CN101835224A - Switching method and terminal of HSPA (High Speed Packet Access) channel - Google Patents
Switching method and terminal of HSPA (High Speed Packet Access) channel Download PDFInfo
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- CN101835224A CN101835224A CN200910079384A CN200910079384A CN101835224A CN 101835224 A CN101835224 A CN 101835224A CN 200910079384 A CN200910079384 A CN 200910079384A CN 200910079384 A CN200910079384 A CN 200910079384A CN 101835224 A CN101835224 A CN 101835224A
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Abstract
The invention provides a switching method and a terminal of an HSPA (High Speed Packet Access) channel. By utilizing the downlink synchronous difference between a resource district and a target district and aiming at transmission TA (Time Advance) of the resource district, the terminal confirms TA aiming at the target district, and switches an HSPA channel to the target district aiming at the TA of the target district after receiving a switching command; and a mode of pre-synchronously switching the HSPA channel is adopted to prevent UE (User Equipment) from reinitiating a synchronous establishing process to the target district to switch the HSPA channel to the target district, reduce switching time delay and lessen interference brought by the switching process, thereby improving the switching performance.
Description
Technical field
The present invention relates to mobile communication technology, particularly a kind of changing method of high-speed packet access signal channel and terminal.
Background technology
In order to satisfy the mobility requirement of user terminal (UE),, UE guarantees speech quality when can carrying out handover mechanism when a sub-district moves to the another one sub-district.Usually the residing sub-district of UE is called the cell-of-origin before will switching generation, and the corresponding base station of inserting is called source base station, and the sub-district that will switch to is called Target cell, and the base station of corresponding access is called target BS.
UE can give radio network controller (RNC) with the reporting district information that measures by measurement report, RNC determines whether to carry out according to the cell information that reports and switches, switch if determine to carry out, then RNC can set up corresponding channel and reserve relevant switchable resource at target BS, and some switching time is set, send switching command to UE, comprise UE in this switching command in target BS communicate by letter necessary dedicated transmission channel (DCH) resource allocation information and control information.UE begins from source base station to switch to target BS when switching time, point arrived, and source base station stops the service for UE, and target BS begins to provide service for UE.Need to prove that source base station and target BS can be same base station entity, promptly UE switches to another sub-district of this base station entity from a sub-district of a base station entity.
In present time division SCDMA (TD-SCDMA) system, can realize baton handover at DCH, in the TD-SCDMA system, DCH is mapped on the DPCH (DPCH), particularly, up DCH is mapped on the up DPCH, and descending DCH is mapped on the descending DPCH.The process of baton handover is: when switching time, point arrived, UE switched to Target cell with up DPCH earlier, more descending DPCH is switched to Target cell behind the T1 duration.This mode need not UE and rebulids synchronizing process with Target cell, has less handover delay.
High-speed packet inserts enhancing dedicated channel (E-DCH) that (HSPA) technology introduces and high-speed downlink shared channel (HS-DSCH) and is different from the DPCH that DCH:DCH is mapped to from feature and does not need extra physical layer control channel, and the DCH needed control information of decoding is also carried by DPCH.And for E-DCH, E-DCH is mapped to and strengthens uplink physical channel (E-PUCH), and E-PUCH needs extra E-DCH absolute grant channel (E-AGCH) and hybrid automatic retransmission request to confirm indicating channel (E-HICH); Be mapped on the High-Speed Physical Downlink Shared Channel (HS-PDSCH) for HS-DSCH, HS-PDSCH needs extra High-Speed Shared Control Channel (HS-SCCH) and high-speed shared information channel (HS-SICH) equally.If up E-PUCH is switched to Target cell earlier, and channels such as descending E-HICH and E-AGCH are stayed the cell-of-origin, then are difficult to must realize mutual scheduling in real time, and therefore, the mode of baton handover can not be applied to the HSPA channel.Wherein, E-DCH and HS-DSCH and corresponding HS-SCCH, HS-SICH, E-PUCH, E-AGCH and E-HICH are referred to as the HSPA channel.
In the present HSPA system, still adopt the mode of direct-cut operation at the handover mechanism of HSPA channel, promptly when switching, UE initiates to set up synchronously process and Target cell again to Target cell and sets up synchronously and switch to Target cell, this mode can produce long handover delay, and brings bigger interference.
Summary of the invention
In view of this, the invention provides a kind of changing method and terminal of HSPA channel, so that reduce the handover delay of HSPA channel switching and the interference that reduces to bring in the handoff procedure.
A kind of changing method of HSPA channel, this method comprises:
UE utilize between cell-of-origin and the Target cell down-going synchronous difference and at transmission TA pre-set time of cell-of-origin, determine TA at Target cell;
After receiving switching command, the HSPA channel is switched to Target cell according to TA at Target cell.
A kind of switching terminal of HSPA channel, this terminal comprises: lead determining unit, switching command receiving element and switching performance element;
Described lead determining unit, be used to utilize between cell-of-origin and the Target cell down-going synchronous difference and at transmission TA pre-set time of cell-of-origin, determine TA at Target cell;
Described switching command receiving element is used to receive switching command;
Described switching performance element is used for after described switching command receiving element receives switching command, according to described TA at Target cell the HSPA channel is switched to Target cell.
As can be seen from the above technical solutions, in method provided by the invention and the terminal, terminal utilize between cell-of-origin and the Target cell down-going synchronous difference and at the TA of cell-of-origin, determine TA at Target cell, after receiving switching command, according to TA the HSPA channel is switched to Target cell at Target cell, promptly the HSPA channel being carried out mode that presynchronization switches has avoided UE to initiate to set up synchronously process again to Target cell the HSPA channel is switched to Target cell, the interference that has reduced handover delay and reduced to bring in the handoff procedure, thus performance of handoffs improved.
Description of drawings
The method flow diagram that Fig. 1 provides for the embodiment of the invention one;
The method flow diagram that Fig. 2 provides for the embodiment of the invention two;
The UE structure chart that Fig. 3 provides for the embodiment of the invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
Method provided by the invention mainly comprises: UE utilize between cell-of-origin and the Target cell down-going synchronous difference (OTD) and at transmission pre-set time (TA) of cell-of-origin, determine TA at Target cell; After receiving switching command, the HSPA channel is switched to Target cell according to TA at Target cell.
Owing to may there be two kinds of channel configurations in the HSPA system: a kind of is only to have the HSPA channel, and another kind is HSPA channel and DPCH channel and deposits.Enumerating specific embodiment below respectively is described in detail above-mentioned two kinds of situations.
Embodiment one, only there is a situation of HSPA channel.The method flow diagram that Fig. 1 provides for the embodiment of the invention, as shown in Figure 1, this method can may further comprise the steps:
Step 101:UE utilizes the pilot signal of each sub-district that receives to measure, and to the RNC reporting measurement reports, obtain down-going synchronous difference between each adjacent sub-district and the cell-of-origin by this measurement, and, calculate TA at each the adjacent sub-district that measures in conjunction with TA at the cell-of-origin.
UE may move to other sub-district from a sub-district in moving process, when being in the overlay area of a plurality of sub-districts, can receive pilot signal from a plurality of sub-districts, can measure the signal(l)ing condition of each sub-district, synchronizing information etc. by this pilot signal UE, and the down-going synchronous situation of each sub-district and cell-of-origin compared the down-going synchronous difference of obtaining each adjacent sub-district and cell-of-origin, wherein comprise the down-going synchronous difference between source base station and the target BS certainly.
Wherein, at the calculating of the TA of each the adjacent sub-district that measures can for: the down-going synchronous difference OTD between this neighbour sub-district and the cell-of-origin with at the cell-of-origin TA's and.Need to prove, poor if OTD is the down-going synchronous of the down-going synchronous of adjacent sub-district and cell-of-origin, then when calculating the TA of adjacent sub-district, adopt cell-of-origin and OTD TA's and form; If OTD is that the down-going synchronous of the down-going synchronous of cell-of-origin and adjacent sub-district is poor, then when calculating the TA of adjacent sub-district, adopt the form of difference of the TA of cell-of-origin and OTD.
After in subsequent step, having determined Target cell, then can be directly obtain TA at Target cell from the TA that calculates at each adjacent sub-district.
The measurement report that step 102:RNC reports according to UE judges when satisfying switching condition, and satisfies between the target BS of switching condition and set up communication link, and sends switching command to terminal.
Behind the measurement report that RNC reports according to UE, can judge whether to exist the sub-district of satisfying switching condition according to one or more factors in the signal quality of each sub-district, signal strength signal intensity, load condition etc.When switching condition is satisfied in definite certain sub-district, determine that this sub-district is a Target cell, set up communication link with the target BS under this sub-district, set up corresponding channel and reserve relevant switchable resource for the switching of UE, send switching command to terminal then.In the switching command except comprise Target cell such as the relevant informations such as physical channel configuration information, transmission channel reconfiguration information, radio bearer configuration information, also may comprise and switch activationary time dot information and uplink synchronous control information.This step is a prior art, no longer specifically discusses at this.
After step 103:UE receives switching command, judge in the uplink synchronous control information in the switching command whether carry synchronization parameter, if not, execution in step 104; If carry out according to the switching mode of HSPA channel in the prior art.
If UE receive in the switching command uplink synchronous control information (Uplink TimingAdvance Control) for enable the sign (enabled), and wherein carried synchronization parameter (Synchronisation Parameters), then UE can be according to the content of this synchronization parameter, switching mode according to HSPA channel in the prior art is carried out, promptly in handoff procedure, UE utilizes the synchronization parameter in the switching command to initiate to set up synchronously process again and Target cell is set up synchronously and switched to Target cell to Target cell.
If do not carry synchronization parameter in the uplink synchronous control information, then UE can adopt the mode of presynchronization switching to the HSPA channel, is specially step 104.
Need to prove: the present invention also can not judge in the uplink synchronous control information in the switching command whether carry synchronization parameter, promptly whether carry the mode that synchronization parameter all adopts presynchronization to switch to the HSPA channel in the uplink synchronous control information in the switching command, but bigger to the existing protocol change like this.
Step 104: the TA at target BS according to determining switches to Target cell with the HSPA channel when the indicated switching activationary time point of switching command comes into force.
In addition, if comprising, switching command do not switch the activationary time dot information, the switching activationary time point of then representing the switching command indication is " (Now) immediately ", then UE switches to Target cell with up HSPA channel and descending HSPA channel immediately simultaneously after receiving switching command, and utilizes the TA at target BS to send up HSPA channel at Target cell.
Switch the activationary time dot information if switching command comprises, then when switching activationary time point comes into force, up HSPA channel and descending HSPA channel are switched to Target cell simultaneously, and utilize TA to send up HSPA channel at Target cell at target BS.Before switching activationary time point comes into force, still in the cell-of-origin, send up HSPA channel and receive descending HSPA channel.
If carried medium access control (MAC) agreement replacement indication in the switching command, then after descending HSPA channel switches to Target cell, carried out the MAC agreement of HSPA channel is reset to the HSPA channel.
The situation of embodiment two, HSPA channel and DPCH coexistence.The method flow diagram that Fig. 2 provides for the embodiment of the invention, as shown in Figure 2, this method mainly may further comprise the steps:
Step 201:UE utilizes the pilot signal of each sub-district that receives to measure, and to the RNC reporting measurement reports, obtain the down-going synchronous difference of each adjacent sub-district and cell-of-origin by this measurement, and, calculate TA at each the adjacent sub-district that measures in conjunction with TA at the cell-of-origin.
The measurement report that step 202:RNC reports according to UE judges when satisfying switching condition, and satisfies between the target BS of switching condition and set up communication link, and sends switching command to terminal.
Above-mentioned steps 201 and step 202 are identical with step 101 and step 102 in Fig. 1 flow process, repeat no more.
After step 203:UE receives switching command, judge in the uplink synchronous control information in the switching command whether carry synchronization parameter, if not, execution in step 204; If carry out according to the switching mode of HSPA channel and DPCH in the prior art.
If the uplink synchronous control information that UE receives in the switching command identifies for enabling, and wherein carried synchronization parameter, then UE can be according to the content of this synchronization parameter, switching mode according to HSPA channel and DPCH in the prior art is carried out, promptly in handoff procedure, UE utilizes the synchronization parameter in the switching command to initiate synchronously and set up process again to Target cell and sets up synchronous with Target cell and switch to Target cell.
If do not carry synchronization parameter in the uplink synchronous control information, then can continue to carry out following steps.
Step 204: judge whether to carry in the switching command and switch the activationary time dot information, if, execution in step 205; Otherwise, execution in step 206.
Switch the activationary time dot information if carry in the switching command, UE is switching the operation that begins to switch when the activationary time point comes into force so; Switch the activationary time dot information if carry in the switching command, show that then switching the activationary time point comes into force, UE begins the operation of switching immediately.
Step 205: when switching the activationary time point and come into force, according to up DPCH, descending DPCH and up HSPA channel, descending HSPA channel being switched to Target cell, process ends simultaneously at the TA of target BS.
Carry in the switching command and switch the activationary time dot information, then HSPA channel and DPCH are all carried out the presynchronization switching, promptly when switching activationary time point comes into force, the TA at target BS that utilization precomputes sends up HSPA channel and up DPCH at Target cell, and monitors descending HSPA channel and descending DPCH at Target cell.
If also carried medium access control (MAC) agreement replacement indication in the switching command, then after descending HSPA channel switches to Target cell, carried out the MAC agreement of HSPA channel is reset to the HSPA channel.
Step 206: the TA at target BS according to determining switches to Target cell with up DPCH immediately, and behind duration T1, descending DPCH and up HSPA channel, descending HSPA channel is switched to Target cell, process ends simultaneously.
The situation of this step correspondence is to switch the activationary time point to come into force, and in this case DPCH is carried out the mode of baton handover, promptly earlier up DPCH is switched to Target cell according to the TA at target BS, and descending DPCH still monitors in the cell-of-origin.For the HSPA channel, descending HSPA channel is also monitored in the cell-of-origin in the time period at T1, up HSPA channel can send in the cell-of-origin, also can stop to send, after duration T1 finishes, switch to Target cell simultaneously, wherein, up HSPA channel switches the back and sends according to the TA at Target cell at Target cell.
In the process of this duration T1, if UE receives schedule information by descending HSPA channel, then UE can give cell-of-origin or RNC with the feedback information that is scheduled, stops scheduling to this UE with the notification source sub-district.In the present embodiment, the feedback of the information that UE can be scheduled by up HSPA channel, the also feedback of the information that can be scheduled by up DPCH, when adopting up DPCH to feed back, because up DPCH has switched to Target cell, therefore, the informational needs that is scheduled to RNC, is sent to the source base station of cell-of-origin via Target cell again by RNC.
Equally, media interviews control (MAC) agreement replacement of HSPA channel is indicated, then after descending HSPA channel switches to Target cell, carry out the MAC agreement of HSPA channel is reset if also carried in the switching command.
More than be the description that method provided by the present invention is carried out, below UE provided by the present invention be described in detail.The structure chart of the UE that Fig. 3 provides for the embodiment of the invention, as shown in Figure 3, this UE can comprise: lead determining unit 300, switching command receiving element 310 and switch performance element 320.
Lead determining unit 300, be used to utilize between cell-of-origin and the Target cell down-going synchronous difference and at transmission TA pre-set time of cell-of-origin, determine TA at Target cell.
Need to prove that cell-of-origin that this lead determining unit 300 is utilized and the down-going synchronous difference between the Target cell are that the measuring unit among the UE gets by the measurement to pilot signal.In addition, the report reporting unit among the UE can send measurement report to RNC, and RNC is when determining to satisfy switching condition, to the UE switching command.Because wherein measuring unit and report reporting unit are existing unit in the prior art, do not repeat them here, and be also not shown among the figure.
Switching command receiving element 310 is used to receive switching command.
In the switching command except comprise Target cell such as the relevant informations such as physical channel configuration information, transmission channel reconfiguration information, radio bearer configuration information, also may comprise and switch activationary time dot information and uplink synchronous control information.
Switch performance element 320, be used for after switching command receiving element 310 receives switching command, the HSPA channel is switched to Target cell according to TA at Target cell.
Wherein, switching performance element 320 can specifically comprise: first judgment sub-unit 321, first is switched subelement 322 and second and is switched subelement 323.
First judgment sub-unit 321 is used for judging in the uplink synchronous control information of switching command whether carry synchronization parameter, if not, then switches subelement 322 to first and sends switching notice; If then switch subelement 323 and send switching notice to second.
First switches subelement 322, after being used to receive switching notice, according to the TA at Target cell the HSPA channel is switched to Target cell.
Second switches subelement 323, after being used to receive switching notice, utilizes synchronization parameter after Target cell initiates to set up process synchronously, and the HSPA channel is switched to Target cell.
Comprise following two kinds of situations:
If only there is the HSPA channel, first switches subelement 322 does not carry in switching command when switching the activationary time dot information, according to the TA at Target cell the HSPA channel is switched to Target cell immediately; In switching command, carry switching time during dot information, after the indicated switching activationary time point of switching command comes into force, the HSPA channel is switched to Target cell according to TA at Target cell.
If there is HSPA channel and DPCH coexistence, first switches subelement 322 carries in switching command when switching the activationary time dot information, switching command switches to Target cell with HSPA channel and DPCH simultaneously according to the TA at Target cell after indicated switching time, point came into force; In switching command, do not carry when switching the activationary time dot information, according to TA at target BS, immediately up DPCH is switched to Target cell, and behind default duration T1, descending DPCH is switched to Target cell, according to TA the HSPA channel is switched to Target cell simultaneously at target BS.
Further, this UE can also comprise: MAC agreement reset cell 330, be used for carrying when the MAC agreement of HSPA channel reset indication,, the MAC agreement of HSPA channel reset switching after performance element 320 switches to Target cell with the HSPA channel at switching command.
In addition, this terminal also comprises: scheduling condition feedback unit 340, be used for process at duration T1, after this terminal receives schedule information by descending HSPA channel, the feedback information that this terminal is scheduled is given the cell-of-origin or is fed back to the cell-of-origin via RNC, stops scheduling to this terminal with the notification source sub-district.
By above description as can be seen, in method provided by the invention and the terminal, terminal utilize between cell-of-origin and the Target cell down-going synchronous difference and at the TA of cell-of-origin, determine TA at Target cell, after receiving switching command, according to TA the HSPA channel is switched to Target cell at Target cell, promptly the HSPA channel being carried out mode that presynchronization switches has avoided UE to initiate to set up synchronously process again to Target cell the HSPA channel is switched to Target cell, the interference that has reduced handover delay and reduced to bring in the handoff procedure, thus performance of handoffs improved.
And, and the method that provided of invention is only to exist under the HSPA channel or the situation of HSPA channel and DPCH coexistence all to be suitable for, and concrete solution is provided respectively.
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 made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (13)
1. a high-speed packet inserts the changing method of HSPA channel, it is characterized in that this method comprises:
UE utilize between cell-of-origin and the Target cell down-going synchronous difference and at transmission TA pre-set time of cell-of-origin, determine TA at Target cell;
After receiving switching command, the HSPA channel is switched to Target cell according to TA at Target cell.
2. method according to claim 1, it is characterized in that, also comprise before according to TA the HSPA channel being switched to Target cell described: judge in the uplink synchronous control information in the switching command whether carry synchronization parameter at Target cell, if not, then the continuation execution is described switches to Target cell according to the TA at Target cell with the HSPA channel; If, then utilize described synchronization parameter after Target cell initiates to set up process synchronously, the HSPA channel is switched to Target cell.
3. method according to claim 1 and 2, it is characterized in that, if only there is the HSPA channel, do not switch the activationary time dot information if carry in the described switching command, then described UE carries out described according to the step that the HSPA channel is switched to Target cell at the TA of Target cell immediately; If carry dot information switching time in the described switching command, when then described UE comes into force at the indicated switching activationary time point of switching command, carry out describedly the HSPA channel is switched to Target cell according to TA at Target cell.
4. method according to claim 2 is characterized in that, if there is HSPA channel and DPCH coexistence, describedly according to the TA at Target cell the HSPA channel switched to Target cell and comprises:
Switch the activationary time dot information if carry in the described switching command, then when indicated switching time, point came into force, simultaneously HSPA channel and DPCH are switched to Target cell according to described TA at Target cell at described switching command;
Do not switch the activationary time dot information if carry in the described switching command, then according to described TA at target BS, immediately up DPCH is switched to Target cell, and behind default duration T1, descending DPCH is switched to Target cell, according to described TA the HSPA channel is switched to Target cell simultaneously at target BS.
5. according to claim 1,2 or 4 described methods, it is characterized in that, if also carry media access control MAC protocol replacement indication in the described switching command, then after the HSPA channel is switched to Target cell, the MAC agreement of HSPA channel reset to the HSPA channel.
6. method according to claim 4, it is characterized in that, in the process of described duration T1, if described UE receives schedule information by descending HSPA channel, then the feedback information that this UE is scheduled is given the cell-of-origin or is fed back to the cell-of-origin via radio network controller (RNC), stops scheduling to this UE with the notification source sub-district.
7. according to claim 1,2,4 or 6 described methods, it is characterized in that described HSPA channel comprises a kind of with in the lower channel at least: strengthen dedicated channel E-DCH, high-speed downlink shared channel HS-DSCH, strengthen uplink physical channel E-PUCH, hybrid automatic retransmission request is determined indicating channel E-HICH, strengthen the absolute grant channel E-AGCH or the High-Speed Physical Downlink Shared Channel HS-PDSCH of dedicated channel.
8. the switching terminal of a HSPA channel is characterized in that, this terminal comprises: lead determining unit, switching command receiving element and switching performance element;
Described lead determining unit, be used to utilize between cell-of-origin and the Target cell down-going synchronous difference and at transmission TA pre-set time of cell-of-origin, determine TA at Target cell;
Described switching command receiving element is used to receive switching command;
Described switching performance element is used for after described switching command receiving element receives switching command, according to described TA at Target cell the HSPA channel is switched to Target cell.
9. terminal according to claim 8 is characterized in that, described switching performance element comprises: first judgment sub-unit, first is switched subelement and second and is switched subelement;
Described first judgment sub-unit is used for judging in the uplink synchronous control information of switching command whether carry synchronization parameter, if not, then switches subelement to described first and sends switching notice; If then switch subelement and send switching notice to described second;
Described first switches subelement, after being used to receive switching notice, according to the TA at described Target cell the HSPA channel is switched to Target cell;
Described second switches subelement, after being used to receive switching notice, utilizes described synchronization parameter after Target cell initiates to set up process synchronously, and the HSPA channel is switched to Target cell.
10. terminal according to claim 9, it is characterized in that, if only there is the HSPA channel, described first switches subelement does not carry in described switching command when switching the activationary time dot information, according to described TA at Target cell the HSPA channel is switched to Target cell immediately; In described switching command, carry switching time during dot information, after the indicated switching activationary time point of described switching command comes into force, the HSPA channel is switched to Target cell according to described TA at Target cell.
11. terminal according to claim 9, it is characterized in that, if there is HSPA channel and DPCH coexistence, described first switches subelement carries in described switching command when switching the activationary time dot information, described switching command switches to Target cell with HSPA channel and DPCH simultaneously according to described TA at Target cell after indicated switching time, point came into force; In described switching command, do not carry when switching the activationary time dot information, according to described TA at target BS, immediately up DPCH is switched to Target cell, and behind default duration T1, descending DPCH is switched to Target cell, according to described TA the HSPA channel is switched to Target cell simultaneously at target BS.
12. terminal according to claim 8, it is characterized in that, this terminal also comprises: MAC agreement reset cell, be used for carrying when the media access control MAC protocol of HSPA channel reset indication at switching command, after described switching performance element switches to Target cell with the HSPA channel, the MAC agreement of HSPA channel is reset.
13. terminal according to claim 11, it is characterized in that, this terminal also comprises: scheduling condition feedback unit, be used for after this terminal receives schedule information by descending HSPA channel, the feedback information that this terminal is scheduled is given the cell-of-origin or is fed back to the cell-of-origin via RNC, stops scheduling to this terminal with the notification source sub-district.
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