone 510 determines that the random access type of the mobile phone 510 is four-step random access, the mobile phone 510 can access the base station 530 in a four-step random access manner, and according to the information received from the base station 530 by the mobile phone 510 The TAC sends an uplink signal to the base station 530 in advance.

As a possible implementation manner, the mobile phone 510 may obtain the first TA according to the positioning result of the mobile phone 510 obtained by the mobile phone 510 from the positioning management device. The following uses method (1) and method (2) as examples to introduce two methods for the mobile phone 510 to determine the first TA according to the positioning result of the mobile phone 510:

Method (1): The mobile phone 510 can calculate the first TA according to the first location information acquired by the mobile phone 510 from the positioning management device. As shown in FIG. 12, the mobile phone 510 may perform steps S1201 and S1202 to obtain the first TA:

S1201. The mobile phone 510 obtains first location information from the location management device.

Among them, the first position information is used to characterize the relative position of the mobile phone 510. More specifically, the first location information is used to characterize the distance between the mobile phone 510 and the base station 530.

In some embodiments, the first position information may be determined by the positioning management device (such as LMF or LMC) according to the measurement result of the positioning reference signal (positioning reference signal, PRS) and the demodulation reference signal (DMRS) of the mobile phone 510. At least one of sounding reference signal (sounding reference signal, SRS), synchronization signal, and physical broadcast channel block (synchronization signal and physical broadcast channel block, SSB) or channel state information (channel state information, CSI) is determined.

The measurement result of the PRS by the mobile phone 510 is obtained by the mobile phone 510 measuring PRS from multiple access network devices (such as base stations). Exemplarily, according to NR Rel-16, the PRS sent by multiple access network devices may be composed of multiple resource sets, and each resource set includes multiple resources. Each resource in a resource set corresponds to a beam, and each resource has its own index (identify, ID) number. Resources in different resource sets are sent on the same beam, and the mobile phone 510 measures the PRS in a beam scanning manner on all beams.

In the embodiment of the present application, the measurement result of the PRS by the mobile phone 510 may include, but is not limited to: time of arrival (TOA), reference signal received power (reference signal received power, RSRP), reference signal received quality ( Reference signal received quality (RSRQ), reference signal time difference (RSTD), narrowband reference signal reception power (NRSRP) or narrowband reference signal reception quality (NRSRQ) One or more of.

Exemplarily, in the embodiment of the present application, the positioning management device may locate the mobile phone 510 based on the signal TOA measured by the mobile phone 510 on the PRS based on the OTDOA positioning technology. The main process of the OTDOA positioning technology is: multiple base stations send PRS to the mobile phone 510, and the mobile phone 510 obtains signal arrival time information by measuring the PRS sent by the multiple base stations. The mobile phone 510 can report the measured PRS signal TOA to the positioning management unit, and the positioning management unit calculates the relative position of the mobile phone 510 according to the geographic locations of multiple base stations. Among them, the relative position of the mobile phone 510 is used to characterize the distance between the mobile phone 510 and the base station 530.

In the embodiment of the present application, the positioning management unit may obtain the round trip time (RTT) corresponding to the mobile phone 510 according to the TOA. Among them, RTT (in some codes, also called rtt) represents the time delay experienced by the sender from sending data to receiving the confirmation message (such as ACK) corresponding to the data sent by the receiver. The positioning management device can calculate the relative position of the mobile phone 510 according to the RTT calculation.

In a possible implementation manner, the positioning management device may obtain TOA based on direct time detection. Among them, the direct time detection may include, but is not limited to, one-way time detection or round-trip time detection. It should be noted that for radio frequency signals, a 1ns clock synchronization error will produce a ranging error of about 0.3m. Therefore, to measure TOA using this method, it is necessary to ensure high-precision time synchronization between the receiving end and the transmitting end clock.

For another example, in this embodiment of the present application, the positioning management device may locate the mobile phone 510 based on the signal obtained by the SRS or DMRS sent by the mobile phone 510 based on the angle of departure (AOD) positioning technology. The main process of AOD-based positioning technology is: the mobile phone 510 sends SRS (or DMRS) to multiple base stations, and the base station uses a directional antenna (Directional Antenna) or antenna array (Antenna Array) to obtain the SRS (or DMRS) sent by the mobile phone 510. DMRS) transmission direction. Then, the base station 530 calculates the relative position of the mobile phone 510 based on the directions of the SRS (or DMRS) received by the multiple base stations, combined with the geographic locations of the multiple base stations.

Alternatively, in the embodiments of the present application, for electronic devices such as mobile phones with strong computing capabilities, the electronic devices may also use the measurement results of the mobile phone 510 on the PRS (such as the received signal TOA), or the measurement results of the SRS or DMRS, combined with the positioning The geographic locations of the multiple base stations indicated by the management unit calculate the relative position of the mobile phone 510, that is, obtain the first position information of the mobile phone 510.

It should be noted that only a few positioning technologies are briefly listed and introduced above. Regarding the positioning technology of the mobile phone 510, reference may be made to the specific introduction and description in the conventional technology, and the embodiments of this application will not repeat them.

In the embodiment of the present application, the positioning management device (such as LMF or LMC) may obtain the first position information of the mobile phone 510 in response to the positioning request initiated by the mobile phone 510.

Alternatively, the positioning management device may obtain the first position information of the mobile phone 510 based on a long term evolution positioning protocol (LPP) or a positioning protocol of other communication systems. Regarding the process for the positioning management device to obtain the first position information of the mobile phone 510 based on the LPP protocol or other positioning protocols, reference may be made to the introduction and description in the conventional technology, which will not be repeated here.

S1202, the mobile phone 510 calculates the first TA according to the first location information.

In a possible implementation manner, the mobile phone 510 may obtain the distance between the mobile phone 510 and the base station 530 according to the first location information, and combine the transmission rate of the uplink signal to calculate the first TA. Regarding the specific process of calculating the TA according to the distance between the mobile phone 510 and the base station 530, reference may be made to the introduction and description in the conventional technology, which will not be repeated here.

Method (2): The mobile phone 510 can determine the first TA according to the first position information obtained by the mobile phone 510 from the positioning management device, and the second position information saved by the mobile phone 510 and the second TA. As shown in FIG. 12, the mobile phone 510 may perform steps S1201, S1203, and S1204 to obtain the first TA:

S1201. The mobile phone 510 obtains first location information from the location management device.

S1203. The mobile phone 510 obtains the second location information and the second TA.

The second location information is the last location information of the mobile phone 510 saved by the mobile phone 510 before the mobile phone 510 enters the idle state from the connected state. The second TA is the last one used by the mobile phone 510 saved by the mobile phone 510 before the mobile phone 510 enters the idle state from the connected state, and the time advance corresponding to the second location information.

In a possible implementation manner, the second location information may be obtained by the positioning management device in response to a positioning request initiated by the mobile phone 510 when the mobile phone 510 is in a connected state.

In another possible implementation manner, the second location information may also be obtained by the location management device in response to a location request initiated by the core network device when the mobile phone 510 is in the connected state.

Among them, the core network device can be the AMF shown in Figure 2 (a), Figure 2 (b), Figure 2 (c) or Figure 2 (d), or it can be a positioning service entity ( location service entities, LCS entities), or other core network equipment, this embodiment of the application does not limit this.

Among them, LCS Entities can be applications and clients; it can also be other entities with location service requirements, such as emergency calls. The embodiments of this application do not specifically limit LCS Entities and specific location service services.

S1204. The mobile phone 510 determines whether the distance l between the location indicated by the first location information and the location indicated by the second location information is less than a preset threshold l ₀ .

If l<l ₀ , the mobile phone 510 executes S1205; if l≥l ₀ , the mobile phone 510 executes S1202.

Alternatively, step S1204 may also include: the mobile phone 510 determines whether the distance l between the location indicated by the first location information and the location indicated by the second location information is greater than a preset threshold l ₀ . If l≤l ₀ , the mobile phone 510 executes S1205; if l>l ₀ , the mobile phone 510 executes S1202.

S1205. The mobile phone 510 determines that the first TA is the second TA.

That is to say, when the position of the mobile phone 510 after entering the idle state from the connected state does not change much, the mobile phone 510 can still use the last time advance (that is, the second TA) used by the mobile phone 510 before entering the idle state from the connected state. Random access request.

In this application, the first node calculates the TA value (that is, the first TA) used to send the signal according to the position information of the first node determined based on the positioning technology obtained by the first node (that is, the first position information). It can avoid that when the first node subsequently accesses the second node in a two-step random access mode, there is no TA to follow, resulting in the uplink signal sent by the first node being between the second node and the uplink signals from other first nodes. Interference issues between.

It can be understood that, in order to implement the functions of any of the foregoing embodiments, the first node and the second node in the present application include hardware structures and/or software modules corresponding to each function. Those skilled in the art should easily realize that in combination with the units and algorithm steps of the examples described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

The embodiment of the present application may divide the first node and the second node into functional modules. For example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware or software functional modules. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.

For example, in the case of dividing various functional modules in an integrated manner, as shown in FIG. 13, a schematic structural diagram of a first node provided in an embodiment of this application. The first node may include a receiving unit 1310, a processing unit 1320, and a sending unit 1330.

Wherein, the receiving unit 1310 is configured to support the first node to perform any of the above steps S701, S702, or S1201, and/or other processes used in the technology described herein. The processing unit 1320 is configured to support the first node to perform any of the above steps S701, S703, S704, S801, S802-1, S802-2, S803, S804, S1202, S1203, S1204 or S1205, and/or for Other processes of the technique described in this article. The sending unit 1330 supports the first node to send a random access request (Msg1 as shown in (a) in FIG. 1 or MsgA as shown in (b) in FIG. 1) to the second node, and/or used in this article Describe the other processes of the technology.

Further, in a possible structure, as shown in FIG. 14, the first node in this application may further include a storage unit 1340. The storage unit 1340 is configured to store the second location information and the second TA obtained by the mobile phone 510 from the positioning management device through the receiving unit 1310, so as to support the processing unit 1320 to perform S1203. The storage unit 1340 may also store information related to other processes of the technology described herein.

As shown in FIG. 15, a schematic structural diagram of a second node provided by an embodiment of this application. The second node may include a sending unit 1510, a receiving unit 1520, and a processing unit 1530.

Wherein, the sending unit 1510 is configured to send the first TA or the first GT to the first node. The receiving unit 1520 is configured to receive a random access request (Msg1 as shown in (a) in FIG. 1 or MsgA as shown in (b) in FIG. 1) from the first node, and/or for use as described herein Other processes of technology. The processing unit 1530 is configured to process a random access request from the first node. The sending unit 1510 is further configured to send feedback from the second node to the random access request from the first node to the first node (Msg2 or Msg4 as shown in (a) in Figure 1 or Msg4 in Figure 1 (a), or (b) in Figure 1). MsgB shown), and/or other processes used in the techniques described herein.

In some cases, a positioning management unit (such as the LMC shown in Figure 2 (b), Figure 2 (c) or Figure 2 (d)) may also be integrated in the second node. Wherein, the location management unit is used to determine the first location information of the first node. Further optionally, the location management unit may also be used to determine the second location information of the first node.

It should be noted that all relevant content of the steps involved in the foregoing method embodiments can be cited in the functional description of the corresponding functional module, and will not be repeated here.

It should be noted that the foregoing receiving unit 1310, receiving unit 1520, sending unit 1330, and sending unit 1510 may include radio frequency circuits. Specifically, the first node may receive and send wireless signals through the radio frequency circuit in the receiving unit 1310 and the sending unit 1330. The second node may receive and send wireless signals through the radio frequency circuit in the receiving unit 1520 and the sending unit 1510. Generally, the radio frequency circuit includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency circuit can also communicate with other devices through wireless communication. The wireless communication can use any communication standard or protocol, including but not limited to global system for mobile communications, general packet radio service, code division multiple access, broadband code division multiple access, long-term evolution, email, short message service, etc.

The embodiment of the present application also provides a communication device, and the communication device may be a first node or a second node, or a circuit. The communication device may be used to perform the actions performed by the first node in the foregoing method embodiments.

When the communication device is the first node, FIG. 16 shows a simplified schematic diagram of the structure of the first node. It is easy to understand and easy to illustrate. In Figure 16, the first node uses a mobile phone as an example. As shown in Figure 16, the first node includes a processor, a memory, a radio frequency circuit, an antenna, and an input and output device. The processor is mainly used to process the communication protocol and communication data, and to control the first node, execute the software program, and process the data of the software program. The memory is mainly used to store software programs and data. The radio frequency circuit is mainly used for the conversion of baseband signals and radio frequency signals and the processing of radio frequency signals. The antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users. It should be noted that some types of first nodes may not have input and output devices.

When data needs to be sent, the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna. When data is sent to the first node, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data . For ease of description, only one memory and processor are shown in FIG. 16. In the actual first node product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or storage device. The memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiment of the present application.

In the embodiments of the present application, the antenna and radio frequency circuit with the transceiver function may be regarded as the transceiver unit of the first node, and the processor with the processing function may be regarded as the processing unit of the first node. As shown in FIG. 16, the first node includes a transceiver unit 1610 and a processing unit 1620. The transceiving unit may also be referred to as a transceiver, a transceiver, a transceiving device, and so on. The processing unit may also be called a processor, a processing board, a processing module, a processing device, and so on. Optionally, the device for implementing the receiving function in the transceiver unit 1610 can be regarded as the receiving unit, and the device for implementing the sending function in the transceiver unit 1610 as the sending unit, that is, the transceiver unit 1610 includes a receiving unit and a sending unit. The transceiver unit may sometimes be referred to as a transceiver, a transceiver, or a transceiver circuit. The receiving unit may sometimes be called a receiver, a receiver, or a receiving circuit. The transmitting unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit.

It should be understood that the transceiving unit 1610 is configured to perform the sending and receiving operations on the standby side of the first node in the foregoing method embodiment, and the processing unit 1620 is configured to perform other operations on the first node in the foregoing method embodiment except for the transceiving operation.

For example, in an implementation manner, the transceiver unit 1610 is configured to perform the sending operation on the first node side in steps S701 and S702 in FIG. 7, and/or the transceiver unit 1610 is also configured to perform the first node in the embodiment of the present application. Other receiving and sending steps on the side. The processing unit 1620 is configured to execute step S703 in FIG. 7, and/or the processing unit 1620 is further configured to execute other processing steps on the first node side in the embodiment of the present application.

For another example, in another implementation manner, the transceiver unit 1610 is configured to perform the sending operation on the first node side in step S1201 in FIG. 12, and/or the transceiver unit 1610 is also configured to perform the first node side in the embodiment of the present application. The other sending and receiving steps. The processing unit 1620 is configured to execute S1202, S1203, S1204, or S1205 in FIG. 12, and/or the processing unit 1620 is also configured to execute other processing steps on the first node side in the embodiment of the present application.

For another example, in another implementation manner, the processing unit 1620 is configured to execute S801, S802-1, S802-2, S803, or S804 in FIG. 8, and/or the processing unit 1620 is also configured to execute Other processing steps on the first node side.

When the communication device is a chip-type device or circuit, the device may include a transceiver unit and a processing unit. Wherein, the transceiving unit may be an input/output circuit and/or a communication interface; the processing unit is an integrated processor or microprocessor or integrated circuit.

When the communication device in this embodiment is the first node, the device shown in FIG. 17 can be referred to. As an example, the communication device can perform functions similar to the processor 401 in FIG. 4. In FIG. 17, the device includes a processor 1710, a data sending processor 1720, and a data receiving processor 1730. The processing unit 1320 in the foregoing embodiment may be the processor 1710 in FIG. 17 and completes corresponding functions. The sending unit 1330 or the receiving unit 1310 in the foregoing embodiment may be the sending data processor 1720 and/or the receiving data processor 1730 in FIG. 17. Although the channel encoder and the channel decoder are shown in FIG. 17, it can be understood that these modules do not constitute a restrictive description of this embodiment, and are only illustrative.

Fig. 18 shows another form of this embodiment. The processing device 1800 includes modules such as a modulation subsystem, a central processing subsystem, and a peripheral subsystem. The communication device in this embodiment can be used as the modulation subsystem therein. Specifically, the modulation subsystem may include a processor 1803 and an interface 1804. The processor 1803 completes the functions of the aforementioned processing unit 1320, and the interface 1804 completes the aforementioned functions of the sending unit 1330 or the receiving unit 1310. As another variation, the modulation subsystem includes a memory 1806, a processor 1803, and a program stored in the memory 1806 and running on the processor. The processor 1803 implements the first node in the foregoing method embodiment when the program is executed. Side approach. It should be noted that the memory 1806 can be non-volatile or volatile, and its location can be located inside the modulation subsystem or in the processing device 1800, as long as the memory 1806 can be connected to the The processor 1803 is fine.

As another form of this embodiment, a computer-readable storage medium is provided, and an instruction is stored thereon. When the instruction is executed, the method on the standby side of the first node in the foregoing method embodiment is executed.

As another form of this embodiment, a computer program product containing instructions is provided, when the instructions are executed, the method on the first node side in the foregoing method embodiment is executed.

As another form of this embodiment, a communication system is provided. The communication system includes a first node, a second node, a positioning management device, and other network elements related to a random access process. The communication system is used to implement the random access method in any possible implementation manner provided in this application.

As another form of this embodiment, a chip system is provided. The chip system includes a processor and a memory, and instructions are stored in the memory; when the instructions are executed by the processor, any possible implementation provided in this application is implemented. Random access method in the mode. The chip system can be composed of chips, or it can include chips and other discrete devices.

When the communication device in this embodiment is a second node, the second node may be as shown in FIG. 19, and the second node 1900 includes one or more radio frequency units, such as a remote radio unit (RRU) 1910 and One or more baseband units (BBU) (also referred to as digital unit, DU) 1920. The RRU 1910 may be called a transceiver module, and is the same as the sending unit 1510 or the receiving unit 1520 in FIG. 15. Correspondingly, optionally, the transceiver module may also be called a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 1911 and a radio frequency unit 1912. The RRU 1910 part is mainly used for sending and receiving of radio frequency signals and conversion of radio frequency signals and baseband signals, for example, for sending instruction information to the first node. The 1920 part of the BBU is mainly used for baseband processing, control of the base station, and so on. The RRU 1910 and the BBU 1920 may be physically set together, or may be physically separated, that is, a distributed base station.

The BBU 1920 is the control center of the base station, and may also be called a processing module, which may correspond to the processing unit 1530 in FIG. 15, and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading. For example, the BBU (processing module) may be used to control the base station to execute the operation procedure of the first node in the foregoing method embodiment, for example, to generate the foregoing indication information.

In an example, the BBU 1920 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network (such as an LTE network) with a single access standard, or can support different access standards. Wireless access network (such as LTE network, 5G network or other networks). The BBU 1920 also includes a memory 1921 and a processor 1922. The memory 1921 is used to store necessary instructions and data. The processor 1922 is configured to control the base station to perform necessary actions, for example, to control the base station to execute the operation procedure of the second node in the foregoing method embodiment. The memory 1921 and the processor 1922 may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.

In an optional manner, when software is used to implement data transmission, it may be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, all or part of the processes or functions described in the embodiments of the present application are realized. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media. The usable medium may be a magnetic medium, (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

The steps of the method or algorithm described in the embodiments of the present application may be implemented in a hardware manner, or may be implemented in a manner in which a processor executes software instructions. Software instructions can be composed of corresponding software modules, which can be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, mobile hard disk, CD-ROM or any other form of storage known in the art Medium. An exemplary storage medium is coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and the storage medium may be located in the ASIC. In addition, the ASIC may be located in the detection device. Of course, the processor and the storage medium may also exist as discrete components in the detection device.

Through the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of the above-mentioned functional modules is used as an example for illustration. In practical applications, the above-mentioned functions can be allocated according to needs. It is completed by different functional modules, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

In the several embodiments provided in this application, it should be understood that the disclosed user equipment and method may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods, for example, multiple units or components may be It can be combined or integrated into another device, or some features can be omitted or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate parts may or may not be physically separate. The parts displayed as units may be one physical unit or multiple physical units, that is, they may be located in one place, or they may be distributed to multiple different places. . Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application are essentially or the part that contributes to the prior art, or all or part of the technical solutions can be embodied in the form of a software product, and the software product is stored in a storage medium. It includes several instructions to make a device (which may be a single-chip microcomputer, a chip, etc.) or a processor (processor) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any changes or substitutions within the technical scope disclosed in this application shall be covered by the protection scope of this application. . Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims (30)

A random access method, characterized in that the method includes: The first node obtains the first timing advance TA; The first node receives a broadcast message from a second node; the broadcast message carries a first guard time GT; the first GT is used to determine the random access type of the first node; Determining, by the first node, the random access type of the first node according to the first GT and the first TA; Wherein, the random access type is two-step random access or four-step random access. The method according to claim 1, wherein the first node determining the random access type of the first node according to the first GT and the first TA comprises: The first node judges whether the first TA is greater than the first GT; If the first TA is greater than the first GT, the first node determines that the random access type of the first node is the four-step random access. The method according to claim 2, wherein the method further comprises: if the first TA is less than or equal to the first GT, the first node determines the random access type of the first node Is the two-step random access. The method according to claim 2, wherein if the first TA is less than or equal to the first GT, the method further comprises: Determining, by the first node, whether the received power of the reference signal received by the first node is greater than a reference signal received power RSRP threshold; If the received power of the reference signal received by the first node is greater than the RSRP threshold, the first node determines that the random access type of the first node is two-step random access; If the received power of the reference signal received by the first node is less than or equal to the RSRP threshold, the first node determines that the random access type of the first node is four-step random access. The method according to claim 2 or 3, wherein before the first node determines whether the first TA is greater than the first GT, the method further comprises: The first node determines whether the received power of the reference signal received by the first node is greater than the RSRP threshold of the reference signal received power; and, The first node determines that the received power of the reference signal received by the first node is greater than the RSRP threshold. The method according to any one of claims 1-5, wherein the first TA is calculated by the first node according to first location information; Wherein, the first location information is used to characterize the distance between the first node and the second node. The method according to claim 6, wherein the first position information is based on the measurement result of the positioning reference signal PRS by the first node, the measured arrival time TOA of the received signal, the demodulation reference signal DMRS, and the detection At least one of the reference signal SRS, the synchronization signal and the physical broadcast channel block SSB or the channel state information CSI is determined. The method according to claim 6 or 7, wherein the obtaining the first timing advance TA by the first node comprises: The first node obtains a second timing advance TA and second location information; the second location information is the first node saved by the first node before the first node enters the idle state from the connected state The last position information of the node; the second TA is the last one used by the first node saved by the first node before the first node enters the idle state from the connected state, and is the same as the second position The amount of time advance corresponding to the information; Comparing the first location information with the second location information by the first node; If the distance between the location indicated by the first location information and the location indicated by the second location information is less than a preset threshold, the first node determines that the first TA is the second TA. The method according to any one of claims 6-8, wherein the first location information is obtained by the first node from a positioning management device; Wherein, the positioning management device includes any one of a positioning management network element LMF or a positioning management component LMC. A random access method, characterized in that the method includes: First location information obtained by the first node; wherein the first location information is used to characterize the distance between the first node and the second node; The first node calculates the first timing advance TA according to the first location information; The first node sends a random access request to the second node according to the first TA. The method according to claim 10, wherein the first location information obtained by the first node comprises: The first node obtains the first position information obtained by the positioning management device based on the positioning of the first node from the positioning management device. The method according to claim 10 or 11, wherein before the first node calculates the first TA according to the first position information, the method further comprises: The first node obtains a second timing advance TA and second location information; the second location information is the first node saved by the first node before the first node enters the idle state from the connected state The last position information of the node; the second TA is the last one used by the first node saved by the first node before the first node enters the idle state from the connected state, and is the same as the second position The amount of time advance corresponding to the information; The first node calculating the first TA according to the first location information includes: Comparing the first location information with the second location information by the first node; If the distance between the location indicated by the first location information and the location indicated by the second location information is less than a preset threshold, the first node determines that the first TA is the second TA. The method according to any one of claims 10-12, wherein the method further comprises: The first node receives a broadcast message from the second node; the broadcast message carries a first guard time GT; the first GT is used to determine the random access type of the first node; Determining, by the first node, the random access type of the first node according to the first GT and the first TA; Wherein, the random access type is two-step random access or four-step random access. The method according to claim 13, wherein the first node determining the random access type of the first node according to the first GT and the first TA comprises: The first node judges whether the first TA is greater than the first GT; If the first TA is greater than the first GT, the first node determines that the random access type of the first node is the four-step random access. The method according to claim 14, wherein the method further comprises: If the first TA is less than or equal to the first GT, the first node determines that the random access type of the first node is the two-step random access. The method according to claim 14, wherein if the first TA is less than or equal to the first GT, the method further comprises: Determining, by the first node, whether the received power of the reference signal received by the first node is greater than a reference signal received power RSRP threshold; If the received power of the reference signal received by the first node is greater than the RSRP threshold, the first node determines that the random access type of the first node is two-step random access; If the received power of the reference signal received by the first node is less than or equal to the RSRP threshold, the first node determines that the random access type of the first node is four-step random access. The method according to claim 14 or 15, characterized in that, before the first node determines whether the first TA is greater than the first GT, the method further comprises: The first node determines whether the received power of the reference signal received by the first node is greater than the RSRP threshold of the reference signal received power; and, The first node determines that the received power of the reference signal received by the first node is greater than the RSRP threshold. A random access method, characterized in that the method includes: The first node judges whether the received power of the reference signal received by the first node is greater than the reference signal received power RSRP threshold; If the received power of the reference signal received by the first node is greater than the RSRP threshold, the first node obtains a first timing advance TA; The first node receives a broadcast message from a second node; the broadcast message carries a first guard time GT; the first GT is used to determine the random access type of the first node; Determining, by the first node, the random access type of the first node according to the first GT and the first TA; Wherein, the random access type is two-step random access or four-step random access. The method according to claim 18, wherein the method further comprises: If the received power of the reference signal received by the first node is less than or equal to the RSRP threshold, the first node determines that the random access type of the first node is the four-step random access. The method according to claim 18, wherein the first node determining the random access type of the first node according to the first GT and the first TA comprises: The first node judges whether the first TA is greater than the first GT; If the first TA is greater than the first GT, the first node determines that the random access type of the first node is the four-step random access; If the first TA is less than or equal to the first GT, the first node determines that the random access type of the first node is the two-step random access. The method according to any one of claims 18-20, wherein the first TA is calculated by the first node according to first location information; Wherein, the first location information is used to characterize the distance between the first node and the second node. The method according to claim 21, wherein the first node acquiring the first timing advance TA comprises: The first node obtains a second timing advance TA and second location information; the second location information is the first node saved by the first node before the first node enters the idle state from the connected state The last position information of the node; the second TA is the last one used by the first node saved by the first node before the first node enters the idle state from the connected state, and is the same as the second position The amount of time advance corresponding to the information; Comparing the first location information with the second location information by the first node; If the distance between the location indicated by the first location information and the location indicated by the second location information is less than a preset threshold, the first node determines that the first TA is the second TA. The method according to any one of claims 20-22, wherein the first location information is obtained by the first node from a positioning management device; Wherein, the positioning management device includes any one of a positioning management network element LMF or a positioning management component LMC. A first node, characterized in that, the first node comprises: a receiving unit and a processing unit; the receiving unit and the processing unit are used to support the first node to implement the following claims 1-7, 9. The random access method described in any one of 10, 11, 13-17, 18-21, or 23. The first node according to claim 24, wherein the first node further comprises: a storage unit, configured to support the first node with the receiving unit and the processing unit to implement as claimed in claim 8, 12 or The random access method described in any one of 22. A first node, characterized in that, the first node includes: a memory, a radio frequency circuit, and a processor connected to each other; The memory is used to store computer program code, where the computer program code includes instructions; The radio frequency circuit is used to send and receive wireless signals; The processor is configured to execute the instructions, so that the first node implements the random access according to any one of claims 1-7, 9, 10, 11, 13-17, 18-21 or 23入方法。 Entry method. The first node according to claim 26, wherein the memory is further configured to store the second timing advance TA and second position information according to any one of claims 8, 12 or 22; The processor is further configured to execute the instructions, so that the first node implements the random access method according to any one of claims 8, 12 or 22. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and the random access according to any one of claims 1-23 is realized when the computer program is run. method. A chip system, characterized in that the chip system includes a processing circuit and a storage medium, and instructions are stored in the storage medium; when the instructions are executed by the processing circuit, the implementation is as in any one of claims 1-23. The random access method described in item. A computer program product, wherein the computer program product includes program instructions, and when the program instructions are executed, the random access method according to any one of claims 1-23 is realized.

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