WO2002013561A1

WO2002013561A1 - Dynamic allocation method of communication channel

Info

Publication number: WO2002013561A1
Application number: PCT/CN2000/000220
Authority: WO
Inventors: Jilin Zhang; Daoben Li
Original assignee: Linkair Communications, Inc.
Priority date: 2000-08-03
Filing date: 2000-08-03
Publication date: 2002-02-14
Also published as: AU2000264238A1; CN1468498A; CN1214681C

Abstract

The invention discloses a dynamic allocation method of communication channels, wherein downlink communication traffic channels are divided into a number of traffic channel groups. Any mobile station in a data traffic state belongs to one traffic channel group, monitors all data traffic channels in this traffic channel group, extracts packet switch data of this mobile station therefrom. Preferably, in case of there is a flow overload on some traffic channel groups, the mobile station is handed off from the current home traffic channel group to another more free traffic channel group. The method may prevent mobile stations from consuming a large amount of hardware facilities and battery energies, substantially reducing complicate degree and difficulty of mobile station designs.

Description

Method for dynamically allocating communication channel

Technical field

The present invention relates to a mobile communication method, and in particular to a method for dynamically allocating communication channels, which is used for flexible and reasonable dynamic allocation of communication channels, but is not limited thereto. Background of the invention

The main services undertaken by the first-generation analog mobile communications and the second-generation digital mobile communications are voice services and limited data services. The third-generation mobile communication will bear more services including voice and image, and its required transmission rate ranges from a few kbps to 2M bps. Therefore, how to flexibly and reasonably arrange channel resources to meet the requirements of different services has become the first A key issue discussed in three generations of mobile communications. In addition, in the third-generation mobile communication system, due to the expansion of service types, the uplink and downlink traffic will be greatly different, and the downlink traffic will generally be greater than the uplink traffic. For example, for users using a laptop to browse the Internet, the amount of information they receive is much greater than the amount of information they send out. And this kind of business will become one of the main business of wireless communication in the future.

Therefore, in the third-generation mobile communication system, if the data service mobile communication network is designed, as in the past, the circuit interface is simply used in the air interface to perform data interaction in the air interface as in the past. It is difficult to adapt to the needs of new services, especially burst data services. Therefore, if you want to ensure both the quality of the communication and the utilization of the communication channel during the data transmission, it will be difficult for this industry. Assign appropriate communication channels. To solve this problem, we can easily think of packet switching. Packet switching can undoubtedly solve the above problems. The packet switching method is that the communication channel is not determined before data transmission, that is, the base station does not specifically assign a channel to the mobile station, and the mobile station will monitor all communication channels and extract its own data from it. There are many methods for dynamically allocating communication channels, such as the method described in patent US005790551. In the patent US005790551, the base station and the mobile station perform signaling exchange through an uplink service control channel and a downlink service control channel to realize dynamic allocation of service channels. Regarding the dynamic allocation of downlink traffic channels, this patent indicates that all mobile stations that need to perform data services need to monitor all data traffic channels and extract information from their mobile stations. This method is suitable when the number of data service channels is small. In the third generation of mobile communications, due to the huge changes in service types and service volumes, if this dynamic allocation method is applied again, the data service channels will be monitored. Will cause the mobile station to consume a lot of hardware facilities and battery energy, increasing the complexity and difficulty of mobile station design. Summary of the invention

The purpose of the present invention is to provide a communication channel allocation method that is simple to implement and has a wide range of applications, to avoid the mobile station from consuming a large amount of hardware facilities and battery energy to adapt to data services, and to significantly reduce the complexity and difficulty of mobile station design.

In a communication system including a fixed network and a plurality of user terminals, the present invention provides a scheme for dynamically allocating communication channels: a downlink communication service channel is allocated It is divided into several traffic channel groups. Any mobile station in the data service state belongs to a traffic channel group, monitors all the data traffic channels in the traffic channel group, and extracts the packet-switched data of the mobile station from it.

Preferably, in the case where the traffic of a certain traffic channel group is overloaded, the mobile station is switched from the traffic channel group to which it currently belongs to other idle traffic channel groups.

Preferably, the uplink data service adopts a circuit switching method or a packet switching method.

Preferably, the communication channel is a time division duplex (TDD) channel. In a data service, a communication service channel resource allocated in a downlink is more than a communication service channel resource allocated in an uplink. According to the dynamic allocation method of the communication channel provided by the present invention, since the mobile station does not need to monitor all the downlink data service channels, the mobile station does not need to add more hardware to adapt to the data service, and meanwhile, the mobile station The power consumption is significantly reduced, which effectively increases the battery life. The method of the present invention can reduce the complexity and difficulty of mobile station design. Using this method, the communication channel can be effectively used to transmit data, which is suitable for a large number of data services in a digital mobile communication system. Brief description of the drawings

In order to make the objectives, schemes, and advantages of the present invention clearer and clearer, the following specific measures are preferred: The embodiments and the accompanying drawings will further explain the present invention in detail.

FIG. 1 is a schematic block diagram of a mobile communication system;

Figure 2 is a TDD-CDMA mobile communication system as an example, the schematic diagram of the communication traffic channel used, where (I, J), I represents the slot number, J represents the code channel number;

FIG. 3 is a grouping diagram illustrating communication traffic channels;

4 is a flowchart of a downlink data service implemented by a mobile station in a second preferred embodiment of the present invention;

5 is a flowchart of a base station dynamically allocating a downlink data service channel to implement a downlink data service in a second preferred embodiment of the present invention;

6 is a flowchart of a mobile station implementing an uplink data service in a second preferred embodiment of the present invention;

7 is a flowchart of a base station dynamically assigning an uplink data service channel to implement an uplink data service in a second preferred embodiment of the present invention;

FIG. 8 is a flowchart of resource switching by a base station in the third preferred embodiment of the present invention; FIG. 9 is a flowchart of resource switching by a mobile station in the third preferred embodiment of the present invention. Mode of Carrying Out the Invention

The method for dynamically allocating a communication channel of the present invention will be described in more detail below with reference to the drawings and preferred embodiments. The invention divides all communication service channels into several groups, and also divides mobile stations in the communication service state into equal numbers of groups. The service channels of a certain group provide communication services for mobile stations with the same group number. When the traffic of a certain group of traffic channels is overloaded, some mobile stations of the group can be switched to other traffic channel groups to achieve the purpose of mitigating the traffic of the group of traffic channels.

FIG. 1 shows a brief block diagram of a mobile communication system. Only one base station and one mobile station are shown in the figure. The actual system will include multiple base stations and multiple mobile stations. In the figure, the communication channel 102 links the mobile station 101 and the base station 103: the mobile station 101 maps the uplink data to the uplink communication channel 102 and transmits it to the base station 103; the base station 103 maps the downlink data to the downlink communication channel 102, Transfer to mobile station 101. The network controller 104 links the base station 103 and the core network 105, it exchanges data information with the base station 103, and provides various other functions, such as information routing, scheduling, network control, and the like. The core network 105 is a multi-type signal source for a certain base station, and it also needs some information of the base station. In a first preferred embodiment of the present invention, the communication channel is a time division duplex (TDD) channel. In a data service, a communication service channel resource allocated in a downlink is more than a communication service channel allocated in an uplink. Resources. The following uses TDD-CDMA mobile communication system (time division code division multiple access mobile communication system) as an example to explain the organizational structure of the communication channel in the present invention. As shown in Figure 2, we assume that this system has 10 time slots per frame and has 12 time slots. Each time slot has 8 code channels that can be used for service channels. Thus, in this system, we can assume that there are 12 * 8 = 96 communication service channels every 10ms. We label each traffic channel as (I, J), where I represents the slot number and J represents the code channel number. The 96 service channels are divided into six groups (it can also be divided into four groups, three groups, or two groups, which will be determined according to the maximum data traffic provided by the system, and we will use only six groups as examples to explain).

As shown in Figure 3, the 96 traffic channels are divided into six groups. We label each group as group 1 (1 = 1, 2, ···, 6). Among them, group I represents a set of 8 code channels of time slot I and 8 code channels of time slot 1 + 6, a total of 16 communication channel sets. In this way, we divided the 96 service channels into 6 groups, each group having 16 communication channels.

In a data service mobile communication system, the uplink and downlink services of the air interface are asymmetric, the amount of uplink data traffic is small, and the amount of downlink data traffic is large. This embodiment specifically proposes a communication channel dynamic allocation scheme when the uplink and downlink traffic volume is not equal, thereby improving the service performance in the digital communication system. We can assign group 6 to the upstream and groups 1-5 to the downstream. In this way, the capability of the system to provide uplink and downlink services is 1 to 5. This ratio does not mean that it is the optimal ratio. The specific allocation of uplink and downlink communication resources will be determined based on the actual uplink and downlink traffic.

From the perspective of the air interface, we treat the characteristics of the uplink and downlink data services differently. The traffic of the uplink data service can be controlled, but the traffic of the downlink data service is difficult to control. Therefore, the methods for implementing the uplink and downlink data services are different. Within the group, the downlink data industry Services are implemented using packet switching. Within the total uplink data service channel, uplink data services are implemented using circuit switching. 4 is a flowchart of a mobile station implementing a downlink data service in a second preferred embodiment of the present invention. FIG. 4 shows a process in which a mobile station obtains a downlink communication service channel and performs a downlink data service. When a user needs to perform a downlink data service, the mobile station will send a "downlink data service demand message" to the base station, and then wait for a response from the base station to enter a 402 state. If the message that the base station responds to the mobile station is a "no resource message", it means that the resources are tight and there is no downlink traffic channel, then the mobile station will end the operation. If the message that the base station responds to the mobile station is a "channel allocation message", the mobile station will send a confirmation message to the base station to indicate that it has received this message and enters the 403 state. In the 403 state, the mobile station will monitor the group I according to the received "channel allocation message" instruction, and extract the messages belonging to itself, and then enter the 404 state. In the 404 state, the extracted message is analyzed. If the extracted message is a "service end message", the mobile station will end the operation, otherwise the mobile station will process the message according to the upper layer protocol.

FIG. 5 is a flowchart of a base station dynamically allocating a downlink data service channel to implement a downlink data service in a second preferred embodiment of the present invention. Figure 5 shows the base station receives the "downlink data service demand message from the mobile station, and then performs the process of traffic channel allocation. When receiving the" downlink data service demand message "from the mobile station, the base station will respond to the current downlink data The status of the traffic channel is evaluated. If the evaluation result indicates that the downlink data service channel resource is tight, the base station will send a "no resource message" to the mobile station and end the operation. If the evaluation results show that the channel resources of the downlink data service are not tight, the base station will find a relatively free group I according to the analysis above, and send a "channel allocation message" to this mobile station, and enter the 502 state. In the 502 state, the base station will receive a "channel allocation confirmation message" from the mobile station. After receiving the "channel allocation confirmation message", the base station knows that the mobile station is ready to receive data in the communication service channel of group I, and then notifies the core network that air interface resources are ready and enters the 503 state. In the 503 state, the base station maps the message sent by the core network to the communication service channel of group I and sends it to the mobile station. If the core network sends a "service end message", the base station will clear the mobile station's record in group I, and send this message to the mobile station, and then end the operation. Otherwise, the base station will continue to monitor the core The network sends a message belonging to the mobile station to the mobile station.

FIG. 6 shows a process in which a mobile station requests an uplink communication service channel from a base station in this embodiment. When an uplink data service is required, the mobile station sends an "uplink data service demand message" to the base station, and enters the 602 state. In the 602 state, the mobile station will receive relevant messages from the base station. If the received message is a "no resource message", the mobile station will end the operation. If the received message is a "resource message", the mobile station will perform service negotiation with the base station. The content of the service negotiation mainly includes how many uplink data service channels are provided for the mobile station. If the service negotiation fails, the mobile station will end the operation. No. The mobile station will receive a "channel assignment message" from the base station. According to "channel assignment message" The mobile station maps the uplink data to the corresponding uplink data service channel and sends it to the base station. If the uplink data service ends, the mobile station will send a "service end message" to the base station.

FIG. 7 illustrates a process of allocating an uplink data service channel after the base station receives the "uplink data service demand message" of the mobile station in this embodiment. After receiving the "uplink data service demand message" from the mobile station, the base station will analyze the status of the uplink data service channel. If there is no idle uplink data traffic channel, the base station will send a "no resource message" to the mobile station and end this operation. If there is an idle uplink data traffic channel, the base station will send a "resource message" to the mobile station and enter the 702 state. In the 702 state, the base station will negotiate with the mobile station to discuss the specific allocated channel pattern. If the negotiation fails, the base station will end the operation. If the negotiation is successful, the base station will send a "channel allocation message" with corresponding content to the mobile station according to the result of the negotiation, and enter the 703 state. In state 703, the base station will monitor the allocated uplink data traffic channel. After receiving the message sent by the mobile station, the base station will forward the message to the core network and judge the message. If this message is a "service end message", the base station will end the operation. If this message is not a "service end message", the base station will continue to monitor the allocated uplink data service channel. Because the downlink data service traffic is not constant, it is difficult to ensure the rationality of the first channel allocation. Therefore, in the third preferred embodiment of the present invention, we Change the data service traffic and adjust the downlink data service channel. The specific adjustment methods are as follows: If group I cannot bear the data service traffic that needs to be transmitted, then some mobile stations corresponding to group I are transferred to other groups, and if other groups are also unable to bear the increased data service traffic, then it will be considered Forcibly cut off the downlink data services provided for some mobile stations.

FIG. 8 is a flowchart of resource switching performed by a base station in a third preferred embodiment of the present invention. Figure 8 shows the method of load sharing between groups when the base station detects the overload of group I traffic. After detecting that the traffic of group I is overloaded, the base station will detect the traffic of other groups to find a group J that is relatively free. According to the traffic situation of each mobile station in group I and the traffic situation of group J, select mobile station A served by group I to switch to group J, and then want mobile station A to send a "resource switching message" and enter the 802 state. In the 802 state, the base station receives a "resource handover confirmation message" from the mobile station, and the mobile station uses this message to indicate that the mobile station is ready to receive data in the data traffic channel of group J. After receiving the "resource handover confirmation message", the base station will clear the record of mobile station A in group I and record that group J serves mobile station A. Thereafter, if the base station receives the message sent by the core network to mobile station A, the base station will map this message to the data traffic channel of group J and send it to mobile station A.

FIG. 9 is a flowchart of resource switching performed by a mobile station in a third preferred embodiment of the present invention. FIG. 9 shows the resource switching process adopted by the mobile station after receiving the "resource switching message" from the base station. After receiving the "resource switching message" from the base station, the mobile station will monitor the data services of group I and group J according to the indication of this message (switch from group I to group;!) Channel, and send a "resource switching confirmation message" to the base station. Thereafter, if the mobile station

After J receives the message sent by the base station, the mobile station will stop monitoring the data service channel of group I, and only monitor the data service channel of group J. It is obvious and understood by those skilled in the art that the preferred embodiments of the present invention are only used to illustrate the present invention, and are not intended to limit the present invention. The technical features in the embodiments of the present invention may be arbitrarily combined. Without departing from the idea of the present invention. According to the method for dynamically allocating communication channels disclosed in the present invention, there are many ways to modify the disclosed invention, and in addition to the above-mentioned specific preferred modes, the present invention may have many other embodiments. Therefore, any method or improvement that can be obtained according to the concept of the present invention should be included in the scope of rights of the present invention.

Claims

Claim

1. A method for dynamically allocating communication channels, characterized in that a downlink communication service channel is divided into a plurality of service channel groups, and any mobile station in a data service state belongs to a service channel group and monitors the service channel All data traffic channels in the group are used to extract the packet-switched data of the mobile station.

1. The method according to claim 1, characterized in that, when the traffic of a certain traffic channel group is overloaded, the mobile station is switched from the traffic channel group to which it currently belongs to other relatively idle traffic channel groups.

3. The method according to claim 1, wherein the uplink data service adopts a circuit switching method or a packet switching method.

4. The method according to claim 1, wherein the communication channel is a time division duplex channel, and in a data service, a communication service channel resource allocated in a downlink is more than a communication service channel allocated in an uplink. Resources.

5. The method according to claim 1, 2, 3, or 4, characterized in that the base station establishes a data service service for the mobile station according to the request of the mobile station, and the establishment process includes the following steps:

The base station receives the service-required information from the mobile station;

The base station evaluates each downlink data service channel group, and finds and selects a relatively idle data service channel group;

The base station records the selected service channel group to provide radio resources for the mobile station, and The mobile station sends a channel allocation message;

The mobile station sends a channel allocation confirmation message to the base station, and monitors the data service channel of the allocated service channel group, in order to extract its own service message from it; the base station maps the service message sent by the core network to the mobile station to the selected The communication traffic channel group is forwarded to the mobile station.

6. The method according to claim 1, 2, 3, or 4, characterized in that, in a case where the traffic of a certain service channel group is overloaded, the mobile station is switched from the currently-owned service channel group to other idler channels In the service channel group, the switching includes the following steps:

The base station detects that a channel group traffic is overloaded;

The base station detects traffic conditions of other channel groups to find the most idle channel group; the base station sends a resource switching message to the mobile station;

After receiving the handover message from the base station, the mobile station sends a handover confirmation message to the base station, and monitors the data service channel of the original service channel group and the new service channel group to be allocated;

After receiving the mobile station handover confirmation message, the base station stops the service of the original service channel group for this mobile station, and records that the new service channel group serves this mobile station;

The base station receives a service message sent to the mobile station, maps the service message to the handover data service channel group, and sends it to the mobile station;

The mobile station determines whether the received service message is mapped to the new service channel group. If so, it stops monitoring the data service channel of the original service channel group, and only monitors the new service channel. The data traffic channel of the group.

7. The method according to claim 1, 2, 3, or 4, characterized in that the uplink data service adopts a circuit switching method or a packet switching method, and according to the uplink service request sent by the mobile station, the base station is mobile Stations establish uplink data service services, and the establishment process includes the following steps:

The base station receives an uplink data service request message from the mobile station;

The base station analyzes the status of the uplink data service channel, and sends a resource message to the mobile station when there is an idle uplink data service channel;

The base station performs a service negotiation with the mobile station, and if the negotiation is successful, the base station sends a channel allocation message corresponding to the content of the negotiation to the mobile station according to the negotiation result;

The base station monitors the uplink data service channel allocated to the mobile station, receives the service message sent by the mobile station and forwards it to the core network.