CN101222759B - Subdistrict re-selection method, system and terminal in mobile communications network - Google Patents
Subdistrict re-selection method, system and terminal in mobile communications network Download PDFInfo
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Abstract
The invention relates to the mobile communication field and discloses a cell reselection method, a system and a terminal in a mobile communication network for balancing load between cells. In the invention, according to the grades of terminal users with different sorts, different reselected parameter sets are selected for cell reselection in order that terminals with different sorts reselected to the same cell have different probabilities. When the reselected parameter sets are calculated, the factor of cell bandwidth can be added to increase the probability for the terminal to access the cell which matches bandwidth with the terminal bandwidth, thereby making the best of the bandwidth resource of the terminal and the cell. The reselected parameter sets are calculated only according to the load and the cell bandwidth of a servicing cell or the load and the cell bandwidth of the servicing cell and the adjacent cell. The reselected parameter sets can be calculated by the network side; the reselected parameter sets aiming at different terminal user grades are broadcast in the cell; the corresponding reselected parameter set is selected by the terminal according to the own user grade.
Description
Technical Field
The invention relates to the field of mobile communication, in particular to a cell reselection technology.
Background
In all cellular mobile communication technologies, handover and cell reselection are important components, and specifically, when a ue leaves one cell and enters another cell, the signal of the original cell received by the ue is necessarily weaker, and the signal of the entering cell received by the ue is stronger. In order to maintain the quality of the signal received by the terminal, it is necessary to switch the terminal from the original base station to the base station where the newly entered signal is stronger. For a connected terminal, the switching between the base stations is called handover, and for an idle terminal, the change of the terminal resident cell is completed through a cell reselection process, a target cell needs to be detected, and cell reselection is performed in a cell meeting the requirements.
In a mobile communication system, a terminal measures signal quality of different cells, compares the measured signal quality with a signal quantity threshold value in system information, and reselects the cell if the measured signal quality continuously reaches a reselection criterion within a certain time. In addition to triggering cell reselection when a terminal moves from one cell to another cell, sometimes the network side may also trigger cell reselection for load balancing purposes.
Specifically, when the terminal performs cell reselection, it is necessary to measure the signal levels or signal qualities of the own cell and neighboring cells, map the measured values to cell reselection evaluation values Rs and Rn, and determine a preferred cell by comparing the magnitudes of Rs and Rn. Here, Rs and Rn may be a set of values, and the mapping method is determined by the system and broadcasted to the terminal through a system message.
In order to avoid the situation of cell load imbalance, some cells have larger load (relatively smaller residual load) but reside more idle terminals, and other cells have smaller load (relatively larger residual load) but no idle terminals reside or reside less idle terminals. Under the condition of unbalanced cell load, in cells with smaller residual load but more resident terminals, when the resident terminals initiate services, the quality of the services may be reduced, and even the existing services are interrupted; and the cell with larger residual load amount causes resource waste because of less terminal number. In order to avoid the above situation, when the terminal performs cell reselection, the network side needs to perform macro control on the terminal; if the situation occurs, the terminal can be allowed to reselect the cell with larger residual load capacity through the cell.
The general process of the network side for the distribution control of the terminal in idle state between the adjacent cells is as follows: and the network side carries out load measurement on the cell, the load factors are considered in the cell reselection parameters according to the load measurement result, the cell reselection parameters are broadcast and issued to all terminals in the cell through system information, and the terminals carry out cell reselection according to the cell reselection parameters, so that the balanced distribution of the potential load is completed.
The specific way to consider the load factor in the cell reselection parameters is: the network side sets three parameters of 'upper threshold of load grade division' and 'lower threshold of load grade division' and 'delay of load grade division'. When the load of the system is higher than the upper threshold of the load grade division and the load grade division delay, the load grade of the system is considered to be high, and when the load of the system is lower than the lower threshold of the load grade division and the load grade division delay is subtracted, the load grade of the cell is considered to be light. The network side correspondingly adjusts the cell selection and reselection parameters issued in the system message according to the load level of the cell, including the load level offset Qoffset1 and Qoffset2, and the pilot frequency cell reselection start threshold Sintersearch, and issues the adjusted cell selection and reselection parameters to all terminals in the cell, thereby controlling the terminals to select the cell with relatively small load capacity in the cell selection and reselection process.
In the prior art, since the bandwidth capabilities supported by the network and the terminal are fixed, similar bandwidth factors do not need to be considered in the existing cell reselection process. However, with the continuous development of communication networks, the bandwidth capabilities of both the communication system and the terminal are expanded to different degrees, and the network needs to be compatible with the terminal with the existing bandwidth capability and the terminal with the expanded bandwidth capability at the same time, so that a situation that the same system supports terminals with multiple bandwidth capabilities at the same time may occur. After entering a connected state, terminals with different bandwidth capabilities may have different load degrees from a cell, and simply performing cell reselection according to a network load situation may also cause a situation of load imbalance among cells, and is not suitable for a future evolved network system.
Disclosure of Invention
The main technical problem to be solved by the embodiments of the present invention is to provide a method, a system and a terminal for reselecting a cell in a mobile communication network, so that the load between cells is more balanced.
In order to solve the above technical problem, an embodiment of the present invention provides a cell reselection method in a mobile communication network, including the following steps:
the terminal acquires a corresponding reselection parameter set according to the user level of the terminal;
and the terminal performs cell reselection according to the reselection parameter set.
The embodiment of the invention also provides a cell reselection system in a mobile communication network, and a terminal side comprises: a unit for obtaining a corresponding reselection parameter set according to the user level of the terminal; and a unit for performing cell reselection according to the reselection parameter set.
An embodiment of the present invention further provides a terminal, including:
a unit for obtaining a corresponding reselection parameter set according to the user level of the terminal; and
and a unit for cell reselection according to the reselection parameter set.
The embodiment of the invention also provides a cell reselection method in a mobile communication network, which comprises the following steps:
the terminal acquires a corresponding reselection parameter set according to the bandwidth capacity of the terminal;
and the terminal performs cell reselection according to the reselection parameter set.
The embodiment of the invention also provides a cell reselection system in a mobile communication network, and a terminal side comprises: a unit for obtaining a corresponding reselection parameter set according to the bandwidth capability of the terminal; and a unit for performing cell reselection according to the reselection parameter set.
An embodiment of the present invention further provides a terminal, including:
a unit for obtaining a corresponding reselection parameter set according to the bandwidth capability of the terminal; and
and a unit for cell reselection according to the reselection parameter set.
Compared with the prior art, the embodiments of the invention have the main differences and the effects that:
and selecting different reselection parameter sets according to the user grades of the different classes of terminals for cell reselection. The user level can be comprehensively established by user subscription information, terminal bandwidth and other capabilities, operator policy information and the like, or can be established by one of the user subscription information, the terminal bandwidth and other capabilities. For example, a terminal with a large bandwidth capability has the capability of initiating a service occupying a large load, and the expected value of the occupied load of the initiated service is statistically high. Different sets of reselection parameters essentially represent different reselection probabilities. When the bandwidth capability of at least one terminal is smaller than the bandwidth capability of a cell, if the influence of the bandwidth capability of the terminal is considered during reselection, the reselection probability of the terminal with larger bandwidth capability is improved when the cell load is smaller and the reselection probability of the terminal with larger bandwidth capability is reduced when the cell load is larger through the setting of a reselection parameter set, so that the future load among the cells is more balanced.
And calculating the factor of adding the cell bandwidth when the reselection parameter set is selected, and increasing the probability that the terminal reselects the cell matched with the bandwidth of the terminal, thereby fully utilizing the bandwidth resources of the terminal and the cell. For the terminal bandwidth capability smaller than the cell bandwidth capability, the relative proportions of the cell load, the terminal bandwidth capability and the cell bandwidth capability can be comprehensively considered, and different reselection parameter sets are generated for the terminals with different bandwidth capabilities, so that the future load among the cells is more balanced.
When calculating the reselection parameter set, the reselection parameter set may be calculated only according to the load and the cell bandwidth of the serving cell, or according to the load and the cell bandwidth of the serving cell and its neighboring cells. By referring to the relevant information of the adjacent cells, the calculation of the reselection parameter set can be more reasonable, and the requirement of load balancing among the cells can be better met.
The reselection parameter sets can be calculated at the network side, and the reselection parameter sets aiming at different user grades are broadcasted in the cell, and the terminal selects the corresponding reselection parameter sets according to the user grades. The load of the terminal is small in the mode, so that the electric energy of the terminal is saved.
Or the network side sends the load and bandwidth information of the cell, and the terminal calculates the reselection parameter set according to the user grade of the terminal. This way the burden on the network side is small.
The load information may be simply expressed in terms of load levels, rather than in a more specific form, which may both satisfy the requirements for cell reselection and effectively reduce the amount of information representing the load information.
The network side can also store reselection parameter sets corresponding to various load grades in the terminal according to the user grade of the terminal; or the network side broadcasts reselection parameter sets corresponding to various user grades and various load grades, and the terminal receives and stores the reselection parameter sets corresponding to the user grade of the terminal and stores the corresponding relation between the reselection parameter sets and various load grades. And selecting a reselection parameter set corresponding to the load grade from the stored reselection parameter sets by the terminal according to the load grade of the current cell. Therefore, the network side only needs to periodically broadcast the load level of the cell, and the resource of the network side broadcast channel is greatly saved.
Drawings
Fig. 1 is a flow chart of a cell reselection method in a mobile communication network according to a first embodiment of the present invention;
fig. 2 is a flow chart of a cell reselection method in a mobile communication network according to a second embodiment of the present invention;
fig. 3 is a flow chart of a cell reselection method in a mobile communication network according to a third embodiment of the present invention;
fig. 4 is a schematic view of load information of each cell of example 1 in a cell reselection method in a mobile communication network according to a third embodiment of the present invention;
fig. 5 is a schematic diagram of cell reselection of example 1 in a cell reselection method in a mobile communication network according to a third embodiment of the present invention;
fig. 6 is a schematic view of load information of each cell of example 2 in a cell reselection method in a mobile communication network according to a third embodiment of the present invention;
fig. 7 is a schematic diagram of cell reselection of example 2 in a cell reselection method in a mobile communication network according to a third embodiment of the present invention;
fig. 8 is a flow chart of a cell reselection method in a mobile communication network according to a fourth embodiment of the present invention;
fig. 9 is a flowchart of a cell reselection method in a mobile communication network according to a fifth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
In each embodiment of the present invention, terminals of different user classes perform cell reselection according to different reselection parameter sets. The user level may be comprehensively formulated by user subscription information, terminal capabilities (including terminal bandwidth capability, security capability, access capability, and the like), operator policy information, and the like, or may be formulated by one of them. Different sets of reselection parameters essentially represent different reselection probabilities.
Taking the example that only the terminal bandwidth capability is considered in the user class, since the terminal with the larger bandwidth capability has the capability of initiating the service occupying larger load, the expectation value of the service occupying load initiated by the terminal is higher. In order to avoid that a terminal with a larger bandwidth capability resides in the same cell, initiates a service in the same cell, and applies an excessive load to the cell, the influence of the terminal bandwidth capability on the future load of the cell needs to be considered when the terminal performs cell reselection.
A first embodiment of the present invention relates to a cell reselection method in a mobile communication network. In this embodiment, the bandwidth capabilities of different cells may be different, and the bandwidth capabilities of terminals in the network may also be different. The user grade in this embodiment is represented by the terminal bandwidth capability, and the network side provides different reselection parameter sets according to different terminal bandwidth capabilities for the terminal with corresponding bandwidth capabilities to use when performing cell reselection. As shown in fig. 1.
In step 110, the network side (generally, the base station to which the serving cell belongs) generates reselection parameter sets respectively corresponding to the bandwidth capabilities of the terminals only according to the load information of the serving cell and different terminal bandwidth capabilities, where the generated reselection parameter sets include reselection bias parameters. The load information of the serving cell mainly includes a load level, a load hysteresis parameter, and the like, and the network side can determine the load level of the serving cell according to parameters such as the transmission power of the cell, the average throughput of users, the throughput of a system, and/or the maximum number of access users. The specific load classes of the network side can be set by the operator according to the situation.
For example, according to the difference of bandwidth capabilities, the current terminals are mainly classified into terminals having a bandwidth of 20MHz and terminals having a bandwidth greater than 20 MHz. When a reselection parameter set is generated for a terminal in a cell A, a network side determines the load level of the cell A according to the transmitting power, the average throughput of users, the system throughput and the maximum number of access users of the cell A. And according to the determined load level, generating corresponding reselection parameter sets for the terminal with the bandwidth of 20MHz and the terminal with the bandwidth greater than 20MHz respectively, wherein the parameters in the reselection parameter sets can comprise offset parameters Qoffset1, Qoffset2 and/or Sintercell and the like. Different reselection parameter sets substantially represent different reselection probabilities, and different reselection parameter sets are set for terminals with different bandwidth capabilities, so that the reselection probability of the terminal with larger bandwidth capability is improved when the cell load is smaller, and the reselection probability of the terminal with larger bandwidth capability is reduced when the cell load is larger, and further the future load among the cells is more balanced.
Then, step 120 is entered, and the network side device, such as the base station to which the cell a belongs, broadcasts the reselection parameter sets corresponding to different terminal bandwidth capabilities in a system message.
And then, step 130 is entered, when the terminal in the cell a needs to perform cell reselection, a corresponding reselection parameter set is selected according to the bandwidth capability of the terminal, and the cell reselection is performed according to the selected reselection parameter set. Specifically, the existing cell reselection technology may be referred to as a cell reselection mode according to the reselection parameter set. Due to the limitation of the reselection parameter set, if the bandwidth capability of the terminal is large, that is, a service occupying a large load is likely to be initiated, when a cell is reselected, only a cell with a small cell load is likely to be selected, even if the terminal initiates a service occupying a large load in the future, the cell cannot bear the load, and the communication quality of the cell cannot be influenced; if the bandwidth capability of the terminal is small, that is, only a service occupying a small load may be initiated, when a cell is reselected, it is not necessary to select only a cell with a small cell load, but also a cell with a slightly large cell load may be selected, so that even if the terminal initiates a service in the future, the load of the cell is not greatly affected. Therefore, the future load among the cells is more balanced, and the possibility that a large number of idle terminals reside in the cell with larger current residual load is reduced.
In addition, in this embodiment, if a large number of idle terminals reside in a cell with a large current remaining load and initiate services respectively, which may affect access quality, a random access channel access resource is added to the cell, thereby avoiding degradation of existing service quality and even service interruption.
It should be noted that, in this embodiment, the terminal bandwidth capability mainly represents the user class, and the network side generates different reselection parameter sets according to different terminal bandwidth capabilities for use by the terminal with corresponding bandwidth capability in cell reselection. In practical application, the user level may also be determined by one or any combination of subscription information of the user, bandwidth capability of the terminal, and policy information of the operator, the network side gives different reselection parameter sets according to the comprehensively determined user capability, and the terminal selects a corresponding reselection parameter set according to the user level to perform cell reselection.
A second embodiment of the present invention also relates to a cell reselection method in a mobile communication network, which is different from the first embodiment in that, in the first embodiment, a network side generates a plurality of corresponding reselection parameter sets according to a user class (determined by one of cell load information, different terminal bandwidth capabilities, and user subscription information, or any combination thereof, which is determined by an operator policy), and a terminal directly selects from each generated reselection parameter set according to its own user class; in this embodiment, the network side broadcasts the bandwidth and load information of the serving cell in the serving cell, and the terminal that needs cell reselection calculates a reselection parameter set according to the broadcasted bandwidth and load information and by combining the user level of the terminal. The former method has less burden on the terminal, and can save the electric energy of the terminal; the latter method has less burden on the network side.
The following description specifically describes the terminal bandwidth capability as representing the user class. As shown in fig. 2, in step 210, the base station to which the serving cell belongs broadcasts the bandwidth and load information of the serving cell in the serving cell. In order to reduce the update frequency of the load information, the load information is also represented by a load level. The base station may determine the load level of the serving cell according to parameters such as the transmit power of the cell, the average throughput of users, the system throughput, and/or the maximum number of access users. The specific definition and division of the load classes can be flexibly defined by the operator.
Then, step 220 is entered, and the idle terminal that needs to perform cell reselection calculates a suitable reselection parameter set according to the serving cell bandwidth and the load information (which may include load level, remaining load, and the like) in the broadcast information, and by combining the bandwidth capability of the terminal itself. Because the reselection parameter set is calculated by the terminal, the burden of the network side is reduced. And because the factor of adding the cell bandwidth when calculating the reselection parameter set, the probability that the terminal reselects the cell matched with the bandwidth of the terminal is increased, thereby fully utilizing the bandwidth resources of the terminal and the cell.
Then, in step 230, the terminal performs cell reselection according to the reselection parameter set.
Similarly, in this embodiment, if a large number of idle terminals reside in a cell with a large current remaining load and initiate services respectively, which may affect the access quality, a random access channel access resource is added to the cell, thereby avoiding the degradation of the existing service quality and even service interruption.
It should be noted that, in this embodiment, the terminal bandwidth capability is used to represent the user class, and the terminal directly calculates the corresponding reselection parameter according to the bandwidth capability and the broadcasted cell bandwidth and load information. In practical application, the user level may also be determined comprehensively by one or any combination of the user subscription information, the terminal bandwidth capability, and the operator policy information, the terminal calculates a corresponding reselection parameter according to the comprehensively determined user level in combination with the broadcasted cell bandwidth and load information, and performs cell reselection according to the reselection parameter.
A third embodiment of the present invention also relates to a cell reselection method in a mobile communication network, which is substantially the same as the second embodiment, except that in the second embodiment, the network side only broadcasts the bandwidth and load information of the serving cell in the serving cell; in the present embodiment, the network side broadcasts the bandwidth and the load information of the serving cell and its neighboring cells together in the serving cell. Similarly, in the present embodiment, the user capability is expressed by the terminal bandwidth capability.
As shown in fig. 3, in step 310, the base station to which the serving cell belongs obtains bandwidth and load information of the serving cell and its neighboring cells. For adjacent cells belonging to the same base station, the base station can obtain bandwidth and load information of the adjacent cells by measuring signals of the adjacent cells; for the adjacent cells belonging to different base stations, the base station may obtain bandwidth and load information of the adjacent cells through information interaction with the adjacent base stations (e.g., through an X2 interface between evolved base stations or inter-cell radio resource management). The load information mainly comprises load grade, load delay parameters and the like, and the base station can determine the load grade of a service cell and an adjacent cell according to parameters such as the transmitting power of the cell, the average throughput of users, the throughput of a system and/or the maximum number of access users. The specific definition and division of the load classes can be flexibly defined by the operator.
Then, in step 320, the base station broadcasts the bandwidth and load information of the serving cell and its neighboring cells together in the serving cell.
Then, step 330 is performed, and the idle terminal that needs to perform cell reselection calculates a suitable reselection parameter set according to the load information (including load level, residual load, etc.) and bandwidth capability of the serving cell and the neighboring cell in the broadcast information and by combining the bandwidth capability of the terminal itself. Because the reselection parameter set is calculated by the terminal, the burden of the network side is reduced. And because the load and the cell bandwidth of the serving cell and the adjacent cell are also referred when the reselection parameter set is calculated, the calculation of the reselection parameter set can be more reasonable by referring to the relevant information of the adjacent cell, and the requirement of load balance among the cells can be better met.
Then, in step 340, the terminal performs cell reselection according to the reselection parameter set.
For example, the UE1 with the existing bandwidth capability of 20MHz resides in a cell a of the enb 1, the bandwidth capability of the cell a is 20MHz, its neighboring cells include a cell B and a cell C belonging to another enb 2, the bandwidth capability of the neighboring cell B is 10MHz, the bandwidth capability of the neighboring cell C is 5MHz, and the load information of each cell is shown in fig. 4. The serving cell a obtains load information, cell bandwidth (cell B bandwidth is 10MHz, cell C bandwidth is 5MHz) and the like of the neighboring cell B and the cell C through an X2 interface between the enb 1 and the enb 2, and determines respective load levels according to the load information of the serving cell and the neighboring cell, for example, the load levels are divided into a load level 1 to a load level 10 (corresponding to a ratio of 0.1-1) according to a ratio of cell remaining load to cell bandwidth capability, it can be considered that the cell is overloaded when the load level is less than 3, and specific load level setting and use can be flexibly set by an operator. The bandwidth and load information (which may include load level, remaining load, etc.) of the serving cell and neighboring cells is broadcast in the serving cell. The UE1 calculates a suitable reselection parameter set according to the load information (including load level, remaining load, etc.) and bandwidth capability of the cell A, B, C in the broadcast information, in combination with the bandwidth capability of the terminal itself, performs cell reselection according to the reselection parameter set, and when the signal strengths of the cell B and the cell C both meet the reselection criterion, comprehensively determines the bandwidth capabilities of the cell B and the cell C and the remaining loads of the cell B and the cell C, and preferentially considers the cell with the bandwidth capability less than or equal to the bandwidth capability of the UE1 and the cell with the large remaining load. Since the bandwidth capabilities of cell B and cell C are both less than the bandwidth capability of UE1, the remaining loads of both continue to be determined, and since the remaining load of cell B is greater than cell C, UE1 reselects to cell B, as shown in fig. 5.
For another example, the UE1 with the bandwidth capability of 20MHz resides in a cell C under the domain of the enb 1, the bandwidth capability of the cell C is 5MHz, its neighboring cells have a cell a and a cell B belonging to another enb 2, the bandwidth capability of the neighboring cell a is 25MHz, the bandwidth capability of the neighboring cell B is 15MHz, and the load information of each cell is shown in fig. 6. The serving cell C obtains load information, cell bandwidth (cell a bandwidth is 25MHz, cell B bandwidth is 15MHz), and the like of the adjacent cell a and cell B through an X2 interface between the evolved base station 1 and the evolved base station 2; and determining respective load levels according to the load information of the serving cell and the neighboring cells, and broadcasting the bandwidths and load information (which may include the load levels, the remaining loads, etc.) of the serving cell and the neighboring cells in the serving cell. The UE1 calculates a suitable reselection parameter set according to the load information (including load level, remaining load, etc.) and bandwidth capability of the cell A, B, C in the broadcast information, and in combination with the bandwidth capability of the terminal itself, performs cell reselection. When the signal strength of the cell A and the cell B both meet the reselection criterion, the bandwidth capabilities of the cell A and the cell B and the residual load of the cell A and the cell B are comprehensively judged, and the cell with the bandwidth capability less than or equal to that of the UE1 and the cell with the large residual load are considered preferentially. Because the bandwidth capability of the cell a is greater than that of the UE1, the bandwidth capability of the cell B is equal to that of the UE1, the residual load of the cell a is 3, and the residual load of the cell B is 2.5, the cell B is reselected in comprehensive consideration. As shown in fig. 7.
In addition, in this embodiment, if a large number of idle terminals reside in a cell with a large current remaining load and initiate services respectively, which may affect access quality, a random access channel access resource is added to the cell, thereby avoiding degradation of existing service quality and even service interruption.
Similarly, in this embodiment, the terminal bandwidth capability is used to represent the user class, and the terminal calculates the corresponding reselection parameter according to the bandwidth capability of the terminal, in combination with the broadcasted bandwidth and load information of the local cell and the neighboring cells. In practical application, the user level may also be determined comprehensively by one or any combination of the user subscription information, the terminal bandwidth capability, and the operator policy information, and the terminal calculates a corresponding reselection parameter according to the comprehensively determined user level in combination with the broadcasted bandwidth and load information of the local cell and the neighboring cell, and performs cell reselection according to the reselection parameter.
A fourth embodiment of the present invention also relates to a cell reselection method in a mobile communication network, which is substantially the same as the first embodiment, and is different therefrom in that in the first embodiment, a network side generates a plurality of corresponding reselection parameter sets only according to load information of a serving cell and different terminal bandwidth capabilities; in this embodiment, in addition to the load information of the serving cell and different terminal bandwidth capabilities, the network side also generates a reselection parameter set corresponding to the terminal bandwidth capability according to the load information of the neighboring cell.
As shown in fig. 8, in step 810, the base station to which the serving cell belongs obtains bandwidth and load information of the serving cell and its neighboring cells. For adjacent cells belonging to the same base station, the base station can obtain bandwidth and load information of the adjacent cells by measuring signals of the adjacent cells; for the adjacent cells belonging to different base stations, the base station can obtain the bandwidth and load information of the adjacent cells through information interaction with the adjacent base stations. The load information includes load grade, load delay parameter, etc., and the base station may determine the load grade of the cell according to parameters such as transmission power of the cell, user average throughput, system throughput, and/or the maximum number of access users. The specific division of the cells into several load classes can be set by the operator according to the actual situation.
Then, step 820 is entered, the base station generates reselection parameter sets respectively corresponding to the bandwidth capabilities of the terminals according to the load information of the serving cell and the neighboring cells thereof and different terminal bandwidth capabilities, the types and numbers of parameters included in the reselection parameter sets corresponding to the different terminal bandwidth capabilities may be different, the reselection parameter sets may include reselection offset parameters Qoffset1, Qoffset2 and/or Sintercell, etc., or may directly include the load information of the serving cell and the neighboring cells, the cell bandwidth capabilities, etc., or may include bias parameters such as Qoffset1, Qoffset2 and/or Sintercell, as well as the load information, the cell bandwidth capabilities, etc. Each reselection parameter set corresponds to a terminal bandwidth capability. For example, the reselection parameter set corresponding to the 20MHz terminal bandwidth capability includes reselection bias parameters, and the reselection parameter set corresponding to the terminal bandwidth capability greater than 20MHz includes load information of the serving cell and the neighboring cell, cell bandwidth capability, and the like. When the reselection parameter set is calculated, the calculation of the reselection parameter set is more reasonable according to the load and the cell bandwidth of the serving cell, the load and the cell bandwidth of the serving cell and the adjacent cell, and the load balance requirement among the cells is better met.
Then, step 830 is entered, and the base station issues reselection parameter sets corresponding to different terminal bandwidth capabilities through system broadcast information.
And then step 840, when the terminal in the serving cell needs to perform cell reselection, selecting a corresponding reselection parameter set according to the bandwidth capability of the terminal, and performing cell reselection according to the selected reselection parameter set. Specifically, the existing cell reselection technology may be referred to as a cell reselection mode according to the reselection parameter set.
Similarly, in this embodiment, if a large number of idle terminals reside in a cell with a large current remaining load and initiate services respectively, which may affect the access quality, a random access channel access resource is added to the cell, thereby avoiding the degradation of the existing service quality and even service interruption.
It should be noted that, in this embodiment, the terminal bandwidth capability mainly represents the user class, and the network side generates various reselection parameter sets according to the load information of the local cell and the neighboring cell and different terminal bandwidth capabilities, so as to be used by the terminal with the corresponding bandwidth capability when performing cell reselection. In practical application, the user level may also be determined by one of or any combination of the subscription information of the user, the bandwidth capability of the terminal, and the policy information of the operator, the network side gives different reselection parameter sets according to the combined information and the load information of the local cell and the neighboring cell, and the terminal selects the corresponding reselection parameter set according to the user level to perform cell reselection.
The fifth embodiment of the present invention also relates to a cell reselection method in a mobile communication network. In the present embodiment, the network side presets reselection parameter sets corresponding to various load information in the terminal according to the user class (expressed by bandwidth capability) of the terminal, and the network side broadcasts only the current load information and the terminal selects a reselection parameter set corresponding to the load information from the preset reselection parameter sets. Therefore, the network side only needs to periodically broadcast the load level of the cell, and the resource of the network side broadcast channel is greatly saved.
Specifically, as shown in fig. 9, in step 910, the network side evaluates the load condition of the cell according to parameters such as the average throughput of users, the transmission power, the maximum number of users accessing the cell, and determines load level parameters, such as a load level parameter value, a load hysteresis parameter value, and the like. For each load level, the network side defines a reselection parameter set corresponding to different terminal bandwidth capabilities, which may include offset parameters Qoffset1, Qoffset2, and/or Sintercell, etc.
In step 920, the network side presets the reselection parameter sets of all load levels corresponding to the bandwidth capability in the terminal according to the bandwidth capability of the terminal. The network side can know the bandwidth capability of the terminal through interaction with the terminal, and then select reselection parameter sets of all load grades corresponding to the bandwidth capability of the terminal to be sent to the terminal, and the terminal stores the reselection parameter sets and the corresponding relation between the reselection parameter sets and the load grades. The mode of issuing the reselection parameter set may be broadcast, such as paging message, or may use a dedicated channel.
In step 930, the network side periodically broadcasts current load information.
In step 940, when the terminal needs to perform cell reselection, a reselection parameter set corresponding to the currently broadcasted load information is selected from preset reselection parameter sets.
In step 950, the terminal performs cell reselection according to the selected reselection parameter set.
In this embodiment, all cases where the load level is less than a certain level may be regarded as a small load, and in this case, the terminal may not consider adjustment of the load for cell reselection.
Similarly, in this embodiment, if a large number of idle terminals reside in a cell with a large current remaining load and initiate services respectively, which may affect the access quality, a random access channel access resource is added to the cell, thereby avoiding the degradation of the existing service quality and even service interruption.
In the present embodiment, the terminal bandwidth capability mainly represents the user class, and the network side presets the reselection parameter set corresponding to various load information in the terminal corresponding to the bandwidth capability according to the terminal bandwidth capability. In practical application, the user class may also be determined comprehensively by one of or any combination of subscription information of the user, bandwidth capability of the terminal, and policy information of the operator, the network side may determine a reselection parameter set according to the comprehensively determined user class, preset the reselection parameter set corresponding to various load information in the terminal having the corresponding user class, and the terminal selects the corresponding reselection parameter set according to the current load information.
A sixth embodiment of the present invention also relates to a method for reselecting a cell in a mobile communication network, which is different from the fifth embodiment in that in the present embodiment, a network side broadcasts reselection parameter sets corresponding to various user classes and various load information; the terminal receives and stores various reselection parameter sets of various load information corresponding to the user grade of the terminal, and stores the corresponding relations between the reselection parameter sets and the various load information. The network side broadcasts the current load information in a smaller period, and the terminal selects the reselection parameter set corresponding to the load information from the stored reselection parameter sets. The network side can broadcast the reselection parameter sets corresponding to the user grades and the load information at a longer period or when the reselection parameter sets change, so that the reselection parameter sets stored by the terminal can be updated in time, and the accuracy of the cell reselection of the terminal is ensured. And because the period of the network side broadcast reselection parameter set is very long, the effect of saving the network side broadcast channel resources can be achieved.
A seventh embodiment of the present invention relates to a cell reselection system in a mobile communication network, the terminal side including: a unit for obtaining a corresponding reselection parameter set according to the user level of the terminal; and a unit for performing cell reselection according to the reselection parameter set. The network side comprises: a generating unit for generating at least two reselection parameter sets according to the cell load information and different user grades; means for broadcasting the sets of reselection parameters in the cell; the unit for acquiring the reselection parameter set at the terminal side selects one reselection parameter set from each reselection parameter set broadcasted by the network side according to the user level of the terminal side. Different reselection parameter sets substantially represent different reselection probabilities, and different reselection parameter sets are set for terminals of different user grades, so that the reselection probability of the terminal with a higher user grade is improved when the cell load is smaller, and the reselection probability of the terminal with the higher user grade is reduced when the cell load is larger, and further the future load among the cells is more balanced. The reselection parameter set contains reselection bias parameters, and the load information can be simply represented by load grades, but not in a more specific form, so that the requirement of cell reselection can be met, and the information quantity representing the load information can be effectively reduced. The generating unit may generate at least two reselection parameter sets only according to the load information of the serving cell and different user classes; or generating at least two reselection parameter sets according to the load information of the serving cell and the adjacent cells thereof and different user grades. By referring to the relevant information of the adjacent cells, the calculation of the reselection parameter set can be more reasonable, and the requirement of load balancing among the cells can be better met. The user level is determined by one of or any combination of user subscription information, terminal bandwidth capacity and operator strategy information.
The network side may further include: a unit for acquiring the bandwidth and load information of the adjacent cell not belonging to the base station through information interaction with the adjacent base station; or a unit for obtaining bandwidth and load information of a neighboring cell not belonging to the base station by measuring signals of the neighboring cells.
The network side may further include: a broadcasting unit for broadcasting the cell bandwidth and load information in the serving cell; and the unit for acquiring the reselection parameter set at the terminal side calculates the reselection parameter set according to the bandwidth and load information broadcasted by the network side and the user level of the terminal. The broadcasting unit broadcasts only the bandwidth and load information of the serving cell in the serving cell; or, the bandwidth and the load information of the serving cell and the neighboring cells thereof are broadcasted together in the serving cell. By sending the load and bandwidth information of the cell by the network side, the terminal calculates the reselection parameter set according to the user grade of the terminal, so that the load of the network side is relatively reduced.
The network side may further include: according to the user grade of the terminal, sending the reselection parameter sets corresponding to various load grades to a unit of the terminal; and a unit for broadcasting the current load level; the terminal side also comprises a unit for receiving and storing reselection parameter sets corresponding to various load grades and sent by the network side; the unit for acquiring the reselection parameter set at the terminal side selects the reselection parameter set corresponding to the load level from the stored reselection parameter sets.
Alternatively, the network side may further include: a unit for broadcasting reselection parameter sets corresponding to various user grades and various load grades, and a unit for broadcasting the current load grade; the terminal side correspondingly comprises a unit for receiving and storing each reselection parameter set corresponding to the user grade of the terminal side, and the unit also stores the corresponding relation between the reselection parameter sets and various load grades; the unit for acquiring the reselection parameter set at the terminal side selects the reselection parameter set corresponding to the load level from the stored reselection parameter sets. The network side only needs to broadcast the load grade of the cell periodically, so that the resource of the network side broadcast channel is greatly saved.
The network side may further include: and when a large number of idle terminals reside in a cell with large current residual load capacity to influence access quality, increasing a unit of random access channel access resources for the cell.
The mobile communication network in the embodiments of the present invention may be any network capable of simultaneously supporting terminals of different user classes and cells of different user classes, such as a long term evolution network.
In summary, in the embodiments of the present invention, different reselection parameter sets are selected according to the user classes of different types of terminals for cell reselection. The user level can be comprehensively established by user subscription information, terminal bandwidth and other capabilities, operator policy information and the like, or can be established by one of the user subscription information, the terminal bandwidth and other capabilities. For example, a terminal with a large bandwidth capability has the capability of initiating a service occupying a large load, and the expected value of the occupied load of the initiated service is statistically high. Different sets of reselection parameters essentially represent different reselection probabilities. When the bandwidth capability of at least one terminal is smaller than the bandwidth capability of a cell, if the influence of the bandwidth capability of the terminal is considered during reselection, the reselection probability of the terminal with larger bandwidth capability is improved when the cell load is smaller and the reselection probability of the terminal with larger bandwidth capability is reduced when the cell load is larger through the setting of a reselection parameter set, so that the future load among the cells is more balanced.
And calculating the factor of adding the cell bandwidth when the reselection parameter set is selected, and increasing the probability that the terminal reselects the cell matched with the bandwidth of the terminal, thereby fully utilizing the bandwidth resources of the terminal and the cell. For the terminal bandwidth capability smaller than the cell bandwidth capability, the relative proportions of the cell load, the terminal bandwidth capability and the cell bandwidth capability can be comprehensively considered, and different reselection parameter sets are generated for the terminals with different bandwidth capabilities, so that the future load among the cells is more balanced.
When calculating the reselection parameter set, the reselection parameter set may be calculated only according to the load and the cell bandwidth of the serving cell, or according to the load and the cell bandwidth of the serving cell and its neighboring cells. By referring to the relevant information of the adjacent cells, the calculation of the reselection parameter set can be more reasonable, and the requirement of load balancing among the cells can be better met.
The reselection parameter sets can be calculated at the network side, and the reselection parameter sets aiming at different user grades are broadcasted in the cell, and the terminal selects the corresponding reselection parameter sets according to the user grades. The load of the terminal is small in the mode, so that the electric energy of the terminal is saved.
Or the network side sends the load and bandwidth information of the cell, and the terminal calculates the reselection parameter set according to the user grade of the terminal. This way the burden on the network side is small.
The load information may be simply expressed in terms of load levels, rather than in a more specific form, which may both satisfy the requirements for cell reselection and effectively reduce the amount of information representing the load information.
The network side can also store reselection parameter sets corresponding to various load grades in the terminal according to the user grade of the terminal; or the network side broadcasts reselection parameter sets corresponding to various user grades and various load grades, and the terminal receives and stores the reselection parameter sets corresponding to the user grade of the terminal and stores the corresponding relation between the reselection parameter sets and various load grades. And selecting a reselection parameter set corresponding to the load grade from the stored reselection parameter sets by the terminal according to the load grade of the current cell. Therefore, the network side only needs to periodically broadcast the load level of the cell, and the resource of the network side broadcast channel is greatly saved.
In the above embodiments, the load and bandwidth properties of the cell are mainly considered in terms of relating to the cell, but the invention does not exclude consideration of other properties of the cell or a ranking parameter of a cell integrated according to various relevant properties of the cell.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (18)
1. A method for cell reselection in a mobile communication network, comprising the steps of:
the terminal acquires a corresponding reselection parameter set according to the user level of the terminal;
the terminal reselects the cell according to the reselection parameter set;
if a large number of idle terminals reside in a cell with a large current residual load capacity to influence access quality, random access channel access resources are added to the cell.
2. A method for cell reselection in a mobile communication network as claimed in claim 1, wherein said terminal obtains a set of reselection parameters by:
the network side generates at least two reselection parameter sets according to the cell load information and different user grades, and broadcasts the reselection parameter sets in the cell;
and the terminal selects a reselection parameter set from each reselection parameter set broadcasted by the network side according to the user level of the terminal.
3. The cell reselection method in a mobile communication network according to claim 2, wherein said network side generates at least two reselection parameter sets only according to the load information of the serving cell and different user classes; or,
and the network side generates at least two reselection parameter sets according to the load information of the service cell and the adjacent cells thereof and different user grades.
4. A method for cell reselection in a mobile communication network as claimed in claim 1, wherein said terminal obtains a set of reselection parameters by:
the network side broadcasts the cell bandwidth and load information in the service cell;
and the terminal calculates the reselection parameter set according to the bandwidth and load information broadcasted by the network side and by combining the user grade of the terminal.
5. The method for reselecting a cell in a mobile communication network according to claim 4, wherein the network side only broadcasts the bandwidth and load information of the serving cell in the serving cell; or,
and the network side broadcasts the bandwidth and the load information of the serving cell and the adjacent cells thereof together in the serving cell.
6. A method for cell reselection in a mobile communication network as claimed in claim 1, wherein said terminal obtains a set of reselection parameters by:
the network side presets a reselection parameter set corresponding to various load information in the terminal according to the user grade of the terminal;
the network side broadcasts the current load information, and the terminal selects a reselection parameter set corresponding to the load information from each preset reselection parameter set.
7. A method for cell reselection in a mobile communication network as claimed in claim 1, wherein said terminal obtains a set of reselection parameters by:
the network side broadcasts reselection parameter sets corresponding to various user grades and various load information;
the terminal receives and stores each reselection parameter set corresponding to the user grade of the terminal, and stores the corresponding relation between the reselection parameter sets and various load information;
and the network side broadcasts the current load information, and the terminal selects a reselection parameter set corresponding to the load information from each stored reselection parameter set.
8. The method for cell reselection in a mobile communication network according to any one of claims 2 to 7, wherein said load information is a load level.
9. The method for cell reselection in a mobile communication network according to any of claims 1 to 8, wherein said user level is determined by one of the following or any combination thereof: user subscription information, terminal capability, operator policy information.
10. The method for reselecting cells in a mobile communication network according to claim 3 or 5, wherein the base station in the network side obtains the bandwidth and load information of the neighboring cells not belonging to the base station through information interaction with the neighboring base stations; or,
and the base station in the network side obtains the bandwidth and load information of the adjacent cell which does not belong to the base station by measuring the signals of the adjacent cell.
11. A method for cell reselection in a mobile communication network according to any of claims 1 to 8, wherein said reselection parameter set comprises reselection bias parameters.
12. A cell reselection system in a mobile communication network, comprising a terminal side and a network side, wherein the terminal side comprises: a unit for obtaining a corresponding reselection parameter set according to the user level of the terminal; and a unit for cell reselection according to the reselection parameter set;
and when a large number of idle terminals reside in a cell with larger current residual load capacity to influence the access quality, the network side increases the random access channel access resources for the cell.
13. The cell reselection system of claim 12, wherein the network side comprises: a unit for generating at least two reselection parameter sets according to the cell load information and different user grades; means for broadcasting the sets of reselection parameters in the cell;
and the unit for acquiring the reselection parameter set at the terminal side selects one reselection parameter set from each reselection parameter set broadcasted by the network side according to the user level of the terminal side.
14. The system for reselecting a cell in a mobile communication network according to claim 12, wherein the network side includes a unit for broadcasting cell bandwidth and load information in a serving cell;
and the unit for acquiring the reselection parameter set at the terminal side calculates the reselection parameter set according to the bandwidth and load information broadcasted by the network side and by combining the user level of the terminal.
15. The cell reselection system of claim 12, wherein said network side comprises: according to the user grade, sending the reselection parameter sets corresponding to various load grades to a unit of the terminal; and a unit for broadcasting the current load level;
the terminal side also comprises a unit for receiving and storing reselection parameter sets corresponding to various load grades and sent by the network side;
the unit for acquiring the reselection parameter set at the terminal side selects the reselection parameter set corresponding to the load level from the stored reselection parameter sets.
16. The cell reselection system of claim 12, wherein said network side comprises: a unit for broadcasting reselection parameter sets corresponding to various user grades and various load grades, and a unit for broadcasting the current load grade;
the terminal side comprises a unit for receiving and storing each reselection parameter set corresponding to the user grade of the terminal side, and the unit also stores the corresponding relation between the reselection parameter sets and various load grades;
the unit for acquiring the reselection parameter set at the terminal side selects the reselection parameter set corresponding to the load level from the stored reselection parameter sets.
17. A cell reselection system according to any of claims 12 to 16, wherein said user ranking is determined by one or any combination of the following: user subscription information, terminal capability, operator policy information.
18. The cell reselection system of any of claims 12 to 16, wherein said mobile communication network is a long term evolution network.
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