CN1317919C - Synchronous maintainment of active set in CDMA system - Google Patents
Synchronous maintainment of active set in CDMA system Download PDFInfo
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- CN1317919C CN1317919C CNB2004100482388A CN200410048238A CN1317919C CN 1317919 C CN1317919 C CN 1317919C CN B2004100482388 A CNB2004100482388 A CN B2004100482388A CN 200410048238 A CN200410048238 A CN 200410048238A CN 1317919 C CN1317919 C CN 1317919C
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Abstract
The present invention discloses a method for realizing the synchronous maintenance of an active set in a code division multiple access system. The method comprises the following steps: step A, whether UE is in a dedicated channel state or not is judged, if true, the step B is executed, else the process is finished; step B, a network side monitors each of subzone links in the active set of the UE; step C, the network side judges whether the up transmission time and the down transmission time of each of the subzone links in the active set both in the synchronized state according to the measuring results reported by the UE, if true, the step A is executed, else the step D is executed; step D, the network side adjust the down transmission time of each of the subzone links, which is not in the synchronized state, to be synchronous with the up transmission time of the UE according to the measuring results reported by the UE; the step A is returned. The present invention solves the problem of the synchronous maintenance of the active set; the defect that subzone links can not be newly added into the active set after the subzone links which are not in the synchronized state are deleted in the existing protocol is avoided, and the possibility of call drop is reduced.
Description
Technical field
The present invention relates to the soft hand-off in the wireless mobile communications field, relate in particular to the active set synchronization maintenance method in a kind of code division multiple access system.
Background technology
In cell mobile communication systems, for the utilance that improves frequency spectrum resource and the capacity of whole system, the radio-frequency power in the system must be confined within certain scope (sub-district).When travelling carriage (UE) leaves a sub-district and enters the another one sub-district, the signal of the original sub-district that it is received inevitable more and more a little less than, and the signal that enters the sub-district that it receives will be more and more stronger.In order to keep the communication quality of UE, UE must be transformed into the stronger new base station of signal, the switching in the mobile communication system that Here it is by original base station.
In the code division multiple access system, UE simultaneously sets up Radio Link with a plurality of sub-districts of same frequency and communicates, and all and be in the set of sub-district that the UE of cell private channel (CELL_DCH) state communicates the forming active set of being known as.Owing to moving of UE switched it between the different base station of same frequency, this process is called soft handover.In soft switching process, UE keeps communication link with former base station and new base station simultaneously, after the transmission quality that enters new base station and measure new base station satisfies index request, just disconnect and being connected of former base station, in addition, in soft handover, UE receives the identical information from two or more base station simultaneously, it is carried out diversity merging and judgement, thereby the received signal quality when improving UE and being in handover, and the data when keeping handover do not lose, and with respect to the rake mode, this diversity is called grand diversity.
In the code division multiple access system, normally carry out soft handover between the sub-district in order to make, UE must be in the reception sources cell signal can the receiving target sub-district signal, to reduce requirement to buffer capacity.Therefore adopt travelling carriage assisted hand-off (MAHO) strategy, be the poor of the UE x time that calculates time difference between Target cell and the cell-of-origin or Target cell and UE self, and report network, network is notified to target BS by radio network controller (RNC) with this time difference, so the target BS adjustment transmits and receives moment of signal to relevant travelling carriage, to compensate this time difference.
In the ideal case, the Frame of UE emission should be synchronous fully with the Frame that the base station receives, and the base station demodulation data of coming out just can be correct like this.But because the existence of frequency difference and relatively moving of UE make that up frame can not be synchronous fully with descending frame.In addition, long or link changes if UE is in the time of macro diversity status, and the up-downgoing Frame in UE and the active set between the base station of sub-district can not be fully corresponding, and promptly original active set will be affected synchronously.Therefore just need the synchronous of maintenance activity collection in order to keep macro diversity status.
On the other hand, according to the regulation of agreement 3GPP 25.214, the up x time of UE should be than descending fixed delay 1024 chips time of reception (chip) of correspondence, to guarantee the up-downgoing power control in the normal time slot.Delay in order to ensure a time slot of up and down power control, stipulate in the agreement that the interval between the frame of special physical controlling channel of upward (DPCCH)/Dedicated Physical Data Channel (DPDCH) the emission frame corresponding with the most important footpath of descending DPCCH/DPDCH that receives accordingly (First detected path) should be within (T0 ± 148) chip scope, wherein to differ from T0 be 1024chip the standard time.If the time interval surpasses this scope, then base station side just can not keep the frame synchronization with UE, and the error rate will improve greatly.
Therefore owing to reasons such as the motion of the existence of remaining frequency difference, UE and soft handovers, there is relative drift in federation between the clock of base station and UE.In order to make in the scope that drifts in agreement regulation, be necessary to take measures to control the launch time of the up-downgoing DPCH (DPCH) of UE and base station.
In the code division multiple access system, UE will come from the operation that signal of base station merges and be called descending merging.Descending merging to as if multilink in the identical frame of numbering, detailed process is: after UE receives that certain bar link label is the frame of n, in the time that limits, wait for the n frame of other links, the n frame of all links that will receive merges then, if in the time that limits, do not receive the n frame of other link, then do not carry out union operation.Usually, the time with the qualification that UE waited for is referred to as length of window.
When macro diversity status, owing to existence drift between the clock of base station, so UE can not be synchronous with all base station maintenances simultaneously.If Radio Link arrives the scope that the time of UE surpasses (T0 ± 148) chip, then UE when carrying out descending merging owing to be subjected to the restriction of length of window, to can not merge the link branch that overruns, merge gain, increase interference thereby reduced soft handover.In order to guarantee all time differences all in (T0 ± 148) chip, unique method is to adjust the launch time of base station down DPCH.
According to agreement 3GPP 25.215, the UE end will be measured UE reception-launch time poor (UE Rx-Txtime difference), and measurement result is reported, and then network side should be adjusted descending DPCH according to reported result launch time.But existing Release 1999 is not supported the adjustment of downlink time, so finish the way of the synchronous maintenance of active set at present is: RNC initiates the Radio Link of soft handover deletion UE Rx-Tx time difference above (T0 ± 148) chip scope.
Wherein the UE Rx-Tx time difference can report by the mode of cycle report or Event triggered, and network side is provided with two thresholdings at the UE Rx-Tx time difference: Upper threshold and Lower Threshold.
For the period measurement report manner, as its name suggests, UE is with preset time cycle reporting measurement result constantly.After network side was received report, whether the UE Rx-Tx time difference of judging every link within the scope that is made of Upper threshold and Lower Threshold, if be higher than Upper threshold or be lower than Lower Threshold, showed that then this link is in desynchronizing state.In present WCDMA system, the Upper threshold of period measurement report manner is generally (T0+148) chip, and Lower Threshold is generally (T0-148) chip.
And for the Event triggered mode, network side is handed down to UE with Upper threshold and Lower Threshold by the control of UE Rx-Tx time difference measurements earlier, the UE Rx-Tx time difference that only occurs certain bar link is when being higher than Upper threshold or being lower than the situation of Lower Threshold, just reported event report of UE.Adjudicate according to whether receiving 6F or 6G incident in the WCDMA system at present, particularly:
The 6F incident is the Rx-Tx time difference of certain wireless links in the UE active set to be higher than an absolute thresholding---(T0+148) chip;
The 6G incident is the Rx-Tx time difference of certain wireless links in the UE active set to be lower than an absolute thresholding---(T0-148) chip.
Threshold value in the above-mentioned dual mode also can be as the case may be by human configuration.
In a single day certain wireless links is in desynchronizing state or 6F or 6G incident takes place, and network side just discharges this Radio Link; According to present agreement, UE can be again at the Radio Link reporting measurement reports that has discharged, and they can not be added in the active set again so.
As shown in Figure 1, when using existing method to carry out the active set synchronous maintenance, the shortcoming that can occur is: when UE 1 moves to sub-district 2 from the sub-district, these two sub-districts become the active set cell of UE sometime, but because Target cell---the synchronous of sub-district 2 drifts about, cause its link deleted, owing to after this can't again it be added active set, so can cause call drop at last.
Summary of the invention
In view of this, main purpose of the present invention is to provide the synchronization maintenance method of the active set in a kind of code division multiple access system, solves the synchronous maintenance problem of active set.
For achieving the above object, the present invention proposes the method that realizes the active set synchronous maintenance in a kind of code division multiple access system, this method comprises:
When whether mobile station UE was in dedicated channel status, network side was monitored the UE Rx-Tx time difference of each sub-district institute respective links in the active set of this UE;
When the up launch time of each sub-district link and downlink time are in asynchronous regime in determining described active set, the UE Rx-Tx time difference in the measurement result that network side reports according to UE, the downlink dedicated physical transmit time that will be in the sub-district link of asynchronous regime is adjusted into can be synchronous up launch time with UE.
Described network side is monitored the UE Rx-Tx time difference of each sub-district institute respective links in the active set of this UE and is comprised:
Network side decision UE reporting measurement result's mode is cycle report manner or Event triggered mode;
Network side is provided with threshold value and indicates the parameter that UE will measure.
If network side decision UE reporting measurement result's mode is the cycle report manner, then described network side is provided with threshold value and indicates the parameter that UE will measure and comprises:
Network side self is being provided with two threshold values: Upper threshold and Lower Threshold, and issue UERx-Tx time difference measurements control messages to UE, indicate the parameter that UE need measure and report;
If network side decision UE reporting measurement result's mode is the Event triggered mode, then described network side is provided with threshold value and indicates the parameter that UE will measure and comprises:
Network side provides two absolute door limit values and indicates the parameter that UE need measure and report to UE by issuing UE Rx-Tx time difference measurements control messages.
Cycle, the parameter that UE need measure was: the UE Rx-Tx time difference during report manner; The parameter that reports is: the UE Rx-Tx time difference;
During the Event triggered mode, the parameter that UE need measure is: the UE Rx-Tx time difference; The parameter that reports is: 6F, 6G event report and UE Rx-Tx time difference.
If UE adopts cycle report manner reporting measurement result, the up launch time of sub-district link and downlink time are in asynchronous regime and comprise in then described definite active set:
UE with the preset time cycle constantly to network side reporting measurement result;
Network side judges that the UE Rx-Tx time difference of every link that UE reports is whether within Upper threshold and Lower Threshold scope, if be higher than Upper threshold or be lower than Lower Threshold, then this sub-district link is not in synchronous regime, network side record and the UE Rx-Tx time difference of storing this link;
If UE adopts Event triggered mode reporting measurement result, the up launch time of sub-district link and downlink time are in asynchronous regime and comprise in then described definite active set:
UE receives last absolute thresholding and the following absolute thresholding that network side issues by UE Rx-Tx time difference measurements control messages;
UE judges whether that the UE Rx-Tx time difference that link occurs is higher than absolute thresholding or is lower than the situation of absolute thresholding down, if have, then report 6F or 6G event report to network side, network side is received 6F or 6G event report, judge that then this sub-district link is not in synchronous regime, and the UE Rx-Tx time difference of this link of record storage.
Described network side is RNC, and the described downlink dedicated physical transmit time that will be in the sub-district link of asynchronous regime according to the UE Rx-Tx time difference is adjusted into and can comprises synchronously up launch time with UE:
By soft handover the Radio Link of Rx-Tx time difference overshoot scope is deleted from active set;
The UE Rx-Tx time difference that reports according to UE is adjusted the downward special physical channel launch time of the link of deleting, and obtains adjusted value;
By soft handover the link of being deleted is joined in the active set again, and the downward special physical channel of this link is configured to described adjusted value launch time.
The described downlink dedicated physical transmit time that will be in the sub-district link of asynchronous regime according to the UE Rx-Tx time difference is adjusted into and can comprises synchronously up launch time with UE:
The UE Rx-Tx time difference that reports according to UE is adjusted the downward special physical channel launch time of the Radio Link of Rx-Tx time difference overshoot scope, obtains adjusted value;
By soft handover the Radio Link of Rx-Tx time difference overshoot scope is deleted from active set;
By soft handover the link of being deleted is joined in the active set again, and the downward special physical channel of this link is configured to described adjusted value launch time.
The method of described adjustment downward special physical channel launch time is: if be T1 former downward special physical channel launch time of link, the UE Rx-Tx time difference of this link that UE reports is T
UeRxTx, then adjusted downward special physical channel launch time is T
UeRxTxWith the difference of standard time difference T0 and T1 with.
Use the present invention, when in code division multiple access system, carrying out the active set synchronous maintenance, whether up launch time and downlink time by the monitoring link are in synchronous regime, when time offset surpasses certain limit, the measurement result that base station controller reports according to UE, the downlink time that is not in the sub-district link of synchronous regime is adjusted into can be synchronous up launch time with UE.Particularly, the present invention has following beneficial effect:
1. be adjusted into downlink time of will not being in the sub-district link of synchronous regime can be synchronous up launch time with UE in the present invention, solved the synchronous maintenance problem of Radio Link in the active set.
2. the present invention is directly according to downlink time of time offset adjustment and configuration link, and do not carry out the operation of deletion link in the existing protocol, avoided the problem that possibly can't add again behind the link circuit deleting, reduces the possibility of call drop.
3. the present invention also can adjust the downlink time according to the measurement result that UE reports after the deletion link, increases the link of deletion then again in active set, and the downlink time of link is configured to adjusted value; Can also adjust downlink earlier and delete link after the time, and then deleted link is added in the active set again, and the downlink time of link is configured to adjusted value.These two kinds of ways are to increase to adjust the downlink time and the link of deleting is added two kinds of operations of active set again on the basis of existing protocol.Because back two kinds of ways just increase a small amount of algorithm to RNC on the existing protocol basis, to realize comparatively simply, the while has also been avoided the possibly problem that can't add active set again behind the link circuit deleting, has improved communication quality.
4. the present invention can not cause harmful effect to other equipment in the communication system, comprises UE and base station (NodeB).
Description of drawings
Fig. 1 distinguishes the schematic diagram of soft handover more for UE.
Fig. 2 is the overview flow chart of the active set synchronization maintenance method in the code division multiple access system of the present invention.
Fig. 3 is the flow chart of the embodiment that adjusts descending DPCH launch time among the present invention earlier behind the deletion link.
Fig. 4 is for adjusting descending DPCH deletes the embodiment of link after launch time flow chart earlier among the present invention.
Fig. 5 is for adjusting descending DPCH did not delete and increased the embodiment of link after launch time flow chart among the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
The present invention is a kind of method that solves active set synchronous maintenance in the code division multiple access system, according to shown in Figure 2, the present invention includes following steps:
The measurement result that step 204. network side reports according to UE, the downlink time that is not in the sub-district link of synchronous regime is adjusted into can be synchronous up launch time with UE; Return step 201.
The present invention can directly adjust and configurating downlink launch time, and does not carry out the deletion of link and increase operation; In addition, also can after the deletion link, adjust the downlink time, in active set, increase the link of deletion then again, and the downlink time of this link is configured to adjusted value according to the measurement result that UE reports; Can also adjust downlink earlier and delete link after the time, and then deleted link is added in the active set again, and the downlink time of this link is configured to adjusted value.The two kinds of ways in back are to increase to adjust the downlink time and the link of deleting is added two kinds of operations of active set again on the basis of existing protocol.Because back two kinds of ways just increase a small amount of algorithm on existing protocol, realize comparatively simply, so at first introduce this two kinds of schemes.
Below specific implementation of the present invention is described in detail.
Embodiment 1: adjust earlier descending DPCH launch time behind the deletion link.
As shown in Figure 3, in code division multiple access system active set synchronization maintenance method, adjust the situation of downlink time behind elder generation's deletion link, comprise following steps:
Step 301. judges whether UE is in dedicated channel status, if then execution in step 302, otherwise process ends;
Under dedicated channel status, when initially setting up Radio Link or increasing link, RNC preserves the descending DPCH launch time of every wireless links in the UE active set in local storage.
In the WCDMA system, descending DPCH is determined by vertical shift (Frame Offset) and sign indicating number skew (Chip Offset) launch time, Frame Offset scope is 0～255 frame, and the scope of Chip Offset is 0～38399 yard (chip), 1 frame=38400chip.
Step 302. network side is monitored the UE Rx-Tx time difference of each sub-district institute respective links in the active set of this UE;
In the code division multiple access system, UE simultaneously with himself active set in all sub-districts set up Radio Link and communicate.If the UE Rx-Tx time difference of Radio Link, then this link was in synchronous regime within prescribed limit; And when UE Rx-Tx time difference overshoot scope, this link is not in synchronous regime.So for the maintenance activity collection synchronously, network side must monitoring UE and active set in UE Rx-Tx time difference of all Radio Links between the sub-district.
For finishing the monitoring of link synchronization state, network side at first determines the mode of UE reporting measurement reports, and various threshold values are set then, and the judgement of carrying out for step 303 provides foundation.The detailed process of this step is as follows:
At first, network side decision UE reporting measurement result's mode is cycle report manner or Event triggered mode.
Then, if UE adopts the cycle report manner, then network side self is being provided with two threshold values: Upper threshold and Lower Threshold, and issuing UE Rx-Tx time difference measurements control messages to UE, the parameter that to indicate the parameter that UE need measure be the UE Rx-Tx time difference, need report is the UE Rx-Tx time difference; If UE adopts the Event triggered mode, then network side is by issuing UE Rx-Tx time difference measurements control messages, provide two absolute door limit values to UE, indicate the parameter that UE need measure simultaneously and be: UERx-Tx time difference, the parameter that need report are: 6F, 6G event report and UE Rx-Tx time difference.
Recommend according to agreement 3GPP25.311, in this method the period measurement report manner be limited to (T0+148) chip to the doorstep, the Xiamen is limited to (T0-148) chip; Two absolute thresholdings up and down in the Event triggered mode are respectively (T0+148) chip and (T0-148) chip.Above-mentioned T0 is 1024chip.Certainly, both threshold values also can be as the case may be by human configuration.
Step 303. is judged the UE Rx-Tx whether overshoot scope of time difference of link, if then execution in step 304, otherwise returns execution in step 301;
In this step, for the cycle report manner, at first, UE with the preset time cycle constantly to network side reporting measurement result.Then, network side is according to the threshold value that is provided with in the step 302, whether the UE Rx-Tx time difference of judging every link is within the scope that is made of Upper threshold and Lower Threshold, if be higher than Upper threshold or be lower than Lower Threshold, then execution in step 304, if the UE Rx-Tx time difference between last Lower Threshold, shows the up-downgoing of this link and keeps then returning step 301 synchronously launch time.
For the Event triggered mode, at first, UE receive network side in step 302 by UE Rx-Tx time difference measurements control messages issue on absolute thresholding and absolute thresholding down.Then, UE judges whether that the UE Rx-Tx time difference that some link occurs is higher than absolute thresholding or is lower than the situation of absolute thresholding down, 6F or 6G incident promptly take place, when having only the 6F of generation or 6G incident, UE just reports network side with event result, and then execution in step 304, if 6F, 6G incident do not take place, the up-downgoing that shows this link keeps then returning step 301 synchronously launch time.
The measurement result that step 304. network side record storage UE reports;
The measured value of UE Rx-Tx time difference in the measurement report that network side reports UE is stored in the local storage, is used for the descending DPCH launch time that link is readjusted in the back.
Step 305.RNC deletes the Radio Link of Rx-Tx time difference overshoot scope by soft handover from active set;
Step 306.RNC is according to the descending DPCH launch time of UE Rx-Tx time difference calculation procedure 305 links of deleting of storage in the step 304;
Calculate descending DPCH launch time, make difference between launch time of the time of reception of UE and base station within the scope of agreement regulation, thereby the base station that guarantees each sub-district in UE and the active set keeps synchronous.
The detailed process of adjusting descending DPCH launch time is as follows: if be T1 former descending DPCH launch time of this link, the UE Rx-Tx time difference of this link that UE reports is T
UeRxTx, be (T1+ (T then adjusted launch time
UeRxTx-T0)).This adjustment comprises two layers of meaning: if time difference T
UeRxTxGreater than T0, show that the descending DPCH of this link is too early launch time, then postpone (T
UeRxTx-T0) issue; If time difference T
UeRxTxLess than standard time difference T0, show that the descending DPCH of this link is slow excessively launch time, then shift to an earlier date (T0-T
UeRxTx) issue.
In the WCDMA system, from the local storage of RNC, obtain characterizing the original descending DPCH of this link the Frame Offset and Chip Offset of launch time after, the UE Rx-Tx time difference T of this link that reports according to UE
UeRxTx, adjust (T
UeRxTx-T0) chip, wherein T0 is 1024chip.The descending DPCH of this link can calculate according to following formula launch time after the reconstruction:
Frame?Offset’＝(Frame?Offset*38400+Chip?Offset+T
ueRxTx-T0)/38400；
Chip?Offset’＝(Frame?Offset*38400+Chip?Offset+T
ueRxTx-T0)％38400；
In two above-mentioned formula, "/" for rounding operation, " % " is for getting surplus operation.
This step is just calculated the numerical value that the descending DPCH of link should adjust launch time at network side, and adjusted value is not disposed to link.
Step 307.RNC initiates soft handover the link of deletion in the step 305 is joined in the active set again, and the descending DPCH of this link is configured to adjusted value in the step 306 launch time, returns execution in step 301 then.
In this step, when deleted link added active set again, RNC made the numerical value that the descending DPCH of link is configured to calculate in the step 306 launch time adjust and comes into force.
Present embodiment has just increased a small amount of algorithm to RNC on the basis of existing technology, realizes comparatively simply, is most preferred embodiment of the present invention.
Embodiment 2: adjust descending DPCH earlier and delete link after launch time.
As shown in Figure 4, in code division multiple access system active set synchronization maintenance method, adjust descending DPCH deletes link after launch time situation earlier, comprise following steps:
Step 401. judges whether UE is in dedicated channel status, if then execution in step 402, otherwise process ends;
Step 402. network side is monitored the UE Rx-Tx time difference of each sub-district institute respective links in the active set of this UE;
Step 403. is judged the UE Rx-Tx whether overshoot scope of time difference of link, if then execution in step 404, otherwise returns execution in step 401;
The measurement result that step 404. network side record storage UE reports;
Above-mentioned step 401～step 404 is identical with step 301～304 among the embodiment 1.
Step 405.RNC adjusts the descending DPCH launch time of the Radio Link of Rx-Tx time difference overshoot scope according to the Rx-Tx time difference of storage in the step 404;
The detailed process of adjusting descending DPCH launch time is as follows: if be T1 former descending DPCH launch time of this link, the UE Rx-Tx time difference is T
UeRxTx, be (T1+ (T then adjusted launch time
UeRxTx-T0)).This adjustment comprises two layers of meaning: if time difference T
UeRxTxGreater than T0, show that the descending DPCH of this link is too early launch time, then postpone (T
UeRxTx-T0) issue; If time difference T
UeRxTxLess than standard time difference T0, show that the descending DPCH of this link is slow excessively launch time, then shift to an earlier date (T0-T
UeRxTx) issue.
This step is just calculated the numerical value that the descending DPCH of link should adjust launch time at network side, and adjusted value is not disposed to link.
Step 406. is finished and is adjusted descending DPCH after launch time, and RNC deletes the Radio Link of Rx-Tx time difference overshoot scope by soft handover from active set;
Step 407.RNC joins in the active set again by the link of soft handover with deletion in the step 406, and the descending DPCH of this link is configured to adjusted value in the step 405 launch time, returns execution in step 401 then.
Present embodiment has increased and has adjusted descending DPCH launch time and the link of deletion is added the operation of active set again on the basis that keeps the existing protocol content, realizes comparatively simple.
Embodiment 3: adjust descending DPCH after launch time, do not delete and increase the operation of link.
As shown in Figure 5, in code division multiple access system active set synchronization maintenance method, adjust descending DPCH did not delete and increased link after launch time situation, comprise following steps:
Step 501. judges whether UE is in dedicated channel status, if then execution in step 402, otherwise process ends;
Step 502. network side is monitored the UE Rx-Tx time difference of each sub-district institute respective links in the active set of this UE;
Step 503. is judged the UE Rx-Tx whether overshoot scope of time difference of link, if then execution in step 504, otherwise returns execution in step 501;
The measurement result that step 504. network side record storage UE reports;
Above-mentioned step 501～504 are identical with step 301～304 among the embodiment 1.
The descending DPCH launch time that step 505.RNC adjusted and disposed the Radio Link of Rx-Tx time difference overshoot scope according to the Rx-Tx time difference of storage in the step 504, return execution in step 501 then;
The detailed process of adjusting descending DPCH launch time is as follows: if be T1 former descending DPCH launch time of this link, the UE Rx-Tx time difference is T
UeRxTx, be (T1+ (T then adjusted launch time
UeRxTx-T0)).This adjustment comprises two layers of meaning: if time difference T
UeRxTxGreater than T0, show that the descending DPCH of this link is too early launch time, then postpone (T
UeRxTx-T0) issue; If time difference T
UeRxTxLess than standard time difference T0, show that the descending DPCH of this link is slow excessively launch time, then shift to an earlier date (T0-T
UeRxTx) issue.
After the adjusted value of the descending DPCH launch time that calculates link, RNC disposes this adjusted value to link, makes to adjust to come into force.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, realize the method for active set synchronous maintenance in a kind of code division multiple access system, it is characterized in that this method comprises:
When mobile station UE was in dedicated channel status, network side was monitored the UE Rx-Tx time difference of each sub-district institute respective links in the active set of this UE;
When the up launch time of sub-district link and downlink time were in asynchronous regime in determining described active set, the downlink dedicated physical transmit time that the UE Rx-Tx time difference in the measurement result that network side reports according to UE will be in the sub-district link of asynchronous regime is adjusted into can be synchronous up launch time with UE.
2, the method for claim 1 is characterized in that, described network side is monitored the UE Rx-Tx time difference of each sub-district institute respective links in the active set of this UE and comprised:
Network side decision UE reporting measurement result's mode is cycle report manner or Event triggered mode;
Network side is provided with threshold value and indicates the parameter that UE will measure.
3, method as claimed in claim 2 is characterized in that, if network side decision UE reporting measurement result's mode is the cycle report manner, then described network side is provided with threshold value and indicates the parameter that UE will measure and comprises:
Network side self is being provided with two threshold values: Upper threshold and Lower Threshold, and issue UERx-Tx time difference measurements control messages to UE, indicate the parameter that UE need measure and report;
If network side decision UE reporting measurement result's mode is the Event triggered mode, then described network side is provided with threshold value and indicates the parameter that UE will measure and comprises:
Network side provides two absolute door limit values and indicates the parameter that UE need measure and report to UE by issuing UE Rx-Tx time difference measurements control messages.
4, method as claimed in claim 3 is characterized in that, the cycle, the parameter that UE need measure was: the UE Rx-Tx time difference during report manner; The parameter that reports is: the UE Rx-Tx time difference;
During the Event triggered mode, the parameter that UE need measure is: the UE Rx-Tx time difference; The parameter that reports is: 6F, 6G event report and UE Rx-Tx time difference.
5, method as claimed in claim 2 is characterized in that, if UE adopts cycle report manner reporting measurement result, the up launch time of sub-district link and downlink time are in asynchronous regime and comprise in then described definite active set:
UE with the preset time cycle constantly to network side reporting measurement result;
Network side judges that the UE Rx-Tx time difference of every link that UE reports is whether within Upper threshold and Lower Threshold scope, if be higher than Upper threshold or be lower than Lower Threshold, then this sub-district link is not in synchronous regime, network side record and the UE Rx-Tx time difference of storing this link;
If UE adopts Event triggered mode reporting measurement result, the up launch time of sub-district link and downlink time are in asynchronous regime and comprise in then described definite active set:
UE receives last absolute thresholding and the following absolute thresholding that network side issues by UE Rx-Tx time difference measurements control messages;
UE judges whether that the UE Rx-Tx time difference that link occurs is higher than absolute thresholding or is lower than the situation of absolute thresholding down, if have, then report 6F or 6G event report to network side, network side is received 6F or 6G event report, judge that then this sub-district link is not in synchronous regime, and the UE Rx-Tx time difference of this link of record storage.
6, the method for claim 1 is characterized in that, the described downlink dedicated physical transmit time that will be in the sub-district link of asynchronous regime according to the UE Rx-Tx time difference is adjusted into and can comprises synchronously up launch time with UE:
By soft handover the Radio Link of Rx-Tx time difference overshoot scope is deleted from active set;
The UE Rx-Tx time difference that reports according to UE is adjusted the downward special physical channel launch time of the link of deleting, and obtains adjusted value;
By soft handover the link of being deleted is joined in the active set again, and the downward special physical channel of this link is configured to described adjusted value launch time.
7, the method for claim 1 is characterized in that, the described downlink dedicated physical transmit time that will be in the sub-district link of asynchronous regime according to the UE Rx-Tx time difference is adjusted into and can comprises synchronously up launch time with UE:
The UE Rx-Tx time difference that reports according to UE is adjusted the downward special physical channel launch time of the Radio Link of Rx-Tx time difference overshoot scope, obtains adjusted value;
By soft handover the Radio Link of Rx-Tx time difference overshoot scope is deleted from active set;
By soft handover the link of being deleted is joined in the active set again, and the downward special physical channel of this link is configured to described adjusted value launch time.
8, as claim 1,6 or 7 described methods, it is characterized in that, the method of described adjustment downward special physical channel launch time is: if be T1 former downward special physical channel launch time of link, the UE Rx-Tx time difference of this link that UE reports is T
UeRxTx, then adjusted downward special physical channel launch time is T
UeRxTxWith the difference of standard time difference T0 and T1 with.
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| CN101043292B (en) * | 2006-03-24 | 2011-05-18 | 大唐移动通信设备有限公司 | Packet scheduling method of high-speed downlink packet access system and base station using the same |
| CN101267245B (en) * | 2007-03-15 | 2012-09-26 | 中兴通讯股份有限公司 | Method for improving uplink synchronization detection efficiency in time division synchronous code division multi-address system |
| DK2124488T3 (en) | 2007-08-08 | 2016-01-25 | Huawei Tech Co Ltd | Time Adjustment in a radio communication system. |
| CN109831809B (en) | 2017-11-23 | 2023-02-10 | 华为技术有限公司 | Scheduling method and device |
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| CN1372423A (en) * | 2001-02-22 | 2002-10-02 | Lg电子株式会社 | Method for control timing ot uplink synchronous transmission scheme |
| CN1437803A (en) * | 2000-05-22 | 2003-08-20 | 高通股份有限公司 | Method and apparatus for soft handoff in a CDMA communication system |
| US6657988B2 (en) * | 2001-01-12 | 2003-12-02 | Nokia Mobile Phones Ltd. | Method and apparatus for timing adjustment for uplink synchronous transmission in wide code division multiple access |
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| CN1437803A (en) * | 2000-05-22 | 2003-08-20 | 高通股份有限公司 | Method and apparatus for soft handoff in a CDMA communication system |
| US6657988B2 (en) * | 2001-01-12 | 2003-12-02 | Nokia Mobile Phones Ltd. | Method and apparatus for timing adjustment for uplink synchronous transmission in wide code division multiple access |
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