CN101431776A - Method for controlling inter-frequency and inter-system handover measurement by RNC - Google Patents
Method for controlling inter-frequency and inter-system handover measurement by RNC Download PDFInfo
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Abstract
The invention relates to a method for switching measurement between an RNC control frequency and a system, comprising the following steps: an RNC decides whether to redistribute a traffic channel of a UE according to received measurement report from the UE; and if the RNC decides to redistribute the traffic channel of the UE, the RNC decides which time slot to redistribute the traffic channel of the UE. The method synthetically considers according to signal strength condition of a peripheral cell and a cell reflected in measurement report of the UE, and decides whether to more the channel. If the signal of the UE is strong in the cell or weakens in the cell, but the periphery has other cells with stronger signals, the method can ignore and bear measurement failure during measurement of a target cell; and if the signal of the UE is weak in the cell, and the periphery has no any synchronous cell, or has a synchronous cell, but is not suitable for switching, and the method needs to move the channel of the UE. Therefore, the method can avoid measurement failure, so as to reduce cutting off rate.
Description
Technical field
The present invention relates to frequency/measuring process before switching between system from 3-G (Generation Three mobile communication system) 1.28Mcps TDD (time division duplex) system to alien frequencies 1.28Mcps TDD/ alien frequencies 3.84Mcps TDD system/second generation GSM (mobile global system) system.
Background technology
The function that regulation 1.28McpsTDD system supports between frequency/switches between system in 3GPP (third generation partner plan) RAN (Radio Access Network) standard.Because multiple access technology and depositing in existing and mobile communication system in the future, for example: 3-G (Generation Three mobile communication system)-wideband CDMA system (FDD that comprises the WCDMA system, 1.28Mcps TDD, 3.84Mcps tdd mode, and cdma2000) and second generation mobile communication system GSM.And, have the possibility of multiple carrier frequency again for 1.28Mcps TDD system.So the support of 1.28Mcps TDD system switches to alien-frequency district from the 1.28McpsTDD sub-district or use the sub-district of different access technologies (inter-RAT) to be necessary.On the one hand, can improve system's coverage rate; On the other hand, the heavier system that can lighten the load, thus improve power system capacity.If the mobile phone terminal bimodulus or the multi mode terminal that switch between this can finish between frequency/system.
Carry out between frequency in 1.28Mcps TDD system/before switching between system, UE will do the preparation before switching: UE receives the cell list of measuring from the needs of RNC, and measures at the idle time slot except that Traffic Channel.In the starting stage of measuring, UE will utilize idle time slot to carry out with it synchronously by the synchronizing channel of Target cell, the process of Here it is Cell searching.
When Serving cell and Target cell synchronously after, just can or use the system of other access technologies to carry out other parameter measurements to alien frequencies, picked up signal intensity (for example: for the 1.28McpsTDD/3.84Mcps TDD Target cell of alien frequencies, can measure the RSCP or the path loss of P-CCPCH channel; For the GSM Target cell, can measure the RSSI of BCCH channel.)。These parameters will be used for SRNC and determine whether carrying out between frequency/switching between system, and provide necessary parameter for switching.
As shown in Figure 2, stipulated to switch the preceding control procedure of measuring among the 3GPP standard TS 25.331:
201:RNC order UE measures Serving cell and the same frequency, alien frequencies, the different system cell that close on.Tested cell list is given UE by the RRC signaling.
202:UE utilizes idle time slot to measure.In 3GPP standard TS 25.225; regulation is worked as bimodulus or multi mode terminal is operated under the 1.28Mcps tdd mode; do if desired between frequency/system's measurements, can directly utilize idle time slot except that the upstream and downstream Traffic Channel of UE (subscriber equipment) to do between frequency/inter-system handover measurement.At business time-slot, the frequency of UE is the carrier frequency of Serving cell appointment; When needs when the crack is measured at one's leisure, then the frequency of UE need switch to tested sub-district specified frequency, carries out then between frequency/system's measurements, before Traffic Channel is arrived once more, UE be switched back to the frequency of Serving cell.The conversion of frequency is finished by synthesizer.The position of measurement window and size depend on that current channel configuration situation and mobile phone terminal are transformed into synthesizer switching time under other frequencies or the other system pattern from 1.28Mcps TDD.As shown in Figure 3, A, B, C are three measurement window.
203:UE reports measurement result to RNC by the measurement report of RRC signaling.Two kinds of report modes are arranged: the one, the Event triggered mode is reported, and the 2nd, periodically report.RNC will specify in which way and report.
This process repeats, and finishes up to measurement, or has measurement to cease and desist order.
When 1.28Mcps TDD/GSM bimodulus or multi mode terminal are worked under the 1.28Mcps tdd mode; if proceed to system's measurements of GSM sub-district; mobile phone will be changed between the carrier frequency of the carrier frequency of 1.28Mcps TDD sub-district and GSM sub-district; when switch transition time of synthesizer greater than 0.6ms; synchronizing channel (SCH) or verification channel (FCCH) that UE catches fall short GSM sub-district at one's leisure in the measurement window in crack forever then might occur, cause the synchronization failure of measuring when initial.
When 1.28Mcps TDD mobile phone proceeds to the inter-frequency measurements of alien frequencies 1.28Mcps TDD sub-district, mobile phone will be changed between the carrier frequency of two 1.28Mcps TDD sub-districts.If these two sub-districts are synchronous, during at TS0 or TS6, then can't observe the DwPTS or the P-CCPCH channel of alien-frequency district in TS1 or downlink traffic channel when the reverse link traffic channel of UE so, cause and measure failure; If these two sub-districts are nonsynchronous, so when the DwPTS of shared time slot of the upstream or downstream Traffic Channel of UE and target alien-frequency district or P-CCPCH are overlapping, then can appear at the DwPTS or the P-CCPCH that catch the fall short sub-district in the window of idle time slot forever, cause and measure failure.
When 1.28Mcps TDD mobile phone proceeds to the inter-frequency measurements of alien frequencies 3.84Mcps TDD sub-district, mobile phone will be changed between the carrier frequency of 1.28Mcps TDD sub-district and 3.84Mcps TDD sub-district.Because synchronizing channel (SCH) position of 3.84Mcps TDD sub-district is uncertain, so when the SCH of the upstream or downstream Traffic Channel of UE and target alien-frequency district or P-CCPCH are overlapping, then can appear at the SCH or the P-CCPCH that catch the fall short sub-district in the window of idle time slot forever, cause and measure failure.
Summary of the invention
The purpose of this invention is to provide the method that reaches inter-system handover measurement between a kind of RNC control frequency.
For achieving the above object, reach the method for inter-system handover measurement between a kind of RNC control frequency, comprise step:
1) RNC order UE measures Serving cell and the same frequency, alien frequencies and the different system cell that close on, and tested cell list is given UE by the RRC signaling;
2) UE utilizes idle time slot to measure.In the starting stage of measuring, UE will utilize idle time slot to carry out with it synchronously by the synchronizing channel of Target cell, after Serving cell and Target cell are synchronous, other parameters be measured, and comprise signal strength signal intensity, path loss, signal to noise ratio etc.;
3) UE reports measurement result to RNC by the measurement report of RRC signaling;
4) whether RNC will redistribute the Traffic Channel of UE according to the measurement report decision from UE that receives;
5) if the Traffic Channel of UE is redistributed in RNC decision, RNC will determine the Traffic Channel of UE redistributed and be which time slot so;
6) RNC finishes the channel reconfiguration course by RRC signaling and NBAP signaling, gives UE and Node B respectively with new Traffic Channel parameter, and in preset time, activates new channel configuration.So just Traffic Channel is moved to other time slots from current time slots;
7) if measurement does not have to finish and do not receive from the measurement of RNC to cease and desist order, then return step 2).
Take all factors into consideration according to its peripheral cell that reflects in the UE measurement report and the signal strength condition of this sub-district, whether decision needs that it is carried out channel is moved.If UE the signal of this sub-district more and more a little less than, be lower than a certain value, RNC will monitor from the measurement report that closes on the different frequency/different system cell in the neighbor list.RNC according to measurement report estimate UE whether with each different frequency/different system adjacent cells all synchronously on.For the different frequency/different system cell on synchronously, detect the signal strength signal intensity (e.g.P-CCPCH RSCP or GSM carrier RSSI) of UE in this sub-district and whether surpass a certain threshold value, if surpass this threshold value, be judged as then that this sub-district is suitable switches.The if there is no adjacent cells of any one different frequency/different system, UE and its have gone up and suitable the switching synchronously, so just need carry out channel to UE and move, and can avoid like this measuring and fail, thereby can reduce cutting off rate.Judge whether UE is synchronous with tested sub-district, for the TDD system, can be according to whether there being measurement result (e.g.P-CCPCH RSCP, pathloss, and etc.) to decide in the measurement report, if there is measurement result, then explanation is successful synchronously; For gsm system, can whether be verified according to BSIC and decide, if be verified, then explanation success synchronously.Determine that UE is carried out channel to be moved if be directed to RNC, how RNC carries out channel to UE is moved, the algorithm of being given among the present invention can guarantee that a secondary channel is moved and can improve synchronous probability, two secondary channels are moved and can be guaranteed that synchronous probability reaches more than 90%, even in synthesizer switching time during less than 0.2ms, synchronous probability reaches 100%.
Description of drawings
Fig. 1 is in the 1.28Mcps TDD system, between improved RNC control frequency/and the inter-system handover measurement process.
Fig. 2 is in the 1.28Mcps TDD system, between existing RNC control frequency/and the inter-system handover measurement process.
Fig. 3 is in the 1.28Mcps TDD system, the idle time slot that can be used for measuring.A, B, C are measurement window.
Fig. 4 is the idle time slot that can be used for measure of traffic channel assignments when being (TS3 is up, and TS4 is descending), and A2 is a measurement window.
Fig. 5 is the idle time slot that can be used for measure of traffic channel assignments when being (TS1 is up, and TS6 is descending), and A1, B1 are measurement window.
Embodiment
At between frequency/problem of the synchronization failure that may exist in system's measurements process, can solve by the Traffic Channel of UE is redistributed, Traffic Channel with UE moves to other time slots exactly, makes that the position of measurement window is changed, thereby improves synchronous probability.Channel is reshuffled and can be finished by existing RRC and NBAP signaling in the existing standard.
Even like this, in realization, still have two problems need examine rate: the one,, whether necessaryly just need carry out channel and redistribute whenever measuring failure? reshuffling of Radio Resource brings bigger complexity can for the management of Radio Resource after all.The 2nd,, carry out channel if desired and redistribute, is need channel re-assigned to which time slot? because UE and RNC do not know it is that the synchronizing channel of which business time-slot and Target cell is overlapping.
At these two problems, the present invention proposes following solution: RNC will take all factors into consideration according to its peripheral cell that reflects in the UE measurement report and the signal strength condition of this sub-district, and whether decision needs that it is carried out channel is moved.If UE the signal of this sub-district more and more a little less than, be lower than a certain value, RNC will monitor from the measurement report that closes on the different frequency/different system cell in the neighbor list.RNC according to measurement report estimate UE whether with each different frequency/different system adjacent cells all synchronously on.For the different frequency/different system cell on synchronously, detect the signal strength signal intensity (e.g.P-CCPCH RSCP or GSM carrier RSSI) of UE in this sub-district and whether surpass a certain threshold value, if surpass this threshold value, be judged as then that this sub-district is suitable switches.The if there is no adjacent cells of any one different frequency/different system, UE and its have gone up and suitable the switching synchronously, so just need carry out channel to UE and move, and can avoid like this measuring and fail, thereby can reduce cutting off rate.Judge whether UE is synchronous with tested sub-district, for the TDD system, can be according to whether there being measurement result (e.g.P-CCPCH RSCP, pathloss, and etc.) to decide in the measurement report, if there is measurement result, then explanation is successful synchronously; For gsm system, can whether be verified according to BSIC and decide, if be verified, then explanation success synchronously.
If the RNC decision is carried out channel to UE and is moved, how the RNC decision carries out channel to UE is moved, the algorithm of being given among the present invention can guarantee that a secondary channel is moved and can improve synchronous probability, two secondary channels are moved and can be guaranteed that synchronous probability reaches more than 90%, even in synthesizer switching time during less than 0.2ms, synchronous probability reaches 100%.
The present invention proposes in a kind of 1.28Mcps TDD system, between improved RNC control frequency/method of inter-system handover measurement.With between existing RNC control frequency/method of inter-system handover measurement compares, in order to reduce cutting off rate, RNC will take all factors into consideration according to its peripheral cell that reflects in the UE measurement report and the signal strength condition of this sub-district, and whether decision needs it is carried out that channel is redistributed and how to carry out channel and redistribute.RNC has increased following 2 new functions:
1. between frequency and in the inter-system handover measurement process, whether RNC will redistribute the Traffic Channel of UE according to the decision from the measurement report of UE that receives: if UE the signal of this sub-district more and more a little less than, be lower than a certain value, RNC will monitor from the measurement report that closes on the different frequency/different system cell in the neighbor list.RNC according to measurement report estimate UE whether with each different frequency/different system adjacent cells all synchronously on.For the different frequency/different system cell on synchronously, detect the signal strength signal intensity (e.g.P-CCPCH RSCP or GSM carrier RSSI) of UE in this sub-district and whether surpass a certain threshold value, if surpass this threshold value, be judged as then that this sub-district is suitable switches.The if there is no adjacent cells of any one different frequency/different system, UE and its have gone up and suitable the switching synchronously, so just need carry out channel to UE and move, and can avoid like this measuring and fail, thereby can reduce cutting off rate.2. if RNC decision is redistributed the Traffic Channel of UE and is other time slots, RNC will determine Traffic Channel redistributed and be which time slot so.Can be according to following algorithm:
1〉if measuring purpose is the GSM sub-district, then channel can be reassigned to the position of idle time slot more than or equal to 4 time slots.
2〉if measuring purpose is synchronous 1.28Mcps TDD sub-district, then up channel can be reassigned to other ascending time slots from TS1, from TS0, the TS6 time slot reassigns to other descending time slots with down channel.
3〉if measuring purpose is 3.84Mcps TDD sub-district or asynchronous 1.28Mcps TDD sub-district, then can carries out channel and redistribute according to following method:
For frame structure is the situation (except that TS0, comprising three ascending time slots and three descending time slots) of up-downgoing symmetrical structure, if current channel configuration situation is (TS1 is up, and TS6 is descending), then redistributes and is (TS3 is up, and TS4 is descending);
If current channel configuration situation is (TS3 is up, and TS4 is descending), then redistributes and be (TS1 is up, and TS6 is descending);
For other channel configuration situation, according to the minimum principle of timeslot number redistributed, current channel is redistributed to TS1 up, TS6 is descending) or (TS3 is up, and TS4 is descending).
For frame structure is the situation of up-downgoing dissymmetrical structure:
If frame structure is two up (or descending) time slots, four descending (or up) time slots (except that TS0) are then redistributed up (or descending) time slot of UE and are another up (or descending) time slot; With descending (or up) time slot of UE redistribute into current descending (or up) time slot non-conterminous descending (or up) time slot.
If frame structure is up (or descending) time slot, five descending (or up) time slots (except that TS0), then up (or descending) time slot with UE remains unchanged; Only descending (or up) time slot of UE is redistributed into current descending (or up) time slot non-conterminous descending (or up) time slot.
If frame structure is six ascending time slots (except that TSO), then descending time slot keeps TSO constant, with ascending time slot redistribute into the non-conterminous ascending time slot of current ascending time slot.
As shown in Figure 1, in the 1.28Mcps TDD system that the present invention proposes, between improved RNC control frequency/method step of inter-system handover measurement is as follows:
1) 101:RNC order UE measures Serving cell and the same frequency, alien frequencies and the different system cell that close on.Tested cell list is given UE by the RRC signaling.
2) 102:UE utilizes idle time slot to measure.In the starting stage of measuring, UE will utilize idle time slot to carry out with it synchronously by the synchronizing channel of Target cell, the process of Here it is Cell searching.When Serving cell and Target cell synchronously after, other parameters are measured, comprise signal strength signal intensity, path loss, signal to noise ratio etc.
3) 103:UE reports measurement result to RNC by the measurement report of RRC signaling.Two kinds of report modes are arranged: the one, the Event triggered mode is reported, and the 2nd, periodically report.RNC will specify in which way and report.
4) whether 104RNC will redistribute the Traffic Channel of UE according to the measurement report decision from UE that receives.
5) 105: be other time slots if the Traffic Channel of UE is redistributed in RNC decision, RNC will determine Traffic Channel redistributed and be which time slot so.
For example: the measurement purpose of UE is the asynchronous 1.28Mcps TDD of alien frequencies sub-district, and existing time slot allocation is (TS2 is up, and TS5 is descending), and frame structure is a symmetrical structure, and RNC determines that in step 4) UE is carried out channel to be redistributed.According to aforesaid algorithm, then (TS2 is up, and TS5 is descending) can be moved to (TS1 is up, and TS6 is descending) or (TS3 is up, and TS4 is descending) so, supposition here moves to (TS2 is up, and TS5 is descending) (TS1 is up, and TS6 is descending).Can utilize idle time slot to measure so.As shown in Figure 5, (A1+B1) be measurement window, synthesizer is included in the window switching time.This circulation can determine a secondary channel to redistribute.
If also measure less than, in next time circulation,, then (TS1 is up, and TS6 is descending) can be moved to (TS3 is up, and TS4 is descending) so according to aforesaid algorithm, can utilize idle time slot to measure so.As shown in Figure 4, A2 is a measurement window, and synthesizer is included in the window switching time.
Because traffic channel assignments is that the measurement window that (TS1 is up, and TS6 is descending) and (TS3 is up, and TS4 is descending) are constituted has almost covered entire frame, so, synchronous probability can be improved greatly.
6) 106:RNC finishes the channel reconfiguration course by RRC signaling and NBAP signaling, gives UE and Node B respectively with new Traffic Channel parameter, and in preset time, activates new channel configuration.So just Traffic Channel is moved to other time slots from current time slots.
7) if measurement does not have to finish and do not receive from the measurement of RNC to cease and desist order, then return step 2).
Claims (10)
1. between a control frequency and the method for inter-system handover measurement, comprise step:
1) radio network controller order user equipment (UE) is measured Serving cell and the alien frequencies or the different system cell that close on;
2) UE utilizes idle time slot to be undertaken synchronously by the synchronizing channel and the adjacent cells of adjacent cells;
3) if UE and adjacent cells synchronously on, utilize idle time slot that adjacent cells is measured;
4) UE sends to radio network controller with measurement report;
5) radio network controller is redistributed the Traffic Channel of UE according to the measurement report that receives, and Traffic Channel is moved to other time slots from current time slots.
2. by the described method of claim 1, it is characterized in that described step 5) comprises:
Radio network controller is redistributed the Traffic Channel of UE, so that the synchronizing channel of adjacent cells is arranged in the window of the idle time slot of UE.
3. by the described method of claim 1, if on it is characterized in that described step 4) UE is not synchronous, do not have measurement result in the measurement report.
4. by the described method of claim 1, if on it is characterized in that described step 4) UE is not synchronous, BSIC is not verified in the measurement report.
5. by the described method of claim 2, it is characterized in that described step 5) comprises:
Radio network controller is redistributed the Traffic Channel of UE, according to following algorithm:
If measuring purpose is the GSM sub-district, then channel is reassigned to the position of idle time slot more than or equal to 4 time slots.
6. by the described method of claim 2, it is characterized in that described step 5) comprises:
Radio network controller is redistributed the Traffic Channel of UE, according to following algorithm:
If measuring purpose is synchronous spreading rate 1.28Mcps TDD sub-district, then up channel is reassigned to other ascending time slots from time slot TS1, from time slot TSO, time slot TS6 reassigns to other descending time slots with down channel.
7. by the described method of claim 2, it is characterized in that described step 5) comprises:
Radio network controller is redistributed the Traffic Channel of UE, according to following algorithm:
If measuring purpose is spreading rate 3.84Mcps TDD sub-district or asynchronous spreading rate 1.28Mcps TDD sub-district, is the situation of up-downgoing symmetrical structure for frame structure, promptly frame structure is except that time slot TSO, three up and three descending time slots:
If current channel configuration situation is that time slot TS1 is up, time slot TS6 is descending, then redistribute up into time slot TS3, time slot TS4 is descending;
If current channel configuration situation is that time slot TS3 is up, time slot TS4 is descending, then redistribute up into time slot TS1, time slot TS6 is descending.
For other channel configuration situation, according to the minimum principle of timeslot number redistributed, current channel is redistributed to time slot TS1 up, time slot TS6 is descending or time slot TS3 is up, and time slot TS4 is descending.
8. by the described method of claim 2, it is characterized in that described step 5) comprises:
Radio network controller is redistributed the Traffic Channel of UE, according to following algorithm:
If measuring purpose is spreading rate 3.84Mcps TDD sub-district or asynchronous spreading rate 1.28Mcps TDD sub-district, for frame structure is the situation of up-downgoing dissymmetrical structure, if frame structure is except that time slot TSO, two upstream or downstream time slots, four downlink or uplink time slots:
Then the upstream or downstream time slot of UE is redistributed and be another upstream or downstream time slot; With the downlink or uplink time slot of UE redistribute into the non-conterminous downlink or uplink time slot of current downlink or uplink time slot.
9. by the described method of claim 2, it is characterized in that described step 5) comprises:
Radio network controller is redistributed the Traffic Channel of UE, according to following algorithm:
If measuring purpose is spreading rate 3.84Mcps TDD sub-district or asynchronous spreading rate 1.28Mcps TDD sub-district, for frame structure is the situation of up-downgoing dissymmetrical structure, if frame structure is except that time slot TSO, a upstream or downstream time slot, five downlink or uplink time slots:
Then the upstream or downstream time slot with UE remains unchanged; Only the downlink or uplink time slot of UE is redistributed into the non-conterminous downlink or uplink time slot of current downlink or uplink time slot;
10. by the described method of claim 2, it is characterized in that described step 5) comprises:
Radio network controller is redistributed the Traffic Channel of UE, according to following algorithm:
If measuring purpose is spreading rate 3.84Mcps TDD sub-district or asynchronous spreading rate 1.28Mcps TDD sub-district, is the situation of up-downgoing dissymmetrical structure for frame structure, if frame structure is except that time slot TSO, six ascending time slots:
Then descending time slot keeps time slot TSO constant, with ascending time slot redistribute into the non-conterminous ascending time slot of current ascending time slot.
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| CN 03154537 CN1578490A (en) | 2003-06-26 | 2003-08-18 | Measurement method for switching inter RNC control frquency and intersystem |
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| CN102932832B (en) * | 2011-08-10 | 2015-05-06 | 华为技术有限公司 | Multi-standard cell measurement method, multi-standard cell handover method and system, and equipment |
| CN103945544B (en) * | 2014-03-31 | 2017-06-27 | 上海华为技术有限公司 | Radio network controller, wireless communication system and channel method for reconfiguration |
-
2003
- 2003-08-18 CN CNA2008101101894A patent/CN101431776A/en active Pending
- 2003-08-18 CN CN 03154537 patent/CN1578490A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102026216A (en) * | 2009-09-23 | 2011-04-20 | 大唐移动通信设备有限公司 | Different system measuring method and equipment |
| CN102026216B (en) * | 2009-09-23 | 2014-08-06 | 电信科学技术研究院 | Different system measuring method and equipment |
| WO2014205833A1 (en) * | 2013-06-29 | 2014-12-31 | 华为技术有限公司 | Handover processing method, device and system |
| US9756541B2 (en) | 2013-06-29 | 2017-09-05 | Huawei Technologies Co., Ltd. | Handover processing method, apparatus, and system |
| CN105532055A (en) * | 2013-09-16 | 2016-04-27 | 高通股份有限公司 | Storage of base station identity code (BSIC) timing |
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| Publication number | Publication date |
|---|---|
| CN1578490A (en) | 2005-02-09 |
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