CN102651896A

CN102651896A - Automatic expansion method and device for packet switching channel

Info

Publication number: CN102651896A
Application number: CN2011100440169A
Authority: CN
Inventors: 吴成涛
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2011-02-23
Filing date: 2011-02-23
Publication date: 2012-08-29
Anticipated expiration: 2031-02-23
Also published as: CN102651896B

Abstract

The invention provides an automatic expansion method for a packet switching channel. The automatic expansion method comprises the following steps of: when a circuit switching (CS) channel is released, judging whether a preset expansion condition of the packet switching (PS) channel is met, and if so, initiating PS channel expansion. The invention also discloses an automatic expansion method for the packet switching channel. The invention has the advantages that after resources of the CS channel are released, PS channel expansion is carried out, and then a PS user uses channels as more as possible in the maximum multi-time-slot capability range, so that the speed of the PS service is increased, and the user satisfaction is improved.

Description

Automatic expansion method and device for packet switching channel

Technical Field

The present invention relates to a mobile communication system, and in particular, to a PS (Packet Switch) channel auto-extension method and apparatus.

Background

In GSM (Global System for Mobile Communications), the transmission medium between a Mobile subscriber and a base station is free space. In the GSM frequency band, there are noise, multipath, co-channel interference, etc. To combat these noise and interference, efficient channel coding, interleaving, and modulation schemes are employed in the radio interface section. The channel occupied by the user communication adopts two modes of frequency division and time division. The GSM frequency band is divided into small sections every 200KHz, each small section is a frequency channel, in each frequency channel, time division multiplexing is adopted and divided into 8 time slots, and each user of the traditional voice service occupies one time slot.

The GPRS (General Packet Radio Service) system provides end-to-end Packet-switching and transmission technology-based mobile data services for users. By means of the multi-time slot binding and high-speed coding scheme, wireless resources and network ground resources can be effectively utilized, and the method is particularly suitable for burst data services with long time and small flow. Like the GSM system, the GPRS system divides a carrier into 8 time slots, constituting 8 basic time division channels. Since GPRS is designed with the goal of co-existence with the original GSM voice transmission, in a GPRS-enabled GSM cell, there may be some physical channels (timeslots) used for voice transmission and other physical channels used for GPRS packet data transmission. And some GPRS signaling flows will be performed on the CS channel, such as packet system message broadcast, packet access, resource allocation, etc.

The major difference between the GPRS service (also called PS service) and the traditional voice (also called Circuit Switch, CS for short) service in the radio channel allocation strategy is that a GPRS user can simultaneously occupy multiple radio timeslots and a radio channel can simultaneously be occupied by multiple users according to the multi-timeslot capability of the GPRS user. In the conventional voice service, one user can only occupy one wireless channel, and one wireless channel can only be occupied by one user (after HR (half rate voice communication) technology is adopted, one wireless channel can be occupied by two users at most).

The wireless channel attribute can be configured into a dynamic static channel and a dynamic channel, and if the wireless channel attribute is configured into the static channel, the wireless channel attribute can only perform PS or CS. The dynamic channel can dynamically adjust the channel attribute to be a CS or PS channel according to the type of the currently accessed service. In order to fully utilize radio resources and simplify configuration management, a dynamic channel configuration method is generally adopted. With the wide use of GPRS/EDGE (enhanced data Rate for GSM Evolution), the number of users of mobile phones in the current network is increasing, the wireless channel resources are more and more strained, and in order to fully ensure that the quality of the traditional voice service is not affected, the priority of CS users is higher than that of PS users, and when necessary, the CS service can seize the channel resources of PS users, and the call completing Rate of CS service is ensured in a way of sacrificing the PS service Rate. The satisfaction of PS users is to be improved.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a method and a device for automatically expanding a PS channel, so as to improve the satisfaction degree of a user.

In order to solve the above problem, the present invention provides an automatic extension method for packet switched channels, comprising:

when a Circuit Switching (CS) channel is released, whether a preset Packet Switching (PS) channel expansion condition is met or not is judged, and if yes, PS channel expansion is initiated.

Further, the method may further have the following characteristics that the meeting of the preset PS channel extension condition includes:

the released CS channel is a dynamic channel, the available channel of the cell idle CS meets the preset condition, and the multi-slot capability of the PS user adjacent to the released CS channel is not met.

Further, the above method may further have the following features, and the method further includes: before judging whether a preset PS channel expansion condition is met, migrating users of other CS channels to the released CS channels;

the meeting of the preset PS channel expansion condition comprises:

the migrated CS channel is a dynamic channel, the available channel of the cell idle CS meets the preset conditions, and the multi-slot capability of the PS user adjacent to the migrated CS channel is not met.

Furthermore, the method can also have the following characteristics that before the users of other CS channels are migrated to the released CS channel, whether the continuity of the PS available channel after the CS channel migration is better than that before the CS channel migration is judged, and if so, the CS channel migration is carried out.

Further, the method may further have the following characteristics that the cell idle CS available channel satisfies the preset condition:

the idle CS available channel is more than or equal to a preset minimum reserved idle channel threshold; the ratio of the idle CS available channel to the total CS available channel is more than or equal to a preset cell channel idle degree threshold value;

or,

the idle CS available channel is more than or equal to a preset minimum reserved idle channel threshold; and is

The ratio of the idle CS available channel to the total CS available channel is smaller than a preset cell channel idle degree threshold value, the number of idle full-rate service channel time slots is larger than a preset minimum reserved idle channel threshold value, the average number of CS users in continuous N time windows is reduced, N is larger than 1, and the length of the time window is a preset value.

The invention also provides an automatic expanding device of the packet switching channel, which comprises a CS user module and a control module, wherein:

the CS user module is configured to: when a Circuit Switching (CS) channel is released, informing a control module to release corresponding CS resources;

the control module is used for: and when the notification is received, judging whether a preset Packet Switching (PS) channel expansion condition is met, and if so, initiating PS channel expansion.

Further, the above apparatus may further have the following features, and the control module includes a resource allocation management module and a PS user module, where:

the resource allocation management module is used for judging whether the released CS channel is a dynamic channel or not and whether a cell idle CS available channel meets a preset condition or not when receiving the notification, and notifying a PS user module of a judgment result;

and the PS user module is used for judging whether the multi-time slot capability of the PS user adjacent to the released CS channel is met, if the multi-time slot capability of the PS user adjacent to the released CS channel is not met, the released CS channel is a dynamic channel, and the available channel of the cell idle CS meets the preset condition, the PS channel expansion is initiated.

the resource allocation management module is configured to: when receiving the notification, migrating users of other CS channels to the released CS channel, judging whether the migrated CS channel is a dynamic channel or not, judging whether an idle CS available channel of a cell meets a preset condition or not, and notifying the PS user module of a judgment result;

the PS user module is configured to: and the PS channel expansion module is used for judging whether the multi-time slot capability of the PS users adjacent to the migrated CS channel is met, if the multi-time slot capability of the PS users adjacent to the migrated CS channel is not met, the migrated CS channel is a dynamic channel, and the available channel of the idle CS of the cell meets a preset condition, and then the PS channel expansion module initiates the PS channel expansion.

Further, the apparatus may further have a feature that the resource allocation management module is further configured to determine, before migrating the user of the other CS channel to the released CS channel, whether the continuity of the PS available channel after the CS channel migration is better than that before the CS channel migration, and if so, perform the CS channel migration.

Further, the apparatus may further have the following characteristics that the cell idle CS available channel satisfies the preset condition:

or,

The channel automatic expanding method provided by the invention expands the PS channel when the CS channel is released and the channel expanding condition is satisfied, so that the PS user uses as many channels as possible within the maximum multi-time slot capability range, thereby improving the speed of the PS service and the user satisfaction.

Drawings

FIG. 1 is a basic flow diagram of the present invention;

fig. 2 is a schematic diagram of channel occupancy at CS channel release (scenario 1);

fig. 3 is a schematic diagram of channel occupancy after PS channel expansion (scenario 1);

fig. 4 is a schematic diagram of channel occupancy at CS channel release (scenario 2);

fig. 5 is a schematic diagram of the channel occupancy after PS channel expansion (scenario 2).

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

After the CS service is released, the PS service can occupy more available resources, and the PS channel is expanded in a timely manner, thereby greatly increasing the PS rate. The invention provides a method for supporting PS dynamic channel expansion, which can use as many channels as possible in the maximum multi-time slot capacity range after CS channel resources are released for users whose maximum multi-time slot capacity can not be satisfied because of insufficient channel resources, thereby improving the speed of PS service. The BSC (Base Station Controller) supports the CS to seize the dynamic PS channel when the channel is insufficient. The preempted channel is typically located at the edge of the channel group. After a PS channel is preempted by a CS user, if the preempted channel is one occupied by a certain PS user (assuming that a 4+1 user is preempted, the preempted channel becomes 3+ 1). When the CS channel is released, the channel is reconverted to a PDCH channel so that the PS user can use as many channels as possible (re-spread from 3+1 to 4+1) within the maximum multi-slot capability, thereby increasing the rate. In addition, even if preemption does not occur, the PS channel occupation by the CS user will cause the multi-slot capability of the PS user to be not satisfied, so the PS channel expansion is also required after the CS user is released. For example, the channel used by the PS user is 2+1 or 1+1, and when the adjacent CS user releases, it will automatically extend to the 4+1 channel.

An OMCR (Operation and Maintenance Center, Radio) configures a Channel attribute of a cell to be a dynamic attribute, CS and PS services can both use a dynamic Channel, a CS service occupation Channel is a Full rate Traffic Channel (TCH/F), and a PS service occupation Channel is converted into a Packet Data Channel (PDCH).

The invention provides an automatic PS channel expansion device, which comprises a CS user module and a control module, wherein:

the CS user module is configured to: when the CS channel is released, the control module is informed to release the corresponding CS resource;

Wherein the control module further comprises a PS user module and a resource allocation management module, wherein:

Or,

the resource allocation management module is configured to: when receiving the notification, migrating users of other CS channels to the released CS channel, judging whether the migrated CS channel is a dynamic channel or not, judging whether an idle CS available channel of a cell meets a preset condition or not, and notifying the PS user module of a judgment result; before carrying out channel migration, judging whether the continuity of the PS available channel after carrying out CS channel migration is better than that before carrying out CS channel migration, if so, carrying out CS channel migration;

the PS user module is configured to: and the PS channel expansion module is used for judging whether the multi-time slot capability of the PS users adjacent to the migrated CS channel is met, if the multi-time slot capability of the PS users adjacent to the migrated CS channel is not met, the migrated CS channel is a dynamic channel, and a cell idle channel meets a preset condition, and then the PS channel expansion module initiates PS channel expansion.

The cell idle channel meeting the preset conditions comprises:

or,

One specific embodiment of the apparatus is described below.

When releasing CS service, CS user module informs resource distribution management module to release corresponding CS resource;

the resource allocation management module judges whether a cell idle channel meets a preset condition, if so, judges whether a currently released CS channel is a dynamic channel, judges whether a CS user on the dynamic channel can initiate channel migration (the CS user is migrated to an edge channel of a continuous channel to ensure the continuity of the residual dynamic channel), specifically, judges whether the continuity of a PS available channel is better than that before migration after the CS channel migration is performed, if so, initiates the CS migration, and notifies the PS user module when the CS migration is not needed, or notifies the PS user module after the CS migration is initiated; when channel migration is carried out, the channel migration method is to

And after receiving the notification, the PS user module judges whether the multi-slot capability of the current PS user can be met, and if not, the PS user module applies for expanding the PS channel to the resource allocation management module. After completing the BSC internal connection and BTS channel activation for the newly allocated channel, the PS user module informs the MS (Mobile Station) to use the new timeslot set.

As described above, since the priority of the CS service is higher than that of the PS service, the CS service can unconditionally seize the dynamic PD channel, so if no effective limitation is made on the initiation of the PS channel expansion function, the CS will continuously seize the PS service, and the PS service will try to expand immediately after the CS is released, which easily causes the performance of the system to decrease and is not reimbursed, in order to avoid such a phenomenon, the CS service model of the existing network is analyzed, and according to the CS service concentration period (the CS service is concentrated in two time periods of noon and evening every day in the existing network) and the characteristics of the system itself, the following conditions are proposed for the initiation of the PS channel expansion:

1. and setting a minimum reserved idle channel threshold value of the cell CS, and if the number of idle CS available channels is less than the minimum reserved idle channel threshold value, not initiating PS channel expansion. The parameter can be configured by OMCR according to the current network service requirement, and the call completing rate of CS service is fully ensured not to be influenced.

2. Setting a cell channel idle degree threshold, if the ratio of idle CS available channels to total CS available channels in a cell is greater than or equal to the cell channel idle degree threshold, then PS channel expansion can be initiated, if the ratio is less than the cell channel idle degree threshold, but the idle TCH/F time slot number is greater than the minimum reserved idle channel threshold, then taking preset time (such as five minutes) as a time window, and taking the statistical value of the average number of CS users of the latest continuous N time windows. If the value is decreasing for N consecutive time windows, PS channel extension can be initiated, otherwise it cannot be initiated, and the value of N can be set as needed, for example, to 3. This parameter may also be configured by the OMCR according to the current network service requirements. Setting this condition can prevent the channel resources from being repeatedly preempted between the PS and the CS.

3. The carrier frequency must have the current multi-slot capability of the PS user not satisfied to initiate the PS channel expansion.

4. The released CS channel or the channel that triggered the release of the CS migration must be a dynamic channel. The conditions that can trigger CS migration must be such that the released CS channel is further away from the PS channel group than the CS channel to be migrated.

The above judgment sequence of the conditions 1, 2, 3, and 4 is not limited in the present invention, for example, the conditions 1, 2, and 4 may be judged first, and when the conditions 1, 2, and 4 are satisfied, whether the condition 3 is satisfied may be judged; or judging the condition 3 first, and judging whether the conditions 1, 2 and 4 are met after the condition 3 is met, thereby judging whether to initiate the PS channel expansion. Alternatively, the determination may be performed in other sequences, which is not limited in the present invention.

The invention provides an automatic expanding method of a packet switching channel, which comprises the following steps:

Wherein, the meeting the preset packet switching channel expansion condition comprises:

Wherein the method further comprises: before judging whether a preset Packet Switching (PS) channel expansion condition is met, migrating users of other CS channels to the released CS channels;

the meeting of the preset packet switching channel expansion condition comprises the following steps:

And before migrating users of other CS channels to the released CS channels, judging whether the continuity of the PS available channels after the CS channels are migrated is better than that before the CS channels are migrated, and if so, migrating the CS channels.

Wherein, the cell idle CS available channel meeting the preset conditions comprises:

or,

The invention is further illustrated by the following specific examples.

As shown in fig. 1, includes:

releasing a CS channel;

judging whether the idle CS available channel of the cell meets a preset condition or not;

if yes, judging whether the released CS channel is adjacent to a PS channel; if yes, judging whether the PS user meets the multi-time slot capability, and if not, initiating PS channel expansion;

when the released adjacent channel of the CS channel is occupied by the CS, judging whether to initiate CS migration, after the CS migration is successful, judging whether the PS user adjacent to the migrated channel meets the multi-slot capability, if not, initiating PS channel expansion.

As shown in fig. 2 and 3, scenario 1 is illustrated which is capable of triggering the channel extension of the present invention.

The channel occupancy before channel expansion is shown in fig. 2.

Next to the CS channel are PS1 users and PS2 users' PS channels, and the multi-slot capability of PS1 users and PS2 users can be supported to 4+ 1. This situation is simple, after the CS channel is released and notified, the peripheral PS users check that their own multi-slot capability is not satisfied, and directly apply for an extension channel to the resource allocation management module.

After the TS5 is released, the extension channel searched by the PS1 user is TS4-TS 5; the extension channel found by the PS2 user is TS 5. PS1 user has been reassigned TS4-TS7, PS2 user has been reassigned TS2-TS 5.

The channel occupation situation after the channel expansion is completed is shown in fig. 3.

As shown in fig. 4 and 5, scenario 2 is illustrated which is capable of triggering the channel extension of the present invention.

The channel occupancy before channel expansion is shown in fig. 4.

There is no direct PS user beside the released CS channel TS0, but the multi-slot capability of the middle PS user 1 is not satisfied, and there is an idle channel on the current carrier frequency, at this time, the CS user module is first notified, so that the CS user on TS1 is migrated to the time slot TS0, after the resource migration, the PS user module is notified to initiate channel expansion to the PS user 1, and the PS user 1 reallocates TS1-TS 3.

It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A method for packet switched channel auto-expansion, comprising:

2. The method of claim 1, wherein: the meeting of the preset PS channel expansion condition comprises:

3. The method of claim 1, wherein the method further comprises: before judging whether a preset PS channel expansion condition is met, migrating users of other CS channels to the released CS channels;

the meeting of the preset PS channel expansion condition comprises:

4. The method according to claim 3, wherein before migrating users of other CS channels to said released CS channel, it is further determined whether the continuity of PS available channel after CS channel migration is better than that before CS channel migration, and if so, CS channel migration is performed.

5. The method of claim 2, 3 or 4, wherein the cell idle CS available channel satisfying a preset condition comprises:

or,

6. An apparatus for automatic extension of packet switched channels, the apparatus comprising a CS user module and a control module, wherein:

7. The apparatus of claim 6, wherein the control module comprises a resource allocation management module and a PS user module, wherein:

8. The apparatus of claim 6, wherein the control module comprises a resource allocation management module and a PS user module, wherein:

9. The apparatus of claim 8, wherein the resource allocation management module is further configured to determine whether the continuity of the PS available channel after the CS channel migration is better than that before the CS channel migration before migrating the user of the other CS channel to the released CS channel, and if so, perform the CS channel migration.

10. The apparatus of claim 7, 8 or 9, wherein the cell idle CS available channel satisfying a preset condition comprises:

or,