CN100525480C - A method of dynamically assigning transmission time slot in Abis interface of mobile communication system - Google Patents

Abstract

The invention relates to a method for dynamically allocating transmission time slots in the Abis interface of the GSM system, which includes the following steps: taking the minimum slot as the basic unit for the ground circuit of the Abis interface of the system, and determining the main time slot and the spare resource pool, Among them, the time slots in the backup resource pool are additional time slots; determine the priority of applying for additional time slots for various services provided by the system; when a certain type of service in the system needs more Abis interface time slots, apply for additional time slots from the backup resource pool At this time, the reserve resource pool decides whether to provide additional time slots according to the priority of this type of business and the situation of the reserve resources; Released and returned to the standby resource pool for use. On the other hand, the present invention also provides a device for realizing the above method. The invention can maximize the utilization rate of the time slot resources of the Abis interface, and can better meet the service requirements.

Description

A method for dynamically allocating transmission time slots in Abis interface of mobile communication system

technical field

The invention relates to the technical field of mobile communication, in particular to a method for dynamically allocating transmission time slots by an Abis interface in a mobile communication system for different service rates.

Background technique

The communication system is playing an increasingly important role in social life. The growth of people's demand for communication promotes the rapid development of communication system technology, especially the mobile communication system. From the traditional GSM system to the GPRS system (General Packet Radio Service, general packet radio systems) are rapidly evolving. In order to provide higher communication bandwidth and meet the requirements of various real-time packet services, the EGPRS system (Enhance GPRS) has been developed; on the other hand, due to the continuous growth of the GSM user base, operators have to It can provide voice services for more users, and there are more and more demands for HR (Half-Rate) voice services. In particular, the system is required to automatically convert FR (Full-Rate) channels to HR channels for different time periods. Support more channels or merge HR channels into FR channels to provide better call quality.

The GSM base station subsystem generally adopts the structure shown in Fig. 1 . In Fig. 1, BSC is a base station controller, BTS is a base transceiver station, and CCU is a channel coding unit. The base transceiver station completes the mapping of the wireless interface (Um), the ground circuit Abis interface between the BTS and the BSC. The GSM system generally adopts the circuit time slot of 16kbit/s as the minimum unit in the Abis interface. In this way, in the initial GSM system, since the traffic channel of the wireless interface carries voice service or packet service, its rate will not exceed 16kbit/s, so the channel of the wireless interface and the 16kbit/s time slot of the Abis interface are the same One mapped over. However, in the EGPRS system, when the wireless interface channel is used for packet services, the coding and modulation methods and rates are different, as shown in Table 1. When using the MCS-3~MCS-9 encoding method, it is required that the channel of one wireless port corresponds to the time slots of 2~5 Abis interfaces.

Table 1

modulation coding scheme Maximum rate [kbp/s] MCS-9 59.2 MCS-8 59.2 MCS-7 44.8

MCS-6 29.6 MCS-5 22.4 MCS-4 17.6 MCS-3 14.8 MCS-2 11.2 MCS-1 8.8

In this regard, a better solution at present is to first correspond a packet service channel of the wireless interface to a circuit time slot of an Abis interface, and at the same time take a part of time slots from the Abis interface as a spare resource. When the required bandwidth exceeds one Abis interface circuit time slot, one or more corresponding packet service channels of this wireless interface are taken out from the spare resources. For example, the Chinese patent "A General Packet Radio Service Data Frame Signal Transmission Method" with the patent application number 01126612.0 handles the CS-3 and CS-4 packet services in the GPRS service in this way.

The disadvantage of this method is that the reserve resources are only used for packet services, and the utilization of the reserve resources in all services is not considered comprehensively. The circuit resources of the Abis interface should not only be used in packet services, but more importantly, used in voice service processing. For the GSM system, the purpose of the operator is to use limited resources to provide services to users to the maximum extent. Therefore, the spare resources of the Abis interface should be fully considered and allocated according to the real-time needs of all services in the system, so as to maximize the efficiency of resource use. , to better meet business needs.

For the HR voice service, one service channel of the original wireless interface can be converted into two service channels supporting HR. Since the actual 8kbit/s bandwidth can carry one HR voice service, but because the minimum circuit time slot unit of the general Abis interface is 16kbit /s, so the current way to support HR is: when one service channel originally supporting FR on the wireless interface is converted into two service channels supporting HR, the Abis interface is required to have two time slots, because these two time slots can only Fixedly used for these two HR voice services will greatly waste Abis interface resources; at the same time, because part of the Abis interface spare time slot resources are used as backup resources for packet services, the Abis interface time slot resources are very tight and can be converted to HR The channel is thus greatly limited.

It can be seen from the above that, because the prior art considers various services, such as voice service and packet service, separately, the disadvantage of poor resource utilization of the Abis interface time slot is caused.

Contents of the invention

The purpose of the present invention is to provide a method for sharing and dynamically allocating Abis interface spare time slot resources, thereby more effectively and fully utilizing Abis interface resources.

In order to achieve the above object, the present invention divides Abis interface time slot resources into two parts, the main time slot and the backup resource pool, wherein the main time slot refers to a single time slot where the original wireless port service channel is mapped to the Abis interface, and the backup resource pool is Refers to all the remaining time slots on the Abis interface, and defines the time slots in the standby resource pool as additional time slots. When a certain type of business in the system needs more time slots, no matter what kind of business it is, it will uniformly request from the backup resource pool. Among them, the application priority of various services, such as voice service and packet service, is set, so that the backup resource pool can meet the needs of each service in turn according to the priority of each service.

Based on this, on the one hand, the present invention provides a kind of method in the Abis interface of GSM system dynamically allocating transmission time slot, and it comprises the steps:

Step 1: Use the smallest slot as the basic unit for the ground circuit of the Abis interface, establish a corresponding relationship between some wireless port service channels and some Abis interface time slots, and set this time slot as the main time slot; then set part or all of the Abis interface The free time slot is set as a spare resource pool, and the time slots in the spare resource pool are additional time slots;

Step 2, when each business of the system needs more Abis interface time slots, apply for additional time slots to the backup resource pool, and the backup resource pool decides whether to provide additional time slots according to the backup resource situation;

Step 3: When the system service no longer needs too many Abis interface time slots, the occupied additional time slots will be released and returned to the standby resource pool for use.

According to the method of the present invention, between step 1 and step 2, it also includes a step of setting the priority of each service of the system to apply for additional time slots; The pool further determines the order of providing additional time slots according to the priority of each service.

According to the method of the present invention, when simplifying the processing, it is set that all kinds of services of the system apply for additional time slots with the same priority.

According to the method of the present invention, when the system allocates an additional time slot in the spare resource pool to a type of business, the additional time slot is set to the "allocated" state, and the wireless port service channel and the Abis The corresponding relationship between the interface and the time slot is notified to the base transceiver station.

According to the method of the present invention, in the third step, when the system reclaims the released additional time slot, it is set to the "unallocated" state, and the wireless interface service channel is no longer sent to the base station corresponding to the additional time slot transceiver station.

On the other hand, the present invention provides a device for allocating time slot resources of the Abis interface in the GSM system, which includes a base station controller, a base transceiver station, and an Abis interface connecting the base station controller and the base transceiver station, wherein the Abis interface The minimum slot is taken as the basic unit; the device also includes a main time slot and a standby resource pool determination module, which is used to establish the Abis interface time slot corresponding to the wireless interface service channel as the main time slot, and the other Abis interface time slots Idle time slots are spare resource pools, and the time slots in the spare resource pool are supplementary time slots; the supplementary time slot request module is used to judge whether a certain type of service in the system needs more Abis interface time slot resources, and send the backup time slot resources to the spare time slots when necessary. The resource pool applies for additional time slots; the additional time slot providing module is used to determine whether to provide additional time slots according to the situation of the standby resource when each service of the system applies for additional time slots from the backup resource pool; the additional time slot recovery module is used for When the business of the system no longer needs too many Abis interface time slots, the additional time slots provided for it are recovered to the spare resource pool for use.

According to the device of the present invention, it further includes a priority setting module, which is used to determine the priority of each service provided by the system to apply for additional time slots; when the additional time slot providing module can provide additional time slots, according to the priority of each business The stage determines the order in which additional slots are provided.

According to the device of the present invention, when simplifying the processing, the priority setting module sets the priorities of all kinds of service application time slots provided by the system to be the same.

According to the device of the present invention, when the additional time slot providing module allocates an additional time slot in the reserve resource pool to a type of service, it sets the additional time slot to the "allocated" state, and notifies the base station to send and receive The corresponding relationship between the service channel of the wireless port of the station and the time slot attached to the Abis interface.

According to the device of the present invention, the additional time slot recovery module sets it to the "unallocated" state when recovering the additional time slot and sends the wireless port service channel no longer corresponding to the additional time slot to the base transceiver station .

Since the reserve resource pool is based on each Abis interface terrestrial circuit, each additional time slot of the reserve resource pool of the same terrestrial circuit can be dynamically used together with the main time slot in this terrestrial circuit.

After the present invention adopts above-mentioned scheme, following advantage is arranged:

1. It greatly improves the utilization rate of ground resources and satisfies the system requirements to the greatest extent;

2. Share Abis interface ground resources according to business priority, which improves the flexibility of resource sharing and better meets user needs;

3. It can provide as many HR voice services as possible on the basis of existing hardware.

Description of drawings

Fig. 1 is a schematic diagram of the position of the Abis interface in the mobile communication system.

Fig. 2 is a schematic diagram illustrating the dynamic use of additional time slots by various services by taking voice services and packet services as examples according to the method of the present invention.

Fig. 3 is a schematic flow diagram of requesting additional time slots from a spare resource pool in the Abis interface time slot resource allocation method in the mobile communication system according to the present invention.

Fig. 4 is a schematic flow chart of returning additional time slots to a spare resource pool according to the Abis interface time slot resource allocation method in the mobile communication system of the present invention.

Fig. 5 is a block diagram of an Abis interface time slot resource allocation device in the mobile communication system disclosed by the present invention.

Detailed ways

The present invention will be further elaborated below in conjunction with the accompanying drawings.

Fig. 2 is a schematic diagram illustrating the dynamic use of additional time slots by various services by taking voice services and packet services as examples according to the method of the present invention. As shown in Figure 2, Abis interface time slot resources are divided into primary time slots and backup resource pools. The voice channels FR and HR channels of the wireless interface are mapped to the main time slot A of the Abis interface, and the remaining idle time slots are used as It exists in the spare resource pool A' with time slots attached. When a certain type of service in the system needs more time slots, no matter what kind of service it is, it will uniformly request to the backup resource pool A'. If the voice channel is congested to a certain extent, the capacity of the voice channel needs to be increased, that is, one FR voice channel on the wireless port is converted into two HR voice channels, or for packet services, when the wireless environment meets the conditions of good enough transmission quality, the system decides to When the wireless channel corresponding to point A is converted to MCS-3 or above, it will request additional time slots from the reserve resource pool; among them, set the application priorities of various services, such as voice services and packet services, so that the reserve resources The pool can meet the needs of each business in turn according to the priority of each business.

Fig. 3 is a schematic flow diagram of requesting additional time slots from a spare resource pool in the Abis interface time slot resource allocation method in the mobile communication system according to the present invention. In Fig. 3, taking a channel that needs to increase the time slot attached to the Abis interface as an example, how the system implements the expansion of the time slot of the Abis interface is specifically described, which mainly includes the following steps:

Step S31: The system pre-sets point A of the Abis interface as the main time slot, that is, corresponding to a wireless channel, and sets the remaining idle time slots as a backup resource pool;

Step S32: Determine whether a certain type of service in the system needs more Abis interface time slots to provide more services. For example, when the voice channel congestion reaches a certain level, it is necessary to increase the voice channel capacity, that is, convert one FR voice channel of the wireless port into two HR Voice channel, or for packet services, when the wireless environment meets the conditions of good enough transmission quality, the system decides to convert the wireless channel corresponding to point A to MCS-3 and above, and execute step S33 if necessary;

Step S33: request allocation of one or more additional time slots from the reserve resource pool;

Step S34: The reserve resource pool decides whether to allocate according to the priority of the application and the idleness of the reserve resources. If it is rejected, the allocation fails and the process ends; if the allocation gets the time slot A' point, execute step S35 and set its status to "Allocated", the purpose is to prevent the time slot from being reallocated by other wireless channels;

In step S36, the corresponding relationship between the wireless channel and points A and A' is sent to the base station sending and receiving station, so far the whole operation process ends normally.

Fig. 4 is a schematic flow chart of returning additional time slots to a spare resource pool according to the Abis interface time slot resource allocation method in the mobile communication system of the present invention. In Figure 4, taking a wireless channel that no longer needs the time slot attached to the Abis interface as an example, how the system implements the return of the time slot attached to the Abis interface is specifically described, which mainly includes the following steps:

Step S41: the system has used the main time slot A point and the additional time slot A' point on the Abis interface;

Step S42: When a certain type of service in the system no longer needs too many Abis interface time slot resources, such as after the voice service is greatly reduced, or when the wireless environment deteriorates, the packet service is changed from using MCS-3 coding and above to using MCS- 1 code or MCS-2 code, notify the backup resource pool to recycle resources;

Step S43: The standby resource pool reclaims the attached time slot A' point;

Step S44: the state of the reclaimed time slot A' point is set to "unallocated" state, the purpose is to make the time slot redistributed by other wireless channels;

Step S45: Send the relationship that the wireless port service channel no longer corresponds to the attached time slot A' point to the base transceiver station, and the entire operation process ends normally.

Fig. 5 has provided the block diagram of the best embodiment of the device for allocation of Abis interface time slot resources according to the mobile communication system of the present invention, wherein, Abis interface 520 is arranged between base station controller 510 and base transceiver station 580, Abis The interface 520 is divided into multiple time slots with the smallest slot as the basic unit. As shown in the figure, in the Abis interface time slot resource allocation device of the present invention, it also includes: a main time slot and a standby resource pool determination module 530, which uses the time slot of the Abis interface 520 corresponding to the wireless port service channel as The main time slot; and the remaining idle time slots of the Abis interface 520 are used as a spare resource pool, and the time slots in the spare resource pool are supplementary time slots. Priority setting module 540, which determines the priority of each service application time slot provided by the system, but when simplifying the processing, the priority of various service application time slots provided by the system can be set to be the same. Additional time slot request module 550, which judges whether a certain type of service in the system needs more Abis interface time slot resources, and applies for additional time slots from the spare resource pool when necessary. Additional time slot providing module 560, when each service of the system applies for additional time slots from the reserve resource pool, it determines whether to provide additional time slots according to the situation of the reserve resources, and when it is determined to provide additional time slots, then determines according to the priority of the business Provides the order of the attached slots. When the additional time slot providing module 560 allocates an additional time slot in the spare resource pool to a class of business, the additional time slot is set to the state of "distributed", and notifies the base transceiver station 580 of the wireless interface service channel and Abis interface with time slot correspondence. Attached time slot recovery module 570, when the business of the system no longer needs too many Abis interface time slots, it reclaims the additional time slots provided to it to the standby resource pool for use, and sets it to "unallocated" state , and the wireless port traffic channel is no longer corresponding to the additional time slot and delivered to the base transceiver station 580 .

The implementation effect produced by using the method or device of the present invention is illustrated below by way of example:

Taking a general station type S3/3/3 (that is, a site with 3 cells, and each cell has 3 carrier frequencies), for voice service and packet service as an example, each cell is generally configured to support 18 FR voice service channels, 4 Packet traffic channel, such that the 3 cells are fixedly allocated (18+4)*3=66 Abis interface circuit time slots (16kbit/s), and the Abis interface time slots used for control signaling in such a station type are at least 10 indivual. The total number of time slots provided by a pair of Abis interface E1 transmission is 128, and 4 time slots are used for clock synchronization. In this way, only 128-66-10-4=48 can be used as spare resources in the end. Assuming that half of the 48 free time slots are fixedly allocated for HR voice services and half are used for packet services, then the maximum voice channel supported is 18*3+24=78, and the maximum total number of time slots that can be used for packet services is 4* 3+24=36. And if use the present invention, then idle time slot can be used for supporting voice service or packet service at most at most, the maximum voice channel supported like this is 18*3+48=102, the total time slot number that can be used for packet service at most is 4 *3+48=60.

Table 2

use the invention The maximum voice channel provided (HR+FR) maximum packet traffic time slot Original invention 78 36 the invention the invention 102 60 Capacity increase (%) 30.8 66.7

It can be seen from Table 2 that in the case of limited reserve circuit resources of the Abis interface, the algorithm of the present invention can maximize resource utilization according to actual service requirements.

Industrial applicability

The present invention is mainly used in the GSM mobile communication system, by dividing the time slot resource of the Abis interface into the main time slot and the spare resource pool, and making the spare resource pool share and fully considering the allocation according to the real-time needs of all the services of the system, thereby maximizing The time slot resource utilization rate of the Abis interface is greatly improved, which can better meet the service requirements.

Claims (11)

1, a kind of in the Abis interface of mobile communication system the method for dynamic assignment transmission time slot, it is characterized in that, comprise the steps:

Step 1 is base unit with the Abis interface land circuit with minimum time slot, make wireless port service channel of part and part A bis interface time slot set up corresponding relation, and this time slot is set to main time slot; The part or all of idle time slot of Abis interface is set to the standby resources pond again, and the time slot in the described standby resources pond is attached time slot;

Step 2 when the more Abis interface time slot of each service needed of system, is applied for attached time slot to described standby resources pond, and whether decision provides attached time slot according to the standby resources situation in described standby resources pond;

Step 3 when the business of system no longer needs too much Abis interface time slot, will discharge shared attached time slot, and it is stand-by to return the standby resources pond.

2, method according to claim 1 is characterized in that, comprises also that between step 1 and step 2 one is provided with the step of the attached time slot priority of each professional application of system; In described step 2, when determining attached time slot is provided, described standby resources pond further provides the order of attached time slot according to each professional priority decision.

3, method according to claim 2 is characterized in that, the priority that the attached time slot of all kinds of professional applications of described system is set is identical.

4, according to claim 1,2 or 3 described methods, it is characterized in that, when system gives a class business with the attached time slot allocation in the described standby resources pond, this attached time slot is set to the state of " distributing ", and with the corresponding relation informing base station transceiver station of wireless port service channel and the attached time slot of Abis interface.

5, method according to claim 1 and 2, it is characterized in that, in described step 3, it is set to " unallocated " state when the attached time slot that system recoveries discharged, and wireless port service channel no longer is issued to base transceiver station with this attached time slot corresponding relation.

6, method according to claim 4, it is characterized in that, in described step 3, it is set to " unallocated " state when the attached time slot that system recoveries discharged, and wireless port service channel no longer is issued to base transceiver station with this attached time slot corresponding relation.

7, a kind of in the Abis interface of mobile communication system the device of dynamic assignment transmission time slot, it comprises base station controller, base transceiver station and the Abis interface that connects base station controller and base transceiver station, it is characterized in that, described Abis interface is a base unit with minimum time slot, this device also comprises

One main time slot and standby resources pond determination module, the Abis interface time slot that is used for setting up corresponding relation with wireless port service channel is main time slot; And be the standby resources pond with all the other idle time slots of this Abis interface, the time slot in this standby resources pond is attached time slot;

One attached time slot request module is used for judging whether system's class business needs more Abis interface time interval resource, and applies for attached time slot to the standby resources pond when needed;

One attached time slot provides module, is used for each business when system when attached time slot is applied in the standby resources pond, determines whether to provide attached time slot according to the situation of standby resources;

One attached time slot recycling module is used for when the business of system no longer needs too much Abis interface time slot, and it is stand-by that the attached time slot that offers it is recovered to the standby resources pond.

8, device according to claim 7 is characterized in that, also comprises a priority level initializing module, is used for each professional priority of applying for attached time slot of determining that system provides; Described attached time slot provides module to determine to provide the order of attached time slot according to each professional priority in the time can providing attached time slot.

9, device according to claim 8 is characterized in that, described priority level initializing module is identical with the priority level initializing of the attached time slot of all kinds of professional application that system provides.

10, device according to claim 7, it is characterized in that, described attached time slot provide module with the attached time slot allocation in the standby resources pond to a class business in, this attached time slot is set to the state of " distributing ", and with the corresponding relation informing base station transceiver station of wireless port service channel and the attached time slot of Abis interface.

11, device according to claim 7 is characterized in that, described attached time slot recycling module, and it is set to " unallocated " state and the relation that wireless port service channel is no longer corresponding with this attached time slot is issued to base transceiver station when reclaiming attached time slot.

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