CN1270489C

CN1270489C - A downlink data transmission re-assignment method in GPRS system

Info

Publication number: CN1270489C
Application number: CNB031563813A
Authority: CN
Inventors: 唐雪; 孟志浩
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2003-09-05
Filing date: 2003-09-05
Publication date: 2006-08-16
Anticipated expiration: 2023-09-05
Also published as: CN1523835A

Abstract

The present invention discloses a newly assigning method for downlink data transmission in a GPRS system, which comprises the following steps: (1), a BSS receives a first uplink data block with a TLLI indication bit sent by an MS; (2), the BSS looks up a TBF matching with the TLLI in all currently established downlink TBF, and if the TBF is not found, then, the operation is directly ended; (3), otherwise, the BSS preserves the current downlink TBF data of the MS and newly applies downlink resources according to the resources of currently established uplink TBF; (4), the BSS newly carries out downlink communication channel assignment in a PACCH communication channel of the current uplink TBF; (5), after the newly assignment succeeds, the downlink data transmission of the MS is newly carried out; (6), the operation is ended. When the method of the present invention is adopted, the problem that a downlink data packet is discarded due to that the assignment of a downlink communication channel can not be correctly sent to the MS during the simultaneous establishment processes of the uplink TBF and the downlink TBF is effectively solved, and the rate of the downlink data transmission is improved to a certain extent.

Description

The heavy assigning method of a kind of downlink data transmission in the gprs system

Technical field

The present invention relates to GPRS (General Packet Radio Service wireless packet data service) system, the assigning method of downlink data transmission in the gprs system.

Background technology

In the GPRS wireless telecommunication system, the transmission of up-downgoing data is to realize by setting up Temporary Block Flow (Temp Block Flow is hereinafter to be referred as TBF) in the wave point.Because the asymmetry of up-downgoing transfer of data, the process that GPRS sets up uplink and downlink TBF is relatively independent.The foundation of TBF all needs BSS (Base Station System, base station system) at first to distribute wireless channel, gives MS (Mobile Station, travelling carriage) by the formula of upstream or downstream appointment side with appointing wireless resource again.For downstream assigned, according to ETSI (European Telecommunications Standards Institute, european telecommunications standards institute) agreement GSM 04.60 version 7.3.1 Release 1998 series, BSS has the mode of two kinds of transmissions, a kind of is when there is upstream or downstream TBF in MS, BSS can pass through PACCH (Packet AssociatedControl Channel, grouping channel associated signalling channel) channel and send and assign; The second way is that BSS sends to MS by Common Control Channel with appointment when the up-downgoing TBF that does not exist at this MS.

In normal flow, BSS is not having to suppose under the situation of up TBF that MS is monitoring Common Control Channel, but this hypothesis is always incorrect.Because the foundation of the up-downgoing TBF on the wave point and discharge very frequent, BSS receive downlink data carry out downstream assigned in very possible this MS be in setting up in the process of up TBF, at this moment downstream assigned will be failed.Fig. 1 describes the generating process of this situation in detail.Because TLLI (Temp Logic Link Identift, TLLI) is unique basis of BSS identification MS, therefore send before first comprises the TLLI uplink data block at MS, BSS can't discern the MS's that this time inserts.Fig. 1 is owing to up-downgoing TBF sets up the process schematic diagram that causes the downstream assigned failure simultaneously.As shown in Figure 1,1., MS initiates up access request to BSS; 2., SGSN has the downlink data packet of this MS to arrive BSS before BSS does not carry out up appointment as yet; Because there is not the up TBF that has set up this moment, therefore can't to discern the MS of up access this moment be exactly the MS that will receive this downlink data to BSS, therefore according to the agreement regulation, BSS supposes that this MS is also monitoring Common Control Channel, and downstream assigned will send on the secondary common control physical channel.3., BSS carries out up appointment; 4., up assign successfully after, MS sends uplink data block to BSS; 5., BSS carries out downstream assigned on Common Control Channel; This moment, in fact MS monitored downlink data block in the up appointment of response back with regard to having forwarded on the corresponding packet data transport channel, therefore can't receive the downstream assigned on Common Control Channel, consequently 6., descending poll failure, this time downlink data transmission is assigned failure, and the downlink data packet of this MS will be dropped.In the framework of existing protocol and in the existing public technology document, not seeing relevant technology can address this problem well.

Summary of the invention

Purpose of the present invention be exactly when overcoming that up-downgoing TBF sets up simultaneously in the prior art descending TBF assign the low problem of success rate, the heavy assigning method of downlink data transmission in a kind of gprs system is proposed.

Technical scheme of the present invention is: the heavy assigning method of a kind of downlink data transmission in the gprs system comprises the following steps:

(1) BSS receives first uplink data block that has the TLLI indicating bit that MS sends;

(2) BSS searches the TBF that is complementary with this TLLI at current all descending TBF that set up, if do not find, then directly finishes;

(3) otherwise BSS preserve the current descending TBF data of this MS and apply for downlink resource again according to the resource of the current up TBF that has set up;

(4) BSS carries out the down channel appointment again at the PACCH of current up TBF channel;

(5) after assigning successfully again, carry out the downlink data transmission of this MS again;

(6) finish.

The core concept of heavy assigning method proposed by the invention is: in setting up the process of up TBF, when the BSS side joint is received first data block that has the TLLI sign, to search current all descending TBF that set up, thereby find the descending TBF that has made a mistake, and guarantee the correct transmission of downlink data by the mode of applying for down channel resources again and heavily assign from the PACCH channel.Adopt method of the present invention, solved up-downgoing TBF effectively and set up simultaneously in the process, down channel is assigned can not correctly send to MS, thereby the problem that causes downlink data packet to be dropped has improved downlink transmission data rate to a certain extent.

Description of drawings

Fig. 1 is owing to up-downgoing TBF sets up the process schematic diagram that causes the downstream assigned failure simultaneously.

Fig. 2 is the flow chart of the heavy assigning method that proposes of the present invention.

Embodiment

The present invention is described in further detail below in conjunction with accompanying drawing.

Fig. 1 had carried out explanation in background technology.

Fig. 2 is the flow chart of the heavy assigning method that proposes of the present invention.As shown in Figure 2, the present invention includes the following step: (1) BSS receives first uplink data block that has the TLLI indicating bit that MS sends.In conjunction with Fig. 1, this moment should be in step 4. after.(2) BSS searches the TBF that is complementary with this TLLI at current all descending TBF that set up, if do not find, then directly finishes.According to the step in the former agreement regulation execution graph 1 5. before, BSS will search current all descending TBF that set up, thereby finds the descending TBF that has made a mistake.If do not find, the descending TBF that has not made a mistake then is described, directly finish.(3) otherwise BSS preserves the current descending TBF data of this MS, prolong the life cycle of downlink data, and apply for downlink resource again according to the resource of the current up TBF that has set up.(4) BSS carries out the down channel appointment again at the PACCH of current up TBF channel.(5) after assigning successfully again, carry out the downlink data transmission of this MS again.(6) finish.

Claims

1, the heavy assigning method of a kind of downlink data transmission in the gprs system is characterized in that comprising the following steps:

(1) begin to set up temporary up-link block flow, MS initiates up access request to BSS, and BSS carries out up appointment, after BSS assigns successfully to MS up, receives first uplink data block that has the TLLI indicating bit that MS sends;

(2) BSS searches the Temporary Block Flow that is complementary with this TLLI at current all descending Temporary Block Flows of having set up, if do not find, then directly finishes;

(3) otherwise BSS preserves the Temporary Block Flow that is complementary with this TLLI and according to the resource bid downlink resource of the current temporary up-link block flow of having set up;

(4) BSS carries out the down channel appointment at the grouping channel associated signalling channel of current temporary up-link block flow;

(5) after assigning successfully, carry out the downlink data transmission of this MS;

(6) finish.