CN101174885A - Accidental access device of Time Division-Synchronous Code Division Multiple Access system - Google Patents
Accidental access device of Time Division-Synchronous Code Division Multiple Access system Download PDFInfo
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- CN101174885A CN101174885A CNA2006101380200A CN200610138020A CN101174885A CN 101174885 A CN101174885 A CN 101174885A CN A2006101380200 A CNA2006101380200 A CN A2006101380200A CN 200610138020 A CN200610138020 A CN 200610138020A CN 101174885 A CN101174885 A CN 101174885A
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Abstract
The present invention discloses a random access device of time division synchronous code division multiple access system which is based on distributed antennae; the device comprises a relevant result sequence acquisition part which is used for obtaining corresponding result sequence on every antenna unit of the base station of the time division synchronous code division multiple access system implements relevant operations on received random access signal and uplink synchronous code; a relevant result sequence processing part which is used for processing the relevant result sequence obtained by every antenna unit to judge whether the user device which uses the uplink synchronous code for uplink access exists on every antenna unit; and a downlink forward-link physical access channel arrangement part which is used for arranging the downlink forward-link physical access channel for the uplink synchronous code according to the judging result of the relevant result sequence processing part. With the technical proposal, at least two of the following beneficial effects are realized that the probability of system access conflict is reduced and the success rate of system access is increased.
Description
Technical field
The present invention relates to a kind of wireless communication technology technology, and especially, the accidental access device that relates to a kind of TD-SCDMA system (TD-SCDMA, TimeDivision-Synchronous Code Division Multiple Access) based on spaced antenna.
Background technology
The uplink synchronous process of being initiated by subscriber equipment in the TD-SCDMA system following (referring to Fig. 1): 1. each user terminal sends the specific up access signal that comprises uplink random synchronous code (SYNC_UL) in up link; 2. the base station obtains the up timing information of each user terminal by the detection to each uplink synchronous accidental access signal, and the base station is transmitted timing adjustment information by specific down channel (FPACH, forward physical access channel) to each user terminal again; 3. the information that issues according to the base station of each user is adjusted own timing, goes up access at specific access channel (RACH).
In the conventional TD-SCDMA sub-district of using smart antenna, if two or more user has selected same pseudo random sequence code and same base station to insert simultaneously in same frame, the conflict in the time of will causing the user to insert at random.Under above-mentioned conflict situations, if the normal user terminal that clashes of responding in base station, then conflicting can continue this conflict between user and the base station always, and the signaling access procedure of meeting EVAC (Evacuation Network Computer Model) causes the decline of whole system access performance.
Existing TD-SCDMA always wishes the base station to detect the situation that there is conflict in a plurality of user terminals, and a plurality of users that make conflict when conflict takes place reselect the uplink synchronous code delay and send out, to dissolve up access interference, the whole access effect of assurance system, in the macro base station environment, the bigger probability of up access signal of the subscriber equipment of conflict has tangible difference in time, thereby provides possibility to the detection of up conflict.
The occasion that has Microcell for indoor environment etc. in a large number, in order to reach the covering purpose, intensive outfit is not a good solution based on the base station equipment of smart antenna, exist and switch, cost, many-sided problem such as performance, at present at these problems, the TD-SCDMA base station that the use spaced antenna occurred replaces the equipment of a plurality of little base stations, this base station based on spaced antenna links to each other with a plurality of antenna elements (antenna element may comprise one or several antennas), one or several antenna elements are responsible for covering the scope that original little base station need cover, and the isolation of building is generally arranged between the antenna element.Mobile communication system applied scene when floor covers that TD-SCDMA base station based on spaced antenna replaces a plurality of Microcells to communicate by letter with a plurality of UE shown in Fig. 2, each antenna channels covers different floors among the figure, isolates by floor between the antenna element.
For the TD-SCDMA base station equipment based on spaced antenna, conventional access and conflict processing method will be no longer suitable.With the TD-SCDMA base station applies based on spaced antenna is example when floor covers, different element antennas is covered with different floors, though the subscriber equipment of different floors still belongs to a sub-district, but each subscriber equipment may be communicated by letter with base station equipment by different antenna elements at different floors, if the subscriber equipment of different floors has selected same pseudo random sequence code and base station to insert in same frame, the problem that the base station uses conventional access and conflict processing method to have two aspects at least: (1) base station is difficult to judge user's access interference again, the zone that utilizes distributed antenna element to cover does not generally have very big areal extent, the distance of each antenna element and affiliated subscriber equipment is roughly suitable, the environmental quality at each subscriber equipment place is also roughly the same, signal characteristic that the subscriber equipment of the detected several different floors in base station inserts with same pseudo random sequence code and base station in same frame and the generally not significantly difference of signal characteristic of having only a user to insert at a certain antenna element; (2) " subscriber equipment of different floors has selected same pseudo random sequence code to insert with the base station in same frame " though the uplink synchronous code of this situation conflict, but descending FPACH is owing to issue by different antenna elements, therefore in fact not conflict, base station are sought unity of action to such user and are reselected the chance that in fact processing that the uplink synchronous code delay sends out has again wasted user's up access.
By foregoing as can be seen, the access effect of existing TD-SCDMA base station based on spaced antenna is relatively poor, and the probability of system's access interference is bigger, and inserts success rate, not high, therefore, needs a kind of technical scheme that addresses the above problem.
Summary of the invention
Main purpose of the present invention is to provide the accidental access device of a kind of TD-SCDMA system (TD-SCDMA), and it can increase the access effect based on the TD-SCDMA base station of spaced antenna.
To achieve these goals, the invention provides a kind of accidental access device of the TD-SCDMA system based on spaced antenna.
This device comprises: correlated results sequence acquisition unit on each antenna element of TD-SCDMA system base station, obtains corresponding correlated results sequence by the accidental access signal that receives is carried out associative operation with a uplink synchronous code; Correlated results series processing portion is used for the correlated results sequence that is obtained by correlated results sequence acquisition unit is handled, to judge whether there is the subscriber equipment that uses uplink synchronous code to carry out up access on each antenna element; And descending forward physical channels arrangement portion, be used for uplink synchronous code being arranged descending forward physical access channel according to the judged result of correlated results series processing portion.
Wherein, the accidental access signal that correlated results sequence acquisition unit operates on it is the accidental access signal that comprises the user terminal of uplink synchronous code, and uplink synchronous code is included in the local up access signal code character.
Especially, do not have the subscriber equipment that uses uplink synchronous code to carry out up access on all antenna elements if correlated results series processing portion is judged, then descending forward physical access channel scheduling portion does not arrange descending forward physical access channel to uplink synchronous code; If judging to have only, correlated results series processing portion has the subscriber equipment that uses uplink synchronous code to carry out up access on the antenna element, then descending forward physical access channel scheduling portion arranges descending forward physical access channel to uplink synchronous code, and only issues the forward physical access channel at this antenna element; If judging to have, correlated results series processing portion all has the subscriber equipment that uses uplink synchronous code to carry out up access on a plurality of antenna elements, then descending forward physical access channel scheduling portion arranges descending forward physical access channel to uplink synchronous code, and issues the forward physical access channel at the strongest antenna element of the received power of uplink synchronous code.
In aforesaid operations, correlated results sequence the strongest antenna element of selective reception power from a plurality of antenna elements of each antenna element that descending forward physical access channel scheduling portion obtains according to correlated results sequence acquisition unit, more particularly, descending forward physical access channel scheduling portion comes the strongest antenna element of selective reception power according to the correlation peak effective value in the correlated results sequence of a plurality of antenna elements and/or effective average of comprising in the 2-8chip interval of correlation peak.
Pass through technique scheme, the present invention has realized following beneficial effect: judge the detection finished conflict and evade by antenna, the user who initiates to insert on different antenna elements has avoided owing to conflict causes the waste that inserts chance, reduce the probability of system's access interference, improved the success rate that inserts on the whole.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram that illustrates according to the uplink synchronous process of being initiated by subscriber equipment in the TD-SCDMA system of correlation technique;
Fig. 2 is the schematic diagram based on the TD-SCDMA base station of spaced antenna that illustrates according to correlation technique;
Fig. 3 is the flow chart based on the accidental access method of the TD-SCDMA system of spaced antenna according to the embodiment of the invention; And
Fig. 4 is the block diagram based on the accidental access device of the TD-SCDMA system of spaced antenna according to the embodiment of the invention.
Embodiment
Describe the present invention below with reference to the accompanying drawings in detail.
As shown in Figure 3, the method for describing in embodiments of the present invention may further comprise the steps:
Step S302 on each antenna element of TD-SCDMA system (TD-SCDMA) base station, obtains corresponding correlated results sequence by the accidental access signal that receives is carried out associative operation with a uplink synchronous code S; Wherein, accidental access signal is the accidental access signal that comprises the user terminal of uplink synchronous code, and uplink synchronous code S (can be any one in 8) is included in the local up access signal code character;
Step S304 handles the correlated results sequence that obtains on each antenna element, to judge whether there is the subscriber equipment that uses uplink synchronous code S to carry out up access on each antenna element in step S306;
And step S308, whether decision arranges descending FPACH (forward physical access channel) to uplink synchronous code S according to the judged result in step S306.
Particularly, step S308 comprises following operation:
On in step, judging all antenna elements, there be not when using the subscriber equipment that uplink synchronous code S carries out up access (, among the step S306 not), then proceed to step S308-2, uplink synchronous code S is not arranged FPACH;
When judgement in step S306 has only the subscriber equipment that existence use uplink synchronous code S carries out up access on the antenna element (, among the step S306-2 one), then proceed to step S308-4, uplink synchronous code S is arranged descending FPACH, and only issue FPACH at this antenna element;
Have when all having the subscriber equipment that use uplink synchronous code S carries out up access on a plurality of antenna elements when in step S306, judging (, a plurality of among the step S306-2), then proceed to step S308-6, uplink synchronous code S is arranged descending FPACH, and issue FPACH at the strongest antenna element of the received power of uplink synchronous code.
Especially, in above-mentioned steps S308-6, correlated results sequence the strongest antenna element of selective reception power from a plurality of antenna elements according to each antenna element that in step S302, obtains, more specifically, come the strongest antenna element of selective reception power according to the correlation peak effective value in the correlated results sequence of a plurality of antenna elements and/or effective average of comprising in the 2-8chip interval of correlation peak.
In addition, respectively all uplink synchronous codes (being 8 at present) in the up access signal code character of this locality are carried out above-mentioned each treatment step, until all uplink synchronous codes in the up access signal code character are all made the decision of whether arranging FPACH.
Describe the accidental access device based on the TD-SCDMA system of spaced antenna according to the embodiment of the invention hereinafter with reference to accompanying drawing 4, wherein, Fig. 4 is the block diagram that this apparatus structure is shown.
As shown in Figure 4, the accidental access device 400 of this TD-SCDMA system comprises: correlated results sequence acquisition unit 402, on each antenna element of TD-SCDMA system base station, by an accidental access signal and a uplink synchronous code (for example, uplink synchronous code S) that receives carried out the correlated results sequence that associative operation obtains correspondence; Correlated results series processing portion 404 is used for the correlated results sequence that is obtained by correlated results sequence acquisition unit 402 is handled, to judge whether there is the subscriber equipment that uses uplink synchronous code to carry out up access on each antenna element; And descending forward physical channels arrangement portion 406, be used for uplink synchronous code being arranged descending FPACH (forward physical access channel) according to the judged result of correlated results series processing portion 404.
Wherein, the accidental access signal that correlated results sequence acquisition unit 404 operates on it is the accidental access signal that comprises the user terminal of uplink synchronous code, and uplink synchronous code is included in the local up access signal code character.
Especially, do not have the subscriber equipment that uses uplink synchronous code to carry out up access on all antenna elements if correlated results series processing portion 404 is judged, 406 pairs of uplink synchronous codes of then descending forward physical access channel scheduling portion are not arranged descending forward physical access channel; If judging to have only, correlated results series processing portion 404 has the subscriber equipment that uses uplink synchronous code to carry out up access on the antenna element, 406 pairs of uplink synchronous codes of then descending forward physical access channel scheduling portion are arranged descending forward physical access channel, and only issue the forward physical access channel at this antenna element; If judging to have, correlated results series processing portion 404 all has the subscriber equipment that uses uplink synchronous code to carry out up access on a plurality of antenna elements, 406 pairs of uplink synchronous codes of then descending forward physical access channel scheduling portion are arranged descending forward physical access channel, and issue the forward physical access channel at the strongest antenna element of the received power of uplink synchronous code.
In aforesaid operations, correlated results sequence the strongest antenna element of selective reception power from a plurality of antenna elements of each antenna element that descending forward physical access channel scheduling portion 406 obtains according to correlated results sequence acquisition unit 402, more particularly, descending forward physical access channel scheduling portion 406 comes the strongest antenna element of selective reception power according to the correlation peak effective value in the correlated results sequence of a plurality of antenna elements and/or effective average of comprising in the 2-8chip interval of correlation peak.
By above description as can be seen, except the advantage of above having described, combine by the antenna judging process is handled with the emission of FPACH, guaranteed up access success rate and performance when the next user's of some environment up access signal is received simultaneously by two different antenna elements simultaneously.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the accidental access device of a TD-SCDMA system is characterized in that, comprising:
Correlated results sequence acquisition unit on each antenna element of TD-SCDMA system base station, obtains corresponding correlated results sequence by the accidental access signal that receives is carried out associative operation with a uplink synchronous code;
Correlated results series processing portion is used for the correlated results sequence that is obtained by described correlated results sequence acquisition unit is handled, to judge whether there is the subscriber equipment that uses described uplink synchronous code to carry out up access on each antenna element; And descending forward physical channels arrangement portion, be used for uplink synchronous code being arranged descending forward physical access channel according to the judged result of correlated results series processing portion.
2. the accidental access device of TD-SCDMA system according to claim 1, it is characterized in that, the described accidental access signal that described correlated results sequence acquisition unit operates on it is the accidental access signal that comprises the user terminal of uplink synchronous code, and described uplink synchronous code is included in the local up access signal code character.
3. the accidental access device of TD-SCDMA system according to claim 1, it is characterized in that, do not have the subscriber equipment that uses described uplink synchronous code to carry out up access on all antenna elements if described correlated results series processing portion is judged, then described descending forward physical access channel scheduling portion does not arrange descending forward physical access channel to described uplink synchronous code.
4. the accidental access device of TD-SCDMA system according to claim 1, it is characterized in that, if judging to have only, described correlated results series processing portion has the subscriber equipment that uses described uplink synchronous code to carry out up access on the antenna element, then described descending forward physical access channel scheduling portion arranges descending forward physical access channel to described uplink synchronous code, and only issues the forward physical access channel at this antenna element.
5. the accidental access device of TD-SCDMA system according to claim 1, it is characterized in that, if described correlated results series processing portion is judged the subscriber equipment that all exists the described uplink synchronous code of use to carry out up access on a plurality of antenna elements is arranged, then described descending forward physical access channel scheduling portion arranges descending forward physical access channel to described uplink synchronous code, and issues the forward physical access channel at the strongest antenna element of the received power of described uplink synchronous code.
6. the accidental access device of TD-SCDMA system according to claim 5, it is characterized in that the strongest antenna element of described received power is selected according to the correlated results sequence of each antenna element that described correlated results sequence acquisition unit obtains by described descending forward physical access channel scheduling portion from described a plurality of antenna elements.
7. the accidental access device of TD-SCDMA system according to claim 6, it is characterized in that the strongest antenna element of described received power is selected according to the correlation peak effective value in the correlated results sequence of described a plurality of antenna elements and/or effective average of comprising in the 2-8chip interval of correlation peak by described descending forward physical access channel scheduling portion.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2006101380200A CN101174885A (en) | 2006-11-02 | 2006-11-02 | Accidental access device of Time Division-Synchronous Code Division Multiple Access system |
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| CNA2006101380200A CN101174885A (en) | 2006-11-02 | 2006-11-02 | Accidental access device of Time Division-Synchronous Code Division Multiple Access system |
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| CN101174885A true CN101174885A (en) | 2008-05-07 |
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| CNA2006101380200A Withdrawn CN101174885A (en) | 2006-11-02 | 2006-11-02 | Accidental access device of Time Division-Synchronous Code Division Multiple Access system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115378533A (en) * | 2021-05-20 | 2022-11-22 | 海能达通信股份有限公司 | Method, device and computer readable storage medium for improving frame synchronization rate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115378533A (en) * | 2021-05-20 | 2022-11-22 | 海能达通信股份有限公司 | Method, device and computer readable storage medium for improving frame synchronization rate |
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