CN114765813A - Conditional primary and secondary cell adding or changing method, primary/secondary node and communication system - Google Patents
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Abstract
The disclosure provides a conditional primary and secondary cell adding or changing method, a primary/secondary node and a communication system, and relates to the field of wireless communication. In a multi-access dual-connection scene, aiming at user equipment which is to perform a conditional main and auxiliary cell adding/changing process, a main node sends an auxiliary node adding request to a corresponding candidate auxiliary node, carries a first cell and represents the estimated probability of the conditional main and auxiliary cell adding/changing process reaching the candidate auxiliary node; the master node receives a slave node adding request response returned by the candidate slave node to indicate whether the candidate slave node receives the slave node adding request or not; and under the condition that the candidate auxiliary node receives the auxiliary node adding request, the main node sends the configuration information of conditional main and auxiliary cell adding/changing to the user equipment, so that the user equipment selects a target auxiliary node from the candidate auxiliary node according to the configuration information and initiates random access to the main and auxiliary cells of the target auxiliary node. Therefore, the waste of the reserved resources of the candidate auxiliary nodes is reduced, and the resource utilization rate is improved.
Description
Technical Field
The present disclosure relates to the field of wireless communications, and in particular, to a conditional primary and secondary cell adding or changing method, a primary/secondary node, and a communication system.
Background
With 5G (5)thGeneration, fifth Generation) acceleration of network deployment Process, 4G (4)thGeneration, fourth Generation)/5G networks will coexist for a long period of time. The application of the MR-DC (Multi-Radio Access Technology Dual Connectivity) Technology will effectively improve the network coverage and system capacity, and simultaneously ensure the service quality of the user and improve the utilization rate of the network spectrum.
According to the method, a User Equipment (UE) is configured aiming at a Primary and Secondary Cell (PSCell) with a condition to add or Change a Conditional PSCell Addition/Change, the MN (Master Node ) carries out a Conditional PSCell Addition/Change process, the UE initiates a synchronization process with a peripheral candidate SN (Secondary Node ) according to the receiving quality of Cell reference signals of the SN, and when a certain candidate SN Cell meets a configuration threshold, a measurement report does not need to be reported to the MN, so that the success rate of the PSCell Addition/Change process is effectively improved.
The inventor finds that it is difficult for the candidate secondary node to determine which of the conditional primary and secondary cell addition/change flows is actually accessed from the candidate secondary node, so that after the candidate secondary node receives the secondary node addition request of the user equipment, the conditional primary and secondary cell addition/change flow may not actually reach the candidate secondary node, and resources reserved by the candidate secondary node are wasted.
Disclosure of Invention
In order to solve the above problems, a conditional primary and secondary cell adding or changing method, a primary/secondary node, and a communication system are proposed.
Some embodiments of the present disclosure provide a method for adding or changing a conditional primary cell and a conditional secondary cell, including:
under a multi-access dual-connection scene, aiming at user equipment which is to perform a conditional main and auxiliary cell adding/changing process, a main node sends an auxiliary node adding request to a corresponding candidate auxiliary node, wherein the auxiliary node adding request carries a first cell which represents the estimated probability that the conditional main and auxiliary cell adding/changing process reaches the candidate auxiliary node;
the master node receives a slave node adding request response returned by the candidate slave node aiming at the slave node adding request so as to indicate whether the candidate slave node accepts the slave node adding request or not;
and under the condition that the candidate auxiliary node accepts the auxiliary node adding request, the main node sends configuration information of conditional main and auxiliary cell adding/changing to the user equipment, so that the user equipment selects a target auxiliary node from the candidate auxiliary node according to the configuration information and initiates random access to the main and auxiliary cells of the target auxiliary node.
In some embodiments, the secondary node add request response carries a second information element indicating a maximum number of conditional primary and secondary cell add/change procedures that the candidate secondary node can support for the user equipment; the method further comprises the following steps: the master node judges whether the number of conditional primary and secondary cell addition/change flows for the user equipment and the candidate secondary nodes reaches a maximum number; if the maximum number is not reached, sending an auxiliary node adding request to the candidate auxiliary node again aiming at the user equipment next time; and if the maximum number is reached, no secondary node adding request is sent to the candidate secondary node for the user equipment next time.
In some embodiments, the master node or the secondary node requesting to initiate the conditional primary and secondary cell change estimates a probability that the conditional primary and secondary cell addition/change procedure reaches the candidate secondary node according to at least one of success/failure information of a historical conditional primary and secondary cell addition/change procedure, location information of the user equipment, trajectory information, direction information, and reference signal reception quality of the candidate secondary node, and the secondary node requesting to initiate the conditional primary and secondary cell change sends the first cell to the master node through primary and secondary cell change requirement signaling.
In some embodiments, the method further comprises: the main node sends an auxiliary node release request to a source auxiliary node of the user equipment; and the main node receives a secondary node release request response returned by the source secondary node.
In some embodiments, for a conditional primary and secondary cell addition procedure, the first information element indicates a probability that the current conditional primary and secondary cell addition procedure estimated by the master node reaches the candidate secondary node; aiming at a conditional primary and secondary cell change process initiated by a main node, the first information element represents the probability that the current conditional primary and secondary cell change process estimated by the main node reaches the candidate secondary node; aiming at the condition main and auxiliary cell change process initiated by the auxiliary node, the first information element represents the probability that the current condition main and auxiliary cell change process estimated by the auxiliary node requesting to initiate the condition main and auxiliary cell change reaches the candidate auxiliary node, and the auxiliary node requesting to initiate the condition main and auxiliary cell change sends the first information element to the main node through the main and auxiliary cell change demand signaling.
Some embodiments of the present disclosure provide a method for adding or changing a conditional primary cell and a conditional secondary cell, including:
receiving an auxiliary node adding request sent by a main node aiming at user equipment which wants to perform a conditional main and auxiliary cell adding/changing process by a candidate auxiliary node, wherein the auxiliary node adding request carries a first information element which represents the estimated probability of the current conditional main and auxiliary cell adding/changing process reaching the candidate auxiliary node;
the candidate auxiliary node returns an auxiliary node adding request response to the main node aiming at the auxiliary node adding request so as to indicate whether the candidate auxiliary node accepts the auxiliary node adding request;
the candidate auxiliary node reserves corresponding resources under the condition of accepting the auxiliary node adding request;
and responding to random access initiated by the user equipment to a primary cell and a secondary cell of the target secondary node by the target secondary node selected by the user equipment in the candidate secondary nodes, wherein the target secondary node is selected from the candidate secondary nodes by the user equipment according to configuration information added/changed by the conditional primary cell and the secondary cell sent by the master node.
In some embodiments, the method further comprises: and the candidate auxiliary node determines whether to accept the auxiliary node adding request or not according to the first information element and by combining the load of the candidate auxiliary node.
In some embodiments, when the current load of the candidate secondary node is greater than a preset load, if the probability that the current conditional primary and secondary cell addition/change procedure reaches the candidate secondary node is greater than or equal to a preset probability and the probability that the conditional primary and secondary cell addition/change procedure related to the current load reaches the candidate secondary node is smaller than a preset value, the candidate secondary node accepts the secondary node addition request.
In some embodiments, in the event that the current load of the candidate secondary node is so large as to exceed a preset load: if the probability that the current conditional main and auxiliary cell adding/changing flow reaches the candidate auxiliary node is larger than or equal to the preset probability, the candidate auxiliary node receives the auxiliary node adding request; and if the probability that the current condition main and auxiliary cell adding/changing process reaches the candidate auxiliary node is less than the preset probability, the candidate auxiliary node refuses the auxiliary node adding request.
In some embodiments, the candidate secondary node carries a second information element in the secondary node addition request response, where the second information element represents a maximum number of conditional primary and secondary cell addition/change procedures that the candidate secondary node can support for the ue, so that the primary node determines, according to the maximum number, whether to send a secondary node addition request to the candidate secondary node again for the ue next time.
In some embodiments, the candidate secondary node determines the size of the maximum number indicated by the second information element based on the current load and the size of the probability of arrival indicated by the first information element.
In some embodiments, the secondary node addition request is a SgNB addition request or a SN addition request, which carries a first information element and a third information element, the third information element indicating that the request is a conditional primary and secondary cell addition request, SgNB indicating a secondary node in EN-DC, and SN indicating a secondary node in NE-DC or NR-DC.
Some embodiments of the present disclosure provide a master node, including: a memory; and a processor coupled to the memory, the processor configured to perform a conditional primary and secondary cell addition or change method based on instructions stored in the memory.
Some embodiments of the present disclosure provide a secondary node, including: a memory; and a processor coupled to the memory, the processor configured to perform a conditional primary and secondary cell addition or change method based on instructions stored in the memory.
Some embodiments of the present disclosure provide a communication system, including: a master node; and a secondary node.
Some embodiments of the present disclosure provide a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of a conditional primary and secondary cell addition or change method.
According to some embodiments of the present disclosure, in a multi-access dual-connection scenario, for a user equipment that is to perform a conditional master-slave cell addition/change procedure, a master node adds an estimated probability that the conditional master-slave cell addition/change procedure reaches a candidate slave node to a slave node addition request sent by the candidate slave node, so that the candidate slave node determines whether to accept the slave node addition request and reserve resources accordingly, thereby reducing the waste of reserved resources of the candidate slave node and improving the resource utilization rate.
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The drawings that will be used in the description of the embodiments or the related art will be briefly described below. The present disclosure can be understood more clearly from the following detailed description, which proceeds with reference to the accompanying drawings.
It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without undue inventive faculty.
FIG. 1 is a schematic diagram of MR-DC of some embodiments of the present disclosure.
Fig. 2A is a flowchart illustrating a conditional primary and secondary cell addition method according to some embodiments of the disclosure.
Fig. 2B is a flow chart of a conditional primary and secondary cell change method according to some embodiments of the disclosure.
Fig. 3 is a schematic diagram of a communication system of some embodiments of the present disclosure.
Fig. 4 is a schematic diagram of a master node of some embodiments of the present disclosure.
Fig. 5 is a schematic diagram of a candidate secondary node of some embodiments of the present disclosure.
Detailed Description
The technical solutions in some embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in some embodiments of the present disclosure.
Unless otherwise specified, "first", "second", and the like in the present disclosure are described to distinguish different objects, and are not intended to mean size, timing, or the like.
FIG. 1 is a schematic diagram of MR-DC of some embodiments of the present disclosure.
In MR-DC, DC is an operation mode in which a UE and two base stations are connected, and MR refers to multiple RATs (Radio Access Technology). For example, in one MR-DC technique, a UE is connected with one eNB (4G base station) and one gNB (5G base station), respectively.
In the MR-DC, a base station Node whose control plane is directly connected to the core network is called MN (Master Node), and a base station Node whose control plane is not directly connected to the core network is called SN (Secondary Node). As in fig. 1, an eNB directly connected to an EPC (Evolved Packet Core) is an MN, and a gNB not directly connected to the EPC is an SN.
The MR-DC includes various specific modes such as EN-DC, NE-DC, NR-DC, etc., according to different situations of two base stations to which the UE is connected. An EN-DC, LTE-NR DC, LTE (Long Term Evolution ) base station is a primary node and a 5G NG (New Radio, New air interface) base station is a secondary node. NE-DC, NR-LTE DC, NR base station is the primary node and LTE base station is the secondary node. The NR-DC, i.e. NR-NR DC, primary and secondary nodes are all NR base stations.
Some embodiments of the present disclosure improve the utilization rate of the SN-side cache resource in the Conditional PSCell Addition/Change scenario by exchanging auxiliary information between the MN and the SN. The assistance information comprises, for example, at least one of the first information element or the second information element. As shown in fig. 1, in the process of adding or changing the conditional primary and secondary cells, the MN sends a first cell to the SN, and the SN sends a second cell to the MN.
The first cell is described below.
The first cell (e.g., Estimated Arrival Probability) is added to the secondary node Addition request sent by the MN to the candidate SN to indicate the Arrival Probability of the current Conditional PSCell Addition/Change procedure, which means the Probability that the candidate SN is finally successfully selected (arrived) by the MN or the current Conditional PSCell Addition/Change procedure Estimated by the source SN. The candidate SN may decide whether to accept the secondary node addition request, whether to reserve resources for the UE, and rationally plan its own resource allocation according to the first information element.
Aiming at the condition main and auxiliary cell adding process, a first cell represents the probability that the current condition main and auxiliary cell adding process estimated by a main node reaches a candidate auxiliary node; aiming at a conditional main and auxiliary cell change process initiated by a main node, a first cell represents the probability that the current conditional main and auxiliary cell change process estimated by the main node reaches a candidate auxiliary node; aiming at a conditional primary and secondary cell change process initiated by a secondary node, a first cell represents the probability of the conditional primary and secondary cell change process to reach a candidate secondary node estimated by the secondary node (namely, a source secondary node) requesting to initiate the conditional primary and secondary cell change, and the secondary node requesting to initiate the conditional primary and secondary cell change sends the first cell to a primary node through a primary and secondary cell change demand signaling, and then the primary node sends the first cell to the corresponding candidate secondary node.
And the MN or the source SN estimates the value of the first cell according to the information such as the success/failure information of the historical conditional main and auxiliary cell adding/changing process, the position information, the track information and the direction information of the user equipment, the reference signal receiving quality of the candidate auxiliary node and the like, namely the probability that the conditional main and auxiliary cell adding/changing process reaches the candidate auxiliary node. Wherein, in respect of the individual influence of the single influencing factor of the first cell: the success rate of the addition/change process of the primary and secondary cells under the historical condition is higher, the arrival probability is higher, and otherwise, the arrival probability is lower; the motion direction of the user equipment faces the candidate auxiliary nodes, the closer the distance is, the higher the arrival probability is, and otherwise, the smaller the arrival probability is; the better the reference signal reception quality of the candidate secondary node, the greater the arrival probability of the candidate secondary node, and conversely, the smaller the arrival probability of the candidate secondary node. The integrated influence of the plurality of influencing factors of the first cell may be determined comprehensively, for example, according to the plurality of influencing factors and the influence weights of the respective influencing factors.
The first cell may be an integer value, for example, ranging from 0 to 100. For example, when the value of the first cell is 50, it indicates that the probability that the MN or the source SN considers that the candidate SN will be finally selected as the target SN in the current conditional primary and secondary cell addition/change process is 50%.
According to different MR-DC techniques, the secondary node Addition Request is, for example, a SgNB Addition Request (SgNB Addition Request) or a SN Addition Request (SN Addition Request), which carries the first and third information elements. The third information element indicates that the request is a secondary node add request (a request to implement conditional primary and secondary cell addition or change). The first cell indicates the probability that the current conditional primary and secondary cell addition/change flow estimated by the master node or source SN reaches the candidate secondary node. SgNB represents the secondary node in EN-DC, SN represents the secondary node in NE-DC or NR-DC.
The candidate SN may decide whether to accept the secondary node addition request based on the first information element. For example, if the value of the first cell is greater than 50, that is, the probability of arrival is greater than 50%, the request for adding the secondary node is accepted, and if the value of the first cell is not greater than 50, that is, the probability of arrival is less than or equal to 50%, the request for adding the secondary node is rejected.
The candidate SN may decide whether to accept the secondary node addition request according to the first information element and in combination with its own load. For example, in the case where the current load of the candidate secondary node is so large as to exceed the preset load: if the probability that the current condition main and auxiliary cell adding/changing process reaches the candidate auxiliary node is greater than or equal to the preset probability, the candidate auxiliary node receives an auxiliary node adding request; and if the probability that the addition/change process of the main and auxiliary cells reaches the candidate auxiliary node is smaller than the preset probability, the candidate auxiliary node rejects the auxiliary node addition request. For another example, when the current load of the candidate secondary node is large enough to exceed the preset load, if the probability that the current conditional primary and secondary cell addition/change procedure reaches the candidate secondary node is greater than or equal to the preset probability, and the probability that the conditional primary and secondary cell addition/change procedure related to the current load reaches the candidate secondary node is smaller than the preset value, the candidate secondary node accepts the secondary node addition request. Therefore, the candidate auxiliary node can properly receive some overloaded access requests based on the first information element, the utilization rate of resources is improved, and the waste of cache resources at the candidate SN side is avoided. Some examples are listed below.
Example 1: when the cell Estimated Arrival Probability is 10, it indicates that the Probability that the current UE finally selects the candidate SN cell (referred to as "candidate cell") for access is 10%, and if the resource load of the candidate SN is larger at this time, the SgNB/SN Addition Request may be rejected.
Example 2: when the cell Estimated Arrival Probability is 80, it indicates that the Probability that the current UE finally selects the candidate SN cell for access is 80%, and if the resource load of the candidate SN is larger at this time, but based on the traffic prediction function, there is resource release on the candidate SN side in a future period of time, the candidate SN/SN Addition Request may be selected to be accepted.
Example 3: if the candidate SN receives 2 SgNB/SN Addition requests simultaneously, where the first cell Estimated Arrival Probability in the Request for UE1 is 80, the first cell Estimated Arrival Probability in the Request for UE2 is 10, and the resource load of the candidate SN is large, the candidate SN may choose to accept the SgNB/SN Addition Request for UE1 and reject the SgNB/SN Addition Request for UE 2.
Example 4: the SN currently accepts a plurality of SgNB/SN Addition requests with low arrival probability (for example, 0-20%), more resources are reserved for the users, the resource condition of the users is tense, the users do not conventionally suggest to accept a new access Request, but the SN can accept the new access Request because the arrival probability of the new SgNB/SN Addition Request is 80%. By the method, the resource utilization rate of the SN side can be improved, and the condition of SN resource waste caused by receiving more SgNB/SN Addition requests with lower actual arrival probability but not being actually applied is relieved.
The second cell is described below.
If the candidate SN receives the secondary node Addition Request sent by the MN, a second cell (for example, Maximum number of Conditional PSCell Addition provisions) is added to a secondary node Addition Request response (for example, SgNB/SN Addition Request acknowledgement) fed back to the MN, where the second cell represents the Maximum number of Conditional primary and secondary cell Addition/change flows that the candidate secondary node can support for the user equipment. Because the MN can initiate a Conditional PSCell Addition/Change procedure to multiple logical cells of a candidate SN, the second cell serves to inform the MN of the resource state of the candidate SN side, and prevent the MN from sending excessive Conditional PSCell Addition/Change procedures for a certain UE to the candidate SN, thereby preventing the SN side from being occupied with excessive resources. Specifically, the MN determines whether the number of conditional primary and secondary cell addition/change flows for the UE and the candidate SN reaches a maximum number; if the maximum number is not reached, the auxiliary node adding request can be sent to the candidate auxiliary node again aiming at the user equipment next time; if the maximum number has been reached, no further secondary node addition request is sent to the candidate secondary node for the user equipment the next time.
The candidate auxiliary node determines the size of the maximum number indicated by the second information element according to the current load of the candidate auxiliary node and the received UE context information (such as the size of the arrival probability indicated by the first information element). Wherein, in respect of the individual influence of the single influencing factor of the second cell: the smaller the current load of the candidate auxiliary node is, the larger the value of the second cell is, otherwise, the smaller the value of the second cell is; the larger the arrival probability indicated by the first cell is, the larger the value of the second cell is, and conversely, the smaller the value of the second cell is. The integrated influence of the plurality of influencing factors of the second cell may be determined comprehensively, for example, based on the plurality of influencing factors and the influence weights of the respective influencing factors.
The second cell may be an integer value, for example, ranging from 0 to M. M is the maximum number of Conditional PSCell Addition/Change flows that can be supported from the SN capability.
According to different MR-DC techniques: in the EN-DC, if the auxiliary node adding Request is an SgNB Addition Request, the auxiliary node adding Request response fed back after the candidate SN receives the Request is an SgNB Addition Request Acknowledge; in NE-DC or NR-DC, if the auxiliary node adding Request is SN Addition Request, the auxiliary node adding Request response fed back after the candidate SN accepts the Request is SN Addition Request acknowledgement.
A primary and secondary cell addition or change method based on the condition of the first information element and/or the second information element is described below in conjunction with fig. 2A and 2B. The conditional primary and secondary cell addition or change method can be applied to MR-DC scenarios such as EN-DC, NE-DC, NR-DC, etc. If the PScell is added, a Conditional PScell Addition method is used; if the PScell is changed, the Conditional PScell Change method is used.
Fig. 2A is a flowchart illustrating a conditional primary and secondary cell addition method according to some embodiments of the disclosure.
As shown in fig. 2A, the Conditional primary and secondary cell Addition (Conditional PScell Addition) method includes:
step 11: and the MN configures the UE for measurement, and the UE measures surrounding cells and reports a measurement report to the MN.
Step 12: the MN determines whether to use a Conditional PScell Addition procedure for the UE according to the measurement report and an RRM (Radio Resource Management) state.
For the requirement of the current service of the UE on the reliability, if the requirement of the current service reliability of the UE is high, the Conditional PScell Addition process is selected to be used, otherwise, the Conditional PScell Addition process is not selected to be used.
Further, from the measurement report, it can be determined whether there is a candidate SN whose reference signal reception quality satisfies the condition. And if the measurement report reported by the UE indicates that the signal reception strength of the SN is greater than a certain threshold, the SN is a candidate SN. There may be one or more candidate SNs.
Step 13: if the MN decides to use the Conditional PScell Addition flow, an SgNB/SN Addition Request is sent to each candidate SN with the reference signal received quality meeting the condition according to the measurement report, wherein the SgNB/SN Addition Request can carry a first cell and a third cell.
The value of the first cell indicates the Probability (Estimated Arrival Probability) of the current conditional primary-secondary cell addition procedure to reach the candidate secondary node, which is Estimated by the primary node MN. The estimation method of the arrival probability is described in the foregoing, and is not described herein again.
The indicator Conditional PScell Addition/Change indicator in the third cell indicates that the Request is a Conditional primary and secondary cell Addition Request.
There may be one or more candidate SNs that satisfy the condition, and if there are multiple candidate SNs, such as candidate SN1 and candidate SN2 shown in the figure, SgNB/SN Addition Request may be sent to each of the multiple candidate SNs.
Step 14: and the candidate SN performs access control and judges whether to accept the current auxiliary node adding Request SgNB/SN Addition Request.
As described above, the candidate SN determines whether to accept the current addition request of the secondary node according to the value of the first information element and the load of the candidate secondary node. For a specific decision method, reference may be made to the foregoing description, which is not repeated herein.
Step 15: if the candidate SN receives the current auxiliary node adding Request SgNB/SN adding Request, reserving corresponding resources, and feeding back the auxiliary node adding Request response SgNB/SN adding Request acknowledgement to the MN, wherein the candidate SN can carry a second cell.
The value of the second cell indicates the Maximum number of candidate SNs (Maximum number of Conditional PSCell Addition/Change predictions) for the Conditional primary and secondary cell Addition/Change flows that the UE can support. The method for determining the maximum number of candidate SNs is described in the foregoing and will not be described herein.
For the next conditional primary and secondary cell addition/change flows of the UE and the candidate SN, the MN judges whether the number of the conditional primary and secondary cell addition/change flows of the UE and the candidate SN reaches the maximum number or not; if the maximum number is not reached, the auxiliary node adding request can be sent to the candidate auxiliary node again aiming at the user equipment next time; if the maximum number has been reached, no further secondary node addition request is sent to the candidate secondary node for the user equipment the next time. Avoid initiating too many Conditional PSCell Addition/Change flows to the SN.
Step 16: the MN issues configuration information of the Conditional PSCell Addition to the UE through an RRC Reconfiguration message, where the configuration information includes a Conditional PSCell Addition execution condition of the candidate SN cell and a configuration parameter of the candidate SN cell.
Step 17-18: the UE measures the candidate SN cells. When a certain candidate SN cell meets the Conditional PSCell Addition execution condition, taking the candidate SN cell as a target SN cell (namely a main and auxiliary cell of a target SN), and directly initiating random access and SN state synchronization to the target SN cell according to the configuration parameters of the target SN cell.
It should be noted that, in the present embodiment, the SgNB/SN Addition Request carries the first cell, and the SgNB/SN Addition Request acknowledgement carries the second cell, but it can be understood that: or the first cell can be carried by the SgNB/SN Addition Request, the second cell is not carried by the SgNB/SN Addition Request, the first cell is not carried by the SgNB/SN Addition Request, and the second cell is carried by the SgNB/SN Addition Request.
In the conditional primary and secondary cell adding process of the embodiment, the resource at the SN side can be more reasonably applied by the first cell interacted between the MN and the SN; through the second cell interacted between the MN and the SN, the MN can also learn the resource state of the SN side, and the subsequent initiation of excessive Conditional PSCell Addition/Change flow to the SN is avoided.
Fig. 2B is a flow chart of a conditional primary and secondary cell change method according to some embodiments of the disclosure. The method for changing the conditional primary and secondary cells comprises two conditions of a conditional primary and secondary cell change process initiated by a primary node and a conditional primary and secondary cell change process initiated by a secondary node (source secondary node).
As shown in fig. 2B, according to the difference of the initiator, if the source SN initiates the Conditional primary and secondary cell Change (Conditional PScell Change) method, the method includes: in steps 20-210, if the MN initiates the method, the Conditional primary and secondary cell Change (Conditional PScell Change) method includes: steps 21-210.
Step 20: the source SN sends a secondary node Change request SgNB/SN Change Required, which may carry the first and third cells, to the MN.
As previously mentioned, this step 20 is performed selectively, depending on the initiator.
As described above, for the conditional primary and secondary cell change procedure initiated by the master node, the first cell indicates the probability that the current conditional primary and secondary cell change procedure estimated by the master node reaches the candidate secondary node; for a conditional primary and secondary cell change procedure initiated by a secondary node, the first information element represents the probability that the current conditional primary and secondary cell change procedure estimated by the secondary node (i.e., the source secondary node) requesting initiation of the conditional primary and secondary cell change reaches the candidate secondary node.
The indicator Conditional PScell Addition/Change indicator in the third cell indicates that the Request is a Conditional primary and secondary cell Change Request.
Step 21: and the MN configures the UE for measurement, and the UE measures surrounding cells and reports a measurement report to the MN.
Step 22: the MN determines whether to use a Conditional PScell Change procedure for the UE according to the measurement report and an RRM (Radio Resource Management) state.
For the requirement of the current service of the UE on reliability, if the requirement of the current service reliability of the UE is high, the Conditional PScell Change procedure is selected to be used, otherwise, the Conditional PScell Change procedure may be selected not to be used.
Further, from the measurement report, it can be determined whether there is a candidate SN whose reference signal reception quality satisfies the condition. And if the measurement report reported by the UE indicates that the signal reception strength of the SN is greater than a certain threshold, the SN is a candidate SN. There may be one or more candidate SNs.
Step 23: if the MN decides to use the Conditional PScell change process, a SgNB/SN Addition Request is sent to each candidate SN with the reference signal received quality meeting the condition according to the measurement report, wherein the SgNB/SN Addition Request can carry a first cell and a third cell.
There may be one or more candidate SNs satisfying the condition, and if there are a plurality of candidate SNs, such as candidate SN1 and candidate SN2 shown in the figure, SgNB/SN Addition Request may be sent to each of the plurality of candidate SNs.
And step 24: and the candidate SN performs access control and judges whether to accept the current auxiliary node adding Request SgNB/SN Addition Request.
As described above, the candidate SN determines whether to accept the current request for adding the secondary node according to the value of the first cell and the load of the candidate secondary node. For a specific decision method, reference may be made to the foregoing description, which is not repeated herein.
Step 25: if the candidate SN receives the current auxiliary node adding Request SgNB/SN Addition Request, reserving corresponding resources, and feeding back an auxiliary node adding Request response SgNB/SN Addition Request acknowledgement to the MN, wherein the second cell can be carried.
The value of the second cell indicates the Maximum number of candidate SNs (Maximum number of Conditional PSCell Addition/Change predictions) for the Conditional primary and secondary cell Addition/Change flows that the UE can support. The method for determining the maximum number of candidate SNs is described in the foregoing and will not be described herein.
For the next conditional primary and secondary cell addition/change flows of the UE and the candidate SN, the MN judges whether the number of the conditional primary and secondary cell addition/change flows of the UE and the candidate SN reaches the maximum number or not; if the maximum number is not reached, the auxiliary node adding request can be sent to the candidate auxiliary node again aiming at the user equipment next time; if the maximum number has been reached, no further secondary node addition requests are sent to the candidate secondary nodes for the user equipment the next time. Avoid initiating too many Conditional PSCell Addition/Change flows to the SN.
Step 26-27: MN indicates source SN (source SN) to release connection with UE, and source SN receives feedback confirmation (Ack) signaling and releases connection with UE.
Step 28: the MN issues configuration information of the Conditional PSCell Change to the UE through an RRC Reconfiguration message, where the configuration information includes execution conditions of the Conditional PSCell Change of the candidate SN cell and configuration parameters of the candidate SN cell.
Step 29-210: the UE measures the candidate SN cells. When a certain candidate SN cell meets the execution condition of the Conditional PSCell Change, the candidate SN cell is taken as a target SN cell (namely a main and auxiliary cell of the target SN), and random access and SN state synchronization are directly initiated to the target SN cell according to the configuration parameters of the target SN cell.
It should be noted that, in the present embodiment, the SgNB/SN Addition Request carries the first cell, and the SgNB/SN Addition Request acknowledgement carries the second cell, but it can be understood that: or the SgNB/SN Addition Request carries the first cell, the SgNB/SN Addition Request acknowledgement does not carry the second cell, or the SgNB/SN Addition Request does not carry the first cell, and the SgNB/SN Addition Request acknowledgement carries the second cell.
In the conditional primary and secondary cell changing process of the above embodiment, the resource at the SN side can be more reasonably applied by the first cell interacted between the MN and the SN; through the second cell interacted between the MN and the SN, the MN can also learn the resource state of the SN side, and the excessive Conditional PSCell Addition flow initiated to the SN is avoided.
Fig. 3 is a schematic diagram of a communication system of some embodiments of the present disclosure.
As shown in fig. 3, the communication system 30 includes: a primary node 31 and several secondary nodes 32. The primary node 31 and the secondary node 32 are described below in conjunction with fig. 4 and 5, respectively.
Fig. 4 is a schematic diagram of a master node of some embodiments of the present disclosure.
As shown in fig. 4, the master node 31 includes: a memory 311; and a processor 312 coupled to the memory, the processor configured to execute a conditional primary and secondary cell addition or change method performed by the primary node 31 based on instructions stored in the memory.
For example, in a multi-access dual-connection scenario, for a user equipment that wants to perform a conditional primary and secondary cell addition/change procedure, a primary node sends a secondary node addition request to a corresponding candidate secondary node, where the secondary node addition request carries a first cell, and the first cell indicates a probability that the current conditional primary and secondary cell addition/change procedure estimated by the primary node or a source SN reaches the candidate secondary node; the master node receives a slave node adding request response returned by the candidate slave node aiming at the slave node adding request so as to indicate whether the candidate slave node accepts the slave node adding request or not; and under the condition that the candidate auxiliary node accepts the auxiliary node adding request, the main node sends configuration information of conditional main and auxiliary cell adding/changing to the user equipment, so that the user equipment selects a target auxiliary node from the candidate auxiliary node according to the configuration information and initiates random access to the main and auxiliary cells of the target auxiliary node.
For example, the secondary node addition request response carries a second information element, where the second information element represents the maximum number of conditional primary and secondary cell addition/change flows that the candidate secondary node can support for the ue; the master node judges whether the number of the adding/changing processes of the conditional primary and secondary cells aiming at the user equipment and the candidate secondary nodes reaches the maximum number; if the maximum number is not reached, sending an auxiliary node adding request to the candidate auxiliary node again aiming at the user equipment next time; if the maximum number has been reached, no more secondary node addition requests are sent to the candidate secondary nodes for the user equipment the next time.
For example, the master node or the source SN estimates the probability that the conditional primary and secondary cell add/change procedure reaches the candidate secondary node according to at least one of the success/failure information of the historical conditional primary and secondary cell add/change procedure, the location information of the user equipment, the trajectory information, the direction information, and the reference signal reception quality of the candidate secondary node.
For example, the primary node sends a secondary node release request to a source secondary node of the user equipment; and the main node receives a secondary node release request response returned by the source secondary node.
Fig. 5 is a schematic diagram of a secondary node of some embodiments of the present disclosure.
As shown in fig. 5, the secondary node 32 includes: a memory 321; and a processor 322 coupled to the memory, the processor configured to perform a conditional primary and secondary cell addition or change method performed by the secondary node 32 based on instructions stored in the memory.
For example, a candidate secondary node receives a secondary node addition request sent by a master node for a user equipment which wants to perform a conditional primary and secondary cell addition/change procedure, where the secondary node addition request carries a first cell, and the first cell indicates a probability that the current conditional primary and secondary cell addition/change procedure estimated by the master node or a source SN reaches the candidate secondary node; the candidate auxiliary node returns an auxiliary node adding request response to the main node aiming at the auxiliary node adding request so as to indicate whether the candidate auxiliary node accepts the auxiliary node adding request; the candidate auxiliary nodes reserve corresponding resources under the condition of accepting the auxiliary node adding request; and responding to random access initiated by the user equipment to a primary cell and a secondary cell of the target secondary node by the target secondary node selected by the user equipment in the candidate secondary nodes, wherein the target secondary node is selected from the candidate secondary nodes by the user equipment according to configuration information added/changed by the conditional primary cell and the secondary cell sent by the master node.
For example, the candidate secondary node determines whether to accept the secondary node addition request based on the first information element in combination with a load of the candidate secondary node.
For example, when the current load of the candidate secondary node is larger than a preset load, if the probability that the current conditional primary and secondary cell addition/change flow reaches the candidate secondary node is greater than or equal to a preset probability and the probability that the conditional primary and secondary cell addition/change flow related to the current load reaches the candidate secondary node is smaller than a preset value, the candidate secondary node accepts the secondary node addition request.
For example, in the case that the current load of the candidate secondary node is so large as to exceed a preset load: if the probability that the current condition main and auxiliary cell adding/changing process reaches the candidate auxiliary node is greater than or equal to the preset probability, the candidate auxiliary node receives the auxiliary node adding request; and if the probability that the current conditional main and auxiliary cell adding/changing flow reaches the candidate auxiliary node is smaller than the preset probability, the candidate auxiliary node rejects the auxiliary node adding request.
For example, the candidate secondary node carries a second information element in the secondary node addition request response, where the second information element indicates a maximum number of the candidate secondary node to add/change the procedure to the conditional primary and secondary cells that the user equipment can support, so that the primary node determines whether to send the secondary node addition request to the candidate secondary node again for the user equipment next time according to the maximum number.
For example, the candidate secondary node determines the size of the maximum number indicated by the second information element according to the current load and the size of the arrival probability indicated by the first information element.
The memories 311 and 321 may include, for example, a system memory, a fixed nonvolatile storage medium, and the like. The system memory stores, for example, an operating system, an application program, a Boot Loader (Boot Loader), and other programs.
Some embodiments of the present disclosure propose a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the conditional primary and secondary cell addition or change method of the various embodiments.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more non-transitory computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to some embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is meant to be illustrative of the preferred embodiments of the present disclosure and not to be taken as limiting the disclosure, and any modifications, equivalents, improvements and the like that are within the spirit and scope of the present disclosure are intended to be included therein.
Claims (17)
1. A method for adding or changing a conditional primary cell and a conditional secondary cell is characterized by comprising the following steps:
under a multi-access dual-connection scene, aiming at user equipment which is to perform a conditional main and auxiliary cell adding/changing process, a main node sends an auxiliary node adding request to a corresponding candidate auxiliary node, wherein the auxiliary node adding request carries a first cell which represents the estimated probability that the conditional main and auxiliary cell adding/changing process reaches the candidate auxiliary node;
the master node receives a slave node adding request response returned by the candidate slave node aiming at the slave node adding request so as to indicate whether the candidate slave node accepts the slave node adding request or not;
and under the condition that the candidate auxiliary nodes accept the auxiliary node adding request, the main node sends configuration information of conditional main and auxiliary cell adding/changing to the user equipment, so that the user equipment selects a target auxiliary node from the candidate auxiliary nodes according to the configuration information and initiates random access to the main and auxiliary cells of the target auxiliary node.
2. The method of claim 1,
the secondary node addition request response carries a second information element, wherein the second information element represents the maximum number of conditional primary and secondary cell addition/change processes which can be supported by the candidate secondary node aiming at the user equipment;
the method further comprises the following steps:
the master node judges whether the number of the adding/changing processes of the conditional primary and secondary cells aiming at the user equipment and the candidate secondary nodes reaches the maximum number;
if the maximum number is not reached, sending an auxiliary node adding request to the candidate auxiliary node again aiming at the user equipment next time;
and if the maximum number is reached, no secondary node adding request is sent to the candidate secondary node for the user equipment next time.
3. The method of claim 1,
and the main node or the auxiliary node requesting to initiate the change of the conditional main and auxiliary cells estimates the probability of the adding/changing process of the conditional main and auxiliary cells reaching the candidate auxiliary node according to at least one of the success/failure information of the adding/changing process of the historical conditional main and auxiliary cells, the position information, the track information, the direction information and the reference signal receiving quality of the candidate auxiliary node, and the auxiliary node requesting to initiate the change of the conditional main and auxiliary cells sends the first cell to the main node through a main and auxiliary cell change requirement signaling.
4. The method of claim 1, further comprising:
the main node sends an auxiliary node release request to a source auxiliary node of the user equipment;
and the main node receives a secondary node release request response returned by the source secondary node.
5. The method of claim 1,
aiming at the addition process of the conditional main and auxiliary cells, the first information element represents the probability that the current addition process of the conditional main and auxiliary cells estimated by the main node reaches the candidate auxiliary node;
aiming at a conditional primary and secondary cell change process initiated by a main node, the first information element represents the probability that the current conditional primary and secondary cell change process estimated by the main node reaches the candidate secondary node;
aiming at the condition main and auxiliary cell change process initiated by the auxiliary node, the first information element represents the probability that the current condition main and auxiliary cell change process estimated by the auxiliary node requesting to initiate the condition main and auxiliary cell change reaches the candidate auxiliary node, and the auxiliary node requesting to initiate the condition main and auxiliary cell change sends the first information element to the main node through the main and auxiliary cell change demand signaling.
6. A method for adding or changing a conditional primary cell and a conditional secondary cell is characterized by comprising the following steps:
receiving an auxiliary node adding request which is sent by a main node aiming at user equipment needing a conditional main and auxiliary cell adding/changing process and carries a first cell by a candidate auxiliary node, wherein the first cell represents the estimated probability of the conditional main and auxiliary cell adding/changing process reaching the candidate auxiliary node;
the candidate auxiliary node returns an auxiliary node adding request response to the main node aiming at the auxiliary node adding request so as to indicate whether the candidate auxiliary node accepts the auxiliary node adding request;
the candidate auxiliary nodes reserve corresponding resources under the condition of accepting the auxiliary node adding request;
and responding to random access initiated by the user equipment to the main and auxiliary cells of the target auxiliary node by the target auxiliary node selected by the user equipment in the candidate auxiliary nodes, wherein the target auxiliary node is selected from the candidate auxiliary nodes by the user equipment according to the configuration information added/changed by the conditional main and auxiliary cells sent by the main node.
7. The method of claim 6, further comprising:
and the candidate auxiliary node determines whether to accept the auxiliary node adding request or not according to the first information element and by combining the load of the candidate auxiliary node.
8. The method of claim 7,
and under the condition that the current load of the candidate auxiliary node is larger than the preset load, if the probability that the current conditional main and auxiliary cell adding/changing process reaches the candidate auxiliary node is larger than or equal to the preset probability and the probability that the conditional main and auxiliary cell adding/changing process related to the current load reaches the candidate auxiliary node is smaller than the preset value, the candidate auxiliary node receives the auxiliary node adding request.
9. The method of claim 7,
when the current load of the candidate secondary node is larger than a preset load: if the probability that the current conditional main and auxiliary cell adding/changing flow reaches the candidate auxiliary node is larger than or equal to the preset probability, the candidate auxiliary node receives the auxiliary node adding request; and if the probability that the current condition main and auxiliary cell adding/changing process reaches the candidate auxiliary node is less than the preset probability, the candidate auxiliary node refuses the auxiliary node adding request.
10. The method of claim 6,
the candidate auxiliary node carries a second information element in the auxiliary node adding request response, wherein the second information element represents the maximum number of adding/changing processes of the candidate auxiliary node for the condition main and auxiliary cells which can be supported by the user equipment, so that the main node judges whether to send the auxiliary node adding request to the candidate auxiliary node again for the user equipment at the next time according to the maximum number.
11. The method of claim 10,
and the candidate auxiliary nodes determine the maximum quantity indicated by the second information element according to the current load and the arrival probability indicated by the first information element.
12. The method of claim 6,
aiming at the addition process of the conditional main and auxiliary cells, the first information element represents the probability that the current addition process of the conditional main and auxiliary cells estimated by the main node reaches the candidate auxiliary node;
aiming at a conditional primary and secondary cell change process initiated by a main node, the first information element represents the probability that the current conditional primary and secondary cell change process estimated by the main node reaches the candidate secondary node;
aiming at the condition main and auxiliary cell change process initiated by the auxiliary node, the first information element represents the probability that the current condition main and auxiliary cell change process estimated by the auxiliary node requesting to initiate the condition main and auxiliary cell change reaches the candidate auxiliary node, and the auxiliary node requesting to initiate the condition main and auxiliary cell change sends the first information element to the main node through the main and auxiliary cell change demand signaling.
13. The method according to any one of claims 1 to 12,
the auxiliary node adding request is a SgNB adding request or a SN adding request, wherein a first information element and a third information element are carried, the third information element indicates that the request is a conditional main and auxiliary cell adding request, the SgNB indicates an auxiliary node in EN-DC, and the SN indicates an auxiliary node in NE-DC or NR-DC.
14. A master node, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the conditional primary and secondary cell addition or change method of any of claims 1-5 based on instructions stored in the memory.
15. A secondary node, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the conditional primary and secondary cell addition or change method of any of claims 6-13 based on instructions stored in the memory.
16. A communication system, comprising:
the master node of claim 14; and
the secondary node of claim 15.
17. A non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the conditional primary and secondary cell addition or change method of any of claims 1-13.
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