CN1184834C

CN1184834C - Switching method between frequencies

Info

Publication number: CN1184834C
Application number: CN 01144931
Authority: CN
Inventors: 李志明
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2001-12-24
Filing date: 2001-12-24
Publication date: 2005-01-12
Anticipated expiration: 2021-12-24
Also published as: CN1429031A

Abstract

The present invention discloses a switching method between frequencies, which comprises the steps that user equipment monitors the signal quality of the original subzone, and reports the measuring result to a network when the monitored signal quality is lower than a predefined threshold; the network determines to apply the gate control technique of a special physical control signal channel for carrying out measurement between frequencies and configure a transmission format set (TFS) and DPCCH gate control parameters at the UE and a base station side according to the reported result; the UE and the network side carry out gate control according to the gate control parameters; the UE synchronizes subzones with adjacent frequencies and measures the signal quality via a clearance generated by the DPCCH gate control technique, and reports the measured result to the network; the network judges whether the switching between frequencies is necessary or not according to the measured result, and informs the UE to switch between frequencies at an appointed time if necessary. The switching method between frequencies can fully utilize the gate control clearance, raise the utilization rate of system resources, shorten TPC transmission intervals and prevent the reduction of the signal quality of the original link in a switching zone.

Description

A kind of switching method between frequencies

Technical field

The present invention relates to subscriber equipment (UE) changing method between different base station, especially switching method between frequencies in the mobile communication system.

Background technology

In mobile communication system; UE is at the switching problem that can relate to usually to the process that target BS moves from home base stations between the base station; because the frequency that UE used when connecting with home base stations or target BS may be different, therefore this switching is switched between coming down to frequently.Handover scheme utilizes compact model to finish between existing frequency, concrete grammar is: when the signal quality that monitors original sub-district as UE is lower than certain predefine thresholding, measurement result is reported network, the network based result who reports, compressed-mode parameter by signaling configuration UE and base station side also starts compact model, the synchronous and signal quality measured of adjacent sub-district frequently carried out in the gap that UE produces by compact model, and measurement result reported network, network based reporting measurement result determines whether to carry out to switch between frequency, when needs switch, UE switches by signaling, after UE receives switching command, getting in touch of the cut-out of the moment of appointment and original sub-district, connect with alien-frequency district.The key of switching is that the synchronous and measurement of adjacent sub-district is frequently carried out in the gap that utilizes compact model to produce between frequency.Because the gap that compact model produces is bigger, may cause the more power control bit information of losing, cause the data transmission link degradation, and in switching process between frequencies, signal quality itself is variation just, need prevent that link-quality from reducing by accurate power controls, therefore existing switching method between frequencies is unfavorable for preventing that link-quality from reducing.

Summary of the invention

The object of the present invention is to provide a kind of switching method between frequencies that helps preventing the link-quality reduction.

For achieving the above object, switching method between frequencies provided by the invention comprises: the signal quality of the original sub-district of (1) subscriber equipment (UE) monitoring when the signal quality that monitors is lower than the predefine thresholding, reports network with measurement result;

(2) the network based result who reports determines to adopt Dedicated Physical Control Channel (DPCCH) gating technology to carry out inter-frequency measurement, and the DPCCH gate parameter of configuration UE and base station side, and configuring transmission format collection (TFS);

(3) UE and base station side are carried out gate according to the gate parameter, and the synchronous and signal quality measured of adjacent sub-district frequently carried out in the gap that UE utilizes the DPCCH gating technology to produce, and measurement result is reported network;

(4) network based measurement result judges whether to carry out to switch between frequency, and if desired, notice UE switches;

(5) UE finishes switching between frequency according to switching notice in the moment of appointment.

Carrying out the neighbour in the above-mentioned steps (3) finishes by slot synchronization, frame synchronization and code group identification, scrambler identification the sub-district frequently synchronously.

Carry out signal quality measured in the above-mentioned steps (3) for carrying out the chip energy of Common Pilot Channel received signal code power (CPICH RSCP) or Common Pilot Channel and the measurement of the ratio (CPICH Ec/NO) of in-band noise power density.

Above-mentioned steps (3) also comprises: the data to packet domain (PS) cushion, and wait for after finish in the gate gap sending again, and the data of circuit domain (CS) are abandoned.

Foregoing can also be used following content to replace: the data to packet domain (PS) cushion, and wait for after finish in the gate gap sending again, for the data of circuit domain (CS), send and satisfy the data that TFS requires.

Above-mentioned steps (3) also comprises: during the gate gap, read through-put power control (TPC) information among the DPCCH, and utilize this information to keep the continuous of power control.

Because the present invention adopts DPCCH gate gap to carry out inter-frequency measurement, promptly can carry out the synchronous and measurement in sub-district, thereby switch between finishing frequently, so both made full use of the gate gap, improved the resource utilization of system, can shorten the transmission intercal of TPC again, therefore can prevent the reduction of Zone switched interior original link signal quality.

Description of drawings

Fig. 1 is the embodiment flow chart of the method for the invention;

Fig. 2 is gate gap figure;

Fig. 3 is a hand off signaling flow chart between the frequency of using when of the present invention.

Embodiment

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

The DPCCH gating technology is applicable to the up-downgoing data transmission link, when not having data to send, stops to send DPCCH, when data need send, recovers the transmission of DPCCH and DPDCH (Dedicated Physical Control Channel and Dedicated Physical Data Channel) again.Because gating technology adopts such scheme, compares with compact model, the gate gap that it produces in a Frame is discontinuous, makes that the gate gap is less, if adopt gating technology to carry out switching between frequency, can make the TPC information of losing less.Essence of the present invention is that the synchronous and measurement of inter-frequency cell is carried out in the gap that UE produces by the DPCCH gating technology, and it can keep the continuity of power control when the physical frame gap is provided, improve the performance of switching between frequency.

Fig. 1 is the embodiment flow chart of the inventive method.Implement the present invention according to Fig. 1, the 1st step, the signal quality of the original sub-district of user equipment monitors, and the signal quality that monitors judged, when the signal quality that monitors is lower than the predefine thresholding, measurement result is reported network; The 2nd step, the network based result who reports, determine to adopt Dedicated Physical Control Channel (DPCCH) gating technology to carry out inter-frequency measurement, and the DPCCH gate parameter of configuration UE and base station side, and configuring transmission format collection (TFS), finish by slot synchronization, frame synchronization and code group identification, scrambler identification synchronously described neighbour's frequency sub-district of carrying out.Described carry out signal quality measured for carrying out the chip energy of Common Pilot Channel received signal code power (CPICH RSCP) or Common Pilot Channel and the measurement of the ratio (CPICH Ec/NO) of in-band noise power density; In the 3rd step, UE and base station side are carried out gate according to the gate parameter, and the synchronous and signal quality measured of adjacent sub-district frequently carried out in the gap that UE utilizes the DPCCH gating technology to produce, and measurement result is reported network.During the DPCCH gate gap in this step, the DPDCH for gate gap correspondence handles respectively according to data type, and the data in PS territory are cushioned, and waits for after the gap finishes sending again; And for the CS numeric field data, data are abandoned or sending part divided data only, but the size that sends data satisfies the requirement of TFS, because TFS is limited; During the gate gap in this step, also to read the TPC information among the DPCCH, and utilize this information to keep the continuous of power control, prevent the further variation of original link signal quality; In the 4th step, network based measurement result judges whether to carry out to switch between frequency, and if desired, notice UE switches; In the 5th step, UE finishes switching between frequency according to switching notice in the moment of appointment.

Compare with compact model, because therefore the gap that DPCCH gate gap produces less than compact model can use continuous several gates gap when the present invention specifically uses, altogether with reference to figure 2.Among the figure, S1 is the gate gap to S6, and narrow post is DPCCH partly, can S1 is synchronous as adjacent sub-district to S6 in the reality, and follow-up gap is used for measuring.

Be a concrete application example of the present invention below, with reference to figure 3.Shown in the figure, when the signal quality that UE monitors original sub-district is lower than certain predefine thresholding, the measurement result of original sub-district is reported the serving BS controller (SRNC) of network by measurement report signaling (Measurement Report), SRNC is according to the result who reports, determine to adopt the DPCCH gating technology to carry out inter-frequency measurement, send radio link reconfiguration demand signalling and radio bearer reconfiguration request signaling (Radio Link ReconfigurationRequest and Radio Bearer Recongfiguration Request) the DPCCH gate parameter of configurating base station side and UE side respectively to former cell base station (Home BS) and UE respectively then, and dispose limited TFS, after parameter configuration finished, Home BS and UE reshuffled the message that the signaling that finishes (RadioLink Reconfiguration Complete and Radio Bearer RecongfigurationComplete) finishes to the configuration of SRNC feedback parameter respectively by sending finish signaling and radio bearer of radio link reconfiguration.UE and base station side are being specified constantly and startup DPCCH gating technology on the specific radio frames according to configuration parameter, the search of adjacent sub-district is frequently carried out synchronously with signal quality measured in the gap that UE produces by the DPCCH gating technology, during the gap, the advanced row buffering of high-rise data to the PS territory is waited for after the gap finishes sending data again; For the CS numeric field data, high-rise data being abandoned or sending part divided data only, the size that sends the CS numeric field data satisfies the requirement of limited TFS.UE is after finishing adjacent cell measurement frequently, with the neighbour frequently cell measurement results by reporting network by measurement report signaling (Measurement Report), be SRNC, SRNC judges whether that according to the reporting measurement result needs carry out switching between frequency, if desired, set up the link that demand signalling (Radio Link SetupRequest) is set up SRNC and Target cell by sending Radio Link to target BS (Target BS), sending physical channel reconfiguration request signaling (Physical Channel Reconfiguration Request) notice UE to UE then carries out switching between frequency, after UE receives switching command, getting in touch of the cut-out of the moment of appointment and original sub-district, connect with alien-frequency district.Original sub-district, be that Home BS lost efficacy indication signaling (Radio Link Failure Indication) to the inefficacy of SRNC reporting links by Radio Link, SRNC deletes original sub-district link according to the link failure indication by send Radio Link removal request signaling (Radio LinkDelete Request) to Home BS.After UE and Target cell are set up link, reshuffle by physical channel again and finish signaling (Physical Channel ReconfigurationComplete) and report to switch to SRNC and finish.

Claims

1, a kind of switching method between frequencies comprises:

(1) signal quality of the original sub-district of user equipment monitors when the signal quality that monitors is lower than the predefine thresholding, reports network with measurement result;

(2) the network based result who reports determines to adopt the Dedicated Physical Control Channel gating technology to carry out inter-frequency measurement, and the Dedicated Physical Control Channel gate parameter of configure user equipment and base station side, and the configuring transmission format collection;

(3) subscriber equipment and base station side are carried out gate according to the gate parameter, and the synchronous and signal quality measured of adjacent sub-district frequently carried out in the gap that subscriber equipment utilizes the Dedicated Physical Control Channel gating technology to produce, and measurement result is reported network;

(4) network based measurement result judges whether to carry out to switch between frequency, and if desired, notifying user equipment is switched;

(5) subscriber equipment is finished switching between frequency according to switching notice in the moment of appointment.

2, switching method between frequencies according to claim 1 is characterized in that carrying out in the step (3) neighbour and finishes by slot synchronization, frame synchronization and code group identification, scrambler identification synchronously the sub-district frequently.

3, switching method between frequencies according to claim 1 is characterized in that carrying out in the step (3) signal quality measured for carrying out the chip energy of Common Pilot Channel received signal code power or Common Pilot Channel and the measurement of the ratio of in-band noise power density.

4, switching method between frequencies according to claim 1, it is characterized in that described step (3) also comprises: the data to packet domain cushion, and wait for after finish in the gate gap sending again, and the data of circuit domain are abandoned.

5, switching method between frequencies according to claim 1, it is characterized in that described step (3) also comprises: the data to packet domain cushion, wait for after finish in the gate gap sending again,, send the data that satisfy the TFS Transport Format Set requirement for the data of circuit domain.

6, according to claim 1,4 or 5 described switching method between frequencies, it is characterized in that described step (3) also comprises: during the gate gap, read the transmission power control information in the Dedicated Physical Control Channel, and utilize this information to keep the continuous of power control.