CN115567915B - Physical cell identity configuration method, communication system and mobile IAB node - Google Patents
Physical cell identity configuration method, communication system and mobile IAB node Download PDFInfo
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- CN115567915B CN115567915B CN202211469541.XA CN202211469541A CN115567915B CN 115567915 B CN115567915 B CN 115567915B CN 202211469541 A CN202211469541 A CN 202211469541A CN 115567915 B CN115567915 B CN 115567915B
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Abstract
The embodiment of the application discloses a physical cell identifier configuration method, a communication system, a mobile IAB node, a communication device and a readable storage medium. The mobile IAB node configures the MT function module through the wireless measurement configuration information; detecting the synchronous signals of a plurality of adjacent physical cells on the wireless resources corresponding to the DU function module through the MT function module; sending the detected physical cell identifier and the corresponding wireless measurement index to an IAB host, and obtaining a second physical cell identifier which is redistributed by the IAB host in combination with an adjacent physical cell identifier conflict prevention mechanism; and changing the first physical cell identifier corresponding to the DU function module into a second physical cell identifier, so that the conflict between the physical cell identifier corresponding to the mobile IAB node and the adjacent physical cell identifier is reduced, and the signal interference of the adjacent physical cell is greatly reduced.
Description
Technical Field
The embodiment of the application relates to the technical field of wireless communication networks, in particular to a physical cell identifier configuration method, a communication system and a mobile IAB node.
Background
According to the specification of 3GPP (3 rd Generation Partnership Project) R16, the initial Generation IAB (Integrated Access Backhaul) feature is designed based on the assumption that all IAB nodes are statically deployed. In an IAB network, a physical cell corresponding to each IAB node has a specific physical cell identifier, and the physical cell identifier can be reused by a plurality of geographically separated cells in the network. Since the distribution of the cells is fixed, the physical cell identifier of each physical cell is set in a pre-configured manner, so that the physical cell identifier of the physical cell corresponding to the stationary IAB node is different from the physical cell identifier of the neighboring physical cell.
With the development of mobile communication technology and traffic technology, in order to meet the demand of instant messaging during riding in a vehicle, the IAB network starts to introduce mobile IAB nodes, which can move to different geographical locations within the coverage area of the IAB network. Although the mobile physical cell corresponding to the mobile IAB node uses a physical cell identifier different from the surrounding physical cells when the cell is opened, in the moving process of the mobile IAB node, the neighboring physical cells of the mobile IAB node change with the change of the position of the mobile IAB node, and if the physical cell identifier of a certain cell in the neighboring physical cells after the change is the same as the physical cell identifier of the mobile physical cell corresponding to the mobile IAB node, a physical cell identifier conflict between the physical cell identifier and the neighboring physical cells is generated, thereby causing an obvious communication interference problem.
Disclosure of Invention
In order to solve the problem of obvious communication interference caused by physical cell identifier conflict between a physical cell identifier corresponding to a mobile IAB node and an adjacent physical cell, embodiments of the present application provide a physical cell identifier configuration method, a communication system, and a mobile IAB node, so that conflict between a physical cell identifier corresponding to a mobile IAB node and an adjacent physical cell identifier is reduced, and signal interference of an adjacent physical cell is reduced to a greater extent.
In a first aspect, an embodiment of the present application provides a method for configuring a physical cell identifier, where the method is applied to a mobile IAB node, and a DU function module of the mobile IAB node currently corresponds to a first physical cell identifier, and the method includes:
receiving wireless measurement configuration information sent by an IAB host;
configuring an MT functional module according to the wireless measurement configuration information;
detecting synchronous signals of a plurality of adjacent physical cells on wireless resources corresponding to the DU function module through the configured MT function module;
sending the detected physical cell identifier corresponding to each of the adjacent physical cells and the corresponding wireless measurement index to the IAB host so that the IAB host sends a physical cell identifier update configuration message, wherein the wireless measurement index includes the signal strength of the corresponding physical cell;
receiving the physical cell identifier update configuration message, wherein the physical cell identifier update configuration message includes a second physical cell identifier, and the second physical cell identifier is obtained by the IAB host through reallocation according to the physical cell identifier corresponding to each adjacent physical cell, the corresponding wireless measurement index and an adjacent physical cell identifier collision prevention mechanism;
changing the first physical cell identifier corresponding to the DU function module into the second physical cell identifier according to the physical cell identifier update configuration message;
and after the first physical cell identifier is changed into the second physical cell identifier, sending a response message to the IAB host.
In a second aspect, an embodiment of the present application further provides a communication system, including an IAB host and a mobile IAB node;
the IAB host is used for sending wireless measurement configuration information to a mobile IAB node corresponding to an event after the event of the change of the topology structure of the IAB network is identified, wherein a DU function module of the mobile IAB node corresponds to a first physical cell identifier at present;
the mobile IAB node is used for receiving wireless measurement configuration information sent by an IAB host; configuring an MT functional module according to the wireless measurement configuration information; detecting synchronous signals of a plurality of adjacent physical cells on wireless resources corresponding to the DU function module through the configured MT function module; sending the detected physical cell identifier corresponding to each of the adjacent physical cells and the corresponding wireless measurement index to the IAB host so that the IAB host sends a physical cell identifier update configuration message, wherein the wireless measurement index includes the signal strength of the corresponding physical cell;
the IAB host is further configured to, after reallocating the mobile IAB node to obtain a second physical cell identifier according to the physical cell identifier corresponding to each of the neighboring physical cells, the corresponding wireless measurement index, and the collision prevention mechanism for neighboring physical cell identifiers, send a physical cell identifier update configuration message to the mobile IAB node, where the physical cell identifier update configuration message includes the second physical cell identifier;
the mobile IAB node is further used for receiving the physical cell identifier updating configuration message sent by the IAB host; changing the first physical cell identity corresponding to the DU function module to the second physical cell identity according to the physical cell identity updating configuration message; and after the first physical cell identifier is changed into the second physical cell identifier, sending a response message to the IAB host.
In a third aspect, an embodiment of the present application further provides a mobile IAB node, including: a memory, a processor, and a program or instructions stored on the memory and executable on the processor, the program or instructions, when executed by the processor, implementing a physical cell identity configuration method as in any embodiment of the present application.
In the embodiment of the application, after the IAB host recognizes an event of an IAB network topology structure change, in order to avoid a conflict between a current first physical cell identifier of a Du function module of a mobile IAB node and an adjacent physical cell identifier, the mobile IAB node configures an MT function module by receiving wireless measurement configuration information sent by the IAB host; detecting synchronous signals of a plurality of adjacent physical cells on wireless resources corresponding to the DU function module through the configured MT function module; sending the physical cell identifier corresponding to each detected adjacent physical cell and the corresponding wireless measurement index to an IAB host, and obtaining a second physical cell identifier which is redistributed by the IAB host in combination with an adjacent physical cell identifier collision prevention mechanism; and changing the first physical cell identifier corresponding to the DU function module into a second physical cell identifier, so that the conflict between the physical cell identifier corresponding to the mobile IAB node and the adjacent physical cell identifier is reduced, and the signal interference of the adjacent physical cell is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of an exemplary IAB network;
FIG. 2 is a diagram of exemplary relationships between IAB nodes;
fig. 3 is a flowchart of a method for configuring a physical cell identifier according to an embodiment of the present application;
fig. 4 is a flowchart of reassigning a physical cell identifier by an IAB host according to an embodiment of the present application;
fig. 5 is a schematic diagram of a communication system according to an embodiment of the present application;
fig. 6 is a schematic diagram of a data transmission process of a communication system according to an embodiment of the present application.
Fig. 7 is a schematic diagram of a mobile IAB node according to an embodiment of the present application;
fig. 8 is a schematic diagram of a communication device according to an embodiment of the present application.
Detailed Description
The embodiments of the present application will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad embodiments of the present application. It should be further noted that, for convenience of description, only some structures related to the embodiments of the present application are shown in the drawings, not all of the structures are shown.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used are interchangeable under appropriate circumstances such that embodiments of the application can be practiced in sequences other than those illustrated or described herein, and the terms "first," "second," and the like are generally used herein in a generic sense to distinguish one object from another, and not to limit the number of objects, e.g., a first object can be one or more, nor can be interpreted to indicate or imply relative importance. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship. Furthermore, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
5G (5 th Generation Mobile Communication Technology, fifth Generation Mobile Communication Technology) is a new Generation broadband Mobile Communication Technology with the characteristics of high speed, low time delay and large connection, and 5G Communication facilities are network infrastructures for realizing man-machine-object interconnection. The IAB characteristic is an important characteristic of a wireless access network, and is mainly applied to a deployment scenario of an ultra-dense networking. The backhaul link of conventional wireless networks mostly employs wired cables or optical fibers. In the scene of intensive deployment of small base stations, the deployment and maintenance costs of cables and optical fibers are high, the use efficiency is low, and the economic benefit is poor. In order to avoid the above problems, the release 5G NR r16 introduces the concept of wireless backhaul, that is, the backhaul link and the access link use the same wireless transmission technology, share the same frequency point, and multiplex the resources in time division, frequency division, and space division manners.
Fig. 1 is a network structure of an exemplary IAB network, and as shown in fig. 1, a terminating node on the IAB network side is referred to as an IAB host, and provides network access for an IAB node or a UE (User Equipment) through a backhaul or an access link. The IAB host includes a CU (central Unit) and a DU (Distributed Unit), which may also be referred to as an IAB-donor-CU and an IAB-donor-DU, wherein the IAB-donor-CU and the IAB-donor-DU are connected via a wired network. Each node supporting wireless backhaul is called an IAB node, which may also be referred to as an IAB-node, and the IAB node is connected with an IAB host and the IAB node through wireless backhaul.
Fig. 2 is a diagram illustrating an exemplary relationship between IAB nodes, and as shown in fig. 2, an IAB node includes at least one DU function module, which may also be referred to as an IAB-DU, and the IAB-DU may serve a general UE and an IAB subnode. The IAB node further includes an MT (Mobile Terminal) function module, which may also be referred to AS an IAB-MT, and the IAB-MT may support functions such AS a UE physical layer, an AS layer, an RRC layer, and an NAS layer, and implement a radio connection function with an IAB parent node. The last hop neighbor node of the IAB-MT is called an IAB parent node, which may be an IAB node or an IAB-donor. The next-hop neighbor node of the IAB-DU is called an IAB child node, and the IAB child node can only be another IAB node. The direction to the IAB parent node is referred to as the upstream direction and the direction to the IAB child node is referred to as the downstream direction.
In a continuous coverage wireless network, the physical cell identity of a cell is an important parameter setting. The physical cell identification is used as a basic factor to participate in the construction of the wireless signal, thereby distinguishing the signals of different physical cells and avoiding the confusion of the signals of the adjacent cells. For a wireless air interface of 5G NR, the physical cell identifier allocation of each physical cell mainly follows the following basic principle: between adjacent cells, the results of modulo three operation and modulo thirty operation of the cell identifier should be guaranteed to be different, where modulo three is the operation of taking a residue of three and modulo thirty is the operation of taking a residue of thirty. In a network topology structure composed of IAB nodes, the allocation of physical cell identifiers also needs to follow this principle, where each Du function module in an IAB node corresponds to a physical cell, and each physical cell also corresponds to a physical cell identifier.
With the development of mobile communication technology and traffic technology, in order to meet the demand of instant messaging during riding in a vehicle, the IAB network starts to introduce mobile IAB nodes, which can move to different geographical locations within the coverage area of the IAB network. Although the mobile physical cell corresponding to the mobile IAB node uses a physical cell identifier different from the surrounding physical cells when the cell is opened, in the moving process of the mobile IAB node, the neighboring physical cells of the mobile IAB node change with the change of the position of the mobile IAB node, and if the physical cell identifier of a certain cell in the neighboring physical cells after the change is the same as the physical cell identifier of the mobile physical cell corresponding to the mobile IAB node, a physical cell identifier conflict between the physical cell identifier and the neighboring physical cells is generated, thereby causing an obvious communication interference problem.
Based on this, embodiments of the present application provide a physical cell identifier configuration method, a communication system, a mobile IAB node, a communication device, and a readable storage medium, so as to solve the problem of significant communication interference caused by a physical cell identifier corresponding to the mobile IAB node colliding with a physical cell identifier between adjacent physical cells.
Fig. 3 is a flowchart of a method for configuring a physical cell identifier according to an embodiment of the present application, where the method is applied to a mobile IAB node, and a DU function module of the mobile IAB node currently corresponds to a first physical cell identifier, and includes the following steps:
s301: and receiving wireless measurement configuration information sent by the IAB host.
It should be noted that, the DU function module of the mobile IAB node currently corresponds to the first physical cell identifier, when the mobile IAB node moves, the neighboring physical cell may generate a corresponding topology change, and at this time, a conflict between the first physical cell identifier currently corresponding to the DU function module of the mobile IAB node and the neighboring physical cell identifier may occur, so that, in order to avoid communication interference caused by the conflict to a greater extent, after the IAB host recognizes an event of the change of the topology structure of the IAB network, the physical cell identifier of the DU function module of the mobile IAB node needs to be re-determined to reduce the conflict with the neighboring physical cell identifier, so the IAB host sends wireless measurement configuration information to the mobile IAB node corresponding to the event to enable the mobile IAB node to start corresponding wireless measurement, and the wireless measurement configuration information received by the mobile IAB node is also used for performing related configuration on the wireless measurement.
In one embodiment, the radio measurement configuration information includes radio resource attributes corresponding to synchronization signals of a plurality of neighboring physical cells, and the radio resource attributes include frequency and time characteristics.
In another embodiment, in the measurement object cell MeasObjectNR, measurement parameters of the SSB need to be configured, including: frequency ssbFrequency, inter-subcarrier ssbSubcarrirSpacing, transmission timing smtc1, and the like, wherein the configuration of the SSB corresponds to the downstream link resource of the mobile IAB node but not the upstream link resource.
S302: and configuring the MT functional module according to the wireless measurement configuration information.
It should be noted that the mobile IAB node includes an MT function module and a DU function module, where the DU function module functions similarly to a conventional base station and plays a role of transmitting downlink signals, and the MT function module functions similarly to a terminal and plays a role of receiving downlink signals and transmitting uplink signals, so that the MT function module should play a role of measuring downlink synchronization signals, and therefore, the MT function module should be configured for received wireless measurement configuration information.
In one embodiment, performing the necessary configuration for the MT function, such as configuring measurement parameters of SSB for the downstream link resources of the mobile IAB node, includes: frequency ssbFrequency, sub-carrier ssbSubcarrierSpacing, transmission timing smtc1 and the like.
In another embodiment, a preferred configuration is performed for the MT function module, in the measurement object cell MeasObjectNR, the cellsToAddModList parameter for characterizing the neighbor cell add list parameter and the neighbor cell modification list parameter may be initialized to be null, because the cellsToAddModList parameter provides a reference list of the physical cell to be measured, i.e. the IAB network specifies the selection range of the physical cell to be measured, but in the relevant application scenario of the present application, it is not desirable to limit the selection of the MT function module for the physical cell to be measured, but to obtain the information of the neighbor physical cell according to the actual measurement, and also to be null for the smtc2 characterizing the SSB measurement timing configuration parameter, because the wireless measurement needs to know the information of the neighbor physical cell in real time, performing timing configuration is not favorable for obtaining information in real time, so that the relevant parameter is initialized to be null to match the mobility of the mobile IAB node, so that the changed set of neighbor physical cells can be detected more accurately, and the physical cells where communication interference may exist can be determined better.
S303: and detecting the synchronous signals of a plurality of adjacent physical cells on the wireless resources corresponding to the DU function module by the configured MT function module.
It is worth noting that for an IAB node, it is required to communicate with both a downstream UE or IAB child node in the role of a base station or parent node and an upstream parent node in the role of a child node. The radio resources used by the downstream-connected DU function module and the upstream-connected MT function module do not overlap, and need to be separated by time division, frequency division, or space division. For the conventional case, the radio measurement is performed by the MT function module aiming at its corresponding radio resource, and the MT function module detects a cell signal of a parent node and a neighbor cell signal of a parent node cell, however, in the application scenario of the present application, under the condition that the neighboring physical cells of the IAB node have topology change, the IAB network needs to know whether the physical cell identifier of the sibling cell corresponding to the DU function module will collide with the physical cell identifier of the neighboring physical cell, and therefore needs to detect a synchronization signal on the radio resource corresponding to the DU function module to find out a possible neighboring physical cell signal and its corresponding physical cell identifier. The physical cells controlled by the DU function module may share the same time-frequency resource with the adjacent physical cells, and the adjacent physical cells use different physical cell identifiers as factors for generating physical signals, so as to achieve the purpose of isolating mutual interference between signals, and therefore the synchronization signals of the physical cells should be used as measurement objects.
S304: and sending the physical cell identifier corresponding to each detected adjacent physical cell and the corresponding wireless measurement index to the IAB host so that the IAB host sends a physical cell identifier update configuration message, wherein the wireless measurement index comprises the signal strength of the corresponding physical cell.
It should be noted that the physical cell identifier is a basic factor for each physical cell to generate a synchronization signal, and the MT functional module obtains a corresponding physical cell identifier and a corresponding wireless measurement indicator, such as reference signal received power RSRP that represents signal strength of the physical cell, through detecting the synchronization signal. This allows determining which neighboring physical cells and how strong the signal strength corresponds to each physical cell.
In an embodiment, in the measurement report cell ReportConfigNR, an event reporting mode may be selected, and then the IAB host notifies the MT function module, and sends a report to the IAB host when the radio measurement index of another physical cell is found to be higher than that of the current physical cell, that is, only when the MT function module measures that the radio measurement index of the adjacent physical cell is higher than that of the physical cell corresponding to the current IAB node, the detected physical cell identifier corresponding to each adjacent physical cell and the corresponding radio measurement index are sent to the IAB host. Although the event report is beneficial to saving signaling overhead, in the application scenario of the present application, the present application needs to know what sibling cells have, what their respective signal strengths are, and the purpose is not handover, so that it is not beneficial to determine the sibling cells.
In another embodiment, in the measurement report cell ReportConfigNR, a periodic reporting mode may be selected, and step S304 may specifically be: and periodically sending the detected physical cell identifier corresponding to each adjacent physical cell and the corresponding wireless measurement index to the IAB host so that the IAB host sends a physical cell identifier update configuration message, thus selecting a periodic reporting mode to feed back the measurement result, wherein the feedback frequency is 1 or other limited times, and the MT functional module can truly report the measurement index of each cell to the IAB host, thereby better providing possible adjacent physical cells for the IAB host and being beneficial to eliminating the interference of the adjacent physical cells as much as possible.
S305: and receiving a physical cell identifier update configuration message, wherein the physical cell identifier update configuration message comprises a second physical cell identifier, and the second physical cell identifier is obtained by the IAB host through reallocation according to the physical cell identifier corresponding to each adjacent physical cell, the corresponding wireless measurement index and an adjacent physical cell identifier conflict prevention mechanism.
It should be noted that, after receiving the physical cell identifier and the corresponding wireless measurement index corresponding to each neighboring physical cell, the IAB host may allocate a second physical cell identifier to the mobile IAB node in combination with a collision prevention mechanism for the neighboring physical cell identifiers to avoid the physical cell identifier collision, and then send a physical cell identifier update configuration message to the mobile IAB node to change the first physical cell identifier to the second physical cell identifier. Network performance impact minimization is based on different physical layer signals: designing a Primary Synchronization Signal (PSS), a demodulation reference signal (DMRS) and a Sounding Reference Signal (SRS), and allocating a physical uplink control channel (PUSCH), a physical random access channel (PUCCH) and a time domain; according to the physical layer protocol of 5G NR, as the physical cell identifier is generated by the primary synchronization signal PSS, only 3 primary synchronization signals PSS in the IAB network can be recycled, namely 0, 1 and 2, if the three modulo results of the physical cell identifier are the same, the primary synchronization signals PSS are also the same, in order to prevent the primary synchronization signal PSS from being confused, further influencing the cell identification and channel estimation error of the terminal equipment, influencing the signal synchronization and user perception, the physical cell identifiers between the adjacent cells of the physical cell identifier are not equal in the three modulo results, namely the three remaining results are the same; in order to prevent the basic sequences of the physical uplink control channel PUCCH from being confused, the physical cell identifiers between adjacent cells cannot be modulo thirty equal, that is, the thirty-over results are the same, so the comprehensive rule is that the physical cell identifiers between adjacent cells cannot be modulo three equal.
Optionally, the specific process of the IAB host reallocating the physical cell identifier according to the physical cell identifier corresponding to each neighboring physical cell, the corresponding wireless measurement indicator, and the collision prevention mechanism for the neighboring physical cell identifier is as follows:
the IAB host sorts the physical cell identifications corresponding to all the adjacent physical cells from high to low according to corresponding wireless measurement indexes to obtain a first sequence; the IAB host traverses the first sequence from high to low, sequentially takes out the physical cell identifiers from the first sequence and obtains a first calculation result by carrying out three remainders on the physical cell identifiers, and deletes a physical cell identifier, which has the same second calculation result as the first calculation result and is obtained by carrying out three remainders on the physical cell identifiers, from the full set of the physical cell identifiers after each calculation is finished; if the physical cell identifier complete set is not empty after traversal is completed, the IAB host randomly selects one physical cell identifier from the remaining physical cell identifiers in the physical cell identifier complete set as a second physical cell identifier; if the physical cell identifier complete set is empty after the first deletion operation is finished in the traversal process, the IAB host randomly selects one physical cell identifier from the remaining physical cell identifiers in the physical cell identifier complete set before the first deletion operation as a second physical cell identifier, so that the physical layer signal generated according to the current physical cell identifier is ensured to be not interfered with the nearest cell signal to the greatest extent, and the purpose of optimizing the system performance is achieved.
S306: changing a first physical cell identifier corresponding to the DU function module into a second physical cell identifier according to the physical cell identifier update configuration message;
it should be noted that the IAB host sends a physical cell identity update configuration message to the mobile IAB node to enable the mobile IAB node to update the physical cell identity corresponding to the DU function module, that is, change the first physical cell identity into the second physical cell identity, so as to avoid collision with the adjacent physical cell identities.
S307: and after the first physical cell identification is changed into the second physical cell identification, sending a response message to the IAB host.
It should be noted that, after the IAB node changes the first physical cell identity to the second physical cell identity, a response message needs to be sent to the IAB host to notify the IAB host that the physical cell identity has been updated. This may confirm that the IAB node has completed the adjustment of the physical cell identity.
In the embodiment of the application, after the IAB host recognizes an event of an IAB network topology structure change, in order to avoid a conflict between a current first physical cell identifier of a DU function module of the mobile IAB node and an adjacent physical cell identifier, the mobile IAB node configures the MT function module by receiving wireless measurement configuration information sent by the IAB host; detecting synchronous signals of a plurality of adjacent physical cells on wireless resources corresponding to the DU function module through the configured MT function module; sending the physical cell identifier corresponding to each detected adjacent physical cell and the corresponding wireless measurement index to an IAB host, and obtaining a second physical cell identifier which is redistributed by the IAB host in combination with an adjacent physical cell identifier collision prevention mechanism; and changing the first physical cell identifier corresponding to the DU function module into a second physical cell identifier, so that the conflict between the physical cell identifier corresponding to the mobile IAB node and the adjacent physical cell identifier is reduced, and the signal interference of the adjacent physical cell is greatly reduced.
The embodiment of the present application provides another method for configuring a physical cell identifier, which, based on the foregoing embodiment, further includes step S308: and stopping the signal receiving and sending of the DU function module, wherein the step S308 and the step S303 are executed simultaneously.
It should be noted that, because the MT function module occupies the wireless resource on the DU function module when performing wireless measurement, if the DU function module continues to receive and transmit signals on the wireless resource, it may interfere with the wireless measurement of the MT function module, which may result in inaccurate measurement results, and therefore, when the MT function module performs wireless measurement, it is necessary to stop receiving and transmitting signals of the DU function module, which may avoid interference to the wireless measurement of the MT function module, and improve the accuracy of detecting synchronization signals of multiple adjacent physical cells.
The embodiment of the present application provides another method for configuring a physical cell identifier, which, based on the foregoing embodiment, further includes step S309: and setting a measurement gap for the MT function module, wherein the time length of the measurement gap is greater than or equal to the time length of the switching of the working state of the MT function module, and step S308 follows step S303.
It should be noted that when the MT function module performs wireless measurement, data transmission cannot be performed simultaneously, which requires the IAB network to notify the MT function module, and does not need to manage data transmission during a certain period of time, and the IAB network does not schedule downlink or uplink transmission during the period of time. Conventionally, the MT function is measured for an upstream physical cell, and the upstream and downstream radio resources are typically separated by time division multiplexing. In this special scenario, since the MT function module performs measurement on the downstream radio resource and does not affect the upstream resource, the measurement interval does not need to be set particularly from the resource perspective. However, from the perspective of the device, the MT functional module needs to convert to its original operating state after performing the measurement of the downstream resource, and resume the communication with the upstream, if: the downstream resource measurement end time point + the MT function module operating state transition time > the upstream resource time start point may affect communication in the upstream direction. Whether to set the measurement gap and the length of the measurement gap are determined according to the specific downstream resource measurement end time point and the upstream resource time start point. For example, if the downstream resource measurement end time point + the MT function module operating state transition time is before the upstream resource time start point, the MT function module may resume communication with the upstream normally, and the set measurement gap may be zero; for another example, if the downstream resource measurement end time point + the MT function module operating state transition time is after the upstream resource time start point, there is no way to resume communication with the upstream direction before the upstream resource time starts, and therefore, a measurement gap needs to be set so that the measurement gap is greater than or equal to the MT function module operating state transition time, and thus, for setting a certain measurement gap as a protection time, interference of wireless measurement of the MT function module on the MT function module and the upstream communication state can be reduced.
Fig. 4 is a flowchart of reassigning a physical cell identifier by an IAB host according to an embodiment of the present application. A specific implementation manner is provided on the basis of step S305 in the foregoing embodiment, as shown in fig. 4, in this implementation manner, 3 sets of physical cell identifiers, that is, a neighboring physical cell identifier set a, a physical cell identifier set B to be screened, and a physical cell identifier set C to be selected, are set up, and the specific steps are as follows:
s401: on the basis of the set B, all physical cell identifications contained in the set A are excluded, and meanwhile, the physical cell identifications of the set A are sorted from high to low according to wireless measurement indexes, namely sorted from strong to weak according to the signal intensity of the physical cells, wherein the set B is a full set of all the physical cell identifications, namely 0 to 1007.
S402: set C records set B before each screening.
S403: it is determined whether set a is empty. If the set A is empty, jumping to step S406; if the set A is not empty, step S404 is continued.
S404: and sequentially taking out the physical cell identifiers from the set A according to the sequence of the signal intensity from strong to weak, performing triple-redundancy operation, and deleting the physical cell identifiers in the set B which have the same triple-redundancy result according to the operation result.
S405: and judging whether the set B is empty or not. If the set B is not empty, jumping to step S402; if the set B is empty, step S406 continues.
S406: and judging whether the current physical cell identifier is not set or whether the physical cell identifier is not in the set C. If the judgment result is negative, the flow is directly ended; if the judgment result is yes, the process proceeds to step S407.
S407: an item in the set C is selected as the current physical cell identity.
Therefore, the physical layer signal generated according to the current physical cell identification can be ensured to be free from generating interference with the nearest cell signal to the maximum extent, and the aim of optimizing the IAB network communication is fulfilled.
Fig. 5 provides a communication system 500 according to an embodiment of the present application, as shown in fig. 5, including an IAB host 510 and a mobile IAB node 520.
An IAB host 510, configured to send wireless measurement configuration information to a mobile IAB node 520 corresponding to an event after identifying the event of the change of the IAB network topology structure, where the mobile IAB node 520 currently corresponds to a first physical cell identifier; it should be noted that the event of the change of the topology structure of the IAB network includes that the new mobile IAB node 520 is started and then accesses the IAB network, or the original mobile IAB node 520 is switched to a physical cell corresponding to the new IAB parent node.
A mobile IAB node 520, configured to receive radio measurement configuration information sent by the IAB host 510; configuring the MT functional module according to the wireless measurement configuration information; detecting synchronous signals of a plurality of adjacent physical cells on wireless resources corresponding to the DU function module through the configured MT function module; sending the detected physical cell identifier corresponding to each adjacent physical cell and the corresponding wireless measurement index to the IAB host 510 to enable the IAB host 510 to send a physical cell identifier update configuration message, where the wireless measurement index includes the signal strength of the corresponding physical cell;
the IAB host 510 is further configured to, after re-allocating the mobile IAB node 520 to obtain a second physical cell identifier according to the physical cell identifier corresponding to each neighboring physical cell, the corresponding wireless measurement index, and the collision prevention mechanism for neighboring physical cell identifiers, send a physical cell identifier update configuration message to the mobile IAB node 520, where the physical cell identifier update configuration message includes the second physical cell identifier;
the mobile IAB node 520 is further configured to receive a physical cell identifier update configuration message sent by the IAB host 510; changing a first physical cell identifier corresponding to the DU function module into a second physical cell identifier according to the physical cell identifier update configuration message; after changing the first physical cell identity to the second physical cell identity, a response message is sent to the IAB host 510.
In this embodiment of the present application, after the IAB host 510 identifies an event of an IAB network topology change, in order to avoid a conflict between a current first physical cell identifier of the mobile IAB node 520 and an adjacent physical cell identifier, the mobile IAB node 520 configures the MT function module by receiving wireless measurement configuration information sent by the IAB host 510; detecting synchronous signals of a plurality of adjacent physical cells on wireless resources corresponding to the DU function module through the configured MT function module; sending the detected physical cell identifier corresponding to each adjacent physical cell and the corresponding wireless measurement index to the IAB host 510, and obtaining a second physical cell identifier that is redistributed by the IAB host 510 in combination with an adjacent physical cell identifier collision prevention mechanism; changing the first physical cell identifier corresponding to the DU function module into the second physical cell identifier reduces the collision between the physical cell identifier corresponding to the mobile IAB node 520 and the adjacent physical cell identifier, and greatly reduces the signal interference of the adjacent physical cell.
Fig. 6 is a schematic diagram of a data transmission process of a communication system according to an embodiment of the present application, and as shown in fig. 6, based on the communication system 500 provided in the foregoing embodiment, the specific process includes the following steps:
s601: the IAB host 510 sends wireless measurement configuration information to the mobile IAB node 520 corresponding to the event after recognizing the event of the change of the IAB network topology structure, wherein the Du function module of the mobile IAB node 520 currently corresponds to the first physical cell identifier;
s602: the mobile IAB node 520 receives the radio measurement configuration information sent by the IAB host 510; configuring the MT functional module according to the wireless measurement configuration information; detecting synchronous signals of a plurality of adjacent physical cells on wireless resources corresponding to the DU function module through the configured MT function module;
s603: the mobile IAB node 520 sends the detected physical cell identifier corresponding to each neighboring physical cell and the corresponding wireless measurement index to the IAB hosts 510, so that the IAB hosts 510 send a physical cell identifier update configuration message, where the wireless measurement index includes the signal strength of the corresponding physical cell;
s604: after the IAB host 510 reallocates the mobile IAB node 520 to obtain the second physical cell identifier according to the physical cell identifier corresponding to each neighboring physical cell, the corresponding wireless measurement indicator, and the collision prevention mechanism for neighboring physical cell identifiers,
s605: the IAB host 510 sends a physical cell identity update configuration message to the mobile IAB node 520, wherein the physical cell identity update configuration message comprises a second physical cell identity;
s606: the mobile IAB node 520 receives the physical cell identity update configuration message sent by the IAB host 510; changing a first physical cell identifier corresponding to the DU function module into a second physical cell identifier according to the physical cell identifier update configuration message;
s607: the mobile IAB node 520 sends a response message to the IAB host 510 after changing the first physical cell identity to the second physical cell identity.
Fig. 7 provides a mobile IAB node 700 according to an embodiment of the present application, as shown in fig. 7, including: a memory 720, a processor 710 and a program or instructions stored on the memory 720 and executable on the processor 710, which when executed by the processor 710, implement a physical cell identity configuration method according to any embodiment of the present application.
Fig. 8 is a communication apparatus 800 according to an embodiment of the present application, as shown in fig. 8, including:
a receiving module 810, configured to receive wireless measurement configuration information sent by an IAB host;
a configuration module 820, configured to configure the MT function module according to the wireless measurement configuration information;
a measurement module 830, configured to detect synchronization signals of multiple adjacent physical cells on a radio resource corresponding to the DU function module through the configured MT function module;
a sending module 840, configured to send the detected physical cell identifier corresponding to each neighboring physical cell and the corresponding wireless measurement indicator to the IAB host, so that the IAB host sends a physical cell identifier update configuration message, where the wireless measurement indicator includes signal strength of the corresponding physical cell;
a receiving module 810, further configured to receive a physical cell identifier update configuration message sent by the IAB host, where the physical cell identifier update configuration message includes a second physical cell identifier, and the second physical cell identifier is obtained by the IAB host through reallocation according to a physical cell identifier corresponding to each of the adjacent physical cells, a corresponding wireless measurement indicator, and an adjacent physical cell identifier collision prevention mechanism;
an updating module 850, configured to change the first physical cell identity corresponding to the DU function module to the second physical cell identity according to the physical cell identity update configuration message;
the sending module 840 is further configured to send a response message to the IAB host after the first physical cell identifier is changed to the second physical cell identifier.
The embodiments of the present application provide a readable storage medium, on which a program or an instruction is stored, where the program or the instruction is executed by a processor to implement the physical cell identity configuration method according to any one of the embodiments of the present application.
It should be noted that, the numbers of the steps in the present solution are only used for describing the overall design framework of the present solution, and do not represent the inevitable sequence relationship between the steps. On the basis that the overall implementation process accords with the overall design framework of the scheme, the method belongs to the protection range of the scheme, and the sequence in the description time font mode is not exclusive limitation on the specific implementation process of the scheme. The wireless communication system and the IAB mobile node are implemented based on the wireless communication method, and the descriptions in the respective embodiments of the wireless communication method, the wireless communication system and the IAB mobile node can be comprehensively implemented in the corresponding embodiment of another subject.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product.
Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. 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.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory. The memory may include forms of volatile memory in a computer readable medium, random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both permanent and non-permanent, removable and non-removable media, may implement the information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (12)
1. A method for configuring physical cell identity is applied to a mobile IAB node, a DU function module of the mobile IAB node currently corresponds to a first physical cell identity, and the method is characterized by comprising the following steps:
receiving wireless measurement configuration information sent by an IAB host;
configuring an MT functional module according to the wireless measurement configuration information;
detecting synchronous signals of a plurality of adjacent physical cells on wireless resources corresponding to the DU function module through the configured MT function module;
sending the detected physical cell identifier corresponding to each of the adjacent physical cells and the corresponding wireless measurement index to the IAB host so that the IAB host sends a physical cell identifier update configuration message, wherein the wireless measurement index includes the signal strength of the corresponding physical cell;
receiving the physical cell identifier update configuration message, wherein the physical cell identifier update configuration message includes a second physical cell identifier, and the second physical cell identifier is obtained by the IAB host through reallocation according to the physical cell identifier corresponding to each adjacent physical cell, the corresponding wireless measurement index and an adjacent physical cell identifier collision prevention mechanism;
changing the first physical cell identifier corresponding to the DU function module into the second physical cell identifier according to the physical cell identifier update configuration message;
and after the first physical cell identifier is changed into the second physical cell identifier, sending a response message to the IAB host.
2. The method according to claim 1, wherein when the configured MT function module detects synchronization signals of multiple adjacent physical cells on radio resources corresponding to DU function modules, the method further comprises: and stopping the signal receiving and sending of the DU function module.
3. The method of claim 1, wherein the radio measurement configuration information comprises radio resource attributes corresponding to synchronization signals of the plurality of neighboring physical cells, and wherein the radio resource attributes comprise frequency and time characteristics.
4. The method according to claim 1, wherein said configuring the MT function module according to the wireless measurement configuration information comprises:
the neighbor cell addition list parameters, neighbor cell modification list parameters, and SSB measurement timing configuration parameters are initialized to null.
5. The method of claim 1, wherein the sending the detected physical cell identifier corresponding to each of the neighboring physical cells and the corresponding radio measurement indicator to the IAB host so that the IAB host sends a physical cell identifier update configuration message comprises:
and periodically sending the detected physical cell identifier corresponding to each adjacent physical cell and the corresponding wireless measurement index to the IAB host so that the IAB host sends a physical cell identifier update configuration message.
6. The method according to claim 1, wherein after the configured MT function module detects synchronization signals of multiple adjacent physical cells on radio resources corresponding to DU function modules, the method further comprises:
and setting a measurement gap for the MT functional module, wherein the time length of the measurement gap is more than or equal to the time length of switching the working state of the MT functional module.
7. The method of claim 1, wherein the reassigning the IAB host according to the physical cell identifier corresponding to each of the neighboring physical cells, the corresponding radio measurement indicator, and a collision prevention mechanism for neighboring physical cell identifiers to obtain the second physical cell identifier comprises:
the IAB host sorts the physical cell identifications corresponding to all the adjacent physical cells from high to low according to the corresponding wireless measurement indexes to obtain a first sequence;
traversing the first sequence from high to low by the IAB host, sequentially taking out the physical cell identifiers from the first sequence, performing triple offset on the physical cell identifiers to obtain a first calculation result, and deleting a physical cell identifier, which is the same as the first calculation result, of a second calculation result obtained after triple offset from the full set of the physical cell identifiers after each calculation is finished;
if the physical cell identifier complete set is not empty after traversal is completed, the IAB host randomly selects one physical cell identifier from the remaining physical cell identifiers in the physical cell identifier complete set as the second physical cell identifier;
if the physical cell identifier complete set is empty after the first deletion operation is finished in the traversal process, the IAB host randomly selects one physical cell identifier from the remaining physical cell identifiers in the physical cell identifier complete set before the first deletion operation as the second physical cell identifier.
8. A communication system comprising an IAB host and a mobile IAB node;
the IAB host is used for sending wireless measurement configuration information to a mobile IAB node corresponding to an event after the event of the change of the topology structure of the IAB network is identified, wherein a DU function module of the mobile IAB node corresponds to a first physical cell identifier at present;
the mobile IAB node is used for receiving wireless measurement configuration information sent by an IAB host; configuring an MT functional module according to the wireless measurement configuration information; detecting synchronous signals of a plurality of adjacent physical cells on wireless resources corresponding to the DU function module through the configured MT function module; sending the detected physical cell identifier corresponding to each adjacent physical cell and a corresponding wireless measurement index to the IAB host so that the IAB host sends a physical cell identifier update configuration message, wherein the wireless measurement index comprises the signal strength of the corresponding physical cell;
the IAB host is further configured to, after a second physical cell identifier is obtained by reassigning the mobile IAB node according to the physical cell identifier corresponding to each of the neighboring physical cells, the corresponding wireless measurement index, and the neighboring physical cell identifier collision prevention mechanism, send a physical cell identifier update configuration message to the mobile IAB node, where the physical cell identifier update configuration message includes the second physical cell identifier;
the mobile IAB node is further used for receiving the physical cell identifier updating configuration message sent by the IAB host; changing the first physical cell identifier corresponding to the DU function module into the second physical cell identifier according to the physical cell identifier update configuration message; and after the first physical cell identifier is changed into the second physical cell identifier, sending a response message to the IAB host.
9. The system of claim 8, wherein the event of the IAB network topology change comprises a new mobile IAB node accessing the IAB network after starting, or an original mobile IAB node being handed over to a physical cell corresponding to a new IAB parent node.
10. A mobile IAB node, comprising: memory, processor and program or instructions stored on the memory and executable on the processor, which when executed by the processor implement the physical cell identity configuration method of any of claims 1 to 7.
11. A communications apparatus, comprising:
the receiving module is used for receiving wireless measurement configuration information sent by an IAB host;
the configuration module is used for configuring the MT function module according to the wireless measurement configuration information;
the measurement module is used for detecting the synchronous signals of a plurality of adjacent physical cells on the wireless resources corresponding to the DU function module through the configured MT function module;
a sending module, configured to send the detected physical cell identifier corresponding to each neighboring physical cell and a corresponding wireless measurement indicator to the IAB host, so that the IAB host sends a physical cell identifier update configuration message, where the wireless measurement indicator includes signal strength of the corresponding physical cell;
a receiving module, configured to receive a physical cell identifier update configuration message sent by the IAB host, where the physical cell identifier update configuration message includes a second physical cell identifier, and the second physical cell identifier is obtained by the IAB host through reallocation according to a physical cell identifier corresponding to each of the adjacent physical cells, a corresponding wireless measurement index, and an adjacent physical cell identifier collision prevention mechanism;
an updating module, configured to change a first physical cell identity corresponding to the DU function module to the second physical cell identity according to the physical cell identity update configuration message;
and the sending module is further configured to send a response message to the IAB host after the first physical cell identifier is changed to the second physical cell identifier.
12. A readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the physical cell identity configuration method according to any one of claims 1 to 7.
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