WO2019000873A1

WO2019000873A1 - Method for adjusting modulation and coding scheme (mcs) and base station

Info

Publication number: WO2019000873A1
Application number: PCT/CN2017/118083
Authority: WO
Inventors: 刘震; 廖礼宇
Original assignee: 京信通信系统（中国）有限公司; 京信通信系统（广州）有限公司; 京信通信技术(广州)有限公司; 天津京信通信系统有限公司
Priority date: 2017-06-28
Filing date: 2017-12-22
Publication date: 2019-01-03
Also published as: CN107147475A; CN107147475B

Abstract

Disclosed are a method for adjusting a modulation and coding scheme (MCS) and a base station, achieving the beneficial effect of saving transmission resources. The method for adjusting an MCS comprises: the base station allocates a bandwidth to at least one group calling service according to an order of the adopted preset MCS, wherein terminals under the coverage of the base station are divided into a plurality of groups, each group comprises a plurality of terminals, and the group calling service is a service for calling any terminal or other terminals in any group at the same time; and if the bandwidth allocated to the at least one group calling service is greater than a first preset bandwidth, the base station increases the order of the MCS adopted for the at least one group calling service.

Description

Method for adjusting modulation coding mode and base station

This application claims the priority of the CN patent application filed on June 28, 2017, the Chinese Patent Office, the application number is 201710510407.2, and the invention is entitled "A Modulation and Modulation Method and Base Station", the entire contents of which are incorporated by reference. In this application.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and a base station for adjusting a modulation and coding scheme.

Background technique

In some industries, at the same time, one user needs to know the work of other users and schedule the work of other users. For example, in the property management industry, supervisors need to know the work of the staff they lead to schedule the work of these workers. To this end, the current system can provide group call services. A group call service is a service that occurs in a group consisting of multiple terminals. In a group call service, there can only be one terminal that initiates a call, and the remaining terminals are called parties. For example, the group call service may be a call that occurs in a group consisting of multiple terminals. During the call, one terminal may initiate a call to all other terminals in the group. When the user of the terminal that initiates the call speaks, Users of other terminals in the group can listen at the same time. In this way, a user in a group can know the situation of other users in the group, and it is convenient to schedule the work of other users.

Generally, the terminal can be divided into a plurality of groups according to the services performed by the terminal in advance. For example, terminal A, terminal B, terminal C, terminal D, terminal E, and terminal F, and the services performed by terminal A, terminal B, and terminal C are property management security services, and then terminal A, terminal B, and terminal C can be divided into a group. The service carried out between the terminal D, the terminal E and the terminal F is a railway logistics service, and then the terminal D, the terminal E and the terminal F can be divided into one group. After the terminal is grouped, the group in which the terminal is located may request to access the base station, and the base station may know the number of the group in which the terminal is located in advance, so that the call may be initiated to different groups according to the number of the different group.

When any group under the coverage of the base station needs to perform the group call service, the base station allocates bandwidth for the group call service to transmit the group call service data. In a Long Term Evolution (LTE) system, the channels provided by the system can be shared by all terminals in the system. The base station can adopt multiple modulation and coding schemes (MCS) when transmitting group call service data, such as Quadrature Phase Shift Keyin (QPSK) mode and 16 Quadrature Amplitude Modulation (Quadrature Amplitude Modulation). , 16QAM) mode, or 64QAM mode, etc. Different MCSs correspond to different index values. When the base station selects the MCS, the base station selects the corresponding MCS. For example, if the index value of the MCS is 1, the corresponding MCS is in the QPSK mode, and the index value of the MCS is 3, and the corresponding MCS is in the 16QAM mode. The index value of the MCS is also called the order of the MCS.

Generally, the base station determines how to configure the order of the MCS according to a Channel Quality Indicator (CQI) fed back by the terminal. For a terminal in a Radio Resource Control Connect (RRC Connect), the CQI may be sent to the base station, so that the base station may determine the order of the configured MCS according to the CQI fed back by the terminal in the RRC Connect. In the LTE system, most of the terminals in the group are in the idle state. The terminal in the Idle state cannot feed the CQI back to the base station. Therefore, the base station configures the order of the MCS for all the groups covered by the base station in advance. The larger the order of the MCS, the larger the data transmission rate, that is, the more data needs to be transmitted in the same time period, and within a limited bandwidth, a large amount of data is likely to cause congestion. Therefore, in order to ensure the reliability of data transmission, when the base station configures the initial MCS for all groups, the MCS of a smaller order is pre-configured for all groups.

However, the smaller the order of the MCS is, the smaller the amount of data that each of the allocated resource blocks (RBs) can carry when the base station allocates bandwidth according to the MCS for each group of call services to be performed. Therefore, when the base station allocates bandwidth for the call service to be performed for each group when the order of the smaller MCS is used, it is necessary to allocate more RBs, resulting in waste of transmission resources.

Summary of the invention

The embodiments of the present invention provide a method for adjusting a modulation and coding mode and a base station, which have the beneficial effects of saving transmission resources.

In a first aspect, an embodiment of the present invention provides a method for adjusting a modulation and coding method, where the adjustment method includes:

The base station allocates bandwidth to the at least one group call service according to the order of the preset modulation and coding mode MCS. The terminal under the coverage of the base station is divided into multiple groups, where each group includes multiple terminals, and the group call service is arbitrary. A service in which a terminal simultaneously makes a call with another terminal in any one of the groups;

If the bandwidth allocated for the at least one group call service is greater than the first preset bandwidth, the base station increases the order of the MCS adopted by the at least one group call service.

Optionally, the base station increases an order of the MCS used by the at least one group call service, including:

The base station selects, from the at least one group call service, the M group call service whose value of the downlink channel quality indicator CQI of the group is greater than the first threshold; wherein the value of the CQI of the group is included in the group The average value of the CQI values reported by multiple terminals, M is a positive integer;

The base station increases the order of the M MCSs respectively used for the M group call services.

Optionally, it also includes:

If the bandwidth allocated for the at least one group call service is less than or equal to the first preset bandwidth, the base station determines whether the bandwidth allocated by the at least one group call service is smaller than a second preset bandwidth; The second preset bandwidth is smaller than the first preset bandwidth;

If the bandwidth allocated for the at least one group call service is smaller than the second preset bandwidth, the base station reduces the order of the MCS adopted by the at least one group call service.

Optionally, the base station reduces an order of the MCS adopted by the at least one group call service, including:

And selecting, by the base station, the N group call services whose value of the downlink channel quality indicator CQI of the group is smaller than the second threshold, where the value of the CQI of the group is included in the one group The average value of the CQI values reported by multiple terminals, where N is a positive integer;

The base station reduces the order of the N MCSs respectively adopted by the N group call services.

Optionally, the average value of the CQI values reported by the multiple terminals included in the group is:

The average value of the value of the CQI reported by the terminal in the radio resource control protocol connection RRC CONNECT state and the value of the CQI reported by the terminal in the radio resource control protocol idle RRC IDLE state in the one group.

In a second aspect, an embodiment of the present invention provides a base station, where the base station includes:

An allocating module, configured to allocate a bandwidth for the at least one group call service according to the adopted preset modulation and coding mode MCS; wherein, the terminal covered by the base station is divided into multiple groups, where each group includes multiple terminals, and the group The calling service is a service in which any one terminal simultaneously makes a call with another terminal in any one group;

The adjusting module is configured to: if the bandwidth allocated for the at least one group call service is greater than the first preset bandwidth, the base station increases an order of the MCS used by the at least one group call service.

Optionally, the adjusting module increases an order of the MCS used by the at least one group call service, including:

And the adjusting module selects, from the at least one group call service, the M group call services whose value of the downlink channel quality indicator CQI of the group is greater than the first threshold; wherein, the value of the CQI of the group is included in the group The average value of the CQI values reported by multiple terminals, M is a positive integer;

The adjustment module increases the order of the M MCSs used for the M group call services.

Optionally, the adjustment module is further configured to:

If the bandwidth allocated for the at least one group call service is less than or equal to the first preset bandwidth, the adjustment module determines whether the bandwidth allocated by the at least one group call service is smaller than a second preset bandwidth; The second preset bandwidth is smaller than the first preset bandwidth;

And if the bandwidth allocated for the at least one group call service is smaller than the second preset bandwidth, the adjusting module reduces an order of the MCS adopted by the at least one group call service.

Optionally, the adjusting module reduces an order of the MCS used by the at least one group call service, including:

The adjusting module selects, from the at least one group call service, the N group call services whose value of the downlink channel quality indicator CQI of the group is smaller than the second threshold; wherein the value of the CQI of the group includes the group The average value of the CQI values reported by multiple terminals, N is a positive integer;

The adjustment module reduces an order of N MCSs respectively adopted for the N group call services.

In the embodiment of the present invention, the base station adjusts the order of the MCS according to the preset bandwidth of the MCS for the bandwidth allocated by the at least one group call service, and if the bandwidth allocated for the at least one group call service is greater than the first preset bandwidth, Then, the bandwidth allocated by the base station for the at least one group call service is large, and may be close to the maximum bandwidth supported by the base station. At this time, the base station may increase the order of the MCS, so that the order of the increased MCS is at least one group call. The service redistributes the bandwidth, so that the allocated one RB can carry more data, and the number of RBs to be allocated is less, thereby saving transmission resources.

DRAWINGS

FIG. 1 is a schematic structural diagram of a trunking communication system according to an embodiment of the present invention;

2 is a flowchart of a method for adjusting a modulation and coding mode according to an embodiment of the present invention;

3 is a schematic diagram of a method for adjusting a modulation and coding method in the prior art, which results in limited system capacity;

FIG. 4 is a schematic diagram of a solution for limiting system capacity according to an embodiment of the present invention; FIG.

FIG. 5 is a schematic diagram of a solution for limiting system capacity according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention.

First, an application scenario of an embodiment of the present invention is introduced.

Please refer to FIG. 1. FIG. 1 is a structural diagram of a communication system. Figure 1 includes a base station 101 and a plurality of terminals 102. The base station 101 can be an evolved base station (Evolved Node B, eNB or e-NodeB), and the terminal 102 is a terminal used by the user, such as a walkie-talkie. One can divide the plurality of terminals 102 into a plurality of groups according to the services performed between the plurality of terminals 102 in advance, and each group can include a plurality of terminals 102. After the multiple terminals 102 are divided into multiple groups, the group in which the terminal 102 is located may request access to the base station. The base station may know the number of the group in which the terminal 102 is located in advance, so that calls may be initiated to different groups according to different group numbers. For example, the service carried out between the three terminals 102 is the property management security service, and the three terminals are divided into one group, and the service between the four terminals 102 is the railway logistics service, and the four terminals are divided. For a group. FIG. 1 is exemplified by dividing 10 terminals 102 covered by the base station 101 into three groups, namely, group 1, group 2, and group 3.

Any one of the terminals 102 can actively initiate a call to other terminals 102 in any one of the groups, and other terminals 102 in the group are called parties. The terminal 102 that initiates the call and the called terminal 102 may be in the same group or may not be in the same group. FIG. 1 takes an example in which any one of the terminals 102 that initiated the call is in the same group as the called terminal 102. When the user speaks through the terminal 102 that initiated the call, the users in the group who use the other terminal 102 can simultaneously listen. When the group call service is performed, the terminal 102, which is the originating call, transmits data to the base station 101, and the base station 101 transmits the received data to the other terminals 102 participating in the group call service.

The embodiment of the present invention provides a method for adjusting a modulation and coding mode and a base station, where the base station 101 allocates bandwidth for at least one group call service according to a preset MCS order. Then, the order of the MCS may be adjusted according to the size of the bandwidth allocated for the at least one group call service. If the bandwidth allocated for the at least one group call service is wider, for example, close to the maximum bandwidth supported by the base station 101, the base station 101 may Increase the order of the MCS. The base station 101 reallocates the bandwidth for the at least one group call service according to the increased order of the MCS, and the allocated one RB can carry more data, and the number of RBs to be allocated is less, thereby saving transmission resources. Increased system capacity.

The technical solutions provided by the embodiments of the present invention are described below with reference to the accompanying drawings.

According to the communication system architecture diagram shown in FIG. 1 , an embodiment of the present invention provides a method for adjusting the modulation and coding mode. The embodiment is illustrated in FIG. 1 and is not limited to the one shown in FIG. 1 . The system architecture shown. The adjustment method can be performed by the base station 101. Referring to FIG. 2, the process of the adjustment method is described as follows:

S201: The base station 101 allocates bandwidth to the at least one group call service according to the preset order of the MCS, where the terminal 102 covered by the base station 101 is divided into multiple groups, where each group includes multiple terminals 102, and the group call service A service for simultaneously calling any one of the terminals 102 and other terminals 102 in any one of the groups;

S202: If the bandwidth allocated for the at least one group call service is greater than the first preset bandwidth, the base station 101 increases the order of the MCS adopted for the at least one group call service.

The base station 101 covers a plurality of groups. For any group that is covered by the base station 101, when there is a group call service, the base station 101 allocates bandwidth for the group call service. If there is no group call service, the base station 101 does not need to be the group call service. Allocate bandwidth. When a group has a group call service, the group sends a request message to the base station 101, where the request message is used to request the base station 101 to allocate bandwidth for the group call service to be performed by the group, and the base station 101 receives the request message sent by the group. Bandwidth is allocated for the corresponding group call service. The base station 101 allocates bandwidth for each group of the transmission request message according to the order of the adopted MCS, that is, allocates bandwidth for the group call service to be performed for each group that transmits the request message. Generally, the base station 101 pre-configures the order of the MCS, so the base station 101 can directly allocate bandwidth for the group call service to be performed for each group of the transmission request message according to the order of the pre-configured MCS.

The base station 101 allocates bandwidth for a group call service according to the order of the pre-configured MCS, and can be implemented by allocating RBs. For example, the order of the MCS is 6, the bandwidth of one RB is 180 kHz, and the group call service performed by one group. The required bandwidth is 900 kHz, and the base station 101 needs to allocate 5 RBs for this group of services. Of course, the base station 101 may allocate a bandwidth for a group by allocating a resource element (Resource Element, RE), or allocate a bandwidth for a group by assigning a scheduling block (SB), and the embodiment of the present invention passes the base station 101. There is no limit to which way to allocate bandwidth for a group.

In order to ensure the reliability of data transmission, in general, the order of the MCS pre-configured by the base station 101 is small. When the base station 101 allocates bandwidth for the group call service by using the MCS of the smaller order, the amount of data that can be carried by the allocated one RB is smaller, so the base station 101 allocates bandwidth for the group call service when the MCS of the smaller order is used. Therefore, more RBs need to be allocated, resulting in waste of system resources. At this time, if there is a new terminal 102 to join a certain group, the new terminal 102 may not join a certain group due to insufficient resources available to the base station 101. That is, the number of terminals 102 that the base station 101 can join is limited, and the number of terminals 102 corresponding to the group call service supported by the base station 101 is small, and the capacity of the system is small.

Therefore, in the embodiment of the present invention, after the base station 101 allocates bandwidth to the at least one group call service according to the preset smaller order MCS, the base station 101 may also appropriately adjust the order of the MCS. For example, the base station 101 appropriately increases the order of the MCS to maximize the capacity of the system, or the base station appropriately reduces the order of the MCS to improve the reliability of data transmission. This saves transmission resources and helps to increase the capacity of the system.

In the embodiment of the present invention, after the base station 101 allocates bandwidth to the at least one group call service according to the preset MCS, the first time, the base station 101 may determine whether the bandwidth allocated by the at least one group call service is greater than the first preset bandwidth. If the bandwidth allocated for the at least one group call service is greater than the first preset bandwidth, the bandwidth allocated by the base station 101 for the at least one group call service may be considered to be close to the maximum bandwidth supported by the base station 101. The first preset bandwidth may be set according to the maximum bandwidth supported by the base station 101. For example, the first preset bandwidth may be 90%, or 80%, of the maximum bandwidth supported by the base station 101.

If the bandwidth allocated by the base station 101 for at least one group call service is close to the maximum bandwidth supported by the base station 101, the available resources of the system are small. Then, the base station 101 can increase the order of the MCS used for the at least one group call service, so that the subsequent base station 101 allocates bandwidth to the at least one group call service according to the increased order of the MCS, and allocates one RB. The amount of data that can be carried is large, and the number of allocated RBs is small, thereby saving transmission resources and helping to increase the capacity of the system.

However, the larger the order of the MCS, the larger the data transmission rate, that is, the more data needs to be transmitted in the same period of time, and within a limited bandwidth, a large amount of data is likely to cause congestion. That is to say, the MCS with a larger order can only be applied to the terminal 102 with better channel quality. In fact, the channel quality of the terminal 102 participating in each group call service is better and some are worse. If the base station 101 increases the order of the MCS used for all group call services, then for the group with poor channel quality, it is possible that the terminal 102 in the group cannot receive the data transmitted by the base station 101 at all, that is, The reliability of data transmission cannot be guaranteed. Therefore, when the base station 101 increases the order of the MCS used for the at least one group call service, the base station 101 may select a group call service with a better channel quality of the group in the at least one group call service, and then increase the selected group call service. The order of the MCS used by the group call service. Thus, for a group with poor channel quality, the order of the MCS is not increased, and the reliability of data transmission can be maintained. For a group with better channel quality, increasing the order of the MCS can ensure the reliability of data transmission, and can also save transmission resources and improve the capacity of the system.

When the base station 101 selects the group call service with the better channel quality of the group of the group call service from the at least one group call service, the base station 101 may sort the group call service according to the CQI value of each group call service corresponding group from the largest to the smallest. And then selecting the first M group call services, and the CQI values of the selected M group call service corresponding groups are greater than the first threshold. Wherein, M is a positive integer, and the value of CQI of one group is an average value of values of CQIs reported by a plurality of terminals 102 included in a group, and the first threshold may be a preset value, if the value of CQI of one group is greater than A threshold value can be considered that the channel quality of the group is good.

Since the value of the CQI of a group is changed, for example, the value of the CQI of a certain group is large at the previous moment, but the value of the CQI of the group is small at the next moment. If the base station 101 increases the order of the M MCSs used for the M group call services by a large amount at a time, the reliability of the data transmission cannot be guaranteed for the group of the next smaller CQI value. Therefore, when the base station 101 increases the order of the MCS used for the M group call services, the increased amplitude is small. For example, the magnitude of the order of increasing the MCS may be 1 and does not change too much. The reliability of data transmission cannot be guaranteed. After the base station 101 increases the order of the MCS, the bandwidth is allocated to the at least one group call service according to the increased order of the MCS. If the bandwidth allocated for the at least one group call service is still greater than the first preset bandwidth, the base station 101 You can continue to increase the order of the MCS used by the group call service with better channel quality. You can still increase the order of the MCS by one to ensure the reliability of data transmission and increase the capacity of the system.

In the embodiment of the present invention, if the bandwidth allocated by the base station 101 for the at least one group call service is less than or equal to the first preset bandwidth, it may be further determined whether the bandwidth allocated by the at least one group call service is smaller than the second preset bandwidth. The second preset bandwidth is smaller than the first preset bandwidth. For example, the second preset bandwidth may be 50%, or 40%, of the maximum bandwidth supported by the base station 101. If the bandwidth allocated by the base station 101 for at least one group call service is less than the second preset bandwidth, then the system may be considered to have more available resources. In this case, the base station 101 can appropriately reduce the order of the MCS adopted for the at least one group call service, so as to improve the reliability of data transmission as much as possible when the system still has more available resources.

The base station 101 allocates bandwidth for the group call service by using the MCS of the smaller order, and the smaller the amount of data that can be carried by the allocated one RB, the less data needs to be transmitted in the same time period, and the probability that the data transmission succeeds. Large, therefore, a smaller order MCS is more suitable for use in terminal 102 with poor channel quality. However, for the terminal 102 with better channel quality, it is not necessary to reduce the order of the MCS, otherwise the rate of data transmission is reduced and the efficiency of the system is also reduced.

The channel quality of the terminal 102 participating in each group call service is better or worse. If the base station 101 reduces the order of the MCS used for all group call services, the data transmission rate is lowered, and the system is The efficiency is also reduced. Therefore, in consideration of the group having a better channel quality, the base station 101 may first select the channel quality of the group in which the group is located from the at least one group call service when the order of the MCS used for the at least one group call service is reduced. The group calls the service, and then reduces the order of the MCS used for the selected group call service. Thus, for a group with poor channel quality, reducing the order of the MCS can improve the reliability of data transmission.

When the base station 101 selects the group call service with the poor channel quality of the group in the group call service, the base station 101 may sort the group call service according to the CQI value of each group call service corresponding group from the largest to the smallest. Then, the first N group call services are selected, and the CQI values of the selected N group call service corresponding groups are all smaller than the second threshold. Wherein, N is a positive integer, the value of CQI of one group is an average value of values of CQIs reported by a plurality of terminals 102 included in one group, and the second threshold may be a value set in advance, if the value of CQI of one group is smaller than For the second threshold, the channel quality of the group can be considered to be poor.

Since the value of the CQI of the group in which at least one group call service is located is changed, for example, the value of the CQI of a certain group is higher at the previous moment, but the value of the CQI of the group is smaller at the next moment. If the base station 101 reduces the order of the MCS used for the N group call services at a time, the rate of data transmission is also reduced for the group of higher CQI values at the next moment, thereby reducing the system transmission data. The efficiency is not necessary. Therefore, when the base station 101 reduces the order of the MCS adopted for the N group call services, the reduced amplitude is small. For example, the magnitude of the order of the reduced MCS may be 1 and does not change too much. Try to avoid reducing the efficiency of the system to transfer data. After the base station 101 reduces the order of the MCS, the bandwidth is allocated to the at least one group call service according to the reduced MCS order. If the bandwidth allocated for the at least one group call service is still less than the second preset bandwidth, the base station 101 You can continue to reduce the order of the MCS used by the group call service with poor channel quality. You can still reduce the order of the MCS by one to maximize the reliability of data transmission while the system capacity is large. Sex.

In the embodiment of the present invention, the average value of the CQI values reported by the plurality of terminals 102 included in a group may be the CQI reported by the terminal 102 in the radio resource control protocol (RRC CONNECT) in a group. The value and the average value of the CQI values reported by the terminal 102 in the Radio Resource Control Idle (RRC IDLE) state.

In the LTE system, all the terminals share the downlink channel. Generally, in the plurality of terminals 102 included in one group, some terminals 102 are in the RRC CONNECT state, and some terminals 102 are in the RRC IDLE state, and the base station 101 is in the RRC IDLE state. The terminal 102 in the RRC CONNECT state formulates a corresponding CQI feedback mechanism, and the base station 101 allocates the bandwidth of the group in which the group call service is located according to the value of the CQI fed back by the terminal 102 in the RRC CONNECT state. However, if the channel quality of the terminal 102 in the RRC IDLE state is good, the base station 101 allocates only the bandwidth of the group in which the group call service is located according to the value of the CQI fed back by the terminal 102 in the RRC CONNECT state, which is obviously less accurate.

Therefore, in the embodiment of the present invention, the average value of the CQI values reported by the plurality of terminals 102 included in a group includes the value of the CQI reported by the terminal 102 in the RRC CONNECT state in one group, and the terminal in the RRC IDLE state. The average value of the CQI values reported by 102, that is, considering the channel quality of all terminals 102 in a group, allocates bandwidth for at least one group call service according to the value of CQI of all terminals 102, so as to maximize the accuracy of the allocated bandwidth. degree.

In a possible implementation manner, the manner of the value of the CQI reported by the terminal 102 in the RRC IDLE state may be implemented in the following manner. The base station 101 can transmit a measurement command to the terminal 102 in the RRC IDLE state, which can request the terminal 102 in the RRC IDLE state to measure the quality of the downlink channel. After the terminal 102 in the RRC IDLE state measures, the value of the CQI is transmitted to the base station 101. In order to reduce the burden on the base station 101, if the value of the CQI measured by the terminal 102 in the RRC IDLE state is greater than the third threshold, and the third threshold is used to indicate that the channel quality of the group in which the terminal 102 is located is good, the terminal 102 in the RRC IDLE state does not. The value of the measured CQI is transmitted to the base station 101. At this time, the value of the CQI of the terminal 102 that the base station 101 can default to in the RRC IDLE state is the third threshold.

For a better understanding, the following describes a method in which the base station 101 adjusts the order of the MCS by taking the order of the MCS preset by the base station 101 as 6.

The base station 101 is configured with an order of the initial MCS, for example, the order of the MCS is 6. The base station 101 allocates bandwidth for the group call service according to the MCS of the order of 6. The base station 101 can determine the number of RBs to be allocated for the group call service according to the current MCS value and the size of an RB that currently needs to transmit the group call service. Specifically, the base station 101 can determine the number of RBs to be allocated for the group call service by looking up Table 7.1.7.2.1-1 in 3GPP TS 36.213. For example, the size of an RB that needs to transmit the group call service is 1128 bits, and the order of the MCS is 6. The base station 101 needs to allocate at least 11 RB resources for the group call service.

Please refer to FIG. 3. FIG. 3 is a schematic diagram of the method for adjusting the MCS in the prior art, which results in limited system capacity. As shown in FIG. 3, the base station 101 has scheduled four groups of group call services at the current subframe number of the system frame number (SFN) of n: group 0 to group 3, with the group call service. For example, the group 40 also establishes a request with the base station 101, and is also allocated to the subframe number of 0 for scheduling. According to the prior art method, if the group 0 to the group 3 and the group 40 correspond to the order of the smaller MCS. The number of RBs required for the number, for example, 6, group 0 to group 3, group 40, easily exceeds the maximum number of RBs corresponding to the maximum bandwidth supported by the base station 101. When this occurs, the prior art can only schedule part of the group call service, for example, group 40 into the next frame, for example, scheduling the subframe number of SFN=n+1 to be 1. As a result, the scheduling delay is increased. Especially in the case that the number of group call services is increased, the scheduling delay of the group call service will be greatly increased, and finally the capacity of the system is limited.

Referring to FIG. 4, FIG. 4 is a schematic diagram of a solution for limiting system capacity according to an embodiment of the present invention. As shown in FIG. 4, the base station 101 detects that the total number of RB requirements of at least one group call service is greater than a preset threshold when the subframe number of SFN=n+1 is 0, and then groups 0 to 3 are included according to the group. The average value of the values of the CQIs reported by the plurality of terminals 102 is sorted from large to small. Wherein, if the maximum bandwidth supported by the base station 101 is 20 MHz, the preset threshold may be 100. The base station 101 can select the first three group call services in the group 0 to group 3, for example, group 0 to group 2, and add 1 to the order of the MCS used for the three group call services, that is, 7. Since the order of the MCS of the group 0 to the group 2 is increased to 7, the amount of data carried by one RB becomes large, and the number of RBs allocated by the base station 101 for the group 0 to the group 2 is small, so that redundant data can be reserved. The RB resources are used by the group 40, and finally the total number of RBs required for the group 0 to group 3 and the group 40 is not greater than a preset threshold, for example, 100. Wrong with the figure! The reference source was not found. Compared with the method shown in Figure 3, the group 40 will not be placed in the next frame for scheduling, the scheduling delay will not be affected, and the group call capacity is guaranteed.

Referring to FIG. 5, FIG. 5 is a schematic diagram of a solution for limiting system capacity according to an embodiment of the present invention. As shown in FIG. 5, the base station 101 has an order of 15 for the MCS used for the group 0 to the group 3 at the sub-frame number of SFN=n. The group call service group 2 and the group 3 perform service release at SFN=n, and the base station 101 performs the last scheduled transmission on the group 2 and the group 3 at the subframe number of 0 in SFN=n. The base station 101 detects the number of RB requirements of the remaining group call when the subframe number of SFN=n+1 is 0, that is, the total number of RB requirements of group 0 and group 1 is less than a preset threshold. For example, the maximum bandwidth supported by the base station 101 is At 20 MHz, the preset threshold may be 50. Then, the average value of the CQI values reported by the group 0 to the group 3 according to the plurality of terminals 102 included in the group is sorted from small to large. The base station 101 can select the first two group call services in the group 0 to group 3, for example, the selected first group call service is group 0 to group 1, and reduce the MCS used for the two group call services. The order of, for example, 14. If, at this time, the base station 101 determines that the total number of RB requirements required for the group 0 to the group 1 is still less than 50, the order of the MCS is further decreased by 1 until the total number of RB requirements of the group 0 and the group 1 is not less than 50, for example, The base station 101 finally configures the order of the MCS to be 7. It can be seen that when the number of group call services is reduced, the base station 101 can satisfy the data transmitted by the base station 101 reliably by all the terminals in the group as much as possible by appropriately reducing the order of the MCS.

The device provided by the embodiment of the present invention is described below with reference to the accompanying drawings.

Referring to FIG. 6, based on the same inventive concept, an embodiment of the present invention provides a base station 101, which may include an allocation module 601 and an adjustment module 602. The allocation module 601 can be configured to allocate bandwidth to the at least one group call service according to the order of the preset modulation and coding mode MCS, where the terminal covered by the base station 101 is divided into multiple groups, where each group includes multiple terminals. 102. The group call service is a service in which any one of the terminals 102 simultaneously performs a call with another terminal 102 in any one of the groups. The adjusting module 602 can be configured to: if the bandwidth allocated for the at least one group call service is greater than the first preset bandwidth, the base station 101 increases the order of the MCS adopted for the at least one group call service.

Optionally, the adjusting module 602 increases the order of the MCS used by the at least one group call service, including:

The adjustment module 602 selects, from the at least one group call service, the M group call services whose value of the downlink channel quality indicator CQI of the group is greater than the first threshold, where the value of the CQI of the group is a plurality of terminals 102 included in the group. The average value of the reported CQI, M is a positive integer;

The adjustment module 602 increases the order of the M MCSs respectively used for the M group call services.

Optionally, the adjustment module 602 is further configured to:

If the bandwidth allocated for the at least one group call service is less than or equal to the first preset bandwidth, the adjustment module 602 determines whether the bandwidth allocated by the at least one group call service is smaller than the second preset bandwidth; wherein the second preset bandwidth is smaller than the second preset bandwidth a preset bandwidth;

If the bandwidth allocated for the at least one group call service is less than the second preset bandwidth, the adjustment module 602 reduces the order of the MCS adopted for the at least one group call service.

Optionally, the adjusting module 602 reduces the order of the MCS adopted by the at least one group call service, including:

The adjustment module 602 selects, from the at least one group call service, the N group call services whose value of the downlink channel quality indicator CQI of the group is smaller than the second threshold, where the value of the CQI of one group is multiple terminals 102 included in one group. The average value of the reported CQI, N is a positive integer;

The adjustment module 602 reduces the order of the N MCSs respectively adopted for the N group call services.

Optionally, the average value of the CQI values reported by the multiple terminals 102 included in one group is:

The average value of the value of the CQI reported by the terminal 102 in the radio resource control protocol connection RRC CONNECT state and the value of the CQI reported by the terminal 102 in the radio resource control protocol idle RRC IDLE state.

The base station 101 can be used to perform the method provided by the embodiment shown in FIG. 2. Therefore, for the functions that can be implemented by the functional modules in the base station 101, reference may be made to the corresponding description in the embodiment shown in FIG. 2, and details are not described herein.

In the embodiment of the present invention, the base station adjusts the order of the MCS according to the preset bandwidth of the MCS for the bandwidth allocated by the at least one group call service, and if the bandwidth allocated for the at least one group call service is greater than the first preset bandwidth, Then, the bandwidth allocated by the base station for the at least one group call service is large, and may be close to the maximum bandwidth supported by the base station. At this time, the base station may increase the order of the MCS, so that the order of the increased MCS is at least one group call. The service redistributes the bandwidth, so that the allocated one RB can carry more data, and the number of RBs to be allocated is less, thereby saving transmission resources and increasing the capacity of the system.

It will be clearly understood by those skilled in the art that for the convenience and brevity of the description, only the division of each functional module described above is exemplified. In practical applications, the above function assignment can be completed by different functional modules as needed. The internal structure of the device is divided into different functional modules to perform all or part of the functions described above. For the specific working process of the system, the device and the unit described above, reference may be made to the corresponding process in the foregoing method embodiments, and details are not described herein again.

In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be used. Combinations can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application, in essence or the contribution to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: a Universal Serial Bus flash disk, a mobile hard disk, a ROM (Read-Only Memory), a RAM (Random Access Memory), a disk. Or a variety of media such as optical discs that can store program code.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A method for adjusting a modulation and coding method, comprising:

The base station allocates bandwidth to the at least one group call service according to the order of the preset modulation and coding mode MCS. The terminal under the coverage of the base station is divided into multiple groups, where each group includes multiple terminals, and the group call service is arbitrary. A service in which a terminal simultaneously makes a call with another terminal in any one of the groups;

If the bandwidth allocated for the at least one group call service is greater than the first preset bandwidth, the base station increases the order of the MCS adopted by the at least one group call service.
The method according to claim 1, wherein the base station increases the order of the MCS adopted by the at least one group call service, including:

The base station selects, from the at least one group call service, the M group call service whose value of the downlink channel quality indicator CQI of the group is greater than the first threshold; wherein the value of the CQI of the group is included in the group The average value of the CQI values reported by multiple terminals, M is a positive integer;

The base station increases the order of the M MCSs respectively used for the M group call services.
The method of claim 1 further comprising:

If the bandwidth allocated for the at least one group call service is less than or equal to the first preset bandwidth, the base station determines whether the bandwidth allocated by the at least one group call service is smaller than a second preset bandwidth; The second preset bandwidth is smaller than the first preset bandwidth;

If the bandwidth allocated for the at least one group call service is smaller than the second preset bandwidth, the base station reduces the order of the MCS adopted by the at least one group call service.
The method according to claim 3, wherein the base station reduces the order of the MCS adopted by the at least one group call service, including:

And selecting, by the base station, the N group call services whose value of the downlink channel quality indicator CQI of the group is smaller than the second threshold, where the value of the CQI of the group is included in the one group The average value of the CQI values reported by multiple terminals, where N is a positive integer;

The base station reduces the order of the N MCSs respectively adopted by the N group call services.
The method according to claim 2 or 4, wherein the average value of the CQI values reported by the plurality of terminals included in the group is:

The average value of the value of the CQI reported by the terminal in the radio resource control protocol connection RRC CONNECT state and the value of the CQI reported by the terminal in the radio resource control protocol idle RRC IDLE state in the one group.
A base station, comprising:

An allocating module, configured to allocate a bandwidth for the at least one group call service according to the adopted preset modulation and coding mode MCS; wherein, the terminal covered by the base station is divided into multiple groups, where each group includes multiple terminals, and the group The calling service is a service in which any one terminal simultaneously makes a call with another terminal in any one group;

The adjusting module is configured to: if the bandwidth allocated for the at least one group call service is greater than the first preset bandwidth, the base station increases an order of the MCS used by the at least one group call service.
The base station according to claim 6, wherein the adjusting module increases the order of the MCS adopted by the at least one group call service, including:

And the adjusting module selects, from the at least one group call service, the M group call services whose value of the downlink channel quality indicator CQI of the group is greater than the first threshold; wherein, the value of the CQI of the group is included in the group The average value of the CQI values reported by multiple terminals, M is a positive integer;

The adjustment module increases the order of the M MCSs used for the M group call services.
The base station according to claim 6, wherein the adjustment module is further configured to:

If the bandwidth allocated for the at least one group call service is less than or equal to the first preset bandwidth, the adjustment module determines whether the bandwidth allocated by the at least one group call service is smaller than a second preset bandwidth; The second preset bandwidth is smaller than the first preset bandwidth;

And if the bandwidth allocated for the at least one group call service is smaller than the second preset bandwidth, the adjusting module reduces an order of the MCS adopted by the at least one group call service.
The base station according to claim 8, wherein the adjustment module reduces the order of the MCS adopted by the at least one group call service, including:

The adjusting module selects, from the at least one group call service, the N group call services whose value of the downlink channel quality indicator CQI of the group is smaller than the second threshold; wherein the value of the CQI of the group includes the group The average value of the CQI values reported by multiple terminals, N is a positive integer;

The adjustment module reduces an order of N MCSs respectively adopted for the N group call services.
The base station according to claim 7 or 9, wherein the average value of the CQI values reported by the plurality of terminals included in the one group is:

The average value of the value of the CQI reported by the terminal in the radio resource control protocol connection RRC CONNECT state and the value of the CQI reported by the terminal in the radio resource control protocol idle RRC IDLE state in the one group.