CN1434591A - Method for providing real time broadcasting service in mobile communication network - Google Patents

Abstract

The invention relates to a method for providing real-time broadcast service in a mobile communication network, which is realized by setting a dedicated channel. Add a dedicated broadcast channel dedicated to supporting real-time broadcast services in the downlink physical channel of the original service of the wireless access network, set the dedicated broadcast channel code, and use the original scrambling code. The addition of a dedicated broadcast channel is to add a downlink channel dedicated to broadcast services to the base station transmitters of each cell in the coverage layer of the original service macro cell. The mobile terminal works in two modes of switchable original service and broadcast service. In the broadcast service mode, the mobile terminal performs real-time broadcast service reception processing according to the nature of the cell it is in. Including: when the mobile terminal resides in the macro cell, it combines and receives the broadcast service signals of the macro cell and the adjacent macro cell; when the mobile terminal resides in the micro cell or pico cell, it combines and receives the broadcast service signals of the adjacent macro cell Signal. Suitable for use in the third generation CDMA system.

Description

A method of providing real-time broadcast service in mobile communication network

technical field

The invention relates to the technical field of mobile communication, in particular to a method for realizing real-time broadcasting in a third Code Division Multiple Access (CDMA) mobile communication system, which is a method for providing real-time broadcasting services in a mobile communication network by setting dedicated channels.

Background technique

In the existing second-generation mobile communication system, limited by the bandwidth, the services provided are relatively simple, such as the main service of transmitting voice signals. In the second-generation semi-mobile communication system, although data services have been developed, they can only be used in information query services due to the limitation of transmission rate. In the future third-generation mobile communication system, multimedia services will be provided, so in the third-generation mobile communication system, multimedia broadcast services and multicast services may also be introduced.

Currently, there are two main ways to provide broadcasting services on mobile terminals:

(1) Integrate a wireless radio or television receiver on the mobile terminal, and use the broadcasting services provided by the existing wireless broadcasting network or television broadcasting network to listen or watch. Its advantage is that it utilizes the existing network resources and does not require any modification to the mobile network, but its disadvantages are also very obvious. Because the mobile terminal needs to integrate a radio circuit or a TV receiver circuit, the cost of the mobile terminal will be greatly increased, especially When integrating a TV receiver, there is a problem that the integration is difficult and the receiving effect cannot be guaranteed;

(2) Utilize the mobile network to provide video-on-demand or audio-on-demand. For example, in the technical specifications of the current third-generation mobile communication system, because there is not enough broadcast channel capacity, the existing broadcast channel can only transmit data with low rate and low real-time requirements. TV programs or radio programs with high real-time requirements can only be provided through user-demand. Its disadvantage is that for some real-time broadcast programs, such as live TV news and sports programs, because each user's order needs to occupy a channel, network resources cannot be shared, resulting in waste of resources. Moreover, limited by resources, it is impossible to meet the needs of a large number of users to watch at the same time.

Contents of the invention

The purpose of the present invention is to design a method for providing real-time broadcast service in a mobile communication network, by setting a dedicated broadcast resource-dedicated channel code with wide coverage characteristics in the existing mobile network to provide real-time broadcast service.

The technical solution for realizing the purpose of the present invention is as follows: a method for providing real-time broadcast services in a mobile communication network, characterized in that:

Add a dedicated broadcast channel dedicated to supporting real-time broadcast services in the downlink physical channel of the original service of the wireless access network, set a dedicated broadcast channel code, and use the original scrambling code;

The mobile terminal works in switchable original service mode and broadcast service mode. In the broadcast service mode, the mobile terminal performs real-time broadcast service reception processing according to the nature of the cell it is in.

The adding of a dedicated broadcast channel is to add a downlink dedicated broadcast service channel to the base station transmitters of each cell in the coverage layer of the original service macro cell.

The dedicated broadcast channel is to send exactly the same broadcast information to each macro cell, adopt the same modulation mode, and use the same spreading factor of the channel code.

The mobile terminal, according to the nature of the cell where it receives the real-time broadcast service, further includes:

When the mobile terminal resides in a macro cell, it combines and receives the broadcast service signals of the macro cell and the adjacent macro cell; when the mobile terminal resides in a micro cell or a pico cell, it combines and receives the broadcast service signals of the adjacent macro cell.

When the mobile terminal resides in a micro cell or a pico cell, it performs cell reselection, and after relocating in a macro cell, it combines and receives the broadcast service signals of the macro cell and the adjacent macro cell.

When the mobile terminal resides in a micro cell or a pico cell and is in the connection mode, it first switches to a new macro cell with the cooperation of the network, and then combines and receives the broadcast service signals of the macro cell and the adjacent macro cell .

The combined reception of broadcast service signals of this macro cell and adjacent macro cells is based on the result of channel estimation of the common pilots of one or more macro cells with stronger signals between this macro cell and adjacent macro cells, and the received The signals of multiple macro cells are combined, and the signals on the dedicated broadcast channel are demodulated.

The method of the present invention is to support real-time, high-data-rate services by setting dedicated channels in the existing mobile communication network system; since broadcast services have the same nature, it is not necessary to add dedicated channels in each community, only It needs to be covered in the physical range, so a dedicated channel that supports real-time broadcasting can only be added to the macro cell; correspondingly, if the mobile terminal does not reside in the macro cell, when receiving broadcast services, it should receive signals from adjacent macro cells in combination. Or reselect to a macro cell with better broadcast service quality; when using a dedicated channel, the operator can activate or deactivate the broadcast service transmission signal at any time according to needs.

The present invention provides a method for real-time broadcasting services in a mobile communication network, which has the following advantages compared with the prior art:

1. The mobile terminal can complete the reception of TV programs and wireless broadcast programs by using the existing functional modules, without additional receiving circuits, which can improve the integration of mobile terminals and reduce product costs;

2. Utilize the existing, wide-coverage mobile communication network to support real-time broadcast services, which can ensure the effect of mobile terminals receiving broadcast programs;

3. Compared with program-on-demand and user independent access to broadcast programs, because the same resource supporting broadcast services can provide services to multiple mobile users at the same time, the utilization rate of wireless resources and system capacity are improved.

Description of drawings

Fig. 1 is a schematic diagram of a network structure providing real-time broadcasting services in a mobile communication system;

Fig. 2 is the wireless access network structure and working principle that dedicated channel code is set in the inventive method;

Fig. 3 is a block diagram of the structure and working principle of the mobile terminal in the method of the present invention.

Detailed ways

The present invention provides real-time broadcast services by setting dedicated broadcast resources with wide coverage characteristics-dedicated broadcast channels and dedicated broadcast channel codes in the existing third-generation mobile network.

Figure 1 shows the network structure when the mobile communication system uses dedicated broadcast resources to provide real-time broadcast services. The live sports program is provided to the real-time broadcast service content provider, and the content provider transmits the live sports program to the information transmission server, and then the information transmission server connects it to the mobile communication network, and the air interface of the mobile communication network By setting dedicated broadcast resources, broadcast to mobile terminals in real time. Here, the configured dedicated broadcast resource is a dedicated carrier. The content provider, the information transmission server and the mobile communication network may adopt a wired connection.

Referring to FIG. 2 , the figure shows the structure and working principle of the wireless access network, which is the system structure after the broadcast service mode is added.

Because in a certain area, broadcasting services can be exactly the same; and in the layered structure of cells in the third generation (3G) mobile communication system, the cells of each layer overlap each other geographically. Therefore, it is only necessary to add a downlink dedicated channel for real-time broadcasting service—a dedicated broadcasting channel—in the transmitters of each cell in the macrocell coverage layer of the original mobile paging service, and give a dedicated broadcasting channel code.

The left side of the figure shows the downlink physical channels of the original mobile paging service of the wireless access network, including the common pilot channel, broadcast channel, paging channel and other traffic channels identified by scrambling code 1; the right side of the figure shows The downlink physical channel after the real-time broadcast service is added to the wireless access network is still marked with a scrambling code 1. In addition to the original common pilot channel, broadcast channel, paging channel and other service channels, a dedicated channel-dedicated broadcast channel is added And its dedicated broadcast channel code to support real-time broadcast services.

In the technical scheme of setting dedicated channel codes in the present invention, only a channel code dedicated to broadcasting real-time information is added to the original macro cell, and the broadcast information sent by each macro cell is exactly the same as the modulation method, and the used dedicated broadcast channel The spreading factors of the codes are also the same.

Referring to Fig. 3, the structure and working principle of the mobile terminal implementing the method of the present invention. As shown in the figure, it is the hardware structure of the existing mobile terminal. It includes a main controller 401, a sending unit connected by a source coder 404, a channel coder 405, a digital/analog (D/A) converter 406, and a radio frequency (RF) transmitter 407, which is connected by a radio frequency (RF) machine 408, analog/digital (A/D) converter 409, frequency synthesizer 412, search module 416, parameter controller 417, RAKE combining receiver 410, automatic frequency correction (AFC) module 411, automatic gain correction (AGC) Module 413, channel decoder 414, source decoder 415, and system synchronization module 418 are connected to form the receiving unit, and the antenna 402 and duplexer 402 shared by the sending unit and the receiving unit.

Let the mobile terminal add the function of supporting the broadcast service, and the working mode when it supports the original service is exactly the same as that when the broadcast service function is not added. When the mobile terminal needs to receive real-time broadcast signals, if the mobile terminal is camped in the macro cell at this time, the channel estimation is performed according to the common pilots of the macro cell and one or more macro cells with strong adjacent signals As a result, the received signals of multiple macro cells are combined, and the signals on the dedicated broadcast channel are demodulated; if the mobile terminal at this time is camped in a micro cell or a pico cell, the mobile terminal only receives adjacent signals The real-time broadcast service signals of one or more macro cells are strong, and they are combined, and then the real-time broadcast service is demodulated from the combined signal; Through the cell reselection operation, the mobile terminal is allowed to reside in a macro cell again, and then receive real-time broadcast services in the first way.

After the real-time broadcasting service is added, the original working status and workflow of the mobile terminal will not be affected.

In summary, implementing the method of the present invention brings few changes to the mobile terminal and the mobile communication network, except that when the mobile terminal is in a different cell, when receiving broadcast services, the processing of the mobile terminal will be different. different. Specifically, if the mobile terminal resides in a macro cell, it will combine and receive the broadcast service signals of the local macro cell and the neighboring macro cell; if the mobile terminal resides in a micro cell or a pico cell, it cannot receive broadcast service signals from the local macro cell. The broadcast service signal can only be obtained from the merged result of the adjacent macro cell, or through cell reselection, after residing in the macro cell, and then combined to receive the broadcast service signal of the macro cell and the adjacent macro cell; if the mobile terminal camps Stay in the micro cell or pico cell, and in the connection mode, you can switch to a new macro cell at this time, but the cooperation of the network is required. The specific switching criteria should meet the quality of service (QoS) requirements, and the original service and the broadcast service Quality of service measurements are determined.

A method for providing real-time broadcast service in a mobile communication network of the present invention is especially suitable for carrying out real-time broadcast service in the third code division multiple access (CDMA) mobile communication system.

Claims (7)

1. method that real time broadcasting service is provided in mobile communications network is characterized in that:

In the down physical channel of the original business of wireless access network, set up one and be exclusively used in the dedicated broadcast channel of supporting real time broadcasting service, a dedicated broadcast channel sign indicating number is set, and uses former scrambler;

Portable terminal is by switchable former business and two kinds of mode of operation work of broadcasting service, and under the broadcasting service mode of operation, portable terminal carries out the processing that real time broadcasting service receives according to residing sub-district character.

2. a kind of method that real time broadcasting service is provided in mobile communications network according to claim 1, it is characterized in that: the described dedicated broadcast channel of setting up, be in the base station sender of each sub-district of described original professional macrocell cover layer, increase a descending channel that is exclusively used in broadcasting service.

3. a kind of method that real time broadcasting service is provided in mobile communications network according to claim 1 and 2, it is characterized in that: described dedicated broadcast channel, be to send identical broadcast message and adopt identical modulation system and use the spreading factor of identical channel code to each macrocell.

4. a kind of method that real time broadcasting service is provided in mobile communications network according to claim 1 is characterized in that described portable terminal, carries out the processing that real time broadcasting service receives according to residing sub-district character, further comprises:

When portable terminal resides at macrocell, merge the broadcasting service signal that receives this macrocell and adjacent macro cell;

When portable terminal resides at Microcell or picocell, then merge the broadcasting service signal that receives adjacent macro cell.

5. a kind of method that real time broadcasting service is provided in mobile communications network according to claim 4, it is characterized in that: described when portable terminal resides at Microcell or picocell, be by the sub-district gravity treatment, after residing at macrocell again, remerge the broadcasting service signal that receives this macrocell and adjacent macro cell.

6. a kind of method that real time broadcasting service is provided in mobile communications network according to claim 4, it is characterized in that: describedly reside at Microcell or picocell and be in connection mode following time at portable terminal, be under network cooperates, switch to new macrocell earlier, remerge the broadcasting service signal that receives this macrocell and adjacent macro cell.

7. according to claim 4 or 5 or 6 described a kind of methods that real time broadcasting service is provided in mobile communications network, it is characterized in that: described merging receives the broadcasting service signal of this macrocell and adjacent macro cell, be the result who carries out channel estimating according to public guide frequency to the stronger one or more macrocells of this macrocell and adjacent signals, the signal of a plurality of macrocells of receiving is merged, demodulate the signal on the dedicated broadcast channel.

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