CN112788541B

CN112788541B - Unicast complementary construction method and device for 3GPP multicast scene

Info

Publication number: CN112788541B
Application number: CN201911080257.1A
Authority: CN
Inventors: 成建敏; 方伟
Original assignee: Chengdu TD Tech Ltd
Current assignee: Chengdu TD Tech Ltd
Priority date: 2019-11-07
Filing date: 2019-11-07
Publication date: 2022-06-07
Anticipated expiration: 2039-11-07
Also published as: CN112788541A

Abstract

The embodiment of the invention provides a unicast complementary construction method and a unicast complementary construction device for a 3GPP multicast scene. The method comprises the following steps: receiving a measurement report sent by a user, wherein the measurement report comprises channel quality and a group state; when the user is determined to need to build a unicast due to the channel quality and the group state is activated, if the number of the current available unicast users is smaller than or equal to a preset reserved unicast threshold value, the number of users with potential unicast requirements is larger than or equal to the reserved unicast threshold value and the user supports channel preemption, a built unicast user with the channel quality which is most superior to the channel quality of the user is determined from a user list of built unicast; and preempting the unicast channel of the supplemented unicast user to execute unicast supplement for the user. The embodiment of the invention can determine whether to allow to build unicast according to the channel capacity, the user preemption capacity and the available unicast resource of the cell, and users with poor signals can obtain the preferential compensation opportunity.

Description

Unicast complementary construction method and device for 3GPP multicast scene

Technical Field

The invention belongs to the technical field of Long Term Evolution (LTE), and particularly relates to a unicast complementary construction method and device for a third generation partnership project (3GPP) multicast scene.

Background

In order to effectively utilize the resources of the mobile network, the 3GPP standardization organization proposes a Multicast and Broadcast Service (MBMS), which provides a point-to-multipoint Service that a data source sends data to multiple users in the mobile network, thereby implementing network resource sharing and improving the utilization rate of the network resources, especially the air interface resources. The MBMS defined by 3GPP not only enables pure text low-rate message-like multicast and broadcast, but also enables multicast and broadcast of high-speed multimedia services, which undoubtedly follows the trend of future mobile data development.

The original intention of multicast technology is to send information in the form of a "best effort" in an IP network to a certain target group, which is called a multicast group. When the active host sends information requirement to the multipoint target host, the source host only sends one piece of data, and the destination address of the data is the multicast group address. All members belonging to the group may receive a copy of the data sent by the primary host. The multicast mode solves the problems of repeated copying of data and repeated occupation of bandwidth under the unicast condition and also solves the problem of bandwidth resource waste under the broadcast mode. In many cases (for example, in a private network system), the wireless pipe resources are limited, the channel quality fluctuates, the 3GPP multicast channel adopts a constant demodulation mode, and the monitoring requirement of the group user cannot be met when the channel condition or capacity is not met.

In the prior art, generally, a uniform policy is used to perform unicast repair or unicast deletion on users with varying channel quality, where the group unicast user repair generally follows the principle of first come and first obtained. However, when the number of unicast users in the active group is high and the number of users in the cell is full, there may be a situation where users with poor signals cannot get the opportunity to compensate.

Disclosure of Invention

The embodiment of the invention provides a unicast complementary construction method and a unicast complementary construction device for a 3GPP multicast scene.

The technical scheme of the embodiment of the invention is as follows:

a unicast complementary construction method of a 3GPP multicast scene is applicable to a base station, and comprises the following steps:

receiving a measurement report sent by a user, wherein the measurement report comprises channel quality and a group state;

when the user is determined to need to build a unicast due to the channel quality and the group state is activated, if the number of the current available unicast users is smaller than or equal to a preset reserved unicast threshold value, the number of users with potential unicast requirements is larger than or equal to the reserved unicast threshold value and the user supports channel preemption, a built unicast user with the channel quality which is most superior to the channel quality of the user is determined from a user list of the built unicast;

and preempting the unicast channel of the supplemented unicast user to execute unicast supplement for the user.

In one embodiment, the method further comprises:

and when the user is determined to need to establish unicast for the reason of mobility and the group state is activated, performing unicast establishment for the user.

In one embodiment, the method further comprises:

and when the user is determined to need to establish unicast for the reason of channel quality and the group state is activated, if the number of the current available unicast users is larger than a preset reserved unicast threshold value, executing unicast establishment for the user.

In one embodiment, the method further comprises:

and when the user is determined to need to build unicast due to the channel quality and the group state is activated, if the number of the current available unicast users is less than or equal to a preset reserved unicast threshold value, the number of users with potential unicast requirements is less than the reserved unicast threshold value and the user supports channel preemption, executing unicast building for the user.

In one embodiment, the channel quality includes reference signal received power, RSRP, signal to interference plus noise ratio, SINR, and multicast channel packet loss ratio; the method further comprises the following steps:

when the RSRP is gradually reduced and the SINR is gradually reduced in the preset time, determining that the user needs to build a unicast due to the channel quality, and setting the user as a user with potential unicast requirements;

when the RSRP jitter exceeds the RSRP jitter threshold value in the preset time, determining that the user needs to build a unicast due to the channel quality, and setting the user as a user with potential unicast requirements;

when the SINR jitter exceeds an SINR jitter threshold value in preset time, determining that the user needs to build a unicast due to the channel quality, and setting the user as a user with potential unicast requirements;

and when the packet loss rate of the multicast channel exceeds a packet loss rate threshold value within a preset time, determining that the user needs to build a unicast due to the channel quality, and setting the user as a user with potential unicast requirements.

A unicast complementary construction device of a 3GPP multicast scene, which is applicable to a base station, comprises:

a receiving module, configured to receive a measurement report sent by a user, where the measurement report includes channel quality and a group status;

a determining module, configured to determine, when it is determined that the user needs to make up unicast due to channel quality and the group status is activated, a supplemented unicast user whose channel quality is most superior to the channel quality of the user from a list of users who have made up unicast, if the number of currently available unicast users is less than or equal to a predetermined reserved unicast threshold, the number of users with potential unicast demands is greater than or equal to the reserved unicast threshold, and the user supports channel preemption;

and the unicast complementation module is used for preempting the unicast channel of the complemented unicast user to execute unicast complementation for the user.

In one embodiment, the unicast padding module is further configured to perform unicast padding for the user when it is determined that the user needs to pad unicast for a mobility reason and the group status is activated.

In an embodiment, the unicast padding module is further configured to, when it is determined that the user needs to pad unicast due to the channel quality and the group status is activated, perform unicast padding for the user if the number of currently available unicast users is greater than a predetermined reserved unicast threshold.

In an embodiment, the unicast padding module is further configured to, when it is determined that the user needs to pad unicast due to the channel quality and the group status is activated, perform unicast padding for the user if the number of currently available unicast users is less than or equal to a predetermined reserved unicast threshold, the number of users with potential unicast demands is less than the reserved unicast threshold, and the user supports channel preemption.

In one embodiment, the channel quality includes reference signal received power, RSRP, signal to interference plus noise ratio, SINR, and multicast channel packet loss ratio;

the determining module is further configured to determine that the user needs to complement unicast due to channel quality reasons when the RSRP gradually decreases and the SINR gradually decreases within a predetermined time, and set the user as a user with a potential unicast demand; when the RSRP jitter exceeds the RSRP jitter threshold value in the preset time, determining that the user needs to build a unicast due to the channel quality, and setting the user as a user with potential unicast requirements; when the SINR jitter exceeds an SINR jitter threshold value in preset time, determining that the user needs to build a unicast due to the channel quality, and setting the user as a user with potential unicast requirements; and when the packet loss rate of the multicast channel exceeds a packet loss rate threshold value within a preset time, determining that the user needs to build a unicast due to the channel quality, and setting the user as a user with potential unicast requirements.

A unicast complementary establishment device of a 3GPP multicast scene comprises a processor and a memory;

the memory stores an application program executable by the processor, and the application program is used for causing the processor to execute the unicast padding method of the 3GPP multicast scenario described in any one of the above.

A computer readable storage medium having stored therein computer readable instructions for performing a unicast padding method of a 3GPP multicast scenario as described in any one of the above.

It can be seen from the above technical solutions that, in the embodiment of the present invention, a measurement report sent by a user is received, where the measurement report includes channel quality and a group state; when the user is determined to need to build a unicast due to the channel quality and the group state is activated, if the number of the current available unicast users is smaller than or equal to a preset reserved unicast threshold value, the number of users with potential unicast requirements is larger than or equal to a reserved unicast threshold value and the user supports channel preemption, a built unicast user with the channel quality optimal to the channel quality of the user is determined from a user list of the built unicast; and preempting the unicast channel of the complemented unicast user to execute unicast complementation for the user. Therefore, the embodiment of the invention can determine whether to allow to build the unicast according to the channel capacity, the user preemption capacity and the available unicast resource of the cell, and the user with poor signal can obtain the compensation opportunity preferentially.

In addition, the embodiment of the invention can also prejudge the potential unicast demand of the terminal according to the channel quality.

Drawings

Fig. 1 is a flowchart of a unicast padding method for a 3GPP multicast scenario according to an embodiment of the present invention.

Fig. 2 is a first flowchart of measurement and reporting at the end-user side according to an embodiment of the present invention.

Fig. 3 is a second flowchart of measurement and reporting at the end-user side according to an embodiment of the present invention.

Fig. 4 is a flowchart of a process after a base station receives a measurement report according to an embodiment of the present invention.

Fig. 5 is a flowchart of a unicast padding decision at the base station side according to an embodiment of the present invention.

Fig. 6 is a block diagram of a unicast padding apparatus in a 3GPP multicast scenario according to an embodiment of the present invention.

Fig. 7 is a block diagram of a unicast padding apparatus of a 3GPP multicast scenario with a memory-processor architecture according to an 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 is further described in detail with reference to the accompanying drawings.

For simplicity and clarity of description, the invention will be described below by describing several representative embodiments. Numerous details of the embodiments are set forth to provide an understanding of the principles of the invention. It will be apparent, however, that the invention may be practiced without these specific details. Some embodiments are not described in detail, but rather are merely provided as frameworks, in order to avoid unnecessarily obscuring aspects of the invention. Hereinafter, "comprising" means "including but not limited to", "according to … …" means "at least according to … …, but not limited to … … only". In view of the language convention for chinese, the following description, when not specifically referring to the number of a component, means that the component may be one or more than one, or may be understood as at least one.

First, the following concept is clarified. Unicast: if a unicast mode is adopted in the IP network, an information source (source) needs to establish an independent information transmission channel with each host (Receiver) that needs information, and send an independent information copy for each Receiver. Multicast: in the multicast mode, a multicast Source (Source) only needs to send a piece of information, a multicast distribution tree is established by means of a multicast routing protocol, and the transmitted information is copied and distributed at a network node which is as far as possible away from the multicast Source. The multicast solves the problem of realizing single-point transmission and multi-point reception with minimum network overhead. Compared with a unicast protocol, the multicast has no error correction mechanism, is difficult to make up after packet loss and packet error occur, and can build a unicast for multicast users with poor quality.

The applicant found that: for a 3GPP multicast scene, when multiple users gather or the load is high, the number of users in a cell is limited, and a large number of users cannot be supported to establish unicast. If the existing principle that a group unicast user is complemented first-come first-get is followed, when the number of unicast users of an activated group is high in demand and the number of cell users is full, a scenario that users with poor signals (for example, the worst) cannot get a compensation opportunity exists.

The applicant has also found that: the reasons for the above technical problems are: the quality of the group channel may be degraded due to various radio environments, cell load, interference level, and the difference in signal capability of the user at different locations. Due to the dynamic change of the factors, the service layer cannot directly sense the change, and unicast complementation or deletion adjustment among users cannot be dynamically and cooperatively performed.

In the embodiment of the invention, aiming at the defects in the prior art that the user with poor signal can not obtain unicast compensation opportunity in the scene of high load of a 3GPP cell or full user number, the terminal reports the channel quality, the system side performs resource reservation and ensures that the user with poor channel quality preferentially performs unicast construction.

In the embodiment of the invention, the terminal side reports the information of the current multicast service state, the channel state, the cell position and the like to the system side. And the system side performs unicast resource reservation for users with poor signal quality but without triggering unicast. And the system side application layer faces to a cell level and performs cell unicast user number resource management, unicast complementary establishment judgment, terminal mobility pre-judgment and terminal signal quality tracking.

Fig. 1 is a flowchart of a unicast padding method for a 3GPP multicast scenario according to an embodiment of the present invention. The method is applicable to the base station.

As shown in fig. 1, the method includes:

step 101: and receiving a measurement report sent by a user, wherein the measurement report comprises channel quality and group state.

Here, the user is a multicast user, and the channel quality is a multicast channel quality of the user, which may specifically include RSRP, SINR, and packet loss ratio of a multicast service. The group state comprises a group activation state and a group idle state, wherein when any group of the terminal user is activated, namely in the group activation state, the group state can be determined to be activated; otherwise, when the end user has no group activation, it may be deemed to be in a group idle state.

In one embodiment, the measurement report may further include a cell ID, and when the base station determines that the user has a cell change based on the cell ID, the base station determines that the user needs to complement unicast for a mobility reason, and sets the user as a user with a potential unicast demand.

In one embodiment, when the RSRP gradually decreases and the SINR gradually decreases within a predetermined time, the base station determines that a user needs to complement unicast for channel quality reasons, and sets the user as a user with potential unicast demand.

In one embodiment, when the RSRP jitter exceeds the RSRP jitter threshold value within a preset time, the base station determines that the user needs to complement unicast for the reason of channel quality, and sets the user as a user with potential unicast demand.

In one embodiment, when the SINR jitter exceeds the SINR jitter threshold within a predetermined time, the base station determines that the user needs to complement unicast for channel quality reasons, and sets the user as a user with potential unicast demand.

The base station directly builds the unicast for the multicast user aiming at the multicast user needing to build the unicast due to the mobility. For a multicast user that needs to build a unicast due to channel quality, whether to build a unicast for the multicast user needs to be determined, and a determination principle will be described in detail later.

Preferably, the terminal may send the measurement report to the base station through an option message.

Step 102: when it is determined that a user needs to make up unicast due to channel quality and the group state is activated, if the number of current available unicast users is less than or equal to a preset reserved unicast threshold, the number of users with potential unicast requirements is greater than or equal to the reserved unicast threshold and the user supports channel preemption, a made-up unicast user with channel quality most superior to that of the user is determined from a user list of made-up unicast, that is, a made-up unicast user with multicast channel quality most superior to that of the user is determined from a user list of made-up unicast.

Here, when the base station determines that the user needs to make up unicast due to channel quality and the group status is activated, if the number of current available unicast users of the base station is less than or equal to a predetermined reserved unicast threshold, the number of users with potential unicast demands is greater than or equal to the reserved unicast threshold, and the user supports channel preemption, a made-up unicast user with channel quality that is the best superior to the channel quality of the user is determined from the user list of made-up unicast, that is, a made-up unicast user with multicast channel quality that is the best superior to the multicast channel quality of the user is determined from the user list of made-up unicast.

Step 103: and preempting the unicast channel of the complemented unicast user to execute unicast complementation for the user.

In one embodiment, the method further comprises:

Fig. 2 is a first flowchart of measurement and reporting at the end-user side according to an embodiment of the present invention. Fig. 3 is a second flowchart of measurement and reporting at the end-user side according to an embodiment of the present invention.

It can be seen that, when the terminal is powered on or re-enters the network or roams, the first event report is triggered, and at this time, a measurement report including channel quality and group state is reported to the base station, and the measurement report preferably further includes the current cell ID.

Moreover, when the terminal performs cell switching or group establishment/release, event reporting may be triggered. Similarly, the uplink report includes the measurement report of the channel quality and the group status, and the measurement report preferably further includes the current cell ID.

In addition, the terminal can start periodic measurement and periodic measurement reporting of the channel quality. And reporting the measurement report when the measurement period is met. Similarly, the uplink report includes the measurement report of the channel quality and the group status, and the measurement report preferably further includes the current cell ID.

The channel quality may include RSRP, SINR, and multicast channel packet loss ratio. The filtering smoothing strategy of the channel quality can adopt classical alpha filtering or other filtering modes, and the embodiment of the invention does not limit the filtering and measuring modes. The group state includes a group active state and a group idle state, wherein when any group of the end user is active, the group is in the group active state, and the group state can be determined to be active; otherwise, when the end user has no group activation, it may be considered to be in a group idle state.

The base station records the measurement report of the terminal and executes corresponding processing.

As can be seen from fig. 4, for the measurement report triggered by the event report, the base station establishes or updates a cell/terminal list, records the number of users in the current cell, the user list, and the channel state of each user, and counts the number of users in the current connection in the cell, the number of users in the group-complementary unicast, and the number of terminals in the group activation state in real time. The unicast requirement pre-judgment is carried out on the terminals in the group activation state:

(1) if the RSRP is weaker and the SINR is weaker and weaker within a period of time, a unicast subsidy demand possibly exists in the movement trend towards a far point, and the terminal is identified as a potential unicast user.

(2) If the RSRP or SINR shakes severely within a period of time and the shaking exceeds a preset shaking upper limit, the channel quality of the area of the terminal is unstable, a unicast subsidy demand possibly exists, and the terminal is identified as a potential unicast user.

(3) If the packet loss rate of the multicast channel exceeds the upper threshold value of the preset packet loss rate within a period of time, the channel quality of the area of the terminal is unstable, a unicast complementary requirement possibly exists, and the terminal is identified as a potential unicast user.

(4) If the RSRP or SINR jitter recovers, the jitter is lower than a preset jitter lower limit, or the RSRP and the SINR are better and better, the unicast appeal is reduced, or the packet loss rate of the multicast channel is lower than a lower threshold value of the packet loss rate, and the potential unicast user identification is eliminated. The "potential unicast user" identification is cleared.

And the base station counts and updates the number of potential unicast users and the number of complemented unicast users in the cell, and sorts or reorders the two types of users according to the signal quality.

Aiming at unicast complementary construction and preemption processing of a base station, the method has the following principles: based on mobility, unicast is always supplemented and is not allowed to be preempted; and judging whether the available resources in the cell and the user preemption attribute are determined to be supplemented or not based on the quality supplement.

Firstly, according to the 3GPP protocol specification, if the current user needs to perform unicast padding based on the reason of mobility, the unicast is directly padded.

In addition, if the current user needs to perform unicast complementary establishment based on other channel quality reasons, further performing channel comparison between users:

step 1: if the number of available unicast users in the cell is larger than the reserved unicast threshold, triggering normal unicast complementary construction based on the channel quality. And if the number of the available unicast users in the cell is less than or equal to the reserved unicast threshold, comparing the potential unicast users with the reserved unicast threshold. If m potential unicast users with channel quality lower than that of the current user exist, and m is smaller than the number of reserved unicast users, unicast complementary construction is triggered; otherwise, judging whether the current user supports the preemption. If the following step 2 is supported to be preempted, if not, the step is not completed.

Step 2: and if the current user supports the preemption and the number of the available unicasts in the cell is more than 0, directly building the unicasts. If the number of available unicasts in the cell is equal to 0, comparing the channel quality of the current user with the channel quality of the user in the list of the 'repaired unicasts' user: if n user channel SINRs in the list are better than the current user channel SINR and the SINR difference is greater than an SINR preemption threshold (Thred _ Sinr), triggering preemption; releasing the user unicast channel and building unicast for the current user; if a plurality of users meeting the conditions exist, releasing the user with the best channel SINR; and if no user meeting the condition exists, the user is not built.

Wherein: "number of available unicast users": the number of idle unicast users in a cell; "reserved unicast threshold": parameter configuration, namely setting a threshold of the number of reserved unicast users according to channel resources and cell capacity; "potential unicast users": based on the channel quality judgment, users which have unicast requirements but have not triggered unicast complementary requests may exist; "complemented unicast user": in the cell, because of the channel quality, the unicast users are built; the user preempts the attribute: and (5) parameter configuration. This attribute may be configured for VIP users, high priority users, or special users as desired.

As can be seen from fig. 5, the base station makes a decision according to the unicast complement trigger reason and the potential unicast user number.

As can be seen from fig. 5: if the cell is triggered by the mobility, directly building the unicast, and updating the number of the available unicast users in the cell.

If the trigger is channel quality trigger, then:

step (1): and if the number of the available unicast users in the cell is greater than the reserved unicast threshold, directly building unicast and updating the number of the available unicast users in the cell. Otherwise, executing step (2)

Step (2): and in the potential unicast user list, counting the potential user number m with the channel quality worse than that of the current user. If m is smaller than the reserved unicast threshold, directly building a unicast; otherwise, executing step (3)

And (3): and judging the property of user preemption, and if the user supports preemption and the number of available unicasts is more than 0, directly supplementing. Otherwise, counting the number n of users with channel quality higher than the difference between the current user channel quality and the Thred _ sinr (the current user channel quality-Thred _ sinr) in the complemented unicast list, wherein n is larger than 0, directly complementing the unicast, and updating the number of the available unicast users in the cell, otherwise, not complementing the number.

Fig. 6 is a block diagram of a unicast padding apparatus in a 3GPP multicast scenario according to an embodiment of the present invention. The device is suitable for the base station.

As shown in fig. 6, the apparatus includes:

a receiving module 601, configured to receive a measurement report sent by a user, where the measurement report includes channel quality and a group status;

a determining module 602, configured to, when it is determined that the user needs to make up unicast due to channel quality and the group status is activated, determine, from a list of users who have made up unicast, a made-up unicast user whose channel quality is most superior to the channel quality of the user if the number of currently available unicast users is less than or equal to a predetermined reserved unicast threshold, the number of users with potential unicast demands is greater than or equal to the reserved unicast threshold, and the user supports channel preemption;

a unicast padding module 603, configured to preempt the unicast channel of the padded unicast user to perform unicast padding for the user.

In one embodiment, the unicast padding module 603 is further configured to perform unicast padding for the user when it is determined that the user needs to padding unicast for mobility reasons and the group status is activated.

In an embodiment, the unicast padding module 603 is further configured to, when it is determined that the user needs to pad unicast due to the channel quality and the group status is activated, perform unicast padding for the user if the current number of available unicast users is greater than a predetermined reserved unicast threshold.

In an embodiment, the unicast padding module 603 is further configured to, when it is determined that the user needs to pad unicast due to the channel quality and the group status is activated, perform unicast padding for the user if the number of currently available unicast users is less than or equal to a predetermined reserved unicast threshold, the number of users with potential unicast demands is less than the reserved unicast threshold, and the user supports channel preemption.

a determining module 602, further configured to determine that the user needs to complement unicast due to channel quality when RSRP gradually decreases and SINR gradually decreases within a predetermined time, and set the user as a user with potential unicast demand; when the RSRP jitter exceeds the RSRP jitter threshold value in the preset time, determining that the user needs to build a unicast due to the channel quality, and setting the user as a user with potential unicast requirements; when the SINR jitter exceeds an SINR jitter threshold value in preset time, determining that the user needs to build a unicast due to the channel quality, and setting the user as a user with potential unicast requirements; and when the packet loss rate of the multicast channel exceeds a packet loss rate threshold value within a preset time, determining that the user needs to build a unicast due to the channel quality, and setting the user as a user with potential unicast requirements.

As shown in fig. 7, the unicast padding apparatus for a 3GPP multicast scenario with a memory-processor architecture includes: a processor 701 and a memory 702; in which a memory 702 stores an application program executable by the processor 701 for causing the processor 701 to execute the unicast padding method of the 3GPP multicast scenario as described in any one of the above.

The memory 702 may be embodied as various storage media such as an Electrically Erasable Programmable Read Only Memory (EEPROM), a Flash memory (Flash memory), and a Programmable Read Only Memory (PROM). The processor 701 may be implemented to include one or more central processors or one or more field programmable gate arrays, wherein the field programmable gate arrays integrate one or more central processor cores. In particular, the central processor or central processor core may be implemented as a CPU or MCU.

It should be noted that not all steps and modules in the above flows and structures are necessary, and some steps or modules may be omitted according to actual needs. The execution order of the steps is not fixed and can be adjusted as required. The division of each module is only for convenience of describing adopted functional division, and in actual implementation, one module may be divided into multiple modules, and the functions of multiple modules may also be implemented by the same module, and these modules may be located in the same device or in different devices.

The hardware modules in the various embodiments may be implemented mechanically or electronically. For example, a hardware module may include a specially designed permanent circuit or logic device (e.g., a special purpose processor such as an FPGA or ASIC) for performing specific operations. A hardware module may also include programmable logic devices or circuits (e.g., including a general-purpose processor or other programmable processor) that are temporarily configured by software to perform certain operations. The implementation of the hardware module in a mechanical manner, or in a dedicated permanent circuit, or in a temporarily configured circuit (e.g., configured by software), may be determined based on cost and time considerations.

The present invention also provides a machine-readable storage medium storing instructions for causing a machine to perform a method as described herein. Specifically, a system or an apparatus equipped with a storage medium on which a software program code that realizes the functions of any of the embodiments described above is stored may be provided, and a computer (or a CPU or MPU) of the system or the apparatus is caused to read out and execute the program code stored in the storage medium. Further, part or all of the actual operations may be performed by an operating system or the like operating on the computer by instructions based on the program code. The functions of any of the above-described embodiments may also be implemented by writing the program code read out from the storage medium to a memory provided in an expansion board inserted into the computer or to a memory provided in an expansion unit connected to the computer, and then causing a CPU or the like mounted on the expansion board or the expansion unit to perform part or all of the actual operations based on the instructions of the program code.

Examples of the storage medium for supplying the program code include floppy disks, hard disks, magneto-optical disks, optical disks (e.g., CD-ROMs, CD-R, CD-RWs, DVD-ROMs, DVD-RAMs, DVD-RWs, DVD + RWs), magnetic tapes, nonvolatile memory cards, and ROMs. Alternatively, the program code may be downloaded from a server computer or the cloud by a communication network.

"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative. For the sake of simplicity, the drawings are only schematic representations of the parts relevant to the invention, and do not represent the actual structure of the product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "a" does not mean that the number of the relevant portions of the present invention is limited to "only one", and "a" does not mean that the number of the relevant portions of the present invention "more than one" is excluded. In this document, "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are used only to indicate relative positional relationships between relevant portions, and do not limit absolute positions of the relevant portions.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A unicast complementary construction method of a 3GPP multicast scene is characterized in that the method is applied to a base station, and the method comprises the following steps:

when the user is determined to need to build a unicast due to channel quality and the group state is activated, if the number of the current available unicast users is smaller than or equal to a preset reserved unicast threshold value, the number of users with potential unicast requirements is larger than or equal to the reserved unicast threshold value and the user supports channel occupation, a built unicast user with the multicast channel quality which is most superior to the multicast channel quality of the user is determined from a user list of the built unicast;

and preempting the unicast channel of the complemented unicast user to execute unicast complementation for the user.

2. The unicast padding method for 3GPP multicast scenario according to claim 1, characterized in that the method further comprises:

3. The unicast padding method for 3GPP multicast scenario according to claim 1, characterized in that the method further comprises:

4. The unicast padding method for 3GPP multicast scenario according to claim 1, characterized in that the method further comprises:

5. The unicast padding method for 3GPP multicast scenario according to claim 1, wherein the channel quality includes reference signal received power RSRP, signal to interference plus noise ratio SINR, and multicast channel packet loss ratio; the method further comprises the following steps:

6. A unicast complementary construction device of a 3GPP multicast scene is characterized in that the device is suitable for a base station, and the device comprises:

a determining module, configured to determine, when it is determined that the user needs to make up unicast due to channel quality and the group status is activated, a supplemented unicast user whose multicast channel quality is most superior to the multicast channel quality of the user from a user list of the supplemented unicast if the number of currently available unicast users is less than or equal to a predetermined reserved unicast threshold, the number of users with potential unicast requirements is greater than or equal to the reserved unicast threshold, and the user supports channel preemption;

7. The apparatus of claim 6, wherein,

and the unicast complementing module is also used for executing unicast complementing for the user when the user is determined to require complementing unicast for the reason of mobility and the group state is activated.

8. The apparatus of claim 6, wherein,

and the unicast rebuilding module is further used for executing unicast rebuilding for the user if the number of the current available unicast users is greater than a preset reserved unicast threshold value when the user is determined to need to rebuild unicast due to the channel quality and the group state is activated.

9. The apparatus of claim 6, wherein,

and the unicast rebuilding module is further used for executing unicast rebuilding for the user if the number of the current available unicast users is less than or equal to a preset reserved unicast threshold value, the number of users with potential unicast demands is less than the reserved unicast threshold value and the user supports channel preemption when the user is determined to need to rebuild unicast due to channel quality and the group state is activated.

10. The unicast padding apparatus for 3GPP multicast scenario according to claim 6, wherein the channel quality includes reference signal received power RSRP, signal to interference plus noise ratio SINR, and multicast channel packet loss ratio;

11. A unicast complementary construction device of a 3GPP multicast scene is characterized by comprising a processor and a memory;

the memory stores an application program executable by the processor for causing the processor to execute the unicast padding method of the 3GPP multicast scenario according to any one of claims 1 to 5.

12. A computer readable storage medium having stored therein computer readable instructions for performing a unicast padding method for a 3GPP multicast scenario according to any of claims 1 to 5.