CN101048011B - Method for switchover of packet switching service at downlink double/multi-load transmission - Google Patents

Abstract

The invention discloses a method for switching the packet switching business of downlink double / multi-contained transmission. The core idea is that the network controls the mobile to shift from downlink double / multi-contained transmission to single-contained transmission before switching operation, and then, it switches for packet switching business in the mode of single packet switching. The instructions or the hidden requirements can ensure the network to control the mobile to leave downlink double / multi-contained transmission.

Description

Method for packet switching service switching under downlink dual/multi-carrier transmission

technical field

The present invention relates to the technical field of communication, in particular to a method for performing packet switching (PS, Packet Switching) service switching. the

Background technique

With the improvement of users' real-time requirements for General Packet Radio Service (GPRS), the concept of PS domain switching in GPRS is proposed in the existing standard. When the base station system (BSS, Base Station System) to which the mobile station (MS, Mobile Station) currently belongs has insufficient coverage or excessive load, the network can handover the MS from the source BSS to the target BSS. the

In the existing GPRS system, MS can only transmit data on one carrier frequency. Taking the current enhanced GPRS (EGPRS, Enhanced GPRS) system as an example, the theoretical maximum rate of 8 time slots on a single carrier frequency is 473.6kbps. With the development of data services, such a rate can no longer meet the needs of users. Therefore, a number of communication manufacturers have proposed a new solution: downlink dual/multi-carrier transmission, that is, to let the MS perform simultaneous transmission on more than one carrier frequency. Downlink reception. In this way, the downlink transmission rate of the MS can be doubled. Still taking the current EGPRS as an example, if the MS receives on two carrier frequencies at the same time, the theoretical rate can be close to 1M, which can already meet the rate requirements of the third generation mobile communication (3G, 3rd Generation) system. After introducing the dual/multi-carrier transmission technology, the life cycle of the existing GPRS system is greatly extended. However, in the existing standards regarding the handover process of the PS domain, only the handover on a single carrier frequency is regulated. After the downlink dual/multi-carrier transmission technology is introduced, there is still no corresponding specification on how to perform PS handover. the

Contents of the invention

The purpose of the present invention is to provide a method capable of conveniently switching packet switching services under downlink dual/multi-carrier transmission. the

In order to achieve the purpose of the present invention, a technical solution adopted is: a method for switching packet switching services under downlink dual/multi-carrier transmission, including: the source base station system instructs the mobile station to switch from downlink dual/multi-carrier transmission to single Carrier transmission, the downlink dual/multi-carrier transmission is a transmission method that enables the mobile station to simultaneously perform downlink reception on more than one carrier frequency; the source base station system confirms that the mobile station switches to single-carrier transmission; the source base station system instructs the mobile station to use single-carrier transmission The packet switching service is handed over in a single-carrier mode; the mobile station accesses the target base station system in a single-carrier mode. the

The above handover method may also include an interactive process for handover preparation between the source base station system and the target base station system, including: the source base station system sends a handover request to the target base station system; the target base station system allocates single-carrier transmission resources for the mobile station; the source base station system Obtain the resource allocation confirmation returned by the target base station system. This interaction process can be performed before the source base station system instructs the mobile station to switch from downlink dual/multi-carrier transmission to single-carrier transmission; or after the source base station system confirms that the mobile station switches to single-carrier transmission, and after the source base station system instructs the mobile station to Carried out before packet-switching service handover in single-carrier mode. the

Another technical solution that can be adopted in the present invention is: a method for switching packet switching services under downlink dual/multi-carrier transmission, including: the source base station system sends a switching request to the target base station system; The source base station system obtains the resource allocation confirmation returned by the target base station system; the source base station system sends a handover command to the mobile station, and the handover command carries the single-carrier resource allocation of the target base station system; Command to leave the downlink dual/multi-carrier transmission of the source base station system, and access it in the target base station system in a single-carrier mode. The downlink dual/multi-carrier transmission is a transmission method that enables the mobile station to simultaneously perform downlink reception on more than one carrier frequency . the

In the above method, the mobile station can use the following method to access the target base station system: the mobile station initiates an access pulse to the target base station system; the target base station system notifies the mobile station of the timing advance that should be used; After receiving a certain amount of messages, start data transmission in the target base station system. the

In the above method, allocating single-carrier transmission resources for the mobile station by the target base station system may include establishing a relevant context for the mobile station by the target base station system and allocating wireless resources. the

Adopt above-mentioned technical scheme, the beneficial technical effect of the present invention is:

1) The present invention adopts the method that the network side controls the mobile station to leave the downlink dual/multi-carrier transmission and transfer to the single-carrier transmission before the mobile station performs the handover operation, and performs packet service switching in the single-carrier mode. The packet service switching after the carrier transmission technology provides executable specifications, and avoids the complicated process of switching multiple carrier frequencies at the same time, which is conducive to the success of the switching. the

2) The present invention provides two handover methods, which respectively make the mobile station leave the downlink dual/multi-carrier transmission and switch to single-carrier transmission through explicit instructions or implicit requirements, which can be flexibly selected according to the upgrade and transformation of the specific network. the

Description of drawings

The present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. the

Fig. 1 is a schematic flow diagram of a PS service switching method according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of the signaling flow of the method of Embodiment 1;

FIG. 3 is a schematic flow diagram of a PS service switching method in Embodiment 2 of the present invention;

Fig. 4 is the signaling flow diagram of the method of embodiment two;

Fig. 5 is a schematic flow diagram of a third PS service switching method according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a signaling flow of the method in the third embodiment. the

Detailed ways

The present invention provides a method for switching PS services under downlink dual/multi-carrier transmission. The core idea is that before the MS performs the switching operation, the network side controls the MS to leave the downlink dual/multi-carrier transmission and transfer to single-carrier transmission. PS switch in mode. The network side can control the MS to leave the downlink dual/multi-carrier transmission through explicit instructions, such as sending messages such as time slot reallocation to the MS; it can also be realized through implicit requirements, such as sending a handover command directly to the MS, And by carrying the single-carrier resource allocation of the target BSS in the handover command, the MS can automatically access the target BSS in a single-carrier manner. Each of them will be described in detail below. the

Embodiment 1. A method for switching PS services under downlink dual/multi-carrier transmission, the process of which is shown in Figure 1, including:

A1) The source BSS sends a handover request to the target BSS; the handover request indicates that an MS needs to switch into the target BSS;

A2) The target BSS establishes a BSS context for the MS according to the handover request, and allocates unlimited resources, where the allocated wireless resources are wireless resources of a single carrier frequency;

A3) The source BSS obtains the confirmation message returned by the target BSS, indicating that step A2) has been completed;

A4) The source BSS issues a command to the MS, instructing the MS to leave the downlink dual/multi-carrier transmission and turn to single-carrier transmission;

Because the downlink dual/multi-carrier transmission is based on the evolution technology of the existing downlink single-carrier transmission, the MS that supports the downlink dual/multi-carrier transmission supports the downlink single-carrier transmission by default. Switch between multi-carrier and single-carrier, for example, use downlink assignment message, time slot reallocation message, etc. to instruct MS to enter the corresponding transmission mode;

A5) The source BSS obtains the confirmation information returned by the MS, indicating that the MS has transferred to the downlink single-carrier transmission;

A6) The source BSS sends a handover command to the MS, instructing the MS to start PS handover;

A7) The MS initiates an access pulse to the target BSS;

A8) After receiving the MS's access pulse, the target BSS notifies the MS of the timing advance that should be used;

A9) After receiving the message indicating the timing advance, the MS starts data transmission at the target BSS. the

When the target BSS receives the first correct radio link control/media access control layer (RLC/MAC, Radio Link Control/Media Access Control) data block from the MS, it can judge that the handover is successful. the

In this embodiment, steps A1) to A3) of the handover preparation process and steps A6) to A9) of the handover process after the MS transfers to single bearer can all be similar to the corresponding process of single bearer handover in the existing standard. way to implement the present invention with minimal modification to existing standards. the

The specific signaling implementation process of the above method is as shown in Figure 2. Among Figure 2, the GPRS Service Support Node (SGSN, Serving GPRS Support Node) is responsible for forwarding signaling between the source BSS and the target BSS, that is, the source BSS sends the target signal to the target BSS. The signaling sent by the BSS and the target BSS to the source BSS is realized through the switching of the SGSN. SGSN is also responsible for routing the data packet sent by the GPRS gateway support node (GGSN, Gataway GPRS Support Node) to the target BSS after the handover is initiated; the signaling process in Figure 2 is:

a1) The source BSS determines to execute the PS handover;

a2) The source BSS sends a handover request to the SGSN;

a3) SGSN forwards the handover request to the target BSS;

a4) The target BSS establishes a BSS context for the MS, and performs unlimited resource allocation;

a5) The target BSS sends a handover request confirmation to the SGSN;

a6) SGSN routes the data packet sent by GGSN to the target BSS;

a7) SGSN forwards the handover request confirmation to the source BSS;

a8) The source BSS sends a downlink assignment message and a time slot reallocation message to the MS to instruct the MS to switch from downlink dual/multi-carrier transmission to single-carrier transmission;

a9) The MS returns to the source BSS the transfer-in single-carrier transmission confirmation;

a10) The source BSS issues a switching command to the MS;

a11) The MS initiates an access pulse to the target BSS;

a12) The target BSS returns the time advance that should be used to the MS;

a13) The MS updates the current location information to the SGSN;

a14) The target BSS sends a handover completion message to the SGSN;

a15) The MS performs data transmission at the target BSS. the

Embodiment 2, a method for switching PS services under downlink dual/multi-carrier transmission, the process is as shown in Figure 3, including:

B1) The source BSS issues a command to the MS in the downlink dual/multi-carrier transmission mode, instructing the MS to leave the downlink dual/multi-carrier transmission and turn to single-carrier transmission;

B2) The source BSS obtains the confirmation information returned by the MS, indicating that the MS has transferred to the downlink single-carrier transmission;

B3) The source BSS sends a handover request to the target BSS; the handover request indicates that an MS needs to switch into the target BSS;

B4) The target BSS establishes a BSS context for the MS according to the handover request, and allocates unlimited resources, where the allocated wireless resources are wireless resources of a single carrier frequency;

B5) The source BSS obtains the confirmation message returned by the target BSS, indicating that step B4) has been completed;

B6) The source BSS issues a handover command to the MS, instructing the MS to start PS handover;

B7) MS initiates an access pulse to the target BSS;

B8) After the target BSS receives the MS's access pulse, it notifies the MS of the timing advance that should be used;

B9) After receiving the message indicating the timing advance, the MS starts data transmission at the target BSS. the

When the target BSS receives the first correct RLC/MAC data block from the MS, it can judge that the handover is successful. the

The difference between this embodiment and Embodiment 1 is that when it is determined that a PS handover is required, the source BSS adopts a method of first transferring the MS from the dual/multi-carrier transmission mode to the single-carrier transmission mode, and then notifying the target BSS to prepare for the handover. You can choose flexibly according to the specific situation. the

The specific signaling implementation process of the above method is as shown in Figure 4, the role of the SGSN in Figure 4 is the same as in Embodiment 1; the signaling process in Figure 4 is:

b1) The source BSS determines to execute the PS handover;

b2) The source BSS sends a downlink assignment message and a time slot reallocation message to the MS to instruct the MS to switch from downlink dual/multi-carrier transmission to single-carrier transmission;

b3) The MS returns to the source BSS the transfer-in single-carrier transmission confirmation;

b4) The source BSS sends a handover request to the SGSN;

b5) SGSN forwards the handover request to the target BSS;

b6) The target BSS establishes a BSS context for the MS, and performs unlimited resource allocation;

b7) The target BSS sends a handover request confirmation to the SGSN;

b8) SGSN routes the data packet sent by GGSN to the target BSS;

b9) SGSN forwards the handover request confirmation to the source BSS;

b10) The source BSS sends a switching command to the MS;

b11) The MS initiates an access pulse to the target BSS;

b12) The target BSS returns the time advance that should be used to the MS;

b13) The MS updates the current location information to the SGSN;

b14) The target BSS sends a handover completion message to the SGSN;

b15) The MS performs data transmission at the target BSS. the

Embodiment 3, a method for switching PS services under downlink dual/multi-carrier transmission, the process is as shown in Figure 5, including:

C1) The source BSS sends a handover request to the target BSS; the handover request indicates that an MS needs to switch into the target BSS;

C2) The target BSS establishes a BSS context for the MS according to the handover request, and allocates unlimited resources, where the allocated wireless resources are wireless resources of a single carrier frequency;

C3) The source BSS obtains the confirmation message returned by the target BSS, indicating that step C2) has been completed;

C4) The source BSS sends a handover command to the MS, instructing the MS to start PS handover; the handover command here carries the description that the target BSS only allocates single-carrier resources for the MS;

C5) The MS leaves the downlink dual/multi-carrier transmission of the source BSS, and initiates an access pulse to the target BSS;

C6) After the target BSS receives the MS's access pulse, it notifies the MS of the timing advance that should be used;

C7) After receiving the message indicating the timing advance, the MS starts data transmission at the target BSS. the

When the target BSS receives the first correct RLC/MAC data block from the MS, it can judge that the handover is successful. the

The difference between this embodiment and the previous two embodiments is that in Embodiment 1 and Embodiment 2, the network side uses explicit commands, such as downlink assignment messages, time slot reassignment messages, etc., to instruct the MS to First transfer from dual/multi-carrier transfer mode to single-carrier transfer mode. However, in this embodiment, the implicit requirement method is used to directly instruct the MS to perform handover, but in the handover command, the target BSS only allocates single-carrier resources for the MS, so that the MS automatically connects to the target BSS in a single-carrier manner. enter. the

The specific signaling implementation process of the above-mentioned method is as shown in Figure 6, the role of SGSN in Figure 6 is the same as that in Embodiment 1; the signaling process in Figure 6 is:

c1) The source BSS determines to execute the PS handover;

c2) The source BSS sends a handover request to the SGSN;

c3) SGSN forwards the handover request to the target BSS;

c4) The target BSS establishes a BSS context for the MS, and performs unlimited resource allocation;

c5) The target BSS sends a handover request confirmation to the SGSN;

c6) SGSN routes the data packet sent by GGSN to the target BSS;

c7) SGSN forwards the handover request confirmation to the source BSS;

c8) The source BSS sends a handover command to the MS, and the handover command carries a description that the target BSS only allocates single-carrier resources for the MS;

c9) The MS leaves the downlink dual/multi-carrier transmission of the source BSS, and initiates an access pulse to the target BSS;

c10) The target BSS returns the time advance that should be used to the MS;

c11) The MS updates the current location information to the SGSN;

c12) The target BSS sends a handover completion message to the SGSN;

c13) The MS performs data transmission at the target BSS. the

The method for PS service switching under the downlink dual/multi-carrier transmission provided by the present invention has been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for To help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification It should not be construed as a limitation of the invention. the

Claims (8)

1. the method that packet switching service is switched is carried out in a descending pair/overloading transmission down, it is characterized in that, comprising:

Source base station system indication travelling carriage turns to transmission in single year by the transmission of descending pair/overloading, and described descending pair/overloading transmission is to make travelling carriage surpass the transmission means of carrying out descending reception simultaneously on the carrier frequency;

Source base station system validation travelling carriage changes transmission in single year over to;

Source base station system indication travelling carriage carries out packet switching service in single year mode and switches;

Travelling carriage inserts in the target BS system in single year mode.

2. the method that packet switching service is switched is carried out in descending pair/overloading transmission according to claim 1 down, it is characterized in that, before source base station system indication travelling carriage turns to transmission in single year by the transmission of descending pair/overloading, also comprises:

The source base station system sends handoff request to the target BS system;

Transfer resource is carried for the travelling carriage schedule of apportionment in the target BS system;

The source base station system obtains the resource allocation affirmation that the target BS system returns.

3. the method that packet switching service is switched is carried out in descending pair/overloading transmission according to claim 1 down, it is characterized in that, after source base station system validation travelling carriage changes transmission in single year over to, and before source base station system indication travelling carriage carries out the packet switching service switching in single year mode, also comprise:

The source base station system sends handoff request to the target BS system;

Transfer resource is carried for the travelling carriage schedule of apportionment in the target BS system;

The source base station system obtains the resource allocation affirmation that the target BS system returns.

4. the method that packet switching service is switched is carried out in any described descending pair/overloading transmission down according to claim 1～3, it is characterized in that described travelling carriage inserts employing in the target BS system:

Travelling carriage initiates to insert pulse to the target BS system;

The Timing Advance that target BS notifications travelling carriage should use;

After travelling carriage was received the message of lead instruction time, beginning was carried out transfer of data in the target BS system.

5. carry out the method that packet switching service is switched down according to claim 2 or 3 described descending pair/overloading transmission, it is characterized in that: described target BS system comprises that for the travelling carriage schedule of apportionment carries transfer resource the target BS system is that travelling carriage is set up related context and distributing radio resource.

6. the method that packet switching service is switched is carried out in a descending pair/overloading transmission down, it is characterized in that, comprising:

The source base station system sends handoff request to the target BS system;

Transfer resource is carried for the travelling carriage schedule of apportionment in the target BS system;

The source base station system obtains the resource allocation affirmation that the target BS system returns;

The source base station system issues switching command to travelling carriage, and the list that described switching command carries described target BS system carries resource allocation;

Travelling carriage leaves the descending two/overloading transmission of source base station system according to described switching command, insert in the target BS system in single year mode, described descending pair/overloading transmission is to make travelling carriage surpass the transmission means of carrying out descending reception simultaneously on the carrier frequency.

7. the method that packet switching service is switched is carried out in descending pair/overloading transmission according to claim 6 down, it is characterized in that described travelling carriage inserts employing in the target BS system:

Travelling carriage initiates to insert pulse to the target BS system;

The Timing Advance that target BS notifications travelling carriage should use;

After travelling carriage was received the message of lead instruction time, beginning was carried out transfer of data in the target BS system.

8. carry out the method that packet switching service is switched down according to claim 6 or 7 described descending pair/overloading transmission, it is characterized in that: described target BS system comprises that for the travelling carriage schedule of apportionment carries transfer resource the target BS system is that travelling carriage is set up related context and distributing radio resource.

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