CN101742409B - Method, system and device for realizing multicast broadcast MBS service synchronization of multi-hop system - Google Patents

Abstract

The invention discloses a method, a system and equipment for realizing the synchronization of a multicast/broadcast service (MBS) of a multi-hop system, which belong to the field of communication. In the multi-hop system of a plurality of cells, the method comprises the following steps: acquiring a maximum processing delay of the cells by base stations of each cell; reporting the acquired maximum processing delay to an MBS gateway; receiving an MBS transmitting time transmitted by the MBS gateway; and transmitting an MBS data packet to each of relay branches of the base stations according to the MBS transmitting time. The system comprises the MBS gateway, the base stations and the relay branches. The equipment comprises the MBS gateway, the base stations and a relay. The method, the system and the equipment fully take the processing delays of each cell into consideration, thereby ensuring that the MBS data packet can be prepared in advance when the MBS of each stage of stations are initiated, enabling the MBS data packet to be transmitted successfully, and realizing transmitting the MBS data packet to a user synchronously.

Description

Method, system and device for realizing multicast broadcast MBS service synchronization of multi-hop system

technical field

The invention relates to the communication field, in particular to a method, a system and a device for realizing synchronization of multicast broadcast MBS services of a multi-hop system.

Background technique

MBS (Multi-cast Broadcast Service, multicast broadcast service) is a practical technology to improve the efficiency of spectrum use, widely used in 3G (3rd Generation, third-generation digital communication) systems, and in TD-SCDMA (TimeDivision Synchronous Code Division Multiple Access, Time Division Synchronous Code Division Multiple Access) system and WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access) system have also begun to be applied, in the future 4G (4th Generation, fourth generation digital communication) In the system, such as LTE+ (Long Term Evolution+, long-term evolution technology+) will also be applied on a large scale.

For the MBS service, since its service is a multicast broadcast service, the MBS service must send data packets at the same time, that is, must ensure synchronization, so as to ensure that its users can receive messages at the same time, so as to achieve the effect of broadcast and multicast.

At present, MBS service synchronization can be realized under a traditional cellular communication system, that is, a solution for MBS service synchronization of multiple cells in a single-hop system. The so-called single-hop system refers to a system that does not include a relay RS (Relay Station). Referring to Figure 1, the cellular communication system that realizes MBS service synchronization includes: terminal user UE, base station eNB (ehanced NodeB, enhanced broadcast base station) of each cell, MBS gateway (Multi-cast Broadcast Service gateway, multicast broadcast gateway) and base station BS .

In order to transmit the MBS service in the cellular communication system, the eNBs of the relevant cells must be frame-synchronized, otherwise the MBS service will not be realized. The specific frame synchronization method does not belong to the solution scope of this solution. For example, TD-SCDMA utilizes GPS (Global Positioning System, Global Positioning System) synchronization, which is a synchronization system originally and does not require additional re-synchronization. On the basis of the frame synchronization, the E-MBS gateway notifies each eNB of the sending time of the MBS service data packet, such as the frame number, etc. on the basis of considering the transmission delay of the MBS service data packet arriving at each eNB site.

After analyzing the existing technology, the inventor found that: the determination of the system frame number synchronization of the current cellular communication system is only determined on the basis of the frame synchronization of each eNB, without considering its multi-hop characteristics, therefore, the following may occur Problem: When the eNB receives the MBS service data packet and knows the system frame number of the MBS service data packet it will send, if the eNB receives the MBS service data packet and sends the system frame number of the MBS service data packet, the time interval between If it is less than the time interval from receiving the MBS service data packet to forwarding the MBS data packet to other lower-level stations by the eNB, it will cause the failure of sending the data packet. For example, the system frame number of the eNB receiving the MBS service data packet is 8, and the system frame number of the MBS service data packet to be sent is 9, then the distance between the eNB receiving the MBS service data packet and the system frame number of sending the MBS service data packet The time interval is 1; if the system frame number of the eNB forwarding the MBS data packet to other lower-level stations is 10, then the time interval from eNB receiving the MBS service data packet to forwarding the MBS data packet to other lower-level stations is 2; at this time , the MBS service data packet is sent at the same time when the system frame number is 9, and the station under the eNB can only receive the data packet when the system frame number is 10. , to send the MBS service data packet, resulting in failure to send the MBS data packet.

Contents of the invention

In order to realize synchronous sending of MBS data packets to users and achieve the effect of broadcasting and multicasting, the present invention provides a method, system and equipment for realizing synchronization of multicasting and broadcasting MBS services in a multi-hop system.

The present invention provides a method for synchronizing multicast broadcast MBS services in a multi-hop system. In a multi-hop system with multiple cells, the method includes:

The base station of each cell obtains the maximum processing delay of each cell; wherein, the maximum processing delay of the cell is the processing delay of the relay branch with the largest processing delay among the relay branches under the cell;

Report the maximum processing delay obtained by each base station to the MBS gateway;

Receive the MBS service sending time issued by the MBS gateway; wherein, the MBS service sending time is obtained by the MBS gateway according to the maximum processing delay reported by each base station and the transmission delay from the MBS gateway to the base station;

According to the sending time of the MBS service, send the MBS service data packet;

The MBS service sending time is obtained by the MBS gateway according to the maximum processing delay reported by each base station and the transmission delay from the MBS gateway to the base station, including:

According to the maximum processing delay reported by each base station, a delay set is formed;

Select the maximum value among the maximum processing delay reported by each base station in the delay set;

Summing the maximum value in the delay set and the transmission delay from the MBS gateway to the base station;

The sum of the maximum value in the delay set and the transmission delay from the MBS gateway to the base station is taken as the minimum value of the MBS service sending time.

Correspondingly,

Each relay on each relay branch of the base station reports its own processing delay to the base station;

The relay obtains the MBS service sending time and the MBS service data packet; wherein, the MBS service sending time is obtained by the MBS gateway according to the maximum processing delay of each relay branch reported by each base station and the transmission delay from the MBS gateway to the base station;

The relay sends the MBS service data packet to the user according to the MBS service sending time and its own processing delay;

The MBS service sending time is obtained by the MBS gateway according to the maximum processing delay of each relay branch reported by each base station and the transmission delay from the MBS gateway to the base station, including:

According to the maximum processing delay of each relay branch reported by each base station, a delay set is formed;

Select the maximum value among the maximum processing delays of each relay branch reported by each base station in the delay set;

Summing the maximum value in the delay set and the transmission delay from the MBS gateway to the base station;

The sum of the maximum value in the delay set and the transmission delay from the MBS gateway to the base station is taken as the minimum value of the MBS service sending time.

The present invention also provides a system for synchronizing multicast and broadcast MBS services in a multi-hop system. The system includes: an MBS gateway, a base station, and a relay branch; wherein, there are multiple base stations;

The MBS gateway is used to receive the maximum processing delay reported by each base station; obtain the MBS service sending time according to the maximum processing delay reported by each base station and the transmission delay from the MBS gateway to the base station; send the MBS service sending time to each base station ;

The base station is used to obtain the maximum processing delay of the cell; report the obtained maximum processing delay to the MBS gateway; receive the MBS service sending time issued by the MBS gateway; send the MBS service data packet to the relay branch according to the MBS service sending time road;

The relay branch is used to receive the MBS service data packet and the MBS service sending time sent by the base station; send the MBS service data packet to the user according to the MBS service sending time;

According to the maximum processing delay reported by each base station and the transmission delay from the MBS gateway to the base station, the sending time of the MBS service is obtained, including:

According to the maximum processing delay reported by each base station, a delay set is formed;

Select the maximum value among the maximum processing delay reported by each base station in the delay set;

Summing the maximum value in the delayed set and the transmission delay from the MBS gateway to the base station;

The sum of the maximum value in the delay set and the transmission delay from the MBS gateway to the base station is taken as the minimum value of the MBS service sending time.

The present invention also provides an MBS gateway device. The MBS gateway device includes: a determination module and a delivery module, wherein,

The determination module is configured to receive the maximum processing delay reported by each base station; form a delay set according to the maximum processing delay reported by each base station; obtain the maximum value in the delay set; The transmission delay is used to obtain the sending time of the MBS service;

A sending module, configured to send the sending time of the MBS service obtained by the determining module to the base station;

According to the obtained maximum value and the transmission delay from the MBS gateway to the base station, the sending time of the MBS service is obtained, specifically including:

Summing the maximum value in the delay set and the transmission delay from the MBS gateway to the base station;

The sum of the maximum value in the delay set and the transmission delay from the MBS gateway to the base station is taken as the minimum value of the MBS service sending time.

The present invention also provides a base station, the base station includes: an acquisition module, a reporting module, a receiving module and a processing module, wherein,

An acquisition module, configured to acquire the maximum processing delay of the cell;

A reporting module, configured to report the maximum processing delay obtained by the obtaining module to the MBS gateway;

The receiving module is used to receive the MBS service sending time issued by the sending module of the MBS gateway; wherein, the MBS service sending time is obtained by the MBS gateway according to the maximum processing delay reported by each base station and the transmission delay from the MBS gateway to the base station;

The processing module is used to send the MBS service data packet to the relay branch according to the MBS service sending time received by the receiving module;

The MBS service sending time is obtained by the MBS gateway according to the maximum processing delay reported by each base station and the transmission delay from the MBS gateway to the base station, including:

According to the maximum processing delay reported by each base station, a delay set is formed;

Select the maximum value among the maximum processing delay reported by each base station in the delay set;

Summing the maximum value in the delay set and the transmission delay from the MBS gateway to the base station;

The sum of the maximum value in the delay set and the transmission delay from the MBS gateway to the base station is taken as the minimum value of the MBS service sending time.

The present invention also provides a relay, and the relay includes: a reporting module, an obtaining module and a sending module, wherein,

A reporting module, configured to report its own processing delay to the base station;

The obtaining module is used to receive the MBS service data packet and the MBS service sending time sent by the base station, wherein the MBS service sending time is the maximum processing delay of each relay branch reported by the MBS gateway according to each base station and the transmission from the MBS gateway to the base station delay to get;

The sending module sends the MBS service data packet to the user according to the MBS service sending time;

The MBS service sending time is obtained by the MBS gateway according to the maximum processing delay of each relay branch reported by each base station and the transmission delay from the MBS gateway to the base station, including:

According to the maximum processing delay of each relay branch reported by each base station, a delay set is formed;

Select the maximum value among the maximum processing delay reported by each base station in the delay set;

Summing the maximum value in the delay set and the transmission delay from the MBS gateway to the base station;

The sum of the maximum value in the delay set and the transmission delay from the MBS gateway to the base station is taken as the minimum value of the MBS service sending time.

The beneficial effects of the technical solution provided by the embodiments of the present invention are:

On the basis of ensuring the synchronization of all levels of sites in each cell, the embodiment of the present invention fully considers the processing delay of each cell by reporting the maximum processing delay of each cell to the MBS gateway, so as to ensure that the MBS services of all levels of sites are initiated The MBS data packet can be prepared in advance, so that the MBS service data packet can be sent successfully, realizing the synchronization of sending the MBS data packet to the user, and achieving the effect of broadcasting and multicasting.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

Fig. 1 is a schematic structural diagram of a prior art cellular communication system;

FIG. 2 is a schematic structural diagram of a method for realizing MBS service synchronization of a multi-hop system provided by Embodiment 1 of the present invention;

FIG. 3 is a schematic diagram of a specific implementation process of a method for realizing MBS service synchronization of a multi-hop system provided by Embodiment 1 of the present invention;

FIG. 4 is a schematic structural diagram of a method for realizing MBS service synchronization of a multi-hop system provided by Embodiment 2 of the present invention;

FIG. 5 is a schematic diagram of a specific implementation flow of a method for realizing MBS service synchronization of a multi-hop system provided by Embodiment 2 of the present invention;

FIG. 6 is a schematic diagram of a system for realizing MBS service synchronization of a multi-hop system provided by Embodiment 3 of the present invention;

FIG. 7 is a schematic diagram of an MBS gateway device for realizing MBS service synchronization of a multi-hop system provided by Embodiment 4 of the present invention;

FIG. 8 is a schematic diagram of a base station for realizing MBS service synchronization of a multi-hop system provided by Embodiment 5 of the present invention;

FIG. 9 is a schematic diagram of a relay for implementing MBS service synchronization of a multi-hop system according to Embodiment 6 of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The present invention is aimed at the current solution for the single-hop system, which only solves the synchronization of the MBS services of the eNB sites between the cells, and cannot guarantee the synchronization of the MBS services of the entire MBS cell of each lower-level site and its upper-level site in the multi-hop system. Taking into account the MBS service synchronization between the cells of the multi-hop system and with each lower-level site, a method for realizing the synchronization of the multicast broadcast MBS service of the multi-hop system is proposed. In a multi-cell multi-hop system, the content of the method is as follows :

The base station of each cell obtains the maximum processing delay of the cell; wherein, the maximum processing delay of the cell is the maximum value of the processing delay in each relay branch under the cell;

Reporting the obtained maximum processing delay to the MBS gateway;

receiving the MBS service sending time issued by the MBS gateway; wherein, the MBS service sending time is obtained by the MBS gateway according to the maximum processing delay reported by each base station and the transmission delay from the MBS gateway to the base station;

Send the MBS service data packet to each relay branch of the base station according to the MBS service sending time.

Correspondingly, each relay branch of the base station reports its own processing delay to the base station;

The relay branch obtains the MBS service sending time and the MBS service data packet; wherein, the MBS service sending time is obtained by the MBS gateway according to the maximum processing delay of each relay branch reported by each base station and the transmission delay from the MBS gateway to the base station;

The relay branch sends the MBS service data packet to the user according to the MBS service sending time and its own processing delay.

In the method provided by the present invention, on the basis of ensuring the synchronization of all levels of stations in each community, each MR-BS (Multi Relay Base Station, base station of a multi-hop system) returns the maximum processing time of each community by returning to the Backhaul (backhaul link) mode. The delay is reported to the MBS gateway. After the MBS gateway obtains the maximum processing delay of the MBS cell, a delay set is formed. According to the maximum value of the delay set and the transmission delay from the MBS gateway to the base station, the sending time of the MBS service is obtained, and Notify each MR-BS so that before multicasting the MBS service data packets, the MBS service data packets have all arrived at each MR-BS and each relay under each MR-BS, ensuring that the MBS service data packets are sent successfully , to achieve the effect of broadcasting and multicasting. The technical solutions provided by the embodiments of the present invention will be described in detail below in conjunction with the following embodiments.

Example 1

The embodiment of the present invention provides a method for synchronizing multicast and broadcast MBS services in a multi-hop system. The method can ensure that all MBS data packets have arrived at each MR-BS and each intermediate station under each MR-BS before starting the MBS service. Following the RS, the successful transmission of the MBS service data packet is ensured, and the MBS service synchronization of each MR-BS in the entire MBS cell is realized.

For ease of description, the embodiment of the present invention takes a 2-hop system as an example to specifically describe how to realize the synchronization of MBS services of a multi-hop system in multiple cells. It is assumed that there are two MR-BSs in the entire MBS cell: MR-BS1 and MR-BS1. BS2, wherein, there is a relay RS1 under MR-BS1, and there is a relay RS2 under MR-BS2. See Figure 2. Both MR-BS1 and MR-BS2 are connected to the MBS gateway. There is a relay RS1 under MR-BS1, which directly connects to users; there is a relay RS2 under MR-BS2, which directly connects to users user. Referring to Figure 3, the specific implementation process is as follows:

101: MR-BS1 obtains the processing delay T1 of its subordinate relay RS1, and MR-BS2 obtains the processing delay T2 of its subordinate relay RS2. The specific implementation content is as follows:

Taking the processing delay T1 of MR-BS1 obtaining its subordinate relay RS1 as an example, the specific process of each MR-BS obtaining the processing delay of its subordinate relay RS is described in detail below:

First, the relay RS1 sends an SBC-REQ (SS Basic Capability Request) message to the base station MR-BS1 of the multi-hop system. The SBC-REQ message carries the basic capability parameters of the relay RS1, including the processing of the relay RS1. time delay T1;

Secondly, after receiving the SBC-REQ message, the base station MR-BS1 of the multi-hop system obtains the processing delay T1 in the SBC-REQ message, and sends an SBC-RSP (SS Basic Capability Response, basic capability response) message.

Among them, after the base station MR-BS1 of the multi-hop system receives the SBC-REQ, it compares the capability parameters according to the SBC-REQ, and includes the capability parameters supported by both parties in the SBC-RSP to inform the relay RS1 by unicast, and the relay RS1 analyzes the SBC-RSP, so as to determine the capability parameters that should be used in the subsequent communication process, here mainly refers to the processing delay parameters.

Through the above process, the base station MR-BS1 of the multi-hop system obtains the processing delay T1 of its subordinate relay RS1, so that before the base station of the multi-hop system starts the MBS service, MR-BS1 knows the processing time of its subordinate relay RS1 in advance delay. Similarly, MR-BS2 can also obtain the processing delay T2 of its subordinate relay RS2 through the above process.

102: MR-BS1 reports the obtained processing delay T1 of the relay RS1 to the MBS gateway, and MR-BS2 reports the obtained processing delay T2 of the relay RS2 to the MBS gateway.

Among them, after MR-BS1 obtains the processing delay T1 of its subordinate relay RS1, and MR-BS2 obtains the processing delay T2 of its subordinate relay RS2, MR-BS1 and MR-BS2 respectively return to the Backhaul (backhaul link ) to report the processing delays of the respective relays to the MBS gateway.

Backhaul (backhaul link) refers to the connection from the access network or cell site to the switching center. The switching center is connected to the backbone network, and the backbone network is connected to the core network. Thus, the backhaul link network is the middle layer of any telecommunication network structure, it sits between the access network and the backbone network, provides an important connection between these two networks, and helps service providers reduce the cost of backhaul transmission. In the embodiment of the present invention, Backhaul is specifically the connection from the base station MR-BS of the multi-hop system to the MBS gateway.

103: The MBS gateway forms a processing delay set consisting of T1 and T2 according to the obtained processing delay T1 of MR-BS1 and processing delay T2 of MR-BS2, and selects the maximum value Tmax in the processing delay set, and according to Tmax and The transmission time T of the MBS service is obtained from the transmission delay from the MBS gateway to the base station.

Refer to Table 1, the processing delay set consisting of processing delay T1 and processing delay T2 in the embodiment of the present invention. Wherein, if T1<T2, then Tmax=T2; otherwise, Tmax=T1. If T1 is 10 seconds and T2 is 8 seconds, then T1=Tmax.

Table 1

The base station MR-BS of the multi-hop system processing delay MR-BS1 T1 MR-BS2 T2

The MBS gateway adds the maximum value Tmax of the processing delay set and the transmission delay from the MBS gateway to the base station as the minimum value of the MBS service sending time T, that is, the MBS service sending time T is at least Tmax and the time delay from the MBS gateway to the base station The sum of the transmission delays, so as to ensure that all MBS data packets have arrived at all levels of stations before the stations at all levels start the MBS service, so as to ensure that the MBS data packets are sent successfully.

104: The MBS gateway issues the sending time T of the MBS service to MR-BS1 and MR-BS2 respectively.

105: MR-BS1 and MR-BS2 receive the MBS service sending time T, and send the MBS data packet and the MBS service sending time T to the relay RS1 and the relay RS2 respectively.

Wherein, after receiving the MBS service data packet, MR-BS1 sends the data packet to relay RS1 in advance according to the processing delay T1 of its subordinate relay RS1. After MR-BS1 receives T, it sends the MBS data packet to relay RS1 and carries the MBS service sending time T at the same time. Wherein, T can ensure that the MBS service can be sent synchronously between MR-BS cells. For example, if T is 10 seconds, then the message that Tmax is 10 seconds is carried when the MBS data packet is sent to the relay RS1, and the relay RS1 is notified to send the MBS data packet to the user after 10 seconds. Similarly, after receiving T, MR-BS2 sends an MBS data packet to relay RS2 and carries the MBS service sending time T at the same time.

106: After receiving the MBS data packets respectively, the relay RS1 and the relay RS2 wait until the MBS service sending time T, and then send the MBS data packets to their respective users.

Among them, because the processing capabilities of relay RS1 and relay RS2 are different, the processing delay is also different (the processing delay of relay RS1 is T1, and the processing delay of relay RS 2 is T2), requiring relay RS1 and relay RS2 sends the MBS data packet to the user at T, and T is greater than any one of T1 and T2, it will appear that a relay has processed the MBS data packet before T, and the relay needs to wait for a period of time to arrive The MBS data packet is sent to the user at the sending time T of the MBS service. For example:

Suppose the processing delay T1 of relay RS1 is 10 seconds, the processing delay T2 of relay RS2 is 8 seconds, then Tmax is 10 seconds; suppose the processing delay from MBS gateway to base station is 2 seconds, take T=Tmax+2 = 12 seconds. Then in 10 seconds, relay RS2 has processed the MBS data packet, but at this time, relay RS1 has not processed the MBS data packet, relay RS2 needs to wait for 2 seconds, and when T=12 seconds, send it simultaneously with relay RS1 The MBS data packet is sent to the user, which can ensure the success of sending the MBS data packet to the user, realizes the synchronization of sending the MBS data packet to the user, and achieves the effect of broadcasting and multicasting.

To sum up, the embodiment of the present invention, on the basis of ensuring the synchronization of all levels of sites in each cell, reports the maximum processing delay of the MR-BS to the MBS gateway, and the MBS gateway uses the maximum processing delay and the transmission delay from the MBS gateway to the base station , get the MBS service sending time and notify each MR-BS, fully consider the processing delay of each MR-BS, ensure the successful sending of MBS service data packets, realize the synchronization of sending MBS data packets to users, and achieve broadcast and multicast Effect.

Example 2

The embodiment of the present invention provides a method for synchronizing multicast and broadcast MBS services in a multi-hop system. In the embodiment of the present invention, there are two MR-BSs under the MBS cell: MR-BS1 and MR-BS2, wherein MR-BS1 There is a relay branch below, and the relay branch includes a relay RS1, there is a relay branch under MR-BS2, and there are two relay RS2 and RS3 in the branch as an example, the implementation of the present invention The method provided by the example is described in detail.

See Figure 4, both MR-BS1 and MR-BS2 are connected to the MBS gateway, MR-BS1 is connected to relay RS1, and relay RS1 is connected to users directly; MR-BS2 is connected to relay RS2, and relay RS2 is connected to relay RS3 , connect users under relay RS3. Referring to Figure 5, the specific implementation process is as follows:

201: MR-BS1 obtains the processing delay T1 of its subordinate relay RS1, and MR-BS2 obtains the total processing delay T2 of relay RS2 and relay RS3 in its subordinate relay branches. The specific implementation process is as follows:

Take the total processing delay T2 obtained by MR-BS2 for its subordinate relay RS2 and relay RS3 as an example for illustration:

First, relay RS2 and relay RS3 respectively send SBC-REQ messages to base station MR-BS2 of the multi-hop system. The SBC-REQ messages respectively carry the basic capability parameters of relay RS2 and relay RS3, including the processing of relay RS2. The time delay t1 and the processing time delay t2 of the relay RS3, then the total processing time delay of the relay branches under the 3-hop MR-BS2 is T2=t1+t2.

Secondly, after receiving the SBC-REQ messages of relay RS2 and relay RS3, the base station MR-BS2 of the multi-hop system obtains the processing delay t1 in the SBC-REQ message of relay RS2 and the SBC-REQ message of relay RS3 processing delay t2 in the message, and return the SBC-RSP message to relay RS2 and relay RS3 respectively according to the obtained processing delay t1 and t2.

Through the above process, the base station MR-BS2 of the 3-hop system obtains the total processing delay T2 of the relay RS2 and the relay RS3 of its lower relay branch, so that before starting the MBS service of the entire multi-hop system, MR-BS2 Know the processing delay of its subordinate relay branches. The process for MR-BS1 to obtain the processing time delay T1 of its subordinate relay RS1 is referred to in Embodiment 1, and will not be repeated here.

202: MR-BS1 reports the obtained processing delay T1 of the relay RS1 to the MBS gateway, and MR-BS2 reports the obtained processing delay T2 of the relay branch to the MBS gateway.

Among them, after MR-BS1 obtains the processing delay T1 of its subordinate relay RS1, and MR-BS 2 obtains the total processing delay T2 of its subordinate relay branch, MR-BS1 and MR-BS2 respectively return to Backhaul report their respective processing delays to the MBS gateway.

203: The MBS gateway forms a processing delay set consisting of T1 and T2 according to the acquired processing delay T1 of MR-BS1 and processing delay T2 of MR-BS2, and selects the maximum value Tmax in the processing delay set, and according to Tmax and The transmission time T of the MBS service is obtained from the transmission delay from the MBS gateway to the base station.

Wherein, since the relay RS3 is connected to the user under the MR-BS2, for realizing the MBS service of the MR-BS2, the relay RS3 sends the MBS data packet to the user.

Refer to Table 2, the processing delay set consisting of processing delay T1 and processing delay T2 in the embodiment of the present invention. Wherein, if T1<T2, then Tmax=T2; otherwise, Tmax=T1. If T1 is 10 seconds, t1 is 8 seconds, and t2 is 6 seconds, then T2 is 8+4=14 seconds, then Tmax=T2=14 seconds.

Table 2

The MBS gateway adds the maximum value Tmax of the processing delay set and the transmission delay from the MBS gateway to the base station as the minimum value of the MBS service sending time T, that is, the MBS service sending time T is at least Tmax and the time delay from the MBS gateway to the base station The sum of the transmission delays, so as to ensure that all MBS data packets have arrived at all levels of stations before the stations at all levels start the MBS service, so as to ensure that the MBS data packets are sent successfully.

204: The MBS gateway issues the sending time T of the MBS service to MR-BS1 and MR-BS2 respectively.

205: MR-BS1 and MR-BS2 receive the MBS service sending time T, and send the MBS data packet and the MBS service sending time T to their subordinate relay branches respectively.

Among them, after MR-BS1 receives T, it sends the MBS data packet to relay RS1 and carries the MBS service sending time T; after MR-BS2 receives T, it sends the MBS data packet to relay RS2 while carrying MBS The service sending time T; after the relay RS2 receives the MBS data packet and the MBS service sending time T, it continues to send the MBS data packet to the relay RS3 while carrying the MBS service sending time T.

206: After receiving the MBS data packet respectively, the relay RS1 and the relay RS3 send the MBS data packet to the user when the MBS service sending time T is reached.

Among them, due to the different processing capabilities of relay RS1, relay RS2 and relay RS3, the processing delays are also different (the processing delay of relay RS1 is T1, the processing delay of relay RS2 is t1, and the processing delay of relay RS3 The delay is t2), and relay RS1 and relay RS3 are required to send MBS data packets to users at T, and T is greater than any one of T1 and T2, and there will be all MR-BS relays processed before T After completing the MBS data packet, the relay of the MR-BS needs to wait for a period of time, and then send the MBS data packet to the user after T. For example:

Assume that the processing delay T1 of relay RS1 of MR-BS1 is 10 seconds, the processing delay t1 of relay RS2 of MR-BS2 is 8 seconds, and the processing delay t2 of relay RS3 of MR-BS2 is 6 seconds. - The total processing delay T2 of BS2 is 14 seconds, so Tmax is 14 seconds. Assuming that the transmission delay from the MBS gateway to the base station is 2 seconds, take T=Tmax+2=16 seconds. At 10 seconds, the relay RS2 of MR-BS2 has finished processing the MBS data packet, and sends the MBS data packet with T to the relay RS3, and the relay RS3 continues to process the MBS data packet; at 12 seconds, the relay RS2 of MR-BS1 The relay RS1 has processed the MBS data packet, but the relay RS3 has not processed the MBS data packet. At this time, the relay RS1 of MR-BS1 needs to wait for 4 seconds; when T=16 seconds, the relay RS3 of MR-BS2 processes After completing the MBS data packet, send the MBS data packet to the user, and at the same time, the relay RS1 of MR-BS1 also sends the MBS data packet to the user, which not only ensures that each relay sends the MBS data packet to the user successfully, but also realizes the sending of the MBS data packet Synchronization for users to achieve the effect of broadcasting and multicasting.

Further assume that the processing delay T1 of relay RS1 under MR-BS1 is 10 seconds, the processing delay t1 of relay RS2 under MR-BS2 is 6 seconds, and the processing delay t2 of relay RS 3 under MR-BS2 is 2 seconds , the total processing delay T2 of MR-BS2 is 8 seconds, then Tmax is 10 seconds; assuming that the transmission delay from the MBS gateway to the base station is 2 seconds, take T=Tmax+2=12 seconds. At 8 seconds, the relay RS2 of MR-BS2 has finished processing the MBS data packet. At this time, the relay RS2 sends the MBS data packet carrying T to the relay RS3. Among them, because the relay RS2 knows in advance that its subordinate relay RS3 processes The time for the MBS data packet is only 2 seconds, and T is 12 seconds. At this time, the relay RS2 can delay sending the MBS data packet and T to the relay RS3 for a period of time, but it must ensure that its subordinate relay RS 3 is within T =12 seconds, the MBS data packet is processed, that is, the delay time cannot exceed 2 seconds, so as to ensure that the relay RS3 can send the MBS data packet to the user when T=12 seconds. Of course, the relay RS2 can also send the MBS data packet carrying T to the relay RS3 immediately, and the relay RS3 finishes processing the MBS data packet in 10 seconds, and waits until T=12 seconds, and then communicates with the relay of MR-BS1 RS1 sends MBS data packets to the user together. This not only ensures that each relay successfully sends the MBS data packet to the user, but also realizes the synchronization of sending the MBS data packet to the user, achieving the effect of broadcasting and multicasting.

Embodiment 1 takes a 2-hop system in which there are two MR-BSs under the MBS cell, and each MR-BS has a relay RS as an example. In the embodiment of the present invention, there are two MR-BSs under the MBS cell, wherein, A 2-hop system with a relay RS under one MR-BS, and a relay branch under another MR-BS, and a 3-hop system including two relays in the relay branch are taken as an example. The method is described in detail. Those skilled in the art can know that the method provided by the embodiment of the present invention is also applicable when there are multiple (more than two) MR-BSs under the MBS cell, that is, multiple MR-BSs report their respective maximum processing delays To the MBS gateway, the MBS gateway obtains the MBS service transmission time according to the maximum processing delay reported by multiple MR-BSs and the transmission delay from the MBS gateway to the base station, and notifies each MR-BS under the MBS cell, fully considering multiple MR-BSs The processing delay of the BS realizes the synchronization of MBS services. Furthermore, the method provided by the embodiment of the present invention is also applicable to the situation where there is a user directly connected to a certain MR-BS among the multiple MR-BSs in the MBS cell. At this time, the MR-BS needs to wait until the MBS service transmission time T, Send MBS data packets to users simultaneously with other MR-BSs.

The method provided by the embodiment of the present invention is also applicable to the situation that the MR-BS includes multiple relay branches, and each relay branch has multiple relays. At this time, the MR-BS obtains the After the processing delay of the relay branch, the processing delay of the relay branch with the largest processing delay is selected and reported to the MBS gateway, and each relay branch waits until T, and sends the MBS data packet to the user; in addition, for a certain In the case that both the relay RS and the user are connected under the MR-BS, the MR-BS must wait until T (that is, the MBS service sending time) before it can send the MBS data packet to the user together with the relay RS connected to the user ;Similarly, it can be seen that for a relay RS under the MR-BS to connect to both the subordinate relay RS and the user, the relay RS will send the MBS data packet and T to its subordinate after processing the MBS data packet When the relay RS waits for T (that is, the sending time of the MBS service), it sends the MBS data packet to the user together with the relay RS connected to the user at the lower level, thereby realizing the synchronization of the MBS service.

To sum up, in the embodiment of the present invention, on the basis of ensuring the synchronization of all levels of sites in each MR-BS cell, the maximum processing delay of each MR-BS is reported to the MBS gateway, and the MBS gateway according to the maximum processing delay and the maximum processing delay from the MBS gateway to the base station The transmission delay of the MBS service is obtained, and each MR-BS is notified, and the processing delay of each MR-BS is fully considered, which ensures the successful transmission of the MBS service data packet and realizes the synchronization of sending the MBS data packet to the user. To achieve the effect of broadcasting and multicasting.

Example 3

An embodiment of the present invention provides a system for synchronizing multicast and broadcast MBS services in a multi-hop system. Referring to FIG. 6 , the system includes: an MBS gateway, a base station, and a relay branch; wherein, there are multiple base stations;

The MBS gateway is used to receive the maximum processing delay reported by each base station; obtain the MBS service sending time according to the maximum processing delay reported by each base station and the transmission delay from the MBS gateway to the base station; send the MBS service sending time to each base station ;

The base station is used to obtain the maximum processing delay of each cell; report the obtained maximum processing delay to the MBS gateway; receive the MBS service sending time issued by the MBS gateway; send the MBS service data packet to the relay according to the MBS service sending time Branch road;

The relay branch is used to receive the MBS service data packet and the MBS service sending time sent by the base station; and send the MBS service data packet to the user according to the MBS service sending time.

Further, there is at least one relay in the relay branch, wherein,

The relay branch is specifically used to obtain the waiting time for the relay to send the MBS service data packet to the user according to the MBS service sending time and the processing delay of the relay in the relay branch; The MBS service data packet is sent to the user according to the waiting time required for the acquisition.

To sum up, on the basis of ensuring the synchronization of all levels of stations in each MR-BS cell, the embodiment of the present invention fully considers the time delay of each MR-BS, ensures the successful transmission of MBS service data packets, and realizes the transmission of MBS data packets. Synchronization for users to achieve the effect of broadcasting and multicasting.

Example 4

An embodiment of the present invention provides an MBS gateway device. Referring to FIG. 7, the MBS gateway device includes: a determination module and a delivery module, wherein,

The determining module is configured to receive the maximum processing delay reported by each base station; form a delay set according to the maximum processing delay reported by each base station; acquire the maximum value in the delay set; and the transmission delay from the MBS gateway to the base station to obtain the sending time of the MBS service;

The sending module is configured to send the sending time of the MBS service obtained by the determining module to the base station.

To sum up, on the basis of ensuring the synchronization of all levels of stations in each MR-BS cell, the embodiment of the present invention fully considers the time delay of each MR-BS, ensures the successful transmission of MBS service data packets, and realizes the transmission of MBS data packets. Synchronization for users to achieve the effect of broadcasting and multicasting.

Example 5

An embodiment of the present invention provides a base station. Referring to FIG. 8, the base station includes: an acquisition module, a reporting module, a receiving module, and a processing module, wherein,

The obtaining module is used to obtain the maximum processing delay of the cell;

The reporting module is configured to report the maximum processing delay obtained by the obtaining module to the MBS gateway;

The receiving module is configured to receive the sending time of the MBS service sent by the sending module of the MBS gateway; wherein,

The MBS service sending time is obtained by the MBS gateway according to the maximum processing delay reported by each base station and the transmission delay from the MBS gateway to the base station;

The processing module is configured to send the MBS service data packet to a relay branch according to the MBS service sending time received by the receiving module.

Further, the acquisition module includes an acquisition unit, wherein,

The obtaining unit is configured to obtain the processing delay of each relay branch under the cell; according to the processing delay of each relay branch, obtain the maximum value of the processing delay to obtain the maximum processing delay of the cell delay.

Further, the reporting module includes a reporting unit, wherein,

The reporting unit reports the obtained maximum processing delay to the MBS gateway by returning the backhaul link.

To sum up, on the basis of ensuring the synchronization of all levels of stations in each MR-BS cell, the embodiment of the present invention fully considers the time delay of each MR-BS, ensures the successful transmission of MBS service data packets, and realizes the transmission of MBS data packets. Synchronization for users to achieve the effect of broadcasting and multicasting.

Example 6

An embodiment of the present invention provides a relay. Referring to FIG. 9, the relay includes: a reporting module, an obtaining module, and a sending module, wherein,

A reporting module, configured to report its own processing delay to the base station;

The obtaining module is used to receive the MBS service data packet and the MBS service sending time sent by the base station, wherein the MBS service sending time is the maximum processing delay of each relay branch reported by the MBS gateway according to each base station and the transmission from the MBS gateway to the base station delay to get;

The sending module sends the MBS service data packet to the user according to the sending time of the MBS service.

Further, there is at least one relay between the base station and the user, where,

The obtaining module is also used to obtain the waiting time for the relay to send the MBS service data packet to the user according to the MBS service sending time and the processing delay of the relay;

Correspondingly,

The sending module is also used to send the MBS service data packet to the user according to the waiting time obtained by the obtaining module.

It should be pointed out that the waiting time for each relay in a relay branch may be different, and the waiting time in the embodiment refers to receiving the MBS data packet for a certain period of time before sending it data pack. For example, when a trunk branch has three trunks RS1, RS2, and RS3, and the processing delays are t1, t2, and t3 respectively, assuming that the transmission delay from the MBS gateway to the base station is Td, and the sending time of the MBS service is T, then RS1 The time to wait is T-Td-t1, and the time to wait for RS2 may be T-Td-t1-t2, and different waiting times can be artificially set according to needs, so that the last one of all interrupted branches Relays are able to send MBS packets at the same time.

To sum up, on the basis of ensuring the synchronization of all levels of stations in each MR-BS cell, the embodiment of the present invention fully considers the time delay of each MR-BS, ensures the successful transmission of MBS service data packets, and realizes the transmission of MBS data packets. Synchronization for users to achieve the effect of broadcasting and multicasting.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in a computer-readable storage medium. , may include the flow of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM), etc.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention Inside.

Claims (14)

1. A method for realizing the synchronization of the multicast broadcast MBS service of the multi-hop system is characterized in that in the multi-hop system of a plurality of cells, the method comprises the following steps:

the base station of each cell acquires the maximum processing time delay of the cell; the maximum processing delay of the cell is the maximum value of the processing delays in each relay branch under the cell;

reporting the acquired maximum processing delay to an MBS gateway;

receiving MBS service sending time issued by the MBS gateway; the MBS service sending time is obtained by the MBS gateway according to the maximum processing time delay reported by each base station and the transmission time delay from the MBS gateway to the base station;

according to the MBS service sending time, sending the MBS service data packet to each relay branch of the base station;

the MBS service transmission time is obtained by the MBS gateway according to the maximum processing delay reported by each base station and the transmission delay from the MBS gateway to the base station, and specifically includes:

forming a time delay set according to the maximum processing time delay reported by each base station;

selecting the maximum value of the maximum processing time delay reported by each base station in the time delay set;

summing the maximum value of the time delay set and the transmission time delay from the MBS gateway to the base station;

and taking the sum of the maximum value of the time delay set and the transmission time delay from the MBS gateway to the base station as the minimum value of the MBS service sending time.

2. The method of claim 1, wherein the obtaining, by the base station of each cell, the maximum processing delay of the cell comprises:

the base station acquires the processing time delay of each relay branch under each cell;

and acquiring the processing time delay of the relay branch with the largest processing time delay according to the processing time delay of each relay branch to obtain the maximum processing time delay of the cell.

3. The method as claimed in claim 2, wherein the step of the base station acquiring the processing delay of each relay leg under each cell when there are multiple relays in the relay leg comprises:

the base station acquires basic capability request messages sent by each relay in the relay branch;

acquiring the processing time delay of each relay according to the basic capability request message sent by each relay in the relay branch;

and obtaining the processing time delay of the relay branch according to the processing time delay of each relay.

4. The method of claim 1, wherein the reporting the maximum processing delay obtained by each base station to an MBS gateway specifically includes:

and the base stations report the acquired maximum processing time delay to the MBS gateway through a return link.

5. A method for realizing the synchronization of the multicast broadcast MBS service of the multi-hop system is characterized in that in the multi-hop system of a plurality of cells, the method comprises the following steps:

each relay on each relay branch of the base station reports the self processing time delay to the base station;

the relay acquires MBS service sending time and MBS service data packets; the MBS service sending time is obtained by the MBS gateway according to the maximum processing time delay of each relay branch reported by each base station and the transmission time delay from the MBS gateway to the base station;

the relay sends the MBS service data packet to the user according to the MBS service sending time and the self processing time delay;

the MBS service transmission time is obtained by the MBS gateway according to the maximum processing delay of each relay branch reported by each base station and the transmission delay from the MBS gateway to the base station, and specifically includes:

forming a time delay set according to the maximum processing time delay of each relay branch reported by each base station;

selecting the maximum value of the maximum processing time delay of each relay branch reported by each base station in the time delay set;

summing the maximum value of the time delay set and the transmission time delay from the MBS gateway to the base station;

and taking the sum of the maximum value of the time delay set and the transmission time delay from the MBS gateway to the base station as the minimum value of the MBS service sending time.

6. The method of claim 5, wherein when there is at least one relay in the relay leg, the sending the MBS service packet to the user comprises:

acquiring the waiting time for the relay to send the MBS service data packet to the user according to the MBS service sending time and the processing time delay of the relay in the relay branch;

and the relay sends an MBS service data packet to the user according to the acquired waiting time.

7. A system for realizing the synchronization of the multicast broadcast MBS service of the multi-hop system is characterized in that the system comprises: MBS gateway, base station and relay branch; the number of the base stations is multiple;

the MBS gateway is used for receiving the maximum processing time delay reported by each base station; obtaining MBS service sending time according to the maximum processing time delay reported by each base station and the transmission time delay from the MBS gateway to the base station; sending the MBS service sending time to each base station;

the base station is used for acquiring the maximum processing time delay of the cell; reporting the obtained maximum processing time delay to the MBS gateway; receiving MBS service sending time issued by the MBS gateway; according to the MBS service sending time, sending the MBS service data packet to a relay branch;

the relay branch is used for receiving the MBS service data packet and the MBS service sending time sent by the base station; according to the MBS service sending time, sending the MBS service data packet to a user;

obtaining MBS service sending time according to the maximum processing time delay reported by each base station and the transmission time delay from the MBS gateway to the base station, which specifically comprises the following steps:

forming a time delay set according to the maximum processing time delay reported by each base station;

selecting the maximum value of the maximum processing time delay reported by each base station in the time delay set;

summing the maximum value of the time delay set and the transmission time delay from the MBS gateway to the base station;

and taking the sum of the maximum value of the time delay set and the transmission time delay from the MBS gateway to the base station as the minimum value of the MBS service sending time.

8. The system of claim 7, wherein at least one relay is present in the relay leg, wherein,

the relay branch is specifically used for acquiring the waiting time required for the relay to send the MBS service data packet to the user according to the MBS service sending time and the processing time delay of the relay in the relay branch; and sending the MBS service data packet to the user according to the acquired waiting time.

9. An MBS gateway, comprising: a determining module and a sending module, wherein,

the determining module is used for receiving the maximum processing time delay reported by each base station; forming a time delay set according to the maximum processing time delay reported by each base station; acquiring the maximum value in the time delay set; obtaining MBS service sending time according to the obtained maximum value and the transmission time delay from the MBS gateway to the base station;

the down sending module is used for sending the MBS service sending time obtained by the determining module to the base station;

obtaining the MBS service sending time according to the obtained maximum value and the transmission time delay from the MBS gateway to the base station, which specifically comprises the following steps:

summing the maximum value of the time delay set and the transmission time delay from the MBS gateway to the base station;

and taking the sum of the maximum value of the time delay set and the transmission time delay from the MBS gateway to the base station as the minimum value of the MBS service sending time.

10. A base station, characterized in that the base station comprises: an acquisition module, a reporting module, a receiving module and a processing module, wherein,

the acquiring module is used for acquiring the maximum processing time delay of the cell;

the reporting module is configured to report the maximum processing delay obtained by the obtaining module to the MBS gateway;

the receiving module is used for receiving the MBS service sending time sent by the sending module of the MBS gateway; the MBS service sending time is obtained by the MBS gateway according to the maximum processing time delay reported by each base station and the transmission time delay from the MBS gateway to the base station;

the processing module is used for sending the MBS service data packet to the relay branch according to the MBS service sending time received by the receiving module;

the MBS service transmission time is obtained by the MBS gateway according to the maximum processing delay reported by each base station and the transmission delay from the MBS gateway to the base station, and specifically includes:

forming a time delay set according to the maximum processing time delay reported by each base station;

selecting the maximum value of the maximum processing time delay reported by each base station in the time delay set;

summing the maximum value of the time delay set and the transmission time delay from the MBS gateway to the base station;

and taking the sum of the maximum value of the time delay set and the transmission time delay from the MBS gateway to the base station as the minimum value of the MBS service sending time.

11. The base station of claim 10, wherein the acquisition module comprises an acquisition unit, wherein,

the acquiring unit is used for acquiring the processing time delay of each relay branch in the cell; and acquiring the maximum value of the processing time delay according to the processing time delay of each relay branch to obtain the maximum processing time delay of the cell.

12. The base station of claim 10, wherein the reporting module comprises a reporting unit, wherein,

and the reporting unit reports the acquired maximum processing delay to the MBS gateway through a return link.

13. A relay, characterized in that the relay comprises: a reporting module, an obtaining module and a sending module, wherein,

the reporting module is used for reporting the self-processing delay to the base station;

the obtaining module is used for receiving MBS service data packets sent by the base stations and MBS service sending time, wherein the MBS service sending time is obtained by an MBS gateway according to the maximum processing time delay of each relay branch reported by each base station and the transmission time delay from the MBS gateway to the base stations;

the sending module sends the MBS service data packet to the user according to the MBS service sending time;

the MBS service transmission time is obtained by the MBS gateway according to the maximum processing delay of each relay branch reported by each base station and the transmission delay from the MBS gateway to the base station, and specifically includes:

forming a time delay set according to the maximum processing time delay of each relay branch reported by each base station;

selecting the maximum value of the maximum processing time delay reported by each base station in the time delay set;

summing the maximum value of the time delay set and the transmission time delay from the MBS gateway to the base station;

and taking the sum of the maximum value of the time delay set and the transmission time delay from the MBS gateway to the base station as the minimum value of the MBS service sending time.

14. The relay of claim 13, wherein at least one relay exists between the base station and a user, wherein,

the obtaining module is further configured to obtain, according to the MBS service sending time and the processing delay of the relay, a time required for the relay to send an MBS service packet to the user;

accordingly, the number of the first and second electrodes,

the sending module is further configured to send an MBS service data packet to the user according to the waiting time acquired by the acquiring module.

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