CN100473209C - Method of TDD WCDMA system shared channel switch - Google Patents
Method of TDD WCDMA system shared channel switch Download PDFInfo
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- CN100473209C CN100473209C CNB2007100016279A CN200710001627A CN100473209C CN 100473209 C CN100473209 C CN 100473209C CN B2007100016279 A CNB2007100016279 A CN B2007100016279A CN 200710001627 A CN200710001627 A CN 200710001627A CN 100473209 C CN100473209 C CN 100473209C
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Abstract
This invention relates to an improved in-line switch method for the TDD WCDMA system including: when the in-line switch judgement of a radio network controller RNC is triggered, the connection of a UE and the old local area is kept, and RNC decides to add a radio link to a new local area for said UE and the UE carries out selective receiving and emitting on the old and new radio links based on the received signal quality of the old and new, namely, said UE selects radio links of strong signals to demodulate and decode the down-line signals and selects signals on the up-line to emit up-line signals, in which, the system applies independent power control loop maintaining the radio links from old to the new local area and TA or up-line synchronous control loop but not unified control.
Description
Technical field
The present invention relates to a kind of wireless communication system with the method for switching frequently, relate in particular to the method that a kind of time division duplex Wideband Code Division Multiple Access (WCDMA) (TDD WCDMA) system same frequency switches.
Background technology
In 3-G (Generation Three mobile communication system), the 3GPP of standardization body (third generation partner plan) is responsible to define the standard of WCDMA (Wideband Code Division Multiple Access (WCDMA)), WCDMA is divided into FDD (Frequency Division Duplexing (FDD)) and two kinds of patterns of TDD (time division duplex), and TDD is further divided into HCR (high spreading rate) and two kinds of options of LCR (low spreading rate) again.TDD HCR option is called UTRA TDD (universal terrestrial radio access time division duplex) again, and TDD LCR option is called TD-SCDMA again.
When UE (subscriber equipment) moves to another sub-district from a sub-district,, need to carry out handoff procedure in order to ensure keeping the connection of UTRAN (universal mobile telecommunications system land radio access web) to UE.Switch and be divided into direct-cut operation and soft handover.Direct-cut operation is meant that the Radio Link of being had been friends in the past in UE is all deleted before new Radio Link is set up.In realization, switch direct-cut operation always between frequency.With switching frequently can be direct-cut operation, also can be soft handover.No matter soft handover is meant Radio Link increases or reduce, always UE maintains a wireless links at least to UTRAN.Soft handover is to carry out by the mode of grand diversity, and grand diversity is meant at synchronization has multi wireless links to activate.Usually, soft handover is used to be operated in the cell change of identical frequency.
Soft handover has been adopted in the switching of FDD WCDMA system same frequency.Because the sign indicating number resource-constrained of the identical time slot of TDD WCDMA system, according to traditional soft handover method, for up link, two (perhaps many) links that participate in soft handover need take identical time slot, system can't guarantee that this condition can be met, so the switching of TDD WCDMA system same frequency has only defined direct-cut operation.Because the existence of co-channel interference, low with the success rate of frequency direct-cut operation, in the TDD of identical networking WCDMA system, this problem is more serious.In order to improve TDDWCDMA system same frequency success rate for switching, be necessary the same frequency switching that defines in the existing TDD WCDMA standard is improved.
Summary of the invention
The technical problem to be solved in the present invention provides the method that a kind of improved TDD WCDMA system same frequency switches, to improve TDD WCDMA system same frequency success rate for switching.
According to the present invention, provide a kind of being used for to realize together the method for switching frequently in the time division duplex Wideband Code Division Multiple Access (WCDMA) communication system, wherein, when the same frequency switch decision of radio network controller (RNC) is triggered, the maintenance user equipment (UE) is connected with old sub-district, RNC decision simultaneously is increased to the Radio Link of new sub-district for this UE, and UE is according to the signal quality of old sub-district that receives and new sub-district, carry out on old Radio Link and new Radio Link simultaneously that selectivity receives and selectivity is launched, wherein, described method adopts the power control loop road of this UE of independent maintenance to the Radio Link of old sub-district and new sub-district, emission in advance or the mode of uplink synchronous control loop, rather than unified control.
Preferably, described method further may further comprise the steps: RNC is reported to the signal quality decision of this sub-district and neighbor cell whether to be increased to the Radio Link of new sub-district for this UE according to UE; RNC notifies the Node B under the new sub-district to set up downward special physical channel DPCH and up DPCH for this UE; And this UE selects the strong down link of signal to carry out the demodulating and decoding downstream signal, and selects a up link to come transmit uplink signal on new and old up link.
Preferably, the time slot that the new descending DPCH that sets up in new sub-district takies can be identical or different with the shared time slot of the descending DPCH in old sub-district, and the shared time slot of the time slot that takies of the new up DPCH that sets up in new sub-district and the up DPCH in old sub-district is identical or different.
Preferably, described UE is selecting a up link to come the principle of transmit uplink signal to be on the new and old up link: transmit uplink signal on the good up link of corresponding downstream received signal quality; On the up link of corresponding downstream received signal quality difference, if descending power control requirement is arranged, and under the shared time slot of this up link and the situation of not conflicting at the shared time slot of the good up link of corresponding downstream received signal quality, also emission special physical controlling channel of upward DPCCH signal on this up link.
Preferably, described signal quality is signal to noise ratio, path loss, signal strength signal intensity.
Preferably, described method further comprises: by the step of RNC to UE transmission " activating set updating " message, wherein " activating set updating " message comprises information element " Radio Link increase information ", the Radio Link that indication UE need increase.
Preferably, UE adjusts UE to the emission lead of each sub-district, adjust UE to the transmitting power of each sub-district or adjust the uplink synchronous that UE arrives each sub-district according to the simultaneous bias that receives and be offset according to the transmitting power control that receives in advance according to the emission that receives.
Preferably, described method is applied to the TDD WCDMA system of synchronization among base stations.
After adopting the method for TDD WCDMA system same frequency switching provided by the invention, UE can exist multi wireless links to UTRAN simultaneously, has improved with the frequency success rate for switching.The TDD WCDMA system that is particularly useful for synchronization among base stations with the method for switching frequently provided by the invention.
Description of drawings
From the description of the following preferred embodiment of the present invention that mode with non-limitative example is provided and from appended drawings, can clear more these and other characteristics of the present invention, advantage and beneficial effect, wherein:
Fig. 1 represents the flow chart illustration that existing TDD WCDMA system same frequency switches.
Fig. 2 represents the flow chart illustration according to TDD WCDMA system same frequency switching of the present invention.
Fig. 3 represents that TDD WCDMA system same frequency according to the present invention switches in the system construction drawing that the while selectivity transmits and receives on a plurality of Radio Links.
Embodiment
Below in conjunction with the drawings; preferred implementation of the present invention is described; should be appreciated that; here the preferred implementation of Miao Shuing not is restrictive explanation; those skilled in the art can be according to principle of the present invention, the present invention is made various modifications, improvement and can not break away from the protection range that claim limits of enclosing.
The technical problem to be solved in the present invention provides the method that a kind of improved TDD WCDMA system same frequency switches, to improve TDD WCDMA system same frequency success rate for switching.
In order to solve the problems of the technologies described above, technical scheme of the present invention is: when the same frequency switch decision of RNC (radio network controller) was triggered, maintenance UE was connected with old sub-district, and RNC decision simultaneously is increased to the Radio Link of new sub-district for this UE.Wherein, RNC is reported to the signal quality decision of this sub-district and neighbor cell whether to be increased to the Radio Link of new sub-district for this UE according to UE, and described signal quality for example can be signal to noise ratio, path loss, signal strength signal intensity etc.; RNC notifies the Node B (Node B) under the new sub-district to set up descending DPCH (DPCH) and up DPCH for this UE, wherein the time slot that takies of the new descending DPCH that sets up in new sub-district and up DPCH can be identical with time slot shared in the cell-of-origin, also can be different; The Radio Link that RNC notifies this UE to be increased to new sub-district, the described Radio Link that increases newly are newly-established uplink and downlink DPCH.This UE does selectivity reception and selectivity emission according to the signal quality of old sub-district that receives and new sub-district, that is, this UE selects the strong Radio Link of signal to carry out the demodulating and decoding downstream signal, and selects transmit uplink signal on up link; System adopts this UE of independent maintenance to the power control loop road of the Radio Link of old sub-district and new sub-district and the mode of TA (emission in advance) or uplink synchronous control loop, rather than unified control.
This UE is selecting the principle of transmit uplink signal to be on the up link: transmit uplink signal on the good Radio Link of corresponding downstream received signal quality; On the Radio Link of corresponding downstream received signal quality difference, if descending power control requirement is arranged, and under the shared time slot of this Radio Link and the situation of not conflicting at the shared time slot of the good Radio Link of corresponding downstream received signal quality, also emission up DPCCH (Dedicated Physical Control Channel) signal on this Radio Link.
After adopting the method for TDD WCDMA system same frequency switching provided by the invention, can there be the multi wireless links of UTRAN simultaneously in UE, has improved with the frequency success rate for switching.The TDDWCDMA system that is particularly useful for synchronization among base stations with the method for switching frequently provided by the invention.
Fig. 1 is the flow chart illustration that TDD WCDMA system same frequency of the prior art switches.The process prescription that existing TDD WCDMA system same frequency switches is as follows:
Whether the RNC judgement needs to carry out with switching (step S101) frequently;
When the RNC judgement needed execution to switch with frequency, the Node B of RNC under new sub-district sent " Radio Link is set up and asked " and sets up Radio Link (step S103) with request;
Node B under the new sub-district begins to transmit and receive (step S105) on newly-established Radio Link;
At " Radio Link is set up request " that RNC sent, the Node B under the new sub-district sends " Radio Link is set up response " (step S107) to RNC;
RNC sends " physical channel reprovision " message (step S109) to UE, wherein the new employed Radio Resource of Radio Link of this physical channel reallocation message indication;
UE stops at and receives on the old Radio Link and begin to receive (step S110) on new Radio Link;
As affirmation, UE sends " the physical channel reprovision is finished " message (step S111) to RNC;
RNC terminates in and receives on the old Radio Link and launch, RNC Node B under former sub-district sends " Radio Link discharges request " (step S113), and correspondingly, Node B sends " Radio Link discharges response " (step S115) to RNC under the former sub-district.
Fig. 2 is the flow chart illustration of switching according to TDD WCDMA system same frequency of the present invention.The process prescription that TDD WCDMA system same frequency of the present invention switches is as follows:
Whether the RNC judgement needs to carry out with switching (step S201) frequently;
When the RNC judgement needed execution to switch with frequency, the Node B of RNC under new sub-district sent " Radio Link is set up and asked " and sets up Radio Link (step S203) with request;
Node B under the new sub-district begins to transmit and receive (step S205) on newly-established Radio Link;
Correspondingly, " Radio Link is set up request information, and the Node B under the new sub-district sends " Radio Link is set up response " (step S207) to RNC at RNC sent;
RNC sends " activating set updating " message (step S209) to UE, and wherein, activating set updating message has and message structure like the activating set updating classes of messages that has now in the FDD WCDMA system.Exist between sub-district in the Active Set and the UE to switch and be connected.The activating set updating process is used to upgrade the Active Set that is connected between UE and the UTRAN." activating set updating " message comprises information element " Radio Link increase information ", the Radio Link that indication UE need increase.
UE sends " activating set updating is finished " message (step S211) to RNC;
UE carries out on old Radio Link and new Radio Link simultaneously that selectivity receives and emission (step S213).That is, this UE selects the strong Radio Link of signal to carry out the demodulating and decoding downstream signal, and selects transmit uplink signal on up link.
Fig. 3 is that TDD WCDMA system same frequency of the present invention switches in and carries out the system construction drawing that selectivity transmits and receives on a plurality of Radio Links simultaneously.Sub-district #1 and sub-district #2 are to UE transmitting downstream data.For the HCR option, RNC sends TA#1 by sub-district #1 to UE on top signaling, and RNC sends TA#2 by sub-district #2 to UE on top signaling.For the LCR option, sub-district #1 sends up TPC (transmitting power control) #1 and SS (simultaneous bias) #1 to UE, and sub-district #2 sends up TPC#2 and SS#2 to UE.UE does selectivity and receives according to sub-district #1 that receives and the signal quality of sub-district #2.UE adjusts emission lead, the transmitting power of UE to sub-district #1 and sub-district #2 respectively according to TA, the TPC or the SS that receive, perhaps uplink synchronous skew.
UE is selecting the principle of transmit uplink signal to be on the up link: transmit uplink signal on the good Radio Link of corresponding downstream received signal quality; On the Radio Link of corresponding downstream received signal quality difference, if descending power control requirement is arranged, and under the shared time slot of this Radio Link and the situation of not conflicting at the shared time slot of the good Radio Link of corresponding downstream received signal quality, also emission up DPCCH (Dedicated Physical Control Channel) signal on this Radio Link.Be accompanied by data, UE to sub-district #1 transmitting downstream TPC#1, to sub-district #2 transmitting downstream TPC#2, is respectively applied for the descending power control of sub-district #1 and sub-district #2 on up DPCCH.
The switching mode of frequency together of the present invention is different from traditional soft handover.Traditional soft handover, the reception of UE is not optionally with emission, but receives the downlink data of Node B simultaneously in the identical moment, and data are merged; And identical moment simultaneously to Node B emission upstream data.
Below in conjunction with the drawings TDD WCDMA system same frequency changing method according to the present invention is set forth, but the present invention is not limited to this.One skilled in the art will appreciate that according to the principle of the invention, can make various modifications, improvement, and do not break away from the enclose scope of claim of the present invention the present invention.
Claims (8)
1, a kind of being used for realizes it is characterized in that with the method for frequency switching in the time division duplex Wideband Code Division Multiple Access (WCDMA) communication system,
When the same frequency switch decision of radio network controller (RNC) was triggered, the maintenance user equipment (UE) was connected with old sub-district, and RNC determines to be increased to for this UE the Radio Link of new sub-district simultaneously, and
UE is according to the signal quality of the old sub-district that receives and new sub-district, carries out on old Radio Link and new Radio Link simultaneously that selectivity receives and selectivity is launched;
Wherein, described this UE of method employing independent maintenance is to old sub-district and power control loop road, the emission of the Radio Link of sub-district newly shifts to an earlier date or the mode of uplink synchronous control loop, rather than unified control.
2, method according to claim 1, wherein, described method further may further comprise the steps:
RNC is reported to the signal quality decision of this sub-district and neighbor cell whether to be increased to the Radio Link of new sub-district for this UE according to UE;
RNC notifies the Node B under the new sub-district to set up downward special physical channel DPCH and up DPCH for this UE; And
This UE selects the strong down link of signal to carry out the demodulating and decoding downstream signal, and selects a up link to come transmit uplink signal on new and old up link.
3, method according to claim 2, wherein, the shared time slot of the time slot that the new descending DPCH that sets up in new sub-district takies and the descending DPCH in old sub-district is identical or different, and the shared time slot of the time slot that takies of the new up DPCH that sets up in new sub-district and the up DPCH in old sub-district is identical or different.
4, method according to claim 2, wherein, described UE is selecting a up link to come the principle of transmit uplink signal to be on the new and old up link: transmit uplink signal on the good up link of corresponding downstream received signal quality; On the up link of corresponding downstream received signal quality difference, if descending power control requirement is arranged, and under the shared time slot of this up link and the situation of not conflicting at the shared time slot of the good up link of corresponding downstream received signal quality, also transmit uplink signal on this up link.
5, method according to claim 2, wherein, described signal quality is signal to noise ratio, path loss, signal strength signal intensity.
6, method according to claim 2 further comprises: by the step of RNC to UE transmission " activating set updating " message, wherein " activating set updating " message comprises information element " Radio Link increase information ", the Radio Link that indication UE need increase.
7, method according to claim 1, wherein, UE adjusts UE to the emission lead of each sub-district, adjust UE to the transmitting power of each sub-district or adjust the uplink synchronous that UE arrives each sub-district according to the simultaneous bias that receives and be offset according to the transmitting power control that receives in advance according to the emission that receives.
8, method according to claim 1, wherein, described method is applied to the TDD WCDMA system of synchronization among base stations.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100016279A CN100473209C (en) | 2007-01-09 | 2007-01-09 | Method of TDD WCDMA system shared channel switch |
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| CNB2007100016279A CN100473209C (en) | 2007-01-09 | 2007-01-09 | Method of TDD WCDMA system shared channel switch |
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| CN100473209C true CN100473209C (en) | 2009-03-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101128064B (en) * | 2007-09-24 | 2012-01-11 | 中兴通讯股份有限公司 | Wireless link switching method in wireless communication system |
| CN104581854B (en) * | 2013-10-16 | 2019-07-12 | 中兴通讯股份有限公司 | A kind of wireless connection method and device |
| WO2015192378A1 (en) * | 2014-06-20 | 2015-12-23 | 华为技术有限公司 | Transmission power control command word generation method, device and system |
| CN110324835B (en) * | 2018-03-28 | 2023-05-09 | 北京小米松果电子有限公司 | Cell soft handover event filtering method and device, storage medium, base station and terminal |
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| CN1442970A (en) * | 2002-03-05 | 2003-09-17 | 华为技术有限公司 | Method of optimizing soft cut over between radio network controllers |
| CN1614916A (en) * | 2003-11-03 | 2005-05-11 | 华为技术有限公司 | Soft switching method |
| US6944142B2 (en) * | 2003-05-13 | 2005-09-13 | Interdigital Technology Corporation | Method for soft and softer handover in time division duplex code division multiple access (TDD-CDMA) networks |
| EP1612986A1 (en) * | 2003-09-04 | 2006-01-04 | The Doshisha | Radio communication system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1442970A (en) * | 2002-03-05 | 2003-09-17 | 华为技术有限公司 | Method of optimizing soft cut over between radio network controllers |
| US6944142B2 (en) * | 2003-05-13 | 2005-09-13 | Interdigital Technology Corporation | Method for soft and softer handover in time division duplex code division multiple access (TDD-CDMA) networks |
| EP1612986A1 (en) * | 2003-09-04 | 2006-01-04 | The Doshisha | Radio communication system |
| CN1614916A (en) * | 2003-11-03 | 2005-05-11 | 华为技术有限公司 | Soft switching method |
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