WO2006069470A1 - A METHOD OF DYNAMICALLY ASSIGNING TRANSMISSION TIME SLOT IN Abis INTERFACE OF MOBILE COMMUNICATION SYSTEM - Google Patents

Abstract

The present invention discloses a method of dynamically assigning transmission time slot in Abis interface of mobile communication system, which includes the following steps: the Abis interface land circuit of the system making the least time slot as basic unit, and determining the main time slot and standby resource pool, wherein the time slots of standby resource pool are additional time slots; determining the priority level of various services provided by system applying for additional time slots; when certain service of system needs more Abis interface time slots, applying for additional time slots of standby resource pool, and standby resource pool determining whether it provides additional time slots or not based on priority level of the service and condition of standby resource by now; when certain service does not need excessive time slots, releasing said provided additional time slots, and giving back standby resource pool for to use. On the other hand, the present invention provides a device of realizing said method. The use of the present invention can furthest improve utilization ratio of time slot resource of Abis interface and further satisfy the requirement of service.

Description

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

 The present invention relates to the field of mobile communication technologies, and in particular, to a method for dynamically allocating transmission time slots for Abis interfaces in a mobile communication system for different service rates. Background technique

 Communication systems are playing an increasingly important role in social life. People's demand for communication is driving the rapid development of communication system technology, especially mobile communication systems, from traditional GSM systems to GPRS systems (General Packet Radio Service, universal Packet radio system) Rapid evolution. In order to provide higher communication bandwidth, meet the requirements of various types of real-time packet services, and develop the EGPRS system (Enhance GPRS); on the other hand, due to the continuous growth of the GSM user group, operators in order to increase investment without excessive investment It can provide voice services for more users, and there is an increasing demand for HR (Half-Rate) voice services. In particular, the system is required to automatically convert FR (Full-Rate) channels into HR channels for different time periods. Support for more channels or combine HR channels into FR channels to provide better call quality.

 The GSM base station subsystem generally adopts the structure shown in FIG. In Fig. 1, the BSC is a base station controller, the BTS is a base transceiver station, and the CCU is a channel coding unit. The mapping of the terrestrial circuit Abis interface between the wireless port (Um), the BTS and the BSC is completed by the base transceiver station. The GSM system generally uses 16kbit/s circuit time slots as the minimum unit on the Abis interface. Thus, in the original GSM system, since the traffic channel of the wireless port carries the voice service or the packet service, the rate does not exceed 16 kbit/s, so the channel of the wireless port and the 16 kbit/s time slot of the Abis interface are one. A mapping comes over. However, in the EGPRS system, when the wireless port channel is used for packet services, the coding and modulation modes are different, and the rates are also different, as shown in Table 1. When the MCS-3~MCS-9 encoding mode is adopted, the channel of one wireless port is required to correspond to the time slot of 2~5 Abis interfaces.

 Table 1

 Modulation coding scheme

 [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 For this, the current better solution is to first set a packet traffic channel of the wireless port with a

The circuit time slot of the Abis interface corresponds, and at the same time, a part of the time slot is taken out from the Abis interface as a backup resource. When the required bandwidth of the traffic channel exceeds one Abis interface circuit time slot, one or more of the spare resources are taken out. The packet traffic channel of this wireless port corresponds. For example, the patent application number is

01126612. 0 Chinese Patent "A general packet radio service data frame signal transmission method" is handled in this way for the CS-3 and CS-4 packet services in the GPRS service.

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

 For the HR voice service, one traffic channel of the original wireless port can be converted into two service channels supporting HR. Since the actual 8 kbit/s bandwidth can carry one HR voice service, the minimum unit time of the circuit slot of the general Abis interface is 16 kbit. /s, so the current practice of supporting HR is: When a traffic channel that originally supports the FR of the wireless interface is converted into two traffic channels supporting HR, the Abis interface is required to have two time slots; Fixed for the two HR voice services, which will greatly waste the Abis interface resources. At the same time, because some spare time slot resources of the Abis interface serve as backup resources for the packet service, the Abis interface time slot resources are very tight and can be converted into HR. The channel is thus also greatly limited.

As can be seen from the above, the prior art considers various types of services, such as voice services and packet services, to be considered separately, resulting in a defect in the utilization of time slot resources of the Abis interface. Invention disclosure It is an object of the present invention to provide a method for sharing and dynamically allocating spare time slot resources of an Abis interface, thereby more effectively and fully utilizing Abis interface resources.

 To achieve the above objective, the present invention divides the Abis interface time slot resource into two parts: a primary time slot and an alternate resource pool. The primary time slot refers to mapping the original wireless port traffic channel to a single time slot of the Abis interface, and the standby resource pool is Refers to all time slots remaining on the Abis interface, and defines the time slots in the spare resource pool as time slots. When a certain type of service of the system requires more time slots, the service is uniformly requested from the standby resource pool regardless of the service. The application priority of the voice service and the packet service is set, so that the backup resource pool can meet the requirements of each service in turn according to the priority of each service.

 Based on this, in one aspect, the present invention provides a method for dynamically allocating transmission time slots in an Abis interface of a GSM system, comprising the steps of:

 Step 1: The Abis interface ground circuit is set to a minimum time slot as a basic unit, and a part of the wireless port traffic channel is associated with a part of the Abis interface time slot, and the time slot is set as a primary time slot; and then the Abis interface is partially or completely The idle time slot is set as an alternate resource pool, and the time slot in the spare resource pool is a time slot;

 Step 2: When each service of the system needs more Abi s interface time slots, apply to the standby resource pool for a time slot, and the standby resource pool determines whether to provide a time slot according to the standby resource condition; Step 3: When the service of the system no longer needs too many Abis interface time slots, the occupied time slots will be released and the standby resource pool will be used.

 According to the method of the present invention, a step of setting a priority of each service request with a time slot is further included between step 1 and step 2; in the step 2, when determining to provide a time slot, the standby resource The pool further provides an order of time slots according to the priority of each service.

 According to the method of the present invention, when the processing is simplified, the priority of the time slots of the various service applications of the system is set to be the same.

 According to the method of the present invention, while the system allocates a time slot in the spare resource pool to a type of service, the time slot is set to the "assigned" state, and the wireless port channel and the Abis port are The corresponding relationship with 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 time slot, it is set to an "unallocated" state, and the wireless port traffic channel is no longer sent to the base station corresponding to the attached time slot. Transceiver station.

In another aspect, the present invention provides a device for time slot resource allocation of an Abis interface in a GSM system, It includes a base station controller, a base transceiver station, and a base station controller and a base transceiver station

An Abis interface, wherein the Abis interface is based on a minimum time slot; the device further includes: a primary time slot and an alternate resource pool determining module, configured to allocate an Abis interface time slot corresponding to the wireless port traffic channel as a primary time slot, The remaining idle time slots of the Abis interface are standby resource pools, and the time slots in the standby resource pool are time slots; a time slot requesting module is configured to determine whether a certain type of service of the system needs more Abis interface time slot resources. And applying a time slot to the backup resource pool when needed; a time slot providing module, configured to determine whether to provide a time slot according to the condition of the standby resource when each service of the system applies for a time slot to the backup resource pool; The slot recovery module is configured to reclaim the time slot provided to the standby resource pool for use when the service of the system no longer needs too many Abis interface time slots.

 The device according to the present invention further includes a priority setting module, configured to determine a priority of a time slot of each service request provided by the system; and the time slot providing module provides priority according to each service when the time slot can be provided The level determination provides an order of time slots.

 According to the apparatus of the present invention, when the processing is simplified, the priority setting module sets the priority of each type of service request slot attached by the system to be the same.

 According to the apparatus of the present invention, the time slot providing module sets a time slot in the spare resource pool to a type of service, sets the time slot to an "allocated" state, and notifies the base station to send and receive. The correspondence between the wireless channel of the station and the time slot attached to the Abis port.

 According to the device of the present invention, the time slot collection module is set to an "unallocated" state when the time slot is reclaimed, and the wireless port traffic channel is no longer sent to the base station transceiver corresponding to the time slot. station.

 Since the alternate resource pool is based on the ground circuit of each Abis interface, each time slot of the spare resource pool of the same terrestrial circuit can be dynamically used with the primary time slot in the terrestrial circuit.

 After adopting the above solution, the present invention has the following advantages:

 1. Greatly improve the utilization of ground resources and maximize the system requirements;

 2. Sharing the Abis interface ground resources according to the service priority, improving the flexibility of resource sharing and better meeting user requirements;

 3. Provide as many HR voice services as possible on the basis of existing hardware. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of the location of the Abis interface in a mobile communication system FIG. 2 is a schematic diagram showing the dynamic use of time slots of various services according to the method of the present invention, taking voice service and packet service as an example.

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

 4 is a flow chart showing the return of a time slot to an alternate resource pool in the Abis interface time slot resource allocation method in the mobile communication system according to the present invention.

 Figure 5 is a block diagram of an Abis interface time slot resource allocation apparatus in a mobile communication system according to the present invention. The best way to implement the invention

 The invention is further illustrated below in conjunction with the drawings.

 2 is a schematic diagram of a method for dynamically using various time slots in various types of services, taking voice services and packet services as an example. As shown in FIG. 2, the Abis interface time slot resource is divided into a primary time slot and a spare resource pool, wherein the voice channel FR and HR channel of the wireless interface are mapped to the time slot of the Abis interface as the primary time slot A, and the remaining idle time slots are used. The time slot is attached to the spare resource pool A'. When a certain type of service of the system requires more time slots, no matter what kind of service, it uniformly requests the backup resource pool A'. If the voice channel congestion reaches a certain level, the voice channel capacity needs to be increased, that is, one FR voice channel of the wireless port is converted into two HR voice channels, or for the packet service, when the wireless environment satisfies the condition that the transmission quality is good enough, the system decides that When the wireless channel corresponding to point A is converted to the MCS-3 and the above mode, the time slot is requested to be attached to the spare resource pool; wherein, the application priority of various services, such as voice service and packet service, is set, so that the standby resource is used. The pool can meet the requirements of each service in turn according to the priority of each service.

 3 is a schematic flow chart of requesting a time slot from a spare resource pool in an Abis interface time slot resource allocation method in a mobile communication system according to the present invention. In Figure 3, an Abis interface with a time slot is added as an example to illustrate how the system implements the expansion of the Abis interface time slot. The main steps are as follows:

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

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

 Step S33: Allocating one or more attached time slots to the standby resource pool request;

 Step S34: The standby resource pool determines whether to allocate according to the priority of the application and the idle resource idle condition. If the resource is rejected, the allocation fails, and the process ends. If the allocation receives the time slot A', the process proceeds to step S35, and the status is set to "allocated" to prevent the time slot from being redistributed by other wireless channels;

 Step S36: The corresponding relationship between the wireless channel and the A and A' points is sent to the base station transmitting and receiving station, and the entire operation process ends normally.

 4 is a flow chart showing the return of a time slot to an alternate resource pool in the Abis interface time slot resource allocation method in the mobile communication system according to the present invention. In FIG. 4, a wireless channel no longer requires an Abis interface with a time slot as an example, and specifically describes how the system implements the return of the Abis interface with a time slot, which mainly includes the following steps:

 Step S41: The system has used the primary slot A point and the attached slot A' point on the Abis interface; Step S42: When a certain type of service of the system no longer needs too many Abis interface time slot resources, such as a large decline for voice services After, or when the wireless environment deteriorates, the packet service is changed to use the MCS-3 code and the above to use the MCS-1 code or the MCS-2 code to notify the backup resource pool to recover the resource;

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

 Step S44: setting the status of the recovered time slot A' point to the "unallocated" state, so that the time slot can be redistributed by other wireless channels;

 Step S45: The wireless port service channel is no longer sent to the base transceiver station in the relationship corresponding to the time slot A', and the entire operation process ends normally.

Figure 5 is a block diagram showing a preferred embodiment of an apparatus for Abis interface time slot resource allocation in a mobile communication system in accordance with the present invention, wherein an Abis interface 520 is disposed between the base station controller 510 and the base transceiver station 580, Abis The interface 520 is divided into a plurality of slots by a minimum time slot as a basic unit. As shown in the figure, in the Abis interface time slot resource allocation apparatus of the present invention, the method further includes: a primary time slot and a spare resource pool determining module 530, which uses a time slot of the Abis interface 520 that associates with the wireless port traffic channel. The remaining time slot of the Abis interface 520 is used as a spare resource pool, and the time slot in the spare resource pool is a time slot. The priority setting module 540 determines the priority of each service application with a time slot provided by the system, but when the processing is simplified, the various service applications provided by the system may be attached. The priority of the time slots is set to be the same. The time slot requesting module 550 is configured to determine whether a certain type of service of the system needs more Abis interface time slot resources, and apply for a time slot to the standby resource pool when needed. The time slot providing module 560 is configured to determine whether to provide a time slot according to the condition of the standby resource when each service of the system applies for a time slot to the backup resource pool, and when determining to provide the attached time slot, determine according to the priority of the service. Provide an order of time slots. When the time slot providing module 560 allocates a time slot in the spare resource pool to a type of service, the time slot is set to the "allocated" state, and the base transceiver station 580 is notified of the wireless port channel and Abis. The corresponding relationship of the time slot is attached. A time slot recovery module 570 is provided. When the service of the system no longer needs too many Abis interface time slots, the time slot that is provided to it is recycled to the standby resource pool for use, and is set to an "unallocated" state. And the wireless port traffic channel is no longer sent to the base transceiver station 580 corresponding to the attached time slot.

 The following shows an example of the effect of the use of the method or device of the invention:

 For a general station type S3/3/3 (ie, one station, three cells, three carrier frequencies per cell), for voice services and packet services, for example, each cell is generally configured to support 18 FR voice traffic channels, 4 Packet traffic channel, such that 3 cells are fixedly allocated (18+4) *3=66 Abis interface circuit slots (16 kbit/s), such a station type Abis interface time slot for control signaling is at least 10 One. A pair of Abis interfaces E1 transmission provides a total of 128 time slots, and clock synchronization uses 4, so that only the final resources can be used as: 128-66- 10- 4=48. Assuming that 48 idle time slots are fixedly allocated for HR voice service and half is used for packet services, the maximum supported voice channel is 18*3+24=78, and the maximum number of time slots that can be used for packet services is 4*. 3+24=36. However, if the present invention is used, the maximum time slot of the idle time slot can be used to support the voice service or the packet service, so that the maximum supported voice channel is 18*3+48=102, and the maximum number of time slots that can be used for the packet service is

4*3+48-60

 Table 2

从表 2可以看出， 在 Abis接口备用电路资源有限的情况下， 本发明算法 可以针对实际业务的需求， 更大限度地提高资源利用率。 工业应用性

It can be seen from Table 2 that in the case that the standby circuit resources of the Abis interface are limited, the algorithm of the present invention can greatly improve the resource utilization rate for the actual service requirements. Industrial applicability

 The invention is mainly used in the GSM mobile communication system, and the time slot resources of the Abis interface are divided into the primary time slot and the standby resource pool, and the spare resource pool is shared and fully allocated according to the real-time needs of all services of the system, thereby maximizing the maximum The time slot resource utilization of the Abis interface is improved, and the service requirements can be better met.

Claims

Claim A method for dynamically allocating transmission time slots in an Abis interface of a mobile communication system, comprising the steps of:  Step 1: The Abis interface ground circuit is set to a minimum time slot as a basic unit, and a part of the wireless port traffic channel is associated with a part of the Abis interface time slot, and the time slot is set as a primary time slot; and then the Abis interface is partially or completely The idle time slot is set as an alternate resource pool, and the time slot in the spare resource pool is a time slot;  Step 2: When each service of the system needs more Abis interface time slots, apply for a time slot to the standby resource pool, and the standby resource pool determines whether to provide a time slot according to the standby resource condition; Step 3: When the system When the service no longer needs too many Abis interface time slots, the occupied time slots will be released and the standby resource pool will be used.  2. The method according to claim 1, wherein step 1 and step 2 further comprise the step of setting a priority of each service application with a time slot priority; in the second step, determining to provide When a time slot is attached, the spare resource pool further determines the order in which the time slots are provided according to the priority of each service.  3. The method according to claim 2, wherein the priorities of the time slots of the various service applications of the system are set to be the same.  The method according to claim 1, 2 or 3, wherein, when the system allocates a time slot in the spare resource pool to a type of service, the time slot is set to "self" The status of "allocation" is communicated to the base transceiver station by the correspondence between the wireless port channel and the Abis port attached time slot.  5. The method according to claim 1, 2 or 4, wherein in the step three, when the system reclaims the released time slot, it is set to an "unallocated" state, and the wireless port service is The channel is no longer sent to the base transceiver station corresponding to the attached time slot. 6. An apparatus for dynamically allocating transmission time slots in an Abis interface of a mobile communication system, comprising: 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 is configured with a minimum time slot as a basic unit, and the apparatus further includes: a primary time slot and an alternate resource pool determining module, configured to time the Abis interface time slot corresponding to the wireless port traffic channel as a primary time slot; The remaining idle time slots of the Abis interface are standby resource pools, and the time slots in the standby resource pool are attached time slots; A time slot requesting module is configured to determine whether a certain type of service of the system needs more Abis interface time slot resources, and apply for a time slot to the standby resource pool when needed;  a time slot providing module, configured to determine whether to provide a time slot according to the condition of the standby resource when each service of the system applies for a time slot to the standby resource pool;  A time slot recovery module is configured to reclaim the time slot provided to the standby resource pool for use when the service of the system no longer requires too many Abis interface time slots.  The device according to claim 6, further comprising a priority setting module, configured to determine a priority of a time slot of each service request provided by the system; The order in which the time slots are provided is determined according to the priority of each service when the time slot is provided.  The device according to claim 7, wherein the priority setting module sets the priority of the time slots of various service requests provided by the system to be the same.  The apparatus according to claim 6, wherein the time slot providing module sets the time slot of the spare resource pool to a type of service, and sets the time slot to The state of "allocation" is notified to the base transceiver station of the correspondence between the wireless port channel and the Abis port attached time slot.  10. The apparatus according to claim 6, wherein the time slot recovery module sets the time slot to "unallocated" when the time slot is recovered, and the wireless port traffic channel is no longer attached to the The time slot is correspondingly sent to the base transceiver station.