CN100387069C - Method for allocating wireless reverse channel in trunking service in cellular communication system - Google Patents

Abstract

The invention relates to a method for allocating wireless reverse channels in trunking services in a cellular communication system, which forms a complementary effect with the method for establishing a wireless reverse channel for each user, and provides trunking service users with shared wireless reverse channels service to save back channel resources. The method of the present invention is that in the voice group call service, the base station control center allocates a shared wireless reverse channel and at least one forward broadcast channel for multiple wireless terminals of the same cluster group in the same cell. During implementation, the shared reverse channel can be a fixed reverse channel pre-allocated to each cell. When a user applies for speaking, the reverse channel is used, and after the speech is completed, the reverse channel is given up for other users who apply for speaking. Use; it can also be a reverse channel dynamically applied for by a group of users who apply for speaking in each cell. After the user finishes speaking, the reverse channel is recovered, and other users re-apply when they speak.

Description

Method for allocating wireless reverse channel in trunking service in cellular communication system

technical field

The present invention relates to mobile communication technology, more specifically to a method for allocating wireless reverse channels in trunking services in a cellular communication system.

Background technique

The wireless channel is divided into a forward channel and a reverse channel. The forward channel refers to the channel from the base station to the wireless terminal, while the reverse channel refers to the channel from the wireless terminal to the base station. Assuming that A is a base station and B is a wireless terminal, then the communication in the direction of A->B goes through the forward channel, and the communication in the direction of B->A goes through the reverse channel.

Voice group call service and voice broadcast service are two main services in the trunking communication service. The typical application of the trunking service is group call, which is characterized in that the conversation is carried out between members of a plurality of groups (group members may be referred to as group members for short).

The voice group call service (VGCS: voice Group Call Service) in the mobile communication system realizes the cluster call in half-duplex mode. Usually, there are two types of group members in a cluster group: one or more dispatchers and one or more cluster service users. A dispatcher must be authorized by the system to become a dispatcher. The user terminal as a dispatcher can be any telephone equipment, such as an ordinary fixed telephone or a public network mobile phone of various standards, but the trunking service user must be a wireless terminal supporting the trunking service. Any trunk service user and any authorized dispatcher in a trunk group can initiate a group call request. When a group call request is initiated, all dispatchers in the trunk group and trunk service users within the group call range can receive the group call initiation request. Any dispatcher can speak at any time, but at the same time, only one trunking service user is allowed to speak, and they obtain the right to speak by pressing the PTT key.

The characteristics of the voice group call service are: when each trunking service user listens, what they hear is the same; only one trunking service user can speak at the same time.

Although the trunking service has a long history, it is still a new thing for the cellular communication system operating as a common network, so it also poses new challenges in its implementation technology.

At present, the cellular communication system allocates and establishes a wireless reverse channel for each user to provide services for the users.

When the cellular communication system provides trunking services, if this technology is still used to allocate a wireless reverse channel for each trunking service user, it will cause a great waste of wireless reverse channels, because among many trunking service users, the same Only one user speaks at a time; doing so at the same time will also affect the capacity of the cell.

Contents of the invention

The purpose of the present invention is to design a method for allocating a wireless reverse channel in a trunking service in a cellular communication system, and to form a complementary effect with a method for setting up a wireless reverse channel for each user, by utilizing a shared wireless reverse channel for the cluster Service users are provided to achieve the purpose of saving wireless reverse channel resources.

The technical scheme that realizes the object of the present invention is such: a kind of cellular communication system distributes the method for wireless reverse channel in trunking service, it is characterized in that:

In the voice group call service, the base station control center allocates a shared wireless reverse channel for multiple wireless terminals of the same cluster group in the same cell according to the received resource assignment request of the voice group call service.

It also includes: when the base station control center receives the resource assignment request of the voice group call service, according to the list of serving cells in the request message, allocate at most one forward broadcast channel for broadcasting messages to each serving cell.

The shared wireless reverse channel can be a fixed wireless reverse channel pre-allocated to each cell. When a trunking service user in the same cell applies for speaking, the fixed wireless reverse channel is provided to the user for use, and the user finishes speaking. Then give up the fixed wireless reverse channel for other users who apply for speaking in the same cell and the same cluster group.

The shared wireless reverse channel can also be a wireless reverse channel dynamically allocated to a trunking service user who applies for speaking in each cell, and the wireless reverse channel is recovered after the user finishes speaking.

The method of the present invention adopts the shared wireless reverse channel to provide services for trunking service users. The shared wireless reverse channel can be allocated in advance, and whoever applies for it can use it; it can also apply for allocation at any time. Since all trunking service users in a cell share a wireless reverse channel, the construction, operation, and maintenance costs of the cellular communication system are reduced; in addition, the capacity of the cell is improved through wireless channel sharing.

The method of the present invention can be applied to the mobile application technical scheme in the code division multiple access cellular mobile communication network, but is not limited thereto.

Description of drawings

Fig. 1 is the block flow diagram of VGCS business fixed assignment reverse channel method;

Fig. 2 is a flowchart of a method for dynamically allocating reverse channels for VGCS services.

Detailed ways

According to the characteristics of the VGCS service, each cluster service user hears the same content at the same time, so there is no need to allocate a forward channel for each user in the same cell, and only one forward shared channel can be allocated for All users listen; in addition, each service user can speak at different times, but only one user can speak at the same time, so in the same cell, only one reverse shared channel can be allocated for all trunking service users in the cell shared.

In the voice group call service, according to the idea of sharing the wireless reverse channel in the present invention, two allocation methods can be used to share the reverse channel: fixed allocation of the shared reverse channel and dynamic allocation of the shared reverse channel.

Fixed allocation of shared reverse channels is to pre-allocate a fixed reverse channel for all trunk group users in the same cell. When a user needs to speak, the fixed reverse channel can be provided to the user by applying After the user finishes speaking, the reverse channel is given up, and the vacated reverse channel can be allocated to other users in the cluster group who have applied and obtained success in the cell.

Dynamic allocation of the shared reverse channel means that the reverse channel is allocated only when a user applies for speaking, and the reverse channel is released (recycled) after the user finishes speaking, and the next time a user in the same cell applies for speaking, the reverse channel will be released again. Reapply and reallocate backchannels.

The common feature of the two allocation methods is that at the same time, at most one reverse channel is allocated to all users of the same cluster group in a cell.

Taking the VGCS business as an example, the implementation method of fixed allocation and dynamic allocation of reverse channels of the present invention is described. An important feature of the VGCS service is that all trunk group service users listen at the same time, but at most one trunk group service user can speak at the same time. Therefore, in the same cell, no matter there is only one user or multiple users, it is completely possible to establish a forward broadcast channel and a reverse shared channel. Since all users can only listen to one forward channel at the same time to achieve the purpose of everyone listening at the same time, and because at most one user is allowed to speak at the same time, only one forward broadcast channel and one reverse channel can be allocated. VGCS business needs.

Referring to FIG. 1 , it shows the implementation process of fixed allocation of reverse channels for VGCS services.

Step 11, when the base station controller in the base station subsystem (BSS) receives the resource assignment request of the VGCS service, it allocates the serving cell assignment resources according to the serving cell list in the message, wherein in each cell at most only A forward channel for broadcasting messages and a shared reverse channel for all VGCS service users in the cell to speak;

Step 12, when there is a VGCS service user applying for speaking in the cell and the network side has authorized it, the base station controller in the base station subsystem (BSS) tells the applying user that the reverse channel used by it is the corresponding cell that has been allocated shared reverse channel;

Step 13, the applicant user gives up the allocated shared reverse channel after speaking;

Step 14, when other VGCS service users in the same cell apply for speaking and succeed, the base station controller in the BSS reassigns the shared reverse channel to other users, and the allocated fixed shared reverse channel will be used until the VGCS service stops was released.

Referring to FIG. 2 , it shows the implementation process of dynamically allocating reverse channels for VGCS services.

Step 21, when the base station controller in the BSS receives the resource assignment request of the VGCS service, it allocates the serving cell assignment resources according to the serving cell list in the message, and assigns at most one forward for each cell. A channel for broadcasting messages, but no reverse channel is currently assigned. Assign at most one forward channel for broadcasting messages, because there may be no VGCS service users in some cells, and the system can not allocate forward broadcast channels according to its own strategy;

Step 22, when a VGCS service user in the cell applies for speaking, and the network side has authorized it, the base station controller in the BSS dynamically applies for a reverse channel for use by the VGCS service user in the corresponding cell;

Step 23, the base station controller in the BSS reclaims the reverse channel after receiving the signaling that the VGCS service user has finished speaking;

Step 24, when other VGCS service users in the cell apply for speech and succeed, the base station controller in the BSS applies for a reverse channel again. In this way, there is at most one reverse channel in a cell at the same time.

Claims (6)

1. cellular communication system distributes wireless back channel in group service method is characterized in that:

In voice group call service, base station control center is shared wireless back channel of a plurality of wireless terminals distribution of the same cluster group in the same sub-district according to the resource assignation request of the voice group call service that receives.

2. cellular communication system according to claim 1 distributes the method for wireless back channel in group service, it is characterized in that also comprising: when base station control center receives the resource assignation request of voice group call service, according to the Serving cell in request message tabulation, for each Serving cell to Forward Broadcast Channel that is used for broadcast of overabsorption.

3. cellular communication system according to claim 1 and 2 distributes the method for wireless back channel in group service, it is characterized in that: a described shared wireless back channel is the fixing wireless back channel of allocating in advance to this sub-district, when the cluster service user application speech of same sub-district, the wireless back channel that this is fixing offers this user and uses, after finishing, this user's speech then abdicates this fixing wireless back channel, for user's use of other application speeches in same sub-district, the same cluster group.

4. cellular communication system according to claim 3 distributes the method for wireless back channel in group service, it is characterized in that: described fixing wireless back channel, be when base station control center receives the resource assignation request of voice group call service, according to the tabulation of the Serving cell in the request message, for each Serving cell distributes a wireless back channel.

5. cellular communication system according to claim 1 and 2 distributes the method for wireless back channel in group service, it is characterized in that: a described shared wireless back channel, be wireless back channel, after this user's speech finishes, promptly reclaim this wireless back channel for a cluster service user dynamic assignment of application speech in the same sub-district.

6. cellular communication system according to claim 5 distributes the method for wireless back channel in group service, it is characterized in that: the wireless back channel of described dynamic assignment, be when the cluster service user application is talked, by a wireless back channel of the dynamic application of base station control center; Base station control center receives this user and talks and reclaim this wireless back channel after the signaling that finishes.

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